Study On The LCD Power Supply Based On Flyback Converter

Market of digital TV set estend explosive both here and abroad at present and year compound growth of sales volume increased rapidly. because of the energetical support in didital TV set industrial, market of liqud crystal display TV set develop speedly. Power supply industrial became the hardcore of LCD-TV (liqud crystal display TV), which explosive growth along with the market of digital TV set.The paper reviews the phylogeny of the LCD, describes the recent development situation of LCD-TV and several authority investigation institution do its prospective forcast. The research of the switching power supply, future development t rend is given in the paper. Outlines of LCD-TV technology, introduce the sort of topological structure. The BUCK type converter topological structure and the systematical basictheory were put emphasis on; the PFC(Power Factor Correction), the reasons of power factor simply and the core of L6562 were analyzed, emphatically on the application circuit of this core, and account the design parameter of the application circuit. The sort and control mode of PWM(Pulse Wide Modulation), the control core of UC3846 and OB2262 were explained, the application circuit of this core were specific analyzed, practice picture in the real circuit uses oscilloscope were educed and contrastive analysis in this research.