EP0980051B1 - Schaltungsanordnung für die Prüfung von Münzen in einem Münzgerät - Google Patents

Schaltungsanordnung für die Prüfung von Münzen in einem Münzgerät 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
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0980051A1 (de
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/de
Application granted granted Critical
Publication of EP0980051B1 publication Critical patent/EP0980051B1/de
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)
EP99114605A 1998-08-12 1999-07-26 Schaltungsanordnung für die Prüfung von Münzen in einem Münzgerät Expired - Lifetime EP0980051B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19836490 1998-08-12
DE19836490A DE19836490C2 (de) 1998-08-12 1998-08-12 Schaltungsanordnung für die Prüfung von Münzen in einem Münzgerät

Publications (2)

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

Family

ID=7877274

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99114605A Expired - Lifetime EP0980051B1 (de) 1998-08-12 1999-07-26 Schaltungsanordnung für die Prüfung von Münzen in einem Münzgerät

Country Status (4)

Country Link
EP (1) EP0980051B1 (es)
AT (1) ATE249077T1 (es)
DE (2) DE19836490C2 (es)
ES (1) ES2205655T3 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007046390B3 (de) 2007-09-20 2008-11-27 National Rejectors, Inc. Gmbh Verfahren zum Prüfen von Münzen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2034426C3 (de) * 1969-08-25 1981-01-15 Adolf 8150 Roggersdorf Hinterstocker Elektronischer Münzprüfer
AU7949982A (en) * 1981-01-22 1982-07-29 Coin Controls Limited Coin testing
FR2538934A1 (fr) * 1982-12-30 1984-07-06 Flonic Sa Dispositif de controle de l'authenticite de pieces de monnaie
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 (de) * 1991-01-14 1992-07-16 Trenner D Wh Muenzpruefer Vorrichtung zur pruefung von muenzen oder dergleichen metallischen scheiben
US5293979A (en) * 1991-12-10 1994-03-15 Coin Acceptors, Inc. Coin detection and validation means
DE19726449C2 (de) * 1997-06-21 1999-04-15 Nat Rejectors Gmbh Verfahren und Schaltungsanordnung zur Prüfung von Münzen

Also Published As

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

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