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:
Aug. 20, 2002
Filed:
Apr. 25, 2000
Lothar Blossfeld, Breitnau, DE;
Micronas GmbH, Freiburg, DE;
Abstract
Two-wire sensors for measuring physical quantities have only two connections (A , A ), which serve to connect the power supply and also to conduct the measuring signals. However, because two-wire sensors have the property of controlled current sources, they can be connected only in parallel. Consequently, for a parallel circuit of n two-wire sensors disposed at different locations, two n lines are required. To reduce the number of lines, a two-wire sensor is provided with an end stage (W), which generates an output voltage (UA), which is a measure of the physical quantity measured by a measuring sensor (S) and which is always greater than an adjustable reference voltage signal (Uref). Because the inventive two-wire sensor therefore has the property of a voltage source, several of them can be connected in series. Consequently, even for a series circuit of several two-wire sensors, only two lines are required.