CN2384367Y - Common interference-resisting power factor corrector - Google Patents
Common interference-resisting power factor corrector Download PDFInfo
- Publication number
- CN2384367Y CN2384367Y CN 99215329 CN99215329U CN2384367Y CN 2384367 Y CN2384367 Y CN 2384367Y CN 99215329 CN99215329 CN 99215329 CN 99215329 U CN99215329 U CN 99215329U CN 2384367 Y CN2384367 Y CN 2384367Y
- Authority
- CN
- China
- Prior art keywords
- secondary winding
- power factor
- factor corrector
- common mode
- inductance coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a power factor corrector. A secondary winding is arranged on an inductive coil of a main circuit of the existing power factor corrector. One end of the secondary winding is connected with the output end of a rectifying bridge, the other end is an open circuit or is connected with a heat radiator, electric potential of the secondary winding is the same as electric potential of the inductive coil, and phrases are opposite. Ground displacement current of the secondary winding is used for counteracting common mode interference displacement current at any time, the purpose of eliminating of the common mode interference is reached, the structure is simple, stable operation is not affected, and an +interference range width is inhibited.
Description
The utility model relates to power factor corrector.
At present generally, comprise the inductance coil L1 that is connected on rectification bridge output end, the main circuit that switch transistor T 1, sustained diode, filter capacitor C constitute and be installed in radiator S in the power factor corrector, (see figure 1) at the power factor corrector that uses.Because the action of the HF switch of switch transistor T 1, cause the rate of change dv/dt of the node A above earth potential that switch transistor T 1 and inductance L 1 link to each other with sustained diode very big, thus the stray capacitance C between switch transistor T 1 and radiator
AAnd the stray capacitance C between radiator and ground
SDisplacement current i is arranged
Cm(among the figure shown in the dotted line), the common mode disturbances serious harm that this displacement current forms around the operate as normal of electronic equipment, the utmost point is waited to eliminate.Traditional removing method is to use the common mode disturbances filter that is made of common mode choke and ground capacity at the input of power supply, but this common mode disturbances filter is difficult to the High-frequency Interference more than the 5MHz is decayed, suppress limited in one's ability, even also can have influence on the stable operation of power factor corrector.
It is wide, simple in structure that the purpose of this utility model provides a kind of inhibition interference range, do not influence the power factor corrector of the anti-common mode disturbances of power factor corrector stable operation.
Technical solution of the present utility model is, the power factor corrector of anti-common mode disturbances comprises main circuit and the radiator that rectifier bridge, inductance coil, switching tube, fly-wheel diode, filter capacitor constitute, it is characterized in that secondary winding in inductance coil setting and this inductance coil electromagnetic coupled, one end of secondary winding links to each other with rectification bridge output end, the other end is opened a way or is linked to each other with radiator, and the secondary winding is opposite with the current potential phase place of inductance coil.
Like this, the displacement current that secondary winding above earth potential forms can be offset the common mode disturbances displacement current at any time, reaches the purpose that suppresses common mode disturbances.Preferably make the number of turn of secondary winding and the equal turn numbers of inductance coil, the above earth potential size of above earth potential that the secondary winding produces and inductance coil is identical, phase place is opposite, can obtain better common mode disturbances elimination effect so that make.
Below in conjunction with accompanying drawing the utility model is further described:
Fig. 1 is the main circuit of existing power factor corrector;
Fig. 2 is the power factor corrector example of anti-common mode disturbances of the present utility model.
With reference to Fig. 2, the power factor corrector of anti-common mode disturbances comprises rectifier bridge T, inductance coil L1, switch transistor T 1, sustained diode, main circuit and radiator S that filter capacitor C constitutes, on inductance coil L1, be wound with secondary winding L 2 with this inductance coil L1 electromagnetic coupled, one end of secondary winding L 2 links to each other with the output of rectifier bridge, the tie point A of this end and inductance coil L1 and switch transistor T 1 drain electrode is an end of the same name, the secondary winding is opposite with the current potential phase place of inductance coil, and the other end B of auxiliary winding end is open circuit in this example.The C that dotted line provides among the figure
A, C
BAnd C
SDistributed capacitance between difference representation switch pipe T1 and radiator, the distributed capacitance between secondary winding B end and radiator, the distributed capacitance between radiator and the ground.During work, the variation of secondary winding B point current potential is consistent with the amplitude of A point potential change size, and phase place is opposite, therefore the displacement current i that is produced by the A point
AWill be by the displacement current i of B point generation
BOffset, and between B point and radiator, have only very little parasitic capacitance C
BSo, operating frequency secondary winding is equivalent to open circuit, can not produce any influence to the stable operation of circuit.
The power factor corrector of anti-common mode disturbances of the present utility model is simple in structure, does not influence stable operation, and test shows that its wideband segment limit at 150kHz～20MHz all has tangible anti-common mode disturbances effect.
Claims (2)
1. the power factor corrector of an anti-common mode disturbances, comprise rectifier bridge T, inductance coil L1, main circuit and radiator S that switch transistor T 1, sustained diode, filter capacitor C constitute, it is characterized in that on inductance coil L1 being provided with secondary winding L 2 with this inductance coil electromagnetic coupled, one end of this secondary winding links to each other with the output of rectifier bridge, the other end is opened a way or is linked to each other with radiator, and the secondary winding is opposite with the current potential phase place of inductance coil.
2. by the power factor corrector of right 1 said anti-common mode disturbances, it is characterized in that the number of turn of secondary winding and the equal turn numbers of inductance coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99215329 CN2384367Y (en) | 1999-07-02 | 1999-07-02 | Common interference-resisting power factor corrector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99215329 CN2384367Y (en) | 1999-07-02 | 1999-07-02 | Common interference-resisting power factor corrector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2384367Y true CN2384367Y (en) | 2000-06-21 |
Family
ID=34007296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99215329 Expired - Fee Related CN2384367Y (en) | 1999-07-02 | 1999-07-02 | Common interference-resisting power factor corrector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2384367Y (en) |
-
1999
- 1999-07-02 CN CN 99215329 patent/CN2384367Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |