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:
Mar. 05, 1996
Filed:
Dec. 14, 1994
Klaus Bott, Durmersheim, DE;
Bernd Schukraft, Karlsruhe, DE;
Landis & Gyr Technology Innovation AG, Zug, CH;
Abstract
Information appearing in the form of analog low-voltage signals (V.sub.1 ;V.sub.2) on call lines (ML1;ML2) which represents the states of switchgears (2.1;2.2) is conveyed in parallel to a circuit block (4). The information is digitalized at certain points in time and in accordance with a predetermined voltage level as binary values '0' or '1' and is transmitted in series to a control logic unit (1). The circuit block (4) is preferably a plurality of shift registers in cascade connection. Each call line is coupled via a coupling element (3.1;3.2) to the circuit block (4) so that the circuit block (4) is not destroyed even when overvoltages occur. In the closed state of a switchgear (2.1;2.2), a signal voltage (U.sub.1 ;U.sub.2) with changeable course appears at the corresponding input (4.1;4.2) of the circuit block (4). In the open state of a switchgear (2.1;2.2), the signal voltage (U.sub.1 ; U.sub.2) is a uniform signal (U.sub.1 ;U.sub.2). The digitalization is effected by means of a synchronization device (8) at points in time when the level of the changeable signal voltage (U.sub.1 ;U.sub.2) is clearly different from the level of the zero-point voltage (G). These controls are especially well suited to control an oil or gas burner in continuous operation.