Patent ID: 7715205
Filing Date: 2010-05-11
Classification: H02M

Abstract:
1. A self-excited inverter circuit, comprising: a booster transformer with a secondary coil, a feedback coil, and a primary coil respectively wound thereon, the primary coil including a center tap to which operating power is supplied; a first N-channel FET having a drain to which is connected one terminal of the primary coil, and having a gate to which is connected one terminal of the feedback coil; a second N-channel FET having a drain to which is connected the other terminal of the primary coil, and having a gate to which is connected the other terminal of the feedback coil; and a control configured to turn on and off the first N-channel FET and the second N-channel FET alternatively for turning on a discharge tube for a back light of a liquid crystal tube, wherein: the first and second N-channel FETs are formed in a single package; the package has terminals which are respectively connected to the drain of the first N-channel FET and the drain of the second N-channel FET; the package is arranged such that the terminals face the booster transformer; the package is mounted on a soldered surface of a substrate adjacent to the booster transformer where the drain terminal of the first N-channel FET and the drain terminal of the second N-channel FET respectively face the booster transformer; the size of the liquid crystal panel is approximately 15 inches; and the voltage of the operating power is approximately 20 V.