Title:
CIRCUIT ARRANGEMENT
Document Type and Number:
WIPO Patent Application WO1999012390
Kind Code:
A3
Abstract:
The invention relates to a circuit arrangement for operating a lamp comprising: circuit input terminals for connection to a supply voltage source, an inverter coupled to said circuit input terminals for generating an AC voltage with a frequency f out of a supply voltage supplied by the supply voltage source and equipped with inverter output terminals, a piezotransformer comprising transformer input terminals, coupled to the inverter output terminals, and transformer output terminals, terminals for lamp connection coupled to the inverter output terminals, a detector for detecting whether the lamp has ignited. In accordance to the invention the circuit arrangement is equipped with a protective device coupled between the output terminals of the inverter and the transformer output terminals. The inverter is effectively protected against ignition pulses generated by the piezotransformer.
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Inventors:
GANSER HANS GUENTER
LEERS DIETER
LOEHN KLAUS
OSSMANN MARTIN
POSTMA PIETER
LEERS DIETER
LOEHN KLAUS
OSSMANN MARTIN
POSTMA PIETER
Application Number:
PCT/IB1998/001312
Publication Date:
May 27, 1999
Filing Date:
August 21, 1998
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
PHILIPS PATENTVERWALTUNG (DE)
PHILIPS SVENSKA AB (SE)
PHILIPS PATENTVERWALTUNG (DE)
PHILIPS SVENSKA AB (SE)
International Classes:
H05B1/00; H05B41/24; H05B41/285; H05B41/288; H05B41/38; (IPC1-7): H05B41/24
Foreign References:
| EP0763966A2 | 1997-03-19 | |||
| US5548189A | 1996-08-20 |
Other References:
PATENT ABSTRACTS OF JAPAN, Vol. 18, No. 345, (E-1571), 29 June 1994; & JP 6089789 A (TOTO LTD) 29 March 1994.
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