Traction motor driven inverter

Abstract

The embodiment of the invention relates to an urban rail transit traction driving device, and discloses a traction motor driving inverter which comprises a main loop and a control loop. A charging circuit, a direct current filter circuit and a three-phase inversion unit circuit are arranged in a main loop to form a basic loop of the inverter; a DSP (Digital Signal Processor) main control chip and at least one signal processing module connected with the DSP main control chip are arranged in a control loop, and each signal processing module is connected with a specified circuit node in a main loop, so that node signals at the circuit nodes are transmitted to the DSP main control chip through the signal processing modules; and / or the corresponding circuit nodes are controlled according to control signals which are sent by the DSP main control chip and aim at the circuit nodes; therefore, the output end of the three-phase inverter unit circuit provides three-phase power supply voltages of different levels for the traction motor under the control of the control loop, and the three-phase inverter unit circuit has universality and is suitable for traction motors of different models.

Description

Technical Field

[0001] The embodiments of the present application relate to an urban rail transit traction drive device, and in particular to a traction motor drive inverter. Background Art

[0002] The performance of the equipment in the urban rail transit traction system will inevitably decline after a certain period of use, but after a system overhaul, the equipment needs to be able to continue to complete the functions assigned by the traction system. The service consistency test is used to verify in which aspects the equipment does not meet the requirements of the system application, which is helpful for the maintenance and update of the equipment. At present, the traction motor drive device and the motor are directly customized, and the test traction motor drive device should be universal and suitable for different types of traction motors. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a traction motor drive inverter, which is more versatile and suitable for different models of traction motors when used as a test traction motor drive device.

[0004] To solve the above technical problems, an embodiment of the present application provides a traction motor drive inverter, comprising: a main circuit and a control circuit;

[0005] The main circuit includes: a charging circuit, a DC filter circuit and a three-phase inverter unit circuit connected in sequence from the input end to the output end; the input end of the charging circuit is used for externally connecting a DC input voltage;

[0006] The control loop comprises: a DSP main control chip, and at least one signal processing module connected to the DSP main control chip; each of the signal processing modules is connected to a designated circuit node in the main loop, and is used to obtain a node signal at the connected circuit node and transmit it to the DSP main control chip, and / or control the corresponding circuit node according to a control signal for the connected circuit node sent by the DSP main control chip; wherein the control signal for each circuit node is obtained through comprehensive calculation based on the node signal at each circuit node and an externally input control parameter;

[0007] The output end of the three-phase inverter unit circuit is used to provide three-phase power supply voltages of different levels to the traction motor under the control of the control loop.

[0008] In the traction motor drive inverter as described above, the charging circuit includes: a contactor, a charging resistor and a charging capacitor; the branch formed by the contactor and the charging resistor being connected in parallel is connected in series to the positive branch of the DC input voltage, and the charging capacitor is connected in parallel between the positive voltage and the negative voltage of the DC input voltage;

[0009] The at least one signal processing module includes a charging signal processing module; the charging signal processing module is connected to the contactor and is used to control the contactor action according to the control signal for the contactor action sent by the DSP main control chip to put the charging circuit in a charging state or a non-charging state.

[0010] In the traction motor drive inverter as described above, the DC filter module includes: a filter inductor, a filter resistor and a DC bus capacitor;

[0011] The filter inductor is connected in series to the positive branch of the DC input voltage; the filter resistor (R2) and the DC bus capacitor are respectively connected to one end of the filter inductor away from the DC input voltage and between the negative voltage of the DC input voltage;

[0012] The at least one signal processing module includes a bus voltage signal processing module; the bus voltage signal processing module is connected to the DC bus capacitor and is used to detect the DC bus voltage at both ends of the DC bus capacitor and transmit it to the DSP main control chip.

[0013] In the traction motor drive inverter as described above, each phase inverter unit circuit in the three-phase inverter unit circuit is respectively connected to the end of the filter inductor away from the DC input voltage and between the negative voltage of the DC input voltage; each phase inverter unit circuit includes two IGBT units connected in series, and the connection point between the two IGBT units is used as an output end to form an output end of the three-phase inverter unit circuit; the control loop also includes: a driving board for driving each IGBT unit in the three-phase inverter unit circuit;

[0014] The at least one signal processing module includes a driving signal processing module; the driving signal processing module is connected to the driving board and is used to control the conduction and closed-loop states of each IGBT unit through the driving board according to the control signal for each IGBT unit sent by the DSP main control chip.

[0015] In the traction motor drive inverter as described above, the control loop also includes: a current sensor arranged at the output end of the three-phase inverter unit circuit; the at least one signal processing module includes a current signal processing module; the current signal processing module is connected to the current sensor, and is used to transmit the three-phase current at the output end of the three-phase inverter unit circuit detected by the current sensor to the DSP main control chip.

[0016] The traction motor drive inverter as described above further includes: a thermistor and / or a thermal switch, and a fan arranged around the main circuit; the control circuit further includes a fan control circuit connected to the fan; the at least one signal processing module includes a temperature signal processing module connected to the thermistor and / or the thermal switch, and the fan control circuit respectively;

[0017] The temperature signal processing module is used to transmit the temperature information detected by the thermistor and / or thermistor switch to the DSP main control chip;

[0018] The fan control circuit is used to receive the fan control signal sent by the DSP main control chip, and control the fan to start or stop according to the fan control signal.

[0019] The traction motor drive inverter as described above further includes: a switching power supply connected to each circuit and module on the control loop;

[0020] The switching power supply is used for an external DC power supply voltage, and after converting the external DC power supply voltage into a preset power supply voltage, it is provided to the power consumption ends of each circuit and module in the control loop.

[0021] In the traction motor drive inverter as described above, the preset supply voltage includes: at least one of +15V, -15V, 5V, and 3.3V.

[0022] The traction motor drive inverter as described above further includes: a control panel, an input terminal, an output terminal, and at least one of a communication terminal connected to the DSP main control chip;

[0023] Among them, the control panel provides the external input control parameters and reads parameter data to the DSP main control chip through interface touch and / or key operation; the input terminals and output terminals provide the external input control parameters and reads parameter data to the DSP main control chip through a communication interface; the communication terminals provide the external input control parameters and reads parameter data to the DSP main control chip through network communication.

[0024] In the traction motor drive inverter described above, the output end of the three-phase inverter unit circuit is used to provide two different levels of three-phase power supply voltages of 1500V and 750V to the traction motor under the control of the control loop.

[0025] The traction motor drive inverter provided in the embodiment of the present application includes: a main circuit and a control circuit; a basic circuit of the inverter is formed by arranging a charging circuit, a DC filter circuit and a three-phase inverter unit circuit in the main circuit; a DSP main control chip and at least one signal processing module connected to the DSP main control chip are arranged in the control circuit, and each signal processing module is connected to a designated circuit node in the main circuit, so that the node signal at the circuit node is transmitted to the DSP main control chip through these signal processing modules, and / or the corresponding circuit node is controlled according to the control signal for the circuit node sent by the DSP main control chip; thereby, the output end of the three-phase inverter unit circuit provides different levels of three-phase power supply voltage to the traction motor under the control of the control circuit, so that the traction motor drive inverter in the embodiment of the present application is more versatile and suitable for different models of traction motors in the scenario of being used as a test traction motor drive device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] One or more embodiments are exemplarily described by the pictures in the corresponding drawings, and these exemplary descriptions do not constitute limitations on the embodiments.

[0027] Figure 1 is a structural schematic diagram of a traction motor drive inverter provided by an embodiment of the present application;

[0028] Figure 2 It is a schematic diagram of the structure of a traction motor drive inverter provided in another embodiment of the present application. DETAILED DESCRIPTION

[0029] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. However, it will be appreciated by those skilled in the art that in the present application, many technical details are proposed in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is for the convenience of description, and the specific implementation of the present application should not be construed as any limitation, and the various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0030] An embodiment of the present application relates to a traction motor drive inverter, which can be used in the scenario of a test traction motor drive device. The implementation details of the traction motor drive inverter of this embodiment are described in detail below. The following content is only the implementation details provided for easy understanding and is not necessary for implementing this solution.

[0031] like Figure 1 As shown, the traction motor drive inverter includes: a main circuit 1 and a control circuit 2;

[0032] The main circuit 1 includes: a charging circuit 11, a DC filter circuit 12 and a three-phase inverter unit circuit 13 (such as Figure 2 The input end of the charging circuit 11 is used for external DC input voltage (such as Figure 1 and the output end of the three-phase inverter unit circuit 13 serves as the output end of the entire main loop 1.

[0033] The control loop 2 includes: a DSP main control chip 21, at least one signal processing module (such as Figure 1 Each of the charging signal processing module, bus voltage signal processing module, drive signal processing module, current signal processing module, and temperature signal processing module can be regarded as a signal processing module); each signal processing module is connected to a specified circuit node in the main loop 1, and is used to obtain the node signal at the connected circuit node and transmit it to the DSP main control chip 21, and / or control the corresponding circuit node according to the control signal for the connected circuit node sent by the DSP main control chip 21; wherein the control signal for each circuit node is obtained through comprehensive calculation based on the node signal at each circuit node and the control parameters of the external input.

[0034] Among them, in this embodiment, there is no limitation on the number of signal processing modules, and there is no limitation on the position and number of circuit nodes connected to each signal processing module in the main loop 1. It can be one or more. The node signal at the circuit node can be any electrical and / or non-electrical signal at the node (such as current, voltage, temperature and other signals), and the control signal for the circuit node can be any electrical and / or non-electrical signal (such as current, voltage, temperature and other signals) that changes and adjusts the node signal at the node. This embodiment does not limit the specific expression form of these signals and the method of transmitting the signals.

[0035] It should be noted that different circuit nodes have different functional modes of sending and receiving signals: some circuit nodes only provide node signals to the DSP main control chip 21 in a unidirectional manner, some circuit nodes only receive control signals for controlling circuit nodes from the DSP main control chip 21 in a unidirectional manner, and some circuit nodes can provide node signals to the DSP main control chip 21 and receive control signals for controlling circuit nodes from the DSP main control chip 21. This means that the control signals of each circuit node can be obtained by comprehensive calculation based on the node signals at each circuit node (including other circuit nodes other than the current circuit node) and the control parameters input externally. Here, the control parameters input externally can be some control parameters that need to be input from the outside to the DSP main control chip 21, such as parameters corresponding to the working mode and working state indicators of the main circuit 1. Through these control parameters and in combination with the node signals at each key circuit node in the current main circuit 1, the working state to be achieved by the corresponding circuit node can be calculated through the logic algorithm of the DSP main chip, and then the control signals are sent to these circuit nodes, so that under the operation of the control signals, the output end of the three-phase inverter unit circuit 13 meets the requirements of the preset output voltage.

[0036] The output end of the three-phase inverter unit circuit 13 is used to provide different levels of three-phase power supply voltage to the traction motor under the control of the control loop 2. That is, the control loop 2 sends a control signal to each circuit node to control the overall working state of the main loop 1, so that the three-phase inverter unit circuit 13 can provide different levels of three-phase power supply voltage to the traction motor under such control.

[0037] For example, the output end of the three-phase inverter unit circuit 13 can be used to provide two different levels of three-phase power supply voltages of 1500V and 750V to the traction motor under the control of the control loop 2, thereby driving the traction motor at different working voltage levels.

[0038] Compared with the related art, the traction motor drive inverter provided in the embodiment of the present application includes: a main circuit and a control circuit; a basic circuit of the inverter is formed by arranging a charging circuit, a DC filter circuit and an inverter unit circuit in the main circuit; a DSP main control chip and at least one signal processing module connected to the DSP main control chip are arranged in the control circuit, and each signal processing module is connected to a designated circuit node in the main circuit, so that the node signal at the circuit node is transmitted to the DSP main control chip through these signal processing modules, and / or the corresponding circuit node is controlled according to the control signal for the circuit node sent by the DSP main control chip; thereby, the output end of the inverter unit circuit provides different levels of three-phase power supply voltage to the traction motor under the control of the control circuit, so that the traction motor drive inverter in the embodiment of the present application is more versatile and suitable for different models of traction motors in the scenario of being used as a test traction motor drive device.

[0039] Another embodiment of the present application relates to a traction motor drive inverter, which is a supplementary description of the traction motor drive inverter in the above embodiment, including a specific description of at least the following signal processing modules for processing different signal functions, and some new peripheral circuits. In order to conveniently display the connection relationship between the signal lines and power lines between the units and modules in the figure, a power bus and a signal bus are drawn, wherein: all units and modules connected to the power bus can be powered normally, and all units and modules connected to the data bus can exchange data and signals with the units and modules with which they have a communication relationship as required.

[0040] like Figure 2 As shown, in the traction motor drive inverter in this embodiment, the charging circuit 11 may include: a contactor K1, a charging resistor R1 and a charging capacitor C1; the branch formed by the contactor K1 and the charging resistor R1 being connected in parallel is connected in series to the positive branch of the DC input voltage, and the charging capacitor C1 is connected in parallel between the positive voltage and the negative voltage of the DC input voltage; the at least one signal processing module mentioned above may include a charging signal processing module 221; the charging signal processing module 221 is connected to the contactor K1 (K1 is the circuit node connected to the charging signal processing module 221), and is used to control the contactor K1 to act according to the control signal for the contactor K1 sent by the DSP main control chip 21, so that the charging circuit 11 is in a charging state or a non-charging state.

[0041] Specifically, in the charging circuit 11, the charging resistor R1 and the charging capacitor C1 form a charging loop. When the contactor K1 is closed, the charging loop is disconnected, and the charging capacitor C1 is in an uncharged state; when the contactor K1 is disconnected, the charging loop is closed, and the charging capacitor C1 is charged through the charging resistor R1 and is in a charged state. It can be seen that by controlling the contactor K1, the charging circuit 11 can be in a charging state or a non-charging state. In this way, the control signal for the action of the contactor K1 sent by the DSP main control chip 21 controls the action of the contactor K1 to make the charging circuit 11 in a charging state or a non-charging state.

[0042] like Figure 2 As shown, in the traction motor drive inverter in this embodiment, the DC filter module 12 may include: a filter inductor L1, a filter resistor R2 and a DC bus capacitor C2; the filter inductor L1 is connected in series to the positive branch of the DC input voltage; the filter resistor R2 and the DC bus capacitor C2 are respectively connected to the end of the filter inductor L1 away from the DC input voltage, and between the negative voltage of the DC input voltage; the at least one signal processing module mentioned above may include a bus voltage signal processing module 222; the bus voltage signal processing module 222 is connected to the DC bus capacitor C2 (C2 is the circuit node connected to the bus voltage signal processing module 222), and is used to detect the DC bus voltage at both ends of the DC bus capacitor C2 and transmit it to the DSP main control chip 21.

[0043] Specifically, in the DC filter module 12, the filter inductor L1 and the filter resistor R2 form a filter circuit, which is used to filter out the noise voltage and ensure that the voltage at both ends of the DC bus capacitor C2 is purer. The DC bus voltage at both ends of the DC bus capacitor C2 is an important signal parameter in the converter circuit. Real-time monitoring of the DC bus voltage can be used for the logic calculation of the DSP main control chip 21 to generate a control signal to control the node signal at the circuit node, and can also be used for overvoltage protection control in the main circuit 1. The bus voltage signal processing module 222 is connected to the DC bus capacitor C2, and can effectively detect the DC bus voltage at both ends of the DC bus capacitor C2 and transmit it to the DSP main control chip 21, so that the DSP main control chip 21 can perform logic calculations and overvoltage protection operations based on the DC bus voltage.

[0044] like Figure 2As shown, in the traction motor drive inverter in this embodiment, each phase inverter unit circuit in the three-phase inverter unit circuit 13 (such as the U-phase inverter unit circuit, the V-phase inverter unit circuit, and the W-phase inverter unit circuit) is respectively connected to the end of the filter inductor L1 away from the DC input voltage and between the negative voltage of the DC input voltage; each phase inverter unit circuit includes two IGBT units 131 connected in series, and the connection point between the two IGBT units 131 is used as an output end to form an output end of the three-phase inverter unit circuit 13 (such as the output end U1 in the U-phase inverter unit circuit, the output end U2 in the V-phase inverter unit circuit, and the output end U3 in the V-phase inverter unit circuit). Output terminal V1, output terminal W1 of W-phase inverter unit circuit); the control loop 2 may also include: a driving board 23 for driving each IGBT unit 131 in the three-phase inverter unit circuit 13; the above-mentioned at least one signal processing module may include a driving signal processing module 223; the driving signal processing module 223 is connected to the driving board 23, and is used to control the conduction state of each IGBT unit 131 (IGBT unit 131 is a circuit node connected to the driving signal processing module 223)) through the driving board 23 according to the control signal for each IGBT unit 131 sent by the DSP main control chip 21.

[0045] Specifically, for each phase inverter unit circuit, a driving board 23 can be set to connect with the control end (gate of IGBT) of two IGBT units 131 in the phase inverter unit circuit. The DSP main control chip 21 sends a control signal for each IGBT unit 131 to the driving signal processing module 223, and the driving signal processing module 223 converts the control signal from a digital signal into an optical fiber signal, and transmits it to the driving board through the optical fiber, so as to control the on and off state of each IGBT unit 131 through the driving board 23, thereby generating a pulse width modulation (PWM) signal.

[0046] like Figure 2 As shown, in the traction motor drive inverter in this embodiment, the control loop 2 may also include: a current sensor 24 arranged at the output end (i.e., U1, V1, W1 end) of the three-phase inverter unit circuit 13; the above-mentioned at least one signal processing module may include a current signal processing module 224; the current signal processing module 224 is connected to the current sensor 24 (the output end of the three-phase inverter unit circuit 13 is the circuit node connected to the current signal processing module 224), and is used to transmit the three-phase current of the output end of the three-phase inverter unit circuit 13 detected by the current sensor 24 to the DSP main control chip 21.

[0047] Specifically, the three-phase current is collected by the current sensor 24 arranged at the output end (i.e., U1, V1, and W1 ends) of the three-phase inverter unit circuit 13, and transmitted to the DSP main control chip 21 through the current signal processing module 224. This can help the DSP main control chip 21 to perform logical calculations to generate control signals for controlling circuit nodes, such as generating control signals to the drive signal processing module 223, and then controlling the conduction, closing state (duty cycle), etc. of each IGBT unit 131 through the drive board 23, or it can also generate control signals to other circuit nodes to perform current limiting protection when the three-phase current is too large.

[0048] like Figure 2 As shown, the traction motor drive inverter in this embodiment may also include: a thermistor and / or a thermal switch, and a fan arranged around the main circuit 1; the control circuit 2 may also include a fan control circuit 25 connected to the fan; the at least one signal processing module mentioned above may include a temperature signal processing module 225 connected to the thermistor and / or thermistor and the fan control circuit 25 respectively; the temperature signal processing module 225 is used to transmit the temperature information detected by the thermistor and / or thermistor to the DSP main control chip 21; the fan control circuit 25 is used to receive the fan control signal sent by the DSP main control chip 21, and control the fan to start or stop according to the fan control signal.

[0049] Specifically, thermistors and / or thermal switches arranged around the main loop 1 can effectively detect the temperature information of the environment in which the main loop 1 is located, and the temperature information is fed back to the DSP main control chip 21 through the temperature signal processing module 225. The DSP main control chip 21 combines the temperature information and other node signals to perform logical calculations, generates a fan control signal for controlling the fan action, and sends the fan control signal to the fan control circuit 25. The fan control circuit 25 controls the fan to start or stop according to the fan control signal to ensure that the main loop 1 operates at an appropriate temperature.

[0050] like Figure 2 As shown, the traction motor drive inverter in this embodiment may also include: a switching power supply 3 connected to each circuit and module on the control loop 1; the switching power supply 3 is used for an external DC power supply voltage, and after converting the external DC power supply voltage into a preset power supply voltage, it is provided to the power consumption end of each circuit and module on the control loop 1.

[0051] Specifically, the operating voltages of various circuits and modules on the control loop 1 are not the same. Therefore, a switching power supply 3 (DC1+, DC1- in the figure) is required to convert the external DC power supply voltage into a preset power supply voltage suitable for each circuit and module before power can be supplied to the corresponding circuits and modules to ensure that they can work normally.

[0052] The preset supply voltage may include at least one of +15V, -15V, 5V and 3.3V.

[0053] like Figure 2 As shown, in the traction motor drive inverter in this embodiment, it can also include: a control panel connected to the DSP main control chip 21, at least one of input terminals, output terminals, and communication terminals;

[0054] Among them, the control panel provides external input control parameters and reads parameter data to the DSP main control chip through interface touch and / or key operation; the input terminal and the output terminal provide external input control parameters and reads parameter data to the DSP main control chip 21 through a wired communication interface; the communication terminal provides external input control parameters and reads parameter data to the DSP main control chip 21 through network communication.

[0055] In this embodiment, multiple data exchange modes are provided to satisfy the information exchange between the DSP main control chip 21 and the outside. The contents of these information exchanges are concentrated on the control parameters of the above-mentioned external input and the reading of specified parameter data from the main loop 1 and / or the control loop 2 to facilitate effective control of the main loop 1 and / or the control loop 2.

[0056] In addition, a memory reset switch connected to the DSP main control chip 21 can be provided on the control loop 2 to reset the memory connected to the DSP main control chip 21 to ensure that the control loop effectively stores key data in the control process.

[0057] In addition, a relay output terminal connected to the DSP main control chip 21 can be set on the control loop 2 to reflect the working status of the main loop, such as running, stopping, fault, frequency arrival, etc. These states can be applied to programmable logic controllers PLCs, indicator lights, instrument lights, etc.

[0058] It is worth mentioning that all modules involved in this embodiment are logic modules. In practical applications, a logic unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. In addition, in order to highlight the innovative part of this application, this embodiment does not introduce units that are not closely related to solving the technical problems proposed by this application, but this does not mean that there are no other units in this embodiment.

[0059] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. A traction motor drive inverter, characterized in that: include: Main circuit and control circuit; The main circuit includes: a charging circuit, a DC filter circuit and a three-phase inverter unit circuit connected in sequence from the input end to the output end; the input end of the charging circuit is used for externally connecting a DC input voltage; The control loop comprises: a DSP main control chip, and at least one signal processing module connected to the DSP main control chip; each of the signal processing modules is connected to a designated circuit node in the main loop, and is used to obtain a node signal at the connected circuit node and transmit it to the DSP main control chip, and / or control the corresponding circuit node according to a control signal for the connected circuit node sent by the DSP main control chip; wherein the control signal for each circuit node is obtained through comprehensive calculation based on the node signal at each circuit node and an externally input control parameter; The output end of the three-phase inverter unit circuit is used to provide three-phase power supply voltages of different levels to the traction motor under the control of the control loop.

2. The traction motor drive inverter according to claim 1, characterized in that: The charging circuit comprises: a contactor, a charging resistor and a charging capacitor; the branch formed by the contactor and the charging resistor being connected in parallel is connected in series to the positive branch of the DC input voltage, and the charging capacitor is connected in parallel between the positive voltage and the negative voltage of the DC input voltage; The at least one signal processing module includes a charging signal processing module; the charging signal processing module is connected to the contactor and is used to control the contactor action according to the control signal for the contactor action sent by the DSP main control chip to put the charging circuit in a charging state or a non-charging state.

3. The traction motor drive inverter according to claim 1, characterized in that: The DC filter module includes: a filter inductor, a filter resistor and a DC bus capacitor; The filter inductor is connected in series to the positive branch of the DC input voltage; the filter resistor and the DC bus capacitor are respectively connected to one end of the filter inductor away from the DC input voltage and between the negative voltage of the DC input voltage; The at least one signal processing module includes a bus voltage signal processing module; the bus voltage signal processing module is connected to the DC bus capacitor and is used to detect the DC bus voltage at both ends of the DC bus capacitor and transmit it to the DSP main control chip.

4. The traction motor drive inverter according to claim 3, characterized in that: Each phase inverter unit circuit in the three-phase inverter unit circuit is respectively connected to one end of the filter inductor away from the DC input voltage and between the negative voltage of the DC input voltage; each phase inverter unit circuit includes two IGBT units connected in series, and the connection point between the two IGBT units is used as an output end to form an output end of the three-phase inverter unit circuit; the control loop also includes: a driving board for driving each IGBT unit in the three-phase inverter unit circuit; The at least one signal processing module includes a driving signal processing module; the driving signal processing module is connected to the driving board and is used to control the on / off state of each IGBT unit through the driving board according to the control signal for each IGBT unit sent by the DSP main control chip.

5. The traction motor drive inverter according to claim 1, characterized in that: The control loop also includes: a current sensor arranged at the output end of the three-phase inverter unit circuit; the at least one signal processing module includes a current signal processing module; the current signal processing module is connected to the current sensor, and is used to transmit the three-phase current at the output end of the three-phase inverter unit circuit detected by the current sensor to the DSP main control chip.

6. The traction motor drive inverter according to claim 1, characterized in that: Also includes: Thermistors and / or thermal switches, and fans are arranged around the main circuit; the control circuit also includes a fan control circuit connected to the fan; the at least one signal processing module includes a temperature signal processing module connected to the thermistor and / or thermal switch, and the fan control circuit respectively; The temperature signal processing module is used to transmit the temperature information detected by the thermistor and / or thermistor switch to the DSP main control chip; The fan control circuit is used to receive the fan control signal sent by the DSP main control chip, and control the fan to start or stop according to the fan control signal.

7. The traction motor drive inverter according to claim 1, characterized in that: Also includes: A switching power supply connected to each circuit and module on the control loop; The switching power supply is used for an external DC power supply voltage, and after converting the external DC power supply voltage into a preset power supply voltage, it is provided to the power consumption ends of each circuit and module in the control loop.

8. The traction motor drive inverter according to claim 7, characterized in that: The preset supply voltage includes at least one of +15V, -15V, 5V, and 3.3V.

9. The traction motor drive inverter according to claim 1, characterized in that: Also includes: At least one of a control panel, an input terminal, an output terminal, and a communication terminal connected to the DSP main control chip; Among them, the control panel provides the external input control parameters and reads parameter data to the DSP main control chip through interface touch and / or key operation; the input terminals and output terminals provide the external input control parameters and reads parameter data to the DSP main control chip through a communication interface; the communication terminals provide the external input control parameters and reads parameter data to the DSP main control chip through network communication.

10. The traction motor drive inverter according to claim 1, characterized in that: The output end of the three-phase inverter unit circuit is used to provide two different levels of three-phase power supply voltages of 1500V and 750V to the traction motor under the control of the control loop.

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