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US 6,184,634 B2Granted
Circuit arrangement for igniting and operating a lamp having piezoelectric transformer
AssigneeU.S. Philips Corporation
InventorsMartin Ossmann, Dieter Leers
Life of this patent
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Abstract
A circuit arrangement for supplying a lamp comprises a piezotransformer. During stationary operation the lamp is supplied via the piezotransformer. During ignition a DC-ignition voltage is generated over the secondary side of the piezotransformer acting as capacitor.
Claims4
Circuit arrangement for igniting and operating a lamp, comprising
- supply terminals for connection to a supply voltage source,
- a piezotransformer equipped with two input terminals and two output terminals,
- an oscillator, coupled with the supply terminals and the input terminals of the piezotransformer, for generating a periodical voltage,
- a load circuit equipped with terminals for lamp connection and coupled between the output terminals of the piezotransformer,
- characterized in that the circuit arrangement further comprises an igniter, coupled between the output terminals of the piezotransformer, for generating during ignition a DC voltage with an amplitude that is higher than the voltage that is present between the output terminals of the piezotransformer during stationary lamp operation.
2 more elements
Dependencies are inferred from the claim text.