CN103957642A - LED power source driving circuit - Google Patents
LED power source driving circuit Download PDFInfo
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- CN103957642A CN103957642A CN201410200121.0A CN201410200121A CN103957642A CN 103957642 A CN103957642 A CN 103957642A CN 201410200121 A CN201410200121 A CN 201410200121A CN 103957642 A CN103957642 A CN 103957642A
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Abstract
The invention provides an LED power source driving circuit which comprises a rectifier circuit and an on-off control circuit. The on-off control circuit comprises a comparator circuit, a trigger circuit and a switching tube. The comparator circuit comprises a first comparator circuit and a second comparator circuit, the positive pole of the first comparator circuit is connected with the positive pole output end of the rectifier circuit, the negative pole of the first comparator circuit is connected with first reference voltage, and the first comparator circuit outputs first comparator voltage which changes periodically; the positive pole of the second comparator circuit is connected with the positive pole output end of the rectifier circuit, the negative pole of the second comparator circuit is connected with second reference voltage, and the second comparator circuit outputs second comparator voltage which changes periodically. The first comparator voltage and the second comparator voltage are connected to the input end of the trigger circuit, the trigger circuit outputs third voltage which changes periodically to control connection and disconnection of the switching tube, charging and discharging of a capacitor are achieved, the positive pole of the capacitor is connected with the positive pole of load, and the negative pole of the capacitor is connected with the negative pole of the load. The circuit structure is simplified, cost is lowered, and the power factor is improved.
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 driving circuit of energy-conserving and environment-protective.
Background technology
For making LED load (lamp pearl) both end voltage substantially remain constant, realize voltage stabilizing, conventional LED power driving circuit is general adopts two kinds of structures, and the one, the drive circuit that adopts as shown in Figure 1 PWM to control, the 2nd, adopt as shown in Figure 2 the power driving circuit of transformer.
From Fig. 1 and Fig. 2, this conventional LED circuit has the components and parts such as transformer and inductance conventionally, certainly will cause circuit volume large, because transformer and inductance have loop construction in practice, in circuit, play the effect that electromagnetism transforms, can produce reactive power, cause power factor low, circuit efficiency is not high.In addition, shown in Fig. 1, the general employing of drive circuit of the switching tube of conventional LED circuit generation PWM is special chip, and price is higher.
Summary of the invention
In order to overcome the defect existing in above-mentioned prior art, the object of this invention is to provide a kind of LED power driving circuit, simplified circuit structure, reduced cost, improved power factor.
In order to realize above-mentioned purpose of the present invention, the invention provides a kind of LED power driving 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 electrode input end of described the first comparison circuit is connected with the cathode output end of rectification circuit, the negative input of described the first comparison circuit connects the first reference voltage, and described the first comparison circuit is exported periodically variable the first comparative voltage; The electrode input end of described the second comparison circuit is connected with the cathode output end of rectification circuit, and the negative input of described the second comparison circuit connects the second reference voltage, and described the second comparison circuit is exported periodically variable the second comparative voltage; Described the first comparative voltage connects an input of circuits for triggering, another input that the second comparative voltage connects circuits for triggering, the output of circuits for triggering is exported 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 discharging and recharging 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 driving circuit of the present invention does not need to use electromagnetic component and the higher driving chips of price such as transformer and inductance, adopts cheap trigger just to realize constant voltage output, has simplified circuit structure, has reduced cost.Do not adopt the components and parts such as transformer and inductance, can reduce circuit volume, in circuit, there is no electromagnetism transformation simultaneously, can not produce reactive power, improved power factor and circuit efficiency.
In a kind of preferred implementation of the present invention, described the first comparison circuit comprises the first comparator, the electrode input end of described the first comparator is connected with the cathode output end of rectification circuit, the negative input of described the first comparison circuit connects the first reference voltage, when the voltage U i of the cathode output end output of rectification circuit is greater than described the first reference voltage V1, described the first comparator output high level, when the voltage U i of the cathode output end output of rectification circuit is less than described the first reference voltage V1, described the first comparator output low level.Thereby form periodically variable the first comparative voltage.
In a kind of preferred implementation of the present invention, described the second comparison circuit comprises the second comparator, the electrode input end of described the second comparator is connected with the cathode output end of rectification circuit, the negative input of described the second comparison circuit connects the second reference voltage, when the voltage U i of the cathode output end output of rectification circuit is less than described the second reference voltage V2, described the second comparator output low level, when the voltage U i of the cathode output end output of rectification circuit is greater than described the second reference voltage V2, described the second comparator output high level.Thereby form periodically variable the second comparative voltage.
In a kind of preferred implementation of the present invention, described the first reference voltage V1 is less than the second reference voltage V2.Thereby make the first comparative voltage different with the duty ratio of the second comparative voltage.
In a kind of preferred implementation of the present invention, described circuits for triggering are rest-set flip-flop, and described the first comparative voltage connects the S input of rest-set flip-flop, the R input that the second comparative voltage connects rest-set flip-flop.Adopt cheap trigger just to realize constant voltage output, simplified circuit structure, reduced cost.
In a kind of preferred implementation of the present invention, described the first comparison circuit comprises the first resistance, the second resistance and the first optical coupler, described the first resistance and the second resistance are connected between two outputs of rectification circuit, the positive pole of the input circuit of described the 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 the first optical coupler is connected to the second output of rectification circuit, the positive pole of the output loop of described the first optical coupler is connected to the first output of rectification circuit, the negative pole of the output loop of described the first optical coupler is connected to the second output of rectification circuit by the 4th resistance.
By the first resistance and the second electric resistance partial pressure, realize the first reference voltage V1, simple in structure.By the first optical coupler, realize the photoelectricity of input and output and isolated, improved safety and reliability.
In a kind of preferred implementation of the present invention, described the second comparison circuit comprises the 5th resistance, the 6th resistance and the second optical coupler, described the 5th resistance and the 6th resistance are connected between two outputs of rectification circuit, the positive pole of the input circuit of described the 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 the second optical coupler is connected to the second output of rectification circuit, the positive pole of the output loop of described the 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 the first optical coupler is connected to the second output of rectification circuit.
By the 6th resistance and the 5th electric resistance partial pressure, realize the second reference voltage V2, simple in structure.By the second optical coupler, realize the photoelectricity of input and output and isolated, improved safety and reliability.
The present invention realizes the first reference voltage by the first resistance and the second electric resistance partial pressure, by the 6th resistance and the 5th electric resistance partial pressure, realize the second reference voltage, adopt closed loop feedback, not only can realize the input of wide cut voltage, the precision of output voltage can be controlled preferably simultaneously, guaranteed that supply voltage is in the situation that fluctuating widely, LED brightness is still stable.
In a kind of preferred implementation of the present invention, described switching tube is field-effect transistor, the negative pole of described the first optical coupler connects the R end of rest-set flip-flop, the positive pole of described the 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, and the break-make by control switch pipe realizes capacitor charge and discharge, realizes voltage stabilizing.
In a kind of preferred implementation of the present invention, also comprise the first diode, described the first diode is connected between the first output of electric capacity and rectification circuit.Prevent that electric current from backflowing, assurance LED lamp pearl is normally worked.
In a kind of preferred implementation of the present invention, also comprise the 3rd resistance and the 7th resistance, one end of described the 3rd resistance connects the positive pole of the input circuit of the first optical coupler, and the other end of described the 3rd resistance is connected on the series circuit between the first resistance and the second resistance; One end of described the 7th resistance connects the positive pole of the input circuit of the second optical coupler, and the other end of described the 7th resistance is connected on the series circuit between the 6th resistance and the 5th resistance.
The 3rd resistance and the 7th resistance carry out current limliting, and assurance circuit is normally worked.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination obviously and is easily understood becoming the description of embodiment, wherein:
Fig. 1 is the circuit diagram of the drive circuit of available technology adopting PWM control;
Fig. 2 is the circuit diagram of the drive circuit of available technology adopting transformer control;
Fig. 3 is the block diagram of LED power driving 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 driving circuit in a kind of preferred implementation of the present invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
In description of the invention, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be interpreted broadly, for example, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be to be directly connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.
The invention provides a kind of LED power driving 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, civil power or other AC power for power acquisition, 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 is exported periodically variable the 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 is exported periodically variable the second comparative voltage; The first comparative voltage connects an input of circuits for triggering, another input that the second comparative voltage connects circuits for triggering, the output of circuits for triggering is exported 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 discharging and recharging 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 driving circuit does not need to use electromagnetic component and the higher driving chips of price such as transformer and inductance, adopt cheap trigger just to realize constant voltage output, simplified circuit structure, reduced cost.Do not adopt the components and parts such as transformer and inductance, can reduce circuit volume, in circuit, there is no electromagnetism transformation simultaneously, can not produce reactive power, improved power factor and circuit efficiency.
As shown in Figure 3, in a kind of preferred implementation of the present invention, the 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 of the cathode output end output of rectification circuit is greater than the first reference voltage V1, the first comparator output high level, when the voltage U i of the cathode output end output of rectification circuit is less than the first reference voltage V1, the first comparator output low level.Thereby form periodically variable the first comparative voltage.
The 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 of the cathode output end output of rectification circuit is less than described the second reference voltage V2, the second comparator output low level, when the voltage U i of the cathode output end output of rectification circuit is greater than described the second reference voltage V2, the second comparator output high level.Thereby form periodically variable the second comparative voltage.
In the present embodiment, the first reference voltage V1 is less than the second reference voltage V2.Thereby 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 that the second comparative voltage connects rest-set flip-flop.Adopt cheap trigger just to realize constant voltage output, simplified circuit structure, reduced 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 rectification circuit becomes direct current Ui by 50Hz AC rectification, as shown in Fig. 4 (a).Direct current Ui produces the little sawtooth waveforms direct voltage of deviation after ON-OFF control circuit at capacitor 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 capacitor C two ends sawtooth waveforms.
According to loading condition, set the value of V1, V2.V1, V2 affect the charging interval of capacitor C, and V1, V2 are larger, and its charging interval is longer.In the present embodiment, V1 and Ui comparison, if Ui is greater than V1, comparator is exported high level, on the contrary output low level, output signal A1 waveform is as shown in Fig. 4 (b).By V2 and Ui comparison, if Ui is greater than V2, comparator output low level, otherwise output high level, signal output waveform A2 is as shown in Fig. 4 (c).A1 signal is received to rest-set flip-flop S end, and A2 signal is received rest-set flip-flop R end, and at output Q output signal A3, 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, capacitor C charging; When A3 signal is low level, S turn-offs, capacitor C electric discharge, and so alternately break-make, makes Uc be sawtooth waveforms and is stabilized near Ud, and 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, the first comparison circuit comprises the first resistance R 1, the second resistance R 2 and the first optical coupler U1, wherein, the first resistance R 1 and the second resistance R 2 are 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 R 1 and the second resistance R 2, 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 R 4.Present embodiment realizes the first reference voltage V1 by the first resistance R 1 and the second resistance R 2 dividing potential drops, simple in structure.By the first optical coupler U1, realize the photoelectricity of input and output and isolated, improved safety and reliability.
In the present embodiment, in circuit, be also provided with the 3rd resistance R 3, one end of the 3rd resistance R 3 connects the positive pole of the input circuit of the first optical coupler U1, the other end of the 3rd resistance R 3 is connected on the series circuit between the first resistance R 1 and the second resistance R 2, carry out current limliting, assurance circuit is normally worked.
In the present embodiment, the second comparison circuit comprises the 5th resistance R 5, the 6th resistance R 6 and the second optical coupler U2, the 5th resistance R 5 and the 6th resistance R 6 are 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 R 5 and the 6th resistance R 6, 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 R 8, the negative pole of the output loop of the first optical coupler U2 is connected to the second output of rectification circuit.Present embodiment realizes the second reference voltage V2 by the 6th resistance R 6 and the 5th resistance R 5 dividing potential drops, simple in structure.By the second optical coupler U2, realize the photoelectricity of input and output and isolated, improved safety and reliability.
In the present embodiment, the one end that is also provided with the 7th resistance R 7, the seven resistance R 7 in circuit connects the positive pole of the input circuit of the second optical coupler U2, and the other end of the 7th resistance R 7 is connected on the series circuit between the 6th resistance R 6 and the 5th resistance R 5.The 7th resistance R 7 is carried out current limliting, and assurance circuit is normally worked.
The present invention realizes the first reference voltage by the first resistance R 1 and the second resistance R 2 dividing potential drops, by the 6th resistance R 6 and the 5th resistance R 5 dividing potential drops, realize the second reference voltage, adopt closed loop feedback, not only can realize the input of wide cut voltage, the precision of output voltage can be controlled preferably simultaneously, guaranteed that supply voltage is in the situation that fluctuating widely, LED brightness is still stable.
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, and the break-make by control switch pipe realizes capacitor charge and discharge, realizes voltage stabilizing.
In another kind of preferred implementation of the present invention, in circuit, be also provided with the first diode D1, the first diode is connected between the first output of electric capacity and rectification circuit, prevents that electric current from backflowing, and assurance LED lamp pearl is normally worked.
In the present embodiment, load circuit comprises LED lamp pearl array, the form that specifically can adopt series connection or series and parallel to combine, capacitance cathode end connects one end of the 9th resistance R 9, the other end of the 9th resistance R 9 connects the positive pole of voltage-stabiliser tube VD, the negative pole of voltage-stabiliser tube VD connects the negative pole of capacitor C, one end of the tenth resistance R 10 connects the negative pole of capacitor 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 pearl array, the positive pole of capacitor C connects the positive pole of LED lamp pearl array.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.
Claims (10)
1. a LED power driving 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 electrode input end of described the first comparison circuit is connected with the cathode output end of rectification circuit, the negative input of described the first comparison circuit connects the first reference voltage, and described the first comparison circuit is exported periodically variable the first comparative voltage;
The electrode input end of described the second comparison circuit is connected with the cathode output end of rectification circuit, and the negative input of described the second comparison circuit connects the second reference voltage, and described the second comparison circuit is exported periodically variable the second comparative voltage;
Described the first comparative voltage connects an input of circuits for triggering, another input that the second comparative voltage connects circuits for triggering, the output of circuits for triggering is exported 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 discharging and recharging 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 driving circuit as claimed in claim 1, it is characterized in that: described the first comparison circuit comprises the first comparator, the electrode input end of described the first comparator is connected with the cathode output end of rectification circuit, the negative input of described the first comparison circuit connects the first reference voltage, when the voltage U i of the cathode output end output of rectification circuit is greater than described the first reference voltage V1, described the first comparator output high level, when the voltage U i of the cathode output end output of rectification circuit is less than described the first reference voltage V1, described the first comparator output low level.
3. LED power driving circuit as claimed in claim 1, it is characterized in that: described the second comparison circuit comprises the second comparator, the electrode input end of described the second comparator is connected with the cathode output end of rectification circuit, the negative input of described the second comparison circuit connects the second reference voltage, when the voltage U i of the cathode output end output of rectification circuit is less than described the second reference voltage V2, described the second comparator output low level, when the voltage U i of the cathode output end output of rectification circuit is greater than described the second reference voltage V2, described the second comparator output high level.
4. the LED power driving circuit as described in claim 1,2, one of 3, is characterized in that: described the first reference voltage V1 is less than the second reference voltage V2.
5. LED power driving circuit as claimed in claim 1, is characterized in that: described circuits for triggering are rest-set flip-flop, and described the first comparative voltage connects the S input of rest-set flip-flop, the R input that the second comparative voltage connects rest-set flip-flop.
6. LED power driving circuit as claimed in claim 1, it is characterized in that: described the first comparison circuit comprises the first resistance, the second resistance and the first optical coupler, described the first resistance and the second resistance are connected between two outputs of rectification circuit, the positive pole of the input circuit of described the 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 the first optical coupler is connected to the second output of rectification circuit, the positive pole of the output loop of described the first optical coupler is connected to the first output of rectification circuit, the negative pole of the output loop of described the first optical coupler is connected to the second output of rectification circuit by the 4th resistance.
7. LED power driving circuit as claimed in claim 1, it is characterized in that: described the second comparison circuit comprises the 5th resistance, the 6th resistance and the second optical coupler, described the 5th resistance and the 6th resistance are connected between two outputs of rectification circuit, the positive pole of the input circuit of described the 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 the second optical coupler is connected to the second output of rectification circuit, the positive pole of the output loop of described the 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 the first optical coupler is connected to the second output of rectification circuit.
8. the LED power driving circuit as described in claim 5,6,7, one of 8, it is characterized in that: described switching tube is field-effect transistor, the negative pole of described the first optical coupler connects the R end of rest-set flip-flop, the positive pole of described the 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.
9. LED power driving circuit as claimed in claim 8, is characterized in that: also comprise the first diode, described the first diode is connected between the first output of electric capacity and rectification circuit.
10. the LED power driving circuit as described in claim 6 or 7, it is characterized in that: also comprise the 3rd resistance and the 7th resistance, one end of described the 3rd resistance connects the positive pole of the input circuit of the first optical coupler, and the other end of described the 3rd resistance is connected on the series circuit between the first resistance and the second resistance; One end of described the 7th resistance connects the positive pole of the input circuit of the second optical coupler, and the other end of described the 7th resistance is connected on the series circuit between the 6th resistance and the 5th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410200121.0A CN103957642B (en) | 2014-05-13 | 2014-05-13 | A kind of LED power drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410200121.0A CN103957642B (en) | 2014-05-13 | 2014-05-13 | A kind of LED power drive circuit |
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| Publication Number | Publication Date |
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| CN103957642A true CN103957642A (en) | 2014-07-30 |
| CN103957642B CN103957642B (en) | 2016-02-17 |
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| CN201410200121.0A Expired - Fee Related CN103957642B (en) | 2014-05-13 | 2014-05-13 | A kind of LED power drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793383A (en) * | 2016-12-05 | 2017-05-31 | 成都小晓学教育咨询有限公司 | A kind of energy-conserving and environment-protective lighting device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070108916A1 (en) * | 2005-11-11 | 2007-05-17 | Ji Wang | LED driving circuit and controlling method thereof |
| 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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2014
- 2014-05-13 CN CN201410200121.0A patent/CN103957642B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070108916A1 (en) * | 2005-11-11 | 2007-05-17 | Ji Wang | LED driving circuit and controlling method thereof |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793383A (en) * | 2016-12-05 | 2017-05-31 | 成都小晓学教育咨询有限公司 | A kind of energy-conserving and environment-protective lighting device |
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| CN103957642B (en) | 2016-02-17 |
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