Design and Simulation of a Semi Controlled Full Bridge and Its Control Circuit

In this paper, we design the LC filter for the desired output ripple voltage and the control circuit and simulated it to observe the output wave shape. First we find out the value of L of RL load then we find the value of C of RLC load of the full-bridge rectifier. All calculations are done in the continuous mode of conduction. Secondly, we designed the SCRs gate driver control circuit. Generating the pulses, we applied it to the gate through the transformer to provide ground isolation to each of the SCR. Simulated results show an excellent agreement with the theory. We also calculated the power factor and the Total Harmonic Distortion (THD) of the circuit.

I. Introduction

During last two decades, the rapid growth in the power electronics industry is caused an increased interest in teaching its fundamentals of power control circuit drive at the undergraduate and graduate levels in universities. In power electronics, simulation is a perfect addition to some hardware experience gained in the laboratory. In advance to building a prototype the main functions of a power electronic system are simulated on the computer what generally does save a considerable amount of time and money. Several programs, such as SPICE, SABER, CASPOC, SIMPLORER, for numerical simulation in power electronics are introduced and frequently used. In this project, I simulated the SCRs gate driver control circuit of a semi controlled full bridge rectifier which can convert the ac signal to dc signal. The applications of a semi-controlled rectifier are like Speed control for motors, Temperature control for electric hot plate, Dimmer switch for domestic lighting, Dimmer control for stage lighting etc.