Transformer design method for LLC resonant converter
In the transformer design of LLC resonant converter, COMSOL's three-dimensional modeling and physics field simulation combined with intelligent algorithms for parameter optimization, the problems of insufficient simulation accuracy and poor design flexibility in the existing technology are solved, and a more efficient and reliable transformer design is achieved.
Patent Information
- Application Number
- CN202411970984.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-05-13
AI Technical Summary
In the transformer design of LLC resonant converters, it is difficult for the prior art to efficiently and accurately combine electromagnetic simulation and automatically adjust design parameters, resulting in insufficient simulation accuracy and poor design flexibility.
Three-dimensional modeling and physics simulation technology based on COMSOL are used, combined with intelligent algorithms (such as particle swarm algorithms) for parameter optimization iteration, and the key parameters of the transformer are automatically adjusted, such as turn ratios and core and coil sizes, to minimize iron and copper losses.
It improves simulation accuracy and design flexibility in the transformer design process, saves manpower, and helps improve the efficiency and reliability of the converter.
Smart Images
Figure CN119989564A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of converter parameter design, in particular to a transformer design method for an LLC resonant converter. Background Art
[0002] In modern power electronic systems, LLC resonant converter is a high-efficiency power converter. It is widely used in power conversion, energy management and other fields due to its advantages in high frequency, high efficiency and low switching loss. As an important core component in LLC, the design of the transformer directly affects the performance of the overall converter. In order to ensure the high efficiency and stability of the transformer during operation, reasonable parameter design and optimization are essential. However, traditional transformer design methods usually rely on analytical models and experimental data. Although this method can provide preliminary design solutions in some cases, it has the disadvantages of insufficient accuracy, long time and poor design flexibility in complex systems. Therefore, with the rapid development of computer technology, the design based on numerical simulation methods has gradually become the mainstream method for transformer parameter optimization.
[0003] COMSOL Multiphysics (hereinafter referred to as COMSOL) is a powerful multi-physics simulation software, which is widely used in many fields such as electrothermal, electromagnetic, fluid mechanics, etc. Using COMSOL for 3D modeling of transformers can more accurately simulate various complex factors in the actual working environment of transformers. For example, the electrical characteristics of transformers such as leakage inductance and excitation inductance are usually related to magnetic field distribution, geometric structure and material properties. Although the three-dimensional modeling and simulation technology based on COMSOL has made significant progress in many fields, in the transformer design of LLC converters, there are still challenges such as how to efficiently and accurately combine electromagnetic simulation and how to automatically adjust design parameters based on optimization algorithms. Therefore, further improving the simulation accuracy in the transformer design process is still a technical problem that needs to be solved urgently. Summary of the invention
[0004] In view of the above, the present invention proposes a transformer design method for an LLC resonant converter, including:
[0005] A 3D model of the transformer of the LLC resonant converter is established based on a set of default data. An intelligent algorithm is used to perform optimization iterations based on the key parameters provided. COMSOL physical field simulation is used to extract performance parameters such as transformer leakage inductance, excitation inductance, iron loss, and copper loss obtained after modeling in each iteration. After the optimal solution is finally obtained, the transformer is again 3D modeled and the performance parameters are calculated.
[0006] Optionally, the 3D modeling step and performance parameter extraction are based on modeling and physical field simulation performed by COMSOL Multiphysics.
[0007] Optionally, the parameter optimization step is designed based on a particle swarm algorithm.
[0008] Optionally, key parameters include but are not limited to transformer turns ratio, core and coil size, etc. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is a schematic diagram of the transformer parameter simulation optimization process for LLC resonant converter in the experimental example;
[0010] Figure 2 A schematic diagram of three-dimensional modeling of a transformer in an embodiment;
[0011] Figure 3 Schematic diagram of transformer equivalent circuit of an embodiment. DETAILED DESCRIPTION
[0012] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.
[0013] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.
[0014] A 3D model of the transformer of the LLC resonant converter is established based on a set of default data. An intelligent algorithm is used to perform optimization iterations based on the key parameters provided. COMSOL physical field simulation is used to extract performance parameters such as transformer leakage inductance, excitation inductance, iron loss, and copper loss obtained after modeling in each iteration. After the optimal solution is finally obtained, the transformer is again 3D modeled and the performance parameters are calculated.
[0015] The three-dimensional modeling steps and performance parameter extraction are based on modeling and physical field simulation performed by COMSOL Multiphysics.
[0016] The parameter optimization step is designed based on the particle swarm algorithm.
[0017] Key parameters include but are not limited to transformer turns ratio, core and coil size, etc.
[0018] The present invention will be further described below in conjunction with embodiments:
[0019] The method of the present invention, such as Figure 1 As shown, including:
[0020] S1. Establish the three-dimensional transformer model of LLC resonant converter, such as Figure 2 , the model is designed with a set of default parameters, including but not limited to transformer turns ratio, core and coil sizes, etc.
[0021] S2. Introduce the particle swarm algorithm and take the above parameters as design variables.
[0022] S3. Perform open circuit simulation and short circuit simulation on the transformer in the physical simulation software to obtain the corresponding leakage inductance, magnetizing inductance, iron loss and copper loss;
[0023] S4. Through the particle swarm algorithm, leakage inductance and excitation inductance are taken as constraints, and minimization of iron loss and copper loss is taken as the optimization goal for iterative optimization.
[0024] S5. The results obtained from the optimization iteration are re-modeled in three dimensions and physical field simulation is performed to verify the performance parameter indicators.
[0025] The present invention proposes a transformer parameter structure optimization design for an LLC resonant converter, which greatly saves manpower, helps to improve the efficiency and reliability of the converter, and has great engineering application value and promotion prospects.
[0026] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.
[0027] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that specifies the functions of a block or multiple blocks
[0028] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.
[0029] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application. Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.
Claims
1. A transformer design method for an LLC resonant converter, the method comprising: A transformer 3D model of the LLC resonant converter is established based on a set of default data; Use intelligent algorithms to perform optimization iterations based on the key parameters provided; In each iteration, COMSOL physical field simulation is used to extract performance parameters such as transformer leakage inductance, excitation inductance, iron loss and copper loss obtained after modeling; after the optimal solution is finally obtained, the transformer is three-dimensionally modeled again and the performance parameters are calculated.
2. According to the method described in claim 1, the three-dimensional modeling step is modeled based on COMSOL multi-physics field simulation software.
3. According to the method described in claim 1, the parameter optimization step is designed based on particle swarm algorithm.
4. According to the method described in claim 1, the key parameters include but are not limited to transformer turns ratio, core and coil size, etc.