CN201656761U - Soft start circuit for PFC switch power supply - Google Patents
Soft start circuit for PFC switch power supply Download PDFInfo
- Publication number
- CN201656761U CN201656761U CN2010200563009U CN201020056300U CN201656761U CN 201656761 U CN201656761 U CN 201656761U CN 2010200563009 U CN2010200563009 U CN 2010200563009U CN 201020056300 U CN201020056300 U CN 201020056300U CN 201656761 U CN201656761 U CN 201656761U
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- power supply
- vcc
- soft start
- comp
- switching power
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- 239000003990 capacitor Substances 0.000 claims abstract description 6
- 230000005856 abnormality Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The utility model discloses a soft start circuit for a PFC switch power supply, which comprises a power supply input end (Vcc), a control end (COMP) and sequentially series-connected diodes (D1). The control end (COMP) is connected with a phase compensation pin of a control chip of the PFC switch power supply, positive electrodes of the sequentially series-connected diodes (D1) are connected with the control end (COMP), negative electrodes of the sequentially series-connected diodes (D1) are connected with the power supply input end (Vcc), a resistor is connected between a common port of the sequentially series-connected diodes (D1) and the power supply input end (Vcc), and a capacitor is connected between the common port of the sequentially series-connected diodes (D1) and ground. Compared with the prior art, the soft start circuit can more effectively and conveniently adjust soft start delay, reduces EMC and wave form abnormality and improves transformer sound.
Description
Technical field
The utility model relates to Switching Power Supply, relates in particular to a kind of soft starting circuit of the PFC of being used for Switching Power Supply.
Background technology
There are many electronic products to select for use to have power factor correction the Switching Power Supply power supply of (PFC) function at present, save the energy to improve circuit power factor.Control IC (FAN7530) the control transformer work of existing P FC Switching Power Supply.Referring to Fig. 1, the 3rd pin of control IC (FAN7530) is a voltage/current phase compensation pin (COMP), the external electric capacity of this pin, and COMP is to this electric capacity charging, and charging finishes soft start and finishes the Switching Power Supply operate as normal.In actual use,, cause the time-delay deficiency of soft start, be unfavorable for reducing EMC and waveform is unusual, can make transformer produce sound simultaneously because the above-mentioned charging interval is shorter.
The utility model content
The utility model is the problems referred to above that will solve prior art, proposes a kind of soft starting circuit that is used for the PFC Switching Power Supply.
For solving the problems of the technologies described above, the technical scheme that the utility model proposes is: a kind of soft starting circuit of the PFC of being used for Switching Power Supply, and it comprises: power input; Connect the control end of PFC Switching Power Supply control chip phase compensation pin; Along the string diode, this anode along the string diode connects control end, connects power input along the negative electrode of string diode, is connected to a resistance between along string common port of diode and power input, is connected to an electric capacity between along the common port of string diode and ground.
Above-mentioned resistance can be adjustable resistance.Above-mentioned electric capacity can be electrochemical capacitor.
Compared with prior art, the utility model has preferable can regulate the soft start time-delay easily, has reduced EMC and waveform is unusual, has improved the transformer sound.
Description of drawings
Below in conjunction with drawings and Examples the utility model is made detailed explanation, wherein:
Fig. 1 is the circuit diagram of existing control circuit;
Fig. 2 is the circuit diagram of the utility model preferred embodiment.
Embodiment
Referring to Fig. 1, the utility model comprises: power input Vcc meets the control end COMP of PFC Switching Power Supply control chip (FAN7530) phase compensation pin and along string diode D1.Anode (pin 1) along string diode D1 meets control end COMP, negative electrode (pin 2) along string diode D1 meets power input Vcc, be connected to a resistance along between the common port (pin 3) of string diode D1 and the power input Vcc, be connected to an electric capacity between the common port of diode D1 and the ground along going here and there.
In preferred embodiment, described resistance is adjustable resistance R1.Described electric capacity is electrochemical capacitor C1.
During work, Switching Power Supply powers on, and Vcc begins power supply, and the common port COMP of control chip is by the inner diode pair electrochemical capacitor C1 charging of D1 (model is BAV99), and charging finishes the back soft start and finishes the Switching Power Supply operate as normal.The effect of the external Vcc power supply of R1 is the charging interval of control capacittance, controls the time length of soft start; When shutdown, another diode repid discharge in D1 of the electric charge among the electrochemical capacitor C1.
Above embodiment is only for illustrating non-providing constraints.Anyly do not break away from spirit of the present invention and category, and, all should be contained among the claim scope of the application of enclosing its equivalent modifications of carrying out or change.
Claims (3)
1. a soft starting circuit that is used for the PFC Switching Power Supply is characterized in that comprising: power input (Vcc); Connect the control end (COMP) of PFC Switching Power Supply control chip phase compensation pin; Along string diode (D1), should connect control end (COMP) along the anode of string diode (D1), negative electrode along string diode (D1) connects power input (Vcc), between common port and power input (Vcc), be connected to a resistance, be connected to an electric capacity between the common port of diode (D1) and the ground along going here and there along string diode (D1).
2. the soft starting circuit that is used for the PFC Switching Power Supply as claimed in claim 1 is characterized in that: described resistance is adjustable resistance (R1).
3. the soft starting circuit that is used for the PFC Switching Power Supply as claimed in claim 1 is characterized in that: described electric capacity is electrochemical capacitor (C1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200563009U CN201656761U (en) | 2010-01-08 | 2010-01-08 | Soft start circuit for PFC switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200563009U CN201656761U (en) | 2010-01-08 | 2010-01-08 | Soft start circuit for PFC switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201656761U true CN201656761U (en) | 2010-11-24 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010200563009U Expired - Fee Related CN201656761U (en) | 2010-01-08 | 2010-01-08 | Soft start circuit for PFC switch power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201656761U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282901A (en) * | 2014-06-19 | 2016-01-27 | 欧普照明股份有限公司 | LED driving power supply starting circuit and method |
| CN114552988A (en) * | 2022-03-02 | 2022-05-27 | 电子科技大学 | Soft start method of Buck type power factor correction circuit |
| CN114710018A (en) * | 2022-06-06 | 2022-07-05 | 广东东菱电源科技有限公司 | PFC protection circuit for fast startup and shutdown |
-
2010
- 2010-01-08 CN CN2010200563009U patent/CN201656761U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282901A (en) * | 2014-06-19 | 2016-01-27 | 欧普照明股份有限公司 | LED driving power supply starting circuit and method |
| CN105282901B (en) * | 2014-06-19 | 2019-01-04 | 欧普照明股份有限公司 | A kind of LED drive power start-up circuit and starting method |
| CN114552988A (en) * | 2022-03-02 | 2022-05-27 | 电子科技大学 | Soft start method of Buck type power factor correction circuit |
| CN114710018A (en) * | 2022-06-06 | 2022-07-05 | 广东东菱电源科技有限公司 | PFC protection circuit for fast startup and shutdown |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20130108 |