CN102195464A - Power factor correction circuit and control method thereof - Google Patents
Power factor correction circuit and control method thereof Download PDFInfo
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- CN102195464A CN102195464A CN2010101267030A CN201010126703A CN102195464A CN 102195464 A CN102195464 A CN 102195464A CN 2010101267030 A CN2010101267030 A CN 2010101267030A CN 201010126703 A CN201010126703 A CN 201010126703A CN 102195464 A CN102195464 A CN 102195464A
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- circuit
- power factor
- switching tube
- factor correction
- energy storage
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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
Abstract
The invention discloses a power factor correction circuit and a control method thereof, which can effectively improve the power factor and the efficiency and also has the advantages of simple circuit and low cost. The power factor correction circuit is characterized by comprising a rectifier bridge, a switching tube, a free wheeling diode and an energy storage inductor; and a discontinuous current mode is adopted, and the inductive current is made to lift linearly by making use of an on or off state of the switching tube, so that an absolute value of the inductive current follows an absolute value of the input voltage at the highest point in each period so as to realize power factor correction. A working mode that an integrated circuit (IC) is controlled by power factor correction (PFC) is banned by the invention, a dedicated switching tube and an IC peripheral circuit are saved, and the invention has the characteristics of simple circuit, low cost and high processing efficiency, accords with the sustainable development concept, has high applicability and is particularly suitable for low-cost and high-quality factor power conversion equipment.
Description
Technical field
The present invention relates to correcting circuit, specifically, relate to and can effectively improve power factor and efficient, and circuit is simple, with low cost, be particularly useful for a kind of circuit of power factor correction and the control method thereof of low cost, high quality factor electric energy converting equipment.
Background technology
Present circuit of power factor correction roughly can be divided into two big classes: a class is a passive power factor correcting circuit, it mainly is the angle of flow that enlarges input current by circuit design, comprising adopting big inductance of series connection after rectification, follow the purpose of input voltage waveform to reach input current, thereby improve quality factor, but improve limited in view of its quality factor, simultaneously, also have shortcomings such as volume is big, heaviness, thereby there is limitation in its scope of application; Another kind of is APFC, it is by the BOOST circuit of connecting between electrical network and the supply unit, reaching higher quality factor, and, for passive power factor correcting circuit, have advantages such as efficient height, circuit be simple and be widely used.
The mode of operation of above-mentioned APFC can be divided into continuously and discontinuous two kinds, controlling schemes has a lot, and the waveform that generally adopts the control input current removes to follow the waveform of input voltage, obtain higher power factor to reach power-factor improvement, mainly concentrate on two classes: a class is the PFC control IC, comes the conducting of control switch and ends by the average current detection circuit; Another kind of is the PFC control IC, comes the conducting of control switch and ends by the peak current detection circuit.
Up to now, no matter existing circuit of power factor correction adopts above-mentioned any pattern, all need to utilize the PFC control IC, and IC also comprises its peripheral circuit, thereby, all there are circuit complexity, the high deficiency of cost, so, along with the continuous progress of science and technology and the continual renovation of product are regenerated, existing circuit of power factor correction is still waiting further innovation.
Summary of the invention
The invention provides a kind of circuit of power factor correction and control method thereof,, simplified circuit keeping on the high basis of APFC efficient height, quality factor, reduced the use of electronic component, save resource, also improved working (machining) efficiency, more effectively reduced product cost.
Technical problem of the present invention realizes by following scheme: a kind of circuit of power factor correction is provided, it is characterized in that, comprise transformer, full bridge rectifier, switching tube, electric capacity, input capacitance, output capacitance, energy storage inductor, the first afterflow diode and the second afterflow diode; Described input capacitance is connected in parallel on the output of full bridge rectifier, one end ground connection of described full bridge rectifier, the other end connects an end of energy storage inductor, the other end of described energy storage inductor is connected and is connected the drain electrode of switching tube behind the second afterflow diode, the grid of described switching tube connects FM circuit, source ground, the drain electrode of the elementary connection switching tube of described transformer, the described first afterflow diode shunt transformer secondary, described capacitances in series is between the first afterflow diode and ground, one end of described output capacitance connects the elementary of transformer, other end ground connection.
A kind of control method of circuit of power factor correction is provided, it is characterized in that, comprise the correcting circuit that rectifier bridge, switching tube, afterflow diode, energy storage inductor are constituted, adopt the discontinuous current pattern, and utilize the conducting of switching tube or cut-off state to make linearly lifting of inductive current, thereby the peak of absolute value in each cycle that makes inductive current followed the absolute value of input voltage, realizes power factor correction.
Realize circuit of power factor correction of the present invention and control method thereof, has following advantage: the mode of operation of having banned the PFC control IC, special-purpose switching tube and IC peripheral circuit have been omitted, it is simple to have circuit, with low cost, the characteristics that working (machining) efficiency is high meet sustainable development view, have strengthened applicability.
Description of drawings
Fig. 1 is the circuit theory diagrams of circuit of power factor correction of the present invention and control method thereof.
Embodiment
Circuit theory diagrams as shown in Figure 1: comprise transformer T
1, full bridge rectifier B
1, switching tube Q
1, capacitor C
2, input capacitance C
3, output capacitance C
1, energy storage inductor L
2, the first afterflow diode D
2With the second afterflow diode D
5, input capacitance C
3Be connected in parallel on full bridge rectifier B
1Output, full bridge rectifier B
1An end ground connection, the other end connects energy storage inductor L
2An end, energy storage inductor L
2The other end second afterflow diode D that connects
5The back connects switching tube Q
1Drain electrode, switching tube Q
1Grid connect FM circuit, source ground, transformer T
1Elementary connection switching tube Q
1Drain electrode, the first afterflow diode D
2Shunt transformer T
1Secondary, capacitor C
2Be connected on the first afterflow diode D
2And between the ground, output capacitance C
1An end connect transformer T
1Elementary, other end ground connection.In the specific implementation, the first afterflow diode D
2And the second afterflow diode D
5The afterflow diode all adopts recovery type diode, and, preferred supper-fast recovery type diode, and switching tube Q
1Adopt field effect transistor.
In the specific implementation, adopt the discontinuous current pattern, comprise the correcting circuit that is constituted by rectifier bridge, switching tube, afterflow diode, energy storage inductor, adopt the discontinuous current pattern, and utilize the conducting of switching tube or cut-off state to make linearly lifting of inductive current, thereby the peak of absolute value in each cycle that makes inductive current followed the absolute value of input voltage, realizes power factor correction.Respectively in input and the corresponding employing input capacitance of output and the output capacitance filtering of correcting circuit, after the AC rectification through input capacitance filtering, connect the drain electrode of switching tube again by inductance and fly-wheel diode, be added to the positive pole of output capacitance then through the first winding of transformer.
Concrete operation principle and process are as follows: switching tube Q
1The switching frequency of switch is generally more than a few KHZ--hundreds of KHZ, and far above the frequency 47-63HZ of input power supply, thereby the input voltage in each switching cycle can be considered definite value substantially.Circuit can be considered a kind of DC-DC electric energy transducer in the switching cycle.Because the control input current operates under the discontinuous mode of operation, electric current after the rectification is after the filtering of input capacitance C3 input capacitance, behind energy storage inductor L2 again through sustained diode 5 (owing to be operated under the discontinuous conduction mode, to use Ultrafast recovery diode, can reduce like this to have improved reliability greatly owing to the long switching loss that causes of diode recovery time.Because resume speed is accelerated to make input current follow the waveform of input voltage better, Dui Ying raising just quality factor, be added to the drain electrode of switching tube, the anodal filtering that is added to output capacitance C1 through the first winding of transformer makes the transmission of electricity pressure more level and smooth in only, improves the reliability of entire circuit.When input supply voltage is timing, if when switching tube is conducting state, then the voltage on the inductance L 2 also be on the occasion of, inductance L 2 electric currents are by zero straight line rising; If switching tube is when being cut-off state, then on the inductance L 2 voltage also be negative value, inductive current is also reduced to zero from the highest straight line.When input supply voltage was negative value, because of the rectified action of the full-bridge rectifier of front end, its operation was same as positive half cycle.So make absolute value peak in each cycle of inductive current can follow the waveform of the absolute value of input voltage.In other words, the waveform of input current is followed the waveform of input voltage, thereby has realized power factor emendation function.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that specific embodiments of the present invention is confined to above-mentioned explanation.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (5)
1. a circuit of power factor correction is characterized in that: comprise transformer, full bridge rectifier, switching tube, electric capacity, input capacitance, output capacitance, energy storage inductor, the first afterflow diode and the second afterflow diode; Described input capacitance is connected in parallel on the output of full bridge rectifier, one end ground connection of described full bridge rectifier, the other end connects an end of energy storage inductor, the other end of described energy storage inductor is connected and is connected the drain electrode of switching tube behind the second afterflow diode, the grid of described switching tube connects FM circuit, source ground, the drain electrode of the elementary connection switching tube of described transformer, the described first afterflow diode shunt transformer secondary, described capacitances in series is between the first afterflow diode and ground, one end of described output capacitance connects the elementary of transformer, other end ground connection.
2. circuit of power factor correction according to claim 1 is characterized in that: described switching tube Q
1Be field effect transistor.
3. circuit of power factor correction according to claim 1 is characterized in that: described afterflow diode is a recovery type diode.
4. the control method of a circuit of power factor correction, it is characterized in that: comprise the correcting circuit that rectifier bridge, switching tube, afterflow diode, energy storage inductor are constituted, adopt the discontinuous current pattern, and utilize the conducting of switching tube or cut-off state to make linearly lifting of inductive current, thereby the peak of absolute value in each cycle that makes inductive current followed the absolute value of input voltage, realizes power factor correction.
5. the control method of circuit of power factor correction according to claim 4, it is characterized in that: input and the output at described correcting circuit is provided with input capacitance and output capacitance respectively, realizes the rectifying and wave-filtering to described correcting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101267030A CN102195464A (en) | 2010-03-16 | 2010-03-16 | Power factor correction circuit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101267030A CN102195464A (en) | 2010-03-16 | 2010-03-16 | Power factor correction circuit and control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102195464A true CN102195464A (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101267030A Pending CN102195464A (en) | 2010-03-16 | 2010-03-16 | Power factor correction circuit and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052934A (en) * | 2016-05-13 | 2016-10-26 | 中国电器科学研究院有限公司 | Indirect measuring apparatus for vehicle operation status parameter and calibration method |
-
2010
- 2010-03-16 CN CN2010101267030A patent/CN102195464A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106052934A (en) * | 2016-05-13 | 2016-10-26 | 中国电器科学研究院有限公司 | Indirect measuring apparatus for vehicle operation status parameter and calibration method |
| CN106052934B (en) * | 2016-05-13 | 2019-02-05 | 中国电器科学研究院有限公司 | A kind of running state of the vehicle parameter indirect measurement system and scaling method |
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| DD01 | Delivery of document by public notice |
Addressee: Liu Fei Document name: Notification of Publication of the Application for Invention |
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| DD01 | Delivery of document by public notice |
Addressee: Liu Fei Document name: Notification of before Expiration of Request of Examination as to Substance |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110921 |
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| WD01 | Invention patent application deemed withdrawn after publication |