Three-phase single-stage alternating current-direct current converter, and control method and apparatus therefor

Abstract

Disclosed in the present invention are a three-phase single-stage alternating current-direct current converter, and a control method and apparatus therefor, which are used for improving the conversion efficiency and power density of alternating current-direct current converters. Said converter comprises a three-phase matrix switch circuit, a resonant circuit, an isolation circuit and a rectification circuit. The three-phase matrix switch circuit is connected to three-phase alternating current, and comprises three independently arranged switch branches; each switch branch comprises an upper bridge arm and a lower bridge arm, a midpoint of the upper bridge arm and the lower bridge arm in each switch branch being connected to one-phase alternating current input, and each bridge arm comprising a bidirectional switch assembly or two switch assemblies connected in reverse series. The resonant circuit comprises a resonant capacitor, a resonant inductor and an excitation inductor connected in series, and is connected between a common endpoint of the upper bridge arms and a common endpoint of the lower bridge arms of the three switch branches. The isolation circuit has one side connected to the resonant circuit, and one side connected to the rectification circuit; the rectification circuit comprises at least two switch assemblies, an input side of which is connected to the isolation circuit, and an output side of which is connected to a load device.

Description

Three-phase single-stage AC-DC converter and control method, device and equipment thereof

[0001] The present application claims priority to the Chinese patent application No. 2024113055203, filed on September 18, 2024, and entitled "Three-phase single-stage AC-DC converter and control method, device and equipment thereof", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of power converter, in particular to a three-phase single-stage AC-DC converter and control method, device, equipment, medium and program product thereof. BACKGROUND

[0003] The traditional AC-DC converter, as shown in FIG. 1, usually adopts a two-stage topology of PFC circuit and DC-DC conversion circuit.

[0004] The front-stage PFC circuit is used to control the input current, realizing high PF and low THD, and the rear-stage DC-DC conversion circuit is used to control the output voltage and current, ensuring the stability of the output voltage and current under different working conditions.

[0005] However, the two-stage topology needs two-stage switching devices and intermediate bus capacitor C bus , which limits the conversion efficiency and power density of the converter to a certain extent. SUMMARY

[0006] The present application provides a three-phase single-stage AC-DC converter and control method, device, equipment, medium and program product thereof, to improve the conversion efficiency and power density of the AC-DC converter.

[0007] In a first aspect, the present application provides a three-phase single-stage AC-DC converter, comprising: a three-phase matrix switch circuit, a resonance circuit, an isolation circuit and a rectifier circuit, wherein,

[0008] The three-phase matrix switch circuit is connected to a three-phase AC power, and comprises three independently arranged switch branches, each switch branch comprising an upper bridge arm and a lower bridge arm, and the midpoint of the upper bridge arm and the lower bridge arm in each switch branch is connected to a phase AC input, and each bridge arm comprises a bidirectional switch component or two reverse series connected switch components.

[0009] The resonant circuit comprises a resonant capacitor, a resonant inductor and an excitation inductor connected in series, and is connected between the common end point of the upper bridge arms and the common end point of the lower bridge arms of the three switch branches.

[0010] The isolation circuit is connected with the resonant circuit on one side and connected with the rectifier circuit on the other side.

[0011] The rectifier circuit comprises at least two switch components, and the input side is connected with the isolation circuit, and the output side is connected with the load device.

[0012] Compared with the traditional AC-DC converter, the three-phase single-stage AC-DC converter only needs one switch network and does not need to set an intermediate bus capacitor, and has higher conversion efficiency and higher power density.

[0013] In a possible implementation, the converter further comprises a three-phase filter circuit connected between the three-phase AC and the three-phase matrix switch circuit, and the three-phase filter circuit comprises three filter branches, each of which is connected with one phase of the AC input.

[0014] In a possible implementation, the converter further comprises a filter capacitor connected between the rectifier circuit and the load device, and used for filtering the output of the rectifier circuit.

[0015] In a possible implementation, the rectifier circuit comprises a full-bridge rectifier circuit and a half-bridge rectifier circuit.

[0016] In a possible implementation, the isolation circuit comprises a transformer, the primary side of the transformer is connected in parallel with the excitation inductor, and the secondary side of the transformer is connected with the rectifier circuit.

[0017] In a second aspect, an embodiment of the present application provides a control method applied to the three-phase single-stage AC-DC converter provided in the first aspect, and the method comprises the following steps.

[0018] Real-time acquisition of input parameters of the three-phase AC and output parameters of the rectifier circuit;

[0019] Based on the input parameters of the three-phase AC, duty cycles of the phase drive signals are determined respectively;

[0020] Based on the output parameters of the rectifier circuit, the wave generation parameters of the rectifier circuit are determined;

[0021] According to the determined duty cycles of the phase drive signals and the wave generation parameters of the rectifier circuit, the drive signals of the three-phase matrix switch circuit and each switch component in the rectifier circuit are generated respectively;

[0022] Each switch component is driven by the generated drive signal of the switch component.

[0023] In the control method, on one hand, input parameters of the three-phase alternating current are acquired in real time, and duty cycles of the phase driving signals are determined based on the acquired input parameters, and the driving signals are generated according to the duty cycles of the phase driving signals, and the switching components of the corresponding switching branches are controlled, so as to realize the control of the three-phase alternating current input current; on the other hand, the output parameters of the rectifier circuit are acquired, and the wave generation parameters of the rectifier circuit are determined according to the output parameters of the rectifier circuit, and the driving signals are generated according to the wave generation parameters, and the corresponding switching components in the rectifier circuit are controlled, so as to realize the control of the output voltage and the output current.

[0024] The control method provided by the embodiment of the application can control the input current, the output voltage and the output current, so that the three-phase single-stage AC-DC converter has strong harmonic suppression capability, the THD of the input current is small, all the switching components can realize soft turn-on, and the efficiency of the three-phase single-stage AC-DC converter is improved.

[0025] In a possible implementation, the duty cycles of the phase driving signals are determined based on the input parameters of the three-phase alternating current, and the method comprises the following steps.

[0026] The voltage sector of the three-phase alternating current is determined based on the input parameters of the three-phase alternating current.

[0027] The corresponding relationship between the three phases of the three-phase alternating current and the L phase, the M phase and the S phase is determined according to the voltage sector of the three-phase alternating current, wherein when the input parameters comprise phase voltages of the three phases of the three-phase alternating current, the absolute value of the phase voltage of the L phase is the largest among the three-phase phase voltages, the absolute value of the phase voltage of the S phase is the smallest among the three-phase phase voltages, and the absolute value of the phase voltage of the M phase is smaller than the absolute value of the phase voltage of the L phase and larger than the absolute value of the phase voltage of the S phase.

[0028] The duty cycles of the L phase driving signal, the M phase driving signal and the S phase driving signal are determined according to the input parameters of the three-phase alternating current.

[0029] The duty cycles of the phase driving signals of the three phases of the three-phase alternating current are determined based on the corresponding relationship between the three phases of the three-phase alternating current and the L phase, the M phase and the S phase and the duty cycles of the L phase driving signal, the M phase driving signal and the S phase driving signal.

[0030] In a possible implementation, the duty cycles of the L phase driving signal, the M phase driving signal and the S phase driving signal are determined according to the input parameters of the three-phase alternating current, and the method comprises the following steps.

[0031] The duty cycle of the target phase driving signal is determined according to the input parameters of the three-phase alternating current, wherein the target phase is the M phase or the S phase.

[0032] determine the duty ratio of the other phase driving signal based on the duty ratio of the target phase driving signal and a preset duty ratio of the L-phase driving signal.

[0033] In a possible implementation, the input parameters include phase voltages of each phase of the three-phase alternating current;

[0034] The method further includes determining the duty ratio of the target phase driving signal based on the input parameters of the three-phase alternating current.

[0035] In a possible implementation, the input parameters include phase voltages and phase currents of each phase of the three-phase alternating current;

[0036] The method further includes determining the duty ratio of the target phase driving signal based on the input parameters of the three-phase alternating current.

[0037] determine a given value of the duty ratio based on a ratio of the target phase voltage to the L-phase voltage;

[0038] determine a feedback value of the duty ratio based on a ratio of the target phase current to the L-phase current;

[0039] correct the given value of the duty ratio by using the feedback value of the duty ratio to obtain a target value;

[0040] input the target value into a current loop regulator to obtain the duty ratio of the target phase driving signal.

[0041] In a possible implementation, the input parameters include phase voltages and phase currents of each phase of the three-phase alternating current;

[0042] The method further includes determining the duty ratio of the target phase driving signal based on the input parameters of the three-phase alternating current.

[0043] determine an initial value of the duty ratio of the target phase driving signal based on the phase voltages of each phase;

[0044] determine a given value of the duty ratio based on a ratio of the target phase voltage to the L-phase voltage, and determine a feedback value of the duty ratio based on a ratio of the target phase current to the L-phase current; correct the given value of the duty ratio by using the feedback value of the duty ratio to obtain a target value; and input the target value into a current loop regulator to obtain a regulation amount of the duty ratio of the target phase driving signal.

[0045] correct the initial value of the duty ratio of the target phase driving signal by using the regulation amount of the duty ratio of the target phase driving signal to obtain the duty ratio of the target phase driving signal.

[0046] In the control method, the phase voltage and the phase current of each phase of the three-phase alternating current are obtained, and then the duty cycle initial value and the adjustment amount of the target phase driving signal are calculated, and the duty cycle initial value is adjusted by using the adjustment amount to obtain the final duty cycle of the target phase driving signal, so that the calculated duty cycle is more accurate, and accurate control of the input current THD is realized.

[0047] In a possible implementation, the output parameter includes an output voltage.

[0048] The method further includes determining the wave generation parameter of the rectifier circuit according to the output parameter of the rectifier circuit.

[0049] The output voltage error value is determined based on the output voltage and a preconfigured reference voltage.

[0050] The output voltage error value is input into a voltage loop regulator to obtain the wave generation parameter of the rectifier circuit.

[0051] In a possible implementation, the output parameter includes an output current.

[0052] The method further includes determining the wave generation parameter of the rectifier circuit according to the output parameter of the rectifier circuit.

[0053] The output current error value is determined based on the output current and a preconfigured reference current.

[0054] The output current error value is input into a current loop regulator to obtain the wave generation parameter of the rectifier circuit.

[0055] In a possible implementation, the output parameter includes an output voltage and an output current.

[0056] The method further includes determining the wave generation parameter of the rectifier circuit according to the output parameter of the rectifier circuit.

[0057] The output voltage error value is determined based on the output voltage and a preconfigured reference voltage.

[0058] The output current reference value is obtained by inputting the output voltage error value into a voltage loop regulator.

[0059] The output current error value is determined based on the output current and the output current reference value.

[0060] The output current error value is input into a current loop regulator to obtain the wave generation parameter of the rectifier circuit.

[0061] In the control method, the output voltage and the output current of the rectifier circuit are acquired, the wave emitting parameter of the rectifier circuit is calculated, the driving signal of the switching component in the rectifier circuit is generated according to the wave emitting parameter, that is, the state of the switching component in the rectifier circuit is controlled by feedback adjustment, so that the gain of the LLC can be adjusted, and the output voltage and the output current of the rectifier circuit can be controlled.

[0062] In a possible implementation, the wave emitting parameter includes a wave emitting frequency and a wave emitting phase shift angle.

[0063] In a third aspect, an embodiment of the present application provides a control device applied to the three-phase single-stage AC-DC converter provided in the first aspect, and the device includes:

[0064] An acquisition unit is configured to acquire the input parameter of the three-phase alternating current and the output parameter of the rectifier circuit in real time.

[0065] A first processing unit is configured to determine the duty cycle of each phase driving signal based on the input parameter of the three-phase alternating current.

[0066] A second processing unit is configured to determine the wave emitting parameter of the rectifier circuit according to the output parameter of the rectifier circuit.

[0067] A signal generation unit is configured to generate the driving signal of each switching component in the three-phase matrix switching circuit and the rectifier circuit according to the determined duty cycle of each phase driving signal and the wave emitting parameter of the rectifier circuit.

[0068] A driving unit is configured to drive the corresponding switching component by using the generated driving signal of each switching component.

[0069] In a possible implementation, the first processing unit is specifically configured to:

[0070] determine the voltage sector of the three-phase alternating current based on the input parameter of the three-phase alternating current.

[0071] determine the corresponding relationship between the three phases of the three-phase alternating current and the L phase, the M phase and the S phase according to the voltage sector of the three-phase alternating current, wherein when the input parameter includes the phase voltage of each phase of the three-phase alternating current, the absolute value of the phase voltage of the L phase is the largest among the three-phase phase voltages, the absolute value of the phase voltage of the S phase is the smallest among the three-phase phase voltages, and the absolute value of the phase voltage of the M phase is smaller than the absolute value of the phase voltage of the L phase and larger than the absolute value of the phase voltage of the S phase.

[0072] determine the duty cycle of the L phase driving signal, the M phase driving signal and the S phase driving signal respectively according to the input parameter of the three-phase alternating current.

[0073] determine the duty cycle of the driving signal of each phase of the three-phase alternating current based on the correspondence relationship between the three phases of the three-phase alternating current and the L phase, the M phase and the S phase, and the duty cycles of the driving signals of the L phase, the M phase and the S phase.

[0074] In a possible implementation, the first processing unit is specifically configured to:

[0075] determine the duty cycle of the target-phase driving signal according to the input parameter of the three-phase alternating current, wherein the target phase is the M phase or the S phase;

[0076] determine the duty cycle of the another-phase driving signal based on the duty cycle of the target-phase driving signal and a preset duty cycle of the L-phase driving signal.

[0077] In a possible implementation, the input parameter includes phase voltages of each phase of the three-phase alternating current.

[0078] The first processing unit is specifically configured to determine the duty cycle of the target-phase driving signal based on the phase voltages of each phase.

[0079] In a possible implementation, the input parameter includes phase voltages and phase currents of each phase of the three-phase alternating current.

[0080] The first processing unit is specifically configured to:

[0081] determine a given value of the duty cycle based on a ratio of the target-phase voltage to the L-phase voltage;

[0082] determine a feedback value of the duty cycle based on a ratio of the target-phase current to the L-phase current;

[0083] correct the given value of the duty cycle by using the feedback value of the duty cycle to obtain a target value;

[0084] input the target value into a current loop regulator to obtain the duty cycle of the target-phase driving signal.

[0085] In a possible implementation, the input parameter includes phase voltages and phase currents of each phase of the three-phase alternating current.

[0086] The first processing unit is specifically configured to:

[0087] determine an initial value of the duty cycle of the target-phase driving signal based on the phase voltages of each phase;

[0088] determine a given value of the duty cycle based on a ratio of the target-phase voltage to the L-phase voltage, and determine a feedback value of the duty cycle based on a ratio of the target-phase current to the L-phase current; correct the given value of the duty cycle by using the feedback value of the duty cycle to obtain a target value, and input the target value into a current loop regulator to obtain an adjustment amount of the duty cycle of the target-phase driving signal.

[0089] The duty cycle of the target phase driving signal is adjusted based on the duty cycle adjustment amount of the target phase driving signal, and the duty cycle of the target phase driving signal is corrected based on the initial value of the duty cycle of the target phase driving signal to obtain the duty cycle of the target phase driving signal.

[0090] In a possible implementation, the output parameter includes an output voltage.

[0091] The second processing unit is specifically configured to:

[0092] An output voltage error value is determined based on the output voltage and a preconfigured reference voltage.

[0093] The output voltage error value is input into a voltage loop regulator to obtain a wave generation parameter of the rectifier circuit.

[0094] In a possible implementation, the output parameter includes an output current.

[0095] The second processing unit is specifically configured to:

[0096] An output current error value is determined based on the output current and a preconfigured reference current.

[0097] The output current error value is input into a current loop regulator to obtain a wave generation parameter of the rectifier circuit.

[0098] In a possible implementation, the output parameter includes an output voltage and an output current.

[0099] The second processing unit is specifically configured to:

[0100] An output voltage error value is determined based on the output voltage and a preconfigured reference voltage.

[0101] The output voltage error value is input into a voltage loop regulator to obtain an output current reference value.

[0102] An output current error value is determined based on the output current and the output current reference value.

[0103] The output current error value is input into a current loop regulator to obtain a wave generation parameter of the rectifier circuit.

[0104] In a possible implementation, the wave generation parameter includes a wave generation frequency and a wave generation phase shift angle.

[0105] In a fourth aspect, an embodiment of the present application provides a control device applied to the three-phase single-stage AC-DC converter in the first aspect, and the device includes:

[0106] The sampling module is configured to acquire, in real time, an input parameter of three-phase alternating current and an output parameter of the rectifier circuit.

[0107] a processing module, configured to determine duty cycles of the phase driving signals respectively based on input parameters of the three-phase alternating current, and determine a wave generation parameter of the rectifier circuit according to output parameters of the rectifier circuit;

[0108] a pulse width modulation (PWM) generation module, configured to generate driving signals of each switching component in the three-phase matrix switch circuit and the rectifier circuit respectively according to the determined duty cycles of the phase driving signals and the wave generation parameter of the rectifier circuit, and drive the corresponding switching components respectively by using the generated driving signals of each switching component.

[0109] In a fifth aspect, an embodiment of the present application provides an electronic device, which comprises a processor and a memory, the memory is configured to store a program executable by the processor, and the processor is configured to read the program in the memory and execute the method in any one of the second aspect.

[0110] In a sixth aspect, an embodiment of the present application further provides a computer storage medium, which stores a computer program, and the program is executed by a processor to implement the steps of the method in the second aspect.

[0111] In a seventh aspect, the present application provides a computer program product, which comprises computer program code, and when the computer program code is executed on a computer, the computer program code causes the computer to execute the method in any one of the second aspect.

[0112] The technical effects that can be achieved by each of the third aspect, the fourth aspect, the fifth aspect, the sixth aspect and the seventh aspect described above can refer to the technical effects that can be achieved by each of the possible schemes of the second aspect described above, and thus will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0113] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0114] FIG. 1 is a structural schematic diagram of a conventional AC-DC converter in the related art;

[0115] FIG. 2 is a structural schematic diagram of a three-phase single-stage AC-DC converter provided by an embodiment of the present application;

[0116] FIG. 3 is a schematic flowchart of a control method of a three-phase single-stage AC-DC converter provided by an embodiment of the present application;

[0117] Fig. 4 is a schematic diagram of L phase, M phase and S phase provided by an embodiment of the present application;

[0118] Fig. 5 is a schematic diagram of a principle of determining a duty cycle of a target phase driving signal provided by an embodiment of the present application;

[0119] Fig. 6 is a schematic diagram of a principle of determining a duty cycle of a target phase driving signal provided by another embodiment of the present application;

[0120] Fig. 7 is a schematic diagram of a principle of determining a duty cycle of a target phase driving signal provided by yet another embodiment of the present application;

[0121] Fig. 8 is a schematic diagram of a principle of determining a duty cycle of a target phase driving signal provided by yet another embodiment of the present application;

[0122] Fig. 9 is a schematic diagram of a principle of determining a duty cycle of a target phase driving signal provided by yet another embodiment of the present application;

[0123] Fig. 10 is a schematic diagram of a principle of determining a duty cycle of a target phase driving signal provided by yet another embodiment of the present application;

[0124] Fig. 11 is a schematic diagram of a principle of determining a wave emitting parameter of a rectifier circuit provided by an embodiment of the present application;

[0125] Fig. 12 is a schematic diagram of a principle of determining a wave emitting parameter of a rectifier circuit provided by another embodiment of the present application;

[0126] Fig. 13 is a schematic diagram of a principle of determining a wave emitting parameter of a rectifier circuit provided by yet another embodiment of the present application;

[0127] Fig. 14 is a schematic flow chart of a specific implementation process of a control method of a three-phase single-stage AC / DC converter provided by an embodiment of the present application;

[0128] Fig. 15 is a schematic diagram of a principle of a control method of a three-phase single-stage AC / DC converter provided by an embodiment of the present application;

[0129] Fig. 16 is a schematic diagram of a principle of a control method of a three-phase single-stage AC / DC converter provided by another embodiment of the present application;

[0130] Fig. 17 is a schematic diagram of a driving signal of a switching component in a three-phase matrix switching circuit provided by an embodiment of the present application;

[0131] Fig. 18 is a schematic diagram of a driving signal of a switching component in a rectifier circuit provided by an embodiment of the present application;

[0132] Fig. 19 is a schematic diagram of a switching state of an A phase upper arm switching component provided by an embodiment of the present application;

[0133] Fig. 20 is a schematic diagram of a switch state of a B-phase upper bridge arm switch assembly according to an embodiment of the present application;

[0134] Fig. 21 is a schematic diagram of a switch state of a B-phase upper bridge arm switch assembly according to an embodiment of the present application;

[0135] Fig. 22 is a schematic diagram of input and output voltage and current waveforms according to an embodiment of the present application;

[0136] Fig. 23 is a schematic diagram of Fourier analysis of input current according to an embodiment of the present application;

[0137] Fig. 24 is a schematic diagram of another input and output voltage and current waveforms according to an embodiment of the present application;

[0138] Fig. 25 is a schematic diagram of another Fourier analysis of input current according to an embodiment of the present application;

[0139] Fig. 26 is a schematic diagram of a control device of a three-phase single-stage AC-DC converter according to an embodiment of the present application;

[0140] Fig. 27 is a schematic diagram of another control device of a three-phase single-stage AC-DC converter according to an embodiment of the present application;

[0141] Fig. 28 is a schematic diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0142] In order to make the objects, technical solutions and advantages of the present application clearer, the following will further describe the present application with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0143] In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B; the "and / or" in the text only represents a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0144] Hereinafter, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more features.

[0145] Before introducing the three-phase single-stage AC-DC converter and the control scheme thereof provided by the embodiments of the present application, in order to facilitate understanding, first, the technical background of the embodiments of the present application is introduced in detail.

[0146] The conventional AC-DC converter, as shown in FIG. 1, usually adopts a two-stage topology of PFC circuit and DC-DC conversion circuit. The former PFC circuit is used for controlling the input current, realizing high PF and low THD, and the latter DC-DC conversion circuit is used for controlling the output voltage and current, ensuring the stability of the output voltage and current under different working conditions.

[0147] However, the two-stage topology needs two-stage switching devices and intermediate bus capacitor C bus , which limits the conversion efficiency and power density of the converter to a certain extent.

[0148] In view of this, the embodiments of the present application provide a three-phase single-stage AC-DC converter and a control method, device, equipment, medium and program product thereof. Compared with the conventional AC-DC converter, only one-stage switching network is needed, and no intermediate bus capacitor needs to be set, and it has higher conversion efficiency and higher power density.

[0149] In addition, considering that the three-phase single-stage AC-DC converter has only one-stage switching network, it needs to meet the control of input current THD, PF, and also needs to meet the control of output voltage and input current, and also needs to meet the soft turn-on of the whole network switching component to improve the efficiency, it is difficult to meet the control of the above three in the prior art. The existing control method, for the control of input current, usually realizes by the way of width modulation, for the control of output voltage and output current, usually realizes by the way of phase shift, this kind of control mode, when high voltage input and low voltage output, the gain of LLC is too large, the phase shift angle needs to be increased to reduce the gain of LLC, and the too large phase shift angle is easy to make LLC lose the soft turn-on condition, reduce the efficiency of the converter, therefore, the application scene in the wide input and output voltage range will be limited.

[0150] Therefore, the embodiments of the present application provide a control method of three-phase single-stage AC-DC converter, on the one hand, by acquiring the input parameters of three-phase alternating current in real time, and then determining the duty cycle of each phase driving signal based on the acquired input parameters, and generating a driving signal according to the duty cycle of each phase driving signal, controlling the switching component of the corresponding switching branch, thereby realizing the control of three-phase alternating current input current; on the other hand, by acquiring the output parameters of the rectifier circuit, and then determining the wave generation parameters of the rectifier circuit according to the output parameters of the rectifier circuit, and generating a driving signal according to the wave generation parameters, controlling the corresponding switching component in the rectifier circuit, thereby realizing the control of the output voltage and output current.

[0151] By controlling the input current, the output voltage and the output current, the three-phase single-stage AC-DC converter has strong harmonic suppression capability, the THD of the input current is small, all the switching components can realize soft turn-on, and the efficiency of the three-phase single-stage AC-DC converter is improved.

[0152] By controlling the input current, the output voltage and the output current, the three-phase single-stage AC-DC converter has strong harmonic suppression capability, the THD of the input current is small, all the switching components can realize soft turn-on, and the efficiency of the three-phase single-stage AC-DC converter is improved.

[0153] After introducing the background of the embodiment of the application, the three-phase single-stage AC-DC converter provided by the embodiment of the application will be described in detail in combination with specific embodiments.

[0154] Referring to Fig. 2, which is a structural schematic diagram of a three-phase single-stage AC-DC converter in the embodiment of the application, the three-phase single-stage AC-DC converter comprises a three-phase matrix switch circuit 21, a resonant circuit 22, an isolation circuit 23 and a rectifier circuit 24.

[0155] The three-phase matrix switch circuit 21 is connected to three-phase AC power and comprises three independently arranged switching branches. Each switching branch comprises an upper bridge arm and a lower bridge arm. The midpoints of the upper bridge arm and the lower bridge arm in each switching branch are connected to one phase of AC input. Each bridge arm comprises one bidirectional switching component or two switching components connected in anti-parallel. The switching component can be a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube switching component comprising an anti-parallel diode.

[0156] The resonant circuit 22 comprises a resonant capacitor C r , a resonant inductor L r 1 and an excitation inductor L r 2 connected in series and connected between the common points of the upper bridge arms and the common points of the lower bridge arms of the three switching branches.

[0157] The isolation circuit 23 is connected to the resonant circuit 22 at one side and connected to the rectifier circuit 24 at the other side.

[0158] The rectifier circuit 24 comprises at least two switching components. The input side of the rectifier circuit 24 is connected to the isolation circuit 23, and the output side of the rectifier circuit 24 is connected to a load device. Of course, the output side of the rectifier circuit 24 can also be connected to a DC power supply. The switching component can be a MOS tube switching component comprising an anti-parallel diode.

[0159] In a possible implementation, the converter further comprises a three-phase filter circuit 25 connected between the three-phase alternating current and the three-phase matrix switch circuit 21, and comprising three filter branches, each filter branch being connected to one phase of the alternating current input.

[0160] It should be noted that the filter capacitor can be connected in a delta configuration or a star configuration, and the embodiments of the present application do not limit the same.

[0161] In a possible implementation, the converter further comprises a filter capacitor C o connected between the rectifier circuit 24 and the load device, and configured to filter the output of the rectifier circuit 24.

[0162] In a possible implementation, the rectifier circuit 24 comprises a full-bridge rectifier circuit and a half-bridge rectifier circuit. The rectifier circuit shown in FIG. 2 is a full-bridge rectifier circuit and comprises four switching components. In actual applications, a half-bridge rectifier circuit comprising two switching components can be used.

[0163] In a possible implementation, the isolation circuit 23 comprises a transformer, and a primary side of the transformer is connected in parallel with the excitation inductor L r 2, and a secondary side of the transformer is connected to the rectifier circuit 24. The transformer can be a high-frequency isolation transformer.

[0164] It should be noted that the excitation inductor in the resonant circuit 22 can be an excitation inductor separately arranged or an excitation inductor reused from the transformer, and the embodiments of the present application do not limit the same.

[0165] After introducing the three-phase single-stage AC-DC converter provided by the embodiments of the present application, the control method of the three-phase single-stage AC-DC converter provided by the embodiments of the present application is described in detail in combination with specific embodiments.

[0166] It should be noted that the control method of the three-phase single-stage AC-DC converter provided by the embodiments of the present application is not only applicable to the three-phase single-stage AC-DC converter provided by the above embodiments of the present application, but also applicable to other three-phase single-stage AC-DC converters comprising a full-bridge LLC resonant network. The AC-DC converter can be a voltage-type converter or a current-type converter.

[0167] Referring to FIG. 3, which is an implementation flowchart of the control method of the three-phase single-stage AC-DC converter in the embodiments of the present application, the specific implementation flow of the method is as follows S301-S305:

[0168] S301, real-time acquisition of input parameters of the three-phase alternating current and output parameters of the rectifier circuit.

[0169] In a specific implementation, the input parameters of the three-phase alternating current can include only phase voltages of each phase of the three-phase alternating current, or can include both phase voltages of each phase of the three-phase alternating current and phase currents of each phase of the three-phase alternating current.

[0170] When the input parameters include the phase voltages of each phase of the three-phase alternating current, the three line voltages of the three-phase alternating current input can be sampled respectively, and then the line voltages are converted into phase voltages, or two line voltages of the three-phase alternating current input can be sampled, and then the line voltages are converted into phase voltages, and then the phase voltage of the third phase is calculated by using the two calculated phase voltages, which is not limited by the embodiments of the present application.

[0171] Similarly, when the input parameters include the phase currents of each phase of the three-phase alternating current, the three phase currents of the three-phase alternating current input can be sampled respectively, or two phase currents of the three-phase alternating current input can be sampled, and then the phase current of the third phase is calculated, which is not limited by the embodiments of the present application.

[0172] It should be noted that the output parameters of the rectifier circuit can be only the output voltage of the rectifier circuit, or only the output current of the rectifier circuit, or both the output voltage and the output current of the rectifier circuit.

[0173] When the output voltage of the rectifier circuit is specifically obtained, the output side of the rectifier circuit can be sampled to obtain the output voltage, and when the output current of the rectifier circuit is specifically obtained, the sampling point of the output current can be set on the filter capacitor C o After that, the sampling point of the output current can also be set on the filter capacitor C o between the rectifier circuit and the transformer, the current of the rectifier bridge switching component on the secondary side of the transformer, the current of the three-phase switching component on the primary side of the transformer, or the differential voltage of the resonance capacitor, and then the resonance capacitor current is calculated by using the following formula (1). Since the resonance capacitor and the resonance inductor are in the same current loop, their currents are equal. After the resonance capacitor current is calculated, the resonance current i Lr is obtained. cr The currents obtained by the above-mentioned sampling methods can be equivalent to the output current to some extent, and the specific sampling method of the output current is not limited by the embodiments of the present application.

[0174] S302, based on the input parameters of the three-phase alternating current, the duty cycle of each phase driving signal is determined.

[0175] Based on the input parameters of the three-phase alternating current, the duty cycles of the driving signals of the respective phases are determined. First, based on the obtained input parameters of the three-phase alternating current, the voltage sector of the three-phase alternating current is determined, and according to the voltage sector of the three-phase alternating current, the correspondence between the three phases of the three-phase alternating current and the L phase, the M phase and the S phase is determined. When the input parameters include the phase voltages of the respective phases of the three-phase alternating current, the absolute value of the phase voltage of the L phase is the largest among the three-phase voltages, the absolute value of the phase voltage of the S phase is the smallest among the three-phase voltages, and the absolute value of the phase voltage of the M phase is smaller than the absolute value of the phase voltage of the L phase and larger than the absolute value of the phase voltage of the S phase.

[0176] Suppose the three phases of the three-phase alternating current are A phase, B phase and C phase, and the L phase mentioned in the embodiment of the present application refers to the phase corresponding to the largest absolute value of the three-phase voltage, the S phase refers to the phase corresponding to the smallest absolute value of the three-phase voltage, and the M phase refers to the phase whose absolute value of the phase voltage is smaller than the absolute value of the phase voltage of the L phase and larger than the absolute value of the phase voltage of the S phase. By determining the voltage sector of the three-phase alternating current, the correspondence between the three phases of the three-phase alternating current and the L phase, the M phase and the S phase can be determined. The method for determining the voltage sector according to the three-phase voltage can use the existing method, which is not limited in the embodiment of the present application.

[0177] The L phase, the M phase and the S phase change with the alternating cycle of the three-phase alternating current, in other words, the correspondence between the A phase, the B phase, the C phase and the L phase, the M phase and the S phase changes periodically. In an example, as shown in FIG. 4, in the t1 time period, the A phase is the L phase, the C phase is the S phase, and the B phase is the M phase. In the t2 time period, the C phase is the L phase, the A phase is the S phase, and the B phase is the M phase.

[0178] After determining the correspondence between the three phases of the three-phase alternating current and the L phase, the M phase and the S phase, the duty cycles of the driving signals of the L phase, the M phase and the S phase can be determined according to the input parameters of the three-phase alternating current, and then the duty cycles of the driving signals of the respective phases of the three-phase alternating current can be determined based on the correspondence between the three phases of the three-phase alternating current and the L phase, the M phase and the S phase and the duty cycles of the driving signals of the L phase, the M phase and the S phase.

[0179] According to the input parameters of the three-phase alternating current, the duty cycles of the driving signals of the L phase, the M phase and the S phase are determined. The duty cycle of the driving signal of the target phase can be determined according to the input parameters of the three-phase alternating current, and then the duty cycle of the driving signal of another phase can be determined based on the duty cycle of the driving signal of the target phase and the preset duty cycle of the driving signal of the L phase. The target phase is the M phase or the S phase, and the preset duty cycle of the driving signal of the L phase can be any value greater than 0 and less than or equal to 0.5, for example, the preset duty cycle of the driving signal of the L phase is 0.5, 0.45 or 0.1.

[0180] In a specific implementation, the duty cycle of the another phase driving signal is determined based on the duty cycle of the target phase driving signal and the preset duty cycle of the L phase driving signal. If the target phase is the M phase, the another phase is the S phase, and the duty cycle of the S phase driving signal is equal to the difference between the preset duty cycle of the L phase driving signal and the duty cycle of the M phase driving signal. If the target phase is the S phase, the another phase is the M phase, and the duty cycle of the M phase driving signal is equal to the difference between the preset duty cycle of the L phase driving signal and the duty cycle of the S phase driving signal.

[0181] In actual applications, when the duty cycle of the target phase driving signal is determined according to the input parameters of the three-phase alternating current, the determination can include, but is not limited to, the following implementation manners according to different input parameters.

[0182] In the first implementation, the input parameters include the phase voltages of the phases of the three-phase alternating current.

[0183] In this implementation, the duty cycle of the target phase driving signal is determined according to the phase voltages of the phases of the three-phase alternating current.

[0184] For example, when the target phase is the M phase, the duty cycle of the M phase driving signal is determined based on the phase voltages of the phases, which can be calculated by the formula K*VM / (VM+VS) or K*VM / VL, or can be realized by an existing manner, which is not limited in the embodiments of the present application. K is a constant preset, VM is the M phase voltage, VS is the S phase voltage, VL is the L phase voltage, and VL=VM+VS.

[0185] Similarly, when the target phase is the S phase, the duty cycle of the M phase driving signal is determined based on the phase voltages of the phases, which can be calculated by the formula K*VS / (VM+VS) or K*VS / VL, or can be realized by an existing manner, which is not limited in the embodiments of the present application. K is a constant preset, VM is the M phase voltage, VS is the S phase voltage, VL is the L phase voltage, and VL=VM+VS.

[0186] In the second implementation, the input parameters include the phase voltages and phase currents of the phases of the three-phase alternating current.

[0187] In this implementation, when the duty cycle of the target phase driving signal is determined according to the phase voltages and phase currents of the phases of the three-phase alternating current, it can be divided into the following two cases:

[0188] Case 1, as shown in Figure 5, taking the target phase as M phase as an example, according to the phase voltage and phase current of each phase of the three-phase alternating current, the duty cycle of the M phase driving signal is determined, the duty cycle given value is determined based on the ratio of the M phase voltage to the L phase voltage, the duty cycle feedback value is determined based on the ratio of the M phase current to the L phase current, the duty cycle feedback value is used to correct the duty cycle given value, that is, the difference between the duty cycle given value and the duty cycle feedback value is calculated to obtain a target value, the target value is input into the current loop regulator to obtain the duty cycle of the M phase driving signal.

[0189] It should be noted that the current loop regulator mentioned in the embodiments of the present application can be a proportional integral (PI) regulator, a proportional integral derivative (PID) regulator or other general-purpose regulators. The current loop regulator and the voltage loop regulator mentioned below can also use the above-mentioned regulators, which will not be described one by one.

[0190] As shown in Figure 6, taking the target phase as S phase as an example, according to the phase voltage and phase current of each phase of the three-phase alternating current, the duty cycle of the S phase driving signal is determined, the duty cycle given value is determined based on the ratio of the S phase voltage to the L phase voltage, the duty cycle feedback value is determined based on the ratio of the S phase current to the L phase current, the duty cycle feedback value is used to correct the duty cycle given value, that is, the difference between the duty cycle given value and the duty cycle feedback value is calculated to obtain a target value, the target value is input into the current loop regulator to obtain the duty cycle of the S phase driving signal.

[0191] Case 2, first, based on the phase voltage of each phase, the initial value of the duty cycle of the target phase driving signal is determined, then the duty cycle given value is determined based on the ratio of the target phase voltage to the L phase voltage, the duty cycle feedback value is determined based on the ratio of the target phase current to the L phase current, the duty cycle feedback value is used to correct the duty cycle given value, the target value is obtained, the target value is input into the current loop regulator to obtain the duty cycle adjustment amount of the target phase driving signal, finally, the initial value of the duty cycle of the target phase driving signal is corrected by using the duty cycle adjustment amount of the target phase driving signal, and the duty cycle of the target phase driving signal is obtained.

[0192] In this case, according to the target phase used to calculate the duty cycle adjustment amount and the initial value of the duty cycle, the following four situations can be combined:

[0193] (1) The initial value of the duty cycle is the initial value of the M phase duty cycle, and the duty cycle adjustment amount is the M phase duty cycle adjustment amount.

[0194] As shown in Fig. 7, firstly, the duty cycle initial value of the M-phase driving signal is determined based on the phase voltage of each phase, then the duty cycle given value is determined based on the ratio of the M-phase phase voltage to the L-phase phase voltage, the duty cycle feedback value is determined based on the ratio of the M-phase phase current to the L-phase phase current, the duty cycle given value is corrected by using the duty cycle feedback value, that is, the difference between the duty cycle given value and the duty cycle feedback value is calculated to obtain a target value, the target value is input into the current loop regulator to obtain the duty cycle adjustment amount of the M-phase driving signal, and finally the duty cycle initial value of the M-phase driving signal is corrected by using the duty cycle adjustment amount of the M-phase driving signal, that is, the sum of the duty cycle initial value and the duty cycle adjustment amount is calculated to obtain the duty cycle of the M-phase driving signal.

[0195] (2) The duty cycle initial value is the M-phase duty cycle initial value, and the duty cycle adjustment amount is the S-phase duty cycle adjustment amount.

[0196] As shown in Fig. 8, firstly, the duty cycle initial value of the M-phase driving signal is determined based on the phase voltage of each phase, then the duty cycle given value is determined based on the ratio of the S-phase phase voltage to the L-phase phase voltage, the duty cycle feedback value is determined based on the ratio of the S-phase phase current to the L-phase phase current, the duty cycle given value is corrected by using the duty cycle feedback value, that is, the difference between the duty cycle given value and the duty cycle feedback value is calculated to obtain a target value, the target value is input into the current loop regulator to obtain the duty cycle adjustment amount of the S-phase driving signal, and finally the duty cycle initial value of the M-phase driving signal is corrected by using the duty cycle adjustment amount of the S-phase driving signal, that is, the difference between the duty cycle initial value and the duty cycle adjustment amount is calculated to obtain the duty cycle of the M-phase driving signal.

[0197] (3) The duty cycle initial value is the S-phase duty cycle initial value, and the duty cycle adjustment amount is the S-phase duty cycle adjustment amount.

[0198] As shown in Fig. 9, firstly, the duty cycle initial value of the M-phase driving signal is determined based on the phase voltage of each phase, then the duty cycle given value is determined based on the ratio of the S-phase phase voltage to the L-phase phase voltage, the duty cycle feedback value is determined based on the ratio of the S-phase phase current to the L-phase phase current, the duty cycle given value is corrected by using the duty cycle feedback value, that is, the difference between the duty cycle given value and the duty cycle feedback value is calculated to obtain a target value, the target value is input into the current loop regulator to obtain the duty cycle adjustment amount of the S-phase driving signal, and finally the duty cycle initial value of the M-phase driving signal is corrected by using the duty cycle adjustment amount of the S-phase driving signal, that is, the difference between the duty cycle initial value and the duty cycle adjustment amount is calculated to obtain the duty cycle of the M-phase driving signal.

[0199] (4) The duty cycle initial value is the S-phase duty cycle initial value, and the duty cycle adjustment amount is the M-phase duty cycle adjustment amount.

[0200] As shown in Fig. 10, firstly, the duty cycle initial value of the S-phase driving signal is determined based on the phase voltage of each phase, then the duty cycle given value is determined based on the ratio of the M-phase phase voltage to the L-phase phase voltage, the duty cycle feedback value is determined based on the ratio of the M-phase phase current to the L-phase phase current, the duty cycle given value is corrected by using the duty cycle feedback value, that is, the difference between the duty cycle given value and the duty cycle feedback value is calculated to obtain a target value, the target value is input into the current loop regulator to obtain the duty cycle adjustment amount of the M-phase driving signal, and finally the duty cycle initial value of the S-phase driving signal is corrected by using the duty cycle adjustment amount of the M-phase driving signal, that is, the difference between the duty cycle initial value and the duty cycle adjustment amount is calculated to obtain the duty cycle of the S-phase driving signal.

[0201] In the above four cases, the way of determining the duty cycle initial value of the target phase (M-phase or S-phase) driving signal based on the phase voltage of each phase is the same as the way of determining the duty cycle of the target phase driving signal according to the phase voltage of each phase of the three-phase alternating current in the above-mentioned embodiment one, which will not be described here.

[0202] S303, determining the wave generation parameter of the rectifier circuit according to the output parameter of the rectifier circuit.

[0203] In specific implementation, the wave generation parameter of the rectifier circuit can be a wave generation frequency or a wave generation phase shift angle, and the embodiments of the present application do not limit this. When the wave generation parameter of the rectifier circuit is determined according to the output parameter of the rectifier circuit, different implementation manners can be used according to different collected output parameters.

[0204] In the first embodiment, the output parameter is an output voltage.

[0205] In this embodiment, as shown in Fig. 11, when the wave generation parameter of the rectifier circuit is determined according to the output parameter of the rectifier circuit, firstly, the output voltage error value is determined based on the output voltage and the pre-configured reference voltage, and then the output voltage error value is input into the voltage loop regulator to obtain the wave generation parameter of the rectifier circuit. The pre-configured reference voltage can be a desired voltage value, for example, if the desired voltage value is 48 volts (V), the pre-configured reference voltage is 48V.

[0206] In the second embodiment, the output parameter is an output current.

[0207] In this embodiment, as shown in Fig. 12, when the wave generation parameter of the rectifier circuit is determined according to the output parameter of the rectifier circuit, firstly, the output current error value is determined based on the output current and the pre-configured reference current, and then the output current error value is input into the current loop regulator to obtain the wave generation parameter of the rectifier circuit. The pre-configured reference current can be a desired current value, for example, if the desired voltage value is 16 amperes (A), the pre-configured reference current is 16A.

[0208] Embodiment three, the output parameter is output voltage and output current.

[0209] In this embodiment, as shown in FIG. 13, when determining the wave generation parameter of the rectifier circuit according to the output parameter of the rectifier circuit, first, the output voltage error value is determined based on the output voltage and the pre-configured reference voltage, the output voltage error value is input into the voltage loop regulator to obtain the output current reference value, then the output current error value is determined based on the output current and the output current reference value, the output current error value is input into the current loop regulator to obtain the wave generation parameter of the rectifier circuit.

[0210] S304, according to the determined duty ratio of each phase driving signal and the wave generation parameter of the rectifier circuit, the driving signals of each switching component in the three-phase matrix switch circuit and the rectifier circuit are respectively generated.

[0211] In specific implementation, when the driving signals of each switching component in the three-phase matrix switch circuit and the rectifier circuit are respectively generated according to the determined duty ratio of each phase driving signal and the wave generation parameter of the rectifier circuit, a single-chip microcomputer, a digital signal processing (DSP) chip or a field programmable gate array (FPGA) chip can be used for implementation, and an existing driving signal generation mode can be used, which is not limited in the embodiment of the present application.

[0212] S305, each switching component is respectively driven by using the generated driving signal of each switching component.

[0213] In specific implementation, after the driving signals of each switching component in the three-phase matrix switch circuit and the rectifier circuit are generated, each switching component can be respectively driven by using the generated driving signal of each switching component, so as to realize the control of the input current, the output voltage, the output current and the soft turn-on of each switching component.

[0214] After introducing the control method of the three-phase single-stage AC-DC converter provided by the embodiment of the present application, the specific implementation process of the control method of the three-phase single-stage AC-DC converter provided by the embodiment of the present application will be described below with reference to FIG. 14.

[0215] As shown in FIG. 14, the specific implementation process of the control method of the three-phase single-stage AC-DC converter provided by the embodiment of the present application includes:

[0216] Step 1401, the phase voltage and the phase current of each phase of the three-phase alternating current, the output voltage and the output current of the rectifier circuit are acquired in real time.

[0217] Step 1402, a voltage sector is calculated to determine the L phase, the M phase, and the S phase, and to determine the correspondence between the three-phase AC and the L phase, the M phase, and the S phase.

[0218] Step 1403, the duty ratio of the target phase driving signal is determined, the target phase being the M phase or the S phase.

[0219] Step 1404, the duty ratio of the another phase driving signal is determined based on the preset duty ratio of the L phase driving signal and the duty ratio of the target phase driving signal.

[0220] Step 1405, the duty ratio of the three-phase AC driving signal is determined based on the correspondence between the three-phase AC and the L phase, the M phase, and the S phase, the duty ratio of the L phase driving signal, the duty ratio of the M phase driving signal, and the duty ratio of the S phase driving signal.

[0221] Step 1406, the output voltage error value is determined based on the output voltage and the pre-configured reference voltage, and the output voltage error value is input into the voltage loop regulator to obtain the output current reference value.

[0222] Step 1407, the output current error value is determined based on the output current and the output current reference value, and the output current error value is input into the current loop regulator to obtain the wave generation parameter of the rectifier circuit.

[0223] Step 1408, the driving signals of the switch components in the three-phase matrix switch circuit and the rectifier circuit are generated according to the duty ratio of the three-phase AC driving signal and the wave generation parameter of the rectifier circuit.

[0224] Step 1409, the corresponding switch components are driven by using the driving signals of the switch components.

[0225] It should be noted that the steps 1402-1405 and the steps 1406-1407 can be processed in sequence, i.e., the steps 1402-1405 are processed first, and then the steps 1406-1407 are processed, or the steps 1406-1407 are processed first, and then the steps 1402-1405 are processed, or the steps 1402-1405 and the steps 1406-1407 are processed in parallel.

[0226] The control method of the three-phase single-stage AC / DC converter provided by the embodiment of the application will be described below by taking a voltage-type converter as an example and referring to FIG. 15.

[0227] As shown in FIG. 15, the control method of the three-phase single-stage AC-DC converter provided by the embodiment of the present application comprises the following steps: at the AC input side, real-time acquisition of phase voltages and phase currents of each phase of the three-phase AC power, calculation of a voltage sector, determination of the corresponding relationship between the three-phase AC power and the L phase, the M phase and the S phase, and determination of VL, VM, VS, IL, IM and IS. The L phase refers to the phase corresponding to the maximum absolute value of the three-phase phase voltage, the S phase refers to the phase corresponding to the minimum absolute value of the three-phase phase voltage, and the M phase refers to the phase whose absolute value of the phase voltage is smaller than that of the L phase and larger than that of the S phase.

[0228] Based on VL, VM and VS, an initial duty ratio value of the M phase driving signal is determined, based on the ratio of the M phase voltage to the L phase voltage, a given duty ratio value is determined, based on the ratio of the M phase current to the L phase current, a feedback duty ratio value is determined, the given duty ratio value is corrected by using the feedback duty ratio value, that is, a target value is obtained by calculating the difference between the given duty ratio value and the feedback duty ratio value, the target value is input into a current loop regulator to obtain a duty ratio adjustment amount of the M phase driving signal, and finally the initial duty ratio value of the M phase driving signal is corrected by using the duty ratio adjustment amount of the M phase driving signal, that is, a duty ratio of the M phase driving signal is obtained by calculating the sum of the initial duty ratio value and the duty ratio adjustment amount.

[0229] After the duty ratio of the M phase driving signal is obtained, the difference between the duty ratio of the preset L phase driving signal and the duty ratio of the M phase driving signal is calculated to obtain the duty ratio of the S phase driving signal. After the duty ratios of the L phase driving signal, the S phase driving signal and the M phase driving signal are obtained, the duty ratios of the three-phase AC power can be determined according to the corresponding relationship between the three-phase AC power and the L phase, the M phase and the S phase.

[0230] At the output side of the rectifier circuit, the output voltage and the output current of the rectifier circuit are acquired in real time, based on the output voltage and a pre-configured reference voltage, an output voltage error value is determined, the output voltage error value is input into a voltage loop regulator to obtain an output current reference value, then based on the output current and the output current reference value, an output current error value is determined, the output current error value is input into a current loop regulator to obtain the firing parameter of the rectifier circuit.

[0231] After the duty ratios of the three-phase AC driving signals and the firing parameters of the rectifier circuit are calculated, the duty ratios of the three-phase AC driving signals and the firing parameters of the rectifier circuit can be input into a PWM generation module to generate the driving signals of each switching component in the three-phase matrix switching circuit and the rectifier circuit, and then the driving signals of each switching component are used to drive the corresponding switching component. The PWM generation module can be a single-chip microcomputer, a DSP chip or an FPGA chip, etc.

[0232] It should be noted that if the converter is a current type converter, as shown in FIG. 16, no voltage loop needs to be set in the output side control loop, and the current loop is given as a pre-configured reference current.

[0233] In one example, when the input voltage satisfies |Ua|>|Ub|>|Uc|, and Ua>0, Ub<0, Uc<0, as shown in FIG. 4, at time period t1, at this time, the A phase is the L phase, the B phase is the M phase, and the C phase is the S phase. The L phase, the M phase, and the S phase have the same frequency of wave generation. Taking the preset L phase duty ratio of 0.5 as an example, the drive signals of each switch assembly obtained by using the control method provided in the embodiment are shown in FIGS. 17 and 18. The drive signals of each switch assembly are described below in combination with FIGS. 17 and 18.

[0234] The switch branch connected with the L phase (A phase) includes switch assemblies Sa1-Sa4. In this case, Sa1 and Sa4 are freewheeling tube drives, and to improve efficiency and reduce unnecessary switching actions, Sa1 and Sa4 are kept open, and Sa2 and Sa3 are rectifier tube drives, and have a duty ratio of 0.5 and complementary conduction, and a dead zone is set.

[0235] It should be noted that by setting the L phase freewheeling tube to be always on, the number of switching times can be reduced, the switching loss can be reduced, and the efficiency of the converter can be improved. By setting the duty ratio of the L phase drive signal to be a fixed constant, the L phase rectifier tube is complementary to the conduction, and no adjustment is needed, so that the control is simpler.

[0236] The switch branch connected with the M phase (B phase) includes switch assemblies Sb1-Sb4. In this case, Sb1 is a rectifier tube drive and is turned on at the same time as Sa3, the duty ratio of the Sb1 drive signal is less than or equal to the duty ratio of the Sa3 drive signal, and Sb1 is switched to the S phase after being turned off; Sb2 is a freewheeling tube drive and is turned on before Sa2 is turned off, so that there is a freewheeling circuit after Sa2 is turned off, ZVS (Zero Voltage Switch) conditions are created for Sa3 and Sb1, Sb2 is turned off before Sb1 is turned off, and MS phase short circuit is avoided when the M phase is switched to the S phase; Sb3 is a freewheeling tube drive and is turned on before Sa3 is turned off, so that there is a freewheeling circuit after Sa3 is turned off, ZVS conditions are created for Sa2 and Sb4, Sb3 is turned off before Sb4 is turned off, and MS phase short circuit is avoided when the M phase is switched to the S phase; and Sb4 is a rectifier tube drive and is turned on at the same time as Sa2, the duty ratio of the Sb4 drive signal is less than or equal to the duty ratio of the Sa2 drive signal, and Sb4 is switched to the S phase after being turned off.

[0237] The switch branch connected with the S phase (C phase) includes switch components Sc1-Sc4. In this case, Sc1 is a rectifier tube driven, and is turned on before Sb1 is turned off after Sb2 is turned off. At this time, the MS phase rectifier tube is in the on state for a period of time, and the MS phase freewheeling tube is in the off state. Because the voltage difference of the LM phase is greater than that of the LS phase, the current flows through the M phase, that is, the LM phase works, and no current flows through the S phase, so Sc1 is a zero current switch (ZCS), and Sc1 is turned off at the same time as Sa3. Sc2 is a freewheeling tube driven, and is turned on after Sb1 is turned off. Because Sc1 has been turned on at this time, the current flows through the S phase after Sb1 is turned off, so Sc2 is ZVS, and Sc2 is turned off when Sa2 is turned on. Sc3 is a freewheeling tube driven, and is turned on after Sb4 is turned off. Because Sc4 has been turned on at this time, the current flows through the S phase after Sb4 is turned off, so Sc3 is ZVS, and Sc3 is turned off when Sa3 is turned on. Sc4 is a rectifier tube driven, and is turned on before Sb4 is turned off after Sb3 is turned off. At this time, the MS phase rectifier tube is in the on state for a period of time, and the MS phase freewheeling tube is in the off state. Because the voltage difference of the LM phase is greater than that of the LS phase, the current flows through the M phase, that is, the LM phase works, and no current flows through the S phase, so Sc4 is ZCS, and Sc4 is turned off at the same time as Sa2.

[0238] It should be noted that, from the driving signals of the switch components, the timing sequence of the M phase freewheeling tube being turned on before the L phase rectifier tube is turned off, the freewheeling loop being provided after the L phase rectifier tube is turned off, the ZVS of the L phase rectifier tube and the M phase rectifier tube, the timing sequence of the M phase freewheeling tube being turned off, the S phase rectifier tube being turned on, the M phase rectifier tube being turned off, and the S phase freewheeling tube being turned on, which ensures that the M phase cutting the S phase will not cause the MS phase short circuit, and simultaneously realizes the ZVZCS of the S phase rectifier tube and the ZVS of the S phase freewheeling tube.

[0239] As shown in FIG. 18, the wave generation of the rectifier circuit is according to the switch components of the switch branch corresponding to the L phase. When Sa2 is turned on, Sr1 and Sr4 are turned on at the same time. When Sa3 is turned on, Sr2 and Sr3 are turned on at the same time.

[0240] In the embodiment of the application, the switch components in the switch branches connected with the A phase, the B phase and the C phase of the three-phase alternating current can all realize soft turn-on. The A phase rectifier switch component is ZVS, the A phase freewheeling switch component is zero-voltage and zero-current switching (ZVZCS), the B phase rectifier switch component is ZVS, the B phase freewheeling switch component is ZVZCS, the C phase rectifier switch component is ZCS, and the C phase freewheeling switch component is ZVS.

[0241] The soft turn-on of the A phase, the B phase and the C phase switch components will be analyzed respectively in combination with FIGS. 19-21.

[0242] As shown in Fig. 19, from the voltage waveform, current waveform and switching action of the switching assembly of the upper bridge arm of phase A in a part of time period, it can be seen that the voltage is 0 when the rectifier switching assembly of phase A is closed, so the rectifier switching assembly is ZVS, and the voltage and current are both 0 when the freewheeling switching assembly of phase A is closed, so the freewheeling switching assembly is ZVZCS; as shown in Fig. 20, from the voltage waveform, current waveform and switching action of the switching assembly of the upper bridge arm of phase B in a part of time period, it can be seen that the voltage is 0 when the rectifier switching assembly of phase B is closed, so the rectifier switching assembly is ZVS, and the voltage and current are both 0 when the freewheeling switching assembly of phase B is closed, so the freewheeling switching assembly is ZVZCS; as shown in Fig. 21, from the voltage waveform, current waveform and switching action of the switching assembly of the upper bridge arm of phase C in a part of time period, it can be seen that the current is 0 when the rectifier switching assembly of phase C is closed, so the rectifier switching assembly is ZCS, and the voltage is 0 when the freewheeling switching assembly of phase C is closed, so the freewheeling switching assembly is ZVS.

[0243] In another example, it is assumed that the rated three-phase alternating current input voltage is 380V, 50 Hertz (HZ), the rated output voltage is 270V, and the rated output power is 50KW. After the control method provided by the embodiment of the present application is adopted, the steady-state waveform of the AC / DC converter is shown in Fig. 22, the three-phase input current is stable, the distortion is small, the phase tracks the input voltage phase, the output current and voltage are stable, and the output voltage ripple is less than 0.5V. The input current is analyzed by Fast Fourier Transform (FFT), and the result is shown in Fig. 23, the THD is 2.05%.

[0244] The test is carried out for the harmonic suppression capability, as shown in Fig. 24, the 7th harmonic of the three-phase input voltage is injected with an amplitude of 3% of the rated input voltage, at this time, as shown in Fig. 25, the input current THD is 3.59%.

[0245] The control method of the three-phase single-stage AC / DC converter provided by the embodiment of the present application is described in detail above in combination with specific examples. The control method provided by the embodiment of the present application, on the one hand, the input parameters of the three-phase alternating current are acquired in real time, then the duty cycles of the phase driving signals are determined based on the acquired input parameters, and the driving signals are generated according to the duty cycles of the phase driving signals, the switching assemblies of the corresponding switching branches are controlled, and the control of the three-phase alternating current input current is realized in this way; on the other hand, the output parameters of the rectifier circuit are acquired, then the wave generation parameters of the rectifier circuit are determined according to the output parameters of the rectifier circuit, and the driving signals are generated according to the wave generation parameters, the corresponding switching assemblies in the rectifier circuit are controlled, and the control of the output voltage and output current is realized in this way.

[0246] By controlling the input current, the output voltage and the output current, the three-phase single-stage AC-DC converter has strong harmonic suppression capability, the THD of the input current is small, and all the switching components can realize soft turn-on, thereby improving the efficiency of the three-phase single-stage AC-DC converter.

[0247] Based on the same concept, the embodiment of the present application also provides a control device of a three-phase single-stage AC-DC converter, the principle of solving the problem of the device is similar to that of the above method, and the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described here.

[0248] As shown in FIG. 26, the embodiment of the present application provides a control device of a three-phase single-stage AC-DC converter, the device comprises:

[0249] The acquisition unit 2601 is configured to acquire the input parameters of the three-phase alternating current and the output parameters of the rectifier circuit in real time.

[0250] The first processing unit 2602 is configured to determine the duty cycles of the phase drive signals based on the input parameters of the three-phase alternating current.

[0251] The second processing unit 2603 is configured to determine the wave generation parameters of the rectifier circuit according to the output parameters of the rectifier circuit.

[0252] The signal generation unit 2604 is configured to generate the drive signals of the switching components in the three-phase matrix switch circuit and the rectifier circuit according to the determined duty cycles of the phase drive signals and the wave generation parameters of the rectifier circuit.

[0253] The drive unit 2605 is configured to drive the corresponding switching components by using the generated drive signals of the switching components.

[0254] In a possible implementation, the first processing unit 2602 is specifically configured to:

[0255] determine the voltage sector of the three-phase alternating current based on the input parameters of the three-phase alternating current;

[0256] determine the correspondence relationship between the three phases of the three-phase alternating current and the L phase, the M phase and the S phase according to the voltage sector of the three-phase alternating current, wherein when the input parameters include the phase voltages of the phases of the three-phase alternating current, the phase voltage of the L phase has the maximum absolute value among the three-phase phase voltages, the phase voltage of the S phase has the minimum absolute value among the three-phase phase voltages, and the absolute value of the phase voltage of the M phase is smaller than that of the L phase and larger than that of the S phase;

[0257] determine the duty cycles of the L phase drive signal, the M phase drive signal and the S phase drive signal respectively according to the input parameters of the three-phase alternating current;

[0258] The duty cycle of each phase of the three-phase alternating current is determined based on the correspondence between the three phases and the L phase, the M phase and the S phase, and the duty cycles of the driving signals of the L phase, the M phase and the S phase.

[0259] In a possible implementation, the first processing unit 2602 is specifically configured to:

[0260] The duty cycle of the target phase driving signal is determined according to the input parameter of the three-phase alternating current, where the target phase is the M phase or the S phase.

[0261] The duty cycle of the another phase driving signal is determined based on the duty cycle of the target phase driving signal and the preset duty cycle of the L phase driving signal.

[0262] In a possible implementation, the input parameter includes the phase voltage of each phase of the three-phase alternating current.

[0263] The first processing unit 2602 is specifically configured to determine the duty cycle of the target phase driving signal based on the phase voltage of each phase.

[0264] In a possible implementation, the input parameter includes the phase voltage and the phase current of each phase of the three-phase alternating current.

[0265] The first processing unit 2602 is specifically configured to:

[0266] The given value of the duty cycle is determined based on the ratio of the target phase voltage to the L phase voltage.

[0267] The feedback value of the duty cycle is determined based on the ratio of the target phase current to the L phase current.

[0268] The given value of the duty cycle is corrected by using the feedback value of the duty cycle to obtain a target value.

[0269] The target value is input into the current loop regulator to obtain the duty cycle of the target phase driving signal.

[0270] In a possible implementation, the input parameter includes the phase voltage and the phase current of each phase of the three-phase alternating current.

[0271] The first processing unit 2602 is specifically configured to:

[0272] The initial value of the duty cycle of the target phase driving signal is determined based on the phase voltage of each phase.

[0273] The given value of the duty cycle is determined based on the ratio of the target phase voltage to the L phase voltage, and the feedback value of the duty cycle is determined based on the ratio of the target phase current to the L phase current. The given value of the duty cycle is corrected by using the feedback value of the duty cycle to obtain a target value. The target value is input into the current loop regulator to obtain the adjustment amount of the duty cycle of the target phase driving signal.

[0274] The duty cycle of the target phase driving signal is corrected by a duty cycle adjustment amount of the target phase driving signal, so as to obtain the duty cycle of the target phase driving signal.

[0275] In a possible implementation, the output parameter comprises an output voltage;

[0276] The second processing unit 2603 is specifically configured to:

[0277] determine an output voltage error value based on the output voltage and a pre-configured reference voltage;

[0278] input the output voltage error value into a voltage loop regulator to obtain a wave-emitting parameter of the rectifier circuit.

[0279] In a possible implementation, the output parameter comprises an output current;

[0280] The second processing unit 2603 is specifically configured to:

[0281] determine an output current error value based on the output current and a pre-configured reference current;

[0282] input the output current error value into a current loop regulator to obtain the wave-emitting parameter of the rectifier circuit.

[0283] In a possible implementation, the output parameter comprises an output voltage and an output current;

[0284] The second processing unit 2603 is specifically configured to:

[0285] determine an output voltage error value based on the output voltage and a pre-configured reference voltage;

[0286] input the output voltage error value into a voltage loop regulator to obtain an output current reference value;

[0287] determine an output current error value based on the output current and the output current reference value;

[0288] input the output current error value into a current loop regulator to obtain the wave-emitting parameter of the rectifier circuit.

[0289] In a possible implementation, the wave-emitting parameter comprises a wave-emitting frequency and a wave-emitting phase shift angle.

[0290] Based on the same concept, the embodiment of the present application further provides another control device of a three-phase single-stage AC / DC converter, and the principle of solving problems of the device is similar to that of the above method, and the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described herein.

[0291] As shown in FIG. 27, the embodiment of the present application provides another control device of a three-phase single-stage AC / DC converter, and the device comprises:

[0292] The sampling module 2701 is configured to acquire input parameters of three-phase alternating current and output parameters of the rectifier circuit in real time.

[0293] The processing module 2702 is configured to determine duty cycles of respective phase driving signals based on the input parameters of the three-phase alternating current, and determine wave generation parameters of the rectifier circuit based on the output parameters of the rectifier circuit.

[0294] The PWM generation module 2703 is configured to generate driving signals of respective switching components in the three-phase matrix switch circuit and the rectifier circuit according to the determined duty cycles of the respective phase driving signals and the wave generation parameters of the rectifier circuit, and drive the respective switching components by using the generated driving signals of the respective switching components.

[0295] Based on the same concept, the embodiments of the present application also provide an electronic device, the principle of which for solving the problem is similar to the principle of the above method for solving the problem, and the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described here.

[0296] As shown in FIG. 28, an electronic device provided by an embodiment of the present application includes a processor 2801 and a memory 2802 for storing executable instructions of the processor 2801, wherein the processor 2801 implements the following steps by running the executable instructions.

[0297] The input parameters of three-phase alternating current and the output parameters of the rectifier circuit are acquired in real time.

[0298] The duty cycles of respective phase driving signals are determined based on the input parameters of the three-phase alternating current.

[0299] The wave generation parameters of the rectifier circuit are determined based on the output parameters of the rectifier circuit.

[0300] The driving signals of respective switching components in the three-phase matrix switch circuit and the rectifier circuit are generated according to the determined duty cycles of the respective phase driving signals and the wave generation parameters of the rectifier circuit.

[0301] The respective switching components are driven by using the generated driving signals of the respective switching components.

[0302] In a possible implementation, the processor 2801 is specifically configured to perform the following steps.

[0303] The voltage sector of the three-phase alternating current is determined based on the input parameters of the three-phase alternating current.

[0304] According to the voltage sector of the three-phase alternating current, a corresponding relationship between the three phases of the three-phase alternating current and the L phase, the M phase and the S phase is determined, wherein, when the input parameters include phase voltages of each phase of the three-phase alternating current, the phase voltage absolute value of the L phase is the largest among the three-phase phase voltages, the phase voltage absolute value of the S phase is the smallest among the three-phase phase voltages, and the phase voltage absolute value of the M phase is smaller than the phase voltage absolute value of the L phase and larger than the phase voltage absolute value of the S phase;

[0305] According to the input parameters of the three-phase alternating current, duty cycles of the L phase, the M phase and the S phase driving signals are determined respectively;

[0306] Based on the corresponding relationship between the three phases of the three-phase alternating current and the L phase, the M phase and the S phase, and the duty cycles of the L phase, the M phase and the S phase driving signals, duty cycles of each phase driving signal of the three-phase alternating current are determined.

[0307] In a possible implementation, the processor 2801 is specifically configured to perform:

[0308] According to the input parameters of the three-phase alternating current, a duty cycle of a target phase driving signal is determined, wherein the target phase is the M phase or the S phase;

[0309] Based on the duty cycle of the target phase driving signal and a preset duty cycle of the L phase driving signal, a duty cycle of another phase driving signal is determined.

[0310] In a possible implementation, the input parameters include phase voltages of each phase of the three-phase alternating current;

[0311] The processor 2801 is specifically configured to perform: based on the phase voltages of each phase, a duty cycle of a target phase driving signal is determined.

[0312] In a possible implementation, the input parameters include phase voltages and phase currents of each phase of the three-phase alternating current;

[0313] The processor 2801 is specifically configured to perform:

[0314] Based on a ratio of the target phase voltage to the L phase voltage, a duty cycle given value is determined;

[0315] Based on a ratio of the target phase current to the L phase current, a duty cycle feedback value is determined;

[0316] The duty cycle feedback value is used to correct the duty cycle given value to obtain a target value;

[0317] The target value is input into a current loop regulator to obtain the duty cycle of the target phase driving signal.

[0318] In a possible implementation, the input parameters include phase voltages and phase currents of each phase of the three-phase alternating current;

[0319] The processor 2801 is specifically configured to perform:

[0320] determine an initial value of a duty ratio of the target phase driving signal based on the phase voltage of the target phase;

[0321] determine a given value of the duty ratio based on a ratio of the target phase voltage to the L-phase voltage, and determine a feedback value of the duty ratio based on a ratio of the target phase current to the L-phase current; correct the given value of the duty ratio by using the feedback value of the duty ratio to obtain a target value, and input the target value into a current loop regulator to obtain a duty ratio adjustment amount of the target phase driving signal;

[0322] correct the initial value of the duty ratio of the target phase driving signal by using the duty ratio adjustment amount of the target phase driving signal to obtain the duty ratio of the target phase driving signal.

[0323] In a possible implementation, the output parameter includes an output voltage.

[0324] The processor 2801 is specifically configured to perform:

[0325] determine an output voltage error value based on the output voltage and a pre-configured reference voltage;

[0326] input the output voltage error value into a voltage loop regulator to obtain a firing parameter of the rectifier circuit.

[0327] In a possible implementation, the output parameter includes an output current.

[0328] The processor 2801 is specifically configured to perform:

[0329] determine an output current error value based on the output current and a pre-configured reference current;

[0330] input the output current error value into a current loop regulator to obtain a firing parameter of the rectifier circuit.

[0331] In a possible implementation, the output parameter includes an output voltage and an output current.

[0332] The processor 2801 is specifically configured to perform:

[0333] determine an output voltage error value based on the output voltage and a pre-configured reference voltage;

[0334] input the output voltage error value into a voltage loop regulator to obtain an output current reference value;

[0335] determine an output current error value based on the output current and the output current reference value;

[0336] input the output current error value into a current loop regulator to obtain a firing parameter of the rectifier circuit.

[0337] In a possible implementation, the wave launching parameters include a wave launching frequency and a wave launching phase shift angle.

[0338] Based on the same inventive concept, the embodiments of the present disclosure provide a computer storage medium, which includes computer program codes, and when the computer program codes are run on a computer, the computer is caused to execute the control method of the three-phase single-stage AC / DC converter as any one of the preceding embodiments. Since the principle of the computer storage medium to solve the problem is similar to the control method of the three-phase single-stage AC / DC converter, the implementation of the computer storage medium can be referred to the implementation of the method, and the repeated parts will not be described herein.

[0339] In the implementation process, the computer storage medium can include a universal serial bus flash drive (USB), a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various storage media that can store program codes.

[0340] Based on the same inventive concept, the embodiments of the present disclosure also provide a computer program product, which includes computer program codes, and when the computer program codes are run on a computer, the computer is caused to execute the control method of the three-phase single-stage AC / DC converter as any one of the preceding embodiments. Since the principle of the computer program product to solve the problem is similar to the control method of the three-phase single-stage AC / DC converter, the implementation of the computer program product can be referred to the implementation of the method, and the repeated parts will not be described herein.

[0341] The computer program product can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium may, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination of the above. More specific examples (non-exhaustive list) of the readable storage medium include an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0342] Those skilled in the art will appreciate that embodiments of the present application can be devised for a variety of other systems which are currently developed or later developed. Those skilled in the art will appreciate that the embodiments of the present application can provide as methods, systems or computer program products. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, and so on) embodying computer-readable program code.

[0343] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processing device or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams block or blocks.

[0344] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart illustrations and / or block diagrams block or blocks.

[0345] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart illustrations and / or block diagrams block or blocks.

[0346] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A three-phase single-stage AC-DC converter, characterized by comprising: The converter comprises: a three-phase matrix switch circuit, a resonance circuit, an isolation circuit, and a rectifier circuit, wherein the three-phase matrix switch circuit is connected to a three-phase alternating current and comprises three independently arranged switch branches, each switch branch comprising an upper bridge arm and a lower bridge arm, and the midpoint of the upper bridge arm and the lower bridge arm in each switch branch is connected to a phase of the alternating current, and each bridge arm comprises a bidirectional switch component or two switch components connected in reverse series; the resonance circuit comprises a resonance capacitor, a resonance inductor, and an excitation inductor connected in series, and is connected between the common terminal of the upper bridge arms and the common terminal of the lower bridge arms of the three switch branches; the isolation circuit is connected to the resonance circuit on one side and connected to the rectifier circuit on the other side; the rectifier circuit comprises at least two switch components, and the input side is connected to the isolation circuit, and the output side is connected to a load device.

2. The transformer of claim 1, wherein, The converter further comprises a three-phase filter circuit connected between the three-phase alternating current and the three-phase matrix switch circuit, and the three-phase filter circuit comprises three filter branches, each filter branch being connected to a phase of the alternating current.

3. The inverter according to claim 1 or 2, characterized by The converter further comprises a filter capacitor connected between the rectifier circuit and the load device, and used for filtering the output of the rectifier circuit.

4. The transformer of claim 1, wherein, The rectifier circuit comprises a full-bridge rectifier circuit and a half-bridge rectifier circuit.

5. The transformer of claim 1, wherein, The isolation circuit comprises a transformer, the primary side of the transformer is connected in parallel with the excitation inductor, and the secondary side of the transformer is connected to the rectifier circuit.

6. A control method applied to the three-phase single-stage AC / DC converter according to any one of claims 1 to 5, characterized in that, The method comprises: real-time acquisition of input parameters of a three-phase alternating current and output parameters of a rectifier circuit; determination of duty ratios of phase drive signals based on the input parameters of the three-phase alternating current; determination of wave generation parameters of the rectifier circuit according to the output parameters of the rectifier circuit; generation of drive signals of each switch component in the three-phase matrix switch circuit and the rectifier circuit according to the determined duty ratios of the phase drive signals and the wave generation parameters of the rectifier circuit; driving of the corresponding switch components by using the generated drive signals of each switch component.

7. The method of claim 6, wherein, The determination of the duty ratios of the phase drive signals based on the input parameters of the three-phase alternating current comprises: determination of a voltage sector of the three-phase alternating current based on the input parameters of the three-phase alternating current; determination of a corresponding relationship between the three phases of the three-phase alternating current and L phase, M phase, and S phase according to the voltage sector of the three-phase alternating current, wherein, when the input parameters comprise phase voltages of each phase of the three-phase alternating current, the absolute value of the phase voltage of the L phase is the largest among the three-phase phase voltages, the absolute value of the phase voltage of the S phase is the smallest among the three-phase phase voltages, and the absolute value of the phase voltage of the M phase is smaller than the absolute value of the phase voltage of the L phase and larger than the absolute value of the phase voltage of the S phase; determination of duty ratios of L phase, M phase, and S phase drive signals according to the input parameters of the three-phase alternating current; determination of duty ratios of each phase drive signal of the three-phase alternating current based on the corresponding relationship between the three phases of the three-phase alternating current and L phase, M phase, and S phase, and the duty ratios of the L phase, M phase, and S phase drive signals.

8. The method of claim 7, wherein, The determination of the duty ratios of the L phase, M phase, and S phase drive signals according to the input parameters of the three-phase alternating current comprises: According to the input parameter of the three-phase alternating current, a duty cycle of a target phase driving signal is determined, wherein the target phase is M phase or S phase; According to the duty cycle of the target phase driving signal and a preset duty cycle of L phase driving signal, a duty cycle of another phase driving signal is determined.

9. The method of claim 8, wherein, The input parameter includes phase voltage of each phase of the three-phase alternating current; The duty cycle of the target phase driving signal is determined according to the phase voltage of each phase.

10. The method of claim 8, wherein, The input parameter includes phase voltage and phase current of each phase of the three-phase alternating current; The duty cycle of the target phase driving signal is determined according to the input parameter of the three-phase alternating current, including: A given value of the duty cycle is determined according to a ratio of target phase voltage to L phase voltage; A feedback value of the duty cycle is determined according to a ratio of target phase current to L phase current; The given value of the duty cycle is corrected by using the feedback value of the duty cycle to obtain a target value; The target value is input into a current loop regulator to obtain the duty cycle of the target phase driving signal.

11. The method of claim 8, wherein, The input parameter includes phase voltage and phase current of each phase of the three-phase alternating current; The duty cycle of the target phase driving signal is determined according to the input parameter of the three-phase alternating current, including: An initial value of the duty cycle of the target phase driving signal is determined according to the phase voltage of each phase; A given value of the duty cycle is determined according to a ratio of target phase voltage to L phase voltage, and a feedback value of the duty cycle is determined according to a ratio of target phase current to L phase current; the given value of the duty cycle is corrected by using the feedback value of the duty cycle to obtain a target value; the target value is input into a current loop regulator to obtain a duty cycle adjustment amount of the target phase driving signal; The initial value of the duty cycle of the target phase driving signal is corrected by using the duty cycle adjustment amount of the target phase driving signal to obtain the duty cycle of the target phase driving signal.

12. The method of claim 6, wherein, The output parameter includes output voltage; The wave generation parameter of the rectifier circuit is determined according to the output parameter of the rectifier circuit, including: An output voltage error value is determined according to the output voltage and a pre-configured reference voltage; The output voltage error value is input into a voltage loop regulator to obtain the wave generation parameter of the rectifier circuit.

13. The method of claim 6, wherein, The output parameter includes output current; The wave generation parameter of the rectifier circuit is determined according to the output parameter of the rectifier circuit, including: An output current error value is determined according to the output current and a pre-configured reference current; The output current error value is input into a current loop regulator to obtain the wave generation parameter of the rectifier circuit.

14. The method of claim 6, wherein, The output parameter includes output voltage and output current; The wave generation parameter of the rectifier circuit is determined according to the output parameter of the rectifier circuit, including: An output voltage error value is determined according to the output voltage and a pre-configured reference voltage; The output voltage error value is input into a voltage loop regulator to obtain an output current reference value; An output current error value is determined according to the output current and the output current reference value; The output current error value is input into a current loop regulator to obtain the wave generation parameter of the rectifier circuit.

15. The method according to any one of claims 6-14, characterized in that, The wave emitting parameters include a wave emitting frequency and a wave emitting phase shift angle.

16. A control device for the three-phase single-stage AC / DC converter according to any one of claims 1 to 5, characterized by The device comprises: An acquisition unit configured to acquire input parameters of three-phase alternating current and output parameters of a rectifier circuit in real time; A first processing unit configured to determine duty cycles of phase driving signals respectively based on the input parameters of the three-phase alternating current; A second processing unit configured to determine wave emitting parameters of the rectifier circuit according to the output parameters of the rectifier circuit; A signal generation unit configured to generate driving signals of each switching component in the three-phase matrix switch circuit and the rectifier circuit respectively according to the determined duty cycles of the phase driving signals and the wave emitting parameters of the rectifier circuit; A driving unit configured to drive corresponding switching components respectively by using the generated driving signals of each switching component.

17. A control device for the three-phase single-stage AC / DC converter according to any one of claims 1 to 5, characterized by The device comprises: A sampling module configured to acquire input parameters of three-phase alternating current and output parameters of a rectifier circuit in real time; A processing module configured to determine duty cycles of phase driving signals respectively based on the input parameters of the three-phase alternating current, and to determine wave emitting parameters of the rectifier circuit according to the output parameters of the rectifier circuit; A pulse width modulation (PWM) generation module configured to generate driving signals of each switching component in the three-phase matrix switch circuit and the rectifier circuit respectively according to the determined duty cycles of the phase driving signals and the wave emitting parameters of the rectifier circuit, and to drive corresponding switching components respectively by using the generated driving signals of each switching component.

18. An electronic device, comprising: It comprises: A processor; A memory for storing processor-executable instructions; wherein the processor implements the steps of the method of any one of claims 6-15 by running the executable instructions.

19. A computer storage medium having stored thereon a computer program, characterized in that The program is executed by the processor to implement the steps of the method of any one of claims 6-15.

20. A computer program product, characterised in that, The computer program product comprises a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer device, cause the computer device to perform the steps of the method of any one of claims 6-15.

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