U.S. Philips Corporation

Oscar J Deurloo

Robertus A Keijser

Willem J Van Den Hoek

Franciscus H Lammers

Stefan E Roijers

Johannis A A Toonen

Aswin J Linden

Arthur Kimmels

A circuit arrangement for igniting and operating a high-pressure discharge lamp includes input terminals for the connection of a supply source and output terminals for the connection of the lamp. A switching circuit operates the lamp at a nominal lamp voltage Vla during stable lamp operation and generates an open circuit voltage Vo at the output terminals before the lamp is ignited. A control circuit for controlling the switching circuit is provided with a device BM for limiting the voltage at the output terminals. A transition detection circuit M detects the transition from a glow discharge to an arc discharge.

Protection device in a hid lamp ignition circuit

A discharge vessel with a ceramic wall is filled with inert gas and metal and is ignited and operated by an electronic circuit including a half bridge converter with an LC circuit which, when the lamp is not ignited, enters an oscillation state near a resonance frequency which lies near the third harmonic of the switching frequency of the half bridge converter. The vessel encloses a cylindrical discharge space of diameter D and length L, wherein L.ltoreq.D.ltoreq.1.2 L.

High-pressure discharge lamp with miniature discharge vessel and

The invention relates to a circuit arrangement for igniting and operating a high-pressure discharge lamp provided with a control circuit which limits the voltage to a value Vb across the output terminals of the circuit arrangement such that:

Discharge lamp igniting and operating circuit with a timer controlled

A circuit arrangement for igniting and operating a discharge lamp is provided with

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Eindhoven, Netherlands

Oscar J Deurloo