| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 100 === This thesis presents the design and implementation of a 3.3kW programmable high efficiency battery charger for different battery specifications. The circuit topology is full-bridge series resonant converter (SRC) with dual-output design of 150V and 300V. The switching frequency of the developed full-bridge SRC circuit is modulated to regulate the 150V output voltage. The 300V voltage is supplied to a buck converter with pulse-width-modulation (PWM) control for achieving a wide-range adjustable output voltage, that is cascoded with the 150V voltage. Under Region-2 operation, the full-bridge SRC circuit not only has the inherent zero-voltage switching feature at primary side, but also has zero-current switching feature at secondary side. The switching losses can be reduced significantly and the overall efficiency can be improved. A constant voltage/constant current (CV/CC) control is implemented by using a digital-variable-resistor technique for buck converter for realizing programmable charging function. Finally, a 3.3kW laboratory prototype for the studied programmable high efficiency battery charger is built and tested to verify the feasibility of the proposed scheme. According to the experimental results, the overall efficiency can be up to 93%.
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