CN112636577A - PFC circuit compatible with single-phase and three-phase alternating-current input, control method and charger - Google Patents

PFC circuit compatible with single-phase and three-phase alternating-current input, control method and charger Download PDF

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Publication number
CN112636577A
CN112636577A CN202011363465.5A CN202011363465A CN112636577A CN 112636577 A CN112636577 A CN 112636577A CN 202011363465 A CN202011363465 A CN 202011363465A CN 112636577 A CN112636577 A CN 112636577A
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CN
China
Prior art keywords
phase
switching tube
module
pfc
switch
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Pending
Application number
CN202011363465.5A
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Chinese (zh)
Inventor
闻伟
王燕彬
袁文
王小昆
刘少伟
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United Automotive Electronic Systems Co Ltd
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United Automotive Electronic Systems Co Ltd
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Priority to CN202011363465.5A priority Critical patent/CN112636577A/en
Publication of CN112636577A publication Critical patent/CN112636577A/en
Priority to PCT/CN2021/111058 priority patent/WO2022110891A1/en
Pending legal-status Critical Current

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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
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference 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
    • 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
    • H02M7/219—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 in a bridge configuration
    • 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 compatible with single-phase and three-phase alternating current input, a control method and a charger, wherein the PFC circuit can be used for a vehicle-mounted motor and is used for connecting an alternating current network side and a direct current circuit side, and the PFC circuit comprises a relay module, a three-phase PFC power module and a direct current side filtering module. Two of the two phases of the alternating current network side are respectively connected with two input ends of the three-phase PFC power module, and the third phase of the zero line or the alternating current network side is connected with the third input end of the three-phase PFC power module through the relay module. The working modes of the PFC circuit comprise a three-phase working mode and a single-phase working mode, and the three-phase working mode and/or the three-phase working mode can work in a rectification state or an inversion state respectively. The PFC circuit provided by the invention has the advantages that the number of the relays used is less, the cost and the size of the circuit board can be saved, and no matter whether the three-phase input is suddenly changed into the single-phase input or the single-phase input is suddenly changed into the three-phase input, the relay module cannot short circuit the power grid circuit, so that the failure risk is low.

Description

PFC circuit compatible with single-phase and three-phase alternating-current input, control method and charger
Technical Field
The invention relates to the technical field of power circuits, in particular to a PFC circuit compatible with single-phase and three-phase alternating-current input, a control method and a charger.
Background
Along with the increasingly popular application of electric vehicles, a vehicle-mounted charger, as a common power electronic conversion device, causes harmonic pollution to a power grid and increases reactive power of the power grid, and is one of the problems to be solved by technical personnel in the field. Therefore, in order to reduce the harmonic content of the ac current on the vehicle-mounted charger grid side and to bring the vehicle-mounted charger grid side current into phase with the grid voltage, a PFC circuit (power factor correction) is generally employed to reduce the reactive power. At the same time, common mains supply inputs have two typical distributions, single-phase and three-phase, due to infrastructure limitations. Therefore, in order to improve the compatibility of the vehicle-mounted charger, the requirement of being compatible with single/three-phase alternating current input is provided for the electric device; further, with the development of smart grid technology, users demand load feedback technology (V2L) and vehicle-to-vehicle charging technology (V2V) for vehicle-mounted power batteries. All of the above functions are basic functions required by the vehicle-mounted charger PFC circuit.
In the prior art, as shown in fig. 1, in a conventional PFC circuit compatible with single/three-phase ac input, by controlling a switch of a relay, the circuit can operate in a single-phase mode and a three-phase mode, respectively, so as to implement single-phase and three-phase compatibility of the PFC circuit. The working principle is as follows: when the relays RL01, RL03 and RL05 are turned off and the relays RL02 and RL04 are turned on, the PFC circuit operates in a three-phase mode, and energy can be transferred from the ac power grid side to the dc power grid side (rectification side) or from the dc power grid side to the ac power grid side (inverter side) by controlling the duty ratios of the switching tubes Q1 to Q6. When the relays RL01 and RL04 are disconnected and the relays RL02, RL03 and RL05 are closed, the PFC circuit works in a single-phase mode and can be equivalent to a two-phase Boost circuit connected in parallel in a staggered mode, and when the PFC circuit works in a rectification state, currents of the inductors L1 and L2 are staggered by 180 degrees through a control algorithm, so that the harmonic content of the input side current of a single-phase power grid can be reduced. Meanwhile, the duty ratio of the switching tubes Q1-Q4 can be controlled, so that the circuit works in an inversion state, and energy is inverted back to the power grid from the direct current circuit side.
However, the conventional PFC circuit compatible with single/three phase input has the following drawbacks:
1. in order to suppress the starting rush current of the PFC circuit and realize the switching of the three-phase/single-phase working modes, the traditional PFC circuit compatible with single/three-phase input needs five relays, the number of the relays is large, and the size and the cost are high.
2. The failure risk is high: when the input is suddenly changed from single phase to three-phase, the line voltage between U/V is short-circuited by the relay RL03, and the relay RL03 is easily failed. Specifically, as shown in fig. 2, when the conventional single/three-phase input-compatible PFC circuit operates in the normal single-phase charging mode, the relays RL02, RL03, RL05 are closed, and the relays RL01, RL04 are opened. At this time, if the voltage on the ac grid side suddenly changes from single phase to three phase, the relay RL03 is still in a closed state, a current loop as shown in fig. 3 exists between U, V phases, and a large current passes through the relay RL03 due to instantaneous short circuit, so that the relay RL03 is very prone to failure when the input grid voltage suddenly changes.
EMI noise is large: referring to fig. 2, in the single-phase mode, the PFC-free inductor on the N line suppresses high-frequency current noise (such as common mode noise) on the full-bridge side, so that the high-frequency current is easily conducted to the ac network side through the N line, and the EMI noise on the ac network side is increased.
Therefore, how to provide a PFC circuit compatible with single-phase and three-phase ac inputs to overcome the defects of the conventional PFC circuit compatible with single/three-phase ac inputs is becoming one of the technical problems to be solved by those skilled in the art.
It is noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a PFC circuit compatible with single-phase and three-phase alternating-current input, a control method and a charger aiming at the defects of the prior art, so that relay resources are saved, the cost and the cost of the PFC circuit are reduced, and the failure risk of a relay is reduced.
In order to achieve the purpose, the invention is realized by the following technical scheme: a PFC circuit compatible with single-phase and three-phase alternating-current input is connected with an alternating-current power grid side and a direct-current power grid side and comprises a relay module, a three-phase PFC power module and a direct-current side filtering module;
the first phase and the second phase of the alternating current power grid side are respectively connected with the first input end and the second input end of the three-phase PFC power module, and the zero line or the third phase of the alternating current power grid side is connected with the third input end of the three-phase PFC power module through the relay module;
the relay module is configured to: controlling the on-off state of an internal switch according to a driving signal, and conducting the zero line and a third input end of the three-phase PFC power module to enter a single-phase working mode; or conducting a third phase of the alternating current power grid side and a third input end of the three-phase PFC power module to enter a three-phase working mode;
in accordance with control signals, the three-phase PFC power module is configured to: controlling the single-phase working mode to work in a rectification state or an inversion state;
or
Controlling the three-phase working mode to work in a rectification state or an inversion state;
the output end of the three-phase PFC power module is connected with the direct current circuit side through the direct current side filtering module.
Optionally, the relay module comprises a single pole double throw switch;
the fixed end of the single-pole double-throw switch is connected with a third input end of the three-phase PFC power module;
according to the driving signal, the moving end of the single-pole double-throw switch is configured to:
conducting the zero line and a third input end of the three-phase PFC power module to enter a single-phase working mode;
or
And conducting a third phase on the AC power grid side and a third input end of the three-phase PFC power module to enter a three-phase working mode.
Optionally, the relay module comprises a first switch and a second switch;
one end of the first switch is connected with the zero line, and the other end of the first switch is connected with a third input end of the three-phase PFC power module;
one end of the second switch is connected with a third phase on the alternating current power grid side, and the other end of the second switch is connected with a third input end of the three-phase PFC power module;
in accordance with the drive signal, the first switch and the second switch are configured to:
closing the first switch and opening the second switch, and conducting the zero line and a third input end of the three-phase PFC power module to enter a single-phase working mode;
and opening the first switch and closing the second switch, and conducting a third phase on the alternating current power grid side and a third input end of the three-phase PFC power module to enter a three-phase working mode.
Optionally, the three-phase PFC power module includes a three-phase full-bridge switching circuit, where the three-phase full-bridge switching circuit includes a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, and a sixth switching tube;
the first switching tube, the third switching tube and the fifth switching tube respectively form three upper bridge arms, and drain electrode output ends of the three upper bridge arms are connected and connected with the anode of the direct current side filtering module;
the second switching tube, the fourth switching tube and the sixth switching tube respectively form three lower bridge arms, and source electrode output ends of the three lower bridge arms are connected and connected with the negative electrode of the direct current side filtering module;
defining outgoing lines at the joints of the three upper bridge arms and the three lower bridge arms as a first outgoing line, a second outgoing line and a third outgoing line respectively;
the first outgoing line is connected with a first phase of the alternating current power grid side, the second outgoing line is connected with a second phase of the alternating current power grid side, and the third outgoing line is connected with the zero line or a third phase of the alternating current power grid side through the relay module.
Optionally, the three-phase PFC power module further includes a first inductor, a second inductor, and a third inductor;
one end of the first inductor is connected with a first phase of the alternating current power grid side, and the other end of the first inductor is connected with the first outgoing line;
one end of the second inductor is connected with a second phase on the alternating current power grid side, and the other end of the second inductor is connected with the second outgoing line;
one end of the third inductor is connected with the third phase of the zero line or the alternating current power grid side through the relay module, and the other end of the third inductor is connected with the third outgoing line.
Optionally, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and/or the sixth switching tube include a MOSFET tube and/or an IGBT.
Optionally, the dc-side filtering module includes a first capacitor and a second capacitor connected in series;
the positive electrode of the first capacitor is connected with the drain electrode output ends of the three upper bridge arms, and the negative electrode of the first capacitor is connected with the positive electrode of the second capacitor;
and the negative electrode of the second capacitor is connected with the source electrode output ends of the three lower bridge arms.
Optionally, the dc-dc converter further comprises a rush current suppression module, and the three-phase PFC power module is connected to the dc-side filtering module via the rush current suppression module.
Optionally, the inrush current suppression module includes a third switch and a first resistor connected in parallel;
one end of the third switch is connected with one end of the first resistor to form a first connection end of the surge current suppression module, and one end of the third switch is connected with the other end of the first resistor to form a second connection end of the surge current suppression module;
the first connecting end of the impact current suppression module is connected with the drain electrode output ends of the three upper bridge arms, and the second connecting end of the impact current suppression module is connected with the anode of the direct current side filter module;
or
The first connecting end of the impact current suppression module is connected with the source electrode output ends of the three lower bridge arms, and the second connecting end of the impact current suppression module is connected with the negative electrode of the direct current side filter module.
Based on the same inventive concept, the invention also provides a control method of the PFC circuit compatible with single-phase and three-phase alternating-current input based on any one of the above, which comprises the following steps:
s1: the relay module controls the on-off state of an internal switch according to a driving signal, and conducts the zero line and a third input end of the three-phase PFC power module to enter a single-phase working mode; or conducting a third phase of the alternating current power grid side and a third input end of the three-phase PFC power module to enter a three-phase working mode;
s2: the three-phase PFC power module controls the single-phase working mode to work in a rectification state or an inversion state according to a control signal; or controlling the three-phase working mode to work in a rectification state or an inversion state;
rectifying the commercial power input from the AC power grid side and then outputting positive and negative bus voltages to the DC side filtering module, or inverting the DC voltage at the DC side and then outputting AC voltage to the AC power grid side;
s3: and the direct current side filtering module filters the positive and negative bus voltages and outputs the filtered positive and negative bus voltages to the direct current side.
Optionally, the PFC circuit further comprises a rush current suppression module, which includes a third switch and a first resistor connected in parallel;
the three-phase PFC power module is connected with the direct current side filtering module through the inrush current suppression module;
when the PFC circuit is started, the third switch is switched off, and the three-phase PFC power module is connected with the direct current side filtering module through the first resistor;
when the PFC circuit works in a single-phase or three-phase working mode, the third switch is closed, and the three-phase PFC power module is conducted with the direct-current side filtering module.
Optionally, the three-phase PFC power module includes a three-phase full-bridge switching circuit, where the three-phase full-bridge switching circuit includes a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, and a sixth switching tube;
the first switching tube, the third switching tube and the fifth switching tube respectively form three upper bridge arms, and drain electrode output ends of the three upper bridge arms are connected and connected with the anode of the direct current side filtering module;
the second switching tube, the fourth switching tube and the sixth switching tube respectively form three lower bridge arms, and source electrode output ends of the three lower bridge arms are connected and connected with the negative electrode of the direct current side filtering module;
defining outgoing lines at the joints of the three upper bridge arms and the three lower bridge arms as a first outgoing line, a second outgoing line and a third outgoing line respectively;
the first outgoing line is connected with a first phase on the alternating current power grid side, the second outgoing line is connected with a second phase on the alternating current power grid side, and the third outgoing line is connected with the zero line or a third phase on the alternating current power grid side through the relay module;
in step S2, the method for controlling the single-phase PFC power module to operate in a rectification state or an inversion state according to the control signal includes:
in a single-phase working mode, the control signal comprises a single-pole frequency multiplication SPWM modulation mode;
when the single-phase working mode works in a rectification state, the control signal controls the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube to convert the single-phase alternating current on the alternating current power grid side into direct current; the duty ratio of the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube is changed to regulate the output voltage of the direct current circuit side;
when the single-phase working mode works in an inversion state, the control signal adjusts duty ratios of the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube, the direct current at the direct current side is inverted to the single-phase alternating current, and the single-phase alternating current is transmitted to the alternating current power grid side.
Optionally, in step S2, the method for controlling the three-phase operation mode to operate in the rectification state or the inversion state includes:
under a three-phase working mode, the control signal comprises a voltage space vector modulation mode;
and adjusting the duty ratios of the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube through the voltage space vector modulation mode, and controlling the three-phase working mode to work in a rectification state or an inversion state.
Optionally, in the single-phase operation mode or the three-phase operation mode, the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube, and the sixth switching tube all operate in a PWM mode.
Based on the same inventive concept, the invention also provides a charger, which comprises the PFC circuit compatible with single-phase and three-phase alternating-current input.
Compared with the prior art, the PFC circuit compatible with single-phase and three-phase alternating-current input provided by the invention has the following beneficial effects:
the PFC circuit compatible with single-phase and three-phase alternating current input is connected with an alternating current network side and a direct current circuit side. The PFC circuit comprises a relay module 300, a three-phase PFC power module and a direct current side filtering module. The first phase and the second phase of the alternating current power grid side are respectively connected with the first input end and the second input end of the three-phase PFC power module, and the zero line or the third phase of the alternating current power grid side is connected with the third input end of the three-phase PFC power module through the relay module. The relay module is configured to: controlling the on-off state of an internal switch according to a driving signal, and conducting the zero line and a third input end of the three-phase PFC power module to enter a single-phase working mode; or conducting a third phase of the alternating current power grid side and a third input end of the three-phase PFC power module to enter a three-phase working mode. In accordance with control signals, the three-phase PFC power module is configured to: controlling the single-phase working mode to work in a rectification state or an inversion state; or controlling the three-phase working mode to work in a rectification state or an inversion state; the output end of the three-phase PFC power module is connected with the direct current circuit side through the direct current side filtering module. By the configuration, the PFC circuit provided by the invention needs fewer relays, saves electric elements, reduces the cost and saves resources; furthermore, the layout difficulty of the PFC circuit can be reduced, the size (such as volume) of a related circuit board is reduced, and the charger is more convenient to assemble; still further, because no relay is connected across the two-phase ac grid input lines, no matter whether the input is suddenly changed from a single-phase input to a three-phase input or from a three-phase input to a single-phase input, the relay connected across the two-phase ac grid will not short circuit the grid, and the risk of failure is low.
Furthermore, no matter in a single-phase working mode or a three-phase working mode, the inductance of the PFC circuit compatible with single-phase and three-phase alternating-current input is of a symmetrical structure, and inductance filtering is arranged on a U-phase line and an N-phase line under the single-phase mode, so that high-frequency current is difficult to conduct to the alternating-current power grid side through the N-phase line, and EMI noise on the alternating-current power grid side is greatly reduced.
Still further, the PFC circuit further includes an inrush current suppression module, the inrush current suppression module includes a first resistor (thermistor) and a third switch, and the dc-side filtering module includes a first capacitor and a second capacitor. The third switch is switched off, the PFC circuit works in a single-phase working mode or a three-phase working mode, and the first resistor can participate in the starting process of the PFC circuit, so that the soft start of the PFC circuit is realized. The single-phase or three-phase alternating current on the alternating current network side is pre-charged to a first capacitor and a second capacitor of the direct current side filter module through an inductor, a switching tube and the first resistor of the impact current suppression module of the three-phase PFC power module, and the first resistor can well limit the impact current at the moment of starting the PFC circuit, so that the power device is prevented from being damaged due to the fact that the starting impact current is too large.
Furthermore, the three-phase PFC power module of the PFC circuit further includes the first inductor, the second inductor, and the third inductor, and the inductors of the PFC circuit are symmetrical regardless of whether the PFC circuit is in a single-phase operation mode or a three-phase operation mode, and the U-phase and N-phase lines have inductive filtering in the single-phase mode, so that a high-frequency current is hardly conducted to the ac power grid side through the N-line, and EMI noise on the ac power grid side is greatly reduced.
The control method and the charger for the PFC circuit based on the compatible single-phase and three-phase alternating-current input, provided by the invention, belong to the same inventive concept as the PFC circuit based on the compatible single-phase and three-phase alternating-current input, so that the control method and the charger have at least the same beneficial effects, and are not repeated.
Drawings
Fig. 1 is a schematic diagram of a PFC circuit compatible with a single/three-phase ac input in the prior art;
FIG. 2 is a schematic diagram of the circuit configuration of FIG. 1 operating in single-phase charging;
FIG. 3 is a schematic diagram of a RL3 failure loop (with V) when the single-phase operation of FIG. 1 is changed from single-phase to three-phase operationVN＞VUNFor example);
fig. 4 is a schematic structural diagram of a PFC circuit compatible with single-phase and three-phase ac inputs according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a PFC circuit compatible with single-phase and three-phase ac inputs according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of another PFC circuit compatible with single-phase and three-phase ac inputs according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a PFC circuit compatible with single-phase and three-phase ac inputs according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a PFC circuit start-up inrush current suppression circuit based on the single-phase operation mode of fig. 6 (taking a positive half cycle of a single-phase power grid as an example);
FIG. 9 is a schematic diagram of a PFC circuit start-up inrush current suppression circuit based on the three-phase operation mode of FIG. 6 (with V)UN＞VVN＞VWNTime is an example);
FIG. 10 is a schematic diagram of an equivalent circuit operating in a rectified state based on the single-phase mode of operation of FIG. 6;
FIG. 11 is a schematic diagram of an equivalent circuit operating in an inversion state based on the single-phase operating mode of FIG. 6;
FIG. 12 is a schematic diagram of an equivalent circuit operating in a rectified state based on the three-phase operating mode of FIG. 6;
FIG. 13 is a schematic diagram of an equivalent circuit operating in an inverted state based on the three-phase operating mode of FIG. 6;
fig. 14 is a schematic flowchart of a control method of a PFC circuit based on compatible single-phase and three-phase ac inputs according to a second embodiment of the present invention;
the reference numerals are explained below:
100-alternating current network side, 200-direct current network side, 300-relay module, 400-three-phase PFC power module, 500-direct current side filtering module and 600-surge current suppression module;
RL 11-single-pole double-throw switch, RL 12-first switch, RL 13-second switch, RL 14-third switch, R1-first resistor;
q1-a first switching tube, Q2-a second switching tube, Q3-a third switching tube, Q4-a fourth switching tube, Q5-a fifth switching tube, and Q6-a sixth switching tube;
l1-first inductor, L2-second inductor, L3-third inductor;
c1-first capacitance, C2-second capacitance.
Detailed Description
In order to make the objects, advantages and features of the present invention more clear, the following describes in detail a PFC circuit, a control method and a charger that are compatible with single-phase and three-phase ac inputs, which are proposed by the present invention, with reference to the accompanying drawings. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. It should be understood that the drawings are not necessarily to scale, showing the particular construction of the invention, and that illustrative features in the drawings, which are used to illustrate certain principles of the invention, may also be somewhat simplified. Specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, locations, and configurations, will be determined in part by the particular intended application and use environment. In the embodiments described below, the same reference numerals are used in common between different drawings to denote the same portions or portions having the same functions, and a repetitive description thereof will be omitted. In this specification, like reference numerals and letters are used to designate like items, and therefore, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.
These terms, as used herein, are interchangeable where appropriate. Similarly, if the method described herein comprises a series of steps, the order in which these steps are presented herein is not necessarily the only order in which these steps may be performed, and some of the described steps may be omitted and/or some other steps not described herein may be added to the method.
< example one >
The present embodiment provides a PFC circuit compatible with single-phase and three-phase ac inputs, connecting an ac grid side 100 and a dc circuit side 200. Specifically, referring to fig. 4, the PFC circuit includes a relay module 300, a three-phase PFC power module 400, and a dc side filtering module 500. The first phase and the second phase of the ac power grid side 100 are connected to the first input end and the second input end of the three-phase PFC power module 400, respectively, and the zero line or the third phase of the ac power grid side 100 is connected to the third input end of the three-phase PFC power module 400 via the relay module 300. The relay module 300 is configured to: controlling the on-off state of an internal switch according to a driving signal, and conducting the zero line and the third input end of the three-phase PFC power module 400 to enter a single-phase working mode; or the third phase of the ac power grid side 100 is conducted with the third input terminal of the three-phase PFC power module 400 to enter the three-phase operation mode. In accordance with control signals, the three-phase PFC power module 400 is configured to: controlling the single-phase working mode to work in a rectification state or an inversion state; or controlling the three-phase working mode to work in a rectification state or an inversion state; the output terminal of the three-phase PFC power module 400 is connected to the dc circuit side 200 via the dc side filter module 500.
Preferably, in one exemplary embodiment, referring to fig. 5, the relay module 300 includes a single pole double throw switch RL 11; the fixed end of the single-pole double-throw switch RL11 is connected with the third input end of the three-phase PFC power module 400; according to the driving signal, the moving end of the single-pole double-throw switch RL11 is configured to: conducting an N-wire (the zero wire) and a third input terminal of the three-phase PFC power module 400 to enter a single-phase operation mode; or to conduct the W-phase (third phase) of the ac grid side 100 with the third input terminal of the three-phase PFC power module 400 to enter a three-phase operation mode.
Preferably, in one exemplary embodiment, referring to fig. 6, the relay module 300 includes a first switch RL12 and a second switch RL 13; one end of the first switch RL12 is connected to an N line (the zero line), and the other end of the first switch RL12 is connected to a third input end of the three-phase PFC power module 400; one end of the second switch RL13 is connected to the third phase of the ac power grid side 100, and the other end of the second switch RL13 is connected to the third input end of the three-phase PFC power module 400; according to the driving signal, the first switch RL12 and the second switch RL13 are configured to: closing the first switch RL12 and opening the second switch RL13, and connecting an N line with the third input terminal of the three-phase PFC power module 400 to enter a single-phase operation mode; the first switch RL12 is opened and the second switch RL13 is closed, so that the phase W of the ac power grid side 100 is connected with the third input end of the three-phase PFC power module 400 to enter a three-phase operation mode.
By the configuration, the PFC circuit compatible with single-phase and three-phase alternating-current input provided by the invention needs fewer relays, saves electric elements, reduces the cost and saves resources; furthermore, the layout difficulty of the PFC circuit can be reduced, the size (such as volume) of a related circuit board is reduced, and the charger is more convenient to assemble; still further, because no relay is connected across the two-phase ac grid input lines, no matter whether the input is suddenly changed from a single-phase input to a three-phase input or from a three-phase input to a single-phase input, the relay connected across the two-phase ac grid will not short circuit the grid, and the risk of failure is low.
Preferably, in an exemplary embodiment, with continued reference to fig. 5, fig. 6 or fig. 7, the three-phase PFC power module 400 includes a three-phase full-bridge switching circuit, which includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5 and a sixth switching tube Q6. The first switching tube Q1, the third switching tube Q3 and the fifth switching tube Q5 respectively form three upper bridge arms, and drain output ends of the three upper bridge arms are connected and connected with the anode of the dc-side filter module 500; the second switching tube Q2, the fourth switching tube Q4 and the sixth switching tube Q6 respectively form three lower bridge arms, and source output ends of the three lower bridge arms are connected to each other and connected to a negative electrode of the dc-side filter module 500.
Further, for convenience of understanding, the outgoing lines at the connection positions of the three upper bridge arms and the three lower bridge arms are defined as a first outgoing line (not shown in the drawings), a second outgoing line (not shown in the drawings), and a third outgoing line (not shown in the drawings), in other words, the first outgoing line is a first input end of the three-phase PFC power module 400, the second outgoing line is a second input end of the three-phase PFC power module, and the third outgoing line is a third input end of the three-phase PFC power module 400. Thereby, the first outlet is connected to the U-phase (i.e. the first phase) of the ac power network side 100, the second outlet is connected to the V-phase (i.e. the second phase) of the ac power network side 100, and the third outlet is connected to the N-line (i.e. the zero line) or the W-phase (i.e. the third phase) of the ac power network side 100 via the relay module 300. It should be understood that the above-mentioned embodiments are only descriptions of preferred embodiments, and are not limitations of the present invention, and in other embodiments, the relay module 200 may also be disposed between the U-phase of the ac power grid side 100 and the first outlet or between the V-phase of the ac power grid side 100 and the second outlet, which is not described in detail again, but is within the protection scope of the present invention.
Preferably, in one exemplary embodiment, with continued reference to fig. 5, 6, or 7, the three-phase PFC power module 400 further includes a first inductor L1, a second inductor L2, and a third inductor L3; one end of the first inductor L1 is connected to the first connection on the ac power grid side 100, and the other end of the first inductor L2 is connected to the first outlet; one end of the second inductor L2 is connected to the second phase of the ac power grid side 100, and the other end of the second inductor L2 is connected to the second outlet; one end of the third inductor L3 is connected to the neutral line or the third phase of the ac power grid side 100 via the relay module 300, and the other end of the third inductor L3 is connected to the third outlet line. Unlike the previous embodiment, in the present embodiment, one end of the first inductor L1 is a first input terminal of the three-phase PFC power module 400, one end of the second inductor L2 is a second input terminal of the three-phase PFC power module 400, and one end of the third inductor L3 is a third input terminal of the three-phase PFC power module 400.
With the configuration, no matter in a single-phase working mode or a three-phase working mode, the inductance of the PFC circuit compatible with single-phase and three-phase alternating-current input is of a symmetrical structure, and inductance filtering is arranged on the U-phase line and the N-phase line under the single-phase mode, so that high-frequency current is difficult to be conducted to the alternating-current power grid side through the N-phase line, and EMI noise on the alternating-current power grid side is greatly reduced.
Preferably, in one exemplary embodiment, the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the fifth switching tube Q5 and/or the sixth switching tube Q6 include, but are not limited to, a MOSFET tube and/or an IGBT.
Preferably, in one exemplary embodiment, with continued reference to fig. 5, 6, and 7, the dc-side filtering module 500 includes a first capacitor C1 and a second capacitor C2 connected in series. The positive electrode of the first capacitor C1 is connected with the drain output ends of the three upper bridge arms, and the negative electrode of the first capacitor C1 is connected with the positive electrode of the second capacitor C2; and the negative electrode of the second capacitor C2 is connected with the source output ends of the three lower bridge arms. Those skilled in the art will appreciate that this is merely a description of the preferred embodiment, and in other embodiments, the dc-side filtering module 500 includes, but is not limited to, a plurality of capacitors connected in series and then connected in parallel or a plurality of capacitors connected in parallel, and these variations are within the scope of the present invention.
Preferably, in an exemplary embodiment, with continued reference to fig. 5, fig. 6 and fig. 7, the PFC circuit compatible with single-phase and three-phase ac inputs further includes a rush current suppression module 600, and the three-phase PFC power module 400 is connected to the dc side filtering module 500 via the rush current suppression module 600. Specifically, the inrush current suppression module 600 includes a third switch RL14 and a first resistor R1 connected in parallel. One end of the third switch RL14 is connected to one end of the first resistor R1 to form a first connection terminal (not shown) of the inrush current suppression module 600, and one end of the third switch RL14 is connected to the other end of the first resistor R1 to form a second connection terminal (not shown) of the inrush current suppression module 600. In one embodiment, the first connection terminal of the inrush current suppression module 600 is connected to the drain output terminals of three upper bridge arms, and the second connection terminal of the inrush current suppression module 600 is connected to the positive electrode of the dc-side filter module 500. In another embodiment, the first connection terminal of the inrush current suppression module 600 is connected to the source output terminals of three lower bridge arms, and the second connection terminal of the inrush current suppression module 600 is connected to the negative electrode of the dc-side filter module 500. The first resistor R1 includes a thermistor (PTC).
So configured, the inrush current suppression strategy is as follows: when the third switch RL4 is turned off, the first resistor R1 can participate in the starting process of the PFC circuit no matter the PFC circuit works in a single-phase or three-phase mode, so as to realize the soft start of the PFC circuit. Specifically, referring to fig. 8 and fig. 9, wherein fig. 8 is a schematic diagram of a PFC circuit start-up inrush current suppression circuit in a single-phase operation mode (taking a positive half cycle of a single-phase power grid as an example), and fig. 9 is a schematic diagram of a PFC circuit start-up inrush current suppression circuit in a three-phase operation mode based on fig. 6 (taking V as an example)UN＞VVN＞VWNTime for example). The single-phase or three-phase alternating current at the alternating current network side is pre-charged to the first capacitor C1 and the second capacitor C2 of the dc-side filter module 500 after passing through the inductor, the switching tube of the three-phase PFC power module 400 and the first resistor R1 of the inrush current suppression module 600, and the first resistor R1 can well limit the inrush current at the moment of starting the PFC circuit, so that the power device is prevented from being damaged due to the overlarge starting inrush current.
So configured, the power conversion control strategy is as follows:
when the PFC circuit is in a single-phase operation mode, the first switch R12 is connected to the N line, and the third switch RL14 is closed, so that the PFC circuit is equivalent to that shown in fig. 10 and 11. Fig. 10 is a schematic diagram of an equivalent circuit of the PFC circuit in a rectification state in a single-phase operation mode; fig. 11 is a schematic diagram of an equivalent circuit of the PFC circuit in an inversion state of a single-phase operation mode.
When the PFC circuit is in a three-phase operation mode, the first switch R12 is connected to the W line, and the third switch RL14 is closed, so that the PFC circuit is equivalent to that shown in fig. 12 and 13. Fig. 12 is a schematic diagram of an equivalent circuit of the PFC circuit in a rectification state in a three-phase operation mode; fig. 13 is a schematic diagram of an equivalent circuit of the PFC circuit operating in an inversion state of a three-phase operating mode.
In particular, the present invention does not limit specific parameters of the related electrical devices, such as the single-pole double-throw switch RL11, the first switch RL12, the second switch RL13, the third switch RL13, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q6, the first capacitor C1, the second capacitor C2, and the first resistor R1, and the related parameters of each electrical device should be determined according to specific circuit requirements.
Therefore, the PFC circuit compatible with single-phase and three-phase alternating-current input provided by the invention can well inhibit the starting impact current of the PFC circuit through the cooperation of the impact current inhibiting module 600 and the relay module 300; the single/three-phase rectification and inversion functions can be realized by controlling the first to sixth switching tubes Q1-Q6.
< example two >
The present embodiment provides a method for controlling a PFC circuit compatible with single-phase and three-phase ac inputs according to any of the foregoing embodiments, with reference to fig. 14, including:
s1: the relay module controls the on-off state of an internal switch according to a driving signal, and conducts the zero line and a third input end of the three-phase PFC power module to enter a single-phase working mode; or conducting a third phase of the alternating current power grid side and a third input end of the three-phase PFC power module to enter a three-phase working mode.
S2: the three-phase PFC power module controls the single-phase working mode to work in a rectification state or an inversion state according to a control signal; or controlling the three-phase working mode to work in a rectification state or an inversion state; and the commercial power input from the AC power network side is rectified and then positive and negative bus voltages are output to the DC side filtering module, or the DC side DC voltage is inverted and then AC voltage is output to the AC power network side.
S3: and the direct current side filtering module filters the positive and negative bus voltages and outputs the filtered positive and negative bus voltages to the direct current side.
Preferably, in one exemplary embodiment, when the PFC circuit is started, the third switch RL14 is opened by adopting a surge current suppression strategy, and the three-phase PFC power module 400 is connected to the dc-side filtering module 500 through the first resistor R1; when the PFC circuit operates in a single-phase or three-phase operation mode, the third switch RL14 is closed, and the three-phase PFC power module 400 is conducted with the dc-side filtering module 500. The equivalent circuit diagram at this time can be seen in fig. 8 and/or fig. 9.
Preferably, in an exemplary embodiment, in step S2, the method for controlling the single-phase PFC power module to operate in a rectification state or an inversion state according to a control signal includes:
in a single-phase working mode, the control signal comprises a single-pole frequency multiplication SPWM modulation mode; when the single-phase working mode works in a rectification state, the control signal controls the first switching tube Q1, the second switching tube Q2, the fifth switching tube Q5 and the sixth switching tube Q6 to convert the single-phase alternating current on the alternating current power grid side 100 into direct current/high-voltage direct current; and the output voltage of the dc circuit side 200 is adjusted by changing the duty ratio of the first switching tube Q1, the second switching tube Q2, the fifth switching tube Q5 and the sixth switching tube Q6. The purpose of input side power factor correction can also be achieved. When the PFC circuit operates in an inversion state of a single-phase operation mode, the single-pole frequency-doubling SPWM modulation method adjusts duty ratios of the first switching tube Q1, the second switching tube Q2, the fifth switching tube Q5, and the sixth switching tube Q6, inverts the dc power on the dc power side 200 into a single-phase ac power, and transmits the single-phase ac power to the ac power grid side 100. Further, by adjusting the duty ratios of the first switching tube Q1, the second switching tube Q2, the fifth switching tube Q5 and the sixth switching tube Q6, the PFC circuit can be made to output a single-phase ac voltage in an inverted manner under different ac output loads and different dc input voltage effective values. Are not described in detail, but are within the scope of the invention.
With such a configuration, when the PFC circuit operates in the single-phase operation mode, the first switching tube Q1, the second switching tube Q2, the fifth switching tube Q5 and the sixth switching tube Q6 all operate in a high-frequency state, so that compared with the prior art, the PFC circuit compatible with single-phase and three-phase ac inputs provided by the present invention does not need to consider a power frequency tube design.
Preferably, in one embodiment, in step S2, the method for controlling the three-phase operation mode to operate in the rectification state or the inversion state includes:
under a three-phase working mode, the control signal comprises a voltage space vector modulation mode; and the duty ratios of the first switching tube Q1 to the sixth switching tube Q6 are adjusted through the voltage space vector modulation mode, and the three-phase working mode is controlled to work in a rectification state or an inversion state. This enables energy to flow from the dc power supply side 200 to the ac power supply side 100.
Preferably, in one embodiment, the first to sixth switching tubes Q1 to Q6 operate in a PWM mode in either the single-phase operation mode or the three-phase operation mode.
Based on the same inventive concept, a further embodiment of the present invention further provides a charger, which includes the PFC circuit compatible with single-phase and three-phase ac inputs described in any of the above embodiments. The charger includes but is not limited to a vehicle-mounted charger.
Since the charger provided by this embodiment is the same inventive concept as the PFC circuit compatible with single-phase and three-phase ac inputs provided by any of the above embodiments, the charger at least has the same beneficial effects as the charger, and thus, the charger is not described in detail.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic 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, structures, materials, 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.
In summary, the above embodiments have described in detail different configurations of the PFC circuit, the control method and the charger that are compatible with single-phase and three-phase ac inputs, and it should be understood that the above description is only for describing the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention in any way.

Claims (15)

1. A PFC circuit compatible with single-phase and three-phase AC input is connected with an AC power grid side and a DC power grid side, and is characterized in that the PFC circuit comprises a relay module, a three-phase PFC power module and a DC side filtering module;
the first phase and the second phase of the alternating current power grid side are respectively connected with the first input end and the second input end of the three-phase PFC power module, and the zero line or the third phase of the alternating current power grid side is connected with the third input end of the three-phase PFC power module through the relay module;
the relay module is configured to: controlling the on-off state of an internal switch according to a driving signal, and conducting the zero line and a third input end of the three-phase PFC power module to enter a single-phase working mode; or conducting a third phase of the alternating current power grid side and a third input end of the three-phase PFC power module to enter a three-phase working mode;
in accordance with control signals, the three-phase PFC power module is configured to: controlling the single-phase working mode to work in a rectification state or an inversion state;
or
Controlling the three-phase working mode to work in a rectification state or an inversion state;
the output end of the three-phase PFC power module is connected with the direct current circuit side through the direct current side filtering module.
2. The PFC circuit of claim 1 wherein the relay module comprises a single pole double throw switch;
the fixed end of the single-pole double-throw switch is connected with a third input end of the three-phase PFC power module;
according to the driving signal, the moving end of the single-pole double-throw switch is configured to:
conducting the zero line and a third input end of the three-phase PFC power module to enter a single-phase working mode;
or
And conducting a third phase on the AC power grid side and a third input end of the three-phase PFC power module to enter a three-phase working mode.
3. The PFC circuit of claim 1 compatible with single-phase and three-phase alternating current inputs, wherein the relay module comprises a first switch and a second switch;
one end of the first switch is connected with the zero line, and the other end of the first switch is connected with a third input end of the three-phase PFC power module;
one end of the second switch is connected with a third phase on the alternating current power grid side, and the other end of the second switch is connected with a third input end of the three-phase PFC power module;
in accordance with the drive signal, the first switch and the second switch are configured to:
closing the first switch and opening the second switch, and conducting the zero line and a third input end of the three-phase PFC power module to enter a single-phase working mode;
and opening the first switch and closing the second switch, and conducting a third phase on the alternating current power grid side and a third input end of the three-phase PFC power module to enter a three-phase working mode.
4. The PFC circuit of claim 1, wherein the three-phase PFC power module comprises a three-phase full bridge switching circuit, the three-phase full bridge switching circuit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the first switching tube, the third switching tube and the fifth switching tube respectively form three upper bridge arms, and drain electrode output ends of the three upper bridge arms are connected and connected with the anode of the direct current side filtering module;
the second switching tube, the fourth switching tube and the sixth switching tube respectively form three lower bridge arms, and source electrode output ends of the three lower bridge arms are connected and connected with the negative electrode of the direct current side filtering module;
defining outgoing lines at the joints of the three upper bridge arms and the three lower bridge arms as a first outgoing line, a second outgoing line and a third outgoing line respectively;
the first outgoing line is connected with a first phase of the alternating current power grid side, the second outgoing line is connected with a second phase of the alternating current power grid side, and the third outgoing line is connected with the zero line or a third phase of the alternating current power grid side through the relay module.
5. The PFC circuit of claim 4 wherein the three-phase PFC power module further comprises a first inductor, a second inductor, and a third inductor;
one end of the first inductor is connected with a first phase of the alternating current power grid side, and the other end of the first inductor is connected with the first outgoing line;
one end of the second inductor is connected with a second phase on the alternating current power grid side, and the other end of the second inductor is connected with the second outgoing line;
one end of the third inductor is connected with the third phase of the zero line or the alternating current power grid side through the relay module, and the other end of the third inductor is connected with the third outgoing line.
6. The PFC circuit compatible with single-phase and three-phase alternating-current input according to any one of claims 4-5, wherein the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and/or the sixth switching tube comprise MOSFET tubes and/or IGBTs.
7. The PFC circuit of claim 4, wherein the DC-side filtering module comprises a first capacitor and a second capacitor connected in series;
the positive electrode of the first capacitor is connected with the drain electrode output ends of the three upper bridge arms, and the negative electrode of the first capacitor is connected with the positive electrode of the second capacitor;
and the negative electrode of the second capacitor is connected with the source electrode output ends of the three lower bridge arms.
8. The PFC circuit compatible with single-phase and three-phase AC inputs of claim 4, further comprising a rush current suppression module, wherein the three-phase PFC power module is connected to the DC side filtering module via the rush current suppression module.
9. The PFC circuit of claim 8 wherein the inrush current suppression module comprises a third switch and a first resistor connected in parallel;
one end of the third switch is connected with one end of the first resistor to form a first connection end of the surge current suppression module, and one end of the third switch is connected with the other end of the first resistor to form a second connection end of the surge current suppression module;
the first connecting end of the impact current suppression module is connected with the drain electrode output ends of the three upper bridge arms, and the second connecting end of the impact current suppression module is connected with the anode of the direct current side filter module;
or
The first connecting end of the impact current suppression module is connected with the source electrode output ends of the three lower bridge arms, and the second connecting end of the impact current suppression module is connected with the negative electrode of the direct current side filter module.
10. A control method using the PFC circuit compatible with single-phase and three-phase ac inputs of claim 1, comprising:
s1: the relay module controls the on-off state of an internal switch according to a driving signal, and conducts the zero line and a third input end of the three-phase PFC power module to enter a single-phase working mode; or conducting a third phase of the alternating current power grid side and a third input end of the three-phase PFC power module to enter a three-phase working mode;
s2: the three-phase PFC power module controls the single-phase working mode to work in a rectification state or an inversion state according to a control signal; or controlling the three-phase working mode to work in a rectification state or an inversion state;
rectifying the commercial power input from the AC power grid side and then outputting positive and negative bus voltages to the DC side filtering module, or inverting the DC voltage at the DC side and then outputting AC voltage to the AC power grid side;
s3: and the direct current side filtering module filters the positive and negative bus voltages and outputs the filtered positive and negative bus voltages to the direct current side.
11. The method of claim 10, wherein the PFC circuit further comprises a rush current suppression module, the rush current suppression module comprising a third switch and a first resistor connected in parallel;
the three-phase PFC power module is connected with the direct current side filtering module through the inrush current suppression module;
when the PFC circuit is started, the third switch is switched off, and the three-phase PFC power module is connected with the direct current side filtering module through the first resistor;
when the PFC circuit works in a single-phase or three-phase working mode, the third switch is closed, and the three-phase PFC power module is conducted with the direct-current side filtering module.
12. The method as claimed in claim 10, wherein the three-phase PFC power module comprises a three-phase full bridge switching circuit, the three-phase full bridge switching circuit comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube;
the first switching tube, the third switching tube and the fifth switching tube respectively form three upper bridge arms, and drain electrode output ends of the three upper bridge arms are connected and connected with the anode of the direct current side filtering module;
the second switching tube, the fourth switching tube and the sixth switching tube respectively form three lower bridge arms, and source electrode output ends of the three lower bridge arms are connected and connected with the negative electrode of the direct current side filtering module;
defining outgoing lines at the joints of the three upper bridge arms and the three lower bridge arms as a first outgoing line, a second outgoing line and a third outgoing line respectively;
the first outgoing line is connected with a first phase on the alternating current power grid side, the second outgoing line is connected with a second phase on the alternating current power grid side, and the third outgoing line is connected with the zero line or a third phase on the alternating current power grid side through the relay module;
in step S2, the method for controlling the single-phase PFC power module to operate in a rectification state or an inversion state according to the control signal includes:
in a single-phase working mode, the control signal comprises a single-pole frequency multiplication SPWM modulation mode;
when the single-phase working mode works in a rectification state, the control signal controls the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube to convert the single-phase alternating current on the alternating current power grid side into direct current; the duty ratio of the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube is changed to regulate the output voltage of the direct current circuit side;
when the single-phase working mode works in an inversion state, the control signal adjusts duty ratios of the first switching tube, the second switching tube, the fifth switching tube and the sixth switching tube, the direct current at the direct current side is inverted to the single-phase alternating current, and the single-phase alternating current is transmitted to the alternating current power grid side.
13. The method as claimed in claim 12, wherein the step S2 is a method for controlling the three-phase operation mode to operate in a rectification state or an inversion state, and the method comprises:
under a three-phase working mode, the control signal comprises a voltage space vector modulation mode;
and adjusting the duty ratios of the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube through the voltage space vector modulation mode, and controlling the three-phase working mode to work in a rectification state or an inversion state.
14. A control method for a PFC circuit according to any one of claims 12 to 13, wherein the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are all operated in a PWM mode in the single-phase operation mode or the three-phase operation mode.
15. A charger characterized by comprising a PFC circuit compatible with single-phase and three-phase ac inputs according to any one of claims 1 to 9.
CN202011363465.5A 2020-11-27 2020-11-27 PFC circuit compatible with single-phase and three-phase alternating-current input, control method and charger Pending CN112636577A (en)

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CN114337208A (en) * 2021-12-21 2022-04-12 西南交通大学 PFC circuit compatible with single-phase and three-phase alternating-current input and control method
WO2022110891A1 (en) * 2020-11-27 2022-06-02 联合汽车电子有限公司 Pfc circuit with single-phase and three-phase alternating-current inputs being compatible, and control method and charger
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