Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2007-01-18
2009-06-02
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S801000, C318S809000, C318S812000, C318S632000
Reexamination Certificate
active
07541769
ABSTRACT:
An electric power converter which has improved accuracy in compensation of a dead time. A motor driving system employing the electric power converter is also provided. A power module includes a plurality of switching devices connected in series and converts DC power to AC power. A control circuit produces a voltage command value in accordance with a control command inputted from the exterior, and produces gate signals to drive the switching devices of the power module corresponding to a final voltage command value which is obtained from the voltage command value with dead time compensation. A dead time compensation logic circuit calculates a final dead time compensation voltage based on a change rate of the voltage command value, a gain (dead time compensation voltage value), and a polarity of a current, the gain being calculated from a DC voltage value supplied to the electric power converter, a dead time, and a switching frequency.
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European Search Report dated Apr. 5, 2007 (Six (6) pages).
Chinese office action dated Jun. 27, 2008 in English.
Nawa Masamichi
Sawada Takefumi
Crowell & Moring LLP
Dinh Thai
Donovan Lincoln
Hitachi , Ltd.
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