EP2625329B1 - Door locking device for household appliances - Google Patents

Door locking device for household appliances Download PDF

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Publication number
EP2625329B1
EP2625329B1 EP11781624.9A EP11781624A EP2625329B1 EP 2625329 B1 EP2625329 B1 EP 2625329B1 EP 11781624 A EP11781624 A EP 11781624A EP 2625329 B1 EP2625329 B1 EP 2625329B1
Authority
EP
European Patent Office
Prior art keywords
actuator
heat
door locking
locking device
range
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.)
Not-in-force
Application number
EP11781624.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2625329A1 (en
Inventor
Fabrizio Promutico
Camillo Pilla
Gianfranco Proietti
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.)
Bitron SpA
Original Assignee
Bitron SpA
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 Bitron SpA filed Critical Bitron SpA
Publication of EP2625329A1 publication Critical patent/EP2625329A1/en
Application granted granted Critical
Publication of EP2625329B1 publication Critical patent/EP2625329B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door
    • 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
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/12—Casings; Tubs
    • D06F39/14—Doors or covers; Securing means therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
    • H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
    • 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 relates to a door locking device for household appliances, comprising a solenoid actuator associated with a control circuit.
  • the invention relates to a door locking device of the kind in which the aforesaid control circuit comprises
  • US 4 702 619 A discloses temperature sensors for detecting the temperature of water-cooled engines of motor vehicles.
  • a temperature sensor comprises an NTC resistor and a PTC resistor connected in series with one another, and a further NTC resistor connected in parallel to said series.
  • the series-connected NTC and PTC resistors are shown as having, as a whole, an essentially V-shaped resistance temperature characteristic, with a very fast resistance increase for temperatures above 88°C.
  • EP 0 350 770 A2 discloses semiconductor ceramic compositions adapted for use for temperature sensors having either PTC or NTC or so-called V-shaped characteristics.
  • the composition exhibits a resistivity vs. temperature characteristic having a markedly pointed V-shaped with a pronounced negative variation of the resistivity which quickly drops from about 10 4 ⁇ cm at ambient temperature (25°C) to a minimum of several hundreds ⁇ cm at about 130°C, and then a sudden, almost “vertical” increase of the resistivity which at about 150°C is again at values of some thousands ⁇ cm.
  • FIG. 1 An example of a prior art door locking device of the above-defined type is described in EP 1 564 760 A2 .
  • a control circuit for the solenoid actuator A of such a door locking device is shown in Figure 1 , where it is indicated as a whole by the number 1.
  • the solenoid actuator A is designed to control the position of a mechanical member such as a catch L of the door locking device.
  • the circuit 1 comprises a power source 2, for example the alternating current mains supply, and a switch 3, such as a triac, controlled by an electronic unit ECU.
  • This switch 3 is in series with the actuator A.
  • a heat-sensitive device 4 is also connected in series with the actuator A.
  • this device is a PTC resistor in which the impedance, and in particular the resistance R, increases considerably when the temperature of the device exceeds a predetermined level.
  • Figure 2 of the attached drawings is a qualitative illustration of the linearized characteristic of resistance R (shown on the vertical axis) as a function of the temperature T (shown on the horizontal axis) for a heat-sensitive device of this type: this characteristic shows a resistance which remains substantially constant or only slightly variable at a relatively low value, at 60 ohms for example, in the range from ambient temperature (approximately 25°C) to 100°C or above, whereas for higher temperatures the increase in its value is almost "vertical".
  • PTC resistor of the type shown in Figure 2 The characteristic of a PTC resistor of the type shown in Figure 2 is such that this form of heat-sensitive device can be used effectively to protect the actuator A against over-currents or over-temperatures, but not against any undesired actuation caused by brief pulses (spikes) due to acquired noise or disturbances.
  • One object of the present invention is to provide a door locking device of the type defined above with a solenoid actuator control circuit such that the aforesaid drawbacks of the prior art solutions can be overcome.
  • the heat-sensitive device comprises a PTC resistor and an NTC resistor connected in series with each other.
  • this PTC resistor and the associated NTC resistor can be assembled together mechanically so as to form a single component.
  • a door locking device comprises a control circuit for the solenoid actuator.
  • This control circuit essentially has the same circuit topology as that of Figure 1 .
  • the heat-sensitive device 4 has a distinctive resistance-temperature characteristic of the type which will now be described by way of example with reference to Figure 3 .
  • a first temperature range indicated by C1 in Figure 3 , substantially equal to the ambient operating temperature range, and at higher temperatures which are still acceptable, the heat-sensitive device 4 has a high impedance (resistance R), which can limit the current flowing in the actuator A to a level which is insufficient for the activation of the actuator.
  • the field C1 extends to a point close to (and just after) 50°C, and in this range the resistance of the heat-sensitive device 4 is equal to or greater than approximately 200 ohms.
  • the heat-sensitive device 4 has a reduced impedance (resistance) which allows sufficient current to flow in the actuator 4 to cause its activation.
  • the temperature range C2 extends from approximately 55°C to approximately 150°C, and in this range the resistance R of the heat-sensitive device 4 reaches a minimum value Rmin of approximately 60 ohms.
  • the heat-sensitive device 4 In a third range of even higher temperatures, adjacent to the range C2, the heat-sensitive device 4 has a progressively increasing impedance (resistance), which, as in the case of conventional PTC resistors, can effectively limit the current flowing in the actuator A.
  • the range C3 comprises the temperatures which are essentially greater than approximately 150°C.
  • any spontaneous disturbance, such as a current spike, induced by noise in the circuit will not be sufficiently long-lasting or powerful to heat the heat-sensitive device 4 to a point where its resistance decreases to a value at which the current flowing in the actuator A can cause the activation of the latter.
  • the duration and/or power of a pulse flowing in the control circuit 1 are such that the heat-sensitive device 4 is heated sufficiently to raise its temperature to a point in the range C2 of Figure 3 , the corresponding reduction of the resistance of the heat-sensitive device 4 enables the actuator A to be activated or energized.
  • the heat-sensitive device 4 will have a correspondingly high impedance (resistance), thus effectively reducing the current flowing in the actuator A.
  • the actuator is thus effectively protected from over-currents and/or over-temperatures.
  • Figures 4 and 5 show a non-limiting exemplary embodiment of a heat-sensitive device 4 for the control circuit of a door locking device according to the invention.
  • the heat-sensitive device 4 comprises a PTC resistor 5, in the form of a chip or cylindrical disc, having a principal face or base on which an NTC resistor 6, also in the form of a cylindrical disc, is connected centrally.
  • this heat-sensitive device 4 has the appearance of a single monolithic component.
  • the PTC resistor 5 comprises a central layer of resistive material 5a ( Figure 5 ), on the flat end faces of which there are first electrode layers 5b, made for example from a nickel-chromium alloy such as Ni80Cr20, and second, outer, electrode layers 5c, made from silver for example.
  • first electrode layers 5b made for example from a nickel-chromium alloy such as Ni80Cr20
  • second, outer, electrode layers 5c made from silver for example.
  • the NTC resistor 6 comprises a layer of resistive material 6a, applied to the central portion of an electrode layer 5c of the PTC resistor 5.
  • the resistive layer 6 has an electrode layer 6b, also made from silver for example, on its outer face.
  • the ratio between the resistance R25, presented by the heat-sensitive device 4 at 25°C, and the value Rmin is approximately 10, that is to say greater by approximately one order of magnitude than it would be for an ordinary PTC resistor according to the prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Textile Engineering (AREA)
  • Power Engineering (AREA)
  • Lock And Its Accessories (AREA)
  • Magnetically Actuated Valves (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
EP11781624.9A 2010-10-05 2011-10-05 Door locking device for household appliances Not-in-force EP2625329B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2010A000814A IT1402217B1 (it) 2010-10-05 2010-10-05 Circuito di controllo per un attuatore a comando elettrico, in particolare un attuatore a solenoide
PCT/IB2011/054391 WO2012046198A1 (en) 2010-10-05 2011-10-05 Door lock device for household appliances

Publications (2)

Publication Number Publication Date
EP2625329A1 EP2625329A1 (en) 2013-08-14
EP2625329B1 true EP2625329B1 (en) 2016-04-20

Family

ID=43738359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11781624.9A Not-in-force EP2625329B1 (en) 2010-10-05 2011-10-05 Door locking device for household appliances

Country Status (5)

Country Link
EP (1) EP2625329B1 (it)
KR (1) KR101884488B1 (it)
CN (1) CN103228835B (it)
IT (1) IT1402217B1 (it)
WO (1) WO2012046198A1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3074230B1 (fr) * 2017-11-30 2021-02-26 Valeo Systemes De Controle Moteur Dipositif electromagnetique

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3863210A (en) * 1973-07-30 1975-01-28 Gen Motors Corp Liquid level sensor having an integral ptc and ntc thermistor
GB2140615B (en) * 1983-03-22 1987-03-18 Standard Telephones Cables Ltd Thermistor composite
JP2733667B2 (ja) 1988-07-14 1998-03-30 ティーディーケイ株式会社 半導体磁器組成物
IT1236884B (it) * 1989-12-18 1993-04-26 Onofrio Rocchitelli Dispositivo per il bloccaggio dei mezzi di chiusura ed apertura dei portelli di macchine aventi nell'interno parti soggette a rotazione inerziale realizzante la chiusura e l'apertura dei contatti dell'interruttore serie rispettivamente posticipata ed anticipata al bloccaggio del portello
ITTO20030554A1 (it) * 2003-07-17 2005-01-18 Eltek Spa Dispositivo di attuazione e/o bloccaggio per apparecchi elettrodomestici avente un migliorato sistema di controllo dell'attuazione.
US20050180078A1 (en) * 2004-02-13 2005-08-18 Adams Rite Aerospace, Inc. Solenoid protection method and apparatus
ITMI20050297A1 (it) * 2005-02-25 2006-08-26 Elettrotecnica Rold Srl Bloccoporta per lavatrici
ITTO20070295A1 (it) * 2007-05-03 2008-11-04 Bitron Spa Sistema blocca-porta per un apparecchio elettrodomestico
ITTO20070501A1 (it) * 2007-07-10 2009-01-11 Indesit Co Spa Dispositivo e metodo per bloccare e sbloccare la porta di un elettrodomestico
GB2460833B (en) * 2008-06-09 2011-05-18 2D Heat Ltd A self-regulating electrical resistance heating element

Also Published As

Publication number Publication date
WO2012046198A1 (en) 2012-04-12
WO2012046198A8 (en) 2012-09-07
KR101884488B1 (ko) 2018-08-30
KR20130143578A (ko) 2013-12-31
EP2625329A1 (en) 2013-08-14
IT1402217B1 (it) 2013-08-28
ITTO20100814A1 (it) 2012-04-06
CN103228835A (zh) 2013-07-31
CN103228835B (zh) 2016-10-12

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