Power supply circuit for gas discharge lamps operating at a resonant frequency

US5298836A · kind A · utility

Assignee

• Diehl GmbH & Co. · DE

Inventors

• Peter Backmund · Nuremberg, DE
• Gottfried Stockinger · Eckental, DE
• Helmut Losel · Brensbach, DE

Key dates

• Filing date: Aug 12, 1992
• Grant date: Mar 29, 1994
• Expiry date: Aug 12, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S315/07
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A power supply circuit for any kind of loads or power consuming devices which are connected to an electrical power supply; especially lamps, such as at least one glow or gas discharge lamp, wherein a pulse width modulator controls electronic switches of a push-pull oscillator, and wherein the pulse frequency of the pulse width modulator is tuned to the resonant frequency of a resonant transformer of the push-pull oscillator which has the secondary side thereof connected to the gas discharge lamp. A control circuit monitors a current and/or voltage value and/or time value which is characteristic for the presence of the resonance and which, upon a change in the resonant frequency, will change the pulse frequency of the pulse width modulator to ensure operation at the new resonant frequency.