Abstract
In this paper, the major objective is to study a bidirectional hybrid power converter system to reduce the battery damage caused by the motor acceleration and deceleration. As a result, for a possible application, i.e. light electric vehicle (LEV) platform, the novel bidirectional converter is constructed to interface with ultracapacitor (UC), battery and DC-bus of motor drive. A multiport switch is introduced to control the bidirectional power flow and to switch the multimode operation (i.e. UC charge mode, battery charge mode, UC discharge mode, dual-source in series discharge mode, and battery discharge mode). Furthermore, to improve the conversion efficiency and to raise the voltage conversion ratio, the converter adopts the interleaved pulse-width modulation (PWM) control and coupled-inductor technique. The circuit operation principle and the steady-state analyses are performed. Finally, the hardware implementation of a 500W converter prototype is constructed and the feasibility can be verified by experimental results.
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