摘要

本論文旨在研究一具有電流抑制功能之開關電路，於短路故障發生時，過大的短路電流將造成元件及系統損壞。從絕緣閘雙極電晶體(IGBT)之輸出特性可知，其射極電流與其之飽和電壓有正向關係，而當其操作於活性區域(Active region)時，射極電流能被抑制，並且與閘極電壓有關。將上述特性整合至IGBT之驅動電路中，新式的保護開關將被提出。
此保護開關電路藉由將IGBT操作於活性區中，將能使故障電流被抑制，與傳統機械式保護方式相比，能在更短的時間內反應，能在故障電流上升至極大值前將故障排除。可減輕直流系統短路電流之消弧難度，於交流系統中，無需延時即可關斷故障電流，降低設備耐受故障電流之標準，降低成本及提高可靠度。
在本篇論文中，此短路保護開關被用於直流及交流之應用，分別於一數位控制之換流器，以及固態斷路器中，並且實作出。此電路能實現短路保護、電流抑制、自動復歸等功能。

Abstract

This thesis mainly studies on a switch circuit with current limitation. When short circuit fault occurs, high short circuit current may damage devices and system. According to output characteristic of IGBT, collector current is proportional to its saturation voltage, and can be limited at a safe value while IGBT operating in active region, and it is related gate-to-emitter voltage. Integrate these characteristics to driver circuit of IGBT, a novel protection switch circuit is proposed.
This protection switch circuit can inhibit fault current by operating IGBT in active region. Comparing with the conventional mechanical protection, it has a shorter response time, and can clear fault before fault current increases to maximum value. Eliminating difficulty of arc suppression of short current in a DC system. In a AC system, there is no delay to shut off the fault current. Standard of fault current withstanding for devices will be lower. Thus, cost can be reduced and reliability can be enhanced.
In this thesis, this short circuit protection switch will be implemented to DC and AC applications. One is a digital control inverter, and the other is grid-connected solid state circuit breaker. These circuits can achieve short circuit protection, short circuit current limiting, and auto restarting.

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