Controlled electronic switching device for the suppression of transients

US4614962A · kind A · utility

Assignee

• SGS-Ates Componenti Elettronici S.p.A. · IT

Inventors

• Franco Bertotti · Milano, IT
• Paolo Ferrari · Gallarate, IT
• Mario Foroni · Valeggio sul Mincio, IT
• Sergio Garue · Peschiera Borromeo, IT

Key dates

• Filing date: Dec 3, 1984
• Grant date: Sep 30, 1986
• Expiry date: Dec 3, 2004

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10D62/148

Abstract

This controlled electronic switching device for the suppression of transients can change over from a non-conductive state to a conductive state at lower triggering current levels than conventional devices while retaining unaltered its response characteristics to variations in the voltage applied thereacross. The device comprises a main switch which is triggered by a parallel-connected auxiliary switch having smaller junction areas and a higher capacitive current shunt resistance (resistance between base and emitter) than the main switch, thereby it turns on at lower control currents from the gate electrode for a given response to voltage variations.