A method, device, equipment and storage medium for simulating conducted interference of a converter

Abstract

The present invention discloses a method, device, equipment and storage medium for simulating the conducted interference of a converter, in the field of circuit simulation technology. The method comprises: obtaining a converter conducted interference simulation circuit; utilizing a switch control module to obtain and output corresponding control signals to each switch device on each bridge arm in a first converter module; utilizing a rising and falling edge processing module to perform rising edge and falling edge processing on the voltage monitoring signal and the current monitoring signal of each bridge arm in each first converter module, respectively, to obtain a voltage processing signal and a current processing signal; utilizing the voltage processing signal and the current processing signal as excitations for the voltage source and the current source on each bridge arm in a second converter module, utilizing a high-frequency circuit to obtain simulation results corresponding to a load control instruction; the present invention establishes an ideal circuit and a high-frequency circuit respectively in the same simulation circuit, thereby solving the problem of incompatibility between the high-frequency circuit and the low-frequency circuit, and realizing high-precision simulation of the conducted interference of the converter.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit simulation, and in particular to a method, device, equipment and computer-readable storage medium for simulating conducted interference of a converter. Background Art

[0002] Currently, the voltage change rate (du / dt) and current change rate (di / dt) generated by the switching devices in converters can be converted into common-mode and differential-mode noise and transmitted into the circuit, affecting the normal operation of sensitive components in the circuit, reducing their accuracy and reliability, and even causing irreversible damage. This makes it extremely important to suppress the conducted interference of converters in circuits. Circuit design for suppressing conducted interference in converters requires the use of high-precision conducted interference simulation data.

[0003] Therefore, how to conveniently and accurately simulate the conducted interference of the converter, achieve high-precision simulation of the conducted interference, and facilitate subsequent conducted interference suppression analysis is an issue that urgently needs to be solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a method, device, equipment and computer-readable storage medium for simulating the conducted interference of a converter, so as to conveniently and accurately simulate the conducted interference of the converter, realize high-precision simulation of the conducted interference, and facilitate subsequent suppression analysis of the conducted interference.

[0005] To solve the above technical problems, the present invention provides a method for simulating conducted interference of a converter, comprising:

[0006] Obtain a converter conducted interference simulation circuit; wherein the converter conducted interference simulation circuit includes an ideal circuit, a rising and falling edge processing module, and a high-frequency circuit; the ideal circuit includes a simulated power supply, a first simulated cable, a first converter module, a first simulated load, and a switch control module; the high-frequency circuit includes a second simulated cable, a second converter module, and a second simulated load;

[0007] Using the switch control module, according to the obtained load control instruction, to obtain and output corresponding control signals to each switch device on each bridge arm in the first converter module, so as to control the on and off of the switch device;

[0008] Utilizing the rising and falling edge processing module, performing rising edge and falling edge processing on the voltage monitoring signal and the current monitoring signal of each bridge arm in each of the first converter modules, respectively, to obtain a voltage processing signal and a current processing signal; wherein, when the voltage monitoring signal is the voltage signal of the upper arm switching device, the current monitoring signal is the current signal of the lower arm switching device; and when the voltage monitoring signal is the voltage signal of the lower arm switching device, the current monitoring signal is the current signal of the upper arm switching device;

[0009] The voltage processing signal and the current processing signal are used as excitations for the voltage source and the current source on each bridge arm in the second converter module, and the high-frequency circuit is used to obtain a simulation result corresponding to the load control instruction.

[0010] In some embodiments, the using the switch control module to obtain and output corresponding control signals to the switch devices on each bridge arm of the first converter module according to the obtained load control instruction includes:

[0011] The switch control module is utilized to obtain and output corresponding control signals to each of the switch devices according to the obtained load control instruction and the feedback signal of the first simulated load.

[0012] In some embodiments, using the rising and falling edge processing module to perform rising edge and falling edge processing on the voltage monitoring signal and the current monitoring signal of each bridge arm in each first converter module to obtain the voltage processing signal and the current processing signal includes:

[0013] According to a preset voltage change rate, the voltage monitoring signal of each bridge arm in each first converter module is processed at the rising edge and the falling edge to obtain the voltage processing signal;

[0014] According to a preset current change rate, the current monitoring signal of each bridge arm in each first converter module is processed at the rising edge and the falling edge to obtain the current processing signal.

[0015] In some embodiments, the preset voltage change rate and the preset current change rate are obtained through double pulse test results corresponding to the switching device.

[0016] In some embodiments, the first simulated load and the second simulated load are both motor models, and the load control instruction includes a speed instruction and / or a torque instruction.

[0017] In some embodiments, both the first simulated load and the second simulated load are motor models obtained by motor behavior modeling based on vector matching.

[0018] In some embodiments, the switching device is an IGBT model.

[0019] In some embodiments, the ideal circuit further includes a first LISN module, and the high-frequency circuit further includes a second LISN module.

[0020] In some embodiments, the switch control module is a PWM control module, which is used to obtain and output corresponding PWM signals to each switch device on each bridge arm in the first converter module according to the load control instruction.

[0021] In some embodiments, the first converter module is an inverter circuit, a rectifier circuit, a boost converter circuit, or a buck converter circuit.

[0022] In some embodiments, the first converter module is a three-phase inverter circuit, and the first converter module includes a first switching device, a second switching device, a third switching device, a fourth switching device, a fifth switching device, a sixth switching device, three voltage collection devices, and three current collection devices;

[0023] Wherein, the first ends of the first switching device, the second switching device and the third switching device are all connected to the positive electrode of the simulated power supply through the first simulation cable, and the simulated power supply is a DC power supply; the second ends of the fourth switching device, the fifth switching device and the sixth switching device are all connected to the negative electrode of the simulated power supply through the first simulation cable via one of the current acquisition devices corresponding to each of them; the second end of the first switching device is connected to the first end of the fourth switching device, and the common end thereof serves as the first AC output end of the first converter module and is connected to the first input end of the first simulated load through the first simulation cable; the second end of the second switching device is connected to the first end of the fifth switching device, and the common end thereof serves as the second AC output end of the first converter module and is connected to the second input end of the first simulated load through the first simulation cable; the second end of the third switching device is connected to the first end of the sixth switching device, and the common end thereof serves as the third AC output end of the first converter module and is connected to the third input end of the first simulated load through the first simulation cable;

[0024] The two ends of the first switching device, the second switching device and the third switching device are respectively connected in parallel with a corresponding voltage acquisition device; the output ends of the three voltage acquisition devices are respectively connected to the three voltage input ends of the rising and falling edge processing module, for transmitting the voltage monitoring signals of the three bridge arms in the first converter module; the output ends of the three current acquisition devices are respectively connected to the three current input ends of the rising and falling edge processing module, for transmitting the current monitoring signals of the three bridge arms in the first converter module; the control ends of the first to sixth switching devices are respectively connected to the six control signal output ends of the switch control module.

[0025] In some embodiments, the second converter module includes a first voltage source, a second voltage source, a third voltage source, a first current source, a second current source, a third current source, three first inductors, three second inductors, three third inductors, and three capacitors;

[0026] The three voltage output terminals of the rising and falling edge processing module are respectively connected to the excitation input terminals of the first voltage source, the second voltage source, and the third voltage source, and the three current output terminals of the rising and falling edge processing module are respectively connected to the excitation input terminals of the first current source, the second current source, and the third current source;

[0027] The first ends of the first voltage source, the second voltage source, and the third voltage source are each connected to the LISN module of the second converter module through a corresponding first inductor device through the second simulation cable; the second ends of the first voltage source, the second voltage source, and the third voltage source are respectively connected to the first end of a corresponding capacitor device, and the second ends of the three capacitor devices are all grounded; the first ends of the first current source, the second current source, and the third current source are each connected to the first end of a capacitor device through a corresponding second inductor device, and the common end of the first ends of the three capacitor devices connected to the three second inductors serves as the three AC output ends of the second converter module and is connected to the three input ends of the second simulation load through the second simulation cable;

[0028] The second ends of the first current source, the second current source and the third current source are connected to the LISN module of the second converter module through the second simulation cable via a corresponding third inductor device.

[0029] The present invention also provides a device for simulating conducted interference of a converter, comprising:

[0030] An acquisition unit is configured to acquire a converter conducted interference simulation circuit; wherein the converter conducted interference simulation circuit includes an ideal circuit, a rising and falling edge processing module, and a high-frequency circuit; the ideal circuit includes a simulated power supply, a first simulated cable, a first converter module, a first simulated load, and a switch control module; and the high-frequency circuit includes a second simulated cable, a second converter module, and a second simulated load;

[0031] a control unit, configured to utilize the switch control module to obtain, according to the obtained load control instruction, and output a corresponding control signal to each switch device on each bridge arm of the first converter module, so as to control the on and off of the switch device;

[0032] a processing unit, configured to use the rising and falling edge processing module to perform rising edge and falling edge processing on the voltage monitoring signal and the current monitoring signal of each bridge arm in each first converter module, respectively, to obtain a voltage processing signal and a current processing signal; wherein, when the voltage monitoring signal is the voltage signal of the upper arm switching device, the current monitoring signal is the current signal of the lower arm switching device; when the voltage monitoring signal is the voltage signal of the lower arm switching device, the current monitoring signal is the current signal of the upper arm switching device;

[0033] A simulation unit is used to use the voltage processing signal and the current processing signal as the voltage source and current source on each bridge arm in the second converter module, and to obtain a simulation result corresponding to the load control instruction using the high-frequency circuit.

[0034] The present invention also provides a conducted interference simulation device for a converter, comprising:

[0035] Memory for storing computer programs;

[0036] The processor is configured to implement the steps of the above-mentioned method for simulating conducted interference of a converter when executing the computer program.

[0037] In addition, the present invention also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method for simulating conducted interference of a converter as described in any one of the above are implemented.

[0038] The present invention provides a method for simulating conducted interference of a converter, comprising: obtaining a converter conducted interference simulation circuit; wherein the converter conducted interference simulation circuit comprises an ideal circuit, a rising and falling edge processing module, and a high-frequency circuit; the ideal circuit comprises a simulated power supply, a first simulated cable, a first converter module, a first simulated load, and a switch control module; the high-frequency circuit comprises a second simulated cable, a second converter module, and a second simulated load; utilizing the switch control module, according to the obtained load control instruction, obtaining and outputting corresponding control signals to each switching device on each bridge arm in the first converter module to control the conduction and shutdown of the switching device; utilizing a rising and falling edge processing module, which processes the voltage monitoring signal and the current monitoring signal of each bridge arm in each first converter module at the rising edge and the falling edge, respectively, to obtain a voltage processing signal and a current processing signal; wherein, when the voltage monitoring signal is the voltage signal of the upper arm switching device, the current monitoring signal is the current signal of the lower arm switching device; when the voltage monitoring signal is the voltage signal of the lower arm switching device, the current monitoring signal is the current signal of the upper arm switching device; and uses the voltage processing signal and the current processing signal as excitation for the voltage source and the current source on each bridge arm in the second converter module, and uses a high-frequency circuit to obtain a simulation result corresponding to the load control instruction;

[0039] It can be seen that the present invention establishes models of an ideal circuit and a high-frequency circuit in the same simulation circuit, respectively, solving the problem of incompatibility between high-frequency circuits and low-frequency circuits; uses an ideal circuit to simulate the action of the switching device under real-time working conditions, and uses the rising and falling edge processing modules to process the voltage and current signals of the switching device measured in the ideal circuit, simulating the voltage change rate and current change rate of the actual switching device, and replacing the switching device in the high-frequency circuit as an excitation source to achieve simultaneous simulation of common mode and differential mode, thereby achieving high-precision simulation of the conducted interference of the converter, and facilitating subsequent conducted interference suppression analysis. In addition, the present invention also provides a conducted interference simulation device, equipment and computer-readable storage medium for a converter, which also have the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0041] Figure 1 A flow chart of a method for simulating conducted interference of a converter provided by an embodiment of the present invention;

[0042] Figure 2A schematic structural diagram of a converter conducted interference simulation circuit provided by an embodiment of the present invention;

[0043] Figure 3 A schematic diagram of parasitic capacitance of an IGBT model provided by an embodiment of the present invention;

[0044] Figure 4 A schematic diagram of the initial structure of a multi-conductor transmission line model of a three-phase shielded cable provided by an embodiment of the present invention;

[0045] Figure 5 A schematic diagram of a simplified structure of a multi-conductor transmission line model of a three-phase shielded cable provided by an embodiment of the present invention;

[0046] Figure 6 A schematic diagram of a LISN circuit model provided by an embodiment of the present invention;

[0047] Figure 7 A structural block diagram of a conducted interference simulation device for a converter provided by an embodiment of the present invention;

[0048] Figure 8 A simplified structural diagram of a conducted interference simulation device for a converter provided by an embodiment of the present invention;

[0049] Figure 9 A schematic diagram of the specific structure of a conducted interference simulation device for a converter provided by an embodiment of the present invention;

[0050] Figure 10 A schematic structural diagram of a computer-readable storage medium provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0052] Please refer to Figure 1 , Figure 1 This is a flow chart of a method for simulating conducted interference of a converter provided by an embodiment of the present invention. The method may include:

[0053] Step 101: Obtain a converter conducted interference simulation circuit; wherein the converter conducted interference simulation circuit includes an ideal circuit, a rising and falling edge processing module and a high-frequency circuit, the ideal circuit includes a simulated power supply, a first simulated cable, a first converter module, a first simulated load and a switch control module, and the high-frequency circuit includes a second simulated cable, a second converter module and a second simulated load.

[0054] It is understood that the converter conducted interference simulation circuit in this embodiment can be a simulation circuit used in simulation software to simulate an actual circuit including a converter (such as a rectifier, inverter, AC converter, or DC converter, etc.) to simulate the conducted interference (such as common-mode and differential-mode noise) generated by the operation of switching devices in the converter of the actual circuit. Accordingly, the first converter module in the ideal circuit can adopt an inverter circuit, a rectifier circuit, a boost converter circuit (BOOST circuit), or a buck converter circuit (BUCK circuit).

[0055] Correspondingly, the converter conducted interference simulation circuit in this embodiment may include an ideal circuit (i.e., a model of an ideal circuit), a rising and falling edge processing module, and a high-frequency circuit (i.e., a model of a high-frequency circuit). The ideal circuit can be used to simulate real-time working conditions, such as converter intermediate DC voltage simulation, switch control algorithm simulation, load current simulation, and power simulation; that is, the ideal circuit can simulate real-time interference conditions under various working conditions based on the input load control instructions under various working conditions, so as to facilitate the study of interference conditions under different working conditions. The high-frequency circuit can be a high-frequency model of each component in the frequency band of interest (i.e., the target frequency band) established based on the actual circuit (such as the test operation circuit) without considering the low-frequency impedance circuit. The switching device in the converter (i.e., the second converter module) in the high-frequency circuit is the interference source, and the voltage and current of the switching device in the ideal circuit processed by the rising and falling edge processing module can be used as the excitation source (i.e., voltage source and current source) for replacing the switching device.

[0056] Accordingly, the rising and falling edge processing module can be used to process the first converter module (such as Figure 2 The voltage monitoring signal and current monitoring signal of each bridge arm in the power module of the ideal circuit in the embodiment are processed on the rising and falling edges respectively, simulating the du / dt (voltage change rate) and di / dt (current change rate) of the actual switching device, and then injected into the second converter module of the high-frequency circuit (such as Figure 2 In the power module in the ideal circuit in the figure, it serves as the excitation source for the high-frequency circuit.

[0057] It should be noted that the specific method for obtaining the converter conduction interference simulation circuit in this embodiment can be set by the designer according to practical scenarios and user needs. For example, the processor can directly obtain a pre-stored converter conduction interference simulation circuit, that is, the processor can run simulation software to read the pre-stored converter conduction interference simulation circuit. The processor can also construct a converter conduction interference simulation circuit; for example, the user can use simulation software to construct a converter conduction interference simulation circuit. This embodiment does not impose any restrictions on this.

[0058] Step 102: using the switch control module to obtain and output corresponding control signals to each switch device on each bridge arm in the first converter module according to the obtained load control instruction, so as to control the on and off of the switch device.

[0059] Among them, the switch control module in this embodiment can be a simulation module that integrates the actual switch control algorithm. It can control the on and off of each switching device on each bridge arm in the first converter module in the ideal circuit through the control signal according to the load control instruction (such as the speed and torque instruction of the motor, etc.) to achieve different operating conditions; during the operation of the ideal circuit, the voltage and current of each switching device are monitored to obtain the voltage monitoring signal and current monitoring signal of each bridge arm in the first converter module, and input them into the rising and falling edge processing module for processing; for example, the voltage signal of the switching device of the upper arm of each bridge arm in the first converter module (i.e., the upper arm switching device) is monitored, and the current signal of the switching device of the lower arm of each bridge arm (i.e., the lower arm switching device) is monitored, i.e., the voltage monitoring signal The control signal is the voltage signal of the upper arm switching device, and the current monitoring signal is the current signal of the lower arm switching device. A voltage source is set for the upper arm of each bridge arm in the second converter module, and a current source is set for the lower arm; the current signal of the switching device of the upper arm of each bridge arm in the first converter module (i.e., the upper arm switching device) can also be monitored, and the voltage signal of the switching device of the lower arm of each bridge arm (i.e., the lower arm switching device) can be monitored, that is, the voltage monitoring signal is the current signal of the upper arm switching device, and the current monitoring signal is the voltage signal of the lower arm switching device. A current source is set for the upper arm of each bridge arm in the second converter module, and a voltage source is set for the lower arm; accordingly, the number of voltage monitoring signals and current monitoring signals input by the rising and falling edge processing modules can be the same as the number of bridge arms in the first converter module.

[0060] Correspondingly, the load control instruction in this embodiment can be a control instruction pre-set for controlling a load (such as a motor), such as the load control instruction used by the actual test operation circuit during the test process. The switch control module in this embodiment can be specifically a PWM (Pulse Width Modulation) control module, which is used to obtain and output corresponding PWM signals to each switch device on each bridge arm in the first converter module according to the load control instruction. Figure 2 As shown, when the first simulated load is a motor model, the switch control module PWM control module (PWM control algorithm module) can output corresponding PWM signals to the control ends of the six switching devices (Q1-6) on the three bridge arms in the power module (i.e., the first converter module) of the three-phase inverter according to the input speed command and / or torque command (i.e., load control command) to control the conduction and shutdown of the six switching devices.

[0061] Furthermore, in some embodiments, the processor can utilize the switch control module to obtain and output corresponding control signals to each switching device based on the obtained load control instruction and the feedback signal from the first simulated load. In other words, the switch control module can form a closed-loop control with the feedback signal from the first simulated load to achieve more accurate control of the switching devices.

[0062] It should be noted that the specific circuit structure of the ideal circuit in the converter conducted interference simulation circuit in this embodiment can be set by the designer according to the practical scenario and user needs, such as setting it according to the actual circuit containing the converter to be simulated; for example, the ideal circuit can be a functional simulation circuit, and each circuit element in the ideal circuit (such as the simulated power supply, the first simulated cable, the first converter module and the first simulated load, etc.) is aimed at functional simulation, and the circuit structure is consistent with the actual circuit, and high-frequency parameters are not considered; Figure 2 As shown, taking an ideal circuit established for an actual circuit including an inverter as an example, the ideal circuit may include a DC power supply (i.e., a simulated power supply), a busbar / cable (i.e., a first simulated cable), a power module (i.e., a first converter module), and a motor (i.e., a first simulated load). It may also include a supporting capacitor and a LISN (Line Impedance Stabilization Network) module (i.e., a first LISN module). Accordingly, the first converter module may be a three-phase inverter circuit, and the first converter module includes a first switching device (Q1), a second switching device (Q2), a third switching device (Q3), a fourth switching device (Q4), a fifth switching device (Q5), a sixth switching device (Q6), three voltage acquisition devices (V1-3), and three current acquisition devices (A1-3);

[0063] Among them, the first ends of the first switching device, the second switching device and the third switching device are all connected to the positive pole of the simulated power supply through the first simulation cable, and the simulated power supply is a DC power supply; the second ends of the fourth switching device, the fifth switching device and the sixth switching device are all connected to the negative pole of the simulated power supply through the first simulation cable through a corresponding current acquisition device; the second end of the first switching device is connected to the first end of the fourth switching device, and the common end thereof is connected to the first input end of the first simulated load as the first AC output end of the first converter module through the first simulation cable; the second end of the second switching device is connected to the first end of the fifth switching device, and the common end thereof is connected to the second input end of the first simulated load as the second AC output end of the first converter module through the first simulation cable; the second end of the third switching device is connected to the first end of the sixth switching device, and the common end thereof is connected to the third input end of the first simulated load as the third AC output end of the first converter module through the first simulation cable;

[0064] The two ends of the first switching device, the second switching device and the third switching device are respectively connected in parallel with a corresponding voltage acquisition device; the output ends of the three voltage acquisition devices are respectively connected to the three voltage input ends of the rising and falling edge processing module (rising / falling edge processing module), which are used to transmit the voltage monitoring signals of the three bridge arms in the first converter module; the output ends of the three current acquisition devices are respectively connected to the three current input ends of the rising and falling edge processing module, which are used to transmit the current monitoring signals of the three bridge arms in the first converter module; the control ends of the first to sixth switching devices are respectively connected to the six control signal output ends of the switch control module.

[0065] Step 103: Use the rising and falling edge processing module to perform rising edge and falling edge processing on the voltage monitoring signal and current monitoring signal of each bridge arm in each first converter module, respectively, to obtain a voltage processing signal and a current processing signal; wherein, when the voltage monitoring signal is the voltage signal of the upper arm switching device, the current monitoring signal is the current signal of the lower arm switching device; when the voltage monitoring signal is the voltage signal of the lower arm switching device, the current monitoring signal is the current signal of the upper arm switching device.

[0066] It can be understood that the rising and falling edge processing module in this embodiment can process the rising and falling edges of the voltage monitoring signal and the current monitoring signal measured in the ideal circuit, model the interference source through the processing of the rising and falling edges, adapt to all switching devices, have wide adaptability, simple acquisition of modeling parameters, and are suitable for the product development process.

[0067] like Figure 3As shown, the upper curve is changed to the lower curve, and the rising and falling slopes are the corresponding preset du / dt (voltage change rate) and preset di / dt (current change rate). For example, the processor uses the rising and falling edge processing modules to process the voltage monitoring signal of each bridge arm in each first converter module according to the preset voltage change rate, and obtain the voltage processing signal; according to the preset current change rate, the processor processes the current monitoring signal of each bridge arm in each first converter module according to the rising and falling edges, and obtains the current processing signal.

[0068] Correspondingly, the preset voltage change rate and the preset current change rate can be data in the product manual of the switching device; in order to ensure the accuracy of the preset voltage change rate and the preset current change rate, they can be obtained through a double pulse test of the switching device, that is, the preset voltage change rate and the preset current change rate are obtained through the double pulse test results corresponding to the switching device.

[0069] Step 104: using the voltage processed signal and the current processed signal as excitations for the voltage source and the current source on each bridge arm in the second converter module, and using a high-frequency circuit to obtain simulation results corresponding to the load control instruction.

[0070] It is understood that the voltage source and current source in the second converter module of the high-frequency circuit in this embodiment can be stimulated by the corresponding voltage processing signal and current processing signal to output voltage and current, thereby realizing the function of the switching device. In this embodiment, an ideal circuit and a high-frequency circuit are established in the same simulation software. By running the ideal circuit and the high-frequency circuit in parallel, real-time interference conditions in any operating condition can be simulated. This is extremely advantageous for studying interference under different operating conditions. Compared with the prior art method of directly adding high-frequency parameters to the ideal circuit, this method can avoid the complex modeling process and the problem of non-convergence of calculations, and solve the problem of incompatibility between high-frequency and low-frequency circuits.

[0071] Correspondingly, the specific circuit structure of the high-frequency circuit in the converter conducted interference simulation circuit in this embodiment can be set by the designer according to the practical scenario and user needs, such as being set according to the actual circuit including the converter to be simulated; for example, the high-frequency circuit can be a high-frequency model of each component in the frequency band of interest (i.e., the target frequency band) established according to the actual circuit, without considering the low-frequency impedance circuit; Figure 2As shown, taking a high-frequency circuit established for an actual circuit including an inverter as an example, the high-frequency circuit may include a busbar / cable (i.e., a second simulated cable), a power module (i.e., a second converter module), and a motor (i.e., a second simulated load), and may also include a LISN module (i.e., a second LISN module) and capacitors and inductors connected between the two input terminals of the power module. Accordingly, the second converter module may include a first voltage source (U1), a second voltage source (U2), a third voltage source (U3), a first current source (I1), a second current source (I2), a third current source (I3), three first inductors (L1-3), three second inductors (L4-6), three third inductors (L7-9), and three capacitors (C1-3).

[0072] Among them, the three voltage output ends of the rising and falling edge processing module are respectively connected to the excitation input ends of the first voltage source, the second voltage source and the third voltage source, and the three current output ends of the rising and falling edge processing module are respectively connected to the excitation input ends of the first current source, the second current source and the third current source; the first ends of the first voltage source, the second voltage source and the third voltage source are all used as one input end of the second converter module through their respective corresponding first inductor devices, and are connected to the LISN module of the second converter module through the second simulation cable; the second ends of the first voltage source, the second voltage source and the third voltage source are respectively connected to the first end of their respective corresponding capacitor devices The first ends of the first current source, the second current source and the third current source are connected to the first end of the capacitor through their respective corresponding second inductors, and the common end of the first ends of the three capacitors and the three second inductors serves as the three AC output ends of the second converter module and is connected to the three input ends of the second simulated load through the second simulation cable; the second ends of the first current source, the second current source and the third current source are connected to the other input end of the second converter module through their respective corresponding third inductors, and are connected to the LISN module of the second converter module through the second simulation cable.

[0073] Correspondingly, Figure 2 The converter conduction interference simulation circuit in the paper is simplified, and the specific models of each circuit component can be as follows Figure 3-Figure 6 As shown. Figure 3 As shown in Figure 1, when the switching device in the first converter module adopts the IGBT model, due to the parasitic capacitance between the IGBT substrate (metal) and the heat sink of the inverter, the high-frequency components caused by the high dv / dt (voltage change rate) caused by the rapid switching of the IGBT will flow through these capacitors and enter the ground plane. In addition, the parasitic capacitance between the DC busbar and the heat sink will also provide a channel for common-mode noise. Therefore, the parameters of these capacitors will be simulated and calculated based on the three-dimensional model of the IGBT module, as shown in Figure 1. Figure 3The high-frequency distribution parameters are extracted as shown. The three substrates in the figure are the DC positive busbar, DC negative busbar and AC output busbar.

[0074] like Figure 4 and Figure 5 As shown, taking the three-phase shielded cable of the second simulation cable between the second converter module and the second simulation cable as an example, the multi-conductor transmission line model per unit length is as follows: Figure 4 As shown; Figure 4 Where R is the resistance per unit length of the inner conductor of the cable, L is the inductance per unit length of the inner conductor, C is the capacitance per unit length of the inner conductor to the shielding layer, and L m and C m Indicates the mutual inductance and mutual capacitance per unit length between two inner conductors. Considering that each phase cable has a shielding layer, the mutual capacitance C between phase cables is m is zero, and the cable phase spacing is large (more than 50mm), the conductor mutual inductance is much smaller than the self-inductance, so the multi-conductor transmission line model of the three-phase shielded cable can be simplified to Figure 5 .

[0075] like Figure 6 As shown, the LISN model (such as the second LISN model) takes the CISPR25 (a design standard) standard as an example, and can directly use the RLC (resistance, inductance and capacitance) model and topology structure in the standard for modeling. The LISN model works in the frequency range of 100kHz to 150MHz. Figure 6 shown.

[0076] Correspondingly, for the modeling of the load in the actual circuit, i.e. the first simulated load in the ideal circuit and the second simulated load in the high-frequency circuit, taking the modeling of the motor (i.e. load) in the motor drive control system circuit as an example, the motor serves as an important path for the conduction interference of the drive control system to flow through, and the accuracy of its high-frequency model is crucial to the accuracy of the system conduction interference prediction model built in the next step; However, current motor high-frequency modeling is often carried out based on its physical structure, and the modeling process is complicated, the error is large, the versatility is poor, and the model frequency band coverage is narrow. Therefore, in the present embodiment, the modeling method of the motor behavior based on vector matching can be utilized to model the motor, and the motor is treated as a "black box", and the actual physical significance of the complex structure inside the motor does not need to be considered, and the frequency-varying effect of the motor impedance is particularly suitable for fitting modeling. That is to say, the first simulated load and the second simulated load in the present embodiment can both be the motor model obtained by the motor behavior modeling based on vector matching.

[0077] Furthermore, in this embodiment, the processor uses a high-frequency circuit to obtain the simulation results corresponding to the load control instructions, and can compare the simulation results with the operation test results of the actual circuit to obtain interference test results to detect whether the interference of the actual circuit exceeds the standard, thereby avoiding the calculation process of common mode and differential mode.

[0078] In this embodiment, the embodiment of the present invention solves the problem of incompatibility between high-frequency circuits and low-frequency circuits by respectively establishing models of ideal circuits and high-frequency circuits in the same simulation circuit; uses the ideal circuit to simulate the action of the switching device under real-time working conditions, and uses the rising and falling edge processing modules to process the voltage and current signals of the switching device measured in the ideal circuit, simulates the voltage change rate and current change rate of the actual switching device, and replaces the switching device in the high-frequency circuit as an excitation source to achieve simultaneous simulation of common mode and differential mode, thereby achieving high-precision simulation of the conducted interference of the converter and facilitating subsequent conducted interference suppression analysis.

[0079] Corresponding to the above method embodiment, an embodiment of the present invention further provides a conduction interference simulation device for a converter. The conduction interference simulation device for a converter described below and the conduction interference simulation method for a converter described above can refer to each other.

[0080] Please refer to Figure 7 , Figure 7 This is a structural block diagram of a conducted interference simulation device for a converter provided by an embodiment of the present invention. The device may include:

[0081] An acquisition unit 10 is configured to acquire a converter conducted interference simulation circuit, wherein the converter conducted interference simulation circuit includes an ideal circuit, a rising and falling edge processing module, and a high-frequency circuit. The ideal circuit includes a simulated power supply, a first simulated cable, a first converter module, a first simulated load, and a switch control module. The high-frequency circuit includes a second simulated cable, a second converter module, and a second simulated load.

[0082] The control unit 20 is configured to use the switch control module to obtain and output corresponding control signals to each switch device on each bridge arm in the first converter module according to the obtained load control instruction, so as to control the on and off of the switch device;

[0083] The processing unit 30 is configured to perform rising-edge and falling-edge processing on the voltage monitoring signal and the current monitoring signal of each bridge arm in each first converter module, respectively, using the rising-edge and falling-edge processing modules to obtain a voltage processing signal and a current processing signal; wherein, when the voltage monitoring signal is the voltage signal of the upper-arm switching device, the current monitoring signal is the current signal of the lower-arm switching device; and when the voltage monitoring signal is the voltage signal of the lower-arm switching device, the current monitoring signal is the current signal of the upper-arm switching device.

[0084] The simulation unit 40 is configured to use the voltage processing signal and the current processing signal as the voltage source and the current source on each bridge arm in the second converter module, and obtain simulation results corresponding to the load control instruction using a high-frequency circuit.

[0085] In some embodiments, the processing unit 30 may be specifically configured to utilize the switch control module to obtain and output corresponding control signals to each switch device according to the obtained load control instruction and the feedback signal of the first simulated load.

[0086] In some embodiments, the processing unit 30 may include:

[0087] a voltage processing subunit, configured to process the voltage monitoring signal of each bridge arm in each first converter module at the rising edge and the falling edge respectively according to a preset voltage change rate, and obtain a voltage processing signal;

[0088] The current processing subunit is used to process the current monitoring signal of each bridge arm in each first converter module at the rising edge and the falling edge respectively according to a preset current change rate to obtain a current processing signal.

[0089] In some embodiments, the preset voltage change rate and the preset current change rate are obtained through double pulse test results corresponding to the switching device.

[0090] In some embodiments, the first simulated load and the second simulated load are both motor models, and the load control instruction includes a speed instruction and / or a torque instruction.

[0091] In some embodiments, both the first simulated load and the second simulated load are motor models obtained by motor behavior modeling based on vector matching.

[0092] In some embodiments, the switching device is an IGBT model.

[0093] In some embodiments, the ideal circuit further includes a first LISN module, and the high-frequency circuit further includes a second LISN module.

[0094] In some embodiments, the switch control module is a PWM control module, which is used to obtain and output corresponding PWM signals to each switch device on each bridge arm in the first converter module according to the load control instruction.

[0095] In some embodiments, the first converter module is an inverter circuit, a rectifier circuit, a boost converter circuit, or a buck converter circuit.

[0096] In some embodiments, the first converter module is a three-phase inverter circuit, and the first converter module includes a first switching device, a second switching device, a third switching device, a fourth switching device, a fifth switching device, a sixth switching device, three voltage collection devices, and three current collection devices;

[0097] Among them, the first ends of the first switching device, the second switching device and the third switching device are all connected to the positive pole of the simulated power supply through the first simulation cable, and the simulated power supply is a DC power supply; the second ends of the fourth switching device, the fifth switching device and the sixth switching device are all connected to the negative pole of the simulated power supply through the first simulation cable through a corresponding current acquisition device; the second end of the first switching device is connected to the first end of the fourth switching device, and the common end thereof is connected to the first input end of the first simulated load as the first AC output end of the first converter module through the first simulation cable; the second end of the second switching device is connected to the first end of the fifth switching device, and the common end thereof is connected to the second input end of the first simulated load as the second AC output end of the first converter module through the first simulation cable; the second end of the third switching device is connected to the first end of the sixth switching device, and the common end thereof is connected to the third input end of the first simulated load as the third AC output end of the first converter module through the first simulation cable;

[0098] The two ends of the first switching device, the second switching device and the third switching device are respectively connected in parallel with a corresponding voltage acquisition device; the output ends of the three voltage acquisition devices are respectively connected to the three voltage input ends of the rising and falling edge processing module, for transmitting the voltage monitoring signals of the three bridge arms in the first converter module; the output ends of the three current acquisition devices are respectively connected to the three current input ends of the rising and falling edge processing module, for transmitting the current monitoring signals of the three bridge arms in the first converter module; the control ends of the first to sixth switching devices are respectively connected to the six control signal output ends of the switch control module.

[0099] In some embodiments, the second converter module includes a first voltage source, a second voltage source, a third voltage source, a first current source, a second current source, a third current source, three first inductors, three second inductors, three third inductors, and three capacitors;

[0100] The three voltage output terminals of the rising and falling edge processing module are respectively connected to the excitation input terminals of the first voltage source, the second voltage source, and the third voltage source; the three current output terminals of the rising and falling edge processing module are respectively connected to the excitation input terminals of the first current source, the second current source, and the third current source;

[0101] The first ends of the first voltage source, the second voltage source, and the third voltage source are each connected to the LISN module of the second converter module through a corresponding first inductor device through a second simulation cable; the second ends of the first voltage source, the second voltage source, and the third voltage source are respectively connected to the first end of a corresponding capacitor device, and the second ends of the three capacitor devices are all grounded; the first ends of the first current source, the second current source, and the third current source are each connected to the first end of a capacitor device through a corresponding second inductor device, and the common end at which the first ends of the three capacitor devices are connected to the three second inductors serves as the three AC output ends of the second converter module and is connected to the three input ends of the second simulation load through the second simulation cable;

[0102] The second ends of the first current source, the second current source and the third current source are connected to the LISN module of the second converter module through a second simulation cable via a corresponding third inductor device.

[0103] In this embodiment, the embodiment of the present invention solves the problem of incompatibility between high-frequency circuits and low-frequency circuits by respectively establishing models of ideal circuits and high-frequency circuits in the same simulation circuit; uses the ideal circuit to simulate the action of the switching device under real-time working conditions, and uses the rising and falling edge processing modules to process the voltage and current signals of the switching device measured in the ideal circuit, simulates the voltage change rate and current change rate of the actual switching device, and replaces the switching device in the high-frequency circuit as an excitation source to achieve simultaneous simulation of common mode and differential mode, thereby achieving high-precision simulation of the conducted interference of the converter and facilitating subsequent conducted interference suppression analysis.

[0104] Corresponding to the above method embodiment, an embodiment of the present invention further provides a conduction interference simulation device for a converter. The conduction interference simulation device for a converter described below and the conduction interference simulation method for a converter described above can refer to each other.

[0105] Please refer to Figure 8 , Figure 8 This is a simplified structural diagram of a conducted interference simulation device for a converter provided by an embodiment of the present invention. The conducted interference simulation device may include:

[0106] Memory D1, for storing computer programs;

[0107] The processor D2 is configured to implement the steps of the method for simulating conducted interference of a converter provided by the above method embodiment when executing a computer program.

[0108] For details, please refer to Figure 9 , Figure 9A schematic diagram of the specific structure of a conducted interference simulation device for a converter provided in an embodiment of the present invention, wherein the conducted interference simulation device 310 may have relatively large differences due to different configurations or performances, and may include one or more processors (central processing units, CPU) 322 (for example, one or more processors) and a memory 332, and one or more storage media 330 (for example, one or more massive storage devices) for storing application programs 342 or data 344. Among them, the memory 332 and the storage medium 330 may be temporary storage or permanent storage. The program stored in the storage medium 330 may include one or more units (not shown in the figure), and each unit may include a series of instruction operations on the host. Furthermore, the central processing unit 322 may be configured to communicate with the storage medium 330 to execute a series of instruction operations in the storage medium 330 on the conducted interference simulation device 310.

[0109] The conducted interference simulation device 310 may further include one or more power supplies 326 , one or more wired or wireless network interfaces 350 , one or more input and output interfaces 358 , and / or one or more operating systems 341 .

[0110] The conducted interference simulation device 310 may be specifically a computer or a server.

[0111] The steps in the above-described method for simulating conducted interference of a converter can be implemented by the structure of a device for simulating conducted interference of a converter.

[0112] Corresponding to the above method embodiment, an embodiment of the present invention further provides a computer-readable storage medium. The computer-readable storage medium described below and the conducted interference simulation method of a converter described above can refer to each other.

[0113] Please refer to Figure 10 , Figure 10 The computer-readable storage medium 50 stores a computer program 51, which, when executed by a processor, implements the steps of the converter conduction interference simulation method provided in the above method embodiment.

[0114] The computer-readable storage medium 50 may be a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, among other storage media capable of storing program codes.

[0115] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. References to the common and similar parts between the various embodiments are sufficient. The devices, apparatuses, and computer-readable storage media disclosed in the embodiments are described briefly because they correspond to the methods disclosed in the embodiments. For relevant details, refer to the description of the methods.

[0116] The above is a detailed introduction to the conduction interference simulation method, device, equipment and computer-readable storage medium of a converter provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for simulating conducted interference of a converter, characterized in that: include: Obtain a converter conducted interference simulation circuit; wherein the converter conducted interference simulation circuit includes an ideal circuit, a rising and falling edge processing module, and a high-frequency circuit; the ideal circuit includes a simulated power supply, a first simulated cable, a first converter module, a first simulated load, and a switch control module; the high-frequency circuit includes a second simulated cable, a second converter module, and a second simulated load; Using the switch control module, according to the obtained load control instruction, to obtain and output corresponding control signals to each switch device on each bridge arm in the first converter module, so as to control the on and off of the switch device; Utilizing the rising and falling edge processing module, performing rising edge and falling edge processing on the voltage monitoring signal and the current monitoring signal of each bridge arm in each of the first converter modules, respectively, to obtain a voltage processing signal and a current processing signal; wherein, when the voltage monitoring signal is the voltage signal of the upper arm switching device, the current monitoring signal is the current signal of the lower arm switching device; and when the voltage monitoring signal is the voltage signal of the lower arm switching device, the current monitoring signal is the current signal of the upper arm switching device; The voltage processing signal and the current processing signal are used as excitations for the voltage source and the current source on each bridge arm in the second converter module, and the high-frequency circuit is used to obtain a simulation result corresponding to the load control instruction.

2. The method for simulating conducted interference of a converter according to claim 1, wherein: The using the switch control module to obtain and output corresponding control signals to the switch devices on each bridge arm in the first converter module according to the obtained load control instruction includes: The switch control module is utilized to obtain and output corresponding control signals to each of the switch devices according to the obtained load control instruction and the feedback signal of the first simulated load.

3. The method for simulating conducted interference of a converter according to claim 1, wherein: The method of using the rising and falling edge processing module to perform rising edge and falling edge processing on the voltage monitoring signal and the current monitoring signal of each bridge arm in each first converter module to obtain a voltage processing signal and a current processing signal includes: According to a preset voltage change rate, the voltage monitoring signal of each bridge arm in each first converter module is processed at the rising edge and the falling edge to obtain the voltage processing signal; According to a preset current change rate, the current monitoring signal of each bridge arm in each first converter module is processed at the rising edge and the falling edge to obtain the current processing signal.

4. The method for simulating conducted interference of a converter according to claim 3, wherein: The preset voltage change rate and the preset current change rate are obtained through double pulse test results corresponding to the switching device.

5. The method for simulating conducted interference of a converter according to claim 1, wherein: The first simulated load and the second simulated load are both motor models, and the load control instruction includes a speed instruction and / or a torque instruction.

6. The method for simulating conducted interference of a converter according to claim 5, characterized in that: The first simulated load and the second simulated load are both motor models obtained by motor behavior modeling based on vector matching.

7. The method for simulating conducted interference of a converter according to claim 1, wherein: The switching device is an IGBT model.

8. The method for simulating conducted interference of a converter according to claim 1, wherein: The ideal circuit further includes a first LISN module, and the high-frequency circuit further includes a second LISN module.

9. The method for simulating conducted interference of a converter according to claim 1, wherein: The switch control module is a PWM control module, which is used to obtain and output corresponding PWM signals to each switch device on each bridge arm in the first converter module according to the load control instruction.

10. The method for simulating conducted interference of a converter according to any one of claims 1 to 9, characterized in that: The first converter module is an inverter circuit, a rectifier circuit, a boost conversion circuit or a buck conversion circuit.

11. The method for simulating conducted interference of a converter according to claim 10, wherein: The first converter module is a three-phase inverter circuit, and the first converter module includes a first switching device, a second switching device, a third switching device, a fourth switching device, a fifth switching device, a sixth switching device, three voltage collection devices and three current collection devices; Wherein, the first ends of the first switching device, the second switching device and the third switching device are all connected to the positive electrode of the simulated power supply through the first simulation cable, and the simulated power supply is a DC power supply; the second ends of the fourth switching device, the fifth switching device and the sixth switching device are all connected to the negative electrode of the simulated power supply through the first simulation cable via one of the current acquisition devices corresponding to each of them; the second end of the first switching device is connected to the first end of the fourth switching device, and the common end thereof serves as the first AC output end of the first converter module and is connected to the first input end of the first simulated load through the first simulation cable; the second end of the second switching device is connected to the first end of the fifth switching device, and the common end thereof serves as the second AC output end of the first converter module and is connected to the second input end of the first simulated load through the first simulation cable; the second end of the third switching device is connected to the first end of the sixth switching device, and the common end thereof serves as the third AC output end of the first converter module and is connected to the third input end of the first simulated load through the first simulation cable; The two ends of the first switching device, the second switching device and the third switching device are respectively connected in parallel with a corresponding voltage acquisition device; the output ends of the three voltage acquisition devices are respectively connected to the three voltage input ends of the rising and falling edge processing module, for transmitting the voltage monitoring signals of the three bridge arms in the first converter module; the output ends of the three current acquisition devices are respectively connected to the three current input ends of the rising and falling edge processing module, for transmitting the current monitoring signals of the three bridge arms in the first converter module; the control ends of the first to sixth switching devices are respectively connected to the six control signal output ends of the switch control module.

12. The method for simulating conducted interference of a converter according to claim 11, characterized in that: The second converter module includes a first voltage source, a second voltage source, a third voltage source, a first current source, a second current source, a third current source, three first inductors, three second inductors, three third inductors and three capacitors; The three voltage output terminals of the rising and falling edge processing module are respectively connected to the excitation input terminals of the first voltage source, the second voltage source, and the third voltage source, and the three current output terminals of the rising and falling edge processing module are respectively connected to the excitation input terminals of the first current source, the second current source, and the third current source; The first ends of the first voltage source, the second voltage source, and the third voltage source are each connected to the LISN module of the second converter module through a corresponding first inductor device through the second simulation cable; the second ends of the first voltage source, the second voltage source, and the third voltage source are respectively connected to the first end of a corresponding capacitor device, and the second ends of the three capacitor devices are all grounded; the first ends of the first current source, the second current source, and the third current source are each connected to the first end of a capacitor device through a corresponding second inductor device, and the common end of the first ends of the three capacitor devices connected to the three second inductors serves as the three AC output ends of the second converter module and is connected to the three input ends of the second simulation load through the second simulation cable; The second ends of the first current source, the second current source and the third current source are connected to the LISN module of the second converter module through the second simulation cable via a corresponding third inductor device.

13. A conduction interference simulation device for a converter, characterized in that: include: An acquisition unit is configured to acquire a converter conducted interference simulation circuit; wherein the converter conducted interference simulation circuit includes an ideal circuit, a rising and falling edge processing module, and a high-frequency circuit; the ideal circuit includes a simulated power supply, a first simulated cable, a first converter module, a first simulated load, and a switch control module; and the high-frequency circuit includes a second simulated cable, a second converter module, and a second simulated load; a control unit, configured to utilize the switch control module to obtain, according to the obtained load control instruction, and output a corresponding control signal to each switch device on each bridge arm of the first converter module, so as to control the on and off of the switch device; a processing unit, configured to use the rising and falling edge processing module to perform rising edge and falling edge processing on the voltage monitoring signal and the current monitoring signal of each bridge arm in each first converter module, respectively, to obtain a voltage processing signal and a current processing signal; wherein, when the voltage monitoring signal is the voltage signal of the upper arm switching device, the current monitoring signal is the current signal of the lower arm switching device; when the voltage monitoring signal is the voltage signal of the lower arm switching device, the current monitoring signal is the current signal of the upper arm switching device; A simulation unit is used to use the voltage processing signal and the current processing signal as the voltage source and current source on each bridge arm in the second converter module, and to obtain a simulation result corresponding to the load control instruction using the high-frequency circuit.

14. A conduction interference simulation device for a converter, characterized in that: include: memory for storing computer programs; A processor is configured to implement the steps of the method for simulating conducted interference of a converter according to any one of claims 1 to 12 when executing the computer program.

15. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for simulating conducted interference of a converter according to any one of claims 1 to 12 are implemented.

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