CN201378739Y - Power factor correction circuit - Google Patents
Power factor correction circuit Download PDFInfo
- Publication number
- CN201378739Y CN201378739Y CN200920136917U CN200920136917U CN201378739Y CN 201378739 Y CN201378739 Y CN 201378739Y CN 200920136917 U CN200920136917 U CN 200920136917U CN 200920136917 U CN200920136917 U CN 200920136917U CN 201378739 Y CN201378739 Y CN 201378739Y
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- circuit
- power factor
- factor correction
- electricity connects
- emc
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model discloses a power factor correction circuit, which comprises an EMC filter circuit, a rectifying filter circuit, a starting circuit, a high-frequency oscillation circuit and a power factor correction circuit. The EMC filter circuit is provided with an EMC filter input end and an EMC filter output end, wherein the EMC filter output end can be electrically connected with an external power source. The rectifying filter circuit is electrically connected with the EMC filter circuit, the starting circuit is electrically connected with the rectifying filter circuit, and the high-frequency oscillation circuit is electrically connected with the starting circuit. The power factor correction circuit comprises a capacitor C6, and one end of the power factor correction circuit is electrically connected with a first electrode of a lamp tube while the other end is electrically connected with a first electrode of the EMC filter output end. The power factor of the circuit can reach over 0.97 because the circuit is provided with the power factor correction circuit, thereby overcoming shortages in the background technique and being capable of meeting requirements of national and international standards.
Description
Technical field
The utility model relates to a kind of passive power factor correcting circuit of electricity-saving lamp ballast.
Background technology
Now the passive power factor correcting circuit of the electric ballast on the market mainly contains following three classes: high pump formula, double pump formula and by the stream filter circuit.This high pump formula circuit has following deficiency: its output dc voltage compares higher, and the impact of high-frequency signal is arranged again, and the temperature of device can directly have influence on the life-span of ballast than higher.This double pump formula circuit has following deficiency: its power factor can only be accomplished about 0.93, and input current abnormality severity does not satisfy the requirement of GB and IEC at all for harmonic wave.Should be the same with double pump formula circuit by the deficiency that the stream filter circuit exists, all do not satisfy the requirement of GB and IEC.
The utility model content
The utility model provides a kind of circuit of power factor correction, and it has overcome the existing deficiency that can't satisfy domestic and international standard-required of passive power factor correcting circuit on the present market.
The technical scheme that its technical problem that solves the utility model adopts is:
A kind of circuit of power factor correction, it comprises:
One EMC filter circuit, it has an EMC filtering input and the EMC filtering output end that an energy electricity connect external power;
One current rectifying and wave filtering circuit, it has a rectifying and wave-filtering input and the rectifying and wave-filtering output that an electricity connects the EMC filtering output end;
One start-up circuit, it has a startup input and the startup output that an electricity connects the rectifying and wave-filtering output;
One high frequency oscillation circuit, its electricity connects the startup output, and electricity connects fluorescent tube; And
One circuit of power factor correction, it comprises a capacitor C 6, and its end electricity connects fluorescent tube first utmost point, and other end electricity connects EMC filtering output end first utmost point.
In the utility model one preferred embodiment, also comprise:
Shunt circuit, it comprises a capacitor C 4, and its end electricity connects fluorescent tube second utmost point, and other end electricity connects EMC filtering output end second utmost point.
In the utility model one preferred embodiment, also comprise:
One discharge circuit, it comprises a capacitor C 7, and its end electricity connects EMC filtering output end second utmost point, and other end electricity connects rectifying and wave-filtering output first utmost point.
In the utility model one preferred embodiment, this current rectifying and wave filtering circuit comprises a bridge rectifier and an electrochemical capacitor E, and the diode of this bridge rectifier is a fast diode.
The technical program is compared with background technology: 1, be provided with circuit of power factor correction, power factor can reach more than 0.97, can overcome the existing deficiency of background technology, can satisfy domestic and international standard-required; 2, by the cooperation of capacitor C 7 and current rectifying and wave filtering circuit C8, can make the total harmonic wave of electric current less than 20%, crest factor is less than 1.7; 3, this circuit theory is simple, and required device is few, and cost is low.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the circuit diagram of the utility model one preferred embodiment.
Embodiment
Please refer to Fig. 1, a kind of circuit of power factor correction, it comprises an EMC filter circuit, a current rectifying and wave filtering circuit, a start-up circuit, a high frequency oscillation circuit, a circuit of power factor correction, shunt circuit and a discharge circuit.
This EMC filter circuit is made up of L1, C1 and C8, has an EMC filtering input and an EMC filtering output end that an energy electricity connect external power.
This current rectifying and wave filtering circuit comprises a bridge rectifier (this diode D1-D4 adopts fast diode, with adaptive radio-frequency component) and an electrochemical capacitor E who is made up of D1, D2, D3 and D4.It has a rectifying and wave-filtering input and the rectifying and wave-filtering output that an electricity connects the EMC filtering output end.
This discharge circuit, it comprises a capacitor C 7, and its end electricity connects EMC filtering output end second utmost point, and other end electricity connects rectifying and wave-filtering output first utmost point.It is not only as the discharge loop of electrolysis, but also plays the high frequency feedback effect.Suitable control capacittance C7, C8 can effectively reduce the total humorous size that involves crest factor of electric current.
This start-up circuit is by R1, R2, and C3, DB3 forms.It has a startup input and the startup output that an electricity connects the rectifying and wave-filtering output;
This high frequency oscillation circuit, its electricity connects the startup output, and electricity connects fluorescent tube.
This circuit of power factor correction, it comprises a capacitor C 6.These capacitor C 6 one end electricity connect fluorescent tube first utmost point, and other end electricity connects EMC filtering output end first utmost point.
This shunt circuit, it comprises capacitor C 4.These capacitor C 4 one end electricity connect fluorescent tube second utmost point, and other end electricity connects EMC filtering output end second utmost point, and it is as the shunting capacitance of fluorescent tube, not only effectively protecting fluorescent tube, but also play the high frequency feedback effect, thereby power factor can be accomplished more than 0.97.
External power source is given electrolysis E charging behind EMC filter circuit and bridge rectifier, arrive start-up circuit again, so that the high-frequency oscillating circuits of back works together.Present embodiment realizes that the principle of power factor correction is: capacitor C 6 can allow output current flow through from power supply and rectifier bridge D1-D4, because of power supply can be considered short circuit for high-frequency signal, therefore in oscillatory process: during positive half period, electric current divides two-way to walk through capacitor C 6 to power supply, one the tunnel directly passes through from D3 when diode D3 conducting, another road is flow through from D1 and C7 respectively to inductance L 1 through power supply when diode D1 conducting again, CE knot from triode V1 flows there through inductance L 2 then, to fluorescent tube, arrive capacitor C 6 at last and form the loop; During negative half-cycle, electric current is by capacitor C 6 fluorescent tube of flowing through, and to inductance L 2, the CE to triode V2 ties ground again, then at diode D2, flows there through power supply from two diodes respectively during the D4 conducting, arrives capacitor C 6 at last.Because the stack of high-frequency current has been arranged, therefore can effectively prolong diode current flow time and corresponding raising decomposition voltage, thereby play the effect that improves power factor.
The above, it only is the utility model preferred embodiment, so can not limit the scope that the utility model is implemented with this, i.e. the equivalence of doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model patent contains.
Claims (4)
1. circuit of power factor correction, it comprises:
One EMC filter circuit, it has an EMC filtering input and the EMC filtering output end that an energy electricity connect external power;
One current rectifying and wave filtering circuit, it has a rectifying and wave-filtering input and the rectifying and wave-filtering output that an electricity connects the EMC filtering output end;
One start-up circuit, it has a startup input and the startup output that an electricity connects the rectifying and wave-filtering output;
One high frequency oscillation circuit, its electricity connects the startup output, and electricity connects fluorescent tube;
It is characterized in that: also comprise:
One circuit of power factor correction, it comprises a capacitor C 6, and its end electricity connects fluorescent tube first utmost point, and other end electricity connects EMC filtering output end first utmost point.
2. a kind of circuit of power factor correction according to claim 1 is characterized in that: also comprise:
Shunt circuit, it comprises a capacitor C 4, and its end electricity connects fluorescent tube second utmost point, and other end electricity connects EMC filtering output end second utmost point.
3. a kind of circuit of power factor correction according to claim 2 is characterized in that: also comprise:
One discharge circuit, it comprises a capacitor C 7, and its end electricity connects EMC filtering output end second utmost point, and other end electricity connects rectifying and wave-filtering output first utmost point.
4. according to claim 1 or 2 or 3 described a kind of circuit of power factor correction, it is characterized in that: this current rectifying and wave filtering circuit comprises a bridge rectifier and an electrochemical capacitor E, and the diode of this bridge rectifier is a fast diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920136917U CN201378739Y (en) | 2009-02-26 | 2009-02-26 | Power factor correction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920136917U CN201378739Y (en) | 2009-02-26 | 2009-02-26 | Power factor correction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201378739Y true CN201378739Y (en) | 2010-01-06 |
Family
ID=41518859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920136917U Expired - Fee Related CN201378739Y (en) | 2009-02-26 | 2009-02-26 | Power factor correction circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201378739Y (en) |
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2009
- 2009-02-26 CN CN200920136917U patent/CN201378739Y/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 | ||
| 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: 20100106 Termination date: 20160226 |