Patent ID: 8072159

Claim:
A multi-lamp driving circuit for driving a plurality of lamps, comprising: at least one power stage circuit that converts external electrical signals to alternating current signals; at least one transformer circuit connected to the at least one power stage circuit, the at least one transformer circuit for converting the alternating current signals to high voltage electrical signals capable of driving the plurality of lamps, and outputting the high voltage electrical signals via a first output end and a second output end; a balancing circuit that balances current flowing through the plurality of lamps, the balancing circuit comprising a capacitor balancing circuit and a transformer balancing circuit; and a control circuit connected between the balancing circuit and the power stage circuit to control output of the power stage circuit according to variation of the current flowing through the plurality of lamps; wherein the capacitor balancing circuit comprises a plurality of capacitors connected between the first output end of the at least one transformer circuit and first ends of the plurality of lamps; wherein the transformer balancing circuit comprises a plurality of transformers having first windings and second windings, wherein first ends of the first windings are jointly connected to the second output end of the at least one transformer circuit, second ends of the first windings are connected to corresponding second ends of the plurality of lamps, and the second windings are connected end-to-end to form a closed loop; wherein the control circuit is connected between the closed loop formed by the second windings of the plurality of transformers of the transformer balancing circuit and the power stage circuit.