Patent ID: 7683555
Filing Date: 2010-03-23
Classification: G02F,H01F,H05B

Abstract:
1. A discharge tube lighting circuit for use with two discharge tubes each having a first terminal and a second terminal, said lighting circuit comprising: a high-frequency driving circuit; first, second and third transformers each including a primary winding and a secondary winding, the primary windings being connected in parallel to the high-frequency driving circuit; a first electrode for being connected to the first terminal of one of the two discharge tubes; a second electrode for being connected to the first terminal of the other one of the two discharge tubes; and a third electrode for being connected in common to the second terminals of the two discharge tubes, and wherein the secondary winding included in the first transformer is connected to the first electrode, the secondary winding included in the second transformer is connected to the second electrode, and the secondary winding included in the third transformer is connected to the third electrode; said transformers being polarized for generating voltages to be applied to the first and second electrodes that are the same in polarity, and for generating a voltage to be applied to the third electrode that is opposite in polarity to the voltages to be applied to the first and second electrodes.