EP0106848A1 - Circuit pour un appareil telephonique a prepaiement - Google Patents

Circuit pour un appareil telephonique a prepaiement

Info

Publication number
EP0106848A1
EP0106848A1 EP19830900696 EP83900696A EP0106848A1 EP 0106848 A1 EP0106848 A1 EP 0106848A1 EP 19830900696 EP19830900696 EP 19830900696 EP 83900696 A EP83900696 A EP 83900696A EP 0106848 A1 EP0106848 A1 EP 0106848A1
Authority
EP
European Patent Office
Prior art keywords
microprocessor
clock
clock pulse
switch
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.)
Withdrawn
Application number
EP19830900696
Other languages
German (de)
English (en)
Inventor
Alfred Nyffenegger
Walter Messerli
Walter Zbinden
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.)
Ascom Autelca AG
Autelca AG
Original Assignee
Ascom Autelca AG
Autelca AG
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 Ascom Autelca AG, Autelca AG filed Critical Ascom Autelca AG
Publication of EP0106848A1 publication Critical patent/EP0106848A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M17/00—Prepayment of wireline communication systems, wireless communication systems or telephone systems
    • H04M17/02—Coin-freed or check-freed systems, e.g. mobile- or card-operated phones, public telephones or booths
    • H04M17/023—Circuit arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations

Definitions

  • the invention relates to a circuit arrangement for a payphone.
  • Self cashier of pay phones have a Münz ⁇ tester to the inserted coins fen to prü ⁇ , and switches and / or shut-off devices to the coins which are unacceptable to steer into the coin return and save the acceptable coins and guide for collecting the coin .
  • the loop direct current which can fluctuate between approximately 20 and 80 mA depending on the load on the telephone network, is often not sufficient for the operation of the electrical components of the self-cashier, especially the coin validation device and the drive devices for the switches and shut-off devices.
  • the object of the invention is to remove all electrical components of a payphone.
  • FIG. 1 is a block diagram of the parts of the circuit arrangement of a payphone essential for the invention
  • Fig. 2 is a more detailed schematic diagram of a "" Sperr ⁇ vibrator and a switching regulator circuit of the circuit arrangement of Fig. 1,
  • Fig. 3 shows a more detailed circuit diagram of two
  • Fig. 1 the two lines of the subscriber loop are designated in the usual way with a and b.
  • the subscriber station shown has, in parallel to the input (a, b), a conventional surge arrester (not shown) and the input of a sieve element (not shown) which is permeable to the AC frequency of the tax pulses and which is connected to the clock pulse counter.
  • the connecting lines 1, 2 of the subscriber station are connected to the subscriber lines a, b by a pole changeover switch 3, the control circuit of which, described in more detail below, ensures that the connecting lines 1, 2 are always the same when the telephone receiver is lifted (closed subscriber loop) Have polarity.
  • a changeover switch 4 connects the connecting line 2 to the one end of a diagonal branch of a rectifier bridge circuit (Graetz circuit) 5 in the rest position shown (with the subscriber loop open); the other end of the diagonal branch is connected to line 1.
  • the switch 4 remains in the rest position as long as the hook switch 6 is in the rest position, that is to say the telephone receiver is not removed.
  • a charging resistor 7 e.g. 22 kilohms
  • Bridge circuit 5 connected storage capacitor 8 (e.g. 20 mF) slowly (time constant e.g. 7 min.) Charged by the loop voltage (e.g. H8 V) to a voltage of e.g. 33 V limited by a Zener diode 9, which is a multiple of the setpoint the operating voltage (5 or 10 V) of the electrical components described below Self-cashier of the payphone is.
  • a manually operable switch 10 and a light-emitting diode 11 are connected in parallel with the charging resistor 7 and indicate the charging current to the installer.
  • the blocking oscillator 13 which is shown in more detail in FIG. 2, works as a direct voltage converter and serves to recharge the storage capacitor 8, increasing the part of the loop voltage applied to it, so that the storage capacitor 8 is recharged to the voltage of, for example, 33 V.
  • the storage capacitor 8 feeds two identically constructed switching regulators 14, 15, the first of which regulates an output voltage U of 5 V and the second regulates an output voltage O of 10 V.
  • the output voltages U and U are selected in accordance with the nominal values of the operating voltages of the electrical components of the self-cashier.
  • the self-cashier has a coin validator as well as several switches and shut-off devices to check the inserted coins, to direct the unacceptable coins into the coin return and to store the acceptable coins in memory channels and to store them at the end of the telephone conversation. direct those coins that are required to pay the fee into the coin box and return the remaining coins.
  • a microprocessor is provided for the evaluation of the test signals of the coin validation bodies, the calculation of the call fee and the determination of the coins to be cashed and returned, as well as the corresponding control of the turnouts and locking devices.
  • the parts of the self-cashier mentioned are in Switzerland. Patent Applications Nos. 1 321/82, 1 322/82 and 2 042/82 are described in detail. Of these components 1 are two in Fig.
  • a microprocessor (CPU) 19, to which the test signals are supplied from a plurality of testing members of a coin selector 20 and clock pulse • .Two illustrated transmitter 21, 22, which in of the type described in more detail below by a switching device 23 alternately connected to the clock input of the microprocessor 19.
  • a supply voltage U p of 10 V is required for the DC motors 17, 18, and a supply voltage U of 5 V is required for the other components 19 to 23.
  • the DC motors 17, 18 are supplied by the switching regulator 15.
  • the components 19-23 of the self-cashier are fed by the loop direct current as long as this is sufficient for this. If the part of the loop voltage lying on the components 19-23 falls below U., these components are fed by the switching regulator 14. It is known that switching regulators have the property that they keep the output voltage constant despite fluctuations in the input voltage and the load current. A particularly high degree of efficiency is achieved with the circuit of the switching regulator 14 shown in more detail in FIG. 2.
  • the output voltage is regulated by changing the duty cycle of a transistor switch, and the reference voltage required for the regulation is generated by a storage capacitor 8 and supplies a constant current from a few microamperes of the type LM234 (National Semiconductor) and by a Zener diode 29 limited.
  • the switching regulator 15 is constructed in the same way as the switching target 14. Between the output of the switching regulator 14, 15 and the common reference line 2, a capacitor 30, 31 is connected, which on the one hand serves as a memory for the voltage U 1 , U 2 and on the other hand for smoothing the inductor 32 and the transistor 33 of the switching regulator 14, 15 generates switch-on pulses.
  • the components 19-23 are fed directly from the loop (not by the converters 13, 14) if the direct current in the loop (and the charged storage capacitor) is sufficient, the power supply being provided by a diode 35.
  • the microprocessor 19 is a so-called non-statically operable C-M0S microprocessor of the type NSC800.
  • Such microprocessors • have the advantage that they use little electricity. However, clock pulses of a certain minimum frequency must be continuously supplied to them so that the information stored in the registers is retained, ie the register content has to be "refreshed” periodically.
  • the power requirement of the microprocessor increases with the clock frequency; With the NSC800 microprocessor, the power consumption increases. B. from about 2 mA at 100 kHz to 12 mA at 4 MHz. It has now been recognized that the energy required per operation of the microprocessor at high clock
  • OMPI frequency is smallest.
  • the microprocessor is operated with a high clock frequency of 5 MHz in order to carry out its arithmetic and logical operations and with a low clock frequency of 50 kHz * after the completion of the operations to be carried out the register information of the microprocessor. is sufficient.
  • the two clock pulse generators 21 and 22 for the clock pulse frequency of 5 MHz and 50 kHz and the switching device 23 required for switching between the two clock pulse generators are shown in more detail in FIG. 3.
  • FIG. 4 shows the pulse sequences that occur in each case on the lines labeled A to K of the circuit of FIG. 3.
  • the 5 MHz clock pulse generator 21 is a crystal oscillator which is connected to the clock pulse input of the microprocessor 19 via an electronically controlled switch (CMOS analog switch) 38, a Schmitt trigger 39 and a further electronically controlled switch 40.
  • CMOS analog switch electronically controlled switch
  • the Schmitt trigger 39 is used on the one hand to convert the sine wave train of the quartz oscillator 21 into a rectangular pulse train and on the other hand to reduce the energy consumption: the quartz oscillator 21 is in constant operation and is operated with the lowest possible power. Its oscillator signal is not sufficient for clocking the microprocessor 19. The signal is amplified by the Schmitt trigger 39, and accordingly the power consumption of the Schmitt trigger is substantially greater than that of the oscillator 21.
  • the Schmitt trigger 39 only works when the switch 38 is closed and this is how described in more detail below, the case only briefly.
  • the 50 kHz clock pulse generator 22 formed by an RC generator equipped with a Schmitt trigger is connected to the clock pulse input of the microprocessor 19 via an electronic switch 41.
  • the switchover device 23 has four D flip-flops 42 to 45 and a pulse converter 46 for controlling the switches 38, 40, 41, each D flip-flop 42 to 45 having a dynamic C input designed as a clock input with edge control.
  • the switching device 23 works as follows: in the idle state, the switches 38, 40 are open and the switch 41 is closed; the clock pulse input • of the microprocessor 19 is clocked at the clock frequency of 50 kHz of the pulse generator 22, which is sufficient to receive the register information of the microprocessor.
  • Interrupt Control block ICB 47 a signal from one of Münz ⁇ testing members 20 or a command generator of Münzfern ⁇ speaker, for example a 'Chalter from Gabels 6 betätig ⁇ th or by the customer to trigger an operation of the microprocessor and the Display of the result of the operation of the command transmitter to be actuated, switches 38, 40 are closed and switch 41 opened, as will be explained in more detail below, whereupon the clock pulse input of the microprocessor 19 is clocked at the clock frequency of 5 MHz of the clock pulse generator 21 .
  • the microprocessor 19 carries out the operations with the high clock frequency which are necessary due to the signal received from the interrupt control block (ICB) carries out.
  • the microprocessor 19 gives a short impulse to the line C at the point in time designated t in FIG. 4, so that after the delay described below during which the microprocessor carries out the last required operations, the stopover the clock frequency is triggered. Because the C entrance
  • the circuit part 46 outputs a rectangular pulse which is longer in time than the pulse of the microprocessor, on its output line E, which is connected to the negated input of an AND gate 49, the other negated input of which is connected to line D, so that the variable on the output line F of the AND gate 49 connected to the D input of the flip-flop 44 assumes the value one after the end of the rectangular pulse generated by the circuit part 46.
  • this point in time is designated t p .
  • the C input of the flip-flop 44 is connected to the 50 kHz clock pulse generator 22, so that the flip-flop 44 is set to the value one on the rising edge of the next 50 kHz clock pulse.
  • This time is indicated with t-; the line G, which is connected to the Q output of the flip-flop 44, is connected to the D input of the flip-flop 45, the C input of which is connected to the output of the Schmitt trigger 39, so that the Input value one b -l of the rising edge of the next following check pulse of the 5 MHz clock pulse sequence is stored in the flip-flop 45.
  • t ⁇ This time is denoted by t ⁇ .
  • the value at the Q output of flip-flop 45 changes from zero to one and the value at the Q output (negated Q output) from one to zero.
  • the switch 41 connected to the Q output is closed and the switch 40 connected to the ZJ output is opened.
  • the switch 38 is opened because of the Q output of flip-flop 45 is connected to the C input of flip-flop 43, the output signal of which controls switch 38.
  • the switching process is controlled by the flip-flop 45 such that the pulse interval of the clock pulses supplied to the microprocessor when switching is at least equal to the pulse interval of the clock pulse sequence supplied by the 5 MHz clock pulse generator 21. If the switches 40, 41 not controlled by the flip-flop 45 but also from the flip-flop 44 as described above, would then be 'switched at the time t, so that a smaller pulse spacing would result, which could lead to disturbances in the microprocessor •.
  • the interruption control block (ICB) 47 again receives a signal from a further checking device of the coin validator 20 or a command from one of the commanders, it sets the output signal on line K to the value one, which is the flip-flop
  • flip-flop 43 is set on the one hand and switch 38 is closed by its output signal, and on the other hand the output signal on line D is set to one, so that the. AND gate 49 is no longer permeable and the variable at the D input (line F) of flip-flop 44 assumes the value zero.
  • the flip-flop 44 is reset on the next following rising edge of the pulse train of the encoder 22, at the time tg, and the flip-flop 45 is then reset on the next following rising edge of the pulse train of the Schmitt trigger 39, at the time t 7 , as a result of which the switch 40 is closed and the switch 41 is opened.
  • Patent application No. 2 042/82 blocking devices and switches of the payphone are driven by DC electric motors with permanent field magnets, two motors 17, 18 of which are shown in FIG. 1.
  • One pole of the motor 1.7 is sen angeschlos ⁇ to the connection line 2, the other pole of a capacitor 50, which by one of two transistors 51, 52 switch formed alternately with the on • potential U p lying output of the switching regulator 15 and with the connecting line 2 is connectable.
  • the bases of the two transistors 51, 52 are one
  • Non-link 53 connected to an output of the microprocessor 19.
  • the motor 17 is driven in one direction of rotation in order to move the switch or shut-off device in one position and in the other direction to move it to the other position.
  • the microprocessor 19 changes its output signal at the non-link 53 from one to zero when the motor is rotating in one direction and from zero to one when it is to be driven in the other direction.
  • the NPN transistor 51 becomes conductive and the PNP transistor 52 becomes non-conductive.
  • An excitation current then flows through the motor 17 until the capacitor 50 is charged.
  • the microprocessor 19 changes the output signal from zero to one, the transistor 52 becomes conductive and the transistor 51 becomes non-conductive, so that the capacitor 50 discharges, whereby the motor 17 is driven in the other direction.
  • the operating voltage of the motor 17 is only 5 V, but the capacitor 50 is charged to 10 V, so that the motor is operated with overvoltage at the start of the rotary movement and thus a large torque at the start of the rotation occurs so that the switch or shut-off device is actuated quickly and the voltage on the motor during the capacitor discharge corresponds approximately to its operating voltage.
  • the shut-off devices and switches of the self-cashier could also be actuated by solenoids acting on permanent magnets, which are fed in the same way as the electric motors 17, 18 by the circuit parts 50 to 53 corresponding circuit parts.
  • the pole-changing switch 3 has a polarized relay 5 having a permanent magnet, the control circuit of which is constructed in the same way as that of the motors 17, 18 and has a capacitor 55, two transistors 56, 57 and a Schmitt trigger 58, the output of which is connected to the bases of the transistors 56, 57 and its input to the output of the audio circuit 12.
  • the Schmitt trigger 58 therefore receives a signal which effects the pole changeover only when the fork switch 6 is closed. If the subscriber loop is open, there is no switchover, and therefore no energy is consumed for it.
  • the rectifier bridge circuit 5 ensures that the capacitor 8 always remains the same polarity, even with an open loop, regardless of the polarity of the subscriber lines a, b.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Security & Cryptography (AREA)
  • Prepayment Telephone Systems (AREA)
  • Control Of Vending Devices And Auxiliary Devices For Vending Devices (AREA)

Abstract

Un condensateur d'accumulation (8) est agencé de manière à être chargé par la tension d'alimentation de l'appareil lorsque le circuit d'abonné (a, 1, 2, b) est ouvert. Un convertisseur continu-continu (14, 15) alimente les éléments électriques (17 à 20) du dispositif d'encaissement avec la tension du condensateur abaissée à la tension de fonctionnement, lorsque la partie de la tension d'alimentation appliquée aux éléments (17 à 20), quand le circuit d'aboné (a, 1, 2, b) est fermé, tombe en dessous de la tension de fonctionnement. Lorsque le circuit d'abonné est fermé, le condensateur d'accumulation (8) est rechargé par un deuxième convertisseur continu-continu (13) qui accroît la partie de la tension d'alimentation qui lui est appliquée. Ainsi, tous les éléments électriques du dispositif d'encaissement peuvent être alimentés exclusivement à partir du courant continu d'alimentation de l'appareil.
EP19830900696 1982-04-27 1983-02-28 Circuit pour un appareil telephonique a prepaiement Withdrawn EP0106848A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2565/82 1982-04-27
CH256582A CH654705A5 (de) 1982-04-27 1982-04-27 Schaltungsanordnung fuer einen muenzfernsprecher.

Publications (1)

Publication Number Publication Date
EP0106848A1 true EP0106848A1 (fr) 1984-05-02

Family

ID=4236664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830900696 Withdrawn EP0106848A1 (fr) 1982-04-27 1983-02-28 Circuit pour un appareil telephonique a prepaiement

Country Status (4)

Country Link
EP (1) EP0106848A1 (fr)
CH (1) CH654705A5 (fr)
WO (1) WO1983003940A1 (fr)
YU (1) YU95083A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1179742B (it) * 1984-07-27 1987-09-16 Urmet Spa Apparecchio telefonico per uso pubblico con microprocessore di gestione integrale
FR2617357B1 (fr) * 1987-06-24 1994-04-29 Crouzet Sa Appareil telephonique public a connexion permanente

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE565493A (fr) * 1957-09-17
CH589395A5 (fr) * 1975-09-11 1977-06-30 Sodeco Compteurs De Geneve
EP0009106A1 (fr) * 1978-09-27 1980-04-02 Ascom Autelca Ag Circuit pour l'excitation d'un électroaimant dans un téléphone à pièces de monnaie
AU6606881A (en) * 1980-01-16 1981-07-23 Medtronic, Inc. Pacemaker

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8303940A1 *

Also Published As

Publication number Publication date
WO1983003940A1 (fr) 1983-11-10
CH654705A5 (de) 1986-02-28
YU95083A (en) 1986-04-30

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Inventor name: MESSERLI, WALTER

Inventor name: ZBINDEN, WALTER

Inventor name: NYFFENEGGER, ALFRED