A High-Efficiency Battery Charger with Cascode Output Design

• Main Authors: Po-Jung Tseng, 曾柏榮
• Other Authors: Yu-Kang Lo
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/62856142089433970853

博士 === 國立臺灣科技大學 === 電子工程系 === 102 === This dissertation presents a high-efficiency battery charger with cascode output design. The presented battery charger is designed for charging different battery banks, so the output voltage range is wider. By using cascode output voltage, the proposed scheme improves the transformer utilization and the efficiency performance under wide range output voltage. To show the feasibility and superiority of the proposed circuit, two conventional battery chargers are discussed and analyzed. Firstly, a single-stage topology is implemented by phase-shifted full-bridge converter. Secondly, a two-stage topology is implemented by full-bridge series-resonant converter and buck converter. The proposed cascode topology improves the efficiency performance compared with the two-stage topology. The output stage is a cascode structure comprising fixed voltage and variable voltage. The constant current and constant voltage charging schemes can be achieved by the proposed cascode configuration for battery charger applications. Two 3.3-kW laboratory prototypes of the single-stage scheme and the proposed topology are implemented and tested. The experimental results are shown to verify the feasibility of the proposed scheme.