BUCK CONVERTER WITH A NEW DRIVING CIRCUIT IN A TV POWER-SYSTEM

ln this letter, a new buck converter of a TV power system is presented , First, we devised a driving circuit for an emitter-coupled type buck converter, by which it is possible to reduce the material cost of tra nsformers and voltage stress of power device, Second, we adopted a hyb rid oscillation technique. After self-oscillating mode feeds initial s tandby power, main power is provided by a forced oscillating mode and switching frequency is synchronized to that of horizontal deflection, which results in reducing picture noises and the size of power transfo rmer, Third, a simple error amplifier is added in the feed-back loop t o keep the output voltage constant, Finally, we showed that experiment al values of our proposed converter agree well with the theoretical va lues.