The most common and popular technique for generating True sine Wave is Pulse Width Modulation
(PWM). Sinusoidal Pulse Width Modulation is the best technique for this. This PWM technique
involves generation of a digital waveform, for which the duty cycle can be modulated in such a way
so that the average voltage waveform corresponds to a pure sine wave. The simplest way of
producing the SPWM signal is through comparing a low power sine wave reference with a high
frequency triangular wave. This SPWM signal can be used to control switches. Through an LC filter,
the output of Full Wave Bridge Inverter with SPWM signal will generate a wave approximately
equal to a sine wave. This technique produces a much more similar AC waveform than that of others.
The primary harmonic is still present and there is relatively high amount of higher level harmonics in
the signal.