CN203482447U - Primary side feedback single-stage PFC output zero-ripple circuit - Google Patents
Primary side feedback single-stage PFC output zero-ripple circuit Download PDFInfo
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- CN203482447U CN203482447U CN201320345760.7U CN201320345760U CN203482447U CN 203482447 U CN203482447 U CN 203482447U CN 201320345760 U CN201320345760 U CN 201320345760U CN 203482447 U CN203482447 U CN 203482447U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a primary side feedback single-stage PFC output zero-ripple circuit. The primary side feedback single-stage PFC output zero-ripple circuit includes a primary side feedback switch power supply, a driving filter circuit connected with an output terminal of the primary side feedback switch power supply, a linear switch tube connected with an output terminal of the driving filter circuit and a short circuit protection circuit connected with an output terminal of the linear switch tube. The primary side feedback single-stage PFC output zero-ripple circuit can satisfy requirements of power factors and harmonic waves with a low cost, almost no output ripple exists, and stroboscopic phenomenon during shooting by a high power camera can be prevented.
Description
Technical field
The invention belongs to technical field of integrated circuits, relate to a kind of former limit feedback single-stage PFC output zero ripple circuit.
Background technology
At present, the use of light-emitting diode (LED) is more and more universal, and user has proposed more and more higher requirement to it.Wherein electrical isolation and constant current control technology, because relating to safety and LED useful life, therefore more and more come into one's own.Traditional method that realizes electrical isolation and constant current control is to be realized by conventional magnetic energy induction feedback or optocoupler feedback system.Conventional magnetic energy induction feedback system is comprised of auxiliary winding and sampling filter circuit conventionally.Voltage on auxiliary winding can raise with the rising of output voltage, by this voltage of sampling, then after filter circuit, becomes direct voltage, is connected to input and the voltage reference comparison of error amplifier after dividing potential drop.This kind of circuit structure is simple, but is unavoidably subject to the impact of the factors such as spurious impedance of leakage inductance, winding spurious impedance and secondary current rectifying and wave filtering circuit, causes voltage on auxiliary group of winding to change with secondary current, and then causes that output voltage changes; Auxiliary group of winding increases volume of transformer simultaneously, and cost raises.Optocoupler feedback system is got output end voltage, through dividing potential drop again with voltage reference comparison, voltage reference cathode potential is changed, thereby changes the electric current of the optocoupler of flowing through, the final error voltage that changes error amplifier of realizing.This kind of circuit voltage regulation result is good, but the current transfer ratio of optocoupler (CTR) can decay with high temperature in time, make circuit unstable, and peripheral component is more, use inconvenience, and cost is higher.So there is former limit feedback circuit, former limit feedback circuit is generally used for the LED driving power below indoor 40W, sort circuit mainly can be accomplished low cost, can meet the requirement of power factor requirement and harmonic wave simultaneously, but the ripple of output is very large, as shown in Figure 1, causes LED lamp at 50Hz/60Hz stroboscopic, people can meet the demands soon time substantially, if but have serious stroboscopic while taking with camera.
Therefore the defect existing for above-mentioned existing former limit feedback circuit, is necessary to develop research in fact, can accomplish low cost to provide a kind of, can meet again the requirement of power factor requirement and harmonic wave simultaneously, output ripple is zero circuit substantially.
Summary of the invention
For addressing the above problem, the object of the present invention is to provide a kind of former limit feedback single-stage PFC output zero ripple circuit, it can accomplish low cost, can meet again the requirement of power factor requirement and harmonic wave simultaneously, output ripple is zero substantially, occurs stroboscopic phenomenon while taking with high power camera to avoid adopting.
For achieving the above object, technical scheme of the present invention is:
A kind of former limit feedback single-stage PFC output zero ripple circuit; comprise former limit feedback switch power supply, connect the output of former limit feedback switch power supply driving filter circuit, connect the linear switch pipe and the short-circuit protection circuit that drive filter circuit output; wherein, described short-circuit protection circuit is connected to the output of linear switch pipe.
Further, described short-circuit protection circuit includes triode (Q3), is connected in series in the collector electrode of triode (Q3) and the first diode (D11) between emitter, the second diode (D12) and the 7th resistance (R27), is connected in series in the 6th resistance (R26) and the 4th electric capacity (C14) between the base stage of triode (Q3).
Further, the emitter of described triode (Q3) is also connected to V+, and the series arm that the collector electrode of triode is also connected in parallel to the 5th resistance (R25) and consists of the 4th resistance (R24) and the 4th diode (D14).
Further; described the first diode (D11), the second diode (D12) and the 7th resistance (R27) form a step-down and short-circuit protection circuit; when having output short-circuit; the first diode (D11), the second diode (D12) and the 7th resistance (R27) shorted to earth, drag down the voltage of whole output.
Further, described the 4th diode (D14), the 4th resistance (R24), the 5th resistance (R25) and the 4th electric capacity (C14) form one and consider wave circuit, and described the 6th resistance (R26) is for driving resistance.
Compared to prior art, a kind of former limit feedback single-stage PFC output of the present invention zero ripple circuit can be accomplished low cost, can meet again the requirement of power factor requirement and harmonic wave, output ripple is zero substantially simultaneously, occurs stroboscopic phenomenon while taking with high power camera to avoid adopting.
Accompanying drawing explanation
Fig. 1 is traditional former limit feedback circuit output ripple diagram;
Fig. 2 is principle module frame chart of the present invention;
Fig. 3 is circuit theory diagrams of the present invention;
Fig. 4 is short-circuit protection circuit schematic diagram of the present invention;
Fig. 5 is circuit output ripple diagram of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 2, Figure 3, Figure 4, a kind of former limit of the present invention feedback single-stage PFC output zero ripple circuit includes former limit feedback switch power supply, connects the driving filter circuit of former limit feedback switch power supply output, connect the short-circuit protection circuit that drives the linear switch pipe of filter circuit output and connect linear switching tube output.
Shown in Fig. 3, the operation principle of prime is identical with traditional former limit feedback operation principle, therefore repeat no more.As shown in Figure 3, Figure 4, the short-circuit protection circuit of rear class include triode Q3, be connected in series in triode Q3 collector electrode and the first diode D11 between emitter, the second diode D12 and the 7th resistance R 27, be connected in series in the 6th resistance R 26 and the 4th capacitor C 14 between the base stage of triode Q3.Wherein, the emitter of triode Q3 is also connected to V+, and the series arm that the collector electrode of triode is also connected in parallel to the 5th resistance R 25 and consists of the 4th resistance R 24 and the 4th diode D14.
Described triode Q1 is that a crystal is considered wave circuit; Described the first diode D11, the second diode D12 and the 7th resistance R 27 form a step-down and short-circuit protection circuit; when having output short-circuit; the first diode D11, the second diode D12 and the 7th resistance R 27 shorted to earths; the voltage of whole output is dragged down; after output is dragged down, the VCC of elementary U1 is dragged down simultaneously.After VCC is dragged down, U1 quits work.Described the 4th diode D14, the 4th resistance R 24, the 5th resistance R 25 and the 4th capacitor C 14 form one and consider wave circuit, and the 6th resistance R 26 is for driving resistance.When a direct voltage with high ripple is inputted from the collector electrode of triode Q3, direct current is given the 4th capacitor C 14 chargings by the 4th resistance R 24, the 4th diode D14, like this to provide one group of level and smooth direct current to drive triode Q3 by the 6th resistance R 26, as shown in Figure 5, make a level and smooth direct current of triode Q3 output, thereby output ripple is zero substantially, while taking with high power camera to avoid adopting, there is stroboscopic phenomenon.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. a former limit feedback single-stage PFC exports zero ripple circuit; comprise former limit feedback switch power supply, connect the output of former limit feedback switch power supply driving filter circuit, connect the linear switch pipe that drives filter circuit output; it is characterized in that: also include short-circuit protection circuit; wherein, described short-circuit protection circuit is connected to the linear transistorized output of ripple of considering.
2. former limit feedback single-stage PFC output as claimed in claim 1 zero ripple circuit, is characterized in that: described short-circuit protection circuit includes triode (Q3), be connected in series in the collector electrode of triode (Q3) and the first diode (D11) between emitter, the second diode (D12) and the 7th resistance (R27), be connected in series in the 6th resistance (R26) and the 4th electric capacity (C14) between the base stage of triode (Q3).
3. former limit feedback single-stage PFC as claimed in claim 2 exports zero ripple circuit, it is characterized in that: the emitter of described triode (Q3) is also connected to V+, and the series arm that the collector electrode of triode is also connected in parallel to the 5th resistance (R25) and consists of the 4th resistance (R24) and the 4th diode (D14).
4. former limit feedback single-stage PFC as claimed in claim 3 exports zero ripple circuit; it is characterized in that: described the first diode (D11), the second diode (D12) and the 7th resistance (R27) form a step-down and short-circuit protection circuit; when having output short-circuit; the first diode (D11), the second diode (D12) and the 7th resistance (R27) shorted to earth; the voltage of output is dragged down; cause elementary VCC lower voltage, power supply enters guard mode.
5. former limit feedback single-stage PFC as claimed in claim 4 exports zero ripple circuit, it is characterized in that: described the 4th diode (D14), the 4th resistance (R24), the 5th resistance (R25) and the 4th electric capacity (C14) form one and considers wave circuit, and described the 6th resistance (R26) is for driving resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320345760.7U CN203482447U (en) | 2013-06-17 | 2013-06-17 | Primary side feedback single-stage PFC output zero-ripple circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320345760.7U CN203482447U (en) | 2013-06-17 | 2013-06-17 | Primary side feedback single-stage PFC output zero-ripple circuit |
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| Publication Number | Publication Date |
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| CN203482447U true CN203482447U (en) | 2014-03-12 |
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| CN201320345760.7U Expired - Fee Related CN203482447U (en) | 2013-06-17 | 2013-06-17 | Primary side feedback single-stage PFC output zero-ripple circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103945608A (en) * | 2014-04-15 | 2014-07-23 | 广东科谷电源有限公司 | Low power consumed LED linear power supply with following characteristic |
| CN104270009A (en) * | 2014-09-23 | 2015-01-07 | 广东美的制冷设备有限公司 | Multi-output power circuit and air conditioner |
| CN113242629A (en) * | 2021-05-12 | 2021-08-10 | 深圳市正远科技有限公司 | Follow anti short-circuit protection of adjusting luminance and remove ripple circuit |
-
2013
- 2013-06-17 CN CN201320345760.7U patent/CN203482447U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103945608A (en) * | 2014-04-15 | 2014-07-23 | 广东科谷电源有限公司 | Low power consumed LED linear power supply with following characteristic |
| CN103945608B (en) * | 2014-04-15 | 2016-08-17 | 广东科谷电源股份有限公司 | A kind of low-power consumption LED linear power supply with following feature |
| CN104270009A (en) * | 2014-09-23 | 2015-01-07 | 广东美的制冷设备有限公司 | Multi-output power circuit and air conditioner |
| CN113242629A (en) * | 2021-05-12 | 2021-08-10 | 深圳市正远科技有限公司 | Follow anti short-circuit protection of adjusting luminance and remove ripple circuit |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140312 Termination date: 20190617 |
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| CF01 | Termination of patent right due to non-payment of annual fee |