Patent ID: 6392367
Filing Date: 2002-05-21
Classification: H05B

Abstract:
An electric discharge lamp lighting device, comprising:an inverter circuit using a DC power source as input and configured that a primary winding having an intermediate tap of an inverter transformer, a resonance capacitor, and a primary winding of a synchronization transformer are connected together in parallel between collectors of a pair of transistors, an electric discharge lamp is connected in parallel to a secondary winding of said inverter transformer to supply discharge power to the electric discharge lamp, the opposite terminals of a tertiary winding of said inverter transformer are connected to bases of said transistors for switching operation of said transistors by application of feedback voltage from the tertiary winding of said inverter transformer, and a secondary winding is provided for said synchronization transformer; wherein said inverter circuit is provided every electric discharge lamp, and the secondary winding of said synchronization transformer of said inverter circuit is connected in parallel to the secondary winding of the synchronization transformer of the other inverter circuit to synchronize the oscillation frequencies of the plurality of inverter circuits with each other.