Patent ID: 7876055

Claim:
A lamp-lighting apparatus comprising: an inverter transformer having a primary winding and a secondary winding; a balancer coupled to the secondary winding of the inverter transformer and adapted to make more equal electrical currents flowing through a plurality of lamps, respectively, wherein said balancer has plural transformers, each of the transformers having a primary winding, a secondary winding, and a tertiary winding; and a control circuit adapted to detect whether all the lamps have been lit up, wherein the primary winding of each of the plural transformers is connected in series with a corresponding one of the lamps and with the secondary winding of the inverter transformer, wherein the secondary winding of each of the plural transformers is connected to form a closed loop with the secondary windings of the other plural transformers, and wherein the tertiary winding of each of the plural transformers is adapted to detect a voltage generated at the balancer.