EP0557753A2 - Protection device of an apparatus - Google Patents

Protection device of an apparatus 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
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EP
European Patent Office
Prior art keywords
switches
heating element
circuit breaker
switch
contact
Prior art date
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Granted
Application number
EP93101707A
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German (de)
French (fr)
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EP0557753A3 (en
EP0557753B1 (en
Inventor
Peter Hofsäss
Jens Radbruch
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ERBENGEMEINSCHAFT PETER HOFSAESS
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ERBENGEMEINSCHAFT PETER HOFSAESS
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Publication of EP0557753A2 publication Critical patent/EP0557753A2/en
Publication of EP0557753A3 publication Critical patent/EP0557753A3/xx
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Publication of EP0557753B1 publication Critical patent/EP0557753B1/en
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    • 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)
  • Electronic Switches (AREA)
  • Noodles (AREA)
  • Surgical Instruments (AREA)

Abstract

The invention creates a self-latching device for protection of an apparatus, such as a discharge lamp with a low residual current. For this purpose, the device according to the invention has, in a manner known per se, a protection switch which opens the power supply of the apparatus in the event of overtemperature and is characterised in that a heating element is arranged in parallel with the apparatus and the protection switch, and a normally-open switch, which closes at the switching temperature of the protection switch, is arranged in series therewith. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Schützen eines Geräts, wie einer Entladungslampe, mit einem die Stromversorgung des Geräts bei Übertemperatur unterbrechenden Schutzschalter.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.

Bei gattungsgemäßen Vorrichtungen ist ein bei Übertemperatur sich öffnender Schutzschalter in Parallelanordnung mit einem Heizelement versehen, wobei beide in Reihe mit der zu schützenden Last geschaltet sind. Der geschlossene Schalter hat einen geringen Widerstand, so daß der Stromfluß im wesentlichen über diesen erfolgt, während über das parallel geschaltete Heizelement praktisch kein Stromfluß erfolgt, so daß dieses auch nicht heizt. Wenn aufgrund einer Störung die zu schützende Last eine Übertemperatur erreicht, wird der Temperaturschutzschalter geöffnet, so daß über ihn kein Strom mehr zur Last fließen kann. Ein durch Widerstand von Last und Heizelement bestimmter geringer Strom, der aber dennoch zum Aufheizen des Heizelements aussreicht, fließt über das Heizelement, erwärmt dieses, so daß der Öffner durch das Heizelement offengehalten wird.In the case of devices of the generic type, 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. A low current determined by the resistance of the load and the heating element, but which nevertheless heats up of the heating element is sufficient, flows over the heating element, heats it so that the opener is kept open by the heating element.

Bei gewissen Geräten, wie insbesondere Entladungslampen reicht im Störfalle der sehr geringe Reststrom nicht aus, um den Schutzschalter offenzuhalten, so daß es hier zu dem unerwünschten Takten kommt.With certain devices, such as discharge lamps in particular, 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.

Der Erfindung liegt die Aufgabe zugrunde auch bei derartigen Geräten, wie Entladungslampen, bei denen lediglich ein geringer Reststrom fließt ein derartiges Takten im Falle einer Störung zu vermeiden und ein permanentes Öffnen des bei Übertemperatur sich öffnenden Schutzschalters bis zum manuellen Abschalten der anliegenden Spannung sicherzustellen.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.

Erfindungsgemäß wird die genannte Aufgabe durch eine Vorrichtung der gattungsgemäßen Art gelöst, welche dadurch gekennzeichnet ist, daß parallel zum Gerät und zum Schutzschalter ein Heizelement und mit diesem in Reihe ein bei der Schalttemperatur des Schutzschalters schließender Schließschalter angeordnet sind.According to the invention, the above object is achieved by 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.

Bei Übertemperatur der Last im Falle einer Störung öffnet diese den in Reihe mit der Last liegenden Schutzschalter und schließt gleichzeitig den parallel zu Last und Schutzschalter liegenden Schließschalter, so daß dieser an die mit ihm in Reihe liegende Heizung die Versorungsspannung legt, so daß ein Stromfluß über die Heizung stattfindet, welcher die Heizung aufheizt, so daß diese den Öffner offen und den Schließer geschlossen halten kann.If the load overheats in the event of a fault, 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.

Hierdurch wird sicher ein Takten des Öffners und damit eine zusätzliche Belastung der Last vermieden, bis die Spannung manuell geschaltet wird.This reliably avoids clocking the break contact and thus an additional load on the load until the voltage is switched manually.

Gemäß bevorzugter Ausgestaltung ist vorgesehen, daß das Heizelement selbststabilisierend ist, wobei insbesondere das Heizelement ein Kaltleiter ist. Eine Weiterbildung sieht vor, daß die Schalter Bimetallschalter sind. Um eine kompakte Bauweise zu erreichen sehen weitere Ausgestaltungen vor, daß das Heizelement in unmittelbarem Wärmekontakt zu den Schaltern steht, wobei insbesondere die Schalter in das Heizelement in einer gemeinsamen Umhüllung angeordnet sind.According to a preferred embodiment, it is provided that the heating element is self-stabilizing, the heating element in particular being a PTC thermistor. A further development provides that the switches are bimetallic switches. In order to achieve a compact design, further refinements provide that 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.

In weiterer konkreter Ausbildung kann vorgesehen sein, daß die Bimetallschalter in einem elektrisch leitenden Gehäuse angeordnet sind, das einen ihrer Kontakte bildet, wobei insbesondere das Heizelement zwischen den beiden metallisch leitenden Gehäusen der Schalter diese berührend angeordnet ist und lediglich der Schutzschalter, nicht aber der Schließschalter an seinem Gehäuse mit einem elektrischen Anschluß versehen ist.In a further specific embodiment it can be provided that 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.

Eine bevorzugte konkrete Ausgestaltung sieht vor, daß die beiden Schalter mit ihren Böden unter Zwischenlage des Heizelements gegeneinander gerichtet angeordnet sind, wobei ein zusätzlicher mechanischer Erhalt dadurch erreicht werden kann, daß die gesamte Einheit aus den beiden Schaltern und dem Heizelement beispielsweise in einem Schrumpfschlauch angeordnet sind.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 .

Alternative Ausgestaltungen sehen vor, daß die Schalter nebeneinander angeordnet sind, wobei das Heizelement unterhalb ihrer Böden angeordnet ist und eine elektrische sowie Wärmebrücke bildet und daß die beiden Schalter nebeneinander angeordnet sind und das Heizelement zwischen ihnen angeordnet ist, wobei im letzteren Falle das Heizelement zwischen zwei ebenen Schenkeln elektrisch leitende Übertragungswinkel angeordnet sind, deren weiterer winkliger Schenkel unter dem Boden der Schalter berührt.Alternative embodiments provide that the 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.

Zur elektrischen Isolierung und Vermeidung jeglichen Leckstroms zwischen den beiden Schaltern, die vorzugsweise in der genannten gemeinsamen Umhüllung angeordnet sind, sieht eine weitere Ausbildung vor, daß die Schalter auf ihrer Oberseite durch eine Isolierschicht überdeckt sind, die lediglich in Mittelbereichen der Schalter mit einer Öffnung zur Kontaktierung von elektrischen Anschlüssen am weiteren Kontakt der Schalter freigelassen sind.To electrically isolate and avoid any leakage current between the two switches, which are preferably arranged in the above-mentioned common casing, 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.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den Ansprüchen und aus der nachfolgenden Beschreibung, in der Ausführungsbeispiele unter Bezugnahme auf die Zeichnung im einzelnen erläutert sind. Dabei zeigt:

Figur 1
eine schematische Darstellung der der erfindungsgemäßen Vorrichtung in ihren sämtlichen Ausgestaltungen zugrundeliegenden Schaltung;
Figur 2a bis 2c
eine erste Ausführungsform der erfindungsgemäßen Vorrichtung in Seitenansicht sowie Draufsicht von oben und von unten;
Figuren 3a bis 3d
eine zweite Ausführungsform der erfindungsgemäßen Vorrichtung mit einem vertikalen Längsschnitt (Figur 3a), einer Phantomdarstellung in Draufsicht (Figur 3b), einer Stirnseitenansicht (3c) und einem vertikalen Querschnitt (3d); und
Figuren 4a bis 4d
eine weitere erfindungsgemäße Ausgestaltung der Vorrichtung mit gleichen Darstellungsweisen bzw. Sichtweisen wie die der Figuren 3a bis 3d.
Further advantages and features of the invention result from the claims and from the following description in which exemplary embodiments are explained in detail with reference to the drawing. It shows:
Figure 1
is a schematic representation of the circuit underlying the device according to the invention in all its configurations;
Figure 2a to 2c
a first embodiment of the device according to the invention in side view and top view from above and below;
Figures 3a to 3d
a second embodiment of the device according to the invention with a vertical longitudinal section (Figure 3a), a phantom view in plan view (Figure 3b), an end view (3c) and a vertical cross section (3d); and
Figures 4a to 4d
a further embodiment of the device according to the invention with the same representations or views as that of Figures 3a to 3d.

Die erfindungsgemäße Vorrichtung dient zum Schutz in Übertemperatur einer Last, bei der im Störfall nur noch ein so geringer Reststrom fließt, daß dies für die übliche Selbsthaltung des Thermo-Schutzschalters mit parallel zu diesen, aber gemeinsam mit diesen in Reihe zur Last geschalteten Heizwiderstand, nicht ausreicht.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.

Erfindungsgemäß ist daher vorgesehen, daß parallel zu dem in üblicher Weise vorgesehenen als Öffner bzw. Thermoschutzschalter 2 ausgebildeten Thermoschutzschalter und der Last gemeinsam in Reihe an Heizung 3 und ein als Schließer wirkender Thermoschalter 4 geschaltet bzw. angeordnet sind, wie dies in Figur 1 dargestellt ist.According to the invention, it is therefore provided that, in parallel with the conventional thermal protection switch designed as a break contact or thermal protection switch 2 and the load, are connected or arranged together in series with the heater 3 and a thermal switch 4 acting as a make contact, as shown in FIG .

Thermoschutzschalter 2, Heizung 3, als Schließer wirkender Thermoschalter 4 sind dabei vorzugsweise als eine Einheit ausgebildet, die räumlich nahe der Last 1 angeordnet wird. Die Heizung 3 ist in bevorzugter Ausgestaltung ein selbststabilisierender Widerstand, wie ein Kaltleiter, insbesondere in Form eines Bariumtitanat-PTC-Elements.Thermal protection switch 2, heater 3, acting as a make contact thermal switch 4 are preferably formed as a unit, which is arranged spatially close to the load 1 becomes. In a preferred embodiment, the heater 3 is a self-stabilizing resistor, such as a PTC thermistor, in particular in the form of a barium titanate PTC element.

Der Thermoschutzschalter 2 und der Schließschalter 4 haben gleiche Umschalttemperaturen. Wenn die Schalttemperatur aber aufgrund eines Störfalls an der Last 1, eines Wärmestaus oder dergleichen überschritten wird, so öffnet einerseits der Thermoschutzschalter 2, andererseits schließt der Schließschalter 4. Durch das Öffnen des Thermoschutzschalters 2 wird die Last 1 vom Netz weggenommen und daher geschützt. Durch das Schließen des Schließschalters 4 wird die Heizung 3 an das Netz angelegt und heizt damit. Durch das Heizen der Heizung 3 wird eine ausreichende Temperatur erzielt, auch wenn nach dem Abschalten der Last 1 diese keine erhöhte Temperatur mehr erzeugt, um derart den Thermoschutzschalter 2 dauernd offenzuhalten und ein Takten und damit ein wieder Ein- und wieder Ausschalten der Last 1 zu verhindern.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.

Die Thermoschalter 2,4 sind vorzugsweise als Bimetallschalter in an sich bekannter Weise ausgebildet.The thermal switches 2,4 are preferably designed as bimetallic switches in a manner known per se.

Eine erste konkrete Ausführungsform der erfindungsgemäßen Vorrichtung ist in den Figuren 2a bis 2c dargestellt.A first specific embodiment of the device according to the invention is shown in FIGS. 2a to 2c.

Der Thermoschutzschalter 2 und der Schließschalter 4 sind in üblicher Weise ausgebildete Bimetallschalter mit einem metallischen Gehäuse 6 bzw. 7, das jeweils den einen Kontakt am Schluß des Schalters 2 bzw. 4 bildet. Die Gehäuse 6,7 sind flache pastillenartige Gehäuse mit einem flachen reißförmigen Boden. Bei der Ausgestaltung der Figuren 2a bis 2b sind die Schalter 2,4 mit ihren Böden 8,9 gegeneinander gerichtet und zwischen den Böden 8,9 ist das Heizelement 3 angeordnet. Dieses besteht, wie gesagt, aus einer PTC-Pastille. Es kann dinggemäß, soweit es in üblicher Weise metallisierte Oberflächen auf seiner Stirnseite 11,12 aufweist mit den Böden der Schalter 2,4 verlötet sein, um derart nicht nur eine gute elektrische und eine gute Wärmeverbindung zu diesen zu bilden, sondern eine mechanische Verbindung, wodurch die gesamte Einheit als solche zusammengehalten wird. Es könnte weiterhin vorgesehen sein, daß zur alternativen oder zusätzlichen mechanischen Sicherung die gesamte Einheit aus Schaltern 2,4 und Heizung 3 durch eine Umhüllung, wie ein Schrumpfschlauch ummantelt sind, der die Teile zusammenhält und die Schalter 2, 4 von beiden Seiten gegen die Heizung 3 drückt.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. In the configuration of FIGS. 2a to 2b, 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. Accordingly, insofar as it has metallized surfaces on its end face 11, 12 in the customary manner, it can be soldered to the bottoms of the switches 2, 4 in order not only to form a good electrical and a good thermal connection to them, but also a mechanical connection, whereby the whole unit as such is held together. It could also be provided that, for alternative or additional mechanical security, 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.

Der Thermoschutzschalter 2 ist einerseits an seinem gegenüber seinem Gehäuse 6 isolierten Kontakt 13 (auf der seinem Boden 8 gegenüberliegenden Stirnseite) mit einer Anschlußlitze 14, andererseits an seinem Gehäuse mit einer Anschlußlitze 16 versehen, während der Schließschalter 4 lediglich an seinem gegenüber dem Gehäuse 7 isolierten Kontakt 17 mit einer Anschlußlitze 18 versehen ist. Die Anschlußlitzen können in üblicher Weise befestigt, wie festgelötet oder festgeschweißt sein.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.

Die Anschlußlitze 14 wird mit der einen Seite der Last 1, die Anschlußlitze 16 mit dem einen Anschluß des Netzes und die Anschlußlitze 18 mit der anderen Seite der Last und der anderen Seite des Netzes verbunden. Derart wird die Schaltung der Figur 1 realisiert. Die Einheit der Figuren 2a bis 2c wird räumlich eng bei der Last angeordnet, beispielsweise in einer Entladungslampenleuchte mitintekriert.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.

Die Figuren 3a bis 3d zeigen eine weitere Ausgestaltung der erfindungsgemäßen Vorrichtung. Hier sind die Schalter 2,4 gemeinsam nebeneinander in einem flachen isolierenden Gehäuse 21 angeordnet, welches durch einen Deckel 22 beispielweise mittels Nieten 23 verschlossen ist.Figures 3a to 3d show a further embodiment of the device according to the invention. Here 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.

Zwischen den beiden Schaltern 2,4 ist das Heizelement 3 angeordnet. Um einen guten wärme- und elektrischen Kontakt zu schaffen sitzen die Schalter 2,4 auf einem Unterschenkel 26,27 von elektrisch leitenden Winkelteilen 28,29 auf, deren Seitenschenkel 31,32 jeweils neben den einander zugewandten Seiten der Schalter 2,4 sich pararallel zueinander erstrecken und zwischen denen das Heizelement 3 angeordnet ist. Ein Preßdruck wird dadurch erreicht, daß die Schalter 2,4 an ihnen den Schenkeln 31, 32 entgegengesetzten Seiten durch Formausbildungen 33, 34 des Gehäuses 21 gehalten sind und gegeneinander gedrückt werden, 50 daß die Schenkel 31,32 fest gegen das Heizelement gedrückt werden. Hierdurch wird der gewünschte gute elektrische und Wärme-Kontakt bewirkt.The heating element 3 is arranged between the two switches 2, 4. In order to create good thermal and electrical contact, 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.

Die Anschlußkontakte 14,16,18 sind jeweils mit den gleichen Bezugszeichen bezeichnet wie die entsprechenden Anschlüsse bei der Ausgestaltung der Figuren 2a bis 2c. Bei der Ausgestaltung der Figuren 3a bis 3d sind sie durch flache Laschen gebildet, die einerseits auf Anschluß 14, 18 an dem gegenüber dem jeweiligen Gehäuse 6,7 isolierten oberen Kontakt der Schalter 2,4 anliegen und gegen diese durch den Deckel 22 gedrückt werden, wobei Laschen seitlich aus dem Gehäuse heraus geführt sind. Der Anschluß 16 weist ein bogenförmiges Kontaktteil 36 auf, welches seitlich innerhalb der Formausbildung 33 an der Seitenwand des Reparaturschutzschalters 2 anliegt.The 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.

Im Kontaktbereich sind die Kontakte 14, 18 mit einer Federhand anliegenden Lasche 37, 38 versehen.In the contact area, the contacts 14, 18 are provided with a tongue 37, 38 which rests against a spring hand.

Die Ausgestaltung der Figuren 4a bis 4d ist ähnlich der der Figuren 3a bis 3d. Gleiche Elemente sind mit gleichen Bezugszeichen gezeichnet; hinsichtlich gleicher Elemente wird auf die Erläuterung der Figuren 3a bis 3d verwiesen. Bei dieser Ausgestaltung ist ein langgestrecktes Heizelement in Form eines PTC-Bariumtitanat-Streifens oder dergleichen unterhalb der beiden - ebenso wie bei den Figuren 3a bis 3d - nebeneinander angeordneten Schaltern 2,4 angeordnet, so daß es seiner Oberseite 41 an den Böden 8,9 der Gehäuse 6,7 der Schalter 2,4 anliegt. Der Anpreßdruck wird ebenso wie bei der Ausgestaltung der Figuren 3a bis 3d durch den aufgesetzten Deckel 22 bewirkt. Hierdurch wird ein direkter guter wärme- und elektrischer Kontakt zwischen den Schaltern 2,4 und dem Heizelement 3 erzeugt.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. In this embodiment, 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. As in the embodiment of FIGS. 3a to 3d, 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.

Claims (13)

Vorrichtung zum Schützen eines Geräts, wie einer Entladungslampe, mit einem die Stromversorgung des Geräts bei Übertemperatur unterbrechenden Schutzschalter, dadurch gekennzeichnet, daß parallel zum Gerät (1) und zum Schutzschalter ein Heizelement (3) und mit diesem in Reihe ein bei der Schalttemperatur des Schutzschalters (2) schließender Schließschalter (4) angeordnet sind.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, characterized in that a heating element (3) is connected in parallel with the device (1) and the circuit breaker and is connected in series with the switching temperature of the circuit breaker (2) closing switch (4) are arranged. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Heizelement (3) selbststabilsierend ist.Device according to claim 1, characterized in that the heating element (3) is self-stabilizing. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Heizelement ein Kaltleiter ist.Device according to claim 1 or 2, characterized in that the heating element is a PTC thermistor. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Schalter (2,4) Bimetallschalter sind.Device according to one of claims 1 to 3, characterized in that the switches (2,4) are bimetallic switches. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Heizelement (3) in unmittelbarem Wärmekontakt zu den Schaltern (2,4) steht.Device according to one of claims 1 to 4, characterized in that the heating element (3) is in direct thermal contact with the switches (2,4). Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Bimetallschalter in einem elektrisch leitenden Gehäuse angeordnet sind, das einen ihrer Kontakte bildet.Device according to one of the preceding claims, characterized in that the bimetallic switches are arranged in an electrically conductive housing which forms one of their contacts. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Schalter (2,4) in das Heizelement (3) in einer gemeinsamen Umhüllung angeordnet sind.Device according to one of the preceding claims, characterized in that the switches (2, 4) are arranged in the heating element (3) in a common envelope. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß das Heizelement zwischen den beiden metallisch leitendenen Gehäusen der Schalter (2,4) diese berührend angeordnet ist und lediglich der Schutzschalter (2), nicht aber der Schließschalter (4) an seinem Gehäuse mit einem elektrischen Anschluß versehen ist.Apparatus according to claim 6, characterized in that the heating element between the two metallically conductive housings of the switches (2,4) is arranged in contact with them and only the circuit breaker (2), but not the closing switch (4) on its housing with an electrical connection is provided. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die beiden Schalter (2,4) mit ihren Böden (8,9) unter Zwischenlage des Heizelements (3) gegeneinander gerichtet angeordnet sind.Apparatus according to claim 8, characterized in that the two switches (2, 4) are arranged with their bottoms (8, 9) facing one another with the heating element (3) in between. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Schalter (2,4) nebeneinander angeordnet sind, wobei das Heizelement unterhalb ihrer Böden angeordnet ist und eine elektrische sowie eine Wärmebrücke bildet.Device according to Claim 8, characterized in that the switches (2, 4) are arranged next to one another, the heating element being arranged below their bottoms and forming an electrical and a thermal bridge. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die beiden Schalter nebeneinander angeordnet sind und das Heizelement (3) zwischen ihnen angeordnet ist.Apparatus according to claim 8, characterized in that the two switches are arranged side by side and the heating element (3) is arranged between them. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß das Heizelement zwischen zwei ebenen Schenkeln elektrisch leitende Übertragungswinkel angeordnet sind, deren weiterer winkliger Schenkel unter dem Boden der Schalter (2,4) berührt.Apparatus according to claim 11, characterized in that the heating element is arranged between two flat legs of electrically conductive transmission angles, the further angled legs of which touch the switch (2, 4) under the bottom. Vorrichtung nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, daß die Schalter auf ihrer Oberseite durch eine Isolierschicht überdeckt sind, die lediglich in Mittelbereichen der Schalter mit einer Öffnung zur Kontaktierung von elektrischen Anschlüssen am weiteren Kontakt der Schalter freigelassen sind.Device according to one of claims 9 to 11, characterized in that the switches are covered on their upper side by an insulating layer which is only left open in the central areas of the switches with an opening for contacting electrical connections at the further contact of the switches.
EP93101707A 1992-02-25 1993-02-04 Protection device of an apparatus Expired - Lifetime EP0557753B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4205699A DE4205699A1 (en) 1992-02-25 1992-02-25 Device for protecting a device
DE4205699 1992-02-25

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EP0557753A2 true EP0557753A2 (en) 1993-09-01
EP0557753A3 EP0557753A3 (en) 1994-01-05
EP0557753B1 EP0557753B1 (en) 1997-05-02

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4406533A1 (en) * 1993-06-11 1994-12-15 Tridonic Bauelemente Ges Mbh Temperature protection circuit for an inductor
DE4406534C2 (en) * 1993-06-11 1998-10-29 Tridonic Bauelemente Ignitor for cold start discharge lamps
DE10208213A1 (en) * 2002-02-26 2003-09-18 Bsh Bosch Siemens Hausgeraete Method and device for driving an element made of a shape memory alloy
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

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FR899106A (en) * 1942-10-27 1945-05-22 Philips Nv Protection device of an electrical circuit
FR1401964A (en) * 1963-07-19 1965-06-11 Otter Controls Ltd Temperature sensitive electrical switch
DE8806648U1 (en) * 1988-05-20 1989-06-22 Hofsäss, Peter, 7530 Pforzheim Temperature switching device
EP0453596A1 (en) * 1990-04-25 1991-10-30 Ulrika Hofsäss Temperature switch

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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

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FR899106A (en) * 1942-10-27 1945-05-22 Philips Nv Protection device of an electrical circuit
FR1401964A (en) * 1963-07-19 1965-06-11 Otter Controls Ltd Temperature sensitive electrical switch
DE8806648U1 (en) * 1988-05-20 1989-06-22 Hofsäss, Peter, 7530 Pforzheim Temperature switching device
EP0453596A1 (en) * 1990-04-25 1991-10-30 Ulrika Hofsäss Temperature switch

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EP0557753A3 (en) 1994-01-05
DE59306306D1 (en) 1997-06-05
EP0557753B1 (en) 1997-05-02
ATE152545T1 (en) 1997-05-15
DE4205699A1 (en) 1994-01-20

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