CN201994843U - Power factor corrector for soft switch - Google Patents
Power factor corrector for soft switch Download PDFInfo
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- CN201994843U CN201994843U CN2010205776092U CN201020577609U CN201994843U CN 201994843 U CN201994843 U CN 201994843U CN 2010205776092 U CN2010205776092 U CN 2010205776092U CN 201020577609 U CN201020577609 U CN 201020577609U CN 201994843 U CN201994843 U CN 201994843U
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- diode
- switch
- circuit
- power factor
- auxiliary
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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
Abstract
The utility model relates to a power factor corrector, in particular to a power factor corrector for a soft switch. In the prior art, the defect exists in improving switching frequency, so that the improvement of the performance of a power factor correcting circuit is limited. Aiming at overcoming the defect in the prior art, the technical scheme adopted in the utility model is as follows: the power factor corrector for the soft switch comprises a bridge rectifier circuit and a direct-current (DC) switch booster circuit, and also comprises an auxiliary circuit, wherein the auxiliary circuit consists of a resonant inductor, a capacitor, an auxiliary switch tube, a sixth diode and a seventh diode. In the utility model, a resonant circuit is formed by utilizing the inductor and the capacitor of the auxiliary circuit, so as to not only realize zero-voltage switching of a main switch and zero-voltage turn-off of a main diode, but also realize the zero-voltage switching of an auxiliary switch, the auxiliary switch tube, the sixth diode and the seventh diode, and greatly improve the power of a switching circuit.
Description
Technical field
The utility model relates to a kind of power factor corrector, relates in particular to a kind of soft switch power factor correcting device.
Background technology
Along with the extensive use of electronic equipment, the harmonic wave that electronic equipment produces becomes the key factor that influences the quality of power supply.Before the nineties in 20th century, for head it off, adopt passive techniques that first-harmonic is carried out phase shift compensation usually or suppress the harmonic wave of some appointment, just the passive PFC of often saying.Usually implementation method is: adopt the inductance compensation method, reduce to exchange phase difference between the fundamental current of input and the voltage, thereby reach the purpose that improves power factor.But adopt the power supply of passive PFC, power factor can only reach 0.7～0.8, and owing to adopt inductance, electric capacity to compensate, and volume, weight are relatively large.After the nineties in 20th century, along with being extensive use of of power electronic technology, the method that solves harmonic problem has obtained bigger progress, main effective way has two: a kind ofly be at the public load end of electrical network and connect the power conversion circuit of a special use, idle and harmonic current are compensated, Here it is active filter (Active Filter), it is compensated for as sinusoidal current with the line voltage homophase with power network current; Another kind is to increase a power conversion circuit between rectification circuit and filter capacitor, Here it is Active Power Factor Correction APFC(Active Power Factor Correction, be called for short APFC), it is corrected into sine wave with the line voltage homophase with the rectifier input current, eliminated harmonic wave and reactive current, thereby power factor can be brought up to and is approximately 1.0.
Active Power Factor Correction Technology becomes the focus of power electronic technology research from the later stage eighties 20th century, and the various countries scholar is just carrying out research and analysis in depth from circuit topology, control strategy, modeling analysis equal angles.
Situation from present research, in the APFC circuit, the DC/DC conversion stage generally adopts PWM hard switching technology, because the shortcoming that improves aspect such as open pipe frequency again of hard switching technology, limited the raising of circuit of power factor correction performance, promptly can only use by the low power range in hundreds of watts.If in circuit of power factor correction, use soft switch technique, just can reduce the switching loss and the electromagnetic interference (EMI) of power tube greatly, operating frequency and power can further improve, thereby obtain higher operating efficiency.
Summary of the invention
In order to overcome the defective of power factor corrector in the past, the purpose of this utility model provides a kind of high workload efficient, high power density, the soft switch power factor correcting device of small size.
To achieve these goals, the technical solution adopted in the utility model is:
A kind of soft switch power factor correcting device, comprise bridge rectifier and dc switch booster circuit, described bridge rectifier is made up of four rectifier diodes, the common cathode of rectifier diode links to each other with power cathode, anode links to each other with positive source altogether, described dc switch booster circuit is by inductance, main switch and the 5th diode are formed, inductance one end links to each other with above-mentioned rectifier diode negative electrode, the other end connects the collector electrode of main switch and the anode of the 5th diode, the emitter of main switch links to each other with the anode of above-mentioned rectifier diode and ground connection, it is characterized in that: described soft switch power factor correcting device also comprises auxiliary circuit, described auxiliary circuit is by resonant inductance, electric capacity, auxiliary switch, the 6th diode and the 7th diode constitute, the two poles of the earth of electric capacity link to each other with the collector and emitter of main switch respectively, resonant inductance one end connects the anode of above-mentioned inductance and the 5th diode, the other end connects the anode of the 6th diode and the 7th diode, the negative electrode of the 7th diode connects the collector electrode of auxiliary switch, and the 5th diode links to each other with the negative electrode of the 6th diode.
007] compared with prior art, the utility model has the advantages that:
High efficiency soft switch power factor correcting device of the present utility model comprises that bridge rectifier reaches by inductance L, the dc switch booster circuit that main switch Qmain and the 5th diode constitute, also include resonant inductance Lr, capacitor C r, auxiliary switch Qzvt, the auxiliary circuit that the 6th diode and the 7th diode are formed, this power factor corrector is simple in structure, owing to utilize the auxiliary induction Lr of auxiliary circuit, electric capacity constitutes resonant circuit, can realize the zero voltage switch of main switch, the no-voltage of main diode is turn-offed, can realize the auxiliary switch auxiliary switch again, the zero voltage switch of the 6th diode and the 7th diode can reduce power loss effectively, increases switching frequency, improve power density, significantly improve the operating efficiency of adjuster.
Description of drawings
Fig. 1 is a structural representation of the present utility model,
Fig. 2 is the course of work schematic diagram of circuit in the switch periods.
Embodiment
Below in conjunction with Figure of description and specific embodiment the present invention is further specified.
Referring to Fig. 1, a kind of soft switch power factor correcting device, comprise bridge rectifier and dc switch booster circuit, described bridge rectifier is by four rectifier diode D1, D2, D3, D4 forms, the common cathode of rectifier diode links to each other with power cathode, anode links to each other with positive source altogether, described dc switch booster circuit is by inductance L, main switch Qmain and the 5th diode D5 form, inductance L one end links to each other with above-mentioned rectifier diode negative electrode, the other end connects the collector electrode of main switch Qmain and the anode of the 5th diode D5, the emitter of main switch Qmain links to each other with the anode of above-mentioned rectifier diode and ground connection, it is characterized in that: described soft switch power factor correcting device also comprises auxiliary circuit, described auxiliary circuit is by resonant inductance Lr, capacitor C r, auxiliary switch Qzvt, the 6th diode D6 and the 7th diode D7 constitute, the two poles of the earth of capacitor C r link to each other with the collector and emitter of main switch Qmain respectively, resonant inductance Lr one end connects the anode of above-mentioned inductance L and the 5th diode D5, the other end connects the anode of the 6th diode D6 and the 7th diode D7, the negative electrode of the 7th diode D7 connects the collector electrode of auxiliary switch Qzvt, and the negative electrode of the 5th diode D5 and the 6th diode D6 links to each other.
[0011] referring to Fig. 2, the course of work of soft switch power factor correcting device of the present utility model is as follows:
1) output capacitance is enough big, thereby guarantees that output voltage is constant and ripple is less relatively; 2) the input power supply is an ideal source; 3) the chopper inductance is far longer than resonant inductance Lr; 4) before auxiliary switch Qzvt conducting, resonant inductance Lr, the electric current on the capacitor C r are zero.
Referring to Fig. 2, initially to t0 in the time, main switch is closed before t0 ~ t1, and whole load current Io are flow through in the 5th diode D5 conducting.At t0 constantly, auxiliary switch Qzvt conducting, conducting along with auxiliary switch Qzvt, electric current among the resonant inductance Lr is linear and rises, until Iin, at this moment, electric current among the 5th diode D5 is to downslide, when diode current reached 0, the 5th diode was closed (being that D5 is soft closes), was the reverse recovery of diode in side circuit.
During this time, the electric current of resonant inductance Lr reaches Iin when t1, and resonant inductance Lr, and capacitor C r begins resonance, and this harmonic period is 0 for the voltage that capacitor C r begins to discharge until it.During this end cycle, the body diode conducting of main switch Qmain.
During this time, when this stage began, the drain voltage of switch had reached 0V, and body diode is conducting also, and the electric current by diode is driven by the zero voltage transition inductance.Voltage on the inductance is 0, so electric current is free samsara.At this moment, main switch Qmain can conducting, realizes zero voltage switch.
During this time, when t3, UC3855 detects the drain voltage of main switch Qmain and reduces to 0.Make main switch Qmain conducting, close auxiliary switch Qzvt, the energy among the resonant inductance Lr is linear and is discharged into load by D6.
During this time, at t4 constantly, the electric current among the 6th diode D6 reduces to 0, and this moment, circuit was worked according to traditional boost.
During this time, also the same work of this stage with traditional DC voltage booster circuit.Drain-source junction capacitance when main switch Qmain closes is charged to output voltage U o, and main switch Qmain begins power supply and flows to load, and at this moment, the initial maintenance electric leakage of node capacitor is pressed onto 0V, closes loss and effectively reduces.
Claims (1)
1. soft switch power factor correcting device, comprise bridge rectifier and dc switch booster circuit, described bridge rectifier is by four rectifier diode (D1, D2, D3, D4) form, the common cathode of rectifier diode links to each other with power cathode, anode links to each other with positive source altogether, described dc switch booster circuit is by inductance (L), main switch (Qmain) and the 5th diode (D5) are formed, inductance (L) end links to each other with above-mentioned rectifier diode negative electrode, the other end connects the collector electrode of main switch (Qmain) and the anode of the 5th diode (D5), the emitter of main switch (Qmain) and the anode of above-mentioned rectifier diode link to each other and ground connection, it is characterized in that: described soft switch power factor correcting device also comprises auxiliary circuit, described auxiliary circuit is by resonant inductance (Lr), electric capacity (Cr), auxiliary switch (Qzvt), the 6th diode (D6) and the 7th diode (D7) constitute, the two poles of the earth of electric capacity (Cr) link to each other with the collector and emitter of main switch (Qmain) respectively, resonant inductance (Lr) end connects the anode of above-mentioned inductance (L) and the 5th diode (D5), the other end connects the anode of the 6th diode (D6) and the 7th diode (D7), the negative electrode of the 7th diode (D7) connects the collector electrode of auxiliary switch (Qzvt), and the 5th diode (D5) links to each other with the negative electrode of the 6th diode (D6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205776092U CN201994843U (en) | 2011-02-16 | 2011-02-16 | Power factor corrector for soft switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205776092U CN201994843U (en) | 2011-02-16 | 2011-02-16 | Power factor corrector for soft switch |
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| Publication Number | Publication Date |
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| CN201994843U true CN201994843U (en) | 2011-09-28 |
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| CN2010205776092U Expired - Fee Related CN201994843U (en) | 2011-02-16 | 2011-02-16 | Power factor corrector for soft switch |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832802A (en) * | 2012-09-10 | 2012-12-19 | 华为技术有限公司 | PFC (power factor correction) circuit, communication power supply equipment and control method of PFC circuit |
| CN103795235A (en) * | 2012-10-31 | 2014-05-14 | 三星电机株式会社 | Power factor correction circuit and power supply device including the same |
| CN103795236A (en) * | 2012-10-30 | 2014-05-14 | 三星电机株式会社 | Power factor correction circuit and method for controlling power factor correction |
| CN103973097A (en) * | 2014-05-07 | 2014-08-06 | 魏其萃 | Active valley-filled alternating-current and direct-current converter for improving power factor efficiency |
-
2011
- 2011-02-16 CN CN2010205776092U patent/CN201994843U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832802A (en) * | 2012-09-10 | 2012-12-19 | 华为技术有限公司 | PFC (power factor correction) circuit, communication power supply equipment and control method of PFC circuit |
| CN102832802B (en) * | 2012-09-10 | 2014-12-17 | 华为技术有限公司 | PFC (power factor correction) circuit, communication power supply equipment and control method of PFC circuit |
| CN103795236A (en) * | 2012-10-30 | 2014-05-14 | 三星电机株式会社 | Power factor correction circuit and method for controlling power factor correction |
| CN103795236B (en) * | 2012-10-30 | 2017-04-12 | 三星电机株式会社 | Power factor correction circuit and method for controlling power factor correction |
| CN103795235A (en) * | 2012-10-31 | 2014-05-14 | 三星电机株式会社 | Power factor correction circuit and power supply device including the same |
| CN103795235B (en) * | 2012-10-31 | 2016-06-29 | 三星电机株式会社 | Circuit of power factor correction and include the supply unit of this circuit |
| CN103973097A (en) * | 2014-05-07 | 2014-08-06 | 魏其萃 | Active valley-filled alternating-current and direct-current converter for improving power factor efficiency |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110928 Termination date: 20120216 |