Abstract. Analysis the conventional topology of Boost power factor corrector and input equivalent circuit and point out that conventional topology of Boost power factor corrector exists with improvement of converter power and the switching frequency. The efficiency of system is greatly reduced. The paper proposes a modified Power factor corrector ,analyzes the modified Boost circuit topology ,basic principle, analyzes the improved one-cycle control equation of the circuit, give the selection of parameters of the main components with theoretical basis, analyze the design of control system of the PI regulator in theory and calibrate the control system as typical Ⅱ type system, improve the anti-jamming ability and stability of the system, and make a prototype to prove the validity of theoretical results.
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