Design of resonant circuits based Embedded
Controller for power supply of LCD TV and Monitor

Abstract

Miniaturization of electronic gadgets and rapid development of technology have placed novel challenges in front of power design engineers for an efficient delivery of power at high power density. Next generation microprocessors will require a reductionin power consumption which will result in lower supply voltages for these microprocessors. Thus, power conversion will be guided by objectives such as low voltage, high power density, and high current and high efficiency. To fulfil the requirement of smaller size units as a result of technology scaling, high operating frequencies is the need of the hour. But such high frequencies bring forth the problem of increased switching losses.In this work, a simple buck converter with soft switching ZCS topology in full wave mode which includes a resonance circuit of inductor and a capacitor is proposed to optimize efficiency and reduce switching loss at a very high operating frequency. As high frequency operation is commanded, the size and weight of the power supply unit practically gets reduced and thus it becomes a better candidate for portable electronics equipment and personal digital assistants (PDAs). Also extended battery life which is a must for such handheld gadgets is directly dependent on the efficiency of the power conversion. Hence, a high efficiency circuit is expected to meet the ends.The system analysis for ZCS full wave mode is presented. Its advantage over the traditional hard switched PWM converter is well shown. The mathematical modeling of the configuration along with its modes of operation is described extensively. The feasibility of this circuit is supported by simulation results.