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:
Jul. 12, 1988
Filed:
Feb. 06, 1987
Kiyoshi Tanigawa, Tochigiken, JP;
Fuji Electric Co., Ltd., Kawasaki, JP;
Abstract
A contactless switch for controlling a thyristor switching element by means of a sensor circuit includes a bridge rectifier across whose input terminals are connected in series on AC power supply and a load and across whose output terminals are connected the thyristor. The switch includes a constant-voltage circuit which charges a capacitor whose charge controls the state of the thyristor. The constant-voltage circuit is controlled by a disabling circuit which is controlled by the output of the sensor circuit. There is included a timing circuit supplied by the output of a current detection circuit which measures the charging current and is able to suspend the functioning of the disabling circuit for a prescribed period of time.