The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 2013
Filed:
Dec. 27, 2010
Kazumasa Takai, Kagamigahara, JP;
Takeshi Naganuma, Inazawa, JP;
Kosaku Hioki, Ogaki, JP;
Yoshihiro Niwa, Gifu, JP;
Kazumasa Takai, Kagamigahara, JP;
Takeshi Naganuma, Inazawa, JP;
Kosaku Hioki, Ogaki, JP;
Yoshihiro Niwa, Gifu, JP;
Semiconductor Components Industries, LLC, Phoenix, AZ (US);
Sanyo Semiconductor Co., Ltd., Gunma, JP;
Abstract
When a driver unit is in a high impedance state as viewed from a first coil or a second coil, an induced voltage detector detects the voltage across the first coil or that across the second coil so as to detect an induced voltage occurring in the first coil or the second coil. The induced voltage detector includes a differential amplifier circuit for differentially amplifying an electric potential across the first coil or that across the second coil, and an analog-to-digital converter circuit for converting an analog value outputted from the differential amplifier circuit into a digital value and outputting the converted digital value to a control unit. The control unit generates a drive signal based on an input signal set externally and adjusts the drive signal in accordance with the induced voltage detected by the induced voltage detector so as to set the adjusted drive signal in the driver unit.