EP0986039A1 - Anordnung zur Stromversorgung einer Stromschleifesendestation - Google Patents
Anordnung zur Stromversorgung einer Stromschleifesendestation Download PDFInfo
- Publication number
- EP0986039A1 EP0986039A1 EP98116881A EP98116881A EP0986039A1 EP 0986039 A1 EP0986039 A1 EP 0986039A1 EP 98116881 A EP98116881 A EP 98116881A EP 98116881 A EP98116881 A EP 98116881A EP 0986039 A1 EP0986039 A1 EP 0986039A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- current
- charge pump
- regulator
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Classifications
-
- 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 receiving station and one Transmitter station and for the power supply of the transmitter station.
- Such a circuit arrangement is known from EP-A-0 744 724 known in which the two stations through a two-wire line are connected via the one between two limit values variable analog signal current is transmitted, the one detected in the transmitter by a sensor Measured value represents and for the operation of the transmitter forms the required supply current.
- the transmitter station has a circuit that is constant Operating voltage generated for the transmitter station, and them contains a controllable power source that is connected to the Two-wire current flowing depending on the Measured value determined and that from a supply voltage source is fed in the receiving station. It takes place the transmitter station has a voltage at its two inputs before, depending on the choice of the supply voltage source in can vary widely. For transmission of measured values the transmitter station ideally controls its input current so that it only depends on the measured value.
- the supply the sending station is done exclusively via the Two-wire line, the input voltage in general is greater than the internally required supply voltage. In the transmitting station is therefore the input voltage by a Linear regulator to the internally required supply voltage reduced. But this is the one available Supply current through the input current of the transmitter station limited. However, this limitation is flexibility regarding the use of the sensors and signal evaluation circuits limited in the transmitting station since it it may also be desirable to use sensors who need a larger current than you via the two-wire line can be supplied.
- the invention is therefore based on the object of providing a signal transmission and power supply arrangement which with regard to the sensors and signal processing units that can be used is very flexible in the transmitting station and with regard to the power supply to the respective circumstances can be adjusted.
- the invention provides an arrangement for signal transmission between a receiving station and a transmitting station and for supplying power to the transmitting station created where these two stations together are connected by a two-wire line via which an analog one that varies between two limit values Signal stream is transmitted to the one in the transmitter station represented by a sensor and the measured value for operation of the transmitter station forms, the transmitting station having a circuit which generates a constant operating voltage for the transmitter station, and a controllable current source in the transmitting station is provided, which over the two-wire line flowing current determined depending on the measured value and that from a supply voltage source in the receiving station is fed with the power source on Series current regulator is the one from the supply voltage source is fed in the receiving station, with the output the power source is connected to a charge pump, which from the voltage occurring at the output of the current source for the Operation of the sensor and a signal processing circuit connected to it generates the required operating voltage, and with the input or the output of the charge pump a parallel regulator to keep the input voltage constant or the output voltage of the charge
- a series regulator is provided.
- the power source is from a Voltage regulator bridges the one in a start-up phase Provides input voltage for the charge pump, the Power source is designed so that it is in the start-up phase delivers an output current only when the charge pump outputs an output voltage sufficient for its operation, wherein the voltage regulator is designed so that it in a locked state passes as soon as the output voltage the operating voltage is reached.
- the charge pump has a voltage transfer factor ⁇ 1.
- the arrangement for signal transmission shown in Figure 1 contains a receiving station 10 and a transmitting station 12, which are connected to each other via a two-wire line 14 are. There is a signal evaluation circuit in the receiving station 10 16, the symbolic as an ammeter is shown because of the two-wire line 14 to Receiving station 10 flowing current of the electrical to be evaluated Parameter is.
- the receiving station 10 also contains a supply voltage source 18 which is required for operation the signal transmission arrangement both on the receiving side and also provides the energy required on the transmission side.
- the transmitting station 12 contains a sensor 20, which in a process detects a process variable, for example a temperature, a pressure, a fill level or the like, as a measured value.
- the sensor 20 outputs its output signal, which represents the measured value, to a signal processing circuit 22, which generates a control signal proportional to the measured variable detected by the sensor 20.
- a circuit 24 contained in the transmitting station 12 generates the operating voltage required for the operation of the signal processing circuit 22 and the sensor 20, and at the same time sets the current flowing over the two-wire line 14 to one of the sensor 20 under the control of the control signal supplied to its input 25 measured value proportional current value I in .
- Its inputs 26 and 28 are connected to the two-wire line 14, while its outputs 30 and 32, at which it outputs the constant operating voltage, are connected to the supply voltage connections of the signal processing circuit 22 and the sensor 20.
- the structure of the circuit 24 is shown in a schematic diagram in FIG.
- the circuit contains a current source 34 which is designed as a series current regulator.
- the current set via the control signal at input 25 is kept constant at the set value by the series current controller, the voltage drop used at a measuring resistor 36 through which the set current flows being used as a reference variable.
- a voltage U V results due to the internal resistance of the other circuit parts .
- This voltage serves as a supply voltage for a charge pump 38, which delivers a voltage U out at its output, which represents the supply voltage for the signal processing circuit 22 and the sensor 20.
- This output voltage U out is kept constant by means of a voltage regulator 40 designed as a parallel regulator.
- the charge pump 38 conventionally consists of a Row of switches 38.1 - 38.4 and capacitors C1, C2, C3 and a control circuit 39 which switches 38.1 - 38.4 so control (open and close) that the capacitor C3 a charging voltage occurs that corresponds to the desired output voltage corresponds.
- the structure of the charge pump is in Figure 3 and shown in Figure 5 only schematically, because Structure and mode of operation of such circuits to the expert in different versions are known (for example from "Semiconductor Circuit Technology" by U. Tietze and Ch. Schenk, 1991, pp. 570, 571).
- the control signal at the input 25 sets the series current regulator 34 to a higher current value than can be derived from the charge pump 38, this current can be derived via an additional circuit unit 42, which acts as a voltage limiting circuit.
- the higher current supplied by the series current regulator 34 results in a higher voltage U V , and the voltage limiting circuit 42 can be designed so that it responds when a predetermined voltage value is exceeded and derives the excess current while achieving a voltage limitation.
- the circuit of Figure 2 enables within wide limits the setting of current and voltage values for the Operation of the signal processing circuit 22 and the sensor 20 in the transmitting station. Then an estimate the operating limits of the circuit shown in Figure 2 spelled out.
- U InMin U VBypass + U I Reg
- the series current regulator 34 can be operated with the output voltage U Out . However, special precautions must then be taken so that the circuit 24 starts up and supplies the required output voltage. For this purpose, there is the possibility of designing the series current regulator 34 in such a way that it supplies a possibly unregulated current to the charge pump 38 without its own supply voltage. The charge pump 38 is then able to generate an output voltage U Out . The series current controller 34 can then be operated with this output voltage.
- FIG. 3 shows a circuit diagram in which the basic structure of the series current controller 34, the Voltage limiting circuit 42, the charge pump 38 and of the voltage regulator 40 are shown. But be there noted that the structure of the respective circuit units is given only as an example. On the the respective structure is not important for the invention. Crucial are only the function of the invention individual circuit units and their interaction with the other circuit units.
- the series current regulator 34 is, according to FIG. 3, a simple series regulator which maintains the current flowing through the transistor T at a constant value which can be set via the operational amplifier OP by means of the control signal at the input 25.
- the resistor R located in the current regulator 34 between the emitter and collector of the transistor T has the purpose of enabling the circuit to start up. A small current can flow through this resistor R, even when the transistor T is blocked, which is sufficient as a starting current for the circuit.
- the voltage limiting circuit 42 is merely a zener diode, which limits the voltage occurring at the output of the current regulator 34 to a constant value. Depending on its design, the charge pump can achieve almost any voltage and current translations.
- the charge pump circuit shown is only one example; the structure and function of such charge pumps is known to the person skilled in the art and can be found in numerous references.
- the voltage regulator circuit 40 is also only a Zener diode, which keeps the value of the output voltage U Out constant.
- FIG. 4 shows in a block diagram how the circuit can be put into operation in such a case.
- This circuit contains a current regulator 44, which is initially blocked without its own operating voltage, that is to say it cannot deliver any current to the charge pump 38.
- the voltage regulator 46 is designed such that when the voltage value U V is reached at the output of the series current regulator 44, it is no longer effective, but rather changes into a blocked state in which it no longer bridges the current regulator 44.
- FIG. 5 shows a more precise circuit diagram that can be recognized lets how the individual components of the circuit of Figure 4 can be constructed. It can be seen that the series current controller 44 except one to be explained Difference, the voltage limiting circuit 42, the Charge pump 38 and voltage regulator circuit 40 as well as constructed in the circuit of Figure 3. It is only the voltage regulator 46 has been added, which, like that Circuit diagram shows, as a series voltage regulator is constructed. In the series current regulator 44, the transistor T is not as in the Series current regulator 34 bridged by a resistor. This resistance is not necessary in this case because here the voltage regulator 46 starts the circuit enables.
- both the Input voltage as well as the output voltage of the charge pump 38 kept constant.
- the mentioned voltage limiting circuit 42 used is nothing more than a parallel controller.
- Even the output side used circuit to keep the Output voltage of the charge pump 38 is a parallel regulator. But it is also possible to keep the input voltage constant to dispense with the charge pump 38, which is only requires to use a charge pump with larger input voltages or input currents work can.
- the charge pump input voltage is kept constant can keep the output voltage constant Charge pump can be dispensed with if a load dependency the output voltage can be tolerated.
- Using of two voltage regulators at the input and at the output of the Charge pump 38 it is possible to use one of the two regulators Train series regulator.
- charge pump has a voltage transfer factor of 1/2, which means that it is a Halving the voltage and doubling the current causes.
- charge pumps can also be used with others Voltage transfer factors are used if others Voltage and current ratios are desired.
- a transmission factor ⁇ 1 is used because it is an increased Electricity provided at the outlet of the charge pump can be.
- Circuits have the advantage that they can be used as integrated circuits can be built and that they enable the different in an extremely flexible way To deliver currents and voltages in the transmitter station for the operation of the respective sensor and its Processing circuit receiving output signal required become.
- This excellent integrability of all design variants is mainly due to the fact that in the circuits are not inductors, but essentially only well integrated capacitors ( ⁇ 1nF) for Come into play.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dc-Dc Converters (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
Description
- Figur 1
- eine schematische Übersichtsdarstellung einer Anordnung zur Signalübertragung zwischen einer Sendestation und einer Empfangsstation, in der die Erfindung anwendbar ist,
- Figur 2
- ein schematisches Blockschaltbild der erfindungsgemäß aufgebauten Spannungsversorgung für die Anordnung von Figur 1,
- Figur 3
- ein Schaltbild der Spannungsversorgung von Figur 2, wobei die einzelnen Schaltungseinheiten beispielhaft genauer in ihrem Aufbau dargestellt sind,
- Figur 4
- ein Blockschaltbild einer zweiten Ausführungsform einer erfindungsgemäß aufgebauten Spannungsversorgung für die Verwendung in der Anordnung von Figur 1 und
- Figur 5
- ein Schaltbild der Spannungsversorgung von Figur 4, wobei die einzelnen Schaltungseinheiten beispielhaft in ihrem Aufbau genauer dargestellt sind.
Claims (5)
- Anordnung zur Signalübertragung zwischen einer Empfangsstation (10) und einer Sendestation (12) sowie zur Stromversorgung der Sendestation (12), wobei diese beiden Stationen miteinander durch eine Zweidrahtleitung (14) verbunden sind, über die ein zwischen zwei Grenzwerten veränderlicher analoger Signalstrom übertragen wird, der einen in der Sendestation (12) von einem Sensor (20) erfaßten Meßwert repräsentiert und den für den Betrieb der Sendestation erforderlichen Versorgungsstrom bildet, wobei die Sendestation eine Schaltung (24) aufweist, die eine konstante Betriebsspannung für die Sendestation (12) erzeugt, und wobei in der Sendestation (12) eine steuerbare Stromquelle (34) vorgesehen ist, die den über die Zweidrahtleitung (14) fließenden Strom in Abhängigkeit von dem Meßwert bestimmt und die aus einer Versorgungsspannungsquelle in der Empfangsstation gespeist wird, wobei die Stromquelle (34) ein Serienstromregler ist, der aus der Versorgungsspannungsquelle (18) in der Empfangsstation (10) gespeist wird, mit dem Ausgang der Stromquelle (34) eine Ladungspumpe (38) verbunden ist, die aus der am Ausgang der Stromquelle (34) auftretenden Spannung die für den Betrieb des Sensors (20) und einer mit diesem verbundenen Signalverarbeitungsschaltung (22) erforderliche Betriebsspannung erzeugt, und mit dem Eingang oder dem Ausgang der Ladungspumpe 38 ein Parallelregler (40, 42) zum Konstanthalten der Eingangsspannung bzw. der Ausgangsspannung der Ladungspumpe (38) verbunden ist.
- Anordnung nach Anspruch 1, bei welcher zusätzlich zu dem Parallelregler am Eingang oder am Ausgang der Ladungspumpe (38) auf der jeweils anderen Seite der Ladungspumpe (38) ein weiterer Parallelregler vorgesehen ist.
- Anordnung nach Anspruch 1, bei welcher zusätzlich zu dem Parallelregler am Eingang oder am Ausgang der Ladungspumpe (38) auf der jeweils anderen Seite der Ladungspumpe ein Längsregler vorgesehen ist.
- Anordnung nach Anspruch 1, 2 oder 3, bei welcher die Stromquelle (44) durch einen Spannungsregler (46) überbrückt ist, der in einer Anlaufphase eine Eingangsspannung (UV1) für die Ladungspumpe (38) liefert, wobei die Stromquelle (44) so ausgebildet ist, daß sie in der Anlaufphase erst dann einen Ausgangsstrom liefert, wenn die Ladungspumpe (38) eine für seinen Betrieb ausreichende Ausgangsspannung abgibt, wobei der Spannungsregler (46) so ausgelegt ist, daß er in einen gesperrten Zustand übergeht, sobald die Ausgangsspannung (UOut) die Betriebsspannung erreicht.
- Anordnung nach einem der vorhergehenden Ansprüche, bei welcher die Ladungspumpe (38) einen Übertragungsfaktor < 1 hat.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98116881A EP0986039B1 (de) | 1998-09-07 | 1998-09-07 | Anordnung zur Stromversorgung einer Stromschleifesendestation |
DE59814313T DE59814313D1 (de) | 1998-09-07 | 1998-09-07 | endestation |
CA002281156A CA2281156C (en) | 1998-09-07 | 1999-08-30 | Assembly for signal transfer between a receiving station and a transmitting station as well as for power supply of the transmitting station |
US09/387,998 US6703943B1 (en) | 1998-09-07 | 1999-09-01 | Assembly for signal transfer between a receiving station and a transmitting station as well as for power supply of the transmitting station |
JP25309399A JP3348051B2 (ja) | 1998-09-07 | 1999-09-07 | 受信局と送信局との間の信号伝送用並びに前記送信局の電流給電用の装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98116881A EP0986039B1 (de) | 1998-09-07 | 1998-09-07 | Anordnung zur Stromversorgung einer Stromschleifesendestation |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0986039A1 true EP0986039A1 (de) | 2000-03-15 |
EP0986039B1 EP0986039B1 (de) | 2008-10-29 |
Family
ID=8232586
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98116881A Expired - Lifetime EP0986039B1 (de) | 1998-09-07 | 1998-09-07 | Anordnung zur Stromversorgung einer Stromschleifesendestation |
Country Status (5)
Country | Link |
---|---|
US (1) | US6703943B1 (de) |
EP (1) | EP0986039B1 (de) |
JP (1) | JP3348051B2 (de) |
CA (1) | CA2281156C (de) |
DE (1) | DE59814313D1 (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002045045A1 (de) * | 2000-12-01 | 2002-06-06 | Vega Grieshaber Kg | Elektronische messvorrichtung zur erfassung einer prozesswvariablen, und verfahren zum betreiben einer solchen messvorrichtung |
US7466748B2 (en) | 2000-12-01 | 2008-12-16 | Vega Grieshaber | Electronic measuring device for detecting a process variable, in particular a radar or ultrasonic filling level measuring device, and a method for operating a measuring device of this type |
EP2275781A1 (de) * | 2009-07-17 | 2011-01-19 | Itron France | Energiezähler mit Stromversorgung über einen M-Bus |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7339458B2 (en) * | 2005-05-20 | 2008-03-04 | Ambient Corporation | Power line communications interface and surge protector |
RU2404527C2 (ru) * | 2006-04-28 | 2010-11-20 | Майкро Моушн, Инк. | Интерфейс и способ питания контура шины |
CN101443828B (zh) * | 2006-05-12 | 2012-07-04 | Nxp股份有限公司 | 具有连接至附加管脚的隔直电容器的电路接口 |
US7907430B2 (en) * | 2008-12-18 | 2011-03-15 | WaikotoLink Limited | High current voltage regulator |
KR101005136B1 (ko) * | 2009-05-29 | 2011-01-04 | 주식회사 하이닉스반도체 | 고전압 발생 장치 |
DE102010063949A1 (de) * | 2010-12-22 | 2012-06-28 | Endress + Hauser Gmbh + Co. Kg | Messgerät |
JP5807030B2 (ja) * | 2013-02-18 | 2015-11-10 | Ckd株式会社 | 流体圧シリンダ用センサ |
US20150008867A1 (en) * | 2013-07-03 | 2015-01-08 | At&T Intellectual Property I, L.P. | Charge pump battery charging |
RU185926U1 (ru) * | 2018-05-23 | 2018-12-25 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Томский государственный университет систем управления и радиоэлектроники" | Устройство передачи информации по цепям питания |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1988002528A1 (en) * | 1986-10-02 | 1988-04-07 | Rosemount Inc. | Digital converter apparatus for improving the output of a two-wire transmitter |
EP0591926A2 (de) * | 1992-10-05 | 1994-04-13 | Fisher Controls International, Inc. | Kommunikationssystem und Verfahren |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3615463A1 (de) | 1986-05-07 | 1987-11-12 | Endress Hauser Gmbh Co | Anordnung zur signaluebertragung in einer messanordnung |
US5187474A (en) | 1986-10-02 | 1993-02-16 | Rosemount Inc. | Digital converter apparatus for improving the output of a two-wire transmitter |
EP0744724B1 (de) * | 1995-05-24 | 2001-08-08 | Endress + Hauser Gmbh + Co. | Anordnung zur leitungsgebundenen Energieversorgung eines Signalgebers vom Singnalempfänger |
US6064582A (en) * | 1997-02-11 | 2000-05-16 | The Foxboro Company | Current converter for increasing current and decreasing voltage |
-
1998
- 1998-09-07 DE DE59814313T patent/DE59814313D1/de not_active Expired - Lifetime
- 1998-09-07 EP EP98116881A patent/EP0986039B1/de not_active Expired - Lifetime
-
1999
- 1999-08-30 CA CA002281156A patent/CA2281156C/en not_active Expired - Fee Related
- 1999-09-01 US US09/387,998 patent/US6703943B1/en not_active Expired - Fee Related
- 1999-09-07 JP JP25309399A patent/JP3348051B2/ja not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1988002528A1 (en) * | 1986-10-02 | 1988-04-07 | Rosemount Inc. | Digital converter apparatus for improving the output of a two-wire transmitter |
EP0591926A2 (de) * | 1992-10-05 | 1994-04-13 | Fisher Controls International, Inc. | Kommunikationssystem und Verfahren |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002045045A1 (de) * | 2000-12-01 | 2002-06-06 | Vega Grieshaber Kg | Elektronische messvorrichtung zur erfassung einer prozesswvariablen, und verfahren zum betreiben einer solchen messvorrichtung |
US7466748B2 (en) | 2000-12-01 | 2008-12-16 | Vega Grieshaber | Electronic measuring device for detecting a process variable, in particular a radar or ultrasonic filling level measuring device, and a method for operating a measuring device of this type |
EP2275781A1 (de) * | 2009-07-17 | 2011-01-19 | Itron France | Energiezähler mit Stromversorgung über einen M-Bus |
WO2011006836A1 (fr) * | 2009-07-17 | 2011-01-20 | Itron France | Compteur d'energie a alimentation par un m-bus |
CN102483334A (zh) * | 2009-07-17 | 2012-05-30 | 伊特伦法国公司 | 由m-bus提供电力的能量表 |
Also Published As
Publication number | Publication date |
---|---|
CA2281156A1 (en) | 2000-03-07 |
CA2281156C (en) | 2002-07-09 |
EP0986039B1 (de) | 2008-10-29 |
JP3348051B2 (ja) | 2002-11-20 |
JP2000132781A (ja) | 2000-05-12 |
DE59814313D1 (de) | 2008-12-11 |
US6703943B1 (en) | 2004-03-09 |
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