CN202721879U - LED power supply - Google Patents
LED power supply Download PDFInfo
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- CN202721879U CN202721879U CN 201220396837 CN201220396837U CN202721879U CN 202721879 U CN202721879 U CN 202721879U CN 201220396837 CN201220396837 CN 201220396837 CN 201220396837 U CN201220396837 U CN 201220396837U CN 202721879 U CN202721879 U CN 202721879U
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Abstract
A LED power supply comprises a circulating current transformer, an EMI filter circuit, a rectification circuit, a boost circuit and a PFC control circuit, wherein an input terminal of the transformer is connected with power grid and the transformer is used to reduce and transform an input voltage and then output from an output terminal; the input terminal of the EMI filter circuit is connected with the output terminal of the circulating current transformer; the EMI filter circuit is used to filter an interference of a high frequency pulse of the external power grid to a power supply and the interference of the power supply to the external power grid; the input terminal of the rectification circuit is connected with the output terminal of the EMI filter circuit; the rectification circuit is used to commutate an input alternating current into a pulsating direct current and then output the current from the output terminal; the input terminal of the boost circuit is connected with the output terminal of the rectification circuit; the boost circuit is used to boost and transform an input voltage and then output to a LED module; the input terminal of the PFC control circuit is connected with the output terminal of the rectification circuit; the PFC control circuit is used to collect voltage waveforms of the output terminal of the rectification circuit and adjust a pulse width modulation signal to a driving terminal of the boost circuit so as to drive the boost circuit to output a continuous direct voltage.
Description
Technical field
The utility model relates to the LED lighting field, relates in particular to a kind of LED power supply.
Background technology
Present LED power circuit adopts transformer, rectifier, filter to realize AC-DC conversion mostly, again through boosting or decompression transformation, for the LED luminous tube of some provides driving voltage.The input voltage of common LED power supply is 90-305Vac, when input is higher than 305Vac, transformer heats up, and the voltage transitions Efficiency Decreasing produces larger total harmonic distortion in the circuit, cause that the line power factor descends, have a strong impact on stability and the reliability of output voltage, if improve its voltage transitions efficient and power factor, need customization extraordinary power supply switch tube and rectifying tube, its complex structure, cost is higher.
The utility model content
The technical problems to be solved in the utility model is, a kind of High Power Factor LED power supply simple in structure, with low cost is provided.
For achieving the above object, the utility model adopts following technical scheme.
A kind of LED power supply, it includes a circulation transformer, and its input connects electrical network, is used for exporting from output behind the input voltage decompression transformation; One EMI filter circuit, its input connects the output of described circulation transformer, is used for the high-frequency impulse of the extraneous electrical network of filtering to interference and the to external world interference of electrical network of this power supply of power supply; One rectification circuit, its input connects the output of described EMI filter circuit, and the AC rectification that is used for inputting is to export from output behind the Rectified alternating current; One BOOST booster circuit, its input connects the output of described rectification circuit, is used for exporting the LED module behind the input voltage boosting inverter to; One PFC control circuit, its input connects the output of described rectification circuit, be used for gathering the voltage waveform of described rectification circuit output end, and the output pulse width modulation signal is to the drive end of BOOST booster circuit, to drive the lasting direct voltage of BOOST booster circuit output.
Further, described LED power supply also includes a feedback circuit, and described feedback circuit includes: the first feedback branch, and its input connects the input of LED module, output connects the feedback end of described PFC control circuit, is used for gathering the input voltage signal of LED module; The second feedback branch, its input connects the current circuit of LED module, and output connects the feedback end of described PFC control circuit, is used for gathering the current sampling signal of LED module; The 3rd feedback branch, its input are the temperature sensor of being located in the LED module casing, and output connects the feedback end of described PFC control circuit, are used for gathering the temperature in the LED module.
Further, described PFC control circuit is adjusted the duty ratio of the pulse-width signal of its output according to above-mentioned three kinds of feedback signals.
Further, described feedback circuit also includes discharge circuit, is delivered to described PFC control circuit after the signal that is used for gathering amplifies.
Further, described LED power supply also includes a lower edge switch circuit, and described lower edge switch circuit is used for driving the grid of a metal-oxide-semiconductor, and the source electrode of described metal-oxide-semiconductor and drain electrode are series between LED module and the ground.
Further, described LED power supply also includes an auxiliary power supply circuit, the input of described auxiliary power supply circuit connects the output of described circulation transformer, and its output output 15V direct voltage provides power supply for described PFC control circuit, feedback circuit and lower edge switch circuit.
Further, described auxiliary power supply circuit also is provided with a reference voltage output terminal, and it connects described feedback circuit and provides reference voltage for it.
Further, described rectification circuit is bridge rectifier.
Further, described BOOST booster circuit comprises an inductance, a diode, a metal-oxide-semiconductor and an electric capacity, the first end of described inductance is as the input of described BOOST booster circuit, its the second end connects the positive pole of described diode, the negative pole of described diode is by described capacity earth, the two ends of described electric capacity are the output of BOOST booster circuit, the second end of described inductance also connects the drain electrode of described metal-oxide-semiconductor, the source ground of described metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor are the drive end of BOOST booster circuit 50.
Further, described PFC control circuit is active PFC circuit.
LED power supply of the present utility model, take full advantage of the voltage transitions efficient height that the circulation transformer has, the characteristics that temperature rise is little, be the alternating voltage of characteristic good with the line voltage decompression transformation, this voltage is again through filtering, transfer to the BOOST booster circuit after the rectification, adjusted again the duty ratio of its output pulse width modulation signal according to the feedback signal of feedback circuit by the PFC control circuit, to drive the BOOST booster circuit, make the BOOST booster circuit have the higher output voltage that continues, the PFC control circuit is also proofreaied and correct the power factor of circuit when adjusting duty ratio, reduced total harmonic distortion, made this LED power supply architecture simple, with low cost.
Description of drawings
Fig. 1 is the electrical block diagram of a kind of LED power supply of the utility model.
Fig. 2 is the physical circuit figure of LED power supply one embodiment shown in Figure 1.
Embodiment
In order better to understand the utility model, below in conjunction with drawings and Examples the utility model is done more detailed description.
The utility model discloses a kind of LED power supply, as shown in Figure 1, it includes a circulation transformer 10, an EMI filter circuit 20, a rectification circuit 30, a BOOST booster circuit 50, a PFC control circuit 40, a feedback circuit 60, an auxiliary power supply circuit 80 and a lower edge switch circuit 90.
The input of circulation transformer 10 connects electrical network, and the voltage transitions efficient of circulation transformer 10 is high, temperature rise is little, can bear higher input voltage, line voltage behind circulation transformer 10 decompression transformations, the alternating voltage that output characteristic is good.
The output of the input connecting ring convertor transformer 10 of EMI filter circuit 20, EMI filter circuit 20 utilizes its inner inductance characteristic and capacitance characteristic, can filtering the high-frequency impulse of extraneous electrical network to interference and the to external world interference of electrical network of this power supply of power supply.
The input of rectification circuit 30 connects the output of EMI filter circuit 20, is used for the output ripple direct current.
The input of BOOST booster circuit 50 connects the output of rectification circuit 30, is used for input voltage is carried out boosting inverter, exports continuous higher voltage to LED module 70 from output.
The input of PFC control circuit 40 connects the output of rectification circuit 30, and according to the wave form varies of the Rectified alternating current of its input, the grid of the suitable pulse-modulated signal of output duty cycle metal-oxide-semiconductor Q4 to the BOOST booster circuit 50 is realized continuous boosting to drive BOOST booster circuit 50.
Feedback circuit 60 includes the first feedback branch 61, the second feedback branch 62 and the 3rd feedback branch 63, the input of the first feedback branch 61 connects the input of LED module 70, output connects the feedback end of PFC control circuit 40, is used for gathering the input voltage signal of LED module 70; The input of the second feedback branch 62 connects the current circuit of LED module 70, and output connects the feedback end of PFC control circuit 40, is used for gathering the current sampling signal of LED module 70; The input of the 3rd feedback branch 63 is the temperature sensor of being located in LED module 70 housings, and output connects the feedback end of PFC control circuit 40, is used for gathering the temperature in the LED module.PFC control circuit 40 is adjusted the duty ratio of its output pulse width modulation signal according to this above-mentioned three kinds of feedback signals, makes the output voltage of BOOST booster circuit 50 can be more steady, thus the total harmonic distortion of reduction circuit and to power factor correction.
The output of the input connecting ring convertor transformer 10 of auxiliary power supply circuit 80 is used for output 15V direct voltage, for each chip in the circuit provides power supply, also provides reference voltage VREF for feedback circuit.
The input input external clock pulse signal of lower edge switch circuit 90, its output output drive signal, this signal change to control the ON/OFF action of LED module 70 for the on/off of driven MOS pipe Q5.
Below in conjunction with accompanying drawing 2, the comparatively preferred implementing circuit of the utility model is described.
The input of circulation transformer 10 connects electrical network, and grid alternating current exports EMI filter circuit 20 to after 10 step-downs of circulation transformer, and the voltage transitions efficient of this circulation transformer is high, temperature rise is little, output voltage characteristic good, can bear higher input voltage.
EMI filter circuit 20, it comprises fuse F1, thermistor NTC, the first end of fuse F1 and thermistor NTC is the output of T-Ring convertor transformer 10 respectively, be connected with respectively the input of piezo-resistance RV1, capacitor C X1, resistance R 60, common mode inductance L1 between the second end, the output of common mode inductance L1 connects the input of rectification circuit 30.Utilize the filtering characteristic of common mode inductance L1 and capacitor C X1, the high-frequency impulse of the extraneous electrical network of filtering can pass through the alternating current about 50HZ to interference and the to external world interference of electrical network of this power supply of power supply smoothly.
Rectification circuit 30 is bridge rectifier BR1, is used for the output ripple direct current, and as shown in Figure 2, the output of rectification circuit 30 connects the input of BOOST booster circuit 50, and the output of rectification circuit 30 also connects the input of PFC control circuit 40.
The first end of inductance L 3 is as the input of BOOST booster circuit 50, the second end of inductance L 3 connects the positive pole of diode D5, the negative pole of diode D5 is by capacitor C 8 ground connection, the two ends of capacitor C 8 are the output of BOOST booster circuit, the second end of inductance L 3 also connects the drain electrode of metal-oxide-semiconductor Q4, the source ground of metal-oxide-semiconductor Q4, the grid of metal-oxide-semiconductor Q4 are the drive end of BOOST booster circuit 50.Metal-oxide-semiconductor Q4 conducting is connected inductance L 3 with ground when grid is high level, inductance L 3 energy storage; Metal-oxide-semiconductor Q4 cut-off when grid is low level, inductance L 3 discharges the energy of storage, capacitor C 8 rapid energy storage through the afterflow of diode D5; Metal-oxide-semiconductor Q4 conducting when grid is high level again, inductance L 3 energy storage, capacitor C 8 is slowly discharged; Metal-oxide-semiconductor Q4 cut-off when grid is low level again, inductance L 3 exoergics, capacitor C 8 is fast energy storage again, and at this moment, the voltage at capacitor C 8 two ends has been higher than the input voltage of BOOST booster circuit, thereby realizes the boosting inverter of BOOST booster circuit.Therefore the grid of metal-oxide-semiconductor Q4 need to access lasting pulse signal, to guarantee that the BOOST booster circuit can the higher voltage of continuous wave output.
The control IC of PFC control circuit 40 is NCP1653A, and as shown in Figure 2, its peripheral circuit is set to: 8 pin VCC connect the negative pole of voltage-stabiliser tube Z14, the plus earth of voltage-stabiliser tube Z14, and voltage-stabiliser tube Z14 also is parallel with capacitor C 29 and C39; 6 pin GND ground connection; 5 pin MV are by capacitor C 28 ground connection, and C28 also is parallel with resistance R 48; 2 pin Vcon are by capacitor C 16 ground connection; 3 pin IN are by the resistance R 18 of successively series connection, the positive pole that resistance R 17 is connected to rectification circuit 30 outputs, and 3 pin IN are also by capacitor C 15 ground connection, and the connecting portion of resistance R 18 and resistance R 17 is by capacitor C 14 ground connection; 4 pin CS are connected to the negative pole of rectification circuit 30 outputs by resistance R 47, and 4 pin CS are also by capacitor C 27 ground connection; 1 pin FB is by capacitor C 17 ground connection, and 1 pin FB also connects the output of feedback circuit 70; The first end of 7 pin DRV contact resistance R5, the second end of resistance R 5 connects the negative pole of diode D3, the positive pole of diode D3 connects the grid of metal-oxide-semiconductor Q4,7 pin DRV are the first end of contact resistance R4 also, the second end of resistance R 4 connects the grid of metal-oxide-semiconductor Q4, the grid of metal-oxide-semiconductor Q4 also connects the negative pole of voltage-stabiliser tube Z1, the plus earth of voltage-stabiliser tube Z1, and voltage-stabiliser tube Z1 also is parallel with resistance R 3.3 pin IN and the 4 pin CS of NCP1653A are the voltage detecting end, be used for following the tracks of the variation track of rectification circuit 30 output voltages, adjust the duty ratio of the pulse-width signal of 7 pin DRV output, for the grid of metal-oxide-semiconductor Q4 provides lasting pulse signal driving the continuous high voltage of BOOST booster circuit 50 outputs, and improve the power factor of circuit.
The feedback circuit 60 of this LED power supply comprises three groups of feedback branches, as shown in Figure 2, the first feedback branch 61 is drawn from the input of LED module, and resistance R 30, resistance R 27 by successively series connection are connected to the 1 pin FB of NCP1653A, are used for gathering the voltage signal of LED module 70 inputs.
The sampled signal of the second feedback branch 62 and the 3rd feedback branch 63 is delivered to respectively the 1 pin FB of NCP1653A after discharge circuit amplifies, the operational amplifier of this discharge circuit is LM2902, the 4 pin VCC of LM2902 connect 15V direct current pressure side, the 4 pin VCC of LM2902 also connect the negative pole of voltage-stabiliser tube Z13, the plus earth of voltage-stabiliser tube Z13, voltage-stabiliser tube Z13 also is parallel with capacitor C 9, the 11 pin GND ground connection of LM2902.
This second feedback branch 62 draws and is connected to by resistance R 33 the 3 pin 1IN+ of LM2902 from the first end of resistance R CS, the first end of resistance R CS is also by capacitor C 22 ground connection, capacitor C 22 also is parallel with resistance R 35 resistance R 36, resistance R 37, the 2 pin 1IN-of LM2902 are by resistance R 34 ground connection, 2 pin of LM2902 are the capacitor C 21 by connecting successively also, resistance R 29 is connected to the 1 pin 1OUT of LM2902,2 pin of LM2902 also are connected to the 1 pin 1OUT of LM2902 by resistance R 31, the 1 pin 1OUT of LM2902 also is connected to the negative pole of voltage-stabiliser tube Z13 by capacitor C 20, the 1 pin 1OUT of LM2902 also is connected to the 5 pin 2IN+ of LM2902 by resistance R 23, the 6 pin 2IN-of LM2902 are by resistance R 28 ground connection, the 6 pin 2IN-of LM2902 also connect reference voltage VREF by resistance R 24, the 6 pin 2IN-of LM2902 are the resistance R 21 by connecting successively also, C18 is connected to the 7 pin 2OUT of LM2902, the 7 pin 2OUT of LM2902 also connect the positive pole of diode D4, and the negative pole of diode D4 connects the 1 pin FB of NCP1653A.The second feedback branch 62 is used for gathering the current sampling signal of LED module 70, and this signal carries out being delivered to after two-stage is amplified the 1 pin FB of NCP1653A by operational amplifier LM2902.
The 3rd feedback branch 63 draws and is connected to by resistance R 13 the 12 pin 4IN+ of LM2902 from T-sensor (temperature sensor), the 12 pin 4IN+ of LM2902 are also by resistance R 11 ground connection, the 13 pin 4IN-of LM2092 are by resistance R 14 ground connection, the 13 pin 4IN-of LM2092 also connect reference voltage VREF by resistance R 13, the 13 pin 4IN-of LM2092 also are connected to the 14 pin 4OUT of LM2902 by resistance R 38, the 14 pin 4OUT of LM2902 also connect the positive pole of diode D6, and the negative pole of diode D6 connects the 1 pin FB of NCP1653A.T-sensor (temperature sensor) is positioned in the LED module 70, is used for gathering the temperature in the module and being converted into the signal of telecommunication, is delivered to the 1 pin FB of NCP1653A after this signal amplifies by operational amplifier LM2902.
Feedback circuit 60 is by above-mentioned three feedback branches, after monitoring temperature signal in voltage signal, current sampling signal and the module in LED module 70 circuits processed, feed back to the 1 pin FB of NCP1653A, NCP1653A adjusts the duty ratio of pwm pulse modulation signal according to this feedback signal.
The output of the input connecting ring convertor transformer 10 of auxiliary power supply circuit 80, as shown in Figure 2, the output of the input connection transformer 10 of rectifier BR2, the negative pole of rectifier BR2 output is ground, the first end of the anodal contact resistance R62 of rectifier BR2 output, the second end of resistance R 62 connects the positive pole of capacitor C 13, the minus earth of capacitor C 13, the second end of resistance R 62 also connects the positive pole of capacitor C 11, the minus earth of capacitor C 11, the second end of resistance R 62 is the first end of contact resistance R10 also, the second end of resistance R 10 connects the negative pole of three-terminal voltage-stabilizing pipe U5, the plus earth of three-terminal voltage-stabilizing pipe U5, the reference utmost point of three-terminal voltage-stabilizing pipe U5 is connected with its negative pole, and the second end of resistance R 10 is also by capacitor C 10 ground connection.In this auxiliary power supply circuit 80, the second end of resistance R 62 is 15V direct current pressure side, and for each chip in the circuit provides power supply, the output voltage of three-terminal voltage-stabilizing pipe U5 negative pole is as reference voltage VREF.
The input input external clock pulse signal of lower edge switch circuit 90, as shown in Figure 2, the 1 pin GND ground connection of driver MIC4416; 3 pin VS connect 15V direct current pressure side; 3 pin VS are also by capacitor C 3 ground connection; 4 pin connect 15V direct current pressure side by resistance R 8; 4 pin are the collector electrode of connecting triode Q1 also, the grounded emitter of triode Q1, and the base stage of triode Q1 connects the external clock pulse signal end by resistance R 16, and the base stage of triode Q1 is also by resistance R 16 ground connection; 2 pin G are by resistance R 7, resistance R 9, resistance R 1 ground connection of successively series connection, the connecting portion of resistance R 9, resistance R 1 is the base stage of connecting triode Q2 also, the grounded collector of triode Q2, the connecting portion of resistance R 7, resistance R 9 is the emitter of connecting triode Q2 also, the emitter of triode Q2 also connects the grid of metal-oxide-semiconductor Q5, and the drain electrode of metal-oxide-semiconductor Q5 and source electrode are series between LED module 70 and the resistance R CS as switch terminals.In this lower edge switch circuit 90, by the rising edge triggering of external clock pulse signal, the exportable driving signal of 2 pin G of MIC4416, the on/off of this signal driver metal-oxide-semiconductor Q5 changes to control the ON/OFF action of LED module 70.
LED power supply of the present utility model, take full advantage of the voltage transitions efficient height that the circulation transformer has, the characteristics that temperature rise is little, be the alternating voltage of characteristic good with the line voltage decompression transformation, this voltage is again through filtering, transfer to the BOOST booster circuit after the rectification, adjusted again the duty ratio of its output pulse width modulation signal according to the feedback signal of feedback circuit by the PFC control circuit, to drive the BOOST booster circuit, make the BOOST booster circuit have the higher output voltage that continues, the PFC control circuit is also proofreaied and correct the power factor of circuit when adjusting duty ratio, has reduced total harmonic distortion.LED power supply of the present utility model, its simple in structure, with low cost, good reliability have very large application prospect at the LED lighting field.
The above is the utility model preferred embodiment, is not limited to the utility model, all modifications of making in technical scope of the present utility model, is equal to and replaces or improvement etc., all should be included in the scope that the utility model protects.
Claims (9)
1. a LED power supply is characterized in that, described LED power supply includes:
One circulation transformer, its input connects electrical network, is used for exporting from output behind the input voltage decompression transformation;
One EMI filter circuit, its input connects the output of described circulation transformer, is used for the high-frequency impulse of the extraneous electrical network of filtering to interference and the to external world interference of electrical network of this power supply of power supply;
One rectification circuit, its input connects the output of described EMI filter circuit, and the AC rectification that is used for inputting is to export from output behind the Rectified alternating current;
One BOOST booster circuit, its input connects the output of described rectification circuit, is used for exporting the LED module behind the input voltage boosting inverter to;
One PFC control circuit, its input connects the output of described rectification circuit, be used for gathering the voltage waveform of described rectification circuit output end, and the output pulse width modulation signal is to the drive end of BOOST booster circuit, to drive the lasting direct voltage of BOOST booster circuit output.
2. LED power supply as claimed in claim 1 is characterized in that, described LED power supply also includes a feedback circuit, and described feedback circuit includes:
The first feedback branch, its input connects the input of LED module, and output connects the feedback end of described PFC control circuit, is used for gathering the input voltage signal of LED module;
The second feedback branch, its input connects the current circuit of LED module, and output connects the feedback end of described PFC control circuit, is used for gathering the current sampling signal of LED module;
The 3rd feedback branch, its input are the temperature sensor of being located in the LED module casing, and output connects the feedback end of described PFC control circuit, are used for gathering the temperature in the LED module;
Described PFC control circuit is adjusted the duty ratio of the pulse-width signal of its output according to above-mentioned three kinds of feedback signals.
3. LED power supply as claimed in claim 2 is characterized in that, described feedback circuit also includes discharge circuit, is delivered to described PFC control circuit after the signal that is used for gathering amplifies.
4. LED power supply as claimed in claim 3 is characterized in that, described LED power supply also includes a lower edge switch circuit, and described lower edge switch circuit is used for driving the grid of a metal-oxide-semiconductor, and the source electrode of described metal-oxide-semiconductor and drain electrode are series between LED module and the ground.
5. LED power supply as claimed in claim 4, it is characterized in that, described LED power supply also includes an auxiliary power supply circuit, the input of described auxiliary power supply circuit connects the output of described circulation transformer, and its output output 15V direct voltage provides power supply for described PFC control circuit, feedback circuit and lower edge switch circuit.
6. LED power supply as claimed in claim 5 is characterized in that, described auxiliary power supply circuit also is provided with a reference voltage output terminal, and it connects described feedback circuit and provides reference voltage for it.
7. LED power supply as claimed in claim 1 is characterized in that, described rectification circuit is bridge rectifier.
8. LED power supply as claimed in claim 1, it is characterized in that, described BOOST booster circuit comprises an inductance, a diode, a metal-oxide-semiconductor and an electric capacity, the first end of described inductance is as the input of described BOOST booster circuit, its the second end connects the positive pole of described diode, the negative pole of described diode is by described capacity earth, the two ends of described electric capacity are the output of BOOST booster circuit, the second end of described inductance also connects the drain electrode of described metal-oxide-semiconductor, the source ground of described metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor are the drive end of BOOST booster circuit 50.
9. LED power supply as claimed in claim 1 is characterized in that, described PFC control circuit is active PFC circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220396837 CN202721879U (en) | 2012-08-10 | 2012-08-10 | LED power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220396837 CN202721879U (en) | 2012-08-10 | 2012-08-10 | LED power supply |
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| Publication Number | Publication Date |
|---|---|
| CN202721879U true CN202721879U (en) | 2013-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220396837 Expired - Fee Related CN202721879U (en) | 2012-08-10 | 2012-08-10 | LED power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103313469A (en) * | 2013-04-15 | 2013-09-18 | 浙江生辉照明有限公司 | Driving circuit and driving method for light-emitting diode (LED) illumination device |
| CN109392225A (en) * | 2018-10-22 | 2019-02-26 | 南京博德新能源技术有限公司 | A kind of LED lamp drive circuit reducing output current fluctuation |
| CN112689358A (en) * | 2020-12-30 | 2021-04-20 | 浙江凯耀照明有限责任公司 | BOOST constant current circuit with no-load protection |
-
2012
- 2012-08-10 CN CN 201220396837 patent/CN202721879U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103313469A (en) * | 2013-04-15 | 2013-09-18 | 浙江生辉照明有限公司 | Driving circuit and driving method for light-emitting diode (LED) illumination device |
| CN103313469B (en) * | 2013-04-15 | 2015-12-09 | 浙江生辉照明有限公司 | A kind of drive circuit of LED light device and driving method |
| CN109392225A (en) * | 2018-10-22 | 2019-02-26 | 南京博德新能源技术有限公司 | A kind of LED lamp drive circuit reducing output current fluctuation |
| CN112689358A (en) * | 2020-12-30 | 2021-04-20 | 浙江凯耀照明有限责任公司 | BOOST constant current circuit with no-load protection |
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| CF01 | Termination of patent right due to non-payment of annual fee |