Simulation of Dynamic Hysteresis Characteristics of High Frequency Transformer Core Under Non-sinusoidal Excitation
The high-frequency transformer is the core component of the DC/DC converter.Its excitation waveform is generally non-sinusoidal,and the operating frequency can reach more than thousands of hertz,resulting in a significant increase in core loss.Accurately simulating the dynamic hysteresis characteristics of the high-frequency transformer core under non-sinusoidal excitation is helpful for the calculation of core loss and the electromagnetic transient analysis of the transformer.In this paper,firstly,considering the physical process of core magnetization,the static hysteresis permeability model of core based on static J-A hysteresis model and permeance-capacitance analogy method is established by using the bottom module and language in the system-level power electronic simulation software PLECS.Then,considering the influence of eddy current effect and relaxation effect on the dynamic hysteresis characteristics of the core under high-frequency conditions,the dynamic hysteresis permeance model of the core is established according to the loss statistical theory.Finally,the static J-A hysteresis model parameters are extracted based on the hybrid algorithm of Simulated Annealing and Levinberg-Marquardt,and the dynamic loss coefficient is extracted by the least square method according to the core loss characteristic curve.The simulation results and experimental results of current waveform and hysteresis loop under different duty cycles and high-frequency square wave voltage excitation are compared and analyzed,which verifies the effectiveness of the model.
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