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:
Apr. 21, 2020
Filed:
Sep. 20, 2018
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, Ibaraki, JP;
Kentaro Mikawa, Isesaki, JP;
Naoki Okamoto, Isesaki, JP;
HITACHI AUTOMOTIVE SYSTEMS, LTD., Hitachinaka-Shi, JP;
Abstract
A motor drive controller comprises: a driver unit comprising semiconductor switches (SW-SW) for adjusting power supplied to a motor; a control unit for outputting, to the driver unit, a control signal (PWM, PWM) for controlling on and off of the semiconductor switches (SW-SW); and an overcurrent monitoring unit for monitoring for an overcurrent at multiple locations in the driver unit. The control unit outputs, to the driver unit at a predetermined timing, the control signal for forcibly maintaining the semiconductor switches at at least two different on-off combination settings (M) one after another for a predetermine time per each on-off combination setting. Each time the predetermined time has elapsed, the control unit detects whether and which of abnormalities due to short-to-ground and short-to-supply has occurred in a motor power supply line connecting the motor to the driver unit, based on where an overcurrent is detected in the driver unit.