Study on resonant fly-back converter for DC distribution system

This paper describes a resonant fly-back converter with thyristor switches, which can be used for the DC distribution with a PWM voltage-source inverter. The proposed converter operates to change high-voltage DC into low-voltage DC with isolation and large converting ratio. The converter has a main thyristor switch and an LC resonant circuit with an auxiliary thyristor switch for commutation in the primary side of the gap transformer. The operation of the proposed converter was verified through computer simulations with EMTP and experiments with a hardware scaled-model. The proposed converter could be implemented with commercially available components and proven technologies for supplying electricity to the rural or remote customer.