CN201839200U - Power factor correction circuit with variable duty cycle control - Google Patents

Power factor correction circuit with variable duty cycle control Download PDF

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Publication number
CN201839200U
CN201839200U CN2010205877411U CN201020587741U CN201839200U CN 201839200 U CN201839200 U CN 201839200U CN 2010205877411 U CN2010205877411 U CN 2010205877411U CN 201020587741 U CN201020587741 U CN 201020587741U CN 201839200 U CN201839200 U CN 201839200U
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China
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circuit
input
output
resistance
power factor
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Expired - Fee Related
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CN2010205877411U
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Chinese (zh)
Inventor
张波
张雪霁
眭永明
巢时斌
张桂东
肖文勋
丘东元
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South China University of Technology SCUT
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South China University of Technology SCUT
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation

Abstract

The utility model provides a power factor correction circuit with variable duty cycle control. A circuit topological structure of a Boost converter in the circuit and a control circuit realizing variable duty cycle array jointly form a PFC (power factor correction) stage of a common LED driving power supply, the front stage of the PFC stage is connected with the output end of an uncontrolled rectifying bridge of a single-phase diode by an input filter capacitor, and the rear stage of the PFC stage is connected with a DC/DC stage of the common LED driving power supply by an output filter inductor and an output filter capacitor. In the utility model, a switch tube is controlled to be connected or disconnected by utilizing the principle of equal impulse area, the impulse area of the input inductance current and that of the sine semiwave current are equal in each switching period so as to realize high power factor (PF), and the higher the switching frequency is, the closer PF value approaches 1. With the utility model, the high input power factor can be realized, output voltage ripple can be reduced, the control circuit is simple so as easily realize simulated circuit and be beneficial to large-scale integration.

Description

A kind of circuit of power factor correction of variable duty cycle control
Technical field
The utility model relates to the single phase power factor correcting circuit of field of switch power, particularly a kind of circuit of power factor correction of variable duty cycle control.
Background technology
During the operation of tradition AC-DC translation circuit, net side power factor generally all is about 0.6 ~ 0.7, and can produce a large amount of harmonic currents, and electrical network is caused serious harm.For satisfying High Power Factor, suppressing the requirement that harmonic wave produces, all will add usually has the PFC of power factor emendation function level.The PFC level is a DC/DC switch converters that is added between rectifier and the load, applied voltage current feedback technology, and the waveform that makes input current reaches the purpose that improves power factor near sinusoidal wave.According to the different requirements of different loads, need between PFC level and load, add the DC/DC level usually with the regulation voltage size to voltage swing.
DCM Boost pfc converter has the advantage that switching tube zero current turning-on and booster diode do not have reverse recovery, and switching frequency is constant.Inductive current changed with input voltage during but this converter switches pipe was opened, mean value is sinusoidal form, but switching tube blocking interval inductive current mean value is the non-sine form, thereby the inductive current mean value in a switch periods also is the non-sine form, its PF value is relatively low, especially when high pressure is imported.
Traditional control method is all being decided duty ratio control, and the control method commonly used that is applied to DCM Boost pfc converter is peak current control, because input current waveform is with U m/ U oIncrease and THD is increased, need add harmonic compensation at comparator input terminal.The control method of another novel injection triple-frequency harmonics because the triple-frequency harmonics content that is injected is relevant with input voltage, needs online adjusting to inject harmonic content, and implementation is too complicated.
Tradition realizes that the circuit of control strategy all is relatively to obtain with duty cycle signals and sawtooth signal, when duty ratio expression formula more complicated, then need complex calculation circuit or digital match to simplify and just can obtain, certainly will increase the loading level of analog circuit like this or reduce control precision.
The utility model content
The purpose of this utility model provides a kind of circuit of power factor correction of variable duty cycle control, adopt the momentum area to equate principle, acquisition can realize the variable duty cycle control sequence of High Power Factor, solve conventional P FC control method complexity, problem that precision is not high, when improving power factor, also obtained less output voltage ripple and higher efficient.The utility model is achieved through the following technical solutions:
A kind of circuit of power factor correction of variable duty cycle control, comprise the circuit topological structure of Boost booster converter and the control circuit of realization variable duty cycle sequence, realize that the control circuit of variable duty cycle sequence comprises input voltage detection circuit, output voltage detecting circuit, analog operational circuit and pulse regulation driver; The input voltage sample resistance of described input voltage detection circuit is connected input filter capacitor C InTwo ends, the input voltage sample resistance of input voltage detection circuit is first sampling point for first resistance and second resistance of series connection between described first resistance and second resistance, first sampling point is connected with an input of subtracter in the analog operational circuit; The output voltage sample resistance of described output voltage detecting circuit is connected between the negative electrode and ground of diode in the circuit topological structure of Boost booster converter, the output voltage sample resistance of output voltage detecting circuit is the 3rd resistance and the 4th resistance of series connection, be second sampling point between described the 3rd resistance and the 4th resistance, another input of subtracter and an input of divider are connected in second sampling point and the analog operational circuit; Described analog operational circuit comprises subtracter, divider, multiplier, sawtooth signal generator and comparator, and wherein, the output of subtracter is connected with another input of divider, and the output of divider is connected with an input of comparator; Sawtooth signal is connected with two inputs of multiplier that (the constant term K of multiplier is to calculate square value ), another input of the output termination comparator of multiplier, the output of comparator is connected with the input that pulse regulation drives.
The circuit topological structure of described Boost booster converter comprises inductance, switching tube and diode, one end of described inductance is connected with the positive output end that single-phase diode is not controlled rectifier bridge, the other end of inductance is connected with the drain electrode of switching tube, the source electrode of switching tube is connected with the negative output terminal that single-phase diode is not controlled rectifier bridge, and the gate pole of switching tube is connected with the pulse-width regulated output end of driver; Simultaneously, the other end of inductance is connected with diode anode, and the negative electrode of diode is connected with the DC/DC level through output inductor.
The control principle of the pfc circuit of above-mentioned high input power factor: the circuit topological structure that adopts the Boost booster converter, equate principle according to the momentum area, control the break-make of electronic power switch with the variable duty cycle control sequence, carry out the high frequency Active Power Factor Correction, the input inductance electric current is equated with the momentum area of half-sinusoid electric current in each switch periods, thereby realize the sineization of input current, make input power factor approach 1.
Described variable duty cycle control sequence equates that according to the momentum area principle draws, and specifically comprise: per half AC side input current cycle is divided into n minor time slice, and the width of each time period is a switch periods ,, make the integral area of inductive current waveform to each switch periods time period Equal the integral area of standard sine half-wave in this time period , promptly , wherein
(1)
(2)
Be inductive current peak, Be the conducting duty ratio of each switch periods under the inductive current discontinuous mode (DCM), Be inductive current duty ratio fall time in each switch periods under the discontinuous mode, Be the output voltage that single-phase diode is not controlled rectifier bridge (B), Be the output voltage of PFC level, Be the induction reactance value of the middle inductance (L) of circuit topological structure (1) of Boost booster converter, Be the input voltage peak value, Be the input voltage angular frequency, Be desirable input Sinusoidal Input Currents amplitude, Be the standard sine half-wave at the middle radian value of each switch periods time period, Be power output, equate by (1), (2) formula
(3)
(3) formula be exactly according to momentum equate that principle obtains about duty cycle sequence square expression formula.
Above-mentioned PFC control method can get according to (3) formula conversion
(4)
In each switch periods, to time t timing, (4) formula is set up up to a certain moment, at this moment be the moment of on-off switching tube.
Sawtooth signal in the described analog operational circuit is the clock signal of energy cycle zero clearing, and the slope of sawtooth waveforms is numerically equal to , the cycle is
The circuit topological structure of control circuit of the present utility model and Boost booster converter has constituted the PFC level of LED driving power commonly used jointly, and the prime of PFC level is through input filter capacitor C InThe output of not controlling rectifier bridge with single-phase diode is connected, and the back level of PFC level is connected with the DC/DC level of LED driving power commonly used with output filter capacitor through output inductor.
Compared with prior art the utlity model has following advantage: solved traditional DCM Boost pfc converter and existed current pulsation big, what power factor was low determines, can in whole input voltage range power factor is increased to and approach 1; Control circuit is realized easily, abandon original compare with the time sawtooth waveforms the method for duty ratio, open electric circuit or match that the involution of application time sawtooth signal replaces originally will using are simplified, make that control circuit is simpler, control strategy is more accurate, only realize, help integrated on a large scale with some basic analog operational circuits; Compare with deciding duty ratio control, can not only make input power factor, can also reduce output voltage ripple, make output voltage approach to stablize near 1.
This control circuit is applied to the PFC level of LED driving power, not only High Power Factor can be realized high efficiency illuminalive power-supply, and output voltage ripple reduce to reduce requirement to the output capacitance capacity, so just can with long ceramic electrical of life-span perhaps thin-film capacitor replace short big electrochemical capacitor of big life-span of volume, the life-span of improving the LED driving power on the whole.
Description of drawings
Fig. 1 is the led drive circuit of PFC level for the control of band variable duty cycle.
Input current waveform figure when Fig. 2 is the low pressure input.
Inductive current oscillogram when Fig. 3 is the low pressure input.
Input current waveform figure when Fig. 4 is the high pressure input.
Inductive current oscillogram when Fig. 5 is the high pressure input.
Power factor figure when Fig. 6 is the low pressure input.
Power factor figure when Fig. 7 is the high pressure input.
Output voltage waveform when Fig. 8 is the low pressure input.
Output voltage waveform when Fig. 9 is the high pressure input.
Output voltage stable state ripple enlarged drawing when Figure 10 is the low pressure input.
Output voltage stable state ripple enlarged drawing when Figure 11 is the high pressure input.
Embodiment
Below be in conjunction with the led drive circuit of PFC level,, the concrete enforcement of technical solutions of the utility model is described in further detail, but enforcement of the present utility model and protection range be not limited thereto as accompanying drawing 1 for band variable duty cycle control.
The basic structure of led drive circuit by the input power supply, do not control rectifier bridge, input filtering, PFC level, output filtering, DC/DC level, LED lamp load various piece and be connected in sequence.
Make input voltage be , the output voltage through not controlling rectifier bridge is so
In a switch periods, inductive current peak is:
(5)
Wherein Expression switch conduction duty ratio.
In each switch periods, equate by the weber number at inductance two ends:
(6)
Wherein The duty ratio of inductive current fall time in the expression switch periods.
Can get by (6):
(7)
According to (5) and (6) Shi Kede
(8)
Input current is so:
(9)
Will Standardization is got base value and is So,
(10)
As seen, the waveform of input current is only relevant with the no-load voltage ratio of Boost converter, More little, input current waveform is more near SIN function, and the PF value is high more.Otherwise the input voltage amplitude is more near output voltage amplitude, and the PF value is low more, and the amplitude that this has just limited input voltage is unfavorable for the power factor adjusting.
The circuit topological structure 1 of described Boost booster converter comprises inductance L, switching tube Q and diode D, one end of described inductance L is connected with the positive output end that single-phase diode is not controlled rectifier bridge B, the other end of inductance L is connected with the drain electrode of switching tube Q, the source electrode of switching tube Q is connected with the negative output terminal that single-phase diode is not controlled rectifier bridge B, and the gate pole of switching tube Q is connected with the output of pulse-width regulated driver 5; Simultaneously, the other end of inductance L is connected with diode D anode, and the negative electrode of diode D is through output inductor L oBe connected with the DC/DC level.
Therefore, the utility model proposes a kind of variable duty cycle control method based on the equal principle of momentum area, to realize the high input power factor in the wide input voltage range, specific implementation method is as follows:
Per half AC side input current cycle is divided into n minor time slice, and the width of each time period is a switch periods ,, make the integral area of inductive current waveform to each switch periods time period Equal the integral area of standard sine half-wave in this time period , promptly , wherein
(1)
(2)
Be inductive current peak, Be the conducting duty ratio of each switch periods under the inductive current discontinuous mode, Be inductive current duty ratio fall time in each switch periods under the discontinuous mode, Be the output voltage that single-phase diode is not controlled rectifier bridge B, Be the output voltage of PFC level, Be the induction reactance value of inductance L in the circuit topological structure 1 of Boost booster converter, Be the input voltage peak value, Be the input voltage angular frequency, Be desirable input Sinusoidal Input Currents amplitude, Be the standard sine half-wave at the middle radian value of each switch periods time period, Be power output, equate by (1), (2) formula
(3)
(3) formula be exactly according to momentum equate that principle obtains about duty cycle sequence square expression formula.
The control circuit of realizing the variable duty cycle sequence obtains according to (3) formula conversion, promptly
(4)
In each switch periods, to time t timing, (4) formula is set up up to a certain moment, at this moment be the moment of on-off switching tube.
Can obtain one about duty ratio by finding the solution Sequence, make input current waveform in each switch periods for sinusoidal wave, thereby realize PF=1.
By the momentum area equate (3) formula that principle calculates be exactly about duty cycle sequence square expression formula.Traditional control circuit realizes it being the duty cycle circuit of structure (3) expression formula, relatively get duty cycle signals with sawtooth waveforms again, like that can be because expression formula has radical to exist, and make control circuit very complicated, and, can reduce the accuracy of control like that if the cancellation radical just must come match to simplify by Taylor expansion.So the realization of control circuit is by obtaining (4) formula to (3) formula abbreviation in the utility model, utilize (4) formula two ends semaphore relatively obtained required control signal.
As Fig. 1, realize that the control circuit of variable duty cycle sequence comprises input voltage detection circuit 2, output voltage detecting circuit 3, analog operational circuit 4 and pulse regulation driver 5; The input voltage sample resistance of described input voltage detection circuit 2 is connected input filter capacitor C InTwo ends, the input voltage sample resistance of input voltage detection circuit 2 is first resistance R of series connection 1With second resistance R 2, described first resistance R 1With second resistance R 2Between be the first sampling point a, the first sampling point a is connected with an input of subtracter in the analog operational circuit 4; The output voltage sample resistance of described output voltage detecting circuit 3 is connected between the negative electrode and ground of diode D in the circuit topological structure 1 of Boost booster converter, and the output voltage sample resistance of output voltage detecting circuit 3 is the 3rd resistance R of series connection 3With the 4th resistance R 4, described the 3rd resistance R 3With the 4th resistance R 4Between be the second sampling point b, another input of subtracter and an input of divider are connected in the second sampling point b and the analog operational circuit 4; Described analog operational circuit 4 comprises subtracter, divider, multiplier, sawtooth signal generator and comparator, and wherein, the output of subtracter is connected with another input of divider, and the output of divider is connected with an input of comparator; The sawtooth signal generator is connected with two inputs of multiplier to calculate square value, and the constant term K of multiplier is Another input of the output termination comparator of multiplier, the output of comparator is connected with the input of pulse regulation driver 5.Sawtooth signal in the analog operational circuit 4 is the clock signal of energy cycle zero clearing, and the clock signal slope is numerically equal to , the cycle is , the signal expression that makes the sawtooth signal generator produce is , and each cycle zero clearing is once.
The circuit topological structure of above-mentioned control circuit and Boost booster converter has constituted the PFC level of LED driving power commonly used jointly, and the prime of PFC level is through input filter capacitor C InThe output of not controlling rectifier bridge with single-phase diode is connected, and the back level of PFC level is connected with the DC/DC level of LED driving power commonly used with output filter capacitor through output inductor.
This PFC level of variable duty cycle control that can realize is applied in the LED driving power, when the input low-voltage, input current waveform as shown in Figure 2, the current waveform on inductance after the rectification just can find out intuitively that the sineization effect is fine as shown in Figure 3 from waveform.When input during high voltage, input current waveform as shown in Figure 4, comparing with accompanying drawing 2 has a bit little distortion at the current over-zero place, the current waveform on inductance after the rectification as shown in Figure 5, the relative accompanying drawing 3 of its sineization effect has some distortions on sinusoidal wave peak value.From PF value figure low, when high pressure is imported, power factor is all more than 0.99, as accompanying drawing 6 and accompanying drawing 7.Output voltage waveforms when low pressure when input and high pressure input is shown in accompanying drawing 8 and accompanying drawing 9, the output voltage stabilization response speed is fast as can be seen, from output voltage steady-sxtate wave motion figure as can be seen the output ripple value less than 4.5V, and input voltage raises, the increase of output voltage ripple value is not remarkable, as accompanying drawing 10 and accompanying drawing 11.
Through above-mentioned analysis, equate that based on momentum the variable duty cycle control method of principle is applied to the PFC level of LED driving power with this, power factor height not only, and be applicable to wide input voltage, output voltage ripple is little, reduced requirement to the output capacitance capacity, can with long ceramic electrical of life-span perhaps thin-film capacitor replace short big electrochemical capacitor of big life-span of volume, the life-span of improving the LED driving power on the whole.

Claims (2)

1. the circuit of power factor correction of variable duty cycle control, the control circuit that it is characterized in that comprising the circuit topological structure of Boost booster converter and realize the variable duty cycle sequence realizes that the control circuit of variable duty cycle sequence comprises input voltage detection circuit (2), output voltage detecting circuit (3), analog operational circuit (4) and pulse regulation driver (5); The input voltage sample resistance of described input voltage detection circuit (2) is connected input filter capacitor C InTwo ends, the input voltage sample resistance of input voltage detection circuit (2) is the first resistance (R of series connection 1) and the second resistance (R 2), the described first resistance (R 1) and the second resistance (R 2) between be first sampling point (a), an input of subtracter is connected in first sampling point (a) and the analog operational circuit (4); The output voltage sample resistance of described output voltage detecting circuit (3) is connected between the negative electrode and ground of diode (D) in the circuit topological structure (1) of Boost booster converter, and the output voltage sample resistance of output voltage detecting circuit (3) is the 3rd resistance (R of series connection 3) and the 4th resistance (R 4), described the 3rd resistance (R 3) and the 4th resistance (R 4) between be second sampling point (b), another input of subtracter and an input of divider are connected in second sampling point (b) and the analog operational circuit (4); Described analog operational circuit (4) comprises subtracter, divider, multiplier, sawtooth signal generator and comparator, wherein, the output of subtracter is connected with another input of divider, and the output of divider is connected with an input of comparator; The sawtooth signal generator is connected with two inputs of multiplier; Another input of the output termination comparator of multiplier, the output of comparator is connected with the input of pulse regulation driver (5).
2. the circuit of power factor correction of a kind of variable duty cycle control according to claim 1, the circuit topological structure (1) that it is characterized in that described Boost booster converter comprises inductance (L), switching tube (Q) and diode (D), one end of described inductance (L) is connected with the positive output end that single-phase diode is not controlled rectifier bridge (B), the other end of inductance (L) is connected with the drain electrode of switching tube (Q), the source electrode of switching tube (Q) is connected with the negative output terminal that single-phase diode is not controlled rectifier bridge (B), and the gate pole of switching tube (Q) is connected with the output of pulse-width regulated driver (5); Simultaneously, the other end of inductance (L) is connected with diode (D) anode, and the negative electrode of diode (D) is through output inductor (L o) be connected with the DC/DC level.
CN2010205877411U 2010-11-02 2010-11-02 Power factor correction circuit with variable duty cycle control Expired - Fee Related CN201839200U (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102331562A (en) * 2011-08-31 2012-01-25 华南理工大学 Method for forecasting efficiency of electrochemical high-frequency switching power supply
CN102437727A (en) * 2011-12-26 2012-05-02 杭州矽力杰半导体技术有限公司 Boost power factor correction (PFC) controller
CN103731061A (en) * 2012-10-10 2014-04-16 江苏固德威电源科技有限公司 Both-way energy storing inverter topological structure
TWI449465B (en) * 2011-09-27 2014-08-11 Delta Electronics Inc Voltage-sensing dimming contorl system and method using the same
CN108075634A (en) * 2016-11-17 2018-05-25 台达电子电源(东莞)有限公司 For the control device and control method of power factor correcting converter
WO2018094898A1 (en) * 2016-11-25 2018-05-31 广东百事泰电子商务股份有限公司 Smart boost conversion device with long service life
CN108521214A (en) * 2018-04-13 2018-09-11 南京理工大学 A kind of boost power factor correcting converter and its correction transform method
CN108736714A (en) * 2018-06-11 2018-11-02 山东超越数控电子股份有限公司 A kind of auxiliary power supply circuit applied to low-voltage starting switch power supply
CN113315391A (en) * 2021-04-29 2021-08-27 武汉华海通用电气有限公司 Digital PFC circuit

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102331562A (en) * 2011-08-31 2012-01-25 华南理工大学 Method for forecasting efficiency of electrochemical high-frequency switching power supply
CN102331562B (en) * 2011-08-31 2013-07-24 华南理工大学 Method for forecasting efficiency of electrochemical high-frequency switching power supply
TWI449465B (en) * 2011-09-27 2014-08-11 Delta Electronics Inc Voltage-sensing dimming contorl system and method using the same
CN102437727A (en) * 2011-12-26 2012-05-02 杭州矽力杰半导体技术有限公司 Boost power factor correction (PFC) controller
CN103731061A (en) * 2012-10-10 2014-04-16 江苏固德威电源科技有限公司 Both-way energy storing inverter topological structure
CN108075634A (en) * 2016-11-17 2018-05-25 台达电子电源(东莞)有限公司 For the control device and control method of power factor correcting converter
CN108075634B (en) * 2016-11-17 2020-05-01 台达电子电源(东莞)有限公司 Control device and control method for power factor correction converter
WO2018094898A1 (en) * 2016-11-25 2018-05-31 广东百事泰电子商务股份有限公司 Smart boost conversion device with long service life
CN108521214A (en) * 2018-04-13 2018-09-11 南京理工大学 A kind of boost power factor correcting converter and its correction transform method
CN108736714A (en) * 2018-06-11 2018-11-02 山东超越数控电子股份有限公司 A kind of auxiliary power supply circuit applied to low-voltage starting switch power supply
CN113315391A (en) * 2021-04-29 2021-08-27 武汉华海通用电气有限公司 Digital PFC circuit

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