AMPLITUDE CONTROL OF GAS DISCHARGE LAMPS

摘要

A ballast control circuit (10) for a gas discharge lamp (H1), using amplitude modulation (130) on lamp input power, provides variable lamp illumination intensity control (112). A closed loop controller (131) monitors and processes sensed lamp illumination intensity, lamp current (120), and lamp voltage (121) for producing a control signal (114) to a voltage amplitude controller (102).