CN102412720B - Switching power circuit and power factor correction (PFC) control circuit thereof - Google Patents
Switching power circuit and power factor correction (PFC) control circuit thereof Download PDFInfo
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- CN102412720B CN102412720B CN201110431338.9A CN201110431338A CN102412720B CN 102412720 B CN102412720 B CN 102412720B CN 201110431338 A CN201110431338 A CN 201110431338A CN 102412720 B CN102412720 B CN 102412720B
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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
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- 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 invention provides a switching power circuit and a power factor correction (PFC) control circuit thereof. The PFC control circuit comprises a rectifier input circuit, a PFC circuit and an overvoltage and undervoltage protection circuit, wherein the overvoltage and undervoltage protection circuit is connected between the rectifier input circuit and the PFC circuit and is used for shutting off the PFC circuit when the divided voltage of a voltage division circuit in the rectifier input circuit is higher than the preset over threshold voltage or lower than the preset under threshold voltage; the over threshold voltage is set to ensure the output voltage of the high power switching power circuit to be higher than the voltage obtained after the input voltage of the switching power circuit is rectified; and the under threshold voltage is used for preventing damage of the power devices in the PFC circuit due to the fact that the PFC circuit outputs the maximum load during low voltage input. The PFC control circuit can effectively avoid the problem that the power devices in the PFC circuit are damaged because the overload is output when the voltage obtained after the output voltage is rectified is close to the voltage obtained after the input voltage is rectified or the input voltage is undervoltage and has a simple structure and low cost.
Description
Technical field
The present invention relates to switch power technology field, relate in particular to a kind of switching power circuit and power factor correction thereof (PFC) control circuit.
Background technology
In switching power circuit, conventionally use pfc circuit to carry out under-voltage and overvoltage protection.The pressure reduction that at present general pfc circuit can not be considered the voltage after output voltage and its input voltage rectification of switching power circuit is close to zero situation, and pfc circuit requires the output voltage of switching power circuit must be greater than the voltage after its input voltage rectification, otherwise in the time that the two magnitude of voltage is close, be easy to cause the damage of power device in pfc circuit, thereby affect the life-span of power supply.
Application number is the PFC equipment that 02829625.7 Chinese patent discloses a kind of Switching Power Supply, can guarantee the safety of PFC equipment when proportional at the input signal of Switching Power Supply and output voltage, but structure is comparatively complicated, and the output voltage that can not meet Switching Power Supply must be greater than the requirement of the voltage after input voltage rectification.
Summary of the invention
The object of this invention is to provide a kind of switching power circuit and PFC control circuit thereof, can not consider that to solve current pfc circuit the pressure reduction of the voltage after output voltage and its input voltage rectification of high power switching power supply circuit is close to causing the defect that in pfc circuit, power device damages in zero situation.
In order to realize above object, PFC control circuit provided by the invention comprises: rectification input circuit, and it comprises rectifier diode and bleeder circuit for the input ac voltage of described switching power circuit being carried out to rectification; Pfc circuit, it carries out power factor correction for the voltage to after rectification; Overvoltage and under-voltage protecting circuit; it is connected between described rectification input circuit and described pfc circuit; for being greater than predetermined overvoltage threshold voltage when the dividing potential drop of bleeder circuit or making described pfc circuit shutoff during lower than predetermined under-voltage threshold voltage; wherein; the voltage of the output voltage that overvoltage threshold voltage is provided so that switching power circuit after than its input voltage rectification is large, under-voltage threshold voltage when preventing low pressure input described in pfc circuit output maximum load and damage the power device of described pfc circuit.
Preferably, described bleeder circuit is resistor voltage divider circuit.
Preferably, described overvoltage and under-voltage protecting circuit chip microcontroller.
Preferably, described bleeder circuit comprises the first bleeder circuit and the second bleeder circuit, and described overvoltage and under-voltage protecting circuit comprise: switching circuit, and it is for controlling the turn-on and turn-off of described pfc circuit; Overvoltage crowbar, it is for send to described switching circuit the signal that described switching circuit is turn-offed in the time that the dividing potential drop of described the first bleeder circuit is greater than described overvoltage threshold voltage, so that described pfc circuit turn-offs; Under-voltage protecting circuit, it is for send to described switching circuit the signal that described switching circuit is turn-offed in the time that the dividing potential drop of described the second bleeder circuit is greater than described under-voltage threshold voltage, so that described pfc circuit turn-offs.
Preferably, described pfc circuit is interleaved PFC control chip.
Preferably, described interleaved PFC control chip is R2A20104.
Preferably, described the first bleeder circuit comprises the first resistance and the second resistance that are connected in series, described the second bleeder circuit comprises the 3rd resistance and the 4th resistance that are connected in series, and described overvoltage crowbar comprises: overvoltage comparator, its in-phase input end is connected to the series connection node of the 3rd resistance and the 4th resistance, its inverting input is connected to the VREF pin of described interleaved PFC control chip by the 5th resistance, its output is connected to its inverting input by the first feedback resistance, this output is connected to DC power supply by the 6th resistance simultaneously, and be connected to switching circuit, described under-voltage protecting circuit comprises: under-voltage comparator, its inverting input is connected to the series connection node of the first resistance and the second resistance, its in-phase input end is connected to the VREF pin of described interleaved PFC control chip by the 7th resistance, its output is connected to its in-phase input end by the second feedback resistance, this output is connected to DC power supply by the 8th resistance simultaneously, and is connected to switching circuit.
Preferably, described switching circuit comprises: the 3rd diode, and its positive pole is connected to the output of overvoltage comparator and under-voltage comparator, and its negative pole is connected to the SS pin of described interleaved PFC control chip.
Preferably, described switching circuit comprises: 555 timers, and its Enable Pin is connected to the output of overvoltage comparator and under-voltage comparator; The 3rd diode, its positive pole is connected to the output of timer, and its negative pole is connected to the SS pin of described interleaved PFC control chip.
In addition, the invention provides a kind of switching power circuit, it comprises above-mentioned PFC control circuit.
In PFC control circuit provided by the invention, be provided with overvoltage and under-voltage protecting circuit, detect in real time and control for the voltage after the input voltage rectification to switching power circuit, with make overvoltage or when under-voltage timely pfc circuit turn-off.By this overvoltage and under-voltage protecting circuit, effectively avoid causing in the time that the magnitude of voltage after output voltage and input voltage rectification is close or when input voltage is under-voltage output overloading to damage the problem of the power component in pfc circuit in overvoltage or when under-voltage owing to there is no to turn-off in time pfc circuit.In addition, PFC control circuit provided by the invention is simple in structure, with low cost.
Brief description of the drawings
Fig. 1 illustrates the circuit diagram of the PFC control circuit of the first embodiment of the present invention;
Fig. 2 illustrates the circuit diagram of the PFC control circuit of the second embodiment of the present invention;
Fig. 3 illustrates the circuit diagram of the PFC control circuit of the third embodiment of the present invention.
Embodiment
Below, describe the present invention with embodiment with reference to the accompanying drawings.
Generally, the PFC control circuit for switching power circuit provided by the present invention comprises rectification input circuit, pfc circuit and overvoltage and under-voltage protecting circuit.Wherein, described rectification input circuit is used for to the input voltage of switching power circuit (particularly, from the alternating voltage of the ac input circuit input of switching power circuit) carry out rectification, comprise rectifier diode and be connected to the bleeder circuit of rectifier diode.Described pfc circuit is for improving the power factor of voltage after rectification, more existing ripe interleaved PFC control chips at present, for example R2A20104.Described overvoltage and under-voltage protecting circuit are connected between described rectification input circuit and described pfc circuit; for being greater than predetermined overvoltage threshold voltage when the dividing potential drop of bleeder circuit or making described pfc circuit shutoff during lower than predetermined under-voltage threshold voltage; wherein; the voltage of the output voltage that overvoltage threshold voltage is provided so that switching power circuit after than its input voltage rectification is large, under-voltage threshold voltage pfc circuit output maximum load and damage the power device of pfc circuit when preventing low pressure input.As can be seen here; PFC control circuit provided by the present invention is to have increased an overvoltage and under-voltage protecting circuit than the improvements of existing pfc circuit; for the voltage from the voltage commutation of ac input circuit input is detected in real time and controlled, with make overvoltage or when under-voltage timely pfc circuit turn-off.
(the first embodiment)
Fig. 1 illustrates the circuit diagram of the PFC control circuit of the first embodiment of the present invention.In the present embodiment, utilize interleaved PFC control chip R2A20104 (being shown U3 in Fig. 1) as pfc circuit; Overvoltage and under-voltage protecting circuit AD chip microcontroller.Wherein, interleaved PFC control chip R2A20104 is known circuits, therefore, omits its detailed description herein.
Below, with reference to Fig. 1, the PFC control circuit of the present embodiment is described in detail.
As shown in Figure 1, the rectification input circuit of the present embodiment is made up of the first diode D1, the second diode D2, the first resistance R 1, the second resistance R 2, wherein, the positive pole of the first diode D1 and the second diode D2 is connected to respectively positive pole and the negative pole of ac input circuit; The first resistance R 1 one end serial connection to the negative pole of the first diode D1 and the second diode D2 the sys node of negative pole, its other end is connected in series with second resistance R 2 one end, the second resistance R 2 other end ground connection.
The input that is used as the AD single-chip microcomputer of overvoltage and under-voltage protecting circuit is connected to the series connection node of the first resistance R 1 and the second resistance R 2, and its output is connected to the SS pin of interleaved PFC control chip.
About the remainder circuit in Fig. 1, belong to known technology, therefore, the descriptions thereof are omitted here.
Below, the operation principle of the control circuit of PFC shown in Fig. 1 is described.
In the time that the input voltage after the input voltage rectification of ac input circuit is greater than predetermined overvoltage threshold voltage (as 265v), AD single-chip microcomputer gives SS pin one high level of interleaved PFC control chip, so that SS pin sets high, thereby interleaved PFC control chip is not worked.
When the input voltage after the input voltage rectification of ac input circuit is during lower than predetermined under-voltage threshold voltage (as 175v), AD single-chip microcomputer also gives SS pin one high level of interleaved PFC control chip, so that SS pin sets high, thereby interleaved PFC control chip is not worked.
By above-mentioned overvoltage protection; the output voltage of having guaranteed whole switching power circuit is greater than the voltage after its input voltage rectification, has avoided the pressure reduction of the voltage after output voltage and its input voltage rectification of whole switching power circuit to damage the situation of the power device in pfc circuit close to zero.By above-mentioned under-voltage protection, while having prevented low pressure input, pfc circuit is exported maximum load and is damaged the power device in pfc circuit.Therefore, by such overvoltage and under-voltage protection, guaranteed the safety of rectifier bridge, metal-oxide-semiconductor GD1 and GD2 and diode in whole switching power circuit, when protection action occurs, the output current of Current Transmit 1 and CT2 is zero.
In addition, the present embodiment utilize single-chip microcomputer at a high speed, programmable feature, can accomplish accurate voltage waveform following sampling, can be in time to circuit control take measures, realize overvoltage and under-voltage protection.
(the second embodiment)
Fig. 2 illustrates the circuit diagram of the PFC control circuit of the second embodiment of the present invention.In the present embodiment, identical with the first embodiment, utilize interleaved PFC control chip R2A20104 (being shown U3 in Fig. 2) as pfc circuit, overvoltage and under-voltage protecting circuit comprise overvoltage crowbar in parallel and under-voltage protecting circuit and be connected to overvoltage crowbar and under-voltage protecting circuit and interleaved PFC control chip between switching circuit, wherein, overvoltage crowbar is connected between the first bleeder circuit and switching circuit, for send to switching circuit the signal that switching circuit is turn-offed in the time that the dividing potential drop of the first bleeder circuit is greater than overvoltage threshold voltage, so that pfc circuit turn-offs, under-voltage protecting circuit is connected between the second bleeder circuit and switching circuit, for sending to switching circuit the signal that makes switching circuit shutoff when the dividing potential drop of the second bleeder circuit during lower than under-voltage threshold voltage, so that pfc circuit turn-offs, in switching circuit, utilize diode as switch, for controlling the turn-on and turn-off of pfc circuit.
Below, with reference to Fig. 2, the PFC control circuit of the present embodiment is described in detail.
As shown in Figure 2, the rectification input circuit of the present embodiment is by the first diode D1, the second diode D2, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4 form, wherein, the positive pole of the first diode D1 and the second diode D2 is connected to respectively positive pole and the negative pole of ac input circuit, be connected in series the series resistor (the second bleeder circuit) that forms by the first resistance R 1 and the second resistance R 2 and be connected in series series resistor (the first bleeder circuit) parallel connection forming by the 3rd resistance R 3 and the 4th resistance R 4, the sys node of the first resistance R 1 and the 3rd resistance R 3 is connected to the sys node of the negative pole of the first diode D1 and the second diode D2, the sys node ground connection of the second resistance R 2 and the 4th resistance R 4.
Overvoltage crowbar comprises the overvoltage comparator as overvoltage protection.Wherein, overvoltage comparator is that a hysteresis comparator (utilizes resistance R 9 and R6 to introduce hysteresis, with the impact of Inhibitory signal glitch noise), its in-phase input end is connected to the series connection node of the 3rd resistance R 3 and the 4th resistance R 4, its inverting input is connected to the VREF pin of interleaved PFC control chip by the 5th resistance R 5, its output is connected to its inverting input by the first feedback resistance R9, this output is connected to DC power supply VCC by the 6th resistance R 6 simultaneously, and is connected to switching circuit.
Under-voltage protecting circuit comprises the under-voltage comparator for under-voltage protection.Wherein, the inverting input of under-voltage comparator is connected to the series connection node of the first resistance R 1 and the second resistance R 2, its in-phase input end is connected to the VREF pin of interleaved PFC control chip by the 7th resistance R 7, its output is connected to its in-phase input end by the second feedback resistance R10, this output is connected to DC power supply VCC by the 8th resistance R 8 simultaneously, and is connected to switching circuit.
Switching circuit comprises diode D3, and its positive pole is connected to the output of overvoltage comparator and under-voltage comparator, and its negative pole is connected to the SS pin of interleaved PFC control chip.The SS pin of interleaved PFC control chip is by the 3rd capacitor C ground connection.
Below, the operation principle of the control circuit of PFC shown in Fig. 2 is described.
In the time that the voltage after the input voltage rectification of ac input circuit is greater than predetermined overvoltage threshold voltage (as 265V), the dividing potential drop of the 3rd resistance R 3 and the 4th resistance R 4 is greater than the overvoltage threshold voltage of overvoltage comparator, thereby overvoltage comparator is reversed, be output as high level, now the 3rd diode D3 conducting, give high level of SS pin of interleaved PFC control chip, thereby interleaved PFC control chip is not worked.Serve as after Hair Fixer life, the threshold voltage of overvoltage comparator reversion now becomes VREF voltage by the partial pressure value of the 5th resistance R 5 and the first feedback resistance R9, the dividing potential drop of the 3rd resistance R 3 and the 4th resistance R 4 must be less than this value, could allow the output of overvoltage comparator be high level, thereby again activate PFC control chip.
When the voltage after the input voltage rectification of ac input circuit is during lower than predetermined under-voltage threshold voltage (as 175V), the dividing potential drop of the first resistance R 1 and the second resistance R 2 is greater than the under-voltage threshold voltage of under-voltage comparator, thereby under-voltage comparator is reversed, be output as high level, now the 3rd diode D3 conducting, give high level of SS pin of interleaved PFC control chip, thereby interleaved PFC control chip is not worked.When after under-voltage generation, the threshold voltage of under-voltage comparator reversion now becomes VREF voltage by the partial pressure value of the 7th resistance R 7 and the second feedback resistance R10, the dividing potential drop of the first resistance R 1 and the second resistance R 2 must be less than this value, could allow the output of under-voltage comparator be high level, thereby again activate PFC control chip.
Can find out from the above description, in overvoltage protection and under-voltage protection process, overvoltage comparator and under-voltage comparator are all carried out twice thresholding comparison.Taking overvoltage comparator as example, dividing potential drop and the Vref value of the bleeder circuit of R3 and R4 composition are carried out thresholding comparison for the first time; In the time that the dividing potential drop of R3 and R4 is greater than Vref for the first time; now cause overvoltage comparator reversion; output high level; now; the comparative voltage of overvoltage protection becomes VREF voltage by the dividing potential drop (thresholding comparison for the second time) of the 5th resistance R 5 and the first feedback resistance R9, and its value and VREF have pressure reduction, utilizes this difference and then realizes the inhibition of noise signal; avoid protection action repeatedly to carry out, make protection more reliable.
The technique effect of the present embodiment is identical with the first embodiment, and therefore, the descriptions thereof are omitted.
(the 3rd embodiment)
Fig. 3 illustrates the circuit diagram of the PFC control circuit of the third embodiment of the present invention.Comparison diagram 3 is visible with Fig. 2, and the difference of the present embodiment and the second embodiment is, in switching circuit, except the 3rd diode D3, has also increased by 555 timers.The Enable Pin of 555 timers is connected to the output of overvoltage comparator and under-voltage comparator, and the positive pole of the 3rd diode D3 is connected to the output of 555 timers, and its negative pole is connected to the SS pin of interleaved PFC control chip.
Below, with reference to Fig. 3, the operation principle of the PFC control circuit to the present embodiment is described.
In the time that the voltage after the input voltage rectification of ac input circuit is greater than predetermined overvoltage threshold voltage (as 265V), the dividing potential drop of the 3rd resistance R 3 and the 4th resistance R 4 is greater than the overvoltage threshold voltage of overvoltage comparator, thereby overvoltage comparator is reversed, be output as low level, activate 555 timers, 555 timer output high level make the 3rd diode D3 conducting, give SS pin one high level of interleaved PFC control chip, thereby interleaved PFC control chip is not worked.
When the voltage after the input voltage rectification of ac input circuit is during lower than predetermined under-voltage threshold voltage (as 175V), the dividing potential drop of the first resistance R 1 and the second resistance R 2 is greater than the under-voltage threshold voltage of under-voltage comparator, thereby under-voltage comparator is reversed, be output as high level, give the Enable Pin of 555 timers, activate 555 timers, make its output high level, the 3rd diode D3 conducting, give SS pin one high level of interleaved PFC control chip, thereby interleaved PFC control chip is not worked.
The technique effect of the present embodiment is identical with the first embodiment, and therefore, the descriptions thereof are omitted.
Below with reference to drawings and Examples, the present invention be have been described in detail, still, should be appreciated that, the present invention is not limited to above disclosed exemplary embodiment.Should give claim to explain the most widely, to contain all modification, equivalent structure and the function of disclosed exemplary embodiment.
Claims (7)
1. for a power factor correction control circuit for switching power circuit, comprising:
Rectification input circuit, it comprises rectifier diode and bleeder circuit for the input ac voltage of described switching power circuit being carried out to rectification;
Circuit of power factor correction, it carries out power factor correction for the voltage to after rectification;
Overvoltage and under-voltage protecting circuit, it is connected between described rectification input circuit and described circuit of power factor correction, for being greater than predetermined overvoltage threshold voltage when the dividing potential drop of bleeder circuit or making described circuit of power factor correction shutoff during lower than predetermined under-voltage threshold voltage, wherein, the voltage of the output voltage that overvoltage threshold voltage is provided so that described switching power circuit after than its input voltage rectification is large, under-voltage threshold voltage damages the power device of described circuit of power factor correction for preventing circuit of power factor correction output maximum load described in low pressure when input,
Described bleeder circuit comprises the first bleeder circuit and the second bleeder circuit,
Described overvoltage and under-voltage protecting circuit comprise:
Switching circuit, it is for controlling the turn-on and turn-off of described circuit of power factor correction;
Overvoltage crowbar, it is for send to described switching circuit the signal that described switching circuit is turn-offed in the time that the dividing potential drop of described the first bleeder circuit is greater than described overvoltage threshold voltage, so that described circuit of power factor correction turn-offs;
Under-voltage protecting circuit, it is for sending to described switching circuit the signal that described switching circuit is turn-offed when the dividing potential drop of described the second bleeder circuit during lower than described under-voltage threshold voltage, so that described circuit of power factor correction turn-offs;
Described circuit of power factor correction is alternating expression Power Factor Correction Control chip;
Described the first bleeder circuit comprises the first resistance and the second resistance that are connected in series, and described the second bleeder circuit comprises the 3rd resistance and the 4th resistance that are connected in series, and
Described overvoltage crowbar comprises:
Overvoltage comparator, its in-phase input end is connected to the series connection node of the 3rd resistance and the 4th resistance, its inverting input is connected to the VREF pin of described alternating expression Power Factor Correction Control chip by the 5th resistance, its output is connected to its inverting input by the first feedback resistance, this output is connected to DC power supply by the 6th resistance simultaneously, and is connected to switching circuit;
Described under-voltage protecting circuit comprises:
Under-voltage comparator, its inverting input is connected to the series connection node of the first resistance and the second resistance, its in-phase input end is connected to the VREF pin of described alternating expression Power Factor Correction Control chip by the 7th resistance, its output is connected to its in-phase input end by the second feedback resistance, this output is connected to DC power supply by the 8th resistance simultaneously, and is connected to switching circuit.
2. power factor correction control circuit according to claim 1, is characterized in that, described bleeder circuit is resistor voltage divider circuit.
3. power factor correction control circuit according to claim 1, is characterized in that, described overvoltage and under-voltage protecting circuit chip microcontroller.
4. power factor correction control circuit according to claim 1, is characterized in that, described alternating expression Power Factor Correction Control chip is R2A20104.
5. power factor correction control circuit according to claim 1, is characterized in that, described switching circuit comprises:
The 3rd diode, its positive pole is connected to the output of overvoltage comparator and under-voltage comparator, and its negative pole is connected to the SS pin of described alternating expression Power Factor Correction Control chip.
6. power factor correction control circuit according to claim 1, is characterized in that, described switching circuit comprises:
555 timers, its Enable Pin is connected to the output of overvoltage comparator and under-voltage comparator;
The 3rd diode, its positive pole is connected to the output of timer, and its negative pole is connected to the SS pin of described alternating expression Power Factor Correction Control chip.
7. a switching power circuit, is characterized in that, comprises the power factor correction control circuit described in any one in claim 1-6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110431338.9A CN102412720B (en) | 2011-12-20 | 2011-12-20 | Switching power circuit and power factor correction (PFC) control circuit thereof |
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| CN201110431338.9A CN102412720B (en) | 2011-12-20 | 2011-12-20 | Switching power circuit and power factor correction (PFC) control circuit thereof |
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| CN102412720A CN102412720A (en) | 2012-04-11 |
| CN102412720B true CN102412720B (en) | 2014-10-01 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102801299B (en) * | 2012-07-18 | 2016-03-30 | 华为技术有限公司 | The control method of power factor corrector and uninterrupted power supply |
| JP5804019B2 (en) * | 2013-10-16 | 2015-11-04 | ダイキン工業株式会社 | Power converter |
| CN103780076B (en) * | 2014-02-21 | 2017-01-04 | 奇瑞汽车股份有限公司 | A kind of high power switching power supply |
| CN103986322A (en) * | 2014-06-10 | 2014-08-13 | 深圳市英可瑞科技开发有限公司 | PFC (positive feedback circuit) control circuit |
| CN105932646A (en) * | 2016-06-16 | 2016-09-07 | 广东欧珀移动通信有限公司 | Undervoltage protection circuit and power supply |
| CN106329908A (en) * | 2016-11-16 | 2017-01-11 | 昆山华恒焊接股份有限公司 | Welding power circuit |
| CN108270351B (en) * | 2018-01-08 | 2019-04-12 | 深圳市崧盛电子股份有限公司 | A kind of constant current output circuit and power supply of increase power factor correction efficiency |
| CN108242796A (en) * | 2018-01-12 | 2018-07-03 | 特灵空调系统(中国)有限公司 | The protective device of electric system and its guard method, electric system |
| CN108418413B (en) * | 2018-01-12 | 2020-02-28 | 青岛海尔空调电子有限公司 | Three-phase staggered PFC control method and system |
| CN111490691A (en) * | 2020-05-21 | 2020-08-04 | 四川虹美智能科技有限公司 | Adaptive boosting apparatus and method |
| WO2022041165A1 (en) * | 2020-08-29 | 2022-03-03 | 华为数字能源技术有限公司 | Power factor correction circuit and power converter |
| CN112600160B (en) * | 2020-12-04 | 2023-01-17 | 海信空调有限公司 | PFC circuit protection device and air conditioner |
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| US6697955B1 (en) * | 2000-07-20 | 2004-02-24 | International Business Machines Corporation | Method and apparatus for using an energy reserve to provide voltage to a power factor correction circuit in the event of a power interuption |
| EP1540801A1 (en) * | 2002-09-20 | 2005-06-15 | STMicroelectronics S.r.l. | Power factor correction device for switching power supplies |
| CN101325366A (en) * | 2007-06-14 | 2008-12-17 | 海尔集团公司 | Circuit with protective circuit for correcting active power factor |
| US8841896B2 (en) * | 2008-09-05 | 2014-09-23 | Eaton Industries Company | Power factor corrected switched mode power supply |
| CN101557162B (en) * | 2009-03-11 | 2011-06-15 | 西安民展微电子有限公司 | Overvoltage protection circuit used in power factor corrector and power factor corrector |
| CN201813314U (en) * | 2010-09-20 | 2011-04-27 | 石家庄国耀电子科技有限公司 | Alternating voltage sampling circuit of AC powered active power factor correction circuit |
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