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. 14, 2021
Filed:
Jun. 13, 2018
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
Hikaru Miura, Hitachinaka, JP;
Akihiro Machida, Hitachinaka, JP;
Mutsumi Kikuchi, Hitachinaka, JP;
Tatsumi Yamauchi, Hitachinaka, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
Abstract
Disconnection of a circulation path through which a circulation current flows is detected while suppressing an increase in circuit scale. A battery monitoring device includes switching circuits that control currents flowing through coils of main contactors by being controlled to be turned on and off, freewheeling diodes that are connected to the coils of the main contactors to form circulation paths for circulating the currents, and a control unit. The control unit measures output voltages of the freewheeling diodes at an input terminal, and detects the disconnection of the circulation paths based on the output voltages of the freewheeling diodes.