New constant frequency PWM dual convertor with synchronous rectifier

A new constant frequency PWM dual convertor which has fully regulated dual outputs is proposed. The proposed convertor is the superposition of a forward convertor and a flyback convertor. The switches in the forward convertor for synchronous rectification provide another degree of freedom in controlling the flyback convertor. Thus, not only forward output but also flyback output can be fully regulated by constant frequency PWM control in continuous conduction mode (CCM).