EP0780822B1 - Method and device for contactless transmission of measured values - Google Patents
Method and device for contactless transmission of measured values Download PDFInfo
- Publication number
- EP0780822B1 EP0780822B1 EP96203531A EP96203531A EP0780822B1 EP 0780822 B1 EP0780822 B1 EP 0780822B1 EP 96203531 A EP96203531 A EP 96203531A EP 96203531 A EP96203531 A EP 96203531A EP 0780822 B1 EP0780822 B1 EP 0780822B1
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- European Patent Office
- Prior art keywords
- measuring unit
- base station
- measured data
- transceiver
- evaluation circuit
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- 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 method for the contactless transmission of measured values and a corresponding arrangement for the contactless transmission of measured values.
- Measured values used by those measuring points that are not easily accessible and whose measured values are not required continuously. These include, for example many consumption data measurements as well as temperature measurements like the measurement a room temperature to control a heating system. Even in medical Range when physiological readings from an implanted site over such procedures or Arrangements can be used advantageously.
- WO 95-27272 a method and a device are known with which measured values can be detected by a reader from a remote measuring point.
- a sensor and an electronic interface circuit which is operated by a local energy source and which the measured values of the Sensor converts into preferably digital measurement data.
- both measuring point as well as a reader with a transmitting / receiving arrangement.
- the interface circuitry uses little energy from the energy source switched inactive for longer periods and only periodically switched ready to receive. If data is to be transferred, that sends Reader a data request signal, if necessary several times in succession until a Request signal falls within a period in which the interface circuit is active is switched. This interface circuit then causes a Measured value or a sequence of measured values. This sending of data is required relatively much energy from the energy source, even if only for a short time, so that the energy source is strong, especially in the case of frequent measurement data transmission is loaded and has a short lifespan.
- EP 0 601 739 A2 describes a method and an arrangement for data transmission known from a measuring point with the aid of a query circuit, the Circuit of the measuring point and the query circuit via antennas with each other are coupled. These antennas are used to power the sensor and delivered for converting the measured values and for their transmission. there the measuring point therefore does not need its own energy source. It can be a measurement however only take place if the interface circuit is active. It can also on this way, practically only one measuring point is detected by an interface circuit become. On the other hand, this cannot be the case with this known method that a measurement or transmission of measurement data is no longer possible because an energy source is exhausted prematurely because the query circuit is easily accessible or is stationary and therefore has sufficient energy reserves can be.
- the invention has for its object a method or an arrangement specify with which the measurement data is acquired from preferably several measuring points can be, these measuring points contain energy sources, their lifespan is as long as possible with small dimensions.
- the energy source of the or each measuring point is only used for recording and converting the measured values, while for transferring, i.e. for sending the measurement data from the measuring point to a base station, which is carried out by energy sent to the base station is used.
- the base station especially if this is for transmission of measured values from several measuring points can be used with such Transmission power are equipped that even at a certain distance from the Sufficient energy is still received in this measuring point for transmission the measured values can be used.
- Measured values of the sensor are converted into measured data and in a memory of the evaluation circuit be cached.
- the data collection between the Transmission processes must be powered by the energy source of the measuring point.
- the stored measurement data are then transferred from memory for transmission transmitted to the base station via the transmitter / receiver of the measuring point.
- the use of the energy received in the measuring point by the base station to send the measurement data can be done in that from this energy, the for example via a coil or a capacitor, one DC voltage is generated, which is used to feed the transmitter of the measuring point becomes.
- This transmitter then preferably transmits on a different frequency than that Base station.
- the base station and the Measuring point inductively coupled to each other via an antenna designed as a coil are that a controllable impedance is connected to the coil of the measuring point is controlled by the measurement data, and that the change in the base station Impedance is evaluated.
- This principle is basically with data exchange arrangements known with a portable data carrier and a fixed station, for example from DE 43 23 530 A1, in which also the recharging of an energy store is described by means of the energy emitted by the fixed station.
- the invention is based on an embodiment shown in the figure explained in more detail.
- the base station 1 contains a control arrangement 14 which is generally formed by a processor, in particular a microprocessor with further elements.
- This control arrangement 14 controls a transmitter / receiver 12, which contains, inter alia, an oscillator and a demodulator. These are connected to a series resonant circuit comprising a series connection of a capacitor 11 and a coil 10, this coil representing an antenna.
- this coil 10 is inductively coupled to a coil 20 of the measuring point 2 , which is the antenna of this measuring point.
- the coil 20 forms a parallel resonant circuit with a capacitor 21, which is connected, inter alia, to a rectifier 22 which generates a DC voltage from the voltage induced in the coil 20. If this DC voltage has a sufficiently large value, a charging voltage for an energy store 26, which is shown here as an accumulator, is generated in a charging circuit 24 and the accumulator 26 is charged with it.
- the two voltage poles of the accumulator 26 are designated V S and V D and are connected to the correspondingly drawn supply voltage connections of two elements 32 and 34, which are explained below.
- the parallel resonant circuit consisting of the coil 20 and the capacitor 21 is also connected to a transmitter 30 and a receiver 28 of the measuring point 2.
- the receiver 28 demodulates a signal with which the transmitter / receiver 12 of the base station 1 has modulated the oscillation emitted from the coil 10 and the capacitor 11 via the series resonant circuit.
- This modulation contains, in particular, a command for the measuring station 2 to subsequently transmit measurement data after this command.
- This command is fed to an evaluation circuit 34, which is also easier Microprocessor can be designed and coupled to a sensor 36 which gives measured values.
- a measured value can be, for example, an analog one electrical signal can be shown, and this is in the evaluation circuit 34 in digital measurement data implemented.
- the transmitter 30 contains the series connection of a switch and an impedance Z.
- this impedance can be a resistor which loads the resonant circuit from the coil 20 and the capacitor 21 when the switch is closed.
- This additional load can be evaluated in the transmitter / receiver 12 of the base station 1 , for example in that a higher current flows from the coil 10 and the capacitor 11 of the base station 2 in the series resonant circuit when there is an additional load in the measuring point 1 .
- the impedance Z can also be designed, for example, as a capacitor, so that when the switch is closed, the resonance frequency of the parallel resonant circuit comprising the coil 20 and the capacitor 21 and the then capacitive impedance Z are tuned to another value. This can also be evaluated in the transmitter / receiver 12.
- the series resonant circuit consists of the coil 10 and the capacitor 11 and the parallel resonant circuit comprising the coil 20 and the capacitor 21 at least with the switch in transmitter 30 open, to substantially the same Resonance frequency are tuned.
- the transmission of the measured values from the measuring point 2 to the base station 1 thus takes place in that only one switch is closed or opened.
- the control signal required to control the switch requires very little power, especially if the switch is designed as a field effect transistor. If the evaluation circuit 34 and the non-volatile memory 32 are also implemented using MOS technology, very little electrical energy from the accumulator 26 is required for their operation. As a result, it is possible that, even during the time in which the measuring point 2 is not coupled to the base station 1 or the latter does not emit a signal, measured values from the sensor 36 are repeatedly converted into measured data and stored in the memory 32 one after the other.
- the memory 32 can also be used to store a program according to which the arrangement 34 operates.
- This program or parts of programs can also be written into the memory 32 by the base station 1 via the receiver 28 of the measuring point 2 .
- the evaluation program for the measured values of sensor 36 can be changed, for example, during operation of the measuring point.
- the elements 22, 24 and 28 to 34 can be conveniently integrated into a single Circuit can be summarized to be as small and as possible to realize inexpensive construction. Via the interface to sensor 36 or even cheaper to an interface led out of the integrated circuit external memory can then be added to or even instead of the memory 32 Sensors 36 are connected, making the integrated circuit as an enlarged Memory of a data exchange arrangement is used.
Description
Die Erfindung betrifft ein Verfahren zum kontaktlosen Übertragen von Meßwerten sowie eine entsprechende Anordnung zum kontaktlosen Übertragen von Meßwerten.The invention relates to a method for the contactless transmission of measured values and a corresponding arrangement for the contactless transmission of measured values.
Verfahren bzw. Anordnungen zum kontaktlosen Übertragen werden bevorzugt für Meßwerte von solchen Meßstellen verwendet, die nicht leicht zugänglich sind und deren Meßwerte nicht kontinuierlich benötigt werden. Hierzu gehören beispielsweise viele Verbrauchsdatenmessungen sowie Temperaturmessungen wie die Messung einer Raumtemperatur zur Steuerung einer Heizungsanlage. Auch im medizinischen Bereich, wenn physiologische Meßwerte von einer implantierten Meßstelle über einen längeren Zeitraum benötigt werden, sind derartige Verfahren bzw. Anordnungen vorteilhaft einsetzbar.Methods or arrangements for contactless transmission are preferred for Measured values used by those measuring points that are not easily accessible and whose measured values are not required continuously. These include, for example many consumption data measurements as well as temperature measurements like the measurement a room temperature to control a heating system. Even in medical Range when physiological readings from an implanted site over such procedures or Arrangements can be used advantageously.
Aus der WO 95-27272 ist ein Verfahren und ein Gerät bekannt, mit dem Meßwerte von einer entfernten Meßstelle von einem Lesegerät erfaßt werden können. An der Meßstelle ist ein Sensor und eine elektronische Schnittstellenschaltung vorhanden, die von einer örtlichen Energiequelle betrieben wird und die die Meßwerte des Sensors in vorzugsweise digitale Meßdaten umsetzt. Ferner sind sowohl Meßstelle als auch Lesegerät mit einer Sende/Empfangsanordnung versehen. Um möglichst wenig Energie aus der Energiequelle zu verbrauchen, wird die Schnittstellenschaltung während längerer Zeitabschnitte inaktiv geschaltet und nur periodisch empfangsbereit geschaltet. Wenn Daten übertragen werden sollen, sendet das Lesegerät ein Datenanforderungssignal aus, ggf. mehrmals hintereinander, bis ein Anforderungssignal in eine Zeitspanne fällt, in der die Schnittstellenschaltung aktiv geschaltet ist. Diese Schnittstellenschaltung veranlaßt daraufhin das Aussenden eines Meßwerts oder eine Folge von Meßwerten. Dieses Aussenden von Daten benötigt relativ viel Energie aus der Energiequelle, wenn auch nur kurze Zeit, so daß insbesondere bei einer häufigen Meßdatenübertragung die Energiequelle stark belastet wird und eine geringe Lebensdauer hat.From WO 95-27272 a method and a device are known with which measured values can be detected by a reader from a remote measuring point. At the Measuring point there is a sensor and an electronic interface circuit, which is operated by a local energy source and which the measured values of the Sensor converts into preferably digital measurement data. Furthermore, both measuring point as well as a reader with a transmitting / receiving arrangement. To be as possible The interface circuitry uses little energy from the energy source switched inactive for longer periods and only periodically switched ready to receive. If data is to be transferred, that sends Reader a data request signal, if necessary several times in succession until a Request signal falls within a period in which the interface circuit is active is switched. This interface circuit then causes a Measured value or a sequence of measured values. This sending of data is required relatively much energy from the energy source, even if only for a short time, so that the energy source is strong, especially in the case of frequent measurement data transmission is loaded and has a short lifespan.
Aus der EP 0 601 739 A2 ist ein Verfahren und eine Anordnung zur Datenübertragung von einer Meßstelle mit Hilfe einer Abfrageschaltung bekannt, wobei die Schaltung der Meßstelle und die Abfrageschaltung über Antennen miteinander gekoppelt sind. Über diese Antennen wird die Energie zum Betreiben des Sensors und zum Umsetzen der Meßwerte und für deren Übertragung geliefert. Dabei benötigt die Meßstelle also keine eigene Energiequelle. Dabei kann eine Messung jedoch nur erfolgen, wenn die Schnittstellenschaltung aktiv ist. Außerdem kann auf diese Weise von einer Schnittstellenschaltung praktisch nur eine Meßstelle erfaßt werden. Andererseits kann bei diesem bekannten Verfahren nicht der Fall eintreten, daß eine Messung bzw. Übertragung von Meßdaten nicht mehr möglich ist, weil eine Energiequelle vorzeitig erschöpft ist, da die Abfrageschaltung leicht zugänglich bzw. stationär ist und daher mit ausreichend großen Energiereserven versehen werden kann.EP 0 601 739 A2 describes a method and an arrangement for data transmission known from a measuring point with the aid of a query circuit, the Circuit of the measuring point and the query circuit via antennas with each other are coupled. These antennas are used to power the sensor and delivered for converting the measured values and for their transmission. there the measuring point therefore does not need its own energy source. It can be a measurement however only take place if the interface circuit is active. It can also on this way, practically only one measuring point is detected by an interface circuit become. On the other hand, this cannot be the case with this known method that a measurement or transmission of measurement data is no longer possible because an energy source is exhausted prematurely because the query circuit is easily accessible or is stationary and therefore has sufficient energy reserves can be.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren bzw. eine Anordnung anzugeben, mit der die Meßdaten von vorzugsweise mehreren Meßstellen erfaßt werden können, wobei diese Meßstellen Energiequellen enthalten, deren Lebensdauer bei kleinen Abmessungen möglichst lang ist.The invention has for its object a method or an arrangement specify with which the measurement data is acquired from preferably several measuring points can be, these measuring points contain energy sources, their lifespan is as long as possible with small dimensions.
Zur Lösung dieser Aufgabe wird die Energiequelle der bzw. jeder Meßstelle nur zum Aufnehmen und Umsetzen der Meßwerte verwendet, während zum Übertragen, d.h. zum Aussenden der Meßdaten von der Meßstelle zu einer Basisstation, die von der Basisstation ausgesendete Energie verwendet wird. Dadurch wird die Energiequelle der Meßstelle zum Aussenden der Daten nicht belastet und hat somit eine längere Lebensdauer. Die Basisstation, insbesondere wenn diese für die Übertragung von Meßwerten von mehreren Meßstellen verwendet wird, kann mit einer derartigen Sendeleistung ausgestattet werden, daß auch bei einer gewissen Entfernung von der Meßstelle in dieser noch genügend Energie empfangen wird, die zum Übertragen der Meßwerte verwendet werden kann.To solve this problem, the energy source of the or each measuring point is only used for recording and converting the measured values, while for transferring, i.e. for sending the measurement data from the measuring point to a base station, which is carried out by energy sent to the base station is used. This becomes the energy source the measuring point for sending the data is not charged and therefore has a longer lifetime. The base station, especially if this is for transmission of measured values from several measuring points can be used with such Transmission power are equipped that even at a certain distance from the Sufficient energy is still received in this measuring point for transmission the measured values can be used.
Eine noch längere Lebensdauer der Energiequelle wird möglich, wenn in der Meßstelle die von der Basisstation empfangene Energie dazu verwendet wird, um der Energiequelle Energie zum Aufladen bzw. zum Nachladen zuzuführen. Bei entsprechender Sendedauer der Basisstation ist es dann möglich, die gesamte Energie, die zwischen zwei Übertragungsvorgängen in der Meßstelle verbraucht wurde, wieder in die Energiequelle nachzuladen, so daß ein nahezu zeitlich unbegrenzter Betrieb der Meßstelle auch bei sehr kleinen Energiequellen möglich ist, sofern diese ausreichend Energie speichern, die für die zwischen zwei Übertragungsvorgängen in der Meßstelle stattfindenden Funktionen notwendig ist.An even longer life of the energy source is possible if in the Measuring point the energy received by the base station is used to to supply the energy source with energy for charging or recharging. at the corresponding transmission time of the base station, it is then possible to cover the entire Energy that is consumed between two transmission processes in the measuring point was to reload into the energy source, so that an almost unlimited time Operation of the measuring point is possible even with very small energy sources, provided that they store enough energy for between two transmission processes functions taking place in the measuring point is necessary.
Dies ist besonders dann wichtig, wenn die Zeitpunkte der Übertragungen von Meßdaten zeitlich relativ weit auseinander liegen und in den Zwischenzeiten häufig Meßwerte des Sensors in Meßdaten umgesetzt und in einem Speicher der Auswerteschaltung zwischengespeichert werden. Die Datenerfassung zwischen den Übertragungsvorgängen muß von der Energiequelle der Meßstelle gespeist werden. Die gespeicherten Meßdaten werden dann für eine Übertragung aus dem Speicher über den Sender/Empfänger der Meßstelle zur Basisstation übertragen.This is particularly important when the times of the transfers from Measurement data are relatively far apart in time and often in the meantime Measured values of the sensor are converted into measured data and in a memory of the evaluation circuit be cached. The data collection between the Transmission processes must be powered by the energy source of the measuring point. The stored measurement data are then transferred from memory for transmission transmitted to the base station via the transmitter / receiver of the measuring point.
Die Verwendung der in der Meßstelle von der Basisstation empfangenen Energie zum Aussenden der Meßdaten kann dadurch erfolgen, daß aus dieser Energie, die beispielsweise über eine Spule oder einen Kondensator aufgenommen wird, eine Gleichspannung erzeugt wird, die zum Speisen des Senders der Meßstelle verwendet wird. Dieser Sender sendet dann vorzugsweise auf einer anderen Frequenz als die Basisstation. Eine andere Möglichkeit besteht darin, wenn die Basisstation und die Meßstelle induktiv über je eine als Spule ausgeführte Antenne miteinander gekoppelt sind, daß an die Spule der Meßstelle eine steuerbare Impedanz angeschlossen ist, die von den Meßdaten gesteuert wird, und daß in der Basisstation die Änderung der Impedanz ausgewertet wird. Dieses Prinzip ist grundsätzlich bei Datenaustauschanordnungen mit einem tragbaren Datenträger und einer festen Station bekannt, beispielsweise aus der DE 43 23 530 A1, in der auch das Nachladen eines Energiespeichers mittels der von der festen Station ausgesendeten Energie beschrieben ist.The use of the energy received in the measuring point by the base station to send the measurement data can be done in that from this energy, the for example via a coil or a capacitor, one DC voltage is generated, which is used to feed the transmitter of the measuring point becomes. This transmitter then preferably transmits on a different frequency than that Base station. Another possibility is if the base station and the Measuring point inductively coupled to each other via an antenna designed as a coil are that a controllable impedance is connected to the coil of the measuring point is controlled by the measurement data, and that the change in the base station Impedance is evaluated. This principle is basically with data exchange arrangements known with a portable data carrier and a fixed station, for example from DE 43 23 530 A1, in which also the recharging of an energy store is described by means of the energy emitted by the fixed station.
Die Erfindung wird anhand eines in der Figur dargestellten Ausführungsbeispiels näher erläutert.The invention is based on an embodiment shown in the figure explained in more detail.
Darin sind die für die Erfindung wichtigsten Elemente einer Basisstation 1 und einer
Meßstelle 2 dargestellt. Die Basisstation 1 enthält eine Steueranordnung 14, die
allgemein durch einen Prozessor, insbesondere einen Mikroprozessor mit weiteren
Elementen gebildet wird. Diese Steueranordnung 14 steuert einen
Sender/Empfänger 12, der u.a. einen Oszillator und einen Demodulator enthält.
Diese sind an einen Reihenschwingkreis aus einer Reihenschaltung eines Kondensators
11 und einer Spule 10 angeschlossen, wobei diese Spule eine Antenne
darstellt.It shows the elements of a
Diese Spule 10 ist während einer Übertragung von Meßwerten mit einer Spule 20
der Meßstelle 2 induktiv gekoppelt, die die Antenne dieser Meßstelle darstellt. Die
Spule 20 bildet mit einem Kondensator 21 einen Parallelschwingkreis, der u.a. mit
einem Gleichrichter 22 verbunden ist, der aus der in der Spule 20 induzierten
Spannung eine Gleichspannung erzeugt. Wenn diese Gleichspannung einen genügend
großen Wert hat, wird in einer Ladeschaltung 24 eine Ladespannung für einen
Energiespeicher 26, der hier als Akkumulator dargestellt ist, erzeugt und der
Akkumulator 26 damit aufgeladen. Die beiden Spannungspole des Akkumulators 26
sind mit VS und VD bezeichnet und mit den entsprechend gezeichneten Speisespannungsanschlüssen
von zwei Elementen 32 und 34 verbunden, die nachfolgend
erläutert werden. During the transmission of measured values, this
Der Parallelschwingkreis aus der Spule 20 und dem Kondensator 21 ist ferner mit
einem Sender 30 und einem Empfänger 28 der Meßstelle 2 verbunden. Der
Empfänger 28 demoduliert ein Signal, mit dem der Sender/Empfänger 12 der
Basisstation 1 die über den Reihenschwingkreis aus der Spule 10 und dem Kondensator
11 ausgesendete Schwingung moduliert hat. Diese Modulation enthält insbesondere
ein Kommando für die Meßstation 2, nachfolgend nach diesem
Kommando Meßdaten zu übertragen.The parallel resonant circuit consisting of the
Dieses Kommando wird einer Auswerteschaltung 34 zugeführt, die auch als einfacher
Mikroprozessor ausgeführt sein kann und die mit einem Sensor 36 gekoppelt
ist, der Meßwerte abgibt. Ein Meßwert kann beispielsweise durch ein analoges
elektrisches Signal dargestellt sein, und dieses wird in der Auswerteschaltung 34 in
digitale Meßdaten umgesetzt.This command is fed to an
Diese Meßdaten werden einem nichtflüchtigen Speicher 32 zugeführt und darin
eingeschrieben. Wenn von der Basisstation 1 ein Kommando zum Übertragen von
Meßdaten im Empfänger 28 erkannt wird, steuert die Auswerteschaltung 34 den
Speicher 32 an und liest die gespeicherten Meßwerte aus und führt diese dem
Sender 30 zu. Der Sender 30 enthält hier die Reihenschaltung eines Schalters und
einer Impedanz Z. Diese Impedanz kann im einfachsten Fall ein Widerstand sein,
der bei geschlossenem Schalter den Schwingkreis aus der Spule 20 und dem
Kondensator 21 belastet. Diese zusätzliche Belastung kann in dem
Sender/Empfänger 12 der Basisstation 1 ausgewertet werden, beispielsweise
dadurch, daß bei einer zusätzlichen Belastung in der Meßstelle 1 in dem Reihenschwingkreis
aus der Spule 10 und dem Kondensator 11 der Basisstation 2 ein
höherer Strom fließt. Die Impedanz Z kann jedoch auch beispielsweise als Kondensator
ausgeführt sein, so daß bei geschlossenem Schalter die Resonanzfrequenz des
Parallelschwingkreises aus der Spule 20 und dem Kondensator 21 sowie der dann
kapazitiven Impedanz Z auf einen anderen Wert abgestimmt wird. Auch dies kann in
dem Sender/Empfänger 12 ausgewertet werden. These measurement data are fed to a
Es sei bemerkt, daß der Reihenschwingkreis aus der Spule 10 und dem Kondensator
11 sowie der Parallelschwingkreis aus der Spule 20 und dem Kondensator 21
zumindest bei offenem Schalter in dem Sender 30 auf die im wesentlichen gleiche
Resonanzfrequenz abgestimmt sind.It should be noted that the series resonant circuit consists of the
Das Übertragen der Meßwerte von der Meßstelle 2 zur Basisstation 1 erfolgt also
dadurch, daß lediglich ein Schalter geschlossen bzw. geöffnet wird. Das für die
Steuerung des Schalters benötigte Steuersignal erfordert nur eine äußerst geringe
Leistung, insbesondere wenn der Schalter als Feldeffekttransistor ausgeführt ist.
Wenn auch die Auswerteschaltung 34 und der nichtflüchtige Speicher 32 in
MOS-Technik ausgeführt sind, wird für deren Betrieb nur sehr wenig elektrische
Energie aus dem Akkumulator 26 benötigt. Dadurch ist es möglich, daß auch
während der Zeit, in der die Meßstelle 2 nicht mit der Basisstation 1 gekoppelt ist
bzw. letztere kein Signal aussendet, wiederholt Meßwerte des Sensors 36 in Meßdaten
umgesetzt und im Speicher 32 nacheinander abgespeichert werden. Dies kann
zu wiederholten Zeitpunkten geschehen, wofür die Auswerteschaltung 34 dann mit
einer zeitgesteuerten Meßschaltung versehen ist, oder wenn das vom Sensor 36
gelieferte Meßsignal bestimmte Bedingungen erfüllt, beispielsweise bestimmte
Grenzwerte oder Änderungsgeschwindigkeiten überschreitet. Für die Anzahl der im
Speicher 32 abgespeicherten Meßdaten sowie die gesamte Betriebsdauer der Meßstelle
2 zwischen zwei Übertragungen von Meßdaten zur Basisstation steht nahezu
die gesamte Kapazität des Akkumulators 26 zur Verfügung, da er bei jeder Übertragung
wieder auf seine maximale Kapazität aufgeladen werden kann, indem die
Basisstation genügend lange ein Signal aussendet.The transmission of the measured values from the
Der Speicher 32, genauer ein Teil davon, kann auch dazu verwendet werden, ein
Programm zu speichern, nach dem die Anordnung 34 arbeitet. Dieses Programm
oder Teile von Programmen können auch von der Basisstation 1 über den
Empfänger 28 der Meßstelle 2 in den Speicher 32 eingeschrieben werden. Dadurch
kann beispielsweise während des Betriebs der Meßstelle das Auswerteprogramm für
die Meßwerte des Sensors 36 geändert werden.The
Die Elemente 22, 24 sowie 28 bis 34 können zweckmäßig in einer einzigen integrierten
Schaltung zusammengefaßt werden, um einen möglichst kleinen und
kostengünstigen Aufbau zu verwirklichen. Über die Schnittstelle zum Sensor 36 oder
noch günstiger an eine aus der integrierten Schaltung herausgeführten Schnittstelle
zum Speicher 32 können dann externe Speicher zusätzlich oder sogar anstelle des
Sensors 36 angeschlossen werden, wodurch die integrierte Schaltung als vergrößerter
Speicher einer Datenaustauschanordnung dient.The
Claims (11)
- A method for contactless transmission of measured values of at least one measuring unit at which the measured values are produced by a sensor and converted into measured data in an evaluation circuit operated by a local power source which measured data are transmitted to a base station when this base station is brought in spatial proximity to the measuring unit and transmits a signal to the measuring unit, characterized in that the power source is used only for operating the evaluation circuit and in that the measured data are transmitted from the measuring unit to the base station with the power contained in the signal which is transmitted from the base station to the measuring unit.
- A method as claimed in Claim 1, characterized in that the power of the signal transmitted by the base station and received in the measuring unit is furthermore used for supplying additional power to the power source.
- A method as claimed in Claim I or 2, characterized in that the evaluation circuit is operated at specific instants to convert measured signals of the sensor into measured data and buffer these measured data in a memory of the evaluation circuit, the measured data being transmitted from the memory to the base station irrespective of their acquisition time.
- A method as claimed in any one of the Claims 1 to 3, in which the base station and the measuring unit are inductively coupled by a respective coil each, characterized in that the measured data are transmitted by changing an impedance coupled to the coil of the measuring unit and evaluating the change of impedance in the base station.
- A device for contactless transmission of measured values of at least one measuring unit, comprising for each measuring unit at least one sensor and one evaluation circuit for converting the measured values of the sensor into measured data, a power source and a transceiver for transmitting measured data and for receiving signals, at least one base station which comprises a control circuit and a transceiver for transmitting signals to the transceiver of the measuring unit and for receiving measured data from the measuring unit, the transceiver of the measuring unit and of the base station being coupled at times and the measuring unit transmitting measured data only when the signal is received from the base station, characterized in that the power source of the measuring unit is connected to a supply voltage terminal of only the evaluation circuit and in that the transmitter of the measuring unit transmits the measured data to the base station only with the power received from the base station.
- A device as claimed in Claim 6, characterized in that a charging circuit is connected to the transceiver of the measuring unit, which load circuit produces a voltage for charging the power source when power is received in the transceiver.
- A device as claimed in Claim 5 or 6, characterized in that the evaluation circuit comprises a measuring controller to change the evaluation circuit to a converting mode only during predefined first time periods and to a power-saving mode during the further time periods and in that the evaluation circuit comprises a memory for storing measured data converted in first time periods and in that an output of the memory is coupled to the transceiver of the measuring unit.
- A device as claimed in any one of the Claims 5 to 7 in which the transceiver of both measuring unit and base station have a respective antenna arranged as a coil, which antennas can be inductively coupled to each other, characterized in that an impedance controllable by the evaluation circuit is connected to the coil of the measuring unit.
- A measuring unit for a device as claimed in any one of the Claims 5 to 8, comprising a sensor for producing measured values, a power source, an evaluation circuit for converting the measured values into measured data and a transceiver for transmitting measured data and for receiving signals, characterized in that the power source is coupled only to a supply voltage terminal of the evaluation circuit and in that the transceiver is arranged for transmitting measured data only on reception of a signal while using the power received with this signal.
- A measuring unit as claimed in Claim 9, characterized in that a memory is provided for buffering measured data the output of which memory being coupled to the transceiver, while the evaluation circuit, the memory and the transceiver are incorporated in an integrated circuit.
- A measuring unit as claimed in Claim 10, characterized in that a data port of the memory is accessible from outside the integrated circuit, so that further memories can be connected.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19547684A DE19547684A1 (en) | 1995-12-20 | 1995-12-20 | Method and arrangement for contactless transmission |
DE19547684 | 1995-12-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0780822A1 EP0780822A1 (en) | 1997-06-25 |
EP0780822B1 true EP0780822B1 (en) | 2003-07-09 |
Family
ID=7780728
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96203531A Expired - Lifetime EP0780822B1 (en) | 1995-12-20 | 1996-12-13 | Method and device for contactless transmission of measured values |
Country Status (4)
Country | Link |
---|---|
US (1) | US5859873A (en) |
EP (1) | EP0780822B1 (en) |
JP (1) | JP3842854B2 (en) |
DE (2) | DE19547684A1 (en) |
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US8115635B2 (en) | 2005-02-08 | 2012-02-14 | Abbott Diabetes Care Inc. | RF tag on test strips, test strip vials and boxes |
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-
1996
- 1996-12-13 EP EP96203531A patent/EP0780822B1/en not_active Expired - Lifetime
- 1996-12-13 DE DE59610590T patent/DE59610590D1/en not_active Expired - Lifetime
- 1996-12-17 JP JP33682796A patent/JP3842854B2/en not_active Expired - Fee Related
- 1996-12-18 US US08/768,473 patent/US5859873A/en not_active Expired - Lifetime
Cited By (5)
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US8115635B2 (en) | 2005-02-08 | 2012-02-14 | Abbott Diabetes Care Inc. | RF tag on test strips, test strip vials and boxes |
US8223021B2 (en) | 2005-02-08 | 2012-07-17 | Abbott Diabetes Care Inc. | RF tag on test strips, test strip vials and boxes |
US8358210B2 (en) | 2005-02-08 | 2013-01-22 | Abbott Diabetes Care Inc. | RF tag on test strips, test strip vials and boxes |
US8390455B2 (en) | 2005-02-08 | 2013-03-05 | Abbott Diabetes Care Inc. | RF tag on test strips, test strip vials and boxes |
US8542122B2 (en) | 2005-02-08 | 2013-09-24 | Abbott Diabetes Care Inc. | Glucose measurement device and methods using RFID |
Also Published As
Publication number | Publication date |
---|---|
EP0780822A1 (en) | 1997-06-25 |
JPH09215228A (en) | 1997-08-15 |
DE19547684A1 (en) | 1997-06-26 |
DE59610590D1 (en) | 2003-08-14 |
JP3842854B2 (en) | 2006-11-08 |
US5859873A (en) | 1999-01-12 |
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