Proposal of ultra high efficient energy conversion system (HEECS) for electric vehicle power train

Recently, vehicles such as hybrid electric vehicle (HEV) and electric vehicle (EV) are actively researched. This paper focuses on EV with a DC-DC converter. EV is inefficient as the battery supplies all power through the DC-DC converter all the time. This paper proposes a high efficient energy conversion system (HEECS) using two batteries: a main battery and a sub battery. The main battery supplies fundamental power without passing through the DC-DC converter. The sub battery supplies additional power through the DC-DC converter. High efficiency of 99.6 % was experimentally confirmed in this paper. Proposed high efficient energy conversion system (HEECS) makes it possible to improve the running distance per charge of EV.