EP0356260A2 - Circuit de commande - Google Patents

Circuit de commande Download PDF

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Publication number
EP0356260A2
EP0356260A2 EP89308678A EP89308678A EP0356260A2 EP 0356260 A2 EP0356260 A2 EP 0356260A2 EP 89308678 A EP89308678 A EP 89308678A EP 89308678 A EP89308678 A EP 89308678A EP 0356260 A2 EP0356260 A2 EP 0356260A2
Authority
EP
European Patent Office
Prior art keywords
control circuit
circuit
switch
event
occurrence
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Withdrawn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
EP89308678A
Other languages
German (de)
English (en)
Other versions
EP0356260A3 (fr
Inventor
Stephen Macmillan
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0356260A2 publication Critical patent/EP0356260A2/fr
Publication of EP0356260A3 publication Critical patent/EP0356260A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/001—Functional circuits, e.g. logic, sequencing, interlocking circuits

Definitions

  • THIS INVENTION relates to a control circuit for an electrical circuit.
  • the invention has application to an electrical circuit which is controlled from a master switch and relates to the provision of a control circuit between the master switch and the electrical circuit to resist the possibility of unauthorised activation of the electrical circuit.
  • the invention resides in a control circuit for an electrical circuit comprising an input adapted to be connected to a master switch for the electrical circuit and an output adapted to be connected to the electrical circuit said control circuit providing a connection between the input and output having a first device which can be selectively rendered conductive a second device associated with the first device to provide a condition at which said first device is rendered conductive a third device associated with both the first and second devices, a control switch connected between the second device and first device whereby on the occurrence of a first event whereby the first device is non-conductive and the master switch is closed and the control switch is closed subsequently within a first period of time the second device is able to provide the condition to render the first device conductive and on the occurrence of a separate second event whereby the first device is non-conductive and the master switch is closed and the control switch is subsequently closed after the expiration of the first period of time the third device interacts with the second device to prevent creation of the condition.
  • said third device is associated with the first device whereby on the occurrence of a third event at which the first device is conductive and said master switch is opened the third device will provide a second condition to maintain the first device conductive for a second period of time.
  • the third device interacts with the second device on the occurrence of a fourth event when subsequent to the occurrence of the second event the master switch is closed the third device prevents creation of said condition by the second device.
  • said second device is associated with a fourth device connected to the opposite side of said control switch from said second device whereby on the occurrence of a fifth event when the control switch is closed prior to the closure of the master switch the second device is prevented from providing said condition.
  • control circuit as claimed at any one of the preceding claims wherein said first device comprises a controlled rectifier and said second device is connected to the gate of the control rectifier.
  • said first device is selected from one of the following:- a silicon controlled rectifier; a triac; or a silicon controlled switch.
  • the embodiment relates to a security control circuit for use with an automobile to prevent unauthorised use of the motor vehicle.
  • the embodiment comprises a device which is to be connected between the ignition switch of the vehicle and the ignition circuit of the engine of the vehicle.
  • the device comprises an input terminal which is to be connected to the ignition switch an output terminal which is to be connected to the ignition circuit and an earth terminal. Connection between the input and the output is effected by a pair of relay terminals 11 which are controlled from a relay coil 12 which is part of the control circuit.
  • the current flow through the relay coil 12 is controlled by a silicon controlled rectifier 13 which is connected in series with the relay between the input terminal and the earth terminal.
  • a stabilising circuit comprising a resistor R8 and a capacitor C3 is connected across the gate and cathode of silicon controlled rectifier 13.
  • the gate of the silicon controlled rectifier 13 is connected via one end of the stabilising circuit to a control switch 14 and a first capacitative circuit located on the opposite side of the control switch 14 from the silicon control rectifier 13.
  • the first capacitative circuit comprises a capacitor C2 and a resistor R6 which are connected in parallel to earth.
  • the input terminal is connected via a diode D1 and resistor R2 to a second capacitative circuit which comprises a capacitor C1 and a resistor R4 connected in a parallel array in series with the first capacitative circuit to provide a junction 15 which provides the connection between the control switch 14 and both capacitative circuits.
  • the first capacitative circuit is connected to the relay 12 through a diode D2 and resistor R3.
  • the first capacitative circuit which comprises capacitor C2 and R6 is associated with a resistor R7 to the opposite side of the control switch from the first capacitative circuit whereby the resistor R7 and first capacitative circuit are in parallel on closure of the switch 14.
  • the relative value of the capacitor C2 of the first capacitative circuit and the value of the capacitor C1 of the second capacitative circuit are such that on closure of the ignition switch the first capacitative circuit is substantially fully charged almost instantaneously whereas the second capacitative circuit is nearly completely charged after the expiration of a first period of time (e.g. 10 seconds).
  • a first period of time e.g. 10 seconds
  • the capacitance of capacitor C1 is approximately 50 times the capacitance of C2.
  • resistor R4 is approximately 10 times the resistance of R6, the resistance at which is approximately four times the resistance of R6.
  • R2 has resistance of 1 k ohms
  • R4 has a resistance of 47 k ohms
  • R2 has a resistance of 3.9 k ohms
  • R7 has a resistance of 120 ohms
  • C1 has a capacitance of 2200 uf
  • C2 has a capacitance of 47 uf.
  • the control switch 14 comprises a magnetically sensitive switch which will close on a magnetic field being brought into close proximity to the switch whereby the magnetic field may be provided by a small permanent magnet.
  • the circuit is provided with two terminals A and B which may be located to either side of the control switch 14 and which may be used with any other form of switching device if desired.
  • control circuit is such that on closure of the ignition switch there is no current flow through the relay coil 12 since the silicon controlled rectifier 13 is non-conductive.
  • the voltage condition which then exists at the junction 15 causes activation of the gate of the silicon controlled rectifier 13 to render it conductive.
  • the stabilising circuit which comprises capacitor C3 and resistor R8 in parallel serves to stabilise the voltage at the gate of silicon controlled rectifier 13 to prevent inadvertent activation of the gate and thus false triggering of the silicon controlled rectifier 13 to the conductive state. Once triggered the silicon controlled rectifier 13 will remain conductive while the ignition switch remains closed irrespective of whether the control switch 14 remains closed.
  • control switch 14 If the control switch 14 is not closed within the first period of time the second capacitative circuit and in particular capacitor C1 will be fully charged which results in a voltage being expressed at the junction 15 which is insufficient to activate the gate of the silicon controlled rectifier 13. As a result the control circuit provides a security device for the operation of the ignition switch whereby on the ignition switch being closed the control switch 14 must also be closed within the predetermined first period of time.
  • the second capacitative circuit When the ignition switch is turned OFF after the controlled rectifier has been rendered conductive the second capacitative circuit will be caused to discharge through diode D2, resistor R3, the relay coil 12, and the silicon controlled rectifier 13 to maintain a holding current in the silicon controlled rectifier 13 during that discharge of the capacitor C1 which will take place over a second period of time. On the expiration of that second period of time when the capacitor C1 is substantially discharged the silicon controlled rectifier 13 will be rendered non-conductive.
  • a direct connection is provided to the ignition circuit of the vehicle. This provides a security where the ignition switch is turned OFF inadvertently or its turned OFF subsequent to the engine having stalled and it being necessary to switch the ignition switch to the OFF position before re-starting the engine.
  • junction 15 assumes a voltage which is formed by resistors R2, R6 and R7, R7 being significantly low in resistance to render R6 irrelevant. As a result the voltage present at junction 15 is not sufficient to enable activation of the gate of the silicon control rectifier 13. As a result it is not possible to close the control switch 14, hold at closed and then subsequently close the ignition switch to start the engine.
  • the control switch 14 which comprises a magnetically sensitive switch is intended to be located at some "hidden" location on the vehicle which is known only to authorised persons and which is hidden behind a wall formed of a material which does not provide a magnetic shield.
  • the output of the circuit may be associated with any other form of electrical circuit in the vehicle for activation of those other circuits in accordance with a similar procedure to that set out above.
  • control circuit may be utilised in association with any other form of electrical circuit to prevent unauthorised use of that electrical circuit.

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  • Rectifiers (AREA)
  • Electrotherapy Devices (AREA)
EP19890308678 1988-08-26 1989-08-25 Circuit de commande Withdrawn EP0356260A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AU72/88 1988-08-26
AUPJ007288 1988-08-26
AU4138/88 1989-05-12
AUPJ413888 1989-05-12

Publications (2)

Publication Number Publication Date
EP0356260A2 true EP0356260A2 (fr) 1990-02-28
EP0356260A3 EP0356260A3 (fr) 1991-08-21

Family

ID=25643534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890308678 Withdrawn EP0356260A3 (fr) 1988-08-26 1989-08-25 Circuit de commande

Country Status (1)

Country Link
EP (1) EP0356260A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2711738A1 (fr) * 1993-10-21 1995-05-05 Honda Motor Co Ltd Dispositif de commande d'allumage.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3131715A1 (de) * 1981-08-11 1983-03-03 Wegmann & Co, 3500 Kassel Elektrische abfeuervorrichtung fuer waffensysteme
US4546266A (en) * 1983-07-28 1985-10-08 Zenick Walter N Magnetically actuated interlock
FR2583688B1 (fr) * 1985-06-24 1987-09-04 Colombi Jean Claude Equipement de securite interdisant l'usage non autorise ou le vol d'un vehicule a moteur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2711738A1 (fr) * 1993-10-21 1995-05-05 Honda Motor Co Ltd Dispositif de commande d'allumage.

Also Published As

Publication number Publication date
EP0356260A3 (fr) 1991-08-21

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