Field programmable gate array-based delta-modulated cycloinverter

A cycloinverter has been proposed to directly convert utility frequency AC, 50-Hz power to high-frequency AC power with delta pulse width modulation switching. Detailed design and simulation analysis is presented for single phase matrix converter (SPMC) topology with eight switches through MATLAB Simulink software. It has been found that minimum total harmonic distortion is 3.25% for modulation index, lying from 0.5 to 1. Any further increase or decrease in modulation index increases the harmonics in cycloinverter. A laboratory prototype of the proposed cycloinverter is developed through Xilinx field programmable gate array which generates the trigger pulses for various insulated gate bipolar transistor (IGBTs) used in the power circuit of the cycloinverter to produce an output frequency that is an integer multiple of the input supply frequency. The output waveforms have been synthesised for different value of output frequency with resistive-inductive (RL) and motor load. Test results are presented to validate the proposed design and simulated results of the system. The experimental results verify the working and operation of cycloinverter based on SPMC.