WO2000076159A1 - Interface pour la separation de potentiel et pour la transmission de signaux numeriques - Google Patents

Interface pour la separation de potentiel et pour la transmission de signaux numeriques Download PDF

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Publication number
WO2000076159A1
WO2000076159A1 PCT/EP2000/004831 EP0004831W WO0076159A1 WO 2000076159 A1 WO2000076159 A1 WO 2000076159A1 EP 0004831 W EP0004831 W EP 0004831W WO 0076159 A1 WO0076159 A1 WO 0076159A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
interface
voltage
interface according
connection
Prior art date
Application number
PCT/EP2000/004831
Other languages
German (de)
English (en)
Inventor
Wolfram Meyer
Original Assignee
Siemens Audiologische Technik 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 Siemens Audiologische Technik Gmbh filed Critical Siemens Audiologische Technik Gmbh
Publication of WO2000076159A1 publication Critical patent/WO2000076159A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0266—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling

Definitions

  • the invention relates to an interface for electrical isolation and transmission of digital signals with a first side for electrical connection to a first device and a second side for electrical connection with a second device, the first side having at least one signal input and a reference voltage line and the second side at least one Have signal output and a reference voltage line.
  • a non-medical electrical device e.g. PC
  • a medical electrical device creates a medical system.
  • the electrical safety requirements for such systems are specified in the relevant DIN standards (DIN EN 60601-1) and VDE regulations (VDE 0750). These define limit values for maximum permissible earth leakage currents, housing leakage currents and patient leakage currents.
  • Interfaces relevant between the non-medical electrical device and the medical electrical device To transmit a data signal from a non-medical electrical device to a medical electrical device, a suitable signal output of the former is in conductive connection with a signal input of the interface. The data signal is passed through the interface and reaches its signal output, which is in an electrically conductive connection with the input of the second device. Analogously, data can also be transmitted in the opposite direction. According to the valid safety regulations, no low-resistance conductive electrical must be allowed between the two devices Connection exist.
  • the object of the present invention is to simplify and improve interfaces for the transmission of digital signals and for potential isolation between a plurality of devices.
  • This object is achieved with an interface for electrical isolation and transmission of digital signals with a first side for electrical connection to a first device and a second side for electrical connection with a second device, the first side having at least one signal input and a reference voltage line and the second side at least have a signal output and a reference voltage line, solved by the fact that high-voltage-resistant capacitors are used as coupling elements in the signal paths between one signal input and one signal output and between the reference voltage lines on both sides.
  • a signal path of an inventive interface comprises a signal input, a signal output, at least one capacitor (coupling capacitor) as a coupling element and for potential isolation between the signal input and the signal output, and active and / or passive electrotechnical Components between the signal input and the coupling capacitor or between the coupling capacitor and the signal output.
  • capacitors By using fewer, high-voltage-resistant capacitors, a circuit can be implemented easily and inexpensively, which in many cases meets the safety requirements.
  • the capacitors bring about the required potential separation between the side of the non-medical device and the side facing the medical device
  • the required capacitors care must be taken that the sum of their capacitances and the parasitic capacitance present between the two sides of the interface does not exceed a limit value.
  • the dimensioning must be designed for the given network frequency (e.g. 60 Hz). Due to the low mains frequency, only relatively small, low-frequency drain currents are transmitted in the event of a fault via the signal and reference voltage lines of the inventive interface. Thus, with appropriate dimensioning of the capacitors, the safety requirements with regard to dielectric strength and leakage currents between the electrical devices to be connected can generally be met.
  • the frequencies of the digital data signals to be transmitted are significantly above the network frequency. Since the impedance of a capacitor generally decreases with increasing frequency, data signals above a certain minimum frequency can be transmitted in a suitable manner via the capacitors used according to the invention.
  • a major advantage of the interface after the detection is the high data transmission rates that can be achieved with it, which are largely determined only by the components connected upstream or downstream of the coupling capacitors.
  • coupling capacitors are located in the signal paths between a respective signal input and a signal output and between the reference voltage lines on both sides.
  • a reinforcing element is connected upstream of the coupling capacitor.
  • a hysteresis-enhancing element for example a Schmitt trigger. This in turn is connected upstream of a voltage divider in connection with the voltage supply of the relevant side in order to determine the rest potential of the reinforcing element.
  • the voltage divider is dimensioned such that the rest potential m lies approximately in the middle between the lower and the upper trigger threshold of the reinforcement element which is subject to hysteresis.
  • the coupling capacitors in the signal path and between the reference voltage lines form a capacitive voltage divider together with the parasitic capacitance at the input of the amplification element on the signal output side. The following generally applies to this: The greatest voltage drop occurs over the smallest capacitance and vice versa.
  • the signal output connections initially lead to amplification elements with two complementary outputs.
  • these complementary outputs are connected via coupling capacitors to two inputs of a comparator on the associated signal output side of the respective signal path.
  • each comparator is preceded by a voltage divider in connection with the voltage supply of the relevant side of the interface. This sets the input levels of the comparators in the idle state.
  • An interface according to the invention serves in particular to connect non-medical electrical devices with medical electrical devices, to enable data transmission between these devices and at the same time to comply with the required safety regulations.
  • the connection of a programming device with a hearing aid may be mentioned here as an example of a multitude of possible applications. Further advantages and details of the invention result from the following description of an exemplary embodiment with reference to the drawing and in connection with the patent claims.
  • the (first) side of the illustrated interface facing a non-medical device has the following connections: a signal input E1, a signal output A2 and two voltage supply connections VG1 and B1, where B1 represents the reference voltage of the first side of the interface.
  • the (second) side of the interface facing the medical device has a signal output AI, a signal input E2 and two voltage supply connections VG2 and B2, B2 representing the reference voltage of the second side of the interface.
  • a data signal present at signal input E1 is first fed to an inverting amplifying element VI and then passed on via a coupling capacitor C1.
  • the coupling capacitor C1 forms together with a parasitic capacitance CS1 at the input of a Schmitt trigger S1 and a coupling capacitor C2 between the
  • Reference voltage lines a capacitive voltage divider for the input signal.
  • the input signal is largely present at the capacitance CS1. It is detected by the Schmitt trigger S1 and passed on to the signal output AI with the necessary edge steepness.
  • the ohmic voltage divider consisting of two resistors Rl and R2 serves to determine the rest potential at the input of the Schmitt trigger S1. Analogously, data is transmitted in the opposite direction via a signal input E2 and a signal output A2.
  • the high-voltage-resistant coupling capacitors C1, C2 and C3 are dimensioned so that the drain currents through these capacitors are not overshot at the required test voltage and the given mains frequency. The leakage currents through the capacitors must be added together. In addition, an inevitable parasitic capacitance CP between the two sides of the interface is too take into account that this also creates a further leakage current, which must be added to the other leakage currents.
  • the resistors and capacitors shown in the drawing can be dimensioned as follows with a line voltage of 230 V and a line frequency of 50 Hz:
  • the capacitors used have a dielectric strength of up to 4 kV.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

Interface pour la séparation de potentiel et pour la transmission de signaux numériques, qui comporte un premier côté pour la liaison électrique avec un premier appareil et un deuxième côté pour la liaison électrique avec un second appareil. Ladite interface comporte en outre en tant qu'éléments de couplage des condensateurs (C1, C2, C3) résistant aux hautes tensions situés sur les chemins de signaux entre une entrée (E1, E2) donnée de signaux et une sortie (A1, A2) donnée de signaux et entre les lignes de tension de référence (B1, B2) des deux côtés. L'interface selon la présente invention empêche ainsi la transmission de courants de défaut de basse fréquence et permet la transmission de signaux de données de fréquence plus élevée.
PCT/EP2000/004831 1999-06-07 2000-05-26 Interface pour la separation de potentiel et pour la transmission de signaux numeriques WO2000076159A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999125909 DE19925909A1 (de) 1999-06-07 1999-06-07 Schnittstelle zur Potentialtrennung und zur Übertragung digitaler Signale
DE19925909.7 1999-06-07

Publications (1)

Publication Number Publication Date
WO2000076159A1 true WO2000076159A1 (fr) 2000-12-14

Family

ID=7910422

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/004831 WO2000076159A1 (fr) 1999-06-07 2000-05-26 Interface pour la separation de potentiel et pour la transmission de signaux numeriques

Country Status (2)

Country Link
DE (1) DE19925909A1 (fr)
WO (1) WO2000076159A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8063649B2 (en) * 2009-04-03 2011-11-22 Ut-Battelle, Llc Broadband high impedance pickoff circuit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10064257B4 (de) * 2000-12-22 2007-03-29 Siemens Ag Schaltungsanordnung und Verfahren zur Übertragung von Daten
US7732795B2 (en) 2006-01-26 2010-06-08 Vega Grieshaber Kg Circuit arrangement for the electrical isolation of signal lines
DE102006003952A1 (de) * 2006-01-26 2007-08-09 Vega Grieshaber Kg Schaltungsanordnung zum galvanischen Trennen von Signalleitungen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0363609A1 (fr) * 1988-10-13 1990-04-18 Siemens Audiologische Technik GmbH Appareil de programmation digital pour appareils de correction auditive
EP0364700A2 (fr) * 1988-10-18 1990-04-25 ANT Nachrichtentechnik GmbH Circuit de couplage à un bus
WO1994016390A1 (fr) * 1992-12-31 1994-07-21 Apple Computer, Inc. Procede et appareil de transmission de signaux de donnees nrz a travers une barriere isolante disposee dans une interface entre des dispositifs adjacents sur un bus
DE19503106A1 (de) * 1995-02-01 1995-08-17 Joerg Dipl Ing Becker Verfahren und Vorrichtung zur galvanisch entkoppelten breitbandigen Übertragung binärer Signale
US5533053A (en) * 1994-05-16 1996-07-02 Silicon Systems, Inc. Low frequency common mode rejection in a clock circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3638748A1 (de) * 1986-11-13 1988-06-01 Hirschmann Radiotechnik Kapazitives trennglied
AU2150595A (en) * 1995-02-23 1996-09-11 Dolphin Interconnect Solutions As Interface isolator circuit for differential signals
DE19545237A1 (de) * 1995-11-22 1997-05-28 Werner Baudisch Empfangsschaltung für digitale Audiosignale

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0363609A1 (fr) * 1988-10-13 1990-04-18 Siemens Audiologische Technik GmbH Appareil de programmation digital pour appareils de correction auditive
EP0364700A2 (fr) * 1988-10-18 1990-04-25 ANT Nachrichtentechnik GmbH Circuit de couplage à un bus
WO1994016390A1 (fr) * 1992-12-31 1994-07-21 Apple Computer, Inc. Procede et appareil de transmission de signaux de donnees nrz a travers une barriere isolante disposee dans une interface entre des dispositifs adjacents sur un bus
US5533053A (en) * 1994-05-16 1996-07-02 Silicon Systems, Inc. Low frequency common mode rejection in a clock circuit
DE19503106A1 (de) * 1995-02-01 1995-08-17 Joerg Dipl Ing Becker Verfahren und Vorrichtung zur galvanisch entkoppelten breitbandigen Übertragung binärer Signale

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8063649B2 (en) * 2009-04-03 2011-11-22 Ut-Battelle, Llc Broadband high impedance pickoff circuit

Also Published As

Publication number Publication date
DE19925909A1 (de) 2000-12-21

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