CN100536632C - Discharge lamp igniting apparatus and lighting apparatus equipped with same - Google Patents
Discharge lamp igniting apparatus and lighting apparatus equipped with same Download PDFInfo
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- CN100536632C CN100536632C CNB2004100314734A CN200410031473A CN100536632C CN 100536632 C CN100536632 C CN 100536632C CN B2004100314734 A CNB2004100314734 A CN B2004100314734A CN 200410031473 A CN200410031473 A CN 200410031473A CN 100536632 C CN100536632 C CN 100536632C
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Abstract
Provided is a discharge lamp lighting device capable of detecting erroneous wiring and to provide a luminaire equipped with it. This discharge lamp lighting device is provided with: an inverter circuit (3) for making discharge lamps (La1, La2 and La3) emit light by composing a series circuit formed by serially connecting filaments of the discharge lamps (La1, La2 and La3) each having the lighting filaments at both ends to one another, and by supplying power to the series circuit; an erroneous connection detection circuit (8) for detecting the voltage of a filament (F3a) within the serially connected filaments (F1b, F2a, F2b and F3a); and an IC circuit (10) for controlling the operation of the inverter circuit (3) so as to adjust the quantity of supply of power according to a connection state of the discharge lamps (La1, La2 and La3) based on the voltage of an erroneous connection detection signal (Vk1) outputted from the detection circuit (8).
Description
Technical field
The present invention relates to lighting apparatus for discharge lamp that three discharge lamp series connection more than the lamp are lighted and the lighting apparatus that has this device.
Background technology
Known in the past a kind of lighting apparatus for discharge lamp that three discharge lamps more than the lamp are lighted in the mode that is connected in series (for example, with reference to patent documentation 1).Fig. 5 is the circuit diagram of the structure of the existing lighting apparatus for discharge lamp of expression.Lighting apparatus for discharge lamp 101 shown in Fig. 5, by putting on discharge lamp La1, La2, the La3 that three lamps are connected in series by the output transformer 102 that constitutes by leakage transformer, make discharge lamp La1, La2, La3 luminous by the high frequency voltage of generations such as abridged power circuit or inverter circuit among the figure.In addition, discharge lamp La1, discharge lamp La2, discharge lamp La3, filament F1a, the F1b, filament F2a, F2b, filament F3a, the F3b that have the usefulness lighted at two ends respectively.
In addition, the end of the secondary coil N2 of output transformer 102 is connected with filament F1a in the discharge lamp La1, and the other end of secondary coil N2, is connected with filament F3b in the discharge lamp La3 by capacitor 103.So the voltage from the secondary coil N2 of output transformer 102 output puts on the closed-loop path that is made of the filament F3b in the filament F1a in the discharge lamp La1, capacitor 104, the discharge lamp La3, capacitor 103.Therefore, produce resonance by secondary coil N2 and capacitor 104, and the high frequency voltage of regulation is applied on the capacitor 104, and then also this voltage is put on discharge lamp La1, La2, La3 by this resonance.At this moment, from output transformer 102 via filament F1a, capacitor 104, filament F3b and return upper reaches, the closed-loop path overcurrent of capacitor 103, thereby filament F1a, the filament F3b at the two ends that are positioned at the series circuit that is made of discharge lamp La1, La2, La3 carried out preheating.
In addition, primary side at output transformer 102, also be provided with preheating coil N3, the N4 of filament, the preheating end of coil N3, be connected with the end of filament F1b in the discharge lamp La1, the other end is connected by the end of the interior filament F2a of capacitor 105 and discharge lamp La2, and the other end of filament F1b, F2a is connected to each other together.In addition, preheating is with the end of coil N4, and the end by the filament F2b in capacitor 106 and the discharge lamp La2 is connected, and the end of the filament F3a that the other end and discharge lamp La3 are interior is connected, and the other end of filament F2b, F3a is connected to each other together.
So, from preheating with coil N3 via filament F1b, filament F2a, and capacitor 105 return preheating and flow through the preheating electric current with the current circuit of coil N3, thereby filament F1b and filament F2a are carried out preheating.In addition, flow through the preheating electric current with the current circuit of coil N4 returning preheating with coil N4 via capacitor 106, filament F2b and filament F3a, thereby filament F2b and filament F3a are carried out preheating from preheating.In this manner, after filament F1a, F1b, F2a, F2b, F3a, F3b preheating, it is luminous to be easy to make discharge lamp La1, La2, La3 to begin.
In addition, also connect connection resistance 109 between resistance 108, filament F3a, the F3b in discharge lamp La3 respectively between filament F1a, the F1b in discharge lamp La1 between connection resistance 107, filament F2a, the F2b in discharge lamp La2.Therefore, can with direct voltage Vdc by resistance 110, filament F1a, resistance 107, filament F1b, filament F2a, resistance 108, filament F2b, filament F3a, resistance 109, filament F3b, and resistance 111 put among the figure abridged discharge lamp testing circuit that comes off.
According to this configuration, when among discharge lamp La1, La2, the La3 any one come off, above-mentioned pass through resistance 110, filament F1a, resistance 107, filament F1b, filament F2a, resistance 108, filament F2b, filament F3a, resistance 109, filament F3b, and the path of resistance 111 will be cut off halfway, the result makes direct voltage Vdc can not put on the discharge lamp testing circuit that comes off, therefore, the discharge lamp testing circuit that comes off in abridged among the above-mentioned figure, any one that can detect among discharge lamp La1, La2, the La3 comes off.
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Summary of the invention
(problem that invention will solve)
; in the above-mentioned lighting apparatus for discharge lamp that three discharge lamp series connection more than the lamp are lighted; as mentioned above; the distribution of the circuit layout of preheating filament, the distribution that is used for the circuit that the joint detection discharge lamp comes off or other protective circuits etc. is very complicated; for example; as shown in Figure 6, exist the abnormal conditions such as wiring error that the wiring error that is easy to take place wiring operation in the lighting apparatus for discharge lamp manufacturing process or user cause because of the connection of having made a mistake connector etc. when changing discharge lamp.
The present invention develops in view of aforesaid problem, and its objective is provides a kind of lighting apparatus that can detect the lighting apparatus for discharge lamp of wiring error and have this device.
(solving the means of problem)
For achieving the above object, the lighting apparatus for discharge lamp of first of the present invention, to have at the two ends of each discharge lamp to light and constitute the series circuit that connects with series system by filament is linked together with a plurality of discharge lamps more than three lamps of filament, and have by above-mentioned series circuit supply capability being made the luminous power feeding section of above-mentioned a plurality of discharge lamp, it is characterized in that: have at least one the filament voltage test section of voltage that is used for detecting the above-mentioned a plurality of filaments that are being connected in series, according to by the action of the above-mentioned power feeding section of the detected voltage control of above-mentioned filament voltage test section so that adjust the control part of the quantity delivered of above-mentioned electric power by the connection status of above-mentioned series circuit, above-mentioned filament voltage test section, respectively the above-mentioned a plurality of filaments that are being connected in series are detected its each voltage, above-mentioned control part, according to the result after will comparing mutually by detected above-mentioned each voltage of above-mentioned filament voltage test section, the connection status that detects above-mentioned series circuit has no abnormal, controls the action of above-mentioned power feeding section simultaneously so that adjust the quantity delivered of above-mentioned electric power.
In addition, above-mentioned lighting apparatus for discharge lamp is characterized in that: above-mentioned series circuit also has by making electric current flow through the preheat curent circuit that the above-mentioned a plurality of filaments that are being connected in series carry out preheating.
Further, above-mentioned lighting apparatus for discharge lamp, it is characterized in that: above-mentioned control part, also basis is by detected above-mentioned each voltage of above-mentioned filament voltage test section, judge the discharge lamp number that is being connected in the above-mentioned series circuit, simultaneously according to the action of the above-mentioned power feeding section of discharge lamp numerical control system of this judgement so that adjust the quantity delivered of above-mentioned electric power.
In addition, above-mentioned lighting apparatus for discharge lamp, it is characterized in that: above-mentioned power feeding section, have the output transformer that is used for an elementary side and the insulation of a secondary side, simultaneously, put on above-mentioned series circuit and supply capability by the voltage that produces in the secondary coil with above-mentioned output transformer, above-mentioned preheat curent circuit, also the preheating of the secondary side by being located at above-mentioned output transformer makes electric current flow through the above-mentioned a plurality of filaments that are being connected in series with coil except that an above-mentioned secondary lateral coil, also have and be used for detecting above-mentioned preheating produces with coil the preheating relevant coil voltage test section with coil voltage with the voltage that produces in the above-mentioned secondary lateral coil, above-mentioned control part, also, control the action of above-mentioned power feeding section so that adjust the quantity delivered of above-mentioned electric power according to by the detected above-mentioned preheating coil voltage of above-mentioned coil voltage test section.
For achieving the above object, the lighting apparatus of second portion of the present invention, have the lighting apparatus for discharge lamp of lighting discharge lamp, to the power supply unit of above-mentioned lighting apparatus for discharge lamp supply capability, this lighting apparatus is characterised in that: above-mentioned lighting apparatus for discharge lamp is the present invention 1 or 2 described lighting apparatus for discharge lamp.
Above-mentioned lighting apparatus for discharge lamp and lighting apparatus with aforesaid structure, as during wiring error, the voltage of the above-mentioned a plurality of filaments that are being connected in series will be with just often different, so, can be according to by the detected voltage detecting wiring error of above-mentioned filament voltage test section.
Description of drawings
Fig. 1 is the circuit diagram of structure one example of the lighting apparatus of expression the present invention the 1st execution mode.
Fig. 2 is the circuit diagram of the variation of expression lighting apparatus shown in Figure 1.
Fig. 3 is the circuit diagram of structure one example of the lighting apparatus of expression the present invention the 2nd execution mode.
Fig. 4 is the circuit diagram of structure one example of the lighting apparatus of expression the present invention the 3rd execution mode.
Fig. 5 is the circuit diagram of structure one example of the existing lighting apparatus for discharge lamp of expression.
Fig. 6 is illustrated in the circuit diagram that the example of wiring error has taken place in the lighting apparatus for discharge lamp shown in Figure 5.
Symbol description:
The 1-power circuit; The 2-voltage conversion circuit; 3-inverter circuit (power feeding section); The 4-output transformer; 5-level one lateral circuit; The 6-control circuit; The 7-discharge lamp testing circuit that comes off; 8,8a-connects error detecting circuit (filament voltage test section); 9-control power supply circuit; 10,10a, 10b-IC circuit (control part); 16,21,22-switch element; 53-coil voltage test section; F1a, F1b, F2a, F2b, F3a, F3b-filament; La1, La2, La3-discharge lamp; The elementary lateral coil of N1-; N2-level one lateral coil; N3, N4-preheating coil (preheat curent circuit); N5-control power supply coil.
Embodiment
Below, embodiments of the present invention are described with reference to the accompanying drawings.In addition, the structure that is marked with prosign among each figure is represented identical structure, and its explanation is omitted.
(the 1st execution mode)
Fig. 1 is the circuit diagram of structure one example of the lighting apparatus of expression the present invention the 1st execution mode.Lighting apparatus shown in Fig. 1 has by a secondary lateral circuit 5 and lighting apparatus for discharge lamp that control circuit 6 constitutes and discharge lamp La1, La2, the La3 that is connected in series to the DC power supply circuit 1 of lighting apparatus for discharge lamp supply capability, voltage conversion circuit 2, inverter circuit 3, output transformer 4, output transformer 4.
DC power supply circuit 1 has filter circuit 1a, rectification circuit 1b.Filter circuit 1a has capacitor 11 and filter 12, is used to prevent to invade from the noise of industrial AC power AC the circuit of rectification circuit 1b back, or is used in contrast prevent that the noise from inverter circuit 3 from entering power supply AC side.Rectification circuit 1b has diode bridge 13 and capacitor for filter 14.Be used for to be pulsating voltage from the AC voltage conversion that exchanges power supply AC.
Discharge lamp La1, La2, La3, two ends are provided with filament, for example are straight tube fluorescent lamps such as FL20W or FL40W.Discharge lamp La1 has filament F1a, F1b, and discharge lamp La2 has filament F2a, F2b, and discharge lamp La3 has filament F3a, F3b.So, interconnect, the end of F2b and F3a is interconnected by a end filament F1b and F2a, discharge lamp La1, La2, La3 three lamps can be connected in series.In addition, the negative electrode of the diode 17 in the voltage conversion circuit 2 is by being used to detect the end that resistance 51 that discharge lamp comes off is connecting filament F1a.
In a secondary lateral circuit 5, the end of a secondary lateral coil N2 of output transformer 4, the end by the filament F1a in capacitor 28 and the discharge lamp La1 is connected, and the end of the filament F3b in the other end of a secondary lateral coil N2 and the discharge lamp La3 is connected.In addition, in a secondary lateral circuit 5, have and discharge lamp La1, La2, the series circuit parallel connection of La3 promptly be connected the end that is not connected of filament F1a and filament F3b with output transformer 4 not with a end that output transformer 4 is connected between capacitor 31, with discharge lamp La1, the series circuit parallel connection of La2 promptly be connected the tie point of filament F1a and capacitor 31 and filament F2b not with a end that filament F3a is connected between main order capacitor 32, with discharge lamp La1 parallel connection promptly be connected the tie point of filament F1a and capacitor 31 and filament F1b not with a end that filament F2a is connected between order capacitor 33.
In addition, promptly be connected a resistance value more than the big resistance 34 of the impedance of discharge lamp La1 with discharge lamp La1 parallel connection between filament F1a and tie point capacitor 28 and filament F1b and tie point capacitor 33, promptly between the end that is not connected of filament F2a and filament F2b and tie point capacitor 32, be connected a resistance value with discharge lamp La2 parallel connection, promptly between the end that is not connected of filament F3a and filament F3b and tie point output transformer 4, be connected a resistance value more than the big resistance 36 of the impedance of discharge lamp La3 with filament F2b with discharge lamp La3 parallel connection more than the big resistance 35 of the impedance of discharge lamp La2 with filament F1b.
In addition, the preheating end of coil N3, the tie point with capacitor 33 by the filament F1b in capacitor 29 and the discharge lamp La1 is connected, an end that the is not connected connection of filament F2a in the other end and the discharge lamp La2 with filament F1b, the preheating end of coil N4, the tie point with capacitor 32 by the filament F2b in capacitor 30 and the discharge lamp La2 is connected, an end that is not connected with the filament F2b connection of the filament F3a in the other end and the discharge lamp La3.
Control circuit 6, have detect discharge lamp come off the discharge lamp of situation come off testing circuit 7, detect the control of switch element 21,22 of connection error detecting circuit 8, control power supply circuit 9, the switch element 16 that is used for driving voltage translation circuit 2 and inverter circuit 3 of connection mistake of load distribution with IC circuit 10 from output transformer 4 to discharge lamp to the control circuit supply power.
The discharge lamp testing circuit 7 that comes off has resistance 37,38, capacitor 39, diode 40, voltage stabilizing didoe 41.In addition, the filament F3a in the discharge lamp La3 and the tie point of capacitor 31 are connected with circuit ground point by resistance 37 and reverse voltage stabilizing didoe 41.And connecting the series circuit of diode 40 and resistance 38 between the negative electrode of voltage stabilizing didoe 41, anode, capacitor 39 is connected in parallel with resistance 38.The tie point of diode 40 and resistance 38 is connecting the discharge lamp testing circuit 7 that comes off, and the voltage that will produce on the tie point of diode 40 and resistance 38, outputs to IC circuit 10 as the discharge lamp detection signal VL that comes off.
Connect error detecting circuit 8, have resistance 42a, diode 43a, resistance 44a, 45a and capacitor 46a.The preheating tie point of coil N4 and filament F3a, be connected with circuit ground point by resistance 42a, diode 43a, resistance 44a, 45a, capacitor 46a and resistance 45a are connected in parallel, and the voltage that will produce on the tie point of resistance 44a, 45a outputs to IC circuit 10 as connecting error detection occurs signal Vk1.
Control power supply circuit 9 has diode 48, resistance 47, capacitor 49, voltage stabilizing didoe 50.In addition, the control power supply end of coil N5, be connected with circuit ground point, the other end is connected with circuit ground point by diode 48, resistance 47 and reverse voltage stabilizing didoe 50, capacitor 49, be connected in parallel with voltage stabilizing didoe 50, the voltage of the tie point of resistance 47 and voltage stabilizing didoe 50 is supplied with IC circuit 10 as control power supply voltage.
Below, the action of lighting apparatus shown in Figure 1 is described.AC supply voltage AC is transformed to pulsating voltage by DC power supply circuit 1, and outputs to voltage conversion circuit 2.Then, will boost to setting from the pulsating voltage of DC power supply circuit 1 by voltage conversion circuit 2, and be transformed to direct voltage Vdc.Then, by inverter circuit 3 this direct voltage Vdc is transformed to high frequency voltage, this high frequency voltage produces between the drain electrode of switch element 21 and source electrode.This high frequency voltage puts on the elementary lateral coil N1 of output transformer 4 by capacitor 23, consequently, produces voltage in a secondary lateral coil N2 of output transformer 4.
The voltage that produces in a secondary lateral coil N2 of output transformer 4 puts on the closed-loop path of returning a secondary lateral coil N2 via the filament F3b in the filament F1a in capacitor 28, the discharge lamp La1, capacitor 31, the discharge lamp La3.Therefore, produce resonance by the secondary coil N2 of output transformer 4 and capacitor 31, and the high frequency voltage of regulation is applied on the capacitor 31, and then also this voltage is put on discharge lamp La1, La2, La3 by this resonance.
At this moment, return upper reaches, the closed-loop path overcurrent of a secondary lateral coil N2 at a secondary lateral coil N2 via capacitor 28, filament F1a, capacitor 31, filament F3b, thereby filament F1a, the filament F3b at two ends carried out preheating from output transformer 4.In addition, flow through the preheating electric current with the current circuit of coil N3 returning preheating with coil N3 via capacitor 29, filament F1b and filament F2a, thereby filament F1b and filament F2a are carried out preheating from preheating.In addition, flow through the preheating electric current with the current circuit of coil N4 returning preheating with coil N4 via capacitor 30, filament F2b and filament F3a, thereby filament F2b and filament F3a are carried out preheating from preheating.In this manner, after filament F1a, F1b, F2a, F2b, F3a, F3b preheating, be easy to discharge lamp La1, La2, La3 are lighted.After lighting, a secondary lateral coil N2 of output transformer 4 plays a part so-called ballast, makes each discharge lamp flow through the lamp current of regulation.
Secondly, from the voltage of control power supply with coil N5 output, be transformed to pulsating current by diode 48, and supply with the parallel circuits of voltage stabilizing didoes 50 and capacitor 49 by resistance 47, compress into capable voltage stabilizing and, supply with IC circuit 10 by the action electricity consumption of 50 pairs of IC circuit 10 of voltage stabilizing didoe by after capacitor 49 filtering.
In addition, direct voltage Vdc from inverter circuit 3, so by resistance 51, filament F1a, resistance 34, filament F1b, filament F2a, resistance 35, filament F2b, filament F3a, resistance 36, and filament F3b put on the discharge lamp testing circuit 7 that comes off, the voltage that produces on the tie point of diode 40 and resistance 38 that discharge lamp comes off in the testing circuit 7 becomes high level, and outputs to IC circuit 10 as the discharge lamp detection signal VL that comes off.
In this case, when among discharge lamp La1, La2, the La3 any one come off, the above-mentioned resistance 51, filament F1a, resistance 34, filament F1b, filament F2a, resistance 35, filament F2b, filament F3a, resistance 36, filament F3b of passing through arrives the come off path of testing circuit 7 of discharge lamp and will be cut off halfway, the result makes direct voltage Vdc can not put on the discharge lamp testing circuit 7 that comes off, so, the voltage that produces on the tie point of diode 40 and resistance 38 becomes low level, and outputs to IC circuit 10 as the discharge lamp detection signal VL that comes off.
So IC circuit 10 when receiving low level discharge lamp when coming off detection signal VL, for example, stops the on-off action of switch element 16,21,22, thereby stop the electric power of discharge lamp La1, La2, La3 is supplied with.
In addition, when discharge lamp La1, La2, La3 normally put light yellow in the mode of three lamps series connection, in connecting error detecting circuit 8, by diode 43a the voltage of filament F3a is carried out rectification, and carry out dividing potential drop by resistance 44a, 45a, further carry out filtering, output to IC circuit 10 as connecting error detection occurs signal Vk1 then by capacitor 46a.
Now when the connection status of discharge lamp La1, La2, La3 for example because of wiring error etc. occurs when unusual, the voltage that connects error detection occurs signal Vk1 becomes and just often different voltage.Therefore, can will connect error detection occurs signal Vk1 and pre-set reference voltage range by IC circuit 10, be that the connection status voltage that is connected error detection occurs signal Vk1 just often of discharge lamp La1, La2, La3 compares, as connecting error detection occurs signal Vk1 in reference voltage range, the connection status that then is judged to be discharge lamp La1, La2, La3 is normal.And when the voltage that connects error detection occurs signal Vk1 had exceeded reference voltage range, the connection status that is judged to be discharge lamp La1, La2, La3 by IC circuit 10 for example occurred unusually because of wiring error etc.
And occur when unusual when the connection status that is judged to be discharge lamp La1, La2, La3 by IC circuit 10, for example, the on-off action of switch element 16,21,22 is stopped, thereby stop the electric power of discharge lamp La1, La2, La3 is supplied with, or change the on-off action frequency of switch element 16,21,22 and reduce the electric power of discharge lamp La1, La2, La3 is supplied with.
Mode as described above, the wiring error of wiring operation in the lighting apparatus for discharge lamp manufacturing process for example ought take place, or the user when changing discharge lamp, cause because of the connection of having made a mistake connector etc. abnormal conditions such as wiring error the time, can detect this wiring error by connecting error detecting circuit 8, then, output to IC circuit 10 with connecting error detection occurs signal Vk1 as the link information of the detected wiring error of expression etc., and adjust discharge lamp La1 according to connection error detection occurs signal Vk1 as link information by IC circuit 10, La2, the electric power quantity delivered of La3.
In addition, inverter circuit 3 is shown the half bridge circuit that adopts 2 switch elements, but also can be because of having adopted 1 switch element to make the degree of boosting than the big single hose of semibridge system or be easy to form the circuit modes such as push pull mode of output transformer 4.
In addition, voltage conversion circuit 2 shows the slicing formula circuit that boosts, but also can be the circuit of the so-called high frequency charging modes of step-down slicing formula circuit or inverter circuit 3 dual-purposes shown in the circuit diagram of Fig. 2 and semibridge system.Particularly, the circuit of high frequency charging modes is compared with the slicing mode of boosting, and can lower expense.
In addition, an elementary lateral coil N1 of output transformer 4 is connected by capacitor 23 between the drain electrode and source electrode of switch element 21, but also can be connected between the drain electrode and source electrode of switch element 22 by capacitor 23.
Further, as output transformer 4, show the example that adopts leakage transformer, but also can not have leakage inductance, but adopt common output transformer, and the secondary coil of choke and this output transformer is connected in series with leakage inductance.
In addition, IC circuit 10 shows by the switching frequency that changes inverter circuit 3 and adjusts example to the electric power quantity delivered of discharge lamp, but also can change the size of the direct voltage Vdc of voltage conversion circuit 2.
(the 2nd execution mode)
Below, the lighting apparatus of the present invention's the 2nd execution mode is described.Fig. 3 is the circuit diagram of structure one example of the lighting apparatus of expression the present invention the 2nd execution mode.Lighting apparatus shown in Figure 3 and lighting apparatus shown in Figure 1, different on following some.That is, in the lighting apparatus for discharge lamp of lighting apparatus shown in Figure 3, connect error detecting circuit 8a, also have resistance 42b, diode 43b, resistance 44b, 45b and a capacitor 46b.The preheating tie point of coil N3 and filament F2a, be connected with circuit ground point by resistance 42b, diode 43b, resistance 44b, 45b, capacitor 46b and resistance 45b are connected in parallel, and the voltage that will produce on the tie point of resistance 44b, 45b outputs to IC circuit 10a as connecting error detection occurs signal Vk2.Then, IC circuit 10a according to the result of the voltage ratio that will connect error detection occurs signal Vk1 and connect error detection occurs signal Vk2 after, judges that the connection status of discharge lamp La1, La2, La3 has no abnormal generation.
Other structures are identical with lighting apparatus shown in Figure 1, thereby its explanation is omitted, below, with regard to its action of feature description of present embodiment.At first, in the lighting apparatus for discharge lamp of lighting apparatus shown in Figure 3, when discharge lamp La1, La2, La3 normally put light yellow in the mode of three lamps series connection, in connecting error detecting circuit 8a, by diode 43a the voltage of filament F3a is carried out rectification, and carry out dividing potential drop by resistance 44a, 45a, and further carry out filtering by capacitor 46a, output to IC circuit 10a as connecting error detection occurs signal Vk1 then.On the other hand, by diode 43b the voltage of filament F2a is carried out rectification, and carry out dividing potential drop, further carry out filtering, output to IC circuit 10a as connecting error detection occurs signal Vk2 then by capacitor 46b by resistance 44b, 45b.
Then, by IC circuit 10a, the voltage that connects error detection occurs signal Vk1 is compared with the voltage that is connected error detection occurs signal Vk2, for example when (magnitude of voltage that connects error detection occurs signal Vk1)＜(magnitude of voltage that connects error detection occurs signal Vk2), the connection status that is judged to be discharge lamp La1, La2, La3 is normal.And when working as (magnitude of voltage that connects error detection occurs signal Vk1)＞(magnitude of voltage that connects error detection occurs signal Vk2), the connection status that is judged to be discharge lamp La1, La2, La3 by IC circuit 10a for example occurs unusually because of wiring error etc.
Then, by IC circuit 10a the on-off action of switch element 16,21,22 is stopped, thereby stop the electric power of discharge lamp La1, La2, La3 is supplied with, or change the on-off action frequency of switch element 16,21,22 and reduce the electric power of discharge lamp La1, La2, La3 is supplied with.In this case, owing to can judge connection status unusual of discharge lamp La1, La2, La3 according to the magnitude relationship that connects error detection occurs signal Vk1, Vk2, so can improve the precision of judgement.
In addition, IC circuit 10a, also can detect the discharge lamp number that is connecting as load by the level of judging the detection current potential that connects error detection occurs signal Vk1, Vk2 respectively, and make the switch element 21,22 of inverter circuit 3 carry out the driving frequency of on-off action, and output is adjusted according to the rated value and the lamp number of lamp according to its testing result adjustment.
Specifically, for example, in the discharge lamp La1, the La2 that are connected in series, La3, the discharge lamp La2 of central authorities is for example fixed with metal fittings etc., so that it structurally can not come off.At this moment, only connecting as load under the state of 1 discharge lamp, on connection error detection occurs signal Vk1, Vk2, produce voltage hardly, thereby signal level is being a low level.And only connecting as load under the state of 2 discharge lamps, connect error detection occurs signal Vk1, Vk2 one of them on produce voltage hardly, thereby connect error detection occurs signal Vk1, Vk2 one of them be low level.Further, under the state that 3 discharge lamps as load all connect, the signal level that connects error detection occurs signal Vk1, Vk2 all is a high level.
So, when the signal level that connects error detection occurs signal Vk1, Vk2 all is high level, is judged as 3 discharge lamps by IC circuit 10a and is all connecting.So, change the switching frequency of switch element 16,21,22 etc. by IC circuit 10a, with the electric power quantity delivered of adjustment, thereby supply with the electric power that is used for 3 discharge tube lightings by voltage conversion circuit 2 and inverter circuit 3 to discharge lamp.
In addition, when connecting error detection occurs signal Vk1 is that high level is when connecting error detection occurs signal Vk2 and being low level, be that low level is when connecting error detection occurs signal Vk2 and being high level maybe when connecting error detection occurs signal Vk1, being judged as the discharge lamp that is connecting by IC circuit 10a is 2, so, change the switching frequency of switch element 16,21,22 etc. by IC circuit 10a, with the electric power quantity delivered of adjustment, thereby supply with the electric power that is used for 2 discharge tube lightings by voltage conversion circuit 2 and inverter circuit 3 to discharge lamp.
And when the signal level that connects error detection occurs signal Vk1, Vk2 all is low level, being judged as the discharge lamp that is connecting by IC circuit 10a is 1, so, change the switching frequency of switch element 16,21,22 etc. by IC circuit 10a, with the electric power quantity delivered of adjustment, thereby supply with the electric power that is used for 1 discharge tube lighting by voltage conversion circuit 2 and inverter circuit 3 to discharge lamp.
As mentioned above, IC circuit 10a, according to the signal level that connects error detection occurs signal Vk1, Vk2, judge the discharge lamp number that is connecting in the secondary-side circuitry 5, and according to the action of this lamp numerical control system voltage conversion circuit 2 and inverter circuit 3, thereby supply with secondary-side circuitry 5 in the electric power that adapts of the discharge lamp number that is being connected, so, even when having discharge lamp to come off, still can supply with and make the luminous suitable electric power of discharge lamp that is connecting.
(the 3rd execution mode)
Below, the lighting apparatus of the present invention's the 3rd execution mode is described.Fig. 4 is the circuit diagram of structure one example of the lighting apparatus of expression the present invention the 3rd execution mode.Lighting apparatus shown in Figure 4 and lighting apparatus shown in Figure 3, different on following some.That is, in the lighting apparatus for discharge lamp of lighting apparatus shown in Figure 4, preheating is connected with circuit ground with the centre tap of coil N4, uses between the coil N4 in tie point and the preheating of filament F3a and resistance 42A, and plug-in mounting a capacitor 52.In addition, also have the detection preheating and also will represent that this detected preheating outputs to the coil voltage test section 53 of IC circuit 10b with the coil voltage signal Vk3 of coil voltage with coil voltage with the preheating that produces among the coil N4.Further, IC circuit 10b is according to the electric power quantity delivered of the voltage adjustment that connects error detection occurs signal Vk1, Vk2, Vk3 to discharge lamp La1, La2, La3.
Other structures are identical with lighting apparatus shown in Figure 3, thereby its explanation is omitted, below, describe with regard to the feature of present embodiment.Coil voltage test section 53 has anode and is connected in the diode 54 of preheating with the tie point of coil N4 and capacitor 52.The negative electrode of diode 54 is connected with circuit ground point by resistance 55,57.In addition, capacitor 56 and resistance 57 are connected in parallel.The voltage that produces on the tie point of resistance 55 and resistance 57 outputs to IC circuit 10b as coil voltage signal Vk3.
Below, the action of the lighting apparatus for discharge lamp in the lighting apparatus shown in Figure 4 is described.At first, when high frequency voltage being put on the elementary lateral coil N1 of output transformer 4, produce the voltage corresponding in coil N4, promptly have the voltage of dependency relation each other with its turn ratio separately in a secondary lateral coil N2, preheating by inverter circuit 3.Then, preheating is carried out rectification with the voltage that produces among the coil N4 by diode 54, carries out dividing potential drop by resistance 55,57, and outputs to IC circuit 10b as coil voltage signal Vk3.Therefore, the voltage of coil voltage signal Vk3, and preheating is with having dependency relation between the voltage that produces among the coil N4 too.
Then, the switching frequency that changes switch element 16,21,22 according to the voltage of coil voltage signal Vk3 by IC circuit 10b is adjusted the electric power of discharge lamp is supplied with.
For example, in the lighting apparatus for discharge lamp that can use the roughly the same and modulating voltage of the discharge lamp that is known as " FL36 " known and lamp current and discharge lamp " FL36 " as discharge lamp La1, La2, La3 for its half discharge lamp " FL18 ", when using discharge lamp " FL18 ", the voltage that produces in a secondary lateral coil N2 is roughly half.Therefore, with a secondary lateral coil N2 in voltage with coil voltage signal Vk3 of dependency relation of the voltage that produces be roughly half too.
Therefore, for example, magnitude of voltage between the coil voltage signal Vk3 when reference voltage V ref that will be used to judge the lamp rated value in IC circuit 10b is set at coil voltage signal Vk3 when using discharge lamp " FL36 " and use discharge lamp " FL18 ", and voltage and the reference voltage V ref of coil voltage signal Vk3 are compared by IC circuit 10b, when the voltage of coil voltage signal Vk3 has surpassed reference voltage V ref, be judged as and connecting discharge lamp " FL36 ", and when the voltage of coil voltage signal Vk3 when reference voltage V ref is following, be judged as and connecting discharge lamp " FL18 ".
Then, by IC circuit 10b, connecting discharge lamp " FL36 " and be judged to be the situation that is being connected discharge lamp " FL18 " according to being judged to be as discharge lamp La1, La2, La3, change the switching frequency of switch element 16,21,22 etc., adjusting electric power quantity delivered to discharge lamp, thus the electric power supplied to discharge lamp that will adapt with the lamp rated value of each discharge lamp by voltage conversion circuit 2 and inverter circuit 3.
As mentioned above, lighting apparatus for discharge lamp in the lighting apparatus shown in Figure 4, according to from coil voltage test section 53 output with the preheating that is detected with produce the coil N4 with a secondary lateral coil N2 in the relevant corresponding coil voltage signal Vk3 of preheating usefulness coil voltage of voltage that produces, action by IC circuit 10b control voltage conversion circuit 2 and inverter circuit 3, so, can adjust the quantity delivered of electric power according to the lamp rated value of the discharge lamp that is connecting as discharge lamp La1, La2, La3.
Claims (5)
1. lighting apparatus for discharge lamp, to have at the two ends of each discharge lamp to light and constitute the series circuit that connects with series system by filament is linked together with a plurality of discharge lamps more than three lamps of filament, and have by above-mentioned series circuit supply capability being made the luminous power feeding section of above-mentioned a plurality of discharge lamp, it is characterized in that:
Have be used for detecting the above-mentioned a plurality of filaments that are being connected in series at least one voltage the filament voltage test section,
According to by the action of the above-mentioned power feeding section of the detected voltage control of above-mentioned filament voltage test section so that adjust the control part of the quantity delivered of above-mentioned electric power by the connection status of above-mentioned series circuit,
Above-mentioned filament voltage test section detects its each voltage to the above-mentioned a plurality of filaments that are being connected in series respectively,
Above-mentioned control part, according to the result after will comparing mutually by detected above-mentioned each voltage of above-mentioned filament voltage test section, the connection status that detects above-mentioned series circuit has no abnormal, controls the action of above-mentioned power feeding section simultaneously so that adjust the quantity delivered of above-mentioned electric power.
2. lighting apparatus for discharge lamp according to claim 1 is characterized in that:
Above-mentioned series circuit also has by making electric current flow through the preheat curent circuit that the above-mentioned a plurality of filaments that are being connected in series carry out preheating.
3. lighting apparatus for discharge lamp according to claim 1 and 2 is characterized in that:
Above-mentioned control part, also basis is by detected above-mentioned each voltage of above-mentioned filament voltage test section, judge the discharge lamp number that is being connected in the above-mentioned series circuit, simultaneously according to the action of the above-mentioned power feeding section of discharge lamp numerical control system of this judgement so that adjust the quantity delivered of above-mentioned electric power.
4. lighting apparatus for discharge lamp according to claim 2 is characterized in that:
Above-mentioned power feeding section has the output transformer that is used for an elementary side and the insulation of a secondary side, and simultaneously, put on above-mentioned series circuit by the voltage that produces in the secondary lateral coil with above-mentioned output transformer and supply with above-mentioned electric power,
Above-mentioned preheat curent circuit, also the preheating of the secondary side by being located at above-mentioned output transformer makes electric current flow through the above-mentioned a plurality of filaments that are being connected in series with coil except that an above-mentioned secondary lateral coil,
Also have and be used for detecting above-mentioned preheating produces with coil the preheating relevant coil voltage test section with coil voltage with the voltage that produces in the above-mentioned secondary lateral coil,
Above-mentioned control part also according to by the detected above-mentioned preheating coil voltage of above-mentioned coil voltage test section, is controlled the action of above-mentioned power feeding section so that adjust the quantity delivered of above-mentioned electric power.
5. lighting apparatus has the lighting apparatus for discharge lamp of lighting discharge lamp, to the power supply unit of above-mentioned lighting apparatus for discharge lamp supply capability, it is characterized in that:
Above-mentioned lighting apparatus for discharge lamp is a lighting apparatus for discharge lamp according to claim 1 and 2.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003420761A JP4321254B2 (en) | 2003-12-18 | 2003-12-18 | Discharge lamp lighting device and lighting apparatus equipped with the same |
| JP2003420761 | 2003-12-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1630446A CN1630446A (en) | 2005-06-22 |
| CN100536632C true CN100536632C (en) | 2009-09-02 |
Family
ID=34782192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100314734A Expired - Fee Related CN100536632C (en) | 2003-12-18 | 2004-03-29 | Discharge lamp igniting apparatus and lighting apparatus equipped with same |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4321254B2 (en) |
| CN (1) | CN100536632C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007172892A (en) * | 2005-12-19 | 2007-07-05 | Monokokyuutekkusu Kk | Discharge lamp |
| WO2009062552A1 (en) * | 2007-11-15 | 2009-05-22 | Osram Gesellschaft mit beschränkter Haftung | Apparatus and method for testing of wiring for at least one discharge lamp |
| DE102010029095A1 (en) * | 2010-05-19 | 2011-11-24 | Osram Gesellschaft mit beschränkter Haftung | A control device for a circuit arrangement for operating a light source for setting a first and a second illumination status, system comprising a first circuit arrangement for operating a light source for setting a first and a second illumination status, a second circuit arrangement for operating a discharge lamp and such a control device, and methods for operating a light source for setting a first and a second illumination status |
| KR101818768B1 (en) * | 2010-05-28 | 2018-02-21 | 엘지이노텍 주식회사 | Lamp driving apparatus |
-
2003
- 2003-12-18 JP JP2003420761A patent/JP4321254B2/en not_active Expired - Fee Related
-
2004
- 2004-03-29 CN CNB2004100314734A patent/CN100536632C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005183114A (en) | 2005-07-07 |
| CN1630446A (en) | 2005-06-22 |
| JP4321254B2 (en) | 2009-08-26 |
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Granted publication date: 20090902 Termination date: 20180329 |