The DC-AC converter, also known as inverter, converts DC power to AC power at
desired output voltage and frequency. The DC power input to the inverter is obtained
from an existing power supply. Nowadays inverters use high power switching
transistors either IGBT's and/or MOSFETs. In addition, the voltage and frequency of
the source can be adjustable. These single phase inverters and their operating principles
are analyzed in detail.
In this project, a full-bridge, single phase inverter that uses a digital Pulse Width
Modulation (PWM) to control the power switches at 18 kHz was constructed. The
concept of PWM with different strategies for inverters is described. A type of filter is
used to improve the distortion in the output waveform.
A design and implementation of PWM by using complex programmable logic device
(CPLD) from Altera MaxPlus II is constructed and programmed. The involved
software, hardware, and suitable algorithm to implement and generate the PWM are
developed in details. To verify the significant of this single phase inverter, the output
voltage will be tested with resistive load and inductive load
