Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1995-05-10
1997-04-29
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 98, 363132, H02M 3335
Patent
active
056255390
ABSTRACT:
A pulse train pulse-width modulated by PWM control using a sine-wave signal and a carrier signal is inverted alternately in positive-negative polarity. With a high-frequency AC signal obtained by the inversion, a primary side of a transformer for insulating input and output from each other is excited. This arrangement makes it possible to employ a high-frequency transformer which has a capacity ratio of about 1/30 and a weight ratio of about 1/20 relative to a commercial-frequency transformer, instead of using it. Thus, an inverter apparatus can be reduced in size and weight as compared with the system using the power-frequency transformer. A sine-wave AC waveform with substantially less distortion similar to the waveform output by the conventional PWM control can be obtained with a simple construction.
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Contractor Report "Design & Construction of an Advanced Power Conditioning Subsystem for Small Photovoltaic Applications" printed Mar. 1985 Steigerwold et al.
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1994 National Convention Record I.E.E. Japan-Industry Application Society-issued Aug. 1994.
Fujii Satoru
Hiyoshi Kozo
Kodama Hirokazu
Nakata Hirofumi
Takebayashi Tsukasa
Berhane Adolf
Sharp Kabushiki Kaisha
Wong Peter S.
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