EP0980051B1 - 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
EP0980051B1
EP0980051B1 EP99114605A EP99114605A EP0980051B1 EP 0980051 B1 EP0980051 B1 EP 0980051B1 EP 99114605 A EP99114605 A EP 99114605A EP 99114605 A EP99114605 A EP 99114605A EP 0980051 B1 EP0980051 B1 EP 0980051B1
Authority
EP
European Patent Office
Prior art keywords
coil
signal
primary coil
circuit configuration
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.)
Expired - Lifetime
Application number
EP99114605A
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German (de)
French (fr)
Other versions
EP0980051A1 (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
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 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

  • the invention relates to a circuit arrangement for testing coins in a coin operated device according to the preamble of patent claim 1.
  • 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 chosen one Frequency of the primary signal.
  • 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.
  • 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.
  • a third coil is provided, which is inductively coupled to the primary coil, the signal of the third coil being so the transmit signal of the signal generator acts so that the signal matches the transmit signal.
  • 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 has the same curve shape in this coil as well as in the primary coil. Only the amplitude is due to the reduced Coupling smaller.
  • the signal transmitter 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.
  • 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 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.
  • the circuit arrangement according to the invention enables a predefinable curve shape for the transmitter 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.
  • the single figure shows a circuit arrangement according to the invention.
  • 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 The coin dampens the magnetic field and thus changes the secondary signal on the secondary coil 12.
  • a third coil 14 is on the same winding core like 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 z. B. a square wave voltage.
  • 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 has the effect that the output signal of the operational amplifier 16 is equal to the input signal, regardless of whether temperature changes have occurred or damping of the primary coil 10 has taken place. Thus, when idling, the voltage profile of the signal at the secondary coil 12 is the same as that of the transmission signal from the signal generator 18.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Coins (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Control Of Vending Devices And Auxiliary Devices For Vending Devices (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 long been known. 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 chosen 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 each dampened by the coin, but strongly frequency-dependent. At a Older application (DE 197 26 449) takes advantage of this fact to with a single inductive sensor to test a variety of coin properties.

Ähnliche Anordnungen sind zum Beispiel aus der FR 2 538 934 oder aus der DE 2 034 426 bekannt.Similar arrangements are for example from FR 2 538 934 or known from DE 2 034 426.

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 that 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 transmit signal of the signal generator acts so that the signal matches the transmit 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 has the same curve shape in this coil as well 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 auf den anderen Eingang des Operationsverstärkers geschaltet wird.According to one embodiment of the invention, it is provided that the signal transmitter 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 transmitter 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 The coin dampens the magnetic field and thus changes the secondary signal on the secondary coil 12. A third coil 14 is on the same winding core like 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 z. 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 has the effect that the output signal of the operational amplifier 16 is equal to the input signal, regardless of whether temperature changes have occurred or damping of the primary coil 10 has taken place. Thus, when idling, the voltage profile of the signal at the secondary coil 12 is the same as that of the transmission signal from the signal generator 18.

Claims (7)

  1. A circuit configuration for testing coins in a coin tester, comprising a signal generator which feeds a primary coil with a periodic transmission signal, a secondary coil inductively coupled to the primary coil wherein the magnetic field between the coils is traversed by the coins, characterized in that a third coil (14) is inductively coupled to the primary coil (10) with the signal of the third coil (14) acting onto the transmission signal of the signal generator (18) so as to cause the signal agree with the transmission signal.
  2. The circuit configuration as claimed in claim 1, characterized in that said signal generator (18) is switched onto said primary coil (10) via an operational amplifier (16) and the signal of said third coil (14) is switched onto the other input of said operational amplifier.
  3. The circuit configuration as claimed in claim 1 or 2, characterized in that said primary coil (10) and said third coil (14) are wound onto a common coil form.
  4. The circuit configuration as claimed in any one of claims 1 to 2, characterized in that said primary coil has a ferrite core.
  5. The circuit configuration as claimed in any one of claims 1 to 3 , characterized in that said primary coil is an air-cored coil.
  6. The circuit configuration as claimed in any one of claims 1 to 5, characterized in that said transmission signal is a square-wave or delta mesh voltage.
  7. The circuit configuration as claimed in any one of claims 1 to 5, characterized in that said transmission signal is a pulse of a random 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
DE19836490 1998-08-12
DE19836490A DE19836490C2 (en) 1998-08-12 1998-08-12 Circuit arrangement for checking coins in a coin operated device

Publications (2)

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

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ID=7877274

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Application Number Title Priority Date Filing Date
EP99114605A Expired - Lifetime EP0980051B1 (en) 1998-08-12 1999-07-26 Circuit arrangement for coin testing in a coin operated device

Country Status (4)

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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

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2034426C3 (en) * 1969-08-25 1981-01-15 Adolf 8150 Roggersdorf Hinterstocker Electronic coin validator
AU7949982A (en) * 1981-01-22 1982-07-29 Coin Controls Limited Coin testing
FR2538934A1 (en) * 1982-12-30 1984-07-06 Flonic Sa Device for checking the authenticity of coins
US4809838A (en) * 1987-06-15 1989-03-07 Coin Acceptors, Inc. Coin detection means including a current ramp generator
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
DE19726449C2 (en) * 1997-06-21 1999-04-15 Nat Rejectors Gmbh Method and circuit arrangement for checking coins

Also Published As

Publication number Publication date
DE19836490A1 (en) 2000-02-17
ATE249077T1 (en) 2003-09-15
EP0980051A1 (en) 2000-02-16
ES2205655T3 (en) 2004-05-01
DE19836490C2 (en) 2002-06-20
DE59906832D1 (en) 2003-10-09

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