A method and device for obtaining an electromagnetic model of a transformer of an automotive DC / DC converter

Abstract

The present invention provides a method and device for obtaining an electromagnetic model of a transformer for an automotive DC / DC converter, comprising step S1, determining a three-dimensional finite element model of the DC / DC converter transformer; step S2, determining a material parameter model; step S3, determining a transmission parameter model based on position data of the external device; step S4, performing correlation to obtain the transformer electromagnetic model; step S5, determining a simulation circuit for the DC / DC converter and performing a simulation test to obtain a DC / DC converter simulation result; and step S6, determining whether the DC / DC converter simulation result meets preset electromagnetic compatibility performance rules. If not, modifying the three-dimensional finite element model of the transformer and performing a simulation test until the simulation result meets the preset electromagnetic compatibility performance rules; if so, outputting the transformer electromagnetic model as a final transformer electromagnetic model. The present invention provides a fast, accurate, and complete DC / DC converter transformer modeling method for electromagnetic compatibility performance prediction, significantly improving development and rectification efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a method and device for acquiring an electromagnetic model of a transformer of an automotive DC / DC converter. Background Art

[0002] Electric vehicle DC / DC converters provide power for low-voltage electrical equipment and are essential for the normal operation of electric vehicles. Their primary function is to convert 200V-500V high-voltage DC into 9V-16V DC, supporting the normal operation of onboard low-voltage electrical equipment and charging lead-acid batteries. This circuit typically consists of a DC / DC switching circuit consisting of a transformer with a magnetic core and MOSFET switching transistors. The transformer's primary function is to achieve high-to-low voltage conversion and electrical isolation between high- and low-voltage circuits, making it a key component of the entire circuit.

[0003] During DC / DC converter development, product engineers need to simulate and predict the switching power supply's electrical and electromagnetic compatibility (EMC) performance. Adjusting circuit parameters based on simulation results can effectively shorten development cycles and remediation costs. Typically, circuit-level simulations are constructed based on the DC / DC converter schematic using a transformer equivalent model, active and passive MOSFET device models, and the resulting waveforms. The simulation results include both time-domain waveforms reflecting electrical performance and frequency-domain waveforms reflecting EMC performance. To achieve accurate simulation results, particularly EMC performance, the transformer equivalent model must be wideband, covering a frequency range of at least 100 MHz. The accuracy of the transformer model is crucial for accurate simulation results. Currently, transformer modeling employs various approaches, including circuit-level models, low-frequency models, and lumped parameter circuit models assigned values ​​based on test data. These approaches suffer from limited frequency coverage and limited practicality, meeting electrical performance simulation requirements but not EMC performance. While design engineers can initially predict the electrical performance of automotive DC / DC converters, EMC performance can only be determined through physical testing and remediation later in product development. Moreover, the three modeling methods cannot accurately calculate the impact of various correction measures for electromagnetic compatibility performance, such as adding a shielded shell and multi-point grounding, on the windings and parasitic parameters. There are large errors, which leads to large deviations in the corresponding simulation results. Summary of the Invention

[0004] The purpose of the present invention is to propose a method and device for obtaining the electromagnetic model of the transformer of an automotive DC / DC converter, so as to solve the technical problems that the existing methods have insufficient frequency coverage, large errors, poor practicality, and cannot meet the requirements of electromagnetic compatibility performance simulation.

[0005] In one aspect, a method for obtaining an electromagnetic model of a transformer of an automotive DC / DC converter is provided, comprising:

[0006] Step S1, obtaining specification data of a transformer of a DC / DC converter, and determining a three-dimensional finite element model of the transformer of the DC / DC converter according to the specification data of the transformer;

[0007] Step S2, obtaining transformer material parameters, and determining a material parameter model according to the transformer material parameters;

[0008] Step S3, obtaining position data of each external device connected to the transformer of the DC / DC converter in the circuit, and determining a transmission parameter model based on the position data of the external devices;

[0009] Step S4, correlating the transformer three-dimensional finite element model, the material parameter model, and the transmission parameter model to obtain a transformer electromagnetic model;

[0010] Step S5, determining a simulation circuit of a DC / DC converter based on the transformer electromagnetic model, the preset MOSFET switch tube active device model, and the preset inductor and capacitor passive device model, and performing a simulation test on the simulation circuit of the DC / DC converter according to a preset simulation frequency to obtain a DC / DC converter simulation result;

[0011] Step S6: Determine whether the DC / DC converter simulation result meets the preset electromagnetic compatibility performance rules. If not, modify the transformer three-dimensional finite element model and perform simulation testing based on the modified DC / DC converter simulation circuit until the simulation result meets the preset electromagnetic compatibility performance rules. If so, output the transformer electromagnetic model corresponding to the DC / DC converter simulation result as the final transformer electromagnetic model.

[0012] Preferably, in step S1, determining the three-dimensional model of the transformer of the DC / DC converter specifically includes: determining the size parameters of the winding and the magnetic core according to the specification data of the transformer, building the winding constructed by wires or PCB traces according to the size parameters of the winding and the magnetic core and performing solid modeling to obtain a three-dimensional finite element model of the transformer.

[0013] Preferably, in step S2, determining the material parameter model specifically includes: obtaining material information of the conductor, dielectric, magnetic core and shielding material according to the transformer material parameters, and converting the material information of the conductor, dielectric, magnetic core and shielding material into a material parameter model that defines the conductor, dielectric and magnetic core in the transformer.

[0014] Preferably, in step S3, determining the material parameter model specifically includes: determining the boundary conditions of the DC / DC converter in the circuit based on the position data of each external device connected to the transformer of the DC / DC converter in the circuit, determining the parasitic parameters of each position based on the boundary conditions, and outputting the parasitic parameters of each position as a transmission parameter matrix as a transmission parameter model.

[0015] Preferably, step S6 includes: when the DC / DC converter simulation result does not meet the preset electromagnetic compatibility performance rules, determining the electromagnetic compatibility performance problem node according to the comparison result of the DC / DC converter simulation result and the preset electromagnetic compatibility performance rules;

[0016] Modify the size parameters of the winding or core in the three-dimensional finite element model of the transformer according to the electromagnetic performance problem node to obtain a modified three-dimensional finite element model of the transformer;

[0017] Associating the modified three-dimensional finite element model of the transformer, the material parameter model, and the transmission parameter model to obtain a modified electromagnetic model of the transformer;

[0018] The modified DC / DC converter simulation circuit is determined based on the modified transformer electromagnetic model, the preset MOSFET switch tube active device model and the preset inductor and capacitor passive device model, and the modified DC / DC converter simulation circuit is simulated and tested according to the preset simulation frequency to obtain simulation results.

[0019] On the other hand, a device for obtaining an electromagnetic model of a transformer of an automotive DC / DC converter is provided, for implementing the method for obtaining an electromagnetic model of a transformer of an automotive DC / DC converter, comprising:

[0020] An information acquisition module is used to obtain specification data of the DC / DC converter transformer, transformer material parameters, and position data of various external components connected to the DC / DC converter transformer in the circuit;

[0021] A model building module is used to determine a three-dimensional finite element model of a DC / DC converter transformer based on the transformer specification data; determine a material parameter model based on the transformer material parameters; and determine a transmission parameter model based on the position data of the external device;

[0022] a model association module for associating the three-dimensional finite element model of the transformer, the material parameter model, and the transmission parameter model to obtain an electromagnetic model of the transformer; and determining a simulation circuit of a DC / DC converter based on the electromagnetic model of the transformer, a preset MOSFET switch tube active device model, and a preset inductor and capacitor passive device model;

[0023] A simulation test module is configured to perform a simulation test on the simulation circuit of the DC / DC converter according to a preset simulation frequency to obtain a DC / DC converter simulation result; and to determine whether the DC / DC converter simulation result satisfies preset electromagnetic compatibility performance rules. If not, the three-dimensional finite element model of the transformer is modified and a simulation test is performed based on the modified DC / DC converter simulation circuit until the simulation result satisfies the preset electromagnetic compatibility performance rules. If so, the transformer electromagnetic model corresponding to the DC / DC converter simulation result is output as a final transformer electromagnetic model.

[0024] Preferably, the model building module is also used to determine the size parameters of the winding and the magnetic core according to the specification data of the transformer, build the winding constructed by wires or PCB traces according to the size parameters of the winding and the magnetic core, and perform solid modeling to obtain a three-dimensional finite element model of the transformer.

[0025] Preferably, the model building module is also used to obtain material information of conductors, dielectrics, magnetic cores and shielding materials based on transformer material parameters, and convert the material information of conductors, dielectrics, magnetic cores and shielding materials into a material parameter model that defines the conductors, dielectrics and magnetic cores in the transformer.

[0026] Preferably, the model building module is also used to determine the boundary conditions of the transformer in the circuit based on the position data of each external device connected to the transformer of the DC / DC converter in the circuit, determine the parasitic parameters of each position based on the boundary conditions, and output the parasitic parameters of each position as a transmission parameter matrix as a transmission parameter model.

[0027] Preferably, the simulation test module is further configured to determine an electromagnetic compatibility performance problem node based on a comparison result between the DC / DC converter simulation result and the preset electromagnetic compatibility performance rule when the DC / DC converter simulation result does not meet the preset electromagnetic compatibility performance rule;

[0028] Modify the size parameters of the winding or core in the three-dimensional finite element model of the transformer according to the electromagnetic performance problem node to obtain a modified three-dimensional finite element model of the transformer;

[0029] Associating the modified three-dimensional finite element model of the transformer, the material parameter model, and the transmission parameter model to obtain a modified electromagnetic model of the transformer;

[0030] The modified DC / DC converter simulation circuit is determined based on the modified transformer electromagnetic model, the preset MOSFET switch tube active device model and the preset inductor and capacitor passive device model, and the modified DC / DC converter simulation circuit is simulated and tested according to the preset simulation frequency to obtain simulation results.

[0031] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0032] The method and device for obtaining the electromagnetic model of a transformer for an automotive DC / DC converter, provided by this invention, uses a three-dimensional model to perform detailed modeling and simplification of the winding, magnetic core, and shielding shell structures. The method also sets the core material based on the frequency dependence of the magnetic material, adds boundary conditions based on the actual connection locations of external components with the DC / DC converter transformer in the actual circuit, and performs wide-band simulation. This method is suitable for all stages of DC / DC converter transformer development and can meet the requirements for time-domain simulation of electrical performance and frequency-domain simulation of electromagnetic compatibility performance in electric vehicle DC / DC converter simulation circuits composed of this transformer. It boasts wide applicability and high versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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 only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0034] Figure 1 The figure is a schematic diagram of the main process of a method for obtaining an electromagnetic model of a transformer of an automotive DC / DC converter according to an embodiment of the present invention.

[0035] Figure 2 Schematic diagram of a device for acquiring an electromagnetic model of a transformer of an automotive DC / DC converter according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0037] like Figure 1 FIG. 1 is a schematic diagram of an embodiment of a method for obtaining an electromagnetic model of a transformer of an automotive DC / DC converter provided by the present invention. In this embodiment, the method includes the following steps:

[0038] Step S1, obtaining specification data of the transformer of the DC / DC converter, and determining a three-dimensional finite element model of the transformer of the DC / DC converter based on the specification data of the transformer; it can be understood that in the electromagnetic field finite element simulation software, the three-dimensional model of the transformer of the DC / DC converter is constructed according to the specification sheet of the transformer.

[0039] In a specific embodiment, the transformer's specifications are used to determine the dimensional parameters of the windings and core. A winding constructed from wires or PCB traces is then constructed based on these dimensional parameters and solid modeling is performed to obtain a three-dimensional finite element model of the transformer. Specifically, a detailed three-dimensional finite element model is constructed based on geometric parameters such as the winding and core dimensions. This requires accurate construction and solid modeling of the winding constructed from wires or PCB traces, and the winding digital model is simplified based on the simulation computational complexity.

[0040] Step S2, obtain the transformer material parameters, and determine the material parameter model based on the transformer material parameters; it can be understood that the material parameters are mainly used to set the material parameters of the conductor, dielectric, magnetic core and shielding materials. In order to ensure the accuracy of subsequent circuit simulation, the magnetic core needs to be set according to the frequency correlation of the material parameters.

[0041] In a specific embodiment, material information for the conductor, dielectric, core, and shielding materials is obtained based on the transformer material parameters, and this information is converted into a material parameter model defining the conductor, dielectric, core, and core of the transformer. It can be understood that by setting up the material parameter model, influencing factors can be fully considered when establishing the simulation circuit, accurately simulating the actual conditions of the transformer in the actual circuit, and improving the accuracy of the transformer electromagnetic model.

[0042] Step S3, obtaining position data of each external device connected to the transformer of the DC / DC converter in the circuit, and determining a transmission parameter model based on the position data of the external devices; it is understandable that by adding boundary conditions based on the actual connection positions of each external device and the DC / DC converter transformer in the actual circuit, the complete parasitic parameters at each position can be well calculated and saved in the form of a transmission parameter matrix.

[0043] In a specific embodiment, the boundary conditions of the converter in the circuit are determined based on the position data of each external device connected to the transformer of the DC / DC converter in the circuit, the parasitic parameters of each position are determined based on the boundary conditions, and the parasitic parameters of each position are output as a transmission parameter matrix as a transmission parameter model.

[0044] Step S4, associating the three-dimensional finite element model of the transformer, the material parameter model, and the transmission parameter model to obtain a transformer electromagnetic model; through the limitations of the three-dimensional finite element model of the transformer, the material parameter model, and the transmission parameter model, the transformer state under actual working conditions can be truly simulated, providing effective data support for simulation testing.

[0045] Step S5: Determine the simulation circuit of the DC / DC converter based on the transformer electromagnetic model, the preset MOSFET switch tube active device model, and the preset inductor and capacitor passive device model, and simulate and test the simulation circuit of the DC / DC converter according to the preset simulation frequency to obtain the DC / DC converter simulation results. It can be understood that by placing the above-mentioned transformer electromagnetic model into the simulation circuit of the DC / DC converter, a variety of transient and steady-state simulation results of the DC / DC converter are obtained, which can be compared with the actual measured results. Depending on the needs of the circuit simulation, the simulation frequency range of the three-dimensional broadband simulation can be set to 100MHz or even a higher frequency range.

[0046] Step S6 determines whether the DC / DC converter simulation results meet the preset electromagnetic compatibility performance rules. If not, the transformer 3D finite element model is modified and simulation testing is performed based on the modified DC / DC converter simulation circuit until the simulation results meet the preset electromagnetic compatibility performance rules. If so, the transformer electromagnetic model corresponding to the DC / DC converter simulation results is output as the final transformer electromagnetic model. It is understood that the transformer electromagnetic model, along with the MOSFET switch active device model and the inductor and capacitor passive device models, is used to construct the DC / DC converter simulation circuit, allowing for both time-domain electrical performance simulation and frequency-domain electromagnetic compatibility performance simulation.

[0047] In a specific embodiment, by comparing simulation results, if corrective measures to improve the electromagnetic compatibility performance of the transformer are needed, these can be added and modified directly in the three-dimensional finite element model of the transformer to obtain transformer models under different corrective measures. By importing these models into the DC / DC converter simulation circuit, simulation results under various corrective measures can be quickly obtained, significantly improving the efficiency of DC / DC converter design and correction. The specific process is that when the DC / DC converter simulation results do not meet the preset electromagnetic compatibility performance rules, the electromagnetic compatibility performance problem node is determined based on the comparison results of the DC / DC converter simulation results with the preset electromagnetic compatibility performance rules;

[0048] Modify the size parameters of the winding or core in the three-dimensional finite element model of the transformer according to the electromagnetic performance problem node to obtain a modified three-dimensional finite element model of the transformer;

[0049] Associating the modified three-dimensional finite element model of the transformer, the material parameter model, and the transmission parameter model to obtain a modified electromagnetic model of the transformer;

[0050] The modified DC / DC converter simulation circuit is determined based on the modified transformer electromagnetic model, the preset MOSFET switch tube active device model and the preset inductor and capacitor passive device model, and the modified DC / DC converter simulation circuit is simulated and tested according to the preset simulation frequency to obtain simulation results.

[0051] like Figure 2 FIG2 is a schematic diagram of an embodiment of a device for obtaining an electromagnetic model of a transformer of an automotive DC / DC converter provided by the present invention. In this embodiment, the device is used to implement a method for obtaining an electromagnetic model of a transformer of an automotive DC / DC converter, including:

[0052] An information acquisition module is used to obtain specification data of the DC / DC converter transformer, transformer material parameters, and position data of each external device connected to the DC / DC converter circuit;

[0053] A model building module is used to determine a three-dimensional finite element model of a DC / DC converter transformer based on the transformer specification data; determine a material parameter model based on the transformer material parameters; and determine a transmission parameter model based on the position data of the external device;

[0054] In a specific embodiment, the model building module is further configured to determine the dimensional parameters of the winding and magnetic core based on the transformer's specification data, construct a winding constructed from wires or PCB traces based on the dimensional parameters of the winding and magnetic core, and perform solid modeling to obtain a three-dimensional finite element model of the transformer. The module is further configured to obtain material information for the conductor, dielectric, magnetic core, and shielding materials based on the transformer's material parameters, and convert this material information into a material parameter model defining the conductor, dielectric, magnetic core, and magnetic core in the transformer. The module is further configured to determine the boundary conditions of the DC / DC converter in the circuit based on the position data of each external device connected to the DC / DC converter in the circuit, determine parasitic parameters at each location based on the boundary conditions, and output the parasitic parameters at each location as a transmission parameter matrix, which serves as a transmission parameter model.

[0055] a model association module for associating the three-dimensional finite element model of the transformer, the material parameter model, and the transmission parameter model to obtain an electromagnetic model of the transformer; and determining a simulation circuit of a DC / DC converter based on the electromagnetic model of the transformer, a preset MOSFET switch tube active device model, and a preset inductor and capacitor passive device model;

[0056] A simulation test module is configured to perform a simulation test on the simulation circuit of the DC / DC converter according to a preset simulation frequency to obtain a DC / DC converter simulation result; and to determine whether the DC / DC converter simulation result satisfies preset electromagnetic compatibility performance rules. If not, the three-dimensional finite element model of the transformer is modified and a simulation test is performed based on the modified DC / DC converter simulation circuit until the simulation result satisfies the preset electromagnetic compatibility performance rules. If so, the transformer electromagnetic model corresponding to the DC / DC converter simulation result is output as a final transformer electromagnetic model.

[0057] In a specific embodiment, the simulation test module is further configured to determine an electromagnetic compatibility performance problem node based on a comparison result between the DC / DC converter simulation result and the preset electromagnetic compatibility performance rule when the DC / DC converter simulation result does not meet the preset electromagnetic compatibility performance rule;

[0058] Modify the size parameters of the winding or core in the three-dimensional finite element model of the transformer according to the electromagnetic performance problem node to obtain a modified three-dimensional finite element model of the transformer;

[0059] Associating the modified three-dimensional finite element model of the transformer, the material parameter model, and the transmission parameter model to obtain a modified electromagnetic model of the transformer;

[0060] The modified DC / DC converter simulation circuit is determined based on the modified transformer electromagnetic model, the preset MOSFET switch tube active device model and the preset inductor and capacitor passive device model, and the modified DC / DC converter simulation circuit is simulated and tested according to the preset simulation frequency to obtain simulation results.

[0061] Regarding the implementation process of the device for obtaining the electromagnetic model of the transformer of the automotive DC / DC converter, reference may be made to the aforementioned method for obtaining the electromagnetic model of the transformer of the automotive DC / DC converter, which will not be described in detail here.

[0062] In summary, the implementation of the embodiments of the present invention has the following beneficial effects:

[0063] The method and device for obtaining the electromagnetic model of a transformer for an automotive DC / DC converter, provided by this invention, uses a three-dimensional model to perform detailed modeling and simplification of the winding, magnetic core, and shielding shell structures. The method also sets the core material based on the frequency dependence of the magnetic material, adds boundary conditions based on the actual connection locations of external components with the DC / DC converter transformer in the actual circuit, and performs wide-band simulation. This method is suitable for all stages of DC / DC converter transformer development and can meet the requirements for time-domain simulation of electrical performance and frequency-domain simulation of electromagnetic compatibility performance in electric vehicle DC / DC converter simulation circuits composed of this transformer. It boasts wide applicability and high versatility.

[0064] Avoiding the shortcomings of circuit-level and low-frequency models, such as the poor accuracy, narrow frequency range, and limited practicality of lumped parameter models used to assign test results, the DC / DC converter transformer model obtained by the present invention can accurately calculate the transformer's transmission parameters and maximize the preservation of the transformer's internal parasitic parameters. It is the electromagnetic model closest to the actual object and can solve frequency ranges of 100 MHz and even higher without requiring actual testing. It is suitable for all stages of DC / DC converter transformer design, providing accurate evaluation for DC / DC converter transformer design and an accurate and rapid transformer model for simulation analysis of multiple electromagnetic compatibility performance characteristics, such as conducted emissions, radiated emissions, current distribution density, and radiated immunity, of electric vehicle DC / DC converters composed of this transformer. This method is particularly suitable for providing a rapid, accurate, and complete DC / DC converter transformer modeling method for electromagnetic compatibility performance prediction during the early stages of electric vehicle DC / DC converter development and overhaul, significantly improving the efficiency of electric vehicle DC / DC converter development and overhaul.

[0065] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for obtaining an electromagnetic model of a transformer of an automotive DC / DC converter, characterized in that: The following steps are involved: Step S1, obtaining specification data of a transformer of a DC / DC converter, and determining a three-dimensional finite element model of the transformer of the DC / DC converter according to the specification data of the transformer; Step S2, obtaining transformer material parameters, and determining a material parameter model according to the transformer material parameters; Step S3, obtaining position data of each external device connected to the transformer of the DC / DC converter in the circuit, and determining a transmission parameter model based on the position data of the external devices; Step S4, correlating the transformer three-dimensional finite element model, the material parameter model, and the transmission parameter model to obtain a transformer electromagnetic model; Step S5, determining a simulation circuit of a DC / DC converter based on the transformer electromagnetic model, the preset MOSFET switch tube active device model, and the preset inductor and capacitor passive device model, and performing a simulation test on the simulation circuit of the DC / DC converter according to a preset simulation frequency to obtain a DC / DC converter simulation result; Step S6, determining whether the DC / DC converter simulation result meets the preset electromagnetic compatibility performance rules; if not, modifying the transformer three-dimensional finite element model and performing simulation testing based on the modified DC / DC converter simulation circuit until the simulation result meets the preset electromagnetic compatibility performance rules; If the conditions are met, the transformer electromagnetic model corresponding to the DC / DC converter simulation result is output as the final transformer electromagnetic model.

2. The method according to claim 1, wherein In step S1, determining the three-dimensional model of the transformer of the DC / DC converter specifically includes: The dimensional parameters of the winding and the core are determined based on the transformer's specification data. The winding constructed by wires or PCB traces is built based on the dimensional parameters of the winding and the core and solid modeling is performed to obtain a three-dimensional finite element model of the transformer.

3. The method according to claim 2, wherein In step S2, determining the material parameter model specifically includes: The material information of the conductor, dielectric, magnetic core and shielding material is obtained according to the material parameters of the transformer, and the material information of the conductor, dielectric, magnetic core and shielding material is converted into a material parameter model that defines the conductor, dielectric and magnetic core in the transformer.

4. The method according to claim 3, wherein In step S3, determining the material parameter model specifically includes: The boundary conditions of the converter in the circuit are determined based on the position data of each external device connected to the transformer of the DC / DC converter in the circuit, the parasitic parameters of each position are determined based on the boundary conditions, and the parasitic parameters of each position are output as a transmission parameter matrix as a transmission parameter model.

5. The method according to claim 4, wherein The step S6 comprises: When the DC / DC converter simulation result does not meet the preset electromagnetic compatibility performance rules, an electromagnetic compatibility performance problem node is determined based on a comparison result between the DC / DC converter simulation result and the preset electromagnetic compatibility performance rules; Modify the size parameters of the winding or core in the three-dimensional finite element model of the transformer according to the electromagnetic performance problem node to obtain a modified three-dimensional finite element model of the transformer; Associating the modified three-dimensional finite element model of the transformer, the material parameter model, and the transmission parameter model to obtain a modified electromagnetic model of the transformer; The modified DC / DC converter simulation circuit is determined based on the modified transformer electromagnetic model, the preset MOSFET switch tube active device model and the preset inductor and capacitor passive device model, and the modified DC / DC converter simulation circuit is simulated and tested according to the preset simulation frequency to obtain simulation results.

6. A device for acquiring an electromagnetic model of a transformer of an automotive DC / DC converter, for implementing the method according to any one of claims 1 to 5, characterized in that: include: An information acquisition module is used to obtain specification data of the DC / DC converter transformer, transformer material parameters, and position data of each external device connected to the DC / DC converter circuit; A model building module is used to determine a three-dimensional finite element model of a DC / DC converter transformer based on the transformer specification data; determine a material parameter model based on the transformer material parameters; and determine a transmission parameter model based on the position data of the external device; a model association module for associating the three-dimensional finite element model of the transformer, the material parameter model, and the transmission parameter model to obtain an electromagnetic model of the transformer; and determining a simulation circuit of a DC / DC converter based on the electromagnetic model of the transformer, a preset MOSFET switch tube active device model, and a preset inductor and capacitor passive device model; A simulation test module, configured to perform a simulation test on the simulation circuit of the DC / DC converter according to a preset simulation frequency to obtain a DC / DC converter simulation result; and determining whether the DC / DC converter simulation results meet the preset electromagnetic compatibility performance rules. If not, modifying the transformer three-dimensional finite element model and performing simulation tests based on the modified DC / DC converter simulation circuit until the simulation results meet the preset electromagnetic compatibility performance rules; If the conditions are met, the transformer electromagnetic model corresponding to the DC / DC converter simulation result is output as the final transformer electromagnetic model.

7. The device according to claim 6, characterized in that The model building module is also used to determine the size parameters of the winding and the magnetic core according to the specification data of the transformer, build the winding constructed by wires or PCB traces according to the size parameters of the winding and the magnetic core, and perform solid modeling to obtain a three-dimensional finite element model of the transformer.

8. The device according to claim 7, wherein The model building module is also used to obtain material information of conductors, dielectrics, magnetic cores and shielding materials based on transformer material parameters, and convert the material information of conductors, dielectrics, magnetic cores and shielding materials into a material parameter model that defines the conductors, dielectrics and magnetic cores in the transformer.

9. The device according to claim 8, wherein The model building module is also used to determine the boundary conditions of the DC / DC converter in the circuit based on the position data of each external device connected to the DC / DC converter in the circuit, determine the parasitic parameters of each position based on the boundary conditions, and output the parasitic parameters of each position as a transmission parameter matrix as a transmission parameter model.

10. The device according to claim 9, wherein The simulation test module is further configured to determine an electromagnetic compatibility performance problem node based on a comparison result between the DC / DC converter simulation result and the preset electromagnetic compatibility performance rule when the DC / DC converter simulation result does not meet the preset electromagnetic compatibility performance rule; Modify the size parameters of the winding or core in the three-dimensional finite element model of the transformer according to the electromagnetic performance problem node to obtain a modified three-dimensional finite element model of the transformer; Associating the modified three-dimensional finite element model of the transformer, the material parameter model, and the transmission parameter model to obtain a modified electromagnetic model of the transformer; The modified DC / DC converter simulation circuit is determined based on the modified transformer electromagnetic model, the preset MOSFET switch tube active device model and the preset inductor and capacitor passive device model, and the modified DC / DC converter simulation circuit is simulated and tested according to the preset simulation frequency to obtain simulation results.

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