Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2007-11-27
2007-11-27
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S812000, C318S817000, C318S805000, C318S811000, C318S800000, C363S037000, C363S096000
Reexamination Certificate
active
10574533
ABSTRACT:
In an electric car control apparatus for driving an induction motor, detection accuracy of a DC voltage is improved. A DC power supply device is provided which has a maximum potential terminal A, an intermediate potential terminal B, a minimum potential terminal C, an upstream side capacitor6between the maximum potential terminal A and the intermediate potential terminal B, and a downstream side capacitor7between the intermediate potential terminal B and the minimum potential terminal C. Also, an overvoltage suppression part is provided which includes a resistor8and a thyristor9between the maximum potential terminal A and the minimum potential terminal C. Further, provision is made for a downstream voltage sensor10between the intermediate potential terminal B and the minimum potential terminal C, an upstream voltage sensor11between a junction of the resistor8and the thyristor9and the intermediate potential terminal B, and a three level inverter3connected to the maximum potential terminal A, the intermediate potential terminal B and the minimum potential terminal C for supplying AC power to the induction motor. The three level inverter3is controlled by using detected voltages of the downstream voltage sensor10and the upstream voltage sensor11.
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International Search Report dated Jul. 26, 2005.
Kawamoto Shouichi
Matsumoto Takeo
Nagatsuka Yoshio
Buchanan & Ingersoll & Rooney PC
Colon Eduardo
Donovan Lincoln
Mitsubishi Denki & Kabushiki Kaisha
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