WO2001044760A1 - Circuit et procede de saisie de valeurs mesurees - Google Patents

Circuit et procede de saisie de valeurs mesurees Download PDF

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Publication number
WO2001044760A1
WO2001044760A1 PCT/DE1999/004011 DE9904011W WO0144760A1 WO 2001044760 A1 WO2001044760 A1 WO 2001044760A1 DE 9904011 W DE9904011 W DE 9904011W WO 0144760 A1 WO0144760 A1 WO 0144760A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit arrangement
connection
voltage
input
processing device
Prior art date
Application number
PCT/DE1999/004011
Other languages
German (de)
English (en)
Inventor
Marten Swart
Helmuth Orlogi
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/DE1999/004011 priority Critical patent/WO2001044760A1/fr
Publication of WO2001044760A1 publication Critical patent/WO2001044760A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass

Definitions

  • the present invention relates to a circuit arrangement for the measurement value acquisition with an input connection for establishing a connection to an external sensor, a data connection for establishing a connection to a data bus and with a processing device which converts input signals received via the input connection into a transmitter Data bus transmissible form converts, further a method for data acquisition.
  • the object of the present invention is to propose an improved method for measured value acquisition and to further develop the generic circuit arrangement in such a way that its use in measured value acquisition is simplified and improved.
  • the object is achieved in a circuit arrangement for recording measured values of the type mentioned at the outset by the characterizing features of claim 1.
  • the processing device has a switching device which adapts the behavior of the processing device to the type of input signal in such a way that the processing device can process various input signals and convert them into the transferable form.
  • the object is achieved by the method according to the invention, in which, after receiving a request signal arriving via a data connection, first a sensor located at an input connection is activated, then a measurement value supplied by the sensor is recorded, then the sensor is deactivated and the measurement value is transmitted via the data connection becomes.
  • the circuit arrangement can be used more universally. It has proven particularly favorable that it can record and forward the measurement data from different sensor types. A correspondingly adapted circuit arrangement no longer has to be used for each sensor type. This saves maintenance and warehousing costs, because there are not many different circuit arrangements and correspondingly different ones Spare parts are kept ready. Due to the improved possible uses due to the universality of the circuit arrangement, there is an increased need. This results in higher quantities, which in turn enable more economical production of the circuit arrangement according to the invention.
  • the method according to the invention has the particular advantage that sensors are used in a particularly energy-saving manner. Furthermore, the method can be used to measure on request. Measurements therefore only take place if the measurement results are actually to be used. In addition, an operating mode can also be provided in which the sensor regularly carries out measurements and buffers the measurement results, which can then be queried via the data bus at any time.
  • the processing device of the circuit arrangement according to the invention comprises several different interfaces with which it can process different types of input signals originating from the external sensors.
  • a digital interface for processing a digital input signal, an analog / digital converter for processing an analog input signal, a voltage measuring device for measuring a voltage present at the input connection, a current measuring device for measuring a current present at the input connection and a resistance measuring device for Measurement of a resistance applied to the input terminal can be provided.
  • the switching device is designed such that it adjusts the behavior of the processing device to the type of input signal as a function of a signal received at the data connection.
  • the circuit arrangement according to the invention is arranged as close as possible to the sensor connected to the input connection. This is intended to avoid falsification of the input signal supplied by the sensor. By converting the input signal into a transferable form, largely interference-free transmission of the sensor signals via the data bus is guaranteed below.
  • This arrangement entails that the sensors and the circuit arrangement according to the invention are generally arranged at distant and often inaccessible locations.
  • the processing device of the circuit arrangement according to the invention particularly preferably has a control device for activating and deactivating the external sensor connected to the input connection.
  • the sensor can thus be switched on and off from a remote location via the data bus connected to the data connection. This is particularly advantageous for sensors that have high energy requirements and are rarely queried.
  • the circuit arrangement according to the invention comprises a voltage supply device for supplying the external sensor connected to the input connection with energy.
  • the voltage supply device takes the energy from the alternating voltage or the superimposed DC voltage applied to the data connection. This simplifies the installation of the entire arrangement of sensors, circuit arrangements and data bus, since it is not necessary to lay an energy supply line for each individual sensor.
  • the voltage supply device particularly expediently comprises a controllable voltage regulation device, which is designed such that it outputs different output voltages as a function of a signal received at the data connection.
  • a controllable voltage regulation device which is designed such that it outputs different output voltages as a function of a signal received at the data connection.
  • FIG. 1 shows a block diagram of a circuit arrangement according to the invention for data acquisition
  • FIG. 2 shows a circuit diagram of a circuit arrangement according to the invention for recording measured values
  • FIG. 3 shows a block diagram of a first sensor which can be connected to the circuit arrangement according to FIG. 2;
  • FIG. 4 shows a block diagram of a second sensor which can be connected to the circuit arrangement according to FIG. 2; 1 shows a block diagram of a circuit arrangement according to the invention ...
  • the circuit arrangement 1 has an input connection 3, which is used to establish a connection to an external sensor 5.
  • the connection to the external sensor 5 is realized by an electrical line 7, which can consist of several signal and supply lines.
  • a data connection 9, which is also provided on the circuit arrangement 1, serves to establish a connection to a data bus 11.
  • the circuit arrangement 1 can communicate with a central control device 13 via the data bus 11. Further circuit arrangements (not shown) can be arranged on the data bus.
  • the circuit arrangement 1 comprises a processing device 15 and a voltage supply device 17.
  • the processing device 15 has an input / output device 19, a control device 21, a switching device 23, a digital interface 25, an analog / digital converter 27, a voltage measuring device 29 , a current measuring device 31 and a resistance measuring device 33.
  • the individual assemblies 19, 21, 23, 25, 27, 29, 31, 33 of the processing device 15 are connected to one another by bidirectional data lines.
  • a data line 35 leads from the data connection 9 to the input / output device 19.
  • the input / output device 19 is connected via a data line 37 to the control device 21 and via a data line 39 to the switching device 23, which in turn is connected to the control via a data line 40 - Er worn 21 is connected.
  • one data line 41 leads from the switchover device 23 to that of the digital interface 25, the analog / digital converter 27, the voltage measuring device 29, the current measuring device 31 and the resistance measuring device 33. All of these assemblies 25, 27, 29, 31, 33 are connected via data lines 43 connected to the input terminal 3.
  • the input / output device 19 receives and sends data via the data line 35 and the data connection 9 and converts this data into a form which can be processed by the other assemblies of the processing device 15. Conversely, the input / output device 19 processes the information provided in the processing device 15 for output to the data bus 11 into a form which can be transmitted on the data bus 11, for example the information coming from the external sensor 5 via the data line 39.
  • the control device 21 coordinates the interaction of the individual assemblies of the processing device 15, controls a voltage control device 45 provided in the voltage supply device 17 and activates or deactivates the external sensor 5. Certain control processes are firmly provided in the control device 21, and a large number of control processes can but are initiated by instructions which the central control device 13 sends to the circuit arrangement 1 via the data bus 11.
  • the level of the voltage to be output by the voltage regulating device 45 can be determined by such an instruction.
  • the control device 21 can act on the voltage regulating device 45.
  • the analog / digital converter 27 will be used accordingly. If the sensor signal consists of a voltage value, a current value or a resistance value, the voltage measuring device 29, the current measuring device 31 or the resistance measuring device 33 are used accordingly.
  • the activation or deactivation of the external sensor 5 is achieved in that the control device 21 sets the voltage supplied to the external sensor 5 via a voltage supply line 49 to zero. This can be achieved by controlling the voltage regulating device 45 or by controlling an additional switching element (not shown).
  • the power supply device 17 takes the energy required to supply the circuit arrangement 1 and the external sensors 5 via a line 47 from the data line 35, which forwards the AC voltage used for signal transmission from the data connection 9 to the input / output device 19.
  • the individual voltage supply lines that lead from the voltage supply device 17 to the individual assemblies of the processing device 15 are not shown for the sake of clarity.
  • the voltage supply line 49 leads from the controllable voltage regulating device 45 to the input connection 3. Via the control line 51, the control device 21 controls the level of the voltage output by the voltage regulating device 45.
  • FIG. 2 shows the circuit diagram of an embodiment of the circuit arrangement 1 according to the invention.
  • the assemblies of the circuit arrangement 1 shown in FIG. 1 and described above can in principle also be found in the circuit diagram shown in FIG. 2.
  • the input terminal 3 is formed by a multi-pin terminal block 60.
  • the connection bar 60 contains the connections which are required for communication with analog and digital sensors.
  • Connection 61 is used for the voltage supply.
  • a status line lies on connection 62, a clock line on connection 63, a trigger line on connection 64, a line for digital signals on connection 65, a line for analog signals on connection 66 and a ground line on connection 67.
  • a two-wire line with connections 69 is provided as the data connection 9.
  • two data lines 35 run from the connections 69 to a transmitter and receiver 71, which essentially corresponds to the input / output device from FIG. 1.
  • the connections 69 are connected via supply lines 47 to a bridge rectifier 73, which forms part of the voltage supply device of the circuit arrangement 1.
  • the voltage VCCI rectified by the bridge rectifier 73 is smoothed by a first capacitor 75.
  • This is connected via line 77 to the positive output of the bridge rectifier and via line 79 to the other output of the bridge rectifier, which represents the ground for circuit arrangement 1.
  • the live contact of the first capacitor 75 is connected to a voltage converter 81.
  • the voltage VCC2 output by the voltage converter 81 is preferably between 10 V and 20 V.
  • the voltage converter 81 is followed by a second capacitor 83 connected to ground for smoothing the voltage VCC2 output by the voltage converter 81.
  • the capacitors 75 and 83 also serve to store energy.
  • a line 85 leads the voltage VCC2 generated by the voltage converter 81 to a controllable voltage regulator 87, the output of which is connected to the terminal 61 of the terminal block 60.
  • the voltage VCC2 is tapped from the line 85 and fed to a first input 88 of a first operational amplifier 89.
  • a reference voltage is present at the second input 91 of the operational amplifier 89.
  • the operational amplifier 89 compares whether the voltage VCC2 generated by the voltage converter 81 corresponds to the reference voltage. In front of the voltage converter 81, the voltage VCCI for supplying the transmitter and receiver 71 is taken.
  • a control unit 93 is supplied with the voltage VCCI, which essentially has the functionality of the control device, the switching device, the digital interface and the analog / digital converter according to FIG. 1.
  • an analog / digital converter 95 is provided which has two inputs and an internal multiplexer. With the analog / digital converter, on the one hand, the analog input signals from connection 66 and, on the other hand, the voltage applied via line 97 can be digitized and thus measured.
  • a data line 99 is provided for communication between the control unit 93 and the transmitter and receiver 71.
  • a control line 101 leads from the control unit 93 to the voltage regulator 87. Through the control line 101, the control unit can influence the voltage output by the voltage regulator.
  • a line 103 leads from the output of the first operational amplifier 89 to the control unit. The control unit receives the information of the comparison between the voltage VCC2 present at the first operational amplifier 89 and the reference voltage present at the input 91 via the line 103.
  • a current measuring device and a device for activating and deactivating an external sensor (cf. FIG. 1), which is connected to the terminal strip 60 during operation, comprises a first and a second N-channel field effect transistor (FET) 105, 107 connected to ground and a second operational amplifier 109.
  • the external sensor can be activated and deactivated by the first N-channel FET 105.
  • a control line 111 starting from the control unit 93 is provided, which is connected to the gate connection of the first N-channel FET 105. If this line is connected to ground by the control unit, the N-channel FET is blocked. All field effect transistors used in the circuit shown are namely self-blocking enhancement MOSFETs. The sensor is therefore deactivated.
  • the second operational amplifier 109 is connected with an input connection 113 to a second reference voltage, with the other input connection 115 with the drain connection and with the output connection with the gate connection of the first N-channel FET 105.
  • a control circuit is implemented which causes the drain-source voltage of the first N-channel FET 105 to always remain the same as the second reference voltage. This ensures that the current measurement carried out by the first N-channel FET 105 has no effect on the voltage made available to the external sensor 5.
  • the gate connections of the two N-channel FETs 105, 107 are connected to one another.
  • the source connections are each connected to ground.
  • the identical gate-source voltage means that the source current of both N-channel FETs 105, 107 is also identical.
  • the transmission ratio can be set by means of different area ratios.
  • the advantage here is that the full sensor current does not have to be conducted via the internal current mirror.
  • a current mirror is implemented by means of a first and a second P-channel FET 117, 119 connected to the supply voltage VCC2 and a resistor 121.
  • the gate-source voltages are also identical in the P-channel FETs 117, 119. Due to the identical gate-source voltage, it also follows for identical P-channel FETs that the source current of the P-channel FET 117, 119 is identical.
  • This current mirror causes the current flowing through resistor 121 to be the same as that through second N-channel FET 107 flows, i.e. as high as the current from the external sensor via connection 67.
  • 3 and 4 show an example of the wiring of external sensors that can be used with a circuit arrangement according to FIG. 2.
  • 3 shows a Hall sensor 130.
  • the Hall sensor 130 is connected to a voltage supply connection 61 and a ground connection 67 of a terminal strip 60. In this sensor, only the sensor current of the Hall sensor is measured by the circuit arrangement according to FIG. 2, since this represents the measurement signal.
  • a digital acceleration sensor 132 is shown.
  • the digital acceleration sensor 132 is connected to a voltage supply connection 61, a connection 62 for a status line, a connection 63 for a clock line, a connection 64 for a trigger line, a connection 65 for digital signals and a connection 67 for a ground line.
  • the digital acceleration sensor 132 is supplied with energy on the one hand via these connections and, on the other hand, communication with the circuit arrangement 1 according to FIG. 2 can take place via the connections.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

L'invention concerne un circuit et un procédé permettant de saisir des valeurs mesurées, notamment pour un domaine d'application où un dispositif d'évaluation central traite les signaux provenant de plusieurs détecteurs. Ce circuit comprend une connexion d'entrée, une connexion de données et un dispositif de traitement qui convertit des signaux d'entrée enregistrés par l'intermédiaire de la connexion d'entrée, dans une forme transmissible par le bus de données. L'invention vise à perfectionner le circuit générique de manière à simplifier son utilisation dans la saisie de valeurs mesurées et à l'améliorer. A cet effet, il est prévu que le dispositif de traitement comporte un dispositif de commutation qui adapte le comportement du dispositif de traitement au type de signal d'entrée, de manière que le dispositif de traitement puisse traiter différents types de signaux d'entrée et les convertir dans la forme transmissible.
PCT/DE1999/004011 1999-12-16 1999-12-16 Circuit et procede de saisie de valeurs mesurees WO2001044760A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DE1999/004011 WO2001044760A1 (fr) 1999-12-16 1999-12-16 Circuit et procede de saisie de valeurs mesurees

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE1999/004011 WO2001044760A1 (fr) 1999-12-16 1999-12-16 Circuit et procede de saisie de valeurs mesurees

Publications (1)

Publication Number Publication Date
WO2001044760A1 true WO2001044760A1 (fr) 2001-06-21

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PCT/DE1999/004011 WO2001044760A1 (fr) 1999-12-16 1999-12-16 Circuit et procede de saisie de valeurs mesurees

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008034318A1 (de) * 2008-07-23 2010-01-28 Robert Bosch Gmbh Anordnung zur Auswertung der Messwerte eines Messwertwandlers
EP2101159A3 (fr) * 2008-03-12 2016-08-24 General Electric Company Interface de capteur

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3446248A1 (de) * 1984-12-19 1986-06-19 Robert Bosch Gmbh, 7000 Stuttgart Sensor zur messung physikalischer groessen und verfahren zum abgleich des sensors
GB2190501A (en) * 1986-05-15 1987-11-18 Mc Donnell Douglas Corp Multiplexed junction probe for fuel gaging system and system containing same
US4945353A (en) * 1988-11-17 1990-07-31 C&K Components, Inc. Telemetry system used with sensing devices
DE19512372A1 (de) * 1995-04-01 1996-10-10 Abb Patent Gmbh Einrichtung zur eigensicheren Signalanpassung
WO1999032856A1 (fr) * 1997-12-23 1999-07-01 Simmonds Precision Products, Inc. Procede et dispositif d'interfacage universel de capteur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3446248A1 (de) * 1984-12-19 1986-06-19 Robert Bosch Gmbh, 7000 Stuttgart Sensor zur messung physikalischer groessen und verfahren zum abgleich des sensors
GB2190501A (en) * 1986-05-15 1987-11-18 Mc Donnell Douglas Corp Multiplexed junction probe for fuel gaging system and system containing same
US4945353A (en) * 1988-11-17 1990-07-31 C&K Components, Inc. Telemetry system used with sensing devices
DE19512372A1 (de) * 1995-04-01 1996-10-10 Abb Patent Gmbh Einrichtung zur eigensicheren Signalanpassung
WO1999032856A1 (fr) * 1997-12-23 1999-07-01 Simmonds Precision Products, Inc. Procede et dispositif d'interfacage universel de capteur

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2101159A3 (fr) * 2008-03-12 2016-08-24 General Electric Company Interface de capteur
DE102008034318A1 (de) * 2008-07-23 2010-01-28 Robert Bosch Gmbh Anordnung zur Auswertung der Messwerte eines Messwertwandlers
DE102008034318B4 (de) * 2008-07-23 2019-08-29 Robert Bosch Gmbh Anordnung zur Auswertung der Messwerte eines Messwertwandlers

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