Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-05-09
2006-05-09
Patel, Rajnikant B. (Department: 2838)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S762000, C318S798000, C363S098000
Reexamination Certificate
active
07042191
ABSTRACT:
A current detection unit of an inverter outputs currents to a load, such as a motor includes a device for measuring a DC current flowing in the inverter. The current detection unit also includes a measurement time setting device for setting a measurement time of power source currents at at least one of an uppermost point and a lowest point of a reference chopping wave with a predetermined frequency, and a current phase detection means for detecting at least two phase currents from respective power source currents measured at two or more measurement times sequential to each other. A phased current output from the inverter to a load, such as a motor, may be detected with a high degree of accuracy and at a constant period.
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Baker & Botts LLP
Patel Rajnikant B.
Sanden Corporation
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