| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 107 === The thesis focuses on design and implementation of a bidirectional converter with symmetrical resonant tank in high power-density condition. To compare with traditional resonant converter, the new structure with symmetrical resonant tank and using synchronous controlled on primary-side and secondary-side switches, and by the current of additional inductor helps the secondary-side switches achieve the zero-voltage switching (ZVS) operation, also reduces the switching loss and improve the efficiency. Firstly, the analysis of circuit theories and operation principles are discussed. Considering application for dc transformer, the requirement of ZVS operation, design of resonant tank, and controlled signal of switches of purpose converter and traditional resonant converter are compared. Besides, the design and selection of power MOSFET, gate driver, resonant tank, and circuit layout are purposed. Finally, an 18kW prototype circuit was implemented, the size of converter is 160 x 100 x100 mm, power density is 11.25W/cm^3, and the operation frequency is 300kHz.Under the high input voltage condition, the efficiency 98.3% at 50% load, and 98.2% at full load. Under the condition that direction of power flow changed, the current flow of converter is also changed naturally, and the simulate results are verified with the experimental results.
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