POWER CONVERSION DEVICE
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Accused Products
Abstract
A failure in the activation, of a motor, caused by external noise superimposed on an induced voltage is reduced. A detection circuit is connected to a connection node provided between an upper-arm switching element and a lower-arm switching element, and detects the induced voltage of a fan motor before activation. The switching controller activates the fan motor in accordance with a result of detection by the detection circuit. While the detection circuit detects the induced voltage, the switching controller performs switching control which involves alternately turning ON and OFF of the lower-arm switching element.
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Citations
9 Claims
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1-5. -5. (canceled)
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6. A power conversion device which supplies power to a motor having phases and included in an air conditioner, the power conversion device comprising:
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an inverter circuit including;
a switching element pair constituted of an upper-arm switching element and a lower-arm switching element connected in series to each other; and
a connection node provided between the upper-arm switching element and the lower-arm switching element, and connected to the motor, the switching element pair including as many switching pairs as the phases of the motor;a detection circuit connected to the connection node, and configured to detect an induced voltage, of the motor before activation, in at least one of the phases in the motor; and a switching controller capable of activating the motor, by controlling ON and OFF of the upper-arm switching element and the lower-arm switching element, in accordance with a result of the detection by the detection circuit, the switching controller being configured to perform switching control causing at least one of lower-arm switching elements, including the lower-arm switching element corresponding to the one phase intended for the detection of the induced voltage, to alternately turn ON and OFF, at a predetermined frequency higher than a frequency of the induced voltage, when the detection circuit detects the induced voltage. - View Dependent Claims (7, 8, 9)
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Specification