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:
Oct. 17, 1978
Filed:
Mar. 23, 1976
Hans Undin, Akersberga, SE;
Pressmaster, Ltd., Stockholm, SE;
Abstract
Apparatus for controlling the supply of electric power to a power consuming appliance (e.g. an electric soldering iron) in dependence on a parameter (e.g. the temperature of the soldering iron) comprises electric circuit means including a thyristor connected in series with the appliance across an AC supply, a first voltage divider including a variable resistor for defining a set point for said parameter, a second voltage divider including a sensor for said parameter and adapted to provide an analogue electrical parameter, and a first and a second transistor having their bases connected respectively to tappings of said voltage dividers defined respectively by a terminal of said variable resistor and said sensor, the emitter of said second transistor being connected to the gate of said thyristor.