CN103957642B - A kind of LED power drive circuit - Google Patents
A kind of LED power drive circuit Download PDFInfo
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- CN103957642B CN103957642B CN201410200121.0A CN201410200121A CN103957642B CN 103957642 B CN103957642 B CN 103957642B CN 201410200121 A CN201410200121 A CN 201410200121A CN 103957642 B CN103957642 B CN 103957642B
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Abstract
The present invention proposes a kind of LED power drive circuit, it comprises rectification circuit, ON-OFF control circuit, ON-OFF control circuit comprises comparison circuit, circuits for triggering and switching tube, comparison circuit comprises the first comparison circuit, the second comparison circuit, the positive pole of the first comparison circuit is connected with the cathode output end of rectification circuit, negative pole connects the first reference voltage, and the first comparison circuit exports periodically variable first comparative voltage; The positive pole of the second comparison circuit is connected with the cathode output end of rectification circuit, and negative pole connects the second reference voltage, and the second comparison circuit exports periodically variable second comparative voltage; First comparative voltage, the second comparative voltage connect the input of circuits for triggering, circuits for triggering export conducting and the cut-off of periodically variable tertiary voltage control switch pipe, realize the discharge and recharge of electric capacity, the positive pole of electric capacity connects the positive pole of load, and negative pole connects the negative pole of load.This invention simplifies circuit structure, reduce cost, improve power factor.
Description
Technical field
The present invention relates to a kind of power driving circuit, be specifically related to that a kind of price is low, the LED power drive circuit of energy-conserving and environment-protective.
Background technology
Substantially remain constant for making LED load (lamp pearl) both end voltage, realize voltage stabilizing, conventional LED power drive circuit generally adopts two kinds of structures, and one is the drive circuit adopting PWM to control as shown in Figure 1, and two is the power driving circuits adopting transformer as shown in Figure 2.
From Fig. 1 and Fig. 2, this conventional LED circuit has the components and parts such as transformer and inductance usually, circuit volume certainly will be caused large, because transformer and inductance have loop construction in practice, play the effect of electromagnetic conversion in circuit, can produce reactive power, cause power factor low, circuit efficiency is not high.In addition, what shown in Fig. 1, the drive circuit of the switching tube of conventional LED circuit generation PWM generally adopted is special chip, and price is higher.
Summary of the invention
In order to overcome the defect existed in above-mentioned prior art, the object of this invention is to provide a kind of LED power drive circuit, simplifying circuit structure, reduce cost, improve power factor.
In order to realize above-mentioned purpose of the present invention, the invention provides a kind of LED power drive circuit, it comprises rectification circuit, ON-OFF control circuit, and the input of described rectification circuit is connected with power supply, and the output of described rectification circuit is connected with the input of ON-OFF control circuit; Described ON-OFF control circuit comprises comparison circuit, circuits for triggering and switching tube, and the output of described switching tube is connected with electric capacity; Described comparison circuit comprises the first comparison circuit, the second comparison circuit, the described electrode input end of the first comparison circuit is connected with the cathode output end of rectification circuit, the negative input of described first comparison circuit connects the first reference voltage, and described first comparison circuit exports periodically variable first comparative voltage; The described electrode input end of the second comparison circuit is connected with the cathode output end of rectification circuit, and the negative input of described second comparison circuit connects the second reference voltage, and described second comparison circuit exports periodically variable second comparative voltage; Described first comparative voltage connects an input of circuits for triggering, another input of the second comparative voltage connection circuits for triggering, the output of circuits for triggering exports periodically variable tertiary voltage, the control end of the output connecting valve pipe of circuits for triggering, the conducting of control switch pipe and cut-off, realize the discharge and recharge of electric capacity, the positive pole of described electric capacity connects the positive pole of load, and the negative pole of described electric capacity connects the negative pole of load.
LED power drive circuit of the present invention does not need to use the electromagnetic component such as transformer and inductance and the higher driving chip of price, adopts cheap trigger just to achieve constant voltage and exports, simplify circuit structure, reduce cost.Do not adopt the components and parts such as transformer and inductance, circuit volume can be reduced, there is no electromagnetic conversion effect in circuit simultaneously, can not reactive power be produced, improve power factor and circuit efficiency.
In the preferred embodiment of the present invention, described first comparison circuit comprises the first comparator, the described electrode input end of the first comparator is connected with the cathode output end of rectification circuit, the negative input of described first comparison circuit connects the first reference voltage, when the voltage U i that the cathode output end of rectification circuit exports is greater than described first reference voltage V1, described first comparator exports high level, when the voltage U i that the cathode output end of rectification circuit exports is less than described first reference voltage V1, described first comparator output low level.Thus form periodically variable first comparative voltage.
In the preferred embodiment of the present invention, described second comparison circuit comprises the second comparator, the described electrode input end of the second comparator is connected with the cathode output end of rectification circuit, the negative input of described second comparison circuit connects the second reference voltage, when the voltage U i that the cathode output end of rectification circuit exports is less than described second reference voltage V2, described second comparator output low level, when the voltage U i that the cathode output end of rectification circuit exports is greater than described second reference voltage V2, described second comparator exports high level.Thus form periodically variable second comparative voltage.
In the preferred embodiment of the present invention, described first reference voltage V1 is less than the second reference voltage V2.Thus make the first comparative voltage different with the duty ratio of the second comparative voltage.
In the preferred embodiment of the present invention, described circuits for triggering are rest-set flip-flop, and described first comparative voltage connects the S input of rest-set flip-flop, the R input of the second comparative voltage connection rest-set flip-flop.Adopt cheap trigger just to achieve constant voltage to export, simplify circuit structure, reduce cost.
In the preferred embodiment of the present invention, described first comparison circuit comprises the first resistance, second resistance and the first optical coupler, described first resistance and the second resistant series are between two outputs of rectification circuit, the positive pole of the input circuit of described first optical coupler is connected on the series circuit between the first resistance and the second resistance, the negative pole of the input circuit of described first optical coupler is connected to the second output of rectification circuit, the positive pole of the output loop of described first optical coupler is connected to the first output of rectification circuit, the negative pole of the output loop of described first optical coupler is connected to the second output of rectification circuit by the 4th resistance.
Realize the first reference voltage V1 by the first resistance and the second electric resistance partial pressure, structure is simple.Achieved the Phototube Coupling of input and output by the first optical coupler, improve safety and reliability.
In the preferred embodiment of the present invention, described second comparison circuit comprises the 5th resistance, 6th resistance and the second optical coupler, described 5th resistance and the 6th resistant series are between two outputs of rectification circuit, the positive pole of the input circuit of described second optical coupler is connected on the series circuit between the 5th resistance and the 6th resistance, the negative pole of the input circuit of described second optical coupler is connected to the second output of rectification circuit, the positive pole of the output loop of described second optical coupler is connected to the first output of rectification circuit by the 8th resistance, the negative pole of the output loop of described second optical coupler is connected to the second output of rectification circuit.
Realize the second reference voltage V2 by the 6th resistance and the 5th electric resistance partial pressure, structure is simple.Achieved the Phototube Coupling of input and output by the second optical coupler, improve safety and reliability.
The present invention realizes the first reference voltage by the first resistance and the second electric resistance partial pressure, the second reference voltage is realized by the 6th resistance and the 5th electric resistance partial pressure, adopt closed loop feedback, not only can realize the input of wide cut voltage, the precision of output voltage can be controlled preferably simultaneously, ensure that supply voltage is when fluctuating widely, LED luminance is still stablized.
In the preferred embodiment of the present invention, described switching tube is field-effect transistor, the negative pole of described first optical coupler connects the R end of rest-set flip-flop, the positive pole of described second optical coupler connects the S end of rest-set flip-flop, the Q output of described rest-set flip-flop connects the grid of field-effect transistor, the drain electrode of described field-effect transistor connects the second output of rectification circuit, and the source electrode of described field-effect transistor connects the first output of rectification circuit by electric capacity.
The present invention exports periodically variable tertiary voltage by rest-set flip-flop, realizes capacitor charge and discharge, realize voltage stabilizing by the break-make of control switch pipe.
In the preferred embodiment of the present invention, also comprise the first diode, described first diode is connected between electric capacity and the first output of rectification circuit.Prevent electric current from backflowing, ensure that LED lamp bead normally works.
In the preferred embodiment of the present invention, also comprise the 3rd resistance and the 7th resistance, one end of described 3rd resistance connects the positive pole of the input circuit of the first optical coupler, and the other end of described 3rd resistance is connected on the series circuit between the first resistance and the second resistance; One end of described 7th resistance connects the positive pole of the input circuit of the second optical coupler, and the other end of described 7th resistance is connected on the series circuit between the 6th resistance and the 5th resistance.
3rd resistance and the 7th resistance carry out current limliting, ensure that circuit normally works.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the circuit diagram of the drive circuit adopting PWM to control in prior art;
Fig. 2 is the circuit diagram of the drive circuit adopting transformer to control in prior art;
Fig. 3 is the block diagram of LED power drive circuit in a kind of preferred implementation of the present invention;
Fig. 4 is the oscillogram of each node shown in Fig. 3;
Fig. 5 is the circuit diagram of LED power drive circuit in a kind of preferred implementation of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
In describing the invention, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
The invention provides a kind of LED power drive circuit, it comprises rectification circuit, ON-OFF control circuit, and wherein, the input of rectification circuit is connected with power supply, and the output of rectification circuit is connected with the input of ON-OFF control circuit.In the present embodiment, power acquisition civil power or other AC power, rectification circuit adopts rectifier circuit.
ON-OFF control circuit comprises comparison circuit, circuits for triggering and switching tube, and the output of switching tube is connected with electric capacity.Wherein, comparison circuit comprises the first comparison circuit, the second comparison circuit, the electrode input end of the first comparison circuit is connected with the cathode output end of rectification circuit, and the negative input of the first comparison circuit connects the first reference voltage, and the first comparison circuit exports periodically variable first comparative voltage.The electrode input end of the second comparison circuit is connected with the cathode output end of rectification circuit, and the negative input of the second comparison circuit connects the second reference voltage, and the second comparison circuit exports periodically variable second comparative voltage; First comparative voltage connects an input of circuits for triggering, another input of the second comparative voltage connection circuits for triggering, the output of circuits for triggering exports periodically variable tertiary voltage, the control end of the output connecting valve pipe of circuits for triggering, the conducting of control switch pipe and cut-off, realize the discharge and recharge of electric capacity, the positive pole of electric capacity connects the positive pole of load, and the negative pole of electric capacity connects the negative pole of load.
The present invention makes load both end voltage substantially remain constant, this LED power drive circuit does not need to use the electromagnetic component such as transformer and inductance and the higher driving chip of price, adopt cheap trigger just to achieve constant voltage to export, simplify circuit structure, reduce cost.Do not adopt the components and parts such as transformer and inductance, circuit volume can be reduced, there is no electromagnetic conversion effect in circuit simultaneously, can not reactive power be produced, improve power factor and circuit efficiency.
As shown in Figure 3, in the preferred embodiment of the present invention, first comparison circuit comprises the first comparator, the electrode input end of the first comparator is connected with the cathode output end of rectification circuit, the negative input of the first comparison circuit connects the first reference voltage, when the voltage U i that the cathode output end of rectification circuit exports is greater than the first reference voltage V1, first comparator exports high level, when the voltage U i that the cathode output end of rectification circuit exports is less than the first reference voltage V1, the first comparator output low level.Thus form periodically variable first comparative voltage.
Second comparison circuit comprises the second comparator, the electrode input end of the second comparator is connected with the cathode output end of rectification circuit, the negative input of the second comparison circuit connects the second reference voltage, when the voltage U i that the cathode output end of rectification circuit exports is less than described second reference voltage V2, second comparator output low level, when the voltage U i that the cathode output end of rectification circuit exports is greater than described second reference voltage V2, the second comparator exports high level.Thus form periodically variable second comparative voltage.
In the present embodiment, the first reference voltage V1 is less than the second reference voltage V2.Thus make the first comparative voltage different with the duty ratio of the second comparative voltage.
In the present embodiment, circuits for triggering are rest-set flip-flop, and the first comparative voltage connects the S input of rest-set flip-flop, the R input of the second comparative voltage connection rest-set flip-flop.Adopt cheap trigger just to achieve constant voltage to export, simplify circuit structure, reduce cost.
In the present embodiment, switching tube is field-effect transistor.
As shown in Figure 3, the course of work of this circuit is that 50Hz AC rectification is become direct current Ui, as shown in Fig. 4 (a) by rectification circuit.Direct current Ui produces the little sawtooth waveforms direct voltage of deviation after ON-OFF control circuit at electric capacity C two ends, as shown in Fig. 4 (e).The following describes the operating state of field-effect transistor (MOSFET) and the production process of electric capacity C two ends sawtooth waveforms.
According to loading condition, the value of setting V1, V2.V1, V2 affect the charging interval of electric capacity C, and V1, V2 are larger, and its charging interval is longer.In the present embodiment, V1 and Ui compares, if Ui is greater than V1, then comparator exports high level, on the contrary output low level, and output signal A1 waveform is as shown in Fig. 4 (b).V2 and Ui is compared, if Ui is greater than V2, then comparator output low level, on the contrary exporting high level, signal output waveform A2 is as shown in Fig. 4 (c).A1 signal is received rest-set flip-flop S to hold, A2 signal is received rest-set flip-flop R and is held, and output signal A3 at output Q, waveform is as shown in Fig. 4 (d).Mosfet transistor is used as switch, when A3 signal is high level, and switching tube S conducting, electric capacity C charges; When A3 signal is low level, S turns off, and electric capacity C discharges, so alternately break-make, and make Uc be that sawtooth waveforms is stabilized near Ud, as shown in Fig. 4 (e), wherein, Ud is rated voltage with load.
In another kind of preferred implementation of the present invention, as shown in Figure 5, first comparison circuit comprises the first resistance R1, second resistance R2 and the first optical coupler U1, wherein, first resistance R1 and the second resistance R2 is connected between two outputs of rectification circuit, the positive pole of the input circuit of the first optical coupler U1 is connected on the series circuit between the first resistance R1 and the second resistance R2, the negative pole of the input circuit of the first optical coupler U1 is connected to the second output of rectification circuit, the positive pole of the output loop of the first optical coupler U1 is connected to the first output of rectification circuit, the negative pole of the output loop of the first optical coupler is connected to the second output of rectification circuit by the 4th resistance R4.Present embodiment realizes the first reference voltage V1 by the first resistance R1 and the second resistance R2 dividing potential drop, and structure is simple.Achieved the Phototube Coupling of input and output by the first optical coupler U1, improve safety and reliability.
In the present embodiment, also be provided with the 3rd resistance R3 in circuit, one end of 3rd resistance R3 connects the positive pole of the input circuit of the first optical coupler U1, the other end of the 3rd resistance R3 is connected on the series circuit between the first resistance R1 and the second resistance R2, carry out current limliting, ensure that circuit normally works.
In the present embodiment, second comparison circuit comprises the 5th resistance R5, 6th resistance R6 and the second optical coupler U2, 5th resistance R5 and the 6th resistance R6 is connected between two outputs of rectification circuit, the positive pole of the input circuit of the second optical coupler U2 is connected on the series circuit between the 5th resistance R5 and the 6th resistance R6, the negative pole of the input circuit of the second optical coupler U2 is connected to the second output of rectification circuit, the positive pole of the output loop of the second optical coupler U2 is connected to the first output of rectification circuit by the 8th resistance R8, the negative pole of the output loop of the second optical coupler U2 is connected to the second output of rectification circuit.Present embodiment realizes the second reference voltage V2 by the 6th resistance R6 and the 5th resistance R5 dividing potential drop, and structure is simple.Achieved the Phototube Coupling of input and output by the second optical coupler U2, improve safety and reliability.
In the present embodiment, be also provided with the 7th resistance R7 in circuit, one end of the 7th resistance R7 connects the positive pole of the input circuit of the second optical coupler U2, and the other end of the 7th resistance R7 is connected on the series circuit between the 6th resistance R6 and the 5th resistance R5.7th resistance R7 carries out current limliting, ensures that circuit normally works.
The present invention realizes the first reference voltage by the first resistance R1 and the second resistance R2 dividing potential drop, the second reference voltage is realized by the 6th resistance R6 and the 5th resistance R5 dividing potential drop, adopt closed loop feedback, not only can realize the input of wide cut voltage, the precision of output voltage can be controlled preferably simultaneously, ensure that supply voltage is when fluctuating widely, LED luminance is still stablized.
In the present embodiment, the negative pole of the first optical coupler U1 connects the R end of rest-set flip-flop, the positive pole of the second optical coupler U2 connects the S end of rest-set flip-flop, the Q output of rest-set flip-flop connects the grid of field-effect transistor, the drain electrode of field-effect transistor connects the second output of rectification circuit, and the source electrode of field-effect transistor connects the first output of rectification circuit by electric capacity.The present invention exports periodically variable tertiary voltage by rest-set flip-flop, realizes capacitor charge and discharge, realize voltage stabilizing by the break-make of control switch pipe.
In another kind of preferred implementation of the present invention, be also provided with the first diode D1 in circuit, the first diode is connected between electric capacity and the first output of rectification circuit, prevents electric current from backflowing, and ensures that LED lamp bead normally works.
In the present embodiment, load circuit comprises LED lamp bead array, specifically can adopt the form that series connection or series and parallel combine, capacitance cathode end connects one end of the 9th resistance R9, the other end of the 9th resistance R9 connects the positive pole of voltage-stabiliser tube VD, the negative pole of voltage-stabiliser tube VD connects the negative pole of electric capacity C, one end of tenth resistance R10 connects the negative pole of electric capacity C, the other end connects the drain electrode of voltage stabilizing triode Q2, the grid of voltage stabilizing unipolar tube Q2 connects the positive pole of voltage-stabiliser tube VD, the source electrode of voltage stabilizing triode Q2 connects the negative pole of LED lamp bead array, the positive pole of electric capacity C connects the positive pole of LED lamp bead array.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, those having ordinary skill in the art will appreciate that: can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present invention and aim, scope of the present invention is by claim and equivalents thereof.
Claims (11)
1. a LED power drive circuit, is characterized in that, comprises rectification circuit, ON-OFF control circuit, and the input of described rectification circuit is connected with power supply, and the output of described rectification circuit is connected with the input of ON-OFF control circuit;
Described ON-OFF control circuit comprises comparison circuit, circuits for triggering and switching tube, and the output of described switching tube is connected with electric capacity;
Described comparison circuit comprises the first comparison circuit, the second comparison circuit, the described electrode input end of the first comparison circuit is connected with the cathode output end of rectification circuit, the negative input of described first comparison circuit connects the first reference voltage, and described first comparison circuit exports periodically variable first comparative voltage;
The described electrode input end of the second comparison circuit is connected with the cathode output end of rectification circuit, and the negative input of described second comparison circuit connects the second reference voltage, and described second comparison circuit exports periodically variable second comparative voltage;
Described first comparative voltage connects an input of circuits for triggering, another input of the second comparative voltage connection circuits for triggering, the output of circuits for triggering exports periodically variable tertiary voltage, the control end of the output connecting valve pipe of circuits for triggering, the conducting of control switch pipe and cut-off, realize the discharge and recharge of electric capacity, the positive pole of described electric capacity connects the positive pole of load, and the negative pole of described electric capacity connects the negative pole of load.
2. LED power drive circuit as claimed in claim 1, it is characterized in that: described first comparison circuit comprises the first comparator, the described electrode input end of the first comparator is connected with the cathode output end of rectification circuit, the negative input of described first comparison circuit connects the first reference voltage, when the voltage U i that the cathode output end of rectification circuit exports is greater than described first reference voltage V1, described first comparator exports high level, when the voltage U i that the cathode output end of rectification circuit exports is less than described first reference voltage V1, described first comparator output low level.
3. LED power drive circuit as claimed in claim 1, it is characterized in that: described second comparison circuit comprises the second comparator, the described electrode input end of the second comparator is connected with the cathode output end of rectification circuit, the negative input of described second comparison circuit connects the second reference voltage, when the voltage U i that the cathode output end of rectification circuit exports is less than described second reference voltage V2, described second comparator output low level, when the voltage U i that the cathode output end of rectification circuit exports is greater than described second reference voltage V2, described second comparator exports high level.
4. the LED power drive circuit as described in one of claim 1,2,3, is characterized in that: described first reference voltage V1 is less than the second reference voltage V2.
5. LED power drive circuit as claimed in claim 1, is characterized in that: described circuits for triggering are rest-set flip-flop, and described first comparative voltage connects the S input of rest-set flip-flop, the R input of the second comparative voltage connection rest-set flip-flop.
6. LED power drive circuit as claimed in claim 1, it is characterized in that: described first comparison circuit comprises the first resistance, second resistance and the first optical coupler, described first resistance and the second resistant series are between two outputs of rectification circuit, the positive pole of the input circuit of described first optical coupler is connected on the series circuit between the first resistance and the second resistance, the negative pole of the input circuit of described first optical coupler is connected to the second output of rectification circuit, the positive pole of the output loop of described first optical coupler is connected to the first output of rectification circuit, the negative pole of the output loop of described first optical coupler is connected to the second output of rectification circuit by the 4th resistance.
7. LED power drive circuit as claimed in claim 1, it is characterized in that: described second comparison circuit comprises the 5th resistance, 6th resistance and the second optical coupler, described 5th resistance and the 6th resistant series are between two outputs of rectification circuit, the positive pole of the input circuit of described second optical coupler is connected on the series circuit between the 5th resistance and the 6th resistance, the negative pole of the input circuit of described second optical coupler is connected to the second output of rectification circuit, the positive pole of the output loop of described second optical coupler is connected to the first output of rectification circuit by the 8th resistance, the negative pole of the output loop of described second optical coupler is connected to the second output of rectification circuit.
8. the LED power drive circuit as described in one of claim 5,6,7, it is characterized in that: switching tube is field-effect transistor, the negative pole of the first optical coupler connects the R end of rest-set flip-flop, the positive pole of the second optical coupler connects the S end of rest-set flip-flop, the Q output of rest-set flip-flop connects the grid of field-effect transistor, the drain electrode of described field-effect transistor connects the second output of rectification circuit, and the source electrode of described field-effect transistor connects the first output of rectification circuit by electric capacity.
9. LED power drive circuit as claimed in claim 8, it is characterized in that: also comprise the first diode, described first diode is connected between electric capacity and the first output of rectification circuit.
10. LED power drive circuit as claimed in claim 6, it is characterized in that: also comprise the 3rd resistance, one end of described 3rd resistance connects the positive pole of the input circuit of the first optical coupler, and the other end of described 3rd resistance is connected on the series circuit between the first resistance and the second resistance.
11. LED power drive circuits as claimed in claim 7, it is characterized in that: also comprise the 7th resistance, one end of described 7th resistance connects the positive pole of the input circuit of the second optical coupler, and the other end of described 7th resistance is connected on the series circuit between the 6th resistance and the 5th resistance.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201111757A (en) * | 2009-09-24 | 2011-04-01 | Chia-Li Lin | Device and method for verifying LED by AC power source |
| JP2011108529A (en) * | 2009-11-18 | 2011-06-02 | Phoenix Electric Co Ltd | Power supply circuit for led |
| CN103338563A (en) * | 2013-07-10 | 2013-10-02 | 电子科技大学 | Alternating current LED driving circuit free from influence of power grid fluctuation |
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| CN100576965C (en) * | 2005-11-11 | 2009-12-30 | 王际 | Led drive circuit and control method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201111757A (en) * | 2009-09-24 | 2011-04-01 | Chia-Li Lin | Device and method for verifying LED by AC power source |
| JP2011108529A (en) * | 2009-11-18 | 2011-06-02 | Phoenix Electric Co Ltd | Power supply circuit for led |
| CN103338563A (en) * | 2013-07-10 | 2013-10-02 | 电子科技大学 | Alternating current LED driving circuit free from influence of power grid fluctuation |
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