EP0254828A1 - Dispositif pour la lecture à distance d'appareils électroniques - Google Patents

Dispositif pour la lecture à distance d'appareils électroniques Download PDF

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Publication number
EP0254828A1
EP0254828A1 EP87106971A EP87106971A EP0254828A1 EP 0254828 A1 EP0254828 A1 EP 0254828A1 EP 87106971 A EP87106971 A EP 87106971A EP 87106971 A EP87106971 A EP 87106971A EP 0254828 A1 EP0254828 A1 EP 0254828A1
Authority
EP
European Patent Office
Prior art keywords
transmitter
receiver
wire line
voltage
secondary winding
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.)
Granted
Application number
EP87106971A
Other languages
German (de)
English (en)
Other versions
EP0254828B1 (fr
Inventor
Niels-Thorup Andersen
Walter Trächslin
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.)
Electrowatt Technology Innovation AG
Original Assignee
Landis and Gyr Betriebs AG
Landis and Gyr 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 Landis and Gyr Betriebs AG, Landis and Gyr GmbH filed Critical Landis and Gyr Betriebs AG
Priority to AT87106971T priority Critical patent/ATE60683T1/de
Publication of EP0254828A1 publication Critical patent/EP0254828A1/fr
Application granted granted Critical
Publication of EP0254828B1 publication Critical patent/EP0254828B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
    • G08C17/04—Arrangements for transmitting signals characterised by the use of a wireless electrical link using magnetically coupled devices

Definitions

  • the invention relates to a device for remote reading of electronic measuring devices according to the preamble of claim 1.
  • Devices for remote wired reading of electronic measuring devices are generally known per se and are widespread.
  • equipment in permanently installed, calibratable measuring devices, e.g. kWh meter for thermal or electrical energy, required to obtain the information necessary for the above-mentioned activities from the measuring device, as described in FERNWAERME INTERNATIONAL Volume 9 (1980), No. 1, p. 58 ff. Is described.
  • Transmissions of the known type e.g. according to CH-PS 638 043 or DE-PS 34 28 344, have the decisive disadvantage for electronic measuring devices that a disproportionate amount of energy is required for an information transmission compared to the other functions of the measuring device. This is usually negligible for electronic measuring devices with a mains connection, but no longer, for example, for measuring devices powered by batteries.
  • the invention has for its object to provide an inexpensive device of the type mentioned in order to send serial, digital information potential-free from an electronic measuring device via a wire line to a receiver, without the measuring device requiring additional power for transmission.
  • a device for remote reading consists of a transmitter 1, a transmitter 2 for remote reading, a wire line 3 and a receiver 4.
  • the transmitter 1 which is part of a measuring instrument, processes measured values that come from one or more probes 5 .
  • Digital information obtained therefrom passes through short two-wire line 6 to the transmitter 2.
  • a transmitter 8 for potential isolation and an LC oscillator 9 in the transmitter 2 the information is sent to the receiver 4 by means of the wire line 3.
  • the twisted wire line 3 is advantageous.
  • the information transmitted by transmitter 1 is evaluated in receiver 4 and e.g. shown in a display 10.
  • the transmitter 2 is composed of an input-side part, the transmitter 8 for potential isolation between the transmitter 1 on the one hand and the receiver 4 and the output-side part of the transmitter 2 on the other hand.
  • FIG. 2 An embodiment of the input-side part with low-power control of the switch 7 is shown in FIG. 2.
  • the transmitter 1 is connected to the control input of the switch 7 via a signal output 11 via the short two-wire line 6.
  • the use of a field effect is advantageous transistor (FET) 12 as part of the switch 7.
  • the FET 12 is controlled without power via the GATE; however, the FET 12 requires a diode 13 which is connected in the direction of conduction between the start 14 of a secondary winding 15 of a first transformer 16 and the DRAIN connection of the FET 12.
  • the end 17 of the secondary winding 15 leads to the SOURCE connection of the FET 12 and at the same time back to the transmitter 1 as a reference potential.
  • a connection between the start 14 of the secondary winding 15 and a monitoring circuit 18 in the transmitter 1 is advantageous for triggering or releasing an information transmission.
  • a primary winding of the first transformer 16 is galvanically coupled to a secondary winding of a second transformer 20 in FIG. 3 via a connection 19.
  • the two transformers 16, 20 form the transmitter 8 and effect the potential separation between the transmitter 1 and the LC oscillator 9.
  • the primary winding 21 of the second transformer 20 is at the end of the winding to a reference point 22 and at the beginning of the winding to a point 23 of the LC oscillator 9 connected.
  • a design of the transmitter 8 for a frequency in the range of 800 kHz can be implemented particularly inexpensively from commercially available RF interference suppression chokes with a ferrite core, the coupling of the RF chokes using an insulated wire which has three turns on each of the two chokes and via the connection 19 is self-contained, takes place with little capacity.
  • the part of the transmitter 2 on the input side is accommodated in the transmitter 1 (FIG. 4).
  • the secondary winding 15 sits on a first transformer core 16 ⁇ (for example an open U-shape or half a shell core), the pole faces of which are pressed against the inside of a housing wall 24 of the transmitter 1.
  • the housing wall 24, preferably made of plastic, serves as electrical isolation.
  • the primary winding 21 sits on a second transformer core 20 ⁇ of the same shape as the first transformer core 16 ⁇ and is located inside the housing of the transmitter 2.
  • the housing wall 24 and the corresponding housing part of the transmitter 2 advantageously have one by means of permanent magnetic forces, or otherwise fixing centering device so that the transformer cores 16 ⁇ , 20 ⁇ are aligned with each other so that the coupling of the secondary winding 15 with the primary winding 21 via the two transformer cores 16 ⁇ , 20 ⁇ through the housing wall 24 reaches a value that is sufficient for the transmission.
  • a centering device a cuboid projection 25 is placed on the housing wall 24 of the transmitter 1 in FIG. 4 and a corresponding recess 26 is let into the housing of the transmitter 2.
  • the transmitter 2 by placing the transmitter 2 on the housing wall 24 of the transmitter 1, ie the measuring device, guided by the centering device 25, 26, the information stored in a memory of the transmitter 1 can be called up from the measuring device and transmit to recipient 4.
  • the advantage of this design is the lack of a separable electrical connection to the transmitter 1 and the completely closed housing of the transmitter 1.
  • a resonant circuit capacitor 27 of the LC oscillator 9 is connected between the reference point 22 and the point 23 of the primary winding 21 of the second transformer 20 (FIG. 5).
  • active elements of the LC oscillator 9 are integrated in a commercially available module 28 for proximity switches, for example from the SIEMENS type TCA 355.
  • Reference point 22 is connected directly to the MASS connection of block 28 and point 23 to the OSCILLATOR connection of block 28. (The designation of the connections of module 28 follows the SIEMENS data book "Integrated Circuits for Industrial Applications" 1985/86).
  • a first resistor 29 connects the DISTANCE output of the component 28 and the reference point 22.
  • the wire line 3 comes via a second resistor 30 to the AC connections of the bridge rectifier.
  • One branch of the bridge rectifier consists of two diodes 31 and the second branch consists of diodes 32.
  • Zener diodes can advantageously be used as diodes 32 for voltage limitation.
  • the positive DC voltage output + of the bridge rectifier 31, 32 is connected to a smoothing capacitor 34 via a third resistor 33.
  • the other connection point of the smoothing capacitor 34 and the negative DC voltage voltage output of the bridge rectifier 31, 32 are connected to the reference point 22.
  • the voltage across the smoothing capacitor 34 is supplied to the module 28 by means of the U S connection.
  • the Q connection for the signal output (Q output) of the component 28 is connected to the positive DC voltage output + of the bridge rectifier 31, 32 when a two-wire line is used as the wire line 3 via a third Zener diode 35 in the direction of the guide.
  • the Q output of module 28 can also be routed to receiver 4 via a third connection (not shown).
  • the wire line 3 comes into the receiver 4 via connecting means. If a two-wire line is used as the wire line 3, as shown as an exemplary embodiment in FIG. 6, the supply voltage of the transmitter 2 and the received information must be separated in the receiver 4. One wire of the two-wire line is led as an OV reference to an earth point 36 in the receiver 4. The other wire of the two-wire line is connected via a fourth resistor 37 to the positive output of a DC voltage source 38 and to an input 39 of a threshold switch 40. An output 41 of the threshold switch 40 is connected to the display 10 by means of information processing parts of the receiver 4, not shown.
  • the DC voltage source 38 has an electrical voltage of 24 V.
  • the electrical voltage reaches the bridge rectifier 31, 32 via the fourth resistor 37, for example 1 k ⁇ , the wire line 3 and in FIG. 5 the second resistor 30, for example 50 ⁇ .
  • the diodes 32 form an overvoltage protection with the second resistor 30, if 32 Zener diodes with a Zener voltage of 24 V are selected as diodes.
  • the bridge rectifier 31, 32 enables a polarity-independent connection of the wire line 3, that is to say a smooth supply capacitor for the smoothing capacitor 34 is independent of the connection of the wire line 3 through the third resistor 33 Module 28 created. This is advantageous for connecting the wire line 3 by means of clamps.
  • the LC oscillator 9 generates an RF frequency in the oscillating circuit 21, 27 as soon as the supply voltage is present at the U S connection of the module 28.
  • the permissible supply voltage is between 5 V and 30 V and a frequency of the LC oscillator 9 determined by the primary winding 21 and the resonant circuit capacitor 27 must be between 0.015 MHz and 1.5 MHz.
  • the current consumption of module 28 at the U S connection is max. 1 mA.
  • the RF frequency of 876 kHz is determined in the exemplary embodiment by the resonant circuit capacitor 27 of 330 pF and the primary winding 21 of 0.100 mH.
  • the RF amplitude of the LC oscillator 9 is approximately 1.1 V with an undamped resonant circuit 21, 27.
  • the transmitter 8 is designed such that it transforms the HF voltage to three times the value in the secondary winding 15 in order to compensate for the voltage drops across the FET 12 and the diode 13 (FIG. 2).
  • the switch 7 is now closed by preferably narrow pulses from the signal output 11, the secondary winding 15 of the transmitter 8 is short-circuited during a half-wave (in the case of an electromechanical switch during both half-waves) of each period of the HF voltage (FIG. 2).
  • Energy is withdrawn from the resonant circuit 21, 27 via the coupling to the primary winding 21 (FIG. 5) and the HF amplitude at point 23 drops to a value below 0.3 V.
  • the threshold switch contained in the module 28 speaks in such a drop in the HF -Amplitude and sets the signal of the Q output of the component 28 from logic "1" to "0" as long as the RF voltage has this small value.
  • the third zener diode 35 conducts one limited by the fourth resistor 37 (FIG. 6) and the second resistor 30 (FIG. 5) Current to the Q output of module 28 which is set to logic "0".
  • the voltage at the positive DC voltage output + of the bridge rectifier 31, 32 drops to the Zener voltage of the third Zener diode 35, for example 5.1 V.
  • the RC element 34 formed from the third resistor 33 and the smoothing capacitor 34 must have a sufficiently large time constant compared to the length of the pulses from the signal output 11 in FIG. 2, so that the supply voltage of the module 28 in FIG. 5 has a limit value of 5 V and the oscillations stop.
  • the voltage at the input 39 remains above the switch-on point of the threshold switch 40 and the output 41 is e.g. at logical "1".
  • the voltage at the input 39 falls below the switch-off point of the threshold switch 40 and the output 41 is set to logic "0".
  • the further processing of the pulse sequence from the output 41 depends on the task set. For certain purposes, it is sufficient to add up the pulses in a simple counter and display them. Instead of a simple sequence of a number of pulses determined by the measured variable, the transmission of the information e.g. in the manner of the known RS-232 interface.
  • the transmitter 2 according to FIG. 3 is designed with two separate transformers 16, 20, it is advantageous to provide a separable electrical connection between the transmitter 2 and the receiver 4 when temporarily creating the transmission path in FIG. 1 because the wire line 3 is compared to other conceivable disconnection points, for example in FIG. 2, the short two-wire line 6 or at the beginning 14 and end 17 of the secondary winding 15 is least susceptible to faults.
  • An embodiment of the transmitter 1 with a monitoring switch 18 is advantageous with a disconnectable connection to the receiver. Once an electrical connection as above 4, or the transmitter 2 in the version with magnetic coupling according to FIG. 4 is placed on the predetermined location of the housing wall 24 of the transmitter 1, an RF voltage is generated in the secondary winding 15 (FIG. 2).
  • the monitoring circuit 18 detects the HF voltage across the secondary winding 15 and causes the transmitter 1 to transmit the information via the signal output 11.
  • Measuring devices equipped with devices for remote reading of the type described do not require any additional power for reading out information; this is the case with measuring devices with power-limited energy supply, e.g. with battery operation, particularly advantageous.
  • Information can be obtained from the measuring devices via one or more channels, each consisting of a transmitter 1, a transmitter 2, a wire line 3 and a receiver 4, e.g. transmit the meter reading, or include ongoing measurement and control values, to the corresponding receiver 4.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Selective Calling Equipment (AREA)
  • Communication Control (AREA)
EP87106971A 1986-07-24 1987-05-14 Dispositif pour la lecture à distance d'appareils électroniques Expired - Lifetime EP0254828B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87106971T ATE60683T1 (de) 1986-07-24 1987-05-14 Einrichtung zur fernablesung elektronischer geraete.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2967/86 1986-07-24
CH2967/86A CH670168A5 (fr) 1986-07-24 1986-07-24

Publications (2)

Publication Number Publication Date
EP0254828A1 true EP0254828A1 (fr) 1988-02-03
EP0254828B1 EP0254828B1 (fr) 1991-01-30

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EP87106971A Expired - Lifetime EP0254828B1 (fr) 1986-07-24 1987-05-14 Dispositif pour la lecture à distance d'appareils électroniques

Country Status (4)

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EP (1) EP0254828B1 (fr)
AT (1) ATE60683T1 (fr)
CH (1) CH670168A5 (fr)
DE (1) DE3767801D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0451445A2 (fr) * 1990-04-12 1991-10-16 RICHARD HIRSCHMANN GMBH & CO. Méthode de transmission inductive sans contact d'énergie électrique et/ou de signaux et dispositif de transmission inductive sans contact
WO1993019439A1 (fr) * 1992-03-19 1993-09-30 Abb Kent Plc Lecture a distance d'un compteur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108981772B (zh) * 2018-06-12 2020-09-18 杭州绿鲸科技有限公司 一种用于计量表的非接触式无磁防拆检测方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1139055B (de) * 1958-04-25 1962-10-31 Licentia Gmbh Geber fuer eine Fernzaehl- und Fernmesseinrichtung
FR2377611A1 (fr) * 1977-01-13 1978-08-11 Endress Hauser Gmbh Co Systeme de traitement de signaux de mesure
GB2037125A (en) * 1978-12-15 1980-07-02 Vdo Schindling Device for transferring measurement valves
US4292633A (en) * 1978-11-24 1981-09-29 Robertshaw Controls Company Two-wire isolated signal transmitter
FR2500944A1 (fr) * 1981-03-02 1982-09-03 Vdo Schindling Dispositif de transmission sans contact d'une valeur numerique
US4463354A (en) * 1981-12-09 1984-07-31 Sears Lawrence M Apparatus for communicating utility usage related information from a utility usage location to a portable utility usage registering device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1139055B (de) * 1958-04-25 1962-10-31 Licentia Gmbh Geber fuer eine Fernzaehl- und Fernmesseinrichtung
FR2377611A1 (fr) * 1977-01-13 1978-08-11 Endress Hauser Gmbh Co Systeme de traitement de signaux de mesure
US4292633A (en) * 1978-11-24 1981-09-29 Robertshaw Controls Company Two-wire isolated signal transmitter
GB2037125A (en) * 1978-12-15 1980-07-02 Vdo Schindling Device for transferring measurement valves
FR2500944A1 (fr) * 1981-03-02 1982-09-03 Vdo Schindling Dispositif de transmission sans contact d'une valeur numerique
US4463354A (en) * 1981-12-09 1984-07-31 Sears Lawrence M Apparatus for communicating utility usage related information from a utility usage location to a portable utility usage registering device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0451445A2 (fr) * 1990-04-12 1991-10-16 RICHARD HIRSCHMANN GMBH & CO. Méthode de transmission inductive sans contact d'énergie électrique et/ou de signaux et dispositif de transmission inductive sans contact
EP0451445A3 (en) * 1990-04-12 1993-02-24 Richard Hirschmann Gmbh & Co. Contactless inductive transmission method of electrical energy and/or signals and contactless inductive transmission device
WO1993019439A1 (fr) * 1992-03-19 1993-09-30 Abb Kent Plc Lecture a distance d'un compteur
US5594431A (en) * 1992-03-19 1997-01-14 Abb Kent Plc Remote meter reading
AU675217B2 (en) * 1992-03-19 1997-01-30 Abb Kent Plc Remote meter reading

Also Published As

Publication number Publication date
EP0254828B1 (fr) 1991-01-30
DE3767801D1 (de) 1991-03-07
ATE60683T1 (de) 1991-02-15
CH670168A5 (fr) 1989-05-12

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