Patent · US Expired

Circuit for detecting the failure of a load which is connected in series with an electronic switch

US5266840A · kind A · utility

10Cited by

5References

6Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Ludwig Leipold · Munich, DE
Rainald Sander · Oberhaching, DE
Jenoe Tihanyi · Tauberbischofsheim, DE
Roland Weber · Munich, DE

Key dates

Filing date	Dec 31, 1992
Grant date	Nov 30, 1993
Priority date	—
Expiry date	Dec 31, 2012

Classification

Technology area (CPC H)Electricity
CPC primaryH05B47/20
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A circuit for detecting the non-operating condition of a load which is connected in series with an electronic switch wherein a comparator has a first input which is connected to the junction point between the load and the electronic switch and has a second input which is a reference voltage such that when the load fails the comparator produces an output to indicate such condition and wherein the reference voltage is lower than the normal voltage when the load is operating properly and is higher than when the load is in the inoperative condition.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.