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:
Dec. 21, 1982
Filed:
Jun. 23, 1981
Gunther Weimer, Gerlingen, DE;
Henning Becker, Schonaich, DE;
Centra-Burkle GmbH & Co., Schonaich, DE;
Abstract
A system for alternately activating and deactivating a load comprises a high-resistance d-c circuit branch connected across a power supply downstream of a load-operating impedance, this branch including a voltage limiter and a voltage multiplier in series with each other and with a switching stage responsive to commands from a timer and/or a parameter sensor such as a thermostat. The junction of the voltage limiter and the voltage multiplier is connected to one input of a differential amplifier whose other input is energized with either of two potentials, respectively higher and lower than that of the junction, by the switching stage. The amplifier output controls a variable-resistance element, such as a transistor of the bipolar or the MOSFET type, connected across the high-resistance branch to form a current path in series with the load-operating impedance, the resistance of this path being variable between a high value minimizing the flow of load current and a low value sufficient to maintain the switching stage operational. A standby source may be provided for keeping the switching stage or at least an electric timer thereof energized during interruptions of the main power supply.