System for controlling power applied to a gas discharge lamp

摘要: A system for controlling power applied to a gas discharge lamp by an AC source, wherein the dissipated in during half cycle is sensed measuring circuit. The circuit provides output signals proportional current through and voltage across its conduction. are multiplied difference between resultant multiplier signal reference time integrated fed pulse width modulator. modulator transformer trigger SCR series with at some point next cycle, which triggered being determined previous cycle. In another embodiment replaced transistor shuts off after has desired amount of given