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. 01, 2020
Filed:
Oct. 19, 2018
Fanuc Corporation, Yamanashi, JP;
Nozomu Hasegawa, Yamanashi, JP;
Yoshikiyo Tanabe, Yamanashi, JP;
FANUC CORPORATION, Yamanashi, JP;
Abstract
A surge protective circuit is connected between a single-phase AC power source and an apparatus that operates with electric power supplied from the AC power source to suppress an overvoltage applied from the AC power source to the apparatus. The surge protective circuit includes: a first constant-voltage device and a first discharge device connected in series between a first ground terminal and a non-ground-side terminal of the AC power source; and a second constant-voltage device and a second discharge device connected in series between a second ground terminal and a ground-side terminal of the AC power source. A midpoint between the first constant-voltage device and the first discharge device and a midpoint between the second constant-voltage device and the second discharge device are connected.