EP1086477B1 - Circuit d'entree pour signaux de courant alternatif a intensite relativement elevee a surveiller - Google Patents

Circuit d'entree pour signaux de courant alternatif a intensite relativement elevee a surveiller Download PDF

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Publication number
EP1086477B1
EP1086477B1 EP00925159A EP00925159A EP1086477B1 EP 1086477 B1 EP1086477 B1 EP 1086477B1 EP 00925159 A EP00925159 A EP 00925159A EP 00925159 A EP00925159 A EP 00925159A EP 1086477 B1 EP1086477 B1 EP 1086477B1
Authority
EP
European Patent Office
Prior art keywords
input
monitored
discharge
resistor
supply voltage
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
EP00925159A
Other languages
German (de)
English (en)
Other versions
EP1086477A1 (fr
Inventor
Horea-Stefan Culca
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.)
Eaton Industries GmbH
Original Assignee
Moeller GmbH
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Filing date
Publication date
Application filed by Moeller GmbH filed Critical Moeller GmbH
Publication of EP1086477A1 publication Critical patent/EP1086477A1/fr
Application granted granted Critical
Publication of EP1086477B1 publication Critical patent/EP1086477B1/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
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/16—Indicators for switching condition, e.g. "on" or "off"
    • H01H9/167—Circuits for remote indication

Definitions

  • the invention relates to an input circuit for relatively high-current alternating voltage signals to be monitored, which are to be monitored in particular with regard to a predefinable amplitude threshold values.
  • Such input circuits are used for example in small controls.
  • Input circuits for monitoring AC signals are well known, mention may be made here by way of example the document FR 2 671 437 A1.
  • some devices to be monitored such as glow-lamp-equipped switches or proximity-type initiators, require higher input currents to the input circuit for proper operation.
  • the disadvantage of this solution is that when the device to be monitored is switched off in the region of the vertex of its AC supply voltage, the capacitor can only discharge relatively slowly via the high-impedance input resistor, starting from a high amount.
  • a circuit arrangement for monitoring a defined amplitude threshold value of alternating voltage input signals comprising a series circuit comprising a rectifier, a voltage divider and a comparator, the rectifier having its anode at the input signal and its Cathode feeds the consisting of at least two resistors, arranged between the anode of the rectifier and ground potential voltage divider and the tap of the voltage divider is connected to the comparison input of the comparator, so that at the comparator output a first binary signal is generated, further comprising a zero crossing detector whose monitoring input with a Reference signal is connected to form a second binary signal, a zero crossing detector downstream delay stage to form a time-limited third binary n signal, and at least one edge-triggered flip-flop, the comparator output being connected to a state-controlled input of the flip-flop and the output of the delay stage being connected to an edge-triggered input of the flip-flop such that a
  • the invention is therefore based on the object to improve the input circuit in such a way that shutdowns of devices that provide a relatively high input current can be detected quickly.
  • the discharge resistor is low impedance compared to the output resistance of the device to be monitored switched off.
  • the lowering of the input voltage below the threshold value can be detected.
  • An advantageous development of the invention also consists in the common use of the switching element for several similar inputs, especially in a not too large number of inputs even when using only one common discharge resistor.
  • the discharge circuit is advantageously in a series circuit of rectifier, discharge resistor and switching element; wherein the switching element is expediently designed as a transistor.
  • the circuit arrangement according to FIG. 1 shows by way of example an indicated small controller 10 with two signal inputs 17 and 18, via which relatively high-current AC signals of two devices 1 and 2 to be monitored are fed to two corresponding input circuits 11 and 12.
  • the first device 1 is an approximation initiator, which consists essentially of the parallel connection of a first, electronic switching element S1 and coupled to this control electronics En.
  • the second device 2 is a second switching element S2 with parallel connected glow lamp G with resistor Rv.
  • the devices 1 and 2 to be monitored are fed by an AC supply voltage L1.
  • the zero potential N is used in the small controller 10 as a ground.
  • the conventionally formed input circuits 11 and 12 are consecutively composed of a capacitor C arranged between signal input 17 or 18 and zero potential N, an input resistor Re acting as a voltage divider and an input of an electronic component A, eg a comparator, supplied by this input.
  • an electronic component A eg a comparator
  • the circuit arrangement according to FIG. 3 again shows, by way of example, an indicated small controller 20 with two signal inputs 17 and 18, via which the relatively high-current AC signals of the devices 1 and 2 to be monitored are fed to two input circuits 21 and 22 according to the invention.
  • the devices 1 and 2 to be monitored are the same as in FIG. 1.
  • the input circuits 21 and 22 according to the invention have been expanded compared to the conventional input circuits 11 and 12 of FIG. 1 by a common discharge circuit 23 arranged between the signal inputs 17 and 18 and zero potential N.
  • the discharge circuit 23 consists of the series connection of a respective one of the inputs 17 and 18 associated rectifier D and a discharge resistor Rc and a common electronic switching element S3 in the form of a MOS switching transistor.
  • the switching element S3 is driven via an inverter I by a control signal M.
  • the control signal M is derived from the supply voltage L1 in such a way that it occupies high potential or low potential during the positive or negative half cycle of the supply voltage L1, that is, the state changes in the zero crossing of the supply voltage L1. (Reference is hereby made to the applicant's German patent application 197 48 633.9, which was explained in the introduction.) The second digital signal generated there corresponds to the control signal M) used here.
  • the electronic switching element S3 is blocked and conductive during the negative half cycle.
  • the potential of the supply voltage L1 reaches the input 17 or 18 unabated, because during the negative half cycle the respective diode D and during positive half cycle the switching element S3 is blocked.
  • the switching element S3 is conductive by the low potential of the control signal M after the next zero crossing of the supply voltage L1, while by the pending on the capacitor C positive Input voltage Uin (t) of the rectifier D in question remains conductive until the discharge voltage Uc (t) of the capacitor C and thus the evaluated input voltage Uin (t) within this first negative half cycle (20ms) of the supply voltage quickly below the worst case threshold voltage Usmin and thus safely sinking below the typical threshold voltage Ustyp to be detected.
  • the discharge resistor Rc has to protect the electronic switching element S3 from overloading.
  • the present invention is not limited to the embodiment described above, but also includes all the same in the context of the invention embodiments.
  • the values given for the input resistors Re and the capacitors C in FIGS. 1 and 3 are only exemplary but not untypical.
  • a common discharge resistor Rc may also be included Row is arranged with the common switching element S3, sufficient.
  • each rectifier D and each discharge resistor Rc is assigned a separate switching element.

Landscapes

  • Measurement Of Current Or Voltage (AREA)
  • Electronic Switches (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Details Of Television Scanning (AREA)
  • Protection Of Static Devices (AREA)

Claims (6)

  1. Circuit d'entrée pour des signaux courant alternatif à surveiller, comprenant une résistance d'entrée (Re) et un condenseur (C) connecté en parallèle sur le côté d'entrée, un courant d'entrée relativement élevé étant produit sur la base d'une tension d'alimentation alternative (L1) par le dispositif à surveiller déconnecté (1 ; 2), caractérisé en ce qu'un circuit de décharge (23) est en outre prévu en parallèle sur le côté d'entrée, circuit de décharge dont la résistance (Rc) est petite par rapport à la résistance d'entrée (Re), le circuit de décharge (23) comprend un élément de commutation (S3) qui est dans l'état bloqué lorsque la tension d'alimentation courante (L1) et la tension de seuil de reconnaissance (Ustyp) ont la même polarité mais qui est dans l'état passant lorsque les polarités sont opposées.
  2. Circuit d'entrée selon la revendication 1, caractérisé en ce que la résistance de décharge (Rc) a une valeur de résistance faible par rapport à la résistance de sortie du dispositif à surveiller déconnecté (1 ; 2).
  3. Circuit d'entrée selon la revendication 1 ou 2, caractérisé en ce que, dans le circuit de décharge (23), un élément de commutation commun (S3) est prévu pour des entrées de mêmes polarités (17 ; 18), dans lequel les dispositifs respectifs à surveiller (1 ; 2) sont alimentés avec la même tension d'alimentation alternative (L1).
  4. Circuit d'entrée selon la revendication 3, caractérisé en ce qu'une résistance de décharge commune (Rc) est prévue.
  5. Circuit d'entrée selon l'une des revendications 1 à 4, caractérisé en ce que le circuit de décharge (23) est composé d'un circuit série constitué par une diode (D) connectée dans le sens d'une tension de seuil (Ustyp), par la résistance (Rc) et par l'élément de commutation électronique (S3).
  6. Circuit d'entrée selon la revendication 5, caractérisé en ce que l'élément de commutation (S3) est un transistor.
EP00925159A 1999-04-14 2000-04-01 Circuit d'entree pour signaux de courant alternatif a intensite relativement elevee a surveiller Expired - Lifetime EP1086477B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19916686 1999-04-14
DE19916686A DE19916686A1 (de) 1999-04-14 1999-04-14 Eingangsschaltung für relativ hochstromige zu überwachende AC-Signale
PCT/EP2000/002924 WO2000063930A1 (fr) 1999-04-14 2000-04-01 Circuit d'entree pour signaux de courant alternatif a intensite relativement elevee a surveiller

Publications (2)

Publication Number Publication Date
EP1086477A1 EP1086477A1 (fr) 2001-03-28
EP1086477B1 true EP1086477B1 (fr) 2006-08-02

Family

ID=7904428

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00925159A Expired - Lifetime EP1086477B1 (fr) 1999-04-14 2000-04-01 Circuit d'entree pour signaux de courant alternatif a intensite relativement elevee a surveiller

Country Status (11)

Country Link
US (1) US6483379B1 (fr)
EP (1) EP1086477B1 (fr)
JP (1) JP3524878B2 (fr)
CN (1) CN1130739C (fr)
AT (1) ATE335283T1 (fr)
AU (1) AU741075B2 (fr)
DE (2) DE19916686A1 (fr)
ES (1) ES2269132T3 (fr)
PT (1) PT1086477E (fr)
WO (1) WO2000063930A1 (fr)
ZA (1) ZA200100364B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ553000A (en) * 2007-02-02 2009-09-25 Advanced Environmental Technol Switching technique for efficient electrical power utilization
EP2061127B1 (fr) * 2007-09-24 2014-06-25 Electrolux Home Products Corporation N.V. Circuit de détection et procédé de détection d'une tension d'alimentation erronée

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611162A (en) * 1970-07-09 1971-10-05 Yokogawa Electric Works Ltd Apparatus for detecting abnormal conditions of ac sources
US4000455A (en) * 1974-12-23 1976-12-28 Westinghouse Electric Corporation Fast current measurement apparatus for static VAR generator compensator control circuit and method for using same
US4047097A (en) * 1976-04-15 1977-09-06 Westinghouse Electric Corporation Apparatus and method for transient free energization and deenergization of static VAR generators
US4245150A (en) * 1979-02-26 1981-01-13 International Business Machines Corporation Power line disturbance detector circuit
FR2493527A1 (fr) * 1980-11-06 1982-05-07 Alsthom Atlantique Dispositif pour l'elimination rapide des charges piegees dans un pont diviseur capacitif utilise pour la surveillance des tensions alternatives elevees
FR2671437A1 (fr) * 1991-01-04 1992-07-10 Lecointe Didier Dispositif pour delester les installations electriques basse tension soumises a des dimensions.
GB9106372D0 (en) 1991-03-26 1991-05-15 Thomson Consumer Electronics Microcomputer reset circuit
US5394028A (en) * 1992-06-26 1995-02-28 Motorola, Inc. Apparatus for transitioning between power supply levels
US6177803B1 (en) * 1995-06-07 2001-01-23 Doble Engineering Company Monitoring elements in a multi-phase alternating current network
KR0171857B1 (ko) * 1996-06-29 1999-05-01 김광호 전원 공급 제어 회로 및 방법
EP0825589B1 (fr) * 1996-08-07 2002-12-04 STMicroelectronics S.r.l. Démodulateur d'asservissement de précision
US6094095A (en) * 1998-06-29 2000-07-25 Cypress Semiconductor Corp. Efficient pump for generating voltages above and/or below operating voltages

Also Published As

Publication number Publication date
CN1300439A (zh) 2001-06-20
CN1130739C (zh) 2003-12-10
WO2000063930A1 (fr) 2000-10-26
ATE335283T1 (de) 2006-08-15
DE19916686A1 (de) 2000-10-19
ES2269132T3 (es) 2007-04-01
ZA200100364B (en) 2001-10-22
AU741075B2 (en) 2001-11-22
AU4397800A (en) 2000-11-02
JP2002542497A (ja) 2002-12-10
PT1086477E (pt) 2006-12-29
JP3524878B2 (ja) 2004-05-10
EP1086477A1 (fr) 2001-03-28
DE50013258D1 (de) 2006-09-14
US6483379B1 (en) 2002-11-19

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