CN107104589B - PFC circuit and variable frequency air conditioner - Google Patents

PFC circuit and variable frequency air conditioner Download PDF

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Publication number
CN107104589B
CN107104589B CN201710531630.5A CN201710531630A CN107104589B CN 107104589 B CN107104589 B CN 107104589B CN 201710531630 A CN201710531630 A CN 201710531630A CN 107104589 B CN107104589 B CN 107104589B
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module
capacitor
diode
igbt
rectification
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CN107104589A (en
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鲍殿生
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GD Midea Air Conditioning Equipment Co Ltd
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GD Midea Air Conditioning Equipment Co 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
    • H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
    • 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
    • H02M1/4283—Arrangements for improving power factor of AC input by adding a controlled rectifier in parallel to a first rectifier feeding a smoothing capacitor
    • 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 PFC circuit and a variable frequency air conditioner.A rectifier module is formed by connecting two branches in parallel, wherein the two branches comprise a diode and an IGBT (insulated gate bipolar transistor) tube with a freewheeling diode, the reactor is connected with the input end of an alternating current power supply, the reactor and the rectifier module are connected in series in an alternating current power supply loop, a first capacitor and a second capacitor are connected in series and then connected in parallel at the output end of the rectifier module, and the common junction of the first capacitor and the second capacitor is connected with the alternating current loop. When the PFC circuit works, a current loop of the PFC circuit only passes through one diode or a freewheeling diode of one IGBT tube, and compared with the prior art which needs to pass through each diode of two rectifier bridge stacks, the working quantity of the diodes is greatly reduced, so that the heating loss of the whole PFC circuit is reduced, and the energy waste is reduced.

Description

PFC circuit and variable frequency air conditioner
Technical Field
The invention relates to the field of PFC control, in particular to a PFC circuit and a variable frequency air conditioner.
Background
The conventional PFC (Power Factor Correction) circuit for driving a variable frequency compressor or a direct current motor under low voltage such as 100VAC (variable frequency Power supply) Power supply voltage generally adopts voltage-multiplying rectification and then outputs Power supply, the PFC circuit of the conventional voltage-multiplying rectification scheme comprises two rectifier bridge stacks, one of the two rectifier bridge stacks is used for voltage-multiplying rectification, and the other rectifier bridge stack is used for supplying Power to a PFC part after full-wave rectification, in the working process of the whole PFC circuit, each diode of the two bridge stacks has 8 total diodes which need to work, and the two bridge stacks generate heat greatly due to the large working current of the PFC circuit, so that great energy waste is caused.
Disclosure of Invention
The invention mainly aims to provide a PFC circuit and a variable frequency air conditioner, and aims to solve the problem that a bridge stack of the PFC circuit in the conventional voltage-multiplying rectification mode generates large heat.
In order to achieve the above object, the present invention provides a PFC circuit, which includes a reactor, a rectifier module, a first capacitor, a second capacitor, a controller, and a driving module;
the reactor is connected with the input end of the alternating current power supply, and the reactor and the rectifying module are connected in series in an alternating current power supply loop;
the first capacitor and the second capacitor are connected in series and then connected in parallel at the output end of the rectifying module,
the driving module is connected with the output end of the rectifying module in parallel, the rectifying module rectifies input alternating current into direct current to provide a power supply for the driving module to work, the control end of the driving module is connected with the controller, and the controller controls the driving module to drive a load to operate;
the rectification module comprises a first rectification unit and a second rectification unit, the first rectification unit comprises a first diode and a first IGBT (insulated gate bipolar transistor), the second rectification unit comprises a second diode and a second IGBT, the first rectification unit and the second rectification unit are connected in parallel, the first rectification unit and the second rectification unit respectively comprise a branch formed by connecting a diode and an IGBT (insulated gate bipolar transistor) with a freewheeling diode in series, the control ends of the two IGBT of the rectification module are respectively connected with the controller, and the two IGBT of the rectification module are switched on and off under the control of the controller so as to correct the power factor of the direct current voltage and the direct current output by the rectification module;
and the common joint of the first capacitor and the second capacitor is connected with the alternating current power supply loop, so that a voltage-multiplying rectification circuit is formed by the rectification module, the first capacitor and the second capacitor.
Preferably, the anode of the first diode is connected to the source of the first IGBT, the anode of the second diode is connected to the source of the second IGBT, the cathode of the first diode is connected in parallel to the cathode of the second diode as the anode output terminal of the rectifier module, and the drain of the first IGBT is connected in parallel to the drain of the second IGBT as the cathode output terminal of the rectifier module.
Preferably, the anode of the first diode is connected to the source of the first IGBT, the anode of the second diode is connected to the source of the second IGBT, the source of the first IGBT and the source of the second IGBT are connected in parallel to serve as the anode output end of the rectifier module, and the cathode of the first diode and the cathode of the second diode are connected in parallel to serve as the cathode output end of the rectifier module.
Preferably, a common junction of the first capacitor and the second capacitor is connected to a zero line input end of the alternating voltage.
Preferably, the common junction of the first capacitor and the second capacitor is connected to the live input end of the alternating voltage.
Preferably, the device also comprises a current detection module,
the current detection module is connected in series with the alternating current loop, and the output end of the current detection module is connected with the controller to detect the value of the alternating current input by the alternating current power supply.
Preferably, the device also comprises a zero-crossing detection module,
the zero-crossing detection module is connected with the input end of the alternating current power supply in parallel, the output end of the zero-crossing detection module is connected with the controller so as to detect a voltage zero-crossing signal of the alternating current power supply, and the controller controls the switching states of the two IGBT tubes of the rectification module to be switched according to the voltage zero-crossing signal.
Preferably, the device also comprises a voltage detection module,
the voltage detection module is connected to the output end of the rectification module in parallel, and the output end of the voltage detection module is connected with the controller to detect the direct-current voltage value output by the rectification module.
In order to achieve the purpose, the invention also provides an inverter air conditioner which comprises the PFC circuit.
According to the PFC circuit provided by the invention, two branches which are formed by connecting a diode and an IGBT (insulated gate bipolar transistor) tube with a freewheeling diode in series are arranged and connected in parallel to form a rectifying module, the reactor is connected with the input end of an alternating current power supply, the reactor and the rectifying module are connected in series in an alternating current power supply loop, a first capacitor and a second capacitor are connected in series and then connected in parallel at the output end of the rectifying module, and the common joint of the first capacitor and the second capacitor is connected with the alternating current loop.
Drawings
Fig. 1 is a schematic circuit diagram of a PFC circuit according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a current loop of the reactor in the first embodiment when storing energy;
FIG. 3 is a schematic diagram of a current loop for charging the first capacitor according to the first embodiment;
FIG. 4 is a schematic diagram of another current loop of the reactor in the first embodiment when storing energy;
FIG. 5 is a schematic diagram of a current loop for charging the second capacitor in the first embodiment;
fig. 6 is a schematic circuit diagram of a PFC circuit according to a second embodiment of the present invention;
FIG. 7 is a schematic diagram of a current loop for charging the second capacitor according to the second embodiment;
FIG. 8 is a schematic diagram of a current loop for charging the first capacitor according to the second embodiment;
fig. 9 is a schematic circuit diagram of a PFC circuit according to a third embodiment of the present invention;
fig. 10 is a schematic circuit diagram of a PFC circuit according to a fourth embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
Referring to fig. 1, fig. 1 is a block diagram of a PFC circuit according to a first embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:
the PFC circuit provided by the embodiment of the present invention includes a reactor L, a rectifier module 10, a first capacitor E1, a second capacitor E2, a controller 20, and a driving module 30;
the reactor L is connected with the input end of the alternating current power supply, and the reactor L and the rectifying module 10 are connected in series in an alternating current power supply loop;
the first capacitor E1 and the second capacitor E2 are connected in series and then connected in parallel to the output end of the rectifier module 10,
the driving module 30 is connected in parallel to the output end of the rectifying module 10, the rectifying module 10 rectifies the input alternating current into direct current to provide a power supply for the driving module 30 to work, the control end of the driving module 30 is connected with the controller 20, and the controller 20 controls the driving module 30 to drive the load to operate;
the rectifying module 10 comprises a first rectifying unit 11 and a second rectifying unit 12, the first rectifying unit 11 comprises a first diode D1 and a first IGBT tube Q1, the second rectifying unit 12 comprises a second diode D2 and a second IGBT tube Q2, the first rectifying unit 11 and the second rectifying unit 12 are connected in parallel, the first rectifying unit 11 and the second rectifying unit 12 respectively comprise a branch formed by a diode and an IGBT tube (Insulated Gate Bipolar Transistor) with a freewheeling diode connected in series, control ends of the two IGBT tubes of the rectifying module 10 are respectively connected with the controller 20, and the two IGBT tubes of the rectifying module 10 are switched under the control of the controller 20 to perform power factor correction on the direct current voltage and the direct current output by the rectifying module 10;
the common junction point of the first capacitor E1 and the second capacitor E2 is connected to the ac power supply circuit, so that the rectifier module 10, the first capacitor E1 and the second capacitor E2 form a voltage-doubling rectifier circuit.
The first rectifying unit 11 of the rectifying module 10 includes a first diode D1 and a first IGBT tube Q1, and the second rectifying unit 12 includes a second diode D2 and a second IGBT tube Q2;
the positive pole of first diode D1 is connected with the collector of first IGBT pipe Q1, and the positive pole of second diode D2 is connected with the collector of second IGBT pipe Q2, and the positive pole output of rectifier module 10 is connected in parallel as to the negative pole of first diode D1 and the negative pole of second diode D2, and the emitting pole of first IGBT pipe Q1 and the emitting pole of second IGBT pipe Q2 are connected in parallel as the negative pole output of rectifier module 10.
The common joint of the first capacitor E1 and the second capacitor E2 is connected with the zero line input end of the alternating current power supply.
The PFC circuit of this embodiment further includes a zero-crossing detection module 50, the zero-crossing detection module 50 is connected in parallel to the input end of the ac power supply, the output end of the zero-crossing detection module 50 is connected to the controller 20 to detect a voltage zero-crossing signal of the ac power supply, and the controller controls the switching states of the two IGBT tubes of the rectification module 10 according to the voltage zero-crossing signal. The specific circuit of the zero-crossing detection module 50 can refer to the prior art, and is not described herein again.
The PFC circuit of this embodiment further includes a current detection module 40, the current detection module 40 is connected in series to the ac loop, the current detection module 40 in fig. 1 is connected in series to a live line end of the ac power source, and certainly may be connected in series to a zero line end of the ac power source, and an output end of the current detection module 40 is connected to the controller 20 to detect an ac current value input by the ac power source. The current detection module 40 is composed of a current transformer T1 and an additional detection circuit, and the specific circuit of the current detection module 40 can refer to the prior art and is not described herein again.
The PFC circuit of this embodiment further includes a voltage detection module 60, wherein the voltage detection module 60 is connected in parallel to the output end of the rectification module 10, and the output end of the voltage detection module 60 is connected to the controller 20 to detect the dc voltage value output by the rectification module 10. The voltage detection module 60 may be formed by a simple circuit based on a resistor voltage division structure, and the specific circuit may refer to the prior art and is not described herein again.
The working principle of the PFC circuit shown in this embodiment is as follows: the rectifying and filtering circuit composed of the rectifying module 10, the first capacitor E1 and the second capacitor E2 operates in a voltage-multiplying rectifying mode. As shown in fig. 2, when the controller 20 controls the first IGBT Q1 to be turned on and the second IGBT Q2 to be turned off, at this time, the ac power supply current starts from the live line, i.e., the L line, and returns to the zero line of the ac power supply, i.e., the N line, through the reactor L, the collector and the emitter of the first IGBT Q1, and the anode and the cathode of the freewheeling diode D4 of the second IGBT Q2 to form a loop, so as to store energy in the reactor L; as shown in fig. 3, when the controller 20 controls the first IGBT Q1 to be turned off, an induced electromotive force is generated in the reactor L, and the direction of a current flowing through the reactor L is consistent with that before the first IGBT Q1 is turned off, and at this time, a current generated by the induced electromotive force of the reactor L forms a loop through the first diode D1 and the first capacitor E1 to charge the first capacitor E1, thereby realizing power factor correction of a dc voltage and a current output from the rectifier module 10 when an ac power supply current starts from an L line. As shown in fig. 4, when the controller 30 controls the second IGBT Q2 to be turned on and the first IGBT Q1 to be turned off, at this time, the ac power supply current starts from the live line, i.e., N line, and passes through the collector and emitter of the second IGBT Q2, the anode and cathode of the freewheeling diode D3 of the first IGBT Q1, and the reactor L returns to the zero line of the ac power supply, i.e., L line, to form a loop, so as to store energy for the reactor L; as shown in fig. 5, when the controller 20 controls the second IGBT Q2 to be turned off, the reactor L generates induced electromotive force, the direction of the current flowing through the reactor L is consistent with the direction of the current flowing through the second IGBT Q2 before being turned off, and the current generated by the induced electromotive force of the reactor L flows through the second capacitor E2 and the freewheeling diode D3 of the first IGBT Q1 to form a current loop to charge the second capacitor E2, thereby realizing power factor correction of the dc voltage and the current output from the rectifier module 10 when the ac power supply current starts from the N line. The induced electromotive forces with different polarities generated by the reactor L respectively charge the first capacitor E1 and the second capacitor E2, so that the voltages at the two ends of the first capacitor E1 and the second capacitor E2 are one time of the voltage on a single capacitor, and a voltage-doubling rectification mode is realized. Therefore, the controller respectively controls the first IGBT tube Q1 and the second IGBT tube Q2 to be switched on and off alternately, and the power factor correction function in the voltage-multiplying rectification mode is achieved.
In the PFC circuit shown in this embodiment, the load driven by the driving Module 30 includes a compressor or a motor, where the compressor or the motor is a permanent magnet synchronous motor, and the driving Module includes a circuit composed of IPM modules (Intelligent Power modules), and the driving Module is configured to invert direct current loaded on the IPM modules into alternating current to drive the compressor or the motor under the control of the controller 20. When the PFC circuit of this embodiment is in operation, because the PFC circuit inputs an alternating current, it needs to be ensured that a current is maintained when the first IGBT tube Q1 or the second IGBT tube Q2 operates to implement energy storage for the reactor L, so that the controller needs to detect a zero-crossing signal of the alternating current by the zero-detection module 50, and control the first IGBT tube Q1 or the second IGBT tube to be turned on after the zero-crossing to ensure that energy storage for the reactor L can be implemented by a continuous current. In addition, during the working process of the PFC circuit, the controller 20 needs to obtain the current working current of the circuit through the current detection module 40, and if the working current of the load is found to be too high, which causes the too high working current of the PFC circuit, the controller 20 controls the two IGBT tubes to be turned off to turn off the PFC circuit to protect the whole PFC circuit. In the process of the PFC circuit of this embodiment, the controller 20 further needs to detect the dc voltage output by the rectifier module, i.e. the dc bus voltage, in real time through the voltage detection module 60, and when the dc bus voltage value is higher, the output dc bus voltage value is reduced by adjusting the pulse width value of the first IGBT tube Q1 or the second IGBT tube.
As can be known from the above-mentioned operation process, when the PFC circuit operates in the voltage-doubling rectification mode, when the reactor L stores energy, the current loop only passes through the freewheeling diode of one of the IGBT tubes, and when the reactor L generates induced electromotive force to charge the first capacitor E1 and the second capacitor E2, the current loop only passes through one of the diodes or the freewheeling diode of one of the IGBT tubes. Compared with the prior art that when the PFC circuit sampling two rectifier bridge stacks works, each diode of each bridge stack works, the PFC circuit of the embodiment of the invention greatly reduces the working number of the diodes when in work, thereby reducing the heating loss of the whole PFC circuit and reducing the energy waste.
According to the PFC circuit provided by the embodiment of the invention, two branches which are formed by connecting diodes and IGBT tubes with freewheeling diodes in series are arranged and connected in parallel to form a rectifying module 10, a reactor L is connected with the input end of an alternating current power supply, the reactor L and the rectifying module 10 are connected in series in an alternating current power supply loop, a first capacitor E1 and a second capacitor E2 are connected in series and then connected in parallel at the output end of the rectifying module 10, and the common junction of the first capacitor E1 and the second capacitor E2 is connected with the alternating current loop. When the PFC circuit works, a current loop of the PFC circuit only passes through one diode or a freewheeling diode of one IGBT tube, and compared with the prior art which needs to pass through each diode of two rectifier bridge stacks, the working quantity of the diodes is greatly reduced, so that the heating loss of the whole PFC circuit is reduced, and the energy waste is reduced.
Further, based on the first embodiment of the PFC circuit of the present invention, as shown in fig. 6, the PFC circuit of the second embodiment of the present invention is different from the first embodiment in the connection manner of the common point of the first capacitor E1 and the second capacitor E2.
The common joint of the first capacitor E1 and the second capacitor E2 is connected with the live wire input end of the alternating current power supply.
In this embodiment, the common junction of the first capacitor E1 and the second capacitor E2 is instead connected to the end of the line, i.e. the L-terminal, of the near ac power source, specifically, connected in parallel between the reactor L and an ac input terminal of the rectifier module 20.
When the PFC circuit of this embodiment operates, the operating principle of the reactor L is the same as that of the first embodiment when the first IGBT Q1 or the second IGBT Q2 is turned on so that the reactor L is in the energy storage state, except that the current loop formed by the induced electromotive force generated by the reactor L is different when the first IGBT Q1 or the second IGBT Q2 is turned off. As shown in fig. 7, when the first IGBT Q1 is turned off from on, an induced electromotive force is generated in the reactor L, and the direction of the current flowing through the reactor L is the same as that before the first IGBT Q1 is turned off, and at this time, the current generated by the induced electromotive force of the reactor L flows through the second capacitor E2 and the freewheeling diode D4 of the second IGBT Q2 to form a loop to charge the second capacitor E2, thereby realizing power factor correction of the dc voltage and the current output from the rectifier module 10 when the ac power supply current starts from the L line; as shown in fig. 8, when the second IGBT tube Q2 is turned off from on, an induced electromotive force is generated in the reactor L, and the direction of the current flowing through the reactor L is the same as that before the second IGBT tube Q2 is turned off, and at this time, the current generated by the induced electromotive force of the reactor L flows through the second diode D2 and the first capacitor E1 to form a loop to charge the first capacitor E1, thereby realizing power factor correction of the dc voltage and the current output from the rectifier module 10 when the ac power supply current starts from the N-line direction. The charging process only needs one diode, and compared with the prior art, the charging process needs to greatly reduce each diode passing through two rectifier bridge stacks, so that the heating loss of the whole PFC circuit is reduced.
Further, based on the first embodiment of the PFC circuit of the present invention, a PFC circuit according to a third embodiment of the present invention is shown in fig. 9, and is different from the first embodiment in a circuit structure of the rectifying module 10.
The positive pole of first diode is connected the collector of first IGBT pipe Q1, and the positive pole of second diode is connected the collector of second IGBT pipe Q2, and the positive pole output as rectifier module is parallelly connected with the negative pole of second diode to the first diode negative pole, and the emitting pole of first IGBT pipe Q1 and the emitting pole of second IGBT pipe Q2 are parallelly connected as rectifier module's negative pole output. That is, the connection positions of the diodes and the IGBT tubes in the first rectifying unit 11 and the second rectifying unit 12 are exchanged with respect to the first embodiment.
The PFC circuit of this embodiment is similar to the first embodiment in that when the first IGBT Q1 or the second IGBT Q2 of the PFC circuit is turned on, its current respectively passes through the freewheeling diode of one of the IGBT and the collector and emitter of the other IGBT in the current loop to store energy in the reactor L; when the first IGBT Q1 or the second IGBT Q2 is turned on and turned off, the induced electromotive force generated by the reactor L charges the first capacitor E1 or the second capacitor E2 through the freewheeling diode D3 or the first diode D1 of the first IGBT Q1, and the charging loop thereof only passes through one diode or the freewheeling diode of one IGBT at most, which is the same as the diode of the first embodiment in terms of the number of operations, so that the number of operations of the diodes is greatly reduced as compared with the prior art, and thus, the heat loss of the entire PFC circuit is reduced, and the energy waste is reduced.
Further, based on the third embodiment of the PFC circuit of the present invention, as shown in fig. 10, the PFC circuit of the fourth embodiment of the present invention is different from the third embodiment in the connection manner of the common point of the first capacitor E1 and the second capacitor E2. The connection mode of the common junction of the first capacitor E1 and the second capacitor E2 is the same as the circuit connection mode of the common junction of the first capacitor E1 and the second capacitor E2 in the second embodiment.
The principle of the PFC circuit of this embodiment is similar to that of the third embodiment, and in the working process of the PFC circuit, the number of diodes in the current loop is at most only one diode or one freewheeling diode of an IGBT, which is the same as that of the first embodiment, so that the number of diodes is greatly reduced compared with the prior art, the heat loss of the entire PFC circuit is reduced, and the energy waste is reduced.
The present invention further provides an inverter air conditioner, which comprises an indoor unit and an outdoor unit, wherein the outdoor unit comprises an inverter compressor, and the outdoor unit control circuit comprises the PFC circuit.
In the description herein, references to the description of the terms "first embodiment," "second embodiment," "example," etc., mean that a particular method, apparatus, or feature described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, methods, apparatuses, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (9)

1. A power factor correction circuit is characterized by comprising an electric reactor, a rectifying module, a first capacitor, a second capacitor, a controller and a driving module;
the reactor is connected with the input end of the alternating current power supply, and the reactor and the rectifying module are connected in series in an alternating current power supply loop;
the first capacitor and the second capacitor are connected in series and then connected in parallel at the output end of the rectifying module,
the driving module is connected with the output end of the rectifying module in parallel, the rectifying module rectifies input alternating current into direct current to provide a power supply for the driving module to work, the control end of the driving module is connected with the controller, and the controller controls the driving module to drive a load to operate;
the rectification module comprises a first rectification unit and a second rectification unit, the first rectification unit comprises a first diode and a first IGBT (insulated gate bipolar transistor), the second rectification unit comprises a second diode and a second IGBT, the first rectification unit and the second rectification unit are connected in parallel, the first rectification unit and the second rectification unit respectively comprise a branch formed by connecting a diode and an IGBT (insulated gate bipolar transistor) with a freewheeling diode in series, the control ends of the two IGBT of the rectification module are respectively connected with the controller, and the two IGBT of the rectification module are switched on and off under the control of the controller so as to correct the power factor of the direct current voltage and the direct current output by the rectification module;
and the common joint of the first capacitor and the second capacitor is connected with the alternating current power supply loop, so that a voltage-multiplying rectification circuit is formed by the rectification module, the first capacitor and the second capacitor.
2. The power factor correction circuit of claim 1,
the positive electrode of the first diode is connected with the source electrode of the first IGBT tube, the positive electrode of the second diode is connected with the source electrode of the second IGBT tube, the negative electrode of the first diode is connected with the negative electrode of the second diode in parallel to serve as the positive electrode output end of the rectification module, and the drain electrode of the first IGBT tube is connected with the drain electrode of the second IGBT tube in parallel to serve as the negative electrode output end of the rectification module.
3. The power factor correction circuit of claim 1,
the positive electrode of the first diode is connected with the source electrode of the first IGBT tube, the positive electrode of the second diode is connected with the source electrode of the second IGBT tube, the source electrode of the first IGBT tube and the source electrode of the second IGBT tube are connected in parallel to be used as the positive electrode output end of the rectifying module, and the negative electrode of the first diode and the negative electrode of the second diode are connected in parallel to be used as the negative electrode output end of the rectifying module.
4. The power factor correction circuit of claim 1,
and the common joint of the first capacitor and the second capacitor is connected with the zero line input end of the alternating voltage.
5. The power factor correction circuit of claim 1,
and the common joint of the first capacitor and the second capacitor is connected with the live wire input end of the alternating voltage.
6. The power factor correction circuit of claim 1, further comprising a current detection module,
the current detection module is connected in series with the alternating current power supply loop, and the output end of the current detection module is connected with the controller so as to detect the alternating current value input by the alternating current power supply.
7. The power factor correction circuit of claim 1, further comprising a zero crossing detection module,
the zero-crossing detection module is connected with the input end of the alternating current power supply in parallel, the output end of the zero-crossing detection module is connected with the controller to detect a voltage zero-crossing signal of the alternating current power supply, and the controller controls the switching states of two IGBT tubes of the rectification module to be switched according to the voltage zero-crossing signal.
8. The power factor correction circuit of claim 1, further comprising a voltage detection module,
the voltage detection module is connected in parallel with the output end of the rectification module, and the output end of the voltage detection module is connected with the controller so as to detect the direct-current voltage value output by the rectification module.
9. An inverter air conditioner comprising the power factor correction circuit as claimed in any one of claims 1 to 8.
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CN108023473B (en) * 2018-01-29 2023-10-31 广东美的制冷设备有限公司 PFC circuit, motor control system and variable frequency air conditioner
CN108054913B (en) * 2018-01-29 2023-11-28 广东美的制冷设备有限公司 PFC circuit, motor control system and variable frequency air conditioner
CN113972826B (en) * 2020-07-22 2023-09-19 广东美的制冷设备有限公司 Totem pole PFC circuit, control method thereof, circuit board, air conditioner and storage medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101924481A (en) * 2009-06-09 2010-12-22 深圳市盛弘电气有限公司 PFC (Power Factor Correction) rectifier circuit
CN104834239A (en) * 2015-05-12 2015-08-12 广东美的制冷设备有限公司 Current loop communication and power supply control circuit of air conditioner and outdoor unit thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201349720A (en) * 2012-05-24 2013-12-01 Shi Jie Magnetic Energy Co Ltd Three-phase reactance power saving device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101924481A (en) * 2009-06-09 2010-12-22 深圳市盛弘电气有限公司 PFC (Power Factor Correction) rectifier circuit
CN104834239A (en) * 2015-05-12 2015-08-12 广东美的制冷设备有限公司 Current loop communication and power supply control circuit of air conditioner and outdoor unit thereof

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