CN102130577A - Window control circuit for power factor correction circuit - Google Patents
Window control circuit for power factor correction circuit Download PDFInfo
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- CN102130577A CN102130577A CN2010106155421A CN201010615542A CN102130577A CN 102130577 A CN102130577 A CN 102130577A CN 2010106155421 A CN2010106155421 A CN 2010106155421A CN 201010615542 A CN201010615542 A CN 201010615542A CN 102130577 A CN102130577 A CN 102130577A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a window control circuit for a power factor correction circuit, which comprises a sinusoidal half-wave voltage sampling circuit, a low-pass filter circuit and a comparison circuit, wherein the output end of the sinusoidal half-wave voltage sampling circuit is connected with the low-pass filter circuit; and the output end of the half-wave voltage sampling circuit and the output end of the low-pass filter circuit are connected with two input ends of the comparison circuit, and different connection ways can be adopted according to whether oscillating capacitance or oscillating resistance is used for deciding switching frequency of a PFC (power factor correction) controller. By adopting the window control circuit, the higher switching frequency is adopted in a region with smaller loss of the power factor correction circuit, that is the regions on two sides of voltage half-waves of an input power grid, the zero-crossing distortion of current of the input power grid can be prevented, and a higher power factor can be ensured; and the lower switching frequency is adopted in the main loss generation region, that is the middle region of the voltage half-waves of the input power grid, thereby reducing switching loss and improving the efficiency of the circuit.
Description
Technical field
The present invention relates to power factor correction (Power Factor Correction is hereinafter to be referred as PFC) circuit, be specifically related to a kind of window control circuit that is used for circuit of power factor correction.
Background technology
Because the extensive use of power electronic equipment, the harmonic pollution phenomenon is serious day by day.Many international standards such as IEC61000-3-2, IEEE519-992 have proposed power electronic equipment is injected the restriction of mains by harmonics, therefore are necessary to add the power factor correction link in the Switching Power Supply prime.Because continuous input current is easy to control, and electromagnetic interface filter is required characteristics such as low, the continuous Boost PFC of electric current has obtained using widely, but with higher switching frequency work, switching loss is bigger all the time for this circuit, exists efficient problem on the low side when underloading or low input.
Summary of the invention
Thereby the purpose of this invention is to provide a kind of switching frequency that reduces in can be between selected window region and reduce the especially window control circuit that is used for circuit of power factor correction of efficient when underloading or low input of circuit of power factor correction switching loss, raising circuit efficiency.
For achieving the above object, the technical solution used in the present invention is: first kind of window control circuit that is used for circuit of power factor correction comprises half-sinusoid voltage sampling circuit, low-pass filter circuit and comparison circuit, and the input of described low-pass filter circuit is connected with the same output of half-sinusoid voltage sampling circuit or is connected with the different outputs of half-sinusoid voltage sampling circuit respectively with the first input end of comparison circuit; The output of described low-pass filter circuit is connected with second input of described comparison circuit, makes that comparison circuit is output as high level when the input voltage of the first input end of comparison circuit during greater than the input voltage of second input of comparison circuit; When the input voltage of the first input end of comparison circuit during less than the input voltage of second input of comparison circuit, comparison circuit is output as low level.
Further, the present invention also comprises semiconductor switch pipe and oscillating capacitance, an end ground connection of described semiconductor switch pipe, and the described oscillating capacitance of another termination, the control end of described semiconductor switch pipe is connected with the output of described comparison circuit.
The window control circuit that another kind of the present invention is used for circuit of power factor correction comprises half-sinusoid voltage sampling circuit, low-pass filter circuit and comparison circuit, and second input of the input of described low-pass filter circuit and comparison circuit is connected with the same output of half-sinusoid voltage sampling circuit or is connected with the different outputs of half-sinusoid voltage sampling circuit respectively; The output of described low-pass filter circuit is connected with the first input end of described comparison circuit, makes that comparison circuit is output as high level when the input voltage of the first input end of comparison circuit during greater than the input voltage of second input of comparison circuit; When the input voltage of the first input end of comparison circuit during less than the input voltage of second input of comparison circuit, comparison circuit is output as low level.
Further, the present invention also comprises semiconductor switch pipe and oscillation resistance, an end ground connection of described semiconductor switch pipe, and the described oscillation resistance of another termination, the control end of described semiconductor switch pipe is connected with the output of described comparison circuit.
Compared with prior art, the invention has the beneficial effects as follows: because half-sinusoid voltage and the flip-flop of this voltage after low-pass filtering that window control circuit of the present invention adopts sampling to obtain relatively obtain window control signal, and with the value of the external oscillating element of this signal change pfc controller, can in the AC-input voltage half-wave, realize the switching of switching frequency, and the width of window control signal can keep constant under different AC-input voltage.Adopt the circuit of power factor correction of window control circuit of the present invention, the two side areas of promptly importing the line voltage half-wave than the zonule in loss adopts higher switching frequency, prevents to import the zero crossing distortion of power network current, guarantees high power factor; Produce the zone line of promptly importing the line voltage half-wave in the zone in main loss and adopt than low switching frequency, improve especially efficient when underloading or low input of circuit efficiency, efficient and power factor have been done good compromise to reduce switching loss.
Description of drawings
Fig. 1 is the existing continuous Boost PFC of electric current work wave schematic diagram;
Fig. 2 is a PFC input power waveform schematic diagram;
Fig. 3 is the circuit of power factor correction work wave schematic diagram that adopts window control circuit of the present invention;
Fig. 4 is a kind of window control circuit schematic diagram of the present invention;
Fig. 5 is the functional block diagram that adopts the circuit of power factor correction of window control circuit of the present invention;
Fig. 6 is the structural representation of first instantiation that adopts the circuit of power factor correction of window control circuit of the present invention;
Fig. 7 is the structural representation of second instantiation that adopts the circuit of power factor correction of window control circuit of the present invention;
Fig. 8 is the structural representation of the 3rd instantiation that adopts the circuit of power factor correction of window control circuit of the present invention;
Fig. 9 is an another kind of window control circuit schematic diagram of the present invention;
Figure 10 is the structural representation that adopts the 3rd instantiation of circuit of power factor correction of window control circuit of the present invention;
Figure 11 adopts the circuit of power factor correction of window control circuit of the present invention and the efficient comparative graph of the continuous Boost PFC of existing electric current.
Embodiment
Below in conjunction with the present invention that is elaborated of example and accompanying drawing.
Fig. 1 has provided the continuous Boost PFC of existing electric current drive signal waveform, input voltage waveform and input current waveform.As shown in Figure 1, in the continuous Boost PFC of conventional current, switching tube is all the time with higher switching frequency work, therefore the input current ripple is less, can obtain very high input power factor, but also caused higher switching loss, influenced the particularly further raising of efficient when underloading or low input of efficient.Because switching loss is directly proportional with switching frequency, can improve circuit efficiency by reducing switching frequency.But lower switching frequency can cause current ripples to become big and serious zero crossing distortion problem, influences the power factor of circuit, must consider switching frequency and power factor compromise, seeks the scheme of suitable reduction switching frequency.
In the continuous Boost PFC of conventional current, input power factor approaches 1, and input voltage and input current are the sine wave of homophase.As shown in Figure 2, the input instantaneous power is not invariable, but with two times of work frequency pulsation, wherein main power delivery areas appears at Fig. 2 shadow region, and most power transmits in Fig. 2 shadow region.Obvious most loss also is created in this zone, reduces this regional switching frequency and can effectively reduce switching loss.
According to above analysis, the invention provides a kind of windows controlling technique that is used for circuit of power factor correction, its principle as shown in Figure 3, T wherein
Line/ 2 is half electrical network cycle, and W is the width of window area.
From to PFC input power characteristic analysis as can be known, in the cycle, energy mainly transmits in the bigger zone of middle line voltage (Fig. 3 shadow region) at half electrical network.This interval MOSFET loss has also occupied the larger proportion of whole losses, therefore reduces switching frequency in this zone and can effectively reduce switching loss.Usually in order to prevent to form audio-frequency noise, low-limit frequency should not be lower than 20kHz here.And in the two side portions of electrical network half-wave, transmitted power is less, the MOSFET loss is less, and this moment, lower switching frequency was difficult to well follow the tracks of sinusoidal reference signal, form the zero crossing distortion easily, reduce power factor, therefore used higher switching frequency to obtain higher power factor in this zone.By the current waveform among Fig. 3 as can be seen, owing to used lower switching frequency at the window place and used smaller inductance value, therefore bigger at window place current ripples, make that the power factor of window control PFC is more lower slightly than traditional PFC, but it still can satisfy in the international standard to power factor and to the requirement of harmonic content through experimental verification, also can obtain different power factors to satisfy the requirement of various criterion by regulating window width.
In order to realize windows controlling technique of the present invention, need in input line voltage half-wave, realize the switching of switching frequency.Pfc controller commonly used utilizes external oscillating element such as oscillating capacitance or oscillation resistance to determine switching frequency usually, only need utilize size that a window control signal switches external oscillating element both can realize switching to switching frequency, because the change range of input voltage of PFC is wider, it is constant that the width of this window control signal must be able to keep under different input voltages.Window control circuit of the present invention is promptly in order to produce window control signal to realize window control PFC.
Fig. 4 has provided a kind of window control circuit of the present invention.This window control circuit comprises half-sinusoid voltage sampling circuit, low-pass filter circuit and comparison circuit.At first utilize half-wave sample circuit sampling input voltage half-sinusoid, the half-wave sample circuit has multiple implementation, for example directly utilize the divider resistance half-sinusoid voltage dividing potential drop that rectification obtains to rectifier bridge, perhaps additional rectification circuit to the AC-input voltage rectification after again through the divider resistance dividing potential drop, perhaps utilize voltage sensor sampling input voltage to obtain the input voltage half-sinusoid through rectification again.The output of half-wave voltage sample circuit is connected with the input of low-pass filter circuit, low-pass filter circuit is mainly used in the input voltage half-sinusoid filtering that sampling is obtained and obtains its DC component, low pass filter or the integrated low pass filter of this low-pass filter circuit for being made of discrete component is as simple R C low pass filter or active low-pass filter.This output of half-wave voltage sample circuit is connected with the first input end of comparison circuit simultaneously, the output of low-pass filter circuit is connected with second input of comparison circuit, make that comparison circuit is output as high level when the input voltage of the first input end of comparison circuit during greater than the input voltage of second input of comparison circuit; When the input voltage of the first input end of comparison circuit during less than the input voltage of second input of comparison circuit, comparison circuit is output as low level.Comparison circuit has more implementation, comparatively simple a kind of voltage comparator circuit as a comparison that is to use.The working voltage comparator is as a comparison during circuit, the first input end of the corresponding above-mentioned comparison circuit of the in-phase end of voltage comparator, second input of the corresponding above-mentioned comparison circuit of the end of oppisite phase of voltage comparator.Also can adopt other circuit to realize above-mentioned comparison circuit, but should be able to realize following logic: when the input voltage of the first input end of comparison circuit during greater than the input voltage of second input of comparison circuit, comparison circuit is output as high level; When the input voltage of the first input end of comparison circuit during less than the input voltage of second input of comparison circuit, comparison circuit is output as low level.
As shown in Figure 4, further, in order to utilize the switching frequency of comparator output signal switching pfc controller in the window control circuit, this window control circuit also can comprise semiconductor switch pipe and oscillating capacitance, one end ground connection of semiconductor switch pipe, another termination oscillating capacitance, the control end of semiconductor switch pipe is connected with the output of comparison circuit, and the original oscillating capacitance of the other end of oscillating capacitance and pfc controller is connected on the pfc controller jointly.Thereby the switch by comparator output signal control semiconductor switch pipe in the window control circuit changes the value of the external oscillating capacitance of pfc controller and then changes the pfc controller switching frequency.This semiconductor switch pipe can be selected common MOSFET for use, NPN triode etc.
Fig. 5 has provided the functional block diagram of the circuit of power factor correction that adopts window control circuit of the present invention, it comprises filter circuit, rectification circuit, switch converter of high power factor, electrochemical capacitor, pfc controller and the external oscillating element thereof that connects successively, and this circuit of power factor correction also comprises the window control circuit.The output of window control circuit and external oscillating element are connected the input of pfc controller jointly, the input of the output termination switch converter of high power factor of pfc controller.
Above-mentioned switch converter of high power factor is for realizing the various circuit topologies of power factor emendation function, as Boost converter commonly used, Buck converter etc.External oscillating element is generally oscillating capacitance or oscillation resistance for the peripheral cell of decision pfc controller switching frequency.For oscillating capacitance or oscillation resistance, need to adopt different window control circuits to realize windows controlling technique.
Fig. 6 has provided an instantiation of the circuit of power factor correction that adopts window control circuit of the present invention.This example comprises Boost converter part, pfc controller and external oscillating capacitance and window control circuit part.The rectification circuit BD that Boost converter part is made of four diodes
1Inductance L, diode D and main switch S form, one end of inductance L links to each other with the output terminals A of rectification circuit, the other end links to each other with the anode of diode D, between another output B of the contact of inductance L and diode D and rectification circuit, insert main switch branch road S, between another output B of the negative electrode of diode D and rectification circuit, be connected to output capacitance C
OPfc controller 1 can be the UC3854 of TI company, and this controller is by external oscillating capacitance determine switch frequency.
Among Fig. 6, the window control circuit comprises half-sinusoid voltage sampling circuit, low pass filter and comparison circuit, and the half-sinusoid voltage sampling circuit is by divider resistance R
1, R
2Form divider resistance R
1An end be connected the other end and R with the output terminals A of rectification circuit
2Connect R
2Other end ground connection, comparison circuit is made up of voltage comparator.AC-input voltage V after the rectifier bridge rectification
dBy divider resistance R
1, R
2Dividing potential drop, divider resistance R
1, R
2Common connection end connect the in-phase end of comparator 3, connect the input of low pass filter 2 simultaneously, low pass filter output V
FfSend into the end of oppisite phase of comparator 3, the output V of comparator 3
EWCAs switching tube S
1 Drive signal.As comparator 3 output V
EWCDuring for high level, MOSFET S
1Open-minded, the first oscillating capacitance CT
1With the second oscillating capacitance CT
2Access oscillating circuit in parallel determines the switching frequency of pfc controller 1 jointly, and this moment, switching frequency was lower; As comparator 3 output V
EWCDuring for low level, MOSFET S
1Turn-off, the first oscillating capacitance CT is only arranged
1Insert oscillating circuit and determine the switching frequency of pfc controller 1, this moment, switching frequency was higher.
Fig. 7 has provided another instantiation of window control circuit.The difference of Fig. 7 and Fig. 6 is that the half-sinusoid voltage sampling circuit is by rectifier diode D among Fig. 7
1, D
2With divider resistance R
1, R
2Form rectifier diode D
1And D
2Anode link to each other with the two ends of alternating current input power supplying respectively and input voltage carried out rectification, rectifier diode D
1And D
2The common and divider resistance R of negative electrode
1One end connects, divider resistance R
1The other end and divider resistance R
2Connect divider resistance R
2Other end ground connection, divider resistance R
1, R
2Common connection end connect the in-phase end of comparator 3, connect the input of low pass filter 2 simultaneously.
Fig. 8 has provided another instantiation of window control circuit.The difference of Fig. 8 and Fig. 6 is that the half-sinusoid voltage sampling circuit is by divider resistance R among Fig. 8
1, R
2And divider resistance R
3, R
4Form.Divider resistance R
1An end be connected the other end and divider resistance R with the output terminals A of rectification circuit
2Connect divider resistance R
2Other end ground connection, divider resistance R
1, R
2Common connection end connect the in-phase end of comparator 3; Divider resistance R
3An end be connected the other end and divider resistance R with the output terminals A of rectification circuit
4Connect divider resistance R
4Other end ground connection, divider resistance R
3, R
4Common connection end connect the input of low pass filter.
Fig. 9 has provided another kind of window control circuit of the present invention.This window control circuit comprises half-wave voltage sample circuit, low-pass filter circuit and comparison circuit, and the output of described half-wave voltage sample circuit is connected with the input of low-pass filter circuit; And this output of half-wave voltage sample circuit is connected with second input of comparison circuit, the output of described low-pass filter circuit is connected with the first input end of described comparison circuit, make that comparison circuit is output as high level when the input voltage of the first input end of comparison circuit during greater than the input voltage of second input of comparison circuit; When the input voltage of the first input end of comparison circuit during less than the input voltage of second input of comparison circuit, comparison circuit is output as low level.
As shown in Figure 9, further, in order to utilize the switching frequency of comparator output signal switching pfc controller in the window control circuit, this window control circuit also can comprise semiconductor switch pipe and oscillation resistance, one end ground connection of semiconductor switch pipe, another termination oscillation resistance, the control end of semiconductor switch pipe is connected with the output of comparison circuit, and the original oscillation resistance of the other end of oscillation resistance and pfc controller is connected on the pfc controller jointly.Thereby the switch by comparator output signal control semiconductor switch pipe in the window control circuit changes the value of the external oscillation resistance of pfc controller and then changes the pfc controller switching frequency.This semiconductor switch pipe can be selected common MOSFET for use, NPN triode etc.
Figure 10 has provided an instantiation of the circuit of power factor correction of the window control circuit that adopts Fig. 9.This example comprises Boost converter part, pfc controller and external oscillation resistance and window control circuit part.The rectification circuit BD that Boost converter part is made of four diodes
1Inductance L, diode D and main switch S form, one end of inductance L links to each other with the output terminals A of rectification circuit, the other end links to each other with the anode of diode D, between another output B of the contact of inductance L and diode D and rectification circuit, insert main switch branch road S, between another output B of the negative electrode of diode D and rectification circuit, be connected to output capacitance C
OPfc controller 4 is the ICE2PCS01 of Infineon company, and this controller is by external oscillation resistance determine switch frequency.
The window control circuit comprises half-sinusoid voltage sampling circuit, low pass filter and comparison circuit, and the half-sinusoid voltage sampling circuit is by divider resistance R
1, R
2Form divider resistance R
1An end be connected the other end and R with the output terminals A of rectification circuit
2Connect R
2Other end ground connection, comparison circuit is made up of voltage comparator.AC-input voltage V after the rectifier bridge rectification
dBy divider resistance R
1, R
2Dividing potential drop, divider resistance R
1, R
2Common connection end connect the end of oppisite phase of comparator 3, connect the input of low pass filter 2 simultaneously, low pass filter output V
FfSend into the in-phase end of comparator 3, the output V of comparator 3
EWCAs switching tube S
1 Drive signal.As comparator 3 output V
EWCDuring for high level, MOSFET S
1Open-minded, the first oscillation resistance RT
1With the second oscillation resistance RT
2Access oscillating circuit in parallel determines the switching frequency of pfc controller 4 jointly, and this moment, switching frequency was higher; As comparator 3 output V
EWCDuring for low level, MOSFET S
1Turn-off, the first oscillation resistance RT is only arranged
1Insert oscillating circuit and determine the switching frequency of pfc controller 4, this moment, switching frequency was lower.
Figure 11 has provided the circuit of power factor correction and the continuous Boost PFC of the existing electric current efficient comparative result of testing the employing window control circuit of the present invention that obtains.The input voltage of experimental prototype is 230Vac, the 50Hz AC-input voltage, and output voltage 400V direct current, rated output power are 500W, window width is 5ms.As shown in Figure 9, window control PFC can promote 0.6% efficient when underloading, also can promote 0.2% efficient at full load.This shows that windows controlling technique is in total power range, to the efficient effect that all has a certain upgrade, especially effective to the improvement of light-load efficiency, window control circuit of the present invention can effectively be realized windows controlling technique.
Window control circuit of the present invention on existing power factor correction integral control circuit basis, only need increase a little control circuit and can realize the window controlled function, and the width of this window control signal can keep constant under different input voltages.
Adopt the circuit of power factor correction of window control circuit of the present invention, suitably reduce switching frequency at selected window place to reduce switching loss, thereby under the situation that does not increase the inductance volume, improved the efficient of Boost pfc circuit, obtain the boost effect and the stable output voltage of needs simultaneously, and can satisfy requirement power factor.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, also can make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (4)
1. window control circuit that is used for circuit of power factor correction, it is characterized in that: comprise half-sinusoid voltage sampling circuit, low-pass filter circuit and comparison circuit, the input of described low-pass filter circuit is connected with the same output of half-sinusoid voltage sampling circuit or is connected with the different outputs of half-sinusoid voltage sampling circuit respectively with the first input end of comparison circuit; The output of described low-pass filter circuit is connected with second input of described comparison circuit, makes that comparison circuit is output as high level when the input voltage of the first input end of comparison circuit during greater than the input voltage of second input of comparison circuit; When the input voltage of the first input end of comparison circuit during less than the input voltage of second input of comparison circuit, comparison circuit is output as low level.
2. the window control circuit that is used for circuit of power factor correction according to claim 1, it is characterized in that: further comprising semiconductor switch pipe and oscillating capacitance, one end ground connection of described semiconductor switch pipe, the described oscillating capacitance of another termination, the control end of described semiconductor switch pipe is connected with the output of described comparison circuit.
3. window control circuit that is used for circuit of power factor correction, it is characterized in that: comprise half-sinusoid voltage sampling circuit, low-pass filter circuit and comparison circuit, second input of the input of described low-pass filter circuit and comparison circuit is connected with the same output of half-sinusoid voltage sampling circuit or is connected with the different outputs of half-sinusoid voltage sampling circuit respectively; The output of described low-pass filter circuit is connected with the first input end of described comparison circuit, makes that comparison circuit is output as high level when the input voltage of the first input end of comparison circuit during greater than the input voltage of second input of comparison circuit; When the input voltage of the first input end of comparison circuit during less than the input voltage of second input of comparison circuit, comparison circuit is output as low level.
4. the window control circuit that is used for circuit of power factor correction according to claim 3, it is characterized in that: further comprising semiconductor switch pipe and oscillation resistance, one end ground connection of described semiconductor switch pipe, the described oscillation resistance of another termination, the control end of described semiconductor switch pipe is connected with the output of described comparison circuit.
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|---|---|---|---|
| CN2010106155421A CN102130577B (en) | 2010-12-31 | 2010-12-31 | Window control circuit for power factor correction circuit |
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| CN102130577B CN102130577B (en) | 2013-09-04 |
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| WO2015196672A1 (en) * | 2014-06-26 | 2015-12-30 | 欧普照明股份有限公司 | Auxiliary power source circuit with power factor correction circuit, and control method and device therefor |
| US9564795B2 (en) | 2014-08-22 | 2017-02-07 | Silergy Semiconductor Technology (Hangzhou) Ltd | Ripple filter circuit and ripple filter method |
| US10038364B2 (en) | 2014-08-22 | 2018-07-31 | Silergy Semiconductor Technology (Hangzhou) Ltd | Ripple filter circuit and ripple filter method |
| CN107734782A (en) * | 2017-11-17 | 2018-02-23 | 上海阿卡得电子有限公司 | A kind of new power control output circuit |
| WO2019144962A1 (en) * | 2018-01-26 | 2019-08-01 | Industrial Connections & Solutions LLC | Frequency control circuits for use in power factor correction circuits |
| CN110086335A (en) * | 2018-01-26 | 2019-08-02 | 工业连结与解决方案有限责任公司 | For frequency control circuit used in circuit of power factor correction |
| CN110086335B (en) * | 2018-01-26 | 2024-03-22 | Abb瑞士股份有限公司 | Frequency control circuit for use in power factor correction circuit |
| WO2020237863A1 (en) * | 2019-05-31 | 2020-12-03 | 广东美的制冷设备有限公司 | Operation control method and apparatus, and circuit, household appliance and computer storage medium |
| CN111525787A (en) * | 2020-06-03 | 2020-08-11 | 珠海拓芯科技有限公司 | PFC control method and device, air conditioner and storage medium |
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