EP0371106A1 - Coupleur de transmission a isolation galvanique pour signaux bivalents au moyen d'un transformateur d'impulsions - Google Patents

Coupleur de transmission a isolation galvanique pour signaux bivalents au moyen d'un transformateur d'impulsions

Info

Publication number
EP0371106A1
EP0371106A1 EP89905577A EP89905577A EP0371106A1 EP 0371106 A1 EP0371106 A1 EP 0371106A1 EP 89905577 A EP89905577 A EP 89905577A EP 89905577 A EP89905577 A EP 89905577A EP 0371106 A1 EP0371106 A1 EP 0371106A1
Authority
EP
European Patent Office
Prior art keywords
input
signal
output
coupler
transmitted
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.)
Withdrawn
Application number
EP89905577A
Other languages
German (de)
English (en)
Inventor
Hans Leopold
Gunter Winkler
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.)
Dau GmbH and Co KG
Original Assignee
Dau GmbH and 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 Dau GmbH and Co KG filed Critical Dau GmbH and Co KG
Publication of EP0371106A1 publication Critical patent/EP0371106A1/fr
Withdrawn legal-status Critical Current

Links

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 a coupler for the electrically isolated transmission of a two-value signal by means of a pulse transformer, on the secondary winding of which the transmitted signal can be removed via a bistable memory circuit.
  • couplers galvanically insulated coupling elements which transmit divalent electrical signals from one circuit to another, electrically insulated thereof, as accurately as possible can.
  • couplers galvanically insulated coupling elements
  • a common measure of the static transmission of bivalent signals is the use of opto-couplers.
  • the two states of the electrical variables are represented by the optical states dark and light of a light-emitting diode and transmitted without an electrical connection to a photo transistor which appears to be electrically conductive or blocked in accordance with the optical signal.
  • the asymmetry of these two states or their transitions is obvious and is the reason for many defects in the use of the optocouplers.
  • the transformer coupling which is more favorable from the point of view of temporal symmetry, has the disadvantage that static states cannot be transmitted.
  • the aim of the invention is to avoid this disadvantage to ver ⁇ and vorzu ⁇ a coupler of the type mentioned strike, which is characterized by a simple structure and its conceptually both to achieve a high data transfer rate as well as for applications where only rarely changing states of the two-value input signal must be transmitted is suitable.
  • the circuit connected to the primary winding can be formed by a non-inverting amplifier, preferably a logic buffer or two askading invertors, the input of which may be preceded by a further amplifier, the input and output of the non-inverting amplifier being connected to the primary winding.
  • a non-inverting amplifier preferably a logic buffer or two askading invertors, the input of which may be preceded by a further amplifier, the input and output of the non-inverting amplifier being connected to the primary winding.
  • couplers according to the invention which are essentially for the transmission of input signals with rarely changing logic states, such as those e.g. in the case of door contacts provided by safety-related devices, are provided and in which couplers the transmitted signal can be removed from the secondary winding via a bistable memory circuit, according to a further feature of the invention it can be provided that the one connected to the beginning and the end of the primary winding Circuit has two inputs, at one input an example periodic signal and at the other input of which the signal to be transmitted is present and the two outputs of which assume the same logical state in the idle position and which, depending on the logical level at the input to which the signal to be transmitted is applied, when a signal transition occurs in a specific direction on the e.g. periodic signal applied input supply different potentials.
  • the logic circuit 7 has two D flip-flops 8, 9, the data inputs D of which are connected to one another and can be acted upon by the signal to be transmitted and whose clock inputs are connected to one another and the input to which the periodic signal, for example, is applied, wherein the reset input of one D-flop flop is connected to its inverting output and the set input of the other D-flip-flop is connected to its non-inverting output, and the two remaining outputs of the two D-flip-flops are connected to the primary winding of the pulse transformer.
  • the beginning and the end of the secondary winding are connected to the input and output of a non-inverting amplifier, at which the transmitted signal may be removable via a further amplifier.
  • This output circuit is suitable for both applications. These measures result in positive feedback of the non-inverting amplifier with the secondary winding of the pulse transformer, as a result of which the amplifier can only assume two stable states.
  • the non-inverting amplifier connected to the secondary winding and the amplifier connected to it are each formed by an AND gate, and the two one inputs of the AND gates with one another and with a connection of the secondary winding and the two other inputs of the AND gates vei— are and form a reset input for the secondary side of the coupler, the second connection of the secondary winding being connected to the output of the one AND gate and the transmitted signal being removable from the output of the second AND gate.
  • the turns of the primary winding and the secondary winding of the pulse transformer consist of a flexible, insulating carrier on applied conductor tracks which are connected to form a continuous coil.
  • FIG. 4a and 4b schematically a winding and coil for the pulse transformer of a coupler according to the invention.
  • the coupler according to FIG. 1 is intended for applications in which the changes in state of the input signal occur at short intervals, and for applications in which the time of the changes in state is to be transmitted as precisely as possible.
  • the accuracy in time must be as great as possible, or the transmission speeds for both signal transition directions must be as equal as possible in order to avoid the not to change the transmitted size.
  • the magnetic coupler is therefore also well suited for applications in which the most rapid transmission of a change in state is important (for example in fast logic circuits or for driving power (switching) transistors).
  • the change in the state of the input signal at the input I of the non-inverting amplifier 1 is immediately transmitted to the secondary side of the coupler with a pulse via a pulse transformer 3, 4.
  • a flip-flop is set there, which stores the state of the input signal until the next signal transition.
  • the generation of the assigned in polarity of the direction of change of pulses occurs due to the fact that the change of state has an effect at the input of inverting amplifier sais ⁇ 2 only after a certain running time ⁇ at its output.
  • the connections of the amplifiers 1 and 2 and thus the two connections of the primary winding 3 of the pulse transformer are at different potentials.
  • the polarity of the voltage on the primary winding 3 is determined by the direction of the change in state, the duration of the voltage pulse depends on the transit time of the input signal through the amplifier 2.
  • the flip-flop on the secondary side of the coupler which stores the state of the input signal until the next transmitted pulse, consists of a non-inverting amplifier 5, the input and output of which are connected to the secondary coil 4 of the pulse transformer. If no pulse is transmitted, the amplifier 5 is coupled through the secondary coil of the transformer and therefore only knows two stable states: Either the output voltage and thus the input voltage of the amplifier is equal to its minimum output voltage or the output voltage and thus the input voltage is equal to that Maximum value of the amplifier output voltage.
  • the amplifier 5 is, for example, in the state of output voltage equal to the minimum value of the output voltage ( logic LOW) and a voltage pulse is induced in the secondary coil which increases the input voltage to such an extent that the amplifier increases its output voltage, the amplifier is at a sufficient level Duration of the induced voltage pulse at the end of the pulse in the other stable state (output voltage equal to maximum value of the output voltage, logically HIGH). If a voltage pulse of reversed polarity is now transmitted, the amplifier is again set to the logic LOW state. So the state is up The nrnpiangerseite clearly assigned the direction of the signal transition on the transmitter side.
  • the position of the memory flip-flop is indefinite. This can have a disruptive effect in some applications, for example when driving a power transistor or in control circuits where an incorrect position of an actuator can be caused.
  • This disadvantage can be eliminated if the secondary side of the coupler is designed such that there is an additional input with which the flip-flop can be set to a defined state, regardless of whether the primary side of the coupler is working or not .
  • Such a circuit is shown in Fig.3.
  • the amplifier 5 is formed by an AND gate 12, the output and one of its two inputs of which is connected to the secondary coil 4 of the pulse transformer.
  • the other input of the AND gate 12 serves as a reset input R ⁇ of the flip-flop formed thereby.
  • the output of AND gate 12 is also logic LOW, regardless of whether pulses are induced in the secondary winding of the pulse transformer or not. If the state at input R becomes logic HIGH, flip-flop 12 stores the logic LOW state until a pulse induced in the secondary winding with the appropriate polarity sets the flip-flop into logic HIGH.
  • the amplifier 6 according to FIG. 1 here also consists of an AND gate 13 and takes the signal to be transmitted from the input of the flip-flop 12 for reasons of the shortest possible transit time. The other input of the AND gate 13 is at the reset input R * connected. This is done in the interest of the shortest possible transit time of the reset signal from input R to output 0.
  • the flip-flop on the secondary side changes its state in accordance with the state of the signal at input D at the next significant signal transition at input C p on the primary side of the coupler If the flip-flop on the secondary side of the coupler does not reflect the actual state of the input signal due to a fault (eg the "supply voltage), this incorrect state only lasts until the next significant signal transition at input C p . In the previously described coupler according to FIG the wrong state remains until the next state change of the signal to be transmitted.
  • a fault eg the "supply voltage
  • FIG. 3 shows an example of the implementation of the logic circuit 7 according to FIG. 2 using two D flip-flops 8, 9.
  • the inputs D of the two D flip-flops are connected to one another.
  • the inputs C p are also connected to one another. If the input is now in the logic LOW state and there is a signal transition in a specific direction at the input C 1, nothing will change in the state of the outputs of the D flip-flop 8 (logic LOW, Q * logic HIGH). However, the state of the outputs of the D flip-flop 9 changes: the output Q becomes logic HIGH, the output Q becomes logic LOW.
  • the D flip-flop 9 since the Q output of the D- ⁇ i ⁇ n ⁇ pb 9 with the set input ⁇ ⁇ (active LOW) whose ⁇ flip-flop is connected, the D flip-flop 9 resets itself to the output Q logic LOW or output Q logic HIGH.
  • the duration for which the output " Q of the D flip-flop 9 is logically HIGH depends on the time from the change in the state at the output Q from logically HIGH to logically LOW until the outputs Q " or Q are reset ⁇ crosses. For this time, the ends of the primary winding 3 of the pulse transformer are at different potentials (output Q FF 8 logic LOW, output Q FF 9 logic HIGH).
  • a winding according to FIG. 4 can be used, which consists of a flexible carrier 15 arranged conductor tracks 14 is made, which are arranged so that they are connected to a continuous coil after wrapping the transformer core 16.
  • 4a shows the flexible carrier 15 made of insulating film in the stretched state and in FIG. 4b after the core 16 has been wrapped around it.

Abstract

Un coupleur permet de transmettre indépendamment du potentiel des signaux bivalents au moyen d'un transformateur d'impulsions, les signaux transmis étant captés par un circuit bistable de mémorisation auprès de l'enroulement secondaire du transformateur d'impulsions. Le début et la fin de l'enroulement primaire (3) du transformateur d'impulsions sont reliés à divers raccords d'un circuit (1, 2; 7) et fournissent à ces raccords des potentiels au moins temporairement différents en fonction des signaux reçus à leur entrée.
EP89905577A 1988-06-03 1989-05-24 Coupleur de transmission a isolation galvanique pour signaux bivalents au moyen d'un transformateur d'impulsions Withdrawn EP0371106A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT145288A AT391959B (de) 1988-06-03 1988-06-03 Koppler zur potentialgetrennten uebertragung eines zweiwertigen signales mittels eines impulstransformators
AT1452/88 1988-06-03

Publications (1)

Publication Number Publication Date
EP0371106A1 true EP0371106A1 (fr) 1990-06-06

Family

ID=3514206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89905577A Withdrawn EP0371106A1 (fr) 1988-06-03 1989-05-24 Coupleur de transmission a isolation galvanique pour signaux bivalents au moyen d'un transformateur d'impulsions

Country Status (3)

Country Link
EP (1) EP0371106A1 (fr)
AT (1) AT391959B (fr)
WO (1) WO1989012366A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6853685B1 (en) 1998-07-17 2005-02-08 Stephan Konrad Circuit arrangement for the electrically isolated transfer of digital signals
ES2331214T3 (es) 1998-07-17 2009-12-23 Endress + Hauser Wetzer Gmbh + Co. Kg Disposicion de circuito para la transmision galvanicamente separada de señales digitales.
DE10262239B4 (de) 2002-09-18 2011-04-28 Infineon Technologies Ag Digitales Signalübertragungsverfahren
US20080001700A1 (en) * 2006-06-30 2008-01-03 Flavio Pardo High inductance, out-of-plane inductors

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3210509A1 (de) * 1982-03-23 1982-12-09 Gerd Dr.-Ing. 3167 Burgdorf Harms Schnelle elektronische koppeleinrichtung zur potentialfreien uebertragung digitaler elektrischer steuersignale
US4799119A (en) * 1986-09-10 1989-01-17 International Business Machines Corporation Flexible circuit magnetic core winding for a core member

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8912366A1 *

Also Published As

Publication number Publication date
AT391959B (de) 1990-12-27
ATA145288A (de) 1990-06-15
WO1989012366A1 (fr) 1989-12-14

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