Patent Number: 6,294,880

Title: Protection device in a hid lamp ignition circuit

Abstract: 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.

Inventors: Deurloo; Oscar J. (Eindhoven, NL), Toonen; Johannis A. A. (Eindhoven, NL)

Assignee: U.S. Philips Corporation

International Classification: H05B 39/00 (20060101); H05B 41/28 (20060101); H05B 37/02 (20060101); H05B 37/00 (20060101); H05B 39/04 (20060101); H05B 41/288 (20060101); H05B 41/18 (20060101); H05B 41/00 (20060101); H05B 037/02 ()

Expiration Date: 09/25/2018