GAS DISCHARGE LAMP DRIVER CIRCUIT WITH LAMP SELECTION PART

摘要

A gas discharge lamp driver circuit, comprising an inverter (10) of a bridge type, which has first and second input terminals connected to DC power lines (6, 8) for receiving a DC power voltage and output terminals (18) for providing a substantial rectangular power voltage, a ballast (20), which is connected to the output terminals of the inverter and to one or more lamp circuits (30), each having a gas discharge lamp (32) connected in series with a current control circuit having a high frequency semiconductor switch element (34), which receives an individual selection signal (Sl, S2) from a selection circuit (36), such that an individual lamp (32) can be selected to operate. If deselected, the switch element conducts such that current is diverted to a selected switch element to thereby only ignite and operate a lamp connected to a selected switch element.