A circuit for power transfer between a DC circuit and a DC voltage circuit has a bridge circuit comprising diodes and semiconducting switches, supplied from a DC source or battery. The bridge acts as an inverter and outputs to a transformer. The transformer feeds into a similar circuit acting as a rectifier. The semiconducting switches on each side have a control unit. The functions of the rectifier and inverter can be reversed on each side so that the power flow is bidirectional. .
