Study on Integrated Magnetics for PFC Inductor in Single-Phase Interleaved PFC Converter

doi:10.16628/j.cnki.2095-8188.2026.05.010

Abstract

Abstract:

PFC inductor is the core component of power factor correction circuit,which directly affects the power density of PFC converter.Based on a three-way interleaved parallel PFC converter,the coupling integration of PFC inductors is investigated.Based on the analysis of the working principle of the circuit and the equivalent decoupling analysis of the coupled integrated PFC converter,the key influencing factors of the equivalent inductance and steady-state inductance of the input current ripple were clarified.The design goal of reducing the volume of the magnetic component was set under the condition of constant input current ripple.The quantitative relationship between the inductance current ripple ratio,duty cycle,and coupling coefficient was theoretically derived.We have established equivalent magnetic circuit models for DC magnetic flux analysis and AC magnetic flux analysis,clarified the distribution characteristics of AC and DC magnetic flux,as well as the mapping law of circuit magnetic circuit parameters,providing theoretical basis for the design of integrated PFC inductors,and determined the design scheme of coupling integration.Finally,the correctness of the theoretical analysis of magnetic integration design was verified through circuit magnetic joint simulation and experimental verification.

Key words: interleaved parallel connection, PFC inductor, magnetic integration, PFC converter

CLC Number:

TM476

SUN Yaxuan, LIU Chaohui, YE Xiaoli, WANG Jinpeng, LIN Subin. Study on Integrated Magnetics for PFC Inductor in Single-Phase Interleaved PFC Converter[J]. LOW VOLTAGE APPARATUS, 2026, 0(5): 69-77.

Figures/Tables 20

References 14

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电感电压	1	2	3	4	5	6
u_L₁	U_a	U_b	U_b	U_b	U_b	U_b
u_L₂	U_b	U_b	U_a	U_b	U_b	U_b
u_L₃	U_b	U_b	U_b	U_b	U_a	U_b

电感电压	1	2	3	4	5	6
u_L₁	U_a,U_a	U_a,U_a	U_a,U_a	U_b,U_a	U_b,U_a	U_b,U_b
u_L₂	U_b,U_a	U_b,U_b	U_a,U_a	U_a,U_a	U_a,U_a	U_b,U_a
u_L₃	U_a,U_a	U_b,U_a	U_b,U_a	U_b,U_b	U_a,U_a	U_a,U_a

k	匝数	电感因数/(H·N^-2)
k	匝数	边柱与磁轭(上下)	边柱气隙	中柱 (上下)	中柱气隙
-0.2	26	4.4×10^-5	5.0×10^-7	3.6×10^-4	1.51×10^-6
-0.3	30	3.7×10^-5	6.2×10^-7	2.8×10^-4	8.21×10^-7
-0.4	37	2.9×10^-5	8.7×10^-7	1.9×10^-4	4.36×10^-7
-0.2	34	2.7×10^-5	3.0×10^-7	1.6×10^-4	8.86×10^-7
-0.3	26	4.8×10^-5	8.2×10^-7	2.8×10^-4	1.09×10^-6

电感类型	输入电流纹波等效电感/μH	稳态等效电感/μH	一路电感电流纹波/A
分立电感	184.5	184.5	9.345
耦合集成电感	252.8	365.4	4.499