EP0980051A1 - Circuit arrangement for coin testing in a coin operated device - Google Patents

Circuit arrangement for coin testing in a coin operated device Download PDF

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Publication number
EP0980051A1
EP0980051A1 EP99114605A EP99114605A EP0980051A1 EP 0980051 A1 EP0980051 A1 EP 0980051A1 EP 99114605 A EP99114605 A EP 99114605A EP 99114605 A EP99114605 A EP 99114605A EP 0980051 A1 EP0980051 A1 EP 0980051A1
Authority
EP
European Patent Office
Prior art keywords
coil
signal
circuit arrangement
primary coil
coin
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.)
Granted
Application number
EP99114605A
Other languages
German (de)
French (fr)
Other versions
EP0980051B1 (en
Inventor
Hans-Ulrich Cohrs
Wilfried Meyer
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.)
Crane Payment Innovations GmbH
Original Assignee
National Rejectors Inc GmbH
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Publication date
Application filed by National Rejectors Inc GmbH filed Critical National Rejectors Inc GmbH
Publication of EP0980051A1 publication Critical patent/EP0980051A1/en
Application granted granted Critical
Publication of EP0980051B1 publication Critical patent/EP0980051B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D5/00—Testing specially adapted to determine the identity or genuineness of coins, e.g. for segregating coins which are unacceptable or alien to a currency
    • G07D5/08—Testing the magnetic or electric properties

Definitions

  • a typical inductive Sensor consists of a primary coil and a secondary coil, through which Magnetic field the coins pass through.
  • the damping also depends on the selected one Frequency of the primary signal.
  • the damping At a high frequency and non-magnetic Material takes place in a so-called skin effect, and that with such a signal Damping causes a statement about the surface quality of the Coin too.
  • the field penetrates further into the coin, so that a statement about the type of material inside the coin and also about its Thickness can be taken.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Coins (AREA)
  • Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

Circuit comprises a signal generator (18) with a primary coil (10) for storage of a periodic emitter signal and a secondary coil (12) coupled inductiveyl with the first coil, so that the electric field between the coils is transversed by falling coins with a third coil (14) inductively coupled to the first coil so that its signal acts on the emitter signal so that they are synchronized.

Description

Die Erfindung bezieht sich auf eine Schaltungsanordnung für die Prüfung von Münzen in einem Münzgerät nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a circuit arrangement for testing coins in a coin operated device according to the preamble of patent claim 1.

Induktive Anordnungen zur Münzprüfung sind seit langem bekannt. Ein typischer induktiver Sensor besteht aus einer Primärspule und einer Sekundärspule, durch deren Magnetfeld die Münzen hindurchlaufen. Je nach Beschaffenheit findet eine Dämpfung des Primär- bzw. Sekundärsignals statt. Die Dämpfung ist auch abhängig von der gewählten Frequenz des Primärsignals. Bei einer hohen Frequenz und einem unmagnetischen Material findet ein sog. Skineffekt statt, und die bei einem derartigen Signal verursachte Dämpfung läßt eine Aussage über die Oberflächenbeschaffenheit der Münze zu. Bei niedrigen Frequenzen dringt das Feld weiter in die Münze ein, so daß eine Aussage über die Art des Materials im Inneren der Münze und auch über ihre Dicke getroffen werden kann.Inductive arrangements for coin testing have been known for a long time. A typical inductive Sensor consists of a primary coil and a secondary coil, through which Magnetic field the coins pass through. Depending on the nature, there is damping of the primary or secondary signal instead. The damping also depends on the selected one Frequency of the primary signal. At a high frequency and non-magnetic Material takes place in a so-called skin effect, and that with such a signal Damping causes a statement about the surface quality of the Coin too. At low frequencies, the field penetrates further into the coin, so that a statement about the type of material inside the coin and also about its Thickness can be taken.

In manchen Fällen kommt es darauf an, dem Sendesignal eine bestimmte Kurvenform zu verleihen, beispielsweise ein Rechteck- oder Dreiecksignal zu verwenden. Derartige Signale erzeugen eine Mehrzahl von gerad- oder ungeradzahligen Harmonischen, die jeweils von der Münze gedämpft werden, jedoch stark frequenzabhängig. Bei einer älteren Anmeldung (DE 197 26 449) wird diese Tatsache ausgenutzt, um mit einem einzigen induktiven Sensor eine Mehrzahl von Münzeigenschaften zu testen.In some cases it is important to give the transmission signal a certain curve shape to lend, for example, to use a square or triangular signal. Such Signals generate a plurality of even or odd harmonics, which are dampened by the coin, but heavily frequency-dependent. At a Older application (DE 197 26 449) takes advantage of this fact in order to single inductive sensor to test a variety of coin properties.

Eine derartige Schaltungsanordnung setzt jedoch für eine genaue Bestimmung voraus, daß Temperatur und andere Einflüsse nicht so auf das Sendesignal bzw. Sendefeld einwirken, daß es gegenüber dem Signal des Signalgebers verfälscht ist. Denn die Auswerteschaltung muß stets davon ausgehen, daß die ermittelten Dämpfungskurven solche sind, denen vorgegebene Sendekurven entsprechen. Ist dies nicht mehr der Fall, leidet die Auswertung.However, such a circuit arrangement requires an accurate determination, that temperature and other influences are not so on the transmission signal or field act that it is falsified compared to the signal of the signal generator. Because the Evaluation circuit must always assume that the damping curves determined are those to which specified transmission curves correspond. If this is no longer the case, the evaluation suffers.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Schaltungsanordnung zu schaffen, bei der die in der Primärspule induzierte Spannung gleich der Eingangsspannung ist. The invention is therefore based on the object of providing a circuit arrangement where the voltage induced in the primary coil is equal to the input voltage is.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is achieved by the features of patent claim 1.

Bei der erfindungsgemäßen Schaltungsanordnung ist eine dritte Spule vorgesehen, die mit der Primärspule induktiv gekoppelt ist, wobei das Signal der dritten Spule so auf das Sendesignal des Signalgebers einwirkt, daß das Signal mit dem Sendesignal übereinstimmt.In the circuit arrangement according to the invention, a third coil is provided, which is inductively coupled to the primary coil, the signal of the third coil being so the transmission signal of the signal generator acts so that the signal matches the transmission signal.

Die in der dritten Spule induzierte Spannung wirkt als Gegenkopplungssignal und bewirkt, daß die in der Primärspule induzierte Spannung gleich der Spannung ist, mit der die Primärspule angesteuert wird (Sendesignal). Im Leerlauf wird mithin die Empfängerspule (Sekundärspule) vom selben magnetischen Fluß wie die Primärspule durchsetzt, wodurch auch in dieser Spule die induzierte Spannung die gleiche Kurvenform wie in der Primärspule aufweist. Lediglich die Amplitude ist bedingt durch die verminderte Kopplung kleiner.The voltage induced in the third coil acts as a negative feedback signal and causes that the voltage induced in the primary coil is equal to the voltage with which the primary coil is controlled (transmission signal). The receiver coil is therefore idle (Secondary coil) penetrated by the same magnetic flux as the primary coil, whereby the induced voltage in this coil also has the same curve shape as in the primary coil. Only the amplitude is due to the reduced Coupling smaller.

Nach einer Ausgestaltung der Erfindung ist vorgesehen, daß der Signalgeber über ein Operationsverstärker auf die Primärspule geschaltet ist und das Signal der dritten Spule aufden anderen Eingang des Operationsverstärkers geschaltet wird.According to one embodiment of the invention it is provided that the signal generator via a Operational amplifier is connected to the primary coil and the signal of the third Coil is connected to the other input of the operational amplifier.

Eine besonders einfache Ausgestaltung der Erfindung sieht vor, daß die dritte Spule als weitere Wicklung auf den Wickelkörper für die Primärspule gewickelt ist. Die Primärspule kann im übrigen ein Ferritkern aufweisen oder auch als Luftspule ausgeführt sein. Das Sendesignal ist vorzugsweise eine Rechteck- oder Dreieckspannung. Es kann jedoch auch ein Impuls beliebiger Form sein.A particularly simple embodiment of the invention provides that the third coil is wound as a further winding on the winding body for the primary coil. The In addition, the primary coil can have a ferrite core or can also be designed as an air coil his. The transmission signal is preferably a square or triangular voltage. However, it can also be an impulse of any shape.

Die erfindungsgemäße Schaltungsanordnung ermöglicht eine vorgebbare Kurvenform für das Sendefeld, die über den gesamten Temperaturbereich konstant ist. Es ist daher möglich, unabhängig von Störeinwirkungen Materialuntersuchungen an den Münzen mit oberwellenhaltigen Feldern durchzuführen.The circuit arrangement according to the invention enables a predefinable curve shape for the transmission field, which is constant over the entire temperature range. It is therefore possible, regardless of interference material tests on the coins with fields containing harmonics.

Die Erfindung wird anhand eines Ausführungsbeispiels näher erläutert.The invention is explained in more detail using an exemplary embodiment.

Die einzige Figur zeigt eine Schaltungsanordnung nach der Erfindung.The single figure shows a circuit arrangement according to the invention.

In der Zeichnung ist eine Primärspule 10 dargestellt, die magnetisch mit einer Sekundärspule 12 gekoppelt ist. Zwischen den Spulen 10, 12 befindet sich der Laufweg einer nicht dargestellten Münze. Bei der Durchquerung des Magnetfeldes durch die Münze erfolgt eine Dämpfung des Magnetfeldes und damit eine Änderung des Sekundärsignals an der Sekundärspule 12. Eine dritte Spule 14 ist auf den gleichen Wickelkern wie die Primärspule 10 gewickelt und lastfrei geschaltet. Die in ihr induzierte Spannung wird auf den negativen Eingang eines Operationsverstärkers 16 gegeben, dessen positiver Eingang mit einem Signalgeber 18 verbunden ist. Der Signalgeber erzeugt z. B. eine Rechteckspannung. In the drawing, a primary coil 10 is shown magnetically with a secondary coil 12 is coupled. There is a path between the coils 10, 12 coin not shown. When crossing the magnetic field through the Coin is damped by the magnetic field and thus a change in the secondary signal on the secondary coil 12. A third coil 14 is on the same winding core how the primary coil 10 wound and switched load-free. The one induced in it Voltage is applied to the negative input of an operational amplifier 16, whose positive input is connected to a signal generator 18. The signal generator generates e.g. B. a square wave voltage.

Die in der Spule 14 induzierte Spannung L14d/dt wird mithin als Gegenkopplungssignal auf den Differenzverstärker 16 gegeben. Dadurch wird bewirkt, daß das Ausgangssignal des Operationsverstärkers 16 gleich dem Eingangssignal ist, unabhängig davon, ob Temperaturänderungen aufgetreten sind oder eine Bedämpfung der Primärspule 10 stattgefunden hat. Im Leerlauf ist mithin der Spannungsverlauf des Signal an der Sekundärspule 12 mit dem des Sendesignals des Signalgebers 18 gleich.The voltage L 14 d / dt induced in the coil 14 is therefore given to the differential amplifier 16 as a negative feedback signal. This causes the output signal of the operational amplifier 16 to be equal to the input signal, regardless of whether temperature changes have occurred or the primary coil 10 has been damped. Thus, when idling, the voltage profile of the signal at the secondary coil 12 is the same as that of the transmit signal from the signal generator 18.

Claims (7)

Schaltungsanordnung für die Prüfung von Münzen in einem Münzgerät, mit einem Signalgeber, der eine Primärspule mit einem periodischen Sendesignal speist, einer mit der Primärspule induktiv gekoppelten Sekundärspule, wobei das magnetische Feld zwischen den Spulen von den Münzen durchquert wird, dadurch gekennzeichnet, daß eine dritte Spule (14) induktiv mit der Primärspule (10) gekoppelt ist, wobei das Signal der dritten Spule (14) so auf das Sendesignal des Signalgebers (18) einwirkt, daß das Signal mit dem Sendesignal übereinstimmt.Circuit arrangement for checking coins in a coin operated device, with a Signal generator that feeds a primary coil with a periodic transmission signal, one with the primary coil inductively coupled secondary coil, the magnetic Field between the coils is crossed by the coins, characterized in that a third coil (14) inductively coupled to the primary coil (10) is, the signal of the third coil (14) thus on the transmission signal of the signal generator (18) acts that the signal coincides with the transmission signal. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß der Signalgeber (18) über einen Operationsverstärker (16) auf die Primärspule (10) geschaltet ist und das Signal der dritten Spule (14) auf den anderen Eingang des Operationsverstärkers geschaltet wird.Circuit arrangement according to claim 1, characterized in that the signal transmitter (18) connected to the primary coil (10) via an operational amplifier (16) and the signal of the third coil (14) to the other input of the operational amplifier is switched. Schaltungsanordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß Primärspule (10) und dritte Spule (14) auf einem gemeinsamen Wickelkörper gewickelt sind.Circuit arrangement according to claim 1 or 2, characterized in that the primary coil (10) and third coil (14) wound on a common winding body are. Schaltungsanordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Primärspule einen Ferritkern aufweist. Circuit arrangement according to one of claims 1 to 3, characterized in that that the primary coil has a ferrite core. Schaltungsanordnung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Primärspule eine Luftspule ist.Circuit arrangement according to one of claims 1 to 3, characterized in that that the primary coil is an air coil. Schaltungsanordnung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Sendesignal eine Rechteck- oder Dreieckspannung ist.Circuit arrangement according to one of claims 1 to 5, characterized in that that the transmission signal is a square or triangular voltage. Schaltungsanordnung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Sendesignal ein Impuls beliebiger Form ist.Circuit arrangement according to one of claims 1 to 5, characterized in that that the transmission signal is a pulse of any shape.
EP99114605A 1998-08-12 1999-07-26 Circuit arrangement for coin testing in a coin operated device Expired - Lifetime EP0980051B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19836490A DE19836490C2 (en) 1998-08-12 1998-08-12 Circuit arrangement for checking coins in a coin operated device
DE19836490 1998-08-12

Publications (2)

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EP0980051A1 true EP0980051A1 (en) 2000-02-16
EP0980051B1 EP0980051B1 (en) 2003-09-03

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EP99114605A Expired - Lifetime EP0980051B1 (en) 1998-08-12 1999-07-26 Circuit arrangement for coin testing in a coin operated device

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EP (1) EP0980051B1 (en)
AT (1) ATE249077T1 (en)
DE (2) DE19836490C2 (en)
ES (1) ES2205655T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007046390B3 (en) 2007-09-20 2008-11-27 National Rejectors, Inc. Gmbh Method for checking coins

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2034426A1 (en) * 1969-08-25 1971-03-04 Hinterstocker A Electronic coin acceptor
DE3201038A1 (en) * 1981-01-22 1982-08-12 Coin Controls Ltd., Royton, Lancashire Device for checking coins
FR2538934A1 (en) * 1982-12-30 1984-07-06 Flonic Sa Device for checking the authenticity of coins
EP0295610A2 (en) * 1987-06-15 1988-12-21 Coin Acceptors, Inc. Coin detection means
DE19726449A1 (en) 1997-06-21 1999-01-07 Nat Rejectors Gmbh Method and circuit arrangement for checking coins

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8912522D0 (en) * 1989-05-26 1989-07-19 Coin Controls Coin discrimination apparatus with temperature compensation
DE4101157A1 (en) * 1991-01-14 1992-07-16 Trenner D Wh Muenzpruefer DEVICE FOR TESTING COINS OR THE SAME METAL DISC
US5293979A (en) * 1991-12-10 1994-03-15 Coin Acceptors, Inc. Coin detection and validation means

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2034426A1 (en) * 1969-08-25 1971-03-04 Hinterstocker A Electronic coin acceptor
DE3201038A1 (en) * 1981-01-22 1982-08-12 Coin Controls Ltd., Royton, Lancashire Device for checking coins
FR2538934A1 (en) * 1982-12-30 1984-07-06 Flonic Sa Device for checking the authenticity of coins
EP0295610A2 (en) * 1987-06-15 1988-12-21 Coin Acceptors, Inc. Coin detection means
DE19726449A1 (en) 1997-06-21 1999-01-07 Nat Rejectors Gmbh Method and circuit arrangement for checking coins

Also Published As

Publication number Publication date
DE19836490C2 (en) 2002-06-20
ATE249077T1 (en) 2003-09-15
DE59906832D1 (en) 2003-10-09
ES2205655T3 (en) 2004-05-01
EP0980051B1 (en) 2003-09-03
DE19836490A1 (en) 2000-02-17

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