CN116780885A - Power factor corrector, power factor correction circuit and electronic equipment - Google Patents

Power factor corrector, power factor correction circuit and electronic equipment Download PDF

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Publication number
CN116780885A
CN116780885A CN202310714983.4A CN202310714983A CN116780885A CN 116780885 A CN116780885 A CN 116780885A CN 202310714983 A CN202310714983 A CN 202310714983A CN 116780885 A CN116780885 A CN 116780885A
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CN
China
Prior art keywords
power switch
energy storage
storage element
voltage source
current
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CN202310714983.4A
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Chinese (zh)
Inventor
请求不公布姓名
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Ensai Semiconductor Chengdu Co ltd
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Ensai Semiconductor Chengdu Co ltd
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Publication of CN116780885A publication Critical patent/CN116780885A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/08—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in parallel

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a power factor corrector, a power factor correction circuit and electronic equipment, wherein the power factor corrector is coupled with an alternating current voltage source, an output capacitor and a load, and comprises the following components: a first ac-dc converter, a second ac-dc converter, the first ac-dc converter operating during a first half-cycle of the ac voltage source; the second AC-DC converter works in the second half period of the AC voltage source, and the power factor corrector realizes the same phase change of the voltage and the current of the AC voltage source through the alternate work of the first AC-DC converter and the second AC-DC converter, thereby realizing the power factor correction.

Description

Power factor corrector, power factor correction circuit and electronic equipment
Technical Field
The invention relates to the technical field of power supply conversion, in particular to a power factor corrector, a power factor correction circuit and electronic equipment.
Background
In the prior art, high-power application needs to have a power factor requirement, for example, from 8 months of 2016, according to the requirements of IEC61000-3-2 and other standards, power application with power higher than 75W needs to increase Power Factor Correction (PFC), and power lower than 75W does not have the requirement. The power supply circuit commonly used realizes the function of power factor correction and obtains constant output electric signals, for example, the power supply circuit adopts the power factor correction circuit and outputs relatively stable direct current voltage; the post-stage power supply circuit adopts a direct current-direct current power supply circuit to realize constant and strobe-free output voltage or output current.
In the prior art power factor correction circuit, the power consumption of a diode rectifier bridge coupled with an ac voltage source is also a real problem that has to be considered.
Disclosure of Invention
First aspect
The invention provides a power factor corrector, which is coupled with an alternating voltage source, an output capacitor and a load, and comprises the following components: the input end of the first alternating current-direct current converter receives a first end of the alternating current voltage source as an input voltage anode, a second end of the alternating current voltage source as an input voltage cathode, and the output end of the first alternating current-direct current converter is coupled with the output capacitor and the load; the input end of the second alternating current-direct current converter receives the second end of the alternating current voltage source as an input voltage anode, the first end of the alternating current voltage source as an input voltage cathode, and the output end of the second alternating current-direct current converter is coupled with the output capacitor and the load; the first AC-DC converter and the second AC-DC converter share a first power switch; the first AC-DC converter works in a first half period of the AC voltage source, and does not work in a second half period; the second AC-DC converter operates in a second half period of the AC voltage source, and does not operate in the first half period; the power factor corrector realizes the same phase change of the voltage and the current of an alternating current voltage source through the alternating operation of the first alternating current-direct current converter and the second alternating current-direct current converter, thereby realizing the power factor correction.
Preferably, the first ac-dc converter includes a first energy storage element, a first rectifying module, a first power switch and a second power switch;
the first end of the first energy storage element is coupled with the first end of the alternating voltage source, the second end of the first energy storage element is coupled with the first end of the first power switch, the second end of the first energy storage element is coupled with the output capacitor after passing through the first rectifying module, the output capacitor generates output voltage, and the second power switch is coupled between the second end of the first power switch and the second end of the alternating voltage source; or (b)
The first end of the first energy storage element is coupled with the first end of the alternating current voltage source, the second end of the first energy storage element is coupled with the first end of the first power switch, the third end of the first energy storage element is coupled with the positive plate of the output capacitor after passing through the first rectifying module, the fourth end of the first energy storage element is coupled with the negative plate of the output capacitor, the output capacitor generates output voltage, and the second power switch is coupled between the second end of the first power switch and the second end of the alternating current voltage source;
the second alternating current-direct current converter comprises a second energy storage element, a second rectifying module, a first power switch and a third power switch;
The first end of the second energy storage element is coupled with the second end of the alternating current voltage source, the second end of the second energy storage element is coupled with the first end of the first power switch, the second end of the second energy storage element is coupled with the output capacitor after passing through the second rectifying module, the output capacitor generates output voltage, and the third power switch is coupled between the second end of the first power switch and the first end of the alternating current voltage source; or (b)
The first end of the second energy storage element is coupled with the second end of the alternating current voltage source, the second end of the second energy storage element is coupled with the first end of the first power switch, the third end of the second energy storage element is coupled with the positive plate of the output capacitor after passing through the second rectifying module, the fourth end of the second energy storage element is coupled with the negative plate of the output capacitor, the output voltage is generated on the output capacitor, and the third power switch is coupled between the second end of the first power switch and the first end of the alternating current voltage source.
Preferably, the first rectifying module and the second rectifying module are diodes, or the first rectifying module and the second rectifying module are metal oxide semiconductor field effect transistors;
the power factor corrector further comprises a control module and a detection resistor, wherein the detection resistor is positioned between the second end of the first power switch and the second ends of the second power switch and the third power switch and is used for detecting the current flowing through the first power switch and generating a detection signal, and the control module is coupled with the detection signal and controls the on and off of the first power switch according to the detection signal.
Second aspect
The invention also provides a power factor correction circuit coupled with an alternating voltage source, an output capacitor and a load, which is characterized by comprising: the energy storage device comprises a first energy storage element and a second energy storage element, wherein the first energy storage element is an inductor or a transformer, and the second energy storage element is an inductor or a transformer;
in a first half period of an alternating current voltage source, in a first working state, a first path receives voltage of the first half period of the alternating current voltage source to store energy of the first energy storage element, and first current flowing through the first energy storage element rises; in a second operating state, the first energy storage element releases energy to the output capacitor through a second path to generate an output voltage on the output capacitor, and the first current drops; in a second half period of the alternating current voltage source, in a third working state, the third path receives the voltage of the second half period of the alternating current voltage source to store energy of the second energy storage element, and the second current flowing through the second energy storage element rises; in a fourth operating state, the second energy storage element releases energy to the output capacitor through a fourth path to generate the output voltage on the output capacitor, and the second current drops.
Preferably, the power factor correction circuit comprises a first power switch, a second power switch and a third power switch;
in a first working state of a first half cycle of the alternating-current voltage source, the first current flows through the alternating-current voltage source, the first energy storage element, the first rectifying module, the first power switch and the second power switch;
in a second working state of a first half period of the alternating current voltage source, the first current flows through the first energy storage element, the first rectifying module, the output capacitor and the load;
in a third working state of a second half period of the alternating voltage source, the second current flows through the alternating voltage source, the second energy storage element, the second rectifying module, the first power switch and the third power switch;
in a fourth operating state of the second half-cycle of the alternating voltage source, the second current flows through the second energy storage element, the second rectifying module, the output capacitor and the load.
Preferably, in the first working state and the second working state, the first path and the second path through which the first current flows, and components except the alternating voltage source form a first alternating-current-direct current converter;
in the third working state and the fourth working state, the third path and the fourth path through which the second current flows, and components except an alternating current voltage source form a second alternating current-direct current converter;
The first AC-DC converter and the second AC-DC converter are both of a boost topology or a flyback topology.
Preferably, the power factor correction circuit further includes:
the detection resistor is positioned on a common path of the first path and the third path and is used for detecting the first current and the second current and generating a detection signal;
the control module is coupled with the detection signal and used for generating a first control signal according to the received detection signal to drive the first power switch to be turned on or turned off.
Preferably, the power factor correction circuit further comprises a control chip, the control chip is integrated with the control module, and the control chip realizes the same phase change of the input voltage and the input current of the alternating-current voltage source by controlling the on or off of the first power switch, the second power switch and the third power switch, thereby realizing the power factor correction.
Preferably, part or all of the second power switch and the third power switch are diodes.
Third aspect of the invention
An embodiment of the present invention provides an electronic device, including a power factor corrector or a power factor correction circuit as described in any one of the first aspect and the second aspect.
The technology of the invention has the following advantages:
according to the power factor corrector, a diode rectifier bridge coupled with an alternating voltage source is eliminated, and the efficiency and the performance are improved.
Drawings
FIGS. 1A-1D are schematic illustrations of 4 operational states of one embodiment of the present invention;
FIGS. 2A-2D are schematic illustrations of 4 operational states of one embodiment of the present invention;
FIGS. 3A-3D are schematic illustrations of 4 operational states of one embodiment of the present invention;
FIG. 4 is a schematic diagram of one embodiment of the present invention;
fig. 5 is a block diagram of the structure of the present invention.
Various features and elements are not drawn to scale in accordance with conventional practice in the drawings in order to best illustrate the specific features and elements associated with the invention. In addition, like elements/components are referred to by the same or similar reference numerals among the different drawings.
[ reference numerals description ]
11X (x=1-4): x-th control module
510: first AC-DC converter
520: second AC-DC converter
[ symbolic description ]
L1X (x=1-4): first energy storage element
L2X (x=1-4): second energy storage element
P (1) -P (4): first path-fourth path
Ich1-Ich2 first current-second current
MP1-MP3: first power switch-third power switch
GP1-GP3: first control signal-third control signal
DXY (x=1-4, y=1-4): rectifying tube
RCS: detection resistor
VCS: detecting a signal
VAC: AC voltage source
VAC1: first end
VAC2: second end
CO: output capacitor
VO: and outputting the voltage.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
First aspect
The present invention provides a power factor corrector, as shown in fig. 5, coupled with an ac voltage source VAC, an output capacitor CO and a load, comprising: a first ac-dc converter 510 having an input terminal receiving a first terminal VAC1 of an ac voltage source VAC as an input voltage anode, a second terminal VAC2 of the ac voltage source VAC as an input voltage cathode, and an output terminal coupled to an output capacitor CO and a load; a second ac-dc converter 520 having an input terminal receiving a second terminal VAC2 of the ac voltage source VAC as an input voltage anode, a first terminal VAC1 of the ac voltage source VAC as an input voltage cathode, and an output terminal coupled to the output capacitor CO and the load; the first ac-dc converter 510 and the second ac-dc converter 520 share the first power switch MP1; the first ac-dc converter 510 operates during a first half cycle of the ac voltage source VAC and does not operate during a second half cycle; the second ac-dc converter 520 operates during the second half period of the ac voltage source VAC and does not operate during the first half period; the power factor corrector realizes the same phase change of the voltage and the current of the ac voltage source VAC through the alternate operation of the first ac-dc converter 510 and the second ac-dc converter 520, thereby realizing the power factor correction.
In one embodiment, as shown in fig. 1A, the first ac-dc converter 510 includes a first energy storage element L11, a first rectifying module, a first power switch MP1 and a second power switch MP2; the first rectifying module comprises a rectifying tube D11 and a rectifying tube D21; the first end of the first energy storage element L11 is coupled to the first end VAC1 of the ac voltage source VAC, the second end of the first energy storage element L11 is coupled to the first end of the first power switch MP1 after passing through the rectifying tube D21 of the first rectifying module, the second end of the first energy storage element L11 is coupled to the output capacitor CO after passing through the rectifying tube D11 of the first rectifying module, the output capacitor CO generates the output voltage VO, and the second power switch MP2 is coupled between the second end of the first power switch MP1 and the second end VAC2 of the ac voltage source VAC.
In one embodiment, as shown in fig. 2A, the first ac-dc converter 510 includes a first energy storage element L12, a first rectifying module, a first power switch MP1 and a second power switch MP2; the first rectifying module comprises a rectifying tube D12 and a rectifying tube D32; the first end of the first energy storage element L12 is coupled to the first end VAC1 of the ac voltage source VAC, the second end of the first energy storage element L12 is coupled to the first end of the first power switch MP1 after passing through the rectifying tube D12 of the first rectifying module, the second end of the first energy storage element L12 is coupled to the output capacitor CO after passing through the rectifying tube D12 and the rectifying tube D32 of the first rectifying module, the output voltage VO is generated on the output capacitor CO, and the second power switch MP2 is coupled between the second end of the first power switch MP1 and the second end VAC2 of the ac voltage source VAC.
In one embodiment, as shown in fig. 3A, the first ac-dc converter 510 includes a first energy storage element L13, a first rectifying module, a first power switch MP1 and a second power switch MP2; the first rectifying module comprises a rectifying tube D13 and a rectifying tube D33; the first end of the first energy storage element L13 is coupled with the first end VAC1 of the alternating voltage source VAC, the second end of the first energy storage element L13 is coupled with the first end of the first power switch MP1 after passing through the rectifying tube D33 of the first rectifying module, the third end of the first energy storage element L13 is coupled with the positive plate of the output capacitor CO after passing through the rectifying tube D13 of the first rectifying module, the fourth end of the first energy storage element L1 is coupled with the negative plate of the output capacitor CO, and the output voltage VO is generated on the output capacitor CO; the second power switch MP2 is coupled between the second terminal of the first power switch MP1 and the second terminal VAC2 of the ac voltage source VAC.
In one embodiment, as shown in fig. 4, the working principle of the embodiment of fig. 4 is the same as that of fig. 3A, and the two are different from each other in the position of the rectifying tube D33 in the first rectifying module, but the functions of the two are the same, so the description will not be described in detail.
In one embodiment, as shown in fig. 1C, the second ac-dc converter 520 includes a second energy storage element L21, a second rectifying module, a first power switch MP1 and a third power switch MP3; the second rectifying module comprises a rectifying tube D31 and a rectifying tube D41; the first end of the second energy storage element L21 is coupled to the second end VAC2 of the ac voltage source VAC, the second end of the second energy storage element L21 is coupled to the first end of the first power switch MP1 after passing through the rectifying tube D41 of the second rectifying module, the second end of the second energy storage element L21 is coupled to the output capacitor CO after passing through the rectifying tube D31 of the second rectifying module, the output voltage VO is generated on the output capacitor CO, and the third power switch MP3 is coupled between the second end of the first power switch MP1 and the first end VAC1 of the ac voltage source VAC.
In one embodiment, as shown in fig. 2C, the second ac-dc converter 520 includes a second energy storage element L22, a second rectifying module, a first power switch MP1 and a third power switch MP3; the second rectifying module comprises a rectifying tube D22 and a rectifying tube D32; the first end of the second energy storage element L22 is coupled to the second end VAC2 of the ac voltage source VAC, the second end of the second energy storage element L22 is coupled to the first end of the first power switch MP1 after passing through the rectifying tube D22 of the second rectifying module, the second end of the second energy storage element L22 is coupled to the output capacitor CO after passing through the rectifying tube D22 and the rectifying tube D32 of the second rectifying module, the output voltage VO is generated on the output capacitor CO, and the third power switch MP3 is coupled between the second end of the first power switch MP1 and the first end VAC1 of the ac voltage source VAC.
In one embodiment, as shown in fig. 3C, the second ac-dc converter 520 includes a second energy storage element L23, a second rectifying module, a first power switch MP1 and a third power switch MP3; the second rectifying module comprises a rectifying tube D23 and a rectifying tube D43; the first end of the second energy storage element L23 is coupled to the second end VAC2 of the ac voltage source VAC, the second end of the second energy storage element L23 is coupled to the first end of the first power switch MP1 after passing through the rectifying tube D43 of the second rectifying module, the third end of the second energy storage element L23 is coupled to the positive plate of the output capacitor CO after passing through the rectifying tube D23 of the second rectifying module, the fourth end of the second energy storage element is coupled to the negative plate of the output capacitor, an output voltage is generated on the output capacitor, and the third power switch MP3 is coupled between the second end of the first power switch MP1 and the first end VAC1 of the ac voltage source VAC.
In one embodiment, as shown in fig. 4, the working principle of the embodiment of fig. 4 is the same as that of fig. 3A, and the two are different from each other in the position of the rectifying tube D43 in the first rectifying module, but the functions of the two are the same, so the description will not be described in detail.
In one embodiment, the first rectifying module and/or the second rectifying module at least includes one or more rectifying tubes, and when the rectifying tubes are diodes, the first ac-dc converter 510 and the second ac-dc converter 520 form a diode-rectified asynchronous rectifying structure, which is equivalent to the first ac-dc converter 510 and the second ac-dc converter 520 being asynchronous rectifying structures.
In one embodiment, the first rectifying module and/or the second rectifying module at least includes one or more rectifying tubes, and when the rectifying tubes are Metal Oxide Semiconductor Field Effect Transistors (MOSFETs), the first ac-dc converter 510 and the second ac-dc converter 520 form a synchronous rectifying structure of the Metal Oxide Semiconductor Field Effect Transistors (MOSFETs), which is equivalent to the first ac-dc converter 510 and the second ac-dc converter 520 being synchronous rectifying structures, the synchronous rectifying structure has a higher conversion efficiency than the asynchronous rectifying structure in high power applications.
In one embodiment, as shown in fig. 1A-1D, the power factor corrector further comprises a control module 111 and a detection resistor RCS; the detection resistor RCS is located between the second end of the first power switch MP1 and the second ends of the second power switch MP2 and the third power switch MP3, and is configured to detect a current flowing through the first power switch MP1 and generate a detection signal VCS, and the control module 111 is coupled to the detection signal VCS and controls on and off of the first power switch MP1 according to the detection signal VCS.
In one embodiment, as shown in fig. 2A-2D, the power factor corrector further comprises a control module 112 and a detection resistor RCS; the detection resistor RCS is located between the second end of the first power switch MP1 and the second ends of the second power switch MP2 and the third power switch MP3, and is configured to detect a current flowing through the first power switch MP1 and generate a detection signal VCS, and the control module 112 is coupled to the detection signal VCS and controls on and off of the first power switch MP1 according to the detection signal VCS.
In one embodiment, as shown in fig. 3A-3D, the power factor corrector further comprises a control module 113 and a detection resistor RCS; the detection resistor RCS is located between the second end of the first power switch MP1 and the second ends of the second power switch MP2 and the third power switch MP3, and is configured to detect a current flowing through the first power switch MP1 and generate a detection signal VCS, and the control module 113 is coupled to the detection signal VCS and controls on and off of the first power switch MP1 according to the detection signal VCS.
In one embodiment, as shown in fig. 1A, in a first half cycle of the ac voltage source VAC, if the voltage at the first end VAC1 is higher than the voltage at the second end VAC2 (which is assumed, but not limited, for convenience of description only), the second power switch MP2 is turned on, which corresponds to zero voltage of VAC2, and the third power switch MP3 is turned off. The first power switch MP1, the first energy storage element L11, the rectifier tube D21 and the rectifier tube D11 in the first rectifier module, and the output capacitor CO form an independent boost converter. The sinusoidal positive half-wave voltage of the alternating-current voltage source VAC charges and stores energy in the first energy storage element L11 through the first power switch MP1, and the first path P (1) of the first current Ich1 flowing out from the first end VAC1 of the alternating-current voltage source VAC flows through the first energy storage element L11, the rectifying tube D21 and the first power switch MP1, and then flows back to the second end VAC2 of the alternating-current voltage source VAC through the second power switch MP 2; as shown in fig. 1B, after the first power switch MP1 is turned off, the first energy storage element L11 starts to discharge, and at this time, the second power switch MP2 is in a turned-on state; the second path P (2) of the first current Ich1 passes through the first energy storage element L11, the rectifying tube D11, the output capacitor CO and the load, and the second power switch MP2 flows back to the second end VAC2 of the ac voltage source VAC; the first control module 111 achieves transfer of energy of the first half period of the ac voltage source VAC to the output capacitor CO and the load and achieves the boost power factor correction function by controlling on and off of the first power switch MP1 by the first ac-dc converter 510.
In the second half period of the ac voltage source VAC, as shown in fig. 1C, the voltage at the second end VAC2 is higher than the voltage at the first end VAC1, the third power switch MP3 is turned on, which corresponds to zero voltage VAC1, and at this time, the second power switch MP2 is turned off, and the first power switch MP1, the second energy storage element L21, the rectifying tube D31 and the rectifying tube D41 in the second rectifying module, and the output capacitor CO form an independent boost converter. The sinusoidal negative half-wave voltage of the alternating-current voltage source VAC charges and stores energy in the second energy storage element L21 through the first power switch MP1, and the third path P (3) of the second current Ich2 flowing out from the second end VAC2 of the alternating-current voltage source VAC flows through the second energy storage element L21, the rectifying tube D41 and the first power switch MP1, and then flows back to the first end VAC1 of the alternating-current voltage source VAC through the third power switch MP 3; as shown in fig. 1D, after the first power switch MP1 is turned off, the second energy storage element L21 starts to discharge, and at this time, the third power switch MP3 is in a turned-on state; the fourth path P (4) of the second current Ich2 passes through the second energy storage element L21, the rectifying tube D31, the output capacitor CO and the load, and the third power switch MP3 flows back to the first end VAC1 of the ac voltage source VAC; the first control module 111 achieves transfer of energy of the second half period of the ac voltage source VAC to the output capacitor CO and the load and achieves the boost power factor correction function by controlling on and off of the first power switch MP1, and the second ac-dc converter 520.
The power factor corrector implements boost power factor correction for the entire cycle of the ac voltage source VAC by the combined operation of the first ac-dc converter 510 and the second ac-dc converter 520.
According to the operation principle of the boost converter, the input current peak value Iinpk of the ac voltage source VAC can be calculated by the formula: iinpk=vin/l×ton, where Iinpk represents an input current peak value, vin represents a sinusoidal half-wave dc input voltage, L represents inductance values of the first energy storage element L11 and the second energy storage element L21, where the inductance value L is a constant, and when the on time ton is controlled to be constant by the first control module 111, the input current peak value Iinpk is in a proportional relationship with the sinusoidal half-wave dc input voltage Vin, so that the input current peak value Iinpk follows the sinusoidal half-wave dc input voltage Vin, thereby obtaining a higher power factor.
In one embodiment, as shown in fig. 2A, in a first half cycle of the ac voltage source VAC, if the voltage at the first end VAC1 is higher than the voltage at the second end VAC2 (which is assumed, but not limited, for convenience of description only), the second power switch MP2 is turned on, which corresponds to zero voltage of VAC2, and the third power switch MP3 is turned off. The first power switch MP1, the first energy storage element L12, the rectifying tube D12 and the rectifying tube D32 in the first rectifying module and the output capacitor CO form an independent boost converter; the sinusoidal positive half-wave voltage of the alternating-current voltage source VAC charges and stores energy in the first energy storage element L12 through the first power switch MP1, and the first path P (1) of the first current Ich1 flowing out from the first end VAC1 of the alternating-current voltage source VAC flows through the first energy storage element L12, the rectifying tube D12 and the first power switch MP1, and then flows back to the second end VAC2 of the alternating-current voltage source VAC through the second power switch MP 2; as shown in fig. 2B, after the first power switch MP1 is turned off, the first energy storage element L12 starts to discharge, and at this time, the second power switch MP2 is in a turned-on state; the second path P (2) of the first current Ich1 passes through the first energy storage element L12, the rectifying tubes D12 and D32, the output capacitor CO and the load, and the second power switch MP2 is reflowed to the second end VAC2 of the ac voltage source VAC. The second control module 112 performs transfer of the first half-period energy of the ac voltage source VAC to the output capacitor CO and the load and performs a boost power factor correction function by controlling on and off of the first power switch MP1 by the first ac-dc converter 510.
In the second half period of the ac voltage source VAC, as shown in fig. 2C, the voltage at the second end VAC2 is higher than the voltage at the first end VAC1, the third power switch MP3 is turned on, which corresponds to zero voltage VAC1, at this time, the second power switch MP2 is turned off, and the first power switch MP1, the second energy storage element L22, the rectifying tube D22 and the rectifying tube D32 in the second rectifying module, and the output capacitor CO form an independent boost converter; the sinusoidal negative half-wave voltage of the alternating-current voltage source VAC charges and stores energy in the second energy storage element L22 through the first power switch MP1, and the third path P (3) of the second current Ich2 flowing out from the second end VAC2 of the alternating-current voltage source VAC flows through the second energy storage element L22, the rectifying tube D22 and the first power switch MP1, and then flows back to the first end VAC1 of the alternating-current voltage source VAC through the third power switch MP 3; as shown in fig. 2D, after the first power switch MP1 is turned off, the second energy storage element L22 starts to discharge, and at this time, the third power switch MP3 is in a turned-on state; the fourth path P (4) of the second current Ich2 passes through the second energy storage element L22, the rectifying tubes D22 and D32, the output capacitor CO and the load, and the third power switch MP3 returns to the first end VAC1 of the ac voltage source VAC. The second control module 112 performs transfer of energy of the second half period of the ac voltage source VAC to the output capacitor CO and the load and performs a boost power factor correction function by controlling on and off of the first power switch MP1 by the second ac-dc converter 520.
The power factor corrector implements boost power factor correction for the entire cycle of the ac voltage source VAC by the combined operation of the first ac-dc converter 510 and the second ac-dc converter 520.
According to the operation principle of the boost converter, the input current peak value Iinpk of the ac voltage source VAC can be calculated by the formula: iinpk=vin/l×ton, where Iinpk represents an input current peak value, vin represents a sinusoidal half-wave dc input voltage, L represents inductance values of the first energy storage element L12 and the second energy storage element L22, where the inductance value L is a constant, and when the second control module 112 controls the on time ton to be constant, the input current peak value Iinpk is in a proportional relationship with the sinusoidal half-wave dc input voltage Vin, so that the input current peak value Iinpk follows the sinusoidal half-wave dc input voltage Vin, thereby obtaining a higher power factor.
In one embodiment, as shown in fig. 3A, in a first half cycle of the ac voltage source VAC, if the voltage at the first end VAC1 is higher than the voltage at the second end VAC2 (which is assumed, but not limited, for convenience of description only), the second power switch MP2 is turned on, which corresponds to zero voltage of VAC2, and the third power switch MP3 is turned off. The first power switch MP1, the first energy storage element L13, the rectifying tube D13 and the rectifying tube D33 in the first rectifying module and the output capacitor CO form an independent flyback converter; the sinusoidal positive half-wave voltage of the alternating-current voltage source VAC charges and stores energy in the first energy storage element L13 through the first power switch MP1, and the first path P (1) of the first current Ich1 flowing out from the first end VAC1 of the alternating-current voltage source VAC flows through the first energy storage element L13, the rectifying tube D33 and the first power switch MP1, and then flows back to the second end VAC2 of the alternating-current voltage source VAC through the second power switch MP 2; as shown in fig. 3B, after the first power switch MP1 is turned off, the first energy storage element L13 starts to discharge, and at this time, the second power switch MP2 is in a turned-on state; the second path P (2) of the first current Ich1 passes through the first energy storage element L13, the rectifying tube D13, the output capacitor CO and the load. The third control module 113 performs transfer of the first half-period energy of the ac voltage source VAC to the output capacitor CO and the load and performs a flyback power factor correction function by controlling on and off of the first power switch MP1 by the first ac-dc converter 510.
In the second half period of the ac voltage source VAC, as shown in fig. 3C, the voltage at the second end VAC2 is higher than the voltage at the first end VAC1, the third power switch MP3 is turned on, which corresponds to zero voltage VAC1, at this time, the second power switch MP2 is turned off, and the first power switch MP1, the second energy storage element L23, the rectifying tube D23 and the rectifying tube D43 in the second rectifying module, and the output capacitor CO form an independent flyback converter; the sinusoidal negative half-wave voltage of the alternating-current voltage source VAC charges and stores energy in the second energy storage element L23 through the first power switch MP1, and the third path P (3) of the second current Ich2 flowing out from the second end VAC2 of the alternating-current voltage source VAC flows through the second energy storage element L23, the rectifying tube D43 and the first power switch MP1, and then flows back to the first end VAC1 of the alternating-current voltage source VAC through the third power switch MP 3; as shown in fig. 3D, after the first power switch MP1 is turned off, the second energy storage element L23 starts to discharge, and at this time, the third power switch MP3 is in a turned-on state; the fourth path P (4) of the second current Ich2 passes through the second energy storage element L23, the rectifying tube D23, the output capacitor CO and the load. The third control module 113 performs transfer of energy of the second half period of the ac voltage source VAC to the output capacitor CO and the load and performs a flyback power factor correction function by controlling on and off of the first power switch MP1 by the second ac-dc converter 520.
The power factor corrector achieves flyback power factor correction for the entire cycle of the ac voltage source VAC by the combined operation of the first ac-dc converter 510 and the second ac-dc converter 520.
According to the operating principle of the flyback converter, the input current peak value Iinpk of the ac voltage source VAC can be calculated by the formula: iinpk=vin/l×ton, where Iinpk represents an input current peak value, vin represents a sinusoidal half-wave dc input voltage, L represents a primary winding inductance value of the first energy storage element L13 and a primary winding inductance value of the second energy storage element L23, where the inductance value L is a constant, and when the third control module 113 controls the on time ton to be constant, the input current peak value Iinpk is in a proportional relationship with the sinusoidal half-wave dc input voltage Vin, so that it is achieved that the input current peak value Iinpk follows the sinusoidal half-wave dc input voltage Vin, thereby obtaining a higher power factor.
Second aspect
The invention also provides a power factor correction circuit coupled to an ac voltage source VAC, an output capacitor CO and a load, as shown in fig. 1A-1D, comprising: the first energy storage element L11 and the second energy storage element L21 also comprise a first power switch MP1, a second power switch MP2 and a third power switch MP3, wherein the first energy storage element L11 is a main-stage winding of an inductor or a transformer, and the second energy storage element L21 is a main-stage winding of the inductor or the transformer; in the first half cycle of the ac voltage source VAC, in the first operating state, as shown in fig. 1A, the first power switch MP1 is in an on state, the second power switch MP2 is in an on state, the third power switch MP3 is in an off state, the first path P (1) receives the voltage of the first half cycle of the ac voltage source VAC to store energy in the first energy storage element L11, and the first current Ich1 flowing through the first energy storage element L11 rises; the first current Ich1 of the first path P (1) flows through the alternating voltage source VAC, the first energy storage element L11, the rectifying tube D21, the first power switch MP1, the detection resistor RCS and the second power switch MP2; the first current Ich1 generates a sense signal VCS at a sense resistor RCS that may be used to provide over-current protection for the first power switch MP1, as well as for generating a load current feedback for stabilizing the output current or voltage VO.
In the second operating state, as shown in fig. 1B, the first power switch MP1 is in an off state, the second power switch MP2 is in an on state, the third power switch MP3 is in an off state, the first energy storage element L11 releases energy to the output capacitor CO through the second path P (2) to generate the output voltage VO on the output capacitor CO, and the first current Ich1 drops; the first current Ich1 of the second path P (2) flows through the ac voltage source VAC, the first energy storage element L11, the rectifying tube D11, the output capacitor CO and the load, and the second power switch MP2.
In the second half period of the ac voltage source, in the third operating state, as shown in fig. 1C, the first power switch MP1 is in an on state, the second power switch MP2 is in an off state, the third power switch MP3 is in an on state, the third path P (3) receives the voltage of the second half period of the ac voltage source VAC to store energy in the second energy storage element L21, and the second current Ich2 flowing through the second energy storage element L21 rises; the second current Ich2 of the third path P (3) flows through the alternating voltage source VAC, the second energy storage element L21, the rectifying tube D41, the first power switch MP1, the detection resistor RCS and the third power switch MP3; the second current Ich2 generates a sense signal VCS across a sense resistor RCS that may be used to provide over-current protection for the first power switch MP1, as well as for generating a load current feedback for stabilizing the output current or voltage VO.
In the fourth operating state, as shown in fig. 1D, the first power switch MP1 is in an off state, the second power switch MP2 is in an off state, the third power switch MP3 is in an on state, the second energy storage element L21 releases energy to the output capacitor CO through the fourth path P (4) to generate the output voltage VO on the output capacitor CO, and the second current Ich2 drops; the second current Ich2 of the fourth path P (4) flows through the ac voltage source VAC, the second energy storage element L21, the rectifying tube D31, the output capacitor CO and the load, and the third power switch MP3.
In the pfc circuit of fig. 1A to 1D, in the first operating state and the second operating state, the first path P (1) and the second path P (2) through which the first current Ich1 flows form the first ac-dc converter 510, and components other than the ac voltage source VAC, where the first ac-dc converter 510 has a boost topology.
In the pfc circuit of fig. 1A to 1D, in the third operating state and the fourth operating state, the third path P (3) and the fourth path P (4) through which the second current Ich2 flows constitute the second ac-dc converter 520, and components other than the ac voltage source VAC, where the second ac-dc converter 520 has a boost topology.
According to the operation principle of the boost converter, the input current peak value Iinpk of the ac voltage source VAC can be calculated by the formula: iinpk=vin/l×ton, where Iinpk represents an input current peak value, vin represents a sinusoidal half-wave dc input voltage, L represents inductance values of the first energy storage element L12 and the second energy storage element L22, where the inductance value L is a constant, and when the second control module 112 controls the on time ton to be constant, the input current peak value Iinpk is in a proportional relationship with the sinusoidal half-wave dc input voltage Vin, so that the input current peak value Iinpk follows the sinusoidal half-wave dc input voltage Vin, thereby obtaining a higher power factor.
In one embodiment, as shown in fig. 1A to 1D, the detection resistor RCS is located on a common path of the first path P (1) and the third path P (3), and is used to detect the first current Ich1 and the second current Ich2 in the on state of the first power switch MP1 and generate the detection signal VCS, and since the first ac-dc converter 510 and the second ac-dc converter 520 are alternately operated in the first half period and the second half period of the ac voltage source VAC, the detection signal VCS is also alternately representative of the first current Ich1 and the second current Ich2.
In one embodiment, as shown in fig. 1A to 1D, the pfc circuit further includes a first control module 111 coupled to the detection signal CS for generating a first control signal GP1 according to the received detection signal CS to drive the first power switch MP1 to be turned on or off.
In one embodiment, the second power switch MP2 and the third power switch MP3 are diodes, and do not affect the current flow direction of the first path P (1) and the third path P (3).
In one embodiment, as shown in fig. 1A to 1D, the power factor correction circuit further includes a control chip, where the control chip integrates the first control module 111, and the control chip controls on or off of the first power switch MP1, the second power switch MP2, and the third power switch MP3 to implement the same phase change of the input voltage and the input current of the ac voltage source VAC, thereby implementing power factor correction.
In an embodiment, as shown in fig. 1A-1D, the pfc circuit further includes a feedback module, the input end of which is coupled to the output voltage VO, and samples the output voltage VO or the output current in a feedback manner, and outputs a feedback signal FB to the first control module 111, and the first control module 111 controls the first power switch MP1 to be turned on or off after comparing the feedback signal FB with a reference voltage, so as to control the output voltage VO or the output current.
Since feedback control is a prior art, the description will not be described in detail.
The present invention also provides a power factor correction circuit coupled to an ac voltage source VAC, an output capacitor CO and a load, as shown in fig. 2A-2D, comprising: the first energy storage element L12 and the second energy storage element L22, wherein the first energy storage element L12 is a main-stage winding of an inductor or a transformer, and the second energy storage element L22 is a main-stage winding of an inductor or a transformer; in the first half cycle of the ac voltage source VAC, in the first operating state, as shown in fig. 2A, the first power switch MP1 is in an on state, the second power switch MP2 is in an on state, the third power switch MP3 is in an off state, the first path P (1) receives the voltage of the first half cycle of the ac voltage source VAC to store energy in the first energy storage element L12, and the first current Ich1 flowing through the first energy storage element L12 rises; the first current Ich1 of the first path P (1) flows through the alternating voltage source VAC, the first energy storage element L12, the rectifying tube D12, the first power switch MP1, the detection resistor RCS and the second power switch MP2; the first current Ich1 generates a sense signal VCS at a sense resistor RCS that may be used to provide over-current protection for the first power switch MP1, as well as for generating a load current feedback for stabilizing the output current or voltage VO.
In the second operating state, as shown in fig. 2B, the first power switch MP1 is in an off state, the second power switch MP2 is in an on state, the third power switch MP3 is in an off state, the first energy storage element L12 releases energy to the output capacitor CO through the second path P (2) to generate the output voltage VO on the output capacitor CO, and the first current Ich1 drops; the first current Ich1 of the second path P (2) flows through the ac voltage source VAC, the first energy storage element L12, the rectifying tube D32, the output capacitor CO and the load, and the second power switch MP2.
In the second half period of the ac voltage source, in the third operating state, as shown in fig. 2C, the first power switch MP1 is in an on state, the second power switch MP2 is in an off state, the third power switch MP3 is in an on state, the third path P (3) receives the voltage of the second half period of the ac voltage source VAC to store energy in the second energy storage element L22, and the second current Ich2 flowing through the second energy storage element L22 rises; the second current Ich2 of the third path P (3) flows through the alternating voltage source VAC, the second energy storage element L22, the rectifying tube D22, the first power switch MP1, the detection resistor RCS and the third power switch MP3; the second current Ich2 generates a sense signal VCS across a sense resistor RCS that may be used to provide over-current protection for the first power switch MP1, as well as for generating a load current feedback for stabilizing the output current or voltage VO.
In the fourth operating state, as shown in fig. 2D, the first power switch MP1 is in an off state, the second power switch MP2 is in an off state, the third power switch MP3 is in an on state, the second energy storage element L22 releases energy to the output capacitor CO through the fourth path P (4) to generate the output voltage VO on the output capacitor CO, and the second current Ich2 drops; the second current Ich2 of the fourth path P (4) flows through the ac voltage source VAC, the second energy storage element L22, the rectifying tube D32, the output capacitor CO and the load, and the third power switch MP3.
In the pfc circuit of fig. 2A to 2D, in the first operating state and the second operating state, the first path P (1) and the second path P (2) through which the first current Ich1 flows, components other than the ac voltage source VAC constitute the first ac-dc converter 510, and the first ac-dc converter 510 has a boost topology.
In the pfc circuit of fig. 2A to 2D, in the third operating state and the fourth operating state, the third path P (3) and the fourth path P (4) through which the second current Ich2 flows constitute the second ac-dc converter 520, and components other than the ac voltage source VAC, where the second ac-dc converter 520 has a boost topology.
According to the operation principle of the boost converter, the input current peak value Iinpk of the ac voltage source VAC can be calculated by the formula: iinpk=vin/l×ton, where Iinpk represents an input current peak value, vin represents a sinusoidal half-wave dc input voltage, L represents inductance values of the first energy storage element L12 and the second energy storage element L22, where the inductance value L is a constant, and when the second control module 112 controls the on time ton to be constant, the input current peak value Iinpk is in a proportional relationship with the sinusoidal half-wave dc input voltage Vin, so that the input current peak value Iinpk follows the sinusoidal half-wave dc input voltage Vin, thereby obtaining a higher power factor.
In one embodiment, as shown in fig. 2A to 2D, the detection resistor RCS is located on a common path of the first path P (1) and the third path P (3), and is used to detect the first current Ich1 and the second current Ich2 in the on state of the first power switch MP1 and generate the detection signal VCS, and since the first ac-dc converter 510 and the second ac-dc converter 520 are alternately operated in the first half period and the second half period of the ac voltage source VAC, the detection signal VCS is also alternately representative of the first current Ich1 and the second current Ich2.
In one embodiment, as shown in fig. 2A-2D, the pfc circuit further includes a second control module 112 coupled to the detection signal CS for generating a first control signal GP1 according to the received detection signal CS to drive the first power switch MP1 to be turned on or off.
In one embodiment, the second power switch MP2 and the third power switch MP3 are diodes, and do not affect the current flow direction of the first path P (1) and the third path P (3).
In one embodiment, as shown in fig. 2A-2D, the power factor correction circuit further includes a control chip,
the control chip integrates a second control module 112, and the control chip realizes the same phase change of the input voltage and the input current of the alternating-current voltage source VAC by controlling the on or off of the first power switch MP1, the second power switch MP2 and the third power switch MP3, thereby realizing the power factor correction.
In one embodiment, as shown in fig. 2A-2D, the pfc circuit further includes a feedback module, the input end of which is coupled to the output voltage VO, and samples the output voltage VO or the output current in a feedback manner, and outputs a feedback signal FB to the second control module 112, and the second control module 112 controls the first power switch MP1 to be turned on or off after comparing the feedback signal FB with a reference voltage, so as to control the output voltage VO or the output current.
Since feedback control is a prior art, the description will not be described in detail.
The invention also provides a power factor correction circuit coupled to an ac voltage source VAC, an output capacitor CO and a load, as shown in fig. 3A-3D, comprising: the first energy storage element L13 and the second energy storage element L23, wherein the first energy storage element L13 is a transformer, and the second energy storage element L23 is a transformer; in the first half cycle of the ac voltage source VAC, in the first operating state, as shown in fig. 3A, the first power switch MP1 is in an on state, the second power switch MP2 is in an on state, the third power switch MP3 is in an off state, the first path P (1) receives the voltage of the first half cycle of the ac voltage source VAC to store energy in the first energy storage element L13, and the first current Ich1 flowing through the first energy storage element L13 rises; the first current Ich1 of the first path P (1) flows through the alternating voltage source VAC, the first energy storage element L13, the rectifying tube D33, the first power switch MP1, the detection resistor RCS and the second power switch MP2; the first current Ich1 generates a sense signal VCS at a sense resistor RCS that may be used to provide over-current protection for the first power switch MP1, as well as for generating a load current feedback for stabilizing the output current or voltage VO.
In the second operating state, as shown in fig. 3B, the first power switch MP1 is in an off state, the second power switch MP2 is in an on state, the third power switch MP3 is in an off state, the first energy storage element L13 discharges energy to the output capacitor CO through the second path P (2) to generate an output voltage VO on the output capacitor CO, the first current Ich1 is coupled from the primary winding of the first energy storage element L13 to the secondary winding of the first energy storage element L13 after the first current Ich1 is transformed by the first energy storage element L13, the first current Ich1 of the secondary winding and the first current Ich1 of the primary winding have a proportional relationship of transformer (ich1_secondary= Nps ×ich1_primary, wherein Nps is the turn ratio of the primary winding and the secondary winding, and the first current Ich1 drops; the first current Ich1 of the second path P (2) flows through the first energy storage element L13, the rectifying tube D13, the output capacitor CO and the load.
In the second half period of the ac voltage source, in the third operating state, as shown in fig. 3C, the first power switch MP1 is in an on state, the second power switch MP2 is in an off state, the third power switch MP3 is in an on state, the third path P (3) receives the voltage of the second half period of the ac voltage source VAC to store energy in the second energy storage element L23, and the second current Ich2 flowing through the second energy storage element L23 rises; the second current Ich2 of the third path P (3) flows through the alternating voltage source VAC, the second energy storage element L23, the rectifying tube D43, the first power switch MP1, the detection resistor RCS and the third power switch MP3; the second current Ich2 generates a sense signal VCS across a sense resistor RCS that may be used to provide over-current protection for the first power switch MP1, as well as for generating a load current feedback for stabilizing the output current or voltage VO.
In the fourth operating state, as shown in fig. 3D, the first power switch MP1 is in an off state, the second power switch MP2 is in an off state, the third power switch MP3 is in an on state, the second energy storage element L23 discharges energy to the output capacitor CO through the fourth path P (4) to generate the output voltage VO on the output capacitor CO, the second current Ich2 is converted by the second energy storage element L23, the second current Ich2 is coupled from the primary winding of the second energy storage element L23 to the secondary winding of the second energy storage element L23, the second current Ich2 of the secondary winding and the second current Ich2 of the primary winding have a turn ratio relationship (ich2_secondary= Nps ×ich2_primary of the transformer, wherein Nps is the turn ratio of the primary winding and the secondary winding), and the second current Ich2 drops; the second current Ich2 of the fourth path P (4) flows through the second energy storage element L23, the rectifying tube D23, the output capacitance CO, and the load.
In the pfc circuit of fig. 3A to 3D, in the first operating state and the second operating state, the first path P (1) and the second path P (2) through which the first current Ich1 flows, components other than the ac voltage source VAC form the first ac-dc converter 510, and the first ac-dc converter 510 is in a flyback topology.
In the pfc circuit of fig. 3A to 3D, in the third operating state and the fourth operating state, the third path P (3) and the fourth path P (4) through which the second current Ich2 flows form the second ac-dc converter 520, and components other than the ac voltage source VAC, where the second ac-dc converter 520 has a flyback topology.
According to the operating principle of the flyback converter, the input current peak value Iinpk of the ac voltage source VAC can be calculated by the formula: iinpk=vin/l×ton, where Iinpk represents an input current peak value, vin represents a sinusoidal half-wave dc input voltage, L represents a primary winding inductance value of the first energy storage element L13 and a primary winding inductance value of the second energy storage element L23, where the inductance value L is a constant, and when the third control module 113 controls the on time ton to be constant, the input current peak value Iinpk is in a proportional relationship with the sinusoidal half-wave dc input voltage Vin, so that it is achieved that the input current peak value Iinpk follows the sinusoidal half-wave dc input voltage Vin, thereby obtaining a higher power factor.
In one embodiment, as shown in fig. 3A to 3D, the detection resistor RCS is located on a common path of the first path P (1) and the third path P (3), and is used to detect the first current Ich1 and the second current Ich2 in the on state of the first power switch MP1 and generate the detection signal VCS, and since the first ac-dc converter 510 and the second ac-dc converter 520 are alternately operated in the first half period and the second half period of the ac voltage source VAC, the detection signal VCS is also alternately representative of the first current Ich1 and the second current Ich2.
In one embodiment, as shown in fig. 3A-3D, the pfc circuit further includes a third control module 113 coupled to the detection signal CS for generating a first control signal GP1 according to the received detection signal CS to drive the first power switch MP1 to be turned on or off.
In one embodiment, the second power switch MP2 and the third power switch MP3 are diodes, and do not affect the current flow direction of the first path P (1) and the third path P (3).
In one embodiment, as shown in fig. 3A to 3D, the pfc circuit further includes a control chip, and the control chip integrates a third control module 113, and the control chip controls on or off of the first power switch MP1, the second power switch MP2, and the third power switch MP3 to implement the in-phase change of the input voltage and the input current of the ac voltage source VAC, thereby implementing the pfc.
In one embodiment, as shown in fig. 3A-3D, the pfc circuit further includes a feedback module, the input end of which is coupled to the output voltage VO, samples the output voltage VO or the output current in a feedback manner, outputs a feedback signal FB to the third control module 113, and the third control module 113 controls the first power switch MP1 to be turned on or off after comparing the feedback signal FB with a reference voltage, so as to control the output voltage VO or the output current.
In one embodiment, as shown in fig. 4, the working principle of the embodiment of fig. 4 is the same as that of the embodiment of fig. 3A-3D, and the two are different from each other in positions of the rectifying tube D33 and the rectifying tube D43, but the functions of the two are the same, so the description will not be described in detail.
Since feedback control is a prior art, the description will not be described in detail.
As can be seen from the above embodiments, the first ac-dc converter 510 and the second ac-dc converter 520 included in the pfc circuit are both of a boost topology or a flyback topology.
Third aspect of the invention
An embodiment of the present invention provides an electronic device, including a power factor corrector or a power factor correction circuit as described in any one of the first aspect and the second aspect.
The technology of the invention has the following advantages:
according to the power factor corrector, the power factor correction circuit and the electronic equipment, a rectifier bridge coupled with an alternating voltage source is omitted, and efficiency and performance are improved.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. It should also be noted that, in this document, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Moreover, relational terms such as "first" and "second" may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions, or order, and without necessarily being construed as indicating or implying any relative importance. "and/or" means either or both of which may be selected. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device comprising the element.
The foregoing has outlined rather broadly the more detailed description of the invention in order that the detailed description of the invention that follows may be better understood, and in order that the present contribution to the art may be better appreciated. While various modifications of the embodiments and applications of the invention will occur to those skilled in the art, it is not necessary and not intended to be exhaustive of all embodiments, and obvious modifications or variations of the invention are within the scope of the invention.

Claims (10)

1. A power factor corrector coupled to an ac voltage source, an output capacitor and a load, comprising:
the input end of the first alternating current-direct current converter receives a first end of the alternating current voltage source as an input voltage anode, a second end of the alternating current voltage source as an input voltage cathode, and the output end of the first alternating current-direct current converter is coupled with the output capacitor and the load;
the input end of the second alternating current-direct current converter receives the second end of the alternating current voltage source as an input voltage anode, the first end of the alternating current voltage source as an input voltage cathode, and the output end of the second alternating current-direct current converter is coupled with the output capacitor and the load;
The first AC-DC converter and the second AC-DC converter share a first power switch;
the first AC-DC converter works in a first half period of the AC voltage source, and does not work in a second half period; the second AC-DC converter operates in a second half period of the AC voltage source, and does not operate in the first half period; the power factor corrector realizes the same phase change of the voltage and the current of an alternating current voltage source through the alternating operation of the first alternating current-direct current converter and the second alternating current-direct current converter, thereby realizing the power factor correction.
2. The power factor corrector as set forth in claim 1, wherein,
the first alternating current-direct current converter comprises a first energy storage element, a first rectifying module, a first power switch and a second power switch;
the first end of the first energy storage element is coupled with the first end of the alternating voltage source, the second end of the first energy storage element is coupled with the first end of the first power switch, the second end of the first energy storage element is coupled with the output capacitor after passing through the first rectifying module, the output capacitor generates output voltage, and the second power switch is coupled between the second end of the first power switch and the second end of the alternating voltage source; or (b)
The first end of the first energy storage element is coupled with the first end of the alternating current voltage source, the second end of the first energy storage element is coupled with the first end of the first power switch, the third end of the first energy storage element is coupled with the positive plate of the output capacitor after passing through the first rectifying module, the fourth end of the first energy storage element is coupled with the negative plate of the output capacitor, the output capacitor generates output voltage, and the second power switch is coupled between the second end of the first power switch and the second end of the alternating current voltage source;
the second alternating current-direct current converter comprises a second energy storage element, a second rectifying module, a first power switch and a third power switch;
the first end of the second energy storage element is coupled with the second end of the alternating current voltage source, the second end of the second energy storage element is coupled with the first end of the first power switch, the second end of the second energy storage element is coupled with the output capacitor after passing through the second rectifying module, the output capacitor generates output voltage, and the third power switch is coupled between the second end of the first power switch and the first end of the alternating current voltage source; or (b)
The first end of the second energy storage element is coupled with the second end of the alternating current voltage source, the second end of the second energy storage element is coupled with the first end of the first power switch, the third end of the second energy storage element is coupled with the positive plate of the output capacitor after passing through the second rectifying module, the fourth end of the second energy storage element is coupled with the negative plate of the output capacitor, the output voltage is generated on the output capacitor, and the third power switch is coupled between the second end of the first power switch and the first end of the alternating current voltage source.
3. The power factor corrector as set forth in claim 2, wherein,
the first rectifying module and the second rectifying module are diodes, or the first rectifying module and the second rectifying module are metal oxide semiconductor field effect transistors;
the power factor corrector further comprises a control module and a detection resistor, wherein the detection resistor is positioned between the second end of the first power switch and the second ends of the second power switch and the third power switch and is used for detecting the current flowing through the first power switch and generating a detection signal, and the control module is coupled with the detection signal and controls the on and off of the first power switch according to the detection signal.
4. A power factor correction circuit coupled to an ac voltage source, an output capacitor, and a load, comprising: the energy storage device comprises a first energy storage element and a second energy storage element, wherein the first energy storage element is an inductor or a transformer, and the second energy storage element is an inductor or a transformer;
in a first half period of an alternating current voltage source, in a first working state, a first path receives voltage of the first half period of the alternating current voltage source to store energy of the first energy storage element, and first current flowing through the first energy storage element rises; in a second operating state, the first energy storage element releases energy to the output capacitor through a second path to generate an output voltage on the output capacitor, and the first current drops; in a second half period of the alternating current voltage source, in a third working state, the third path receives the voltage of the second half period of the alternating current voltage source to store energy of the second energy storage element, and the second current flowing through the second energy storage element rises; in a fourth operating state, the second energy storage element releases energy to the output capacitor through a fourth path to generate the output voltage on the output capacitor, and the second current drops.
5. The power factor correction circuit of claim 4, wherein the power factor correction circuit comprises a first power switch, a second power switch, and a third power switch;
in a first working state of a first half cycle of the alternating-current voltage source, the first current flows through the alternating-current voltage source, the first energy storage element, the first rectifying module, the first power switch and the second power switch;
in a second working state of a first half period of the alternating current voltage source, the first current flows through the first energy storage element, the first rectifying module, the output capacitor and the load;
in a third working state of a second half period of the alternating voltage source, the second current flows through the alternating voltage source, the second energy storage element, the second rectifying module, the first power switch and the third power switch;
in a fourth operating state of the second half-cycle of the alternating voltage source, the second current flows through the second energy storage element, the second rectifying module, the output capacitor and the load.
6. The power factor correction circuit of claim 5, wherein,
in the first working state and the second working state, the first path and the second path through which the first current flows, and components except an alternating current voltage source form a first alternating current-direct current converter;
In the third working state and the fourth working state, the third path and the fourth path through which the second current flows, and components except an alternating current voltage source form a second alternating current-direct current converter;
the first AC-DC converter and the second AC-DC converter are both of a boost topology or a flyback topology.
7. The power factor correction circuit of claim 5, further comprising:
the detection resistor is positioned on a common path of the first path and the third path and is used for detecting the first current and the second current and generating a detection signal;
the control module is coupled with the detection signal and used for generating a first control signal according to the received detection signal to drive the first power switch to be turned on or turned off.
8. The power factor correction circuit of claim 7, wherein,
the power factor correction circuit further comprises a control chip, the control chip is integrated with the control module, and the control chip realizes the same phase change of the input voltage and the input current of the alternating-current voltage source by controlling the on or off of the first power switch, the second power switch and the third power switch, so as to realize the power factor correction.
9. The power factor corrector as claimed in claim 2, or the power factor correction circuit of claim 5, wherein the second and third power switches are partly or wholly diodes.
10. Electronic equipment characterized by comprising a power factor corrector according to any of claims 1-3, 9 or a power factor correction circuit according to any of claims 4-9.
CN202310714983.4A 2023-05-31 2023-06-15 Power factor corrector, power factor correction circuit and electronic equipment Pending CN116780885A (en)

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CN2023106417474 2023-05-31
CN202310641747 2023-05-31

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116961437A (en) * 2023-09-20 2023-10-27 恩赛半导体(成都)有限公司 Power supply circuit, power supply system and power supply equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116961437A (en) * 2023-09-20 2023-10-27 恩赛半导体(成都)有限公司 Power supply circuit, power supply system and power supply equipment

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