WO2017041987A1 - Circuit électronique pour l'alimentation autonome d'un premier et d'un second module d'un appareil de terrain, appareil de terrain et procédé correspondant - Google Patents

Circuit électronique pour l'alimentation autonome d'un premier et d'un second module d'un appareil de terrain, appareil de terrain et procédé correspondant Download PDF

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Publication number
WO2017041987A1
WO2017041987A1 PCT/EP2016/069197 EP2016069197W WO2017041987A1 WO 2017041987 A1 WO2017041987 A1 WO 2017041987A1 EP 2016069197 W EP2016069197 W EP 2016069197W WO 2017041987 A1 WO2017041987 A1 WO 2017041987A1
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WO
WIPO (PCT)
Prior art keywords
module
energy
bus
field device
branch
Prior art date
Application number
PCT/EP2016/069197
Other languages
German (de)
English (en)
Inventor
Bernd Strütt
Gerd BECHTEL
Christian Seiler
Original Assignee
Endress+Hauser Gmbh+Co. Kg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Endress+Hauser Gmbh+Co. Kg filed Critical Endress+Hauser Gmbh+Co. Kg
Publication of WO2017041987A1 publication Critical patent/WO2017041987A1/fr

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L12/40006—Architecture of a communication node
    • H04L12/40045—Details regarding the feeding of energy to the node from the bus
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/34—Director, elements to supervisory
    • G05B2219/34313—Power supply for communication delivered by, derived from 4-20-mA current loop

Definitions

  • the invention relates to an electronic circuit for autonomously supplying a first module and a second module of a field device of process automation with energy from a two-conductor bus.
  • the invention further relates to a field device comprising such a circuit.
  • the invention further relates to a corresponding method.
  • field devices are often used to detect and / or influence process variables. As field devices are in the
  • field devices generally also refer to those units which are connected directly to a field bus and serve for communication with a control station, such as a control system, such as a control system.
  • a control station such as a control system, such as a control system.
  • field devices are connected to a control center using two-wire technology.
  • power is sent to the power supply and communication signals are sent via the same line: a wire for the way out, a wire for the way back.
  • power and signal use the same line; there is no separate energy supply.
  • This current or the corresponding power must be managed by the field devices and shared among the individual components of the field device. For example, the sensor element, the communication and the control have to work together with the existing power budget.
  • one or more capacitors are required to buffer the energy from the two-wire field bus in order to make measuring and sending the data with the limited power budget possible in the first place.
  • US 7,262,693 discloses the use of a capacitor to latch the energy from the bus to then provide it to a wireless module. If the capacitor is chosen too small, the measurement may need to be interrupted. On the other hand, capacitors which are too large are disadvantageous for use in the Ex area. In addition, space for large capacitors may not be available.
  • the above-mentioned wireless module disclosed in US 7,262,693 is generally a module that temporarily requires a large power.
  • the invention has for its object to provide an alternative circuit that provides energy from a two-bus for different connection modules.
  • a circuit comprising: a first branch, comprising at least one first diode, which is connected in the forward direction to the two-line bus, and one, the two-wire bus with energy chargeable, first energy storage, wherein the first energy storage of the first diode downstream is, and the first module, wherein the first module is powered by the first energy storage; and a second branch connected in parallel with the first branch, comprising at least the second module, wherein the second module is powered solely by the two-conductor bus.
  • the electronic circuit can be prevented that the second module accesses the energy storage. This is achieved by the first diode. Thus, no energy is provided by the energy store in the first branch for the second module in the second branch and no energy is shared between the two branches. It is prevented that energy is taken from the first branch. In other words, a flow of energy from the first branch to the second branch is prevented.
  • the wireless module of US 7,262,693 is generally a module that temporarily requires high power. This type of module is intended in the sense of this
  • the first module is generally a module with a temporarily increased power consumption
  • the "second module” is a module that consumes relatively little energy or power, but at least only as much as the two-conductor bus can deliver continuously.
  • the first module comprises a sensor element for detecting a measured variable, wherein the sensor element forwards values to a wireless module, and wherein the second module comprises the wireless module for wireless transmission of the values to a higher-level unit.
  • the sensor element is fed by the first energy store.
  • Values in the sense of this invention are to be understood in a first advantageous embodiment as “values dependent on the measured variable”. That is, the sensor element leads from the Measured variable dependent values to the wireless module, and the wireless module wirelessly transmits the values dependent on the measured value to a higher-level unit.
  • values are to be understood as parameters, whereby “parameters” here are to be understood as an actuating or influencing variable which acts on the sensor element and thus changes the behavior of the sensor element or
  • the sensor element forwards parameters to the wireless module, the wireless module wirelessly transmitting these parameters to a higher-level unit.
  • parameters are transmitted in the opposite direction, i. a higher-level unit wirelessly transmits parameters to the wireless module, which sends the parameters to the wireless module
  • the first module thus comprises a sensor element, for example for detecting the fill level, for example according to the radar principle.
  • a sensor element for example for detecting the fill level, for example according to the radar principle.
  • the first module comprises a sensor element for determining a
  • Analysis parameters in particular for measuring pH, redox potential, also ISFET, conductivity, or oxygen.
  • Further advantageous embodiments comprise sensor elements for detecting the flow according to the principles of Coriolis, magnetic induction, vortex and ultrasound. Further advantageous embodiments include sensor elements for
  • the first module comprises a wireless module with increased energy consumption, that is to say a WLAN module, in particular according to the standard IEEE 802.1 1.
  • the electronic circuit can thus be prevented that also contributes
  • Wireless module accesses the energy storage. This is achieved by the first diode. It is thus provided by the energy store in the first branch no energy for the wireless module in the second branch. The only connection between the wireless module and the sensor element are the communication links for sending measurement data. However, no energy is shared between the two branches.
  • Another aspect of the electronic circuit is the self-controlling power management of the circuit. The capacity of the energy storage is designed so that enough energy is available for a complete measurement cycle. Therefore, a measurement will always be able to be completed, a current measurement will be delivered and forwarded to the wireless module accordingly. If the wireless module is power for communication needs, which is taken directly from the two-conductor bus, then the energy storage for the measurement is not loaded. In an advantageous embodiment, the state of charge of the energy storage is monitored by a measuring circuit and a measurement is only allowed if enough energy is available. For this reason, get one
  • the second branch further comprises: a second diode, which is connected in the forward direction to the two-line bus, and one, from
  • the two branches are thus self-sufficient in terms of energy. They can work without the energy of each other. A synchronization of the two branches is not necessary.
  • the first and / or the second branch comprise a DC-DC converter for converting the voltage from the two-wire bus into a voltage value that can be used by the wireless module or the sensor element.
  • the DC-DC converter is the first energy storage and / or the second
  • the wireless module is a Bluetooth module, in particular the Bluetooth module is sufficient for the protocol stack Low Energy.
  • the second module comprises a module which can be continuously fed by the two-conductor bus. A Bluetooth module with the protocol stack low energy meets this requirement.
  • the second module comprises a
  • Sensor element that consumes little energy, at least only as much as the two-conductor bus can deliver continuously.
  • An example of this is a temperature or pressure sensor.
  • the circuit comprises a bus module, which connects the circuit to the two-wire bus, wherein the bus module is configured to support at least one of the FOUNDATION Fieldbus, PROFIBUS PA or HART protocols, and the two-wire bus is a corresponding bus.
  • the circuit can be connected to a process automation bus.
  • the circuit includes a 4..20 mA current output when the bus module supports the HART protocol.
  • an analog communication can be ensured.
  • the object is further achieved by field device of process automation, comprising a circuit described above.
  • the field device is a
  • the field device is used as a measuring device for detecting the
  • Point level in particular according to the ultrasound principle or by means of capacitive methods configured.
  • the field device is an analysis measuring device, in particular the sensor element is for measuring pH,
  • Redox potential also designed by means of an ISFET, conductivity, turbidity or oxygen.
  • the field device is a
  • Flow sensor in particular according to the principles Coriolis, magnetic induction, vortex and ultrasound.
  • the invention is further achieved by a method comprising the steps of supplying a sensor element with energy from an energy store, the energy store being charged with energy from a two-conductor bus, supplying a wireless module with energy exclusively from the two-conductor bus, detecting the measured variable by the sensor element, forwarding the value dependent on the measured value to a wireless module, and wireless transmission of the values dependent on the measured value to a higher-level unit by a wireless module.
  • the state of charge of the energy store is monitored and a detection of the measured variable only takes place if sufficient energy is available for a measuring cycle. For this reason, a wireless communication always gets enough energy directly from the two-way bus. The measurement is delayed until the energy store is full. A measurement will be started afterwards.
  • parameters are forwarded from the sensor element to the wireless module, which then wirelessly from the wireless module to a
  • Parameters are sent to the wireless module by the parent unit and forwarded by the wireless module to the sensor element.
  • FIG. 1 shows the field device according to the invention
  • FIG. 2a / b the circuit according to the invention in a schematic overview in a first (Fig. 2a) and second (Fig. 2b) embodiment
  • Fig. 3 shows the circuit according to the invention in a further embodiment.
  • FIG. 1 shows a field device FG of the process automation technology, for example a
  • the sensor is a pH, redox potential, ISFET, conductivity, turbidity or oxygen sensor.
  • Further possible sensors are flow sensors according to the principles of Coriolis, magnetic induction, vortex and ultrasound.
  • Other possible sensors are sensors for measuring the level according to the principles of guided and free-radiant
  • Radar as well as ultrasound, also for the detection of a limit level, whereby capacitive methods can also be used to detect the limit level.
  • the field device FG determines a measured variable of a medium 1, in the example in a cup as shown on the left side. However, other containers such as pipes, basins (as shown on the right side), container, boiler, pipe, pipe or similar. possible.
  • the field device FG communicates with a control station, such as directly with a control system 5 or with an intermediate transmitter. Also, the transmitter may be part of the field device, such as in the case of the level sensor. The communication to the
  • Control system 5 takes place via a two-conductor bus 4, for example via HART, PROFIBUS PA or FOUNDATION Fieldbus. It is also possible to design the interface 6 to the bus additionally or alternatively as a wireless interface, such as the WirelessHART standard (not shown), via WirelessHART a connection directly to a control system via a gateway. In addition, a 4..20 mA interface is optionally or additionally provided in the case of the HART protocol (not shown). Is this done?
  • an interface 6 is at the bus end of the field device FG
  • the interface 6 connects the field device FG to the bus 4, the field device comprises a corresponding bus module
  • the interface 6 is configured, for example in the case of the pH sensor, as a galvanically isolating, in particular as inductive, interface then two parts with a first part on the field device side and a second part on the bus side
  • a suitable cable with or without galvanic isolation is used.
  • Possible versions include a cable with an M12 or 7/8 "plug
  • the field device FG further comprises an electronic circuit 2 comprising a
  • the wireless module BT for wireless communication 3.
  • the wireless module BT is configured approximately as a Bluetooth module.
  • the Bluetooth module satisfies the low energy protocol stack as "Bluetooth Low Energy” (also known as BTLE, BLE, or Bluetooth Smart).
  • the field device FG thus satisfies at least the standard "Bluetooth 4.0.”
  • the communication 3 is performed by the field device FG to a higher-level unit H.
  • Higher-level unit H is, for example, a mobile unit such as a mobile phone, a tablet, a notebook, or the like.
  • the higher-level unit H can also be designed as a non-portable device, such as a computer.
  • the higher-level unit is a display with a corresponding interface.
  • Fig. 2a and Fig. 2b show the electronic circuit 2 in more detail.
  • the field device FG is connected as mentioned via the interface 6 with the Zweileiterbus 4.
  • the electronic circuit 2 comprises a first branch Z1 and a second branch Z2 parallel to the first branch Z1.
  • the first branch Z1 comprises a first diode D1 in the forward direction to the two-wire bus 4. Shown is the connection of the diode D1 with the anode at the positive pole of the two-wire bus 4. However, without inventive step, a correspondingly opposite configuration is possible.
  • the first branch Z1 further comprises a first energy store C1, which is connected downstream of the first diode D1. at the energy storage C1 is about a capacitor for storing energy.
  • an energy store is not a filter capacitor, smoothing capacitor, a capacitor for ensuring the electromagnetic compatibility or a capacitor such as in
  • the energy storage C1 is directly from the
  • Two-conductor bus 4 loadable Connected downstream of the energy store C1 is a sensor element M for detecting the measured variable, i. the sensor element M is fed by the energy storage C1. Between sensor element M and energy storage C1 is a sensor element M for detecting the measured variable, i. the sensor element M is fed by the energy storage C1. Between sensor element M and energy storage C1 is a sensor element M for detecting the measured variable, i. the sensor element M is fed by the energy storage C1. Between sensor element M and energy storage C1 is a
  • the DC converter DC converts the input voltage of about 10-45 V to about 3-5 V.
  • the energy storage device C1 supplies the sensor element M with energy.
  • the Zweileiterbus 4 does not provide enough energy, so that the sensor element M could be continuously supplied from the Zweileiterbus 4 with energy. Therefore, a measurement takes place only when the energy storage C1 is sufficiently filled and a complete measurement cycle can take place.
  • the first branch Z1 also includes a corresponding measuring circuit to the
  • the sensor element M forwards the measurement data or parameters, see below, to the wireless module BT.
  • communication lines Tx and Rx are used. Shown here is in the first branch Z1, a sensor element M, via the
  • Energy storage C1 is supplied with energy, since the energy requirement is greater than the two-wire bus 4 could deliver continuously. In general, it is in the
  • a wireless module with an increased energy requirement can be selected, for example a WLAN module. If a WLAN module is used in the first branch Z1, in the second branch Z2 a sensor element is used which can be supplied continuously from the bus 4, for example a temperature or pressure sensor, see below.
  • the second branch Z2 comprises a wireless module BT for the wireless transmission of the values dependent on the measured value to the higher-level unit H. Before the wireless module BT, a DC-DC converter DC is connected, which converts the voltage of about 10-45 V to 3-5 V.
  • parameters are transmitted, whereby as "parameter”, as mentioned, an actuating or influencing quantity is to be understood, which acts on the sensor element and thus changes the behavior of the sensor element or provides information about the state of the sensor element.
  • parameters can also be transmitted in the opposite direction, ie a higher-level unit wirelessly transmits parameters to the wireless module, which forwards the parameters to the sensor element.
  • the wireless module BT is powered exclusively by the two-conductor bus 4 with energy.
  • the wireless module BT never needs more power than the dual-bus 4 could deliver continuously. For this reason, no further capacitor, generally no further energy storage, is necessary in this branch.
  • a sensor element which can be supplied with energy continuously from the bus 4, for example a temperature or pressure sensor.
  • the electronic circuit 2 can be prevented that also the wireless module BT accesses the energy storage C1. This is achieved in particular by the decoupling diode D1. It is thus provided by the energy storage C1 no energy for the wireless module BT.
  • Wireless module BT are the communication links Tx and Rx. However, no energy is shared between the two branches Z1 and Z2.
  • Another aspect of the electronic circuit 2 is the self-controlling power management of the measurement circuit.
  • the capacity of the energy storage C1 is designed so that enough energy is available for a complete measurement cycle. Therefore, a measurement will always be able to be completed, a current measurement will be delivered and forwarded accordingly to the wireless module BT. If the wireless module BT needs energy for the communication, which - as mentioned - is taken directly from the Zweileiterbus 4, then the energy storage device C1 is not charged for the measurement or can not even be charged. As mentioned, the state of charge of the energy storage C1 is monitored and measurement is only allowed if there is enough energy available. For this reason, the wireless module BT for the wireless communication 3 always gets enough energy directly from the Zweileiterbus 4. The measurement is delayed until the energy storage is full. A measurement will be started afterwards.
  • FIG. 2b shows a development in which the second branch Z2 likewise comprises a diode, which is designated by the reference symbol D2. This is connected in the same configuration as the diode D1.
  • the second branch Z2 also includes an energy store, here referred to as C2. The above applies analogously to C2. It is thus also prevented that energy is taken from the second branch Z2 and it is also a
  • Fig. 3 shows an embodiment in which the DC-DC converter DC to the first
  • Energy storage C1 is not downstream. Instead, the DC-DC converter DC is connected upstream of the energy store C1 and the diode D1.
  • an additional linear regulator L between DC-DC converter DC and wireless module BT can be switched.
  • another DC-DC converter DC is possible. Not shown, but without inventive step, it is possible that a similar circuit as in Fig. 2b, ie with additional components diode D2 and second energy storage C2 in the second branch Z2, is constructed.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

La présente invention concerne un circuit électronique (2) pour l'alimentation autonome d'un premier et d'un second module (BT) d'un appareil de terrain (FG) en automatisation de processus, avec de l'énergie depuis un bus bifilaire (4), comprenant : une première branche (Z1) qui comprend au moins une première diode (D1) qui est connectée dans le sens passant au bus bifilaire (4), et un premier accumulateur d'énergie (C1) qui peut être chargé en énergie par le premier bus bifilaire (4), le premier accumulateur d'énergie (C1) étant connecté en aval de la première diode (D1), et le premier module (M), le premier module (M) étant alimenté en énergie par le premier accumulateur d'énergie (C1) ; et une seconde branche (Z2) qui est connectée en parallèle de la première branche (Z1) et comprend au moins le second module (BT), le second module (BT) étant alimenté en énergie exclusivement par le bus bifilaire (4). L'invention concerne par ailleurs un appareil de terrain comprenant un circuit (2) de ce type et un procédé correspondant.
PCT/EP2016/069197 2015-09-10 2016-08-12 Circuit électronique pour l'alimentation autonome d'un premier et d'un second module d'un appareil de terrain, appareil de terrain et procédé correspondant WO2017041987A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015115273.8A DE102015115273A1 (de) 2015-09-10 2015-09-10 Elektronische Schaltung zum autarken Versorgen eines ersten und zweiten Moduls eines Feldgeräts, Feldgerät und entsprechendes Verfahren
DE102015115273.8 2015-09-10

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WO2017041987A1 true WO2017041987A1 (fr) 2017-03-16

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WO (1) WO2017041987A1 (fr)

Cited By (1)

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WO2020052892A1 (fr) 2018-09-10 2020-03-19 Endress+Hauser Flowtec Ag Système d'appareils de mesure et agencement de mesure constitué dudit système

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DE102016117624A1 (de) 2016-09-19 2018-03-22 Endress+Hauser Gmbh+Co. Kg Verfahren zur Verbesserung der Messleistung eines Feldgeräts sowie Feldgerät
DE102017121036A1 (de) * 2017-09-12 2019-03-14 Endress+Hauser SE+Co. KG Feldgerät mit drahtloser Sende-/Empfangseinheit
DE102018112723A1 (de) * 2018-05-28 2019-11-28 Vemcon Gmbh Modulare Messvorrichtung für eine Arbeitsmaschine und System zur Bereitstellung von Messdaten für eine Arbeitsmaschine
DE102019134907A1 (de) * 2019-12-18 2021-06-24 Endress+Hauser Flowtec Ag Elektronik
DE102020112401A1 (de) 2020-05-07 2021-11-11 Vega Grieshaber Kg Sensor und Verfahren zur optischen Anzeige des Ladezustandes eines Sensors

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