Buck Bost Rectification By Single Phase Matrix Converter Lab Report

Abstract—We focused on Buck/Boost Rectification by Single Phase Matrix Converter with fewer numbers of switches. The conventional matrix converter consists of 4 bidirectional switches, i.e. 8 set of IGBT/MOSFET with anti parallel diodes. In this proposed matrix converter, only six switches are used. The switch commutation arrangements are also carried out in this work. The gate pulses to the switches are provided by the PWM techniques. Step up or step down DC outputs can be obtained by using suitable switching algorithm. The MATLAB simulation results are provided to validate the feasibility of this proposed method.
Keywords— Converters, PWM, THD, MATLAB Simulation.
I. INTRODUCTION
The usage of switch-mode power supplies (SMPS) is increased
They are AC-AC, AC-DC, DC-DC and DC-AC conversions. In this AC-DC conversions are used in many portable applications. The converted DC supply has to be change according to the load connected to it. This is achieved by DC-DC chopper. Widely using DCDC choppers are Buck (step down) and Boost (Step up) The Matrix Converter (MC) topology was first introduced by Gyugyi in 1976 [2]. It is mainly used for AC-AC conversion. Other name for MC is PWM cycloconverter. It provides the all-silicon solution for AC-AC conversion by removing the DC link, which issued in conventional rectifier-inverter based system. Other advantages of MC are good input power quality, potentiality of increasing power density, reducing size and cost, bidirectional energy flow. The single phase matrix converter (SMPS) was first identified by zuckerberger in 1997 [1] as the direct single phase ACAC converter. The MC is also capable of rectifying [5],inverting [4], and chopping [6]. The conventional SMPS consists of 4 bidirectional switches. Each
It consists of 4 bidirectional switches. There is no discrete semiconductor device for bidirectional switch and hence the common emitter anti-parallel IGBT, diode pair is used. The IGBT were used because of its high switching capabilities and high current carrying capacities. A single bidirectional switch. The PWM pulse is generated by comparing triangular carrier signal and DC reference signal. The modulation index ma is getting changed by adjusting the amplitude of the reference and carrier signal, Hence the duty cycle of the gate pulse is varied to synthesize the required DC output from AC supply. The PWM pulse generation is shown . When the reference signal is higher than the carrier the pulse will generate. It is highly efficient, simple to design mostly due to not having a transformer. Puts minimal stress on the switch, and requires a relatively small output filter for low output ripple. The disadvantages to using a Buck are that there is no input to output isolation. There is a potential to over voltage the output if the switch shorts. It requires a high side switch drive, and has relatively high input ripple