Simplified Current Equivalent Model of Full Bridge CLLC Resonant Converter Under Over-Resonant Condition

doi:10.16628/j.cnki.2095-8188.2023.07.002

Abstract

Abstract:

The effective value and peak value of the resonant current are particularly important for the efficiency analysis and device selection of the converter.In response to the problem of low accuracy of using fundamental wave analysis method and complexity of using the time-domain analysis method to calculate resonant current, a new method is proposed.The waveform of resonant current in circuits with operating frequency greater than resonant frequency is analyzed and theoreticaly derived.At the same time, a simplified resonant current model is constructed based on the reasonable assumptions and equivalence of the current.The experimental results show that the simplified model is more accurate than the fundamental wave analysis method and the calculation is simple.

Key words: CLLC, resonant converter, over-resonant, resonant current model, loss analysis

CLC Number:

TM46

DAI Xiangyang, XU Yuzhen, WAN Lufeng. Simplified Current Equivalent Model of Full Bridge CLLC Resonant Converter Under Over-Resonant Condition[J]. LOW VOLTAGE APPARATUS, 2023, 0(7): 10-17.

Figures/Tables 14

References 20

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参数	取值
额定输入电压U_in/V	200
额定输出电压U_o/V	200
谐振电感L_r1、L_r2/μH	20
励磁电感L_m /μH	76
谐振电容C_r1、C_r2/nF	126.67
谐振频率f_r/kHz	100