EP2148552B1 - Dispositif de sécurité pour un appareil de cuisson ayant une fonction de micro-ondes - Google Patents

Dispositif de sécurité pour un appareil de cuisson ayant une fonction de micro-ondes Download PDF

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Publication number
EP2148552B1
EP2148552B1 EP20080290721 EP08290721A EP2148552B1 EP 2148552 B1 EP2148552 B1 EP 2148552B1 EP 20080290721 EP20080290721 EP 20080290721 EP 08290721 A EP08290721 A EP 08290721A EP 2148552 B1 EP2148552 B1 EP 2148552B1
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EP
European Patent Office
Prior art keywords
switch
door
closed
safety device
microwave
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EP20080290721
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German (de)
English (en)
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EP2148552A1 (fr
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Topinox SARL
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Topinox SARL
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Priority to EP20080290721 priority Critical patent/EP2148552B1/fr
Priority to DE200850003108 priority patent/DE502008003108D1/de
Publication of EP2148552A1 publication Critical patent/EP2148552A1/fr
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Publication of EP2148552B1 publication Critical patent/EP2148552B1/fr
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/666—Safety circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6414—Aspects relating to the door of the microwave heating apparatus
    • H05B6/6417—Door interlocks of the microwave heating apparatus and related circuits

Definitions

  • the present invention relates to a safety device for a cooking appliance with microwave function.
  • cooking appliances of this type it can be both pure microwave appliances and cooking appliances which, in addition to a microwave cooking function, provide further cooking functions, such as frying, steaming, etc.
  • Safety devices of the type mentioned have the purpose to ensure that no microwaves can escape when the door of the cooking appliance is open. Requirements for such safety devices are laid down in the EU standards EN 60335-2-90 ("Special requirements for industrial microwave ovens") and EN 60335-2-25 (“Special requirements for microwave ovens and combined microwave ovens”). According to these standards, the cooking appliances must have at least two door interlocks that are actuated when the door is opened, and at least one of these must be a supervised door interlock. Further, at least one door latch must include a switch that shuts off the microwave generator or its power circuit when the door is opened. In particular, the monitoring device of the monitored door lock must disable the device if its switching part controlling the microwave generator fails. Finally, failure of any single electrical or mechanical part that can affect the response of a door lock shall not disable any other door lock or monitoring of a supervised door lock, unless the device becomes inoperative.
  • a safety device for a cooking appliance in this case for a pure microwave oven, is in the DE 33 37 141 A1 shown.
  • the associated electrical circuit which is also referred to as "interlock circuit” is in Fig. 1 displayed.
  • Fig. 1 is shown, is a working circuit 1 for the microwave source, namely the magnetron K6 and its associated components, between two network phases I and II of the power grid.
  • the interlock circuit of Fig. 1 includes two door switches e3 and e5, which can be actuated directly by the appliance door. Furthermore, it comprises a monitoring switch e4 whose switching contact can be actuated by a switch which is articulated on the appliance door of the microwave oven.
  • the circuit arrangement of Fig. 1 shows the circuit status with the door closed. In this position, the door switches e3 and e5 are closed, and the monitoring switch e4 is in the open position. When the door is opened, normally the two door switches e3 and e5 should open and the monitor switch e4 should close without load.
  • the EP 0 450 846 A2 discloses a power supply circuit for a microwave oven comprising first and second bus bars connected to a power source.
  • a high voltage transformer has a primary winding having first and second ends connected to the first and second bus bars, respectively.
  • a first door switch is connected between the first bus bar and the first end of the primary winding, the first door switch being opened by opening the door of the microwave oven.
  • a second door switch is connected between the second bus bar and the second end of the primary winding, the second switch being opened by opening the door of the microwave oven.
  • the circuit further includes a third switch having a movable contact and first and second fixed contacts, the movable contact contacting the first fixed contact in response to closing the door and the second fixed contact in response to opening the door.
  • the movable contact and the first fixed contact are connected between the first switch and the first end when the door is closed.
  • the movable contact and the second fixed contact are connected between the first switch and the second bus bar when the door is opened.
  • the DE 32 44 675 A1 discloses a monitoring device for a safety device for safety shutdown of microwave ovens.
  • a microwave device is connected via circuit breaker and two-phase relay contacts to a power supply.
  • the circuit breakers are used to monitor within the microwave oven, and they interrupt current paths to the microwave oven when the door is opened to a cooking chamber of the microwave oven.
  • a first circuit breaker must be monitored.
  • the second circuit breaker is designed as a changeover switch. Opens the first switch due to functional failure when opening the cooking chamber is no longer, then the switched second circuit breaker voltage is applied to a monitoring circuit. If, in the event of a fault, the first circuit breaker remains closed even though the second circuit breaker is switched, a base current for a transistor is no longer current limited by a resistor.
  • the US 4,345,144 refers to an arrangement for monitoring locking and unlocking of an oven door.
  • the assembly includes a latch member for locking a hand-operated latch.
  • a lock member verification switch for detecting a part of the lock member which engages with the pawl member is provided.
  • the invention has for its object to provide a safety device for a cooking appliance with microwave function, which can be implemented easily and inexpensively and still meets the above-cited safety standards.
  • the safety device comprises a closing switch which is coupled to a door of the cooking appliance in such a way that it is normally opened when the door is open and closed when the door is closed, and in the open position prevents the microwave source of the cooking appliance from being supplied with power.
  • the restriction “normally” indicates that in exceptional cases it may happen that the closing switch is not switched according to the position of the door, for example because its contact will stick or stick. Exactly such accidents should be considered by the safety device.
  • the safety device comprises a changeover switch which is coupled to the appliance door in such a way that it is normally in a first switching position when the door is open and in a second switching position when the door is closed.
  • the changeover switch prevents in its first switching position that the microwave source is supplied with power.
  • the safety device comprises a fuse which interrupts the supply of the microwave source with power when the closing switch is closed and the changeover switch is in the first switching position.
  • the closing switch is the monitored switch: if the closing switch namely deviated from the normal case should remain closed despite the door open, because he gets stuck, for example, in the closed position, the fuse blows, because the change-over switch with the door open in the first shift position is located.
  • the second fact can be assumed in the context of the one-error theory, because not both switches are assumed to be faulty at the same time.
  • the closing switch in deviation from the normal case, gets stuck in the open position when the door is closed, the microwave source is not supplied with power, ie this error is also detected immediately.
  • the closing switch is therefore completely monitored.
  • the changeover switch is partially monitored: namely, if the changeover switch, deviating from the normal case, with the door closed in the first switching position gets stuck, it is assumed by the one-fault theory that the closing switch is closed, so that in turn Blown fuse and the microwave operation is overridden.
  • a resistor is provided in series with the fuse when the closing switch is closed and the changeover switch is in the first position.
  • the closing switch and the changeover switch are coupled to the appliance door in such a way that, when the door is closed, first the changeover switch is switched to the second switching position and then the closing switch is closed. Conversely, when the door is opened, the closing switch is first opened and then the changeover switch is switched to the first position.
  • the switching sequence can be specified by suitable mechanical coupling of the switch with the door. This ensures that the fuse can blow only if the corresponding switch combination occurs due to a switch failure, and not only temporarily due to an inappropriate switching sequence when opening or closing the door.
  • the changeover switch in the first position connects a first node to a second node and in the second position the first node to a third node, wherein the first node and the closing switch are connected in series.
  • the current with which the microwave source is supplied with power flows through the third node. This ensures, as required above, that the power supply to the microwave source is interrupted when the closing switch is open and / or the changeover switch is in the first switching position.
  • the supply current for the microwave source itself does not have to be passed through the third node, but a signal with which the microwave source is driven or switched could also be passed through the third node.
  • the signal could be a current to which a relay is switched.
  • the close switch in the open and / or changeover switches in the first position would prevent the microwave source from being powered.
  • the resistor is preferably connected in series with the second node.
  • the fuse may be connected in series with the first or second node.
  • the fuse is preferably a fuse which, if the current flow is too high, interrupts the current and is thereby destroyed, for example by a fuse. This permanently puts the microwave source out of operation in the event of a fault until the error has been detected and corrected.
  • Fig. 2 shows an interlock circuit 10 according to a development of the invention, which is a safety device for a cooking appliance with microwave function.
  • the interlock circuit 10 comprises a first terminal 12 and a second terminal 14, between which a voltage is applied or can be applied, which is suitable for generating a working current through a microwave source 18.
  • the microwave source 18 is typically a magnetron.
  • a changeover switch S 2 is provided, which in a first switching position, the in Fig. 2 is shown by the solid line connecting the first node 1 with a second node 2. In this switching position, a current flows between the terminals 12 and 14 through a resistor 20.
  • the changeover switch S 2 in a second switching position (dashed line) connects the nodes 1 and 3
  • a current flows between the terminals 12 and 14 through the microwave source 18th and can provide them with power.
  • the switches S 1 and S 2 are coupled to the door of a cooking appliance with microwave function (not shown) such that when the door is open (solid switching position in Fig. 2 ) of the closing switch S 1 is opened and the changeover switch S 2 in the first switching position, and with the door closed, the closing switch S 1 closed and the changeover switch S 2 in the second switching position (dashed switching position in Fig. 2 ). Furthermore, the switches S 1 and S 2 are coupled to the appliance door such that when the door is closed, the changeover switch S 2 is first switched to the second switching position and then the closing switch S 1 is closed. Conversely, when opening the door, the closing switch S 1 is first opened and then the changeover switch is switched to the first switching position.
  • both the closing switch S 1 must be closed and the changeover switch S 2 in the second switching position, so that the microwave source 18 is supplied with power. Therefore, both switches S 1 , S 2 are independently suitable to turn off the microwave source 18 and their power supply when the door is opened. Further, the closing switch S 1 is a monitored switch that disables the microwave source 18 when it fails. Here, the failure is that the switch S 1 gets stuck in a position that differs from the door position, that is, for example, when the door is closed or closed when the door is open. This is by reference to Fig. 3 explained in more detail.
  • Fig. 3A shows the case that the door is open and the closing switch S 1 is defective, namely deviating from the current door position is closed.
  • a current flows between the terminals 12 and 14 through the fuse 16 and the resistor 20.
  • Der Resistor 20 is so small that the resulting current flow causes the fuse 16 to blow. It can not be generated microwave radiation, since the changeover switch S 2 is in the first switching position.
  • the microwave source 18 can not be put into operation later, since the fuse 16 is permanently burned. This case is still detected in any case, and the closing switch S 1 is thus monitored in this regard.
  • Fig. 3B shows the case in which the changeover switch S 2 is defective with the door open and is different from the current door position in the second switching position. Also in this case, no microwave radiation can be generated since the power supply of the microwave source 18 is interrupted by the closing switch S 1 . In this case, even with the door open, microwave radiation can not escape from the device despite failure of the changeover switch S 2 .
  • Fig. 3C shows the case in which the door is closed and the closing switch S 1 is defective, namely deviating from the current door position is open. Also in this case, the microwave source 18 is cut off from the power supply, although in this case, ie with the door closed, the generation of microwaves would be harmless anyway. However, the failure of the microwave function directs the user to the fault of the closing switch S 1 . Out FIGS. 3A and 3C So it follows that the closing switch S 1 is monitored in the sense that any deviation of the switching position of door position leads directly to a failure of the microwave function, so that the error is readily detected.
  • the combination of the closing switch S 1 and the fuse 16 constitutes a monitoring device of the monitored door lock which disables the device according to the directive EN 60335-2-90, paragraph 22, 106, if the switching part (here the closing switch S 1 ), the the microwave source 18 controls failed.
  • FIG. 3D shows the case that when the door is closed, the changeover switch S 2 is different from the current door position in the first switching position. Also in this case, the microwave source 18 is not powered, and as in the case of Fig. 3A the fuse 16 will blow. This means that this failure of the changeover switch S 2 is detected.
  • the interlock circuit 10 complies with the above-mentioned European Union safety guidelines, and this with an extremely simple and inexpensive construction which requires only two door switches.
  • interlock circuit 10 is just one embodiment of the invention, and numerous modifications are possible.
  • the switches S 1 and S 2 directly switch the current for the microwave source 18 in the exemplary embodiment shown.
  • a switching element for example a relay, which in turn switches a microwave source.
  • Essential to the invention is only that the interlock circuit is used so that the power supply to the microwave source is prevented when the closing switch S 1 is opened and / or the changeover switch S 2 in the first position, regardless of which other components are switched in between.
  • the fuse 16 could of course also be connected between the resistor 20 and the second node 2.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Electric Ovens (AREA)

Claims (13)

  1. Dispositif de sécurité (10) pour un appareil de cuisson possédant une fonction micro-ondes,
    avec un interrupteur de fermeture (S1) qui est couplé avec une porte de l'appareil de cuisson de sorte qu'il est ouvert en situation normale lorsque la porte est ouverte et est fermé lorsque la porte est fermée, et qui empêche, dans sa position ouverte, qu'une source de micro-ondes (18) soit alimentée en courant électrique,
    avec un interrupteur inverseur (S2), qui est couplé avec la porte de l'appareil de sorte qu'il se trouve, en situation normale, dans une première position de commutation lorsque la porte est ouverte et dans une seconde position de commutation lorsque la porte est fermée, et qui empêche, dans la première position de commutation, que la source de micro-ondes soit alimentée en courant électrique, et
    avec un coupe-circuit (16), qui interrompt l'alimentation en courant électrique de la source de micro-ondes (18) lorsque l'interrupteur de fermeture (S1) est fermé et que l'interrupteur inverseur (S2) se trouve dans la première position de commutation, caractérisé en ce que l'interrupteur de fermeture (S1) et l'interrupteur inverseur (S2) sont couplés avec la porte de sorte que, lors de la fermeture de la porte, l'interrupteur inverseur est d'abord commuté dans la seconde position de commutation et l'interrupteur de fermeture (S1) est ensuite fermé.
  2. Dispositif de sécurité (10) selon la revendication 1, dans lequel une résistance (20) est prévue, qui est commutée en série avec le coupe-circuit (16), lorsque l'interrupteur de fermeture (S1) est fermé et l'interrupteur inverseur (22) est dans la première position de commutation.
  3. Dispositif de sécurité selon l'une quelconque des revendications précédentes, dans lequel l'interrupteur de fermeture (S1) et l'interrupteur inverseur (S2) sont couplés avec la porte de l'appareil de sorte que, lors de l'ouverture de la porte, l'interrupteur de fermeture (S1) est d'abord ouvert et l'interrupteur inverseur (S2) est ensuite commuté dans la première position de commutation.
  4. Dispositif de sécurité (10) selon l'une quelconque des revendications précédentes, dans lequel l'interrupteur inverseur (S2) relie, dans la première position, un premier noeud (1) avec un deuxième noeud (2) et relie, dans la seconde position, le premier noeud (1) avec un troisième noeud (3), et dans lequel le premier noeud (1) et l'interrupteur de fermeture (S1) sont commutés en série.
  5. Dispositif de sécurité (10) selon la revendication 4, dans lequel le courant électrique, avec lequel la source de micro-ondes (18) est alimentée en énergie, passe par le troisième noeud (3).
  6. Dispositif de sécurité (10) selon la revendication 4, dans lequel un signal, avec lequel la source de micro-ondes (18) est commandée ou commutée, passe par le troisième noeud (3).
  7. Dispositif de sécurité (10) selon la revendication 6, dans lequel le signal est formé par un courant électrique, avec lequel un relais est commuté.
  8. Dispositif de sécurité (10) selon l'une quelconque des revendications 4 à 7, dans lequel la résistance (20) est commutée en série avec le deuxième noeud (2).
  9. Dispositif de sécurité (10) selon l'une quelconque des revendications 4 à 8, dans lequel le coupe-circuit (16) est commuté en série avec le premier ou le deuxième noeud (1, 2).
  10. Dispositif de sécurité (10) selon l'une quelconque des revendications précédentes, dans lequel le coupe-circuit (16) est réalisé de sorte qu'il interrompt le courant électrique en cas de flux de courant trop élevé et est ainsi détruit.
  11. Appareil de cuisson ayant une fonction micro-ondes, qui comprend un dispositif de sécurité selon l'une quelconque des revendications 1 à 10.
  12. Utilisation d'un dispositif de sécurité (10) selon l'une quelconque des revendications 1 à 10 pour un appareil de cuisson possédant une fonction micro-ondes.
  13. Procédé de mise hors circuit sûre d'une source de micro-ondes dans un appareil de cuisson possédant une fonction micro-ondes, dans lequel
    un interrupteur de fermeture (S1) est actionné par une porte de l'appareil de cuisson de sorte qu'il se trouve, en situation normale, ouvert lorsque la porte est ouverte et est fermé lorsque la porte est fermée, l'interrupteur de fermeture (S1) empêchant, dans la position ouverte, que la source de micro-ondes (18) soit alimentée en courant électrique,
    un interrupteur inverseur (S2) est actionné par la porte de l'appareil de sorte qu'il se trouve, en situation normale, dans une première position de commutation lorsque la porte est ouverte et dans une seconde position de commutation lorsque la porte est fermée, l'interrupteur inverseur (S2) empêchant, dans la première position de commutation, que la source de micro-ondes (18) soit alimentée en courant électrique, et
    dans lequel un coupe-circuit interrompt l'alimentation en courant électrique de la source de micro-ondes (18), lorsque l'interrupteur de fermeture (S1) est fermé et l'interrupteur inverseur (S2) se trouve dans la première position de commutation, caractérisé en ce que l'interrupteur de fermeture (S1) et l'interrupteur inverseur (S2) sont actionnés par la porte de sorte que, lors de la fermeture de la porte, l'interrupteur inverseur est d'abord commuté dans la seconde position de commutation et l'interrupteur de fermeture (S1) est ensuite fermé.
EP20080290721 2008-07-23 2008-07-23 Dispositif de sécurité pour un appareil de cuisson ayant une fonction de micro-ondes Active EP2148552B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20080290721 EP2148552B1 (fr) 2008-07-23 2008-07-23 Dispositif de sécurité pour un appareil de cuisson ayant une fonction de micro-ondes
DE200850003108 DE502008003108D1 (de) 2008-07-23 2008-07-23 Sicherheitseinrichtung für ein Gargerät mit Mikrowellenfunktion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20080290721 EP2148552B1 (fr) 2008-07-23 2008-07-23 Dispositif de sécurité pour un appareil de cuisson ayant une fonction de micro-ondes

Publications (2)

Publication Number Publication Date
EP2148552A1 EP2148552A1 (fr) 2010-01-27
EP2148552B1 true EP2148552B1 (fr) 2011-04-06

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EP20080290721 Active EP2148552B1 (fr) 2008-07-23 2008-07-23 Dispositif de sécurité pour un appareil de cuisson ayant une fonction de micro-ondes

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DE (1) DE502008003108D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107578933A (zh) * 2017-08-31 2018-01-12 杭州老板电器股份有限公司 一种用于厨房电器的开关装置及厨房电器

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3407279A (en) * 1965-10-08 1968-10-22 Melikian Inc Rudd High frequency heating apparatus
GB1062380A (en) * 1965-12-20 1967-03-22 Soernewitz Elektrowaerme Veb Means for protection against injury resulting from dielectric heating by microwave apparatus
US3995899A (en) * 1975-02-14 1976-12-07 Hobart Corporation Microwave oven interlock
JPS5725047Y2 (fr) 1977-11-16 1982-05-31
US4345144A (en) * 1980-01-21 1982-08-17 Harper-Wyman Company Safety latch control arrangement for self-cleaning oven
DE3244675A1 (de) * 1982-12-02 1984-06-07 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Ueberwachungseinrichtung fuer eine schutzeinrichtung
JPS59198620A (ja) 1983-04-26 1984-11-10 シャープ株式会社 調理器のスイツチ機構
DE3337141A1 (de) 1983-10-12 1985-04-25 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Sicherheitseinrichtung fuer einen mikrowellenofen
JPH03283384A (ja) * 1990-03-30 1991-12-13 Toshiba Corp 電子レンジの電源回路
CN1136762C (zh) 1999-01-14 2004-01-28 三星电子株式会社 微波炉安全装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107578933A (zh) * 2017-08-31 2018-01-12 杭州老板电器股份有限公司 一种用于厨房电器的开关装置及厨房电器

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DE502008003108D1 (de) 2011-05-19
EP2148552A1 (fr) 2010-01-27

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