... of the switching frequency. Design/methodology/approach In this paper, the impedance model considering the parasitic parameters of the primary and secondary sides is calculated under light-load conditions, the limitations of the previous method are explained and a new circuit improvement is proposed...

... parameters of the secondary side diodes converted to the primary side, which will cause the voltage gain decreased when the switching frequency decreased. Design/methodology/approach This paper proposes an optimization parameters design method to solve this problem, which was based on impedance model...