Fluorescent lamp controllers

Details Fluorescent lamp controllers Fluorescent lamp controllers

1991-08-12

1992-05-05

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Automatic regulation

315244, 315308, 315DIG2, H05B 4136

Patent

active

051111187

ABSTRACT:
A controller operates in pre-ignition and ignition phases to obtain stable and reliable control of operation of a half-bridge DC-AC converter in a frequency range which is offset from a resonant frequency of an output circuit which includes a transformer and capacitors and which couples the converter to a fluorescent lamp load. The converter is supplied with a DC voltage from a switched-mode DC-DC supply of a pre-conditioner circuit which responds to a full-wave rectified AC voltage and which is supplied with pulse-width modulated gating pulses from the controller, preferably at a frequency which is the same as that of the converter. The controller monitors signals from the output circuit and pre-conditioner circuits and exercises control to reliable starting and highly efficient lamp operation and to obtain an in-phase proportional relationship of input voltage and current wave forms.

REFERENCES:
patent: 4495446 (1985-01-01), Brown
patent: 4572988 (1986-02-01), Handler
patent: 4698554 (1987-10-01), Stupp
patent: 4700113 (1987-10-01), Stupp
patent: 4717863 (1988-01-01), Zeiler
patent: 4723098 (1988-02-01), Grubbs
patent: 4893059 (1990-01-01), Nilssen
patent: 4896077 (1990-01-01), Dodd
patent: 4935669 (1990-06-01), Nilssen
patent: 5048033 (1991-09-01), Donahue
patent: 5049790 (1991-09-01), Herfurth

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