Design and Control Strategy for Autonomous and Seamless Mode Transition of High Efficiency Bidirectional DC-DC Converter for ISG Systems

ISG 시스템용 고효율 양방향 DC-DC 컨버터의 설계 및 자율적이며 끊김없는 모드전환을 위한 제어전략

Park, Jun-Sung;Kwon, Min-Ho;Choi, Se-Wan

  • Received : 2015.07.31
  • Accepted : 2015.11.24
  • Published : 2016.02.20


In this study, a bidirectional DC-DC converter for idle stop and go (ISG) is developed to reduce fuel consumption. A three-phase non-isolated half-bridge converter is selected through a design method by considering efficiency and volume. According to the state of charge of the batteries at both the low-voltage and high-voltage sides, buck mode, which charges a low-voltage battery from the generated motor energy, and boost mode, which provides power to the motor from the low- and high-voltage battery sides, are required in the ISG system. Hence, an autonomous and seamless bidirectional control method using a variable current limiter is proposed for mode change. A 1.8 kW engineering sample of the proposed converter has been built and tested to verify the validity of the proposed concept. The maximum efficiencies, including gate driver and control circuit losses, are 96.4% in charging mode and 96.1% in discharging mode.


BDC(Bidirectional DC-DC Converter);Buck converter;Boost converter;Interleaved;ISG


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