| Summary: | 碩士 === 國立高雄應用科技大學 === 電機工程系博碩士班 === 101 === In this thesis, a novel high step-up boost converter with non-isolator type is proposed. This circuit topology of the proposed converter is composed of three conventional converters: boost, sepic and forward converters with cascade connect such that a high step-up voltage gain with an appropriate duty ratio can be obtained. Besides, the converter has the advantages that the leakage inductance energy can be recycled, and the voltage stress and power loss can be reduced with a passive voltage clamp characteristic. In addition, the reverse-recovery problem of the diode is alleviated. It can be applied to renewable energy systems. The operating principles and steady-state analysis of the converter are presented. Finally, an experimental prototype with 24~36 V input and 200 V/ 150 W output is implemented to verify the theoretical analysis of the proposed converter. The maximum efficiency of 93.8% is reached; the full load efficiency remains at 90.2%.
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