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The Hybrid Electric Vehicle (HEV) is the first step in reducing the environmental impacts of automobile use without losing comfort, performance and extended driving range. The success of the transition to Hybrid Vehicles depends on battery capabilities, converter system and cost. This paper proposes a new isolated Dual bridge Four-level pulse width modulated dc-dc converter (DBPWMC) with small inductance and no dead time operation for Energy storage system (composed of several Batteries) of Electric/ Hybrid Electric Vehicle. With no dead time operation, energy is continuously transmitted from input DC source to Battery in whole switching period, which causes lower input ripple current and hence the smaller size input filter. Detailed analysis shows the proposed converter can have either lower voltage stress on all primary side power switches or soft switching properties when different driving schemes are applied. The 48V/100-W DC - DC to converter with PWM oscillator with a frequency of 20 KHz has been tested for the verification of the principle. The simulation and experimental results ensure the feasibility and advantages of the new approach.
Date of Conference: 22-24 Sept. 2011