CN203416464U - Novel LED driving circuit - Google Patents
Novel LED driving circuit Download PDFInfo
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- CN203416464U CN203416464U CN201320403431.3U CN201320403431U CN203416464U CN 203416464 U CN203416464 U CN 203416464U CN 201320403431 U CN201320403431 U CN 201320403431U CN 203416464 U CN203416464 U CN 203416464U
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Abstract
The utility model provides a novel LED driving circuit. The circuit comprises a rectification filter circuit, a clamping circuit, a flyback transformer, a main control circuit and an output circuit. According to the novel LED driving circuit of the utility model, a valley-filled circuit is added in the rectification filter circuit so that a current can be input smoothly and an effect of increasing a power factor is achieved; a safety capacitor is added after the valley-filled circuit so as to reduce high-frequency signals and harmonic waves in the circuit; the whole circuit reduces ripple interferences brought by a power grid; the power factor is effectively increased and an interference of EMI is reduced.
Description
Technical field
The utility model relates to semiconductor lighting electronic technology field, is specifically related to a kind of New LED driving power.
Background technology
LED light-emitting diode has the superior features such as energy-conserving and environment-protective, high light efficiency, long-life, replaces gradually traditional lighting light fixture, becomes illuminations of new generation.Due to the characteristics of luminescence of LED, higher to the stability requirement of the voltage and current of power supply circuits, the drive circuit that meets LED voltage-current characteristic need to be designed and the normal operation of LED light fixture could be allowed, so just can give full play of its superior illumination performance.Because the voltage ratio in electrical network is more unstable, harmonic current is many, is unfavorable for the normal operation of LED, and the lower meeting of the power factor of light fixture affect utilization rate of electrical, the load loss that can increase electrical network, a large amount of low power factor electrical equipment can make electric power transfer cost greatly increase.In LED illumination, by today of being popularized in a large number, design and develop out a kind of high efficiency, High Power Factor, low noise LED drive circuit and become more and more urgent.
Summary of the invention
In view of this, the utility model provides the New LED drive circuit of a kind of high efficiency, High Power Factor and electric current and voltage stable output.
For realizing above object, the utility model is by the following technical solutions: a kind of New LED drive circuit, this LED drive circuit comprises current rectifying and wave filtering circuit, clamp circuit, flyback transformer, main control circuit and output circuit, wherein, described current rectifying and wave filtering circuit input receives ac input signal, after ac input signal rectifying and wave-filtering, by output output, arrange filtered signal;
Described flyback transformer comprises armature winding, auxiliary winding and secondary winding, the first end of described armature winding is connected with the output of described current rectifying and wave filtering circuit, the second end of described armature winding is connected with the output of described clamp circuit, and the second end of described auxiliary winding is connected to ground;
Described clamp circuit, has the input being connected with described rectification filter circuit output end, and the first output and the second output that are connected with the second end with the first end of armature winding in described flyback transformer;
Described main control circuit has the confession electrical input being connected with described rectification filter circuit output end, the pressure feedback port being connected with described auxiliary winding first end, the earth terminal being connected with described auxiliary winding the second end;
Described output circuit receives the output signal of secondary winding, and this output signal is carried out exporting for driving the driving signal of an above LED lamp after filter rectification.
Further, described current rectifying and wave filtering circuit comprises fuse, piezo-resistance, filter inductance, rectifier bridge and fills out paddy circuit, wherein, the first end of described fuse is connected with the first input end of described current rectifying and wave filtering circuit, and the second end of described fuse is connected with the first end of piezo-resistance; The first end of described filter inductance is connected with the second input of described current rectifying and wave filtering circuit, and the second end of described filter inductance is connected with the second end of piezo-resistance; Described rectifier bridge and fill out and be also provided with the 5th diode between paddy circuit; Described rectifier bridge is comprised of four diodes, and wherein, the negative pole of the first described diode is connected with the positive pole of the second diode and the first end of described piezo-resistance; The negative pole of the negative pole of described the second diode and described the 3rd diode is connected with the positive pole of the 5th diode; The negative pole of the positive pole of described the 3rd diode and described the 4th diode is connected with the second end of described piezo-resistance; The described paddy circuit of filling out comprises the 6th to the 8th diode, the first electric capacity, the second electric capacity and the first resistance, and wherein, the first end of the first described electric capacity is connected with the negative pole of described the 5th diode with the negative pole of the 8th diode; The positive pole of the negative pole of the 6th diode and described the 7th diode is connected with the second end of the first electric capacity; The negative pole of the 7th diode is connected with the first end of described the first resistance; The second end of the first resistance is connected with the positive pole of described the 8th diode with the first end of the second electric capacity; In described current rectifying and wave filtering circuit, be also provided with the 3rd electric capacity, the first end of described the 3rd electric capacity is connected with the negative pole of the 8th diode; The positive pole anodal and the 4th diode of the positive pole of the second end of the 3rd electric capacity, the second end of the second electric capacity, the 6th diode, the first diode is all connected to ground.
Further, described clamp circuit comprises the 4th electric capacity, the 4th resistance and the tenth diode, and described clamp circuit is by series opposing the tenth diode after the 4th electric capacity and the 4th resistance parallel connection, specific as follows:
The first end of described the 4th electric capacity and the 4th resistance is connected with the first end of the 3rd electric capacity in described current rectifying and wave filtering circuit, the first end of described the 4th electric capacity and the 4th resistance is also connected with the first end of armature winding in described flyback transformer simultaneously, the 4th described electric capacity is connected with the negative pole of described the tenth diode with the second end of the 4th resistance, and the positive pole of described the tenth diode is connected with the second end of armature winding in described flyback transformer.
Further, described main control circuit comprises the second resistance, the 3rd resistance, the 5th resistance to the nine resistance, the 9th diode, the 5th electric capacity and pulse width modulating chip, and wherein said pulse width modulating chip comprises, PCC pin, peak current compensation end; FB pin, feedback voltage input; VCC pin, power supply; ISEN pin, peak current sampling end; OC1 pin, high pressure NPN pipe C end; 0C2 pin, high pressure NPN pipe C end; GND pin, chip benchmark ground.
Further, the concrete syndeton of described main control circuit is as follows:
Described PCC pin is connected with the second end of the 7th resistance, and described the 7th first end of resistance and the first end of described auxiliary winding are connected;
Described FB pin is connected with the first end of the 6th resistance with the second end of the 5th resistance, and described the 5th first end of resistance and the first end of described auxiliary winding are connected, and the second end connection of described the 6th resistance falls down to the ground;
Described VCC pin is connected with the second end of the 3rd resistance, and the first end of the 3rd resistance is connected with the second end of the second resistance, and the first end of the second resistance is connected with the first end of the 3rd electric capacity;
Described ISEN pin is connected with the first end of the 8th resistance, described the 8th resistance the second end, the first end of the 5th electric capacity and the first end of the 9th resistance are all connected to ground, and the second end of the second end of described the 5th electric capacity and the 9th resistance is connected with the second end of the 3rd resistance;
Described OC1 pin is connected with the second end of described armature winding;
Described OC2 pin is connected with the second end of described armature winding;
Described GND pin is connected with the second end of described auxiliary winding.
Further, described output circuit comprises RC absorbing circuit and output filter circuit, and wherein, described RC absorbing circuit comprises the tenth resistance, the 6th electric capacity and the 11 diode, described output filter circuit comprises the 7th electric capacity and the 11 resistance, and concrete syndeton is as follows:
The first end of described the tenth resistance is connected with the 11 first end of diode and the first end of described secondary winding, the second end of described the tenth resistance is connected with the first end of the 6th electric capacity, the second end of the 6th electric capacity is connected with the first end of the 7th electric capacity with the second end of the 11 diode, the first end of described the 11 resistance is connected as the first output of described output circuit with the first end of the 7th electric capacity, and the second end of described the 11 resistance is connected as the second output of described output circuit with the second end of the 7th electric capacity, the second end of secondary winding.
Further, this LED drive circuit is also provided with the 8th electric capacity between described flyback transformer and described output circuit, the first end of the 8th electric capacity is connected with the second end of the 7th electric capacity in described output circuit, and the second end of the 8th electric capacity is connected with the second end of auxiliary winding in described flyback transformer.
The utility model adopts above technical scheme, at the input of circuit, adopts fuse to prevent that electric current moment from becoming large, and piezo-resistance prevents that input voltage from suddenly increasing suddenly and playing filter action; Alternating current, through filling out the further phase angle of voltage and electric current of paddy circuit by one after rectifier bridge rectification, improves power factor, then is the 3rd electric capacity filtering high-frequency signal through safety electric capacity; In the utility model main control circuit, adopt the micro-SD6955 chip of Silan, built-in high pressure resistant metal-oxide-semiconductor, by controlling the duty cycle adjustment high frequency transformer of pwm signal, control output voltage, and prevent transformer instant high-voltage injury metal-oxide-semiconductor by a clamping protective circuit; The auxiliary winding of transformer provides feedback voltage electric current, regulates the duty ratio of the PWM ripple of Master control chip generation, plays the effect of constant pressure and flow; A RC absorbing circuit being formed by the tenth resistance and the 6th electric capacity in parallel on the 11 diode in output circuit, be used for the spike signal of absorbing circuit, the negative pole of output is connected with the ground of main control circuit by the 8th electric capacity, is conducive to reduce the EMI of circuit.The utility model design circuit is simple, components and parts are few, overall cost is lower, and the design has High Power Factor, low noise, efficiency compared with high, Master control chip built-in voltage current feedback testing circuit, makes the electric current and voltage of LED drive circuit output comparatively stable.
Accompanying drawing explanation
Fig. 1 is the utility model LED drive circuit structural representation;
Fig. 2 is the utility model LED drive circuit flyback transformer internal structure schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail:
As depicted in figs. 1 and 2, a kind of New LED drive circuit that the utility model provides, this LED drive circuit comprises current rectifying and wave filtering circuit 1, clamp circuit 3, flyback transformer 4, main control circuit 2 and output circuit 5, wherein, described current rectifying and wave filtering circuit 1 input receives ac input signal, after ac input signal rectifying and wave-filtering, by output output, arrange filtered signal;
Described flyback transformer 4 comprises armature winding W1, auxiliary winding W3 and secondary winding W2, the first end of described armature winding W1 is connected with the output of described current rectifying and wave filtering circuit 1, the second end of described armature winding W1 is connected with the output of described clamp circuit 3, and the second end of described auxiliary winding W3 is connected to ground;
Fig. 2 is the present embodiment LED drive circuit flyback transformer internal structure schematic diagram, and the first end pin1 of armature winding W1 is connected with the first end of the 4th resistance R 4, and the second end pin2 is connected with the positive pole of the tenth diode D10; The first end pin5 of auxiliary winding W3 is connected with the first end of the 7th resistance R 7, the second end pin4 ground connection; The first end pin10 of secondary winding W2 is connected with the positive pole of the 11 diode D11, the second end pin6 ground connection.
Described clamp circuit 3, has the input being connected with described current rectifying and wave filtering circuit 1 output, and the first output and the second output that are connected with the second end with the first end of armature winding W1 in described flyback transformer 4;
Described main control circuit 5 has the confession electrical input being connected with described current rectifying and wave filtering circuit 1 output, the pressure feedback port being connected with described auxiliary winding W3 first end, the earth terminal being connected with described auxiliary winding W3 the second end;
Described output circuit receives the output signal of secondary winding W2, and this output signal is carried out exporting for driving the driving signal of an above LED lamp after filter rectification.
Described current rectifying and wave filtering circuit 1 comprises fuse FR, in the present embodiment, described fuse FR is resistance-type fuse, piezo-resistance RV, filter inductance L1, rectifier bridge U2 and fills out paddy circuit, wherein, the first end of described fuse FR is connected with the first input end L (live wire signal) of described current rectifying and wave filtering circuit 1, and the second end of described fuse FR is connected with the first end of piezo-resistance RV; The first end of described filter inductance L1 is connected with the second input N (zero line signal) of described current rectifying and wave filtering circuit 1, and the second end of described filter inductance L1 is connected with the second end of piezo-resistance RV; Described rectifier bridge U2 and fill out and be also provided with the 5th diode D5 between paddy circuit; Described rectifier bridge U2 is comprised of four diodes, and wherein, the negative pole of the first described diode D1 is connected with the second positive pole of diode D2 and the first end of described piezo-resistance RV; The negative pole of the negative pole of described the second diode D2 and described the 3rd diode D3 is connected with the positive pole of the 5th diode D5; The negative pole of the positive pole of described the 3rd diode D3 and described the 4th diode D4 is connected with the second end of described piezo-resistance RV; The described paddy circuit of filling out comprises the 6th to the 8th diode (D6 to D8), the first capacitor C 1, the second capacitor C 2 and the first resistance R 1, wherein, the first end of the first described capacitor C 1 and the negative pole of the 8th diode D8 are connected with the negative pole of described the 5th diode D5; The positive pole of the negative pole of the 6th diode D6 and described the 7th diode D7 is connected with the second end of the first capacitor C 1; The negative pole of the 7th diode D7 is connected with the first end of described the first resistance R 1; The second end of the first resistance R 1 is connected with the positive pole of described the 8th diode D8 with the first end of the second capacitor C 2; In described current rectifying and wave filtering circuit 1, be also provided with the 3rd capacitor C 3, the first end of described the 3rd capacitor C 3 is connected with the negative pole of the 8th diode D8; The positive pole anodal and the 4th diode D4 of the second end of the second end of the 3rd capacitor C 3, the second capacitor C 2, the positive pole of the 6th diode D6, the first diode D1 is all connected to ground.
In the present embodiment, described clamp circuit 3 comprises the 4th capacitor C 4, the 4th resistance R 4 and the tenth diode D10, and described clamp circuit 1 is by the 4th capacitor C 4 and the 4th resistance R 4 rear series opposing the tenth diode D10 in parallel, specific as follows:
The first end of described the 4th capacitor C 4 and the 4th resistance R 4 is connected with the first end of the 3rd capacitor C 3 in described current rectifying and wave filtering circuit 1, the first end of described the 4th capacitor C 4 and the 4th resistance R 4 is also connected with the first end of armature winding in described flyback transformer 4 simultaneously, the 4th described capacitor C 4 is connected with the negative pole of described the tenth diode D10 with the second end of the 4th resistance R 4, and the positive pole of described the tenth diode D10 is connected with the second end of armature winding in described flyback transformer 4.
In the present embodiment, described main control circuit 10 comprises the second resistance R 2, the 3rd resistance R, the 5th resistance to the nine resistance (R5 to R9), the 9th diode D9, the 5th capacitor C 5 and pulse width modulating chip U1, wherein said pulse width modulating chip U1 comprises, PCC pin, peak current compensation end; FB pin, feedback voltage input; VCC pin, power supply; ISEN pin, peak current sampling end; OC1 pin, high pressure NPN pipe C end; 0C2 pin, high pressure NPN pipe C end; GND pin, chip benchmark ground.
The concrete syndeton of main control circuit is as follows:
Described PCC pin is connected with the second end of the 7th resistance R 7, and the first end of described the 7th resistance R 7 is connected with the first end of described auxiliary winding W3;
Described FB pin is connected with the first end of the 6th resistance R 6 with the second end of the 5th resistance R 5, and the first end of described the 5th resistance R 5 is connected with the first end of described auxiliary winding W3, and the second end connection of described the 6th resistance R 6 falls down to the ground;
Described VCC pin is connected with the second end of the 3rd resistance R 3, and the first end of the 3rd resistance R 3 is connected with the second end of the second resistance R 2, and the first end of the second resistance R 2 is connected with the first end of the 3rd capacitor C 3;
Described ISEN pin is connected with the first end of the 8th resistance R 8, described the 8th resistance R 8 second ends, the first end of the 5th capacitor C 5 and the first end of the 9th resistance R 9 are all connected to ground, and the second end of the second end of described the 5th capacitor C 5 and the 9th resistance R 9 is connected with the second end of the 3rd resistance R 3;
Described OC1 pin is connected with the second end of described armature winding W1;
Described OC2 pin is connected with the second end of described armature winding W1;
Described OC1 pin can be connected separately use with described OC2 pin, also can connect use simultaneously, when connecting use, can increase ampacity simultaneously, improve heat-sinking capability.
Described GND pin is connected with the second end of described auxiliary winding W3.
In the present embodiment, described output circuit 5 comprises RC absorbing circuit and output filter circuit, wherein, described RC absorbing circuit comprises the tenth resistance R 10, the 6th capacitor C 6 and the 11 diode D11, described output filter circuit comprises the 7th capacitor C 7 and the 11 resistance R 11, and concrete syndeton is as follows:
Described the tenth first end of resistance R 10 and the first end of the 11 diode D11 are connected with the first end of described secondary winding W2, the second end of described the tenth resistance R 10 is connected with the first end of the 6th capacitor C 6, the second end of the 6th capacitor C 6 is connected with the first end of the 7th capacitor C 7 with the second end of the 11 diode R10, the first end of described the 11 resistance R 11 is connected with the first end of the 7th capacitor C 7 as the first output LED+ of described output circuit, the second end of the second end of described the 11 resistance R 11 and the 7th capacitor C 7, the second end of secondary winding W2 is connected as the second output LED-of described output circuit.
In order further to reduce EMI (electromagnetic interference), this LED drive circuit is also provided with the 8th capacitor C 8 between described flyback transformer 4 and described output circuit 5, the first end of the 8th capacitor C 8 is connected with the second end of the 7th capacitor C 7 in described output circuit 5, and the second end of the 8th capacitor C 8 is connected with the second end of auxiliary winding W3 in described flyback transformer 4.
At the input of circuit, adopt fuse FR to prevent that electric current moment from becoming large, piezo-resistance RV prevents that input voltage from suddenly increasing suddenly and playing filter action; Alternating current, through filling out the further phase angle of voltage and electric current of paddy circuit by one after rectifier bridge rectification, improves power factor, then is the 3rd capacitor C 3 filtering high-frequency signals through safety electric capacity; In the utility model main control circuit, adopt the micro-SD6955 chip of Silan, built-in high pressure resistant metal-oxide-semiconductor, by controlling the duty cycle adjustment high frequency transformer of pwm signal, control output voltage, and prevent transformer instant high-voltage injury metal-oxide-semiconductor by a clamping protective circuit; Transformer auxiliary winding W3 provide feedback voltage electric current, regulates the duty ratio of the PWM ripple of Master control chip generation, plays the effect of constant pressure and flow; The upper RC absorbing circuit being formed by the tenth resistance R 10 and the 6th capacitor C 6 in parallel of the 11 diode D11 in output circuit, be used for the spike signal of absorbing circuit, the negative pole of output is connected with the ground of main control circuit by the 8th capacitor C 8, is conducive to reduce the EMI of circuit.The utility model design circuit is simple, components and parts are few, overall cost is lower, and the design has High Power Factor, low noise, efficiency compared with high, Master control chip built-in voltage current feedback testing circuit, makes the electric current and voltage of LED drive circuit output comparatively stable.
Detailed description by above execution mode, wish more to know description feature of the present utility model, if those skilled in the art carries out various changes and distortion to the utility model, belong to the utility model claim and equivalent technologies scope thereof, the utility model also comprises these changes and distortion.
Claims (7)
1. a New LED drive circuit, is characterized in that: this LED drive circuit comprises current rectifying and wave filtering circuit, clamp circuit, flyback transformer, main control circuit and output circuit, wherein,
Described current rectifying and wave filtering circuit input receives ac input signal, after ac input signal rectifying and wave-filtering, by output output, arranges filtered signal;
Described flyback transformer comprises armature winding, auxiliary winding and secondary winding, the first end of described armature winding is connected with the output of described current rectifying and wave filtering circuit, the second end of described armature winding is connected with the output of described clamp circuit, and the second end of described auxiliary winding is connected to ground;
Described clamp circuit, has the input being connected with described rectification filter circuit output end, and the first output and the second output that are connected with the second end with the first end of armature winding in described flyback transformer;
Described main control circuit has the confession electrical input being connected with described rectification filter circuit output end, the pressure feedback port being connected with described auxiliary winding first end, the earth terminal being connected with described auxiliary winding the second end;
Described output circuit receives the output signal of secondary winding, and this output signal is carried out exporting for driving the driving signal of an above LED lamp after filter rectification.
2. New LED drive circuit according to claim 1, is characterized in that: described current rectifying and wave filtering circuit comprises fuse, piezo-resistance, filter inductance, rectifier bridge and fill out paddy circuit, wherein,
The first end of described fuse is connected with the first input end of described current rectifying and wave filtering circuit, and the second end of described fuse is connected with the first end of piezo-resistance;
The first end of described filter inductance is connected with the second input of described current rectifying and wave filtering circuit, and the second end of described filter inductance is connected with the second end of piezo-resistance;
Described rectifier bridge and fill out and be also provided with the 5th diode between paddy circuit;
Described rectifier bridge is comprised of four diodes, and wherein, the negative pole of the first described diode is connected with the positive pole of the second diode and the first end of described piezo-resistance; The negative pole of the negative pole of described the second diode and described the 3rd diode is connected with the positive pole of the 5th diode; The negative pole of the positive pole of described the 3rd diode and described the 4th diode is connected with the second end of described piezo-resistance;
The described paddy circuit of filling out comprises the 6th to the 8th diode, the first electric capacity, the second electric capacity and the first resistance, and wherein, the first end of the first described electric capacity is connected with the negative pole of described the 5th diode with the negative pole of the 8th diode; The positive pole of the negative pole of the 6th diode and described the 7th diode is connected with the second end of the first electric capacity; The negative pole of the 7th diode is connected with the first end of described the first resistance; The second end of the first resistance is connected with the positive pole of described the 8th diode with the first end of the second electric capacity;
In described current rectifying and wave filtering circuit, be also provided with the 3rd electric capacity, the first end of described the 3rd electric capacity is connected with the negative pole of the 8th diode;
The positive pole anodal and the 4th diode of the positive pole of the second end of the 3rd electric capacity, the second end of the second electric capacity, the 6th diode, the first diode is all connected to ground.
3. New LED drive circuit according to claim 1, it is characterized in that: described clamp circuit comprises the 4th electric capacity, the 4th resistance and the tenth diode, described clamp circuit is by series opposing the tenth diode after the 4th electric capacity and the 4th resistance parallel connection, specific as follows:
The first end of described the 4th electric capacity and the 4th resistance is connected with the first end of the 3rd electric capacity in described current rectifying and wave filtering circuit, the first end of described the 4th electric capacity and the 4th resistance is also connected with the first end of armature winding in described flyback transformer simultaneously, the 4th described electric capacity is connected with the negative pole of described the tenth diode with the second end of the 4th resistance, and the positive pole of described the tenth diode is connected with the second end of armature winding in described flyback transformer.
4. New LED drive circuit according to claim 1, it is characterized in that: described main control circuit comprises the second resistance, the 3rd resistance, the 5th resistance to the nine resistance, the 9th diode, the 5th electric capacity and pulse width modulating chip, wherein said pulse width modulating chip comprises, PCC pin, peak current compensation end; FB pin, feedback voltage input; VCC pin, power supply; ISEN pin, peak current sampling end; OC1 pin, high pressure NPN pipe C end; 0C2 pin, high pressure NPN pipe C end; GND pin, chip benchmark ground.
5. New LED drive circuit according to claim 4, is characterized in that: the concrete syndeton of described main control circuit is as follows:
Described PCC pin is connected with the second end of the 7th resistance, and described the 7th first end of resistance and the first end of described auxiliary winding are connected;
Described FB pin is connected with the first end of the 6th resistance with the second end of the 5th resistance, and described the 5th first end of resistance and the first end of described auxiliary winding are connected, and the second end connection of described the 6th resistance falls down to the ground;
Described VCC pin is connected with the second end of the 3rd resistance, and the first end of the 3rd resistance is connected with the second end of the second resistance, and the first end of the second resistance is connected with the first end of the 3rd electric capacity;
Described ISEN pin is connected with the first end of the 8th resistance, described the 8th resistance the second end, the first end of the 5th electric capacity and the first end of the 9th resistance are all connected to ground, and the second end of the second end of described the 5th electric capacity and the 9th resistance is connected with the second end of the 3rd resistance;
Described OC1 pin is connected with the second end of described armature winding;
Described OC2 pin is connected with the second end of described armature winding;
Described GND pin is connected with the second end of described auxiliary winding.
6. New LED drive circuit according to claim 1, it is characterized in that: described output circuit comprises RC absorbing circuit and output filter circuit, wherein, described RC absorbing circuit comprises the tenth resistance, the 6th electric capacity and the 11 diode, described output filter circuit comprises the 7th electric capacity and the 11 resistance, and concrete syndeton is as follows:
The first end of described the tenth resistance is connected with the 11 first end of diode and the first end of described secondary winding, the second end of described the tenth resistance is connected with the first end of the 6th electric capacity, the second end of the 6th electric capacity is connected with the first end of the 7th electric capacity with the second end of the 11 diode, the first end of described the 11 resistance is connected as the first output of described output circuit with the first end of the 7th electric capacity, and the second end of described the 11 resistance is connected as the second output of described output circuit with the second end of the 7th electric capacity, the second end of secondary winding.
7. New LED drive circuit according to claim 1, it is characterized in that: this LED drive circuit is also provided with the 8th electric capacity between described flyback transformer and described output circuit, the first end of the 8th electric capacity is connected with the second end of the 7th electric capacity in described output circuit, and the second end of the 8th electric capacity is connected with the second end of auxiliary winding in described flyback transformer.
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| CN201320403431.3U CN203416464U (en) | 2013-07-08 | 2013-07-08 | Novel LED driving circuit |
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|---|---|---|---|
| CN201320403431.3U CN203416464U (en) | 2013-07-08 | 2013-07-08 | Novel LED driving circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104159357A (en) * | 2014-06-20 | 2014-11-19 | 东南大学 | Method and system for controlling output current effective value and power factor of LED lighting circuit |
| CN109496016A (en) * | 2018-12-25 | 2019-03-19 | 福州大学 | A kind of High Power Factor LED drive power low-frequency ripple suppressing method |
| CN109618451A (en) * | 2018-12-12 | 2019-04-12 | 上思县东岽电子科技有限责任公司 | A kind of LED street lamp with guidance isolated high voltage function |
-
2013
- 2013-07-08 CN CN201320403431.3U patent/CN203416464U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104159357A (en) * | 2014-06-20 | 2014-11-19 | 东南大学 | Method and system for controlling output current effective value and power factor of LED lighting circuit |
| CN104159357B (en) * | 2014-06-20 | 2016-03-30 | 东南大学 | The control method of a kind of LED illumination circuit output current effective value and power factor and control system thereof |
| CN109618451A (en) * | 2018-12-12 | 2019-04-12 | 上思县东岽电子科技有限责任公司 | A kind of LED street lamp with guidance isolated high voltage function |
| CN109496016A (en) * | 2018-12-25 | 2019-03-19 | 福州大学 | A kind of High Power Factor LED drive power low-frequency ripple suppressing method |
| CN109496016B (en) * | 2018-12-25 | 2021-06-01 | 福州大学 | Low-frequency ripple suppression method for high-power-factor LED driving power supply |
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