Lamps expensive circle

摘要

Control and switching circuits for maintaining appropriate balance of light output of a long multi-vapor arc lamp. The control circuit includes sensing, amplifier-reference, phase amplitude detector, time base generator and lamp switching logic branches. The switching circuit includes a silicon controlled rectifier bridge for reversing the polarity of current flow through the lamp. The silicon controlled rectifier bridge is triggered by output pulse chains from the lamp switching logic branch in the control circuit.