INVERTER CIRCUIT FOR DISCHARGE TUBE FOR MULTIPLE LAMP LIGHTING, AND SURFACE LIGHT SOURCE SYSTEM

摘要

PROBLEM TO BE SOLVED: To obtain a small and high performance shunt characteristic by eliminating a setting of an excess reactance by controlling the value of the negative resistance characteristics of a fluorescent tube to give a shunt transformer a reactance higher than the negative resistance characteristics.

SOLUTION: Two coils are connected to a secondary winding of the set-up transformer of the inverter circuit of a discharge lamp. The two coils form a shunt transformer of a current, in which magnetic fluxes generated in the two coils are faced each other and the fluxes are magnetically combined as to be canceled. A discharge tube is connected to each of the two coils. The tube currents of each of the discharge tubs are balanced in the inverter circuit for the discharge tube. Lighting is performed when a reactance at the the inverter circuit operation frequency of the inductance relating to the balance of the shunt transformer exceeds the negative resistance of the discharge tube.

COPYRIGHT: (C)2005,JPO&NCIPI