Piezoelectric transformer discharge lamp operating circuit with

Details Piezoelectric transformer discharge lamp operating circuit with Piezoelectric transformer discharge lamp operating circuit with

1998-06-08

2000-07-18

Vu, David

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315276, 315307, H05B 3702

Patent

active

06091209&

ABSTRACT:
A circuit arrangement for operating a lamp comprising input terminals for connection to a supply voltage source. A DC-AC converter is coupled to said input terminals for generating a high frequency signal. A piezoelectric transformer having a primary side that is coupled to the DC-AC converter and a secondary side that is coupled to terminals for lamp connection and a dimming circuit for adjusting the light output of the lamp. The DC-AC converter generates a substantially square wave shaped signal and the dimming circuit is coupled to the DC-AC converter for adjusting the lamp light output by adjusting the duty cycle of the substantially square wave shaped signal. A lamp operated by the circuit arrangement is dimmable over a wide range while the amount of power dissipated in the circuit arrangement is relatively low, even when the lamp is dimmed.

REFERENCES:
patent: 4864482 (1989-09-01), Quazi et al.
patent: 5329200 (1994-07-01), Zaitsu

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