CN204119020U - A kind of PFC protective circuit and air conditioner - Google Patents
A kind of PFC protective circuit and air conditioner Download PDFInfo
- Publication number
- CN204119020U CN204119020U CN201420425992.8U CN201420425992U CN204119020U CN 204119020 U CN204119020 U CN 204119020U CN 201420425992 U CN201420425992 U CN 201420425992U CN 204119020 U CN204119020 U CN 204119020U
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- 230000001681 protective effect Effects 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 36
- 238000005070 sampling Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 230000001771 impaired effect Effects 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 206010037660 Pyrexia Diseases 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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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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Abstract
The utility model belongs to circuit of power factor correction technical field, provides a kind of PFC protective circuit and air conditioner.The utility model comprises the PFC protective circuit of over-current detection module and protecting control module by adopting, the voltage correspondingly output overcurrent detection signal produced according to sampling resistor two ends by over-current detection module, when the voltage at sampling resistor two ends increases because of the switching tube overcurrent in pfc circuit, according to the over-current detection signal that over-current detection module exports, time delay bypass process is carried out to the drive singal that main control chip exports PFC driving chip to, thus effectively can ensure when pfc circuit does not recover normal that PFC driving chip control switch pipe keeps turning off, to reach the object of protection switch pipe and pfc circuit.
Description
Technical field
The utility model belongs to circuit of power factor correction technical field, particularly relates to a kind of PFC protective circuit and air conditioner.
Background technology
At present, PFC (Power Factor Correction, power factor correction) circuit can be adopted in the power circuit of air-conditioner device.Pfc circuit can improve power supply to the utilance of civil power when being direct current by AC conversion, reduce the electric energy loss of conversion process, reach energy-conservation object.Pfc circuit can also reduce the impact of power supply on utility grid, the impact on other electrical equipment when avoiding it to start suddenly.
When operation irregularity appears in pfc circuit, the current foldback circuit that prior art adopts can turn off to reach the object protecting pfc circuit by the switching tube (as IGBT) controlled in time in pfc circuit.But; above-mentioned current foldback circuit closes at control switch pipe has no progeny; control switch pipe can be shifted to an earlier date when pfc circuit does not recover normal condition completely to open; so switching tube easily blasting property damage because of overcurrent under abnormality can be made, and then cause pfc circuit to be damaged and normal operating state cannot be recovered.
In sum, prior art exists because shifting to an earlier date control switch pipe to open when pfc circuit does not recover normal condition makes switching tube overcurrent damage, and the problem causing pfc circuit impaired further.
Utility model content
The purpose of this utility model is to provide a kind of PFC protective circuit, is intended to solve prior art and opens because shifting to an earlier date control switch pipe when pfc circuit does not recover normal condition, and make switching tube overcurrent damage, and the problem causing pfc circuit impaired further.
The utility model realizes like this, a kind of PFC protective circuit, be connected with pfc circuit, described pfc circuit comprises rectifier bridge, inductance, switching tube, diode and electrochemical capacitor, the AC incoming transport electricity of described rectifier bridge, described inductance is connected between the output of described rectifier bridge and the anode of described diode, the negative electrode of described diode is the output of described pfc circuit, between the negative electrode that described electrochemical capacitor is connected to described diode and ground, hot end and the cold end of described switching tube are connected anode and the ground of described diode respectively; Described PFC protective circuit comprises sampling resistor, PFC driving chip and main control chip, described sampling resistor is connected between the loop end of described rectifier bridge and the cold end of described switching tube, and described main control chip output drive signal makes described PFC driving chip carry out break-make control to described switching tube;
Described PFC protective circuit also comprises:
First input end and the second input are connected first end and second end of described sampling resistor respectively, the over-current detection module of the voltage produced according to described sampling resistor two ends correspondingly output overcurrent detection signal;
Input connects the output of described over-current detection module; first signal bypass end is connected described PFC driving chip and described main control chip respectively with secondary signal bypass end; when the voltage at described sampling resistor two ends increases because of described switching tube overcurrent, according to described over-current detection signal, the drive singal that shown main control chip exports described PFC driving chip to is carried out to the protecting control module of time delay bypass process.
Another object of the present utility model is also to provide a kind of air conditioner, and it comprises pfc circuit and above-mentioned PFC protective circuit.
The utility model comprises the PFC protective circuit of over-current detection module and protecting control module by adopting, the voltage correspondingly output overcurrent detection signal produced according to sampling resistor two ends by over-current detection module, when the voltage at sampling resistor two ends increases because of the switching tube overcurrent in pfc circuit, according to the over-current detection signal that over-current detection module exports, time delay bypass process is carried out to the drive singal that main control chip exports PFC driving chip to, thus effectively can ensure when pfc circuit does not recover normal that PFC driving chip control switch pipe keeps turning off, to reach the object of protection switch pipe and pfc circuit, solve prior art to open because shifting to an earlier date control switch pipe when pfc circuit does not recover normal condition, and make switching tube overcurrent damage, and the problem causing pfc circuit impaired further.
Accompanying drawing explanation
Fig. 1 is the structure chart of the PFC protective circuit that the utility model embodiment provides;
Fig. 2 is the exemplary circuit structure chart of the PFC protective circuit that the utility model embodiment provides;
Fig. 3 is the signal waveforms involved by PFC protective circuit shown in Fig. 2.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 1 shows the structure of the PFC protective circuit that the utility model embodiment provides, and for convenience of explanation, illustrate only the part relevant to the utility model embodiment, details are as follows:
PFC protective circuit 100 is connected with existing pfc circuit 200, and pfc circuit 200 comprises rectifier bridge BD, inductance L 1, switching tube S1, diode D
sand the AC incoming transport electricity AC of electrochemical capacitor E1, rectifier bridge BD, inductance L 1 is connected to output and the diode D of rectifier bridge BD
sanode between, diode D
snegative electrode be the output of pfc circuit 200, electrochemical capacitor E1 is connected to diode D
snegative electrode and ground between, the hot end of switching tube S1 is connected diode D respectively with cold end
sanode and ground.
Identical with existing PFC protective circuit, PFC protective circuit 100 also comprises sampling resistor R
s, PFC driving chip 101 and main control chip 102, sampling resistor is connected between the loop end of rectifier bridge BD and the cold end of switching tube S1, and main control chip 102 output drive signal makes PFC driving chip 101 switch tube S1 carry out break-make control.
In addition, in the utility model embodiment, PFC protective circuit 100 also comprises:
First input end is connected sampling resistor R respectively with the second input
sfirst end and the second end, according to sampling resistor R
sthe over-current detection module 103 of the voltage that two ends produce correspondingly output overcurrent detection signal;
Input connects the output of over-current detection module 103, and the first signal bypass end is connected PFC driving chip 101 and main control chip 102 with secondary signal bypass end, respectively as sampling resistor R
swhen the voltage at two ends increases because of switching tube S1 overcurrent, the over-current detection signal exported according to over-current detection module 103 carries out the protecting control module 104 of time delay bypass process to the drive singal that main control chip 102 exports PFC driving chip 101 to.
Wherein, above-mentioned as sampling resistor R
sin fact the process that the voltage at two ends increases because of switching tube S1 overcurrent is exactly when pfc circuit appearance makes switching tube S1 overcurrent extremely, sampling resistor R
sthe process that the voltage at two ends can increase thereupon.Switching tube S1 can be IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), metal-oxide-semiconductor or other possess the semiconductor device of switching characteristic.
Fig. 2 shows the exemplary circuit structure of the PFC protective circuit that the utility model embodiment provides, and for convenience of explanation, illustrate only the part relevant to the utility model embodiment, details are as follows:
Over-current detection module 103 comprises:
First resistance R1, the second resistance R2, the first electric capacity C1, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the first comparator U1;
The first end of the first resistance R1 and the first end of the second resistance R2 are respectively first input end and second input of over-current detection module 103, second end of the first resistance R1 and the first end of the first electric capacity C1 are connected to the first end of the 3rd resistance R3 altogether, second end of the second resistance R2 and second end of the first electric capacity C1 are connected to the first end of the 4th resistance R4 altogether, second end of the 3rd resistance R3 and the first end of the 5th resistance R5 are connected to the in-phase input end of the first comparator U1 altogether, second end of the 5th resistance R5 connects DC power supply VCC, second end of the 4th resistance R4 and the first end of the 6th resistance R6 are connected to the inverting input of the first comparator U1 altogether, second end of the 6th resistance R6 connects DC power supply VCC, positive power source terminal and the negative power end of the first comparator U1 are connected DC power supply VCC and ground respectively, the output of the first comparator U1 is the output of over-current detection module 103.
Protecting control module 104 comprises:
7th resistance R7, the 8th resistance R8, the second comparator U2, the first diode D1, the 9th resistance R9, the tenth resistance R10, the second electric capacity C2, the second diode D2 and the 3rd diode D3;
The first end of the 7th resistance R7 connects DC power supply VCC, second end of the 7th resistance R7 and the first end of the 8th resistance R8 are connected to the inverting input of the second comparator U2 altogether, second end of the 8th resistance R8 and the negative power end of the second comparator U2 are connected to ground altogether, the in-phase input end of the second comparator U2 and the anode of the first diode D1, the first end of the 9th resistance R9 and the first end of the second electric capacity C2 connect the input that formed common contact is protecting control module 104 altogether, the positive power source terminal of the second comparator U2 and the negative electrode of the first diode D1, second end of the 9th resistance R9 and the first end of the tenth resistance R10 are connected to DC power supply VCC altogether, second end of the tenth resistance R10 and second end of the second electric capacity C2, the negative electrode of the second diode D2 and the negative electrode of the 3rd diode D3 are connected to the output of the second comparator U2 altogether, the anode of the second diode D2 and the anode of the 3rd diode D3 are respectively the first signal bypass end and the secondary signal bypass end of protecting control module 104.
Below in conjunction with operation principle, above-mentioned PFC protective circuit is described further:
When pfc circuit occur abnormal and make switching tube S1 overcurrent (because of operating current exception or run into spike and overcurrent) time, flow through sampling resistor R
selectric current can increase (current waveform I as shown in Figure 3
rS), then sampling resistor R
sthe voltage at two ends also can increase thereupon, in over-current detection module 103, obtains sampling resistor R by the first resistance R1, the second resistance R2, the first electric capacity C1, the 3rd resistance R3, the 4th resistance R4
sthe voltage parameter at two ends, then now the first comparator U1 voltage parameter that can input according to its in-phase input end and inverting input correspondingly output low level (this low level is above-mentioned over-current detection signal, its waveform S as shown in Figure 3
u1) to the in-phase input end of the second comparator U2, second comparator U2 output low level thereupon, then the drive singal that main control chip 102 exports PFC driving chip 101 to is pulled to low level by the second diode D2 by the output of the second comparator U2, to carry out bypass process to drive singal, thus the direct control switch pipe S1 of PFC driving chip 101 is turned off.Due to the narrower (S as shown in Figure 3 of low level waveform that the first comparator U1 exports
u1), so occur abnormal and under also not recovering normal situation at pfc circuit, the above-mentioned time of carrying out bypass process to drive singal can be made to be shorter than pfc circuit returns to normal condition time from abnormality, thus cause PFC driving chip 101 can shift to an earlier date control switch pipe S1 conducting unlatching, and then cause switching tube S1 because there is overcurrent fever phenomenon under working in abnormality, easily cause switching tube S1 to occur explosive damage.For these reasons, in protecting control module 104, level delay circuit is formed by the 9th resistance R9, the tenth resistance R10 and the second electric capacity C2, the in-phase input end of the second comparator U2 receives low level while, DC power supply VCC to charge (the waveform U as shown in Figure 3 of its charging voltage to the second electric capacity C2 through the 9th resistance R9
c2), the voltage of the first end of the second electric capacity C2 slowly rises, then the voltage of the in-phase input end of the second comparator U2 also slowly rises, because the voltage of the in-phase input end of the second comparator U2 is lower than the voltage of its inverting input, so the output of the second comparator U2 continues output low level (its waveform SU2 as shown in Figure 3), thus time delay bypass process can be carried out to the drive singal that main control chip 102 exports PFC driving chip 101 to, extended further to make the turn-off time of switching tube S1, effectively can avoid the opening switch pipe S1 when pfc circuit does not recover normal, and then better protection switch pipe S1 from damage, avoid pfc circuit impaired further.When pfc circuit recovers normal, then through sampling resistor R
selectric current can reduce, sampling resistor R
sthe voltage at two ends also can correspondingly reduce; first comparator U1 also can export high level thereupon; second comparator U2 also correspondingly will export high level according to this high level; then the second diode D2 cannot conducting; so the drive singal that main control chip 102 can not be exported to PFC driving chip 101 is pulled to low level; then PFC driving chip 101 just controllable switch pipe S1 recovery conducting opening, a pfc circuit protection period also just leaves it at that.
From foregoing, the time (namely to the charging interval of the second electric capacity C2) of the second comparator U2 output low level depends on the resistance of the 9th resistance R9 and the tenth resistance R10 and the capacity of the second electric capacity C2, under normal conditions, require that the span of the time of the second comparator U2 output low level is for [1ms, 4ms], 3ms can be preferably in the utility model embodiment, the resistance of the 9th resistance R9 can be taken as 10K Ω, the resistance of the tenth resistance R10 can be taken as 4.7K Ω, and the capacity of the second electric capacity C2 can be taken as 0.03uF.
In addition, when the second comparator U2 output low level, the pin of main control chip 102 is also pulled to low level by the 3rd diode D3 by the output of the second comparator U2, main control chip 102 now can correspondingly stop to PFC driving chip 101 output drive signal, then the same uncontrollable switching tube S1 conducting of PFC driving chip 101 is opened, so time delay bypass process can be carried out to drive singal and combine with above-mentioned like this, switch tube S1 realizes dual turn-off protection, no matter the second diode D2 or the 3rd diode D3 because fault cannot conducting, the equal PFC driving chip 101 control switch pipe S1 that can make keeps when pfc circuit does not recover normal turning off, thus reach the object of protection switch pipe S1 and whole pfc circuit.
Based on the advantage of above-mentioned PFC protective circuit, the utility model embodiment still provides a kind of air conditioner, and it comprises pfc circuit and above-mentioned PFC protective circuit.
In sum, the utility model embodiment comprises the PFC protective circuit 100 of over-current detection module 103 and protecting control module 104 by adopting, by over-current detection module 103 according to sampling resistor R
sthe voltage that two ends produce is output overcurrent detection signal correspondingly, as sampling resistor R
swhen the voltage at two ends increases because of the switching tube S1 overcurrent in pfc circuit 200, according to the over-current detection signal that over-current detection module 103 exports, time delay bypass process is carried out to the drive singal that main control chip 102 exports PFC driving chip 101 to, thus effectively can ensure when pfc circuit 200 does not recover normal that PFC driving chip 101 control switch pipe S1 keeps turning off, to reach the object of protection switch pipe S1 and pfc circuit 200, solve prior art to open because shifting to an earlier date control switch pipe when pfc circuit does not recover normal condition, and make switching tube overcurrent damage, and the problem causing pfc circuit impaired further.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (5)
1. a PFC protective circuit, be connected with pfc circuit, described pfc circuit comprises rectifier bridge, inductance, switching tube, diode and electrochemical capacitor, the AC incoming transport electricity of described rectifier bridge, described inductance is connected between the output of described rectifier bridge and the anode of described diode, the negative electrode of described diode is the output of described pfc circuit, between the negative electrode that described electrochemical capacitor is connected to described diode and ground, hot end and the cold end of described switching tube are connected anode and the ground of described diode respectively; Described PFC protective circuit comprises sampling resistor, PFC driving chip and main control chip, described sampling resistor is connected between the loop end of described rectifier bridge and the cold end of described switching tube, and described main control chip output drive signal makes described PFC driving chip carry out break-make control to described switching tube; It is characterized in that, described PFC protective circuit also comprises:
First input end and the second input are connected first end and second end of described sampling resistor respectively, the over-current detection module of the voltage produced according to described sampling resistor two ends correspondingly output overcurrent detection signal;
Input connects the output of described over-current detection module; first signal bypass end is connected described PFC driving chip and described main control chip respectively with secondary signal bypass end; when the voltage at described sampling resistor two ends increases because of described switching tube overcurrent, according to described over-current detection signal, the drive singal that shown main control chip exports described PFC driving chip to is carried out to the protecting control module of time delay bypass process.
2. PFC protective circuit as claimed in claim 1, it is characterized in that, described over-current detection module comprises:
First resistance, the second resistance, the first electric capacity, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and the first comparator;
The first end of described first resistance and the first end of described second resistance are respectively first input end and second input of described over-current detection module, second end of described first resistance and the first end of described first electric capacity are connected to the first end of described 3rd resistance altogether, second end of described second resistance and the second end of described first electric capacity are connected to the first end of described 4th resistance altogether, second end of described 3rd resistance and the first end of described 5th resistance are connected to the in-phase input end of described first comparator altogether, second end of described 5th resistance connects DC power supply, second end of described 4th resistance and the first end of described 6th resistance are connected to the inverting input of described first comparator altogether, second end of described 6th resistance connects described DC power supply, positive power source terminal and the negative power end of described first comparator are connected described DC power supply and ground respectively, the output of described first comparator is the output of described over-current detection module.
3. PFC protective circuit as claimed in claim 1, it is characterized in that, described protecting control module comprises:
7th resistance, the 8th resistance, the second comparator, the first diode, the 9th resistance, the tenth resistance, the second electric capacity, the second diode and the 3rd diode;
The first end of described 7th resistance connects DC power supply, second end of described 7th resistance and the first end of described 8th resistance are connected to the inverting input of described second comparator altogether, second end of described 8th resistance and the negative power end of described second comparator are connected to ground altogether, the in-phase input end of described second comparator and the anode of described first diode, the first end of described 9th resistance and the first end of described second electric capacity connect the input that formed common contact is described protecting control module altogether, the positive power source terminal of described second comparator and the negative electrode of described first diode, second end of described 9th resistance and the first end of described tenth resistance are connected to DC power supply altogether, second end of described tenth resistance and the second end of described second electric capacity, the negative electrode of described second diode and the negative electrode of described 3rd diode are connected to the output of described second comparator altogether, the anode of described second diode and the anode of described 3rd diode are respectively the first signal bypass end and the secondary signal bypass end of described protecting control module.
4. PFC protective circuit as claimed in claim 3, it is characterized in that, the resistance of described 9th resistance is 10K Ω, and the resistance of described tenth resistance is 4.7K Ω, and the capacity of described second electric capacity is 0.03uF.
5. an air conditioner, comprises pfc circuit, it is characterized in that, described air conditioner also comprises the PFC protective circuit as described in any one of Claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420425992.8U CN204119020U (en) | 2014-07-30 | 2014-07-30 | A kind of PFC protective circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420425992.8U CN204119020U (en) | 2014-07-30 | 2014-07-30 | A kind of PFC protective circuit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204119020U true CN204119020U (en) | 2015-01-21 |
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ID=52336297
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420425992.8U Expired - Lifetime CN204119020U (en) | 2014-07-30 | 2014-07-30 | A kind of PFC protective circuit and air conditioner |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106603050A (en) * | 2016-12-15 | 2017-04-26 | 苏州捷芯威半导体有限公司 | Integrated semiconductor power switching device |
| CN108718152A (en) * | 2018-06-13 | 2018-10-30 | 广东美的制冷设备有限公司 | Interleaved PFC control circuit and motor-drive circuit |
| CN108731213A (en) * | 2018-08-16 | 2018-11-02 | 珠海恒途电子有限公司 | A kind of guard time adjusts circuit, PFC current foldback circuits and controller |
| CN108809197A (en) * | 2018-06-13 | 2018-11-13 | 广东美的制冷设备有限公司 | Interleaved PFC control circuit and motor-drive circuit |
| CN110233564A (en) * | 2019-07-05 | 2019-09-13 | 广东美的制冷设备有限公司 | Drive control circuit and household appliance |
| CN111244896A (en) * | 2018-11-28 | 2020-06-05 | 安徽美芝精密制造有限公司 | Motor demagnetization protection circuit, motor and compressor |
| CN111478286A (en) * | 2020-03-17 | 2020-07-31 | 海信（山东）空调有限公司 | PFC overcurrent protection circuit, air conditioner controller and air conditioner |
| CN113783413A (en) * | 2021-09-03 | 2021-12-10 | 株洲市众普森技术有限公司 | Method for changing PFC output voltage |
| CN114123754A (en) * | 2021-11-05 | 2022-03-01 | 海信（广东）空调有限公司 | Overcurrent protection circuit and method and air conditioner |
| CN114337239A (en) * | 2021-12-21 | 2022-04-12 | 海信（山东）空调有限公司 | PFC protection circuit, variable frequency controller and household appliance |
-
2014
- 2014-07-30 CN CN201420425992.8U patent/CN204119020U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106603050A (en) * | 2016-12-15 | 2017-04-26 | 苏州捷芯威半导体有限公司 | Integrated semiconductor power switching device |
| CN108718152A (en) * | 2018-06-13 | 2018-10-30 | 广东美的制冷设备有限公司 | Interleaved PFC control circuit and motor-drive circuit |
| CN108809197A (en) * | 2018-06-13 | 2018-11-13 | 广东美的制冷设备有限公司 | Interleaved PFC control circuit and motor-drive circuit |
| CN108731213A (en) * | 2018-08-16 | 2018-11-02 | 珠海恒途电子有限公司 | A kind of guard time adjusts circuit, PFC current foldback circuits and controller |
| CN111244896A (en) * | 2018-11-28 | 2020-06-05 | 安徽美芝精密制造有限公司 | Motor demagnetization protection circuit, motor and compressor |
| CN110233564A (en) * | 2019-07-05 | 2019-09-13 | 广东美的制冷设备有限公司 | Drive control circuit and household appliance |
| CN111478286A (en) * | 2020-03-17 | 2020-07-31 | 海信（山东）空调有限公司 | PFC overcurrent protection circuit, air conditioner controller and air conditioner |
| CN111478286B (en) * | 2020-03-17 | 2022-09-27 | 海信空调有限公司 | PFC overcurrent protection circuit, air conditioner controller and air conditioner |
| CN113783413A (en) * | 2021-09-03 | 2021-12-10 | 株洲市众普森技术有限公司 | Method for changing PFC output voltage |
| CN114123754A (en) * | 2021-11-05 | 2022-03-01 | 海信（广东）空调有限公司 | Overcurrent protection circuit and method and air conditioner |
| CN114337239A (en) * | 2021-12-21 | 2022-04-12 | 海信（山东）空调有限公司 | PFC protection circuit, variable frequency controller and household appliance |
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Granted publication date: 20150121 |