Fault current recognition circuitry

US5909348A · kind A · utility

Assignee

• ITT MANUFACTURING ENTERPRISES LLC · US

Inventors

• Michael Zydek · Langgöns, DE
• Wolfgang Fey · Niedernhausen, DE
• Mario Engelmann · Rheinböllen, DE
• Olaf Zinke · Hersbruck, DE

Key dates

• Filing date: Mar 5, 1998
• Grant date: Jun 1, 1999
• Expiry date: Mar 5, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/72
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A circuitry for detecting a fault current or leakage current on the supply line of an electronic circuit includes a current source which is rated for a maximum allowed fault current or leakage current. The current source is fed by an auxiliary voltage source. The potential on the supply line which prevails when the supply voltage is disconnected due to the leakage current is determined and assessed by a potential monitor.