EP0658866A1 - Device for galvanically isolated transmission of direct and alternating current signals - Google Patents

Device for galvanically isolated transmission of direct and alternating current signals Download PDF

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Publication number
EP0658866A1
EP0658866A1 EP94250295A EP94250295A EP0658866A1 EP 0658866 A1 EP0658866 A1 EP 0658866A1 EP 94250295 A EP94250295 A EP 94250295A EP 94250295 A EP94250295 A EP 94250295A EP 0658866 A1 EP0658866 A1 EP 0658866A1
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EP
European Patent Office
Prior art keywords
transmission
rectifier
transformer
inverter
terminals
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Granted
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EP94250295A
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German (de)
French (fr)
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EP0658866B1 (en
Inventor
Günter von zur Gathen
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ABB Training Center GmbH and Co KG
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Hartmann and Braun AG
Mannesmann AG
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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 the isolated transmission of direct and alternating current signals via two-wire lines.
  • each measured value is converted into a proportional direct current, which is superimposed on the direct feed current, wherein the direct current representing the measured value can be a multiple of the direct feed current.
  • the supply current requirement of the field device is usually set to approximately 4 mA and the dynamic range of the measured value is mapped to currents between 0 and 16 mA, so that the known 0/4 ... 20 mA current loop can be used.
  • the circuits are for the Measured value acquisition and measured value processing are carried out galvanically separated from each other.
  • a combination of an inverter, a coupling stage with galvanic isolation and a rectifier is used for the galvanically isolated direct current transmission.
  • combinations consisting of a voltage-frequency converter, an optocoupler and a frequency-voltage converter connected downstream are also used.
  • Newer field devices are also characterized by universal properties that are largely adaptable to the respective process.
  • a bidirectionally operable alternating current transmission path is provided, via which parameterization data are transmitted in the direction of the field device and measured values and status data are transmitted from the direction of the field device.
  • the parameterization data and the measured values as well as the status data are modulated onto an AC voltage, preferably frequency-modulated.
  • the alternating current transmission path is conducted via a separate two-wire line and provided with separate means for electrical isolation.
  • the former advantage of being able to carry out the entire communication and supply of each field device via a single two-wire line is lost.
  • the invention is therefore based on the object of specifying an arrangement which makes it possible to transmit DC signals unidirectionally and AC current signals bidirectionally in a potential-separated manner while maintaining the 0/4 ... 20 mA interface, via a common two-wire line.
  • this object is achieved by a transmission quadrupole with a first and a second pair of terminals for connection to an incoming and an outgoing two-wire line, which, based on a known combination of means, for unidirectional, galvanically isolated transmission of direct current signals, a separate transmitter for the bidirectional transmission of alternating current signals having.
  • the windings of the second transformer are looped into one of the current paths for the incoming and outgoing two-wire line.
  • the middle combination for the unidirectional, galvanically isolated transmission of direct current signals consists of an inverter, a coupling stage and a rectifier.
  • an inverter is to be understood as any device which is suitable for converting an incoming direct current into an alternating electrical quantity, regardless of whether the amplitude, the frequency or the phase of this alternating variable is proportional to the incoming direct current.
  • a rectifier in the context of this invention is to be understood as any device which is suitable for generating a proportional direct current from the amplitude, the frequency or the phase of an alternating electrical quantity.
  • the transmission medium of the coupling stage can be inductive, capacitive or optical.
  • the winding connections of the same name of the transformer are connected to terminals of the same name for the incoming and outgoing two-wire line.
  • each pair of terminals has one Plus terminal and a minus terminal.
  • the winding connections of the same name are the beginning and end of each winding, based on the winding direction.
  • Incoming and outgoing two-wire lines are related to the information flow of the unidirectional DC signal. This means that the incoming two-wire line is connected to the inverter and the outgoing two-wire line to the rectifier.
  • the ohmic component of each winding of the transformer acts in the form of a voltage increase at the connection terminals, without impairing the signal flow.
  • the alternating current signal is superimposed on the direct current.
  • the AC signal is switched to the two-wire line with low resistance via internal or external capacitive bridges.
  • the direct components of the magnetic fluxes in the windings of the transformer compensate for a DC ratio of 1: 1 from the incoming to the outgoing DC signal, so that a core of comparatively small volume is already sufficient for the transmitter for the saturation-free transmission of the AC signal.
  • a transmission quadrupole 10 which has a chain circuit consisting of an inverter 11, a coupling stage 12 with electrical isolation and a rectifier 13 and is provided with a first pair of terminals 111 and 112 and a second pair of terminals 131 and 132.
  • the inverter 11 optionally has means for signal amplification.
  • capacitive switching elements are provided in the inverter 11, which cause a short circuit of the inverter in terms of AC voltage.
  • the transmission quadrupole 10 also has a connection 110 for supplying power to the inverter 11.
  • the rectifier 13 can be designed as an active or passive rectifier. If the rectifier 13 is of the active type, the transmission quadrupole 10 has a connection 130 for supplying power to the rectifier 13. The rectifier 13 is provided with capacitive switching means which short-circuit AC influences on the output side.
  • the transmission quadrupole 10 also has a transformer 14 with a first winding 141 and a second winding 142.
  • the inductance of the first winding 141 is in series with the inverter 11 upstream, and the inductance of the second winding 142 is connected in series to the rectifier 13.
  • the series connection of the first winding 141 of the transformer 14 and the inverter 11 is connected to the first pair of terminals 111 and 112.
  • the series circuit consisting of the inductance of the second winding 142 of the transformer 14 and the rectifier 13 is connected to the second pair of terminals 131 and 132 of the transmission quadrupole 10.
  • terminal 111 is the positive terminal and terminal 112 is the negative terminal of the incoming direct current transmission path
  • terminal 131 is the positive terminal and terminal 132 is the negative terminal of the outgoing direct current transmission path.
  • the windings 141 and 142 of the transformer 14 are connected in the current paths of the direct current transmission path in such a way that winding connections of the same name are connected to terminals of the same name.
  • the winding starts are shown in the usual way by an *.
  • the direct current fed in via the connections 111 and 112 is converted in the inverter 11 into an equivalent alternating voltage, which is transmitted to the rectifier 13 via the coupling stage 12 with galvanic isolation.
  • the received alternating current is converted into an equivalent rectifying current in the rectifier 13 and output via the connections 131 and 132. That via the connections 111 and 112 coming AC signal is switched via them capacitive switching elements in the inverter 11 to the first winding 141 of the transformer 14 and transmitted with this potential-free to the second winding 142 of the transformer 14.
  • the AC signal is transmitted from the second winding 142 to the connecting terminals 131 and 132 via the capacitive switching element in the rectifier 13.
  • the alternating current transmission in the opposite direction takes place in an analogous manner.
  • FIG. 2 shows an isolating amplifier which consists of a transmission quadrupole 10 and a power supply device 50.
  • the power supply device 50 is supplied with external auxiliary energy 60 and has supply circuits, which are galvanically isolated from it and below, for connection to the power supply of the inverter 110 and the power supply of the rectifier 130.
  • an incoming two-wire line 30 is connected to the connections 111 and 112 and an outgoing two-wire line 40 to the connections 131 and 132.
  • FIG. 3 which consists of a transmission quadrupole 10 and a converter 20.
  • the converter 20 is used to feed the inverter 11 of the transmission quadrupole 10.
  • the rectifier 13 of the transmission quadrupole 10 is designed as a passive rectifier.
  • the converter 20 is connected on the input side to the upcoming two-wire line 30 and is fed from the incoming DC signal.
  • FIG. 4 a feed separator is shown in which the molds 20 are supplied with external auxiliary energy 60.
  • a transmitter supply device equipped with a transmission quadrupole 10 is shown in FIG.
  • a power supply device 50 is fed in the external auxiliary energy 60 and has circuits, which are galvanically isolated from each other, for connection to the power supply terminal of the rectifier 130 and the power supply terminal of the inverter 110.
  • a transducer 80 which is the source of the DC signal.
  • the transducer 80 is connected to a two-wire line 30, which is connected to the negative terminal 112 of the transmission four-pin 10 with one pole and to the supply circuit for the inverter of the power supply device 50 with one pole.
  • the positive terminal 111 is connected to the connection for the power supply 110 of the inverter 11.
  • the AC signal is transmitted between the transducer 80 and the transmission quadrupole 10 via capacitive switching means in the supply circuit of the power supply device 50 for the inverter 13.
  • capacitive switching means also serve as smoothing and filtering capacitors when the DC supply voltage is provided for the inverter 13.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Inverter Devices (AREA)
  • Burglar Alarm Systems (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Power Conversion In General (AREA)

Abstract

The invention relates to an arrangement for galvanically isolated transmission of DC and AC signals via two-wire lines, having a combination comprising an invertor, a coupling stage with galvanic isolation and a rectifier for unidirectional DC transmission and a transformer for unidirectional DC transmission and a transformer for AC transmission, the invertor being connected to a first pair of connecting terminals and the rectifier to a second pair of connecting terminals. In order to transmit DC signals unidirectionally and AC signals bidirectionally in a galvanically isolated manner via a joint two-wire line while maintaining a 0/4 ...20mA interface, it is proposed according to the invention, that a first series inductance (141) is connected upstream of the invertor (11), that a second series inductance (142) is connected downstream of the rectifier (13), and that the first and the second series inductances (141, 142) are windings of the transformer (14) for AC transmission. <IMAGE>

Description

Die Erfindung betrifft eine Anordnung zur potentialgetrennten übertragung von Gleich- und Wechselstromsignalen über Zweidrantleitungen.The invention relates to an arrangement for the isolated transmission of direct and alternating current signals via two-wire lines.

In der Meß-, Steuerungs- und Regelungstechnik ist es seit längerem üblich, über eine Zweidrahtleitung ein Feldgerät zu speisen und Meßwerte von diesem Feldgerät zu einem Anzeigegerat und/oder zu einer regelungstechnischen Anlage zu übertragen. Dabei wird jeder Meßwert in eine proportionalen Gleichstrom umgeformt, der dem Speisegleichstrom überlagert wird, wobei der den Meßwert repräsentierende Gleichstrom ein Vielfaches des Speisegleichstromes sein kann. So ist üblicherweise der Speisestrombedarf des Feldgerates auf ca. 4 mA eingestellt und der Dynamikumfang des Meßwertes auf Ströme zwischen 0 und 16 mA abgebildet, so daß die bekannte 0/4...20 mA-Stromschleife verwendbar ist.In measurement, control and regulation technology, it has long been customary to feed a field device via a two-wire line and to transmit measured values from this field device to a display device and / or to a control system. Each measured value is converted into a proportional direct current, which is superimposed on the direct feed current, wherein the direct current representing the measured value can be a multiple of the direct feed current. The supply current requirement of the field device is usually set to approximately 4 mA and the dynamic range of the measured value is mapped to currents between 0 and 16 mA, so that the known 0/4 ... 20 mA current loop can be used.

Zur vermeidung von Meßertveriälschungen infolge Potentialverschleppung und aus sicherheitstechnischen Gründen sind die Stromkreise für die Meßwerterfassung und die Meßwertverarbeitung galvanisch voneinander getrennt ausgeführt.To avoid distortion of the knife due to potential carryover and for safety reasons, the circuits are for the Measured value acquisition and measured value processing are carried out galvanically separated from each other.

Zur galvanisch getrennten Gleichstromübertragung bedient man sich bei einem derartigen Dynamikumfang einer Kombination aus einem Wechselrichter, einer Koppelstufe mit galvanischer Trennung und einem Gleichrichter. Alternativ werden auch kombinationen, bestehend aus einem Spannungs-Frequenz-Umsetzer, einem Optokoppler und einem diesem nachgeschalteten Frequenz-Spannungs-Umsetzer eingesetzt.For such a dynamic range, a combination of an inverter, a coupling stage with galvanic isolation and a rectifier is used for the galvanically isolated direct current transmission. Alternatively, combinations consisting of a voltage-frequency converter, an optocoupler and a frequency-voltage converter connected downstream are also used.

Neuere Feldgerate zeichnen sich darüber hinaus durch universelle, weitgehend an den jeweiligen Prozeß adaptierbare Eigenschaften aus. Dazu ist parallel zum unidirektionalen Gleichstromübertragungsweg ein bidirektional betreibbarer Wechselstromübertragungsweg vorgesehen, über den in Richtung zum Feldgerät Parametrierdaten und aus Richtung des Feldgerätes Meßwerte und Zustandsdaten übertragen werden. Die Parametrierdaten und die Meßwerte sowie die Zustandsdaten sind auf eine Wechselspannung moduliert, vorzugsweise frequenzmoduliert.Newer field devices are also characterized by universal properties that are largely adaptable to the respective process. For this purpose, parallel to the unidirectional direct current transmission path, a bidirectionally operable alternating current transmission path is provided, via which parameterization data are transmitted in the direction of the field device and measured values and status data are transmitted from the direction of the field device. The parameterization data and the measured values as well as the status data are modulated onto an AC voltage, preferably frequency-modulated.

Der Wechsetstromübertragungsweg ist über eine separate Zweidrahtleitung geführt und mit separaten Mitteln zur galvanischen Trennung versehen. Der einstige Vorteil, die gesamte Kommunikation und die Speisung jedes Feldgerätes über eine einzige Zweidrahtleitung vornehmen zu können, geht dabei jedoch verloren.The alternating current transmission path is conducted via a separate two-wire line and provided with separate means for electrical isolation. However, the former advantage of being able to carry out the entire communication and supply of each field device via a single two-wire line is lost.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Anordnung anzugeben, die es gestattet, unter Beibehaltung der 0/4...20 mA-Schnittstelle Gleichstromsignale unidirektional und Wechsetstromsignale bidirektional potentialgetrennt über eine gemeinsame Zweidrahtleitung zu übertragen.The invention is therefore based on the object of specifying an arrangement which makes it possible to transmit DC signals unidirectionally and AC current signals bidirectionally in a potential-separated manner while maintaining the 0/4 ... 20 mA interface, via a common two-wire line.

Erfindungsgemaß wird diese Aufgabe durch einen übertragungsvierpol mit einem ersten und einem zweiten Anschlußklemmenpaar zum Anschluß an jeweils eine kommende und eine gehende Zweidrahtleitung gelost, der, ausgehend von einer bekannten Mittelkombination, zur unidirektionalen, galvanisch getrennter übertragung von Gleichstromsignalen einen separaten übertrager zur bidirektionalen übertragung von Wechselstromsignalen aufweist. Dabei sind die Wicklungen des zweiten übertragers jeweils in einen der Strompfade für die kommende und die gehende Zweidrahtleitung eingeschleift.According to the invention, this object is achieved by a transmission quadrupole with a first and a second pair of terminals for connection to an incoming and an outgoing two-wire line, which, based on a known combination of means, for unidirectional, galvanically isolated transmission of direct current signals, a separate transmitter for the bidirectional transmission of alternating current signals having. The windings of the second transformer are looped into one of the current paths for the incoming and outgoing two-wire line.

Die Mittelkombination zur unidirektionalen, galvanisch getrennten übertragung von Gleichstromsignalen besteht dabei aus einem Wechselrichter, einer Koppelstufe und einem Gleichrichter. Unter Wechselrichter ist im Rahmen dieser Erfindung jede Einrichtung zu verstehen, die geeigret ist, einen kommenden Gleichstrom in eine elektrische Wechselgroße umzusetzen, unabhängig davon, ob die Amplitude, die Frequenz oder die Phase dieser Wechselgröße zum kommenden Gleichstrom proportional ist. Demgemäß ist als Gleichrichter im Rahmen dieser Erfindung jede Einrichtung zu verstehen, die geeignet ist, aus der Amplitude, der Frequenz oder der Phase einer elektrischen Wechselgroße einen proportionalen Gleichstrom zu erzeigen. Das übertragungsmedium der Koppelstufe kann induktiver, kapazitiver oder optischer Art sein.The middle combination for the unidirectional, galvanically isolated transmission of direct current signals consists of an inverter, a coupling stage and a rectifier. In the context of this invention, an inverter is to be understood as any device which is suitable for converting an incoming direct current into an alternating electrical quantity, regardless of whether the amplitude, the frequency or the phase of this alternating variable is proportional to the incoming direct current. Accordingly, a rectifier in the context of this invention is to be understood as any device which is suitable for generating a proportional direct current from the amplitude, the frequency or the phase of an alternating electrical quantity. The transmission medium of the coupling stage can be inductive, capacitive or optical.

Vorzugsweise sind gleichnamige Wicklungsanschlüsse des übertragers an gleichnamige Anschlußklemmen für die kommende und die gehende Zweidrahtleitung geschaltet.Preferably, the winding connections of the same name of the transformer are connected to terminals of the same name for the incoming and outgoing two-wire line.

Gleichnamigkeit soll dabei, bezogen auf die Anschlußklemmen, bedeuten, daß, ausgehend von der Gleichstromübertragung, jedes Klemmenpaar eine Plusklemme und eine Minusklemme aufweist. Gleichnamige Wicklungsanschlüsse sind Anfang und Ende einer jeden Wicklung, bezogen auf den Wickelsinn.In relation to the terminals, the same name should mean that, based on the direct current transmission, each pair of terminals has one Plus terminal and a minus terminal. The winding connections of the same name are the beginning and end of each winding, based on the winding direction.

Kommende und gehende Zweidrahtleitungen sind auf den Informationsfluß des unidirektionalen Gleichstromsignals bezogen. Das bedeutet, die kommende Zweidrahtleitung ist mit dem Wechselrichter und die gehende Zweidrahleitung mit dem Gleichrichter verbunden.Incoming and outgoing two-wire lines are related to the information flow of the unidirectional DC signal. This means that the incoming two-wire line is connected to the inverter and the outgoing two-wire line to the rectifier.

Fur die Gleichstromübertragung wirkt von jeder Wicklung des übertragers nur die ohmsche Komponente in Form einer Spannungserhöhung an den Anschlußklemmen, ohne den Signalfluß zu beeinträchtigen. Das Wechselstromsignal wird dem Gleichstrom überlagert. Über innere oder äußere kapazitive Brücken wird das Wechselstromsignal niederohmig auf die Zweidrahtleitung geschaltet.For the direct current transmission, only the ohmic component of each winding of the transformer acts in the form of a voltage increase at the connection terminals, without impairing the signal flow. The alternating current signal is superimposed on the direct current. The AC signal is switched to the two-wire line with low resistance via internal or external capacitive bridges.

In vorteilhafter Ausgestaltung der Erfindung kompensieren die Gleichanteile der magnetischen Flüsse in den Wicklungen des Übertragers bei einem Gleichstromübersetzungsverhaltnis von 1:1 vom kommenden zum gehenden Gleichstromsignal, so daß für den Übertrager bereits ein Kern vergleichsweise geringen volumens zur sättigungsfreien Übertragung des Wechselstromsignals genügt.In an advantageous embodiment of the invention, the direct components of the magnetic fluxes in the windings of the transformer compensate for a DC ratio of 1: 1 from the incoming to the outgoing DC signal, so that a core of comparatively small volume is already sufficient for the transmitter for the saturation-free transmission of the AC signal.

Die Erfindung wird nachstehend abhand von Ausführungsbeispielen näher erläutert. Es zeigen:

Fig. 1
eine Darstellung des Übertragungsvierpols,
Fig. 2
eine Anordnung des Übertragungsvierpols in einem Trennverstärker,
Fig. 3
eine Anordnung des Übertragungsvierpols in einem passiven Trenner,
Fig. 4
eine Anordnung des Übertragungsvierpols in einem Speisetrenner,
Fig. 5
eine Anordnung des Übertragungsvierpols in einem Meßumformerspeisegerät.
The invention is explained in more detail below on the basis of exemplary embodiments. Show it:
Fig. 1
a representation of the transmission quadrupole,
Fig. 2
an arrangement of the transmission quadrupole in a signal conditioner,
Fig. 3
an arrangement of the transmission quadrupole in a passive isolator,
Fig. 4
an arrangement of the transmission quadrupole in a supply isolator,
Fig. 5
an arrangement of the transmission quadrupole in a transmitter power supply.

In Fig. 1 ist ein Übertragungsvierpol 10 dargestellt, den eine Kettenschaltung, bestehend aus einem Wechselrichter 11, einer Koppelstufe 12 mit galvanischer Trennung und einem Gleichrichter 13 aufweist und mit einem ersten Anschlußklemmenpaar 111 und 112 und einem zweiten Anschlußklemmenpaar 131 und 132 versehen ist. Der Wechselrichter 11 weist optional Mittel zur Signalverstärkung auf. Weiterhin sind im Wechselrichter 11 kapazitive Schaltelement vorgesehen, die wechselspannungsmäßig einen Kurzschluß des Wechselrichters bewirken. Der Übertragungsvierpol 10 weist darüber hinaus einen Anschluß 110 zur Stromversorgung des Wechselrichters 11 auf.In Fig. 1, a transmission quadrupole 10 is shown, which has a chain circuit consisting of an inverter 11, a coupling stage 12 with electrical isolation and a rectifier 13 and is provided with a first pair of terminals 111 and 112 and a second pair of terminals 131 and 132. The inverter 11 optionally has means for signal amplification. Furthermore, capacitive switching elements are provided in the inverter 11, which cause a short circuit of the inverter in terms of AC voltage. The transmission quadrupole 10 also has a connection 110 for supplying power to the inverter 11.

Der Gleichrichter 13 kann als aktiver oder passiver Gleichrichter ausgeführt sein. Ist der Gleichrichter 13 vom aktiven Typ, dann weist der Übertragungsvierpol 10 einen Anschluß 130 zur Stromversorgung des Gleichrichters 13 auf. Der Gleichrichter 13 ist mit kapazitiven Schaltmitteln versehen, die ausgangsseitige Wechsetstrombeeinflussungen kurzschließen.The rectifier 13 can be designed as an active or passive rectifier. If the rectifier 13 is of the active type, the transmission quadrupole 10 has a connection 130 for supplying power to the rectifier 13. The rectifier 13 is provided with capacitive switching means which short-circuit AC influences on the output side.

Der Übertragungsvierpol 10 weist darüber hinaus einen Übertrager 14 mit einen ersten Wicklung 141 und einer zweiten Wicklung 142 auf. Die Induktivität der ersten Wicklung 141 ist dem Wechselrichter 11 in Serie vorgeschaltet, und die Induktivität der zweiten Wicklung 142 ist dem Gleichrichter 13 in Serie nachgeschaltet. Die Serienschaltung aus der ersten Wicklung 141 des Übertragers 14 und dem Wechselrichter 11 ist an das erste Anschlußklemmenpaar 111 und 112 angeschlossen. Die Serienschaltung aus der Induktivität der zweiten Wicklung 142 des Übertragers 14 und des Gleichrichters 13 ist an das zweite Anschlußklemmenpaar 131 und 132 des Übertragungsvierpols 10 angeschlossen.The transmission quadrupole 10 also has a transformer 14 with a first winding 141 and a second winding 142. The inductance of the first winding 141 is in series with the inverter 11 upstream, and the inductance of the second winding 142 is connected in series to the rectifier 13. The series connection of the first winding 141 of the transformer 14 and the inverter 11 is connected to the first pair of terminals 111 and 112. The series circuit consisting of the inductance of the second winding 142 of the transformer 14 and the rectifier 13 is connected to the second pair of terminals 131 and 132 of the transmission quadrupole 10.

Im weiteren sei angenommen, daß der Anschluß 111 die Plusklemme und der Anschluß 112 die Minusklemme des kommenden Gleichstromübertragungsweges ist, und weiterhin sei angenommen, daß den Anschluß 131 die Plusklemme und der Anschluß 132 die Minusklemme des gehenden Gleichstromübertragungsweges ist. Die Wicklungen 141 und 142 des Übertragers 14 sind so in die Strompfade des Gleichstromübertragungsweges geschaltet, daß gleichnamige Wicklungsanschlüsse mit gleichnamigen Anschlußklemmen verbunden sind. Fur die in Fig. 1 dargestellte Ausführungsform bedeutet dies, daß das Wicklungsende der ersten Wicklung 141 mit der Minusklemme 112 des kommenden Gleichstromübertragungsweges und das Wicklungsende der zweiten Wicklung 142 mit der Minusklemme des gehenden Gleichstromubertragungsweges 132 verbunden sind. Die Wicklungsanfange sind in üblicher Art und Weise durch ein * dargestellt.It is further assumed that terminal 111 is the positive terminal and terminal 112 is the negative terminal of the incoming direct current transmission path, and it is further assumed that terminal 131 is the positive terminal and terminal 132 is the negative terminal of the outgoing direct current transmission path. The windings 141 and 142 of the transformer 14 are connected in the current paths of the direct current transmission path in such a way that winding connections of the same name are connected to terminals of the same name. For the embodiment shown in FIG. 1, this means that the winding end of the first winding 141 is connected to the negative terminal 112 of the incoming direct current transmission path and the winding end of the second winding 142 is connected to the negative terminal of the outgoing direct current transmission path 132. The winding starts are shown in the usual way by an *.

Der über die Anschlüsse 111 und 112 eingespeiste Gleichstrom wird im Wechselrichter 11 in eine äquivalente Wechselspannung umgesetzt, die über die Koppelstufe 12 mit galvanischer Trennung potentialfrei an den Gleichrichter 13 übertragen wird. Im Gleichrichter 13 wird der empfangene Wechselstrom in einen aquivalenten Gelichstrom umgeformt und über die Anschlüsse 131 und 132 abgegeben. Das über die Anschlüsse 111 und 112 kommende Wechselstromsignal wird über sie kapazitiven Schaltelemente im Wechselrichter 11 auf die erste Wicklung 141 des Übertragers 14 geschaltet und mit diesem potentialfrei auf die zweite Wicklung 142 des Übertragers 14 übertragen. Über die kapazitiven Schaltelement im Gleichrichter 13 wird das Wechselstromsignal von der zweiten Wicklung 142 auf die Anschlußklemmen 131 und 132 übertragen. Die Wechselstromübertragung in entgegenesetzter Richtung erfolgt auf analoge Weise.The direct current fed in via the connections 111 and 112 is converted in the inverter 11 into an equivalent alternating voltage, which is transmitted to the rectifier 13 via the coupling stage 12 with galvanic isolation. The received alternating current is converted into an equivalent rectifying current in the rectifier 13 and output via the connections 131 and 132. That via the connections 111 and 112 coming AC signal is switched via them capacitive switching elements in the inverter 11 to the first winding 141 of the transformer 14 and transmitted with this potential-free to the second winding 142 of the transformer 14. The AC signal is transmitted from the second winding 142 to the connecting terminals 131 and 132 via the capacitive switching element in the rectifier 13. The alternating current transmission in the opposite direction takes place in an analogous manner.

In Fig. 2 ist ein Trennverstarker dargestellt, der aus einem Übertragungsgvierpol 10 und einer Stromversorgungseinrichtung 50 besteht. Die Stromversorgungseinrichtung 50 wird mit externer Hilfsenergie 60 gespeist und weist von dieser und unterienanger galvanisch getrennte Speisestromkreise zum Anschluß an die Stromversorgung des Wechselrichters 110 und die Stromversorgung des Gleichrichters 130 auf. Zur übertragung der Gleich- und Wechselstromsignale sind an die Anschlüsse 111 uns 112 eine kommende Zweidrahtleitung 30 und an die Anschlüsse 131 und 132 eine gehende Zweidrahtleitung 40 angeschlossen.2 shows an isolating amplifier which consists of a transmission quadrupole 10 and a power supply device 50. The power supply device 50 is supplied with external auxiliary energy 60 and has supply circuits, which are galvanically isolated from it and below, for connection to the power supply of the inverter 110 and the power supply of the rectifier 130. For the transmission of the direct and alternating current signals, an incoming two-wire line 30 is connected to the connections 111 and 112 and an outgoing two-wire line 40 to the connections 131 and 132.

In weiterer Ausgestaltung der Erfindung ist in Fig. 3 ein passiver Trennen dargestellt, der aus einem Übertragungsvierpol 10 und einem Umformer 20 besteht. Der Umformer 20 dient zur Speisung des Wechselrichters 11 des Übertragungsvierpols 10. Der Gleichrichter 13 des Übertragungsvierpols 10 ist als passiver Gleichrichter ausgeführt. Der Umformer 20 ist eingangsseitig an die kommende Zweidrantleitung 30 angeschlossen und wird aus dem kommenden Gleichstromsignal gespeist.In a further embodiment of the invention, passive separation is shown in FIG. 3, which consists of a transmission quadrupole 10 and a converter 20. The converter 20 is used to feed the inverter 11 of the transmission quadrupole 10. The rectifier 13 of the transmission quadrupole 10 is designed as a passive rectifier. The converter 20 is connected on the input side to the upcoming two-wire line 30 and is fed from the incoming DC signal.

Unter Verwendung gleicher Mittel und Bezugszeichen ist in Fig. 4 ein Speisetrenner gezeigt, bei dem den Umformen 20 mit externer Hilfsenergie 60 versorgt ist.Using the same means and reference numerals, a feed separator is shown in FIG. 4, in which the molds 20 are supplied with external auxiliary energy 60.

In besonderer Ausgestaltung der Erfindung ist in Fig. 5 ein mit einem Übertragungsvierpol 10 ausgestattetes Meßumformerspeisegerät dargestellt. Eine Stromversorgungseinrichtung 50 wird im externer Hilfsenergie 60 gespeist und weist von dieser uns voneinander galvanisch getrennte Stromkreise zum Anschluß an die Stromversorgungsklemme des Gleichrichters 130 und der Stromversorgungsklemme des Wechselrichters 110 auf. Weiterhin ist ein Meßumformer 80 dargestellt, der Quelle des Gleichstomsignals ist. Der Meßumformer 80 ist an eine Zweidrahtleitung 30 angeschlossen, die einpolig an die Minusklemme 112 des Übertragungsvierpols 10 und einpolig an den Versorgungsstromkreis für den Wechselrichter der Stomversorgungseinrichtung 50 angeschlossen ist. Die Plusklemme 111 ist mit dem Anschluß für die Stromversorgung 110 des Wechselrichters 11 verbunden. In Besonderheit dieser Ausführungsform erfolget die Wechselstromsignalübertragung zwischen dem Meßumformer 80 und dem Übertragungsvierpol 10 über kapazitive Schaltmittel im Speisestromkreis der Stromversorgungseinrichtung 50 für den Wechselrichter 13. Diese kapazitiven Schaltmittel dienen im übrigen als Glättungs- und Siebkondensatoren bei der Bereitstellung der Speisegleichspannung für den Wechselrichter 13.In a special embodiment of the invention, a transmitter supply device equipped with a transmission quadrupole 10 is shown in FIG. A power supply device 50 is fed in the external auxiliary energy 60 and has circuits, which are galvanically isolated from each other, for connection to the power supply terminal of the rectifier 130 and the power supply terminal of the inverter 110. Also shown is a transducer 80 which is the source of the DC signal. The transducer 80 is connected to a two-wire line 30, which is connected to the negative terminal 112 of the transmission four-pin 10 with one pole and to the supply circuit for the inverter of the power supply device 50 with one pole. The positive terminal 111 is connected to the connection for the power supply 110 of the inverter 11. In a special feature of this embodiment, the AC signal is transmitted between the transducer 80 and the transmission quadrupole 10 via capacitive switching means in the supply circuit of the power supply device 50 for the inverter 13. These capacitive switching means also serve as smoothing and filtering capacitors when the DC supply voltage is provided for the inverter 13.

BezugszeichenlisteReference list

1010th
ÜbertragungsvierpolQuadruple transmission
1111
WechselrichterInverter
1212th
Koppelstufe mit galvanischer TrennungCoupling stage with electrical isolation
1313
GleichrichterRectifier
1414
ÜbertragerTransformer
2020th
UmformerConverter
3030th
kommende Zweidrantleitungcoming two-wire line
4040
gehende Zweidrahtleitungoutgoing two-wire line
5050
StromversorgungseinrichtungPower supply facility
6060
HilfsenergieAuxiliary energy
8080
MeßumformerTransmitter
110110
Stromversorgung des WechselrichtersPower supply to the inverter
111111
Anschluß für kommende PlusleitungConnection for incoming positive line
112112
Anschluß für kommende MinusleitungConnection for incoming negative line
130130
Stromversorgung des aktiven GleichrichtersPower supply to the active rectifier
131131
Anschluß für gehende PlusleitungConnection for outgoing positive line
132132
Anschluß für gehende MinusleitungConnection for outgoing negative line
141, 142141, 142
InduktivitätenInductors

Claims (2)

Anordnung zur potentialgetrennten übertragung von Gleich- und Wechselstromsignalen über Zweidrahtleitungen mit einer Kombination, bestehend aus einem Wechselrichter, einer Koppelstufe mit galvanischer Trennung und einem Gleichrichter zur unidirektionalen Gleichstomübertragung und einem Übertrager zur Wechselstromubertragung, wobei der Wechselrichter mit einem ersten Anschlußklemmenpaar und der Gleichrichter mit einem zweiten Anschlußklemmenpaar verbunden ist,
dadurch gekennzeichnet,
daß dem Wechselrichter (11) eine erste Reineninduktivität (141) vorgeschaltet ist,
daß dem Gleichrichter (13) eine zweite Reineninduktivität (142) nachgeschaltet ist,
und daß die erste und die zweite Reiheninduktivität (141, 142) Wicklungen des Übertragers (14) zur Wechselstromübertragung sind.Arrangement for the isolated transmission of direct and alternating current signals via two-wire lines with a combination consisting of an inverter, a coupling stage with electrical isolation and a rectifier for unidirectional direct current transmission and a transformer for alternating current transmission, the inverter with a first pair of terminals and the rectifier with a second Pair of terminals is connected,
characterized,
that a first pure inductance (141) is connected upstream of the inverter (11),
that the rectifier (13) is followed by a second pure inductor (142),
and that the first and second series inductors (141, 142) are windings of the transformer (14) for AC transmission. Anordnung nach Anspruch 1,
dadurch gekennzeichnet,
daß gleichnamige Wicklungsanschlüsse des Übertragers (14) an gleichnamige Anschlußklemmen (111, 131 / 112, 132) des ersten und zweiten Anschlußklemmenpaares (111, 112 / 131, 132) angeschlossen sind.Arrangement according to claim 1,
characterized,
that winding connections of the same name of the transformer (14) are connected to terminals of the same name (111, 131/112, 132) of the first and second pair of terminals (111, 112/131, 132).
EP94250295A 1993-12-14 1994-12-14 Device for galvanically isolated transmission of direct and alternating current signals Expired - Lifetime EP0658866B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4343540A DE4343540C2 (en) 1993-12-14 1993-12-14 Arrangement for the isolated transmission of direct and alternating current signals
DE4343540 1993-12-14

Publications (2)

Publication Number Publication Date
EP0658866A1 true EP0658866A1 (en) 1995-06-21
EP0658866B1 EP0658866B1 (en) 1999-05-06

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DE (2) DE4343540C2 (en)

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DE19925943A1 (en) * 1999-06-08 2000-12-21 Krohne Messtechnik Kg Circuit arrangement for data acquisition, transmission and evaluation
DE10335203A1 (en) * 2003-07-30 2005-03-10 Flowtec Ag Service interface for connection to field devices of process automation
DE102008012414A1 (en) * 2008-02-29 2009-09-03 Siemens Aktiengesellschaft Front end for use in sensor or actuator component of digital signal processing system, has hardware for maintaining potential separation between analog and digital circuit, and coupler transferring processing result to inner potential

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Also Published As

Publication number Publication date
DE59408212D1 (en) 1999-06-10
EP0658866B1 (en) 1999-05-06
ATE179826T1 (en) 1999-05-15
DE4343540C2 (en) 1995-12-07
DE4343540A1 (en) 1995-07-27

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