Characteristic evaluation for bi-directional DC-DC converter with soft switching

In recent years, power generation utilizing solar power or wind power which generation ripple is large has been being great attractive for effective utilization of electrical energy. This report presents an evaluation of an isolated bi-directional DC-DC converter composed of a bi-directional boost chopper circuit and full-bridge-type LLC converter. As an evaluation method, a circuit which has two different types of voltage spec and electric power capacity is covered, and the confirmation of circuits operation and waveforms, measurement of conversion efficiency, and loss analysis are carried out. Furthermore, it is confirmed that the conversion efficiency changes when the switching timing which affects ZVS level changes.