Apparatus for generating a high time-varying AC voltage using low voltage
power semiconductors arranged in series bridge circuits, each powered by
an independent DC source. At least one bipolar output pulse width
modulation bridge circuit and at least a pair of bipolar output square
wave generator bridge circuits have their outputs added together and
passed through a low pass filter to form a time-varying, typically
sinusoidal, AC output waveform. A first square wave generator has an
output with a relative magnitude of 6, a second square wave generator has
an output with a relative magnitude of 2 and the pulse width modulator
has an output with a relative magnitude of 1. Additional square wave
generators of relative magnitude 6 may be added to increase the output
voltage.