EP0283182A1 - Mikrowellenofen - Google Patents

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Publication number
EP0283182A1
EP0283182A1 EP88301959A EP88301959A EP0283182A1 EP 0283182 A1 EP0283182 A1 EP 0283182A1 EP 88301959 A EP88301959 A EP 88301959A EP 88301959 A EP88301959 A EP 88301959A EP 0283182 A1 EP0283182 A1 EP 0283182A1
Authority
EP
European Patent Office
Prior art keywords
setting
level
microwave energy
time
microwave
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.)
Withdrawn
Application number
EP88301959A
Other languages
English (en)
French (fr)
Inventor
Gary Whittaker
Gordon Andrews
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.)
New World Domestic Appliances Ltd
Original Assignee
New World Domestic Appliances Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by New World Domestic Appliances Ltd filed Critical New World Domestic Appliances Ltd
Publication of EP0283182A1 publication Critical patent/EP0283182A1/de
Withdrawn legal-status Critical Current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
    • H05B6/647—Aspects related to microwave heating combined with other heating techniques
    • H05B6/6482—Aspects related to microwave heating combined with other heating techniques combined with radiant heating, e.g. infrared heating
    • 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
    • H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
    • H05B6/645—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors using temperature sensors

Definitions

  • This invention relates to microwave ovens and more particularly to so-called combination microwave ovens which incorporate a source of convection hot air in addition to the source of microwave energy.
  • Combination microwave ovens are known in which hot air derived either from an electrical heater or from a gas burner is used in conjunction with the microwave energy in order to cook food placed in the oven.
  • the hot air is conveniently circulated in the oven by means of a fan therein.
  • Such combination microwave ovens are claimed to cook food better than straightforward microwave ovens.
  • it is necessary for any particular food item being cooked to preset the level of the microwave energy to be used, to preset the temperature or the gas mark setting of the hot air source and also to preset the time the cooking operation is to take.
  • a microwave oven comprising a source of microwave energy, a source of hot air, and control means for setting the effective temperature of said source of hot air, means being provided for automatically setting the level of the microwave energy in dependence upon the setting of said control means.
  • timer means will be provided for pre-setting the cook time of a cooking operation, the means for automatically setting the level of microwave energy being arranged to vary the setting of the microwave energy during said cook time in dependence upon the setting of said control means.
  • means for subdividing the preset cook time into a plurality of time periods, and in which the means for automatically setting the level of microwave energy is arranged to automatically set the level of microwave energy in each of said time periods, the level of microwave energy in at least one of said time periods being dependent upon the setting of said control means.
  • the cook time will be sub-divided into four time periods, a first time period corresponding to the first 20% of the preset cook time, a second time period corresponding to the next 30% of the preset cook time, a third time period corresponding to the next 30% of the preset cook time and a fourth time period corresponding to the next 20% of the preset cook time.
  • the level of microwave energy is set independent of the setting of said control means, and in the other of said time periods the level of microwave energy is set in dependence upon the setting of said control means.
  • the level of microwave energy is set to 85% of maximum
  • the level of microwave energy is set to between 20% and 70% of said maximum dependent upon the setting of said control means
  • the level of microwave energy is set to between 10% and 40% of said maximum dependent upon the setting of said control means
  • the level of microwave energy is set to 10% of said maximum.
  • the source of hot air may comprise an electric heater, in which case the control means may comprise a temperature thermostat control, or it may comprise a gas burner, in which case the control means may comprise a gas mark thermostat control.
  • a fan may also be provided for circulating the hot air.
  • Fig. 1 of the drawing there is depicted a front view of a combination microwave oven 1 having a front, side-hung door 2 which is shown in the open position to reveal an oven cavity 3.
  • the microwave oven 1 is provided with a magnetron shown diagrammatically in dashed lines at 4, for transmitting into the oven cavity 3 microwave radiation.
  • the microwave oven 1 is also provided in the floor of the cavity 3 and towards the rear thereof with a gas burner 5, which constitutes a source of hot air for the cavity 3.
  • any food placed in the combination microwave oven 1 may be cooked by using a combination of microwave energy from the magnetron 4 and hot air from the gas burner 5.
  • Such an arrangement is advantageous in that the hot air from the gas burner 5 has a browning effect on any food in the oven cavity 3.
  • the cavity 3 is also provided in the rear wall thereof with a fan 6 for providing for forced circulation of the hot air from the gas burner 5.
  • the provision of the fan 6 is optional and also, in place of the gas burner 5, one or more electric heaters, shown in dashed lines at 7, may be provided.
  • the microwave oven 1 shown in Fig. 1. is provided with a microprocessor controlled timer 8 for controlling the operation thereof, the timer 8 being provided with four push button controls 9 and a digital display 10.
  • the timer 8 may be used for pre-setting the "cook time” of the microwave oven 1 in the conventional way.
  • the microwave oven is also provided with a gas mark thermostat control 11 for controlling the gas burner 5, the gas mark thermostat control 11 comprising "UP" and "DOWN” push buttons 12 and also a digital display 13 for indicating the actual gas mark setting.
  • the micro­processor (not shown) of the timer 8 incorporates a software program which takes account of the setting of the gas mark thermostat control 11 and also the preset "cook time” in order to set the level of the microwave energy.
  • the microprocessor is programmed to sub-divide the "cook time" into four time periods corresponding to 20%, 30%, 30% and 20% of the cook time, respectively, as shown in Fig. 2 of the accompanying drawing, and is also programmed to set the level of the microwave energy in each of the four time periods as follows:
  • the number of time periods that the "cook time” is sub-divided into and also the microwave energy levels that are set for each of the time periods are exemplary only and other than four time periods and different microwave energy levels may be used as required.
  • microprocessor control will be expanded to introduce "weight-volume-­food type” program information into the microprocessor, so that the microwave oven may additionally be provided with “fully automatic cook” and "microwave only defrost” modes.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
EP88301959A 1987-03-10 1988-03-07 Mikrowellenofen Withdrawn EP0283182A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8705596 1987-03-10
GB8705596A GB2202117B (en) 1987-03-10 1987-03-10 Microwave ovens

Publications (1)

Publication Number Publication Date
EP0283182A1 true EP0283182A1 (de) 1988-09-21

Family

ID=10613657

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88301959A Withdrawn EP0283182A1 (de) 1987-03-10 1988-03-07 Mikrowellenofen

Country Status (2)

Country Link
EP (1) EP0283182A1 (de)
GB (1) GB2202117B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0845923A2 (de) * 1996-11-28 1998-06-03 Stoves PLC Kochgerät

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470942A (en) * 1966-12-10 1969-10-07 Sanyo Electric Co Microwave heating apparatus and method
FR2335799A1 (fr) * 1975-12-19 1977-07-15 Elektromaschinen Ag Four a micro-ondes et a air chaud
GB2037100A (en) * 1978-01-30 1980-07-02 Matsushita Electric Ind Co Ltd High-frequency heater
GB2042858A (en) * 1979-01-25 1980-09-24 Rinnai Kk Cooking apparatus
GB2168503A (en) * 1984-12-14 1986-06-18 Sharp Kk Control of a heating appliance
EP0187543A2 (de) * 1985-01-03 1986-07-16 Microwave Ovens Limited Mikrowellenherd und Verfahren zur Zubereitung von Speisen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470942A (en) * 1966-12-10 1969-10-07 Sanyo Electric Co Microwave heating apparatus and method
FR2335799A1 (fr) * 1975-12-19 1977-07-15 Elektromaschinen Ag Four a micro-ondes et a air chaud
GB2037100A (en) * 1978-01-30 1980-07-02 Matsushita Electric Ind Co Ltd High-frequency heater
GB2042858A (en) * 1979-01-25 1980-09-24 Rinnai Kk Cooking apparatus
GB2168503A (en) * 1984-12-14 1986-06-18 Sharp Kk Control of a heating appliance
EP0187543A2 (de) * 1985-01-03 1986-07-16 Microwave Ovens Limited Mikrowellenherd und Verfahren zur Zubereitung von Speisen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0845923A2 (de) * 1996-11-28 1998-06-03 Stoves PLC Kochgerät
EP0845923A3 (de) * 1996-11-28 1998-11-18 Stoves PLC Kochgerät
US6005229A (en) * 1996-11-28 1999-12-21 Stoves Plc Cooking oven including a convection heat source and a microwave heat source

Also Published As

Publication number Publication date
GB2202117B (en) 1990-05-16
GB2202117A (en) 1988-09-14
GB8705596D0 (en) 1987-04-15

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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