Inverter for providing a sinusodial output having a low harmonic

Details Inverter for providing a sinusodial output having a low harmonic Inverter for providing a sinusodial output having a low harmonic

1976-03-25

1977-12-13

Shoop, William M.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

H02M 112

Patent

active

040631443

ABSTRACT:
A DC to AC inverter in which a composite waveform synthesizing a sinusoidal waveform and having three incremental steps for each quarter cycle is formed by summing an alternating stepped waveform having three steps for 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 embodiment 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 inductively 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.

REFERENCES:
patent: 3638094 (1972-01-01), VeNard
patent: 3657633 (1972-04-01), Urish
patent: 3767996 (1973-10-01), Bates
patent: 3979662 (1976-09-01), Klein

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