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High Speed DC Circuit Breaker

IP.com Disclosure Number: IPCOM000090971D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Melnyk, G: AUTHOR

Abstract

A high-speed circuit breaker for DC circuits utilizes transistors T1 and T2 connected so that T2 normally provides the base drive for T1 which carries the load current. Silicon controlled rectifier SCR is connected to substantially short the base-emitter junctions of T1 and T2 when it turns on. R1 is a current sensing resistor in the load circuit with T1. R2 and R3 form a voltage divider which controls the value of current for which SCR turns on. When the current in R3 exceeds the selected value, SCR turns on and transistors T1 and T2 are turned off. The load current is bypassed through fuse F, causing it to blow quickly and interrupt the current.

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High Speed DC Circuit Breaker

A high-speed circuit breaker for DC circuits utilizes transistors T1 and T2 connected so that T2 normally provides the base drive for T1 which carries the load current. Silicon controlled rectifier SCR is connected to substantially short the base-emitter junctions of T1 and T2 when it turns on. R1 is a current sensing resistor in the load circuit with T1. R2 and R3 form a voltage divider which controls the value of current for which SCR turns on. When the current in R3 exceeds the selected value, SCR turns on and transistors T1 and T2 are turned off. The load current is bypassed through fuse F, causing it to blow quickly and interrupt the current.

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