Single phase inverter design for LCD tv

This thesis discusses a new, CCFL (cold cathode fluorescent lamp) inverter for LCD (Liquid Crystal Display) TVs. LCDs need backlight illumination so they are generally using CCFLs as a backlight unit. To drive this unit, system needs inverter, because the CCFLs are supplied from high voltage high frequency ac signal. Several inverter topologies are exist but new approach for this drive unit by using parallel resonant inverter topology without a transformer will be introduced. This new approach will reduce overall system size. Also the total power demand is changing for LCD TVs, because backlight unit generally consumes %40 of input power. The previous inverter is supplied from SMPS but this inverter is supplied from regulated output of rectifier. In this thesis a parallel resonant inverter is used. There are different resonant inverter topologies like as series inverter, parallel resonant inverter and series parallel resonant inverter circuits. The voltage transfer function of this inverter will be examined and compared. THD of output voltage of these inverters are analyzed. 15?? panel is chosen for application, lamp model is defined and whole circuit is performed. By using the component values estimated simulation is carried out in PSPICE package program. The simulation results are compared with the experimental results in this thesis. Keywords: CCFL inverter, backlight inverter, LCD TV, Cold Cathode fluorescent lamp.