CN107070195A - The totem circuit of power factor correction of half power frequency period resonant type soft-switch structure - Google Patents
The totem circuit of power factor correction of half power frequency period resonant type soft-switch structure Download PDFInfo
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- CN107070195A CN107070195A CN201710173327.2A CN201710173327A CN107070195A CN 107070195 A CN107070195 A CN 107070195A CN 201710173327 A CN201710173327 A CN 201710173327A CN 107070195 A CN107070195 A CN 107070195A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
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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
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
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Abstract
The present invention relates to a kind of totem circuit of power factor correction of half power frequency period resonant type soft-switch structure, including：The main power circuit of totem topology, the totem PFC is realized the auxiliary switching circuit of resonant type soft-switch, input voltage zero-crossing detection circuit, input electric cur- rent measure circuit, output voltage detecting circuit and detect according to the voltage over zero circuit, the signal of input electric cur- rent measure circuit and output voltage detecting circuit controls the control circuit of the main power circuit and the auxiliary switching circuit；The control circuit is according to the detection signal of the output voltage detecting circuit, input electric cur- rent measure circuit and input voltage zero-crossing detection circuit come output driving pulse, to control the auxiliary switching circuit and the totem circuit of power factor correction to realize resonance, the power switch pipe of the totem PFC is set to realize that no-voltage is open-minded in half of power frequency period, so as to reduce the switching loss of main circuit, overall efficiency is improved.
Description
Technical field
The present invention relates to a kind of single phase power factor correcting circuit (PFC), more particularly to one kind can be in half of power frequency period
The circuit of power factor correction (PFC) of the interior totem pole configuration for carrying out resonant type soft-switch.
Background technology
High efficiency, High Power Factor, low cost are always the developing goal of circuit of power factor correction (PFC) technology.Figure
The PFC of rod structure is risen compared with conventional full-bridge PFC, Dual Boost PFC etc., its power semiconductor quantity used
The reverse recovery loss of less, the work of its power frequency diode is also small, with the advantage in terms of efficiency, cost.However, at present
Some totem pole configuration PFC power switch pipe is more to work under hard switching state, and its switching loss and voltage stress are larger.With
The development of the high-speed semiconductor switching device technology of new generation such as gallium nitride (GaN), carborundum (SiC), speed-sensitive switch is to PFC skills
Art also brings new technology challenge and opportunity, and further improvement totem pole configuration PFC efficiency and performance, which just turns into have, well should
With the technique direction of prospect.
For example, (the China Patent Publication No. of patent document 1：CN104852567A a kind of Sofe Switch totem) is disclosed without bridge
Power factor correction circuit, including the sampling of boost inductance, input current, totem are without bridge topology, resonance passive network, filtered electrical
Road, output voltage sampling, control circuit, voltage zero-cross detection.By totem without on bridge topological main circuit increase inductance, electricity
The resonant network that appearance, diode passive element are constituted, each PWM of two switching devices of control in input power positive-negative half-cycle
During dutycycle, one as main switch, one as resonant switch, realization need not increase auxiliary power switch can ensure totem
Post without upper two switching devices of bridge topology be operated in no-voltage conducting, zero-current switching Sofe Switch state, circuit efficiency obtains
Larger raising is arrived.But, the program can only realize Sofe Switch in power network whole cycle, i.e., positive half cycle and negative half period.
The content of the invention
Present invention solves the technical problem that being：In order to improve the loss technology that existing totem pole configuration PFC hard switchings are caused
Problem, builds a kind of totem PFC for the new construction that resonant type soft-switch can be realized in half of power frequency period.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of totem circuit of power factor correction of half power frequency period resonant type soft-switch structure, including totem topology
Main power circuit, the totem PFC is realized the auxiliary switching circuit of resonant type soft-switch, input voltage zero-crossing examination electricity
Road, input electric cur- rent measure circuit, output voltage detecting circuit and according to the voltage over zero detect circuit, input current
The signal of detection circuit and output voltage detecting circuit controls the control of the main power circuit and the auxiliary switching circuit
Circuit；The control circuit is examined according to the output voltage detecting circuit, input electric cur- rent measure circuit and input voltage zero crossing
The detection signal of slowdown monitoring circuit carrys out output driving pulse, to control the auxiliary switching circuit and the totem PFC
Circuit realiration resonance, makes the power switch pipe of the totem PFC realize that no-voltage is open-minded in half of power frequency period, so as to subtract
The switching loss of few main circuit, improves overall efficiency.
The present invention further technical scheme be：The main power circuit of the totem topology includes power semiconductor switch
S1, power semiconductor switch S2, power semiconductor switch Q1, power semiconductor switch Q2, boost inductance L1；The boost inductance L1
One end connects S1Drain electrode and S2Source electrode, the other end connect input single-phase alternating current live wire L ends, the S1Source electrode connection
The negative pole of DC output end, the S2Drain electrode connection DC output end positive pole, the Q1Negative pole and the Q2Positive pole be total to
With the zero line N-terminal of connection input single-phase alternating current, the Q1Positive pole connect the negative pole of DC output end, the Q2Negative pole in succession
Connect the positive pole of VD, the S1、S2Gate pole connection from it is described control circuit driving pulse.
The present invention further technical scheme be：The auxiliary switching circuit includes power semiconductor switch Sr, resonance electricity
Hold Csa, resonant inductance Lr, fast recovery diode Dr1And Dr2；The SrSource electrode be connected with DC output end negative pole, resonant inductance
LrConnect the SrDrain electrode and the Dr1Negative pole, the Dr2Positive pole connect the SrDrain electrode, Dr3Negative pole connection it is straight
Flow the positive pole of output end, the Dr1Positive pole connect the power semiconductor switch S1Drain electrode and the power semiconductor switch
S2Source electrode, the resonant capacitance CsaConnect DC output end negative pole and the power semiconductor switch S1Drain electrode, the Sr's
Driving pulse of the gate pole connection from control circuit.
The present invention further technical scheme be：The control circuit is adopted with the main power circuit, the auxiliary circuit
With the mode of isolation drive.
The present invention further technical scheme be：It is described to control circuit to be DSP.
The present invention further technical scheme be：Described control circuit is according to the output voltage detecting circuit, described
Input electric cur- rent measure circuit, the detection signal of the input voltage zero-crossing detection circuit determine each driving pulse dutycycle and
Phase simultaneously produces driving pulse, makes the switch of the totem PFC main circuit, the auxiliary circuit by fixed frequency
Rate works.
The present invention further technical scheme be：The driving pulse that the control circuit is exported to the auxiliary switching circuit
Signal is ahead of the drive pulse signal exported to the main power circuit, and the advanced time is td, and td≥t01+t12, wherein,
t01It is resonant inductance electric current iLrStart to rise to inductive current i from above freezingL1Time, i.e.,V0For output end direct current
Magnitude of voltage, LrFor resonant inductance value；t12It is resonant switch SrAfter opening, electric capacity CsaResonant discharge, until electric capacity CsaVoltage is zero
Time,CsaFor resonant capacitance value.
The present invention further technical scheme be：The power semiconductor switch S1And S2For appointing in GaN, MOS, IGBT
One kind, the power semiconductor switch Q1And Q2For any of GaN, MOS, IGBT or fast recovery diode.
The solution have the advantages that：Construct a kind of can realize the totem of resonant type soft-switch in half of power frequency period
The circuit of power factor correction (PFC) of structure.The present invention is on the basis of totem PFC is used as main power circuit, design
Resonant type soft-switch auxiliary circuit, it is open-minded to realize no-voltage to the power switch pipe of the totem PFC, reduces switch and damages
Consumption, improves the overall efficiency of power supply.The present invention is, according to resonant type soft-switch principle, using resonance phenomena, to make main switching device
In voltage or electric current by the change of sinusoidal or quasi sine rule.Make main switching device open-minded when voltage natural zero-crossing, or electric current
During natural zero-crossing, turn off main switching device, so as to reduce loss.
Brief description of the drawings
Fig. 1 is the totem PFC of half power frequency period resonant type soft-switch of the invention schematic diagram；
Fig. 2 is the circuit diagram of the totem PFC of present invention main power circuit；
Fig. 3 is the totem PFC of present invention auxiliary switching circuit figure；
Fig. 4 is the totem PFC of present invention mains voltage, current waveform；
Control circuit output drive signal sequential and main circuit Vital Voltage, electric current that Fig. 5 is the totem PFC of the present invention
Waveform.
Embodiment
With reference to specific embodiment, technical solution of the present invention is further illustrated.
As shown in figure 1, the present invention's can realize the totem power factor school of resonant type soft-switch in half of power frequency period
Positive circuit (PFC), including totem topology main power circuit, the auxiliary of resonant type soft-switch, which is opened, to be realized to the totem PFC
Powered-down road, input voltage zero-crossing detection circuit, input electric cur- rent measure circuit, output voltage detecting circuit and according to described
Voltage over zero detects the signal of circuit, input electric cur- rent measure circuit and output voltage detecting circuit to control the main power electricity
Road and the control circuit of the auxiliary switching circuit.The control circuit is according to the output voltage detecting circuit, input current
The detection signal of detection circuit and input voltage zero-crossing detection circuit carrys out output driving pulse, to control the auxiliary switch electricity
Road and the totem circuit of power factor correction realize resonance, make the power switch pipe of the totem PFC in half of power frequency
Realize that no-voltage is open-minded in cycle, so as to reduce the switching loss of main circuit, improve overall efficiency.
In the specific embodiment of the present invention, the control circuit is examined according to the output voltage detecting circuit, input current
Slowdown monitoring circuit, the detection signal of input voltage zero-crossing detection circuit determine the dutycycle and phase of each driving pulse and produce driving
Pulse, makes the main power circuit, the switch of the auxiliary circuit be worked by fixed frequency, and the control circuit is to described
The drive pulse signal of auxiliary circuit output is always ahead of the drive pulse signal of output.Circuit is controlled to control electricity using DSP
Road.
In the specific embodiment of the present invention, as shown in Figure 2, the main power circuit of the totem topology includes power half
Conductor switchs S1, power semiconductor switch S2, power semiconductor switch Q1, power semiconductor switch Q2, boost inductance L1.The liter
Voltage inductance L1One end connects S1Drain electrode and S2Source electrode, the other end connect input single-phase alternating current live wire L ends, the S1's
Source electrode connects the negative pole of DC output end, the S2Drain electrode connection DC output end positive pole, the Q1Negative pole and the Q2
Positive pole connect the zero line N-terminal of input single-phase alternating current, the Q jointly1Positive pole connect the negative pole of DC output end, the Q2's
Negative pole connects the positive pole of VD, the S in succession1、S2Gate pole connection from it is described control circuit driving pulse.Tool
In body embodiment, the power semiconductor switch S1、S2Can be any of GaN, MOS, IGBT, the power semiconductor is opened
Close Q1、Q2Can be any of fast recovery diode, synchronous rectification GaN, synchronous rectification MOS.
In the specific embodiment of the present invention, the auxiliary switching circuit includes power semiconductor switch Sr, resonant capacitance Csa、
Resonant inductance Lr, fast recovery diode Dr1And Dr2.The SrSource electrode be connected with DC output end negative pole, resonant inductance LrConnection
The SrDrain electrode and the Dr1Negative pole, the Dr2Positive pole connect the SrDrain electrode, Dr3Negative pole connection direct current output
The positive pole at end, the Dr1Positive pole connect the power semiconductor switch S1Drain electrode and the power semiconductor switch S2Source
Pole, the resonant capacitance CsaConnect DC output end negative pole and the power semiconductor switch S1Drain electrode, the SrGate pole
Connect the driving pulse from control circuit.The control circuit is used with the main power circuit, the auxiliary circuit isolates
The mode of driving.Accompanying drawing 2 shows the auxiliary switching circuit and its connection in the totem PFC, and accompanying drawing 3 specifically shows
The structure of auxiliary switching circuit is gone out.
Specific work process is：Single phase ac input voltage is rectified output after the main power circuit of totem pole configuration
DC voltage V0, control circuit according to output voltage detecting circuit detection signal, the detection signal of input electric cur- rent measure circuit,
The detection signal of input voltage zero-crossing detection circuit, is necessarily accounted for the main power circuit and auxiliary switching circuit output
Sky makes output DC voltage V than the driving pulse with phase0Stablize, also make AC input current waveform close to sine wave.Together
When, the driving pulse exported to the auxiliary circuit is ahead of certain to the driving pulse of totem PFC main circuits output
Time, thus make the auxiliary switch S of auxiliary switching circuitrIt is first open-minded, resonant capacitance C on auxiliary circuitsaWith resonant inductance Lr
Resonance is carried out, resonant capacitance C is recycledsaBy totem PFC power semiconductor switch S2Voltage clamping is between source electrode and drain electrode
0, totem PFC power semiconductor switch S is now given again1Come open-minded with driving pulse, be achieved that main switch S1No-voltage open
It is logical.Totem PFC Sofe Switch is so achieved that, the problem of hard switching is lost is improved, higher efficiency is realized.
As shown in figures 4 and 5, further specific implementation process is：Single phase ac input voltage is through totem PFC
Main power circuit boost inductance L1, power semiconductor switch S1, power semiconductor switch S2, power semiconductor switch Q1, work(
Rate semiconductor switch Q2Rectifier boost is exported, detection signal, input electricity of the control circuit according to output DC voltage detection circuit
The detection signal of current detection circuit determines to make totem PFC be output as required voltage V0Dutycycle, and export duty ratio corresponding
Drive pulse signal to totem PFC.The detection signal of input voltage zero-crossing detection circuit is input to the control circuit,
When detect input L positive N it is negative when, the drive pulse signal of the corresponding dutycycle of control circuit control output to totem PFC power
Semiconductor switch S1, while controlling circuit control to be output to totem PFC power semiconductor switch S2Drive pulse signal therewith
Complementation, and retain certain dead time；N timings, the drive of control circuit control output duty ratio corresponding are born when detecting input L
Moving pulse signal is to totem PFC power semiconductor switch S2, while controlling circuit control output to totem PFC power partly to lead
Body switchs S1Drive pulse signal it is complementary therewith, and retain certain dead time.When detect input L positive N it is negative when, control
Circuit control is exported to auxiliary switching circuit power semiconductor switch SrDrive pulse signal to be ahead of totem PFC power
Semiconductor switch S1On drive pulse signal, i.e. power semiconductor switch SrPower semiconductor switch S when opening1It is off
State, now inductance L1Electric current iLrPersistently rise to equal to output current ii, due to resonant inductance LrPresence, inductive current iLr
It may proceed to rise, now resonant inductance LrWith resonant capacitance CsaPass through fast recovery diode Dr1With power semiconductor switch SrFormed
Unidirectional circuit, produces resonance, inductive current iLrTo resonant capacitance CsaCharging, makes resonant capacitance CsaIt is zero to be discharged to voltage, so that
By power semiconductor switch S1Voltage clamping now controls circuit control output driving pulse again to zero volt between drain electrode and source electrode
Signal is to totem PFC power semiconductor switch S1, realize S1No-voltage it is open-minded.The SrThe advanced time of drive signal
tdIt should be greater than being equal to inductive current iLrPersistently rise to equal to electric current iiTime t01With resonant capacitance CsaIt is zero to be discharged to voltage
Time t02Sum, i.e. td≥t01+t12, wherein,
N timings, totem PFC power semiconductor switch S are born when detecting input L1Play synchronous rectification, control electricity
Lu Buxiang auxiliary switching circuit output pulse signals, auxiliary circuit power switch pipe disconnects in half of power frequency period herein, now
Totem PFC is in hard switching state.Therefore, the present invention realizes the resonance soft of PFC in half of power frequency period
Switch.This improves the shortcoming of traditional totem PFC hard switchings, totem PFC power is realized with resonance principle and is partly led
Body switchs S1No-voltage it is open-minded, reduce loss.
It is of the invention to be compared with common totem PFC, the auxiliary circuit of resonant type soft-switch is realized by adding, effectively
Solve the problems, such as loss and asking for Sofe Switch can not be realized in half of power frequency period that totem PFC down tube hard switchings cause
Topic, makes totem PFC down tube no-voltages open-minded, reduces turn-on consumption, and complete machine effect is improved on the basis of PFC performances are ensured
Rate.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention's
Protection domain.
Claims (7)
1. a kind of totem circuit of power factor correction of half power frequency period resonant type soft-switch structure, it is characterised in that the work(
Rate factor correcting circuit includes：The main power circuit of totem topology, the auxiliary that resonant type soft-switch is realized to the totem PFC
On-off circuit, input voltage zero-crossing detection circuit, input electric cur- rent measure circuit, output voltage detecting circuit and according to institute
The signal of voltage over zero detection circuit, input electric cur- rent measure circuit and output voltage detecting circuit is stated to control the main power
The control circuit of circuit and the auxiliary switching circuit；The control circuit is according to the output voltage detecting circuit, input electricity
The detection signal of current detection circuit and input voltage zero-crossing detection circuit carrys out output driving pulse, to control the auxiliary switch
Circuit and the totem circuit of power factor correction realize resonance, make the power switch pipe of the totem PFC in half of work
Realize that no-voltage is open-minded in the frequency cycle, so as to reduce the switching loss of main circuit, improve overall efficiency.
2. circuit of power factor correction according to claim 1, it is characterised in that：The main power electricity of the totem topology
Road includes power semiconductor switch S1, power semiconductor switch S2, power semiconductor switch Q1, power semiconductor switch Q2, boosting
Inductance L1；The boost inductance L1One end connects S1Drain electrode and S2Source electrode, the other end connect input single-phase alternating current live wire
L ends, the S1Source electrode connect DC output end negative pole, the S2Drain electrode connection DC output end positive pole, the Q1's
Negative pole and the Q2Positive pole connect the zero line N-terminal of input single-phase alternating current, the Q jointly1Positive pole connect the negative of DC output end
Pole, the Q2Negative pole connect the positive pole of VD, the S in succession1、S2Gate pole connection from the control circuit
Driving pulse.
3. circuit of power factor correction according to claim 2, it is characterised in that：The auxiliary switching circuit includes power
Semiconductor switch Sr, resonant capacitance Csa, resonant inductance Lr, fast recovery diode Dr1And Dr2；The SrSource electrode and direct current output
Hold negative pole connection, resonant inductance LrConnect the SrDrain electrode and the Dr1Negative pole, the Dr2Positive pole connect the Sr's
Drain electrode, Dr3Negative pole connect DC output end positive pole, the Dr1Positive pole connect the power semiconductor switch S1Drain electrode
With the power semiconductor switch S2Source electrode, the resonant capacitance CsaConnect DC output end negative pole and the power semiconductor
Switch S1Drain electrode, the SrGate pole connection from control circuit driving pulse.
4. the circuit of power factor correction according to claim any one of 1-3, it is characterised in that：The control circuit and institute
Main power circuit, the auxiliary circuit are stated by the way of isolation drive.
5. the circuit of power factor correction according to claim any one of 1-3, it is characterised in that：It is described to control the circuit to be
DSP。
6. the circuit of power factor correction according to claim any one of 1-3, it is characterised in that：Described control circuit root
According to the output voltage detecting circuit, the input electric cur- rent measure circuit, the input voltage zero-crossing detection circuit detection
Signal determines the dutycycle and phase of each driving pulse and produces driving pulse, makes the main electricity of totem PFC
Road, the switch of the auxiliary circuit work by fixed frequency.
7. the circuit of power factor correction according to claim any one of 1-3, it is characterised in that：It is described to control circuit to institute
The drive pulse signal for stating auxiliary switching circuit output is ahead of the drive pulse signal exported to the main power circuit, in advance
Time be td, and td≥t01+t12, wherein, t01It is resonant inductance electric current iLrStart to rise to inductive current i from above freezingL1When
Between, i.e.,V0For output end DC voltage value, LrFor resonant inductance value；t12It is resonant switch SrAfter opening, electric capacity
CsaResonant discharge, until electric capacity CsaThe time that voltage is zero,CsaFor resonant capacitance value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710173327.2A CN107070195A (en) | 2017-03-22 | 2017-03-22 | The totem circuit of power factor correction of half power frequency period resonant type soft-switch structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710173327.2A CN107070195A (en) | 2017-03-22 | 2017-03-22 | The totem circuit of power factor correction of half power frequency period resonant type soft-switch structure |
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| CN201710173327.2A Pending CN107070195A (en) | 2017-03-22 | 2017-03-22 | The totem circuit of power factor correction of half power frequency period resonant type soft-switch structure |
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Cited By (10)
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| CN108696116A (en) * | 2018-06-01 | 2018-10-23 | 广东美的制冷设备有限公司 | Totem pfc circuit, pulse width control method, air conditioner and storage medium |
| CN109617387A (en) * | 2018-12-10 | 2019-04-12 | 福州大学 | The voltage over zero current distortion control method and control device of totem PFC |
| CN109713676A (en) * | 2019-01-23 | 2019-05-03 | 深圳市高斯宝电气技术有限公司 | A kind of control method of crisscross parallel Bridgeless power factor circuit correcting circuit |
| CN110365233A (en) * | 2018-04-10 | 2019-10-22 | 半导体组件工业公司 | Method, encapsulation IC and the system of non-bridge PFC converter |
| CN110365202A (en) * | 2018-04-10 | 2019-10-22 | 半导体组件工业公司 | Non-bridge PFC converter and its control method and packaged type IC device |
| CN112398330A (en) * | 2020-12-25 | 2021-02-23 | 重庆宏一电气有限公司 | Bridgeless PFC converter and control method thereof |
| US11251698B2 (en) | 2020-07-17 | 2022-02-15 | Delta Electronics (Shanghai) Co., Ltd. | Power factor correction circuit |
| CN114257078A (en) * | 2021-12-13 | 2022-03-29 | 上海交通大学 | Totem-pole PFC inductive current synthesis circuit and equipment |
| US11462994B2 (en) | 2020-07-17 | 2022-10-04 | Delta Electronics (Shanghai) Co., Ltd. | Control method for power factor correction circuit |
| US11601036B2 (en) | 2021-04-16 | 2023-03-07 | Delta Electronics, Inc. | AC-DC power conversion system with zero voltage switching |
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| CN109617387A (en) * | 2018-12-10 | 2019-04-12 | 福州大学 | The voltage over zero current distortion control method and control device of totem PFC |
| CN109713676A (en) * | 2019-01-23 | 2019-05-03 | 深圳市高斯宝电气技术有限公司 | A kind of control method of crisscross parallel Bridgeless power factor circuit correcting circuit |
| US11251698B2 (en) | 2020-07-17 | 2022-02-15 | Delta Electronics (Shanghai) Co., Ltd. | Power factor correction circuit |
| US11462994B2 (en) | 2020-07-17 | 2022-10-04 | Delta Electronics (Shanghai) Co., Ltd. | Control method for power factor correction circuit |
| CN112398330A (en) * | 2020-12-25 | 2021-02-23 | 重庆宏一电气有限公司 | Bridgeless PFC converter and control method thereof |
| CN112398330B (en) * | 2020-12-25 | 2021-10-15 | 重庆宏一电气有限公司 | Bridgeless PFC converter and control method thereof |
| US11601036B2 (en) | 2021-04-16 | 2023-03-07 | Delta Electronics, Inc. | AC-DC power conversion system with zero voltage switching |
| CN114257078A (en) * | 2021-12-13 | 2022-03-29 | 上海交通大学 | Totem-pole PFC inductive current synthesis circuit and equipment |
| CN114257078B (en) * | 2021-12-13 | 2024-01-23 | 上海交通大学 | Totem pole PFC inductance current synthesis circuit and equipment |
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Application publication date: 20170818 |