Solid-state Circuit Breaker with Overload Current Limiting

• Main Authors: Te-ChangHung, 洪德彰
• Other Authors: Jiann-Fuh Chen
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/czn8qe

碩士 === 國立成功大學 === 電機工程學系碩士在職專班 === 104 === According to the characteristics of MOSFET, MOSFET can be operated in linear region, cut off region and saturation region. The proposed solid state circuit breaker utilizes the characteristics of MOSFET operating in saturation region . It offers a short tripping time and precise current limiting during overload current fault. The proposed solid state circuit breaker possesses the advantages of conventional circuit breakers, which offers a comprehensive protection to those devices that is sensitive to electric fault. There is no additional current limit inductor such as general fault current limiters. Therefore, the size of product is smaller than general fault current limiters. In this thesis, the operational principle of the circuit will be described in detail and simulation is presented. Then, a proposed solid state circuit breaker is implemented, the given specifications are AC 220V operating voltage, 30A nominal current capability and 45A peak current for protection. Finally, the experimental result shows that the proposed circuit breaker can perform a short tripping time which is 10µs and a precise current limiting which is limited to 90A. Therefore, the capability of proposed circuit breaker is shown to provide a comprehensive protection.