CN203086369U - PFC boost circuit - Google Patents
PFC boost circuit Download PDFInfo
- Publication number
- CN203086369U CN203086369U CN 201220544171 CN201220544171U CN203086369U CN 203086369 U CN203086369 U CN 203086369U CN 201220544171 CN201220544171 CN 201220544171 CN 201220544171 U CN201220544171 U CN 201220544171U CN 203086369 U CN203086369 U CN 203086369U
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- voltage control
- control circuit
- rectifier bridge
- common mode
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Abstract
The utility model discloses a PFC boost circuit. The PFC boost circuit comprises a rectifier bridge DB1 and a voltage control circuit, and the anode end and the cathode end of the rectifier bridge DB1 are connected with the anode input end and the cathode input end of the voltage control circuit respectively. The PFC boost circuit also comprises a common mode choke L1 which comprises a first winding and a second winding, the first winding is connected between the anode end of the rectifier bridge DB1 and the anode input end of the voltage control circuit, and the second winding is connected between the cathode end of the rectifier bridge DB1 and the cathode input end of the voltage control circuit. Because the common mode choke is connected between the rectifier bridge DB1 and the voltage control circuit, an electromagnetic interference can be reduced, and the imaging effect of a LCD or a liquid crystal display television is good.
Description
Technical field
The utility model relates to the drive circuit board technical field, relates in particular to the PFC booster circuit.
Background technology
The backlight of LCD and part liquid crystal display television is light-emitting diode (LED), and it is connected with the PFC booster circuit, and this circuit provides power supply for backlight.Existing P FC booster circuit comprises rectifier bridge DB1 and voltage control circuit, and rectifier bridge DB1 directly connects voltage control circuit, for voltage control circuit provides DC power supply after the rectification; There is certain electromagnetic interference (EMI) in this circuit, can influence the imaging effect of LCD or liquid crystal display television.
Summary of the invention
The utility model provides the PFC booster circuit that reduces electromagnetic interference.
The PFC booster circuit, comprise rectifier bridge DB1 and voltage control circuit, the positive terminal of rectifier bridge DB1 connects the electrode input end of voltage control circuit, the negative pole end of rectifier bridge DB1 connects the negative input of voltage control circuit, also comprise common mode inductance, common mode inductance comprises first winding and second winding, first winding is connected between the electrode input end of the positive terminal of rectifier bridge DB1 and voltage control circuit, and second winding is connected between the negative input of the negative pole end of rectifier bridge DB1 and voltage control circuit.
Wherein, voltage control circuit comprises driving governor U1, field effect transistor Q1, inductance L 1, diode D1, capacitor C 1, C2, resistance R 1; One end of the electrode input end of voltage control circuit and inductance L 1, one end of capacitor C 2 connects, the drain electrode of the other end of inductance L 1 and field effect transistor Q1, the positive pole of diode D1 connects, one end of the negative pole of diode D1 and capacitor C 1, the cathode output end of voltage control circuit connects, the grid of field effect transistor Q1 is connected with the drive output of driving governor U1, the feedback input end of driving governor U1 and the cathode output end of voltage control circuit, one end of resistance R 1 connects, the negative input of voltage control circuit, the other end of capacitor C 2, the source electrode of field effect transistor Q1, the other end of capacitor C 1, the other end ground connection of resistance R 1.
Wherein, common mode inductance is the common mode inductance of model C M3225-601-2P-T.
Wherein, common mode inductance is the common mode inductance of model C M4532-601-2P-T.
Wherein, driving governor U1 is a model L6561 chip.
Wherein, driving governor U1 is a model L6562 chip.
Wherein, field effect transistor Q1 is a model SVD13N50 metal-oxide-semiconductor.
Wherein, diode D1 is a model M8FU060 diode.
Beneficial effect: the utility model comprises rectifier bridge DB1 and voltage control circuit, the positive terminal of rectifier bridge DB1 connects the electrode input end of voltage control circuit, the negative pole end of rectifier bridge DB1 connects the negative input of voltage control circuit, also comprise common mode inductance, common mode inductance comprises first winding and second winding, first winding is connected between the electrode input end of the positive terminal of rectifier bridge DB1 and voltage control circuit, and second winding is connected between the negative input of the negative pole end of rectifier bridge DB1 and voltage control circuit; Owing between rectifier bridge DB1 and voltage control circuit, connected common mode inductance, can reduce electromagnetic interference, the imaging effect of LCD or liquid crystal display television is good.
Description of drawings
Fig. 1 is a schematic diagram of the present utility model.
Embodiment
Referring to Fig. 1, the utility model is described in detail below in conjunction with accompanying drawing.
The PFC booster circuit of present embodiment, comprise rectifier bridge DB1 and voltage control circuit, the positive terminal of rectifier bridge DB1 connects the electrode input end of voltage control circuit, the negative pole end of rectifier bridge DB1 connects the negative input of voltage control circuit, also comprise common mode inductance, common mode inductance comprises first winding and second winding, first winding is connected between the electrode input end of the positive terminal of rectifier bridge DB1 and voltage control circuit, and second winding is connected between the negative input of the negative pole end of rectifier bridge DB1 and voltage control circuit.Common mode inductance (Common mode Choke) also be common mode choke, can filter electromagnetic interference signal.
In the present embodiment, voltage control circuit comprises driving governor U1, field effect transistor Q1, inductance L 1, diode D1, capacitor C 1, C2, resistance R 1; One end of the electrode input end of voltage control circuit and inductance L 1, one end of capacitor C 2 connects, the drain electrode of the other end of inductance L 1 and field effect transistor Q1, the positive pole of diode D1 connects, one end of the negative pole of diode D1 and capacitor C 1, the cathode output end of voltage control circuit connects, the grid of field effect transistor Q1 is connected with the drive output of driving governor U1, the feedback input end of driving governor U1 and the cathode output end of voltage control circuit, one end of resistance R 1 connects, the negative input of voltage control circuit, the other end of capacitor C 2, the source electrode of field effect transistor Q1, the other end of capacitor C 1, the other end ground connection of resistance R 1.
In the present embodiment, common mode inductance is the common mode inductance of model C M3225-601-2P-T, or common mode inductance is the common mode inductance of model C M4532-601-2P-T.Driving governor U1 is a model L6561 chip, or driving governor U1 is a model L6562 chip; Fig. 1 principle of only drawing, the typical peripheral circuit of driving governor U1 do not draw, and when implementing the technical program, the technical staff can be voluntarily with reference to typical peripheral circuit.Field effect transistor Q1 is a model SVD13N50 metal-oxide-semiconductor.Diode D1 is a model M8FU060 diode.
Except that above-mentioned concrete voltage control circuit, according to main thought of the present utility model, the utility model can also use other voltage control circuit.Those skilled in the art utilize prior art and limited experiment, can select the components and parts on suitable voltage control circuit and the change circuit according to concrete application requirements.
Owing between rectifier bridge DB1 and voltage control circuit, connected common mode inductance, can reduce electromagnetic interference, after the application the technical program, the imaging effect of LCD or liquid crystal display television is good.The technical program also can be applicable to the driving power of other electronic product, is specially adapted to electromagnetic interference is had the electronic product of strict demand.
Above content only is preferred embodiment of the present utility model, for those of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, this description should not be construed as restriction of the present utility model.
Claims (8)
1.PFC booster circuit, comprise rectifier bridge DB1 and voltage control circuit, the positive terminal of rectifier bridge DB1 connects the electrode input end of voltage control circuit, the negative pole end of rectifier bridge DB1 connects the negative input of voltage control circuit, it is characterized in that, also comprise common mode inductance, common mode inductance comprises first winding and second winding, first winding is connected between the electrode input end of the positive terminal of rectifier bridge DB1 and voltage control circuit, and second winding is connected between the negative input of the negative pole end of rectifier bridge DB1 and voltage control circuit.
2. PFC booster circuit according to claim 1 is characterized in that described voltage control circuit comprises driving governor U1, field effect transistor Q1, inductance L 1, diode D1, capacitor C 1, C2, resistance R 1; One end of the electrode input end of voltage control circuit and inductance L 1, one end of capacitor C 2 connects, the drain electrode of the other end of inductance L 1 and field effect transistor Q1, the positive pole of diode D1 connects, one end of the negative pole of diode D1 and capacitor C 1, the cathode output end of voltage control circuit connects, the grid of field effect transistor Q1 is connected with the drive output of driving governor U1, the feedback input end of driving governor U1 and the cathode output end of voltage control circuit, one end of resistance R 1 connects, the negative input of voltage control circuit, the other end of capacitor C 2, the source electrode of field effect transistor Q1, the other end of capacitor C 1, the other end ground connection of resistance R 1.
3. PFC booster circuit according to claim 2 is characterized in that, described common mode inductance is the common mode inductance of model C M3225-601-2P-T.
4. PFC booster circuit according to claim 2 is characterized in that, described common mode inductance is the common mode inductance of model C M4532-601-2P-T.
5. PFC booster circuit according to claim 2 is characterized in that, described driving governor U1 is a model L6561 chip.
6. PFC booster circuit according to claim 2 is characterized in that, described driving governor U1 is a model L6562 chip.
7. PFC booster circuit according to claim 2 is characterized in that, described field effect transistor Q1 is a model SVD13N50 metal-oxide-semiconductor.
8. PFC booster circuit according to claim 2 is characterized in that, described diode D1 is a model M8FU060 diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220544171 CN203086369U (en) | 2012-10-23 | 2012-10-23 | PFC boost circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220544171 CN203086369U (en) | 2012-10-23 | 2012-10-23 | PFC boost circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203086369U true CN203086369U (en) | 2013-07-24 |
Family
ID=48832171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220544171 Expired - Fee Related CN203086369U (en) | 2012-10-23 | 2012-10-23 | PFC boost circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203086369U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104079162A (en) * | 2014-06-10 | 2014-10-01 | 南京航空航天大学 | Power converter and common-mode EMI noise source restraining method for power converter |
| CN109787474A (en) * | 2019-02-25 | 2019-05-21 | 珠海祺力电子科技有限公司 | A kind of electromagnetism superimposing amplifier |
-
2012
- 2012-10-23 CN CN 201220544171 patent/CN203086369U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104079162A (en) * | 2014-06-10 | 2014-10-01 | 南京航空航天大学 | Power converter and common-mode EMI noise source restraining method for power converter |
| CN109787474A (en) * | 2019-02-25 | 2019-05-21 | 珠海祺力电子科技有限公司 | A kind of electromagnetism superimposing amplifier |
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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 |
Granted publication date: 20130724 Termination date: 20151023 |
|
| EXPY | Termination of patent right or utility model |