CN105101539A - Light-emitting diode (LED) constant current driving circuit - Google Patents
Light-emitting diode (LED) constant current driving circuit Download PDFInfo
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- CN105101539A CN105101539A CN201510408945.1A CN201510408945A CN105101539A CN 105101539 A CN105101539 A CN 105101539A CN 201510408945 A CN201510408945 A CN 201510408945A CN 105101539 A CN105101539 A CN 105101539A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses a light-emitting diode (LED) constant current driving circuit which comprises an alternating current input power supply, a rectification circuit and a constant current control circuit, wherein the rectification circuit is used for receiving the alternating current input power supply and rectifying the alternating current input power supply to obtain a direct current voltage, the constant current control circuit is connected in series with a load and comprises a power switching tube, an output current is adjusted by controlling on and off states of the power switching tube so as to lead the average current passing through the load to keep constant, and a voltage division capacitor is connected in series between the alternating input power supply and the rectification circuit. By connecting the voltage division capacitor in series to an input end, drop voltage at the two ends of the voltage division capacitor is maximum when the power switching tube is switched on, a voltage division effect is achieved, thus, the drop voltage of the power switching tube during switching on is reduced, the switching-on loss of the power switching tube is reduced, and the working efficiency of the circuit is improved.
Description
Technical field
The present invention relates to electric and electronic technical field, be specifically related to a kind of constant current driver circuit for LED.
Background technology
For field of LED illumination, common electric main is as input power, and alternating current input power supplying obtains direct voltage through rectification circuit, and described direct voltage, through voltage transitions, produces constant current and powers to LED load.
The constant current driver circuit for LED of prior art, comprise alternating current input power supplying, rectification circuit and constant-current control circuit, described rectification circuit receives alternating current input power supplying, rectification circuit, to alternating current input power supplying rectification, obtains direct voltage, described constant-current control circuit and load in series, described constant-current control circuit comprises power switch pipe, by controlling the conducting state of power switch pipe, with regulation output electric current, the average current flowing through load is made to keep constant.
In above prior art, described power switch pipe open the difference that pressure drop is input voltage and output voltage, therefore its to open power consumption larger, the efficiency of circuit is very low, and although the pressure drop of opening of power switch pipe can be reduced by the dividing potential drop mode of prior art, but bleeder circuit still exists larger energy consumption, the operating efficiency of circuit fundamentally cannot be improved.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of constant current driver circuit for LED, in order to solve prior art exist open the too high technical problem causing circuit efficiency low of pressure drop.
Technical solution of the present invention is, a kind of constant current driver circuit for LED of following structure is provided, comprise alternating current input power supplying, rectification circuit and constant-current control circuit, described rectification circuit receives alternating current input power supplying, rectification circuit is to alternating current input power supplying rectification, obtain direct voltage, described constant-current control circuit and load in series, described constant-current control circuit comprises power switch pipe, by controlling the conducting state of power switch pipe, with regulation output electric current, the average current flowing through load is made to keep constant;
Derided capacitors is in series with between described alternating current input power supplying and rectification circuit; In positive half period, power switch pipe opens the moment, and the pressure drop at described derided capacitors two ends is positive peak; In negative half-cycle, power switch pipe opens the moment, and the pressure drop at described derided capacitors two ends is negative peak.
Preferably, in positive half period, power switch pipe opens period, and the voltage linear at described derided capacitors two ends declines; In negative half-cycle, power switch pipe opens period, and the voltage linear at described derided capacitors two ends rises.
Preferably, mean value and the described average current flowing through load of described direct voltage keep constant, and the minimum value of described derided capacitors capacitance equals the ratio of the voltage change ratio in described average current and a switch periods.
Preferably, the capacitance of described derided capacitors reduces, and the pressure reduction at derided capacitors two ends increases, and the pressure drop of opening of power switch pipe reduces.
Preferably, described constant-current control circuit sample streams, through the electric current of power switch pipe, obtains the sampled voltage signal characterizing this current value, and compares with reference current signal, exports the control signal for the break-make and conducting state controlling power switch pipe.
Preferably, described constant-current control circuit comprises operational amplifier, two inputs of described sampled voltage signal and reference current signal difference input operational amplifier, and the output of described operational amplifier is connected with the control end of power switch pipe through resistance; In power switch pipe conduction period, it works in linear zone.
Adopt circuit structure of the present invention, compared with prior art, have the following advantages: the present invention to be connected derided capacitors by input, open the moment at power switch pipe, the pressure drop at derided capacitors two ends is positioned at for maximum, serves the effect of dividing potential drop, thus reduce power switch pipe and open the pressure drop of moment on it, thus reduce the turn-on consumption of power switch pipe, while derided capacitors realizes dividing potential drop, consume electric energy hardly, therefore improve the operating efficiency of circuit.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of constant current driver circuit for LED of the present invention;
Fig. 2 is working waveform figure of the present invention;
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, but the present invention is not restricted to these embodiments.The present invention contain any make in the spirit and scope of the present invention substitute, amendment, equivalent method and scheme.
To have the present invention to make the public and understand thoroughly, in the following preferred embodiment of the present invention, describe concrete details in detail, and do not have the description of these details also can understand the present invention completely for a person skilled in the art.
In the following passage, more specifically the present invention is described by way of example with reference to accompanying drawing.It should be noted that, accompanying drawing all adopts the form that comparatively simplifies and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
Shown in figure 1, illustrate the particular circuit configurations of constant current driver circuit for LED of the present invention, comprise alternating current input power supplying Vin, rectification circuit and constant-current control circuit, described rectification circuit receives alternating current input power supplying Vin, rectification circuit is to alternating current input power supplying Vin rectification, obtain direct voltage Vout, described constant-current control circuit and load in series, shunt capacitance C2 in described load.Described constant-current control circuit comprises power switch pipe M, sample streams through the electric current of power switch pipe M, and compares with reference current signal, by controlling the conducting state of power switch pipe M, with regulation output electric current, the average current flowing through load is made to keep constant;
The voltage of load and power switch pipe M common port is Vbus, is in series with derided capacitors C1 between described alternating current input power supplying Vin and rectification circuit; In positive half period, power switch pipe M opens the moment, and the pressure drop at described derided capacitors C1 two ends is positive peak; In negative half-cycle, power switch pipe M opens the moment, and the pressure drop at described derided capacitors C1 two ends is negative peak.
Open the moment at power switch pipe M, what Vbus was power switch pipe M opens pressure drop.The voltage at derided capacitors two ends is Vcap, opens pressure drop Vbus=Vin-Vcap-Vout.Therefore, compared with prior art, due to the dividing potential drop effect of derided capacitors C1, the pressure drop of opening of power switch pipe M obviously reduces, and consumes energy hardly as the derided capacitors C1 of energy-storage travelling wave tube, therefore opens pressure drop by reduction, reduce the turn-on consumption of power switch pipe, improve circuit working efficiency.
Described constant-current control circuit sample streams is through the electric current (being realized by sampling resistor R4) of power switch pipe M, obtain the sampled voltage signal Vsen characterizing this current value, and compare with reference current signal Vref, export the control signal Vctrl for the break-make and conducting state controlling power switch pipe.Constant-current control circuit comprises operational amplifier A, two inputs of described sampled voltage signal Vsen and reference current signal Vref difference input operational amplifier A, and the output of described operational amplifier A is connected with the control end of power switch pipe M through resistance R1; In power switch pipe M conduction period, it works in linear zone.Described sampled voltage signal Vsen is connected to the inverting input of operational amplifier A through resistance R2, described reference current signal Vref is connected to the normal phase input end of operational amplifier through resistance R3.Electric capacity C3 is connected with between the inverting input and output of operational amplifier A.
Shown in figure 2, illustrate the working waveform figure of constant current driver circuit for LED of the present invention, provide alternating current input power supplying Vin, derided capacitors two ends voltage Vcap, open the waveform corresponding relation of pressure drop Vbus and input current Iin.
In positive half period, power switch pipe M opens period, and the voltage Vcap at described derided capacitors C1 two ends linearly declines; In negative half-cycle, power switch pipe M opens period, and the voltage Vcap at described derided capacitors C1 two ends linearly rises.Described positive and negative half period is the power frequency period for alternating current input power supplying.
Mean value and the described average current Iout flowing through load of described direct voltage Vout keep constant, and the minimum value of described derided capacitors capacitance equals the ratio of the voltage change ratio (i.e. the rate of change of voltage Vcap in a switch periods at derided capacitors two ends) in a described average current Iout and switch periods.Available following equation expression: Cmin=Iout/ (dU/dT).
The capacitance of described derided capacitors C1 reduces, and the pressure reduction at derided capacitors two ends increases, and the pressure drop of opening of power switch pipe reduces, and turn-on consumption reduces, and efficiency increases.Otherwise the capacitance of described derided capacitors C1 increases, the pressure reduction at derided capacitors C1 two ends reduces, power switch pipe M opens pressure drop and can increase to some extent, turn-on consumption increases but loss is still significantly less than prior art, and now current phase can be delayed, and power factor increases.Therefore, in actual use, balance can be made between efficiency and power factor, select the derided capacitors C1 of suitable capacitance.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Claims (6)
1. a constant current driver circuit for LED, comprise alternating current input power supplying, rectification circuit and constant-current control circuit, described rectification circuit receives alternating current input power supplying, rectification circuit, to alternating current input power supplying rectification, obtains direct voltage, described constant-current control circuit and load in series, described constant-current control circuit comprises power switch pipe, by controlling the conducting state of power switch pipe, with regulation output electric current, the average current flowing through load is made to keep constant;
It is characterized in that: between described alternating current input power supplying and rectification circuit, be in series with derided capacitors; In positive half period, power switch pipe opens the moment, and the pressure drop at described derided capacitors two ends is positive peak; In negative half-cycle, power switch pipe opens the moment, and the pressure drop at described derided capacitors two ends is negative peak.
2. constant current driver circuit for LED according to claim 1, is characterized in that: in positive half period, and power switch pipe opens period, and the voltage linear at described derided capacitors two ends declines; In negative half-cycle, power switch pipe opens period, and the voltage linear at described derided capacitors two ends rises.
3. constant current driver circuit for LED according to claim 1 and 2, it is characterized in that: mean value and the described average current flowing through load of described direct voltage keep constant, and the minimum value of described derided capacitors capacitance equals the ratio of the voltage change ratio in described average current and a switch periods.
4. constant current driver circuit for LED according to claim 1, is characterized in that: the capacitance of described derided capacitors reduces, and the pressure reduction at derided capacitors two ends increases, and the pressure drop of opening of power switch pipe reduces.
5. constant current driver circuit for LED according to claim 1 and 2, it is characterized in that: described constant-current control circuit sample streams is through the electric current of power switch pipe, obtain the sampled voltage signal characterizing this current value, and compare with reference current signal, export the control signal for the break-make and conducting state controlling power switch pipe.
6. constant current driver circuit for LED according to claim 5, it is characterized in that: described constant-current control circuit comprises operational amplifier, two inputs of described sampled voltage signal and reference current signal difference input operational amplifier, the output of described operational amplifier is connected with the control end of power switch pipe through resistance; In power switch pipe conduction period, it works in linear zone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510408945.1A CN105101539B (en) | 2015-07-13 | 2015-07-13 | Constant current driver circuit for LED |
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| CN201510408945.1A CN105101539B (en) | 2015-07-13 | 2015-07-13 | Constant current driver circuit for LED |
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| CN105101539A true CN105101539A (en) | 2015-11-25 |
| CN105101539B CN105101539B (en) | 2018-06-29 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106973453A (en) * | 2016-01-14 | 2017-07-21 | 立锜科技股份有限公司 | The driving method of light emitting element driving circuit and light-emitting element circuit |
| CN108880252A (en) * | 2018-07-13 | 2018-11-23 | 昂宝电子（上海）有限公司 | Linear constant current circuit |
| CN109348578A (en) * | 2018-10-25 | 2019-02-15 | 杰华特微电子（杭州）有限公司 | Illumination control method, control circuit and lighting system |
| CN109407744A (en) * | 2018-12-03 | 2019-03-01 | 昂宝电子（上海）有限公司 | The linear constant current control system and method for current constant control for load |
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| CN204031524U (en) * | 2014-06-18 | 2014-12-17 | 四川新力光源股份有限公司 | A kind of constant current driver circuit for LED |
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| CN106973453A (en) * | 2016-01-14 | 2017-07-21 | 立锜科技股份有限公司 | The driving method of light emitting element driving circuit and light-emitting element circuit |
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| CN108880252A (en) * | 2018-07-13 | 2018-11-23 | 昂宝电子（上海）有限公司 | Linear constant current circuit |
| CN109348578A (en) * | 2018-10-25 | 2019-02-15 | 杰华特微电子（杭州）有限公司 | Illumination control method, control circuit and lighting system |
| CN109348578B (en) * | 2018-10-25 | 2024-03-22 | 杰华特微电子股份有限公司 | Lighting control method, control circuit and lighting system |
| CN109407744A (en) * | 2018-12-03 | 2019-03-01 | 昂宝电子（上海）有限公司 | The linear constant current control system and method for current constant control for load |
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| CN105101539B (en) | 2018-06-29 |
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Address after: 310051 No. 6 Lianhui Street, Xixing Street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. Address before: 310012 Wensanlu Road, Hangzhou Province, No. 90 East Software Park, science and technology building A1501 Patentee before: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. |
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