Patent ID: 6639810
Filing Date: 2003-10-28
Classification: H02M,H02P

Abstract:
An inverter apparatus having a direct current source circuit for converting an alternating current output of a generator into a direct current, a switching device for switching to control the direct current, a modulating means for pulse width modulating a reference sine wave signal at a predetermined frequency to produce a PWM signal, and a switching control circuit responsive to the PWM signal for driving the switching device to provide the alternating current through a pair of output lines, said inverter apparatus comprising:a correction signal generating means for generating a correction of the reference sine wave signal in view of the alternating current waveform to correct the alternating current waveform on the output lines to a desired shape of the sine waveform; and an A/D converter having a plurality of input channels, wherein the alternating current waveform is received by at least two of the input channels of the A/D converter, and two channels of the alternating current waveform converted to their digital form by the A/D converter are summed and then transferred to the correction signal generating means.