Voltage supply with recovery protection for a thyristor

US4873620A · kind A · utility

Assignees

• Metallgesellschaft AG · DE
• Siemens Aktiengesellschaft · DE

Inventors

• Franz Neulinger · Langen (Hessen), DE
• Helmut Schummer · Heusenstamm, DE
• Gerhard Donig · Erlangen, DE
• Walter Schmidt · Bellikon, CH

Key dates

• Filing date: Nov 10, 1983
• Grant date: Oct 10, 1989
• Expiry date: Nov 10, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S323/903
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A voltage supply for an electric filter is disclosed. The supply comprises a high-voltage rectifier, a pulsed voltage circuit including a resonant circuit and a parallel circuit of a thyristor and a diode which controls resonance in the resonant circuit. The thyristor is fired to trigger the resonant circuit and generate an oscillation which is delivered to the filter as a pulsed voltage. In order to prevent damage to the thyristor, it is fired whenever the duration of the current flowing through the diode is shorter than the thyristor recovery time.