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:
Aug. 05, 2008
Filed:
Apr. 05, 2005
Masahiro Nakamura, Kyoto, JP;
Masahiro Nakamura, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A motor drive unit is adapted to detect a motor lock-up condition (in which an electric motor is accidentally locked during driving) based on the fact that motor drive current increases in that event. Then, a capacitor for generating a voltage signal is charged with an arbitrarily adjustable charging current to overcome the motor lock-up. To do this, an IC is formed to incorporate therein such components as a first discharging circuit for discharging the electric charge of the capacitor and a hysteresis-type comparison circuit for comparing the charging current with a threshold level to thereby adjust the charging current suitable for the motor used. Such a versatile IC as described above enables adjustment of the motor startup trial period for individual motors having different characteristics.