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WO1992000655A1 - Procede et dispositif pour fermer ou ouvrir un circuit en fonction de la temperature - Google Patents

Procede et dispositif pour fermer ou ouvrir un circuit en fonction de la temperature Download PDF

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Publication number
WO1992000655A1
WO1992000655A1 PCT/SE1991/000422 SE9100422W WO9200655A1 WO 1992000655 A1 WO1992000655 A1 WO 1992000655A1 SE 9100422 W SE9100422 W SE 9100422W WO 9200655 A1 WO9200655 A1 WO 9200655A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
breaker
conducting element
circuit
current
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.)
Ceased
Application number
PCT/SE1991/000422
Other languages
English (en)
Inventor
Wilgot ÅHS
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.)
SEM AB
Original Assignee
SEM AB
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 SEM AB filed Critical SEM AB
Publication of WO1992000655A1 publication Critical patent/WO1992000655A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/275—Control of temperature characterised by the use of electric means with sensing element expanding, contracting, or fusing in response to changes of temperature
    • G05D23/27535—Details of the sensing element
    • G05D23/2754—Details of the sensing element using bimetallic element

Definitions

  • the invention relates to a method and a device for connect ⁇ ing, e.g. a current source, to a load, in dependence of tempe ⁇ rature, connecting and disconnecting the current source being 5 carried out by means of a temperature sensing circuit-breaker, the process being repeated as long as the ambient temperature of the temperature sensing circuit-breaker falls below a prede ⁇ termined value.
  • a temperature sensing circuit-breaker e.g. a current source
  • the current to the heating appliance will be cut off when the temperature has raised to 30 C, not to be supplied to the heat ⁇ ing appliance again as long as a person is sitting in the chair, as the heat of the person's body will maintain the temperature
  • thermoswitch higher than the switch-on temperature
  • the temperature of the heating appliance can thus decrease to 15 C without the current being switched on again, which is unsatisfactory.
  • the invention relates to a method and a device for repeated ⁇ ly connecting and disconnecting, in dependence of temperature, an electric circuit.
  • the device includes a temperature sensing circuit-breaker in series with a current conducting element.
  • the invention is characterized in that a thermal mass is provided between the current conducting element and the temperature sensing circuit-breaker, the mass absorbing loss energy from the current conducting element and giving off heat to the temperature sensing curcuit-breaker.
  • a thermal mass is provided between the current conducting element and the temperature sensing circuit-breaker, the mass absorbing loss energy from the current conducting element and giving off heat to the temperature sensing curcuit-breaker.
  • Fig. 1 shows a circuit diagram of an exemplified embodiment of the invention.
  • Figs. 2a and b illustrate the process of switching on and switching off as a function of time at two different ambient temperatures.
  • the device shown in Fig. 1 is intended for controlling an electrically heated vehicle seat, where 1 designates the tapping point for the heating element 2 which is to be controlled with respect to temperature.
  • the device comprises a heat sensing cir ⁇ cuit-breaker consisting of a bimetallic spring 3 having on its end a contact button for cooperation with a contact plate 4.
  • the spring 3 is arranged such that it makes contact with the plate 4 if the ambient temperature and that of the spring is lower than T , T Q being the breaking temperature of the breaker 3, 4. If the temperature is higher than T the bimetallic spring flexes so that contact ceases.
  • a battery 6 is connected to the input terminal 5 of the spring 3.
  • the base electrode 8 of a transistor 9 is connected to the output terminal 7 of the con ⁇ tact plate.
  • the transistor 9 is a current controlling NPN-transistor.
  • the collector of the transistor 9 is connected to the terminal 5 of the bimetallic sprin , and the emitter of the transistor is connected to the tapping point 1 of the device. Between base and emitter there is a resistor 10.
  • a thermal mass 11 of a predetermined size is provided.
  • the transistor 9 When the transistor 9 is conducting it gives off loss energy, which is absorbed by the thermal mass and converted into heat.
  • One end of the bime ⁇ tallic spring 3 is in contact with the thermal mass 11.
  • the device operates in the following way. It is assumed that the breaking temperature T of the circuit-breaker is 20 C and that the ambient temperature is -10 C (see Fig. 2a).
  • the bimetallic spring 3 is thus in contact with the plate 4 and the battery 6 emits current to the base 8 of the transistor 9, which then becomes conducting.
  • the current increases and the heater element 2 is heated.
  • the transistor 9 When the transistor 9 is conducting it gives off a certain amount of loss energy to the thermal mass 11, which converts the energy into heat which is conducted, at a certain delay, to the bimetallic spring 3,
  • the spring is thus heated, and when it reaches breaking temperature T (20 C) the currect connection to the transistor 9 is cut off.
  • the energy loss of the transistor then ceases, which brings with it that the tem ⁇ perature of the thermal mass 11 decreases.
  • Fig. 2b the corresponding process is illustrated when the ambient temperature is 5 C, the time of the first switching on then being shorter. In addition, the time between switching off and switching on again will become longer, and the time bet ⁇ ween switching on and switching off will be shorter than in the process according to Fig. 2a.
  • the heating element can be a mirror heater or some other heating means.
  • the invention can be used as a thermostate in various heating/cooling devices or, generally, for switching on and switching off an electrical circuit in dependence of temperature and time, that is, as a thermal timer.
  • the device can also be connected to alternating current, and the transistor can be replaced by some other current con ⁇ ducting element which produces loss energy which can be utilized in a thermal mass.
  • thermal breakers than bime- tallic breakers can be used, e.g. temperature operable semi-con ⁇ ductors, so called thermistors or other temperature dependent breakers.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

Procédé et dispositif servant à connecter ou déconnecter, en fonction de la température, un circuit électrique, une masse thermique (11) étant ménagée entre un élément conducteur (9) et un disjoncteur détectant la température (3, 4). La masse thermique (11) absorbe l'énergie de perte de l'élément conducteur (9) et transmet de la chaleur au disjoncteur détectant la température (3, 4).
PCT/SE1991/000422 1990-06-28 1991-06-11 Procede et dispositif pour fermer ou ouvrir un circuit en fonction de la temperature Ceased WO1992000655A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9002285A SE504022C2 (sv) 1990-06-28 1990-06-28 Sätt och anordning för att temperaturberoende till - och frånkoppla en elektrisk belastning
SE9002285-6 1990-06-28

Publications (1)

Publication Number Publication Date
WO1992000655A1 true WO1992000655A1 (fr) 1992-01-09

Family

ID=20379891

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000422 Ceased WO1992000655A1 (fr) 1990-06-28 1991-06-11 Procede et dispositif pour fermer ou ouvrir un circuit en fonction de la temperature

Country Status (2)

Country Link
SE (1) SE504022C2 (fr)
WO (1) WO1992000655A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996020492A1 (fr) * 1994-12-28 1996-07-04 Sem Ab Dispositif servant a connecter ou deconnecter une source de courant a un circuit electrique en fonction de la temperature ambiante
US5671942A (en) * 1994-02-23 1997-09-30 Marker Deutschland Gmbh Front jaw for a ski binding

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1523411A1 (de) * 1964-07-16 1970-04-16 Telefunken Patent Anordnung zur Konstanthaltung der Temperatur

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1523411A1 (de) * 1964-07-16 1970-04-16 Telefunken Patent Anordnung zur Konstanthaltung der Temperatur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELEKTRONIK-INDUSTRIE, Vol. 5, No. 3, March 1974, (Heidelberg).: "Neue Wege der Schaltungstechnik", see page 46, column 3, page 47, column 1; pages 4-5. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5671942A (en) * 1994-02-23 1997-09-30 Marker Deutschland Gmbh Front jaw for a ski binding
WO1996020492A1 (fr) * 1994-12-28 1996-07-04 Sem Ab Dispositif servant a connecter ou deconnecter une source de courant a un circuit electrique en fonction de la temperature ambiante

Also Published As

Publication number Publication date
SE504022C2 (sv) 1996-10-21
SE9002285L (fr)
SE9002285D0 (sv) 1990-06-28

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