CN102835188A - Apparatus for generating a drive signal for a lamp device and method for generating a drive signal for a lamp device - Google Patents
Apparatus for generating a drive signal for a lamp device and method for generating a drive signal for a lamp device Download PDFInfo
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- CN102835188A CN102835188A CN2011800180969A CN201180018096A CN102835188A CN 102835188 A CN102835188 A CN 102835188A CN 2011800180969 A CN2011800180969 A CN 2011800180969A CN 201180018096 A CN201180018096 A CN 201180018096A CN 102835188 A CN102835188 A CN 102835188A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
Abstract
An apparatus (100) for generating a drive signal (120) for a lamp device (110) comprises a pulse generator (130) for generating a first pulse train (140) in response to a first brightness request for a first brightness and for generating a second pulse train (160) in response to a second brightness request for a second brightness. The first pulse train (140) has a first frequency and the second pulse train (160) has a different second frequency. The second pulse train (160) comprises two neighboring pulses (142 a, 142 b) of the first pulse train (140) and comprises a further pulse (162 a) between the two neighboring pulses (142 a, 142 b), the further pulse (162 a) not being comprised in the first pulse train (140).
Description
Technical field
The present invention relates to produce the field of drive signal, relate to the field be used for such as the drive signal of the lamp device of LED spotlight that produces particularly.
Background technology
Realized brightness regulation through ON/OFF LED (light-emitting diode) apace such as the LED lighting device of LED spotlight (for example, having a plurality of LED).The state of opening and the ratio between the off status of LED are high more, and LED seems the bright more of photograph.If the frequency that switch switches is greater than 100Hz, then human eye can not be discerned beat (the switch switching) of LED.
For camera, particularly for new HDTV camera, this on/off switch of LED can have problems.Beating of LED causes and the aperture time of HDTV camera and the interference of refresh rate.This can discern through beating of magazine light.
The modulation signal of on/off switch that is used for LED is normally based on pulse width modulation (PWM).For LED is carried out light modulation, that is,, need high PWM ratio in order to adjust the brightness under the situation that does not have the visible jump in the lighting curve.Usually, use the ratio of 1:4096.This relates to the resolution of 12 bits.
If LED spotlight (for example, having a plurality of LED) will can be applicable to the for example modern TV camera of HDTV camera, then need make the PWM frequency high as far as possible.In addition, this PWM frequency should be the integral multiple of 50Hz and 60Hz, otherwise, can not use the LED spotlight in the world.As stated, under the situation of TV camera, refresh rate not only, aperture time also is important.The shutter that the aperture time of TV camera defines the TV camera is caught a picture and how long will be opened.If above-mentioned aperture time is very short, then need very high PWM frequency.The PWM frequency that has been found that 600Hz is just enough, but the PWM frequency of 1200Hz or 2400Hz provide lighting condition around do not beat and the situation of shake under the safe distance of acquisition picture.
Based on following equality, this provides the short pulse length t of the pwm signal that is used for LED or LED spotlight
On min:
t
On min=1/ (f
Camera* PWM-ratio)
=1/（2400Hz*4096）
t
on?min=0,1017us （1）
For the typical microcontroller of the typical instructions time with 100ns (corresponding to the frequency of 10Mz), the too short and pulse that can not export this length of this time.In addition, a microcontroller should be used to control a plurality of LED, to practice thrift cost and effort.Therefore, typical microcontroller can not be used to provide the signal of a plurality of LED of the LED that drives all above-mentioned requirements that satisfy modern HDTV camera or LED spotlight.A kind of possibility is to use high-accuracy Digital Signal Processing processor, but this will cause cost and effort sharply to increase.
Target of the present invention is to provide a kind of LED or LED spotlight that allows to drive the HDTV camera, but than prior art the driving signal generator that is used for LED or LED spotlight is required lower thought.
Summary of the invention
This target is according to the realization of getting off: according to the equipment of claim 1, according to the equipment of claim 12, according to the method for claim 19, according to the method for claim 20 and according to the computer program of claim 21.
Central idea of the present invention is; Second drive signal of first drive signal and second brightness that is used for the lamp device that is used for first brightness of lamp device is different on frequency; The umber of pulse of the drive signal that perhaps in other words, contains in the special time amount is different.Have been found that the frequency through changing drive signal changes brightness, rather than that kind of carrying out with PWM, holding frequency is constant and pulse length that change drive signal changes brightness, so can be so that the individual pulse of drive signal is longer than conventional P WM.Therefore, traditional microcontroller and especially low cost microcontroller can be used to produce the drive signal that is used for such as the lamp device of LED or LED spotlight.
Therefore; The invention has the advantages that; Regulate the brightness of lamp device through changing frequency; Rather than change pulse length and holding frequency constant, therefore can use known being used in the art technology to produce drive signal more cheap of lamp device or LED or LED spotlight and more simple device.
Execution modes more of the present invention provide the equipment of the drive signal that is used to produce the lamp device.This equipment comprises pulse generator, is used for producing first pulse train in response to the first brightness request to first brightness, and produces second pulse train in response to the second brightness request to second brightness.First pulse train has first frequency and second pulse train has second frequency, and wherein, first frequency is different from second frequency.Second pulse train comprises two adjacent pulses of first pulse train and other pulses between two adjacent pulses, and other pulses are not included in first pulse train.
According to some execution modes, pulse generator can be configured to produce first pulse train and second pulse train, makes that the pulse length of two adjacent pulses and other pulses is identical.In other words, pulse generator can be configured to change through the pulse of adding or remove equidistant length the brightness of lamp device.In conventional P WM system, the frequency of drive signal is constant, but realizes recently that through the ON/OFF that changes pulse brightness changes.In other words, in conventional P WM system, the different driving signal that is used for brightness in various degree only the ON/OFF of pulse than different (so pulse length is different), rather than the frequency of drive signal difference itself.
According to some execution modes, for example, if pulse provides the current impulse to the lamp device, then second brightness can be brighter than first brightness.
According to some other execution modes, this equipment may further include brightness request generator, and it is configured to the input of pulse generator at least the first brightness request and the second brightness request are provided.For example, pulse generator can receive the first brightness request and the second brightness request at input, and for example can have the drive signal of respective pulses string according to the output of internal searching table.
Description of drawings
Below will execution mode of the present invention be described in more detail with reference to accompanying drawing, wherein:
Fig. 1 a shows the equipment that is couple to the lamp device according to embodiment of the present invention;
Fig. 1 b shows two diagrammatic sketch by the pulse train of the pulse generator generation of the equipment shown in Fig. 1 a;
Fig. 2 shows two pulse trains shown in Fig. 1 b and the diagrammatic sketch of corresponding pwm signal;
Fig. 3 a shows the block diagram according to the equipment that is couple to the lamp device of embodiment of the present invention;
Fig. 3 b shows two diagrammatic sketch by the pulse train of the pulse generator generation of the equipment shown in Fig. 3 a;
Fig. 4 shows two pulse trains shown in Fig. 3 b and the diagrammatic sketch of corresponding pwm signal;
Fig. 5 shows the equipment that is couple to the lamp device according to embodiment of the present invention;
Fig. 6 a to Fig. 6 d shows the diagrammatic sketch of the pulse train that is produced by the pulse generator according to the equipment of embodiment of the present invention;
Fig. 7 shows the flow chart according to the method for embodiment of the present invention; And
Fig. 8 shows the flow chart according to the method for embodiment of the present invention.
Embodiment
Following illustrate in greater detail execution mode of the present invention based on accompanying drawing before, it may be noted that in the accompanying drawings the element that equates on the identical or function is endowed identical reference number, and will omit being repeated in this description of these elements.Therefore, the description that has an element of same reference numerals be can exchange each other and/or can be used for each execution mode.
Hereinafter, pulse length also is called the time lengthening of burst length or pulse.
Fig. 1 a shows the block diagram according to the equipment that is couple to lamp device 110 100 of embodiment of the present invention.The equipment 100 that is used to produce the drive signal 120 of lamp device 110 comprises pulse generator 130.Pulse generator 130 is configured to produce first pulse train 140 (shown in Fig. 1 b) and produces second pulse train 160 (shown in Fig. 1 b).First pulse train 140 and second pulse train 160 can provide and can be used as the Continuous Flow of creating drive signal 120 at the output 180 of equipment 100; Wherein, will cause being different from another brightness based on the drive signal 120 of first pulse train 140 based on the lamp device 110 of the drive signal 120 of second pulse train 160.Pulse generator 130 is configured to produce first pulse train 140 in response to the first brightness request to first brightness, and produces second pulse train 160 in response to the second brightness request to second brightness.The frequency of first pulse train 140 is f
140, it is different from the frequency f of second pulse train 160
160Therefore, first brightness can be different from second brightness, and for example, first brightness can be higher than second brightness.
Fig. 1 b shows signal Figure 150 of first pulse train 140 and signal Figure 170 of second pulse train 160.First pulse train 140 comprises the first pulse 142a and the second pulse 142b at least.The first pulse 142a and the second pulse 142b are adjacent pulses, this means that the second pulse 142b follows the first pulse 142a in real time, and between these two adjacent pulse 142a, 142b, other pulses are not set.Therefore, the cycle of pulse train 140 can be the time t between the first pulse 142a and the second pulse 142b
140Frequency f then
140Can be f
140=1/t
140
According to some execution modes, the pulse length t of two adjacent pulse 142a, 142b and other pulses 162a
PulseCan be identical.In addition, very first time t
140With the second time t
160Can be pulse length t
PulseMultiple.
According to some execution modes, shown in Fig. 1 b, the time span of the time span of first pulse train 140 and second pulse train 160 can be identical.In Fig. 1 b, the time span of first pulse train 140 is very first time t
140, the time span of second pulse train 160 is second time t
160Twice, wherein, the second time t
160Be very first time t
140Half the.
According to other execution mode, drive signal 120 can comprise a plurality of first pulse trains 140 or second pulse train 160.For first brightness, drive signal 120 will be the Continuous Flow of pulse train 140 for example, and for second brightness, drive signal 120 will be the Continuous Flow of pulse train 160.In the drive signal 120 based on first pulse train 140, the time between two rising edges of two last pulses successively of time will be very first time t
140In the drive signal 120 based on second pulse train 160, the time between two rising edges of two last pulses successively of time will be the second time t
160
According to other execution mode, pulse train follow-up after two rising edges of pulse between time can in pulse train, change, therefore different follow-up for pulse train at afterpulse, the time between two rising edges of the pulse of pulse train can difference.
According to other execution mode, pulse generator 130 can further be configured to produce a plurality of pulse trains in response to a plurality of different brightness requests, makes pulse train in a plurality of pulse trains corresponding to the brightness request in a plurality of brightness requests.Different pulse strings can differ from one another on the umber of pulse that they comprise.As stated, the time span of different pulse trains can be identical for all pulse trains.
According to other execution mode, pulse series generator 130 can comprise microcontroller, and it is configured at output or a plurality of output drive signal 120 or a plurality of drive signal 120 are provided.The output of microcontroller can be micro controller I/O pin for example.Micro controller I/O pin is through directly being connected to lamp device 110 the I/O pin or being couple to lamp device 110 by means of the lamp device driver (it provides drive current for lamp device 110) between I/O pin and the lamp device 110.
According to other execution mode, lamp device 110 can comprise LED or a plurality of LED or any other illuminating devices.Therefore the lamp device 110 that comprises a plurality of illuminating devices or LED can comprise a plurality of inputs that are used for a plurality of drive signals 120, makes the different LED of lamp device 110 or the brightness level of illuminating device to differ from one another.Particularly, the different LED of lamp device 110 or illuminating device can comprise different colours, for example, and the LED of red LED or illuminating device, green or illuminating device and blue LED or illuminating device.In other words, lamp device 110 can be a RGB lamp device.
Fig. 2 shows the signal Figure 150 of first pulse train 140 among Fig. 1 and the sketch map 210 of corresponding pwm signal 220.In addition, Fig. 2 shows the signal Figure 170 of second pulse train 160 among Fig. 1 b and the sketch map 230 of corresponding pwm signal 240.Because given interval (for example, time interval t
140) in the pulse duration sum of pulse of first pwm signal 220 equal the pulse duration sum of the pulse of first pulse train 140 in this given interval, therefore first pwm signal 220 is corresponding to first pulse train 140.Similarly; Because the pulse duration sum of the pulse of second pwm signal 240 in the given interval equals the pulse duration sum of the pulse of second pulse train 160 in this given interval, therefore second pwm signal 240 is corresponding to second pulse train 160.In other words, when drive signal 120 during based on first pulse train 140 or the first pulse pwm signal 220, at time interval t
140First quantity that flows into the electric charge carrier in the lamp device 110 is identical, and when drive signal 120 during based on second pulse train 160 or the second pulse pwm signal 240, second quantity of the electric charge carrier in the inflow lamp device 110 is identical.Therefore, corresponding to first brightness of first pulse train 140 also corresponding to first pwm signal 220, corresponding to second brightness of second pulse train 160 also corresponding to second pwm signal 240.
At two adjacent pulse 142a of first pulse train 140 and t in the time interval between the 142b
140, first pwm signal 210 comprises four pulse 222a, 222b, 222c and 222d.Time interval t between two rising edges of the adjacent pulse of second pwm signal 220
PWMBe t
1401/4th (t
140/ 4).Therefore, the frequency f of first pwm signal 220
PWMIt is the frequency f of first pulse train 140
140Four times high.The weak point of conventional P WM is that for each brightness request, it is constant that the frequency of conventional P WM drive signal keeps.Therefore, need be significantly shorter than embodiment of the present invention the minimum pulse duration of pwm signal, and wherein, drive signal 120 frequencies of different brightness requests are different.In the embodiment shown in Fig. 2, the pulse length of the pulse 222a to 222d of first pwm signal 220 is the pulse 142a of first pulse train 140, the pulse length t of 142b
Pulse1/4th.Therefore, the pulse generator that produces second pwm signal 220 needs at least than the signal generator that produces first pulse train 140 130 fast four times.Particularly when the low-light level degree; Low frequency than first pulse train 140 of second pwm signal 220 is not a problem; This be because; The TV camera is only reacted with responsive mode to the low frequency of the pulse of lamp device 110 with higher brightness (for example, the high-high brightness of lamp device 110 half the).In embodiment of the present invention, through the brightness that the frequency that increases drive signal 120 increases lamp device 110, for example, when the TV camera was the most responsive to the pulse of lamp device 110, the frequency of drive signal 120 can be the highest.For example, the frequency of the drive signal 120 in the sensitizing range of TV camera can be identical with the frequency of corresponding pwm signal or even higher.
As stated, in embodiment of the present invention, the brightness that increases lamp device 110 through the frequency that increases drive signal 120.Therefore, the frequency f of second pulse train 160
160The frequency f that is higher than first pulse train 140
140, therefore, at the frequency ratio of the drive signal 120 of drive signal 120 during the height during based on first pulse train 140 based on second pulse train 160.In contrast to this, have the frequency f identical with second pulse train, 160 corresponding second pwm signals 240 with first pwm signal 220
PWMThis is the typical characteristics of conventional P WM signal, and wherein, the frequency of pwm signal will keep constant and can obtain the different brightness degree through the different pulse lengths of pwm signal.As stated, therefore, the weak point of these conventional P WM signal is, need the pulse length of the pulse of conventional P WM signal be remained much smaller than embodiment of the present invention, and wherein, different brightness level are corresponding to the different frequency of drive signal 120.
In Fig. 2, the hacures in the pulse have marked from the variation of first pulse train, 140 to second pulse trains 160 and from the variation of first pwm signal, 220 to second pwm signals 240.Through having other pulse 162a between two adjacent pulse 142a in second pulse train 160, the 142b, the electric charge carrier that flows into lamp device 110 during based on second pulse train 160 when drive signal 120 is many during based on first pulse train 140 than drive signal 120.In conventional P WM signal, the length of the pulse of pwm signal can prolong, to obtain to flow into the more multi-charge charge carrier of lamp device.This is shown in Fig. 2, and wherein, pulse 242a, 242b, 242c, the 242d of second pwm signal 240 is longer than pulse 222a, 222b, 222c, the 222d of first pwm signal 220.In the embodiment shown in Fig. 2, the pulse length of pulse 242a to 242d is pulse 142a, the 162a of second pulse train 160, the pulse length t of 142b
PulseHalf the.The pulse length t of the pulse of second pulse train 160
PulsePulse length t with the pulse of first pulse train 140
PulseEquate.Because the shorter duration of the pulse of second pwm signal 240, it is fast that the pulse generator of second pwm signal 240 (for example, microcontroller) still need be at least the twice of the pulse generator 130 that is used to produce second pulse train 160.
In order further to increase the brightness of lamp device 110, can between two adjacent pulse 142a, 142b, add other pulses, wherein, along with each increase of the brightness of lamp device 110, the frequency of drive signal 120 also will increase.Therefore, the drive signal 120 that is produced by pulse generator 130 can have identical or even the higher frequency of corresponding pwm signal with the same brightness of lamp device 110.Pulse generator 130 can be configured so that sensitivity when the TV camera that is used lamp device 110 about the pulse of lamp device 110 when the highest, and the frequency of drive signal 120 is the highest.Particularly, pulse generator 130 can be traditional microcontroller, and than being used for producing drive signal and the satisfied required pulse generator of demand that is used the TV camera of lamp device 110 based on conventional P WM signal, it has low relatively instruction cycle time.As can beappreciated from fig. 2, being used to produce the pulse generator 130 of first pulse train 140 and second pulse train 160 can be than slow four times of the pulse generator that is used to produce first pwm signal 220 and second pwm signal 240.Therefore, than the traditional pulse generator that is used to produce first pwm signal 220 and second pwm signal 240, pulse generator 130 is marked down a lot of and/or can be used to control a plurality of lamp devices 110.
Fig. 3 a shows the schematic block diagram of the equipment 300 of the drive signal 320 that is used to produce lamp device 110.Equipment 300 comprises pulse generator 330, is used for producing first pulse train 340 and producing second pulse train 360 in response to the second brightness request to second brightness in response to the first brightness request to first brightness.First pulse train 340 (shown in Fig. 3 b) has at least three independently pulses.Second pulse train 360 (shown in Fig. 3 b) has at least three independently pulses, wherein, said at least three independently the part in the pulse have equal length.At least one pulse during at least three independent veins of second pulse train 360 dash is dashed than the corresponding independent vein in first pulse train 340 has different length.
Pulse generator can for example be the microcontroller that is couple to (for example, directly connect lamp driver is perhaps arranged) lamp device 110 therebetween.According to brightness requirement, drive signal 320 can be based on the Continuous Flow of first pulse train 340 or the Continuous Flow of second pulse train 360.Can cause the different brightness of lamp device 110 with drive signal 320 based on second pulse train 360 based on the drive signal 320 of first pulse train 340.For example, the brightness of the lamp device 110 in the time will being applied to lamp device 110 based on the drive signal 320 of second pulse train 360 can be higher than or greater than drive signal 320 based on first pulse train 340 when being applied to the brightness of lamp device of lamp device 110.Therefore, second brightness can be higher than first brightness.
Fig. 3 b shows the sketch map 350 of first pulse train 340 and the sketch map 370 of second pulse train 360.First pulse train 340 comprises the first pulse 342a, the second pulse 342b and the 3rd pulse 342c.The time span t of the first pulse train 342a
342aBe the time span t of pulse 342b and pulse 342c
PulseTwice.Because first pulse train 340 does not comprise any pulse at three independent veins between two adjacent pulses of 342a, 342b, 342c, so these three independent veins are independent towards 342a, 342b, 342c.In other words; If these three independent veins are the electric currents that flows into lamp device 110 towards the amplitude of 342a, 342b, 342c; Then these three independent veins towards between 342a, 342b, the 342c (promptly; At three independent veins, one trailing edge and this three independent veins in 342a, 342b, the 342c on the time of 342a, 342b, 342c between the rising edge at afterpulse), then do not have electric current to flow in the lamp device 110.
According to other execution mode, time t
PulseCan be minimum maybe pulse length, wherein, the pulse length of all pulses of the pulse train that is produced by pulse generator 330 can be minimum pulse length t at least
PulseOr minimum pulse length t
PulseMultiple.
According to other execution mode, the pulse length of the pulse of pulse train can differ minimum pulse length t with the pulse length maximum of another pulse of same pulse train
Pulse
According to other execution mode, the time between two rising edges of the pulse of pulse train can be minimum pulse length t
PulseMultiple.
As in Fig. 3 b, finding out, through the pulse length of prolongation by the pulse of the pulse train of pulse generator 330 generations, the brightness that can use pulse generator 330 to obtain lamp devices 110 increases.Can be identical with the frequency of the corresponding different pulse trains of different brightness level of lamp device 110 for all pulse trains.
Fig. 4 shows the sketch map 350 of first pulse train 340 among Fig. 3 b and the sketch map 410 of corresponding first pwm signal 420.In addition, Fig. 4 b shows the sketch map 370 of second pulse train 160 among Fig. 3 b and the sketch map 430 of corresponding second pwm signal 440.Because the length sum of all pulses of first pulse train 340 is identical with the length sum of all pulses of first pwm signal 420, therefore first pwm signal 420 is corresponding to first pulse train 340.The brightness that in other words, will produce at lamp device 110 based on the drive signal 120 of first pulse train 340 is with identical based on the drive signal of first pwm signal 420.First pwm signal 420 comprises that three identical independent veins are towards 422a, 422b, 422c.The length of each pulse or time span are t
422, be pulse length t
Pulse1/3rd (t
Pulse/ 3).Time t between two succeeding impulses of first pwm signal 420
PWMAnd the time t between two succeeding impulses of first pulse train 340
340Identical.Therefore, the difference of first pwm signal 420 and first pulse train 340 is that all pulse 422a of first pwm signal 420,422b, 422c have equal length.
Similar with first pulse train 340 and first pwm signal 420; Owing to the brightness of the lamp device 110 that is produced by the drive signal 320 based on second pulse train 360 is identical with the brightness that is produced by the drive signal based on second pwm signal 440, therefore second pwm signal 440 is corresponding to second pulse train 360.As stated, the difference of second pulse train 360 and first pulse train 340 is pulse 362c, and its length is different with corresponding pulses 342c in first pulse train 340.In the embodiment shown in Fig. 4, than pulse 342c, pulse 362c has prolonged a pulse length t
PulseIn contrast to this, the difference of second pwm signal 440 and first pwm signal 420 is that all pulse 442a, 442b, 442c are longer than its corresponding pulses 422a, 422b, the 422c of first pwm signal 420.Hacures from diagrammatic sketch 430 can find out that it (is pulse length t that the pulse 442a of second pwm signal 440,442b, 442c have prolonged a time separately
Pulse1/3rd), make the length t of three pulse 442a, 442b, 442c
442 Be 4/3rds (t of pulse length
442=4/3*t
Pulse).
Than the traditional pulse generator that is used to produce first pwm signal 420 and second pwm signal 440; The advantage that is used to produce the pulse generator 330 of first pulse train 340 and second pulse train 360 is; Change for brightness; Only need length change certain hour interval (for example, pulse length t with a pulse of pulse train
Pulse), rather than time of all pulses of pulse train changed much little pulse length (t
Pulse/ 3).Therefore, can comprise traditional microcontroller according to the pulse generator 330 of embodiment of the present invention, it has than is used to the little a lot of instruction cycle time of the pulse generator that produces conventional P WM signal.Than the legacy equipment that drives the lamp device with conventional P WM signal, this has brought the remarkable cost of equipment 300 to reduce.
Though for two pulse trains 140 and 160; Pulse amplitude by the pulse train 140,160 that produces according to the pulse generator of Fig. 1 a 130 is identical; But in other execution mode, the pulse amplitude of first pulse train 140 can be different from the pulse amplitude of second pulse train 160.Therefore, second pulse train 160 that first pulse generator 130 produces and the different frequencies that not only are pulse train of first pulse train 140 also are the amplitude of the pulse of pulse train.For example, the amplitude of the pulse of first pulse train 140 can be less than the amplitude of the pulse of second pulse train 160.According to other execution modes, this also is applicable to first pulse train 340 and second pulse train 360 that is produced by the pulse generator 330 according to Fig. 3 a.Therefore, by the different pulse lengths that not only are pulse train of pulse generator 330 first pulse train 340 that produces and second pulse train 360 that produces by pulse generator 330, also be the amplitude of the pulse of pulse train.The amplitude of the pulse of first pulse train 340 that for example, is produced by pulse generator 330 can be less than the amplitude of the pulse of second pulse train 360 that is produced by pulse generator 330.
Fig. 5 shows the equipment that is couple to lamp device 110 500 according to embodiment of the present invention.Equipment 500 can be further comprise brightness request generator 530 according to the equipment 100 of Fig. 1 a or according to the equipment 300 of Fig. 3 a, this brightness request generator 530 is configured to provide the input of the pulse generator 530 of at least the first brightness request and second brightness request to the equipment 500.For example, pulse generator 530 can be pulse generator 130 or pulse generator 330.For example, brightness request generator 530 can comprise microcontroller or control unit.
Fig. 6 a for example shows the sketch map as the pulse train of the drive signal 120 of lamp device 110 that is produced by the pulse generator 130 according to Fig. 1.Fig. 6 a shows the different pulse trains (adding the diagrammatic sketch of value 0 of the off status of lamp device 110) of the different brightness level that are used for lamp device 110.The brightness that the corresponding pulse train of value representation in sketch map left side produces at lamp device 110, wherein, big more number is corresponding to the high brightness more of lamp device 110, and is worth 16 high-high brightness corresponding to lamp device 110.The frequency factor on the right side of sketch map is represented the frequency of corresponding pulse train, wherein, and the high-frequency more of high more value representation pulse train.For example, the value shown in second sketch map is that 1 pulse train for example can be first pulse train 140, and the value shown in second sketch map is that 2 pulse train for example can be second pulse train 160.Different pulse trains are only differing from one another aspect its umber of pulse that contains, and wherein, for each increase of brightness, all add a pulse, and it is represented with hacures.Therefore, along with each brightness increases, the frequency of drive signal 120 and pulse train all increases, up to reaching peak frequency.Realized peak frequency (is 8 in the sketch map intermediate value) in half of the brightness of lamp device 110, this is the brightness the most responsive to the pulse of lamp device 110 of TV camera.As stated, for each pulse, the pulse length of the pulse of pulse train is all identical.The amplitude of the pulse in the sketch map is corresponding to electric current, its flowing through lamps device 110 or LED 110.
Through the thought of adding pulse to pulse train rather than holding frequency is constant and the length that prolongs all pulses of pulse train changes frequency frequency has been reduced the factor (for example, factor 2 ... 256).In the embodiment shown in Fig. 6 a, frequency has reduced the factor 8, and this expression will have 8 pulses at the one-period shown in Fig. 6 a with first pulse train, 140 corresponding pwm signals, and wherein, the pulse length of pulse will be t
Pulse1/8th.Illustrate, frequency factor 16 is good compromises.Shown thought is based on the following fact: be not as conventional P WM thought, to use to have a pulse of variable-length, add pulse and be based on brightness.Add these pulses based on binary system thought.In the thought shown in Fig. 6 a, peak frequency is not limited.Frequency depends on brightness usually, and vice versa, and the frequency of pulse train or drive signal 120 is depended in brightness usually.Realized peak frequency in half of the brightness of lamp device 110.Through using this thought shown in Fig. 6 a, can realize high-frequency, especially in about 50% important brightness level of lamp device 110, wherein, the reaction of camera (for example HDTV camera) is the sensitiveest.
In peak frequency (value 8 among Fig. 6 a), the time between two rising edges of two last pulses successively of time and the pulse length t of pulse
PulseIdentical.Half the in the high-high brightness of lamp device 110, the frequency of drive signal 120 can be identical with the frequency of corresponding conventional P WM signal.
If the brightness of lamp device 110 should further increase to high-high brightness over half of lamp device 110; Then add other pulse; Therefore, the frequency of drive signal 120 reduces, but this does not have negative consequence; Because as stated, the HDTV camera is at the half the reaction most critical of the high-high brightness of lamp device 110.
Through the selection frequency and through having than the longer pulse length of conventional P WM signal; Pulse generator 130 and therefore equipment 100 can be used to drive the required pulse generator of the conventional P WM signal of the lamp device 110 that satisfies identical requirement than generation simple; For example, pulse generator 130.
Fig. 6 b shows the sketch map of Fig. 6 a, but wherein, the difference of the different pulse trains of different brightness level not only is the number of pulses that they comprise, and also is its pulse amplitude.In other words, by means of the thought shown in Fig. 6 b, not only number of pulses changes, and simultaneously, pulse amplitude (for example, the electric current in the inflow lamp device 110) also changes.This means, when the beginning that needs low-light level, produce pulse with very little current amplitude by the pulse generator 130 that is set in the lamp device 110.The amplitude of all pulses (current amplitude) can increase to 100% (for example, along with each increase frequency) from 0% linearity.In the embodiment shown in Fig. 6 b, the pulse amplitude of first pulse train (value 1) can be ten sixths of the amplitude (value 16) of the pulse of the 16 pulse train.The advantage that this thought has is, can softly not have the brightness regulation that step ground (perhaps at least almost do not have step or continuously) carries out very little degree.In addition, (for the little value shown in Fig. 6 b) has lowest amplitude based on the drive signal with low-frequency pulse train during beginning, therefore, has low-down brightness level.Because as stated, if the underfrequency of the drive signal of lamp device, then for example the camera of HDTV camera shows pulse, so this is favourable to having the higher brightness degree only.Can come the amplitude of regulating impulse through the digital analog converter of pulse generator 130, wherein, pulse generator 130 can be for example traditional microcontroller.
Fig. 6 c shows the sketch map of the drive signal of the different pulse trains with the different brightness level that are used for lamp device 110.The difference of the pulse train shown in the pulse train shown in Fig. 6 c and Fig. 6 a is; The peak frequency of pulse train is restricted (in the embodiment shown in Fig. 6 c; Be restricted to frequency factor 4), and when reaching the peak frequency of pulse train, no longer further add independent vein and dash; But change the pulse length of pulse train, with the brightness of further increase lamp device 110.Therefore the pulse generator of the generation pulse train shown in Fig. 6 c can be according to the pulse generator 130 of Fig. 1 a with according to the combination of the pulse generator 330 of Fig. 3 a.In Fig. 6 c, the difference of preceding four pulse trains (value 1 to value 4) is the umber of pulse that it comprises.Since the 5th pulse train, the difference of pulse train is the length of the pulse that it comprises.Pulse length does not prolong continuously.This means that pulse prolongation value usually is the pulse length t of the pulse of 1 first pulse train
PulseValue is that 1 first pulse train for example can be first pulse train 140 according to Fig. 1 b.Value is that 2 second pulse train for example can be second pulse train 160 according to Fig. 1 b.The 4th pulse train (value 4) for example can be first pulse train 340 according to Fig. 3 b.The 5th pulse train (value 5) for example can be second pulse train 360 according to Fig. 3 b.
Than conventional P WM signal, the thought shown in Fig. 6 c has reduced factor 2 with the frequency of drive signal ... 256.For easy reason, in Fig. 6 c, show reducing of frequency factor 4.As stated, illustrate, frequency factor 16 is good compromises.This notion is based on this, is not to use the pulse (PWM) with variable-length, adds a plurality of pulses and be based on required brightness.Add these pulses based on binary approach.For example, when in pulse train, containing the factor and be 16 16 pulses or the factor and be four pulses of 4, the further increase for brightness comes to increase as early as possible pulse length based on identical binary approach.In the method, improve frequency, for example up to 16 pulses that one-period is provided (perhaps in the embodiment shown in Fig. 2 c, four pulses of one-period).After this (value is the beginning of 5 the 5th pulse train) in order further to increase brightness, in addition, no longer improved frequency.On the contrary, the pulse length from the pulse to the pulse is prolonged (this means that the pulse length of the pulse that contains in the pulse train is extended).The pulse length of pulse can not prolong continuously, but with the length (t of first pulse of first pulse train
Pulse) step prolong.
For example; If the pulse length of first pulse of first pulse train is 1ms; Then after having added 15 other pulses for factor 16 (in the embodiment shown in Fig. 6 c; For the factor 4, added after three other pulses), first pulse extends to 2ms (its pulse length increases to 2ms).If all 16 pulses then (in the embodiment shown in Fig. 6 c, after all four pulses) all extend to 2ms, then first pulse extends to 3ms and continues, and is continuous high signal (value 16 among Fig. 6 c) up to drive signal.
Fig. 6 d shows sketch map, and the difference of itself and Fig. 6 c is that along with brightness increases not only the frequency of drive signal improves or the length of pulse prolongs, and the amplitude of the pulse of pulse train has also changed.As in Fig. 6 d, described, this and Fig. 6 b are similar, and identical advantage is provided.
Four thought shown in Fig. 6 a to 6d and conventional P WM signal are different at different aspect.Conventional P WM signal has constant frequency, and wherein, the pulse emission pause ratio is changed (for example, continuously changing).In addition, the amplitude of the pulse of pwm signal is constant.
In contrast to this, thought described herein or method have variable frequency and/or pulse with the discrete length interpolation.In the drive signal based on the pulse train shown in Fig. 6 a to 6d, the interim pulse length of the primitive period of drive signal can be different in the optional position of primitive period in the phase.In addition, the amplitude of pulse can change.
Fig. 7 shows the flow chart of the method 700 of the drive signal that is used to produce the lamp device.Method 700 comprises the step 710 that is used in response to the first brightness request of first brightness being produced first pulse train.First pulse train has first frequency.
In addition, method 700 comprises in response to the step 720 that the second brightness request of second brightness is produced second pulse train.Second pulse train has second frequency, and wherein, the first frequency of first pulse train is different from the second frequency of second pulse train.Second pulse train further comprises two adjacent pulses of first pulse train and comprises other pulses between two adjacent pulses.Other pulses of second pulse train are not included in first pulse train.
According to other execution mode, method 700 can be included in the step of the reception first brightness request before the step 710 that produces first pulse train.In addition, method 700 can comprise the step of the step 720 reception second brightness request before that produces second pulse train.
Fig. 8 shows the flow chart of the method 800 of the drive signal that is used to produce the lamp device.Method 800 comprises in response to the step 810 that the first brightness request of first brightness is produced first pulse train.First pulse train comprises that at least three independent veins dash.
In addition, method 800 comprises the step 820 that produces second pulse train that is used for second brightness.Second pulse train comprises that at least three independent veins of first pulse train dash.Part during at least three independent veins of second pulse train dash have with first pulse train in identical length, and at least one in dashing of at least three independent veins of second pulse train its corresponding independent vein in first pulse train dashes and has different length.
According to other execution mode, method 800 can comprise the step of the reception first brightness request before the step 810 that produces first pulse train.In addition, method 800 can comprise the step of the step 820 reception second brightness request before that produces second pulse train.
Than conventional P WM thought, the thought of the drive signal of lamp device that provides described herein has a plurality of advantageous characteristics.
Though under the background of equipment, described aspect some, obviously, the description of corresponding method is also represented in these aspects, and wherein, piece or device are corresponding to the characteristic of method step or method step.Similarly, also represent the description of corresponding blocks or the item or the characteristic of corresponding device aspect under the background of method step, describing.
According to the particular implementation requirement, embodiment of the present invention can be implemented with hardware or software.The digital storage media that stores the electronically readable control signal above can using (for example; Floppy disk, DVD, blue light, CD, ROM, PROM, EPROM, EEPROM or flash memory) carry out this enforcement; This electronically readable control signal and programmable computer system cooperation (perhaps can cooperate), feasible each method of carrying out.Therefore, digital storage media can be computer-readable.
Comprise the data medium with electronically readable control signal according to certain embodiments of the present invention, this electronically readable control signal can be cooperated with programmable computer system, feasible one of the method described herein of carrying out.
Usually, execution mode of the present invention can be used as the computer program with program code and implements, and when computer program moved on computers, program code can be operated and be used for one of manner of execution.Program code for example can be stored on the machine-readable carrier.
Other execution modes comprise that being stored in being used on the machine-readable carrier carries out the computer program of one of method described herein.
In other words, therefore the execution mode of the inventive method is the computer program with program code, and when computer program moved on computers, program code was used to carry out one of method described herein.
Therefore other execution modes of the inventive method are the data mediums (or digital storage media or computer-readable medium) of computer program that is used to carry out one of method described herein that comprises above-noted.
Therefore other execution modes of the inventive method are data flow or the bursts that expression is used to carry out the computer program of one of method described herein.Data flow or burst for example can be configured to connect (for example, via the Internet) transmission via data communication.
Other execution mode comprises processing unit, and for example, computer or programmable logic device are configured to or are applicable to one of the method described herein of carrying out.
The computer of the computer program that is used to carry out one of method described herein above comprising, other execution mode is installed.
In some embodiments, programmable logic device (for example, field programmable gate array) can be used to carry out some or repertoire of method described herein.In some embodiments, field programmable gate array can be cooperated with microprocessor, to carry out one of method described herein.Usually, preferably come manner of execution through any hardware equipment.
Above-mentioned execution mode is only explained principle of the present invention.Should be appreciated that the modification of details described herein and layout and change will be conspicuous to those skilled in the art.Therefore, only be intended to limit by the scope of accompanying claims, rather than by limiting through the detail that description and explanation appeared to the execution mode here.
Claims (21)
1. equipment (100) that is used to produce the drive signal (120) of lamp device (110), said equipment (100) comprising:
Pulse generator (130) is used for producing first pulse train (140) in response to the first brightness request to first brightness, and said first pulse train (140) has first frequency; And
Be used for producing second pulse train (160) in response to the second brightness request to second brightness, said second pulse train (160) has second frequency;
Wherein, said first frequency is different from said second frequency;
Wherein, Said second pulse train (160) comprises two adjacent pulses (142a, 142b) of said first pulse train (140) and comprises other pulses (162a) between said two adjacent pulses (142a, 142b) that said other pulses (162a) are not included in said first pulse train (140); And
Wherein, said pulse generator is configured to provide pulse train, makes different follow-up at afterpulse for said pulse train, the asynchronism(-nization) between two rising edges of the pulse of said pulse train.
2. equipment according to claim 1 (100); Wherein, Said pulse generator (130) is configured to produce said first pulse train (140) and said second pulse train (160), the pulse length (t that makes said two adjacent pulses (142a, 142b) and said other pulses (162a)
Pulse) identical.
3. equipment according to claim 1 (100), wherein, said first brightness of said second brightness ratio is bright.
4. equipment according to claim 1 (100) further comprises brightness request generator (130), and being configured to provides said first brightness request and the said second brightness request at least to the input of said pulse generator (130).
5. equipment according to claim 1 (100); Wherein, Said pulse generator (130) is configured to produce said first pulse train (140) and said second pulse train (160), makes that the time span of said first pulse train (140) is identical with the time span of said second pulse train (160).
6. equipment according to claim 1 (100); Wherein, Said pulse generator (130) is configured to produce said second pulse train (160); Make that the time between the rising edge of trailing edge and said other pulses (162a) of first pulse (142a) in said two adjacent pulses (142a, 142b) is identical with one pulse length in said adjacent pulse (142a, 142b) or said other pulses (162a), or the multiple of one pulse length in said adjacent pulse (142a, 142b) or said other pulses (162a).
7. equipment according to claim 1 (100); Wherein, Said pulse generator (130) is configured to produce said second pulse train (160), makes that second time between the rising edge of trailing edge and second pulse (142b) in said two adjacent pulses (142a, 142b) of the very first time and said other pulses (162a) between the rising edge of trailing edge and said other pulses (162a) of first pulse (142a) in said two adjacent pulses (142a, 142b) is identical.
8. equipment according to claim 1 (100); Wherein, Said pulse generator (130) is configured to produce said first pulse train (140) and said second pulse train (160); Make that first amplitude of pulse of said first pulse train (140) is identical, make that second amplitude of pulse of said second pulse train (160) is identical, and make said first amplitude be lower than said second amplitude.
9. equipment according to claim 1 (100,500) further comprises brightness request generator (590), is configured to be provided to major general's first brightness request and the second brightness request input of said pulse generator (130).
10. equipment according to claim 1 (100); Wherein, Said pulse generator (130) is configured to produce a plurality of different pulse trains in response to a plurality of different brightness requests; Make pulse train in said a plurality of pulse train corresponding to the brightness request in said a plurality of brightness requests, and make said a plurality of pulse train differ from one another aspect it umber of pulse that comprises.
11. equipment according to claim 10 (100), wherein, said pulse generator (130) is configured to produce said a plurality of different pulse trains, makes said a plurality of different pulse trains further differ from one another aspect the amplitude of it pulse that comprises.
12. an equipment (300) that is used to produce the drive signal (320) of lamp device (110), said equipment (300) comprising:
Pulse generator (330) is used for producing first pulse train (340) in response to the first brightness request to first brightness, and said first pulse train (340) comprises that at least three independent veins dash (342a, 342b, 342c); And
Be used for producing second pulse train (360) in response to the second brightness request to second brightness; Said second pulse train (360) comprises that said at least three independent veins dash (342a, 342b, 362c); Wherein, The part that said at least three independent veins dash (342a, 342b, 362c) have with said first pulse train (340) in identical length, and said at least three independent veins dash at least one pulse (362c) in (342a, 342b, 362c) and dash (342c) than the corresponding independent vein in said first pulse train (340) and have different length.
13. equipment according to claim 12 (300); Wherein, Said pulse generator (330) is configured to produce said first pulse train (340) and said second pulse train (360), and the length that makes said at least three independent veins of said first pulse train (340) dash (342a, 342b, 342c) is minimum pulse length (t
Pulse) multiple or said minimum pulse length (t
Pulse); And at least one pulse (362c) that makes at least three independent veins of said second pulse train (360) dash (342a, 342b, 362c) is dashed (342c) than its corresponding independent vein in said first pulse train (340) and is had different length, dashes (342c) with its corresponding independent vein in said first pulse train (340) and differs said minimum pulse length (t
Pulse) integral multiple or differ said minimum pulse length (t
Pulse).
14. equipment according to claim 12 (300); Wherein, Said pulse generator (300) is configured to produce said first pulse train (340) and said second pulse train (360); The length that makes said three independent veins dash is identical, perhaps makes first length of the pulse of said three independent veins in dashing and second length of two other pulse that said three independent veins dash differ said minimum pulse length.
15. equipment according to claim 12 (300,500) further comprises brightness request generator (590), is configured to be provided to major general's first brightness request and the second brightness request input of said pulse generator (330).
16. equipment according to claim 12 (300); Wherein, Said pulse generator (330) is configured to produce said first pulse train (340) and said second pulse train (360); Make that first amplitude of pulse of said first pulse train (340) is identical, make that second amplitude of pulse of said second pulse train (360) is identical, and make said first amplitude be lower than said second amplitude.
17. equipment according to claim 12 (300); Wherein, Said pulse generator (330) is configured to produce a plurality of different pulse trains in response to a plurality of different brightness requests; Make pulse train in said a plurality of pulse train corresponding to the brightness request in said a plurality of brightness requests, and make said a plurality of pulse train differ the length of it at least one pulse that comprises each other.
18. equipment according to claim 17 (300), wherein, said pulse generator (330) is configured to produce said a plurality of different pulse trains, makes said a plurality of different pulse trains further differ from one another aspect the amplitude of it pulse that comprises.
19. a method (700) that is used to produce the drive signal of lamp device comprising:
The first brightness request in response to first brightness produces first pulse train, and said first pulse train has first frequency;
The second brightness request in response to second brightness produces second pulse train; Said second pulse train has second frequency; Wherein, said first frequency is different with said second frequency, and wherein; Said second pulse train comprises two adjacent pulses of said first pulse train and also comprises other pulses between said two adjacent pulses that said other pulses are not included in said first pulse train; And
Pulse train is provided, makes different follow-up for said pulse train, the asynchronism(-nization) between two rising edges of the pulse of said pulse train at afterpulse.
20. a method (800) that is used to produce the drive signal of lamp device comprising:
The first brightness request in response to first brightness produces first pulse train, and said first pulse train comprises that at least three independent veins dash; And
Generation is used for second pulse train of second brightness; Said second pulse train comprises that said at least three independent veins dash; Wherein, The part that said at least three independent veins dash have with said first pulse train in identical length, and wherein, said at least three independent veins dash at least one dash than its corresponding independent vein in said first pulse train and have different length.
21. computer readable digital storage medium; Store computer program on it with program code; When said computer program moves on computers, said program code is used to carry out according to the method for claim 19 or according to the method for claim 20.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/752,452 | 2010-04-01 | ||
| US12/752,452 US20110241560A1 (en) | 2010-04-01 | 2010-04-01 | Apparatus for generating a drive signal for a lamp device and method for generating a drive signal for a lamp device |
| EP10159003A EP2373125B1 (en) | 2010-04-01 | 2010-04-01 | Apparatus for generating a drive signal for a lamp device and method for generating a drive signal for a lamp device |
| EP10159003.2 | 2010-04-01 | ||
| PCT/EP2011/054446 WO2011120855A1 (en) | 2010-04-01 | 2011-03-23 | Apparatus for generating a drive signal for a lamp device and method for generating a drive signal for a lamp device |
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| CN102835188A true CN102835188A (en) | 2012-12-19 |
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| CN2011800180969A Pending CN102835188A (en) | 2010-04-01 | 2011-03-23 | Apparatus for generating a drive signal for a lamp device and method for generating a drive signal for a lamp device |
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| JP (1) | JP2013519988A (en) |
| CN (1) | CN102835188A (en) |
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| CN105593788A (en) * | 2013-07-22 | 2016-05-18 | 米斯菲特公司 | Methods and systems for displaying representations of facial expressions and activity indicators on devices |
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| DE102012113024A1 (en) * | 2012-12-21 | 2014-06-26 | Hamilton Bonaduz Ag | Optical measuring device |
| JP6210374B2 (en) | 2013-11-01 | 2017-10-11 | 有限会社大平技研 | LED drive circuit |
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| WO2011120855A1 (en) | 2011-10-06 |
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