Dimmer control circuit

Electric lamp and discharge devices: systems – Current and/or voltage regulation

Patent

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Details

315195, 315299, 315316, G05F 100, H05B 3702, H05B 3904, H05B 4136

Patent

active

040964140

ABSTRACT:
An improved solid state electronic dimmer circuit for controlling the intensity of large electric lamps, such as theater and television lamps, in response to a low power DC control signal. The transfer characteristic of the circuit is determined by the properties of a generated precision waveform having a predetermined shape and amplitude and a fixed phase relationship to the power line voltage which, in conjunction with the DC control signal, determines the effective voltage at the output of a dimmer unit. The same precision waveform may be used to control a plurality of dimmer channels, thereby making possible precise matching of performance of all commonly controlled channels, and effecting significant savings in the cost of manufacture.

REFERENCES:
patent: 3397344 (1968-08-01), Skirpan
patent: 3816797 (1974-06-01), Skirpan
patent: 4057751 (1977-11-01), Bonsignore et al.

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