基于单相交错式PFC变换器的磁集成PFC电感研究OA

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.