WO2022110891A1

WO2022110891A1 - Pfc circuit with single-phase and three-phase alternating-current inputs being compatible, and control method and charger

Info

Publication number: WO2022110891A1
Application number: PCT/CN2021/111058
Authority: WO
Inventors: 闻伟; 王燕彬; 袁文; 王小昆; 刘少伟
Original assignee: 联合汽车电子有限公司
Priority date: 2020-11-27
Filing date: 2021-08-05
Publication date: 2022-06-02
Also published as: CN112636577A

Abstract

Provided are a PFC circuit with single-phase and three-phase alternating-current inputs being compatible, which circuit can be used for a vehicle-mounted electric motor, and a control method and a charger. The PFC circuit is used for connecting an alternating-current power grid 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 filter module. Two phases of the alternating-current power grid side are respectively connected to two input ends of the three-phase PFC power module, and a null line, or a third phase of the alternating-current power grid side is connected to a third input end of the three-phase PFC power module by means of 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 respectively work in a rectification state or an inversion state. The number of relays used by the PFC circuit provided in the present invention is smaller, such that the cost, and the volume of a circuit board can be reduced. Moreover, regardless of a sudden change from a three-phase input to a single-phase input or a sudden change from a single-phase input to a three-phase input, a relay module does not short circuit a power grid circuit, thereby achieving low failure risk.

Description

兼容单相和三相交流输入的PFC电路、控制方法及充电机PFC circuit, control method and charger compatible with single-phase and three-phase AC input

技术领域technical field

本发明涉及功率电路技术领域，尤其是涉及一种兼容单相和三相交流输入的PFC电路、控制方法及充电机。The invention relates to the technical field of power circuits, in particular to a PFC circuit compatible with single-phase and three-phase AC input, a control method and a charger.

背景技术Background technique

伴随着电动汽车的日益普及应用，车载充电机作为一种常见的电力电子变换装置，其对电网造成的谐波污染及带来的电网无功功率的增加，日益成为本领域技术人员需要解决的问题之一。因此，为了降低车载充电机电网侧交流电流的谐波含量，以及使车载充电机电网侧电流与电网电压同相位，通常采用PFC电路(功率因数校正)以减小无功功率。与此同时，常见的市电供电输入，由于基础设施的限制，有单相和三相两种典型配电。因此，为了提高车载充电机的兼容性，对用电装置提出了兼容单/三相交流输入的需求；进一步地，随着智能电网技术的发展，用户对车载动力电池回馈负载技术(V2L)、车车互充技术(V2V)需求。以上种种，均成为车载充电机PFC电路需要具备的基本功能。With the increasing popularity and application of electric vehicles, as a common power electronic conversion device, on-board chargers cause harmonic pollution to the power grid and increase the reactive power of the power grid. one of the problems. Therefore, in order to reduce the harmonic content of the AC current on the grid side of the on-board charger and make the grid-side current of the on-board charger in the same phase as the grid voltage, a PFC circuit (power factor correction) is usually used to reduce reactive power. At the same time, the common mains power supply input has two typical power distributions, single-phase and three-phase, due to the limitation of infrastructure. Therefore, in order to improve the compatibility of on-board chargers, the demand for compatible single/three-phase AC input is put forward for electrical devices; further, with the development of smart grid technology, users are more interested in on-board power battery feedback load technology (V2L), Vehicle-to-vehicle charging technology (V2V) demand. All of the above have become the basic functions that the PFC circuit of the on-board charger needs to have.

现有技术中，传统兼容单/三相交流输入的PFC电路，如图1所示，该方案通过控制继电器的开关，可使电路分别工作在单相和三相模式下，实现PFC电路的单、三相兼容。其工作原理大致如下：当继电器RL01、RL03、RL05断开，继电器RL02、RL04闭合时，PFC电路工作在三相模式，通过控制开关管Q1～Q6的占空比，既可以实现能量从交流电网侧转移到直流电路侧(整流侧)，也可以使能量从直流电路侧转移到交流电网侧(逆变侧)。当继电器RL01、RL04断开，继电器RL02、RL03、RL05闭合时，PFC电路工作在单相模式，可等效为两相交错并联的Boost电路，其工作在整流状态下时，通过控制算法使电感L1、L2的电流交错180度，可降低单相电网输入侧电流的谐波含量。同时，也可以通过控制开关管Q1～Q4的占空比，使得电路工作在逆变状态下，从而使能量从直流电路侧逆变回电网。In the prior art, the traditional PFC circuit compatible with single/three-phase AC input, as shown in Figure 1, this solution can make the circuit work in single-phase and three-phase mode respectively by controlling the switch of the relay, so as to realize the single-phase and three-phase mode of the PFC circuit. , Three-phase compatible. Its working principle is roughly as follows: when the relays RL01, RL03, and RL05 are disconnected, and the relays RL02 and RL04 are closed, the PFC circuit works in three-phase mode. The side is transferred to the DC circuit side (rectifier side), and the energy can also be transferred from the DC circuit side to the AC grid side (inverter side). When the relays RL01 and RL04 are disconnected and the relays RL02, RL03 and RL05 are closed, the PFC circuit works in single-phase mode, which can be equivalent to a two-phase staggered parallel boost circuit. The currents of L1 and L2 are staggered by 180 degrees, which can reduce the harmonic content of the current on the input side of the single-phase power grid. At the same time, the duty ratio of the switching tubes Q1-Q4 can also be controlled to make the circuit work in the inverter state, so that the energy is inverted from the DC circuit side and returned to the power grid.

然而，传统兼容单/三相输入的PFC电路存在如下缺陷：However, traditional PFC circuits compatible with single/three-phase input have the following drawbacks:

1.为了抑制PFC电路的启动冲击电流并实现三相/单相工作模式的切换，传统兼容单/三相输入的PFC电路需要五个继电器，继电器数量多，体积较大且成本较高。1. In order to suppress the starting inrush current of the PFC circuit and realize the switching of three-phase/single-phase working mode, the traditional PFC circuit compatible with single/three-phase input needs five relays, which are large in number, large in size and high in cost.

2.失效风险高：当输入由单相突然变成三相输入时，U/V之间的线电压被继电器RL03短路，容易造成继电器RL03失效。具体地，如附图2所示，当传统兼容单/三相输入的PFC电路工作在正常单相充电模式时，继电器RL02、RL03、RL05闭合，继电器RL01、RL04断开。此时，若交流电网侧电压突然由单相变为三相，继电器RL03仍处于闭合状态，U、V相之间存在如图3所示的电流回路，瞬时短路大电流通过继电器RL03，使得继电器RL03在输入电网电压突变时极易失效。2. High risk of failure: When the input suddenly changes from single-phase to three-phase input, the line voltage between U/V is short-circuited by relay RL03, which is easy to cause relay RL03 to fail. Specifically, as shown in FIG. 2, when the traditional PFC circuit compatible with single/three-phase input works in the normal single-phase charging mode, the relays RL02, RL03, and RL05 are closed, and the relays RL01 and RL04 are open. 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 the closed state, and there is a current loop between the U and V phases as shown in Figure 3, and the instantaneous short-circuit high current passes through the relay RL03, making the relay RL03 is very easy to fail when the input grid voltage suddenly changes.

3.EMI噪声较大：参见附图2，单相模式下N线上无PFC电感抑制全桥侧高频电流噪声(比如共模噪声)，因此，高频电流容易通过N线传导至交流电网侧，增加了交流电网侧的EMI噪声。3. The EMI noise is relatively large: see Figure 2. In single-phase mode, there is no PFC inductor on the N line to suppress high-frequency current noise (such as common mode noise) on the full-bridge side. Therefore, the high-frequency current is easily conducted to the AC power grid through the N line. side, increasing the EMI noise on the AC grid side.

因此，如何提供一种兼容单相和三相交流输入的PFC电路，以克服传统兼容单/三相交流输入的PFC电路存在的缺陷，日益成为本领域技术人员亟待解决的技术问题之一。Therefore, how to provide a PFC circuit compatible with single-phase and three-phase AC input to overcome the defects of the traditional single-phase/three-phase AC input compatible PFC circuit has increasingly become one of the technical problems to be solved urgently by those skilled in the art.

需要说明的是，公开于该发明背景技术部分的信息仅仅旨在加深对本发明一般背景技术的理解，而不应当被视为承认或以任何形式暗示该信息构成已为本领域技术人员所公知的现有技术。It should be noted that the information disclosed in this Background of the Invention section is only intended to deepen the understanding of the general background of the present invention, and should not be construed as an acknowledgement or implied in any form that the information constitutes already known to those skilled in the art current technology.

发明内容SUMMARY OF THE INVENTION

本发明的目的在于针对现有技术的不足，提供一种兼容单相和三相交流输入的PFC电路、控制方法及充电机，以节省继电器资源，降低PFC电路的体积和成本，降低继电器失效风险。The purpose of the present invention is to provide a PFC circuit compatible with single-phase and three-phase AC input, a control method and a charger for the deficiencies of the prior art, so as to save relay resources, reduce the volume and cost of the PFC circuit, and reduce the risk of relay failure .

为实现上述目的，本发明通过以下技术方案予以实现：一种兼容单相和三相交流输入的PFC电路，连接交流电网侧和直流电路侧，所述PFC电路包括继电器模块、三相PFC功率模块和直流侧滤波模块；In order to achieve the above object, the present invention is achieved through the following technical solutions: a PFC circuit compatible with single-phase and three-phase AC input, connecting the AC grid side and the DC circuit side, the PFC circuit includes a relay module, a three-phase PFC power module and DC side filter module;

所述交流电网侧的第一相和第二相分别连接所述三相PFC功率模块第一输入端和第二输入端，零线或所述交流电网侧的第三相经由所述继电器模块连接所述三相PFC功率模块的第三输入端；The first phase and the second phase on the AC grid side are respectively connected to the first input terminal and the second input terminal of the three-phase PFC power module, and the neutral line or the third phase on the AC grid side is connected via the relay module the third input end of the three-phase PFC power module;

所述继电器模块被配置为：根据驱动信号控制内部开关的通断状态，将所述零线与所述三相PFC功率模块的第三输入端导通以进入单相工作模式；或将所述交流电网侧的第三相与所述三相PFC功率模块的第三输入端导通以进入三相工作模式；The relay module is configured to: control the on-off state of the internal switch according to the driving signal, and conduct the neutral line and the third input terminal of the three-phase PFC power module to enter the single-phase working mode; The third phase on the AC grid side is connected to the third input end of the three-phase PFC power module to enter the three-phase working mode;

根据控制信号，所述三相PFC功率模块被配置为：控制所述单相工作模式工作在整流状态或逆变状态；According to the control signal, the three-phase PFC power module is configured to: control the single-phase working mode to work in a rectifying state or an inverting state;

或or

控制所述三相工作模式工作在整流状态或逆变状态；controlling the three-phase working mode to work in a rectifying state or an inverting state;

所述三相PFC功率模块的输出端经由所述直流侧滤波模块连接所述直流电路侧。The output end of the three-phase PFC power module is connected to the DC circuit side via the DC side filter module.

可选地，所述继电器模块包括一单刀双掷开关；Optionally, the relay module includes a SPDT switch;

所述单刀双掷开关的不动端连接所述三相PFC功率模块的第三输入端；The stationary end of the SPDT switch is connected to the third input end of the three-phase PFC power module;

根据所述驱动信号，所述单刀双掷开关的动端被配置为：According to the drive signal, the moving end of the SPDT switch is configured as:

导通所述零线与所述三相PFC功率模块的第三输入端以进入单相工作模式；turning on the neutral line and the third input end of the three-phase PFC power module to enter the single-phase working mode;

或or

导通所述交流电网侧的第三相与所述三相PFC功率模块的第三输入端以进入三相工作模式。The third phase on the AC grid side and the third input terminal of the three-phase PFC power module are turned on to enter the three-phase working mode.

可选地，所述继电器模块包括第一开关和第二开关；Optionally, the relay module includes a first switch and a second switch;

其中，所述第一开关的一端与所述零线连接，所述第一开关的另一端与所述三相PFC功率模块的第三输入端连接；Wherein, one end of the first switch is connected to the neutral line, and the other end of the first switch is connected to the third input end of the three-phase PFC power module;

所述第二开关的一端与所述交流电网侧的第三相连接，所述第二开关的另一端与所述三相PFC功率模块的第三输入端连接；One end of the second switch is connected to the third phase on the AC grid side, and the other end of the second switch is connected to the third input end of the three-phase PFC power module;

根据所述驱动信号，所述第一开关和所述第二开关被配置为：According to the drive signal, the first switch and the second switch are configured to:

闭合所述第一开关并断开所述第二开关，导通所述零线与所述三相PFC功率模块的第三输入端以进入单相工作模式；closing the first switch and opening the second switch, and turning on the neutral line and the third input terminal of the three-phase PFC power module to enter the single-phase working mode;

断开所述第一开关并闭合所述第二开关，导通所述交流电网侧的第三相与所述三相PFC功率模块的第三输入端以进入三相工作模式。The first switch is opened and the second switch is closed, and the third phase on the AC grid side and the third input terminal of the three-phase PFC power module are turned on to enter the three-phase working mode.

可选地，所述三相PFC功率模块包括一三相全桥开关电路，所述三相全桥开关电路包括第一开关管、第二开关管、第三开关管、第四开关管、第五开关管和第六开关管；Optionally, the three-phase PFC power module includes a three-phase full-bridge switch circuit, and the three-phase full-bridge switch circuit includes a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor, and a third switch transistor. Five switch tubes and sixth switch tubes;

所述第一开关管、所述第三开关管和所述第五开关管分别组成三个上桥臂，三个所述上桥臂的漏极输出端相连并连接所述直流侧滤波模块的正极；The first switch tube, the third switch tube and the fifth switch tube respectively form three upper bridge arms, and the drain output ends of the three upper bridge arms are connected and connected to the DC side filter module. positive electrode;

所述第二开关管、所述第四开关管和所述第六开关管分别组成三个下桥臂，三个所述下桥臂的源极输出端相连并连接所述直流侧滤波模块的负极；The second switch tube, the fourth switch tube and the sixth switch tube respectively form three lower bridge arms, and the source output ends of the three lower bridge arms are connected and connected to the DC side filter module. negative electrode;

定义所述三个上桥臂和所述三个下桥臂的连接处的引出线分别为第一引出线、第二引出线和第三引出线；Define the lead wires at the connection of the three upper bridge arms and the three lower bridge arms as the first lead wire, the second lead wire and the third lead wire;

所述第一引出线与所述交流电网侧的第一相连接，所述第二引出线与所述交流电网侧的第二相连接，所述第三引出线经由所述继电器模块与所述零线或所述交流电网侧的第三相连接。The first lead wire is connected to the first phase on the AC grid side, the second lead wire is connected to the second phase on the AC grid side, and the third lead wire is connected to the Neutral or third phase connection on the AC grid side.

可选地，所述三相PFC功率模块还包括第一电感、第二电感和第三电感；Optionally, the three-phase PFC power module further includes a first inductor, a second inductor and a third inductor;

所述第一电感的其中一端与所述交流电网侧的第一相连接，所述第一电感的另外一端与所述第一引出线连接；One end of the first inductor is connected to the first phase on the AC grid side, and the other end of the first inductor is connected to the first lead wire;

所述第二电感的其中一端与所述交流电网侧的第二相连接，所述第二电感的另外一端与所述第二引出线连接；One end of the second inductor is connected to the second phase on the AC grid side, and the other end of the second inductor is connected to the second lead wire;

所述第三电感的其中一端经由所述继电器模块与所述零线或所述交流电网侧的第三相连接，所述第三电感的另外一端与所述第三引出线连接。One end of the third inductor is connected to the neutral line or the third phase on the AC grid side via the relay module, and the other end of the third inductor is connected to the third lead wire.

可选地，所述第一开关管、所述第二开关管、所述第三开关管、所述第四开关管、所述第五开关管和/或所述第六开关管包括MOSFET管和/或IGBT。Optionally, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the fifth switch transistor and/or the sixth switch transistor include MOSFET transistors and/or IGBTs.

可选地，所述直流侧滤波模块包括串联连接的第一电容和第二电容；Optionally, the DC side filter module includes a first capacitor and a second capacitor connected in series;

其中，所述第一电容的正极连接三个所述上桥臂的漏极输出端，所述第一电容的负极连接所述第二电容的正极；Wherein, the positive electrode of the first capacitor is connected to the drain output terminals of the three upper bridge arms, and the negative electrode of the first capacitor is connected to the positive electrode of the second capacitor;

所述第二电容的负极连接三个所述下桥臂的源极输出端。The negative electrode of the second capacitor is connected to the source output terminals of the three lower bridge arms.

可选地，还包括冲击电流抑制模块，所述三相PFC功率模块经由所述冲击电流抑制模块连接所述直流侧滤波模块。Optionally, an inrush current suppression module is also included, and the three-phase PFC power module is connected to the DC side filter module via the inrush current suppression module.

可选地，所述冲击电流抑制模块包括一并联连接的第三开关和第一电阻；Optionally, the inrush current suppression module includes a third switch and a first resistor connected in parallel;

所述第三开关的其中一端与所述第一电阻的其中一端连接形成所述冲击电流抑制模块的第一连接端，所述第三开关的其中一端与所述第一电阻的另外一端连接形成所述冲击电流抑制模块的第二连接端；One end of the third switch is connected to one end of the first resistor to form a first connection end of the inrush current suppression module, and one end of the third switch is connected to the other end of the first resistor to form a first connection end a second connection end of the inrush current suppression module;

所述冲击电流抑制模块的第一连接端连接三个所述上桥臂的漏极输出端，所述冲击电流流抑制模块的第二连接端连接所述直流侧滤波模块的正极；The first connection end of the inrush current suppression module is connected to the drain output ends of the three upper bridge arms, and the second connection end of the inrush current suppression module is connected to the positive electrode of the DC side filter module;

或or

所述冲击电流抑制模块的第一连接端连接三个所述下桥臂的源极输出端，所述冲击电流流抑制模块的第二连接端所述直流侧滤波模块的负极。The first connection end of the inrush current suppression module is connected to the source output ends of the three lower bridge arms, and the second connection end of the inrush current suppression module is connected to the negative electrode of the DC side filter module.

基于同一发明构思，本发明还提供了一种基于上述任一项所述的兼容单相和三相交流输入的PFC电路的控制方法，包括：Based on the same inventive concept, the present invention also provides a control method based on any one of the above-mentioned PFC circuits compatible with single-phase and three-phase AC input, including:

S1：所述继电器模块根据驱动信号控制内部开关的通断状态，将所述零线与所述三相PFC功率模块的第三输入端导通以进入单相工作模式；或将所述交流电网侧的第三相与所述三相PFC功率模块的第三输入端导通以进入三相工作模式；S1: The relay module controls the on-off state of the internal switch according to the driving signal, and conducts the neutral line and the third input terminal of the three-phase PFC power module to enter the single-phase working mode; The third phase of the side is connected with the third input end of the three-phase PFC power module to enter the three-phase working mode;

S2：所述三相PFC功率模块根据控制信号控制所述单相工作模式工作在整流状态或逆变状态；或控制所述三相工作模式工作在整流状态或逆变状态；S2: the three-phase PFC power module controls the single-phase operation mode to work in a rectification state or an inverter state according to a control signal; or controls the three-phase operation mode to work in a rectifier state or an inverter state;

并将所述交流电网侧输入的市电整流后输出正负母线电压至所述直流侧滤波模块，或将直流电路侧直流电压逆变后输出交流电压至所述交流电网侧；rectifying the mains input from the AC grid side and then outputting the positive and negative busbar voltages to the DC side filter module, or inverting the DC circuit side DC voltage and outputting the AC voltage to the AC grid side;

S3：所述直流侧滤波模块对所述正负母线电压进行滤波后输出给所述直流电路侧。S3: The DC side filter module filters the positive and negative bus voltages and outputs the filtered voltages to the DC circuit side.

可选地，所述PFC电路还包括冲击电流抑制模块，所述冲击电流抑制模块包括并联连接的第三开关和第一电阻；Optionally, the PFC circuit further includes an inrush current suppression module, and the inrush current suppression module includes a third switch and a first resistor connected in parallel;

所述三相PFC功率模块经由所述冲击电流抑制模块连接所述直流侧滤波模块；the three-phase PFC power module is connected to the DC side filter module via the inrush current suppression module;

在启动所述PFC电路时，断开所述第三开关，所述三相PFC功率模块经由所述第一电阻连接所述直流侧滤波模块；When starting the PFC circuit, the third switch is disconnected, and the three-phase PFC power module is connected to the DC side filter module via the first resistor;

当所述PFC电路工作在单相或三相工作模式时，闭合所述第三开关，所述三相PFC功率模块与所述直流侧滤波模块导通。When the PFC circuit operates in a single-phase or three-phase operation mode, the third switch is closed, and the three-phase PFC power module and the DC side filter module are connected.

所述第一引出线与所述交流电网侧的第一相连接，所述第二引出线与所述交流电网侧的第二相连接，所述第三引出线经由所述继电器模块与所述零线或所述交流电网侧的第三相连接；The first lead wire is connected to the first phase on the AC grid side, the second lead wire is connected to the second phase on the AC grid side, and the third lead wire is connected to the neutral or third phase connection on the AC grid side;

步骤S2中，所述三相PFC功率模块根据控制信号控制所述单相工作模式工作在整流状态或逆变状态的方法，包括：In step S2, the method for the three-phase PFC power module to control the single-phase operation mode to work in a rectification state or an inverter state according to a control signal, includes:

在单相工作模式下，所述控制信号包括单极倍频SPWM调制方式；In the single-phase working mode, the control signal includes a unipolar frequency-doubling SPWM modulation mode;

当所述单相工作模式工作在整流状态时，所述控制信号控制所述第一开关管、所述第二开关管、所述第五开关管和所述第六开关管，将所述交流电网侧的单相交流电转化为直流电；并通过改变所述第一开关管、所述第二开关管、所述第五开关管和所述第六开关管的占空比，调节所述直流电路侧的输出电压；When the single-phase working mode works in the rectification state, the control signal controls the first switch, the second switch, the fifth switch and the sixth switch to convert the AC The single-phase alternating current on the grid side is converted into direct current; and the DC circuit is adjusted by changing the duty ratio of the first switch tube, the second switch tube, the fifth switch tube and the sixth switch tube side output voltage;

当所述单相工作模式工作在逆变状态时，所述控制信号调节所述第一开关管、所述第二开关管、所述第五开关管和所述第六开关管的占空比，将所述直流电路侧的直流电逆变至单相交流电并输送至所述交流电网侧。When the single-phase working mode works in an inverter state, the control signal adjusts the duty ratio of the first switch, the second switch, the fifth switch and the sixth switch , inverting the DC power on the DC circuit side to a single-phase AC power and sending it to the AC grid side.

可选地，步骤S2中，控制所述三相工作模式工作在整流状态或逆变状态的方法，包括：Optionally, in step S2, the method for controlling the three-phase working mode to work in a rectifying state or an inverting state includes:

在三相工作模式下，所述控制信号包括电压空间矢量调制方式；In the three-phase working mode, the control signal includes a voltage space vector modulation mode;

通过所述电压空间矢量调制方式调节所述第一开关管、所述第二开关管、所述第三开关管、所述第四开关管、所述第五开关管和所述第六开关管的占空比，控制所述三相工作模式工作在整流状态或逆变状态的方法。The first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch are adjusted by the voltage space vector modulation method A method of controlling the three-phase working mode to work in a rectifying state or an inverting state.

可选地，在所述单相工作模式或所述三相工作模式下，所述第一开关管、所述第二开关管、所述第三开关管、所述第四开关管、所述第五开关管和所述第六开关管均工作在PWM模式下。Optionally, in the single-phase operating mode or the three-phase operating mode, the first switch transistor, the second switch transistor, the third switch transistor, the fourth switch transistor, the Both the fifth switch tube and the sixth switch tube work in the PWM mode.

基于同一发明构思，本发明还提供了一种充电机，包括上述任一项所述的兼容单相和三相交流输入的PFC电路。Based on the same inventive concept, the present invention also provides a charger, including the PFC circuit compatible with single-phase and three-phase AC input described in any of the above.

与现有技术相比，本发明提供的一种兼容单相和三相交流输入的PFC电路，具有如下有益效果：Compared with the prior art, a PFC circuit compatible with single-phase and three-phase AC input provided by the present invention has the following beneficial effects:

本发明提供的一种兼容单相和三相交流输入的PFC电路，连接交流电网侧和直流电路侧。所述PFC电路包括继电器模块、三相PFC功率模块和直流侧滤波模块。所述交流电网侧的第一相和第二相分别连接所述三相PFC功率模块第一输入端和第二输入端，零线或所述交流电网侧的第三相经由所述继电器模块连接所述三相PFC功率模块的第三输入端。所述继电器模块被配置为：根据驱动信号控制内部开关的通断状态，将所述零线与所述三相PFC功率模块的第三输入端导通以进入单相工作模式；或将所述交流电网侧的第三相与所述三相PFC功率模块的第三输入端导通以进入三相工作模式。根据控制信号，所述三相PFC功率模块被配置为：控制所述单相工作模式工作在整流状态或逆变状态；或控制所述三相工作模式工作在整流状态或逆变状态；所述三相PFC功率模块的输出端经由所述直流侧滤波模块连接所述直流电路侧。如此配置，本发明提供的所述PFC电路需要的继电器数更少，节约电气元件降低成本及节约资源；进一步地，能够降低PFC电路的布局难度，减小相关电路板的尺寸(比如体积)更便于充电机的装配；再进一步地，由于没有继电器跨接在两相交流电网输入线之间，因此，不管从单相输入突然变为三相输入还是从三相输入突然变为单相输入，都不会发生跨接在两相交流电网之间的继电器短路电网，失效风险低。The invention provides a PFC circuit compatible with single-phase and three-phase AC input, which connects the AC grid side and the DC circuit side. The PFC circuit includes a relay module, a three-phase PFC power module and a DC side filter module. The first phase and the second phase on the AC grid side are respectively connected to the first input terminal and the second input terminal of the three-phase PFC power module, and the neutral line or the third phase on the AC grid side is connected via the relay module the third input terminal of the three-phase PFC power module. The relay module is configured to: control the on-off state of the internal switch according to the driving signal, and conduct the neutral line and the third input terminal of the three-phase PFC power module to enter the single-phase working mode; The third phase on the AC grid side is connected to the third input terminal of the three-phase PFC power module to enter the three-phase working mode. According to the control signal, the three-phase PFC power module is configured to: control the single-phase working mode to work in a rectifying state or an inverting state; or control the three-phase working mode to work in a rectifying state or an inverting state; the The output end of the three-phase PFC power module is connected to the DC circuit side via the DC side filter module. With this configuration, the PFC circuit provided by the present invention requires fewer relays, saves electrical components, reduces costs, and saves resources; further, the layout difficulty of the PFC circuit can be reduced, and the size (such as volume) of the related circuit board can be reduced more It is convenient for the assembly of the charger; further, since there is no relay connected between the input lines of the two-phase AC power grid, whether the single-phase input suddenly changes to the three-phase input or the three-phase input suddenly changes to the single-phase input, There will be no short-circuit grid of relays connected between two-phase AC grids, and the risk of failure is low.

进一步地，无论单相工作模式还是三相工作模式，所述兼容单相和三相交流输入的PFC电路的电感都是对称结构，单相模式下U相和N线上具有电感滤波，因此，高频电流很难通过N线传导至所述交流电网侧，大大降低了交流电网侧的EMI噪声。Further, regardless of single-phase operation mode or three-phase operation mode, the inductance of the PFC circuit compatible with single-phase and three-phase AC input is a symmetrical structure, and in the single-phase mode, there are inductance filtering on the U-phase and N lines. Therefore, It is difficult for the high-frequency current to be conducted to the AC grid side through the N line, which greatly reduces the EMI noise on the AC grid side.

再进一步地，所述PFC电路还包括冲击电流抑制模块，所述冲击电流抑制模块包括第一电阻(热敏电阻)和第三开关，所述直流侧滤波模块包括第一电容和第二电容。所述第三开关断开，所述PFC电路工作在单相工作模式或三相工作模式下，所述第一电阻均可参与所述PFC电路的启动过程，实现所述PFC电路的软启动。所述交流电网侧的单相或三相交流电经所述三相PFC功率模块的电感、开关管和所述冲击电流抑制模块的所述第一电阻后给所述直流侧滤波模块的第一电容和第二电容预充电，所述第一电阻可以很好地限制所述PFC电路启动瞬间的冲击电流，从而避免启动冲击电流过大对功率器件造成损坏。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 filter module includes a first capacitor and a second capacitor. The third switch is turned off, the PFC circuit operates in a single-phase operation mode or a three-phase operation mode, and the first resistor can participate in the startup process of the PFC circuit to realize the soft start of the PFC circuit. The single-phase or three-phase alternating current on the AC grid side is fed to the first capacitor of the DC-side filter module through the inductance, switch tube of the three-phase PFC power module, and the first resistor of the inrush current suppression module. and the second capacitor is pre-charged, the first resistor can well limit the inrush current at the moment of startup of the PFC circuit, so as to avoid damage to the power device caused by excessive startup inrush current.

更进一步地，所述PFC电路的所述三相PFC功率模块还包括所述第一电感、所述第二电感和所述第三电感，无论所述PFC电路处于单相工作模式还是三相工作模式，所述PFC电路的电感都是对称结构，单相模式下U相和N线上具有电感滤波，因此，高频电流很难通过N线传导至所述交流电网侧，大大降低了交流电网侧的EMI噪声。Further, the three-phase PFC power module of the PFC circuit further includes the first inductor, the second inductor and the third inductor, no matter whether the PFC circuit is in a single-phase operation mode or a three-phase operation mode, the inductances of the PFC circuit are all symmetrical structures. In the single-phase mode, the U-phase and N lines have inductance filtering. Therefore, it is difficult for the high-frequency current to be conducted to the AC grid side through the N line, which greatly reduces the AC grid. side EMI noise.

由于本发明提供的一种基于所述兼容单相和三相交流输入的PFC电路的控制方法和充电机，与所述兼容单相和三相交流输入的PFC电路属于同一发明构思，因此至少具有相同的有益效果，在此，不再一一赘述。Since the control method and charger based on the PFC circuit compatible with single-phase and three-phase AC input provided by the present invention belong to the same inventive concept as the PFC circuit compatible with single-phase and three-phase AC input, it has at least The same beneficial effects will not be repeated here.

附图说明Description of drawings

图1为现有技术中兼容单/三相交流输入的PFC电路结构示意图；1 is a schematic structural diagram of a PFC circuit compatible with single/three-phase AC input in the prior art;

图2为图1工作在单相充电时的电路结构示意图；FIG. 2 is a schematic diagram of the circuit structure of FIG. 1 when working in single-phase charging;

图3为图1工作在单相突变为三相时RL3失效回路示意图(以V _VN＞V _UN为例)； Fig. 3 is a schematic diagram of the failure loop of RL3 when the single-phase suddenly becomes three-phase in Fig. 1 (taking V _VN > V _UN as an example);

图4为本发明实施例一提供的兼容单相和三相交流输入的PFC电路的结构示意图；4 is a schematic structural diagram of a PFC circuit compatible with single-phase and three-phase AC input provided by Embodiment 1 of the present invention;

图5为本发明实施例一提供的其中一种兼容单相和三相交流输入的PFC电路的电路示意图；5 is a schematic circuit diagram of a PFC circuit compatible with single-phase and three-phase AC input according to Embodiment 1 of the present invention;

图6为本发明实施例一提供的另外一种兼容单相和三相交流输入的PFC电路的电路示意图；6 is a schematic circuit diagram of another PFC circuit compatible with single-phase and three-phase AC input provided by Embodiment 1 of the present invention;

图7为本发明实施例一提供的又一种兼容单相和三相交流输入的PFC电路的电路示意图；7 is a schematic circuit diagram of another PFC circuit compatible with single-phase and three-phase AC input provided by Embodiment 1 of the present invention;

图8为基于图6单相工作模式下PFC电路启动冲击电流抑制电路示意图(以单相电网正半周为例)；Fig. 8 is a schematic diagram of the start-up rush current suppression circuit of the PFC circuit based on the single-phase working mode of Fig. 6 (taking the positive half cycle of the single-phase power grid as an example);

图9为基于图6三相工作模式下PFC电路启动冲击电流抑制电路示意图(以V _UN＞V _VN＞V _WN时为例)； FIG. 9 is a schematic diagram of the start-up inrush current suppression circuit of the PFC circuit based on the three-phase working mode of FIG. 6 (taking the case of V _UN > V _VN > V _WN as an example);

图10为基于图6的单相工作模式工作在整流状态的等效电路示意图；FIG. 10 is a schematic diagram of an equivalent circuit based on the single-phase operating mode of FIG. 6 operating in a rectified state;

图11为基于图6的单相工作模式工作在逆变状态的等效电路示意图；FIG. 11 is a schematic diagram of an equivalent circuit based on the single-phase operating mode of FIG. 6 operating in an inverter state;

图12为基于图6的三相工作模式工作在整流状态的等效电路示意图；12 is a schematic diagram of an equivalent circuit based on the three-phase operating mode of FIG. 6 working in a rectified state;

图13为基于图6的三相工作模式工作在逆变状态的等效电路示意图；13 is a schematic diagram of an equivalent circuit operating in an inverter state based on the three-phase operating mode of FIG. 6;

图14为本发明实施例二提供的一种基于兼容单相和三相交流输入的PFC电路的控制方法流程示意图；14 is a schematic flowchart of a control method based on a PFC circuit compatible with single-phase and three-phase AC input according to Embodiment 2 of the present invention;

附图标记说明如下：The reference numerals are explained as follows:

100-交流电网侧，200-直流电路侧，300-继电器模块，400-三相PFC功率模块，500-直流侧滤波模块，600-冲击电流抑制模块；100-AC grid side, 200-DC circuit side, 300-Relay module, 400-Three-phase PFC power module, 500-DC side filter module, 600-Inrush current suppression module;

RL11-单刀双掷开关，RL12-第一开关，RL13-第二开关，RL14-第三开关，R1-第一电阻；RL11-SPDT switch, RL12-first switch, RL13-second switch, RL14-third switch, R1-first resistor;

Q1-第一开关管、Q2-第二开关管、Q3-第三开关管，Q4-第四开关管，Q5-第五开关管，Q6-第六开关管；Q1-the first switch tube, Q2-the second switch tube, Q3-the third switch tube, Q4-the fourth switch tube, Q5-the fifth switch tube, Q6-the sixth switch tube;

L1-第一电感，L2-第二电感，L3-第三电感；L1-first inductor, L2-second inductor, L3-third inductor;

C1-第一电容，C2-第二电容。C1-first capacitor, C2-second capacitor.

具体实施方式Detailed ways

为使本发明的目的、优点和特征更加清楚，以下结合附图对本发明提出的一种兼容单相和三相交流输入的PFC电路、控制方法及充电机作进一步详细说明。需说明的是，附图均采用非常简化的形式且均使用非精准的比例，仅用以方便、明晰地辅助说明本发明实施例的目的。应当了解，说明书附图并不一定按比例地显示本发明的具体结构，并且在说明书附图中用于说明本发明某些原理的图示性特征也会采取略微简化的画法。本文所公开的本发明的具体设计特征包括例如具体尺寸、方向、位置和外形将部分地由具体所要应用和使用的环境来确定。以及，在以下说明的实施方式中，有时在不同的附图之间共同使用同一附图标记来表示相同部分或具有相同功能的部分，而省略其重复说明。在本说明书中，使用相似的标号和字母表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。In order to make the purpose, advantages and features of the present invention clearer, the following describes a PFC circuit compatible with single-phase and three-phase AC input, a control method and a charger proposed by the present invention in further detail with reference to the accompanying drawings. It should be noted that, the accompanying drawings are all in a very simplified form and in inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention. It is to be understood that the drawings in the specification do not necessarily show specific structures of the invention to scale and that the illustrative features in the drawings for illustrating certain principles of the invention may also be shown in somewhat simplified form. The specific design features of the invention disclosed herein, including, for example, the specific dimensions, orientations, locations, and profiles will be determined in part by the specific intended application and use environment. In addition, in the embodiment described below, the same reference numerals are used in common between different drawings to denote the same parts or parts having the same function, and repeated description thereof may be omitted. In this specification, like numerals and letters are used to refer to like items, so once an item is defined in one figure, it need not be discussed further in subsequent figures.

在适当情况下，如此使用的这些术语可替换。类似的，如果本文所述的方法包括一系列步骤，且本文所呈现的这些步骤的顺序并非必须是可执行这些步骤的唯一顺序，且一些所述的步骤可被省略和/或一些本文未描述的其他步骤可被添加到该方法。These terms so used may be substituted under appropriate circumstances. Similarly, if a method described herein includes a series of steps, the order of the steps presented herein is not necessarily the only order in which the steps may be performed, and some of the steps described may be omitted and/or some not described herein Additional steps can be added to this method.

<实施例一><Example 1>

本实施例提供了一种兼容单相和三相交流输入的PFC电路，连接交流电网侧100和直流电路侧200。具体地，参见附图4，所述PFC电路包括继电器模块300、三相PFC功率模块400和直流侧滤波模块500。所述交流电网侧100的第一相和第二相分别连接所述三相PFC功率模块400第一输入端和第二输入端，零线或所述交流电网侧100的第三相经由所述继电器模块300连接所述三相PFC功率模块400的第三输入端。所述继电器模块300被配置为：根据驱动信号控制内部开关的通断状态，将所述零线与所述三相PFC功率模块400的第三输入端导通以进入单相工作模式；或将所述交流电网侧100的第三相与所述三相PFC功率模块400的第三输入端导通以进入三相工作模式。根据控制信号，所述三相PFC功率模块400被配置为：控制所述单相工作模式工作在整流状态或逆变状态；或控制所述三相工作模式工作在整流状态或逆变状态；所述三相PFC功率模块400的输出端经由所述直流侧滤波模块500 连接所述直流电路侧200。This embodiment provides a PFC circuit compatible with single-phase and three-phase AC input, connecting the AC grid side 100 and the 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 filter module 500 . The first phase and the second phase of the AC grid side 100 are respectively connected to the first input terminal and the second input terminal of the three-phase PFC power module 400, and the neutral line or the third phase of the AC grid side 100 passes through the The relay module 300 is connected to the third input terminal of the three-phase PFC power module 400 . The relay module 300 is configured to: control the on-off state of the internal switch according to the driving signal, and conduct the neutral line with the third input terminal of the three-phase PFC power module 400 to enter the single-phase working mode; or The third phase of the AC grid side 100 is connected to the third input terminal of the three-phase PFC power module 400 to enter the three-phase working mode. According to the control signal, the three-phase PFC power module 400 is configured to: control the single-phase working mode to work in a rectification state or an inverter state; or control the three-phase working mode to work in a rectification state or an inverter state; The output end of the three-phase PFC power module 400 is connected to the DC circuit side 200 via the DC side filter module 500 .

较佳地，在其中一种示例性实施方式中，参见附图5，所述继电器模块300包括一单刀双掷开关RL11；所述单刀双掷开关RL11的不动端连接所述三相PFC功率模块400的第三输入端；根据所述驱动信号，所述单刀双掷开关RL11的动端被配置为：导通N线(所述零线)与所述三相PFC功率模块400的第三输入端以进入单相工作模式；或导通所述交流电网侧100的W相(第三相)与所述三相PFC功率模块400的第三输入端以进入三相工作模式。Preferably, in one of the exemplary embodiments, referring to FIG. 5 , the relay module 300 includes a SPDT switch RL11; the stationary end of the SPDT switch RL11 is connected to the three-phase PFC power The third input terminal of the module 400; according to the driving signal, the moving terminal of the SPDT switch RL11 is configured to: conduct the N line (the neutral line) and the third input terminal of the three-phase PFC power module 400 input terminal to enter the single-phase working mode; or turn on the W-phase (third phase) of the AC grid side 100 and the third input terminal of the three-phase PFC power module 400 to enter the three-phase working mode.

较佳地，在其中一种示例性实施方式中，参见附图6，所述继电器模块300包括第一开关RL12和第二开关RL13；其中，所述第一开关RL12的一端与N线(所述零线)连接，所述第一开关RL12的另一端与所述三相PFC功率模块400的第三输入端连接；所述第二开关RL13的一端与所述交流电网侧100的第三相连接，所述第二开关RL13的另一端与所述三相PFC功率模块400的第三输入端连接；根据所述驱动信号，所述第一开关RL12和所述第二开关RL13被配置为：闭合所述第一开关RL12并断开所述第二开关RL13，导通N线与所述三相PFC功率模块400的第三输入端以进入单相工作模式；断开所述第一开关RL12并闭合所述第二开关RL13，导通所述交流电网侧100的W相与所述三相PFC功率模块400的第三输入端以进入三相工作模式。Preferably, in one of the exemplary embodiments, referring to FIG. 6 , the relay module 300 includes a first switch RL12 and a second switch RL13; wherein, one end of the first switch RL12 is connected to the N line (the The other end of the first switch RL12 is connected to the 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 grid side 100 connected, 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 as: Turn on the first switch RL12 and turn off the second switch RL13, turn on the N line and the third input terminal of the three-phase PFC power module 400 to enter the single-phase working mode; turn off the first switch RL12 The second switch RL13 is closed, and the W-phase of the AC grid side 100 and the third input terminal of the three-phase PFC power module 400 are turned on to enter the three-phase working mode.

如此配置，本发明提供的一种兼容单相和三相交流输入的PFC电路，需要的继电器数更少，节约电气元件降低成本及节约资源；进一步地，能够降低PFC电路的布局难度，减小相关电路板的尺寸(比如体积)更便于充电机的装配；再进一步地，由于没有继电器跨接在两相交流电网输入线之间，因此，不管从单相输入突然变为三相输入还是从三相输入突然变为单相输入，都不会跨接在两相交流电网之间的继电器短路电网，失效风险低。With this configuration, the present invention provides a PFC circuit compatible with single-phase and three-phase AC input, which requires fewer relays, saves electrical components, reduces costs, and saves resources; further, the layout difficulty of the PFC circuit can be reduced, reducing the The size (such as volume) of the relevant circuit board is more convenient for the assembly of the charger; further, since there is no relay connected between the input lines of the two-phase AC power grid, no matter whether the single-phase input suddenly changes to the three-phase input or from The three-phase input suddenly becomes a single-phase input, and the relays connected between the two-phase AC grids will not short-circuit the grid, and the risk of failure is low.

较佳地，在其中一种示例性实施方式中，继续参见附图5、附图6或附图7，所述三相PFC功率模块400包括一三相全桥开关电路，所述三相全桥开关电路包括第一开关管Q1、第二开关管Q2、第三开关管Q3、第四开关管Q4、第五开关管Q5和第六开关管Q6。其中，所述第一开关管Q1、所述第三开关管Q3和所述第五开关管Q5分别组成三个上桥臂，三个所述上桥臂的漏极输出端相连并连接所述直流侧滤波模块500的正极；所述第二开关管Q2、所述第四开关管Q4和所述第六开关管Q6分别组成三个下桥臂，三个所述下桥臂的源极输出端相连并连接所述直流侧滤波模块500的负极。Preferably, in one of the exemplary embodiments, continuing to refer to FIG. 5 , FIG. 6 or FIG. 7 , the three-phase PFC power module 400 includes a three-phase full-bridge switching circuit, the three-phase full-bridge switch circuit is The bridge switch circuit includes a first switch transistor Q1, a second switch transistor Q2, a third switch transistor Q3, a fourth switch transistor Q4, a fifth switch transistor Q5 and a sixth switch transistor Q6. Wherein, the first switch transistor Q1, the third switch transistor Q3 and the fifth switch transistor Q5 respectively form three upper bridge arms, and the drain output terminals of the three upper bridge arms are connected and connected to the The positive pole of the DC side filter module 500; the second switch tube Q2, the fourth switch tube Q4 and the sixth switch tube Q6 respectively form three lower bridge arms, and the source outputs of the three lower bridge arms The terminal is connected to the negative pole of the DC side filter module 500 .

进一步地，为了便于理解，定义所述三个上桥臂和所述三个下桥臂的连接处的引出线分别为第一引出线(图中未标示)、第二引出线(图中未标示)和第三引出线(图中未标示)，换句话说，所述第一引出线即为所述三相PFC功率模块400的第一输入端，所述第二引出线即为所述三相PFC功率模块400的第二输入端，所述第三引出线即为所述三相PFC功率模块400的第三输入端。由此，所述第一引出线与所述交流电网侧100的U相(即所述第一相)连接，所述第二引出线与所述交流电网侧100的V相(即所述第二相)连接，所述第三引出线经由所述继电器模块300与N线(即所述零线)或所述交流电网侧100的W相(即所述第三相)连接。可以理解地，上述实施方式仅是较佳实施方式的描述，而非本发明的限制，在其他的实施方式中，所述继电器模块200也可以设置在所述交流电网侧100的U相和所述第一引出线之间或设置在所述交流侧电网100的V相和所述第二引出线之间，不再一一赘述，但均在本发明的保护范围之内。Further, for ease of understanding, the lead lines at the junctions of the three upper bridge arms and the three lower bridge arms are defined as the first lead line (not marked in the figure) and the second lead line (not marked in the figure), respectively. marked) and the third lead wire (not marked in the figure), in other words, the first lead wire is the first input end of the three-phase PFC power module 400, and the second lead wire is the The second input terminal of the three-phase PFC power module 400 , and the third lead wire is the third input terminal of the three-phase PFC power module 400 . Therefore, the first lead wire is connected to the U phase (ie the first phase) of the AC grid side 100 , and the second lead wire is connected to the V phase of the AC grid side 100 (ie the first phase). Two-phase) connection, the third lead wire is connected to the N line (ie the neutral line) or the W phase (ie the third phase) of the AC grid side 100 via the relay module 300 . It can be understood that the above-mentioned embodiments are only descriptions of preferred embodiments, rather than limitations of the present invention. In other embodiments, the relay module 200 may also be disposed on the U-phase and all of the AC grid side 100 . Between the first lead wires or between the V phase of the AC side power grid 100 and the second lead wires, the details will not be repeated, but they are all within the protection scope of the present invention.

较佳地，在其中一种示例性实施方式中，继续参见附图5、附图6或附图7，所述三相PFC功率模块400还包括第一电感L1、第二电感L2和第三电感L3；所述第一电感L1的其中一端与所述交流电网侧100的第一相连接，所述第一电感L2的另外一端与所述第一引出线连接；所述第二电感L2的其中一端与所述交流电网侧100的第二相连接，所述第二电感L2的另外一端与所述第二引出线连接；所述第三电感L3的其中一端经由所述继电器模块300与所述零线或所述交流电网侧100的第三相连接，所述第三电感L3的另外一端与所述第三引出线连接。与上一实施方式不同的是，在本实施方式中，所述第一电感L1的其中一端为所述三相PFC功率模块400的第一输入端，所述第二电感L2的其中一端为所述三相PFC功率模块400的第二输入端，所述第三电感L3的其中一端为所述三相PFC功率模块400的第三输入端。Preferably, in one of the exemplary embodiments, referring to FIG. 5 , FIG. 6 or FIG. 7 , the three-phase PFC power module 400 further includes a first inductor L1 , a second inductor L2 and a third Inductance L3; one end of the first inductance L1 is connected to the first phase of the AC grid side 100, and the other end of the first inductance L2 is connected to the first lead wire; the second inductance L2 One end is connected to the second phase of the AC grid side 100 , the other end of the second inductance L2 is connected to the second lead wire; one end of the third inductance L3 is connected to the second phase through the relay module 300 . The neutral line or the third phase of the AC grid side 100 is connected, and the other end of the third inductor L3 is connected to the third lead wire. Different from the previous embodiment, in this embodiment, one end of the first inductor L1 is the first input end of the three-phase PFC power module 400, and one end of the second inductor L2 is the first input end of the three-phase PFC power module 400. The second input end of the three-phase PFC power module 400 , and one end of the third inductor L3 is the third input end of the three-phase PFC power module 400 .

如此配置，无论单相工作模式还是三相工作模式，所述兼容单相和三相交流输入的PFC电路的电感都是对称结构，单相模式下U相和N线上具有电感滤波，因此，高频电流很难通过N线传导至所述交流电网侧，大大降低了交流电网侧的EMI噪声。With this configuration, no matter the single-phase working mode or the three-phase working mode, the inductance of the PFC circuit compatible with single-phase and three-phase AC input is a symmetrical structure, and the U-phase and N lines have inductance filtering in the single-phase mode. It is difficult for the high-frequency current to be conducted to the AC grid side through the N line, which greatly reduces the EMI noise on the AC grid side.

优选地，在其中一种示例性实施方式中，所述第一开关管Q1、所述第二开关管Q2、所述第三开关管Q3、所述第四开关管Q4、所述第五开关管Q5和/或第六开关管Q6包括但不限于MOSFET管和/或IGBT。Preferably, in one of the exemplary embodiments, the first switch transistor Q1, the second switch transistor Q2, the third switch transistor Q3, the fourth switch transistor Q4, and the fifth switch transistor The transistor Q5 and/or the sixth switch transistor Q6 include but are not limited to MOSFET transistors and/or IGBTs.

较佳地，在其中一种示例性实施方式中，继续参见附图5、附图6以及附图7，所述直流侧滤波模块500包括串联连接的第一电容C1和第二电容C2。其中，所述第一电容C1的正极连接三个所述上桥臂的漏极输出端，所述第一电容C1的负极连接所述第二电容C2的正极；所述第二电容C2的负极连接三个所述下桥臂的源极输出端。本领域的技术人员能够明白，这仅是优选实施方式的描述，在其他的实施方式中，所述直流侧滤波模块500包括但不限于多个电容串联后再并联或多个电容并联，这些变形均在本发明的保护范围之内。Preferably, in one of the exemplary embodiments, referring to FIG. 5 , FIG. 6 and FIG. 7 , the DC side filter 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 to the drain output terminals of the three upper bridge arms, the negative electrode of the first capacitor C1 is connected to the positive electrode of the second capacitor C2; the negative electrode of the second capacitor C2 The source output terminals of the three lower bridge arms are connected. Those skilled in the art can understand that this is only the description of the preferred embodiment. In other embodiments, the DC side filter module 500 includes but is not limited to multiple capacitors connected in series and then connected in parallel or multiple capacitors connected in parallel. These modifications All fall within the protection scope of the present invention.

较佳地，在其中一种示例性实施方式中，继续参见附图5、附图6和附图7，兼容单相和三相交流输入的PFC电路还包括冲击电流抑制模块600，所述三相PFC功率模块400经由所述冲击电流抑制模块600连接所述直流侧滤波模块500。具体地，所述冲击电流抑制模块600包括一并联连接的第三开关RL14和第一电阻R1。所述第三开关RL14的其中一端与所述第一电阻R1的其中一端连接形成所述冲击电流抑制模块600的第一连接端(图中未标示)，所述第三开关RL14的其中一端与所述第一电阻R1的另外一端连接形成所述冲击电流抑制模块600的第二连接端(图中未标示)。在其中一种实施方式中，所述冲击电流抑制模块600的第一连接端连接三个所述上桥臂的漏极输出端，所述冲击电流流抑制模块600的第二连接端连接所述直流侧滤波模块500的正极。在另外一种实施方式中，所述冲击电流抑制模块600的第一连接端连接三个所述下桥臂的源极输出端，所述冲击电流流抑制模块600的第二连接端所述直流侧滤波模块500的负极。所述第一电阻R1包括热敏电阻(PTC)。Preferably, in one of the exemplary embodiments, continue to refer to FIG. 5 , FIG. 6 and FIG. 7 , the PFC circuit compatible with single-phase and three-phase AC input further includes an inrush current suppression module 600 , the three The phase PFC power module 400 is connected to the DC side filter module 500 via the inrush 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 end (not shown in the figure) 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 is connected to form a second connection end of the inrush current suppression module 600 (not marked in the figure). In one embodiment, the first connection terminal of the inrush current suppression module 600 is connected to the drain output terminals of the three upper bridge arms, and the second connection terminal of the inrush current suppression module 600 is connected to the The positive pole of the DC side filter module 500 . In another embodiment, the first connection end of the inrush current suppression module 600 is connected to the source output ends of the three lower bridge arms, and the second connection end of the inrush current suppression module 600 is the direct current The negative pole of the side filter module 500. The first resistor R1 includes a thermistor (PTC).

如此配置，冲击电流抑制策略如下：当所述第三开关RL4断开时，无论所述PFC电路工作在单相还是三相模式下，所述第一电阻R1均可参与所述PFC电路的启动过程，实现所述PFC电路的软启动。具体地，参见附图8和附图9，其中，附图8为单相工作模式下PFC电路启动冲击电流抑制电路示意图(以单相电网正半周为例)，图9为基于图6三相工作模式下PFC电路启动冲击电流抑制电路示意图(以V _UN＞V _VN＞V _WN时为例)。所述交流电网侧的单相或三相交流电经所述三相PFC功率模块400的电感、开关管和所述冲击电流抑制模块600的所述第一电阻R1后给所述直流侧滤波模块500的第一电容C1和第二电容C2预充电，所述第一电阻R1可以很好地限制所述PFC电路启动瞬间的冲击电流，从而避免启动冲击电流过大对功率器件造成损坏。 In this configuration, the inrush current suppression strategy is as follows: when the third switch RL4 is turned off, the first resistor R1 can participate in the startup of the PFC circuit regardless of whether the PFC circuit operates in single-phase or three-phase mode process to realize the soft start of the PFC circuit. Specifically, referring to FIG. 8 and FIG. 9 , FIG. 8 is a schematic diagram of the start-up rush current suppression circuit of the PFC circuit in the single-phase working mode (taking the positive half cycle of the single-phase power grid as an example), and FIG. 9 is a three-phase diagram based on FIG. 6 . Schematic diagram of the start-up inrush current suppression circuit of the PFC circuit in the working mode (taking V _UN > V _VN > V _WN as an example). The single-phase or three-phase AC power on the AC grid side is fed to the DC-side filter module 500 through the inductor, the switch tube of the three-phase PFC power module 400 and the first resistor R1 of the inrush current suppression module 600 . The first capacitor C1 and the second capacitor C2 are precharged, and the first resistor R1 can well limit the inrush current at the moment of startup of the PFC circuit, so as to avoid damage to the power device caused by excessive startup inrush current.

如此配置，功率变换控制策略如下：With this configuration, the power conversion control strategy is as follows:

当所述PFC电路处于单相工作模式时，所述第一开关R12连接N线，所述第三开关管RL14闭合，此时，所述PFC电路等效为如附图10和附图11。其中，图10为所述PFC电路工作在单相工作模式的整流状态等效电路示意图；图11为所述PFC电路工作在单相工作模式的逆变状态的等效电路示意图。When the PFC circuit is in the single-phase working mode, the first switch R12 is connected to the N line, and the third switch RL14 is closed. At this time, the PFC circuit is equivalent to FIG. 10 and FIG. 11 . 10 is a schematic diagram of an equivalent circuit in a rectification state when the PFC circuit operates in a single-phase operation mode; FIG. 11 is a schematic diagram of an equivalent circuit in an inverter state when the PFC circuit operates in a single-phase operation mode.

当所述PFC电路处于三相工作模式时，所述第一开关R12连接W线，所述第三开关管RL14闭合，此时，所述PFC电路等效为如附图12和附图13。其中，图12为所述PFC电路工作在三相工作模式的整流状态等效电路示意图；图13为所述PFC电路工作在三相工作模式的逆变状态的等效电路示意图。When the PFC circuit is in the three-phase operating mode, the first switch R12 is connected to the W line, and the third switch RL14 is closed. At this time, the PFC circuit is equivalent to FIG. 12 and FIG. 13 . 12 is a schematic diagram of an equivalent circuit in a rectification state when the PFC circuit operates in a three-phase operation mode; FIG. 13 is a schematic diagram of an equivalent circuit in an inverter state when the PFC circuit operates in a three-phase operation mode.

特别地，本发明并不限制所述单刀双掷开关RL11、所述第一开关RL12、所述第二开关RL13、所述第三开关RL13、所述第一开关管Q1、所述第二开关管Q2、所述第三开关管Q3、所述第四开关管Q4、所述第五开关管Q5和所述第六开关管Q6、第一电容C1、第二电容C2以及第一电阻R1等相关电气器件的具体参数，各电气器件的相关参数应根据电路具体要求而定。In particular, the present invention does not limit the SPDT switch RL11 , the first switch RL12 , the second switch RL13 , the third switch RL13 , the first switch transistor Q1 , and 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, the first resistor R1, etc. The specific parameters of the relevant electrical devices, the relevant parameters of each electrical device should be determined according to the specific requirements of the circuit.

由此可见，本发明提出的一种兼容单相和三相交流输入的PFC电路，通过冲击电流抑制模块600和所述继电器模块300配合工作，能够很好地抑制PFC电路的启动冲击电流；通过控制第一至第六开关管Q1～Q6，能够实现单/三相整流及逆变功能。It can be seen that, a PFC circuit compatible with single-phase and three-phase AC input proposed by the present invention can effectively suppress the start-up inrush current of the PFC circuit by cooperating with the inrush current suppression module 600 and the relay module 300; By controlling the first to sixth switch tubes Q1-Q6, single/three-phase rectification and inverter functions can be realized.

<实施例二><Example 2>

本实施例提供了一种采用上述任一实施方式所述的兼容单相和三相交流输入的PFC电路的控制方法，参见附图14，包括：This embodiment provides a control method for a PFC circuit compatible with single-phase and three-phase AC input described in any of the above embodiments, referring to FIG. 14 , including:

S1：所述继电器模块根据驱动信号控制内部开关的通断状态，将所述零线与所述三相PFC功率模块的第三输入端导通以进入单相工作模式；或将所述交流电网侧的第三相与所述三相PFC功率模块的第三输入端导通以进入三相工作模式。S1: The relay module controls the on-off state of the internal switch according to the driving signal, and conducts the neutral line and the third input terminal of the three-phase PFC power module to enter the single-phase working mode; The third phase of the side is connected with the third input terminal of the three-phase PFC power module to enter the three-phase working mode.

S2：所述三相PFC功率模块根据控制信号控制所述单相工作模式工作在整流状态或逆变状态；或控制所述三相工作模式工作在整流状态或逆变状态；并将所述交流电网侧输入的市电整流后输出正负母线电压至所述直流侧滤波模块，或将直流电路侧直流电压逆变后输出交流电压至所述交流电网侧。S2: The three-phase PFC power module controls the single-phase working mode to work in a rectifying state or an inverting state according to a control signal; or controls the three-phase working mode to work in a rectifying state or an inverting state; The mains input on the grid side is rectified and then output positive and negative bus voltages to the DC side filter module, or the DC circuit side DC voltage is inverted and then output AC voltage to the AC grid side.

优选地，在其中一种示例性实施方式中，在启动所述PFC电路时，采用冲击电流抑制策略，断开所述第三开关RL14，所述三相PFC功率模块400经由所述第一电阻R1连接所述直流侧滤波模块500；当所述PFC电路工作在单相或三相工作模式时，闭合所述第三开关RL14，所述三相PFC功率模块400与所述直流侧滤波模块500导通。此时的等效电路图可以参见图8和/或图9。Preferably, in one of the exemplary embodiments, when starting the PFC circuit, an inrush current suppression strategy is adopted, and the third switch RL14 is turned off, and the three-phase PFC power module 400 passes through the first resistor. R1 is connected to the DC side filter module 500; when the PFC circuit works in single-phase or three-phase operation mode, the third switch RL14 is closed, the three-phase PFC power module 400 and the DC side filter module 500 on. The equivalent circuit diagram at this time may refer to FIG. 8 and/or FIG. 9 .

优选地，在其中一种示例性实施方式中，步骤S2中，所述三相PFC功率模块根据控制信号控制所述单相工作模式工作在整流状态或逆变状态的方法，包括：Preferably, in one of the exemplary embodiments, in step S2, the method for the three-phase PFC power module to control the single-phase operation mode to work in a rectification state or an inverter state according to a control signal, includes:

在单相工作模式下，所述控制信号包括单极倍频SPWM调制方式；当所述单相工作模式工作在整流状态时，所述控制信号控制所述第一开关管Q1、所述第二开关管Q2、所述第五开关管Q5和所述第六开关管Q6，将所述交流电网侧100的单相交流电转化为直流电/高压直流电；并通过改变所述第一开关管Q1、所述第二开关管Q2、所述第五开关管Q5和所述第六开关管Q6的占空比，调节所述直流电路侧200的输出电压。也可实现输入侧功率因数校正的目的。当所述PFC电路工作在单相工作模式的逆变状态时，所述单极倍频SPWM调制方式调节所述第一开关管Q1、所述第二开关管Q2、所述第五开关管Q5和所述第六开关管Q6的占空比，将所述直流电路侧200的直流电逆变为单相交流电并输送至所述交流电网侧100。进一步地，通过调节所述第一开关管Q1、所述第二开关管Q2、所述第五开关管Q5以及所述第六开关管Q6的占空比，能够使得所述PFC电路在不同直流输入电压有效值、不同交流输出负载下均能逆变输出单相交流电压，显然地，以上仅是较佳实施方式的描述，并非并发明的限制，比如，在其他的实施方式中，在在单相工作模式的逆变状态时，也可以采用所述单极倍频SPWM调制方式。不再一一赘述，但均在本发明的保护范围之内。In the single-phase working mode, the control signal includes a unipolar frequency-doubling SPWM modulation mode; when the single-phase working mode works in the rectification state, the control signal controls the first switch Q1, the second The switch tube Q2, the fifth switch tube Q5 and the sixth switch tube Q6 convert the single-phase alternating current of the AC grid side 100 into direct current/high voltage direct current; The duty ratio of the second switch transistor Q2 , the fifth switch transistor Q5 and the sixth switch transistor Q6 adjusts the output voltage of the DC circuit side 200 . It can also achieve the purpose of power factor correction on the input side. When the PFC circuit works in the inverter state of the single-phase operation mode, the unipolar frequency multiplication SPWM modulation mode adjusts the first switch Q1, the second switch Q2, and the fifth switch Q5 According to the duty cycle of the sixth switch transistor Q6 , the direct current on the direct current circuit side 200 is converted into single-phase alternating current and sent to the alternating current grid side 100 . Further, by adjusting the duty ratio of the first switch transistor Q1, the second switch transistor Q2, the fifth switch transistor Q5 and the sixth switch transistor Q6, the PFC circuit can be operated at different DC voltages. The effective value of the input voltage and the output of single-phase AC voltage can be inverted under different AC output loads. Obviously, the above is only the description of the preferred embodiment, not the limitation of the invention. For example, in other embodiments, in the In the inverter state of the single-phase operation mode, the unipolar frequency multiplication SPWM modulation mode can also be used. They will not be repeated one by one, but they are all within the protection scope of the present invention.

如此配置，所述PFC电路在所述单相工作模式时，所述第一开关管Q1、所述第二开关管Q2、所述第五开关管Q5以及所述第六开关管Q6均工作在高频状态下，由此，与现有技术相比，本发明提出的一种兼容单相和三相交流输入的PFC电路无需考虑工频管设计。In this configuration, when the PFC circuit is in the single-phase operating mode, the first switch transistor Q1, the second switch transistor Q2, the fifth switch transistor Q5 and the sixth switch transistor Q6 all work at In the high frequency state, therefore, compared with the prior art, a PFC circuit compatible with single-phase and three-phase AC input proposed by the present invention does not need to consider the design of power frequency tubes.

优选地，在其中一种实施方式中，步骤S2中，控制所述三相工作模式工作在整流状态或逆变状态的方法，包括：Preferably, in one of the embodiments, in step S2, the method for controlling the three-phase operating mode to work in a rectifying state or an inverting state includes:

在三相工作模式下，所述控制信号包括电压空间矢量调制方式；通过所述电压空间矢量调制方式调节所述第一开关管Q1至所述第六开关管Q6的占空比，控制所述三相工作模式工作在整流状态或逆变状态的方法。由此，即可以实现能量从所述直流电路侧200流向所述交流电网侧100。In the three-phase working mode, the control signal includes a voltage space vector modulation method; the duty ratios of the first switch transistor Q1 to the sixth switch transistor Q6 are adjusted by the voltage space vector modulation method, and the The three-phase working mode is a method of working in a rectifying state or an inverting state. Thus, energy can flow from the DC circuit side 200 to the AC grid side 100 .

优选地，在其中一种实施方式中，无论在所述单相工作模式或所述三相工作模式下，所述第一开关管Q1至所述第六开关管Q6均工作在PWM模式下。Preferably, in one of the embodiments, no matter in the single-phase working mode or the three-phase working mode, the first switching transistor Q1 to the sixth switching transistor Q6 all work in the PWM mode.

基于同一发明构思，本发明的再一实施例还提供了一种充电机，所述充电机包括上述任一实施方式所述的兼容单相和三相交流输入的PFC电路。所述充电机包括但不限于车载充电机。Based on the same inventive concept, yet another embodiment of the present invention further provides a charger, where the charger includes the PFC circuit compatible with single-phase and three-phase AC input described in any of the foregoing embodiments. The chargers include but are not limited to vehicle-mounted chargers.

由于本实施例提供的一种充电机，与上述任一实施方式提供的所述兼容单相和三相交流输入的PFC电路属于同一发明构思，因此，至少具有与其相同的有益效果，在此，不再一一赘述。Since the charger provided in this embodiment belongs to the same inventive concept as the PFC circuit compatible with single-phase and three-phase AC input provided by any of the above-mentioned embodiments, it has at least the same beneficial effects. Here, I won't repeat them one by one.

此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed 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, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

综上，上述实施例对本发明提出的一种兼容单相和三相交流输入的PFC电路、控制方法及充电机的不同构型进行了详细说明，当然，上述描述仅是对本发明较佳实施例的描述，并非对本发明范围的任何限定，本发明包括但不局限于上述实施中所列举的构型，本领域技术人员可以根据上述实施例的内容举一反三，本发明领域的普通技术人员根据上述揭示内容做的任何变更、修饰，均属于权利要求书的保护范围。To sum up, the above embodiments describe in detail the different configurations of a PFC circuit, a control method and a charger that are compatible with single-phase and three-phase AC input proposed by the present invention. Of course, the above description is only a preferred embodiment of the present invention. The description of the present invention does not limit the scope of the present invention. The present invention includes but is not limited to the configurations listed in the above implementation. Those skilled in the art can draw inferences from the contents of the above embodiments. Any changes and modifications made to the content fall within the protection scope of the claims.

Claims

一种兼容单相和三相交流输入的PFC电路，连接交流电网侧和直流电路侧，其特征在于，所述PFC电路包括继电器模块、三相PFC功率模块和直流侧滤波模块；A PFC circuit compatible with single-phase and three-phase AC input, connecting the AC grid side and the DC circuit side, characterized in that the PFC circuit comprises a relay module, a three-phase PFC power module and a DC side filter module;

所述交流电网侧的第一相和第二相分别连接所述三相PFC功率模块第一输入端和第二输入端，零线或所述交流电网侧的第三相经由所述继电器模块连接所述三相PFC功率模块的第三输入端；The first phase and the second phase on the AC grid side are respectively connected to the first input terminal and the second input terminal of the three-phase PFC power module, and the neutral line or the third phase on the AC grid side is connected via the relay module the third input end of the three-phase PFC power module;

所述继电器模块被配置为：根据驱动信号控制内部开关的通断状态，将所述零线与所述三相PFC功率模块的第三输入端导通以进入单相工作模式；或将所述交流电网侧的第三相与所述三相PFC功率模块的第三输入端导通以进入三相工作模式；The relay module is configured to: control the on-off state of the internal switch according to the driving signal, and conduct the neutral line and the third input terminal of the three-phase PFC power module to enter the single-phase working mode; The third phase on the AC grid side is connected to the third input end of the three-phase PFC power module to enter the three-phase working mode;

根据控制信号，所述三相PFC功率模块被配置为：控制所述单相工作模式工作在整流状态或逆变状态；According to the control signal, the three-phase PFC power module is configured to: control the single-phase working mode to work in a rectifying state or an inverting state;

或or

控制所述三相工作模式工作在整流状态或逆变状态；controlling the three-phase working mode to work in a rectifying state or an inverting state;

所述三相PFC功率模块的输出端经由所述直流侧滤波模块连接所述直流电路侧。The output end of the three-phase PFC power module is connected to the DC circuit side via the DC side filter module.
根据权利要求1所述的兼容单相和三相交流输入的PFC电路，其特征在于，所述继电器模块包括一单刀双掷开关；The PFC circuit compatible with single-phase and three-phase AC input according to claim 1, wherein the relay module comprises a single-pole double-throw switch;

所述单刀双掷开关的不动端连接所述三相PFC功率模块的第三输入端；The stationary end of the SPDT switch is connected to the third input end of the three-phase PFC power module;

根据所述驱动信号，所述单刀双掷开关的动端被配置为：According to the drive signal, the moving end of the SPDT switch is configured as:

导通所述零线与所述三相PFC功率模块的第三输入端以进入单相工作模式；turning on the neutral line and the third input end of the three-phase PFC power module to enter the single-phase working mode;

或or

导通所述交流电网侧的第三相与所述三相PFC功率模块的第三输入端以进入三相工作模式。The third phase on the AC grid side and the third input terminal of the three-phase PFC power module are turned on to enter the three-phase working mode.
根据权利要求1所述的兼容单相和三相交流输入的PFC电路，其特征在于，所述继电器模块包括第一开关和第二开关；The PFC circuit compatible with single-phase and three-phase AC input according to claim 1, wherein the relay module comprises a first switch and a second switch;

其中，所述第一开关的一端与所述零线连接，所述第一开关的另一端与所述三相PFC功率模块的第三输入端连接；Wherein, one end of the first switch is connected to the neutral line, and the other end of the first switch is connected to the third input end of the three-phase PFC power module;

所述第二开关的一端与所述交流电网侧的第三相连接，所述第二开关的另一端与所述三相PFC功率模块的第三输入端连接；One end of the second switch is connected to the third phase on the AC grid side, and the other end of the second switch is connected to the third input end of the three-phase PFC power module;

根据所述驱动信号，所述第一开关和所述第二开关被配置为：According to the drive signal, the first switch and the second switch are configured to:

闭合所述第一开关并断开所述第二开关，导通所述零线与所述三相PFC功率模块的第三输入端以进入单相工作模式；closing the first switch and opening the second switch, and turning on the neutral line and the third input terminal of the three-phase PFC power module to enter the single-phase working mode;

断开所述第一开关并闭合所述第二开关，导通所述交流电网侧的第三相与所述三相PFC功率模块的第三输入端以进入三相工作模式。The first switch is opened and the second switch is closed, and the third phase on the AC grid side and the third input terminal of the three-phase PFC power module are turned on to enter the three-phase working mode.
根据权利要求1所述的兼容单相和三相交流输入的PFC电路，其特征在于，所述三相PFC功率模块包括一三相全桥开关电路，所述三相全桥开关电路包括第一开关管、第二开关管、第三开关管、第四开关管、第五开关管和第六开关管；The PFC circuit compatible with single-phase and three-phase AC input according to claim 1, wherein the three-phase PFC power module includes a three-phase full-bridge switch circuit, and the three-phase full-bridge switch circuit includes a first switch tube, second switch tube, third switch tube, fourth switch tube, fifth switch tube and sixth switch tube;

所述第一开关管、所述第三开关管和所述第五开关管分别组成三个上桥臂，三个所述上桥臂的漏极输出端相连并连接所述直流侧滤波模块的正极；The first switch tube, the third switch tube and the fifth switch tube respectively form three upper bridge arms, and the drain output ends of the three upper bridge arms are connected and connected to the DC side filter module. positive electrode;

所述第二开关管、所述第四开关管和所述第六开关管分别组成三个下桥臂，三个所述下桥臂的源极输出端相连并连接所述直流侧滤波模块的负极；The second switch tube, the fourth switch tube and the sixth switch tube respectively form three lower bridge arms, and the source output ends of the three lower bridge arms are connected and connected to the DC side filter module. negative electrode;

定义所述三个上桥臂和所述三个下桥臂的连接处的引出线分别为第一引出线、第二引出线和第三引出线；Define the lead wires at the connection of the three upper bridge arms and the three lower bridge arms as the first lead wire, the second lead wire and the third lead wire;

所述第一引出线与所述交流电网侧的第一相连接，所述第二引出线与所述交流电网侧的第二相连接，所述第三引出线经由所述继电器模块与所述零线或所述交流电网侧的第三相连接。The first lead wire is connected to the first phase on the AC grid side, the second lead wire is connected to the second phase on the AC grid side, and the third lead wire is connected to the Neutral or third phase connection on the AC grid side.
根据权利要求4所述的兼容单相和三相交流输入的PFC电路，其特征在于，所述三相PFC功率模块还包括第一电感、第二电感和第三电感；The PFC circuit compatible with single-phase and three-phase AC input according to claim 4, wherein the three-phase PFC power module further comprises a first inductor, a second inductor and a third inductor;

所述第一电感的其中一端与所述交流电网侧的第一相连接，所述第一电感的另外一端与所述第一引出线连接；One end of the first inductor is connected to the first phase on the AC grid side, and the other end of the first inductor is connected to the first lead wire;

所述第二电感的其中一端与所述交流电网侧的第二相连接，所述第二电感的另外一端与所述第二引出线连接；One end of the second inductance is connected to the second phase on the AC grid side, and the other end of the second inductance is connected to the second lead wire;

所述第三电感的其中一端经由所述继电器模块与所述零线或所述交流电网侧的第三相连接，所述第三电感的另外一端与所述第三引出线连接。One end of the third inductor is connected to the neutral line or the third phase on the AC grid side via the relay module, and the other end of the third inductor is connected to the third lead wire.
根据权利要求4-5任一项所述的兼容单相和三相交流输入的PFC电路，其特征在于，所述第一开关管、所述第二开关管、所述第三开关管、所述第四开关管、所述第五开关管和/或所述第六开关管包括MOSFET管和/或IGBT。The PFC circuit compatible with single-phase and three-phase AC input according to any one of claims 4-5, wherein the first switch tube, the second switch tube, the third switch tube, the The fourth switch transistor, the fifth switch transistor and/or the sixth switch transistor include MOSFET transistors and/or IGBTs.
根据权利要求4所述的兼容单相和三相交流输入的PFC电路，其特征在于，所述直流侧滤波模块包括串联连接的第一电容和第二电容；The PFC circuit compatible with single-phase and three-phase AC input according to claim 4, wherein the DC side filter module comprises a first capacitor and a second capacitor connected in series;

其中，所述第一电容的正极连接三个所述上桥臂的漏极输出端，所述第一电容的负极连接所述第二电容的正极；Wherein, the positive electrode of the first capacitor is connected to the drain output terminals of the three upper bridge arms, and the negative electrode of the first capacitor is connected to the positive electrode of the second capacitor;

所述第二电容的负极连接三个所述下桥臂的源极输出端。The negative electrode of the second capacitor is connected to the source output terminals of the three lower bridge arms.
根据权利要求4所述的兼容单相和三相交流输入的PFC电路，其特征在于，还包括冲击电流抑制模块，所述三相PFC功率模块经由所述冲击电流抑制模块连接所述直流侧滤波模块。The PFC circuit compatible with single-phase and three-phase AC input according to claim 4, further comprising an inrush current suppression module, and the three-phase PFC power module is connected to the DC side filter via the inrush current suppression module module.
根据权利要求8所述的兼容单相和三相交流输入的PFC电路，其特征在于，所述冲击电流抑制模块包括一并联连接的第三开关和第一电阻；The PFC circuit compatible with single-phase and three-phase AC input according to claim 8, wherein the inrush current suppression module comprises a third switch and a first resistor connected in parallel;

所述第三开关的其中一端与所述第一电阻的其中一端连接形成所述冲击电流抑制模块的第一连接端，所述第三开关的其中一端与所述第一电阻的另外一端连接形成所述冲击电流抑制模块的第二连接端；One end of the third switch is connected to one end of the first resistor to form a first connection end of the inrush current suppression module, and one end of the third switch is connected to the other end of the first resistor to form a first connection end a second connection end of the inrush current suppression module;

所述冲击电流抑制模块的第一连接端连接三个所述上桥臂的漏极输出端，所述冲击电流流抑制模块的第二连接端连接所述直流侧滤波模块的正极；The first connection end of the inrush current suppression module is connected to the drain output ends of the three upper bridge arms, and the second connection end of the inrush current suppression module is connected to the positive electrode of the DC side filter module;

或or

所述冲击电流抑制模块的第一连接端连接三个所述下桥臂的源极输出端，所述冲击电流流抑制模块的第二连接端所述直流侧滤波模块的负极。The first connection end of the inrush current suppression module is connected to the source output ends of the three lower bridge arms, and the second connection end of the inrush current suppression module is connected to the negative electrode of the DC side filter module.
一种采用权利要求1所述的兼容单相和三相交流输入的PFC电路的控制方法，其特征在于，包括：A control method using the PFC circuit compatible with single-phase and three-phase AC input according to claim 1, characterized in that, comprising:

S1：所述继电器模块根据驱动信号控制内部开关的通断状态，将所述零线与所述三相PFC功率模块的第三输入端导通以进入单相工作模式；或将所述交流电网侧的第三相与所述三相PFC功率模块的第三输入端导通以进入三相工作模式；S1: The relay module controls the on-off state of the internal switch according to the driving signal, and conducts the neutral line and the third input terminal of the three-phase PFC power module to enter the single-phase working mode; The third phase of the side is connected with the third input end of the three-phase PFC power module to enter the three-phase working mode;

S2：所述三相PFC功率模块根据控制信号控制所述单相工作模式工作在整流状态或逆变状态；或控制所述三相工作模式工作在整流状态或逆变状态；S2: the three-phase PFC power module controls the single-phase operation mode to work in a rectification state or an inverter state according to a control signal; or controls the three-phase operation mode to work in a rectifier state or an inverter state;

并将所述交流电网侧输入的市电整流后输出正负母线电压至所述直流侧滤波模块，或将直流电路侧直流电压逆变后输出交流电压至所述交流电网侧；rectifying the mains input from the AC grid side and then outputting the positive and negative busbar voltages to the DC side filter module, or inverting the DC circuit side DC voltage and outputting the AC voltage to the AC grid side;

S3：所述直流侧滤波模块对所述正负母线电压进行滤波后输出给所述直流电路侧。S3: The DC side filter module filters the positive and negative bus voltages and outputs the filtered voltages to the DC circuit side.
根据权利要求10所述的一种兼容单相和三相交流输入的PFC电路的控制方法，其特征在于，所述PFC电路还包括冲击电流抑制模块，所述冲击电流抑制模块包括并联连接的第三开关和第一电阻；The control method for a PFC circuit compatible with single-phase and three-phase AC input according to claim 10, wherein the PFC circuit further comprises an inrush current suppression module, and the inrush current suppression module comprises a parallel connected first Three switches and a first resistor;

所述三相PFC功率模块经由所述冲击电流抑制模块连接所述直流侧滤波模块；the three-phase PFC power module is connected to the DC side filter module via the inrush current suppression module;

在启动所述PFC电路时，断开所述第三开关，所述三相PFC功率模块经由所述第一电阻连接所述直流侧滤波模块；When starting the PFC circuit, the third switch is disconnected, and the three-phase PFC power module is connected to the DC side filter module via the first resistor;

当所述PFC电路工作在单相或三相工作模式时，闭合所述第三开关，所述三相PFC功率模块与所述直流侧滤波模块导通。When the PFC circuit operates in a single-phase or three-phase operation mode, the third switch is closed, and the three-phase PFC power module and the DC side filter module are connected.
根据权利要求10所述的兼容单相和三相交流输入的PFC电路的控制方法，其特征在于，所述三相PFC功率模块包括一三相全桥开关电路，所述三相全桥开关电路包括第一开关管、第二开关管、第三开关管、第四开关管、第五开关管和第六开关管；The control method of a PFC circuit compatible with single-phase and three-phase AC input according to claim 10, wherein the three-phase PFC power module comprises a three-phase full-bridge switch circuit, and the three-phase full-bridge switch circuit It includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube and a sixth switch tube;

所述第一开关管、所述第三开关管和所述第五开关管分别组成三个上桥臂，三个所述上桥臂的漏极输出端相连并连接所述直流侧滤波模块的正极；The first switch tube, the third switch tube and the fifth switch tube respectively form three upper bridge arms, and the drain output ends of the three upper bridge arms are connected and connected to the DC side filter module. positive electrode;

所述第二开关管、所述第四开关管和所述第六开关管分别组成三个下桥臂，三个所述下桥臂的源极输出端相连并连接所述直流侧滤波模块的负极；The second switch tube, the fourth switch tube and the sixth switch tube respectively form three lower bridge arms, and the source output ends of the three lower bridge arms are connected and connected to the DC side filter module. negative electrode;

定义所述三个上桥臂和所述三个下桥臂的连接处的引出线分别为第一引出线、第二引出线和第三引出线；Define the lead wires at the connection of the three upper bridge arms and the three lower bridge arms as the first lead wire, the second lead wire and the third lead wire;

所述第一引出线与所述交流电网侧的第一相连接，所述第二引出线与所述交流电网侧的第二相连接，所述第三引出线经由所述继电器模块与所述零线或所述交流电网侧的第三相连接；The first lead wire is connected to the first phase on the AC grid side, the second lead wire is connected to the second phase on the AC grid side, and the third lead wire is connected to the neutral or third phase connection on the AC grid side;

步骤S2中，所述三相PFC功率模块根据控制信号控制所述单相工作模式工作在整流状态或逆变状态的方法，包括：In step S2, the method for the three-phase PFC power module to control the single-phase operation mode to work in a rectification state or an inverter state according to a control signal, includes:

在单相工作模式下，所述控制信号包括单极倍频SPWM调制方式；In the single-phase working mode, the control signal includes a unipolar frequency-doubling SPWM modulation mode;

当所述单相工作模式工作在整流状态时，所述控制信号控制所述第一开关管、所述第二开关管、所述第五开关管和所述第六开关管，将所述交流电网侧的单相交流电转化为直流电；并通过改变所述第一开关管、所述第二开关管、所述第五开关管和所述第六开关管的占空比，调节所述直流电路侧的输出电压；When the single-phase working mode works in the rectification state, the control signal controls the first switch, the second switch, the fifth switch and the sixth switch to convert the AC The single-phase alternating current on the grid side is converted into direct current; and the DC circuit is adjusted by changing the duty ratio of the first switch tube, the second switch tube, the fifth switch tube and the sixth switch tube side output voltage;

当所述单相工作模式工作在逆变状态时，所述控制信号调节所述第一开关管、所述第二开关管、所述第五开关管和所述第六开关管的占空比，将所述直流电路侧的直流电逆变至单相交流电并输送至所述交流电网侧。When the single-phase working mode works in an inverter state, the control signal adjusts the duty ratio of the first switch, the second switch, the fifth switch and the sixth switch , inverting the DC power on the DC circuit side to a single-phase AC power and sending it to the AC grid side.
根据权利要求12所述的兼容单相和三相交流输入的PFC电路的控制方法，其特征在于，步骤S2中，控制所述三相工作模式工作在整流状态或逆变状态的方法，包括：The method for controlling a PFC circuit compatible with single-phase and three-phase AC input according to claim 12, wherein in step S2, the method for controlling the three-phase operating mode to work in a rectifying state or an inverting state comprises:

在三相工作模式下，所述控制信号包括电压空间矢量调制方式；In the three-phase working mode, the control signal includes a voltage space vector modulation mode;

通过所述电压空间矢量调制方式调节所述第一开关管、所述第二开关管、所述第三开关管、所述第四开关管、所述第五开关管和所述第六开关管的占空比，控制所述三相工作模式工作在整流状态或逆变状态的方法。The first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch are adjusted by the voltage space vector modulation method A method of controlling the three-phase working mode to work in a rectifying state or an inverting state.
根据权利要求12-13任一项所述的兼容单相和三相交流输入的PFC电路的控制方法，其特征在于，在所述单相工作模式或所述三相工作模式下，所述第一开关管、所述第二开关管、所述第三开关管、所述第四开关管、所述第五开关管和所述第六开关管均工作在PWM模式下。The control method for a PFC circuit compatible with single-phase and three-phase AC input according to any one of claims 12 to 13, wherein in the single-phase working mode or the three-phase working mode, the first A switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch all work in a PWM mode.
一种充电机，其特征在于，包括上述权利要求1-9任一项所述的兼容单相和三相交流输入的PFC电路。A charger, characterized in that it comprises the PFC circuit compatible with single-phase and three-phase AC input as described in any one of the above claims 1-9.