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21	Ultracapacitor/Battery Hybrid Energy Storage Systems for Electric Vehicles Moshirvaziri, Mazhar 22 November 2012 (has links) This thesis deals with the design of Hybrid Energy Storage System (HESS) for Light Electric Vehicles (LEV) and EVs. More specifically, a tri-mode high-efficiency non-isolated half-bridge converter is developed for the LEV based HESS applications. A 2 kW, 100 V interleaved two-phase converter prototype was implemented. The peak efficiency of 97.5% and a minimum efficiency of 88% over the full load range are achieved. Furthermore, a power-mix optimizer utilizing the real-time Global Positioning System (GPS) data for the EV based HESS is proposed. For a specific design, it is shown that at the cost of less than 1.5% of the overall energy savings, the proposed scheme reduces the peak battery charge and discharge rates by 76% and 47%, respectively. A 30 kW bi-directional dc-dc converter is also designed and implemented for future deployment of the designed HESS into a prototype EV, known as A2B. Ultracapacitor Battery Electric Vehicle Hybrid Energy Storage System Light Electric Vehicle Half-bridge Converter DC-DC Converter Quasi Resonant Pulse Frequency Modulation Variable Frequency Quasi-resonant Zero Voltage Switching High Efficiency Power Mix Optimizer Global Positioning System GPS Bi-directional DC-DC Converter A2B Project EVE 0544