CN105142266A - Dimmable light-emitting diode (LED) drive circuit - Google Patents
Dimmable light-emitting diode (LED) drive circuit Download PDFInfo
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- CN105142266A CN105142266A CN201510467415.4A CN201510467415A CN105142266A CN 105142266 A CN105142266 A CN 105142266A CN 201510467415 A CN201510467415 A CN 201510467415A CN 105142266 A CN105142266 A CN 105142266A
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Abstract
The invention provides a dimmable light-emitting diode (LED) drive circuit, which comprises a main circuit, a control circuit and a receiving control circuit, wherein the main circuit comprises a rectifying circuit and an LED drive module, which are sequentially connected with each other; the control circuit comprises a power supply parameter detection module, auxiliary power supply and a main processor circuit; the receiving control circuit comprises a switch circuit and a drive circuit; the switch circuit is connected between the rectifying circuit and the LED drive module in series; the drive circuit is connected between the switch circuit and the main processor circuit; and the main processor circuit controls the conduction time duty ratio of the main circuit through the receiving control circuit and further adjusts output of the LED drive module. According to the dimmable LED drive circuit, power supply waveform distortion can be removed; dimming within a low power interval is achieved; and the dimmable LED drive circuit can be widely matched with a silicon-controlled dimming switch in the market at present, and has the advantages of being low in cost, free of rewiring, high in adjustment accuracy, fast in response, high in efficiency, small in size, easy to remotely operate and the like.
Description
Technical field
The present invention relates to LED drive circuit field, be specifically related to a kind of LED drive circuit of tunable optical.
Background technology
LED is efficient with it, energy-conservation, technique and by advantages such as material environmental protection, popularize rapidly, because of the relation that LED luminescence and electric current are approximately linear, be well suited for as dimmed light sources, but, if the LED chip adopted is different, its internal wiring structure is different with circuit distribution, its current/voltage parameter is also different, and cause the light source of each production firm to exchange the requirement of optical drive identical, therefore control system does not mate with light source electrical equipment the common fault yet become in industry yet.Control system and lighting apparatus do not match, and may cause lights or flicker, and may cause damage to the drive circuit of LED and light source.Again because control system and lighting apparatus normally separate, product is provided at different decoration stages by different vendor, also relates to the requirement of wiring different therebetween, makes quagmire be difficult to untie.
On market, LED illumination device control mode is varied, in typical dimming LED drive circuit as shown in Figure 1, forward position cut controllable silicon dimmer can be adopted, have with existing line compatible, without the need to rewiring, the advantage such as degree of regulation is high, efficiency is high, cost is low, volume is little, easy remote operation, commercially predominantly, the product of most producer is all this type dimmer.But, the dimming scope of forward position cut controllable silicon light modulation is little, reason is: the maintenance electric current that silicon controlled need of work is certain, when electric current needed for light source is less than maintenance electric current, controllable silicon ends, cause wave distortion, main processor circuit is caused to judge by accident and turn down output, and then cause the further distortion of described waveform, until output is transferred to minimum, controllable silicon ends, along with the capacitor discharge in filter circuit has recovered by receiving the ability of electric current to a certain extent, controlled silicon conducting, once more vicious circle is entered after the of short duration recovery of Circuits System is normal, above process moves in circles and causes light fixture to glimmer.As shown in Figure 2, waveform A is the drive circuit impulse waveform of not carrying out light modulation, and waveform B carries out forward position phase-cut dimming and undistorted drive circuit impulse waveform, and waveform C is the drive circuit impulse waveform of light modulation distortion.
Existing thyristor regulating photosystem is divided into: dimmer switch, the light source electrical equipment be made up of dimming driving circuit and light source assembly, dimming driving circuit is responsible for receiving the supply current from dimmer switch, regulation output is to the drive current of light source simultaneously, when the underconsumption of light source maintains electric current to maintain controllable silicon, stopping light modulation, access power dissipation module, electric energy is consumed to maintain gross output in power dissipation module, thus ensure that controllable silicon maintains electric current to continue light modulation, as shown in Figure 3.Technical scheme disclosed in CN201510148552 is as power dissipation module by the heating of parallel resistance on light source load load, while low-power district adjusts and reduce light source power, maintain gross output by adjusting the heating power consumption increasing ohmic load not decline, the method can obtain ideal dimming effect, but efficiency is lower, and the high temperature caused that generates heat greatly can reduce circuit lifetime.
Summary of the invention
For the problems referred to above, the present invention discloses a kind of Dimmable LED drive circuit, comprises main circuit and control circuit, and described main circuit comprises the rectification circuit, the LED drive module that connect successively; Described rectification circuit is connected with external controllable silicon dimmer, and LED drive module is connected with external LED component; Described control circuit comprises power parameter detection module, accessory power supply, main processor circuit; Described accessory power supply is connected between rectification circuit output end and main processor circuit, main processor circuit by accessory power supply from power supply needed for rectification circuit acquisition work; It is characterized in that: also comprise and received control circuit, describedly comprising the switching circuit be series between LED drive module and rectification circuit and the drive circuit be connected between switching circuit and main processor circuit by receiving control circuit; Described power parameter detection module is connected between rectification circuit output end and main processor circuit, detect the electric parameter of rectification circuit output end and input main processor circuit, main processor circuit controls LED drive module and drive circuit according to the electric parameter that power parameter detection module detects; When power parameter detection module detects that the electric parameter of rectification circuit output end does not meet set point requirement, main processor circuit is by the break-make of drive circuit control switch circuit, the ON time duty ratio of main circuit is controlled, and to described power parameter detection module survey parameter do corresponding choice or compensation adjustment after for controlling the output of LED drive module.
The electric parameter of described rectification circuit output end comprises voltage and the angle of flow.
Preferably, also comprise the EMI filtration module be connected with rectification circuit, external controllable silicon dimmer is connected with rectification circuit by EMI filtration module.
Further, described EMI filtration module take inductance as energy-storage travelling wave tube.
Preferably, in described switching circuit with metal-oxide-semiconductor or triode or controllable silicon for switch element.
Preferably, described rectification circuit is bridge rectifier.
Preferably, main processor circuit is turned off with periodic intervals by drive circuit control switch circuit breaker in middle element, amputation partial pulse, main processor circuit only in switching circuit turn-on cycle received pulse width detection information, and regulates the output of LED drive module accordingly.
Preferably, main processor circuit is turned off with periodic intervals by drive circuit control switch circuit breaker in middle element, paired pulses afterbody implements amputation, and main processor circuit with the pulse duration received by the pulse duration correction of amputation, and regulates the output of LED drive module accordingly.
Preferably, main processor circuit is turned off with periodic intervals by drive circuit control switch circuit breaker in middle element, amputation partial pulse, and amputation is implemented to residual impulse afterbody, main processor circuit only in turn-on cycle received pulse width detection information, and add by after the pulse duration that amputates for regulating the output of LED drive module.
Preferably, main processor circuit controls control switch circuit breaker in middle element by drive circuit and turns off with periodic intervals, amputation partial pulse, and pulse tail amputation is implemented to the part in residual impulse, main processor circuit is only in turn-on cycle received pulse width detection information, by the pulse duration amputated, compensation is added to afterbody, and regulates the output of LED drive module accordingly.
Preferably, control circuit also comprises the load matched regulating circuit be connected with main processor circuit, and load matched regulating circuit can be utilized to carry out manual adjustments, better to mate with different loads.
Preferably, described LED drive module comprises the filter circuit, anti exciting converter, the driver output circuit that connect successively, and filter circuit is connected with switching circuit, driver output circuit with connect LED component and be connected; Filter circuit take electric capacity as energy-storage travelling wave tube, also comprise sample circuit, MOSSFET driver module, sample circuit, MOSSFET driver module are connected between anti exciting converter and main processor circuit side by side, sample circuit carries out sample detecting to the electric parameter of anti exciting converter, and testing result is inputted main processor circuit.
Technical scheme disclosed by the invention, by increasing by receiving control circuit to control the ON time duty ratio of main circuit in Dimmable LED drive circuit, being eliminated supply waveform distortion, being realized the light modulation in low-power interval; Can with thyristor regulating optical switch broad match in the market, and have cost low, without the need to rewiring, the advantage such as degree of regulation is high, response is fast, efficiency is high, volume is little, easy remote operation; And without the need to power dissipation module, obtain desirable dimming effect in more energy-conservation reliable mode, realize the slitless connection of LED light source and existing control system.
Accompanying drawing explanation
Fig. 1 is the theory diagram of existing a kind of typical dimming LED drive circuit.
Fig. 2 is the impulse waveform comparison diagram adopting forward position cut controllable silicon light modulation.
Fig. 3 is the theory diagram of the existing dimming LED drive circuit with power dissipation module.
Fig. 4 is the theory diagram of Dimmable LED drive circuit of the present invention.
Fig. 5 is the oscillogram that the present invention amputates partial pulse.
Fig. 6 is the oscillogram that the present invention amputates pulse tail.
Fig. 7 is that the present invention amputates partial pulse and amputates the oscillogram of pulse tail.
Fig. 8 is the oscillogram that the present invention amputates partial pulse and partial pulse afterbody.
Fig. 9 be can manual adjustment bearing power coupling embodiment theory diagram.
Figure 10 is the embodiment theory diagram that automatically can detect regulating load power match.
Figure 11 is with the embodiment circuit theory diagrams of load matched regulating circuit.
Figure 12 is the embodiment circuit theory diagrams of light-coupled isolation load detecting circuit.
Embodiment
For making those skilled in the art better understand the present invention, below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
As shown in Figure 4, Dimmable LED driving circuit principle block diagram of the present invention, comprises main circuit 1 and control circuit 2, main circuit 1 comprises, rectification circuit 12, LED drive module 6; Control circuit 2 comprises main processor circuit 21, power parameter detection module 22, accessory power supply 23; External controllable silicon dimmer 3 and LED component 4 is also denoted in figure.
Compared to prior art, add in Dimmable LED drive circuit provided by the invention and received control circuit 5, and power parameter detection module 22 is connected between rectification circuit output end and main processor circuit, detects the electric parameter of rectification circuit output end and control the break-make of accessory power supply.Comprise by receiving control circuit 5 switching circuit 51 be series between LED drive module 6 and rectification circuit 12, and be connected to the drive circuit 52 between switching circuit 51 and main processor circuit 21; When power parameter detection module 22 detect the electric parameter of rectification circuit 12 output as voltage and the angle of flow lower than set point time, the break-make of main processor circuit 21 control switch circuit 51, the output pulse of rectification circuit 12 is controlled, the output of a step joint LED drive module 6 of going forward side by side.
Main processor circuit 21 controls by receiving the intermittent electrical connection disconnecting rectification circuit 12 and power to LED drive module 6 of control circuit 5, also namely the ON time duty ratio of main circuit 1 is controlled, during to ensure switching circuit 51 conducting, LED drive module 6 has enough abilities of being received, thus avoids making because load consumption is little LED drive module 6 to be less than controllable silicon and to maintain electric current and then cause the phenomenon of wave distortion to occur by the hard to bear supply current received.Technical scheme provided by the invention be low-power interval with interval but complete waveform power and replace the direct power supply of prior art, avoid the LED flicker because wave distortion causes.
The present invention is received control circuit 5 by increasing, and controls main circuit 1 ON time duty ratio by switching circuit 51, exports pulse and controls, eliminate supply waveform distortion, realize the light modulation in low-power interval rectification circuit.Primary processor mainly contains following two kinds to the control method that rectification circuit exports pulse:
Be illustrated in figure 5 the oscillogram of amputation partial pulse, be merged in less pulse by the electric energy of multiple pulse and send, main processor circuit only in turn-on cycle received pulse width detection information, and regulates anti exciting converter to export accordingly.Due to pulse voltage and width constant, the result of merging is that pulse current increases, thus avoids the cut-off that controllable silicon occurs because of undercurrent.
Fig. 6 is the oscillogram of amputation pulse tail, when the actual measurement pulse of the pulse tail (as shown in Fig. 6 dotted portion) of amputation width △ main processor circuit width W does not afterwards have a distortion, its effect is: be that to be compressed to width be send in the pulse of W for the electric pulse of W+ △ by pulse duration, with electric current during increasing pulse, controllable silicon is avoided to end because undercurrent maintains conducting, main processor circuit is with the actual measurement pulse duration W received by the pulse tail width △ of amputation correction, realize the reduction to controlled silicon conducting width, and regulate anti exciting converter to export accordingly.
Also composition graphs 5, pulse control method shown in Fig. 6 can derive multiple combination, Fig. 7 is amputation partial pulse and amputates the oscillogram of pulse tail, and Fig. 8 is the oscillogram of amputation partial pulse and partial pulse afterbody.
On basis shown in Fig. 4, as shown in Fig. 9 embodiment, in order to mate with different loads better, can increase load matched regulating circuit 26, this circuit is connected with described main processor circuit 21, for manual adjustments load; LED drive module 6 comprises the filter circuit 13, anti exciting converter 14, the driver output circuit 15 that connect successively, and filter circuit 13 is connected with switching circuit 51, driver output circuit 15 with connect LED component 4 and be connected; Filter circuit 13 take electric capacity as energy-storage travelling wave tube, also comprise sample circuit 25, MOSSFET driver module 24, sample circuit 25, MOSSFET driver module 24 are connected between anti exciting converter 14 and main processor circuit 21 side by side, the electric parameter of sample circuit 25 pairs of anti exciting converters 14 carries out sample detecting, and testing result is inputted main processor circuit 21.Its specific embodiment circuit theory diagrams as shown in figure 11.
The drive circuit of Dimmable LED shown in Figure 11 comprises EMI filtration module 11, rectification circuit 12, filter circuit 13, anti exciting converter 14, driver output circuit 15, main processor circuit 21, power parameter detection module 22, accessory power supply 23, MOSFET driver module 24, sample circuit 25; Main processor circuit 21 comprises control chip U1; Rectification circuit 12 adopts bridge rectifier; Dimmable LED drive circuit also comprise be made up of switching circuit 51 and drive circuit 52 received control circuit 5, transformation load match and regulate circuit 26.
Power pulses is after EMI filtration module filtering high-frequency interferencing signal, by rectification circuit 12 rectification, power pulses after rectification is powered to main processor circuit 21 by accessory power supply 23, power parameter detection module 22 detects the electric parameter of the power pulses that rectification circuit 12 exports and inputs in main processor circuit 21, controlled the break-make of accessory power supply 23 by metal-oxide-semiconductor Q4 simultaneously, the parameter that main processor circuit 21 detects according to power parameter detection module 22 and the parameter that sample circuit 25 gathers from anti exciting converter 14, controlled by MOSFET driver module 24 pairs of anti exciting converters 14, the electric pulse that rectification circuit 12 exports is after circuit 13 and anti exciting converter 14 carry out filtering and inverse-excitation converting after filtering, LED component is exported to from driver output circuit 15.
Switching circuit 51 comprises a metal-oxide-semiconductor Q1, drive circuit 52 comprises resistance R10, resistance R11, the S pole ground connection of metal-oxide-semiconductor Q1, D pole is connected to filter circuit, resistance R11 connects the OUTPUT_TR end of control chip in main processor circuit 21, resistance R10 ground connection, and be connected with the G pole of metal-oxide-semiconductor Q1, by the break-make controlling metal-oxide-semiconductor Q1, pulse is exported to rectification circuit 12 and control. simultaneouslyLoad matched regulating circuit 26 comprises a resistance R20 and R21 and electric capacity C1 in parallel with R20, one end of R20 and R21 connects earth terminal and VCC end respectively, the other end is held with the VT of control chip in main processor circuit 21 simultaneously and is connected, and reaches the object of adjustment coupling by the proportioning of R20 and R21 in load matched regulating circuit 26 in adjustment.
The difference of the drive circuit of Dimmable LED shown in Figure 10, Figure 12 and Fig. 9, Figure 11 is, do not adopt load matched regulating circuit 26, and adopt light-coupled isolation load detecting module 27 to be connected with main processor circuit 21 and driver output circuit 15 respectively, for detecting load information, main processor circuit 21 is Detection Information Auto-matching accordingly.Light-coupled isolation load detecting module 27 comprises resistance R31, resistance R32, resistance R33, resistance R34, resistance R35, electric capacity C2, light-emitting diode D1, triode Q2 and triode Q3, light-emitting diode D1 is as the emission part of optocoupler, one end of described 5 resistance is all connected with the cathode output end of driver output circuit 15, the other end of resistance R31 is successively by light-emitting diode D1, electric capacity C2 is connected to the base stage of triode Q3, the other end of resistance R33 is also connected with the base stage of triode Q3, the other end of resistance R32 is connected with the collector electrode of triode Q2, the other end of resistance R34 is connected with the base stage of triode Q2, the other end of resistance R35 is connected with the collector electrode of triode Q3, electric capacity C3 is connected between triode Q2 base stage and triode Q3 collector electrode, the grounded emitter of triode Q2 and triode Q3. also comprise photodiode D2 in main processor circuit 21, photodiode D2 is as the acceptance division of optocoupler, be connected between the VT end of control chip in main processor circuit 21 and ground.Light-coupled isolation load detecting module 27 and main processor circuit 21 accessible site are on an ic.
Claims (10)
1. a Dimmable LED drive circuit, comprises main circuit and control circuit, and described main circuit comprises the rectification circuit, the LED drive module that connect successively; Described rectification circuit is connected with external controllable silicon dimmer, and LED drive module is connected with external LED component; Described control circuit comprises power parameter detection module, accessory power supply, main processor circuit; Described accessory power supply is connected between rectification circuit output end and main processor circuit, main processor circuit by accessory power supply from power supply needed for rectification circuit acquisition work; It is characterized in that: also comprise and received control circuit, describedly comprising the switching circuit be series between LED drive module and rectification circuit and the drive circuit be connected between switching circuit and main processor circuit by receiving control circuit; Described power parameter detection module is connected between rectification circuit output end and main processor circuit, detect the electric parameter of rectification circuit output end and input main processor circuit, main processor circuit controls LED drive module and drive circuit according to the electric parameter that power parameter detection module detects; When power parameter detection module detects that the electric parameter of rectification circuit output end does not meet set point requirement, main processor circuit is by the break-make of drive circuit control switch circuit, the ON time duty ratio of main circuit is controlled, and to described power parameter detection module survey parameter do corresponding choice or compensation adjustment after for controlling the output of LED drive module.
2. according to a kind of Dimmable LED drive circuit described in claim 1, it is characterized in that: also comprise the EMI filtration module be connected with rectification circuit, external controllable silicon dimmer is connected with rectification circuit by EMI filtration module.
3., according to a kind of Dimmable LED drive circuit described in claim 2, it is characterized in that: described EMI filtration module take inductance as energy-storage travelling wave tube.
4., according to a kind of Dimmable LED drive circuit described in claim 1, it is characterized in that: in described switching circuit with metal-oxide-semiconductor or triode or controllable silicon for switch element.
5., according to a kind of Dimmable LED drive circuit described in claim 1, it is characterized in that: described rectification circuit is bridge rectifier.
6. according to a kind of Dimmable LED drive circuit described in claim 1, it is characterized in that: main processor circuit is turned off with periodic intervals by drive circuit control switch circuit breaker in middle element, the partial pulse that amputation rectification circuit exports, main processor circuit only in switching circuit turn-on cycle received pulse width detection information, and regulates the output of LED drive module accordingly.
7. according to a kind of Dimmable LED drive circuit described in claim 1, it is characterized in that: main processor circuit is turned off with periodic intervals by drive circuit control switch circuit breaker in middle element, paired pulses afterbody implements amputation, main processor circuit with the pulse duration received by the pulse duration correction of amputation, and regulates the output of LED drive module accordingly.
8. according to a kind of Dimmable LED drive circuit described in claim 1, it is characterized in that: main processor circuit is turned off with periodic intervals by drive circuit control switch circuit breaker in middle element, the partial pulse that amputation rectification circuit exports, and amputation is implemented to residual impulse afterbody, main processor circuit only in turn-on cycle received pulse width detection information, and add by after the pulse duration that amputates for regulating the output of LED drive module.
9. according to described a kind of Dimmable LED drive circuit described in claim 1, it is characterized in that: main processor circuit controls control switch circuit breaker in middle element by drive circuit and turns off with periodic intervals, the partial pulse that amputation rectification circuit exports, and pulse tail amputation is implemented to the part in residual impulse, main processor circuit is only in turn-on cycle received pulse width detection information, by the pulse duration amputated, compensation is added to afterbody, and regulates the output of LED drive module accordingly.
10. according to a kind of Dimmable LED drive circuit described in claim 1, it is characterized in that: described control circuit also comprises the load matched regulating circuit be connected with main processor circuit, load matched regulating circuit can be utilized to carry out manual adjustments, better to mate with different loads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510467415.4A CN105142266A (en) | 2015-08-03 | 2015-08-03 | Dimmable light-emitting diode (LED) drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510467415.4A CN105142266A (en) | 2015-08-03 | 2015-08-03 | Dimmable light-emitting diode (LED) drive circuit |
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| CN105142266A true CN105142266A (en) | 2015-12-09 |
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| CN201510467415.4A Pending CN105142266A (en) | 2015-08-03 | 2015-08-03 | Dimmable light-emitting diode (LED) drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106535409A (en) * | 2016-12-03 | 2017-03-22 | 河池学院 | Constant current switching power supply system for LED illumination |
| CN116394763A (en) * | 2023-06-07 | 2023-07-07 | 武汉嘉晨电子技术有限公司 | Battery pack safety protection system |
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| CN102478195A (en) * | 2010-11-29 | 2012-05-30 | 陈家德 | Light-emitting lamp fitting based on hybrid power supply as well as hybrid power supply device and method thereof |
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2015
- 2015-08-03 CN CN201510467415.4A patent/CN105142266A/en active Pending
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| CN102478195A (en) * | 2010-11-29 | 2012-05-30 | 陈家德 | Light-emitting lamp fitting based on hybrid power supply as well as hybrid power supply device and method thereof |
| WO2014126392A1 (en) * | 2013-02-14 | 2014-08-21 | Jang Min Jun | Power supply circuit for altering flickering frequency of light-emitting diode |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106535409A (en) * | 2016-12-03 | 2017-03-22 | 河池学院 | Constant current switching power supply system for LED illumination |
| CN116394763A (en) * | 2023-06-07 | 2023-07-07 | 武汉嘉晨电子技术有限公司 | Battery pack safety protection system |
| CN116394763B (en) * | 2023-06-07 | 2023-10-03 | 武汉嘉晨电子技术有限公司 | Battery pack safety protection system |
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Effective date of registration: 20170210 Address after: 516006 Guangdong city of Huizhou province Hui Tai Industrial Zone No. 63 district (Hengxin company plant) a building Applicant after: Huizhou Qirui Electric Co., Ltd. Address before: No. 63 building B Hui Taiwan Industrial Zone 516000 in Guangdong province Huizhou City Zhongkai high tech Zone Applicant before: Chen Tao |
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Application publication date: 20151209 |