Fluorescent lamp driver

Details Fluorescent lamp driver Fluorescent lamp driver

1986-04-03

1987-04-14

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

315DIG2, 315DIG5, H02M 3335, H05B 4136

Patent

active

046583432

ABSTRACT:
A fluorescent lamp driver employs a saturable reactor switch for producing a high-frequency, substantially symmetrical drive signal for igniting and driving a fluorescent lamp. The drive signal is applied to the filaments of a fluorescent lamp using a resonant drive circuit whose components are series resonant near the frequency of the substantially symmetrical drive signal. Before ignition, the resonant drive circuit applies substantially the entire drive signal voltage in series with the filaments as well as across the fluorescent lamp. Thus, the filaments are heated to release electrons which ionize the inert gas to initiate a gas discharge in the lamp. The high-frequency drive signal thenceforth maintains the gas discharge without permitting time for the ionized gas to recombine between half cycles of energization.

REFERENCES:
patent: 4127798 (1978-11-01), Anderson
Build DC/DC Converters That Work, Electronic Design, vol. 23, No. 11, May 24, 1975, pp. 82-86.

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