Solid-state Circuit Breaker with Overload Current Limiting

Abstract

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 10?s and a precise current limiting which is limited to 90A Therefore the capability of proposed circuit breaker is shown to provide a comprehensive protection

Date of Award	2016 Sept 5
Original language	English
Supervisor	Jiann-Fuh Chen (Supervisor)