EP0433158B1 - Procédé de commande d'un four à micro-ondes, et four à micro-ondes mettant en oeuvre de ce procédé - Google Patents

Procédé de commande d'un four à micro-ondes, et four à micro-ondes mettant en oeuvre de ce procédé Download PDF

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Publication number
EP0433158B1
EP0433158B1 EP90403521A EP90403521A EP0433158B1 EP 0433158 B1 EP0433158 B1 EP 0433158B1 EP 90403521 A EP90403521 A EP 90403521A EP 90403521 A EP90403521 A EP 90403521A EP 0433158 B1 EP0433158 B1 EP 0433158B1
Authority
EP
European Patent Office
Prior art keywords
magnetron
power
microwave
operating
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.)
Expired - Lifetime
Application number
EP90403521A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0433158A1 (fr
Inventor
Gérard Pressouyre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TEM ELECTROMENAGER
Original Assignee
TEM ELECTROMENAGER
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Publication date
Application filed by TEM ELECTROMENAGER filed Critical TEM ELECTROMENAGER
Publication of EP0433158A1 publication Critical patent/EP0433158A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 supplying 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.
  • European patent application EP-A-0 301 805 describes another solution for optimizing the performance and the costs of a microwave oven, consisting in operating the magnetron, at the start of a cooking operation. , at a power greater than the normal operating power over a period during which the temperature of the various components does not exceed a limit temperature.
  • the microwave oven described uses a semiconductor electric power converter element whose operation is controlled by a control section.
  • European patent application EP-A-0 192 771 describes a microwave oven equipped with an automatic device for weighing the elements which controls a circuit for controlling the output power of a magnetron. More specifically, the automatic weighing device controls a switch which establishes a serial electrical connection between the magnetron and the secondary of a transformer through one or two capacitors placed in parallel, so that the magnetron delivers a first or a second power of values determined by the capacitive values of the capacitors used.
  • the subject of the invention is therefore a microwave oven as defined in claims 1 to 3.
  • 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 flow 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 approximately 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 in 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 processing 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 makes it possible to avoid 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 running power, less 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 a lower capacity 38 intended for an operation of the magnetron 10 at a preset normal operating power lower than its maximum power Pn and a capacitor with a higher capacity 39 reserved for an 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 comprises 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 connection 44, 45 and manual connection of an electrical connection 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 its power accessories and cooling taken as a reference and entered by the thermal 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 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 firing 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 operating 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 placed 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 disconnecting the operating capacitor 39 from the magnetron to its maximum power Pn and immediately connecting the operating capacitor 38 from 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 the treatment.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
EP90403521A 1989-12-15 1990-12-11 Procédé de commande d'un four à micro-ondes, et four à micro-ondes mettant en oeuvre de ce procédé Expired - Lifetime EP0433158B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8916613 1989-12-15
FR8916613A FR2656191B1 (fr) 1989-12-15 1989-12-15 Procede de commande d'un four a micro-ondes et four a micro-ondes mettant en óoeuvre ce procede.

Publications (2)

Publication Number Publication Date
EP0433158A1 EP0433158A1 (fr) 1991-06-19
EP0433158B1 true EP0433158B1 (fr) 1994-11-30

Family

ID=9388552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90403521A Expired - Lifetime EP0433158B1 (fr) 1989-12-15 1990-12-11 Procédé de commande d'un four à micro-ondes, et four à micro-ondes mettant en oeuvre de ce procédé

Country Status (7)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101236404B (zh) * 2008-02-29 2010-06-02 钱生宏 一种延时切换控制器

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2673801A1 (fr) * 1991-03-08 1992-09-11 Thomson Electromenager Sa Four a micro-ondes a performance amelioree.
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
FR2772208B1 (fr) * 1997-12-05 2000-02-25 Sgs Thomson Microelectronics Dispositif d'alimentation d'une charge non lineaire, notamment un magnetron d'un four a micro-ondes
ES2392969B1 (es) * 2010-10-20 2013-10-25 Eika, S. Coop. Aparato de cocina que comprende al menos un calefactor radiante y un método de funcionamiento de dicho aparato de cocina

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE404108B (sv) * 1977-02-10 1978-09-18 Philips Svenska Ab Anordning for overvakning av temperaturen hos en elektrisk komponent
US4356431A (en) * 1978-02-21 1982-10-26 Advance Transformer Company Magnetron energizing circuit
DE3480295D1 (en) * 1984-01-05 1989-11-30 Matsushita Electric Industrial Co Ltd Cooker with weight-detecting function
US4777575A (en) * 1986-03-25 1988-10-11 Hitachi Ltd. Switching power supply
KR910006174B1 (ko) * 1987-07-27 1991-08-16 마쯔시다덴기산교 가부시기가이샤 고주파가열장치
DE3741381A1 (de) * 1987-12-07 1990-03-01 Bosch Siemens Hausgeraete Schaltungsanordnung zur mikrowellen-leistungssteuerung bei magnetrons

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101236404B (zh) * 2008-02-29 2010-06-02 钱生宏 一种延时切换控制器

Also Published As

Publication number Publication date
FR2673349B1 (fr) 1993-07-16
FR2673349A1 (fr) 1992-08-28
DK0433158T3 (da) 1995-01-16
EP0433158A1 (fr) 1991-06-19
ES2064694T3 (es) 1995-02-01
DE69014570D1 (de) 1995-01-12
FR2656191A1 (fr) 1991-06-21
HK34297A (en) 1997-03-27
FR2656191B1 (fr) 1996-06-07
DE69014570T2 (de) 1995-04-13
ATE114926T1 (de) 1994-12-15

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