Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Reexamination Certificate
2006-03-28
2006-03-28
Nguyen, Matthew V. (Department: 2838)
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
C307S066000
Reexamination Certificate
active
07019989
ABSTRACT:
An uninterruptible power supply system prevents an output voltage from dropping due to an operation delay of a relay for isolating an alternating-current power source side and avoids an unexpected current flowing between the alternating-current power source side and the uninterruptible power supply system side. When short circuit occurs, a parallel converter connected in parallel to input terminals connected to an alternating-current power source is made to operate so that the output voltage thereof becomes “0” or the input voltage Vin and a series inverter connected in series between an input relay and one of output terminals is made to carry out a compensating operation with a smoothing capacitor taken as a power source so that a value of an applied voltage to the output terminals becomes an output voltage command value Vout*. This makes the output voltage of the parallel converter become “0” or Vin to produce no electric potential difference between the alternating-current power source side and the output side of the parallel converter. Therefore, no current flows between the alternating-current power source side and the parallel converter, and a value of an applied voltage to the output terminals is to be continuously maintained at the output voltage command value Vout* by the series inverter.
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Kobayashi Nobuyuki
Tokuda Hirokazu
Fuji Electric Holdings Co., Ltd.
Nguyen Matthew V.
Rossi Kimms & McDowell LLP
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