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:
Jan. 18, 2022
Filed:
Apr. 10, 2019
Fdk Corporation, Tokyo, JP;
FDK CORPORATION, Tokyo, JP;
Abstract
A charger includes: a power supply device for charging a secondary battery; a power supply path that includes a first switch and a second switch, and supplies electric power from the power supply device to the secondary battery; a discharge circuit that includes a first resistor and a third switch, has one end connected to a connection point between the first switch and the second switch, and has the other end connected to a ground line; a short-circuit preventing circuit that includes a second resistor and a fourth switch, and is connected in parallel to the first switch; and a control device that controls open-close of each switch and acquires a voltage value V, wherein the control device detects a failure of each switch on a condition where the voltage value Vis different between a normal state and a failure state, in a combination of open-close control for each switch.