EP0503898A1 - Heizgerät - Google Patents

Heizgerät Download PDF

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Publication number
EP0503898A1
EP0503898A1 EP92302032A EP92302032A EP0503898A1 EP 0503898 A1 EP0503898 A1 EP 0503898A1 EP 92302032 A EP92302032 A EP 92302032A EP 92302032 A EP92302032 A EP 92302032A EP 0503898 A1 EP0503898 A1 EP 0503898A1
Authority
EP
European Patent Office
Prior art keywords
heating
temperature
read
cooking chamber
voltage signal
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
EP92302032A
Other languages
English (en)
French (fr)
Other versions
EP0503898B1 (de
Inventor
Tamotsu Nagoya Works Takei
Nobuichi Nagoya Works Nishimura
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Publication of EP0503898A1 publication Critical patent/EP0503898A1/de
Application granted granted Critical
Publication of EP0503898B1 publication Critical patent/EP0503898B1/de
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
    • H05B6/68—Circuits for monitoring or control
    • H05B6/687—Circuits for monitoring or control for cooking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/02—Stoves or ranges heated by electric energy using microwaves
    • 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
    • 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
    • H05B6/66—Circuits
    • H05B6/68—Circuits for monitoring or control

Definitions

  • This invention relates to a heating apparatus wherein heating is executed based on heating constants such as a heating value, heating time period and the like set by a user.
  • a microwave oven with an oven function is generally provided with a temperature sensor sensing an atmospheric temperature in a cooking chamber.
  • a heating temperature and a time period of the heating operation are set by the user in the case of an oven cooking mode.
  • a control device of the microwave oven controls the output of an electric heater so that the temperature sensed by the temperature sensor reaches the set temperature.
  • a magnetron output and the heating operation time period are set by the user.
  • the temperature of food heated does not agree with the atmospheric temperature in the cooking chamber since food placed in the cooking chamber is directly heated by high frequency waves. Accordingly, the cooking chamber atmospheric temperature need not generally be set in the case of execution of range cooking mode.
  • the degree of heating of the food is influenced by an atmospheric temperature in a room where the microwave oven is disposed, as well as by an output value of and an operation period of the heating source. Accordingly, in the case of a microwave oven with a thawing function, not only heat by the magnetron but also heat due to the ambient temperature are applied to the food when the magnetron output is set to a small value with the ambient temperature high. As a result, the finishing of the thawing varies from case to case. Furthermore, in the case of a microwave oven with a fermenting function, the temperature at which the bread dough is fermented is affected by the room atmospheric temperature, which worsens the finishing of the bread.
  • a temperature sensor should be provided for sensing the room atmospheric temperature and that the thawing period or fermenting period in the range cooking mode should be compensated for based on the temperature sensed by the temperature sensor. More specifically, when the room atmospheric temperature is high, the actual thawing or fermenting period is rendered shorter than the period set by the user so that the influence by the room atmospheric temperature is canceled, thereby preventing variations in the finishing of the food.
  • an object of the present invention is to provide a heating apparatus wherein the heating is executed based on the heating constants set by the user and an arrangement for sensing the ambient temperature and compensating for the heating constants can be actualized without the increase in the production cost and complication of the circuit arrangement.
  • Another object of the invention is to provide a heating apparatus wherein the oven cooking by the use of the electric heater and the range cooking by the use of the magnetron are executed based on the heating constants set by the user and the arrangement for sensing the ambient temperature to compensate for the heating constants can be attained without the increase in the production cost and a complicated circuit arrangement.
  • the present invention provides a heating apparatus comprising a cooking chamber, first heating means for heating food accommodated in the cooking chamber, second heating means for heating the food accommodated in the cooking chamber, a temperature sensor sensing an atmospheric temperature in the cooking chamber to thereby generate a voltage signal according to the sensed temperature, and first heating execution means for controlling an output of the first heating means based on the voltage signal supplied thereto from the temperature sensor upon receipt of a start command, thereby executing the heating, characterized by temperature reading means for reading the voltage signal from the temperature sensor at predetermined intervals in the condition that both of the first and second heating means are deenergized, first storage means for storing data of read temperature corresponding to the voltage signal read by the temperature reading means, temperature determining means for calculating the difference between the temperature whose data is stored in the first storage means and the temperature read by the temperature reading means, second storage means for storing data of the temperature read by the temperature reading means when the temperature difference calculated by the temperature determining means is with a predetermined range, heating constant setting means for setting heating constants determining
  • the invention provides a heating apparatus comprising a cooking chamber, first heating means for heating food accommodated in the cooking chamber, second heating means for heating the food accommodated in the cooking chamber, a temperature sensor sensing an atmospheric temperature in the cooking chamber to thereby generate a voltage signal according to the sensed temperature, and first heating execution means for controlling an output of the first heating means based on the voltage signal supplied thereto from the temperature sensor upon receipt of a start command, thereby executing the heating, characterized by temperature gradient determining means for differentiating the voltage signal from the temperature sensor to thereby generate a differentiation signal, first storage means, temperature determining means storing, in the first storage means, read data of the temperature corresponding to the temperature signal from the temperature sensor when the rate of change of the temperature corresponding to the differentiation signal from the temperature differentiating means is smaller than a predetermined value in the condition that both of the first and second heating means are deenergized, heating constant setting means for setting heating constants determining a volume of output of the second heating means, and second heating execution means for compensating for the heating constant
  • a door 1a is mounted on the front side of an outer casing 1 of the microwave oven.
  • An operation panel 2 is also mounted on the front side of the outer casing 1.
  • the operation panel 2 comprises a plurality of operation switches 3 including an oven cooking start button, a range cooking start button, a cancel button, a heating constant setting switch and the like, a time adjusting knob 4 and a display 5.
  • a cooking chamber 6 defined in the outer casing 1 is closed and opened by the door 1a.
  • a turntable 7 is rotatably mounted in the cooking chamber 6.
  • a thermistor 8 serving as a temperature sensor is mounted on an inner side wall of the cooking chamber 6.
  • the thermistor 8 is connected at one of two ends to a DC power line and is grounded at the other end via a resistance 9.
  • the common node of the thermistor 8 and the resistance 9 is connected to an input terminal of a control device 10.
  • the thermistor 8 has a negative characteristic that the resistance value is reduced with the raise of the temperature and accordingly, the signal level of a voltage signal V s generated by the thermistor 8 is raised with the raise of the atmospheric temperature in the cooking chamber 6.
  • the control device 10 comprises a central processing unit (CPU) 11, an analog-to-digital (A/D) converter 12, a timer 13, a first memory 14a serving as first storage means, a second memory 14b serving as second storage means and the like.
  • CPU 11 serves as first heating execution means, second heating execution means, temperature reading means and temperature determining means.
  • the voltage signal V s from the thermistor 8 is supplied to the A/D converter 12.
  • the analog voltage signal V s is converted to a corresponding digital signal by the A/D converter 12 and the digital signal is delivered to CPU 11.
  • a time interval is set in the timer 13.
  • the timer 13 operates to inform CPU 11 that it has been timed up every time the set time interval is timed up.
  • the time interval set in the timer 13 is a time factor for determining the gradient of the cooking chamber 6 atmospheric temperature form the temperature sensed by the thermistor 8.
  • CPU 11 reads the voltage signal V s from the A/D converter 12 at the timing that the timer 13 is timed up. CPU 11 then operates so that the read temperature Ta corresponding to the voltage signal V s read by CPU 11 is stored in the first memory 14a. When a predetermined condition is met, CPU 11 operates so that the read temperature is stored in the second memory 14b.
  • the temperature stored in the first memory 14a will be referred to as “stored temperature Tb" and the temperature stored in the second memory 14b will be referred to as "stored temperature Tc.”
  • step S1 when the microwave oven is connected to the commercial power supply (step S1), CPU 11 operates to set the time interval in the timer 13 (step S2). CPU 11 then operates to read the voltage signal V s from the thermistor 8 through the A/D converter 12 (step S3) and to store the read temperature Ta corresponding to the read voltage signal V s in the first memory 14a (step S4).
  • CPU 11 determines whether or not the range cooking start command or the oven cooking start command has been inputted from the operation panel 2 (steps S5 and S6). When neither command has been inputted, CPU 11 determines whether the cooking has been completed or not (step S7). Since it is not the timing that the cooking is completed, CPU 11 advances from step S7 to step S11 where it is determined that the cooking is not being performed. Subsequently, CPU 11 advances to step S12 where it is determined whether the timer 13 has been timed up or not. When the timer 13 is not timed up, CPU 11 returns to step S5.
  • step S12 reads the voltage signal V s from the thermistor 8 at step S13.
  • CPU 11 then reads the stored temperature Tb from the first memory 14a (step S14) and operates to subtract the stored temperature Tb from the read temperature Ta corresponding to the read voltage signal V s (step S15) and determines whether or not the temperature difference between the read temperature Ta and the stored temperature Tb is within ⁇ T (step S16).
  • step S16 it is determined whether or not the cooking chamber 6 atmospheric temperature corresponds to the room atmospheric temperature.
  • the cooking chamber atmospheric temperature corresponds to the room atmospheric temperature when Tb-Ta> ⁇ T
  • the read temperature Ta is stored as the room temperature data in the second memory 14b. Since the atmospheric temperature in the cooking chamber 6 agrees approximately to the room atmospheric temperature and does not change immediately after power supply, CPU 11 advances from step S16 to step S17 where the read temperature Tb is stored in the second memory 14b. Then, the read temperature Ta is stored in the first memory 14a at step S18 and CPU 11 returns to step S5. Consequently, the room atmospheric temperature taking the approximately same value as the read temperature Ta is stored in the first and second memories 14a, 14b.
  • step S5 Upon operation of a start button (not shown) for the thawing which is included in the range cooking mode, CPU 11 answers in the affirmative (step S5) to execute a range cooking routine as shown in FIG. 6. More specifically, the stored temperature Tc is read from the second memory 14b (step S101) and the heating constants such as the heating level, heating period and the like externally set via the operation panel 2 are read (step S102). CPU 11 then operates to compensate for the read heating constants based on the stored temperature Tc (step S103) and to control the output of the magnetron 16 based on the compensated heating constants (step S104). In this case the heating constants are compensated for so that the output of the magnetron 16 is reduced as the stored temperature Tc or the room atmospheric temperature becomes higher.
  • the heating constants are compensated for so that the output of the magnetron 16 is reduced as the stored temperature Tc or the room atmospheric temperature becomes higher.
  • CPU 11 upon operation of the oven cooking start button on the operation panel 2, CPU 11 answers in the affirmative at step S6 and executes an oven cooking routine as shown in FIG. 7. More specifically, the heating constants such as the heating temperature, heating period and the like externally set via the operation panel 2 are read (step S201) and the voltage signal V s from the thermistor 8 is read (step S202). CPU 11 then operates to control the output of the electric heater 15 so that the cooking chamber atmospheric temperature sensed by the thermistor 8 reaches the heating temperature set by the user (step S203).
  • the heating constants such as the heating temperature, heating period and the like externally set via the operation panel 2 are read (step S201) and the voltage signal V s from the thermistor 8 is read (step S202).
  • CPU 11 then operates to control the output of the electric heater 15 so that the cooking chamber atmospheric temperature sensed by the thermistor 8 reaches the heating temperature set by the user (step S203).
  • CPU 11 advances from step S11 to step S19 where it is determined whether the cancel button on the operation panel 2 has been operated or not.
  • CPU 11 advances from step S19 to step S20 where the voltage signal V s from the thermistor 8 is read.
  • CPU 11 then operates to store the read temperature Ta corresponding to the read voltage signal V s in the first memory 14a (step S21). Subsequently, CPU 11 operates to clear the heating constants read from the operation panel 2 (step S22) and returns to step S5.
  • CPU 11 Upon completion of the heating based on the heating constants set as described above, CPU 11 advances from step S7 to step S8 where the voltage signal V s from the thermistor 8 is read and the read temperature Ta corresponding to the read voltage signal V s is stored in the first memory 14a (step S9). CPU 11 then operates to clear the heating constants set by the user (step S10) and advances to step S11. Since the cooking has been completed, CPU 11 advances from step S11 to step S12 where it is determined whether the timer 13 has been timed up or not. CPU 11 returns to step S5 when the timer 13 is not timed up.
  • FIG. 8 shows the change in the atmospheric temperature in the cooking chamber (the temperature sensed by the thermistor 8) 6 when the heating is executed.
  • the atmospheric temperature in the cooking chamber 6 agrees approximately with the room atmospheric temperature since the microwave oven remains in the condition of stop of the heating operation for a long period until the heating is initiated.
  • the atmospheric temperature in the cooking chamber 6 is rapidly raised to be maintained at the set temperature.
  • the atmospheric temperature in the cooking chamber 6 begins to rapidly drop and the degree of temperature drop becomes gentle with lapse of time.
  • the atmospheric temperature in the cooking chamber 6 agrees approximately with the room atmospheric temperature.
  • step S16 the read temperature Ta is stored in the second memory 14b and the read temperature Ta is stored in the first memory 14a (step S18).
  • step S15 the room atmospheric temperature is stored in the second memory 14b and the heating constants are compensated for based on the room atmospheric temperature stored in the second memory 14b when the next range cooking is to be executed.
  • the read temperature Ta is assumed to be the room atmospheric temperature and stored in the second memory 14b.
  • the heating constants set by the user is compensated for based on the stored temperature Tc stored in the second memory 14b.
  • the range cooking can be executed without influence of the ambient temperature. Accordingly, since the room atmospheric temperature can be sensed by use of the thermistor 8 provided for sensing the atmospheric temperature in the cooking chamber 6. Consequently, the electrical arrangement of the microwave oven can be simplified as compared with the conventional arrangement that an additional temperature sensor is provided for sensing the room atmospheric temperature.
  • a differentiation circuit may be provided for generating a differentiation signal of the voltage signal V s from the thermistor 8, instead and the atmospheric temperature in the cooking chamber 6 may be looked upon as the room atmospheric temperature when the signal level of the differentiation signal from the differentiation circuit takes a predetermined value or below.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
EP92302032A 1991-03-15 1992-03-10 Heizgerät Expired - Lifetime EP0503898B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3076939A JP2911245B2 (ja) 1991-03-15 1991-03-15 電子レンジ
JP76939/91 1991-03-15

Publications (2)

Publication Number Publication Date
EP0503898A1 true EP0503898A1 (de) 1992-09-16
EP0503898B1 EP0503898B1 (de) 1994-12-28

Family

ID=13619713

Family Applications (1)

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EP92302032A Expired - Lifetime EP0503898B1 (de) 1991-03-15 1992-03-10 Heizgerät

Country Status (4)

Country Link
EP (1) EP0503898B1 (de)
JP (1) JP2911245B2 (de)
KR (1) KR960001675B1 (de)
DE (1) DE69200979T2 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2127064A1 (es) * 1995-07-25 1999-04-01 Hernandez Enrique Cuervo Perfeccionamientos en los aparatos calentadores de cera depilatoria.
WO1999066767A1 (en) * 1998-06-19 1999-12-23 Microwave Science, Llc Method and apparatus for managing the thermal activity of a microwave oven
US7405610B2 (en) * 2005-06-22 2008-07-29 Denso Corporation Temperature compensation circuit
EP2053315A3 (de) * 2007-10-26 2011-03-16 Rational AG Verfahren zur Erkennung des Beladungszustandes eines Gargerätes zum Mikrowellengaren und Gargerät zur Durchführung solch eines Verfahrens
EP2587168A1 (de) * 2005-09-23 2013-05-01 LG Electronics, Inc. Mikrowellenofen mit einem Fermenter
CN103175237A (zh) * 2013-03-27 2013-06-26 福州高奇智芯电源科技有限公司 微波炉及其自适应功率输出控制方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0213442A1 (de) * 1985-08-06 1987-03-11 Bosch-Siemens HausgerÀ¤te GmbH Anordnung zum Ansteuern von Herden mit Mikrowellenenergie und/oder Wärmeenergie
EP0274904A1 (de) * 1986-12-27 1988-07-20 Sharp Kabushiki Kaisha Mikrowellenofen
GB2200805A (en) * 1987-01-23 1988-08-10 Sharp Kk Microwave oven with heating chamber temperature detecting circuit
EP0394009A2 (de) * 1989-04-19 1990-10-24 Matsushita Electric Industrial Co., Ltd. Heizgerät

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0213442A1 (de) * 1985-08-06 1987-03-11 Bosch-Siemens HausgerÀ¤te GmbH Anordnung zum Ansteuern von Herden mit Mikrowellenenergie und/oder Wärmeenergie
EP0274904A1 (de) * 1986-12-27 1988-07-20 Sharp Kabushiki Kaisha Mikrowellenofen
GB2200805A (en) * 1987-01-23 1988-08-10 Sharp Kk Microwave oven with heating chamber temperature detecting circuit
EP0394009A2 (de) * 1989-04-19 1990-10-24 Matsushita Electric Industrial Co., Ltd. Heizgerät

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2127064A1 (es) * 1995-07-25 1999-04-01 Hernandez Enrique Cuervo Perfeccionamientos en los aparatos calentadores de cera depilatoria.
US6249710B1 (en) 1996-05-14 2001-06-19 Microwave Science, Llc Method and apparatus for managing the thermal activity of a microwave oven
WO1999066767A1 (en) * 1998-06-19 1999-12-23 Microwave Science, Llc Method and apparatus for managing the thermal activity of a microwave oven
US7405610B2 (en) * 2005-06-22 2008-07-29 Denso Corporation Temperature compensation circuit
EP2587168A1 (de) * 2005-09-23 2013-05-01 LG Electronics, Inc. Mikrowellenofen mit einem Fermenter
US8883234B2 (en) 2005-09-23 2014-11-11 Lg Electronics Inc. Fermenter and microwave oven having the same, their controlling method
EP2053315A3 (de) * 2007-10-26 2011-03-16 Rational AG Verfahren zur Erkennung des Beladungszustandes eines Gargerätes zum Mikrowellengaren und Gargerät zur Durchführung solch eines Verfahrens
CN103175237A (zh) * 2013-03-27 2013-06-26 福州高奇智芯电源科技有限公司 微波炉及其自适应功率输出控制方法
CN103175237B (zh) * 2013-03-27 2015-07-15 福州高奇智芯电源科技有限公司 微波炉及其自适应功率输出控制方法

Also Published As

Publication number Publication date
EP0503898B1 (de) 1994-12-28
DE69200979T2 (de) 1995-06-29
JP2911245B2 (ja) 1999-06-23
KR960001675B1 (ko) 1996-02-03
KR920018410A (ko) 1992-10-22
DE69200979D1 (de) 1995-02-09
JPH04288414A (ja) 1992-10-13

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