Passive network load test system of power module

Abstract

The invention discloses a passive network load test system for a power module. The passive network load test system comprises a test board, a single-chip microcomputer, a driving circuit board, a computer, a serial communication interface, a power module to be tested, a voltage and current detection module and a reactive load network, the single-chip microcomputer and the drive circuit board are installed in the test bench. The single-chip microcomputer is connected with the driving circuit board through a signal transmission line and is connected with a computer through a serial communication interface. A to-be-tested power module is installed on the test bench, is connected with the driving circuit board through a signal transmission line, and is connected with the reactive load network through a wiring terminal and a DC bus. A voltage and current detection module is arranged between the to-be-detected power module and the reactive load network. According to the system, a reactive load network can be used for simulating an actual load without using a motor, various dynamic parameters of the power module are tested, a test result is analyzed and processed, and reliability verification of power modules of different specifications under different working conditions is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of dynamic testing of power modules, and in particular relates to a passive network load testing system for a power module. Background Art

[0002] IGBT power module is the fastest growing and most widely used power semiconductor device at home and abroad. Its excellent high-speed switching performance makes it widely used in the new generation of high-quality weapons and equipment. With the continuous emergence of various new weapons, missile launchers, radar power supplies, electromagnetic guns, laser weapons, electromagnetic catapults and other high-energy weapons require large-capacity power supply, and the demand for IGBT has increased dramatically. The performance of the power module directly determines whether the missile weapon system can operate reliably and stably.

[0003] At present, the test system is mainly used to test the dynamic and static parameters of the power module, and its test results cannot fully reflect the load and thermal design problems of the power module in actual use. The application of power modules is mainly concentrated in motor control, which usually adopts a two-level voltage source inverter topology. The motor control working conditions are complex and have a great impact on the stress of the power module. Different motors need to be selected for different application occasions for matching design, and the required environment is harsh. Summary of the invention

[0004] The technology of the present invention solves the problem: overcomes the shortcomings of the prior art and provides a passive network load testing system for a power module, which can simulate the actual load by using a reactive load network instead of a motor, test various dynamic parameters of the power module, and analyze and process the test results, so as to realize reliability verification of power modules of different specifications under different working conditions.

[0005] In order to solve the above technical problems, the present invention discloses a passive network load test system for a power module, comprising: a test bench, a single-chip microcomputer, a driving circuit board, a computer, a serial communication interface, a power module to be tested, a voltage and current detection module and a reactive load network; wherein the single-chip microcomputer and the driving circuit board are installed in the test bench; the single-chip microcomputer is connected to the driving circuit board through a signal transmission line, and is connected to the computer through the serial communication interface; the power module to be tested is installed on the test bench, the power module to be tested is connected to the driving circuit board through the signal transmission line, and the power module to be tested is connected to the reactive load network through a wiring terminal and a DC bus; a voltage and current detection module is arranged between the power module to be tested and the reactive load network.

[0006] In the passive network load test system of the above power module,

[0007] The voltage and current detection module is used to detect the temperature, phase current and phase voltage of the power module to be tested, and collect the detection data; perform analog-to-digital conversion on the detection data to obtain a digital signal; and send the digital signal to the single-chip microcomputer;

[0008] The single chip microcomputer is used to filter and average the digital signals sent by the voltage and current detection module, and send the processed data to the computer through the serial communication interface and to the driver circuit board through the signal transmission line;

[0009] A computer is used to analyze the processed data sent by the single-chip microcomputer, obtain the current temperature, phase current and phase voltage of the power module to be tested, and display and store them;

[0010] A driving circuit board is used to drive the power module to be tested according to the processed data sent by the single-chip microcomputer and the preset expected phase current, so that the power module to be tested generates a phase current consistent with the expected phase current;

[0011] Reactive load network, used to provide load for the power module under test.

[0012] In the passive network load test system of the power module, the voltage and current detection module includes: a Hall current sensor, a voltage sensor and a temperature sensor, which are respectively used to measure the phase current, phase voltage and temperature of the power module to be tested.

[0013] In the passive network load test system of the above-mentioned power module, the reactive load network uses three star-connected three-phase inductors as the load of the power module to be tested, so that when the power module to be tested modulates the phase voltage of corresponding frequency and amplitude, a phase current of corresponding magnitude and frequency is generated on the three-phase inductor.

[0014] The passive network load test system for the power module further includes: a heat sink; wherein the heat sink is installed in the test bench and located below the power module to be tested, and is used to achieve heat dissipation of the power module to be tested.

[0015] The passive network load test system of the power module mentioned above also includes: an input and output device, which is installed on the test bench and connected to the computer through a signal transmission line.

[0016] In the passive network load test system of the power module, the input and output devices include: a mouse, a keyboard and a display screen.

[0017] In the passive network load test system of the above power module, the system working process is as follows:

[0018] The test mode and test parameters are set through input and output devices; wherein the test mode includes: permanent magnet synchronous motor vector test mode, asynchronous motor VF test mode and reactive power test mode; the test parameters include: switching frequency, load frequency, load current and DC input voltage;

[0019] The computer sends the received test mode and test parameters to the single chip microcomputer;

[0020] The single-chip microcomputer generates a corresponding control signal according to the received test mode and test parameters; wherein, if the test mode is a permanent magnet synchronous motor vector test mode, the single-chip microcomputer generates an SVPWM control signal based on a speed and current dual closed loop by adjusting the settings of the speed and the maximum value of the phase current, and inputs the control SVPWM signal to the drive circuit board; if the test mode is an asynchronous motor VF test mode, the single-chip microcomputer generates a VF curve required by the VF test mode by adjusting the frequency and size settings of the phase voltage, generates a corresponding SPWM1 control signal, and inputs the SPWM1 control signal to the drive circuit board; if the test mode is a reactive test mode, the single-chip microcomputer generates a VF curve required by the reactive test mode by adjusting the frequency and size settings of the phase voltage, generates a corresponding SPWM2 control signal, and inputs the SPWM2 control signal to the drive circuit board;

[0021] After receiving the control signal sent by the single chip microcomputer, the driving circuit outputs it to the power module to be tested after driving and amplifying, and drives the power module to be tested so that the power module to be tested works under the conditions required by the test mode;

[0022] After receiving the phase voltage modulated by the power module to be tested, the reactive load network automatically modulates the three-phase sinusoidal current;

[0023] The phase voltage, phase current and operating temperature of the power module to be tested are collected through the voltage and current detection module, and the collected data are converted into digital form to obtain a digital signal; the digital signal is sent to the single chip microcomputer;

[0024] The computer processes and analyzes the digital signal and displays the analysis results.

[0025] The present invention has the following advantages:

[0026] (1) The present invention discloses a passive network load test system for a power module, which can simulate various dynamic parameters of the power module, especially the temperature change in dynamic operation, through a reactive load network without using a motor. The state data of the power module is obtained by analyzing the test results, and the data is stored in the memory of a computer, and analysis and processing opinions are obtained at the same time.

[0027] (2) The present invention discloses a passive network load test system for a power module, which can verify whether the load condition of the power module matches the thermal design through a reactive load network.

[0028] (3) The present invention discloses a passive network load test system for a power module. By utilizing a reactive load network and a control algorithm, the effective value of the phase current of the power module can achieve the effect of simulating the working state of a motor, thereby realizing application verification of the power module in different occasions, solving the problem of load verification of the power module, and then evaluating the reliability of the power module, and further optimizing the design of the power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a block diagram of a passive network load test system for a power module in an embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of the installation of a passive network load test system for a power module in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Reference Figures 1-2 In this embodiment, the passive network load test system of the power module includes: a test bench 1, a single-chip microcomputer 2, a driving circuit board 3, a computer 5, a serial communication interface 6, a power module to be tested 7, a voltage and current detection module 8 and a reactive load network 10. Among them, the single-chip microcomputer 2 and the driving circuit board 3 are installed in the test bench 1; the single-chip microcomputer 2 is connected to the driving circuit board 3 through a signal transmission line, and is connected to the computer 5 through the serial communication interface 6; the power module to be tested 7 is installed on the test bench 1, the power module to be tested 7 is connected to the driving circuit board 3 through a signal transmission line, and the power module to be tested 7 is connected to the reactive load network 10 through a wiring terminal and a DC bus; a voltage and current detection module 8 is provided between the power module to be tested 7 and the reactive load network 10.

[0033] In this embodiment, the voltage and current detection module 8 is used to detect the temperature, phase current and phase voltage of the power module 7 to be tested, and collect the detection data; perform analog-to-digital conversion on the detection data to obtain a digital signal; and send the digital signal to the single-chip microcomputer 2. The single-chip microcomputer 2 is used to filter and average the digital signal sent by the voltage and current detection module 8, and send the processed data to the computer 5 through the serial communication interface 6 and to the drive circuit board 3 through the signal transmission line. The computer 5 is used to analyze the processed data sent by the single-chip microcomputer 2, obtain the current temperature, phase current and phase voltage of the power module 7 to be tested, and display and store them. The drive circuit board 3 is used to drive the power module 7 to be tested according to the processed data sent by the single-chip microcomputer 2 and the preset expected phase current, so that the power module 7 to be tested generates a phase current consistent with the expected phase current. The reactive load network 10 is used to provide a load for the power module 7 to be tested.

[0034] In this embodiment, the passive network load test system of the power module may further include: a heat sink 9 and an input / output device 4. The heat sink 9 is installed in the test bench 1 and is located below the power module 7 to be tested, and is used to achieve heat dissipation of the power module 7 to be tested. The input / output device 4 is installed on the test bench 1 and is connected to the computer 5 through a signal transmission line. The input / output device 4 includes but is not limited to: a mouse, a keyboard, and a display screen, etc.; the user can adjust the test mode and test parameters based on the mouse and keyboard (which can be adjusted through menu-based operations), and the current working status of the power module to be tested can be displayed on the display screen, including the working voltage, working frequency, working current, etc.

[0035] In this embodiment, the test bench 1 is a semi-open box structure, the single chip computer 2 and the driving circuit board 3 are installed in the box, the mouse, keyboard and display screen are installed outside the box, and the radiator is installed in the semi-open part of the box. The radiator 9 is made of aluminum, and bolt holes are left on the radiator for installing different power modules to be tested.

[0036] In this embodiment, the voltage and current detection module 8 mainly includes: a Hall current sensor, a voltage sensor and a temperature sensor, which are respectively used to measure the phase current, phase voltage and temperature of the power module 7 to be tested.

[0037] In this embodiment, the reactive load network 10 uses three star-connected three-phase inductors (three high-power air-core inductors without magnetic saturation) as the load of the power module 7 to be tested, so that when the power module 7 to be tested modulates a phase voltage of corresponding frequency and amplitude, a phase current of corresponding magnitude and frequency is generated on the three-phase inductor.

[0038] In this embodiment, the system workflow is as follows:

[0039] The test mode and test parameters are set through the input and output device 4. The test modes mainly include: permanent magnet synchronous motor vector test mode, asynchronous motor VF test mode and reactive power test mode; the test parameters mainly include: switching frequency, load frequency, load current and DC input voltage.

[0040] The computer 5 sends the received test mode and test parameters to the single chip microcomputer 2 .

[0041] The single-chip computer 2 generates a corresponding control signal according to the received test mode and test parameters. If the test mode is a permanent magnet synchronous motor vector test mode, the single-chip computer 2 generates a SVPWM control signal based on a double closed loop of speed and current by adjusting the settings of the speed and the maximum value of the phase current, and inputs the control SVPWM signal to the drive circuit board 3; if the test mode is an asynchronous motor VF test mode, the single-chip computer 2 generates a VF curve required by the VF test mode by adjusting the frequency and size settings of the phase voltage, and generates a corresponding SPWM1 control signal, and inputs the SPWM1 control signal to the drive circuit board 3; if the test mode is a reactive test mode, the single-chip computer 2 generates a VF curve required by the reactive test mode by adjusting the frequency and size settings of the phase voltage, and generates a corresponding SPWM2 control signal, and inputs the SPWM2 control signal to the drive circuit board 3.

[0042] After receiving the control signal sent by the single chip computer 2, the driving circuit 3 outputs it to the power module to be tested 7 after driving and amplifying, and drives the power module to be tested 7 so that the power module to be tested 7 works under the conditions required by the test mode.

[0043] After receiving the phase voltage modulated by the power module 7 to be tested, the reactive load network 10 automatically modulates a three-phase sinusoidal current.

[0044] The voltage and current detection module 8 collects the phase voltage, phase current and operating temperature of the power module 7 to be tested, performs analog-to-digital conversion on the collected data to obtain a digital signal; and sends the digital signal to the single-chip microcomputer 2.

[0045] The computer 5 processes and analyzes the digital signal and displays the analysis result. The computer can form analysis and processing opinions by processing and analyzing the digital signal to evaluate the reliability of the power module to be tested. For example, the loss of the power module to be tested can be calculated as:

[0046] P LOSS =IVT

[0047] Among them, P LOSS Indicates, I represents the phase current, V represents the phase voltage, and T represents the overlapping time of phase current and phase voltage.

[0048] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0049] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A passive network load test system for a power module, characterized in that: include: A test bench (1), a single-chip microcomputer (2), a driving circuit board (3), a computer (5), a serial communication interface (6), a power module to be tested (7), a voltage and current detection module (8) and a reactive load network (10); wherein the single-chip microcomputer (2) and the driving circuit board (3) are installed in the test bench (1); the single-chip microcomputer (2) is connected to the driving circuit board (3) via a signal transmission line, and is connected to the computer (5) via the serial communication interface (6); the power module to be tested (7) is installed on the test bench (1), the power module to be tested (7) is connected to the driving circuit board (3) via a signal transmission line, and the power module to be tested (7) is connected to the reactive load network (10) via a wiring terminal and a DC bus; and a voltage and current detection module (8) is provided between the power module to be tested (7) and the reactive load network (10).

2. The passive network load test system for power module according to claim 1, characterized in that: The voltage and current detection module (8) is used to detect the temperature, phase current and phase voltage of the power module (7) to be tested, and collect the detection data; perform analog-to-digital conversion on the detection data to obtain a digital signal; and send the digital signal to the single-chip microcomputer (2); The single chip computer (2) is used to filter and average the digital signal sent by the voltage and current detection module (8), and send the processed data to the computer (5) through the serial communication interface (6) and to the driving circuit board (3) through the signal transmission line; The computer (5) is used to analyze the processed data sent by the single chip computer (2), obtain the current temperature, phase current and phase voltage of the power module (7) to be tested, and display and store the data; A driving circuit board (3) is used to drive the power module to be tested (7) according to the processed data sent by the single chip computer (2) in combination with a preset expected phase current, so that the power module to be tested (7) generates a phase current consistent with the expected phase current; The reactive load network (10) is used to provide a load for the power module (7) to be tested.

3. The passive network load test system for power module according to claim 2, characterized in that: The voltage and current detection module (8) comprises: a Hall current sensor, a voltage sensor and a temperature sensor, which are respectively used to measure the phase current, phase voltage and temperature of the power module (7) to be tested.

4. The passive network load test system for power module according to claim 2, characterized in that: The reactive load network (10) uses three star-connected three-phase inductors as loads of the power module (7) to be tested, so that when the power module (7) to be tested modulates a phase voltage of corresponding frequency and amplitude, a phase current of corresponding magnitude and frequency is generated on the three-phase inductors.

5. The passive network load test system for power module according to claim 1, characterized in that: It also comprises: a heat sink (9); wherein the heat sink (9) is installed in the test bench (1) and is located below the power module to be tested (7), and is used to achieve heat dissipation for the power module to be tested (7).

6. The passive network load test system for power module according to claim 1, characterized in that: It also includes: an input and output device (4); wherein the device is installed on the test bench (1) and connected to the computer (5) via a signal transmission line.

7. The passive network load test system for power module according to claim 6, characterized in that: Input and output devices (4), including: a mouse, a keyboard and a display screen.

8. The passive network load test system for power module according to claim 6, characterized in that: The system workflow is as follows: The test mode and test parameters are set through the input and output device (4); wherein the test mode includes: permanent magnet synchronous motor vector test mode, asynchronous motor VF test mode and reactive power test mode; the test parameters include: switching frequency, load frequency, load current and DC input voltage; The computer (5) sends the received test mode and test parameters to the single chip computer (2); The single-chip microcomputer (2) generates a corresponding control signal according to the received test mode and test parameters; wherein, if the test mode is a permanent magnet synchronous motor vector test mode, the single-chip microcomputer (2) generates an SVPWM control signal based on a double closed loop of speed and current by adjusting the settings of the speed and the maximum value of the phase current, and inputs the control SVPWM signal to a drive circuit board (3); if the test mode is an asynchronous motor VF test mode, the single-chip microcomputer (2) generates a VF curve required by the VF test mode by adjusting the frequency and size settings of the phase voltage, generates a corresponding SPWM1 control signal, and inputs the SPWM1 control signal to the drive circuit board (3); if the test mode is a reactive power test mode, the single-chip microcomputer (2) generates a VF curve required by the reactive power test mode by adjusting the frequency and size settings of the phase voltage, generates a corresponding SPWM2 control signal, and inputs the SPWM2 control signal to the drive circuit board (3); After receiving the control signal sent by the single chip computer (2), the driving circuit (3) outputs the control signal to the power module to be tested (7) after driving and amplifying, and drives the power module to be tested (7) so that the power module to be tested (7) works under the conditions required by the test mode; After receiving the phase voltage modulated by the power module to be tested (7), the reactive load network (10) automatically modulates a three-phase sinusoidal current; The phase voltage, phase current and operating temperature of the power module (7) to be tested are collected by a voltage and current detection module (8), analog-to-digital conversion is performed on the collected data to obtain a digital signal; and the digital signal is sent to a single chip microcomputer (2); The computer (5) processes and analyzes the digital signal and displays the analysis result.

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