Electric lamp and discharge devices: systems – Current and/or voltage regulation
315195, 315299, 315316, G05F 100, H05B 3702, H05B 3904, H05B 4136
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.
patent: 3397344 (1968-08-01), Skirpan
patent: 3816797 (1974-06-01), Skirpan
patent: 4057751 (1977-11-01), Bonsignore et al.
Olson Spencer E.
Smith Alfred E.
Wise Robert E.
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