Universal input dimmer interface

Details Universal input dimmer interface Universal input dimmer interface

1995-07-07

1998-05-12

Pascal, Robert

Electric lamp and discharge devices: systems

Current and/or voltage regulation

315DIG4, 315324, 363 78, 363 26, 363142, 307 21, H05B 3702

Patent

active

057511187

ABSTRACT:
A universal input dimming circuit for coupling an isolated external control signal into a variable output power supply, particularly those used for driving fluorescent lamps. Circuitry is incorporated which allows to discriminate between a DC control voltage or a relatively low-frequency pulsewidth-modulated signal using the same pair of input leads. By appropriate conditioning and waveshaping, the circuit produces a pulsewidth-modulated output which is then coupled across an isolation boundary and then demodulated to provide a command signal to the dimming ballast.

REFERENCES:
patent: 4740883 (1988-04-01), McCollum
patent: 4889999 (1989-12-01), Rowen
patent: 5003230 (1991-03-01), Wong et al.
patent: 5089751 (1992-02-01), Wong et al.
patent: 5198726 (1993-03-01), Van Meurs et al.
patent: 5204587 (1993-04-01), Mortimer et al.
patent: 5245220 (1993-09-01), Lee
Advance Transformer Co. Mark 7 Series Dimming Ballast Brochure.
Carlson, Luminoptics Single Zone Controller Users $ Manval, Jul. 5, 1984.

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