WO2007077081A1 - Schaltungsanordnung zur versorgung eines feldgerätes der automatisierungstechnik - Google Patents
Schaltungsanordnung zur versorgung eines feldgerätes der automatisierungstechnik Download PDFInfo
- Publication number
- WO2007077081A1 WO2007077081A1 PCT/EP2006/069346 EP2006069346W WO2007077081A1 WO 2007077081 A1 WO2007077081 A1 WO 2007077081A1 EP 2006069346 W EP2006069346 W EP 2006069346W WO 2007077081 A1 WO2007077081 A1 WO 2007077081A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit
- converter
- field device
- current
- circuit arrangement
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
Definitions
- the invention relates to a circuit arrangement for supplying a field device of automation technology.
- Capture and / or influencing process variables Capture and / or influencing process variables.
- field devices are level gauges, mass flow meters, pressure and temperature measuring devices, etc., which detect as sensors the corresponding process variable level, flow, pressure or temperature.
- actuators z. B. as valves the flow of a liquid in a pipe section or as pumps control the level in a container.
- Communication systems HART, Profibus, Foundation Fieldbus, etc.
- higher-level units eg control systems or control units
- Field devices are generally those devices which are connected directly to a field bus and serve for communication with the higher-level units (eg remote I / Os, gateways, linking devices).
- the available power is usually subject to certain limitations.
- the input voltage normally varies between 10 and 36 V.
- the power available on the input side first has to be determined. This is done by measuring the Terminal voltage and the value of the set loop current.
- DC-DC converter is used to power a consumer unit, which typically consists of a CPU, a Mes s amplifier and a sensor.
- the DC-DC converter also serves for galvanic isolation of the load unit from the 2-wire supply voltage. Clocked converters allow a DC voltage conversion with a relatively high efficiency. They are therefore often used in field devices.
- the object of the invention is to provide a circuit arrangement for field devices, which does not have the above-mentioned disadvantages, which is particularly simple in construction, which allows a simple power adjustment and generates only little power loss.
- Automation technology consisting of an input circuit with a 2-wire connection, a downstream DC-DC converter and a load circuit, characterized in that the input circuit comprises a modulator unit which is connected to a current control circuit and the DC-DC converter and this drives so that an adjustable total current I s from the 2-wire connection is recorded
- the essential idea of the invention is to use for supplying a regulated DC-DC converter, which is used for galvanic isolation and with which the current absorbed by the 2-wire can be adjusted.
- a regulated DC-DC converter which is used for galvanic isolation and with which the current absorbed by the 2-wire can be adjusted.
- the surplus electricity is measured. It is a direct measure of the power available there. By simply minimizing the excess current, consumption on the consumer side can be optimally adjusted.
- the power available on the input side can be used optimally.
- the circuit arrangement has in principle only one controller and generates significantly less losses than the known circuit arrangements.
- FIG. 1 Block diagram of a field device of the automation technology and a receiving unit
- FIG. 2a circuit arrangement according to St. d. Technology
- Fig. 3 waveform of the output signal in the circuit arrangement according to 2.
- FIG. 1 is a block diagram of a field device Fl of
- the connection between field device Fl and receiving unit EE takes place via a 2-conductor current loop LS. Via these, a measured value which is recorded by the field device F1 can be transmitted to the receiving unit EE as a 4-20 mA current signal I s .
- the field device Fl consists essentially of an input circuit ES, a DC voltage converter G and a load circuit VS.
- the DC-DC converter G ensures the electrical isolation between the primary-side circuit and the load circuit on the secondary side.
- Fig. 2a the circuit arrangement S according to the invention for the field device Fl is shown in more detail. It has a 2-wire connection A for connection to the 2-wire current loop LS on.
- Terminal A consists of two input terminals EK1 and EK2.
- a supply line ZL1 leads from the input terminal EK1 to a DC voltage converter G.
- a capacitor C1 Also connected to the supply line ZL1 is a capacitor C1.
- From the input terminal EK2 leads a feed line ZL2 via a measuring resistor R measurement also to the DC-DC converter G.
- the Mes s resistance R Mess is part of a current control circuit RS, which additionally consists of a resistor Rl and a downstream operational amplifier OP.
- the z. B may consist of an ASIC or of a microprocessor with memory components and a corresponding periphery.
- An essential part of the circuit S is a modulator M, which consists of a comparator K, an oscillator O and two AND gates UGl, UG2.
- the output of the comparator K and two pulse outputs PAl and PAl of the oscillator O are respectively connected to the corresponding inputs of the AND gates UGl and UG2.
- the AND gates UG1 and UG2 each control a power transistor T1 or T2. Both power transistors Tl, T2 are provided in the supply line ZL2.
- the DC-DC converter G is a push-pull converter and typically consists of three coils SPL, SP2, SP3, two rectifier diodes Dl, D2 of a choke coil L and a storage capacitor C2.
- the output of the DC-DC converter G is connected to the load circuit VS.
- the load circuit VS consists mainly of the actual consumer unit VE (sensor, amplifier and microprocessor). Parallel to the consumer unit VE a Zener diode Z and a shunt resistor R shunt are connected.
- a conventional circuit S for the field device Fl is shown in more detail. It also has a 2-wire connection A 'for connection to the 2-wire current loop LS.
- the connection A ' consists of two input terminals EKl' and EK2 '.
- a supply line ZLl ' representser from the input terminal EKl' via a DC-DC switching regulator RG3 to a DC-DC converter G '.
- Also connected to the supply line ZL1 ' is a capacitor CT.
- a power transistor T3 is arranged, which serves as a current regulator RGl and is controlled via a current control circuit RS'.
- the measuring resistor R ' Mess is part of the Current control circuit RS ', which additionally consists of a resistor Rl' and a downstream operational amplifier OP '.
- a pair of switches SP the predetermined by an oscillator O 'with a fixed
- Oscillator frequency is controlled, is provided in the supply line ZL2.
- the switch pair SP is followed by the DC-DC converter G ', which provides for a galvanic isolation between the primary-side circuit part and the load unit VE V on the secondary side.
- the RG2 voltage regulator is a parallel regulator that dissipates excess current.
- the voltage regulator RG2 is followed by the DC-DC switching regulator RG3.
- the controller RG3 provides at its output a constant output voltage, which is converted by means of the unregulated DC converter G v in the available on the secondary side of the converter supply voltage of 5.5V.
- the clocked DC-DC converter G typically consists of three coils SPL, SP2, SP3, which a rectifier diode Dl and a storage capacitor C2 are connected downstream.
- the circuit arrangement S ' is constructed considerably more complicated than the circuit arrangement SE according to the invention.
- the power available on the input side must be determined by measuring the terminal voltage and this information must then be transmitted to the consumer unit VE in order to allow energy to be adjusted Power losses given, which are undesirable especially in 2-wire devices.
- Supply line ZLl and ZL2 flowing total current I s is set via the modulator unit M.
- the current control circuit RS which as the actual value of the total current I s via the voltage drop AU 1 at Mes s resistance R measurement is used.
- the output signal Sl of the computer unit RE specifies the setpoint value of the total current I s .
- About the operational amplifier OP is the Difference between the difference between the setpoint and the actual value amplified and fed to the input El of the comparator K.
- At the second input of the comparator K is applied to a reference voltage.
- the output signal of the comparator K is shown in FIG. 3 for two different total current values I s .
- the pulse width of the output signal S2 of the comparator K becomes relatively narrow for small values of the total current I s and wide for larger values.
- the pulses at the output of the oscillator O are transmitted to the respective transistors T1 or T2.
- the excess current I shunt must be dissipated via the shunt resistor Ra unt .
- the voltage drop ⁇ U 2 at the shunt resistor R shunt is directly proportional to the power available in the load circuit VS. This voltage drop can be evaluated in order, if necessary, to switch on further units or functionalities of the consumer unit VE, which have an increased energy consumption. As a result, the available power can be used optimally. The excess current is dissipated on the consumer side and minimized if necessary.
- the measured value determined by the sensor is transmitted galvanically separated to the computer unit RE, which determines therefrom the setpoint value S1 for the total current I s .
- the invention allows in a simple way the current control and
- the DC-DC converter G With only one controlled unit, the DC-DC converter G, the total current I s recorded by the 2-conductor loop LS is set.
- Additional voltage regulators may be omitted. There is no expensive power management necessary. The available power can be determined directly in the consumer circuit VS and optionally adjusted there.
- the invention is also suitable for field devices that are connected to a fieldbus system (eg Profibus, Foundation Fieldbus) or that have a HART Have interface.
- the recorded total current I s can also be set via the modulator unit M here.
- additional components in the circuit arrangement S are necessary, which the person skilled in the art knows and which are easy to integrate.
- the total current I s is usually constant, it is still advantageous if it is adjustable.
- the input voltage can also be optimally utilized in these field devices.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/086,881 US20110187205A1 (en) | 2005-12-29 | 2006-12-05 | Circuit Arrangement for Supplying a Field Device of Automation Technology |
EP06830392A EP1966876A1 (de) | 2005-12-29 | 2006-12-05 | Schaltungsanordnung zur versorgung eines feldgerätes der automatisierungstechnik |
JP2008547931A JP2009522990A (ja) | 2005-12-29 | 2006-12-05 | 自動化技術のフィールド・デバイスを提供するための回路装置 |
CN200680049569.0A CN101351951B (zh) | 2005-12-29 | 2006-12-05 | 用于向自动化技术的现场设备供电的电路系统 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005063054A DE102005063054A1 (de) | 2005-12-29 | 2005-12-29 | Schaltungsanordnung zur Versorgung eines Feldgerätes der Automatisierungstechnik |
DE102005063054.5 | 2005-12-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007077081A1 true WO2007077081A1 (de) | 2007-07-12 |
Family
ID=37888355
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2006/069346 WO2007077081A1 (de) | 2005-12-29 | 2006-12-05 | Schaltungsanordnung zur versorgung eines feldgerätes der automatisierungstechnik |
Country Status (7)
Country | Link |
---|---|
US (1) | US20110187205A1 (de) |
EP (1) | EP1966876A1 (de) |
JP (1) | JP2009522990A (de) |
CN (2) | CN101351951B (de) |
DE (1) | DE102005063054A1 (de) |
RU (1) | RU2375808C1 (de) |
WO (1) | WO2007077081A1 (de) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007029136A1 (de) * | 2007-06-25 | 2009-01-02 | Vega Grieshaber Kg | Vorrichtung und Verfahren zum Generieren einer Bedienoberflächenkonfiguration für ein Feldgerät |
DE102007054924A1 (de) * | 2007-11-15 | 2009-05-20 | Endress + Hauser Process Solutions Ag | Verfahren zum Betreiben eines Feldgerätes, sowie Kommunikationseinheit und Feldgerät |
DE102007054923A1 (de) * | 2007-11-15 | 2009-05-20 | Endress + Hauser Process Solutions Ag | Verfahren zum Betreiben eines Feldgerätes |
DE102008032648A1 (de) * | 2008-07-10 | 2010-01-14 | Abb Technology Ag | Elektronische Einrichtung und Verfahren zur Betriebsspannungsversorgung von Feldgeräten |
DE102008043199A1 (de) * | 2008-10-27 | 2010-04-29 | Endress + Hauser Process Solutions Ag | Autarkes Feldgerät |
US8519863B2 (en) | 2010-10-15 | 2013-08-27 | Rosemount Inc. | Dynamic power control for a two wire process instrument |
DE102010063949A1 (de) | 2010-12-22 | 2012-06-28 | Endress + Hauser Gmbh + Co. Kg | Messgerät |
JP2013097697A (ja) * | 2011-11-04 | 2013-05-20 | Azbil Corp | フィールド機器 |
DE102014107991B4 (de) * | 2014-06-05 | 2020-01-30 | Krohne Messtechnik Gmbh | Feldgerät mit Schaltwandlerschaltung |
DE102017110633B3 (de) * | 2017-05-16 | 2018-11-15 | Krohne Messtechnik Gmbh | Anzeigegerät für die Prozessautomation |
DE102019118839A1 (de) * | 2019-07-11 | 2021-01-14 | Endress+Hauser SE+Co. KG | Verfahren zum Betreiben eines Feldgerätes der Automatisierungstechnik |
DE102019134907A1 (de) * | 2019-12-18 | 2021-06-24 | Endress+Hauser Flowtec Ag | Elektronik |
DE102022120513B4 (de) | 2022-08-15 | 2024-04-25 | Krohne S.A.S. | Messgerät und Verfahren zum Betreiben eines Messgeräts |
Citations (3)
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US6680690B1 (en) * | 2003-02-28 | 2004-01-20 | Saab Marine Electronics Ab | Power efficiency circuit |
WO2004054080A1 (ja) * | 2002-12-12 | 2004-06-24 | Sanken Electric Co., Ltd. | 直流電源装置 |
US6855016B1 (en) * | 2002-07-16 | 2005-02-15 | Patrick Lee Jansen | Electric watercycle with variable electronic gearing and human power amplification |
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US4030014A (en) * | 1975-04-25 | 1977-06-14 | Rochester Instrument Systems, Inc. | Current-to-current electrical isolator |
US4901756A (en) * | 1989-05-11 | 1990-02-20 | Rosemount Inc. | I/P converter with simulated compensation |
DE4121961A1 (de) * | 1991-06-28 | 1993-01-07 | Siemens Ag | Schaltungsanordnung zur energieversorgung von feldgeraeten |
JP3425900B2 (ja) * | 1999-07-26 | 2003-07-14 | エヌイーシーマイクロシステム株式会社 | スイッチングレギュレータ |
DE10037996C2 (de) * | 2000-08-03 | 2003-04-17 | Siemens Ag | Elektronisches Gerät, insbesondere Feldgerät |
DE60022764T2 (de) * | 2000-10-27 | 2006-07-13 | Invensys Systems, Inc., Foxboro | Busspannungsdetektor in einem Feldgerät |
DE10059644A1 (de) * | 2000-12-01 | 2002-06-13 | Siemens Ag | Schaltungsanordnung für DC/DC-Wandler mit niedriger Ausgangsspannung |
JP2003299347A (ja) * | 2002-02-01 | 2003-10-17 | Seiko Instruments Inc | Pwmスイッチングレギュレータ制御回路、pwmスイッチングレギュレータ及び電子機器 |
CN1167183C (zh) * | 2002-08-01 | 2004-09-15 | 上海交通大学 | 直流-直流变换集成电路 |
US7579842B2 (en) * | 2002-09-26 | 2009-08-25 | Eaton Power Quality Company | Battery management apparatus |
US6956382B2 (en) * | 2002-11-22 | 2005-10-18 | Saab Rosemount Tank Radar Ab | Isolation circuit |
JP3705495B2 (ja) * | 2003-02-03 | 2005-10-12 | Smk株式会社 | スイッチング電源回路の定電流出力制御方法と定電流出力制御装置 |
JP3696604B2 (ja) * | 2003-05-23 | 2005-09-21 | ローム株式会社 | 直流−交流変換装置、及び交流電力供給方法 |
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DE102006022819A1 (de) * | 2005-05-23 | 2007-01-04 | Infineon Technologies Ag | Schaltungsanordnung zum Versorgen einer Last mit einem Ausgangsstrom |
-
2005
- 2005-12-29 DE DE102005063054A patent/DE102005063054A1/de not_active Withdrawn
-
2006
- 2006-12-05 CN CN200680049569.0A patent/CN101351951B/zh not_active Expired - Fee Related
- 2006-12-05 JP JP2008547931A patent/JP2009522990A/ja active Pending
- 2006-12-05 RU RU2008131055/09A patent/RU2375808C1/ru not_active IP Right Cessation
- 2006-12-05 US US12/086,881 patent/US20110187205A1/en not_active Abandoned
- 2006-12-05 CN CN201410768159.8A patent/CN104578805A/zh active Pending
- 2006-12-05 EP EP06830392A patent/EP1966876A1/de not_active Ceased
- 2006-12-05 WO PCT/EP2006/069346 patent/WO2007077081A1/de active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6855016B1 (en) * | 2002-07-16 | 2005-02-15 | Patrick Lee Jansen | Electric watercycle with variable electronic gearing and human power amplification |
WO2004054080A1 (ja) * | 2002-12-12 | 2004-06-24 | Sanken Electric Co., Ltd. | 直流電源装置 |
US6680690B1 (en) * | 2003-02-28 | 2004-01-20 | Saab Marine Electronics Ab | Power efficiency circuit |
Also Published As
Publication number | Publication date |
---|---|
RU2375808C1 (ru) | 2009-12-10 |
CN101351951B (zh) | 2015-07-08 |
US20110187205A1 (en) | 2011-08-04 |
CN104578805A (zh) | 2015-04-29 |
EP1966876A1 (de) | 2008-09-10 |
DE102005063054A1 (de) | 2007-07-05 |
CN101351951A (zh) | 2009-01-21 |
JP2009522990A (ja) | 2009-06-11 |
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