CN103108472A - Intermittent service dimming light-emitting diode (LED) lamp drive circuit - Google Patents
Intermittent service dimming light-emitting diode (LED) lamp drive circuit Download PDFInfo
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- CN103108472A CN103108472A CN2013100519254A CN201310051925A CN103108472A CN 103108472 A CN103108472 A CN 103108472A CN 2013100519254 A CN2013100519254 A CN 2013100519254A CN 201310051925 A CN201310051925 A CN 201310051925A CN 103108472 A CN103108472 A CN 103108472A
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Abstract
The invention discloses an intermittent service dimming light-emitting diode (LED) lamp drive circuit. The intermittent service dimming LED lamp drive circuit is arranged between an electronic transformer and an LED lamp and comprises a single chip microcomputer, a rectifier bridge circuit, a boost circuit, an input signal detection circuit, a power circuit, a main electrolytic capacitor voltage detection circuit, an LED voltage detection circuit, a buck drive circuit and a dimming signal reception circuit. The boost circuit with a fixed duty ratio is adopted by a preceding stage of the intermittent service dimming LED lamp drive circuit, an intermittent working mode is adopted to stabilize the main electrolytic capacitor voltage, and start and stop of the boost circuit are carried out on a low frequency envelope valley bottom of the input voltage. Therefore, each time the electronic transformer works, the same current is provided to the load, stable and normal work of the electronic transformer is guaranteed, and no extra circuit loss is added. Besides, only a large electrolytic capacitor instead of an extra expansive element is needed by the circuit, and the aim of meeting requirements can be achieved while cost is barely added.
Description
Technical field
The present invention relates to the LED lamp drive circuit, more particularly, but relate to a kind of LED lamp drive circuit of discontinuous operation pattern of tunable optical of compatible electronic transformer.
Background technology
At present, a lot of LED lamps all require compatible traditional electric supply installation, for example traditional Halogen lamp LED adopts electronic transformer as electric supply installation usually, and the MR16 type LED lamp of replacing Halogen lamp LED also is required the electronic transformer of compatible Halogen lamp LED usually, because the light beam of MR16 shot-light is concentrated, be difficult to be replaced by fluorescent lamp, so adopt the MR16 lamp of LED light source that demand is very widely arranged.But, in prior art, the characteristic impedance difference of LED lamp and traditional Halogen lamp LED is very big, can cause a lot of problems in process with LED lamp replacement Halogen lamp LED, especially the consumed power that insoluble problem is the LED lamp is significantly smaller than traditional Halogen lamp LED, and electronic transformer requires have certain load current just can keep normal work, and the consumed power of LED lamp itself is just far below Halogen lamp LED, light modulation post consumption power is lower in addition, this characteristic is easy to cause when the light modulation of LED lamp to brightness hour, and the problem of glimmering appears in a lot of LED lamps.In order to address this problem, some schemes are the resistive loads that increase a parallel connection to existing LED lamp in order to increasing overall current sinking, can the waste electric energy but do like this, and make the power savings advantages of changing the LED lamp lose meaning.
Summary of the invention
The problem that the job insecurity that occurs for the light-adjustable LED lamp connecting electronic transformer that exists in prior art especially glimmers, the purpose of this invention is to provide a kind of discontinuous operation dimming LED lamp drive circuit, thereby can make the electronic transformer output current keep the certain numerical value steady operation, not cause lowering efficiency and do not increase extra power consumption circuit.
For achieving the above object, the present invention adopts following technical scheme:
A kind of discontinuous operation dimming LED lamp drive circuit is located between electronic transformer and LED lamp, comprising:
Single-chip microcomputer;
Rectifier circuit is connected with the output of electronic transformer, and described high speed rectifier circuit is comprised of the first Schottky diode, the second Schottky diode, the 3rd Schottky diode and the 4th Schottky diode;
The boost booster circuit, its input is connected with the output of described rectifier circuit, and described boost booster circuit comprises the second inductance, the 5th Schottky diode and the first metal-oxide-semiconductor field effect transistor; Described the first metal-oxide-semiconductor field effect transistor is connected with single-chip microcomputer;
Circuit for checking input signals, its input is connected with the output of described rectifier circuit, and described circuit for checking input signals comprises the low pass filter that is comprised of the first resistance and the first electric capacity, and described low pass filter is connected with single-chip microcomputer;
Power circuit, its input is connected with the output of described boost booster circuit, is comprised of linear stabilized power supply and the 6th resistance;
Main electrochemical capacitor voltage detecting circuit and LED voltage detecting circuit, its input is connected with the output of described boost booster circuit, comprises main electrochemical capacitor, is used for the bleeder circuit of single chip computer measurement master electrochemical capacitor voltage and the bleeder circuit that is used for the voltage difference of single chip computer measurement master electrochemical capacitor and LED; Described bleeder circuit for single chip computer measurement master electrochemical capacitor voltage is comprised of the second resistance and the 3rd resistance; The bleeder circuit of described voltage difference for single chip computer measurement master electrochemical capacitor and LED is comprised of the 4th resistance and the 5th resistance;
Buck step-down drive circuit, its input is connected with the output of described boost booster circuit, described buck step-down drive circuit comprises the 3rd inductance, the 6th Schottky diode and the second metal-oxide-semiconductor field effect transistor, and described the second metal-oxide-semiconductor field effect transistor is connected with single-chip microcomputer;
The dim signal receiving circuit comprises phototriode, and described phototriode is connected with the external interrupt pin of single-chip microcomputer;
Wherein, the prime of described discontinuous operation dimming LED lamp drive circuit adopts the boost booster circuit of fixed duty cycle, adopts intermittent duty to stablize main electrochemical capacitor voltage, and opening and closing boost booster circuit carries out in the low frequency envelope the lowest point of input voltage.
The cut-off frequency of described low pass filter is keeping low frequency filtering simultaneously high-frequency signal composition between the high and low frequency signal component of electronic transformer output, phase place and the frequency of low frequency signal are constant.
The cut-off frequency of described low pass filter is 800Hz.
Described single-chip microcomputer carries out to the analog signal of low pass filter output low frequency signal phase place and the frequency information that input supply voltage is obtained in the AD conversion, is used for guaranteeing that the lowest point of opening and be closed in low frequency signal of boost booster circuit carries out.
The interval working duty ratio of described boost booster circuit is controlled by main decomposition voltage, allows to close the boost booster circuit when main electrochemical capacitor voltage reaches capping, allows to open the boost booster circuit under setting in limited time and reach at main electrochemical capacitor voltage.
Described single-chip microcomputer detects main electrochemical capacitor voltage at low side, and single-chip microcomputer detects the poor of main electrochemical capacitor voltage and LED voltage at low side, and single-chip microcomputer obtains LED voltage by calculating, and all voltage detecting are low side and detect.
The power supply of described single-chip microcomputer and described discontinuous operation dimming LED lamp drive circuit is obtained from main electrochemical capacitor by the step-down of linear stabilized power supply through the 6th resistance, has start-up capacitance to provide enough firing currents to single-chip microcomputer and drive circuit when opening.
Described discontinuous operation dimming LED lamp drive circuit also comprises and strengthens the drive current circuit, described enhancing drive current circuit between described boost booster circuit and single-chip microcomputer or/and between described buck step-down drive circuit and single-chip microcomputer; Described enhancing drive current circuit is comprised of positive-negative-positive triode and NPN type triode.Take buck step-down drive circuit as example, buck step-down drive circuit works is at voltage mode, use single-chip microcomputer CCP module to control as driving, drive signal through the buffer circuit that formed by positive-negative-positive triode and NPN type triode to the grid of the second metal-oxide-semiconductor field effect transistor as control signal.
Compared with prior art, adopt a kind of discontinuous operation dimming LED lamp drive circuit of the present invention, can provide same electric current to load during the every task of electronic transformer, can guarantee that namely homeostasis works normally, can not increase extra circuit loss again.Simultaneously, this circuit only need to adopt more relatively large electrochemical capacitor and not need to increase extra expensive device, need increase hardly the purpose that cost can reach to be needed.
Description of drawings
Fig. 1 is the schematic diagram of a kind of discontinuous operation dimming LED lamp drive circuit of the present invention;
Fig. 2 is the circuit diagram of a kind of discontinuous operation dimming LED lamp drive circuit of the present invention.
Embodiment
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing and embodiment.
see also Fig. 1, shown in Figure 2, wherein single-chip microcomputer U1 is STC12C5208AD, and linear stabilized power supply U2 is 78L05, the first Schottky diode D1, the second Schottky diode D2, the 3rd Schottky diode D3, the 4th Schottky diode D4, the 5th Schottky diode D5, the model of the 6th Schottky diode D6 is SS110, and the first inductance L 1 is 2.2uH, and the second inductance L 2 is 10uH, and the 3rd inductance L 3 is 47uH, and the first capacitor C 1 is 10nF, the second capacitor C 2, the 3rd capacitor C 3, the 5th capacitor C 5 is 1uF, and main electrochemical capacitor C4 is 220uF, and the 6th capacitor C 6 is 6.8uF, the first resistance R 1, the 3rd resistance R 3, the 5th resistance R 5 is 1k Ω, and the second resistance R 2 is 10k Ω, and the 4th resistance R 4 is 8.2k Ω, and the 6th resistance R 6 is 2k Ω, NPN type triode Q2, Q5 is NPN transistor 2N5551, positive-negative-positive triode Q3, Q6 is PNP transistor BC817, the first metal-oxide-semiconductor field effect transistor Q4, the second metal-oxide-semiconductor field effect transistor Q7 is field effect transistor FDC5661, and phototriode Q1 is 3DU5C, and fuse F1 is 2A.
In Fig. 2, the first Schottky diode D1, the second Schottky diode D2, the 3rd Schottky diode D3, the 4th Schottky diode D4 form the high speed rectifier bridge, the operating frequency of electronic transformer generally is in 40kHZ between 100kHZ, the rectifier bridge that is comprised of Schottky diode has very high switching speed, and performance is enough to coordinate the electronic transformer normal operation.The first inductance L 1 and the first capacitor C 1 are the EMI filter element, and fuse F1 is protection component.The first resistance R 1 and the first capacitor C 1 form low-pass filter circuit, and the cut-off frequency of circuit is arranged on 800HZ, and this characteristic can guarantee that the high-frequency signal frequency content of filtering electronic transformer keeps its low frequency signal frequency content simultaneously.Low frequency signal frequency content input single-chip microcomputer carries out the AD conversion as temporal information.Phototriode Q1 is connected in single-chip microcomputer external interrupt INT0 pin, can use interrupt mode to send dim signal to single-chip microcomputer.The second inductance L 2, the 5th Schottky diode D5, the first metal-oxide-semiconductor field effect transistor Q4 form the boost circuit, NPN type triode Q2, positive-negative-positive triode Q3 are for strengthening the drive current circuit, adopt the boost circuit can guarantee the continuity of input current, can failure of oscillation thereby make the electronic transformer oscillation circuit keep certain electric current.The driving of circuit at the corresponding levels comes from the CCP module of single-chip microcomputer, and its duty ratio is for what fix, and so each work period can be to the fixing energy of storage capacitor C4 output.The more important thing is, the boost circuit that has fixing duty ratio absorbs stable electric current, and this characteristic can guarantee every low frequency operation cycle output current of electronic transformer size that is consistent, can be because electric current be too small failure of oscillation.The voltage swing of the work acceptor electrochemical capacitor C4 of Boost module is controlled, and sets lower prescribing a time limit when the C4 capacitance voltage drops to, and the boost circuit is started working before the next one cycle of opening of electronic transformer begins.When the capacitance voltage of main electrochemical capacitor C4 rose to capping, the boost circuit quit work.This boost circuit working is at fixed duty cycle, and the discontinuous operation pattern is in order to adapt to electronic transformer work.The 3rd inductance L 3, the 6th Schottky diode D6, the second metal-oxide-semiconductor field effect transistor Q7 form the buck reduction voltage circuit and power to LED.NPN type triode Q5, positive-negative-positive triode Q6 are for strengthening the drive current circuit.Adopt the buck circuit can reduce the ripple current that flows through LED.The driving of circuit at the corresponding levels is equally from the CCP module of single-chip microcomputer, and its working method is the continuously-running duty of variable duty ratio.The light modulation degree that the duty ratio of buck circuit working at the corresponding levels is set by the user, voltage and the LED voltage of main electrochemical capacitor C4 determine jointly.The second resistance R 2 and the 3rd resistance R 3 form bleeder circuits in order to single chip computer measurement master electrochemical capacitor voltage, the 4th R4 and the 5th resistance R 5 form bleeder circuit to the voltage difference of single chip computer measurement master electrochemical capacitor and LED, and the difference of two voltages that measure is LED voltage.The decompression voltage regulator that the 6th resistance R 6 and linear stabilized power supply U2 form provides stable power supply supply for whole operating circuit.The 6th capacitor C 6 act as when starting and provides electric current to single-chip microcomputer.
The overall operation schematic circuit of circuit is that when powering on, electric current is given main electrochemical capacitor C4 charging by the second inductance L 2 and the 5th Schottky diode D5.Due to the existence of the 6th capacitor C 6, when main electrochemical capacitor C4 voltage rose, single-chip microcomputer can obtain enough voltage by 78L05 and start the program.Program is started working after single-chip microcomputer powers on, and because the main electrochemical capacitor C4 voltage ratio that measures is lower, lower than minimum set point 25V, single-chip microcomputer will make the first metal-oxide-semiconductor field effect transistor Q4 work.Program is in order to tackle the starting stage, as main electrochemical capacitor C4 during lower than 25V, no matter has or not to reach electronic transformer output voltage the lowest point, all opens the boost circuit.It is the ceiling capacity that LED section consumes greater than the buck circuit that the Boost level is exported energy backward.The Boost level quits work when main electrochemical capacitor C4 voltage surpasses 45V, until main electrochemical capacitor C4 voltage is again open-minded again during less than 25V, carry out the lowest point that is engraved in input voltage when opening, input voltage waveform can obtain by the AD transformation result of low-pass filter circuit, sets on this basis opening constantly of boost.When main electrochemical capacitor C4 voltage surpassed 25V, the buck circuit was started working.Single-chip microcomputer will read EEPROM and obtain the setting brightness of lamp when cutting off the power supply last time and the magnitude of voltage of LED.The Buck circuit will be according to the brightness value of setting last time, and corresponding the second metal-oxide-semiconductor field effect transistor Q7 duty ratio of the terminal voltage synthetic setting of main electrochemical capacitor C4 voltage and LED.Normal operation was read new LED voltage and regular update by single-chip microcomputer after 2 seconds, and set duty ratio with new LED voltage.The continuous operation always of Buck circuit.During normal operation, main electrochemical capacitor C4 voltage between 45V, can guarantee the normal operation of 78L05 at 25V, and the existence of the 6th resistance R 6 can be protected the safety of 78L05.The user can upgrade the brightness value of lamp by the remote control of phototriode Q1 receiving optical signals, also can realize standby.
Those of ordinary skill in the art will be appreciated that, above embodiment illustrates purpose of the present invention, and be not as limitation of the invention, as long as in essential scope of the present invention, all will drop in the scope of claim of the present invention variation, the modification of the above embodiment.
Claims (8)
1. a discontinuous operation dimming LED lamp drive circuit, be located between electronic transformer and LED lamp, it is characterized in that, comprising:
Single-chip microcomputer;
Rectifier circuit is connected with the output of electronic transformer;
The boost booster circuit, its input is connected with the output of described rectifier circuit, and described boost booster circuit comprises the second inductance, the 5th Schottky diode and the first metal-oxide-semiconductor field effect transistor; Described the first metal-oxide-semiconductor field effect transistor is connected with single-chip microcomputer;
Circuit for checking input signals, its input is connected with the output of described rectifier circuit, and described circuit for checking input signals comprises the low pass filter that is comprised of the first resistance and the first electric capacity, and described low pass filter is connected with single-chip microcomputer;
Power circuit, its input is connected with the output of described boost booster circuit, is comprised of linear stabilized power supply and the 6th resistance;
Main electrochemical capacitor voltage detecting circuit and LED voltage detecting circuit, its input is connected with the output of described boost booster circuit, comprises main electrochemical capacitor, is used for the bleeder circuit of single chip computer measurement master electrochemical capacitor voltage and the bleeder circuit that is used for the voltage difference of single chip computer measurement master electrochemical capacitor and LED; Described bleeder circuit for single chip computer measurement master electrochemical capacitor voltage is comprised of the second resistance and the 3rd resistance; The bleeder circuit of described voltage difference for single chip computer measurement master electrochemical capacitor and LED is comprised of the 4th resistance and the 5th resistance;
Buck step-down drive circuit, its input is connected with the output of described boost booster circuit, described buck step-down drive circuit comprises the 3rd inductance, the 6th Schottky diode and the second metal-oxide-semiconductor field effect transistor, and described the second metal-oxide-semiconductor field effect transistor is connected with single-chip microcomputer;
The dim signal receiving circuit comprises phototriode, and described phototriode is connected with the external interrupt pin of single-chip microcomputer;
Wherein, the prime of described discontinuous operation dimming LED lamp drive circuit adopts the boost booster circuit of fixed duty cycle, adopts intermittent duty to stablize main electrochemical capacitor voltage, and opening and closing boost booster circuit carries out in the low frequency envelope the lowest point of input voltage.
2. discontinuous operation dimming LED lamp drive circuit according to claim 1 is characterized in that:
The cut-off frequency of described low pass filter is keeping low frequency filtering simultaneously high-frequency signal composition between the high and low frequency signal component of electronic transformer output, phase place and the frequency of low frequency signal are constant.
3. discontinuous operation dimming LED lamp drive circuit according to claim 2 is characterized in that:
The cut-off frequency of described low pass filter is 800Hz.
4. discontinuous operation dimming LED lamp drive circuit according to claim 1 is characterized in that:
Described single-chip microcomputer carries out to the analog signal of low pass filter output low frequency signal phase place and the frequency information that input supply voltage is obtained in the AD conversion, is used for guaranteeing that the lowest point of opening and be closed in low frequency signal of b oo s t booster circuit carries out.
5. discontinuous operation dimming LED lamp drive circuit according to claim 1 is characterized in that:
The interval working duty ratio of described boost booster circuit is controlled by main decomposition voltage, allows to close the boost booster circuit when main electrochemical capacitor voltage reaches capping, allows to open the boost booster circuit under setting in limited time and reach at main electrochemical capacitor voltage.
6. discontinuous operation dimming LED lamp drive circuit according to claim 1 is characterized in that:
Described single-chip microcomputer detects main electrochemical capacitor voltage at low side, and single-chip microcomputer detects the poor of main electrochemical capacitor voltage and LED voltage at low side, and single-chip microcomputer obtains LED voltage by calculating, and all voltage detecting are low side and detect.
7. discontinuous operation dimming LED lamp drive circuit according to claim 1 is characterized in that:
The power supply of described single-chip microcomputer and described discontinuous operation dimming LED lamp drive circuit is obtained from main electrochemical capacitor by the step-down of linear stabilized power supply through the 6th resistance, has start-up capacitance to provide enough firing currents to single-chip microcomputer and drive circuit when opening.
8. the described discontinuous operation dimming LED lamp of any one drive circuit according to claim 1 to 7 is characterized in that:
Described discontinuous operation dimming LED lamp drive circuit also comprises and strengthens the drive current circuit, described enhancing drive current circuit between described boost booster circuit and single-chip microcomputer or/and between described buck step-down drive circuit and single-chip microcomputer; Described enhancing drive current circuit is comprised of positive-negative-positive triode and NPN type triode.
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| CN201310051925.4A CN103108472B (en) | 2013-02-17 | 2013-02-17 | Intermittent service dimming light-emitting diode (LED) lamp drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104797048A (en) * | 2015-04-15 | 2015-07-22 | 深圳市通普科技有限公司 | Dimmable LED driving power source and dimmable LED lighting lamp compatible to halogen lamps |
| CN111869328A (en) * | 2017-12-20 | 2020-10-30 | 亮锐有限责任公司 | Dimmer interface with reduced power consumption |
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