High ratio bidirectional DC-DC converter with a synchronous rectification H-bridge for hybrid energy sources electric vehicles

Yun Zhang, Yongping Gao, Jing Li, Mark Sumner, Ping Wang, Lei Zhou

Research output: Journal PublicationArticlepeer-review

7 Citations (Scopus)

Abstract

In order to match the voltages between high voltage battery stacks and low voltage super-capacitors with a high conversion efficiency in hybrid energy sources electric vehicles (HESEVs), a high ratio bidirectional DC-DC converter with a synchronous rectification H-Bridge is proposed in this paper. The principles of high ratio step-down and step-up operations are analyzed. In terms of the bidirectional characteristic of the H-Bridge, the bidirectional synchronous rectification (SR) operation is presented without any extra hardware. Then the SR power switches can achieve zero voltage switching (ZVS) turn-on and turn-off during dead time, and the power conversion efficiency is improved compared to that of the diode rectification (DR) operation, as well as the utilization of power switches. Experimental results show that the proposed converter can operate bidirectionally in the wide ratio range of 3~10, when the low voltage continuously varies between 15V and 50V. The maximum efficiencies are 94.1% in the Buck mode, and 93.6% in the Boost mode. In addition, the corresponding largest efficiency variations between SR and DR operations are 4.8% and 3.4%. This converter is suitable for use as a power interface between the battery stacks and super-capacitors in HESEVs.

Original languageEnglish
Article numberJPE 16-6-5
Pages (from-to)2035-2044
Number of pages10
JournalJournal of Power Electronics
Volume16
Issue number6
DOIs
Publication statusPublished - 2016

Keywords

  • Bidirectional DC-DC converter
  • H-bridge
  • HESEVs
  • High ratio
  • Synchronous rectification

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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