EP0883097B1 - Device for transmitting signals between a transmitter and a receiver - Google Patents

Device for transmitting signals between a transmitter and a receiver Download PDF

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Publication number
EP0883097B1
EP0883097B1 EP98109740A EP98109740A EP0883097B1 EP 0883097 B1 EP0883097 B1 EP 0883097B1 EP 98109740 A EP98109740 A EP 98109740A EP 98109740 A EP98109740 A EP 98109740A EP 0883097 B1 EP0883097 B1 EP 0883097B1
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EP
European Patent Office
Prior art keywords
voltage
transmitter location
current
transmitter
signal
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EP98109740A
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German (de)
French (fr)
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EP0883097A2 (en
EP0883097A3 (en
Inventor
Peter KLÖFER
Jürgen KRÜGER
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Endress and Hauser SE and Co KG
Endress and Hauser Deutschland Holding GmbH
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Endress and Hauser SE and Co KG
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    • 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 an arrangement for signal transmission between a donor station and a receiving station, which are interconnected by a two-wire line are, via which a variable between two limit values analog signal current is transmitted, which one in represents the measured value detected by a sensor and that required for the operation of the donor agency Supply current forms, with the encoder unit a circuit has a constant operating voltage for the Generated donor station, and one in the donor station controllable power source is provided, which over the Two-wire current flowing depending on the Measured value determined.
  • the invention is therefore based on the object To design the arrangement of the type specified at the beginning, that the power available in the encoder is optimized becomes.
  • the one that generates the operating voltage for the encoder Circuit is a switching regulator, and that in the encoder position a voltage source is provided, the output voltage changes opposite to the signal current and which the Input voltage of the step-down switching regulator forms.
  • the switching regulator used in the arrangement according to the invention has the property that he applies the to him Converts input voltage into a constant output voltage, where, apart from internal losses, its output power equal to its performance on the input side is. This can increase the available input power be that its input voltage by changing the Output voltage of the voltage source opposite to Measured value is changed. In the presence of a low Measured value, which accordingly also a low signal current is the input voltage of the switching regulator increased while at a large reading, accordingly also results in a large signal current is reduced.
  • From DE-C-39 34 007 is the use of a switching regulator to generate the supply voltage for a Transducer circuit and a sensor known, but it is with this known arrangement, the input voltage is not possible of the switching regulator to influence the available ones Affect performance.
  • FIG. 1 shows schematically a transmitter point 10, which is connected to a receiving point 12 via a two-wire line 14.
  • the transmitter point 10 is a measuring point in which a measured value (for example temperature, pressure, humidity, fill level, flow) is detected with the aid of a sensor 16.
  • the encoder point 10 does not contain its own energy source, but obtains the supply current required for its operation via the two-wire line 14 from a voltage source 18 contained in the receiving point 12. Via the same two-wire line 14, a measured value signal representing the measured value just measured is sent from the encoder point 10 to the receiving point 14 transferred.
  • the measured value signal is a signal current I S flowing over the two-wire line 14, which can change between two predetermined values (usually the current values 4 mA and 20 mA).
  • the voltage source 18 supplies a direct voltage
  • the measuring current I S is a direct current.
  • the transmitter 10 already contains the data acquisition mentioned sensor 16 and a transducer circuit connected to it 20, the outputs 22 and 24 two each outputs detected measured value signals. The purpose these two signals will be explained later.
  • the receiving point 12 contains an evaluation circuit 26 which obtains the measured value information from the signal current I S transmitted via the two-wire line 14.
  • a measuring resistor 28 is inserted into the two-wire line, at which a voltage U M is generated which is proportional to the signal current I S transmitted via the two-wire line and which is fed to the evaluation circuit 26.
  • a resistor 30 is also shown in the receiving point 12, which, in addition to the resistor 28, represents the load which is on the receiver side on the two-wire line 14.
  • the signal current I S is set in the transmitter point 10 by a controllable current source 32, to which the signal emitted by the transducer circuit 20 at the output 24 is fed as a control signal for the signal current I S to be determined. Depending on the measured value recorded in each case, the signal current I S flowing in the two-wire line is thus determined by a corresponding control of the current source 32.
  • the donor station contains 10 a controllable voltage source 34 and a switching regulator 36, whose task is to maintain a constant operating voltage for the transducer circuit 20 and the sensor 16 too produce.
  • the input voltage for the switching regulator 36 is supplied by the voltage source 34, the value of the Output voltage of this voltage source 34 with the help of the transducer circuit 20 output signal 22 can be controlled.
  • the use of the switching regulator 36 in connection with the controllable voltage source 34 makes it possible to always provide the measuring transducer circuit 20 and the sensor 16 with the highest possible power.
  • the switching regulator 36 ensures that, despite an increase in its input voltage, the operating voltage of the transducer circuit 20 and the sensor 16 is kept at a constant value, so that a higher input power is available by increasing the input voltage on the switching regulator 36, which therefore also has a enables higher output power.
  • the signal current I S also assumes the lower value of the signal current range, i.e.
  • the output voltage of the voltage source 34 can be increased by the control signal from the transducer circuit 20, so that the power available at the input of the switching regulator 36 is also increased. This increased power is then also available for the operation of the transducer circuit 20 and the sensor 16.
  • the control voltage from the transducer circuit 20 is used to reduce the input voltage generated by the voltage source 34 at the input of the switching regulator 36, because in this case because of the high Signal current I S sufficient power for the operation of the transducer circuit 20 and the sensor 16 is available.
  • the limits within which the voltage set by the voltage source 34 can be changed depending on the measured value recorded in each case depends on several factors, such as the output voltage of the supply voltage source 18, the load formed in the measuring resistor 28 and the resistor 30 in the receiver point 12 and on the minimum Terminal voltage U K from which must be present at the encoder point 10 for its proper operation.
  • FIG. 2 shows a diagram which shows how the voltage U e generated by the voltage source 34 and the signal current I S change depending on the measured value M.
  • the measured value M is shown standardized; its smallest value has the standardized value 0 and its largest value has the standardized value 1.
  • the signal current I S has the value 4 mA for the minimum measured value and 20 mA for the maximum measured value.
  • the input voltage U e changes from 12 V at the minimum measured value to 10 V at the maximum measured value.
  • FIG. 3 shows a further embodiment of the arrangement to be described here.
  • the voltage source 34 is not controlled by an output signal from the transducer circuit 20, but rather directly by the terminal voltage U k at the transmitter point.
  • This terminal voltage can be used for this purpose, since it is also clearly related to the measured value detected by the sensor 16, which leads to the setting of the signal current I S.
  • the signal current I S which also flows in the receiver station 12, in turn determines the terminal voltage Uk due to the voltage drops in the receiver station.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Description

Die Erfindung bezieht sich auf eine Anordnung zur Signalübertragung zwischen einer Geberstelle und einer Empfangsstelle, die miteinander durch eine Zweidrahtleitung verbunden sind, über die ein zwischen zwei Grenzwerten veränderlicher analoger Signalstrom übertragen wird, der einen in der Geberstelle von einem Sensor erfaßten Meßwert repräsentiert und den für den Betrieb der Geberstelle erforderlichen Versorgungsstrom bildet, wobei die Geberstelle eine Schaltung aufweist, die eine konstante Betriebsspannung für die Geberstelle erzeugt, und wobei in der Geberstelle eine steuerbare Stromquelle vorgesehen ist, die den über die Zweidrahtleitung fließenden Strom in Abhängigkeit von dem Meßwert bestimmt. The invention relates to an arrangement for signal transmission between a donor station and a receiving station, which are interconnected by a two-wire line are, via which a variable between two limit values analog signal current is transmitted, which one in represents the measured value detected by a sensor and that required for the operation of the donor agency Supply current forms, with the encoder unit a circuit has a constant operating voltage for the Generated donor station, and one in the donor station controllable power source is provided, which over the Two-wire current flowing depending on the Measured value determined.

Eine Anordnung dieser Art ist aus der EP-A-0 744 724 bekannt. Bei dieser bekannten Anordnung sind keine Maßnahmen getroffen, die es ermöglichen könnten, die in der Geberstelle dem Sensor und dessen Meßwandlerschaltung zur Verfügung gestellte Leistung zu optimieren. Die Betriebsspannung der Geberstelle wird vielmehr stets auf einem konstanten Wert gehalten, so daß abhängig von dem gerade fließenden Signalstrom mehr oder weniger Leistung für die interne Versorgung in der Geberstelle zur Verfügung steht.An arrangement of this type is known from EP-A-0 744 724. In this known arrangement there are no measures taken that could enable those in the donor agency the sensor and its transducer circuit for To optimize the performance provided. The operating voltage rather, the donor office is always on one held constant so that depending on the straight flowing signal current more or less power for that internal supply is available in the donor station.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Anordnung der eingangs angegebenen Art so auszugestalten, daß die in der Geberstelle verfügbare Leistung optimiert wird.The invention is therefore based on the object To design the arrangement of the type specified at the beginning, that the power available in the encoder is optimized becomes.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß die die Betriebsspannung für die Geberstelle erzeugende Schaltung ein Schaltregler ist, und daß in der Geberstelle eine Spannungsquelle vorgesehen ist, deren Ausgangsspannung sich entgegengesetzt zum Signalstrom ändert und die die Eingangsspannung des Abwärts-Schaltreglers bildet.This object is achieved according to the invention in that the one that generates the operating voltage for the encoder Circuit is a switching regulator, and that in the encoder position a voltage source is provided, the output voltage changes opposite to the signal current and which the Input voltage of the step-down switching regulator forms.

Der in der erfindungsgemäßen Anordnung verwendete Schaltregler hat die Eigenschaft, daß er die an ihn angelegte Eingangsspannung in eine konstante Ausgangsspannung umsetzt, wobei, abgesehen von internen Verlusten, seine Ausgangsleistung gleich seiner eingangsseitig vorhandenen Leistung ist. Die verfügbare Eingangsleistung kann dadurch erhöht werden, daß seine Eingangsspannung durch Verändern der Ausgangsspannung der Spannungsquelle entgegengesetzt zum Meßwert verändert wird. Bei Vorhandensein eines niedrigen Meßwerts, der demgemäß auch einen niedrigen Signalstrom ergibt, wird daher die Eingangsspannung des Schaltreglers erhöht, während sie bei einem großen Meßwert, der demgemäß auch einen großen Signalstrom ergibt, verringert wird.The switching regulator used in the arrangement according to the invention has the property that he applies the to him Converts input voltage into a constant output voltage, where, apart from internal losses, its output power equal to its performance on the input side is. This can increase the available input power be that its input voltage by changing the Output voltage of the voltage source opposite to Measured value is changed. In the presence of a low Measured value, which accordingly also a low signal current is the input voltage of the switching regulator increased while at a large reading, accordingly also results in a large signal current is reduced.

Aus der DE-C-39 34 007 ist zwar die Verwendung eines Schaltreglers zur Erzeugung der Versorgungsspannung für eine Meßwandlerschaltung und einen Sensor bekannt, jedoch ist es bei dieser bekannten Anordnung nicht möglich, die Eingangsspannung des Schaltreglers zur Beeinflussung der verfügbaren Leistung zu beeinflussen.From DE-C-39 34 007 is the use of a switching regulator to generate the supply voltage for a Transducer circuit and a sensor known, but it is with this known arrangement, the input voltage is not possible of the switching regulator to influence the available ones Affect performance.

Vorteilhafte Weiterbildungen und Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous further developments and refinements of the invention are marked in the subclaims.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der Beschreibung von Ausführungsbeispielen anhand der Zeichnung. In der Zeichnung zeigen:

Figur 1
eine schematische Darstellung einer Anordnung zur Signalübertragung zwischen einer Geberstelle und einer Empfangsstelle gemäß einem ersten Ausführungsbeispiel,
Figur 2
ein Diagramm zur Erläuterung des Zusammenhangs zwischen dem Meßwert, dem Signalstrom und der Eingangsspannung des Schaltreglers und
Figur 3
eine schematische Darstellung einer Anordnung zur Signalübertragung zwischen einer Geberstelle und einer Empfangsstelle gemäß einem zweiten Ausführungsbeispiel.
Further features and advantages of the invention result from the description of exemplary embodiments with reference to the drawing. The drawing shows:
Figure 1
1 shows a schematic representation of an arrangement for signal transmission between a transmitter location and a reception location according to a first exemplary embodiment,
Figure 2
a diagram for explaining the relationship between the measured value, the signal current and the input voltage of the switching regulator and
Figure 3
is a schematic representation of an arrangement for signal transmission between a transmitter and a receiver according to a second embodiment.

In der Zeichnung zeigt Figur 1 schematisch eine Geberstelle 10, die mit einer Empfangsstelle 12 über eine Zweidrahtleitung 14 verbunden ist. Die Geberstelle 10 ist bei dem dargestellten Beispiel eine Meßstelle, in der mit Hilfe eines Sensors 16 ein Meßwert (beispielsweise Temperatur, Druck, Feuchtigkeit, Füllstand, Durchfluß) erfaßt wird. Die Geberstelle 10 enthält keine eigene Energiequelle, sondern bezieht den für ihren Betrieb erforderlichen Versorgungsstrom über die Zweidrahtleitung 14 von einer in der Empfangsstelle 12 enthaltenen Spannungsquelle 18. Über die gleiche Zweidrahtleitung 14 wird ein jeweils den gerade gemessenen Meßwert darstellendes Meßwertsignal von der Geberstelle 10 zur Empfangsstelle 14 übertragen. Einer üblichen Technik entsprechend ist das Meßwertsignal ein über die Zweidrahtleitung 14 fließender Signalstrom IS, der sich zwischen zwei vorgegebenen Werten (üblicherweise den Stromwerten 4 mA und 20 mA) ändern kann. Die Spannungsquelle 18 liefert eine Gleichspannung, und der Meßstrom IS ist ein Gleichstrom.In the drawing, FIG. 1 shows schematically a transmitter point 10, which is connected to a receiving point 12 via a two-wire line 14. In the example shown, the transmitter point 10 is a measuring point in which a measured value (for example temperature, pressure, humidity, fill level, flow) is detected with the aid of a sensor 16. The encoder point 10 does not contain its own energy source, but obtains the supply current required for its operation via the two-wire line 14 from a voltage source 18 contained in the receiving point 12. Via the same two-wire line 14, a measured value signal representing the measured value just measured is sent from the encoder point 10 to the receiving point 14 transferred. In accordance with a conventional technique, the measured value signal is a signal current I S flowing over the two-wire line 14, which can change between two predetermined values (usually the current values 4 mA and 20 mA). The voltage source 18 supplies a direct voltage, and the measuring current I S is a direct current.

Zur Meßwerterfassung enthält die Geberstelle 10 den bereits erwähnten Sensor 16 und eine mit ihm verbundene Meßwandlerschaltung 20, die an Ausgängen 22 und 24 zwei den jeweils erfaßten Meßwert repräsentierende Signale abgibt. Der Zweck dieser beiden Signale wird anschließend noch erläutert.The transmitter 10 already contains the data acquisition mentioned sensor 16 and a transducer circuit connected to it 20, the outputs 22 and 24 two each outputs detected measured value signals. The purpose these two signals will be explained later.

Die Empfangsstelle 12 enthält eine Auswertungsschaltung 26, die aus dem über die Zweidrahtleitung 14 übertragenen Signalstrom IS die Meßwertinformation gewinnt. Zu diesem Zweck ist in die Zweidrahtleitung ein Meßwiderstand 28 eingefügt, an dem eine Spannung UM entsteht, die dem über die Zweidrahtleitung übertragenen Signalstrom IS proportional ist und die der Auswertungsschaltung 26 zugeführt wird. In dem schematischen Schaltbild von Figur 1 ist in der Empfangsstelle 12 ferner ein Widerstand 30 gezeigt, der neben dem Widerstand 28 die Last repräsentiert, die empfängerseitig an der Zweidrahtleitung 14 liegt.The receiving point 12 contains an evaluation circuit 26 which obtains the measured value information from the signal current I S transmitted via the two-wire line 14. For this purpose, a measuring resistor 28 is inserted into the two-wire line, at which a voltage U M is generated which is proportional to the signal current I S transmitted via the two-wire line and which is fed to the evaluation circuit 26. In the schematic circuit diagram of FIG. 1, a resistor 30 is also shown in the receiving point 12, which, in addition to the resistor 28, represents the load which is on the receiver side on the two-wire line 14.

Der Signalstrom IS wird in der Geberstelle 10 durch eine steuerbare Stromquelle 32 eingestellt, der das von der Meßwandlerschaltung 20 am Ausgang 24 abgegebene Signal als Steuersignal für den festzulegenden Signalstrom IS zugeführt wird. Abhängig vom jeweils erfaßten Meßwert wird somit der in der Zweidrahtleitung fließende Signalstrom IS durch eine entsprechende Steuerung der Stromquelle 32 bestimmt.The signal current I S is set in the transmitter point 10 by a controllable current source 32, to which the signal emitted by the transducer circuit 20 at the output 24 is fed as a control signal for the signal current I S to be determined. Depending on the measured value recorded in each case, the signal current I S flowing in the two-wire line is thus determined by a corresponding control of the current source 32.

Wie aus Figur 1 ferner hervorgeht, enthält die Geberstelle 10 eine steuerbare Spannungsquelle 34 und einen Schaltregler 36, dessen Aufgabe darin besteht, eine konstante Betriebsspannung für die Meßwandlerschaltung 20 und den Sensor 16 zu erzeugen. Die Eingangsspannung für den Schaltregler 36 wird von der Spannungsquelle 34 geliefert, wobei der Wert der Ausgangsspannung dieser Spannungsquelle 34 mit Hilfe des von der Meßwandlerschaltung 20 am Ausgang 22 abgegebenen Signals gesteuert werden kann.As can also be seen from FIG. 1, the donor station contains 10 a controllable voltage source 34 and a switching regulator 36, whose task is to maintain a constant operating voltage for the transducer circuit 20 and the sensor 16 too produce. The input voltage for the switching regulator 36 is supplied by the voltage source 34, the value of the Output voltage of this voltage source 34 with the help of the transducer circuit 20 output signal 22 can be controlled.

Die Verwendung des Schaltreglers 36 in Verbindung mit der steuerbaren Spannungsquelle 34 ermöglicht es, der Meßwandlerschaltung 20 und dem Sensor 16 stets die höchstmögliche Leistung zur Verfügung zu stellen. Der Schaltregler 36 sorgt dabei dafür, daß trotz einer Erhöhung seiner Eingangsspannung die Betriebsspannung der Meßwandlerschaltung 20 und des Sensors 16 auf einem konstanten Wert gehalten wird, so daß durch eine Erhöhung der Eingangsspannung am Schaltregler 36 eine höhere Eingangsleistung zur Verfügung steht, die somit auch eine höhere Ausgangsleistung ermöglicht. Bei einem vom Sensor 16 erfaßten Meßwert, der am unteren Ende des Meßwertbereichs liegt, nimmt der Signalstrom IS ebenfalls den unteren Wert des Signalstrombereichs an, im oben angegebenen Beispiel also den Wert von 4 mA, so daß auch die Eingangsleistung am Schaltregler 36 einen niedrigen Wert annehmen würde, da sie durch das Produkt aus Signalstrom und Eingangsspannung gebildet wird. Durch das Steuersignal aus der Meßwandlerschaltung 20 kann die Ausgangsspannung der Spannungsquelle 34 für diesen Fall erhöht werden, so daß die am Eingang des Schaltreglers 36 verfügbare Leistung ebenfalls erhöht wird. Diese erhöhte Leistung steht dann auch für den Betrieb der Meßwandlerschaltung 20 und des Sensors 16 zur Verfügung.The use of the switching regulator 36 in connection with the controllable voltage source 34 makes it possible to always provide the measuring transducer circuit 20 and the sensor 16 with the highest possible power. The switching regulator 36 ensures that, despite an increase in its input voltage, the operating voltage of the transducer circuit 20 and the sensor 16 is kept at a constant value, so that a higher input power is available by increasing the input voltage on the switching regulator 36, which therefore also has a enables higher output power. In the case of a measured value detected by the sensor 16, which lies at the lower end of the measured value range, the signal current I S also assumes the lower value of the signal current range, i.e. in the example given above the value of 4 mA, so that the input power at the switching regulator 36 also has a low value Value would assume, since it is formed by the product of signal current and input voltage. For this case, the output voltage of the voltage source 34 can be increased by the control signal from the transducer circuit 20, so that the power available at the input of the switching regulator 36 is also increased. This increased power is then also available for the operation of the transducer circuit 20 and the sensor 16.

Wenn der vom Sensor 16 erfaßte Meßwert einen hohen Wert hat, der zu einem hohen Signalstrom IS führt, wird mittels des Steuersignals aus der Meßwandlerschaltung 20 die von der Spannungsquelle 34 am Eingang des Schaltreglers 36 erzeugte Eingangsspannung herabgesetzt, da in diesem Fall wegen des hohen Signalstroms IS genügend Leistung für den Betrieb der Meßwandlerschaltung 20 und des Sensors 16 zur Verfügung steht. If the measured value detected by the sensor 16 has a high value, which leads to a high signal current I S , the control voltage from the transducer circuit 20 is used to reduce the input voltage generated by the voltage source 34 at the input of the switching regulator 36, because in this case because of the high Signal current I S sufficient power for the operation of the transducer circuit 20 and the sensor 16 is available.

In welchen Grenzen die von der Spannungsquelle 34 eingestellte Spannung abhängig vom jeweils erfaßten Meßwert verändert werden kann, hängt von mehreren Faktoren, wie der Ausgangsspannung der Versorgungsspannungsquelle 18, der aus dem Meßwiderstand 28 und im Widerstand 30 gebildeten Last in der Empfängerstelle 12 und von der minimalen Klemmenspannung UK ab, die an der Geberstelle 10 für deren einwandfreiem Betrieb vorhanden sein muß.The limits within which the voltage set by the voltage source 34 can be changed depending on the measured value recorded in each case depends on several factors, such as the output voltage of the supply voltage source 18, the load formed in the measuring resistor 28 and the resistor 30 in the receiver point 12 and on the minimum Terminal voltage U K from which must be present at the encoder point 10 for its proper operation.

In Figur 2 ist ein Diagramm dargestellt, aus dem hervorgeht, wie sich die von der Spannungsquelle 34 erzeugte Spannung Ue und der Signalstrom IS in Abhängigkeit vom Meßwert M ändert. Der Meßwert M ist dabei normiert dargestellt; sein kleinster Wert hat den normierten Wert 0 und sein größter Wert hat den normierten Wert 1. Bei der oben erwähnten Zweidrahttechnik hat der Signalstrom IS beim minimalen Meßwert den Wert 4 mA und beim maximalen Meßwert den Wert 20 mA. Im angegebenen Beispiel ändert sich dabei die Eingangsspannung Ue von 12 V beim minimalen Meßwert auf 10 V beim maximalen Meßwert. Diese Werte sind hier nur als Beispiel angegeben; je nach Anwendungsfall können sie auch davon abweichen.FIG. 2 shows a diagram which shows how the voltage U e generated by the voltage source 34 and the signal current I S change depending on the measured value M. The measured value M is shown standardized; its smallest value has the standardized value 0 and its largest value has the standardized value 1. In the two-wire technique mentioned above, the signal current I S has the value 4 mA for the minimum measured value and 20 mA for the maximum measured value. In the example given, the input voltage U e changes from 12 V at the minimum measured value to 10 V at the maximum measured value. These values are given here only as an example; depending on the application, they can also differ.

In Figur 3 ist eine weitere Ausführungsform der hier zu beschreibenden Anordnung dargestellt. Im Gegensatz zum Ausführungsbeispiel von Figur 1 wird in diesem Fall die Spannungsquelle 34 nicht durch ein Ausgangssignal der Meßwandlerschaltung 20, sondern direkt durch die Klemmenspannung Uk an der Geberstelle gesteuert. Diese Klemmenspannung kann zu diesem Zweck verwendet werden, da sie ebenfalls eindeutig mit dem vom Sensor 16 erfaßten Meßwert in Beziehung steht, der zur Einstellung des Signalstroms IS führt. Der Signalstrom IS, der auch in der Empfängerstelle 12 fließt, bestimmt wiederum die Klemmenspannung Uk aufgrund der Spannungsabfälle in der Empfängerstelle.FIG. 3 shows a further embodiment of the arrangement to be described here. In contrast to the exemplary embodiment of FIG. 1, in this case the voltage source 34 is not controlled by an output signal from the transducer circuit 20, but rather directly by the terminal voltage U k at the transmitter point. This terminal voltage can be used for this purpose, since it is also clearly related to the measured value detected by the sensor 16, which leads to the setting of the signal current I S. The signal current I S , which also flows in the receiver station 12, in turn determines the terminal voltage Uk due to the voltage drops in the receiver station.

Die obigen Ausführungen zeigen, daß mit Hilfe der beschriebenen Anordnung eine Optimierung der der Meßwandlerschaltung 20 und dem Sensor 16 zur Verfügung gestellten Leistung ermöglicht wird. Eine Anwendung dieses Prinzips ist nicht auf die Verwendung bei bestimmten Meßwandlerschaltungen und Sensoren beschränkt. Beispielsweise kann sie ohne weiteres bei Mikrowellen-Füllstandsmeßgeräten eingesetzt werden, die nach dem Pulsradar-Verfahren oder dem Frequenzmodulations-Dauer-Radarverfahren arbeiten.The above statements show that with the help of the described Arrangement an optimization of the transducer circuit 20 and the sensor 16 provided power is made possible. This principle is not applied for use with certain transducer circuits and Sensors limited. For example, it can easily be used in microwave level meters, the according to the pulse radar method or the frequency modulation continuous radar method work.

Claims (3)

  1. An assembly for signal transfer between a transmitter location (10) and a receiver location (12) connected to each other by a two-wire line (14) via which an analogue signal current (IS), variable between two limit values, is transferred which represents a measured variable sensed by a sensor (16) in the transmitter location (10) and forms the supply current necessary for operating the transmitter location (10), the transmitter location (10) comprising a circuit (36) generating a constant operating voltage for the transmitter location (10), and a controllable current source (32) being provided in the transmitter location (10), the current source (32) determining the current flowing via the two-wire line (14) as a function of the measured variable, characterized in that the circuit (36) generating the operating voltage for the transmitter location (10) is a switching regulator and that in the transmitter location (10) a voltage source (34) is provided, the output voltage of which changes in the opposite sense of the signal current and forms the input voltage of the step-down switching regulator (36).
  2. The assembly as set forth in claim 1, characterized in that the voltage source (34) is controlled by a control signal generated by a transducer circuit (20) processing the signal representing the measured variable and output by the sensor (16).
  3. The assembly as set forth in claim 1, characterized in that the voltage source (34) is controlled by a control signal corresponding to the voltage (UK) across the two-wire line (14) and tapped from the input terminals of the transmitter location (10).
EP98109740A 1997-06-05 1998-05-28 Device for transmitting signals between a transmitter and a receiver Revoked EP0883097B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19723645A DE19723645B4 (en) 1997-06-05 1997-06-05 Arrangement for signal transmission between a donor site and a receiving site
DE19723645 1997-06-05

Publications (3)

Publication Number Publication Date
EP0883097A2 EP0883097A2 (en) 1998-12-09
EP0883097A3 EP0883097A3 (en) 1999-02-17
EP0883097B1 true EP0883097B1 (en) 2003-03-19

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EP98109740A Revoked EP0883097B1 (en) 1997-06-05 1998-05-28 Device for transmitting signals between a transmitter and a receiver

Country Status (4)

Country Link
US (1) US6140940A (en)
EP (1) EP0883097B1 (en)
JP (1) JP2960717B2 (en)
DE (2) DE19723645B4 (en)

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Also Published As

Publication number Publication date
EP0883097A2 (en) 1998-12-09
EP0883097A3 (en) 1999-02-17
DE59807514D1 (en) 2003-04-24
JPH1116082A (en) 1999-01-22
DE19723645A1 (en) 1998-12-10
JP2960717B2 (en) 1999-10-12
DE19723645B4 (en) 2006-04-13
US6140940A (en) 2000-10-31

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