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:
Sep. 21, 1982
Filed:
Oct. 24, 1980
George E Strauch, Jr, San Antonio, TX (US);
Power Controls Corporation, San Antonio, TX (US);
Abstract
A switch, that appears the same as an ordinary snap switch, is shown with a positive ON and a positive OFF with a variable control circuit therebetween. The variable control circuit includes a triac gated through a diac to give an infinite control range that depends upon the point at which the triac is triggered. In using the variable control circuit of the switch, a shunt or a bypass is provided for the gate of the triac through a full wave bridge rectifier circuit for a predetermined time interval. The time interval is determined by an RC time constant connected across the bridge. Therefore, for the aforementioned predetermined time interval, essentially a full wave AC voltage is passed through the triac to a load. For motors, this allows the motor to come up to speed prior to subsequently reducing the speed of the motor by the variable control circuit after the predetermined time interval.