Inverter for providing an output low in harmonics

Details Inverter for providing an output low in harmonics Inverter for providing an output low in harmonics

H - Electricity

02

M

321/34, 321/45,

H02M 7/44 (2006.01) H02M 1/12 (2006.01) H03K 5/13 (2006.01) H02M 7/48 (2006.01)

Patent

CA 1073970

ABSTRACT OF THE DISCLOSURE A DC to AC inverter in which a composite waveform synthesizing a sinu- soidal waveform and having three incremental steps for each quarter cycle is formed by summing an alternating stepped waveform having three steps for each half cycle, with a square wave in phase therewith and having a frequency three times greater than the alternating stepped waveform. In a three-phase embodi- ment of the inverter, each of three stages has a coil that is appropriately switched to opposite polarity terminals of a DC voltage source to form beginning and end segments of the alternating waveform, and a single square wave for all three phases is developed by three series-connected windings respectively in- ductively coupled with the three coils. The single square wave is added to all three alternating stepped waveforms to form the three composite output waveforms of the inverter.

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