EP0623943B1 - Ensemble de relais de sortie avec des fonctions de détection d'erreur et de transmission - Google Patents

Ensemble de relais de sortie avec des fonctions de détection d'erreur et de transmission Download PDF

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Publication number
EP0623943B1
EP0623943B1 EP19940105339 EP94105339A EP0623943B1 EP 0623943 B1 EP0623943 B1 EP 0623943B1 EP 19940105339 EP19940105339 EP 19940105339 EP 94105339 A EP94105339 A EP 94105339A EP 0623943 B1 EP0623943 B1 EP 0623943B1
Authority
EP
European Patent Office
Prior art keywords
circuit
relay
current
relay terminal
detection
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
EP19940105339
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German (de)
English (en)
Other versions
EP0623943A1 (fr
Inventor
Teruhiko C/O Omron Corp. Fujiwara
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.)
Omron Corp
Original Assignee
Omron Corp
Omron Tateisi Electronics Co
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Filing date
Publication date
Application filed by Omron Corp, Omron Tateisi Electronics Co filed Critical Omron Corp
Publication of EP0623943A1 publication Critical patent/EP0623943A1/fr
Application granted granted Critical
Publication of EP0623943B1 publication Critical patent/EP0623943B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H47/002—Monitoring or fail-safe circuits

Definitions

  • This invention concerns a relay terminal which is capable of transmitting detection signals when malfunctions are detected in the relay load circuits.
  • a conventional relay terminal array consists of a number of relays whose contacts are connected to load circuits. Each load circuit is switched on or off in accordance with the contact state of the relay coil. Some conventional relay terminals are not able to transmit signals whether or not there is contact while other conventional relay terminals can. Conventional relay terminals of the type described above, however, cannot detect malfunctions. When such a relay becomes fused or a contact becomes intermittent, the malfunction cannot be immediately detected in the control center. The delay in detecting the malfunctioning relay causes down time and other problems.
  • a relay terminal array having a plurality of relays, each of said plurality of relays having a relay coil such that excitation of said relay coil causes a relay contact, said relay terminal array comprising: a current detection circuit for detecting the presence or absence of a current in a load circuit of said relays and outputting detection signals, and a transmission control circuit for comparing said detection signals from said current detection circuit with a state signal from each of said relay coils, to determine if a malfunction has occurred in said relays, said transmission control circuit outputting a malfunction detection signal when a malfunction has occurred.
  • FR-A-2 565 430 discloses a relay terminal having a relay coil such that excitation of said relay coil causes a relay contact, said relay terminal comprising: a current detection circuit for detecting the presence or absence of a current in a load circuit of said relay and outputting detection signals, and a transmission control circuit for comparing said detection signals from said current detection circuit with a state signal from said relay coil, to determine if a malfunction has occurred in said relay, said transmission control circuit outputting a malfunction detection signal when a malfunction has occurred.
  • This invention considers the problem described above.
  • One advantage of this invention that the relay terminal array is capable of detecting malfunctions and transmitting the status of the relay terminal to the main control unit.
  • This invention in an embodiment, provides a number of other advantages.
  • This invention uses a magneto-electric converter element to detect the presence or absence of current in a load circuit.
  • an advantage is that a determination whether or not a malfunction has occurred is made based on the logic state of a current detection circuit and the result of processing performed on an output indicating the state of a relay coil.
  • the malfunction detection function can be disabled.
  • a further advantage of this invention is that the user can enable or disable the detection function, as needed, in response to the load being used.
  • the relay terminal array according to the invention is defined in claim 1.
  • the relay terminal array of this invention comprises a number of relays in which the excitation of the relay coil of each relay causes the relay contact, which is connected to a load circuit, to be made or broken.
  • Each of the relays has a current detection unit comprising, in an embodiment, a detection coil serially connected to its associated load circuit; a magneto-electric converter element to detect the presence of magnetic flux which is generated by an electric current flowing through the detection coil; and a current detection circuit which outputs a signal representing a logic state.
  • the current detection unit can detect a malfunction in any of the relays. If a malfunction is detected, the current detection unit outputs a signal indicating that a malfunction has occurred.
  • the relay terminal array also has a transmitting unit to transmit the state of the relay whether a malfunction has occurred. The transmitting unit receives the output of the current detection unit and outputs an output signal to, for example, a monitoring center for the system.
  • the processor will conclude that the load circuit is normal.
  • a signal indicating that a malfunction has or has not occurred is transmitted to the exterior, for example, to a programmable controller.
  • An open relay detection switch for preventing said transmission control circuit from outputting said malfunction signal is provided.
  • Fig. 1 is a block diagram showing a relay terminal array of this invention.
  • This relay terminal array comprises power supply circuit 1; reset circuit 2; driver/receiver circuit 3, which sends data to and receives data from a programmable controller; transmission control circuit 4; output circuit 6, which receives relay coil outputs D 16 , D 17 , D 18 and D 19 from transmission control circuit 4 and transmits them to relay coils 5 1 , 5 2 , 5 3 , and 5 4 , respectively; current detection coils 9 1 , 9 2 , 9 3 , and 9 4 , which are connected in series with relay contacts 7 1 , 7 2 , 7 3 , and 7 4 and connected to load circuits 8 1 , 8 2 , 8 3 , and 8 4 , respectively; current detection circuit 10, which detects the magnetic flux generated in detection coils 9 1 , 9 2 , 9 3 , and 9 4 and outputs signals D 0 , D 1 , D 2 , and
  • Current detection circuit 10 comprises four independent circuits corresponding to detection coils 9 1 , 9 2 , 9 3 , and 9 4 , which are connected in series with their corresponding load circuits.
  • Transmission control circuit 4 receives the signals representing the presence or absence of current in the load circuits which are output by current detection circuit 10. It processes these signals together with the state of the relay coils to determine whether or not a malfunction has occurred.
  • a malfunctioning relay When a malfunctioning relay is detected, its corresponding display means, one of LED3, LED4, LED5, and LED6, will flash on and off, and a signal indicating that the relay is malfunctioning (its corresponding flag) will be transmitted to the programmable controller via driver/receiver 3.
  • Fig. 2 is a circuit diagram of an example of a circuit for the current detection circuit 10.
  • This circuit comprises magnetic flux detection circuit 21, which contains Hall element HE to detect magnetic flux in detection coil 9; constant voltage circuit 22, which provides drive voltage to Hall element HE at a constant level of 1V; amplifier circuit 23, which amplifies the output of Hall element HE; comparator circuit 24, which compares the amplified signal with a reference voltage and whose output is "HIGH” in the presence of a current and is "LOW” in the absence of a circuit; and smoothing circuit 25, which smooths the output signal when an AC load is being used.
  • Detection coil 9 which is connected to load circuit 8 serially, is wound on a ring core with a gap.
  • Hall element HE in magnetic flux detection circuit 21 measures the magnetic flux generated by the current outputs the voltage generated by the load current.
  • Constant-voltage circuit 22 comprises transistor Q 1 , whose emitter is connected to Hall element HE and whose collector is connected to the +5V power supply; resistor R 1 , one of whose terminals is connected to the +5V power supply; and resistor R 2 , one of whose terminals is connected to the other terminal of resistor R 1 at the connection point for the base of transistor Q 1 , and the other of whose terminals is connected to the power supply at the 0V level.
  • the ratio for resistors R 1 and R 2 is set so that a voltage of 1V is applied to Hall element HE.
  • Amplifier circuit 23 has a differential amplifier unit 27 comprising resistors R 3 , R 4 , R 5 , and R 6 , operational amplifier 26; and operational amplifier 28.
  • the output terminal of operational amplifier 28 and the inverting input terminal are connected to form a voltage follower, which is connected to one of the terminals of resistor R 6 .
  • Comparator circuit 24 comprises the series circuit comprising resistors R 7 , R 8 , R 9 , and R 10 , connected to the power supply between the +5V and 0V levels, which supply reference voltages VR 1 , and VR 2 ; operational amplifier 30, whose non-inverting input terminal is connected the output of amplifier circuit 23 and whose inverting input terminal is connected the common connection point of resistors R 7 and R 8 , the reference voltage VR 1 ; operational amplifier 31, whose non-inverting input terminal is connected the connection points of resistors R 9 and R 10 , the reference voltage VR 2 (VR 1 > VR 2 ) and whose inverting input terminal is connected the output of amplifier circuit 23; and OR circuit 32, which receives as input the outputs of operational amplifiers 31 and 32.
  • the output of current detection circuit 10 comprises signals D 0 , D 1 , D 2 , and D 3 , which indicate the presence or absence of a current in load circuits 8 1 , 8 2 , 8 3 , and 8 4 . These signals are input into transmission control circuit 4.
  • transmission control circuit 4 logic processing is performed on signals D 0 , D 1 , D 2 , and D 3 received from circuit detection circuit 10 and on relay coil outputs D 16 , D 17 , D 18 , and D 19 , which are output to the various relays via output circuit 6. This processing determines whether a malfunction has occurred.
  • a relay is ON, that is, if the output signal from the relay coil is "LOW", and the current detection signal (the load current) is positive (i.e., greater than 0.5A), the relay is in its normal ON state, and its LED will stay lit continuously. Waveforms for this case are shown in Fig. 4.
  • the output signals D 16 , D 17 , D 18 , and D 19 from the relay coils are "HIGH".
  • the current detection signal is negative (i.e., less than 0.5A), and LED3, LED4, LED5, and LED6 will be off.
  • the waveforms for this case are shown in Fig. 5.
  • the current flowing in the load circuit which is made or broken by the relays is relatively large. However, conditions set by the user, such as having a load which is only the display means, may cause the current to be very small. If this happens, the current detection circuit may output a "negative" signal, even though the load current is normal. An open relay malfunction is then detected when conditions are in fact normal. This circuit has a feature which allows the user to prevent such false positives. When open relay detection switches 11 1 , 11 2 , 11 3 , and 11 4 are on, the detection of open relay malfunctions will be prevented.
  • Fig. 9 shows the waveforms for the case in which the circuit is shorted.

Landscapes

  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Relay Circuits (AREA)
  • Electronic Switches (AREA)

Claims (6)

  1. Réseau de bornes de relais comportant une pluralité de relais, chacun parmi ladite pluralité de relais ayant une bobine de relais telle que l'excitation de ladite bobine de relais provoque un contact de relais, ledit réseau de bornes de relais comprenant :
    • un circuit de détection de courant (10), pour détecter la présence ou l'absence d'un courant dans un circuit de charge desdits relais, et délivrer en sortie des signaux de détection,
    • un circuit de commande de transmission (4) pour comparer lesdits signaux de détection dudit circuit de détection de courant à un signal d'état provenant de chacune desdites bobines de relais, pour déterminer si un dysfonctionnement s'est produit dans lesdits relais, ledit circuit de commande de transmission délivrant en sortie un signal de détection de dysfonctionnement lorsqu'un dysfonctionnement s'est produit, et
    • un commutateur (111, 112, 113, 114), pour empêcher ledit circuit de commande de transmission de délivrer en sortie ledit signal de dysfonctionnement.
  2. Réseau de bornes à relais selon la revendication 1, dans lequel ledit circuit de détection de courant (10) comprend :
    • un circuit de détection de flux magnétique (21), pour détecter le flux magnétique généré par ledit courant dans ledit circuit de charge, et pour délivrer en sortie un signal de détection de flux magnétique ;
    • un circuit à tension constante (22), pour fournir une tension de commande constante audit circuit de détection de flux magnétique ;
    • un circuit amplificateur (23), pour amplifier ledit signal de détection de flux magnétique provenant dudit circuit de détection de flux magnétique, et délivrer en sortie un signal de détection amplifié ; et
    • un circuit comparateur (24), pour comparer ledit signal de détection amplifié provenant dudit circuit amplificateur à une tension de référence, pour déterminer la présence ou l'absence dudit courant dans ledit circuit de charge, et délivrer en sortie un signal de détection de courant,
       dans laquelle lesdits signaux de détection comprennent ledit signal de détection de flux magnétique, ledit signal de détection amplifié et ledit signal de détection de courant.
  3. Réseau de bornes de relais selon la revendication 2, dans laquelle ledit circuit de détection de flux magnétique (21) comprend :
    • une bobine de détection (9), connectée en série audit circuit de charge dudit relais ; et
    • un élément convertisseur magnétoélectrique (HE), pour détecter le flux magnétique généré par ledit courant dans ledit circuit de charge.
  4. Réseau de bornes de relais selon la revendication 2, ledit réseau de bornes de relais comprenant en outre un circuit de lissage (25), pour lisser ledit signal de détection de courant délivré en sortie par ledit circuit comparateur (24).
  5. Réseau de bornes de relais selon l'une quelconque des revendications précédentes, ledit réseau de bornes de relais comprenant en outre une pluralité de moyens d'affichage (LED3, LED4, LED5, LED6), correspondant à ladite pluralité de relais, pour afficher le fait qu'un dysfonctionnement a eu lieu dans chacun desdits relais, lesdits moyens d'affichage étant activés par ledit signal de détection de dysfonctionnement provenant dudit circuit de commande de transmission (4).
  6. Réseau de bornes de relais selon l'une quelconque des revendications précédentes, ledit réseau de bornes de relais comprenant en outre un circuit de commande-récepteur (3), pour transmettre ledit signal de détection de dysfonctionnement à un centre de surveillance.
EP19940105339 1993-04-06 1994-04-06 Ensemble de relais de sortie avec des fonctions de détection d'erreur et de transmission Expired - Lifetime EP0623943B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5078441A JPH06295652A (ja) 1993-04-06 1993-04-06 リレーターミナル
JP78441/93 1993-04-06

Publications (2)

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EP0623943A1 EP0623943A1 (fr) 1994-11-09
EP0623943B1 true EP0623943B1 (fr) 1997-08-20

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EP (1) EP0623943B1 (fr)
JP (1) JPH06295652A (fr)
DE (1) DE69405043D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7208241B2 (en) 1999-10-06 2007-04-24 Idatech, Llc System and method for controlling the operation of a fuel processing system

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7692903B2 (en) 2006-12-21 2010-04-06 General Electric Company Apparatus and method for controlling a circuit breaker trip device
US7656641B2 (en) 2006-12-21 2010-02-02 General Electric Company Apparatus and method for controlling a solenoid
CN103631293B (zh) * 2012-08-27 2016-01-06 上海占空比电子科技有限公司 一种带功率因数校正的恒流控制电路及方法
CN103838289B (zh) * 2014-03-13 2015-10-07 绍兴光大芯业微电子有限公司 实现精准的恒流输出控制的电路结构及方法
JP5954456B1 (ja) * 2015-03-17 2016-07-20 オムロン株式会社 不正使用検出システムおよびこれを備えた電力供給装置
US10726647B2 (en) 2017-03-13 2020-07-28 Cnh Industrial America Llc Fault detection system for an agricultural machine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8401699D0 (en) * 1984-01-23 1984-02-22 Duraplug Elect Ltd Residual current circuit breakers
GB2157903B (en) * 1984-04-24 1987-06-17 Plessey Co Plc Lamp monitoring apparatus
GB2162391B (en) * 1984-06-04 1987-09-16 Shinko Electric Co Ltd Electric fault detection device
US5000692A (en) * 1988-09-14 1991-03-19 Matsushita Electric Works, Ltd. I/O relay interface module
DE4112996A1 (de) * 1991-04-20 1992-10-22 Bosch Gmbh Robert Vorrichtung und verfahren zur funktionsueberwachung eines elektrischen verbrauchers
DE9113081U1 (de) * 1991-10-21 1991-12-12 Siemens AG, 8000 München Stromsensor mit integrierter Hallschaltung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7208241B2 (en) 1999-10-06 2007-04-24 Idatech, Llc System and method for controlling the operation of a fuel processing system
US7771882B2 (en) 1999-10-06 2010-08-10 Idatech, Llc System and method for controlling the operation of a fuel processing system
US7939211B2 (en) 1999-10-06 2011-05-10 Idatech, Llc System and method for controlling the operation of a fuel processing system

Also Published As

Publication number Publication date
EP0623943A1 (fr) 1994-11-09
DE69405043D1 (de) 1997-09-25
JPH06295652A (ja) 1994-10-21

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