POWER CONVERTER
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Accused Products
Abstract
In a power converter a controller determines that an AC motor is in an abnormal state when a voltage of each phase of the AC motor detected by a voltage detector is in an unbalanced state where the voltage exceeds a predetermined value, and turns an opening/closing unit OFF to prevent damage generated in the AC motor from becoming worse. Moreover, the controller determines abnormality of the opening/closing unit based on a current of each phase detected by a current detector, and the controller performs control to reduce the number of revolutions of the AC motor upon determining that at least one of the AC motor and the opening/closing unit is in an abnormal state.
36 Citations
28 Claims
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1-12. -12. (canceled)
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13. A power converter comprising:
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an inverter that converts a DC voltage or an AC voltage to an AC voltage of an arbitrary frequency to drive an AC motor having a permanent magnet therein; an opening/closing unit that is connected between the inverter and the AC motor; a controller that controls the inverter and the opening/closing unit; a voltage detector provided between the opening/closing unit and the AC motor; and a current detector provided between the inverter and the opening/closing unit, wherein the controller determines that the AC motor is in an abnormal state when a voltage of each phase of the AC motor detected by the voltage detector is in an unbalanced state where the voltage exceeds a predetermined value, and controls the opening/closing unit to turn it OFF to prevent damage generated in the AC motor from becoming worse, and the controller determines abnormality of the opening/closing unit based on a current of each phase detected by the current detector, and the controller performs control to reduce the number of revolutions of the AC motor upon determining that at least one of the AC motor and the opening/closing unit is in an abnormal state. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A power converter applied to a DC fed or AC fed electric vehicle, the power converter comprising:
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an inverter that converts a DC voltage or an AC voltage to an AC voltage of an arbitrary frequency to drive an AC motor having a permanent magnet therein; an opening/closing unit that is connected between the inverter and the AC motor; a voltage detector provided between the opening/closing unit and the AC motor; a controller that controls the inverter and the opening/closing unit, and a current detector provided between the inverter and the opening/closing unit, wherein the controller determines whether the AC motor is in an abnormal state based on a voltage of each phase of the AC motor detected by the voltage detector, and controls the opening/closing unit to turn it OFF to prevent damage generated in the AC motor from becoming worse, the controller determines whether the opening/closing unit is in an abnormal state based on a current of each phase detected by the current detector, and outputs an abnormality detection signal for controlling to reduce the number of revolutions of the AC motor and sends the signal to outside upon determining that at least one of the AC motor and the opening/closing unit is in an abnormal state. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification