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:
Apr. 14, 1987
Filed:
Aug. 18, 1980
James R Ligman, Santa Barbara, CA (US);
Casablanca Fan Company, Inc., City of Industry, CA (US);
Abstract
A current control circuit for controlling the current supplied by an AC power source through an AC motor for providing a control of the speed of the motor, including, a semiconductor device having an input terminal, an output terminal and a control terminal and with the current passing from the input terminal to the output terminal forming a substantial portion of the current through the AC motor, and with a control signal provided at the control terminal and with an impedance provided in the output path of the semiconductor device and with the ratio between the amplitude of the control signal and the value of the impedance forming a substantial control of the value of the current passing from the input terminal to the output terminal, and with the ratio between the amplitude of the control signal and the value of the impedance controlled to predetermined values for controlling the current passing from the input terminal to the output terminal for controlling the speed of the motor.