Browse Prior Art Database

SEMICONDUCTOR SWITCH/CIRCUIT BREAKER w/LOAD DETECTOR

IP.com Disclosure Number: IPCOM000005565D
Original Publication Date: 1985-Oct-01
Included in the Prior Art Database: 2001-Oct-16
Document File: 2 page(s) / 78K

Publishing Venue

Motorola

Related People

Robert C. Kane: AUTHOR

Abstract

Recant advancements in MOSFET technology have made high current semi-conductor switches an attractive alternative to the existing mechanical and electro-mechanical devices. The extremely low drain-to-source resist- ance of the MOSFET device translates into reduced loss in the switching device thereby providing a wider range of circuit applications.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 55% of the total text.

Page 1 of 2

MOlVROLA Technical Developments Volume 5 October 1985

SEMICONDUCTOR SWITCH/CIRCUIT BREAKER w/LOAD DETECTOR

by Robert C. Kane

STATEMENT OF PROBLEM

   Recant advancements in MOSFET technology have made high current semi-conductor switches an attractive alternative to the existing mechanical and electro-mechanical devices. The extremely low drain-to-source resist- ance of the MOSFET device translates into reduced loss in the switching device thereby providing a wider range of circuit applications.

In addition to applications as electronic high current switches these devices may be implemented as current limiters and circuit breakers when accompanied by the appropriate control circuitry.

   The use as a semiconductor circuit breaker is of interest in that it poses additional demands on the controlling circuitry not normally required of "limiter" or "foldback" type applications. These existing circuits typically permit a short-circuit current to flow into an overload. This condition is not permitted for proper circuit breaker operation.

Additionally, electro-mechanical and mechanical circuit breakers, which do provide a positive load disconnect during high currant/overload conditions, must be manually reset, either directly or indirectly.

SOLUTION

   Proper operation of the semiconductor switch as a circuit breaker can be realized with the addition of a LOAD DETECTOR circuit. The LOAD DETECTOR is active only after an over-currant condition has bean detected in associated circu...