Electric power conversion systems – Current conversion – Using semiconductor-type converter
Reexamination Certificate
2007-08-28
2007-08-28
Nguyen, Matthew V. (Department: 2838)
Electric power conversion systems
Current conversion
Using semiconductor-type converter
C363S136000
Reexamination Certificate
active
11503135
ABSTRACT:
A power conversion apparatus is formed by connecting unit communication-assisting means in series between an alternating-current terminal incorporated in a conventional current-type power conversion apparatus, and an alternating-current load. The communication-assisting means includes reverse-blocking-type self-commutated devices and a capacitor. By controlling the switching of the reverse-blocking-type self-commutated devices, a voltage is generated at the capacitor and additionally used for a power supply commutation operation or load commutation operation. By virtue of this structure, the power conversion apparatus can easily provide a large capacity (high voltage, large current), and can be improved in power factor. Further, the structure enables the number of required fundamental elements to be reduced, and hence enables the power conversion apparatus to be produced easily at low cost.
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“Power Electronics Circuit,” compiled by the Institute of Electrical Engineers, the Semiconductor Power Conversion System Research Committee(Nov. 30, 2000), by Ohm Corporation, pp. vi-ix, 137-141, 154-157, and 326.
Nguyen Matthew V.
Toshiba Mitsubishi-Electric Industrial Systems Corporation
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