Circuit for detecting the current flow of a triac

US4737671A · kind A · utility

Assignee

• Telefunken Electronic GmbH · DE

Inventors

• Karl-Diether Nutz · Oedheim, DE
• Willy Frank · Annaberg-Buchholz, DE

Key dates

• Filing date: Jun 25, 1986
• Grant date: Apr 12, 1988
• Expiry date: Jun 25, 2006

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R19/15
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A circuit for detecting current flow in a triac, wherein the circuit operates with only one operating voltage with one pole of this operating voltage being connected to a current terminal of the triac and simultaneously being the voltage reference point for the triac. The triac gate voltage fluctuating around the voltage reference point is used to detect the triac current flow, the gate voltage of the triac is transformed, if necessary, into the voltage range of the operating voltage of the detector circuit, and digital information is generated as a function of the gate voltage to indicate whether a load current is flowing in the triac or not.