Electrical transmission or interconnection systems – Plural supply circuits or sources – Substitute or emergency source
Reexamination Certificate
2003-03-17
2008-10-07
Laxton, Gary L (Department: 2838)
Electrical transmission or interconnection systems
Plural supply circuits or sources
Substitute or emergency source
C324S548000, C320S167000
Reexamination Certificate
active
07432616
ABSTRACT:
In the inverter device of the invention, when a power source connected to an electrolytic capacitor5is interrupted, a switching control circuit6acontrols switching elements of an inverter main circuit7ato operate to supply a current to a load, thereby discharging charges of the electrolytic capacitor5, and an electrolytic capacitor electrostatic capacitance calculator10acalculates the electrostatic capacitance of the electrolytic capacitor, on the basis of: a discharged charge amount which is obtained from an outflow current Ic from the electrolytic capacitor5, and a discharge time; and a discharge voltage ΔV which is a voltage drop from beginning of discharging of the electrolytic capacitor5.
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Japanese Office Action dated Dec. 4, 2007.
Daijou Masakatsu
Eguchi Kiyoshi
Hatai Akira
Unno Mahito
Laxton Gary L
Mitsubishi Denki & Kabushiki Kaisha
Sughrue & Mion, PLLC
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