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Converter topologies for common mode voltage reduction

United States Patent

9,825,556
November 21, 2017
View the Complete Patent at the US Patent & Trademark Office
An inverter includes a three-winding transformer, a DC-AC inverter electrically coupled to the first winding of the transformer, a cycloconverter electrically coupled to the second winding of the transformer, and an active filter electrically coupled to the third winding of the transformer. The DC-AC inverter is adapted to convert the input DC waveform to an AC waveform delivered to the transformer at the first winding. The cycloconverter is adapted to convert an AC waveform received at the second winding of the transformer to the output AC waveform having a grid frequency of the AC grid. The active filter is adapted to sink and source power with one or more energy storage devices based on a mismatch in power between the DC source and the AC grid. At least two of the DC-AC inverter, the cycloconverter, or the active filter are electrically coupled via a common reference electrical interconnect.
Rodriguez; Fernando (Austin, TX)
SunPower Corporation (San Jose, CA)
15/ 080,142
March 24, 2016
GOVERNMENT RIGHTS This invention was made in part with government support under Grant No. DE-EE0005341 awarded by the Department of Energy. The Government has certain rights in this invention.