WO1989012366A1 - Coupler for separated-potential transmission of a two-valued signal by means of a pulse transformer - Google Patents

Coupler for separated-potential transmission of a two-valued signal by means of a pulse transformer Download PDF

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Publication number
WO1989012366A1
WO1989012366A1 PCT/AT1989/000052 AT8900052W WO8912366A1 WO 1989012366 A1 WO1989012366 A1 WO 1989012366A1 AT 8900052 W AT8900052 W AT 8900052W WO 8912366 A1 WO8912366 A1 WO 8912366A1
Authority
WO
WIPO (PCT)
Prior art keywords
input
signal
connected
coupler
output
Prior art date
Application number
PCT/AT1989/000052
Other languages
German (de)
French (fr)
Inventor
Hans Leopold
Gunter Winkler
Original Assignee
Dau Gesellschaft M.B.H. & 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
Priority to ATA1452/88 priority Critical
Priority to AT145288A priority patent/AT391959B/en
Application filed by Dau Gesellschaft M.B.H. & Co. Kg. filed Critical Dau Gesellschaft M.B.H. & Co. Kg.
Publication of WO1989012366A1 publication Critical patent/WO1989012366A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; Arrangements for supplying electrical power along data transmission lines
    • H04L25/0264Arrangements for coupling to transmission lines
    • H04L25/0266Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling

Abstract

In a coupler for separated-potential transmission of a two-valued signal by means of a pulse transformer, at the secondary winding of which the transmitted signal can be fed to a bistable storage circuit, the beginning and the end of the primary winding (3) of the pulse transformer are connected to various terminals of a circuit (1, 2; 7) which supplies to the latter, in function of incoming signals at these terminals, potentials which differ, at least briefly.

Description

Coupler for electrically isolated transmission of a bivalent signal by means of a pulse transformer I

The invention relates to a coupler for electrically isolated transmission of a bivalent signal by means of a pulse transformer to the secondary winding of the transmitted signal over a bistable memory circuit is removable.

Out of the endeavor electrical information systems any interference to make against the electromagnetic interference, there is a need for galvanically isolated Koppel¬ elements (hereinafter referred to as couplers), the divalent elek¬ trical signals are transmitted at the correct time as possible from one circuit to another, which is electrically insulated can. In this case, should be allowed, without thereby occurs a distortion of the transmitted signal über¬ large potential differences and the temporal change rates between the two circuits. It seems important that - play correctly in spite of the potential¬ separate transmission and the static states of the signal - in Gegen¬ kit for coupling with a simple transformer.

A common measure of the static transmission of signals is divalent couplers in the use of Opto¬. The two states of the electrical variables are here represented by a light emitting diode, the optical states of dark and light and transmitted without any electrical connection to a photo transistor which appears electrically conductive in correspondence to the optical signal or blocked. The asymmetry of these two states and their transitions is obvious and is the cause of many shortcomings in Ein¬ set the optocoupler. The more favorable from the viewpoint of temporal symmetry transformer coupling has in part the Nach¬ that static states can not be transferred. This disadvantage can be avoided if in a magne¬ tables thus transformer coupled (as opposed to optical thus electromagnetically coupled) coupler on the primary side pulses at the time of changes in state of the input signal in the direction of the transition corresponds sprecnenαen polarity are generated, these pulses be transferred αurcn a transformer and put a flip-flop on the Sekundär¬ page which stores the state until the next pulse. Examples of such couplers can be found in "Pulse Transformers" from MA Nadkarni and S. Ramesh Bhat, Tata McGraw-Hill, New Delhi, 1985, or in the Lecture Notes electronics 1 by H. Leopold Institute of Electronics at the Technical University of Graz ., 1985

In these known solutions, the disadvantage of relatively high circuit complexity arises mostly.

The aim of the invention is to propose this disadvantage to ver ¬ avoid and vorzu¬ a coupler of the type mentioned, 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 is to be transferred changing states of divalent transition Ein¬ signal suitable.

This is according to the invention achieved in that the beginning and the end of the primary winding of the Impuls¬ transformer are connected to different terminals of a circuit that provides at least on these in dependence on incoming on its input signals at these ports briefly different Potententiale.

By these measures it is possible to transmit signals from one circuit to the other, wherein the Aus¬ gear of the coupler in the logic state remains ver¬ until a further signal at the input of the coupler thereof is received.

According to a further feature of the invention may be vor¬ seen that the Schal¬ connected to the primary winding processing by a non-inverting amplifier, preferably a logical buffer askadierende or two invertors is formed ge, the input of a further Ver¬ optionally more upstream, wherein the input and output of the inverting amplifier to the primary winding ver¬ prevented.

In this embodiment, occur only during a be¬ by the running time of the signals by the amplifier-related period varying potentials at the An¬-circuits the primary winding of the coupler. This period reicnt Aoer made to transfer at the input of the coupler signal present. Another advantage of this form Ausführungs¬ also that the timing of the state change of the logical state at the input of the coupler with very high accuracy on the secondary winding, and the output of the coupler is transferred is located. In addition, the signals can be transferred mi a very high frequency, which results in a high data transfer rate.

In applications where, for example, analog signals are to be über¬ wear, the amount of which is encoded by time or the duty cycle, it is desirable in the transmission time deviations, or deviations in the Über¬ transmission speed to avoid possible for both signal transition directions, with the inventive solution is possible in a much more far-alia extent than with the usually used for such purposes optocouplers.

In the inventive couplers are seen essentially for the transmission of input signals with seldom changing logic states, as they are given, for example, when the door contacts of safety equipment, vorge and in which couplers the transmitted signal from the secondary winding via a bistable memory circuit is detachably may be provided according to a further feature of the invention is that the circuit connected to the beginning and the end of the primary winding has two inputs, to one input of which an example, periodic signal and at the other input of which the signal to be transmitted and whose two outputs in assume the same logic state of the rest position and the supply depending on the logical level of the signal to be transmitted with the applied input signal upon occurrence of a transition of certain direction at the periodic signal applied to the input, for example, different potentials.

Through these measures, a great deal of Sicher¬ uniform ensures that the static state of the transmitted signal for a long time will surely maintained. Here, the static condition of the transmitted signal, for example, can also be maintained for months or years, whereby also a very high degree of noise immunity is provided. In this connection it can be provided that the logic circuit 7 has two D-type flip-flop 8, 9, whose data inputs connected to D to each other and can be acted upon by the signal to be transmitted and whose clock inputs are connected together and acted upon by, for example, periodic signal input, wherein the reset input of a D-flop flops is connected to the inverting output and the set input of the other D flip-flop with its non-inverting output and the remaining two outputs of the two D flip-flops are connected to the primary winding of the pulse transformer.

By these measures, a very simple circuit technology construction. The transfer of a change in the input signal to be transmitted takes place immediately after a change but in this event, following significant change in eg periodic signal. Furthermore, also the advantage that, when the logical state of the output of the coupler should change due to a fault, this periodic at the next change of the example signal of the output of the coupler again logic in particular by the last transmitted input signal results in this solution state returns. This is also a very high security of the logic state of the output of the coupler is secured.

According to a further feature of the invention may be seen vorge that the beginning and the end of the secondary winding is connected to the input and output of non-inverting amplifier in which the transmitted signal is detachable optionally via a further amplifier.

This output circuit is desinged for both applications. So a Mit¬ results from these measures coupling the non-inverting amplifier with the Sekundär¬ development of the pulse transformer, causing the amplifier can only have two stable states.

It can further be provided that the connected to the secondary winding non-inverting amplifier and is connected to this amplifier are each formed by an AND gate, and the two one inputs of the AND gates together and to a terminal of the secondary winding and the other two inputs of the aND gates vei- uunuen each other and form a reset input for the secondary side of the coupler, wherein the second terminal of the Sekundär¬ winding is connected to the output of an aND gate and arn output of the second aND gate, the transmitted signal is removable.

These measures enable the output of the coupler when applied to the supply voltage in a defined logic state to bring.

A production-technically simple manufacture of the coupler of the present invention to enable it is advantageous if the turns of the primary winding and the secondary winding of the pulse transformer of on a flexible, insulating support insist on ebrachten conductor tracks which are connected to form a continuous coil.

In this way, the still relatively auf¬ agile winding of the coils is not necessary on a toroidal core.

The invention will now be explained er¬ reference to the drawings. They show:

Fig. 1 to 3 schematically coupler according to the invention, and

FIGS. 4a and 4b schematically a winding and coil for the pulse transformer of a coupler according to the invention.

The coupler according to Fig.l is intended for applications in which the changes of state of the signal Eingangs¬ effected in short intervals, as well as for applications in which the timing of the changes of state to be transmitted as closely as possible. When transmitting digital data, it is desirable to make the maximum transmittable frequency of state changes as large as possible in order to achieve a high data transfer rate. In applications where, for example, analog signals are to be transmitted, the amount of which is encoded by the time or duty cycle, the accuracy in time must be as large as possible, or the transmission rates for both directions Signalübergangs¬ be as equal as possible in order to not to change transmitting size. Therefore, the magnetic coupler is also well suited for applications which require the fastest possible transmission of a change of state (to the game Bei¬ in fast logic circuits or to drive power (switching) transistors). When coupler according to Fig.l the change of state of the input signal at the input I of the nichtin¬-inverting amplifier 1 is immediately transmitted to a pulse on a pulse transformer 3.4 to the secondary side of the coupler. There, a flip-flop is set 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 nicht¬ 2 only after a certain running time ¬ at its output. are the connections of the amplifiers 1 and 2 and thus the two terminals of the primary winding 3 of the pulse transformer at different potentials for this delay of the signal through the amplifier. 2 The polarity of the voltage across the primary winding 3 is determined by the direction of the state change, the duration of the voltage pulse depends on the duration of the transition signal Ein¬ by the amplifier 2 from.

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 Ver¬ more 5 whose input and output are connected to the secondary coil 4 of the pulse transformer. If no pulse is transmitted, the amplifier 5 is fed back through the secondary coil of the transformer and therefore has only two stable states: either the output voltage and the input voltage of the amplifier is equal to output voltage of its minimum output voltage or the output voltage, and thus the Ein¬ equal to the maximum value of the output voltage of the amplifier. The amplifier 5 is, for example, in the state the output voltage is equal to the minimum value of the output spannüng (logic LOW) and inducing a voltage pulse in the secondary coil, the increased so the input voltage that the amplifier increases its output voltage, so the amplifier is at a sufficient duration of the induced voltage pulse at the end of the pulse (equal to the maximum value Aus¬ goose voltage output voltage, logic HIGH) in the other stable state. Now, a voltage pulse transmitted um¬ introverted polarity, the amplifier is reset LOW level in the state. Thus, the state is the direction of the signal transition assigned to αer nrnpiangerseite clearly on the transmitter side.

Immediately after turning on the power supply at the secondary side of the coupler, the location of the storage flip-flop is uncertain. This may have a disturbing effect in some applications, such as when driving a power transistor or control circuits, where it may cause a wrong position of an actuator. This disadvantage can be eliminated if the Sekundärsei e of the coupler is formed so that an additional input is provided to the flip-flop stand in a defined Zu¬ can be set, regardless of whether the Primär¬ working side of the coupler or not , Such a circuit is shown in Fig.3. The amplifier 5 is formed in this guide die Aus¬ by an AND gate 12 whose output and one of its two inputs is connected with the secondary coil 4 of the pulse transformer. The other input of the AND gate 12 serves as a return-set input R of the ~ ge thereby forming flip-flops. If the input signal R is a logic LOW, the output of the AND gate 12 is likewise a logical LOW, regardless of whether pulses are induced in the secondary winding of the pulse transformer or not. Is the state at the input R of a logical HIGH, the flip-flop 12 stores the status of logical LOW until an induced in the secondary winding with the appropriate polarity pulse sets flip-flop in the state of logical HIGH. The amplifier 6 after Fig.l is here also made of an AND gate 13 and takes the signal to be transmitted, for reasons of a small running time from the input of the flip-flop 12. The other input of the AND gate 13 is connected to the back-set input R * connected. This is done in the interest of a short running time of the reset signal from Ein¬ gear R to the output 0th

For applications where it is required that rarely changing states of the two-valued input signal rich¬ be transferred tig (for example, the state of Türkon¬ takts in a safety-related device), so it does not matter, the status change as quickly as possible, but carry the static state of the signal as safe as possible for a long time (perhaps days or years) of time to exceed, a coupler has been provided in accordance with Fig.2. Here, not the generation of associated in polarity to the state of the input signal D pulses transmitted by the pulse transformer 3.4 causes the change of state of the signal to be transmitted on the D input, but a signal transition certain direction at the input C. Therefore, a transfer of the state of the input signal is in contrast to the previously described possible couplers, even if this does not change over a longer period. The state of the signal changes at input D, this change is in contrast to the previously described coupler immediately, only transmitted during the next following significant signal transition at input C Σ but. Is applied a periodic signal to the input C p, the Zu¬ is state of the signal at the input D periodically carry über¬. If the status of the signal at the input D thereby un¬ changed, so also the state of the salivary flip-flop 5 on the secondary side does not change. Changes the Zu¬ stand at input D, then the flip-flop change on the Sekundäi- page at the next succeeding significant Signal¬ transition at input C p at the primary side of the coupler state corresponding to the state of the signal at the input D. When the flip-flop on the secondary side of the coupler by a disturbance (for example, the "supply voltage) does not reflect the tat¬ extraneous state of the input signal, so this false state continues only until the next significant signal transition at the input C p. When the previously described coupler according to Fig.l remains the wrong state lasts until the next state transition of the signal to be transmitted.

In Figure 3 an example for the realization of the logic circuit 7 according to Figure 2 using two D flip-flops 8,9 is shown. The D inputs of the two D flip-flops are connected together. Likewise, the inputs C p are interconnected. Now the input in Zu¬ is standing LOW and at the entrance C "signal transition certain direction takes place, so the D flip-flop 8 is at the state of Aus¬ not change gears (LOW, Q * HIGH level). However, the state of the outputs of the D flip-flop 9 changes: The output Q is a logic HIGH, the Aus¬ gear Q is LOW. However, since the output Q of the D πiμnυpb 9 to the set input § ~ (active LOW) desseiDen υ- flip-flop is connected to sets the D flip-flop 9 itself again in the state of logical LOW output Q or output Q HIGH level back. The duration for which the output "Q of the D flip-flop 9 is a logic HIGH, depends on the time of the state at the Q output of the change from logic HIGH to logic LOW until resetting the outputs Q" and Q ver ¬ strokes. For this time the ends of the primary winding 3 of the Impustransformators are at different potentials (Q output of FF 8 logic LOW, output Q of FF 9 logical HIGH).

Is the time of the significant signal transition at the input C p of the input D logical HIGH, the state of the outputs of the D flip-flop 9 does not change and the output Q of the D flip-flop 8 will become momentarily logic HIGH (for Zeit¬ duration until the D flip-flop 8 itself again in the state logic LOW output Q or output ÖT logic HIGH zurück¬ sets). It is therefore the primary winding of the pulse transformer 3 again a short voltage pulse, but with opposite polarity umge¬. The voltage pulses located at the primary winding of the pulse transformer 3 are clearly assigned to their polarity, that is, the state of the signal on the D input.

The use of very fast logic circuits in silicon gate CMOS technology allows the Windungs¬ pay the coil 3.4 to make very small. Toroidal cores of ferrite with 6 mm diameter and Inverterlaufzei of about 3 ns result of turns of each 4. To avoid the costly winding a toroidal transformer, a Wick¬ lung can be used according to the Figure 4, consisting of a flexible backing 15 conductor tracks arranged is produced 14, which are arranged so that they are connected to the embrace of the transformer core 16 to form a continuous coil. In Fig. 4a the flexible carrier 15 is shown from insulating foil in the stretched state and in Figure 4b after the wrapping of the core 16.

Claims

Ü patent claims CHE
1. Coupler for electrically isolated transmission of a bivalent signal by means of a pulse transformer to the secondary winding of the transmitted signal over a bistable memory circuit is removable, characterized in that the beginning and the end of the primary winding (3) of the pulse transformer with various An¬ circuits a circuit (1, 2; 7) are connected, which supplies to this, depending on the incoming signals at its input at least briefly different Potententiale.
2. A coupler according to claim 1, characterized in that associated with the primary winding (3) connected circuit is formed by a non-inverting amplifier (2), preferably a logical buffer or two cascaded invertors, the input of which is optionally preceded by a further amplifier (1) wherein the input and the output of nich¬ tinvertierenden amplifier (2) with the primary winding (3) are connected.
Includes 3. A coupler according to claim 1, characterized in that with the beginning and the end of the primary winding (3) connected to the circuit (7) has two inputs, at the one input (C p) a, for example, periodic signal, and (at the other input D) abuts the signal to be transmitted and whose two outputs IO, 0_) in the rest position occupy the same logical state and depending on the logical level at acted upon by the signal to be transmitted input (D) upon the occurrence of a signal transition certain direction at the deliver a short time, for example, different potentials applied periodic signal input (C p).
4. A coupler according to claim 3, characterized in that the logic circuit (7) comprises two D flip-flops (8, 9) whose data inputs (D) are verDunden together and acted upon by the signal to be transmitted and the clock inputs to each other and the from, for example, periodic signal applied input (C, -,) are connected, wherein the reset input ( "R) of a D-flop-flop (8) to its inverting output (Q) and the set input (S) of the other D-flip -flops (9) with its non-inverting output (Q) and the remaining two outputs of the two D flip-flops (8, 9) with the primary winding (3) of the pulse transformer are connected.
5. A coupler according to any one of claims 1 to 3, characterized in that the beginning and the end of the Sekundär¬ winding (4) with the input and output of nichtin¬-inverting amplifier (5) is connected, on which the transmitted über¬ signal is optionally detachable via a further Verstär¬ ker (6).
6. A coupler according to claim 5, characterized in that the to the secondary winding (4) connected to the non-inverting amplifier and the Ver¬ associated with this are more each formed by an AND gate (12, 13), and the two inputs of a of the aND gates (12, 13) together and to a terminal of the secondary winding (4) and the other two inputs of the aND gates (12, 13) are interconnected and a reset input form ( "Ff) for the secondary side of the coupler, wherein the second terminal of the Sekundär¬ winding (3) to the output of an aND gate (12) ver¬ is connected and at the output of the second aND gate (13), the transmitted signal is removable.
7. The coupler of any of claims 1 to 6, characterized in that the turns of the primary winding and the secondary winding of the pulse transformer of on a flexible insulating support (15) applied printed conductor tracks (149) are made, the ver¬ to form a continuous coil connected are.
PCT/AT1989/000052 1988-06-03 1989-05-24 Coupler for separated-potential transmission of a two-valued signal by means of a pulse transformer WO1989012366A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ATA1452/88 1988-06-03
AT145288A AT391959B (en) 1988-06-03 1988-06-03 Coupler for electrically isolated transmission of a bivalent signal by means of a pulse transformer

Publications (1)

Publication Number Publication Date
WO1989012366A1 true WO1989012366A1 (en) 1989-12-14

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AT (1) AT391959B (en)
WO (1) WO1989012366A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0977406A1 (en) 1998-07-17 2000-02-02 Endress + Hauser Wetzer GmbH + Co. KG Circuit for transmission of galvanically isolated digital signals
US6853685B1 (en) 1998-07-17 2005-02-08 Stephan Konrad Circuit arrangement for the electrically isolated transfer of digital signals
WO2008005224A2 (en) * 2006-06-30 2008-01-10 Lucent Technologies Inc. High inductance, out-of-plane inductors
US10419251B2 (en) 2002-09-18 2019-09-17 Infineon Technologies Digital signal transfer using integrated transformers with electrical isolation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3210509A1 (en) * 1982-03-23 1982-12-09 Gerd Dr Ing Harms Rapid electronic coupling device for the floating transmission of digital electrical control signals
EP0262329A1 (en) * 1986-09-10 1988-04-06 International Business Machines Corporation Flexible circuit magnetic core winding for a core member

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3210509A1 (en) * 1982-03-23 1982-12-09 Gerd Dr Ing Harms Rapid electronic coupling device for the floating transmission of digital electrical control signals
EP0262329A1 (en) * 1986-09-10 1988-04-06 International Business Machines Corporation Flexible circuit magnetic core winding for a core member

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0977406A1 (en) 1998-07-17 2000-02-02 Endress + Hauser Wetzer GmbH + Co. KG Circuit for transmission of galvanically isolated digital signals
US6853685B1 (en) 1998-07-17 2005-02-08 Stephan Konrad Circuit arrangement for the electrically isolated transfer of digital signals
US10419251B2 (en) 2002-09-18 2019-09-17 Infineon Technologies Digital signal transfer using integrated transformers with electrical isolation
WO2008005224A2 (en) * 2006-06-30 2008-01-10 Lucent Technologies Inc. High inductance, out-of-plane inductors
WO2008005224A3 (en) * 2006-06-30 2008-04-24 Lucent Technologies Inc High inductance, out-of-plane inductors

Also Published As

Publication number Publication date
AT391959B (en) 1990-12-27
ATA145288A (en) 1990-06-15
EP0371106A1 (en) 1990-06-06

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