EP0161351A1 - An auxiliary circuit in a circuitry comprising C-MOS integrated circuit components - Google Patents

An auxiliary circuit in a circuitry comprising C-MOS integrated circuit components Download PDF

Info

Publication number
EP0161351A1
EP0161351A1 EP84200734A EP84200734A EP0161351A1 EP 0161351 A1 EP0161351 A1 EP 0161351A1 EP 84200734 A EP84200734 A EP 84200734A EP 84200734 A EP84200734 A EP 84200734A EP 0161351 A1 EP0161351 A1 EP 0161351A1
Authority
EP
European Patent Office
Prior art keywords
circuit
voltage
components
auxiliary
current
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Withdrawn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
EP84200734A
Other languages
German (de)
French (fr)
Inventor
Albert Oost
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.)
Furigas Bv
Original Assignee
Furigas Bv
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 Furigas Bv filed Critical Furigas Bv
Priority to EP84200734A priority Critical patent/EP0161351A1/en
Publication of EP0161351A1 publication Critical patent/EP0161351A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
    • G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
    • G05F1/573—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector

Definitions

  • the invention relates to a circuit comprising one or more IC-components of the C-MOS type, means being provided to detect failures in the components of the circuit.
  • Such circuits are generally used in control-circuits of (control) processes of various nature.
  • control circuits for an electronic burner-ignition device.
  • the so-called double 'fail-safe'-principle may be used as a provision for detecting failures in the components of the circuit.
  • This principle means that two identical circuits must be provided, connected in parallel, in which the outputs of the corresponding sections of the circuits are compared by a comparator and in which a signal, unequal to zero, is considered as a failure.
  • One of the parallel connected circuits may be considered as the proper control-circuit, while the other performs the function of a comparing-circuit.
  • a disadvantage of this principle is, that the failure-chance is doubled, while both circuits are to be adjusted precisely one with respect to the other.
  • this detection principle involves substantial increase of the cost price in comparison with a single circuit.
  • the invention aims at overcoming the above-mentioned disadvantage and for this purpuse it makes use of the property, that the IC's of the C-MOS type, applied in the circuit, have a low and controlled current-collection and that a failure of such an IC is expressed in a significant increase of the current-collection.
  • the "fail safe"-circuit proposed by the invention is characterized by auxiliary circuit for detecting failures, which is adapted to monitor the current-collection by the circuit, and to generate a failure-signal, as soon as the monitored current-collection exceeds a pre-adjusted threshold- level.
  • the auxiliary circuit may be realised in a simple and inexpensive way.
  • the auxiliary circuit includes a voltage- regulator, having its control-input connected to a thyristor, by which the voltage-regulator may be switched on and off respectively; a transistor with an adjustment-circuit, adapted to make the transistor issue a signal,as soon as the current-collection by the circuit exceeds a pre-adjusted threshold- level, resulting in the voltage-regulator and the power-supply of the circuit being switched off.
  • the components of the auxiliary circuit are selected and connected in such a way, that in the event of a failure in one of the components of the auxiliary circuit, the power-supply of the circuit will be switched off in the same way, as described above with reference to the main circuit.
  • the circuit shown in the drawing is supplied by a supply-voltage V 0 , which in praxis may have a value between 15 and 24V.
  • the voltage V 0 is transferred to a fixed voltage of 12V by the voltage-regulator IC 1 and the resistors R I and R 4 .
  • the resistors R 1 and R 4 are selected in such a way, that there will be a voltage V 2 of 10,8V across the resistor R 1 .
  • the capacitor C 3 Upon the supply-voltage V 0 being switched on, the capacitor C 3 will cause the volt a ge V 1 to increase slowly to a value of 12V.
  • the voltage V 1 is supplied to a 12V failure-relay, so as to energize the latter.
  • the voltage V 1 is also connected to the positive supply-terminal of the circuit X, via resistor R 5 .
  • the circuit X comprises logic IC's of the C-MOS type.
  • the negative supply-terminal of the circuit X is connected to the zero voltage of the power-supply.
  • the voltage difference V E -V B between the emitter and base of the transistor Tr will than be much smaller than 1V, due to which the transistor Tr will be in its blockingstate. There will be no collectorcurrent I C tlowing.
  • the diode D 2 (in this example used as a zener of 0,7V) is applied to get a better adjustment of the voltage V E and of the threshold-level, at which the transistor Tr begins to conduct.
  • the gate-current I G to the thyristor Th received from circuit X through the resistors R 2 and R 3 is below the threshold-level, at which the thyristor begins to conduct, sothat the thyristor Th is blocked.
  • the current-flow I 1 will increase to a value far above 1000 A.
  • the voltage-drop across resistor R 5 will increase to such an extent, that the base-voltage V B of the transistor will become at least 0,6V below the emitter-voltage V E , sothat the transistor Tr will get in the conduction-state.
  • a current I C begins to flow, which controls the thyristor Th, via the current-divider achieved by the resistors R 3 and R 2 .
  • the current-divider R 3 , R 2 ensures that the inputcurrent of the thyristor Th, which is applied via transistor Tr from the 12V power-supply, will not become too high.
  • the gate-current I G will now have a value above the threshold-level, at which the thyristor gets in the conduction-state; thus the thysristor Th begins to conduct.
  • the capacitor C 1 ensures that the transistor Tr will put enough energy into the gate of Th, sothat the thyristor Th will get into conduction immediately and without oscillation-phenomena.
  • the resistor R 1 is now short circuited by the thyristor Th, due to which the output-voltage V 1 of the voltageregulator decreases rapidly to 1,2V.
  • the power-supply of the circuit X is thereby interrupted.
  • the decrease of V causes the failure-relay (12V),fed by the voltage V 1 , to drop, and this may control a secundairy circuit, indicating a failure in the circuit X, for example by means of a sound-or lightsignal.
  • the auxiliary circuit further comprises a zenerdiode D 1 of 15V and a capacitor C 2 .
  • the capacitor C 2 provides that the currentpulses caused by switching-actions in the circuit X will not cause the transistor Tr to come into conduction, sothat false control-signals to the thyristor Th are avoided.
  • the zenerdiode D 1 contributes a protection against a too high value of the supply-voltage V 1 . When the voltage V 1 becomes too high, the diode D 1 controls the thyristor Th, due to which the latter Th gets into conduction and the supply-voltage will be interrupted.
  • the thyristor may be reset into the blocking-state by depressing a reset-button, which will short circuit the thyristor, whereafter the voltage V I may rise again to 12v, as soon as the reset-button is released.
  • auxiliary circuit according to the invention is applicable in circuits for various purposes and that the values of the components of the implementation shown are used for illustration only.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electronic Switches (AREA)

Abstract

Detection of failures in an electronic circuit (x), comprising one or more integrated-circuit components of the C-MOS type. For this detection-method an auxiliary circuit (Tr, Th) is provided, which is appropriate for monitoring the current-collection (I1) by the circuit and generating a failure-signal, as soon as the monitored current-collection exceeds a pre-adjusted thresholdlevel.

Description

  • The invention relates to a circuit comprising one or more IC-components of the C-MOS type, means being provided to detect failures in the components of the circuit.
  • Such circuits are generally used in control-circuits of (control) processes of various nature. As an example, reference may be made to a control circuit for an electronic burner-ignition device.
  • The so-called double 'fail-safe'-principle may be used as a provision for detecting failures in the components of the circuit. This principle means that two identical circuits must be provided, connected in parallel, in which the outputs of the corresponding sections of the circuits are compared by a comparator and in which a signal, unequal to zero, is considered as a failure. One of the parallel connected circuits may be considered as the proper control-circuit, while the other performs the function of a comparing-circuit. A disadvantage of this principle is, that the failure-chance is doubled, while both circuits are to be adjusted precisely one with respect to the other. In addition, this detection principle involves substantial increase of the cost price in comparison with a single circuit.
  • The invention aims at overcoming the above-mentioned disadvantage and for this purpuse it makes use of the property, that the IC's of the C-MOS type, applied in the circuit, have a low and controlled current-collection and that a failure of such an IC is expressed in a significant increase of the current-collection.
  • The "fail safe"-circuit proposed by the invention is characterized by auxiliary circuit for detecting failures, which is adapted to monitor the current-collection by the circuit, and to generate a failure-signal, as soon as the monitored current-collection exceeds a pre-adjusted threshold- level.
  • The said auxiliary circuit may be realised in a simple and inexpensive way. In a practical embodiment, the auxiliary circuit includes a voltage- regulator, having its control-input connected to a thyristor, by which the voltage-regulator may be switched on and off respectively; a transistor with an adjustment-circuit, adapted to make the transistor issue a signal,as soon as the current-collection by the circuit exceeds a pre-adjusted threshold- level, resulting in the voltage-regulator and the power-supply of the circuit being switched off.
  • Prefarebly, the components of the auxiliary circuit are selected and connected in such a way, that in the event of a failure in one of the components of the auxiliary circuit, the power-supply of the circuit will be switched off in the same way, as described above with reference to the main circuit.
  • The invention will be hereinafter further described with reference to the drawing, in which a practical embodiment of the auxiliary circuit is shown.
  • The circuit shown in the drawing is supplied by a supply-voltage V0, which in praxis may have a value between 15 and 24V. The voltage V0 is transferred to a fixed voltage of 12V by the voltage-regulator IC1 and the resistors RI and R4. The resistors R1 and R4 are selected in such a way, that there will be a voltage V2 of 10,8V across the resistor R1. Upon the supply-voltage V0 being switched on, the capacitor C3 will cause the voltage V1 to increase slowly to a value of 12V. The voltage V1 is supplied to a 12V failure-relay, so as to energize the latter. The voltage V1 is also connected to the positive supply-terminal of the circuit X, via resistor R5. The circuit X comprises logic IC's of the C-MOS type. The negative supply-terminal of the circuit X is connected to the zero voltage of the power-supply. Under normal conditions, i.e. without failures in the components, the current-flow I1 received by the circuit X will be very small. The voltage difference VE-VB between the emitter and base of the transistor Tr will than be much smaller than 1V, due to which the transistor Tr will be in its blockingstate. There will be no collectorcurrent IC tlowing. The diode D2 (in this example used as a zener of 0,7V) is applied to get a better adjustment of the voltage VE and of the threshold-level, at which the transistor Tr begins to conduct. The gate-current IG to the thyristor Th received from circuit X through the resistors R2 and R3 is below the threshold-level, at which the thyristor begins to conduct, sothat the thyristor Th is blocked.
  • As soon as a failure appears in the circuit X the current-flow I1 will increase to a value far above 1000 A. The voltage-drop across resistor R5 will increase to such an extent, that the base-voltage VB of the transistor will become at least 0,6V below the emitter-voltage VE, sothat the transistor Tr will get in the conduction-state. As a result of this a current IC begins to flow, which controls the thyristor Th, via the current-divider achieved by the resistors R3 and R2. The current-divider R3, R2 ensures that the inputcurrent of the thyristor Th, which is applied via transistor Tr from the 12V power-supply, will not become too high. The gate-current IG will now have a value above the threshold-level, at which the thyristor gets in the conduction-state; thus the thysristor Th begins to conduct. The capacitor C1 ensures that the transistor Tr will put enough energy into the gate of Th, sothat the thyristor Th will get into conduction immediately and without oscillation-phenomena. The resistor R1 is now short circuited by the thyristor Th, due to which the output-voltage V1 of the voltageregulator decreases rapidly to 1,2V. The power-supply of the circuit X is thereby interrupted. The decrease of V causes the failure-relay (12V),fed by the voltage V1, to drop, and this may control a secundairy circuit, indicating a failure in the circuit X, for example by means of a sound-or lightsignal.
  • The auxiliary circuit further comprises a zenerdiode D1 of 15V and a capacitor C2. The capacitor C2 provides that the currentpulses caused by switching-actions in the circuit X will not cause the transistor Tr to come into conduction, sothat false control-signals to the thyristor Th are avoided. The zenerdiode D1 contributes a protection against a too high value of the supply-voltage V1. When the voltage V1 becomes too high, the diode D1 controls the thyristor Th, due to which the latter Th gets into conduction and the supply-voltage will be interrupted. Upon removal of the failure in the circuit X the thyristor may be reset into the blocking-state by depressing a reset-button, which will short circuit the thyristor, whereafter the voltage VI may rise again to 12v, as soon as the reset-button is released.
  • It is an advantage of the above auxiliary circuit that in case of failures in the components of the auxiliary circuit itself(appearing as an interruption or short-circuiting), a similar effect will occur, as described above with reference to failures in the components of the circuit X. The supply-voltage of the circuit X will then also be interrupted.
  • It may be understood, that the auxiliary circuit according to the invention is applicable in circuits for various purposes and that the values of the components of the implementation shown are used for illustration only.

Claims (3)

1.Circuit comprising one or more integrated-circuit components of the C-MOS type, characterized by an auxiliary circuit for the detection of failures, which is adapted to monitor the current-collection by the circuit and to generate a failure-signal, as soon as the monitored currant- collection exceeds a pre-adjusted threshold-level.
2. Circuit according to claim 1, characterized in that the auxiliary circuit includes a voltage-regulator, having its control-input connected to a thyristor, by which the voltage-regulator may be switched on and off respectively; a transistor with an adjustment-circuit, adapted to make the transistor issue a signal, as soon as the current-collection by the circuit exceeds a pre-adjusted threshold-level, resulting in tne voltage- regulator and the supply-voltage of the circuit being switched off.
3. Circuit according to claims I and 2, characterized in that the components of the auxiliary circuit are selected and connected in such a way, that, in the event of a failure in one of the components of the auxiliary circuit, the power-supply of the circuit will be switched off in the same way, as described above with reference to the circuit itself.
EP84200734A 1984-05-18 1984-05-18 An auxiliary circuit in a circuitry comprising C-MOS integrated circuit components Withdrawn EP0161351A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP84200734A EP0161351A1 (en) 1984-05-18 1984-05-18 An auxiliary circuit in a circuitry comprising C-MOS integrated circuit components

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84200734A EP0161351A1 (en) 1984-05-18 1984-05-18 An auxiliary circuit in a circuitry comprising C-MOS integrated circuit components

Publications (1)

Publication Number Publication Date
EP0161351A1 true EP0161351A1 (en) 1985-11-21

Family

ID=8192440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84200734A Withdrawn EP0161351A1 (en) 1984-05-18 1984-05-18 An auxiliary circuit in a circuitry comprising C-MOS integrated circuit components

Country Status (1)

Country Link
EP (1) EP0161351A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016006360A (en) * 2014-06-20 2016-01-14 パナソニックＩｐマネジメント株式会社 Gas shutoff device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3359434A (en) * 1965-04-06 1967-12-19 Control Data Corp Silicon controlled rectifier arrangement for improved shortcircuit protection
US3373341A (en) * 1964-05-18 1968-03-12 Bendix Corp Electrical network for preventing excessive load current
DE2049532B2 (en) * 1969-10-08 1973-02-08 OVERCURRENT PROTECTION DEVICE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3373341A (en) * 1964-05-18 1968-03-12 Bendix Corp Electrical network for preventing excessive load current
US3359434A (en) * 1965-04-06 1967-12-19 Control Data Corp Silicon controlled rectifier arrangement for improved shortcircuit protection
DE2049532B2 (en) * 1969-10-08 1973-02-08 OVERCURRENT PROTECTION DEVICE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016006360A (en) * 2014-06-20 2016-01-14 パナソニックＩｐマネジメント株式会社 Gas shutoff device

Similar Documents

Publication Publication Date Title
US4433390A (en) Power processing reset system for a microprocessor responding to sudden deregulation of a voltage
US4428020A (en) Power supply sensing circuitry
US4977375A (en) Fan operating status sensing circuit
US5618460A (en) Temperature regulating control system for an oven of a cooking apparatus and methods of making and operating the same
US5046149A (en) Inflatable restraint firing circuit diagnostics
US4791311A (en) Two-terminal multiplexable sensor
US5446451A (en) On board hot bearing detector system with fault detection
US5461358A (en) Resistance measurement circuit for external deployment path of sir system
US4510549A (en) Power supply voltage monitor and control system
JPH0523631B2 (en)
KR880701029A (en) Electric circuit protection device and method
US5039931A (en) 12 Volt battery charger circuit
EP0161351A1 (en) An auxiliary circuit in a circuitry comprising C-MOS integrated circuit components
US3918043A (en) Power supply monitor
US4220909A (en) Half-wave regulator rectifier for an alternator
US3026505A (en) Unijunction transistor oscillator voltage monitoring circuit
US4346371A (en) Alarm circuit
US4517618A (en) Protection circuitry for high voltage drivers
US4467391A (en) Monitor for an electrically-controlled system
US4438384A (en) Generation indicating apparatus for vehicle alternators
US5196832A (en) Electric power system with line failure detection
US4685052A (en) Pulse train presence detector
JP3144120B2 (en) Bumper collision detection device
JPH0143650Y2 (en)
KR940002333Y1 (en) Control circuit of power supply

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR GB IT NL

17P Request for examination filed

Effective date: 19860521

17Q First examination report despatched

Effective date: 19880217

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19890120

RIN1 Information on inventor provided before grant (corrected)

Inventor name: OOST, ALBERT