CN204068686U - Pfc circuit - Google Patents
Pfc circuit Download PDFInfo
- Publication number
- CN204068686U CN204068686U CN201420517147.3U CN201420517147U CN204068686U CN 204068686 U CN204068686 U CN 204068686U CN 201420517147 U CN201420517147 U CN 201420517147U CN 204068686 U CN204068686 U CN 204068686U
- Authority
- CN
- China
- Prior art keywords
- pfc
- circuit
- switching tube
- branch road
- output end
- 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.)
- Active
Links
Classifications
-
- 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
Landscapes
- Rectifiers (AREA)
Abstract
Pfc circuit, relate to power factor correction technology field, it comprises rectifier, the input of rectifier connects electrical network, also comprise at least three PFC branch roads and filter capacitor, these at least three PFC branch road crisscross parallels, every bar PFC branch road includes the switching tube that controls break-make, this switching tube drives by pwm signal, described pwm signal has drive circuit to produce, the voltage that drive circuit inputs according to electrical network and phase place thereof, the voltage of the electric current of electrical network input and phase place and the output of this pfc circuit and the duty ratio of phase control said PWM signal thereof, thus power density is improved while correcting power factors, reduce the fluctuation of output voltage and reduce the ripple current of filter capacitor.
Description
Technical field
The utility model relates to power factor correction technology field, is specifically related to a kind of pfc circuit.
Background technology
In order to improve power factor, reduce Harmonics of Input content, in power electronic equipment, PFC (Power Factor Correction, power factor correction) circuit is mostly adopted to regulate.In existing pfc circuit, conventional single channel pfc circuit there is the shortcomings such as power density is low, output voltage ripple large, the ripple current of filter capacitor is large.
Summary of the invention
For the problems referred to above of prior art, the utility model provides a kind of pfc circuit, its ripple current that can improve power density, reduce the fluctuation of output voltage and reduce filter capacitor.
For achieving the above object, the utility model provides following technical scheme.
Pfc circuit, comprise rectifier, the input of rectifier connects electrical network, also comprise at least three PFC branch roads and filter capacitor, every bar PFC branch road comprises diode, inductance and switching tube, the diode of every bar PFC branch road is connected between this pfc circuit cathode output end and cathode output end after connecting with two controlled conduction terminal of switching tube, wherein, the negative pole of diode connects the cathode output end of this pfc circuit, inductance one end of every bar PFC branch road connects the cathode output end of described rectifier, the other end is connected to the diode of this PFC branch road and the contact of switching tube, filter capacitor is connected across between the cathode output end of this pfc circuit and cathode output end, this pfc circuit also comprises input voltage detection circuit, input electric cur-rent measure circuit, output voltage detecting circuit and drive circuit, input voltage detection circuit is connected across between described rectifier anode output and cathode output end, input electric cur-rent measure circuit is connected between the contact of the cathode output end of described rectifier and the switching tube of each bar PFC branch road, output voltage detecting circuit is connected across this PFC between converter positive output and cathode output end, drive circuit produce at least three road pwm signals and the control end this at least three roads pwm signal being exported respectively to the switching tube of each bar PFC branch road to control the break-make of the switching tube of each bar PFC branch road respectively, the voltage that drive circuit detects according to input voltage detection circuit and phase place thereof, input electric cur-rent measure electric circuit inspection to electric current and the voltage that detects of phase place and output voltage detecting circuit and phase place thereof control respectively described in the duty ratio of at least three road pwm signals, turn-on instant interval T/the n of the switching tube of each bar PFC branch road, described turn-on instant refers to that switching tube is the moment of conducting state by cut-off state saltus step, T is the switch periods of the PWM copped wave of this pfc circuit, n is the quantity of PFC branch road.
Wherein, 4 PFC branch roads are had.
Wherein, described rectifier is full-bridge rectifier.
Wherein, described switching tube is IGBT.
The beneficial effects of the utility model are: adopt at least three PFC branch circuit parallel connections between rectifier and the output (output terminating load) of this pfc circuit, compare single channel pfc circuit, improve power density.Each bar PFC branch road interlocks conducting, the voltage that drive circuit detects according to input voltage detection circuit and phase place thereof, input electric cur-rent measure electric circuit inspection to electric current and the voltage that detects of phase place and output voltage detecting circuit and phase place thereof control the duty ratio of the pwm signal of the break-make of the switching tube for controlling each bar PFC branch road respectively, the input and output current ripples of each PFC branch road can partly or completely be offset, substantially reduce the ripple of the input and output electric current of each PFC branch road, thus reduce the disturbance of pfc circuit to input voltage, reduce common mode EMI interference (electromagnetic interference) of pfc circuit, also increase the output voltage of pfc circuit and the vibration frequency of output current, reduce the fluctuation of output voltage, reduce the ripple current of filter capacitor.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of pfc circuit of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
As shown in Figure 1, the pfc circuit of the present embodiment comprises full-bridge rectifier B1, input voltage detection circuit, input electric cur-rent measure circuit, output voltage detecting circuit, drive circuit, filter capacitor C1 and four PFC branch road is formed, these four articles of PFC branch roads are respectively a PFC branch road, 2nd PFC branch road, 3rd PFC branch road and the 4th PFC branch road, wherein a PFC props up route diode D1, inductance L 1 and IGBT switch VT1 are formed, 2nd PFC props up route diode D2, inductance L 2 and IGBT switch VT2 are formed, 3rd PFC props up route diode D3, inductance L 3 and IGBT switch VT3 are formed, 4th PFC props up route diode D4, inductance L 4 and IGBT switch VT4 are formed.Two controlled conduction terminal series connection of diode D1 and IGBT switch VT1, one end of inductance L 1 is connected to the contact of diode D1 and IGBT switch VT1, two controlled conduction terminal series connection of diode D2 and IGBT switch VT2, one end of inductance L 2 is connected to the contact of diode D2 and IGBT switch VT2, two controlled conduction terminal series connection of diode D3 and IGBT switch VT3, one end of inductance L 3 is connected to the contact of diode D3 and IGBT switch VT3, two controlled conduction terminal series connection of diode D4 and IGBT switch VT4, one end of inductance L 4 is connected to the contact of diode D4 and IGBT switch VT4, inductance L 1, L2, the cathode output end of full-bridge rectifier B1 is connected to after the other end of L3 and L4 is connected to each other, diode D1, D2, the cathode output end OUT+ of this pfc circuit is connected to after the negative pole of D3 and D4 is connected to each other, IGBT switch VT1, IGBT switch VT2, the cathode output end OUT-of this pfc circuit is connected to after one end of IGBT switch VT3 and IGBT switch VT4 is connected to each other.Input voltage detection circuit is connected across between full-bridge rectifier B1 cathode output end and cathode output end, input electric cur-rent measure circuit is connected between the contact of the cathode output end of full-bridge rectifier B1 and the switching tube of each bar PFC branch road, output voltage detecting circuit is connected across this PFC between converter positive output OUT+ and cathode output end OUT-, drive circuit input connects input voltage detection circuit respectively, input electric cur-rent measure circuit and output voltage detecting circuit, output connects IGBT switch VT1 respectively, IGBT switch VT2, the control end of IGBT switch VT3 and IGBT switch VT4.Drive circuit produces the control end that four road pwm signals export IGBT switch VT1, IGBT switch VT2, IGBT switch VT3 and IGBT switch VT4 respectively to, turn-on instant interval T/4 of IGBT switch VT1, IGBT switch VT2, IGBT switch VT3 and IGBT switch VT4, described turn-on instant refers to that switching tube is the moment of conducting state by cut-off state saltus step, and T is the switch periods of the PWM copped wave of this pfc circuit.The voltage that drive circuit detects according to input voltage detection circuit and phase place thereof, input electric cur-rent measure electric circuit inspection to electric current and the voltage that detects of phase place and output voltage detecting circuit and phase place thereof control the duty ratio of described four road pwm signals respectively, thus control the phase place of electrical network input current and the Phase synchronization of line voltage, and to control electrical network input current be sinusoidal waveform, reach the object of capability correction.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not the restriction to the utility model protection range; although done to explain to the utility model with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to the technical solution of the utility model or equivalent replacement, and not depart from essence and the scope of technical solutions of the utility model.
Claims (4)
1.PFC circuit, comprise rectifier, the input of rectifier connects electrical network, it is characterized in that, also comprise at least three PFC branch roads and filter capacitor, every bar PFC branch road comprises diode, inductance and switching tube, the diode of every bar PFC branch road is connected between this pfc circuit cathode output end and cathode output end after connecting with two controlled conduction terminal of switching tube, wherein, the negative pole of diode connects the cathode output end of this pfc circuit, inductance one end of every bar PFC branch road connects the cathode output end of described rectifier, the other end is connected to the diode of this PFC branch road and the contact of switching tube, filter capacitor is connected across between the cathode output end of this pfc circuit and cathode output end, this pfc circuit also comprises input voltage detection circuit, input electric cur-rent measure circuit, output voltage detecting circuit and drive circuit, input voltage detection circuit is connected across between described rectifier anode output and cathode output end, input electric cur-rent measure circuit is connected between the contact of the cathode output end of described rectifier and the switching tube of each bar PFC branch road, output voltage detecting circuit is connected across this PFC between converter positive output and cathode output end, drive circuit produce at least three road pwm signals and the control end this at least three roads pwm signal being exported respectively to the switching tube of each bar PFC branch road to control the break-make of the switching tube of each bar PFC branch road respectively, the voltage that drive circuit detects according to input voltage detection circuit and phase place thereof, input electric cur-rent measure electric circuit inspection to electric current and the voltage that detects of phase place and output voltage detecting circuit and phase place thereof control respectively described in the duty ratio of at least three road pwm signals, turn-on instant interval T/the n of the switching tube of each bar PFC branch road, described turn-on instant refers to that switching tube is the moment of conducting state by cut-off state saltus step, T is the switch periods of the PWM copped wave of this pfc circuit, n is the quantity of PFC branch road.
2. pfc circuit according to claim 1, is characterized in that, has 4 PFC branch roads.
3. pfc circuit according to claim 1, is characterized in that, described rectifier is full-bridge rectifier.
4. pfc circuit according to claim 1, is characterized in that, described switching tube is IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420517147.3U CN204068686U (en) | 2014-09-10 | 2014-09-10 | Pfc circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420517147.3U CN204068686U (en) | 2014-09-10 | 2014-09-10 | Pfc circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204068686U true CN204068686U (en) | 2014-12-31 |
Family
ID=52210128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420517147.3U Active CN204068686U (en) | 2014-09-10 | 2014-09-10 | Pfc circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204068686U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790548A (en) * | 2016-04-08 | 2016-07-20 | 华中科技大学 | Three-channel interlaced PFC circuit for frequency converter and channel management method |
| CN108923636A (en) * | 2018-07-11 | 2018-11-30 | 佛山市众盈电子有限公司 | A kind of pfc circuit |
-
2014
- 2014-09-10 CN CN201420517147.3U patent/CN204068686U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790548A (en) * | 2016-04-08 | 2016-07-20 | 华中科技大学 | Three-channel interlaced PFC circuit for frequency converter and channel management method |
| CN108923636A (en) * | 2018-07-11 | 2018-11-30 | 佛山市众盈电子有限公司 | A kind of pfc circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103414334B (en) | PF is the long-life DCM Boost pfc converter of 1 | |
| CN203747686U (en) | Single-phase mixed three-level grid-connected inverter | |
| CN103066865B (en) | Three-phase Bridgeless power factor correction A.C.-D.C. converter | |
| CN104467433A (en) | Method and device for controlling critical continuous mode unit power factor flyback converter | |
| CN102545565A (en) | Single-stage high power factor correction conversion method and device for low output power frequency ripples | |
| CN104917398A (en) | Four-quadrant high-voltage frequency converter free from network-side reactor | |
| CN105356784A (en) | Grid connected inverter with DC bus voltage balance function | |
| CN105262356A (en) | Input capacitance self voltage-equalizing method for five-level full bridge grid-connected inverter | |
| CN104967323A (en) | Low-output-voltage-ripple discontinuous-mode flyback power factor correction converter | |
| CN103178704B (en) | A kind of power factor compensation circuit being applicable to peak value comparison method | |
| CN101783608A (en) | Minimum-voltage, active-clamp and three-phase grid-connected inverter | |
| CN100401625C (en) | Active passive mixed single phase power factor correcting circuit | |
| CN103683952B (en) | A kind of integration in parallel connection formula Buck-Flyback power factor correction pfc converter topology | |
| CN204068686U (en) | Pfc circuit | |
| CN104753336A (en) | PFC circuit | |
| CN102496932A (en) | Parallel voltage sag compensation device | |
| CN102983730A (en) | Direct-current harmonic suppression system and method of double reversed star-like rectification system | |
| CN102769394B (en) | Single-phase controllable rectification circuit | |
| CN104578797A (en) | Method and device for controlling discontinuous mode flyback converter with high power factor and high efficiency | |
| CN203708111U (en) | Parallel connection integrated-type Buck-Flyback power factor correction device | |
| CN204290730U (en) | A kind of control device of High Power Factor high efficiency anti exciting converter of discontinuous mode | |
| CN105429452A (en) | Common-mode rejection dual-Boost bridgeless PFC converter | |
| CN102611296B (en) | Switch switching-off triggering circuit and power factor correction circuit | |
| CN202395667U (en) | Switch power supply circuit with small voltage output ripple | |
| CN108683330A (en) | A kind of three switching tube three-phase pfc circuit control methods and serial topological structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |