Patent ID: 7990071

Claim:
A lamp drive circuit used for driving a plurality of lamps comprising a first lamp, a second lamp, a third lamp, and a fourth lamp, wherein the lamp drive circuit comprises: a power supply circuit comprising a first output terminal and a second output terminal used for providing an alternate voltage; a first balance circuit, coupled to the first output terminal, for driving at least the first lamp and the second lamp, the first balance circuit comprising: a first coil, wherein one end of the first coil is coupled to the first output terminal and the other end of the first coil is coupled to the first lamp; and a second coil, wherein one end of the second coil is coupled to the first output terminal and the other end of the second coil is coupled to the second lamp; wherein a voltage across the first coil of the first balance circuit corresponds to a voltage across the second coil of the first balance circuit; and a second balance circuit, coupled to the second output terminal, for driving at least the third lamp and the fourth lamps, the second balance circuit comprising: a first coil, wherein one end of the first coil is coupled to the second output terminal and the other end of the first coil is coupled to the third lamp; and a second coil, wherein one end of the first coil is coupled to the second output terminal and the other end of the second coil is coupled to the fourth lamp; wherein a voltage across the first coil of the second balance circuit corresponds to a voltage across the second coil of the second balance circuit.