CN112087129B - Power factor correction circuit and correction method thereof - Google Patents

Power factor correction circuit and correction method thereof Download PDF

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Publication number
CN112087129B
CN112087129B CN202010947681.8A CN202010947681A CN112087129B CN 112087129 B CN112087129 B CN 112087129B CN 202010947681 A CN202010947681 A CN 202010947681A CN 112087129 B CN112087129 B CN 112087129B
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circuit
correction circuit
power factor
compensation
thd
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CN112087129A (en
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何垒
宁思捷
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Mornsun Guangzhou Science and Technology Ltd
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Mornsun Guangzhou Science and Technology Ltd
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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
    • H02M1/4208—Arrangements for improving power factor of AC input
    • 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
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention provides a power factor correction circuit, which comprises a THD correction circuit, wherein the THD correction circuit comprises a compensation voltage source generation circuit and a compensation current limiting circuit, a first input end of the THD correction circuit is used for connecting a first input signal, a second input end of the THD correction circuit is used for connecting an output end of a peak current detection unit of the power factor correction circuit, and an output end of the THD correction circuit is used for connecting a logic circuit of the power factor correction circuit. The compensation voltage source generating circuit is used for generating a negative compensation voltage source to be supplied to the compensation current limiting circuit, and the compensation current limiting circuit is used for limiting the size of the compensation current. The invention increases the minimum value of the inductive current of the power factor correction circuit through the compensating current, reduces the distortion influence of the negative current on the input current in the power factor correction circuit, and can obviously reduce the THD value of the power factor correction circuit.

Description

Power factor correction circuit and correction method thereof
Technical Field
The invention relates to the field of power factor correction circuits, in particular to a THD correction circuit and a correction method thereof.
Background
With the rapid development of modern industry, the nonlinear load of the power system is increasing. Harmonic currents generated by these nonlinear loads are injected into the grid, so that the voltage waveform of the utility grid is distorted, the environment of the grid is seriously polluted, and Power Factor Correction (PFC) is performed to reduce and eliminate the harmonic waves, so that the input current close to a sine wave and the power factor close to 1 are obtained.
Fig. 1 shows a conventional bridged PFC circuit, and fig. 2 shows a totem-pole bridgeless PFC circuit. Compared with the traditional bridge PFC circuit, the totem-pole bridgeless PFC circuit reduces the loss of an input end rectifier bridge stack, and can realize Zero Voltage Switching (ZVS) under specific control, so that the research of the totem-pole bridgeless PFC circuit is increasingly emphasized.
Fig. 3 shows a totem-pole bridgeless PFC power supply system in the prior art (fig. 3 is a practical application block diagram of a totem-pole bridgeless PFC circuit, which realizes a power factor correction function, and may also be called a power factor correction circuit in the drawing, and fig. 5 and 6 are the same), and the power supply system includes a totem-pole bridgeless PFC power topology unit 100 (because circuit modules are crossed, the totem-pole bridgeless PFC power topology unit 100 cannot be circled out, and the totem-pole bridgeless PFC power topology unit 100 in fig. 3, 5 and 6 has the same circuit structure as that shown in fig. 2), a peak current detection unit 101, an input voltage sampling unit 102, a negative current detection unit 103, a logic control unit 104, a driving circuit unit 105, and an output voltage sampling and compensation network unit 106.
Taking the positive half cycle of the sinusoidally alternating voltage as an example (taking the L-line voltage higher than the N-line voltage as the positive half cycle), the working process of the power supply system is as follows:
the input voltage sampling unit 102 samples an input voltage of an AC power supply and outputs a Vac signal to the logic control unit 104, and the logic control unit 104 determines that the AC power supply is in a positive half cycle according to the Vac signal and outputs a Pos signal and a Neg signal (normally, the Pos signal is high and the Neg signal is low in the positive half cycle, and the Pos signal is low and the Neg signal is high in the negative half cycle). The signal selection circuit in the peak current detection unit 101 is controlled by Pos signal, so that the peak current detection terminal is connected with the secondary terminal of the current transformer TA2 for detecting the forward peak current of the inductor.
When the Q2 transistor is turned on, the inductor current rises, and the secondary of the current transformer TA2 generates a Vcs voltage signal proportional to the inductor current on the sampling resistor Rsense until the Vcs voltage signal reaches the internal calculation value of the logic control unit 104, at this time, a turn-off signal of the Q2 transistor is output, and the Q2 transistor is turned off after passing through the driving circuit 105. The internal calculation value of the logic control unit 104 is related to the Vac signal input to the voltage sampling unit 102 and the output Vcomp signal of the output voltage sampling and compensation network unit 106.
The Q2 transistor is turned off, and the Q1 transistor is turned on after the dead time, the inductor current decreases until the negative current detection unit 103 detects that the inductor current reaches a set negative current value (e.g., -2A), at this time, the output signal Vncd of the negative current detection unit 103 is processed by the logic control unit 104, and then the turn-off signal of the Q1 transistor is output, and the Q1 transistor is turned off after the output signal passes through the driving circuit unit 105. After the Q1 tube is turned off, the inductor L1 resonates with the parasitic junction capacitors of the Q1 tube and the Q2 tube until the drain-source voltage of the Q2 tube is reduced to zero, and the Q2 tube is turned on to realize ZVS.
The presence of the inductive negative current facilitates ZVS over a wide input voltage range, increasing the efficiency of the converter, but the presence of the negative current will have an effect on the input current, as shown in fig. 4. The input current Distortion is serious, which affects the Total Harmonic Distortion (THD) of the circuit, and is not favorable for obtaining a lower THD value.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the power factor correction circuit and the correction method thereof, which are realized by the THD correction circuit and the correction method thereof, can increase the current minimum value of the inductor of the power factor correction circuit, reduce the influence of negative current on the distortion of input current and are beneficial to obtaining a lower THD value.
The invention relates to a power factor correction circuit, which comprises a THD correction circuit, wherein the THD correction circuit comprises a compensation voltage source generating circuit and a compensation current limiting circuit, a first input end of the THD correction circuit is used for accessing a first input signal, a second input end of the THD correction circuit is used for connecting an output end of a peak current detection unit of the power factor correction circuit, an output end of the THD correction circuit is used for connecting a logic circuit of the power factor correction circuit, an output end of the compensation voltage source generating circuit is connected with an input end of the compensation current limiting circuit, the compensation voltage source generating circuit is used for generating a negative compensation voltage source, and the compensation current limiting circuit is used for limiting the size of compensation current; the THD correction circuit increases the minimum value of the inductive current of the power factor correction circuit through the compensation current, and reduces the influence of the inductive negative current in the power factor correction circuit on the distortion of the input current.
Preferably, the first input terminal of the THD correction circuit is used for connecting with a driving signal terminal of the power factor correction circuit or an auxiliary winding terminal of an inductor of the power factor correction circuit, and the first input signal is a pulse width signal with high and low levels.
One specific embodiment of the compensating voltage source generating circuit includes a first capacitor C1, a third diode D3, a fourth diode D4, and a second capacitor C2, wherein one end of the first capacitor C1 is used as a first input terminal of the THD correction circuit, the other end of the first capacitor C1 is connected to an anode of the third diode D3 and a cathode of the fourth diode D4, an anode of the fourth diode D4 is connected to one end of the second capacitor C2 and is used as a port connected to the compensating current limiting circuit, and a cathode of the third diode D3 and the other end of the second capacitor C2 are connected to the voltage reference terminal GND.
One embodiment of the compensation current limiting circuit comprises a first resistor R1 and a second resistor R2, wherein one end of the first resistor R1 serves as a second input end of the THD correction circuit; the other end of the first resistor R1 is connected with one end of the second resistor R2 and is used as the output end of the THD correction circuit; the other end of the second resistor R2 is used as a port for connecting to a compensation voltage source generating circuit.
Preferably, the filter circuit can be further included, one end of the filter circuit is connected to the output end of the THD correction circuit, and the other end of the filter circuit is connected to the voltage reference end GND, so as to avoid the influence of high-frequency noise on the signal output by the output end of the THD correction circuit.
The filter circuit comprises a third capacitor C3, one end of the third capacitor C3 is one end of the filter circuit, and the other end of the third capacitor C3 is the other end of the filter circuit.
Preferably, the voltage regulator further comprises a compensation voltage adjusting circuit, one end of the compensation voltage adjusting circuit is used as a first input end of the THD correction circuit, and the other end of the compensation voltage adjusting circuit is connected with the compensation voltage source generating circuit and used for dynamically adjusting the amplitude of the output voltage of the compensation voltage source generating circuit.
The compensation voltage adjusting circuit comprises a fifth diode D5, a sixth diode D6, a third resistor R3 and a fourth resistor R4, wherein the anode of the fifth diode D5 is connected with the cathode of the sixth diode D6 and serves as a first input end of the THD correction circuit, the cathode of the fifth diode D5 is connected with one end of the third resistor R3, the anode of the sixth diode D6 is connected with one end of the fourth resistor R4, and the other end of the third resistor R3 is connected with the other end of the fourth resistor R4 and is connected with a compensation voltage source generating circuit.
The invention also provides a power factor correction method, which is realized by the THD correction method and comprises a compensation voltage source generation step and a compensation current limiting step; a compensation voltage source generating step: providing a negative compensation voltage source for the compensation current limiting circuit; a compensation current limiting step: generating a compensation current by using a negative compensation voltage source, and limiting the magnitude of the compensation current; the THD correction circuit increases the minimum value of the inductive current of the power factor correction circuit through the compensation current, and reduces the influence of the inductive negative current in the power factor correction circuit on the distortion of the input current.
Interpretation of terms:
output terminal of peak current detection unit: as shown in fig. 3, one end of the sampling resistor Rsense connected to the signal selection unit is an output end of the peak current detection unit.
Compared with the prior art, the adjustable compensation current is generated by additionally arranging the compensation voltage source generating circuit and the compensation current limiting circuit, and the compensation current flows through the sampling resistor Rsense of the peak current detection unit in the power factor correction circuit, so that the minimum value of the inductive current of the power factor correction circuit is increased, the influence of the negative current in the power factor correction circuit on the distortion of the input current is reduced, and the THD value is reduced.
Drawings
Fig. 1 is a diagram of a conventional bridged PFC circuit;
fig. 2 is a circuit diagram of a totem-pole bridgeless PFC;
fig. 3 is a block diagram of a conventional power supply system using a totem-pole bridgeless PFC circuit;
fig. 4 is a diagram of an input current waveform and an inductor current waveform of a conventional power supply system using a totem-pole bridgeless PFC circuit;
FIG. 5 is a first practical block diagram of the PFC circuit of the present invention;
FIG. 6 is a second practical block diagram of the PFC circuit of the present invention;
FIG. 7 is a schematic circuit diagram of a portion of a power factor correction circuit according to a first embodiment of the present invention;
FIG. 8 is a diagram illustrating an input current waveform and an inductor current waveform of the PFC circuit according to the first embodiment of the present invention;
fig. 9 is a schematic circuit diagram of a part of a power factor correction circuit according to a second embodiment of the present invention.
Detailed Description
Example one
Fig. 7 is a schematic diagram of a part of a power factor correction circuit according to an embodiment of the present invention.
A power factor correction circuit comprises a THD correction circuit, wherein the THD correction circuit comprises a compensation voltage source generation circuit 201 and a compensation current limiting circuit 202.
The compensation voltage source generating circuit 201 is used for generating a compensation voltage source with a negative direction, and includes a first capacitor C1, a third diode D3, a fourth diode D4, and a second capacitor C2. One end of the first capacitor C1 is used as a first input end of the THD correction circuit, the other end of the first capacitor C1 is connected to an anode of the third diode D3 and a cathode of the fourth diode D4, an anode of the fourth diode D4 is used as a port connected to the compensation current limiting circuit 202 and is connected to one end of the second capacitor C2, and a cathode of the third diode D3 and the other end of the second capacitor C2 are connected to the voltage reference terminal GND.
The THD correction circuit has a first input terminal connected to a pulse width signal having a high and low level signal, and an input signal Vpwm, and the first input terminal may be connected to a driving signal terminal or one terminal of an auxiliary winding of an inductor.
When the input signal is at a high level and has a voltage amplitude of V1, the input signal charges the first capacitor C1 through the first capacitor C1 and the third diode D3, so that a potential difference between the left end and the right end is generated across the first capacitor C1, and the amplitude of the potential difference is V1.
When an input signal is at a low level, the voltage amplitude is V2, and V2 is greater than V1, because the potential difference between the two ends of the capacitor cannot change suddenly, the potential on the left side of the first capacitor C1 changes along with the input signal, the potential on the right side of the first capacitor C1 drops, the potential is V2-V1, because V2 is greater than V1, the potential on the right side of the first capacitor C1 is smaller than zero, the third diode D3 is turned off, the fourth diode D4 is turned on, the first capacitor C1 discharges through the second capacitor C2 and the fourth diode D4, the second capacitor C2 generates a potential difference which is positive, negative and positive, and the amplitude is V2-V1. Since V2 < V1 and the lower end of the second capacitor C2 is connected to the voltage reference terminal GND, the upper end of the second capacitor C2 has a negative potential ranging from V2 to V1.
The compensation current limiting circuit 202 is used for limiting the magnitude of the compensation current value and comprises a first resistor R1 and a second resistor R2. One end of the first resistor R1 is used as a second input end of the THD correction circuit and is connected to the output end of the peak current detection unit 101, and the output end of the peak current detection unit 101 is the end of the sampling resistor Rsense connected to the signal selection unit; the other end of the first resistor R1 is connected with one end of the second resistor R2, and is used as the output end of the THD correction circuit, and the output signal is Vcs; the other end of the second resistor R2 serves as a port to which the offset voltage source generating circuit 202 is connected.
The second capacitor C2 generates a compensation current Ic through the sampling resistor Rsense, the first resistor R1 and the second resistor R2, and the magnitude of the compensation current Ic satisfies:
Ic＝|V2-V1|/(R1+R2+Rsense)
the direction of the compensation current Ic flowing through the sampling resistor Rsense is from bottom to top, and the direction of the compensation current Ic flowing through the first resistor R1 and the second resistor R2 is from right to left. In order to maintain the stability of the potential difference across the third capacitor C3, the design value of the compensation current Ic is usually small.
The sampling resistor Rsense samples the peak current of a switching tube in the totem-pole bridgeless PFC, the peak current Is subjected to proportional conversion by a current transformer TA2, the size of the current flowing through the sampling resistor Rsense Is, and Is far larger than Ic. Therefore, the current flowing through the sampling resistor Rsense Is approximately equal to Is, and the direction Is from top to bottom. After the current compensation is carried out by the THD correction circuit, the output signal Vcs meets the following requirements:
Vcs＝Is*Rsense-Ic*R1
normally, the value of Vcs is determined by the Vac signal input to the voltage sampling unit 102 and the output signal Vcomp output from the voltage sampling and compensating unit 106. The secondary current flowing through the current transformer has the same value as the current flowing through the sampling resistor Rsense, and Is satisfied as follows:
Is＝Vcs/Rsense+Ic*R1/Rsense
through the THD correction circuit, under the same Vcs condition, the secondary current flowing through the current transformer Is increased, the increased value Is Ic R1/Rsense, and the peak current of the switch tube and the peak current of the inductor are both proportional to the magnitude of Is, so that the THD correction circuit increases the minimum value of the inductor current, and reduces the input current distortion caused by the negative current of the inductor, particularly the distortion near the zero crossing of the alternating-current input voltage.
After compensation by the THD correction circuit, the input current and inductive current waveforms of the power factor correction circuit are shown in FIG. 8, and the THD value comparison of the prior art and the invention is shown in Table I.
Table one:
input voltage Output power THD value of the prior art THD value of the invention
115VAC 500W 5.71％ 3.39％
230VAC 500W 7.84％ 4.89％
115VAC 120W 13.01％ 4.83％
230VAC 120W 21.16％ 5.60％
As can be seen from the table I, the THD value of the invention is reduced by 2-4 times compared with the prior art, and the THD distortion value fluctuates smoothly, thus being obviously improved.
In order to avoid the influence of high-frequency noise on a signal output by the output end of the THD correction circuit in the working process and improve the working stability of a system, a filter circuit 203 is added, a third capacitor C3 is usually connected in parallel, one end of a third capacitor C3 is connected with the output end of the THD correction circuit, and the other end of the third capacitor C3 is connected with a reference voltage end GND.
This embodiment is applied to actual production, and may be applied in the manner shown in fig. 5 or in the manner shown in fig. 6.
Example two
FIG. 9 shows a second embodiment of the present invention.
The main differences from the first embodiment are as follows: a compensation voltage adjusting circuit 204 is added and connected in series between the first input signal and the compensation voltage source generating circuit 201 for adjusting the amplitude of the output voltage of the compensation voltage source generating circuit 201. The compensation voltage adjustment circuit 204 includes a fifth diode D5, a sixth diode D6, a third resistor R3, and a fourth resistor R4.
Wherein the anode of the fifth diode D5 is connected to the cathode of the sixth diode D6 as a new first input terminal of the THD correction circuit, and is connected to a pulse width signal having a high/low level signal, whose input signal is Vpwm, and the first input terminal can be connected to a driving signal terminal or one terminal of an auxiliary winding of an inductor; the cathode of the fifth diode D5 is connected to one end of the third resistor R3, the anode of the sixth diode D6 is connected to one end of the fourth resistor R4, and the other end of the third resistor R3 is connected to the other end of the fourth resistor R4 and to one end of the first capacitor C1.
When the input signal is at a high level, the input signal charges the first capacitor C1 through a loop of the fifth diode D5, the third resistor R3, the first capacitor C1 and the third diode D3, and the magnitude of the charging current is adjusted through the third resistor R3; when the input signal is at a low level, the first capacitor C1 discharges the first capacitor C1 through the loop of the fourth resistor R4, the sixth diode D6, the second capacitor C2 and the fourth diode D4, and the magnitude of the discharge current is adjusted through the fourth resistor R4. By adjusting the magnitude of the charging and discharging currents, the compensation voltage source generating circuit 201 generates different compensation voltages under different input voltages and different duty ratios, so as to generate different compensation currents, and finally, a better compensation effect can be obtained under different input voltages, which is beneficial to maintaining a lower THD value under a wide input voltage range.
The above disclosure is only a preferred embodiment of the present invention, but the present invention is not limited thereto, and those skilled in the art should make modifications to the present invention without departing from the core idea of the present invention, and fall within the protection scope of the claims of the present invention.

Claims (9)

1. A power factor correction circuit, characterized by: the THD correction circuit comprises a compensation voltage source generating circuit and a compensation current limiting circuit, wherein a first input end of the THD correction circuit is used for being connected with a first input signal, a second input end of the THD correction circuit is used for being connected with an output end of a peak current detection unit of the power factor correction circuit, an output end of the THD correction circuit is used for being connected with a logic circuit of the power factor correction circuit, the compensation voltage source generating circuit is used for generating a negative compensation voltage source to be supplied to the compensation current limiting circuit, and the compensation current limiting circuit is used for generating compensation current by using the negative compensation voltage source and limiting the size of the compensation current; the THD correction circuit increases the minimum value of the inductive current of the power factor correction circuit through the compensation current, and reduces the influence of the inductive negative current in the power factor correction circuit on the distortion of the input current.
2. The power factor correction circuit of claim 1, wherein: the first input end of the THD correction circuit is used for being connected with a driving signal end of the power factor correction circuit or one end of an auxiliary winding of an inductor of the power factor correction circuit, and the first input signal is a pulse width signal with high and low levels.
3. The power factor correction circuit of claim 1, wherein: the compensation voltage source generating circuit comprises a first capacitor C1, a third diode D3, a fourth diode D4 and a second capacitor C2, wherein one end of the first capacitor C1 is used as a first input end of the THD correction circuit, the other end of the first capacitor C1 is connected with an anode of the third diode D3 and a cathode of the fourth diode D4, an anode of the fourth diode D4 is connected with one end of the second capacitor C2 and is used as a port connected with the compensation current limiting circuit, and a cathode of the third diode D3 and the other end of the second capacitor C2 are connected with a voltage reference terminal GND.
4. The power factor correction circuit of claim 1, wherein: the compensation current limiting circuit comprises a first resistor R1 and a second resistor R2, wherein one end of the first resistor R1 serves as a second input end of the THD correction circuit; the other end of the first resistor R1 is connected with one end of the second resistor R2 and is used as the output end of the THD correction circuit; the other end of the second resistor R2 is used as a port for connecting to a compensation voltage source generating circuit.
5. The power factor correction circuit of claim 1, wherein: the filter circuit is characterized by further comprising a filter circuit, wherein one end of the filter circuit is connected with the output end of the THD correction circuit, and the other end of the filter circuit is connected with a voltage reference end GND (ground) for avoiding the influence of high-frequency noise on an output signal of the output end of the THD correction circuit.
6. The power factor correction circuit of claim 5, wherein: the filter circuit comprises a third capacitor C3, one end of the third capacitor C3 is one end of the filter circuit, and the other end of the third capacitor C3 is the other end of the filter circuit.
7. The power factor correction circuit of claim 1, wherein: one end of the compensation voltage adjusting circuit is used as a first input end of the THD correction circuit, and the other end of the compensation voltage adjusting circuit is connected with the compensation voltage source generating circuit and used for dynamically adjusting the output voltage amplitude of the compensation voltage source generating circuit.
8. The power factor correction circuit of claim 7, wherein: the compensation voltage adjusting circuit comprises a fifth diode D5, a sixth diode D6, a third resistor R3 and a fourth resistor R4, wherein the anode of the fifth diode D5 is connected with the cathode of the sixth diode D6 and serves as a first input end of the THD correction circuit, the cathode of the fifth diode D5 is connected with one end of the third resistor R3, the anode of the sixth diode D6 is connected with one end of the fourth resistor R4, and the other end of the third resistor R3 is connected with the other end of the fourth resistor R4 and is connected with a compensation voltage source generating circuit.
9. A power factor correction method is realized by a THD correction method, and is characterized in that: comprises a compensation voltage source generating step and a compensation current limiting step;
a compensation voltage source generating step: providing a negative compensation voltage source for the compensation current limiting circuit;
a compensation current limiting step: generating a compensation current by using a negative compensation voltage source, and limiting the magnitude of the compensation current;
the THD correction circuit increases the minimum value of the inductive current of the power factor correction circuit through the compensation current, and reduces the influence of the inductive negative current in the power factor correction circuit on the distortion of the input current.
CN202010947681.8A 2020-09-10 2020-09-10 Power factor correction circuit and correction method thereof Active CN112087129B (en)

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CN103178704B (en) * 2011-12-20 2015-10-21 英飞特电子（杭州）股份有限公司 A kind of power factor compensation circuit being applicable to peak value comparison method
CN102611296B (en) * 2012-03-13 2014-09-03 华为技术有限公司 Switch switching-off triggering circuit and power factor correction circuit
CN102843039B (en) * 2012-09-18 2014-11-26 英飞特电子（杭州）股份有限公司 Control circuit and constant current source circuit with same

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