Current detection device, motor control device, and electric power steering device

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12214829
APP PUB NO 20240416990A1
SERIAL NO

18721458

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A current detection device includes a current detection unit configured to detect current flowing through a switching element of a lower-side arm; a correction value calculation unit configured to calculate an offset correction value, based on a detection value of the current detected by the current detection unit in a period during which the switching element off during PWM control, and to hold and update the calculated offset correction value; and a correction unit configured to correct, by the offset correction value held by the correction value calculation unit, the detection value of the current detected by the current detection unit in a period during which the switching element is on. The correction value calculation unit is configured to not update the offset correction value in a case where a duty ratio of the PWM control is equal to or less than a duty ratio lower limit value.

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Patent Owner(s)

  • NSK LTD.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kobayashi, Takayuki Tokyo, JP 235 2198
Uryu, Kyosho Tokyo, JP 12 23

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