Integrated magnetics for boost PFC and flyback converters with phase-shifted PWM

This paper deals with an integrated magnetic design for the boost PFC and flyback converters with single magnetic core. A phase-shifted PWM technique is proposed to reduce the maximum flux density of the shared magnetic paths of the core. The proposed technique provides the advantage of minimizing the cross sectional area of the shared core limbs required to avoid the flux saturation, which results in the size reduction and cost down of the magnetic core. The principle and operation of the IM design and proposed PWM technique are presented for the boost PFC and flyback converters with single magnetic core. The simulation and experimental results are provided to verify the effectiveness of the proposed method.