CN205141991U - PFC (power factor correction) circuit - Google Patents
PFC (power factor correction) circuit Download PDFInfo
- Publication number
- CN205141991U CN205141991U CN201520838485.1U CN201520838485U CN205141991U CN 205141991 U CN205141991 U CN 205141991U CN 201520838485 U CN201520838485 U CN 201520838485U CN 205141991 U CN205141991 U CN 205141991U
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- China
- Prior art keywords
- pfc
- resistance
- diode
- electric capacity
- rectifier bridge
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- 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
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Abstract
The utility model discloses a PFC (power factor correction) circuit, including the PFC controller, resistance R0, resistance R1, electric capacity C1, inductance L, diode D1 and rectifier bridge Q, the alternating current 220V both ends are connected respectively to two AC inputs of rectifier bridge Q, rectifier bridge Q's positive output end V+ connects electric capacity C1 respectively, the input voltage sampling end of inductance L and PFC controller, it is anodal that diode D2 is connected respectively to the inductance L other end, anodal and the PFC power tube VT pin 1 of diode D1, 2 difference connecting resistance R0 of PFC power tube VT pin, electric capacity C2 and resistance R2 and ground connection, the electric capacity C1 other end is connected respectively to the resistance R0 other end, the current sample end of rectifier bridge Q output V - and PFC controller. The utility model discloses PFC (power factor correction) circuit, circuit structure is simple, and is with low costs, still has the automatic function of stepping up, has saved step up transformer, and small, power factor correction is effectual.
Description
Technical field
The utility model relates to a kind of analog circuit, specifically a kind of pfc circuit.
Background technology
PFC and power factor correction, along with China's expanding economy, modern industry is rapidly developed, various current flow devices of changing uses more and more, capacity is also increasing, add some non-linear electric equipment and be also linked into electrical network, the harmonic current injection produced is in electrical network, the voltage waveform of utility network is distorted, seriously pollute the environment of electrical network, the quality of power supply is caused to decline, also seriously threaten the safe operation of various electric equipment in electrical network, therefore must limit high order harmonic component to pollute, electrically tissue has successively formulated relevant criterion both at home and abroad.
The method of solution power electronic equipment harmonic pollution problems conventional at present has two kinds: 1. pair electrical network adopts filtering compensation; 2. pair power electronic equipment itself is transformed, and namely carries out power factor correction.Both compare, and power factor correction more effectively can eliminate the harmonic wave of rectifying device, has prospect widely, how to improve Active PFC effect and reduces equipment volume, have become the research direction that of power electronic technology is important.
Utility model content
The purpose of this utility model is to provide a kind of pfc circuit, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of pfc circuit, comprise pfc controller, resistance R0, resistance R1, electric capacity C1, inductance L, diode D1 and rectifier bridge Q, described rectifier bridge Q two AC inputs connect alternating current 220V two ends respectively, the cathode output end V+ of rectifier bridge Q connects electric capacity C1 respectively, the input voltage sampling end of inductance L and pfc controller, the inductance L other end connects diode D2 positive pole respectively, diode D1 positive pole and PFC power tube VT pin 1, PFC power tube VT pin 2 is contact resistance R0 respectively, electric capacity C2 and resistance R2 ground connection, the resistance R0 other end connects the electric capacity C1 other end respectively, the current sample end of rectifier bridge Q output V-and pfc controller, described diode D2 negative pole connects ground connection diode D3 negative pole, described diode D1 negative pole connects the electric capacity C2 other end respectively, resistance R1 and output end vo, the output voltage sampling end of the resistance R1 other end difference contact resistance R2 other end and pfc controller, the switch control terminal of pfc controller connects PFC power tube VT pin 3.
As further program of the utility model: described diode D3 is voltage stabilizing didoe.
As the utility model further scheme: described pfc controller adopts UC3854.
Compared with prior art, the beneficial effects of the utility model are: the utility model pfc circuit, and circuit structure is simple, and cost is low, and also with automatic boosting function, eliminate step-up transformer, volume is little, and power factor correction is effective.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of pfc circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of pfc circuit, comprises pfc controller, resistance R0, resistance R1, electric capacity C1, inductance L, diode D1 and rectifier bridge Q, rectifier bridge Q two AC inputs connect alternating current 220V two ends respectively, and the cathode output end V+ of rectifier bridge Q connects electric capacity C1 respectively, the input voltage sampling end of inductance L and pfc controller, the inductance L other end connects diode D2 positive pole respectively, diode D1 positive pole and PFC power tube VT pin 1, PFC power tube VT pin 2 contact resistance R0 respectively, electric capacity C2 and resistance R2 ground connection, the resistance R0 other end connects the electric capacity C1 other end respectively, the current sample end of rectifier bridge Q output V-and pfc controller, diode D2 negative pole connects ground connection diode D3 negative pole, and diode D1 negative pole connects the electric capacity C2 other end respectively, resistance R1 and output end vo, the output voltage sampling end of the resistance R1 other end difference contact resistance R2 other end and pfc controller, the switch control terminal of pfc controller connects PFC power tube VT pin 3.
Diode D3 is voltage stabilizing didoe.
Pfc controller adopts UC3854.
Operation principle of the present utility model is: refer to Fig. 1, L is PFC inductance, D1 is PFC diode, C1 is civil power filter capacitor, VT is PFC power tube, R0 is mains current sampling resistor, the mains current sampled voltage of PFC control circuit input is negative value, R1, R2 are direct voltage sampling resistor, PFC control circuit is by the analysis to mains input voltage, VD and circuital current sampled value, export control signal, the duty ratio of control PFC power tube, thus reach the object of correcting circuit PFC.
When VT saturation conduction, be equivalent to L right-hand member ground connection, larger current iPFC at this moment will be had to flow through L, but due to the inductance characteristic of L, iPFC can only increase gradually, subsequently VT stopping, and the energy in inductance L maintains iPFC electric current and continues flowing, through D1, C1 is charged, and supply load, iPFC is reduced gradually, by the control of PFC control circuit, the continuous open and close repeatedly of PFC switching tube, generates output voltage at load two ends.
If PFC switching tube VT ON time is longer, in L, electric current is comparatively large, and the energy put aside in L is more, then the electric current maintained in L when VT ends is just larger.Otherwise if VT ON time is shorter, then the energy put aside in L is just less, and the electric current that L maintains when VT ends is also less.The length of visible control VT service time, get final product the size of electric current in control circuit, as long as so according to the opening and cut-off of rule control PFC switching tube of input voltage, just can make input current and input voltage well with homophase frequently, improve the input power factor of circuit.
When VT opens, the polarity of voltage at L two ends is left positive right negative.Now D1 anode is low, is in cut-off state, and the voltage at C2 two ends can not through VT bleed off.And when VT ends, the polarity inversion of L both end voltage, for the right side is just being born in a left side, now the induced potential at L two ends and the output voltage of rectifier bridge Q are in series, charged to C1 by D1, the voltage that the voltage at result C1 two ends exports higher than rectifier, therefore this pfc circuit also has boost function.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (3)
1. a pfc circuit, comprise pfc controller, resistance R0, resistance R1, electric capacity C1, inductance L, diode D1 and rectifier bridge Q, it is characterized in that, described rectifier bridge Q two AC inputs connect alternating current 220V two ends respectively, the cathode output end V+ of rectifier bridge Q connects electric capacity C1 respectively, the input voltage sampling end of inductance L and pfc controller, the inductance L other end connects diode D2 positive pole respectively, diode D1 positive pole and PFC power tube VT pin 1, PFC power tube VT pin 2 is contact resistance R0 respectively, electric capacity C2 and resistance R2 ground connection, the resistance R0 other end connects the electric capacity C1 other end respectively, the current sample end of rectifier bridge Q output V-and pfc controller, described diode D2 negative pole connects ground connection diode D3 negative pole, described diode D1 negative pole connects the electric capacity C2 other end respectively, resistance R1 and output end vo, the output voltage sampling end of the resistance R1 other end difference contact resistance R2 other end and pfc controller, the switch control terminal of pfc controller connects PFC power tube VT pin 3.
2. pfc circuit according to claim 1, is characterized in that, described diode D3 is voltage stabilizing didoe.
3. pfc circuit according to claim 1, is characterized in that, described pfc controller adopts UC3854.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520838485.1U CN205141991U (en) | 2015-10-27 | 2015-10-27 | PFC (power factor correction) circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520838485.1U CN205141991U (en) | 2015-10-27 | 2015-10-27 | PFC (power factor correction) circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205141991U true CN205141991U (en) | 2016-04-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520838485.1U Expired - Fee Related CN205141991U (en) | 2015-10-27 | 2015-10-27 | PFC (power factor correction) circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205141991U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106411157A (en) * | 2016-11-20 | 2017-02-15 | 广西大学 | Power supply suitable for electronic information system |
| CN106793254A (en) * | 2016-11-28 | 2017-05-31 | 沧州师范学院 | A kind of intelligent LED drive dynamic control device |
-
2015
- 2015-10-27 CN CN201520838485.1U patent/CN205141991U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106411157A (en) * | 2016-11-20 | 2017-02-15 | 广西大学 | Power supply suitable for electronic information system |
| CN106793254A (en) * | 2016-11-28 | 2017-05-31 | 沧州师范学院 | A kind of intelligent LED drive dynamic control device |
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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: 20160406 Termination date: 20161027 |