Apparatus for controlling power to a load such as a fluorescent

Details Apparatus for controlling power to a load such as a fluorescent Apparatus for controlling power to a load such as a fluorescent

1989-12-12

1991-08-27

Laroche, Eugene R.

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315307, 315DIG4, H05B 3702, H05B 4136

Patent

active

050436350

ABSTRACT:
A power controller device used for dimming fluorescent lights includes a power supply circuit for producing a rectified AC power output, a start pulse generator for producing a start pulse in response to the power output, and a switch energized in response to the start pulse to deliver power to the load. A phase detector is connected with the power supply for generating a synchronized saw-tooth voltage waveform from the rectified power output and a power level control circuit is connected with the power supply for setting a voltage threshold level for controlling the power level supplied to the load. A run pulse generator is connected with the phase detector and the power level control circuit and produces run pulses when the saw-tooth voltage waveform from the phase detector exceeds the voltage threshold level. Timer and restart circuits are also provided. The timer circuit disables the power level control circuit for a pre-determined warm-up period wherein full power is delivered to the light for start-up. The restart circuit is operable to activate the timer circuit following a brief power failure to restart the lights.

REFERENCES:
patent: 4286196 (1981-08-01), Auer
patent: 4287468 (1981-09-01), Sherman
patent: 4346331 (1982-08-01), Hoge
patent: 4379254 (1983-04-01), Hurban
patent: 4414493 (1983-11-01), Henrich
patent: 4477748 (1984-10-01), Grubbs
patent: 4800330 (1989-01-01), Pelonis
patent: 4937504 (1990-06-01), Black, Jr. et al.
patent: 4949020 (1990-08-01), Warren et al.

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