Browse Prior Art Database

Protective Circuit

IP.com Disclosure Number: IPCOM000098967D
Original Publication Date: 1962-Feb-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 19K

Publishing Venue

IBM

Related People

Ruehli, A: AUTHOR

Abstract

The circuit provides protection for semiconductors against either overloading or destruction, due to applied power voltages being either too high or of wrong polarity.

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Protective Circuit

The circuit provides protection for semiconductors against either overloading or destruction, due to applied power voltages being either too high or of wrong polarity.

A power supply unit 11 is connected via a fuse 12 to a load 13 comprising semiconductors. A Zener power diode 14 is connected parallel with the input terminals of the load. Under normal conditions, i.e., if the power supply voltage is of predetermined amplitude and has a correct polarity, no current flows through the Zener diode.

However, if the power supply voltage reaches or surpasses the breakdown voltage of 14, a high current flows through 14 causing the fuse to blow. If the polarity of the power supply voltage is reversed, the diode 14 also conducts. The high current, which flows for a short time through the diode, again causes the fuse to blow.

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