IPOP Double Resonant LLC Converter Based on Coupled Resonant Inductance

doi:10.16628/j.cnki.2095-8188.2022.07.002

Abstract

Abstract:

In low-voltage and high-power occasions,the system efficiency and reliability can be improved by the parallelled multiplexers.Aiming reducing the reliability of the system and limiting the application rang of the traditional double resonant LLC converter with the searies secondary winding of the transformer,an IPOP double resonant LLC converter with the parallel secondary windings of the converter is proposed.In order to solve the current sharing problem caused by inconsistent device parameters in the IPOP double resonant LLC converter,the two-phase resonant inductance is coupled to realize the automatic current sharing of the converter output.By establishing the FHA model and simulation analysis of the converter,the current sharing error distribution characteristics are studied when the resonance parameters are asymmetric,and the comparative experiments are verified the correctness of the theoretical analysis by building a 2.16 kW prototype.

Key words: dual resonant LLC converter, coupling inductance, IPOP, current sharing error

CLC Number:

TM46

TIAN Jian, XU Yuzhen. IPOP Double Resonant LLC Converter Based on Coupled Resonant Inductance[J]. LOW VOLTAGE APPARATUS, 2022, 0(7): 7-15.

Figures/Tables 21

References 11

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参数	数值	参数	数值
输入电压范围U_in/V	370~420	谐振电感L_r/μH	50
输出电压U_o/V	48	谐振电容C_r/nF	53
输出满载功率P_o/kW	2.16	变比n	4.37
谐振频率f_r/kHz	98	励磁电感L_m/μH	210

负载电流/A	谐振电流/A		输出电流/A		均流误差/%
负载电流/A	A相	B相	A相	B相	δ_res	δ_load
15	4.42	1.46	15	0	50.34	100
25	6.94	1.46	25	0	65.24	100
35	9.59	1.46	35	0	73.57	100
45	12.13	1.46	45	0	78.51	100

负载电流/A	谐振电流/A		输出电流/A		均流误差/%
负载电流/A	A相	B相	A相	B相	δ_res	δ_load
15	2.64	2.90	6.91	8.10	4.69	7.93
25	3.64	3.99	11.64	13.36	4.59	6.88
35	4.78	5.26	16.36	18.64	4.78	6.51
45	5.99	6.61	21.04	23.92	4.95	6.31

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