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US Patent 9966871 Rectification device, alternator, and power conversion device

Patent 9966871 was granted and assigned to Hitachi Power Semiconductor Device, Ltd. on May, 2018 by the United States Patent and Trademark Office.

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Patent attributes

Patent Applicant
Hitachi Power Semiconductor Device, Ltd.
Hitachi Power Semiconductor Device, Ltd.
Current Assignee
Hitachi Power Semiconductor Device, Ltd.
Hitachi Power Semiconductor Device, Ltd.
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
9966871
Date of Patent
May 8, 2018
Patent Application Number
15104116
Date Filed
December 12, 2014
Patent Primary Examiner
‌
Harry Behm
Patent abstract

A rectifier including an autonomous type synchronous-rectification MOSFET is provided, which prevents chattering and through-current caused by a malfunction when a noise is applied. The rectifier includes: a rectification MOSFET for performing synchronous rectification; a determination circuit configured to input a voltage between a pair of main terminals of the rectification MOSFET, and to determine whether the rectification MOSFET is in on or off state on the basis of the inputted voltage; and a gate drive circuit configured such that a gate of the rectification MOSFET is turned on and off by a comparison signal from the determination circuit, and such that a time required to boost a gate voltage when the rectification MOSFET is turned on is longer than a time required to lower the gate voltage when the rectification MOSFET is turned off.

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