Fluorescent-lamp excitation circuit with frequency and amplitude

Details Fluorescent-lamp excitation circuit with frequency and amplitude Fluorescent-lamp excitation circuit with frequency and amplitude

1998-11-23

2000-07-11

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315209R, 315224, G05F 100

Patent

active

060877871

ABSTRACT:
A power-supply and control circuit is provided for driving a fluorescent lamp from a low-voltage direct current (DC) power source such as a battery. The circuit includes a converter that converts low-voltage DC to high voltage alternating current (AC). The converter includes a feedback ceramic step-up transformer that amplifies the AC signal to a level sufficient to illuminate the lamp, and also provides a feedback signal that can be used to monitor the resonance frequency of the transformer. The power supply and control circuit also includes a first feedback loop that regulates the lamp current amplitude and a second feedback loop that forces the converter to operate at the transformer's resonant frequency.

REFERENCES:
patent: 4851739 (1989-07-01), Nilssen
patent: 5313142 (1994-05-01), Wong
patent: 5548189 (1996-08-01), Williams
patent: 5623188 (1997-04-01), Bildgen
patent: 5648702 (1997-07-01), Choi et al.
patent: 5929718 (1999-07-01), Crosby

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