A nonisolated three-level bidirectional DC-DC converter

A new nonisolated three-level bidirectional dc-dc converter (TLBDC) is introduced in the paper. Compared with the existing TLBDCs, the proposed TLBDC shows superior performance, including a large conversion ratio, small voltage stresses across all components, common ground for input and output terminals, and automatic current balancing function for inductor currents. A closed control strategy including a voltage loop and a voltage balance loop is also developed. Experimental results confirm the validity of the proposed converter and the closed loop control strategy.