FPGA-based ASIC design of the three-phase synchronous PWM flyback converter

The design and development of a synchronous pulse-width modulation (PWM) generator suitable for the three-phase flyback converter is presented. The design is based on the Xilinx chip XC4005E field programmable gate array (FPGA). Two 30° of sine waveforms with two different carrier waveforms are used to generate the PWM. The PWM pattern proposed occupies less FPGA block cell, hence more space can be used for other control circuitry. The proposed technique enables the modulation index and the displacement factor to be changed externally. Results are provided to demonstrate the effectiveness of the design.