EP0433158A1 - Method and device for controlling a microwave oven - Google Patents

Method and device for controlling a microwave oven Download PDF

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Publication number
EP0433158A1
EP0433158A1 EP90403521A EP90403521A EP0433158A1 EP 0433158 A1 EP0433158 A1 EP 0433158A1 EP 90403521 A EP90403521 A EP 90403521A EP 90403521 A EP90403521 A EP 90403521A EP 0433158 A1 EP0433158 A1 EP 0433158A1
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EP
European Patent Office
Prior art keywords
magnetron
microwave
operating
electrical connection
transformer
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
EP90403521A
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German (de)
French (fr)
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EP0433158B1 (en
Inventor
Gérard Pressouyre
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TEM ELECTROMENAGER
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TEM ELECTROMENAGER
Thomson Electromenager SA
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Publication of EP0433158A1 publication Critical patent/EP0433158A1/en
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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

Definitions

  • the present invention relates to a method for controlling a microwave oven, and to a microwave oven implementing this method.
  • a microwave oven is usually used to heat various items of different kinds. In one of its applications, this oven is used to defrost, reheat and cook food and drinks.
  • a microwave oven generally comprises a microwave production system and a compartment receiving these microwaves and serving as a resonance chamber and enclosure for processing these foods and drinks.
  • a microwave production system in a microwave oven frequently includes a magnetron which provides microwaves and electrical and / or electronic accessories for powering and controlling this magnetron and for cooling this production system. microwave.
  • the magnetron's power and control accessories are, for example, transformers, switches, capacitors, diodes, drive motors, and the system cooling accessories are often electric fans.
  • the object of the present invention to avoid these drawbacks is an efficient and economical method of controlling a microwave oven making it possible to improve the performance of this oven.
  • the present invention also relates to a microwave oven implementing this method.
  • a microwave oven illustrated schematically and partially in FIGS. 1 and 2, comprises a casing 2 in which a compartment 3 is formed to house a microwave production and control system 5 of the microwave oven 1 and a compartment 6 serving as a resonance box and enclosure for processing food and drinks.
  • the compartment 6 is closed by a door 7.
  • the food or beverages stored in the compartment 6 and subjected to a thawing, reheating or cooking treatment are flooded by a stream of microwaves, produced by the micro-production system. and control 5, and brought into compartment 6 by a waveguide of a known type not shown.
  • the microwave production and control system 5 which is partially and schematically represented in FIG. 2 comprises a magnetron 10 having a predetermined power Pn situated in a power range going from 600 Watts to about 1500 Watts for domestic ovens. microwave.
  • a magnetron 14 is supplied with electric current through a transformer 15 and a programmer 17, by an alternating current source 18.
  • the magnetron 14 is connected through a capacitor 19 in series, on the secondary of the transformer 15 and comprises a rectifying diode 20 mounted in parallel so that the cathode of the diode 20 is connected to the anode of this magnetron 14 which is grounded and the anode of diode 20 is connected to the cathode of magnetron 14.
  • the diode 20 conducts and charges the capacitor 19.
  • the diode 20 is blocked and the magnetron 14 becomes conductive in the opposite direction at least partially discharging the capacitor 19.
  • the power of the magnetron 14 is, according to a known regulation, alternately transmitted for a given interval of time and then interrupted for another given interval of time, throughout a cycle of operation.
  • the ratio of the set of the operating time intervals to the set of the resting time intervals plus the set of the operating time intervals gives the average operating rate of the oven which enters in determining the processing time.
  • Each of the heating or cooking defrost treatments has a particular predetermined treatment time for each of the varieties or groups of varieties of food or drink.
  • the programmer 17 is preprogrammed and allows both a setting of the walking rate or power setting adapted to a thawing, heating or cooking treatment, and a setting of the treatment time. for each of the varieties or groups of varieties of food or drink.
  • the power and control accessories such as the transformer 15, the capacitor 19, the diode 20, the programmer 17 and the cooling accessories such as 'a fan not shown are usually predetermined in their characteristics according to a compromise which makes it possible to obtain an oven having an attractive cost price, a reduced size, correct operation and efficiency and a reasonable service life.
  • the power supply, control and cooling accessories associated with the magnetron 14 are chosen for their resistance to admissible limit temperatures which are specific to them in continuous operation. It frequently results from this compromise that at no time during operation of the furnace 12 does the magnetron 14 work at its maximum power Pn.
  • the magnetron 14 only works at a lower power which is a preset normal running power. This is a waste and a weak point for the performance of the known oven 12.
  • the present invention avoids these disadvantages.
  • a method of controlling a microwave oven with a microwave production tube such as a magnetron consists in the start of a cycle of a treatment of a food or a drink with operate the microwave production tube at its maximum power Pn for a time at most equal to a heating time of this microwave production tube or one or more power and cooling accessories thereof microwave production tube taken as a reference such as a transformer, that is to say the temperature rise time, from its or their temperature at rest to its or their predetermined operating temperature limit, and in the rest of this treatment cycle, to work the microwave production tube at a preset normal power, lower than its maximum power Pn.
  • the operating time of the microwave production tube at its maximum power Pn at the start of a cycle processing a food or drink is preferably less than a minute.
  • a microwave oven 1 comprises in its compartment 3 a system for producing and control 5 having a magnetron 10 as the microwave producing tube.
  • the magnetron 10 is supplied with electric current through a transformer 25 and a control device 28 by an alternating current source 30.
  • the magnetron 10 which is provided at its terminals with a rectifying diode 33, comprises on the one hand an anode 35 which connected to the cathode of this rectifier diode 33 is connected to a first end 36 of a secondary of the transformer 25 through first one of the two capacitors in parallel and of different values 38, 39 namely a capacitor with lower capacity 38 intended for operation of the magnetron 10 at a preset normal operating power lower than its maximum power Pn and a capacitor with higher capacity 39 reserved for operation of the magnetron 10 at its maximum power Pn and then a switch 41 establishing an electrical connection of one 38 or the other 39 of these two capacitors to the secondary of this transformer 25, and on the other hand a cathode 37 which connected to the anode of this re diode dressage 33 is connected to a second end 40 of this secondary of this transformer 25.
  • the switch 41 is either an electronic switch or an electromechanical switch of a known type.
  • the switch 41 comprises three terminals 44, 45, 46.
  • the terminal 44 is connected to the end 36 of the secondary of the transformer 25 while the terminals 45 and 46 are respectively connected to the operating capacitor 38 of the magnetron 10 at its operating power normal, and to the operating capacitor 39 of the magnetron 10 at its maximum power Pn.
  • the switch 41 includes an operating button 50, a timer 51 and a locking device 52 controlled by a temperature sensor 53, which allow either manual disconnection of a normal electrical link 44, 45 and manual connection of an electrical link with preset time 44-46, that is to say a disconnection of the magnetron 10 of its electrical connection allowing operation at its normal operating power and connection of the magnetron 10 to an electrical connection allowing operation at a preset time at its maximum power Pn, when the temperature of this magnetron 10 or of its power accessories and cooling taken as a reference and entered by the thermal sensor 53 is lower than its operating temperature limit, that is to say a blocking of the operating button 50, that is to say a maintenance of this normal electrical connection 44-45 by the locking device 52 when the temperature of this magnetron 10 or of its supply and cooling accessories taken as reference e and entered by the thermal sensor 53, is equal to or greater than its operating temperature limit.
  • the control device 28 of the microwave production and control system 5 of the oven 1 comprises, apart from the switch 41 described above, an electronic or electromechanical programmer of a known type 55.
  • This programmer 55 is preprogrammed, ensures via an operating button 57 switching on or off a primary of the transformer 25, via an operating button 58 selecting a defrosting, reheating or heating treatment cooking according to which an average rate of operation of the magnetron has been established, defined in a previous paragraph, by means of an operating button 59 a choice of treatment time and by means of an electronic circuit d 'a known type 60, an operational synchronization between the programmer 55 and the switch 41 when the operating power of the magnetron 10 changes.
  • this dish or this tea is stored in compartment 6 of the microwave oven 1 then the button 58 is put in its "cooking” or “reheating” position, the button 59 is turned to a location for a chosen treatment time, then the button 50 is pushed into its operating position at maximum power Pn of the magnetron 10 , and finally the button 57 is toggled in the power-on or on position of the oven 1.
  • the magnetron 10 then having its temperature at rest, emits microwaves at its maximum power Pn which accelerate the cooking of this dish or the reheating of this tea and gradually heats up. This slow rise in the temperature of the magnetron is due to the thermal inertia of its mass.
  • the switch 41 which works in synchronization with the programmer 55, changes automatically the operating power of the magnetron 10 by unplugging the operating capacitor 39 of the magnetron to its maximum power Pn and immediately connecting the operating capacitor 38 of the magnetron 10 to its normal operating power, and maintaining this normal operating power of the magnetron 10 until the end of the processing cycle, i.e. at the end of cooking the dish or reheating the tea.
  • the programmer 55 normally stops the operation of the oven the end of this chosen treatment time and simultaneously the switch 41 is automatically recalled in its normal electrical connection 44-45, that is to say in its connection with the capacitor 38 operating the magnetron 10 at its normal operating power . In this case, during all this chosen rapid processing time, the magnetron 10 operates at its maximum power Pn.
  • the microwave oven 1 has thus shortened the time for processing food or drinks without forcing the magnetron 10 and the supply and cooling accessories to operate above their working limit temperature, therefore without shortening their lifespan and without compromising the quality of treatment.

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

Abstract

Method of controlling a microwave oven having a microwave-producing tube such as a magnetron, characterised in that it consists: - at the start of a cycle of processing a foodstuff or a drink, in operating the microwave-producing tube at its maximum power Pn for a time at most equal to a time for reheating this microwave-producing tube or one or more accessories for powering and cooling this tube, and taken as a reference, such as a transformer, that is to say the temperature rise time, from its or their rest temperature, to its or their predetermined operating temperature limit and - in the remainder of this processing cycle, in operating the microwave-producing tube at a preset power for normal working, less than its maximum power Pn. Microwave oven implementing this method. <IMAGE>

Description

La présente invention concerne un procédé de commande d'un four à micro-ondes, et un four à micro-ondes mettant en oeuvre ce procédé.The present invention relates to a method for controlling a microwave oven, and to a microwave oven implementing this method.

Un four à micro-ondes est habituellement destiné à chauffer divers articles de différentes natures. Dans une de ses applications, ce four sert à décongeler, réchauffer et cuire des aliments et boissons. Un four à micro-ondes comporte en général un système de production de micro-ondes et un compartiment recevant ces micro-ondes et servant de caisse de résonnance et d'enceinte de traitement de ces aliments et boissons. Un système de production de micro-ondes dans un four à micro-ondes comprend fréquemment un magnétron qui fournit des micro-ondes et des accessoires électriques et/ou électroniques d'alimentation et de commande de ce magnétron et de refroidissement de ce système de production de micro-ondes. Les accessoires d'alimentation et de commande du magnétron sont par exemple des transformateurs, des commutateurs, des condensateurs, des diodes, des moteurs d'entraînement, et les accessoires de refroidissement du système sont souvent des ventilateurs électriques. Lors d'un fonctionnement du four, les composants et accessoires qui constituent le système de production de micro-ondes entrent en action et se chauffent à la fois individuellement et par influence sous l'effet d'une conduction ou convection thermique. Pour leur permettre de garder une bonne durée de vie et un bon fonctionnement, ces composants et accessoires doivent travailler à des températures individuelles ne dépassant pas des limites admissibles. Dans une amélioration de la performance du four par une augmentation de la puissance du magnétron, des solutions connues ont proposé de surdimentionner les accessoires d'élimentation et de commande ou de les refroidir davantage, par exemple par une utilisation d'un nombre plus grand de ventilateurs. Ces solutions connues entraînent non seulement un accroîssement du prix du four mais également une extension du volume occupé par ces composants et accessoires dans ce four aux dépend de leur compartiment de traitement des aliments et boissons pour une dimension donnée de ce four.A microwave oven is usually used to heat various items of different kinds. In one of its applications, this oven is used to defrost, reheat and cook food and drinks. A microwave oven generally comprises a microwave production system and a compartment receiving these microwaves and serving as a resonance chamber and enclosure for processing these foods and drinks. A microwave production system in a microwave oven frequently includes a magnetron which provides microwaves and electrical and / or electronic accessories for powering and controlling this magnetron and for cooling this production system. microwave. The magnetron's power and control accessories are, for example, transformers, switches, capacitors, diodes, drive motors, and the system cooling accessories are often electric fans. During operation of the oven, the components and accessories that make up the microwave production system come into action and heat both individually and by influence under the effect of thermal conduction or convection. To allow them to maintain a good service life and functioning, these components and accessories must work at individual temperatures not exceeding admissible limits. In an improvement of the performance of the furnace by an increase in the power of the magnetron, known solutions have proposed to oversize the power supply and control accessories or to cool them further, for example by using a greater number of fans. These known solutions not only lead to an increase in the price of the oven but also an extension of the volume occupied by these components and accessories in this oven at the expense of their food and drink processing compartment for a given dimension of this oven.

La présente invention visant à éviter ces inconvénients a pour objet un procédé efficace et économique de commande d'un four à micro-ondes permettant d'améliorer la performance de ce four.The object of the present invention to avoid these drawbacks is an efficient and economical method of controlling a microwave oven making it possible to improve the performance of this oven.

La présente invention a également pour objet un four à micro-ondes mettant en oeuvre ce procédé.The present invention also relates to a microwave oven implementing this method.

Selon l'invention, un procédé de commande d'un four à micro-ondes à tube de production de micro-ondes tel qu'un magnétron est caractérisé en ce qu'il consiste

  • - dans un début d'un cycle d'un traitement d'un aliment ou une boisson à faire fonctionner ce tube de production de micro-ondes à sa puissance maximale Pn pendant un temps au maximum égal à un temps de réchauffement de ce tube de production de micro-ondes ou de l'un ou des accessoires tels qu'un transformateur d'alimentation de ce tube, pris comme référence, c'est-à-dire le temps de montée de température, de sa ou leur température au repos, à sa ou leur température limite prédéterminée de fonctionnement, et
  • - dans le reste de ce cycle de traitement, à faire travailler le tube de production de micro-ondes à une puissance préétablie de marche normale, inférieure à sa puissance maximale Pn.
According to the invention, a method of controlling a microwave oven with a microwave production tube such as a magnetron is characterized in that it consists
  • - at the start of a cycle of treatment of a food or drink to operate this microwave production tube at its maximum power Pn for a time at most equal to a heating time of this tube production of microwaves or one or more accessories such as a power supply transformer for this tube, taken as a reference, that is to say the temperature rise time, its or their temperature at rest , at its or their predetermined operating temperature limit, and
  • - in the rest of this treatment cycle, to make the microwave production tube work at a preset normal power, lower than its maximum power Pn.

Pour mieux faire comprendre l'invention, on en décrit ci-après un exemple de mise en oeuvre et l'illustre par des desssins ci-annexés qui représentent dans:

  • - la figure 1 une vue de face schématique et partielle d'un four à micro-ondes selon l'invention,
  • - la figure 2, schématiquement et partiellement un circuit électrique d'un système de production de micro-ondes et de commande du four de la figure 1, et
  • - la figure 3, schématiquement et partiellement, un circuit électrique d'un système de production de micro-ondes et de commande d'un four connu à micro-ondes.
In order to better understand the invention, an example of its implementation is described below and illustrated by the appended drawings which represent in:
  • FIG. 1 a schematic and partial front view of a microwave oven according to the invention,
  • FIG. 2, diagrammatically and partially an electrical circuit of a microwave production system and control of the oven of FIG. 1, and
  • - Figure 3, schematically and partially, an electrical circuit of a microwave production system and control of a known microwave oven.

Un four à micro-ondes 1, illustré schématiquement et partiellement dans les figures 1 et 2, comprend une enveloppe 2 dans laquelle sont formés un compartiment 3 pour loger un système de production de micro-ondes et de commande 5 du four à micro-ondes 1 et un compartiment 6 servant de caisse de résonnance et d'enceinte de traitement des aliments et boissons. Le compartiment 6 est fermé par une porte 7.A microwave oven 1, illustrated schematically and partially in FIGS. 1 and 2, comprises a casing 2 in which a compartment 3 is formed to house a microwave production and control system 5 of the microwave oven 1 and a compartment 6 serving as a resonance box and enclosure for processing food and drinks. The compartment 6 is closed by a door 7.

Lors d'un fonctionnement du four 1, les aliments ou boissons entreposés dans le compartiment 6 et soumis à un traitement de décongélation, de réchauffement ou de cuisson sont inondés par un flux de micro-ondes, produits par le système de production de micro-ondes et de commande 5, et amenés dans le compartiment 6 par un guide d'ondes d'un type connu non représenté.During operation of the oven 1, the food or beverages stored in the compartment 6 and subjected to a thawing, reheating or cooking treatment are flooded by a stream of microwaves, produced by the micro-production system. and control 5, and brought into compartment 6 by a waveguide of a known type not shown.

Le système de production de micro-ondes et de commande 5 qui est partiellement et schématiquement représenté dans la figure 2 comprend un magnétron 10 ayant une puissance prédéterminée Pn située dans une gamme de puissance allant de 600 Watts à 1500 Watts environ pour des fours ménagers à micro-ondes.The microwave production and control system 5 which is partially and schematically represented in FIG. 2 comprises a magnetron 10 having a predetermined power Pn situated in a power range going from 600 Watts to about 1500 Watts for domestic ovens. microwave.

Dans un four connu à micro-ondes 12 dont le circuit électrique est schématiquement et partiellement représenté dans la figure 3, un magnétron 14 est alimenté en courant électrique à travers un transformateur 15 et un programmateur 17, par une source de courant alternatif 18. Dans ce circuit électrique, le magnétron 14 est branché à travers un condensateur 19 en série, sur le secondaire du transformateur 15 et comprend une diode de redressement 20 montée en parallèle de manière que la cathode de la diode 20 soit reliée à l'anode de ce magnétron 14 qui est à la masse et l'anode de la diode 20 soit connectée à la cathode du magnétron 14.In a known microwave oven 12 whose electrical circuit is schematically and partially shown in FIG. 3, a magnetron 14 is supplied with electric current through a transformer 15 and a programmer 17, by an alternating current source 18. In this electrical circuit, the magnetron 14 is connected through a capacitor 19 in series, on the secondary of the transformer 15 and comprises a rectifying diode 20 mounted in parallel so that the cathode of the diode 20 is connected to the anode of this magnetron 14 which is grounded and the anode of diode 20 is connected to the cathode of magnetron 14.

Lors d'une première alternance négative de la tension au secondaire du transformateur 15, la diode 20 conduit et charge le condensateur 19. Au cours d'une alternance positive suivante de la tension au secondaire de ce transformateur 15, la diode 20 se bloque et le magnétron 14 devient conducteur dans le sens opposé en déchargeant au moins en partie le condensateur 19.During a first negative alternation of the voltage at the secondary of the transformer 15, the diode 20 conducts and charges the capacitor 19. During a next positive alternation of the voltage at the secondary of this transformer 15, the diode 20 is blocked and the magnetron 14 becomes conductive in the opposite direction at least partially discharging the capacitor 19.

La puissance du magnétron 14 est, selon une régulation connue, alternativement émise pour un intervalle donné de temps puis interrompue pour un autre intervalle donné de temps, tout le long d'un cycle de fonctionnement. Dans un cycle de fonctionnement, le rapport de l'ensemble des intervalles de temps de marche sur l'ensemble des intervalles de temps de repos additionnné de l'ensemble des intervalles de temps de marche, donne le taux de marche moyen du four qui entre dans la détermination du temps de traitement.The power of the magnetron 14 is, according to a known regulation, alternately transmitted for a given interval of time and then interrupted for another given interval of time, throughout a cycle of operation. In an operating cycle, the ratio of the set of the operating time intervals to the set of the resting time intervals plus the set of the operating time intervals gives the average operating rate of the oven which enters in determining the processing time.

Chacun des traitements de décongélation de réchauffement ou de cuisson a un temps particulier de traitement prédéterminé pour chacune des variétés ou groupes de variétés d'aliments ou boissons.Each of the heating or cooking defrost treatments has a particular predetermined treatment time for each of the varieties or groups of varieties of food or drink.

Dans le four connu à micro-ondes 12, le programmateur 17 est préprogrammé et permet à la fois un réglage du taux de marche ou réglage de puissance adapté à un traitement de décongélation, de réchauffement ou de cuisson, et un réglage du temps de traitement pour chacune des variétés ou groupes de variétés d'aliments ou boissons.In the known microwave oven 12, the programmer 17 is preprogrammed and allows both a setting of the walking rate or power setting adapted to a thawing, heating or cooking treatment, and a setting of the treatment time. for each of the varieties or groups of varieties of food or drink.

Dans le four connu à micro-ondes 12 ayant un magnétron 14 de puissance Pn donnée, les accessoires d'alimentation et de commande tels que le transformateur 15, le condensateur 19, la diode 20, le programmateur 17 et les accessoires de refroidissement tels qu'un ventilateur non représenté sont habituellement prédéterminés dans leurs caractéristiques suivant un compromis qui permet d'obtenir un four ayant un prix de revient intéressant, un encombrement réduit, un fonctionnement et un rendement corrects et une durée de vie raisonnable.In the known microwave oven 12 having a magnetron 14 of given power Pn, the power and control accessories such as the transformer 15, the capacitor 19, the diode 20, the programmer 17 and the cooling accessories such as 'a fan not shown are usually predetermined in their characteristics according to a compromise which makes it possible to obtain an oven having an attractive cost price, a reduced size, correct operation and efficiency and a reasonable service life.

A cause de leur réchauffement en fonctionnement, les accessoires d'alimentation, de commande et de refroidissement associés au magnétron 14 sont choisis pour leur tenue à des températures limites admissibles qui leur sont propres dans un fonctionnement continu. Il résulte fréquemment de ce compromis qu'à aucun moment du fonctionnement du four 12 le magnétron 14 ne travaille au maximum de sa puissance Pn. Le magnétron 14 travaille seulement à une puissance plus faible qui est une puissance préétablie de marche normale. Cela constitue un gaspillage et un point faible pour la performance du four connu 12.Because of their heating in operation, the power supply, control and cooling accessories associated with the magnetron 14 are chosen for their resistance to admissible limit temperatures which are specific to them in continuous operation. It frequently results from this compromise that at no time during operation of the furnace 12 does the magnetron 14 work at its maximum power Pn. The magnetron 14 only works at a lower power which is a preset normal running power. This is a waste and a weak point for the performance of the known oven 12.

La présente invention permet d'éviter ces désavantages.The present invention avoids these disadvantages.

Selon l'invention, un procédé de commande d'un four à micro-ondes à tube de production de micro-ondes tel qu'un magnétron consiste dans un début d'un cycle d'un traitement d'un aliment ou une boisson à faire fonctionner le tube de production de micro-ondes à sa puissance maximale Pn pendant un temps au maximum égal à un temps de réchauffement de ce tube de production de micro-ondes ou l'un ou des accessoires d'alimentation et de refroidissement de ce tube de production de micro-ondes pris comme référence tels qu'un transformateur, c'est-à-dire le temps de montée de température, de sa ou leur température au repos à sa ou leur température limite prédéterminée de fonctionnement, et dans le reste de ce cycle de traitement, à faire travailler le tube de production de micro-ondes à une puissance préétablie de marche normale, inférieure à sa puissance maximale Pn.According to the invention, a method of controlling a microwave oven with a microwave production tube such as a magnetron consists in the start of a cycle of a treatment of a food or a drink with operate the microwave production tube at its maximum power Pn for a time at most equal to a heating time of this microwave production tube or one or more power and cooling accessories thereof microwave production tube taken as a reference such as a transformer, that is to say the temperature rise time, from its or their temperature at rest to its or their predetermined operating temperature limit, and in the rest of this treatment cycle, to work the microwave production tube at a preset normal power, lower than its maximum power Pn.

Dans le procédé de commande d'un four à micro-ondes à tube de production de micro-ondes tel qu'un magnétron, le temps de fonctionnement du tube de production de micro-ondes à sa puissance maximale Pn au début d'un cycle de traitement d'un aliment ou une boisson, est de préférence inférieur à une minute.In the method of controlling a microwave oven with a microwave production tube such as a magnetron, the operating time of the microwave production tube at its maximum power Pn at the start of a cycle processing a food or drink, is preferably less than a minute.

Dans un exemple de mise en oeuvre de l'invention illustré dans les figures 1 et 2, un four à micro-ondes 1 comprend dans son compartiment 3 un système de production de micro-ondes et de commande 5 ayant un magnétron 10 comme tube de production de micro-ondes.In an exemplary implementation of the invention illustrated in FIGS. 1 and 2, a microwave oven 1 comprises in its compartment 3 a system for producing and control 5 having a magnetron 10 as the microwave producing tube.

Dans ce système de production de micro-ondes et de commande 5, le magnétron 10 est alimenté en courant électrique à travers un transformateur 25 et un dispositif de commande 28 par une source de courant alternatif 30.In this microwave production and control system 5, the magnetron 10 is supplied with electric current through a transformer 25 and a control device 28 by an alternating current source 30.

Selon l'invention, dans le système de production de micro-ondes et de commande 5 du four à micro-ondes 1, le magnétron 10 qui est muni à ses bornes d'une diode de redressement 33, comprend d'une part une anode 35 qui reliée à la cathode de cette diode de redressement 33 est connectée à une première extrémité 36 d'un secondaire du transformateur 25 à travers d'abord l'une des deux condensateurs en parallèle et de valeurs différentes 38, 39 à savoir un condensateur à capacité plus faible 38 destiné à un fonctionnement du magnétron 10 à une puissance de marche normale préétablie inférieure à sa puissance maximale Pn et un condensateur à capacité plus forte 39 réservé à un fonctionnement du magnétron 10 à sa puissance maximale Pn et ensuite un commutateur 41 établissant une connexion électrique de l'un 38 ou l'autre 39 de ces deux condensateurs au secondaire de ce transformateur 25, et d'autre part une cathode 37 qui reliée à l'anode de cette diode de redressement 33 est branchée à une deuxième extrémité 40 de ce secondaire de ce transformateur 25.According to the invention, in the microwave production and control system 5 of the microwave oven 1, the magnetron 10 which is provided at its terminals with a rectifying diode 33, comprises on the one hand an anode 35 which connected to the cathode of this rectifier diode 33 is connected to a first end 36 of a secondary of the transformer 25 through first one of the two capacitors in parallel and of different values 38, 39 namely a capacitor with lower capacity 38 intended for operation of the magnetron 10 at a preset normal operating power lower than its maximum power Pn and a capacitor with higher capacity 39 reserved for operation of the magnetron 10 at its maximum power Pn and then a switch 41 establishing an electrical connection of one 38 or the other 39 of these two capacitors to the secondary of this transformer 25, and on the other hand a cathode 37 which connected to the anode of this re diode dressage 33 is connected to a second end 40 of this secondary of this transformer 25.

Le commutateur 41 est soit un commutateur électronique soit un commutateur électromécanique d'un type connu. Le commutateur 41 comprend trois bornes 44, 45, 46. La borne 44 est reliée à l'extrémité 36 du secondaire du transformateur 25 tandis que les bornes 45 et 46 sont respectivement reliées au condensateur 38 de fonctionnement du magnétron 10 à sa puissance de marche normale, et au condensateur 39 de fonctionnement du magnétron 10 à sa puissance maximale Pn.The switch 41 is either an electronic switch or an electromechanical switch of a known type. The switch 41 comprises three terminals 44, 45, 46. The terminal 44 is connected to the end 36 of the secondary of the transformer 25 while the terminals 45 and 46 are respectively connected to the operating capacitor 38 of the magnetron 10 at its operating power normal, and to the operating capacitor 39 of the magnetron 10 at its maximum power Pn.

Le commutateur 41 comprend un bouton de manoeuvre 50, une minuterie 51 et un dispositif de verrouillage 52 commandé par un capteur de température 53, lesquels permettent soit une déconnexion manuelle d'une liaison normale électrique 44, 45 et une connexion manuelle d'une liaison électrique à temps préréglé 44-46, c'est-à-dire un débranchement du magnétron 10 de sa liaison électrique permettant un fonctionnement à sa puissance de marche normale et un branchement du magnétron 10 sur une liaison électrique autorisant un fonctionnement à temps préréglé à sa puissance maximale Pn, quand la température de ce magnétron 10 ou de ses accessoires d'alimentation et de réfroidissement pris comme référence et saisie par le capteur thermique 53 est inférieure à sa ou leur température limite de fonctionnement, soit un blocage du bouton de manoeuvre 50, c'est-à-dire un maintien de cette liaison électrique normale 44-45 par le dispositif de verrouillage 52 quand la température de ce magnétron 10 ou de ses accessoires d'alimentation et de refroidissement pris comme référence et saisie par le capteur thermique 53, est égale ou supérieure à sa ou leur température limite de fonctionnement. Après un fonctionnement du magnétron 10 à temps préréglé à sa puissance maximale Pn à travers la liaison électrique 44- 46, le commutateur 41 est automatiquement rappelé dans sa liaison électrique normale 44-45.The switch 41 includes an operating button 50, a timer 51 and a locking device 52 controlled by a temperature sensor 53, which allow either manual disconnection of a normal electrical link 44, 45 and manual connection of an electrical link with preset time 44-46, that is to say a disconnection of the magnetron 10 of its electrical connection allowing operation at its normal operating power and connection of the magnetron 10 to an electrical connection allowing operation at a preset time at its maximum power Pn, when the temperature of this magnetron 10 or of its power accessories and cooling taken as a reference and entered by the thermal sensor 53 is lower than its operating temperature limit, that is to say a blocking of the operating button 50, that is to say a maintenance of this normal electrical connection 44-45 by the locking device 52 when the temperature of this magnetron 10 or of its supply and cooling accessories taken as reference e and entered by the thermal sensor 53, is equal to or greater than its operating temperature limit. After operation of the magnetron 10 at a preset time at its maximum power Pn through the electrical connection 44-46, the switch 41 is automatically recalled in its normal electrical connection 44-45.

Le dispositif de commande 28 du système de production de micro-ondes et de commande 5 du four 1 comprend en dehors du commutateur 41 décrit ci-dessus, un programmateur électronique ou électromécanique d'un type connu 55. Ce programmateur 55 est préprogrammé, assure par l'intermédiaire d'un bouton de manoeuvre 57 une mise sous tension ou hors tension d'un primaire du transformateur 25, par l'intermédiaire d'un bouton de manoeuvre 58 une sélection d'un traitement de décongélation, de réchauffage ou de cuisson suivant lequel a été établi un taux de marche moyen du magnétron, défini dans un paragraphe précédent, par l'intermédiaire d'un bouton de manoeuvre 59 un choix d'un temps de traitement et par l'intermédiaire d'un circuit électronique d'un type connu 60, une synchronisation de fonctionnement entre le programmateur 55 et le commutateur 41 lors d'un changement de puissance de fonctionnement du magnétron 10.The control device 28 of the microwave production and control system 5 of the oven 1 comprises, apart from the switch 41 described above, an electronic or electromechanical programmer of a known type 55. This programmer 55 is preprogrammed, ensures via an operating button 57 switching on or off a primary of the transformer 25, via an operating button 58 selecting a defrosting, reheating or heating treatment cooking according to which an average rate of operation of the magnetron has been established, defined in a previous paragraph, by means of an operating button 59 a choice of treatment time and by means of an electronic circuit d 'a known type 60, an operational synchronization between the programmer 55 and the switch 41 when the operating power of the magnetron 10 changes.

Dans un traitement d'un aliment ou une boisson, par exemple une cuisson rapide d'un plat ou un réchauffage rapide d'un thé, ce plat ou ce thé est entreposé dans le compartiment 6 du four à micro-ondes 1 puis le bouton 58 est mis dans sa position "cuisson" ou "réchauffage", le bouton 59 est tourné jusqu'à un emplacement d'un temps de traitement choisi, ensuite le bouton 50 est poussé dans sa position de fonctionnement à puissance maximale Pn du magnétron 10, et enfin le bouton 57 est basculé dans la position de mise sous tension ou marche du four 1. Le magnétron 10 ayant alors sa température au repos, émet à sa puissance maximale Pn des micro-ondes qui accélèrent la cuisson de ce plat ou le réchauffage de ce thé et se réchauffe d'une manière progressive. Cette lente montée de la température du magnétron est due à l'inertie thermique de sa masse.In a treatment of a food or a drink, for example a rapid cooking of a dish or a rapid reheating of a tea, this dish or this tea is stored in compartment 6 of the microwave oven 1 then the button 58 is put in its "cooking" or "reheating" position, the button 59 is turned to a location for a chosen treatment time, then the button 50 is pushed into its operating position at maximum power Pn of the magnetron 10 , and finally the button 57 is toggled in the power-on or on position of the oven 1. The magnetron 10 then having its temperature at rest, emits microwaves at its maximum power Pn which accelerate the cooking of this dish or the reheating of this tea and gradually heats up. This slow rise in the temperature of the magnetron is due to the thermal inertia of its mass.

Après un temps préréglé où la température du magnétron ou de l'un ou des accessoires d'alimentation et de refroidissement pris comme référence, atteint également sa ou leur température limite de fonctionnement, le commutateur 41 qui travaille en synchronisation avec le programmateur 55, change automatiquement la puissance de fonctionnement du magnétron 10 en débranchant le condensateur 39 de marche du magnétron à sa puissance maximale Pn et en connectant aussitôt le condensateur 38 de fonctionnement du magnétron 10 à sa puissance de marche normale, et maintient cette puissance de marche normale du magnétron 10 jusqu'à la fin du cycle de traitement c'est-à-dire à la fin de la cuisson du plat ou du réchauffage du thé.After a preset time when the temperature of the magnetron or of one or more supply and cooling accessories taken as reference, also reaches its operating temperature limit, the switch 41 which works in synchronization with the programmer 55, changes automatically the operating power of the magnetron 10 by unplugging the operating capacitor 39 of the magnetron to its maximum power Pn and immediately connecting the operating capacitor 38 of the magnetron 10 to its normal operating power, and maintaining this normal operating power of the magnetron 10 until the end of the processing cycle, i.e. at the end of cooking the dish or reheating the tea.

Si le temps choisi de traitement rapide est inférieur au temps de réchauffement du magnétron ou de l'un ou des accessoires d'alimentation et de refroidissement pris comme référence, à sa ou leur température limite de fonctionnement, le programmateur 55 arrête normalement le fonctionnement du four à la fin de ce temps de traitement choisi et simultanément le commutateur 41 est rappelé automatiquement dans sa liaison électrique normale 44-45, c'est-à-dire dans sa connexion avec le condensateur 38 de fonctionnement du magnétron 10 à sa puissance de marche normale. Dans ce cas, pendant tout ce temps choisi de traitement rapide, le magnétron 10 fonctionne à sa puissance maximale Pn.If the chosen rapid processing time is less than the heating time of the magnetron or of one or more supply and cooling accessories taken as reference, at its operating temperature limit (s), the programmer 55 normally stops the operation of the oven the end of this chosen treatment time and simultaneously the switch 41 is automatically recalled in its normal electrical connection 44-45, that is to say in its connection with the capacitor 38 operating the magnetron 10 at its normal operating power . In this case, during all this chosen rapid processing time, the magnetron 10 operates at its maximum power Pn.

Grâce à l'invention, le four à micro-ondes 1 a ainsi raccourci le temps de traitement des aliments ou boissons sans obliger le magnétron 10 et les accessoires d'alimentation et de refroidissement à fonctionner au-dessus de leur température limite de travail, par conséquent sans abréger leur durée de vie et sans compromettre la qualité du traitement.Thanks to the invention, the microwave oven 1 has thus shortened the time for processing food or drinks without forcing the magnetron 10 and the supply and cooling accessories to operate above their working limit temperature, therefore without shortening their lifespan and without compromising the quality of treatment.

Claims (4)

Four à micro-ondes à tube de production de micro-ondes tel qu'un magnétron, caractérisé en ce qu'il comprend un système de production de micro-ondes et de commande (5) ayant un magnétron (10) qui, muni d'une diode de redressement (33) à ses bornes, comporte d'une part une anode (35) reliée à la cathode de cette diode de redressement (33) et connectée à une première extrémité (36) d'un secondaire d'un transformateur (25) à travers d'abord l'un des deux condensateurs en parallèle de valeurs différentes (38, 39), à savoir un condensateur à capacité plus faible (38) destiné à un fonctionnement du magnétron (10) à une puissance de marche normale préétablie inférieure à sa puissance maximale Pn, et un condensateur à capacité plus forte (39) réservé à un fonctionnement du magnétron (10) à sa puissance maximale Pn et ensuite un commutateur (41) d'un dispositif de commande (28) de ce système de production de micro-ondes et de commande (5) établissant une connexion électrique de l'un (38) ou l'autre (39) de ces deux condensateurs ou secondaire de ce transformateur (25) et d'autre part une cathode (37) reliée à l'anode de cette diode de redressement (33) et branchée à une deuxième extrémité (40) de ce secondaire de ce transformateur (25).Microwave oven with microwave production tube such as a magnetron, characterized in that it comprises a microwave production and control system (5) having a magnetron (10) which, provided with a rectifier diode (33) at its terminals, comprises on the one hand an anode (35) connected to the cathode of this rectifier diode (33) and connected to a first end (36) of a secondary of a transformer (25) first through one of the two capacitors in parallel with different values (38, 39), namely a capacitor with lower capacity (38) intended for operation of the magnetron (10) at a power of normal preset operation lower than its maximum power Pn, and a higher capacity capacitor (39) reserved for operation of the magnetron (10) at its maximum power Pn and then a switch (41) of a control device (28) of this microwave production and control system (5) establishing a co electrical connection of one (38) or the other (39) of these two capacitors or secondary of this transformer (25) and on the other hand a cathode (37) connected to the anode of this rectifier diode (33 ) and connected to a second end (40) of this secondary of this transformer (25). Four selon la revendication 1, caractérisé en ce que dans le dispositif de commande (28) du système de production de micro-ondes et de commande (5), le commutateur (41) comprend d'une part trois bornes (44, 45, 46) dont l'une (44) est reliée à la première extrémité (36) du secondaire du transformateur (25) et les deux autres (45, 46) sont respectivement reliées aux deux condensateurs (38, 39) et d'autre part un bouton de manoeuvre (50), une minuterie (51) et un dispositif de verrouillage (52) commandé par un capteur de température (53), lesquels permettent: - soit une déconnexion manuelle d'une liaison électrique normale (44, 45) et une connexion manuelle d'une liaison électrique à temps préréglé (44-46) c'est-à-dire un débranchement du magnétron (10) de sa liaison électrique permettant un fonctionnement à sa puissance de marche normale et un branchement de ce magnétron (10) sur une liaison électrique autorisant un fonctionnement à temps préréglé à sa puissance maximale Pn, quand la température de ce magnétron (10) ou de ses accessoires d'alimentation et de refroidissement pris comme référence, et saisie par le capteur (53) est inférieure à sa ou leur température limite de fonctionnement, - soit un blocage du bouton de manoeuvre (50) c'est-à-dire un maintien de cette liaison électrique normale (44-45) par le dispositif de verrouillage (52) quand la température de ce magnétron (10) ou de ses accessoires d'alimentation et de refroidissement pris comme référence et saisie par le capteur (53) est égale ou supérieure à sa ou leur température limite de fonctionnement. Oven according to claim 1, characterized in that in the control device (28) of the microwave production and control system (5), the switch (41) comprises on the one hand three terminals (44, 45, 46) one of which (44) is connected to the first end (36) of the secondary of the transformer (25) and the other two (45, 46) are respectively connected to the two capacitors (38, 39) and on the other hand an operating button (50), a timer (51) and a locking device (52) controlled by a temperature sensor (53), which allow: - either a manual disconnection from a normal electrical connection (44, 45) and a manual connection of an electrical connection with preset time (44-46), that is to say a disconnection of the magnetron (10) from its electrical connection allowing operation at its normal operating power and a connection of this magnetron (10) to an electrical connection allowing operation at a preset time at its maximum power Pn, when the temperature of this magnetron (10) or of its supply and cooling accessories taken as a reference, and entered by the sensor (53) is lower than its operating temperature limit, - Or a blocking of the operating button (50), that is to say a maintenance of this normal electrical connection (44-45) by the locking device (52) when the temperature of this magnetron (10) or its supply and cooling accessories taken as a reference and entered by the sensor (53) is equal to or greater than its operating temperature limit. Four selon la revendication 2, caractérisé en ce que le commutateur (41) est, après un fonctionnement du magnétron (10) à temps préréglé à la puissance maximale à travers la liaison électrique (44-46), automatiquement rappelé dans sa liaison électrique normale (44-45).Oven according to claim 2, characterized in that the switch (41) is, after an operation of the magnetron (10) at preset time at maximum power through the electrical connection (44-46), automatically recalled in its normal electrical connection (44-45). Four selon l'une des revendications 2 et 3, ayant un programmateur (55) qui permet une mise sous tension ou hors tension d'un primaire du transformateur (25), une sélection d'un traitement de décongélation, de réchauffage ou de cuisson et un choix d'un temps de traitement, caractérisé en ce que le dispositif de commande (28) du système de production de micro-ondes et de commande (5), assure par l'intermédiaire d'un circuit électronique d'un type connu (60), une synchronisation de fonctionnement entre le programmateur (55) et le commutateur (41) lors d'un changement de puissance de fonctionnement du magnétron (10).Oven according to one of claims 2 and 3, having a programmer (55) which allows switching on or off a primary of the transformer (25), a selection of a defrosting, reheating or cooking treatment. and a choice of a processing time, characterized in that the control device (28) of the microwave production and control system (5), provides via an electronic circuit of a type known (60), an operating synchronization between the programmer (55) and the switch (41) during a change in operating power of the magnetron (10).
EP90403521A 1989-12-15 1990-12-11 Method and device for controlling a microwave oven Expired - Lifetime EP0433158B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8916613A FR2656191B1 (en) 1989-12-15 1989-12-15 METHOD FOR CONTROLLING A MICROWAVE OVEN AND MICROWAVE OVEN USING THE SAME.
FR8916613 1989-12-15

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EP0433158A1 true EP0433158A1 (en) 1991-06-19
EP0433158B1 EP0433158B1 (en) 1994-11-30

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EP90403521A Expired - Lifetime EP0433158B1 (en) 1989-12-15 1990-12-11 Method and device for controlling a microwave oven

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EP (1) EP0433158B1 (en)
AT (1) ATE114926T1 (en)
DE (1) DE69014570T2 (en)
DK (1) DK0433158T3 (en)
ES (1) ES2064694T3 (en)
FR (2) FR2656191B1 (en)
HK (1) HK34297A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2673801A1 (en) * 1991-03-08 1992-09-11 Thomson Electromenager Sa MICROWAVE OVEN WITH IMPROVED PERFORMANCE.
EP0655877A3 (en) * 1993-11-19 1995-10-18 Daewoo Electronics Co Ltd Device for preventing a high voltage transformer of a microwave oven from being overheated.
EP0921712A1 (en) * 1997-12-05 1999-06-09 STMicroelectronics S.A. Power-supply for a non linear load, especially for the magnetron of a microwave oven

Families Citing this family (2)

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CN101236404B (en) * 2008-02-29 2010-06-02 钱生宏 Time-delay switch controller
ES2392969B1 (en) * 2010-10-20 2013-10-25 Eika, S. Coop. Kitchen appliance comprising at least one radiant heater and a method of operation of said kitchen appliance

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US4356431A (en) * 1978-02-21 1982-10-26 Advance Transformer Company Magnetron energizing circuit
EP0192771A1 (en) * 1984-01-05 1986-09-03 Matsushita Electric Industrial Co., Ltd. Cooker with weight-detecting function
EP0239072A2 (en) * 1986-03-25 1987-09-30 Hitachi, Ltd. Switching power supply
EP0301805A1 (en) * 1987-07-27 1989-02-01 Matsushita Electric Industrial Co., Ltd. High-frequency heating apparatus
DE3741381A1 (en) * 1987-12-07 1990-03-01 Bosch Siemens Hausgeraete Circuit arrangement for controlling the microwave power in magnetrons

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FR2380653A1 (en) * 1977-02-10 1978-09-08 Philips Nv TEMPERATURE TRANSMISSION SYSTEM
US4356431A (en) * 1978-02-21 1982-10-26 Advance Transformer Company Magnetron energizing circuit
EP0192771A1 (en) * 1984-01-05 1986-09-03 Matsushita Electric Industrial Co., Ltd. Cooker with weight-detecting function
EP0239072A2 (en) * 1986-03-25 1987-09-30 Hitachi, Ltd. Switching power supply
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DE3741381A1 (en) * 1987-12-07 1990-03-01 Bosch Siemens Hausgeraete Circuit arrangement for controlling the microwave power in magnetrons

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2673801A1 (en) * 1991-03-08 1992-09-11 Thomson Electromenager Sa MICROWAVE OVEN WITH IMPROVED PERFORMANCE.
EP0504025A1 (en) * 1991-03-08 1992-09-16 Thomson Electromenager Microwave oven with improved performance
EP0655877A3 (en) * 1993-11-19 1995-10-18 Daewoo Electronics Co Ltd Device for preventing a high voltage transformer of a microwave oven from being overheated.
US5625520A (en) * 1993-11-19 1997-04-29 Daewoo Electronics Co., Ltd. Device for preventing a high voltage transformer of a microwave oven from being overheated
EP0921712A1 (en) * 1997-12-05 1999-06-09 STMicroelectronics S.A. Power-supply for a non linear load, especially for the magnetron of a microwave oven
FR2772208A1 (en) * 1997-12-05 1999-06-11 Sgs Thomson Microelectronics DEVICE FOR SUPPLYING A NON-LINEAR LOAD, IN PARTICULAR A MAGNETRON OF A MICROWAVE OVEN
US6049071A (en) * 1997-12-05 2000-04-11 Stmicroelectronics S.A. Device for the power supply of a non-linear load, especially a magnetron of a microwave oven

Also Published As

Publication number Publication date
FR2656191B1 (en) 1996-06-07
HK34297A (en) 1997-03-27
ATE114926T1 (en) 1994-12-15
DE69014570D1 (en) 1995-01-12
ES2064694T3 (en) 1995-02-01
EP0433158B1 (en) 1994-11-30
FR2656191A1 (en) 1991-06-21
FR2673349A1 (en) 1992-08-28
FR2673349B1 (en) 1993-07-16
DK0433158T3 (en) 1995-01-16
DE69014570T2 (en) 1995-04-13

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