Design of FPGA- Based SPWM Single Phase Full-Bridge Inverter
Keywords:SPWM-Sinusoidal Pulse Width Modulation, FPGA-Field Programmable Logic Array, VHDL- Very High Description Language,
Nowadays power inverters serve as an important emergency power supply system in events of main power supply failure. The AC output voltage of a power electronic inverter is usually non-sinusoidal and hence has a high harmonic content. Sinusoidal Pulse Width Modulation (SPWM) scheme is normally used to convert the DC power supply into AC power supply by comparing the reference voltage waveform with the triangular waveform known as carrier. SPWM provides a way to reduce the total harmonic distortion of load current. The objective of this paper is to demonstrate a SPWM switching scheme by using Altera DE2-70 board. In this SPWM technique, a sinusoidal reference voltage waveform is compared with the triangular carrier voltage to generate the on and off switching states. This switching scheme will trigger the gate of the power switch. In this paper, the SPWM switching strategies implemented using Altera DE2-70 (Cyclone II EP2C35F672C6) with 16 bit serial configuration devices. The switching between reference and carrier waveforms of SPWM is obtained by using Matlab software. Simulation on the design waveform is conducted using Quartus II software tools provided by Altera. The output frequency of SPWM is 50 Hz and the design is limited to two values of modulation indices which are 0.5 and 0.75.
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