US Patent No. 10,602,601

CREEPING DISCHARGE ELEMENT DRIVE DEVICE AND CREEPING DISCHARGE ELEMENT DRIVE METHOD


Patent No. 10,602,601
Issue Date March 24, 2020
Title Creeping Discharge Element Drive Device And Creeping Discharge Element Drive Method
Inventorship Motofumi Tanaka, Yokohama (JP)
Toshiki Osako, Kawasaki (JP)
Hiroki Murayama, Yokohama (JP)
Naoto Shinohara, Kawasaki (JP)
Hiroyuki Yasui, Yokohama (JP)
Assignee KABUSHIKI KAISHA TOSHIBA, Minato-ku (JP)

Claim of US Patent No. 10,602,601

1. A creeping discharge element drive device comprising:a switching element configured to connect to a creeping discharge element;
a current detector configured to detect an alternating current flowing through the switching element;
a zero-cross detection circuit configured to detect a zero-cross point of the alternating current detected by the current detector;
a storage configured to store a first threshold value of a resonant period for determining an abnormality of the creeping discharge element during test operation; and
a controller programmed to:
drive the switching element to apply a test voltage to the creeping discharge element during the test operation, the test voltage being lower than a voltage applied to the creeping discharge element at a start of regular operation;
determine a resonant period of the alternating current from a zero-cross point of the alternating current detected by the zero-cross detection circuit during the test operation; and
restrict or stop the driving of the switching element in response to the resonant period exceeding the first threshold value.