EP0557753A2 - Dispositif de protection d'un appareil - Google Patents

Dispositif de protection d'un appareil Download PDF

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Publication number
EP0557753A2
EP0557753A2 EP93101707A EP93101707A EP0557753A2 EP 0557753 A2 EP0557753 A2 EP 0557753A2 EP 93101707 A EP93101707 A EP 93101707A EP 93101707 A EP93101707 A EP 93101707A EP 0557753 A2 EP0557753 A2 EP 0557753A2
Authority
EP
European Patent Office
Prior art keywords
switches
heating element
circuit breaker
switch
contact
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
EP93101707A
Other languages
German (de)
English (en)
Other versions
EP0557753B1 (fr
EP0557753A3 (fr
Inventor
Peter Hofsäss
Jens Radbruch
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.)
ERBENGEMEINSCHAFT PETER HOFSAESS
Original Assignee
ERBENGEMEINSCHAFT PETER HOFSAESS
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 ERBENGEMEINSCHAFT PETER HOFSAESS filed Critical ERBENGEMEINSCHAFT PETER HOFSAESS
Publication of EP0557753A2 publication Critical patent/EP0557753A2/fr
Publication of EP0557753A3 publication Critical patent/EP0557753A3/xx
Application granted granted Critical
Publication of EP0557753B1 publication Critical patent/EP0557753B1/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
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/504—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by thermal means

Definitions

  • the invention relates to a device for protecting a device, such as a discharge lamp, with a circuit breaker which interrupts the power supply to the device in the event of overtemperature.
  • a circuit breaker that opens in the event of excess temperature is provided in a parallel arrangement with a heating element, both being connected in series with the load to be protected.
  • the closed switch has a low resistance, so that the current flows essentially through it, while practically no current flows through the heating element connected in parallel, so that it does not heat either. If the load to be protected reaches an excess temperature due to a fault, the temperature protection switch is opened so that no current can flow through it to the load.
  • the very low residual current is not sufficient to keep the circuit breaker open in the event of a fault, so that undesired clocking occurs here.
  • the invention is also based on the object in such devices as discharge lamps, in which only a small residual current flows, to avoid such a clocking in the event of a fault and to ensure permanent opening of the circuit breaker which opens when the temperature is high, until the applied voltage is switched off manually.
  • a device of the generic type which is characterized in that a heating element and, in series therewith, a closing switch closing at the switching temperature of the circuit breaker are arranged in parallel with the device and the circuit breaker.
  • this opens the circuit breaker in series with the load and at the same time closes the closing switch in parallel with the load and circuit breaker, so that the supply voltage is applied to the heater in series with it, so that a current flow occurs the heating takes place, which heats the heating so that it can keep the opener and the closer closed.
  • the heating element is self-stabilizing, the heating element in particular being a PTC thermistor.
  • the switches are bimetallic switches.
  • the heating element is in direct thermal contact with the switches, the switches in particular being arranged in a common envelope in the heating element.
  • the bimetallic switches are arranged in an electrically conductive housing which forms one of their contacts, in particular the heating element between the two metallic conductive housings of the switches being arranged in contact with them and only the circuit breaker, but not the closing switch is provided with an electrical connection on its housing.
  • a preferred concrete embodiment provides that the two switches are arranged with their bottoms facing each other with the interposition of the heating element, whereby an additional mechanical preservation can be achieved in that the entire unit of the two switches and the heating element are arranged, for example, in a shrink tube .
  • switches are arranged next to one another, the heating element being arranged below their bottoms and forming an electrical and thermal bridge and that the two switches are next to each other are arranged and the heating element is arranged between them, in the latter case the heating element being arranged between two flat legs of electrically conductive transmission angles, the further angled leg of which touches the bottom of the switch.
  • a further embodiment provides that the switches are covered on their top by an insulating layer, which only has an opening in the central areas of the switches Contacting of electrical connections on the further contact of the switches are left free.
  • the device according to the invention is used for protection in excess temperature of a load, in which only a small residual current flows in the event of a malfunction, so that this is not necessary for the usual self-holding of the thermal circuit breaker in parallel with this, but together with these heating resistor connected in series with the load is sufficient.
  • Thermal protection switch 2 acting as a make contact thermal switch 4 are preferably formed as a unit, which is arranged spatially close to the load 1 becomes.
  • the heater 3 is a self-stabilizing resistor, such as a PTC thermistor, in particular in the form of a barium titanate PTC element.
  • the thermal protection switch 2 and the closing switch 4 have the same switchover temperatures. If, however, the switching temperature is exceeded due to a fault on the load 1, heat build-up or the like, the thermal protection switch 2 opens on the one hand, and the closing switch 4 closes on the other hand. By opening the thermal protection switch 2, the load 1 is removed from the mains and therefore protected. By closing the closing switch 4, the heater 3 is applied to the network and thus heats. A sufficient temperature is achieved by heating the heater 3, even if, after the load 1 has been switched off, it no longer generates an elevated temperature in order to keep the thermal protection switch 2 open continuously and to cycle and thus switch the load 1 on and off again prevent.
  • the thermal switches 2,4 are preferably designed as bimetallic switches in a manner known per se.
  • FIGS. 2a to 2c A first specific embodiment of the device according to the invention is shown in FIGS. 2a to 2c.
  • the thermal protection switch 2 and the closing switch 4 are bimetallic switches with a metallic housing 6 and 7, which are formed in the usual way and form the one contact at the end of the switch 2 and 4, respectively.
  • the housings 6, 7 are flat pastille-like housings with a flat tear-shaped bottom.
  • the switches 2, 4 are directed towards one another with their bases 8, 9 and between the bases 8, 9 that is Heating element 3 arranged. As I said, this consists of a PTC lozenge.
  • the entire unit comprising switches 2, 4 and heating 3 are encased by a covering, such as a shrink tube, which holds the parts together and the switches 2, 4 from both sides against the heating 3 presses.
  • the thermal protection switch 2 is provided on the one hand at its contact 13, which is insulated from its housing 6 (on the end face opposite its base 8), with a connecting lead 14, and on the other hand at its housing with a connecting lead 16, while the closing switch 4 is only insulated at its opposite from the housing 7
  • Contact 17 is provided with a lead 18.
  • the stranded wires can be attached in the usual way, such as soldered or welded.
  • the stranded wire 14 is connected to one side of the load 1, the stranded wire 16 to one end of the network and the stranded wire 18 to the other side of the load and the other side of the network.
  • the circuit of FIG. 1 is implemented in this way.
  • the unit of FIGS. 2a to 2c is spatially closely arranged under the load, for example, also integrated in a discharge lamp luminaire.
  • FIGS 3a to 3d show a further embodiment of the device according to the invention.
  • the switches 2, 4 are arranged side by side in a flat insulating housing 21 which is closed by a cover 22, for example by means of rivets 23.
  • the heating element 3 is arranged between the two switches 2, 4.
  • the switches 2, 4 are seated on a lower leg 26, 27 of electrically conductive angle parts 28, 29, the side legs 31, 32 of which are parallel to each other next to the mutually facing sides of the switches 2, 4 extend and between which the heating element 3 is arranged.
  • a pressing pressure is achieved in that the switches 2, 4 on the sides 31, 32 of the sides opposite them are held by shape configurations 33, 34 of the housing 21 and are pressed against one another, 50 that the legs 31, 32 are pressed firmly against the heating element. This results in the desired good electrical and thermal contact.
  • connection contacts 14, 16, 18 are each designated with the same reference numerals as the corresponding connections in the configuration of FIGS. 2a to 2c. In the embodiment of FIGS. 3a to 3d, they are formed by flat tabs which, on the one hand, rest on connection 14, 18 on the upper contact of the switches 2, 4, which is insulated from the respective housing 6, 7, and are pressed against them by the cover 22, whereby tabs are led out of the side of the housing.
  • the connection 16 has an arcuate contact part 36 which bears laterally within the form 33 on the side wall of the repair protection switch 2.
  • the contacts 14, 18 are provided with a tongue 37, 38 which rests against a spring hand.
  • FIGS. 4a to 4d The configuration of FIGS. 4a to 4d is similar to that of FIGS. 3a to 3d.
  • the same elements are drawn with the same reference numerals; with regard to the same elements, reference is made to the explanation of FIGS. 3a to 3d.
  • an elongated heating element in the form of a PTC barium titanate strip or the like is arranged below the two switches 2, 4, which are arranged next to one another, as in FIGS. 3 a to 3 d, so that its upper side 41 on the bases 8, 9 the housing 6.7, the switch 2.4 is present.
  • the contact pressure is brought about by the cover 22 attached. This creates a direct good thermal and electrical contact between the switches 2,4 and the heating element 3.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Protection Of Static Devices (AREA)
  • Surgical Instruments (AREA)
  • Electronic Switches (AREA)
  • Noodles (AREA)
EP93101707A 1992-02-25 1993-02-04 Dispositif de protection d'un appareil Expired - Lifetime EP0557753B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4205699 1992-02-25
DE4205699A DE4205699A1 (de) 1992-02-25 1992-02-25 Vorrichtung zum Schützen eines Geräts

Publications (3)

Publication Number Publication Date
EP0557753A2 true EP0557753A2 (fr) 1993-09-01
EP0557753A3 EP0557753A3 (fr) 1994-01-05
EP0557753B1 EP0557753B1 (fr) 1997-05-02

Family

ID=6452503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93101707A Expired - Lifetime EP0557753B1 (fr) 1992-02-25 1993-02-04 Dispositif de protection d'un appareil

Country Status (3)

Country Link
EP (1) EP0557753B1 (fr)
AT (1) ATE152545T1 (fr)
DE (2) DE4205699A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4406533A1 (de) * 1993-06-11 1994-12-15 Tridonic Bauelemente Ges Mbh Temperatur-Schutzschaltung für eine Drossel
DE4406534C2 (de) * 1993-06-11 1998-10-29 Tridonic Bauelemente Zündgerät für Kaltstartentladungslampen
US7395825B2 (en) 2002-02-26 2008-07-08 Bsh Bosch Und Siemens Hausgeraete Gmbh Method and device for activating an element made of a shape memory alloy
DE10208213A1 (de) * 2002-02-26 2003-09-18 Bsh Bosch Siemens Hausgeraete Verfahren und Vorrichtung zum Ansteuern eines Elements aus einer Formgedächtnislegierung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR899106A (fr) * 1942-10-27 1945-05-22 Philips Nv Dispositif de protection d'un circuit électrique
FR1401964A (fr) * 1963-07-19 1965-06-11 Otter Controls Ltd Interrupteur électrique sensible à la température
DE8806648U1 (de) * 1988-05-20 1989-06-22 Hofsäss, Peter, 7530 Pforzheim Temperaturschalteinrichtung
EP0453596A1 (fr) * 1990-04-25 1991-10-30 Ulrika Hofsäss Commutateur à température

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2930959A (en) * 1958-09-26 1960-03-29 Stubnitz Greene Corp Motor overload protection system
US3718879A (en) * 1971-05-19 1973-02-27 Texas Instruments Inc Apparatus for starting and protecting of electrical motors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR899106A (fr) * 1942-10-27 1945-05-22 Philips Nv Dispositif de protection d'un circuit électrique
FR1401964A (fr) * 1963-07-19 1965-06-11 Otter Controls Ltd Interrupteur électrique sensible à la température
DE8806648U1 (de) * 1988-05-20 1989-06-22 Hofsäss, Peter, 7530 Pforzheim Temperaturschalteinrichtung
EP0453596A1 (fr) * 1990-04-25 1991-10-30 Ulrika Hofsäss Commutateur à température

Also Published As

Publication number Publication date
ATE152545T1 (de) 1997-05-15
EP0557753B1 (fr) 1997-05-02
EP0557753A3 (fr) 1994-01-05
DE59306306D1 (de) 1997-06-05
DE4205699A1 (de) 1994-01-20

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