Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1992-07-20
1995-07-25
Dougherty, Thomas M.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 58, 363 98, 363132, H02M 112
Patent
active
054368197
ABSTRACT:
The present invention provides an apparatus for and a method of compensating an output voltage error of an inverter that changes direct current (DC) power into alternating current (AC) power. More specifically, the present invention provides an apparatus for and a method of compensating for an output voltage error by detecting the polarity of output current from an inverter used to change DC power into AC power. In accordance with one embodiment of the present invention, a current detector is used to detect the output current of the inverter circuit. A polarity discriminating device, receiving the detected output current, sets a threshold current value that is to be used to accurately determine the polarity of the output current. As the output voltage error has the same phase but is opposite in polarity relative to the current output by the inverter, an accurate detection of the output error can be made by accurately detecting the output current polarity. The output current polarity is accurately determined by setting the threshold current values higher than the ripples occurring at the zero current value.
REFERENCES:
patent: 4878163 (1989-10-01), Yamato et al.
patent: 4969079 (1990-11-01), Kiriyama et al.
patent: 5072354 (1991-12-01), Katto et al.
Mikami Nobuhiro
Morohoshi Toshio
Dougherty Thomas M.
Mitsubishi Denki & Kabushiki Kaisha
Riley Shawn
Turner Richard C.
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