Rectifier topology circuit and system

Abstract

The invention provides a rectifier topology circuit and system, the circuit comprises a current generation module, a rectification module, a voltage division module, a voltage input module and a driving circuit, the circuit comprises a first diode, a second diode, a third diode, a fourth diode, a first switch tube, a second switch tube and a third switch tube, and the first diode is electrically connected with the current input module and the voltage division module; the second diode is electrically connected with the voltage dividing module and the current input module; the third diode is electrically connected with the first switch tube and the first diode; the fourth diode is electrically connected with the first diode and the first switch tube; the driving circuit controls the first, second and third switching tubes to be switched on or off; the second switch tube is electrically connected with the first switch tube and the voltage dividing module; the third switch tube is electrically connected with the first switch tube and the voltage dividing module; the voltage input module is electrically connected with the first diode and the second diode and inputs voltage. According to the rectifier topology circuit and system provided by the invention, the number of used diodes can be reduced, and conduction and reverse return loss can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of power electronics, and in particular to a rectifier topology circuit and system. Background Art

[0002] In medium- and low-voltage, high-power applications, multilevel rectifiers offer higher output voltage, lower current harmonic distortion, more balanced loss distribution, and reduced switch stress compared to two-level rectifiers. Among these multilevel rectifiers, three-level source-clamped converters, three-level T-type converters, and five-level active-clamped converters are widely used in industrial applications such as wind power generation and uninterruptible power supplies. Compared to three-level rectifiers, four-level rectifiers have switches that can withstand less voltage stress. Compared to five-level rectifiers, four-level rectifiers require fewer switches and are less difficult to control capacitor voltage balance. This makes four-level rectifiers a good compromise between device cost and control difficulty. Existing four-level rectifier topologies are primarily clamped, including the following: Four-level midpoint-clamped rectifiers and four-level boost rectifiers are the most basic four-level rectifiers, but these require six switches and six diodes per phase. Two related prior art designs propose nine-switch four-level rectifiers, each using only three switches per phase. However, these topologies further increase the number of diodes required, requiring six or eight diodes per phase. A six-switch rectifier further reduces the number of switches, but requires up to ten diodes per phase.

[0003] While existing four-level rectifiers can reduce the number of switches used per phase, they fail to effectively control the number of diodes used per phase, and may even increase them. The inclusion of a large number of diodes increases conduction losses and reverse recovery losses, reducing the conversion efficiency of the four-level rectifier. Furthermore, the inclusion of a large number of components increases costs. Summary of the Invention

[0004] The present invention aims to provide a rectifier topology circuit and system to solve the above technical problems, avoid increasing the number of diodes used in each phase, and effectively reduce conduction loss and reverse recovery loss, thereby improving the conversion efficiency of the rectifier and reducing costs.

[0005] In order to solve the above technical problems, the present invention provides a rectifier topology circuit, including an AC current output module, a rectifier switch module, a capacitor voltage divider module, a DC voltage output module and an external drive circuit, wherein the rectifier switch module includes a first diode, a second diode, a third diode, a fourth diode, a first switch tube, a second switch tube and a third switch tube, wherein:

[0006] The output end of the AC current output module is electrically connected to the anode of the first diode;

[0007] The cathode of the first diode is electrically connected to the first input terminal of the capacitor voltage divider module;

[0008] The anode of the second diode is electrically connected to the fourth input terminal of the capacitor voltage divider module, and the cathode of the second diode is electrically connected to the anode of the first diode;

[0009] The anode of the third diode is electrically connected to the source of the first switch tube, and the cathode of the third diode is electrically connected to the anode of the first diode;

[0010] The anode of the fourth diode is electrically connected to the anode of the first diode, and the cathode of the fourth diode is electrically connected to the drain of the first switching tube;

[0011] The external driving circuit controls the gates of the first switching tube, the second switching tube, and the third switching tube through a driving signal to turn on or off the first switching tube, the second switching tube, and the third switching tube;

[0012] The source electrode of the second switch tube is electrically connected to the source electrode of the first switch tube, and the drain electrode of the second switch tube is electrically connected to the second input terminal of the capacitor voltage divider module;

[0013] The drain of the third switch tube is electrically connected to the drain of the first switch tube, and the source of the third switch tube is electrically connected to the third input terminal of the capacitor voltage divider module;

[0014] The positive output terminal of the DC voltage output module is electrically connected to the cathode of the first diode, and the negative output terminal of the DC voltage output module is electrically connected to the anode of the second diode.

[0015] In the above scheme, when the switch tube state is different, the current flow direction in the circuit is also different:

[0016] The DC voltage output module outputs DC voltage U dc ;

[0017] In the first case, the external drive circuit controls the first and third switch tubes to be cut off and the second switch tube to be turned on through the drive signal; when the AC current output module outputs forward current, the AC current flows through the first diode, the capacitor voltage divider module and the second switch tube, and the output voltage is 1 / 2U dc ;

[0018] In the second case, the external drive circuit controls the third switch tube to be cut off through the drive signal, and the first switch tube and the second switch tube to be turned on; when the AC current output module outputs a forward current, the AC current flows through the fourth diode, the first switch tube, the second switch tube and the capacitor voltage divider module, and the output voltage is 1 / 6U dc ;

[0019] In the third case, the external drive circuit controls the third switch tube to be cut off through the drive signal, and the first switch tube and the second switch tube are turned on; when the AC current output module outputs reverse current, the AC current flows through the capacitor voltage divider module, the second switch tube and the third diode, and the output voltage is 1 / 6U dc ;

[0020] In the fourth case, the external drive circuit controls the second switch tube to be cut off through the drive signal, and the first and third switch tubes to be turned on; when the AC current output module outputs forward current, the AC current flows through the fourth diode, the third switch tube and the capacitor voltage divider module, and the output voltage is -1 / 6U dc ;

[0021] In the fifth case, the external drive circuit controls the second switch tube to be turned off through the drive signal, and the first and third switch tubes are turned on; when the AC current output module outputs reverse current, the AC current flows through the capacitor voltage divider module, the third switch tube, the first switch tube and the third diode, and the output voltage is -1 / 6U dc ;

[0022] In the sixth case, the external drive circuit controls the first and second switch tubes to be cut off and the third switch tube to be turned on through the drive signal; when the AC current output module outputs a forward current, the AC current flows through the capacitor voltage divider module, the third switch tube and the second diode, and the output voltage is -1 / 2U dc .

[0023] By converting AC current into DC current through a rectifier switch module, the form of electrical energy can be transformed. By controlling the on and off state of the switch tube through a drive signal, the current flow is accurately directed, preventing unreasonable circulating current or surge current in the device, reducing additional losses caused by abnormal current flow, and improving the accuracy and efficiency of power conversion. Compared to existing technologies, the above-mentioned rectifier switch module not only reduces the number of diodes used and reduces costs, but also effectively reduces conduction loss and reverse recovery loss, thereby improving the conversion efficiency of the rectifier.

[0024] Furthermore, the AC current output module includes a first AC power supply and a first inductor, wherein:

[0025] One end of the first AC power supply is electrically connected to the AC measuring terminal, and the other end is electrically connected to one end of the first inductor;

[0026] The other end of the first inductor is electrically connected to the anode of the first diode.

[0027] In the above solution, the first AC power source is electrically connected to the AC measuring terminals, allowing AC current to be fed into the rectifier switch module, providing input for subsequent rectification and voltage division steps. The use of the first inductor provides power factor correction for the circuit. When AC current passes through the first inductor, it hinders current changes, reducing the phase difference between current and voltage, improving the circuit's power factor, reducing reactive power loss, and increasing energy efficiency.

[0028] Furthermore, the capacitive voltage divider module includes a first capacitor, a second capacitor and a third capacitor, specifically:

[0029] One end of the first capacitor serves as a first input end of the capacitor voltage divider module, and the other end serves as a second input end of the capacitor voltage divider module;

[0030] One end of the second capacitor is electrically connected to one end of the first capacitor, and the other end serves as the third input end of the capacitor voltage divider module;

[0031] One end of the third capacitor is electrically connected to one end of the second capacitor, and the other end serves as the fourth input end of the capacitor voltage divider module.

[0032] In this solution, three capacitors connected in series divide the DC voltage into three equal voltages. These capacitors work in conjunction with the rectifier switch module, controlling the on and off switching of the three switches via a drive signal, directing current through different capacitors to generate a variety of output levels.

[0033] Furthermore, it also includes a load module, specifically:

[0034] The load module includes a first resistor, one end of the first resistor is electrically connected to the first input end of the capacitor voltage divider module, and the other end of the first resistor is electrically connected to the fourth input end of the capacitor voltage divider module.

[0035] In the above solution, after the rectifier switch module converts AC power into DC power, the current passes through the first resistor, where the electrical energy is dissipated in the form of heat, achieving the conversion from electrical energy to other forms of energy. The first resistor also stabilizes the circuit state. During circuit startup and shutdown, or when the input voltage or current fluctuates, the first resistor dissipates excess energy, preventing abnormal conditions such as overvoltage and overcurrent in the circuit, protecting other circuit components in each phase from damage, and preventing excessive current from impacting the diodes and switches in the rectifier switch module.

[0036] The present invention provides a three-phase rectifier topology system, including an AC current output subsystem, an A-phase circuit subsystem, a B-phase circuit subsystem, a C-phase circuit subsystem, a capacitor voltage divider module, a DC voltage output module, and an external drive circuit, wherein:

[0037] The A-phase circuit subsystem includes an A-phase rectifier switch module, specifically:

[0038] The A-phase rectifier switch module includes an A-phase first diode, an A-phase second diode, an A-phase third diode, an A-phase fourth diode, an A-phase first switch tube, an A-phase second switch tube, and an A-phase third switch tube, wherein:

[0039] The first output terminal of the AC current output subsystem is electrically connected to the anode of the first diode of phase A;

[0040] The cathode of the first diode of phase A is electrically connected to the first input end of the capacitor voltage divider module;

[0041] The anode of the second diode of phase A is electrically connected to the fourth input terminal of the capacitor voltage divider module, and the cathode of the second diode of phase A is electrically connected to the anode of the first diode of phase A;

[0042] The anode of the third diode of phase A is electrically connected to the source of the first switching tube of phase A, and the cathode of the third diode of phase A is electrically connected to the anode of the first diode of phase A;

[0043] The anode of the fourth diode of phase A is electrically connected to the anode of the first diode of phase A, and the cathode of the fourth diode of phase A is electrically connected to the drain of the first switching tube of phase A;

[0044] The external drive circuit of phase A controls the gates of the first switching tube of phase A, the second switching tube of phase A, and the third switching tube of phase A through a drive signal to turn on or off the first switching tube of phase A, the second switching tube of phase A, and the third switching tube of phase A;

[0045] The source electrode of the second switching tube of phase A is electrically connected to the source electrode of the first switching tube, and the drain electrode of the second switching tube of phase A is electrically connected to the second input end of the capacitor voltage divider module;

[0046] The drain of the third switching tube of phase A is electrically connected to the drain of the first switching tube of phase A, and the source of the third switching tube of phase A is electrically connected to the third input terminal of the capacitor voltage divider module;

[0047] The positive output terminal of the DC voltage output module is electrically connected to the cathode of the first diode of phase A, and the negative output terminal of the DC voltage output module is electrically connected to the anode of the second diode of phase A;

[0048] The B-phase circuit subsystem includes a B-phase rectifier switch module, specifically:

[0049] The B-phase rectifier switch module includes a B-phase first diode, a B-phase second diode, a B-phase third diode, a B-phase fourth diode, a B-phase first switch tube, a B-phase second switch tube and a B-phase third switch tube, wherein:

[0050] The second output terminal of the AC current output subsystem is electrically connected to the anode of the first diode of phase B;

[0051] The cathode of the first diode of phase B is electrically connected to the first input end of the capacitor voltage divider module;

[0052] The anode of the second diode of phase B is electrically connected to the fourth input terminal of the capacitor voltage divider module, and the cathode of the second diode of phase B is electrically connected to the anode of the first diode of phase B;

[0053] The anode of the third diode of phase B is electrically connected to the source of the first switching tube of phase B, and the cathode of the third diode of phase B is electrically connected to the anode of the first diode of phase B;

[0054] The anode of the fourth diode of phase B is electrically connected to the anode of the first diode of phase B, and the cathode of the fourth diode of phase B is electrically connected to the drain of the first switching tube of phase B;

[0055] The B-phase external drive circuit controls the gates of the first, second, and third switching tubes of the B-phase through a drive signal to turn on or off the first, second, and third switching tubes of the B-phase.

[0056] The source electrode of the second switching tube of phase B is electrically connected to the source electrode of the first switching tube, and the drain electrode of the second switching tube of phase B is electrically connected to the second input end of the capacitor voltage divider module;

[0057] The drain of the third switching tube of phase B is electrically connected to the drain of the first switching tube of phase B, and the source of the third switching tube of phase B is electrically connected to the third input terminal of the capacitor voltage divider module;

[0058] The positive output terminal of the DC voltage output module is electrically connected to the cathode of the first diode of phase B, and the negative output terminal of the DC voltage output module is electrically connected to the anode of the second diode of phase B;

[0059] The C-phase circuit subsystem includes a C-phase rectifier switch module, specifically:

[0060] The C-phase rectifier switch module includes a C-phase first diode, a C-phase second diode, a C-phase third diode, a C-phase fourth diode, a C-phase first switch tube, a C-phase second switch tube and a C-phase third switch tube, wherein:

[0061] The third output terminal of the AC current output subsystem is electrically connected to the anode of the first diode of phase C;

[0062] The cathode of the first diode of phase C is electrically connected to the first input end of the capacitor voltage divider module;

[0063] The anode of the second diode of phase C is electrically connected to the fourth input terminal of the capacitor voltage divider module, and the cathode of the second diode of phase C is electrically connected to the anode of the first diode of phase C;

[0064] The anode of the third diode of phase C is electrically connected to the source of the first switching tube of phase C, and the cathode of the third diode of phase C is electrically connected to the anode of the first diode of phase C;

[0065] The anode of the fourth diode of phase C is electrically connected to the anode of the first diode of phase C, and the cathode of the fourth diode of phase C is electrically connected to the drain of the first switching tube of phase C;

[0066] The C-phase external drive circuit controls the gates of the first, second, and third switching tubes of the C-phase through a drive signal to turn on or off the first, second, and third switching tubes of the C-phase;

[0067] The source electrode of the second switching tube of phase C is electrically connected to the source electrode of the first switching tube, and the drain electrode of the second switching tube of phase C is electrically connected to the second input end of the capacitor voltage divider module;

[0068] The drain of the third switching tube of phase C is electrically connected to the drain of the first switching tube of phase C, and the source of the third switching tube of phase C is electrically connected to the third input terminal of the capacitor voltage divider module;

[0069] The positive output terminal of the DC voltage output module is electrically connected to the cathode of the first diode of phase C, and the negative output terminal of the DC voltage output module is electrically connected to the anode of the second diode of phase C.

[0070] The three-phase rectifier topology system provided by the above scheme has a simple structure. In actual application, it only needs to use the A-phase rectifier switch module, the B-phase rectifier switch module and the C-phase rectifier switch module to synchronously rectify the three-phase AC current into DC current, so as to realize the conversion of the form of electric energy. By controlling the conduction and cutoff of the switch tube through the driving signal, the current flow is accurately guided, which can avoid the unreasonable circulation or impact current in the device, reduce the additional loss caused by the abnormal flow of current, and improve the accuracy and efficiency of electric energy conversion. Compared with the existing technology, the above-mentioned rectifier switch module not only reduces the number of diodes used in each phase and reduces costs, but also effectively reduces the conduction loss and reverse recovery loss, thereby improving the conversion efficiency of the three-phase rectifier topology system.

[0071] Furthermore, the AC current output subsystem, wherein the AC current output subsystem includes an A-phase AC current output module, a B-phase AC current output module and a C-phase AC current output module, is specifically:

[0072] The A-phase AC current output module includes an A-phase first AC power supply and an A-phase first inductor, wherein:

[0073] One end of the A-phase first AC power supply is electrically connected to the AC measuring terminal, and the other end is electrically connected to one end of the A-phase first inductor;

[0074] The other end of the first inductor of phase A serves as the first output end of the AC current output subsystem;

[0075] The B-phase AC current output module includes a B-phase first AC power supply and a B-phase first inductor, wherein:

[0076] One end of the B-phase first AC power supply is electrically connected to the AC measuring terminal, and the other end is electrically connected to one end of the B-phase first inductor;

[0077] The other end of the first inductor of phase B serves as the second output end of the AC current output subsystem;

[0078] The C-phase AC current output module includes a C-phase first AC power supply and a C-phase first inductor, wherein:

[0079] One end of the C-phase first AC power supply is electrically connected to the AC measuring terminal, and the other end is electrically connected to one end of the C-phase first inductor;

[0080] The other end of the first inductor of phase C serves as the third output end of the AC current output subsystem.

[0081] In the above scheme, the first AC power supply of each phase is electrically connected to the AC measuring terminal, so that the AC current of each phase can be connected to the rectifier switch module of each phase, providing input for the subsequent rectification and voltage division links. The use of the first inductor can play a role in power factor correction of the circuit, and when the AC current of each phase passes through the first inductor of each phase, it will hinder the change of current, reduce the phase difference between current and voltage, improve the power factor of the circuit, reduce reactive power loss, and improve the efficiency of electric energy utilization. In this way, the separate transmission and distribution of three-phase AC current is realized, so that each phase circuit subsystem can independently rectify and process the AC current, and finally realize the coordinated work of the three phases, thereby improving the power transmission capacity and efficiency of the entire system.

[0082] Furthermore, the capacitive voltage divider module includes a first capacitor, a second capacitor and a third capacitor, specifically:

[0083] One end of the first capacitor serves as a first input end of the capacitor voltage divider module, and the other end serves as a second input end of the capacitor voltage divider module;

[0084] One end of the second capacitor is electrically connected to one end of the first capacitor, and the other end serves as the third input end of the capacitor voltage divider module;

[0085] One end of the third capacitor is electrically connected to one end of the second capacitor, and the other end serves as the fourth input end of the capacitor voltage divider module.

[0086] In this solution, three capacitors connected in series divide the DC voltage into three equal voltages. These capacitors work in conjunction with the rectifier switch modules in each phase. Drive signals from each phase control the on / off switching transistors in each phase, directing current through different capacitors to generate a variety of output levels.

[0087] Furthermore, it also includes a load module, specifically:

[0088] The load module includes a first resistor, one end of the first resistor is electrically connected to the first input end of the capacitor voltage divider module, and the other end of the first resistor is electrically connected to the fourth input end of the capacitor voltage divider module.

[0089] In the above solution, after the rectifier switch module converts AC power into DC power, the current passes through the first resistor, where the electrical energy is dissipated in the form of heat, achieving the conversion from electrical energy to other forms of energy. The first resistor also stabilizes the circuit state. During circuit startup and shutdown, or when the input voltage or current fluctuates, the first resistor dissipates excess energy, preventing abnormal conditions such as overvoltage and overcurrent in the circuit, protecting other circuit components in each phase from damage, and preventing excessive current from impacting the diodes and switches in the rectifier switch module.

[0090] The present invention provides a control method for a three-phase rectifier topology system, which is applied to the three-phase rectifier topology system as described above. The control method comprises the following steps:

[0091] Outputting AC current based on the AC current output subsystem;

[0092] Based on a drive signal from an external drive circuit, the gate of the first switching tube of phase A, the gate of the second switching tube of phase A, the gate of the third switching tube of phase A, the gate of the first switching tube of phase B, the gate of the second switching tube of phase B, the gate of the third switching tube of phase B, the gate of the first switching tube of phase C, the gate of the second switching tube of phase C, and the gate of the third switching tube of phase C are controlled to cause the circuit subsystem of phase A, the circuit subsystem of phase B, and the circuit subsystem of phase C to rectify the AC current and convert the AC current into DC current;

[0093] Provides DC voltage based on DC voltage output module;

[0094] The DC voltage is divided based on the capacitor voltage divider module to achieve multi-level output.

[0095] The control method for a three-phase rectifier topology system provided by the above scheme is simple. In practical applications, it is only necessary to convert the input three-phase AC current into DC current by controlling the switch tubes in the A-phase circuit subsystem, the B-phase circuit subsystem, and the C-phase circuit subsystem. The capacitor voltage divider module used divides the voltage of the DC voltage output module into multiple levels to achieve multi-level output. In addition, the gates of the switch tubes in the three phases A, B, and C are controlled separately by an external drive circuit to accurately guide the current flow and achieve independent rectification of each phase. It can also avoid the generation of unreasonable circulating current or inrush current in the device, reduce the additional loss caused by abnormal current flow, and improve the accuracy and efficiency of power conversion. The above control method also effectively reduces conduction loss and reverse recovery loss, thereby improving the conversion efficiency of the three-phase rectifier topology system.

[0096] Furthermore, the drive signal based on the external drive circuit controls the gate of the first switching tube of phase A, the gate of the second switching tube of phase A, the gate of the third switching tube of phase A, the gate of the first switching tube of phase B, the gate of the second switching tube of phase B, the gate of the third switching tube of phase B, the gate of the first switching tube of phase C, the gate of the second switching tube of phase C, and the gate of the third switching tube of phase C, so as to cause the circuit subsystem of phase A, the circuit subsystem of phase B, and the circuit subsystem of phase C to rectify the AC current and convert the AC current into DC current, including:

[0097] The DC voltage output module outputs DC voltage U dc ;

[0098] For the A-phase circuit subsystem, when 1 / 2U dc When the A-phase AC current output module outputs a forward current, the external drive circuit is controlled by the drive signal, the A-phase first switch tube and the A-phase third switch tube are cut off, and the A-phase second switch tube is turned on, so that the AC current flows through the A-phase first diode, the A-phase second switch tube, the first capacitor and the second capacitor, and then obtains 1 / 2U from the A-phase rectifier switch module and the capacitor voltage divider module. dc ;

[0099] For the A-phase circuit subsystem, when 1 / 6U is required dc When the A-phase AC current output module outputs a forward current, the external drive circuit controls the A-phase third switch tube to be cut off through the drive signal, and the A-phase first switch tube and the A-phase second switch tube are turned on, so that the AC current flows through the A-phase fourth diode, the A-phase first switch tube, the A-phase second switch tube and the second capacitor, and then obtains 1 / 6U from the A-phase rectifier switch module and the capacitor voltage divider module. dc ;

[0100] For the A-phase circuit subsystem, when 1 / 6U is required dc When the A-phase AC current output module outputs a reverse current, the external drive circuit controls the A-phase third switch tube to be cut off through the drive signal, and the A-phase first switch tube and the A-phase second switch tube are turned on, so that the AC current flows through the second capacitor, the A-phase second switch tube and the A-phase third diode, and then obtains 1 / 6U from the A-phase rectifier switch module and the capacitor voltage divider module. dc ;

[0101] For the A-phase circuit subsystem, when you need to obtain -1 / 6U dc When the A-phase AC current output module outputs a forward current, the external drive circuit controls the A-phase second switch tube to be cut off through the drive signal, and the A-phase first switch tube and the A-phase third switch tube are turned on, so that the AC current flows through the A-phase fourth diode, the A-phase third switch tube, and the second capacitor, and then obtains -1 / 6U from the A-phase rectifier switch module and the capacitor voltage divider module. dc ;

[0102] For the A-phase circuit subsystem, when you need to obtain -1 / 6U dc When the A-phase AC current output module outputs a reverse current, the external drive circuit controls the A-phase second switch tube to be cut off through the drive signal, and the A-phase first switch tube and the A-phase third switch tube are turned on, so that the AC current flows through the second capacitor, the A-phase third switch tube, the A-phase first switch tube and the A-phase third diode, and then obtains -1 / 6U from the A-phase rectifier switch module and the capacitor voltage divider module. dc ;

[0103] For the A-phase circuit subsystem, when you need to obtain -1 / 2U dc When the A-phase AC current output module outputs a forward current, the external drive circuit controls the A-phase first switch tube and the A-phase second switch tube to be cut off through the drive signal, and the A-phase third switch tube is turned on, so that the AC current flows through the second capacitor, the third capacitor, the A-phase third switch tube and the A-phase second diode, and then obtains -1 / 2U from the A-phase rectifier switch module and the capacitor voltage divider module. dc .

[0104] In the above scheme, the external drive circuit controls the switching state of the switch tube through the drive signal and changes the current flow direction in the circuit. Combined with the unidirectional conductivity of the diode, a total of six different charge and discharge paths can be formed, thereby obtaining four different output voltages, achieving the output voltage of phase A at 1 / 2U dc , 1 / 6U dc 、-1 / 6U dc 、-1 / 2U dc Flexible switching between four levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0105] Figure 1 A topological circuit diagram of a rectifier provided in one embodiment of the present invention;

[0106] Figure 2 A structural diagram of a three-phase rectifier topology system provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0107] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0108] This embodiment provides a rectifier topology circuit. For details on its architecture, see Figure 1, including an AC current output module, a rectifier switch module, a capacitor voltage divider module, a DC voltage output module and an external drive circuit, wherein the rectifier switch module includes a first diode D1, a second diode D3', a third diode D0, a fourth diode D0', a first switch tube S0, a second switch tube S2 and a third switch tube S2', wherein:

[0109] The output end of the AC current output module is electrically connected to the anode of the first diode D1;

[0110] The cathode of the first diode D1 is electrically connected to the first input terminal of the capacitor voltage divider module;

[0111] The anode of the second diode D3' is electrically connected to the fourth input terminal of the capacitor voltage divider module, and the cathode of the second diode D3' is electrically connected to the anode of the first diode D1;

[0112] The anode of the third diode D0 is electrically connected to the source of the first switch tube S0, and the cathode of the third diode D0 is electrically connected to the anode of the first diode D1;

[0113] The anode of the fourth diode D0' is electrically connected to the anode of the first diode D1, and the cathode of the fourth diode D0' is electrically connected to the drain of the first switch tube S0;

[0114] The external driving circuit controls the gates of the first switching tube S0, the second switching tube S2 and the third switching tube S2' through the driving signal to turn on or off the first switching tube S0, the second switching tube S2 and the third switching tube S2';

[0115] The source of the second switch tube S2 is electrically connected to the source of the first switch tube S0, and the drain of the second switch tube S2 is electrically connected to the second input terminal of the capacitor voltage divider module;

[0116] The drain of the third switch tube S2' is electrically connected to the drain of the first switch tube S0, and the source of the third switch tube S2' is electrically connected to the third input terminal of the capacitor voltage divider module;

[0117] The positive output terminal of the DC voltage output module is electrically connected to the cathode of the first diode D1 , and the negative output terminal of the DC voltage output module is electrically connected to the anode of the second diode D3 ′.

[0118] In the above scheme, when the switch tube state is different, the current flow direction in the circuit is also different:

[0119] The DC voltage output module outputs DC voltage U dc ;

[0120] In the first case, the external drive circuit controls the first switch tube S0 and the third switch tube S2' to be turned off and the second switch tube S2 to be turned on through the drive signal; when the AC current output module outputs a forward current, the AC current flows through the first diode D1, the capacitor voltage divider module and the second switch tube S2, and the output voltage is 1 / 2U dc ;

[0121] In the second case, the external drive circuit controls the third switch tube S2' to be turned off through the drive signal, and the first switch tube S0 and the second switch tube S2 are turned on; when the AC current output module outputs a forward current, the AC current flows through the fourth diode D0', the first switch tube S0, the second switch tube S2 and the capacitor voltage divider module, and the output voltage is 1 / 6U dc ;

[0122] In the third case, the external drive circuit controls the third switch tube S2' to be turned off through the drive signal, and the first switch tube S0 and the second switch tube S2 are turned on; when the AC current output module outputs reverse current, the AC current flows through the capacitor voltage divider module, the second switch tube S2 and the third diode D0, and the output voltage is 1 / 6U dc ;

[0123] In the fourth case, the external drive circuit controls the second switch tube S2 to be turned off through the drive signal, and the first switch tube S0 and the third switch tube S2' are turned on; when the AC current output module outputs a forward current, the AC current flows through the fourth diode D0', the third switch tube S2' and the capacitor voltage divider module, and the output voltage is -1 / 6U dc ;

[0124] In the fifth case, the external drive circuit controls the second switch S2 to be turned off through the drive signal, and the first switch S0 and the third switch S2' are turned on; when the AC current output module outputs reverse current, the AC current flows through the capacitor voltage divider module, the third switch S2', the first switch S0 and the third diode D0, and the output voltage is -1 / 6U dc ;

[0125] In the sixth case, the external driving circuit controls the first switch tube S0 and the second switch tube S2 to be turned off and the third switch tube S2' to be turned on through the driving signal; when the AC current output module outputs a forward current, the AC current flows through the capacitor voltage divider module, the third switch tube S2' and the second diode D3', and the output voltage is -1 / 2U dc .

[0126] By converting AC current into DC current through a rectifier switch module, the form of electrical energy can be transformed. By controlling the on and off state of the switch tube through a drive signal, the current flow is accurately directed, preventing unreasonable circulating current or surge current in the device, reducing additional losses caused by abnormal current flow, and improving the accuracy and efficiency of power conversion. Compared to existing technologies, the above-mentioned rectifier switch module not only reduces the number of diodes used and reduces costs, but also effectively reduces conduction loss and reverse recovery loss, thereby improving the conversion efficiency of the rectifier.

[0127] Furthermore, the AC current output module includes a first AC power supply and a first inductor, wherein:

[0128] One end of the first AC power supply is electrically connected to the AC measuring terminal, and the other end is electrically connected to one end of the first inductor;

[0129] The other end of the first inductor is electrically connected to the anode of the first diode.

[0130] In the above solution, the first AC power source is electrically connected to the AC measuring terminals, allowing AC current to be fed into the rectifier switch module, providing input for subsequent rectification and voltage division steps. The use of the first inductor provides power factor correction for the circuit. When AC current passes through the first inductor, it hinders current changes, reducing the phase difference between current and voltage, improving the circuit's power factor, reducing reactive power loss, and increasing energy efficiency.

[0131] Furthermore, the capacitive voltage divider module includes a first capacitor, a second capacitor and a third capacitor, specifically:

[0132] One end of the first capacitor serves as a first input end of the capacitor voltage divider module, and the other end serves as a second input end of the capacitor voltage divider module;

[0133] One end of the second capacitor is electrically connected to one end of the first capacitor, and the other end serves as the third input end of the capacitor voltage divider module;

[0134] One end of the third capacitor is electrically connected to one end of the second capacitor, and the other end serves as the fourth input end of the capacitor voltage divider module.

[0135] In this solution, three capacitors connected in series divide the DC voltage into three equal voltages. These capacitors work in conjunction with the rectifier switch module, controlling the on and off switching of the three switches via a drive signal, directing current through different capacitors to generate a variety of output levels.

[0136] Furthermore, it also includes a load module, specifically:

[0137] The load module includes a first resistor, one end of the first resistor is electrically connected to the first input end of the capacitor voltage divider module, and the other end of the first resistor is electrically connected to the fourth input end of the capacitor voltage divider module.

[0138] In the above solution, after the rectifier switch module converts AC power into DC power, the current passes through the first resistor, where the electrical energy is dissipated in the form of heat, achieving the conversion from electrical energy to other forms of energy. The first resistor also stabilizes the circuit state. During circuit startup and shutdown, or when the input voltage or current fluctuates, the first resistor dissipates excess energy, preventing abnormal conditions such as overvoltage and overcurrent in the circuit, protecting other circuit components in each phase from damage, and preventing excessive current from impacting the diodes and switches in the rectifier switch module.

[0139] The present invention provides a three-phase rectifier topology system, including an AC current output subsystem, an A-phase circuit subsystem, a B-phase circuit subsystem, a C-phase circuit subsystem, a capacitor voltage divider module, a DC voltage output module, and an external drive circuit, wherein:

[0140] The A-phase circuit subsystem includes an A-phase rectifier switch module, specifically:

[0141] The A-phase rectifier switch module includes an A-phase first diode D A1 、A phase second diode D A3 '、A phase third diode D A0 、A phase fourth diode D A0 ', A phase first switch tube S A0 , Phase A second switch tube S A2 And the third switch tube S of phase A A2 ',in:

[0142] The first output terminal of the AC current output subsystem and the first diode D of phase A A1 Positive electrical connection;

[0143] Phase A first diode D A1 The negative electrode is electrically connected to the first input terminal of the capacitor voltage divider module;

[0144] Phase A second diode D A3 'The positive electrode is electrically connected to the fourth input terminal of the capacitor voltage divider module, and the second diode D of phase A A3 'The negative electrode and the first diode D of phase A A1 Positive electrical connection;

[0145] Phase A third diode D A0 The positive electrode and the first switching tube S of phase A A0 The source is electrically connected to the third diode D of phase A. A0 The cathode and the first diode D of phase A A1Positive electrical connection;

[0146] Phase A fourth diode D A0 'The positive electrode and the first diode D of phase A A1 Positive pole connected to the fourth diode D of phase A A0 'The negative electrode and the first switch tube S of phase A A0 Drain electrical connection;

[0147] The external drive circuit of phase A controls the first switch tube S of phase A through the drive signal A0 Gate, A phase second switch tube S A2 The gate and the third switch tube S of phase A A2 'Gate, so that the first switch tube S of phase A A0 , Phase A second switch tube S A2 And the third switch tube S of phase A A2 'On or off;

[0148] Phase A second switch tube S A2 The source is electrically connected to the source of the first switch tube, and the second switch tube S of phase A A2 The drain is electrically connected to the second input terminal of the capacitor voltage divider module;

[0149] Phase A third switch tube S A2 'Drain and A phase first switch tube S A0 Drain is electrically connected to the third switch tube S of phase A A2 'The source is electrically connected to the third input terminal of the capacitor voltage divider module;

[0150] The positive output terminal of the DC voltage output module is connected to the first diode D of phase A. A1 The negative terminal of the DC voltage output module is electrically connected to the negative output terminal of the A phase second diode D A3 'Positive electrical connection;

[0151] The B-phase circuit subsystem includes a B-phase rectifier switch module, specifically:

[0152] The B-phase rectifier switch module includes a B-phase first diode D B1 、B phase second diode D B3 ', B phase third diode D B0 、B phase fourth diode D B0 ', the first switch tube S of phase B B0 , the second switch tube S of phase B B2 And the third switch tube S of phase B B2 ',in:

[0153] The second output terminal of the AC current output subsystem is connected to the first diode D of phase B. B1 Positive electrical connection;

[0154] Phase B first diode DB1 The negative electrode is electrically connected to the first input terminal of the capacitor voltage divider module;

[0155] Phase B second diode D B3 'The positive electrode is electrically connected to the fourth input terminal of the capacitor voltage divider module, and the second diode D of phase B B3 'The negative electrode and the first diode D of phase B B1 Positive electrical connection;

[0156] Phase B third diode D B0 The positive electrode and the first switch tube S of phase B B0 The source is electrically connected to the third diode D of phase B. B0 The cathode and the first diode D of phase B B1 Positive electrical connection;

[0157] Phase B fourth diode D B0 'The positive electrode and the first diode D of phase B B1 Positive electrode connected to the fourth diode D of phase B B0 'The negative electrode and the first switch tube S of phase B B0 Drain electrical connection;

[0158] The external driving circuit of phase B controls the first switching tube S of phase B through the driving signal B0 Gate, B phase second switch tube S B2 The gate and the third switch tube S of phase B B2 'Gate, so that the first switch tube S of phase B B0 , the second switch tube S of phase B B2 And the third switch tube S of phase B B2 'On or off;

[0159] The second switch tube S of phase B B2 The source is electrically connected to the source of the first switch tube, and the second switch tube S of phase B is electrically connected to the source of the first switch tube. B2 The drain is electrically connected to the second input terminal of the capacitor voltage divider module;

[0160] Phase B third switch S B2 'Drain and B phase first switch tube S B0 The drain is electrically connected to the third switch tube S of phase B. B2 'The source is electrically connected to the third input terminal of the capacitor voltage divider module;

[0161] The positive output terminal of the DC voltage output module is connected to the first diode D of phase B. B1 The negative pole is electrically connected to the negative output terminal of the DC voltage output module and the second diode D of phase B. B3 'Positive electrical connection;

[0162] The C-phase circuit subsystem includes a C-phase rectifier switch module, specifically:

[0163] The C-phase rectifier switch module includes a C-phase first diode D C1 、C phase second diode D C3 ', C phase third diode D C0 、C phase fourth diode D C0 ', C phase first switch tube S C0 , C phase second switch tube S C2 And the third switch tube S of phase C C2 ',in:

[0164] The third output terminal of the AC current output subsystem is connected to the first diode D of phase C. C1 Positive electrical connection;

[0165] Phase C first diode D C1 The negative electrode is electrically connected to the first input terminal of the capacitor voltage divider module;

[0166] Phase C second diode D C3 'The positive electrode is electrically connected to the fourth input terminal of the capacitor voltage divider module, and the second diode D of phase C C3 'The negative electrode and the first diode D of phase C C1 Positive electrical connection;

[0167] Phase C third diode D C0 The positive electrode and the first switch tube S of phase C C0 The source is electrically connected to the third diode D of phase C. C0 The cathode and the first diode D of phase C C1 Positive electrical connection;

[0168] Phase C fourth diode D C0 'The positive electrode and the first diode D of phase C C1 Positive electrode connected to the fourth diode D of phase C C0 'The negative electrode and the first switch tube S of phase C C0 Drain electrical connection;

[0169] The external drive circuit of phase C controls the first switch tube S of phase C through the drive signal C0 Gate, C phase second switch tube S C2 The gate and the third switch tube S of phase C C2 'Gate, so that the first switch tube S of phase C C0 , C phase second switch tube S C2 And the third switch tube S of phase C C2 'On or off;

[0170] The second switch tube S of phase C C2 The source is electrically connected to the source of the first switch tube, and the second switch tube S of phase C C2 The drain is electrically connected to the second input terminal of the capacitor voltage divider module;

[0171] The third switch tube S of phase C C2 'Drain and C phase first switch tube S C0 The drain is electrically connected to the third switch tube S of phase C. C2 'The source is electrically connected to the third input terminal of the capacitor voltage divider module;

[0172] The positive output terminal of the DC voltage output module is connected to the first diode D of phase C. C1 The negative terminal of the DC voltage output module is electrically connected to the negative output terminal of the C phase second diode D C3 'Positive electrical connection.

[0173] The three-phase rectifier topology system provided by the above scheme has a simple structure. In actual application, it only needs to use the A-phase rectifier switch module, the B-phase rectifier switch module and the C-phase rectifier switch module to synchronously rectify the three-phase AC current into DC current, so as to realize the conversion of the form of electric energy. By controlling the conduction and cutoff of the switch tube through the driving signal, the current flow is accurately guided, which can avoid the unreasonable circulation or impact current in the device, reduce the additional loss caused by abnormal current flow, and improve the accuracy and efficiency of electric energy conversion. Compared with the existing technology, the above-mentioned rectifier switch module not only reduces the number of diodes used in each phase and reduces costs, but also effectively reduces conduction loss and reverse recovery loss, thereby improving the conversion efficiency of the rectifier.

[0174] In the A-phase circuit subsystem of the above three-phase rectifier topology system, the second switch tube S of the A-phase A2 And the third switch tube S of phase A A2 The driving signal of phase A first switch S A0 The driving signal is provided by the switch tube S of the external driving circuit of phase A. A1 and switch tube S A3 'After AND operation synthesis, and the third diode D of phase A A0 、A phase fourth diode D A0 ' and the first switch tube S of phase A A0 The voltage stress of the second switch tube S of phase A is 1 / 3 of the voltage provided by the DC voltage output module. A2 And the third switch tube S of phase A A2 The voltage stress is 2 / 3 of the voltage provided by the DC voltage output module, the first diode D of phase A A1 and the second diode D of phase A A3 'The voltage stress is the voltage provided by the DC voltage output module.

[0175] In the B-phase circuit subsystem of the above three-phase rectifier topology system, the second switch tube S of the B-phase B2 And the third switch tube S of phase B B2 'The driving signal of the first switch tube S of phase B is complementary. B0The driving signal is provided by the switch tube S of the B phase external driving circuit. B1 and switch tube S B3 'After AND operation synthesis, and the third diode D of phase B B0 、B phase fourth diode D B0 ' and the first switch tube S of phase B B0 The voltage stress of the B-phase second switch S is 1 / 3 of the voltage provided by the DC voltage output module. B2 And the third switch tube S of phase B B2 The voltage stress of the B phase first diode D is 2 / 3 of the voltage provided by the DC voltage output module. B1 and the second diode D of phase B B3 'The voltage stress is the voltage provided by the DC voltage output module.

[0176] In the C-phase circuit subsystem of the above three-phase rectifier topology system, the second switch tube S of the C-phase C2 And the third switch tube S of phase C C2 'The driving signal of the first switch tube S of phase C is complementary. C0 The driving signal is provided by the switch tube S of the C phase external driving circuit. C1 and switch tube S C3 'After AND operation synthesis, and the third diode D of phase C C0 、C phase fourth diode D C0 ' and the first switch tube S of phase C C0 The voltage stress is 1 / 3 of the voltage provided by the DC voltage output module, and the second switch tube S of phase C C2 And the third switch tube S of phase C C2 The voltage stress is 2 / 3 of the voltage provided by the DC voltage output module, and the first diode D of phase C C1 and the second diode D of phase C C3 'The voltage stress is the voltage provided by the DC voltage output module.

[0177] Furthermore, the AC current output subsystem, wherein the AC current output subsystem includes an A-phase AC current output module, a B-phase AC current output module and a C-phase AC current output module, is specifically:

[0178] The A-phase AC current output module includes an A-phase first AC power supply U A and the first inductor L of phase A A ,in:

[0179] The A-phase first AC power supply U A One end is electrically connected to the AC measuring terminal N, and the other end is electrically connected to the first inductor L of phase A. A One end of the device is electrically connected;

[0180] The first inductor L of phase A A The other end serves as the first output end of the AC current output subsystem;

[0181] The B-phase AC current output module includes a B-phase first AC power supply U B and the first inductor L of phase B B ,in:

[0182] The B-phase first AC power supply U B One end is electrically connected to the AC measuring terminal N, and the other end is electrically connected to the first inductor L of the B phase B One end of the device is electrically connected;

[0183] The first inductor L of phase B B The other end serves as the second output end of the AC current output subsystem;

[0184] The C-phase AC current output module includes a C-phase first AC power supply U C and the first inductor L of phase C C ,in:

[0185] The C-phase first AC power supply U C One end is electrically connected to the AC measuring terminal N, and the other end is electrically connected to the first inductor L of the C phase C One end of the device is electrically connected;

[0186] The first inductor L of phase C C The other end serves as the third output end of the AC current output subsystem.

[0187] In the above scheme, the first AC power supply of each phase is electrically connected to the AC measuring terminal N, so that the AC current of each phase can be connected to the rectifier switch module of each phase, providing input for the subsequent rectification and voltage division links. The use of the first inductor can play a role in power factor correction of the circuit, and when the AC current of each phase passes through the first inductor of each phase, it will hinder the change of current, reduce the phase difference between current and voltage, improve the power factor of the circuit, reduce reactive power loss, and improve the efficiency of electric energy utilization. In this way, the separate transmission and distribution of the three-phase AC current is realized, so that each phase circuit subsystem can independently rectify and process the AC current, and finally realize the coordinated work of the three phases, thereby improving the power transmission capacity and efficiency of the entire system.

[0188] Furthermore, the capacitive voltage divider module includes a first capacitor C1, a second capacitor C2 and a third capacitor C3, specifically:

[0189] One end of the first capacitor C1 serves as a first input end of the capacitor voltage divider module, and the other end serves as a second input end of the capacitor voltage divider module;

[0190] One end of the second capacitor C2 is electrically connected to one end of the first capacitor C1, and the other end serves as the third input end of the capacitor voltage divider module;

[0191] One end of the third capacitor C3 is electrically connected to one end of the second capacitor C2, and the other end serves as the fourth input end of the capacitor voltage divider module.

[0192] In the above scheme, three capacitors connected in series divide the DC voltage into three equal voltages. The voltage stresses of the first, second, and third capacitors C1, C2, and C3 are all 1 / 3 of the voltage provided by the DC voltage output module. These three capacitors work in conjunction with the rectifier switch modules of each phase. The three switching transistors of each phase are turned on and off by the respective phase drive signals, directing current through different capacitors to generate a variety of output levels.

[0193] Furthermore, it also includes a load module, specifically:

[0194] The load module includes a first resistor R, one end of the first resistor R is electrically connected to the first input end of the capacitive voltage divider module, and the other end of the first resistor R is electrically connected to the fourth input end of the capacitive voltage divider module.

[0195] In the above solution, after the rectifier switch module converts AC power into DC power, the current passes through the first resistor R, where the electrical energy is dissipated in the form of heat, achieving the conversion from electrical energy to other forms of energy. The first resistor R also stabilizes the circuit state. During the circuit startup and shutdown process, or when the input voltage or current fluctuates, the first resistor R can dissipate excess energy, preventing abnormal conditions such as overvoltage and overcurrent in the circuit, protecting other circuit components in each phase from damage, and preventing excessive current from impacting the diodes and switches in the rectifier switch module.

[0196] This embodiment provides a control method for a three-phase rectifier topology system, which is applied to the three-phase rectifier topology system described above. The control method includes the following steps:

[0197] Outputting AC current based on the AC current output subsystem;

[0198] The first switch tube S of phase A is controlled based on the driving signal of the external driving circuit. A0 Gate, A phase second switch tube S A2 Gate, A phase third switch tube S A2 'Gate, B phase first switch tube S B0 Gate, B phase second switch tube S B2 Gate, B phase third switch tube S B2 'Gate, C phase first switch tube S C0 Gate, C phase second switch tube S C2 The gate and the third switch tube S of phase C C2'Gate, so that the A-phase circuit subsystem, the B-phase circuit subsystem and the C-phase circuit subsystem rectify the AC current and convert the AC current into a DC current;

[0199] Provides DC voltage based on DC voltage output module;

[0200] The DC voltage is divided based on the capacitor voltage divider module to achieve multi-level output.

[0201] The control method of a three-phase rectifier topology system provided in this embodiment is simple. In practical applications, it is only necessary to convert the input three-phase AC current into DC current by controlling the switch tubes in the A-phase circuit subsystem, the B-phase circuit subsystem, and the C-phase circuit subsystem. The capacitor voltage divider module used divides the voltage of the DC voltage output module into multiple levels to achieve multi-level output. In addition, the switch gates in the three phases A, B, and C are controlled respectively by an external drive circuit to accurately guide the current flow and achieve independent rectification of each phase. It can also avoid the generation of unreasonable circulating current or inrush current in the device, reduce the additional loss caused by abnormal current flow, and improve the accuracy and efficiency of power conversion. The above control method also effectively reduces the conduction loss and reverse recovery loss, thereby improving the conversion efficiency of the three-phase rectifier topology system.

[0202] Furthermore, the driving signal based on the external driving circuit controls the first switching tube S of phase A. A0 Gate, A phase second switch tube S A2 Gate, A phase third switch tube S A2 'Gate, B phase first switch tube S B0 Gate, B phase second switch tube S B2 Gate, B phase third switch tube S B2 'Gate, C phase first switch tube S C0 Gate, C phase second switch tube S C2 The gate and the third switch tube S of phase C C2 'gate, so that the A-phase circuit subsystem, the B-phase circuit subsystem and the C-phase circuit subsystem rectify the AC current and convert the AC current into a DC current, including:

[0203] The DC voltage output module outputs DC voltage U dc ;

[0204] For the A phase circuit subsystem, the current flows along the first diode D of phase A. A1 The direction of current flowing into the rectifier is forward;

[0205] For the A-phase circuit subsystem, when 1 / 2U dc When the power factor is unity, the A-phase AC current output module outputs a forward current, and the external drive circuit is controlled by the drive signal. The first switch tube S of the A-phaseA0 And the third switch tube S of phase A A2 'Turn off, the second switch tube S of phase A A2 turns on, so that the AC current flows through the first diode D of phase A A1 , Phase A second switch tube S A2 , the first capacitor C1 and the second capacitor C2, and then obtain 1 / 2U from the A phase rectifier switch module and the capacitor voltage divider module dc ; At this time, the third diode D of phase A A0 and the first switching tube S of phase A A0 They bear the voltage of the first capacitor C1 and the second capacitor C2 respectively, which is 1 / 3U dc ; Phase A third switch tube S A2 'The sum of the voltages of the first capacitor C1 and the second capacitor C2 is 2 / 3U dc ; Phase A second diode D A3 'Assume voltage U dc .

[0206] For the A-phase circuit subsystem, when 1 / 6U is required dc When the power factor is unity, the A-phase AC current output module outputs a forward current, and the external drive circuit controls the A-phase third switch S through the drive signal. A2 'Turn off, the first switch tube S of phase A A0 and the second switch tube S of phase A A2 turns on, so that the AC current flows through the fourth diode D of phase A A0 ', A phase first switch tube S A0 , Phase A second switch tube S A2 And the second capacitor C2, and then get 1 / 6U from the A phase rectifier switch module and the capacitor voltage divider module dc ; At this time, the first diode D of phase A A1 Bear the voltage of the first capacitor C1, which is 1 / 3U dc ; Phase A third diode D A0 The potentials on both sides are equal and do not bear voltage; the third switch tube S of phase A A2 'Bear the voltage of the second capacitor C2, which is 1 / 3U dc ; Phase A second diode D A3 'The sum of the voltages of the first capacitor C1 and the second capacitor C2 is 2 / 3U dc .

[0207] For the A-phase circuit subsystem, when 1 / 6U is required dc When the power factor is unity, the A-phase AC current output module outputs a reverse current, and the external drive circuit controls the A-phase third switch S through the drive signal. A2 'Turn off, the first switch tube S of phase A A0and the second switch tube S of phase A A2 is turned on, so that the AC current flows through the second capacitor C2 and the second switch tube S of phase A. A2 and the third diode D of phase A A0 , and then get 1 / 6U from the A phase rectifier switch module and capacitor voltage divider module dc ; At this time, the first diode D of phase A A1 Bear the voltage of the first capacitor C1, which is 1 / 3U dc ; Phase A third diode D A0 The potentials on both sides are equal and do not bear voltage; the third switch tube S of phase A A2 'Bear the voltage of the second capacitor C2, which is 1 / 3U dc ; Phase A second diode D A3 The sum of the voltages of the second capacitor C2 and the third capacitor C3 is 2 / 3U dc .

[0208] For the A-phase circuit subsystem, when you need to obtain -1 / 6U dc When the power factor is unity, the A-phase AC current output module outputs a forward current, and the external drive circuit controls the A-phase second switch S through the drive signal. A2 Cut off, the first switch tube S of phase A A0 And the third switch tube S of phase A A2 ' is turned on so that the AC current flows through the fourth diode D of phase A A0 ', Phase A third switch tube S A2 ', and the second capacitor C2, and then get -1 / 6U from the A phase rectifier switch module and the capacitor voltage divider module dc ; At this time, the second diode D of phase A A3 'Bear the voltage of the third capacitor C3, which is 1 / 3U dc Phase A third diode D A0 The potentials on both sides are equal and do not bear voltage; the third switch tube S of phase A A2 'Bear the voltage of the second capacitor C2, which is 1 / 3U dc ; Phase A first diode D A1 The sum of the voltages of the second capacitor C2 and the first capacitor C1 is 2 / 3U dc .

[0209] For the A-phase circuit subsystem, when you need to obtain -1 / 6U dc When the power factor is unity, the A-phase AC current output module outputs a reverse current, and the external drive circuit controls the A-phase second switch S through the drive signal. A2 Cut off, the first switch tube S of phase A A0 And the third switch tube S of phase A A2' is turned on so that the AC current flows through the second capacitor C2 and the third switch tube S of phase A. A2 ', A phase first switch tube S A0 and the third diode D of phase A A0 , and then get -1 / 6U from the A phase rectifier switch module and capacitor voltage divider module dc ; At this time, the second diode D of phase A A3 'Bear the voltage of the third capacitor C3, which is 1 / 3U dc Phase A third diode D A0 The potentials on both sides are equal and do not bear voltage; the second switch tube S of phase A A2 The voltage of the second capacitor C2 is 1 / 3U dc ; Phase A first diode D A1 The sum of the voltages of the second capacitor C2 and the first capacitor C1 is 2 / 3U dc .

[0210] For the A-phase circuit subsystem, when you need to obtain -1 / 2U dc When the power factor is unity, the A-phase AC current output module outputs a forward current, and the external drive circuit controls the first switch tube S of the A-phase through the drive signal. A0 and the second switch tube S of phase A A2 Cut off, the third switch tube S of phase A A2 ' is turned on so that the AC current flows through the second capacitor C2, the third capacitor C3, and the third switch tube S of phase A. A2 ' and the second diode D of phase A A3 ', and then get -1 / 2U from the A phase rectifier switch module and capacitor voltage divider module dc At this time, the third diode D of phase A A0 ' and the first switch tube S of phase A A0 They bear the voltage of the third capacitor C3 and the second capacitor C2 respectively, which is 1 / 3U dc The second switch tube S of phase A A2 The sum of the voltages of the third capacitor C3 and the second capacitor C2 is 2 / 3U dc Phase A first diode D A1 Bearing voltage U dc .

[0211] Since the structures of the A-phase circuit subsystem, the B-phase circuit subsystem, and the C-phase circuit subsystem are the same, the steps of rectifying the AC current and converting the AC current into the DC current in the A-phase circuit subsystem can be obtained accordingly:

[0212] For the B phase circuit subsystem, the current flows along the first diode D of the B phase. B1The direction of current flowing into the rectifier is forward;

[0213] For the B-phase circuit subsystem, when 1 / 2U dc When the power factor is unity, the B-phase AC current output module outputs a forward current, and the external drive circuit is controlled by the drive signal. The first switch tube S of the B phase B0 And the third switch tube S of phase B B2 'Turn off, the second switch tube S of phase B B2 turns on, so that the AC current flows through the first diode D of phase B B1 , the second switch tube S of phase B B2 , the first capacitor C1 and the second capacitor C2, and then obtain 1 / 2U from the B phase rectifier switch module and the capacitor voltage divider module dc ; At this time, the third diode D of phase B B0 and the first switch tube S of phase B B0 They bear the voltage of the first capacitor C1 and the second capacitor C2 respectively, which is 1 / 3U dc ; B phase third switch tube S B2 'The sum of the voltages of the first capacitor C1 and the second capacitor C2 is 2 / 3U dc ; B phase second diode D B3 'Assume voltage U dc .

[0214] For the B-phase circuit subsystem, when 1 / 6U is required dc When the power factor is unity, the B-phase AC current output module outputs a forward current, and the external drive circuit controls the B-phase third switch S through the drive signal. B2 'Turn off, the first switch tube S of phase B B0 and the second switch tube S of phase B B2 turns on, so that the AC current flows through the fourth diode D of phase B B0 ', the first switch tube S of phase B B0 , the second switch tube S of phase B B2 And the second capacitor C2, and then get 1 / 6U from the B phase rectifier switch module and the capacitor voltage divider module dc ; At this time, the first diode D of phase B B1 Bear the voltage of the first capacitor C1, which is 1 / 3U dc ;B phase third diode D B0 The potentials on both sides are equal and do not bear voltage; the third switch tube S of phase B B2 'Bear the voltage of the second capacitor C2, which is 1 / 3U dc ; B phase second diode D B3 'The sum of the voltages of the first capacitor C1 and the second capacitor C2 is 2 / 3U dc .

[0215] For the B-phase circuit subsystem, when 1 / 6U is required dc When the power factor is unity, the B-phase AC current output module outputs a reverse current, and the external drive circuit controls the B-phase third switch S through the drive signal. B2 'Turn off, the first switch tube S of phase B B0 and the second switch tube S of phase B B2 is turned on, so that the AC current flows through the second capacitor C2 and the second switch tube S of the B phase B2 and the third diode D of phase B B0 , and then get 1 / 6U from the B phase rectifier switch module and capacitor voltage divider module dc ; At this time, the first diode D of phase B B1 Bear the voltage of the first capacitor C1, which is 1 / 3U dc ;B phase third diode D B0 The potentials on both sides are equal and do not bear voltage; the third switch tube S of phase B B2 'Bear the voltage of the second capacitor C2, which is 1 / 3U dc ; B phase second diode D B3 The sum of the voltages of the second capacitor C2 and the third capacitor C3 is 2 / 3U dc .

[0216] For the B-phase circuit subsystem, when you need to obtain -1 / 6U dc When the power factor is unity, the B-phase AC current output module outputs a forward current, and the external drive circuit controls the B-phase second switch S through the drive signal. B2 Cut off, the first switch tube S of phase B B0 And the third switch tube S of phase B B2 ' is turned on so that the AC current flows through the fourth diode D of phase B B0 ', the third switch tube S of phase B B2 ', and the second capacitor C2, and then get -1 / 6U from the B phase rectifier switch module and the capacitor voltage divider module dc ; At this time, the second diode D of phase B B3 'Bear the voltage of the third capacitor C3, which is 1 / 3U dc The third diode D of phase B B0 The potentials on both sides are equal and do not bear voltage; the third switch tube S of phase B B2 'Bear the voltage of the second capacitor C2, which is 1 / 3U dc ;B phase first diode D B1 The sum of the voltages of the second capacitor C2 and the first capacitor C1 is 2 / 3U dc .

[0217] For the B-phase circuit subsystem, when you need to obtain -1 / 6U dcWhen the power factor is unity, the B-phase AC current output module outputs a reverse current, and the external drive circuit controls the second switch tube S of the B-phase through the drive signal. B2 Cut off, the first switch tube S of phase B B0 And the third switch tube S of phase B B2 ' is turned on, so that the AC current flows through the second capacitor C2 and the third switch tube S of phase B B2 ', the first switch tube S of phase B B0 and the third diode D of phase B B0 , and then get -1 / 6U from the B phase rectifier switch module and capacitor voltage divider module dc ; At this time, the second diode D of phase B B3 'Bear the voltage of the third capacitor C3, which is 1 / 3U dc The third diode D of phase B B0 The potentials on both sides are equal and do not bear voltage; the second switch tube S of phase B B2 The voltage of the second capacitor C2 is 1 / 3U dc ;B phase first diode D B1 The sum of the voltages of the second capacitor C2 and the first capacitor C1 is 2 / 3U dc .

[0218] For the B-phase circuit subsystem, when -1 / 2U is required dc When the power factor is unity, the B-phase AC current output module outputs a forward current, and the external drive circuit controls the first switch tube S of the B-phase through the drive signal. B0 and the second switch tube S of phase B B2 Cut off, the third switch tube S of phase B B2 ' is turned on so that the AC current flows through the second capacitor C2, the third capacitor C3, and the third switch tube S of the B phase B2 ' and the second diode D of phase B B3 ', and then get -1 / 2U from the B phase rectifier switch module and capacitor voltage divider module dc At this time, the third diode D of phase B B0 ' and the first switch tube S of phase B B0 They bear the voltage of the third capacitor C3 and the second capacitor C2 respectively, which is 1 / 3U dc The second switch tube S of phase B B2 The sum of the voltages of the third capacitor C3 and the second capacitor C2 is 2 / 3U dc The first diode D of phase B B1 Bearing voltage U dc .

[0219] For the C phase circuit subsystem, the current flows along the first diode D of the C phase. C1 The direction of current flowing into the rectifier is forward;

[0220] For the C phase circuit subsystem, when 1 / 2U dc When the power factor is unity, the C-phase AC current output module outputs a forward current, and the external drive circuit is controlled by the drive signal. The first switch tube S of the C-phase C0 And the third switch tube S of phase C C2 ' is turned off, the second switch tube S of phase C C2 is turned on so that the AC current flows through the first diode D of phase C C1 , C phase second switch tube S C2 , the first capacitor C1 and the second capacitor C2, and then obtain 1 / 2U from the C phase rectifier switch module and the capacitor voltage divider module dc ; At this time, the third diode D of phase C C0 and the first switch tube S of phase C C0 They bear the voltage of the first capacitor C1 and the second capacitor C2 respectively, which is 1 / 3U dc ; The third switch tube S of phase C C2 'The sum of the voltages of the first capacitor C1 and the second capacitor C2 is 2 / 3U dc ;C phase second diode D C3 'Assume voltage U dc .

[0221] For the C-phase circuit subsystem, when 1 / 6U is required dc When the power factor is unity, the C-phase AC current output module outputs a forward current, and the external drive circuit controls the C-phase third switch S through the drive signal. C2 'Turn off, the first switch tube S of phase C C0 and the second switch tube S of phase C C2 turns on, so that the AC current flows through the fourth diode D of phase C C0 ', C phase first switch tube S C0 , C phase second switch tube S C2 And the second capacitor C2, and then get 1 / 6U from the C phase rectifier switch module and the capacitor voltage divider module dc ; At this time, the first diode D of phase C C1 Bear the voltage of the first capacitor C1, which is 1 / 3U dc ;C phase third diode D C0 The potentials on both sides are equal and do not bear voltage; the third switch tube S of phase C C2 'Bear the voltage of the second capacitor C2, which is 1 / 3U dc ;C phase second diode D C3 'The sum of the voltages of the first capacitor C1 and the second capacitor C2 is 2 / 3U dc .

[0222] For the C-phase circuit subsystem, when 1 / 6U is required dcWhen the power factor is unity, the C-phase AC current output module outputs a reverse current, and the external drive circuit controls the C-phase third switch S through the drive signal. C2 'Turn off, the first switch tube S of phase C C0 and the second switch tube S of phase C C2 is turned on, so that the AC current flows through the second capacitor C2 and the second switch tube S of the C phase C2 and the third diode D of phase C C0 , and then get 1 / 6U from the C-phase rectifier switch module and capacitor voltage divider module dc ; At this time, the first diode D of phase C C1 Bear the voltage of the first capacitor C1, which is 1 / 3U dc ;C phase third diode D C0 The potentials on both sides are equal and do not bear voltage; the third switch tube S of phase C C2 'Bear the voltage of the second capacitor C2, which is 1 / 3U dc ;C phase second diode D C3 The sum of the voltages of the second capacitor C2 and the third capacitor C3 is 2 / 3U dc .

[0223] For the C-phase circuit subsystem, when you need to obtain -1 / 6U dc When the power factor is unity, the C-phase AC current output module outputs a forward current, and the external drive circuit controls the C-phase second switch S through the drive signal. C2 Cut off, the first switch tube S of phase C C0 And the third switch tube S of phase C C2 ' is turned on so that the AC current flows through the fourth diode D of phase C C0 ', the third switch tube S of phase C C2 ', and the second capacitor C2, and then from the C phase rectifier switch module and the capacitor voltage divider module to obtain -1 / 6U dc ; At this time, the second diode D of phase C C3 'Bear the voltage of the third capacitor C3, which is 1 / 3U dc The third diode D of phase C C0 The potentials on both sides are equal and do not bear voltage; the third switch tube S of phase C C2 'Bear the voltage of the second capacitor C2, which is 1 / 3U dc ;C phase first diode D C1 The sum of the voltages of the second capacitor C2 and the first capacitor C1 is 2 / 3U dc .

[0224] For the C-phase circuit subsystem, when you need to obtain -1 / 6U dcWhen the power factor is unity, the C-phase AC current output module outputs a reverse current, and the external drive circuit controls the C-phase second switch S through the drive signal. C2 Cut off, the first switch tube S of phase C C0 And the third switch tube S of phase C C2 ' is turned on, so that the AC current flows through the second capacitor C2 and the third switch tube S of phase C C2 ', C phase first switch tube S C0 and the third diode D of phase C C0 , and then get -1 / 6U from the C-phase rectifier switch module and capacitor voltage divider module dc ; At this time, the second diode D of phase C C3 'Bear the voltage of the third capacitor C3, which is 1 / 3U dc The third diode D of phase C C0 The potentials on both sides are equal and do not bear voltage; the second switch tube S of phase C C2 The voltage of the second capacitor C2 is 1 / 3U dc ;C phase first diode D C1 The sum of the voltages of the second capacitor C2 and the first capacitor C1 is 2 / 3U dc .

[0225] For the C-phase circuit subsystem, when you need to obtain -1 / 2U dc When the power factor is unity, the C-phase AC current output module outputs a forward current, and the external drive circuit controls the first switch tube S of the C-phase through the drive signal. C0 and the second switch tube S of phase C C2 Cut off, the third switch tube S of phase C C2 ' is turned on so that the AC current flows through the second capacitor C2, the third capacitor C3, and the C phase third switch S C2 ' and the second diode D of phase C C3 ', and then get -1 / 2U from the C phase rectifier switch module and capacitor voltage divider module dc At this time, the third diode D C0 ' and the first switch tube S of phase C C0 They bear the voltage of the third capacitor C3 and the second capacitor C2 respectively, which is 1 / 3U dc The second switch tube S of phase C C2 The sum of the voltages of the third capacitor C3 and the second capacitor C2 is 2 / 3U dc . The first diode D of phase C C1 Bearing voltage U dc .

[0226] In this embodiment, the external drive circuit can control the switch tube to form four switch states through the drive signal. By changing the current flow direction in the circuit and combining the unidirectional conductivity of the diode, a total of six different charge and discharge paths can be formed, thereby obtaining four different output voltages, achieving the output voltage of phase A, phase B and phase C within 1 / 2U dc , 1 / 6U dc 、-1 / 6U dc 、-1 / 2U dc Flexible switching between four levels.

[0227] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A rectifier topology circuit, characterized in that: It includes an AC current output module, a rectifier switch module, a capacitor voltage divider module, a DC voltage output module and an external drive circuit. The rectifier switch module includes a first diode, a second diode, a third diode, a fourth diode, a first switch tube, a second switch tube and a third switch tube, wherein: The output end of the AC current output module is electrically connected to the anode of the first diode; The cathode of the first diode is electrically connected to the first input terminal of the capacitor voltage divider module; The anode of the second diode is electrically connected to the fourth input terminal of the capacitor voltage divider module, and the cathode of the second diode is electrically connected to the anode of the first diode; The anode of the third diode is electrically connected to the source of the first switch tube, and the cathode of the third diode is electrically connected to the anode of the first diode; The anode of the fourth diode is electrically connected to the anode of the first diode, and the cathode of the fourth diode is electrically connected to the drain of the first switching tube; The external driving circuit controls the gates of the first switching tube, the second switching tube, and the third switching tube through a driving signal to turn on or off the first switching tube, the second switching tube, and the third switching tube; The source electrode of the second switch tube is electrically connected to the source electrode of the first switch tube, and the drain electrode of the second switch tube is electrically connected to the second input terminal of the capacitor voltage divider module; The drain of the third switch tube is electrically connected to the drain of the first switch tube, and the source of the third switch tube is electrically connected to the third input terminal of the capacitor voltage divider module; The positive output terminal of the DC voltage output module is electrically connected to the cathode of the first diode, and the negative output terminal of the DC voltage output module is electrically connected to the anode of the second diode.

2. A rectifier topology circuit according to claim 1, characterized in that: The AC current output module includes a first AC power supply and a first inductor, wherein: One end of the first AC power supply is electrically connected to the AC measuring terminal, and the other end is electrically connected to one end of the first inductor; The other end of the first inductor is electrically connected to the anode of the first diode.

3. The rectifier topology circuit according to claim 1, characterized in that: The capacitor voltage divider module includes a first capacitor, a second capacitor and a third capacitor, specifically: One end of the first capacitor serves as a first input end of the capacitor voltage divider module, and the other end serves as a second input end of the capacitor voltage divider module; One end of the second capacitor is electrically connected to one end of the first capacitor, and the other end serves as the third input end of the capacitor voltage divider module; One end of the third capacitor is electrically connected to one end of the second capacitor, and the other end serves as the fourth input end of the capacitor voltage divider module.

4. The rectifier topology circuit according to claim 1, characterized in that: Also included are load modules, specifically: The load module includes a first resistor, one end of the first resistor is electrically connected to the first input end of the capacitor voltage divider module, and the other end of the first resistor is electrically connected to the fourth input end of the capacitor voltage divider module.

5. A three-phase rectifier topology system, characterized in that: It includes an AC current output subsystem, an A-phase circuit subsystem, a B-phase circuit subsystem, a C-phase circuit subsystem, a capacitor voltage divider module, a DC voltage output module and an external drive circuit, wherein: The A-phase circuit subsystem includes an A-phase rectifier switch module, specifically: The A-phase rectifier switch module includes an A-phase first diode, an A-phase second diode, an A-phase third diode, an A-phase fourth diode, an A-phase first switch tube, an A-phase second switch tube, and an A-phase third switch tube, wherein: The first output terminal of the AC current output subsystem is electrically connected to the anode of the first diode of phase A; The cathode of the first diode of phase A is electrically connected to the first input end of the capacitor voltage divider module; The anode of the second diode of phase A is electrically connected to the fourth input terminal of the capacitor voltage divider module, and the cathode of the second diode of phase A is electrically connected to the anode of the first diode of phase A; The anode of the third diode of phase A is electrically connected to the source of the first switching tube of phase A, and the cathode of the third diode of phase A is electrically connected to the anode of the first diode of phase A; The anode of the fourth diode of phase A is electrically connected to the anode of the first diode of phase A, and the cathode of the fourth diode of phase A is electrically connected to the drain of the first switching tube of phase A; The external drive circuit of phase A controls the gates of the first switching tube of phase A, the second switching tube of phase A, and the third switching tube of phase A through a drive signal to turn on or off the first switching tube of phase A, the second switching tube of phase A, and the third switching tube of phase A; The source electrode of the second switching tube of phase A is electrically connected to the source electrode of the first switching tube, and the drain electrode of the second switching tube of phase A is electrically connected to the second input end of the capacitor voltage divider module; The drain of the third switching tube of phase A is electrically connected to the drain of the first switching tube of phase A, and the source of the third switching tube of phase A is electrically connected to the third input terminal of the capacitor voltage divider module; The positive output terminal of the DC voltage output module is electrically connected to the cathode of the first diode of phase A, and the negative output terminal of the DC voltage output module is electrically connected to the anode of the second diode of phase A; The B-phase circuit subsystem includes a B-phase rectifier switch module, specifically: The B-phase rectifier switch module includes a B-phase first diode, a B-phase second diode, a B-phase third diode, a B-phase fourth diode, a B-phase first switch tube, a B-phase second switch tube and a B-phase third switch tube, wherein: The second output terminal of the AC current output subsystem is electrically connected to the anode of the first diode of phase B; The cathode of the first diode of phase B is electrically connected to the first input end of the capacitor voltage divider module; The anode of the second diode of phase B is electrically connected to the fourth input terminal of the capacitor voltage divider module, and the cathode of the second diode of phase B is electrically connected to the anode of the first diode of phase B; The anode of the third diode of phase B is electrically connected to the source of the first switching tube of phase B, and the cathode of the third diode of phase B is electrically connected to the anode of the first diode of phase B; The anode of the fourth diode of phase B is electrically connected to the anode of the first diode of phase B, and the cathode of the fourth diode of phase B is electrically connected to the drain of the first switching tube of phase B; The B-phase external drive circuit controls the gates of the first, second, and third switching tubes of the B-phase through a drive signal to turn on or off the first, second, and third switching tubes of the B-phase. The source electrode of the second switching tube of phase B is electrically connected to the source electrode of the first switching tube, and the drain electrode of the second switching tube of phase B is electrically connected to the second input end of the capacitor voltage divider module; The drain of the third switching tube of phase B is electrically connected to the drain of the first switching tube of phase B, and the source of the third switching tube of phase B is electrically connected to the third input terminal of the capacitor voltage divider module; The positive output terminal of the DC voltage output module is electrically connected to the cathode of the first diode of phase B, and the negative output terminal of the DC voltage output module is electrically connected to the anode of the second diode of phase B; The C-phase circuit subsystem includes a C-phase rectifier switch module, specifically: The C-phase rectifier switch module includes a C-phase first diode, a C-phase second diode, a C-phase third diode, a C-phase fourth diode, a C-phase first switch tube, a C-phase second switch tube and a C-phase third switch tube, wherein: The third output terminal of the AC current output subsystem is electrically connected to the anode of the first diode of phase C; The cathode of the first diode of phase C is electrically connected to the first input end of the capacitor voltage divider module; The anode of the second diode of phase C is electrically connected to the fourth input terminal of the capacitor voltage divider module, and the cathode of the second diode of phase C is electrically connected to the anode of the first diode of phase C; The anode of the third diode of phase C is electrically connected to the source of the first switching tube of phase C, and the cathode of the third diode of phase C is electrically connected to the anode of the first diode of phase C; The anode of the fourth diode of phase C is electrically connected to the anode of the first diode of phase C, and the cathode of the fourth diode of phase C is electrically connected to the drain of the first switching tube of phase C; The C-phase external drive circuit controls the gates of the first, second, and third switching tubes of the C-phase through a drive signal to turn on or off the first, second, and third switching tubes of the C-phase; The source electrode of the second switching tube of phase C is electrically connected to the source electrode of the first switching tube, and the drain electrode of the second switching tube of phase C is electrically connected to the second input end of the capacitor voltage divider module; The drain of the third switching tube of phase C is electrically connected to the drain of the first switching tube of phase C, and the source of the third switching tube of phase C is electrically connected to the third input terminal of the capacitor voltage divider module; The positive output terminal of the DC voltage output module is electrically connected to the cathode of the first diode of phase C, and the negative output terminal of the DC voltage output module is electrically connected to the anode of the second diode of phase C.

6. A three-phase rectifier topology system according to claim 5, characterized in that: The AC current output subsystem, wherein the AC current output subsystem includes an A-phase AC current output module, a B-phase AC current output module, and a C-phase AC current output module, specifically: The A-phase AC current output module includes an A-phase first AC power supply and an A-phase first inductor, wherein: One end of the A-phase first AC power supply is electrically connected to the AC measuring terminal, and the other end is electrically connected to one end of the A-phase first inductor; The other end of the first inductor of phase A serves as the first output end of the AC current output subsystem; The B-phase AC current output module includes a B-phase first AC power supply and a B-phase first inductor, wherein: One end of the B-phase first AC power supply is electrically connected to the AC measuring terminal, and the other end is electrically connected to one end of the B-phase first inductor; The other end of the first inductor of phase B serves as the second output end of the AC current output subsystem; The C-phase AC current output module includes a C-phase first AC power supply and a C-phase first inductor, wherein: One end of the C-phase first AC power supply is electrically connected to the AC measuring terminal, and the other end is electrically connected to one end of the C-phase first inductor; The other end of the first inductor of phase C serves as the third output end of the AC current output subsystem.

7. The three-phase rectifier topology system according to claim 5, characterized in that: The capacitor voltage divider module includes a first capacitor, a second capacitor and a third capacitor, specifically: One end of the first capacitor serves as a first input end of the capacitor voltage divider module, and the other end serves as a second input end of the capacitor voltage divider module; One end of the second capacitor is electrically connected to one end of the first capacitor, and the other end serves as the third input end of the capacitor voltage divider module; One end of the third capacitor is electrically connected to one end of the second capacitor, and the other end serves as the fourth input end of the capacitor voltage divider module.

8. The three-phase rectifier topology system according to claim 5, characterized in that: Also included are load modules, specifically: The load module includes a first resistor, one end of the first resistor is electrically connected to the first input end of the capacitor voltage divider module, and the other end of the first resistor is electrically connected to the fourth input end of the capacitor voltage divider module.

9. A control method for a three-phase rectifier topology system, characterized in that: Applied to a three-phase rectifier topology system according to any one of claims 5 to 8, the control method comprises the following steps: Outputting AC current based on the AC current output subsystem; Based on a drive signal from an external drive circuit, the gate of the first switching tube of phase A, the gate of the second switching tube of phase A, the gate of the third switching tube of phase A, the gate of the first switching tube of phase B, the gate of the second switching tube of phase B, the gate of the third switching tube of phase B, the gate of the first switching tube of phase C, the gate of the second switching tube of phase C, and the gate of the third switching tube of phase C are controlled to cause the circuit subsystem of phase A, the circuit subsystem of phase B, and the circuit subsystem of phase C to rectify the AC current and convert the AC current into DC current; Provides DC voltage based on DC voltage output module; The DC voltage is divided based on the capacitor voltage divider module to achieve multi-level output.

10. The control method of a three-phase rectifier topology system according to claim 9, characterized in that: The drive signal based on the external drive circuit controls the gate of the first switch tube of phase A, the gate of the second switch tube of phase A, the gate of the third switch tube of phase A, the gate of the first switch tube of phase B, the gate of the second switch tube of phase B, the gate of the third switch tube of phase B, the gate of the first switch tube of phase C, the gate of the second switch tube of phase C, and the gate of the third switch tube of phase C, so as to make the circuit subsystem of phase A, the circuit subsystem of phase B, and the circuit subsystem of phase C rectify the AC current and convert the AC current into DC current, including: The DC voltage output module outputs DC voltage U dc ; For the A-phase circuit subsystem, when 1 / 2U dc When the A-phase AC current output module outputs a forward current, the external drive circuit is controlled by the drive signal, the A-phase first switch tube and the A-phase third switch tube are cut off, and the A-phase second switch tube is turned on, so that the AC current flows through the A-phase first diode, the A-phase second switch tube, the first capacitor and the second capacitor, and then obtains 1 / 2U from the A-phase rectifier switch module and the capacitor voltage divider module. dc ; For the A-phase circuit subsystem, when 1 / 6U is required dc When the A-phase AC current output module outputs a forward current, the external drive circuit controls the A-phase third switch tube to be cut off through the drive signal, and the A-phase first switch tube and the A-phase second switch tube are turned on, so that the AC current flows through the A-phase fourth diode, the A-phase first switch tube, the A-phase second switch tube and the second capacitor, and then obtains 1 / 6U from the A-phase rectifier switch module and the capacitor voltage divider module. dc ; For the A-phase circuit subsystem, when 1 / 6U is required dc When the A-phase AC current output module outputs a reverse current, the external drive circuit controls the A-phase third switch tube to be cut off through the drive signal, and the A-phase first switch tube and the A-phase second switch tube are turned on, so that the AC current flows through the second capacitor, the A-phase second switch tube and the A-phase third diode, and then obtains 1 / 6U from the A-phase rectifier switch module and the capacitor voltage divider module. dc ; For the A-phase circuit subsystem, when you need to obtain -1 / 6U dc When the A-phase AC current output module outputs a forward current, the external drive circuit controls the A-phase second switch tube to be cut off through the drive signal, and the A-phase first switch tube and the A-phase third switch tube are turned on, so that the AC current flows through the A-phase fourth diode, the A-phase third switch tube, and the second capacitor, and then obtains -1 / 6U from the A-phase rectifier switch module and the capacitor voltage divider module. dc ; For the A-phase circuit subsystem, when you need to obtain -1 / 6U dc When the A-phase AC current output module outputs a reverse current, the external drive circuit controls the A-phase second switch tube to be cut off through the drive signal, and the A-phase first switch tube and the A-phase third switch tube are turned on, so that the AC current flows through the second capacitor, the A-phase third switch tube, the A-phase first switch tube and the A-phase third diode, and then obtains -1 / 6U from the A-phase rectifier switch module and the capacitor voltage divider module. dc ; For the A-phase circuit subsystem, when you need to obtain -1 / 2U dc When the A-phase AC current output module outputs a forward current, the external drive circuit controls the A-phase first switch tube and the A-phase second switch tube to be cut off through the drive signal, and the A-phase third switch tube is turned on, so that the AC current flows through the second capacitor, the third capacitor, the A-phase third switch tube and the A-phase second diode, and then obtains -1 / 2U from the A-phase rectifier switch module and the capacitor voltage divider module. dc .

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