EP0602423B1 - Steuerungsvorrichtung für ein Betätigungselement in Waschmaschinen, insbesondere in Geschirrspülmaschinen, das ausgehend von einer Wechselspannung versorgt wird - Google Patents

Steuerungsvorrichtung für ein Betätigungselement in Waschmaschinen, insbesondere in Geschirrspülmaschinen, das ausgehend von einer Wechselspannung versorgt wird Download PDF

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Publication number
EP0602423B1
EP0602423B1 EP93118945A EP93118945A EP0602423B1 EP 0602423 B1 EP0602423 B1 EP 0602423B1 EP 93118945 A EP93118945 A EP 93118945A EP 93118945 A EP93118945 A EP 93118945A EP 0602423 B1 EP0602423 B1 EP 0602423B1
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EP
European Patent Office
Prior art keywords
actuating element
control device
washing
washing machine
control signal
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
EP93118945A
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English (en)
French (fr)
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EP0602423A1 (de
Inventor
Francescopaolo Mandara
Valter Strocco
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Bitron SpA
Original Assignee
Bitron SpA
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Publication date
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Publication of EP0602423A1 publication Critical patent/EP0602423A1/de
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Publication of EP0602423B1 publication Critical patent/EP0602423B1/de
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/46—Devices for the automatic control of the different phases of cleaning ; Controlling devices
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/10—Power supply arrangements, e.g. stand-by circuits

Definitions

  • the present invention refers to a control device of an actuating element in washing machines, particularly a dishwasher, of the type comprising an electronic control circuit and means for supplying a control signal to the actuating element.
  • actuating elements are present in domestic washing machines, such as laundry washers and dishwashers. Such actuating elements are used for activating other components being part of the washing machine and which carry out well defined functions.
  • said functional elements can be electrovalves which have to be controlled in a suitable way for providing the water supply to the washing machines; or they can be used for energizing an electromagnet which allows the release of the small lid of a washing agent dispenser, so as to cause the delivery of said agents (detergents) in the inside of a washing chamber of a washing machine.
  • Actuating elements are also used for allowing the execution of other internal functions of said washing machines.
  • one of the simplest ways for obtaining the supply voltage for said actuators is that of taking the supply from the circuit which already produces the direct current for the other electronic components, instead of specifically providing a transformer, a rectifier circuit and a filtering and stabilizing circuit of the rectified current.
  • FR-A-2 519 660 shows a control device of actuating elements in washing machines or dish-washers, which allows to interrupt electrical supply to the motor of the washing machine during an automatic selection of washing programs, so as to avoid unwanted switching between the power supply and the ground by the various actuating elements and/or to avoid unwanted developing of eddy currents and electromagnetic noises.
  • This prior art forms the preamble of independent claim 1.
  • the control device comprises a switch of a relay, which is supplied by DC electrical supply, through a bridge rectifier, that is connected in series to the motor of the washing machine.
  • the relay which has to be used, is a DC relay of 24 Volts, with an output power of about 0.3 Watts.
  • said relay has to be measured for such values of tension and power and therefore it must comprise a high value of inductance with respect to the value of impedence of the actuating elements.
  • Aim of the present invention is that of obtaining a device which does not suffer the above described drawbacks and which, in the meanwhile, results in being reliable, efficient and of low cost.
  • the present invention has for subject a control device of an actuating element in washing machine, particularly a dishwasher, according to claim 1.
  • an electric motor for the driving, by means of a pump, of the sprinklers in the inside of the washing chamber of a dishwashing machine.
  • Said motor is generally constituted by a stator element and a rotor element, in addition to a ferromagnetic core.
  • a driver transistor is indicated, the output of which (collector) is connected to relays RL1; the emitter is connected to ground and its base receives, through a resistor R16, a driving signal from a pin of a integrated electronic circuit of control (micro controller), indicated with MP.
  • a biasing resistor is connected, indicated with R17.
  • diode D2 To the anode of diode D2 the anode of a third diode indicated with D4 is connected. To the cathode of this last diode D4 the anode of a fourth diode D7 is connected, having its cathode connected to the cathode of said diode D5.
  • Said four diodes D2, D5, D4 and D7 are connected in a diode bridge configuration.
  • a terminal MT2 of an electronic switch (triac) indicated with TR1 is connected.
  • a second terminal of said triac, indicated with MT1 is connected to ground, while gate G of said triac TR1 is connected, through a resistor R14 and a capacitor C7, to one of the pins of said microcontroller MP.
  • the cathodes of said diodes D5 and D7 are connected, by means of a terminal indicated with 1, to an end of a coil indicated with EA.
  • the second end of said coil EA is connected, by means of a terminal 3, to the anodes of diodes D2 and D4. Said coil EA realizes the actuating element of the detergent dispenser of the dishwashing machine.
  • N and F refer to the electric mains supply and identify respectively phase and neutral pole of the electric supply signal.
  • the circuit operates in the following way.
  • relay RL1 appropriately energized by the microcontroller MP, allows that the electric supply coming from the two conductors N or F reaches the ends of the motor M.
  • microcontroller MP produces the stop of motor M, by disconnecting it from at least one of the two conductors N or F which carry the supply voltage; in this case from conductor N.
  • the triac TR1 is driven by microcontroller MP so as to be made conductive.
  • triac TR1 delivers therefore a signal of alternate supply to the gates of diodes D2, D4, D5, D7.
  • triac TR1 is driven by microcontroller MP on gate G, through resistor R14 and condenser C7.
  • Diodes D2, D4, D5 and D7 deliver to the ends of coil EA a unidirectional supply having the higher potential on terminal 1.
  • the flow of current in coil EA allows, for instance, the release of the washing agents, so that the latters fall in the inside of the washing chamber of the dishwashing machine.
  • the inductance constituted by windings of motor M, connected to the common point of diodes D2 and D5, and therefore in series to the triac, has the purpose of reducing the speed with which the current in the triac decreases, so as to overcoming the difficulty of the triac in sustaining this kind of commutation, wherein the use of the triac for controlling a load by means of a rectifying bridge is particularly hard.
  • the inductance value of the windings of motor M must be substantially lower than that of the windings of coil EA. This has the purpose of avoiding that a too high value of the inductance presented by the windings of motor M prevents the normal flow towards the rectifying circuit of the electric supply signal coming from conductor F.
  • the present implementation of the device is made possible by the acknowledgement of the fact that, during the phase of release of the washing agents in the inside of the washing chamber of a washing machine, the washing motor is deactivated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Control Of Electric Motors In General (AREA)

Claims (8)

  1. Steuerungsvorrichtung für ein Betätigungselement (EA) in Waschmaschinen, insbesondere in Geschirrspülmaschinen, welche folgendes umfaßt:
    eine von einem Wechselstromsystem versorgte elektronische Steuerschaltung (MP), die durch elektrische und elektronische Mittel (R16, R17, T) das Schalten eines Relais (RL1) steuert, welches während einer Waschphase bewirkt, daß die Stromzufuhr, die von wenigstens einem (N) von zwei Leitern (N, F) des Wechselstromsystems kommt, die Enden einer elektrischen Last (M) der Waschmaschine erreicht und alternativ die Verbindung zwischen der elektrischen Last (M) und wenigstens einem (N) der zwei Leiter (N, F) eine gewisse Zeit lang während Stillständen, die auftreten, wenn die Waschmaschine in Betrieb ist, unterbricht;
    Mittel (C7, R14, R15, TR1, D2, D4, D5, D7) zur Zufuhr eines Steuersignals, das von der elektronischen Steuerschaltung (MP) kommt, zu dem Betätigungselement (EA), wobei das Steuersignal von dem Schalten des Relais (RL1) abhängt,
    dadurch gekennzeichnet,
    daß die Mittel (C7, R14, R15, TR1, D2, D4, D5, D7) zur Zufuhr eines Steuersignals zu dem Betätigungselement (EA) einen elektronischen Schalter (TR1) umfassen, der ein Wechselstromsteuersignal an eine Gleichrichtungsdiodenbrücke (D2, D4, D5, D7) schickt, die ein in eine Richtung fließendes Gleichstromsteuersignal für das Betätigungselement (EA) erzeugt, wobei der elektronische Schalter von dem Wechselstromsystem durch die elektrische Last (M) der Waschmaschine versorgt wird, die mit dem elektronischen Schalter (TR1) in Reihe geschaltet ist.
  2. Steuerungsvorrichtung für ein Betätigungselement (EA) nach Anspruch 1,
    dadurch gekennzeichnet,
    daß der elektronische Schalter (TR1) aus einem Triac besteht.
  3. Steuerungsvorrichtung für ein Betätigungselement (EA) nach Anspruch 1,
    dadurch gekennzeichnet,
    daß die elektrische Last (M) der Waschmaschine aus dem Scheinwiderstand besteht, der an den Enden eines Waschmaschinenmotors existiert.
  4. Steuerungsvorrichtung für ein Betätigungselement (EA) nach Anspruch 3,
    dadurch gekennzeichnet,
    daß der Wert des genannten Scheinwiderstands niedriger ist als der Wert jenes Scheinwiderstands, der an den Enden des Betätigungselements (EA) besteht.
  5. Steuerungsvorrichtung für ein Betätigungselement (EA) nach Anspruch 1,
    dadurch gekennzeichnet,
    daß während Stillständen der Waschmaschine das in eine Richtung fließende Gleichstromsteuersignal für das Betätigungselement (EA) die Freisetzung von Waschmitteln in der Waschkammer der Maschine bewirkt.
  6. Steuerungsvorrichtung für ein Betätigungselement (EA) nach Anspruch 1,
    dadurch gekennzeichnet,
    daß das in eine Richtung fließende Gleichstromsteuersignal für das Betätigungselement (EA) zur Steuerung eines Elektroventils verwendet wird.
  7. Steuerungsvorrichtung für ein Betätigungselement (EA) nach Anspruch 1,
    dadurch gekennzeichnet,
    daß die elektrische Last (M) der Waschmaschine aus dem Scheinwiderstand besteht, der an den Enden einer Ablaufpumpe existiert.
  8. Steuerungsvorrichtung für ein Betätigungselement (EA) nach Anspruch 1,
    dadurch gekennzeichnet,
    daß die elektronische Steuerschaltung (MP) aus einer Mikrosteuerung besteht.
EP93118945A 1992-11-26 1993-11-25 Steuerungsvorrichtung für ein Betätigungselement in Waschmaschinen, insbesondere in Geschirrspülmaschinen, das ausgehend von einer Wechselspannung versorgt wird Expired - Lifetime EP0602423B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO920955 1992-11-26
ITTO920955A IT1258123B (it) 1992-11-26 1992-11-26 Dispositivo di comando di un elemento attuatore in macchine di lavaggio, in particolare lavastoviglie, alimentato a partire da una tensione alternata.

Publications (2)

Publication Number Publication Date
EP0602423A1 EP0602423A1 (de) 1994-06-22
EP0602423B1 true EP0602423B1 (de) 1998-04-01

Family

ID=11410880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93118945A Expired - Lifetime EP0602423B1 (de) 1992-11-26 1993-11-25 Steuerungsvorrichtung für ein Betätigungselement in Waschmaschinen, insbesondere in Geschirrspülmaschinen, das ausgehend von einer Wechselspannung versorgt wird

Country Status (4)

Country Link
EP (1) EP0602423B1 (de)
DE (1) DE69317738T2 (de)
ES (1) ES2116390T3 (de)
IT (1) IT1258123B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8922203B2 (en) 2012-01-16 2014-12-30 General Electric Company Turbomachine blade monitoring system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6807615A (de) * 1968-05-30 1969-12-02
GB1493578A (en) * 1973-12-01 1977-11-30 Integrated Circuit Controls Electronic controls
JPS582716B2 (ja) * 1977-05-28 1983-01-18 株式会社日立製作所 金自動洗濯機
US4410329A (en) * 1981-11-06 1983-10-18 General Electric Company Washing machine with oversuds detection and correction capability
FR2519660A1 (fr) * 1982-01-08 1983-07-18 Crouzet Sa Dispositif pour couper l'alimentation puissance d'une machine a laver automatique pendant la selection d'un programme

Also Published As

Publication number Publication date
ES2116390T3 (es) 1998-07-16
ITTO920955A1 (it) 1994-05-26
IT1258123B (it) 1996-02-20
DE69317738T2 (de) 1998-11-19
EP0602423A1 (de) 1994-06-22
DE69317738D1 (de) 1998-05-07
ITTO920955A0 (it) 1992-11-26

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