EP1048934A2 - Détecteur du type deux fils - Google Patents

Détecteur du type deux fils Download PDF

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Publication number
EP1048934A2
EP1048934A2 EP00106483A EP00106483A EP1048934A2 EP 1048934 A2 EP1048934 A2 EP 1048934A2 EP 00106483 A EP00106483 A EP 00106483A EP 00106483 A EP00106483 A EP 00106483A EP 1048934 A2 EP1048934 A2 EP 1048934A2
Authority
EP
European Patent Office
Prior art keywords
connection
measuring
wire
wire sensor
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00106483A
Other languages
German (de)
English (en)
Other versions
EP1048934A3 (fr
Inventor
Lothar Dipl.-Phys. Blossfeld
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Micronas GmbH
Original Assignee
TDK Micronas GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TDK Micronas GmbH filed Critical TDK Micronas GmbH
Publication of EP1048934A2 publication Critical patent/EP1048934A2/fr
Publication of EP1048934A3 publication Critical patent/EP1048934A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage

Definitions

  • the invention relates to a two-wire sensor device with a measuring sensor, which two Connections both for measuring signal transmission and for simultaneous power supply having.
  • Two-wire sensors are made up of a measuring sensor that is a physical quantity such as measures the temperature, pressure or field strength of a magnetic field, and electronic Components for processing the signals supplied by the measuring sensor. Either the power supply as well as the forwarding of the measured and processed Measurement signals take place over only two lines, from which the name two-wire sensor can be traced is. A two-wire sensor therefore has only two connections, which simultaneously supply the power and the forwarding of the measured and processed measurement signals.
  • the invention solves this problem in that an output stage at the two connections is connected to provide a voltage signal that is in operation of the two-wire sensor device always greater than a given reference voltage signal and its Amplitude is a measure of the physical quantity detected by the measuring sensor.
  • the inventive design of the two-wire sensor has the two-wire sensor now no longer the property of a current source, but rather that of a voltage source; any number of two-wire sensors according to the invention can therefore be connected in series switch.
  • n two-wire sensors
  • n + 1 lines and 2n Plug required, while in a parallel connection 2n cables and 4n - 2 plugs, so twice as many components are required if n> 1.
  • FIG. 1 The first embodiment of the invention shown in FIG. 1 will now be described and explained.
  • FIG. 1 shows the measurement outputs M1 and M2 of a measurement sensor (S) with the inputs E1 and E2 of a current-voltage converter (W) connected, at the output of which Output voltage UA is present, which is a measure of the physical detected by the measuring sensor (S) Represents size and is always larger than a predetermined reference voltage signal Uref.
  • the supply current IV for the two-wire sensor is the one connection A1 for power supply and the other connection A2 for power supply of the measuring sensor S supplied, whose measuring outputs M1 and M2 with the inputs of a comparator VL are connected.
  • the output of the comparator VL is one with the control input controllable switch U connected, whose input with the one input of a Operational amplifier OP and via a resistor R0 to the one connection A1 Power supply and is connected to the output of the operational amplifier OP.
  • the outputs of the controllable changeover switch U are each connected via a resistor R1 and R2 the other connection A2 for power supply and with the input of a reference voltage source Uref connected whose output to the other input of the operational amplifier OP is connected.
  • the controllable changeover switch U is used by the comparator VL as a function of the measurement signals controlled at the input of the comparator VL.
  • the input is in a first state of the controllable switch U via the resistor R1 at the other connection A2 for the Power supply while in the second state through resistor R2 with the other Connection A2 is connected to the power supply.
  • the voltage UA at the output of the operational amplifier OP is therefore a measure of the physical quantity detected by the measuring sensor S and always larger as a predefinable reference voltage signal Uref.
  • the one in a switching state on the voltage divider voltage falling from the resistors R0 and R1 becomes in the operational amplifier OP compared with the reference voltage Uref.
  • the voltage drop across the voltage divider from the resistors R0 and R2 in the operational amplifier OP compared with the reference voltage Uref.
  • the characteristic curve shown in FIG. 7 of the second exemplary embodiment according to the invention corresponds to that of a Zener diode.
  • the two-wire sensor according to the invention has to apply UA to the power supply lines now no longer the property of a power source, but rather that of one Voltage source, so that several two-wire sensors according to the invention can be connected in series are.
  • FIG 3 shows a third exemplary embodiment of a two-wire sensor according to the invention shown that differs from the second embodiment in that n comparators VL1 to VLn are provided, whose outputs with the inputs of a digital Evaluation circuit D are connected.
  • the output of the digital evaluation circuit D is connected to the control input of the controllable switch U, whose n outputs via a resistor R1 to Rn to the other connection A2 for power supply and the input of the reference voltage source Uref is connected.
  • the operational amplifier OP therefore gives n different voltages at its output UA, which is a measure of the physical quantity detected by the measuring sensor S and always larger as a predefinable reference voltage signal Uref.
  • the fourth exemplary embodiment of the invention differs from the second in FIG. 2 shown embodiment in that the resistor R1 through a diode D or a programmable digital circuit, for example a digital-to-analog converter, is replaced.
  • the digital circuit D can be controlled, for example, by a data protocol that is transmitted by a current modulation.
  • the characteristic curve corresponds to the characteristic curve of a Zener diode with variable Zener voltage.
  • n two-wire sensors S according to the invention are connected in series.
  • the parallel connection therefore requires twice as many connection components as the series connection.
  • a Hall sensor As stated in subclaims 8, 9 and 10, a Hall sensor, a pressure sensor or, for example, a temperature sensor can be used.
  • the reference voltage source Uref is a reference voltage of high constancy and without drift through Aging of the component achieved.
  • Two-wire sensors with such reference voltage sources can therefore be arranged in different locations with widely differing temperatures become, which is often the case, for example, in motor vehicle construction.
  • the two-wire sensors according to the invention are in series switch, they are particularly suitable for installation in motor vehicles.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
EP00106483A 1999-04-27 2000-03-25 Détecteur du type deux fils Withdrawn EP1048934A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19919084 1999-04-27
DE19919084A DE19919084C2 (de) 1999-04-27 1999-04-27 Zweidrahtsensoreinrichtung

Publications (2)

Publication Number Publication Date
EP1048934A2 true EP1048934A2 (fr) 2000-11-02
EP1048934A3 EP1048934A3 (fr) 2003-12-10

Family

ID=7906011

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00106483A Withdrawn EP1048934A3 (fr) 1999-04-27 2000-03-25 Détecteur du type deux fils

Country Status (3)

Country Link
US (1) US6437581B1 (fr)
EP (1) EP1048934A3 (fr)
DE (1) DE19919084C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012219501A1 (de) * 2012-10-25 2014-04-30 BSH Bosch und Siemens Hausgeräte GmbH Sensoranordnung für eine Haushaltsgerät sowie ein Haushaltsgerät mit einer derartigen Sensoranordnung

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10145520B4 (de) * 2001-09-14 2004-09-09 Vega Grieshaber Kg Schaltungsanordnung zur Spannungsversorgung eines Zweidrahtsensors
DE10146204A1 (de) * 2001-09-19 2003-04-10 Grieshaber Vega Kg Schaltungsanordnung zur Spannungsversorgung eines Zweidrahtsensors
US7100455B2 (en) * 2004-08-27 2006-09-05 Dresser-Nagano, Inc. System and method for pressure measurement
US7252009B2 (en) * 2004-08-27 2007-08-07 Ashcroft-Nagano, Inc. System and method for pressure measurement
US7433267B2 (en) * 2004-12-13 2008-10-07 Ssi Technologies, Inc. Two wire resistive sensor
US7719411B2 (en) * 2007-06-12 2010-05-18 Robert Bosch Gmbh Method and system of transmitting a plurality of movement parameters of a vehicle via a two-wire interface
US8054071B2 (en) 2008-03-06 2011-11-08 Allegro Microsystems, Inc. Two-terminal linear sensor
US7969041B2 (en) * 2009-02-03 2011-06-28 Infineon Technologies Ag System where the number of conductors equals the number of sensors and each of the sensors receives voltages via a different set of two conductors and provides data via the different set of two conductors
WO2011048786A1 (fr) * 2009-10-21 2011-04-28 旭化成エレクトロニクス株式会社 Émetteur bifilaire
US9464880B2 (en) * 2010-07-15 2016-10-11 Metrix Instrument Co., Lp Dual wire dynamic proximity transducer interface for use in proximity transducer system and proximity transducer system including the same
DE102017119575A1 (de) * 2017-08-25 2019-02-28 Tdk-Micronas Gmbh Verfahren zur Programmierung eines Zweidrahtsensors und ein programmierbarer Zweidrahtsensor
FR3081560B1 (fr) * 2018-05-22 2020-06-05 Autovib Dispositif electronique de mesure d'une grandeur determinee presentant une interface deux fils.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3519709A1 (de) * 1984-06-04 1985-12-05 Yamatake-Honeywell Co. Ltd., Tokio/Tokyo Dialogverfahren und vorrichtung zur durchfuehrung dieses verfahrens
US5790046A (en) * 1994-06-30 1998-08-04 Deutsche Itt Industreis Gmbh Sensor with a programmable switching threshold
US5793754A (en) * 1996-03-29 1998-08-11 Eurotherm Controls, Inc. Two-way, two-wire analog/digital communication system

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DE6912918U (de) 1969-03-25 1969-09-18 Varta Ag Vorrichtung zur kontinuierlichen herstellung von negativer aktiver masse fuer alkalische akkumulatoren
FR2447540A1 (fr) * 1979-01-26 1980-08-22 Jaeger Circuit de mesure analogique d'une grandeur avec indication a distance
US4374333A (en) * 1980-05-27 1983-02-15 Sprague Electric Company Two terminal Hall-sensor
US5049878A (en) * 1981-05-13 1991-09-17 Drexelbrook Engineering Company Two-wire compensated level measuring instrument
ATE140569T1 (de) * 1988-04-11 1996-08-15 Omron Tateisi Electronics Co Zweidraht-sensorsystem mit mitteln zur selbstdiagnose
DE3828428C1 (en) * 1988-08-22 1989-11-02 Honeywell-Schild Ag, Biel, Ch Voltage supply for proximity switches
US4939455A (en) * 1988-09-02 1990-07-03 Hamilton Standard Controls, Inc. Sensor having two-wire connection to load
FR2668257B1 (fr) * 1990-10-18 1994-05-13 Telemecanique Detecteur du type deux fils a tension regulee.
US5488307A (en) * 1993-12-22 1996-01-30 Namco Controls Corporation Sensor interface method and apparatus
US5535243A (en) * 1994-07-13 1996-07-09 Rosemount Inc. Power supply for field mounted transmitter
WO1996004630A1 (fr) * 1994-08-03 1996-02-15 Drexelbrook Controls, Inc. Systeme de controle extremement fiable
DE19723645B4 (de) * 1997-06-05 2006-04-13 Endress + Hauser Gmbh + Co. Kg Anordnung zur Signalübertragung zwischen einer Geberstelle und einer Empfangsstelle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3519709A1 (de) * 1984-06-04 1985-12-05 Yamatake-Honeywell Co. Ltd., Tokio/Tokyo Dialogverfahren und vorrichtung zur durchfuehrung dieses verfahrens
US5790046A (en) * 1994-06-30 1998-08-04 Deutsche Itt Industreis Gmbh Sensor with a programmable switching threshold
US5793754A (en) * 1996-03-29 1998-08-11 Eurotherm Controls, Inc. Two-way, two-wire analog/digital communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012219501A1 (de) * 2012-10-25 2014-04-30 BSH Bosch und Siemens Hausgeräte GmbH Sensoranordnung für eine Haushaltsgerät sowie ein Haushaltsgerät mit einer derartigen Sensoranordnung

Also Published As

Publication number Publication date
US6437581B1 (en) 2002-08-20
EP1048934A3 (fr) 2003-12-10
DE19919084C2 (de) 2001-05-31
DE19919084A1 (de) 2000-11-16

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