Inventer-ballast using a piezoelectric transformer

Details Inventer-ballast using a piezoelectric transformer Inventer-ballast using a piezoelectric transformer

1998-08-26

2000-08-15

Philogene, Haissa

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315219, 315224, H05B 3702

Patent

active

061041416

ABSTRACT:
A circuit arrangement for operating a lamp has circuit input terminals for connection to a supply voltage source. An inverter is coupled to the circuit input terminals for generating an AC voltage with a frequency f from a supply voltage supplied by the supply voltage source and includes inverter output terminals. A piezotransformer has input terminals coupled to the inverter output terminals. Terminals for lamp connection are coupled to the inverter output terminals. A detector detects whether the lamp has ignited. The transformer input terminals are connected to the inverter output terminals only by means of passive components and the inverter comprises means coupled to the detector for changing the frequency f in response to the ignition of the lamp. The circuit arrangement is simple and inexpensive and need not provide a device for switching the piezotransformer out of the circuit after ignition of the lamp.

REFERENCES:
patent: 5670849 (1997-09-01), Melai
patent: 5677602 (1997-10-01), Paul et al.
patent: 5705897 (1998-01-01), Hanazaki et al.
patent: 5786671 (1998-07-01), Lee
patent: 5796213 (1998-08-01), Kawasaki
patent: 5834907 (1998-11-01), Takehara

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