EP0623943A1 - Endstufenrelaismatrix mit Fehlererkennungs- und Übertragungsfunktionen - Google Patents

Endstufenrelaismatrix mit Fehlererkennungs- und Übertragungsfunktionen Download PDF

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Publication number
EP0623943A1
EP0623943A1 EP94105339A EP94105339A EP0623943A1 EP 0623943 A1 EP0623943 A1 EP 0623943A1 EP 94105339 A EP94105339 A EP 94105339A EP 94105339 A EP94105339 A EP 94105339A EP 0623943 A1 EP0623943 A1 EP 0623943A1
Authority
EP
European Patent Office
Prior art keywords
circuit
relay
detection
current
relay terminal
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.)
Granted
Application number
EP94105339A
Other languages
English (en)
French (fr)
Other versions
EP0623943B1 (de
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
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 Omron Corp, Omron Tateisi Electronics Co filed Critical Omron Corp
Publication of EP0623943A1 publication Critical patent/EP0623943A1/de
Application granted granted Critical
Publication of EP0623943B1 publication Critical patent/EP0623943B1/de
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.
  • 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 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 of this invention 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.
  • Another advantage is that a wide range of currents can be detected and that signal indicating that a relay has malfunctioned can be transmitted to a programmable controller or other device. Another advantage of this invention is that a malfunction of a relay can be reported on site without increasing the number of components required.
  • the malfunction detection function of this invention 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 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 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.
  • 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 D16, D17, D18 and D19 from transmission control circuit 4 and transmits them to relay coils 51, 52, 53, and 54, respectively; current detection coils 91, 92, 93, and 94, which are connected in series with relay contacts 71, 72, 73, and 74 and connected to load circuits 81, 82, 83, and 84, respectively; current detection circuit 10, which detects the magnetic flux generated in detection coils 91, 92, 93, and 94 and outputs signals D0, D1, D2, and D3 to indicate the presence or absence of a current in load circuits 81, 82, 83, and 84; LEDs
  • Current detection circuit 10 comprises four independent circuits corresponding to detection coils 91, 92, 93, and 94, 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 Q1, whose emitter is connected to Hall element HE and whose collector is connected to the +5V power supply; resistor R1, one of whose terminals is connected to the +5V power supply; and resistor R2, one of whose terminals is connected to the other terminal of resistor R1 at the connection point for the base of transistor Q1, and the other of whose terminals is connected to the power supply at the 0V level.
  • the ratio for resistors R1 and R2 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 R3, R4, R5, and R6, 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 R6.
  • Comparator circuit 24 comprises the series circuit comprising resistors R7, R8, R9, and R10, connected to the power supply between the +5V and 0V levels, which supply reference voltages VR1, and VR2; 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 R7 and R8, the reference voltage VR1; operational amplifier 31, whose non-inverting input terminal is connected the connection points of resistors R9 and R10, the reference voltage VR2 (VR1 > VR2) 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, achieved as described above, comprises signals D0, D1, D2, and D3, which indicate the presence or absence of a current in load circuits 81, 82, 83, and 84. These signals are input into transmission control circuit 4.
  • transmission control circuit 4 logic processing is performed on signals D0, D1, D2, and D3 received from circuit detection circuit 10 and on relay coil outputs D16, D17, D18, and D19, 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 D16, D17, D18, and D19 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 arc shown in Fig. 5.
  • Fig. 9 shows the waveforms for the case in which the circuit is shorted.

Landscapes

  • Relay Circuits (AREA)
  • Electronic Switches (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
EP19940105339 1993-04-06 1994-04-06 Endstufenrelaismatrix mit Fehlererkennungs- und Übertragungsfunktionen Expired - Lifetime EP0623943B1 (de)

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)

Publication Number Publication Date
EP0623943A1 true EP0623943A1 (de) 1994-11-09
EP0623943B1 EP0623943B1 (de) 1997-08-20

Family

ID=13662136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940105339 Expired - Lifetime EP0623943B1 (de) 1993-04-06 1994-04-06 Endstufenrelaismatrix mit Fehlererkennungs- und Übertragungsfunktionen

Country Status (3)

Country Link
EP (1) EP0623943B1 (de)
JP (1) JPH06295652A (de)
DE (1) DE69405043D1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008080065A1 (en) * 2006-12-21 2008-07-03 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
CN103631293A (zh) * 2012-08-27 2014-03-12 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
CN103838289A (zh) * 2014-03-13 2014-06-04 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
US10726647B2 (en) 2017-03-13 2020-07-28 Cnh Industrial America Llc Fault detection system for an agricultural machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6383670B1 (en) 1999-10-06 2002-05-07 Idatech, Llc System and method for controlling the operation of a fuel processing system
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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157054A1 (de) * 1984-01-23 1985-10-09 Duraplug Electricals Limited Reststromschalter
GB2157903A (en) * 1984-04-24 1985-10-30 Plessey Co Plc Lamp monitoring apparatus
FR2565430A1 (fr) * 1984-06-04 1985-12-06 Shinko Electric Co Ltd Circuit detectant une panne de relais
EP0359566A2 (de) * 1988-09-14 1990-03-21 Matsushita Electric Works, Ltd. Ein/Ausgaberelais für einen Schnittstellenbaustein
DE9113081U1 (de) * 1991-10-21 1991-12-12 Siemens Ag, 8000 Muenchen, De
DE4112996A1 (de) * 1991-04-20 1992-10-22 Bosch Gmbh Robert Vorrichtung und verfahren zur funktionsueberwachung eines elektrischen verbrauchers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157054A1 (de) * 1984-01-23 1985-10-09 Duraplug Electricals Limited Reststromschalter
GB2157903A (en) * 1984-04-24 1985-10-30 Plessey Co Plc Lamp monitoring apparatus
FR2565430A1 (fr) * 1984-06-04 1985-12-06 Shinko Electric Co Ltd Circuit detectant une panne de relais
EP0359566A2 (de) * 1988-09-14 1990-03-21 Matsushita Electric Works, Ltd. Ein/Ausgaberelais für einen Schnittstellenbaustein
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 Muenchen, De

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008080065A1 (en) * 2006-12-21 2008-07-03 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
US7692903B2 (en) 2006-12-21 2010-04-06 General Electric Company Apparatus and method for controlling a circuit breaker trip device
CN103631293A (zh) * 2012-08-27 2014-03-12 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
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
CN103838289A (zh) * 2014-03-13 2014-06-04 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
US10726647B2 (en) 2017-03-13 2020-07-28 Cnh Industrial America Llc Fault detection system for an agricultural machine

Also Published As

Publication number Publication date
JPH06295652A (ja) 1994-10-21
EP0623943B1 (de) 1997-08-20
DE69405043D1 (de) 1997-09-25

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