EP1692762A1 - Inductance de decouplage electronique destinee a etre utilisee dans des reseaux de type interface actionneur-capteur - Google Patents

Inductance de decouplage electronique destinee a etre utilisee dans des reseaux de type interface actionneur-capteur

Info

Publication number
EP1692762A1
EP1692762A1 EP04802872A EP04802872A EP1692762A1 EP 1692762 A1 EP1692762 A1 EP 1692762A1 EP 04802872 A EP04802872 A EP 04802872A EP 04802872 A EP04802872 A EP 04802872A EP 1692762 A1 EP1692762 A1 EP 1692762A1
Authority
EP
European Patent Office
Prior art keywords
interface
electronic decoupling
decoupling inductance
electronic
transistor
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.)
Ceased
Application number
EP04802872A
Other languages
German (de)
English (en)
Inventor
Michael Georgi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IDT Europe GmbH
Original Assignee
Zentrum Mikroelektronik Dresden GmbH
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 Zentrum Mikroelektronik Dresden GmbH filed Critical Zentrum Mikroelektronik Dresden GmbH
Publication of EP1692762A1 publication Critical patent/EP1692762A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/40—Impedance converters
    • H03H11/42—Gyrators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/46—One-port networks
    • H03H11/48—One-port networks simulating reactances
    • H03H11/50—One-port networks simulating reactances using gyrators

Definitions

  • the invention relates to an electronic decoupling inductance for applications in actuator sensor interface networks, such as slaves, masters, extenders, repeaters, monitors and all modules connected to the actuator sensor interface, hereinafter referred to as applications.
  • actuator sensor interface networks such as slaves, masters, extenders, repeaters, monitors and all modules connected to the actuator sensor interface, hereinafter referred to as applications.
  • the actuator sensor interface is a networking system for the lowest fieldbus level of automation technology with predominantly bit-oriented data exchange according to the master-slave principle. It is particularly suitable for simple and inexpensive "low end" installation of simple binary sensors and actuators as well as modules with multiple inputs / outputs and their operation and maintenance via a controller. Sensors are typically simple command transmitters, pressure switches, selector switches, proximity switches, Level sensors, light barriers or incremental angle encoders. As simple actuators, preferably indicator lights, acoustic signal transmitters, pneumatic valves, hydraulic valves and small electrical drives are considered.
  • An AS-Interface slave IC is either built directly into a sensor or actuator, or he is built into a module to which conventional sensors and actuators can be connected.
  • the AS-Interface e master forms the interface between the transmission system and a controller on a higher-level system
  • Control level for example a programmable logic controller (PLC) or a personal computer (PC) or a higher-level network structure and organizes data traffic on the AS-Interface bus. It can be part of the control. The slaves then exchange data directly with the controller.
  • PLC programmable logic controller
  • PC personal computer
  • AS-Interface A conventional wiring solution can be completely replaced by the AS-Interface system, which saves wiring effort and, with intelligent AS-Interface sensors and AS-Interface actuators, new functions such as parameterization and diagnostics can also be implemented without the wiring effort increase. Analog devices can also be connected using special profiles. Because of these properties, the AS-Interface has developed into the leading networking system in the lowest field level of automation technology in recent years. Since 1999 AS-Interface has been an international industry standard IEC 62026 and a European standard EN 50295.
  • the bus cable In addition to the transmission of data, the bus cable, typically an unshielded two-wire flat cable, has the task of supplying the participants with electrical energy from a power supply unit that usually provides 30V DC voltage with up to 8A.
  • the data signals are modulated onto the DC voltage with an amplitude of maximum +/- 4V using a special method for serial transmission, alternating pulse modulation (APM), in the form of positive and negative sin 2 pulses and are transmitted in the form of data telegrams.
  • APM alternating pulse modulation
  • data and energy must be decoupled from one another in an AS-Interface.
  • AS-Interface data decoupling networks are used, which are usually housed in the same housing as the applications connected to the AS-Interface network.
  • Two inductors and two resistors connected in parallel which are usually housed in the housing of the power supply, are used to generate the voltage pulses.
  • the inductors in the power supply convert the current pulses generated by the AS-Interface transmitters into voltage pulses and at the same time prevent the AS-Interface cable from being short-circuited by the power supply for data transmission.
  • an AS-Interface coupling module for connecting sensors and actuators without their own slave IC to the AS-Interface network or in other applications, data signals and operating voltage must be decoupled from each other. In addition, care must be taken to ensure that sudden changes in current on the application side, due to the switching of actuators, do not lead to increased voltage pulses on the AS-Interface and influence the network in an undefined manner. This decoupling is realized by an inductor. Two versions are known for this:
  • the former variant is implemented, for example, in the applicant's IC A 2 SI.
  • the electronic decoupling inductance integrated in the IC consists of a highly complex circuit using several operational amplifiers, each of which contains several transistors. It therefore has a space requirement that should not be underestimated, which influences the price of the IC and can provide a maximum of 30mA. Due to the silicon internal structure, each of the transistors has reference points to the substrate and thus to the ground, which in use can cause asymmetries of the module on the AS-I-BUS, which have negative effects on the BURST behavior.
  • the applicant realizes the latter variant, inter alia, when externally wiring its IC ASI-SW.
  • the object of the invention is to provide a wound decoupling inductance in an AS-Interface application by an inexpensive and space-saving solution for a decoupling inductance which is electronically simulated from a few electronic standard components while observing the parameters specified by the AS-International Association in the AS-Interface specification replace. Every manufacturer should always have their AS-Interface applications checked and certified for conformity to the AS-Interface specification. The impedance of an AS-Interface in a given
  • Frequency range from 50 kHz to 300 kHz is an important variable, which is largely determined by the decoupling inductance. Other goals are to provide the application with currents above 30mA and to avoid asymmetries of the module on the AS-I-BUS.
  • the electronic decoupling inductance is independent of the AS-Interface IC, this remains inexpensive to manufacture. In this case, the power loss arising in the decoupling inductance does not have to be dissipated via the IC housing either, which allows the use of inexpensive housing types.
  • the electronic decoupling inductance can in turn be produced more cost-effectively than one wound decoupling inductance. It also takes up less installation space and can be placed more flexibly in an AS-Interface application or an AS-Interface coupling module. It can be made discrete, hybrid or fully integrated, but it is always a separate module from the AS-Interface IC.
  • a gyrator is a particularly advantageous circuit unit for impedance conversion. It can be used to simulate a filter coil (wound inductance) using simple electronic means by converting a capacitive terminating resistor into a synthetic inductive input resistor. For this purpose, it comprises at least one active electronic component, such as a transistor or operational amplifier, a capacitor and wiring resistors. Gyrators can be manufactured both discretely and hybrid or in the form of an integrated circuit more cheaply, smaller and less mechanically sensitive than wound inductors. A particularly simple two-pole gyrator circuit is in P. Strict: Gyrator acts as electronic choke; Electronics World + Wireless World magazine September 1993 page 754.
  • Fig 1 maps the AS-Interface level in a network
  • Fig. 2 shows schematically an AS-Interface slave IC with circuitry.
  • the master 1 shows the integration of the AS-Interface in a higher-level network.
  • the master 1 can be part of a control (not shown in detail) on the control level and can be supplied, for example, via the Interbus 2.
  • the slaves 3.1, 3.2 ... 3.n on the AS-Interface level then exchange data directly with the controller.
  • On Power supply 4 feeds the network from the AC network with 30V DC. Two inductors and two resistors connected in parallel are used to generate the voltage pulses.
  • the slave 3.n contains, for example, a signal lamp as an actuator and / or a key switch as a sensor. Both are connected to the + connection of the AS-Interface bus via a decoupling inductance 5 of 18mH, for example.
  • the decoupling inductor 5 decouples the data stream from the energy and prevents the transmission of switch-on voltage peaks to the AS-Interface bus when an actuator is activated.
  • a maximum of 31 (62) slaves can be connected to one master.
  • FIG. 2 the circuit board of an AS-Interface slave is shown by way of example, only the components that are most important for understanding the invention are shown in terms of circuitry.
  • a highly integrated circuit AS-Interface slave IC "AS-I IC" is placed on a circuit board.
  • It contains a logic 6 for the management of all incoming and outgoing data, an address memory (not shown), a power supply 7 for the logic 6, and one Oscillator circuit 8, to whose input ports 0SC1, OSC2 a quartz crystal is connected as a frequency-determining element, a data receiver 9, a data transmitter 10, two output ports D00, D01 for actuator signals, for example for an LED illuminated pushbutton, two input ports D12, D13 for sensor signals, for example for Monitoring of the switching status of the LED illuminated pushbutton, an output port LED for displaying communication states, an input port FID for the detection of peripheral faults, two ports Test 1, Test 2 for test purposes as well as an input circuit that limits the voltage via a Z-diode to suppress high-voltage interference pulses via the ports ASIP (for line AS-I +) and ASIN (for line AS-I -) from the AS-I bus below A polarity reversal protection diode is supplied.
  • the port CAP is used for a capacitive connection of the AS-I IC, not shown in detail. Furthermore, communication with the master 1 takes place via the AS-I bus.
  • the circuit board is advantageously built directly into a conventional LED illuminated pushbutton, which is why it should be as small as possible.
  • the decoupling inductance 5 of the input power supply for decoupling the data signals from the operating voltage and decoupling sudden changes in current on the actuator / sensor side of the AS-I bus should therefore also have the smallest possible spatial dimensions with regard to its base area and height and also be inexpensive to manufacture.
  • the decoupling inductance 5 is drawn out again as a wound coil according to the prior art in FIG. 2a).
  • the wound coil from FIG. 2a is replaced according to the invention by an impedance converter “gyrator” 11, which electronically simulates the inductance of the wound coil.
  • an impedance converter “gyrator” which electronically simulates the inductance of the wound coil.
  • a particularly simple and inexpensive electronic impedance converter “gyrator” has been used e.g. by P. Strict in
  • the two-pole gyrator circuit behaves like a decoupling inductance, in that the base voltage at the current-controlling transistor also changes only slowly according to the characteristic curve of the emitter-base capacitor, which charges only slowly when current flows, and consequently the current flow from terminal P1 to terminal P2 also changes of the "gyrator" 11 can only change slowly over the collector-emitter path of the transistor.
  • a voltage divider formed from a collector-base resistor and a base-emitter resistor, the operating point of the transistor is determined.
  • the “gyrator” 11 blocks the data signals and in this way decouples them from the operating voltage, on which the data signals on the AS-I bus with a center frequency of 167 kHz are superimposed in a relatively narrow band by the RC constant of the base-emitter resistor and the capacitor for the data signals represents a very large resistance.
  • the electronic decoupling inductance "Gyrator” 11 since it is built up separately from the miniaturized AS-Interface slave IC, can be designed for higher currents than 30mA. This has the advantage that slaves can also be operated without an additional supply cable or wound decoupling inductance whose current consumption is above 30mA, for example valves or switches with a current consumption of 50mA or more. This is particularly the case when the electronic decoupling inductance "gyro" 11 is constructed discretely or hybrid. In addition, such an electronic decoupling inductance “gyrator” 11 can also be used in coupling modules which supply several sensors and actuators without their own slave IC. An example of a cost comparison should make clear the cost advantages of a discrete electronic decoupling inductance compared to a wound coil:
  • wound coil electronic decoupling inductance (gyrator) component costs approx. 0.50 to 0.60 € approx. 0.05 to 0.08 € assembly costs approx. 0.07 € approx. 0.15 €
  • the overall height of a discrete electronic decoupling inductance remains approximately 1.5 mm below the overall height of a wound coil of approximately 5 to 7 mm.
  • an electronic decoupling inductance in the case of a discrete electronic decoupling inductance, the individual components can be arranged on a printed circuit board much more flexibly than is the case with a wound coil.
  • an electronic decoupling inductance is characterized by a higher reliability in terms of mechanical vibrations compared to a wound coil when used in harsh environmental conditions.
  • the invention is not only used in a slave, but advantageously also in other applications, such as a master, an extender, a repeater, a monitor and others.

Landscapes

  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

L'invention concerne une inductance de découplage électronique destinée à être utilisée dans des réseaux de type interface actionneur-capteur. Cette invention est caractérisée en ce que l'inductance de découplage électronique est une unité fonctionnelle qui est indépendante du circuit intégré IC de l'interface actionneur-capteur (AS-I IC), est configurée sous la forme d'un circuit girateur bipolaire sans liaison avec la masse, et comprend un transistor à base commandée, un condensateur présentant une résistance de charge pour influer sur l'augmentation de courant par l'intermédiaire du transistor lorsque le courant circule, un diviseur de tension pour le réglage des points de fonctionnement du transistor, et une constante RC adéquate de la résistance d'émetteur de base et du condensateur, pour bloquer les signaux de données haute fréquence ainsi que la propagation de variations de courant dans le bus d'interface AS (AS-I bus). L'inductance de découplage électronique selon l'invention remplace directement une bobine d'inductance.
EP04802872A 2003-12-05 2004-12-03 Inductance de decouplage electronique destinee a etre utilisee dans des reseaux de type interface actionneur-capteur Ceased EP1692762A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10357332A DE10357332A1 (de) 2003-12-05 2003-12-05 Elektronische Entkoppelinduktivität für Anwendungen in Aktuator-Sensor-Interface Netzwerken
PCT/DE2004/002664 WO2005057783A1 (fr) 2003-12-05 2004-12-03 Inductance de decouplage electronique destinee a etre utilisee dans des reseaux de type interface actionneur-capteur

Publications (1)

Publication Number Publication Date
EP1692762A1 true EP1692762A1 (fr) 2006-08-23

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EP04802872A Ceased EP1692762A1 (fr) 2003-12-05 2004-12-03 Inductance de decouplage electronique destinee a etre utilisee dans des reseaux de type interface actionneur-capteur

Country Status (3)

Country Link
EP (1) EP1692762A1 (fr)
DE (1) DE10357332A1 (fr)
WO (1) WO2005057783A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502007004246D1 (de) * 2007-02-27 2010-08-12 Siemens Ag ASI-Netzwerk für explosionsgefährdete Bereiche
DE102014008990B4 (de) 2014-06-13 2016-11-10 Dietmar Dreyer Halbleiterverstärker zur Speicherung von elektrischer Energie auf der Basis eines generierten Schwingkreises
DE102015221880A1 (de) 2015-11-06 2017-05-11 Ifm Electronic Gmbh Slave-Modul für einen symmetrischen erdfreien Feldbus der Automatisierungstechnik zur Verbindung mit einer externen analogen erdfreien E/A-Einheit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592069A (en) * 1983-02-10 1986-05-27 Redding Robert James Line powered modem

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4592069A (en) * 1983-02-10 1986-05-27 Redding Robert James Line powered modem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2005057783A1 *

Also Published As

Publication number Publication date
DE10357332A1 (de) 2005-08-25
WO2005057783A1 (fr) 2005-06-23

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