Patent · US Expired

Discharge lamp operating circuit using piezoelectric transformer and protective device

US6111765A · kind A · utility

6Cited by

7References

19Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Hans G. Ganser · Stolberg, DE
Dieter Leers · Stolberg, DE
Klaus Lohn · Simmerath, DE
Martin Ossmann · Aachen, DE
Pieter Postma · Roosteren, NL

Key dates

Filing date	Aug 26, 1998
Grant date	Aug 29, 2000
Priority date	—
Expiry date	Aug 26, 2018

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S323/901
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A circuit for operating a discharge lamp having circut input terminals for connection to a supply voltage source and an inverter coupled to the circuit input terminals for generating an AC voltage at a frequency f from a supply voltage supplied by the supply voltage source. A piezotransformer has transformer input terminals coupled to the inverter output terminals. Terminals for lamp connection are coupled to the inverter output terminals and is provided for detecting whether the lamp has ignited. A protective device is coupled between the output terminals of the inverter and the transformer output terminals so that the inverter is effectively protected against damage due to ignition pulses generated by the piezotransformer.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.