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:
Mar. 31, 2020
Filed:
Jan. 17, 2018
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Yoh Takano, Fukushima, JP;
Abstract
A switch circuit includes a first switch connected to a first node such that the first switch is connected in series between the first node and a first electrode terminal of a DC power source. a second switch connected in series between the first node and a second node which is configured to be connected to a second electrode terminal of the DC power source, a soft switch circuit, a power switching element, and a controller. The soft switch circuit includes a capacitor connected in series between a third node and one of the first and second nodes, a charge-discharge switch connected in series between the third node and another of the first and second nodes, and a charge-discharge resistor connected in parallel to the charge-discharge switch. The power switching element has a drain terminal, a gate terminal connected to the first node, and a source terminal connected to the second node. The controller turns off the first switch, turns off the second switch, and switches the charge-discharge switch from turning off of the charge-discharge to turning on of the charge-discharge at a time point when the controller detects that a current flowing across the drain terminal and the source terminal of the power switching element is equal to or larger than a predetermined threshold while the first switch is turned on.