WO2011070721A1 - 高周波加熱装置及び高周波加熱方法 - Google Patents
高周波加熱装置及び高周波加熱方法 Download PDFInfo
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- WO2011070721A1 WO2011070721A1 PCT/JP2010/006581 JP2010006581W WO2011070721A1 WO 2011070721 A1 WO2011070721 A1 WO 2011070721A1 JP 2010006581 W JP2010006581 W JP 2010006581W WO 2011070721 A1 WO2011070721 A1 WO 2011070721A1
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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
- H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or 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
- H05B6/70—Feed lines
-
- 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
- H05B6/70—Feed lines
- H05B6/705—Feed lines using microwave tuning
-
- 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
- H05B6/72—Radiators or antennas
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Definitions
- the present invention relates to a high-frequency heating apparatus and a high-frequency heating method for heating an object to be heated housed in a heating chamber.
- a local treatment according to the state and shape of the object to be heated is performed for the purpose of improving heating efficiency and eliminating uniform heating.
- Various techniques for stirring heating and radiation of high-frequency power into the heating chamber are disclosed.
- Patent Document 1 discloses a microwave oven having a radiation antenna on the outer periphery of a radiation antenna.
- this microwave oven by rotating the radiation antenna, the state where the radiation antenna and the radiation antenna are coupled at high frequency and the state where they are not coupled at high frequency are controlled, and the apparent antenna size is changed.
- the state in which the microwaves are intensively supplied to a narrow range and the state in which the microwaves are uniformly supplied to the heating chamber are controlled.
- Patent Document 2 discloses a means for detecting the temperature distribution of an object to be heated and a microwave oven provided with a plurality of rotating antennas. In this microwave oven, the temperature distribution of the object to be heated is detected, the part to be heated is determined based on the detected temperature distribution information, the rotating antenna is rotated, and the directivity of the antenna is controlled.
- Patent Document 3 a plurality of planar antennas are provided, the phase of the microwaves supplied to the planar antennas is changed with time, and the directivity of the microwaves radiated from the planar antennas is changed.
- a microwave oven that stirs microwaves without use is disclosed.
- Patent Document 3 since the directivity of the microwave is electrically controlled, the above-described unstable elements due to the mechanical configuration and the configuration that causes an increase in the size of the apparatus can be avoided. .
- the microwave when the microwave is stirred, the distribution of the electromagnetic field intensity in the entire heating chamber is uniformly distributed regardless of the shape of the object to be heated. That is, since the intensive heating is not performed on the region where the object to be heated exists, the waste of the microwave is increased, and the heating efficiency is not directly improved. That is, it takes a long time to heat the object to be heated.
- the microwave radiated from the antenna is complicatedly reflected in the heating chamber.
- the behavior of the microwave radiated from the antenna is greatly different from the directivity in the far solution in the free space. Therefore, it is difficult to control the heating distribution by controlling the directivity of the antenna.
- the present invention solves the above-described conventional problems.
- a high-frequency heating apparatus that heats an object to be heated accommodated in a heating chamber
- the object to be heated is efficiently and uniformly heated according to the shape of the object to be heated.
- An object of the present invention is to provide a high-frequency heating apparatus and a high-frequency heating method that can be performed.
- a high-frequency heating device is a high-frequency heating device that heats an object to be heated stored in a heating chamber, and a high-frequency power generation unit that generates high-frequency power;
- the phase variable unit that changes the phase of the high-frequency power generated by the high-frequency power generation unit and the phase variable unit that is disposed on the same surface in the heating chamber and has a predetermined phase difference due to the phase being changed by the phase variable unit
- a plurality of antennas that radiate a plurality of high-frequency powers to the object to be heated, a shape information acquisition unit that acquires shape information indicating the shape of the object to be heated, and the plurality of high-frequency powers in phase with each other in the first mode
- a control unit that controls the phase variable unit so that the plurality of high-frequency powers are in opposite phases in the second mode, and the control unit is the shape information acquisition unit. Based on the obtained shape information, switching between the first mode and the second mode.
- the distribution of the electromagnetic field intensity in the heating chamber has the same intensity in a direction parallel to the same plane where the plurality of antennas are arranged. It has such a spread and is vertically layered.
- a plurality of high-frequency powers radiated from a plurality of antennas are in reverse phase, they have a spread that has the same strength in the vertical direction with respect to the same plane on which the plurality of antennas are arranged, Stratify.
- the object to be heated is efficiently and uniformly heated when the distribution of the electromagnetic field intensity due to the standing wave in the heating chamber follows the shape of the object to be heated. Therefore, the object to be heated can be efficiently and uniformly heated by creating the distribution of the electromagnetic field intensity due to the standing wave in the heating chamber based on the shape information as described above.
- the predetermined phase difference is substantially 0 degree when the plurality of high-frequency powers are in phase, and the predetermined phase difference is substantially 180 degrees when the plurality of high-frequency powers are in reverse phase. It is preferable.
- the first mode and the second mode may be switched during heating so that the time length ratio is increased.
- the distribution of is spread so as to have the same intensity in the direction parallel to the same plane, and forms a layer in the vertical direction. Therefore, the distribution of the electromagnetic field intensity is surely suitable for the shape of the object to be heated, and the object to be heated can be reliably and efficiently heated.
- the control unit may be configured such that a ratio of a dimension of the heated object in a direction parallel to the same surface to a dimension of the heated object in a direction perpendicular to the same surface is equal to or greater than a first value greater than 1.
- the mode may be switched to the first mode, and when the second value is less than 1 or less, the mode may be switched to the second mode.
- the first mode and the second mode may be switched during heating so that the time length of one mode is substantially equal to the time length of the second mode.
- the object to be heated can be efficiently and uniformly heated.
- control unit based on the shape information acquired by the shape information acquisition unit, the size of the object to be heated in the direction parallel to the same surface with respect to the size of the heated object in the direction perpendicular to the same surface
- the ratio may be specified, and the first mode and the second mode may be switched based on the specified ratio.
- the same surface is a bottom surface or an upper surface of the heating chamber, and the control unit switches to the first mode when the object to be heated is food placed on a flat plate, and the object to be heated In the case where the thing is liquor in a coconut, the mode may be switched to the second mode.
- control unit may alternately repeat the first mode and the second mode.
- the surface to be heated is efficiently and uniformly heated in a direction parallel to the same surface where the plurality of antennas are arranged, and in the second mode, the object to be heated is perpendicular to the same surface.
- the direction surface is efficiently and uniformly heated. That is, the object to be heated is efficiently and uniformly heated as a whole through the first mode and the second mode.
- the shape information acquisition unit may be a sensor that detects the outer shape and dimensions of the object to be heated.
- This shape information is, for example, the size of the bottom area and height of the object to be heated.
- the shape information acquisition unit may be a shape selection button that accepts designation of the shape of the object to be heated by the user.
- the plurality of antennas may be planar antennas.
- This configuration makes it possible to mount the antenna small, thereby reducing the size of the device.
- the high-frequency heating device is a high-frequency heating device that heats an object to be heated housed in a heating chamber, the high-frequency power generation unit generating high-frequency power, and the high-frequency power generation A phase variable unit that changes the phase of the high-frequency power generated in the unit, and a plurality of high-frequency powers disposed on the same surface in the heating chamber and having a predetermined phase difference due to the phase being changed by the phase variable unit
- the phase variable unit is controlled such that the plurality of high-frequency powers are in phase with the plurality of antennas radiating to the object to be heated, and the plurality of high-frequency powers are in opposite phases in the second mode.
- a control unit that controls the phase variable unit, and the control unit alternately switches between the first mode and the second mode.
- This configuration eliminates the need for an infrared sensor or a shape selection button by a user operation. Further, since control based on the shape information of the object to be heated is not necessary, the cost can be reduced and the apparatus can be downsized. Further, by alternately switching between a first mode in which a plurality of high-frequency powers are in phase and a second mode in which the plurality of high-frequency powers are in opposite phases, the shape of the object to be heated and the arrangement of the object to be heated in the heating chamber Therefore, it is possible to realize uniform and stable heating at all times.
- the present invention can be realized not only as an apparatus but also as a high-frequency heating method using a processing unit constituting the apparatus as a step.
- the high-frequency heating device and the high-frequency heating method of the present invention can efficiently and uniformly heat the object to be heated according to the shape of the object to be heated.
- FIG. 1 is a block diagram showing a basic configuration of the high-frequency heating device according to Embodiment 1.
- FIG. 2 is a block diagram showing a specific configuration of the high-frequency power generation unit.
- FIG. 3 is a block diagram showing a specific configuration of a high-frequency power generation unit using a PLL.
- FIG. 4 is a flowchart showing the basic operation of the high-frequency heating device according to Embodiment 1.
- FIG. 5 is a flowchart showing a control procedure of the first operation of the high-frequency heating device according to the first embodiment.
- FIG. 6A is a perspective view schematically showing a configuration of a high-frequency heating device having an antenna center-to-center distance of 90 mm.
- FIG. 6B is a diagram showing a distribution of electromagnetic field intensity due to a standing wave in the heating chamber in the common-mode mode in the high-frequency heating apparatus having a 90 mm distance between the centers of the antennas.
- FIG. 7A is a perspective view schematically showing a configuration of a high-frequency heating device having an antenna center-to-center distance of 105 mm.
- FIG. 7B is a diagram showing a distribution of electromagnetic field strength due to a standing wave in the heating chamber in the common-mode mode in the high-frequency heating apparatus having an antenna center-to-center distance of 105 mm.
- FIG. 8A is a perspective view schematically showing a configuration of a high-frequency heating apparatus having an antenna center-to-center distance of 120 mm.
- FIG. 8B is a diagram showing a distribution of electromagnetic field strength due to a standing wave in the heating chamber in the common-mode mode in the high-frequency heating apparatus having an antenna center-to-center distance of 120 mm.
- FIG. 9A is a perspective view schematically showing a configuration of a high-frequency heating device in which the number of antennas is four and the center-to-center distance between adjacent antennas is 90 mm.
- FIG. 9B is a diagram showing a distribution of electromagnetic field strength due to standing waves in the heating chamber in the common-mode mode in a high-frequency heating apparatus in which the number of antennas is four and the center-to-center distance between adjacent antennas is 90 mm.
- FIG. 9A is a perspective view schematically showing a configuration of a high-frequency heating device in which the number of antennas is four and the center-to-center distance between adjacent antennas is 90 mm.
- FIG. 9B is a diagram showing a distribution of electromagnetic field strength due to standing waves in the heating chamber in the common-mode mode in
- FIG. 10 is a diagram showing a distribution of electromagnetic field strength due to a standing wave in the heating chamber in the reverse phase mode in the high-frequency heating apparatus with the center-to-center distance of 90 mm shown in FIG. 6A.
- FIG. 11 is a diagram showing a distribution of electromagnetic field strength due to a standing wave in the heating chamber in the reverse phase mode in the high-frequency heating apparatus having an antenna center-to-center distance of 105 mm shown in FIG. 7A.
- FIG. 12 is a diagram showing a distribution of electromagnetic field strength due to a standing wave in the heating chamber in the reverse phase mode in the high-frequency heating apparatus having an antenna center distance of 120 mm shown in FIG. 8A.
- FIG. 8A is a diagram showing a distribution of electromagnetic field strength due to a standing wave in the heating chamber in the reverse phase mode in the high-frequency heating apparatus with an antenna center distance of 120 mm shown in FIG. 8A.
- FIG. 13 shows the distribution of electromagnetic field intensity due to standing waves in the heating chamber in the reverse phase mode in the high frequency heating apparatus in which the number of antennas shown in FIG. 9A is four and the distance between the centers of adjacent antennas is 90 mm.
- FIG. 14A is a diagram schematically illustrating an example of a state where a flat object to be heated is stored in a heating chamber of a high-frequency heating device.
- FIG. 14B is a diagram schematically illustrating an example of a state in which a vertically long object to be heated is stored in a heating chamber of a high-frequency heating device.
- FIG. 15 is a flowchart illustrating a control procedure of the second operation of the high-frequency heating device according to the first embodiment.
- FIG. 16 is a diagram showing an example of a matrix for determining the heating execution times ta and tb from the shape information in the first embodiment.
- FIG. 17 is a block diagram illustrating a basic configuration of the high-frequency heating device according to the second embodiment.
- FIG. 18 is an external view of a high-frequency heating device having a shape selection button according to the second embodiment.
- FIG. 19 is a flowchart showing the basic operation of the high-frequency heating device according to the second embodiment.
- FIG. 20 is a block diagram illustrating a basic configuration of the high-frequency heating device according to the third embodiment.
- FIG. 21 is a flowchart showing the basic operation of the high-frequency heating device according to Embodiment 3.
- the high-frequency heating device is a high-frequency heating device that heats an object to be heated housed in a heating chamber, and includes a high-frequency power generation unit that generates high-frequency power, and the high-frequency power generation unit.
- a phase variable unit that changes the phase of the generated high-frequency power and a plurality of high-frequency powers disposed on the same surface in the heating chamber and having a predetermined phase difference due to the phase being changed by the phase variable unit.
- a plurality of antennas that radiate to the heated object, a shape information acquisition unit that acquires shape information indicating the shape of the object to be heated, and the phase variable unit that controls the phase variable unit so that the plurality of high-frequency powers are in phase in the first mode And a control unit that controls the phase variable unit so that the plurality of high-frequency powers have opposite phases in the second mode, and the control unit is based on the shape information acquired by the shape information acquisition unit. , Switching between the first mode and the second mode.
- the high-frequency heating device radiates high-frequency power from a plurality of antennas with an appropriate phase difference based on the shape information of the object to be heated acquired by the shape information acquisition unit. To do. Therefore, an electromagnetic field intensity distribution by standing waves suitable for the shape of the object to be heated can be formed in the heating chamber, and the object to be heated can be efficiently and uniformly heated according to the shape of the object to be heated.
- FIG. 1 is a block diagram showing a basic configuration of a high-frequency heating device 100 according to Embodiment 1 of the present invention.
- the to-be-heated object 150 heated by the high frequency heating apparatus 100 is also shown in the figure.
- the high-frequency heating device 100 includes a heating chamber 101, a distribution unit 102, a first phase variable unit 103a, a second phase variable unit 103b, a first antenna 104a, a second antenna 104b, and high-frequency power generation.
- Unit 110 shape information acquisition unit 120, and control unit 130.
- the high-frequency heating device 100 includes two antennas and two phase variable units, but the number of antennas and phase variable units is not limited thereto.
- the first phase variable unit 103a is referred to as a phase variable unit 103a
- the second phase variable unit 103b is referred to as a phase variable unit 103b
- the first antenna 104a is referred to as an antenna 104a
- the second antenna 104b is referred to as an antenna 104b.
- the heating chamber 101 is a housing that houses the article 150 to be heated, and is made of, for example, metal.
- the distribution unit 102 distributes the high frequency power generated by the high frequency power generation unit 110 into two.
- a Wilkinson distributor may be used, or any of a hybrid coupler and a resistor distributor may be used.
- the phase varying units 103a and 103b change the phase of the high-frequency power input via the distribution unit 102 to the set phase indicated by the control unit 130, respectively, and enter the heating chamber via the corresponding antennas 104a and 104b. Radiate. That is, the phase variable units 103a and 103b change the phase of the input high-frequency power, respectively, so that the two high-frequency powers radiated from the antennas 104a and 104b have a predetermined phase difference. Specifically, the phase variable units 103a and 103b change the phase of the high-frequency power according to the phase setting signals 105a and 105b indicating the set phase input from the control unit 130. For example, a bit step variable phase shifter or a continuous variable phase shifter can be used as the phase variable units 103a and 103b.
- a bit step variable phase shifter (for example, a 3 bit step variable phase shifter) is used in digital control, and controls the phase shift amount in several steps in a step combination by path switching.
- the amount of phase shift is determined based on phase setting signals 105a and 105b, which are control signals indicating the setting phase input from the outside.
- the continuously variable phase shifter is used for analog voltage control, and is known as a loaded line type phase shifter using a transmission line and a hybrid coupled type phase shifter using a 90 ° hybrid coupler, for example.
- a loaded line type phase shifter using a transmission line and a hybrid coupled type phase shifter using a 90 ° hybrid coupler, for example.
- the reflection phase at the two resonance circuits is changed, and the insertion phase shift between the input and output is changed.
- the amount of change in insertion phase shift is determined based on phase setting signals 105a and 105b, which are control signals indicating the setting phase input from the outside.
- the antennas 104a and 104b are provided in a one-to-one correspondence with the phase variable units 103a and 103b, respectively, and heat high-frequency power having a predetermined phase difference by changing the phase in the corresponding phase variable units 103a and 103b. Radiates into the chamber 101.
- the antennas 104 a and 104 b are provided on the bottom surface in the heating chamber 101. In FIG. 1, the antennas 104a and 104b are provided on the bottom surface of the heating chamber 101.
- the present invention is not limited to this, and all the antennas may be provided on the same surface. It may be provided on the back.
- the antennas 104a and 104b may be planar antennas such as a circular patch antenna and a rectangular patch antenna. As a result, the antennas 104a and 104b can be made thin and small, the degree of freedom in designing the device can be increased, and downsizing and cost reduction can be realized.
- the high frequency power generator 110 generates high frequency power having a predetermined frequency.
- the high frequency power generated by the high frequency power generation unit 110 is input to the phase variable units 103 a and 103 b via the distribution unit 102.
- a specific configuration of the high-frequency power generation unit 110 will be described later.
- the shape information acquisition unit 120 acquires shape information indicating the shape of the object 150 to be heated, and outputs a shape information signal 106 indicating the acquired shape information to the control unit 130.
- one or more shape information acquisition units 120 are provided inside the heating chamber 101 and detect the shape of the object to be heated 150 in a non-contact manner with respect to the object to be heated 150.
- Sensors and laser sensors An infrared sensor or a laser sensor can obtain shape information of an object by irradiating the object with infrared or laser light and detecting the reflected light.
- the technology of infrared sensors or laser sensors is well known, and many two-dimensional sensors and three-dimensional sensors have recently been introduced, including point sensors and line sensors.
- the control unit 130 controls the phase variable units 103a and 103b so that the high-frequency power radiated from the antenna 104a in the first mode and the high-frequency power radiated from the antenna 104b are in phase, and the antenna 104a in the second mode.
- the phase variable units 103a and 103b are controlled so that the high-frequency power radiated from the antenna and the high-frequency power radiated from the antenna 104b are in opposite phases.
- the phase difference between the high-frequency power radiated from the antenna 104a and the high-frequency power radiated from the antenna 104b is 0 degrees
- the opposite phase is the high-frequency power radiated from the antenna 104a and the antenna 104b.
- the phase difference from the radiated high frequency power is 180 degrees.
- control unit 130 is connected to the first phase variable unit 103a and the second phase variable unit 103b via control lines, respectively, and the phase of the high-frequency power radiated from the antennas 104a and 104b, respectively. Control. More specifically, the control unit 130 outputs phase setting signals 105a and 105b instructing the respective setting phases to the first phase variable unit 103a and the second phase variable unit 103b. As a result, the control unit 130 causes the phase variable units 103a and 103b to set the phase difference between the high frequency power radiated from the antenna 104a and the high frequency power radiated from the antenna 104b in the first mode to 0 degrees. In the mode, the phase difference is set to 180 degrees.
- a state in which the set phases of the phase variable units 103a and 103b are set so that the phase difference between the high frequency powers radiated from the antennas 104a and 104b is 0 degrees is referred to as a common mode.
- a state in which the set phases of the phase variable units 103a and 103b are set so that the phase difference between the high-frequency powers radiated from the antennas 104a and 104b is 180 degrees is referred to as a reverse phase mode. That is, the first mode is a period in which the in-phase mode is set, and the second mode is a period in which the anti-phase mode is set.
- control unit 130 is heated based on the shape information acquired by the shape information acquisition unit 120 in a direction parallel to the dimension of the heated object 150 in the direction perpendicular to the surface on which the antennas 104a and 104b are arranged.
- the ratio of the dimensions of the object 150 is specified, and the first mode and the second mode are switched based on the specified ratio.
- the control unit 130 corresponds to the dimension of the object 150 to be heated projected on any side surface of the heating chamber 101.
- the ratio of the dimensions of the object to be heated 150 projected onto the bottom surface of the heating chamber 101 may be specified, and the period of the in-phase mode and the period of the reverse-phase mode may be determined based on the specified ratio.
- control unit 130 specifies and specifies the ratio of the dimension in which the object to be heated 150 is projected onto the bottom surface of the heating chamber 101 to the dimension in which the object to be heated 150 is projected on any side surface of the heating chamber 101. Based on the ratio, the in-phase mode period and the anti-phase mode period are determined. Further, during the in-phase mode period, the phase variable units 103a and 103b are controlled so that the phase difference between the high-frequency power radiated from the antenna 104a and the high-frequency power radiated from the antenna 104b becomes 0 degrees, and the anti-phase mode The phase variable sections 103a and 103b are controlled so that the phase difference becomes 180 degrees during the period.
- FIG. 2 is a block diagram showing a specific configuration of the high-frequency power generation unit 110.
- the high frequency power generation unit 110 shown in the figure includes an oscillation unit 111 and an amplification unit 112.
- the oscillation unit 111 is a general high-frequency oscillation circuit including a semiconductor amplification element such as a transistor and a resonance circuit such as a tank circuit.
- the configuration of the oscillation unit 111 is known, and a Hartley oscillation circuit, a Colpitts oscillation circuit, or the like can be used.
- the amplification unit 112 is, for example, a transistor that amplifies the high frequency power generated by the oscillation unit 111.
- the high-frequency power generation unit 110 may be configured as a variable-frequency high-frequency power generation unit using a phase locked loop (PLL: Phase Locked Loop).
- PLL Phase Locked Loop
- FIG. 3 is a block diagram showing a specific configuration of the high-frequency power generation unit 110 using a PLL.
- the high frequency power generation unit 110 shown in the figure includes an oscillation unit 113, a phase locked loop 114, and an amplification unit 112.
- the oscillation unit 113 is, for example, a VCO (Voltage Controlled Oscillator) that generates a high-frequency signal having a frequency corresponding to the voltage output from the phase-locked loop 114.
- VCO Voltage Controlled Oscillator
- the phase-locked loop 114 adjusts the output voltage so that the frequency of the high-frequency power generated from the oscillation unit 113 and the frequency control signal 115 indicating the set frequency input from the control unit 130 are the same frequency.
- the amplifying unit 112 is, for example, a transistor that amplifies the high frequency power generated by the oscillating unit 113.
- the high-frequency power generation unit 110 generates the high-frequency power having a predetermined frequency by having the configuration shown in FIGS. 2 and 3. 2 and 3, the amplifying unit 112 is shown as a single power amplifier. However, in order to obtain a high output and a large output power, a plurality of power amplifiers are provided, and a multistage series connection or a parallel connection is provided. You may combine and comprise.
- the in-phase mode and the reverse-phase mode are switched based on the shape information acquired by the shape information acquisition unit 120.
- the shape information indicates the ratio of the dimension of the object to be heated 150 in the direction parallel to the bottom surface to the dimension of the object to be heated 150 in the direction perpendicular to the bottom surface.
- FIG. 4 is a flowchart showing the basic operation of the high-frequency heating device 100.
- the shape information acquisition unit 120 acquires the shape information of the object to be heated 150 (step S101).
- the shape information acquisition unit 120 is, for example, an infrared laser or a laser sensor, and acquires the shape information of the object 150 to be heated.
- the shape information acquisition unit 120 outputs a shape information signal 106 that is a signal indicating the acquired shape information to the control unit 130.
- the control unit 130 specifies the aspect ratio when the heated object 150 is viewed from the side (step S102).
- the aspect ratio is the ratio of the horizontal dimension to the vertical dimension of the article 150 to be heated. That is, the control unit 130 specifies the ratio of the dimension of the heated object 150 in the direction parallel to the surface to the dimension of the heated object 150 in the direction perpendicular to the surface on which the antennas 104a and 104b are arranged.
- the control unit 130 for example, in a projection view in which the object to be heated 150 is projected on one of the side surfaces, between two points whose distance is the longest in the direction parallel to the bottom surface. Distance.
- the vertical dimension of the object to be heated 150 is, for example, the distance between two points that are the farthest in the vertical direction from the bottom surface in the projection view in which the object to be heated is projected on any side surface. Note that the maximum height of the cross-sectional views in the direction perpendicular to the bottom surface of the object to be heated 150 may be used.
- control unit 130 determines the time length for the in-phase mode and the time length for the reverse-phase mode according to the aspect ratio specified in the process (step S102) for specifying the aspect ratio of the article 150 to be heated (step S102). Step S103).
- control unit 130 heats the article 150 to be heated by setting the in-phase mode and the reverse-phase mode with the determined time lengths (step S104).
- the high-frequency heating device 100 is a high-frequency heating device that heats the article to be heated 150 housed in the heating chamber 101, and includes a high-frequency power generation unit 110 that generates high-frequency power,
- the phase variable units 103a and 103b that change the phase of the high frequency power generated by the high frequency power generation unit 110 and the phase variable units 103a and 103b are arranged on the same surface in the heating chamber 101, and the phase is changed by the phase variable units 103a and 103b.
- the phase variable sections 103a and 103b are controlled so that the high-frequency powers of the second phase are in phase, and in the second mode, the plurality of high-frequency powers are in reverse phase.
- the high-frequency heating apparatus 100 is parallel to the same plane with respect to the dimension of the object to be heated 150 in the direction perpendicular to the same plane where the plurality of antennas 104a and 104b are arranged based on the shape information.
- a ratio of dimensions of the object to be heated 150 is specified, and a plurality of high-frequency powers are set to be in phase or reverse phase based on the specified ratio.
- the distribution of the electromagnetic field intensity in the heating chamber 101 spreads so as to have the same intensity in the direction parallel to the same plane on which the plurality of antennas 104a and 104b are arranged. And is vertically layered.
- the object to be heated 150 is efficiently and uniformly heated when the distribution of electromagnetic field intensity due to standing waves in the heating chamber 101 follows the shape of the object to be heated 150. Therefore, the ratio of the dimension of the object to be heated 150 in the direction parallel to the dimension of the object to be heated 150 in the direction perpendicular to the same plane on which the plurality of antennas 104a and 104b are arranged as described above is specified and specified. By creating a distribution of electromagnetic field intensity due to standing waves in the heating chamber 101 according to the ratio, the object to be heated 150 can be efficiently and uniformly heated.
- the control unit 130 when the aspect ratio of the object 150 to be heated specified by the control unit 130 is equal to or greater than a first value greater than 1, the plurality of high-frequency powers radiated from the antennas 104a and 104b are in phase and less than 1.
- a plurality of high-frequency powers radiated from the antennas 104a and 104b are set in reverse phases. That is, radiation is performed in the in-phase mode when the aspect ratio of the object to be heated 150 is greater than or equal to the first value, and radiation in the opposite phase mode when less than or equal to the second value.
- the aspect ratio is larger than the second value and smaller than the first value, the radiation in the in-phase mode and the radiation in the anti-phase mode are alternately repeated.
- FIG. 5 is a flowchart showing a control procedure of the first operation of the high-frequency heating device 100 of FIG.
- the high frequency heating apparatus 100 of FIG. 1 performs the following process in the control unit 130.
- step S400 when the object to be heated 150 is stored in the heating chamber 101 and the user gives an instruction to start the heat treatment (step S400), first, the control unit 130 operates the shape information acquisition unit 120 to heat the object to be heated.
- the shape information of the object 150 is acquired (step S401).
- step S401 which acquires the shape information of this to-be-heated object 150 is corresponded to the process (step S101) which acquires the shape information of the to-be-heated object 150 shown in FIG.
- the shape of the article to be heated 150 is determined based on the shape information signal 106 input from the shape information acquisition unit 120 (step S402). Specifically, by specifying the aspect ratio of the object to be heated 150, the shape of the object to be heated 150 is flat (shape 1), vertically long (shape 2), or cubic (shape 3). Is determined.
- the control unit 130 determines that the shape is flat when the specified ratio is 3 or more, determines that the specified ratio is vertically long when the specified ratio is 0.3 or less, and the specified ratio is greater than 0.3 and less than 3 In the case of, it is determined as a cubic shape.
- the threshold for determining the shape of the object 150 to be heated by the control unit 130 is not limited to this, and is determined to be a flat shape when the specified ratio is 2 or more, and is vertically long when the specified ratio is 0.5 or less. If the specified ratio is greater than 0.5 and less than 2, it may be determined as a cubic shape. Note that the process of determining the shape of the object to be heated 150 (step S402) corresponds to the process of acquiring the aspect ratio of the object to be heated 150 shown in FIG. 4 (step S102).
- the shape of the object to be heated 150 determined based on the shape information signal 106 is a flat (landscape) shape (shape 1 in step S402)
- the phase difference between the high-frequency powers radiated from the antennas 104a and 104b, respectively. are set to the in-phase mode
- the phases of the phase variable sections 103a and 103b are set (step S403), and the heating process is executed (step S405).
- the execution of the heat treatment is specifically to radiate high-frequency power from the antennas 104a and 104b in the in-phase mode. Thereby, the article 150 to be heated is heated.
- the processing of the time length of the in-phase mode and the time length of the reverse-phase mode in FIG. corresponds to the case where the time length of the reverse phase mode is determined to be 0 in the determining process (step S103).
- the control unit 130 determines whether or not the heating of the article to be heated 150 is completed (step S406). If the heating is not completed (No in step S406), the control unit 130 continues to perform the heating process (step S406). S405). On the other hand, when the heating is completed (Yes in step S406), the process is terminated (step S412). For example, the control unit 130 measures the temperature of the object to be heated 150 in a non-contact manner using a temperature sensor, and the heating is completed when the temperature exceeds a predetermined temperature (for example, 80 degrees). judge. In addition, for example, when the heating time set in advance by the user is acquired and the elapsed time from the start of the heating process reaches the heating time set in advance by the user, the heating of the article to be heated 150 is completed. You may determine that you did.
- a predetermined temperature for example 80 degrees
- the high-frequency heating device 100 always sets the phase difference of the high-frequency power radiated from the antennas 104a and 104b to the in-phase mode when the shape of the object to be heated 150 is flat.
- the time during which the phase difference of the high-frequency power radiated from the antennas 104a and 104b is set to the anti-phase mode is set to zero.
- FIGS. 6A to 9B the distribution of the electromagnetic field intensity due to the standing wave in the heating chamber 101 when the phase difference between the high-frequency powers radiated from the antennas 104a and 104b is the in-phase mode.
- FIGS. 6A to 9B the distribution of the electromagnetic field intensity due to the standing wave in the heating chamber 101 in the in-phase mode will be described with reference to FIGS. 6A to 9B. 6A and 6B, FIGS. 7A and 7B, FIGS. 8B and 8B, and FIGS. 9A and 9B differ in the distance between the antennas 104a and 104b or the number of antennas. Note that these are only the antenna interval and the number of antennas, and the size of the heating chamber 101 and the frequency of the high frequency power radiated from the antenna are the same.
- FIG. 6A is a perspective view schematically showing the configuration of the high-frequency heating device 100 in which the distance between the centers of the antennas is 90 mm.
- the two antennas 104a and 104b configured by circular patches having a diameter of 64.6 mm are spaced from each other at a center distance of 90 mm on the same surface of the bottom surface of the heating chamber 101.
- the width (y dimension) of the heating chamber 101 is 410 mm
- the depth (x dimension) is 314 mm
- the height (z dimension) is 230 mm
- the frequency of the high frequency power radiated from the antennas 104a and 104b is 2450 MHz.
- FIG. 6B is a diagram showing an electromagnetic field intensity distribution due to a standing wave in the heating chamber 101 when high-frequency power is radiated in the common mode in the high-frequency heating apparatus 100 shown in FIG. 6A. Specifically, it is a diagram showing a simulation result of the distribution of the electromagnetic field intensity in the heating chamber 101 when it is assumed that high-frequency power having a frequency of 2450 MHz is radiated from the antennas 104a and 104b. Indicates that it has occurred. A portion where the electromagnetic field is strong is a portion corresponding to the antinode of the standing wave, and a portion where the electromagnetic field is weak is a portion corresponding to the node of the standing wave.
- FIG. 6B (a) shows the distribution of the electromagnetic field intensity due to the standing wave on the vertical plane (yz plane).
- the distribution of electromagnetic field intensity due to the standing wave on the vertical plane (yz plane) at the positions of 156 mm, 206 mm, and 286 mm is shown.
- the distribution of electromagnetic field intensity due to standing waves on the horizontal plane (xy plane) at positions of 75 mm, 105 mm, 135 mm, and 165 mm is shown.
- FIG. 7A is a perspective view schematically showing the configuration of the high-frequency heating device 100 having an antenna center-to-center distance of 105 mm.
- FIG. 7B is a diagram showing a distribution of electromagnetic field intensity due to standing waves in the heating chamber 101 in the in-phase mode in the high-frequency heating device 100 shown in FIG. 7A.
- FIG. 8A is a perspective view schematically showing the configuration of the high-frequency heating device 100 having an antenna center-to-center distance of 120 mm.
- FIG. 8B is a diagram showing a distribution of electromagnetic field intensity due to standing waves in the heating chamber 101 in the in-phase mode in the high-frequency heating device 100 shown in FIG. 8A.
- FIG. 9A is a perspective view schematically showing the configuration of the high-frequency heating device 100 in which the number of antennas is four and the distance between centers of adjacent antennas is 90 mm.
- the phase of the high-frequency power radiated from all antennas is the same phase in the in-phase mode.
- FIG. 9B is a diagram showing a distribution of electromagnetic field intensity due to standing waves in the heating chamber 101 in the in-phase mode in the high-frequency heating device 100 shown in FIG. 9A.
- FIG. 7B, FIG. 8B, and FIG. 9B are distributions of electromagnetic field intensity due to standing waves on the same plane as in FIG. 6B, respectively (a) and (b). is there.
- the distribution of the electromagnetic field intensity by the standing wave in the heating chamber 101 spreads in the horizontal direction and forms a layer in the vertical direction. I can see it.
- the distribution of the electromagnetic field intensity due to the standing wave in the heating chamber 101 is provided with the antennas 104a and 104b. It can be said that it has a horizontal spread and a vertical layer to the surface. That is, a portion where the electromagnetic field strength is strong and a portion where the electromagnetic field strength is weak spread in the horizontal direction and form a layer in the vertical direction. This is because the phases of the high-frequency powers radiated from the respective antennas 104a and 104b are in-phase, so that the high-frequency powers radiated from the respective antennas 104a and 104b are mutually intensified.
- the distribution of the electromagnetic field intensity due to the standing wave in the common mode is suitable for heating a flat object to be heated. .
- this will be described in detail.
- the high frequency power radiated from the antenna is heated.
- the direct incidence ratio may be dominant under conditions in which conditions such as the shape of the object to be heated and the placement location are very limited, but in most cases, the ratio of sneak incidence is dominant.
- the magnitude of the absorption of high-frequency power into the object to be heated due to the sneak incidence changes depending on the strength of the electromagnetic field strength due to the standing wave formed in the heating chamber, and the absorption increases from the portion where the electromagnetic field strength is strong. Absorption decreases from the portion where the electromagnetic field strength is weak. From this, by forming the distribution of the electromagnetic field intensity according to the shape of the object to be heated, it is possible to make the absorption of the high-frequency power to the object to be heated due to the sneak incidence uniform.
- the phase variable unit is set so that the phase difference between the high-frequency powers radiated from the antennas 104a and 104b becomes the common mode.
- the heating process is executed by setting the phases 103a and 103b.
- the distribution of the electromagnetic field intensity due to the standing wave in the heating chamber 101 is in a state of spreading in the horizontal direction and forming a layer in the vertical direction according to the shape of the heated object 150. 150 can be heated efficiently and uniformly.
- the control unit 130 determines the high-frequency power radiated from the antennas 104a and 104b, respectively.
- the phases of the phase variable sections 103a and 103b are set so that the phase difference is in the reverse phase mode (step S404).
- the processing is performed using the time length of the in-phase mode and the time length of the reverse phase mode in FIG. This corresponds to the case where the time length of the common mode is determined to be 0 in the determination process (step S103).
- step S405 a heating process is executed (step S405), and when the heating is completed (Yes in step S406).
- the process is terminated (step S412).
- step S404 the execution of the heating process (step S405) after setting the phases of the phase variable sections 103a and 103b (step S404) so that the phase difference is in the anti-phase mode is performed by the high frequency power radiated from the antennas 104a and 104b.
- the phase difference is in reverse phase mode.
- the high-frequency heating device 100 sets the phase difference of the high-frequency power radiated from the antennas 104a and 104b to the reverse phase mode when the shape of the object to be heated 150 is vertically long.
- the time during which the phase difference between the high frequency powers radiated from the antennas 104a and 104b is set to the common mode is set to zero.
- FIGS. 10 to 13 (a) and (b) is a distribution of electromagnetic field intensity by standing waves on a plane at the same position as each of (a) and (b) of FIG. 6B.
- FIG. 10 shows the distribution of electromagnetic field strength due to standing waves in the heating chamber 101 when high-frequency power is radiated in the reverse phase mode in the high-frequency heating apparatus with the center-to-center distance of 90 mm shown in FIG. 6A.
- FIG. 10 shows the distribution of electromagnetic field strength due to standing waves in the heating chamber 101 when high-frequency power is radiated in the reverse phase mode in the high-frequency heating apparatus with the center-to-center distance of 90 mm shown in FIG. 6A.
- FIG. 11 is a diagram showing a distribution of electromagnetic field strength due to standing waves in the heating chamber 101 in the reverse phase mode in the high-frequency heating apparatus having the antenna center distance of 105 mm shown in FIG. 7A.
- FIG. 12 is a diagram showing the distribution of the electromagnetic field intensity due to the standing wave in the heating chamber 101 in the reverse phase mode in the high-frequency heating apparatus having the antenna center distance of 120 mm shown in FIG. 8A.
- FIG. 13 shows the electromagnetic field strength due to standing waves in the heating chamber 101 in the reverse phase mode in a high-frequency heating apparatus in which the number of antennas shown in FIG. 9A is four and the center-to-center distance between adjacent antennas is 90 mm. It is a figure which shows distribution.
- the distribution of the electromagnetic field intensity due to the standing wave in the heating chamber 101 has a cylindrical expansion in the vertical direction and is arranged in the horizontal direction.
- a distribution of electromagnetic field strength along the shape of the object to be heated may be formed. Therefore, the distribution of the electromagnetic field intensity due to the standing wave that spreads in the vertical direction when high-frequency power is radiated from the antenna in the reverse phase mode is suitable for heating a vertically long object to be heated.
- the phase difference is set so that the phase difference between the high-frequency powers radiated from the antennas 104a and 104b becomes the anti-phase mode.
- the phase of the variable parts 103a and 103b is set and the heat treatment is executed.
- the distribution of the electromagnetic field intensity due to the standing wave in the heating chamber 101 is in a state of having a cylindrical extension in the vertical direction and aligned in the horizontal direction in accordance with the shape of the object to be heated 150. Can be efficiently and uniformly heated.
- the control unit 130 determines the high-frequency power radiated from the antennas 104a and 104b, respectively.
- the phases of the phase variable sections 103a and 103b are set so that the phase difference is in the in-phase mode (step S407).
- the shape of the object 150 to be heated determined based on the shape information signal 106 is a cubic shape (shape 3 in step 402)
- ta 1 sec
- the phases of the phase variable units 103a and 103b are set so that the phase difference between the high-frequency powers radiated from the antennas 104a and 104b is set to the anti-phase mode (step S409). .
- tb 1 sec
- step S402 As in the case where the shape of the object 150 to be heated is flat (shape 1 in step S402) and the shape of the object 150 is vertically long (shape 2 in step S402), heating is performed. It is determined whether or not has been completed (step S411). Note that steps S403 to S411 correspond to the process (step S104) for heating the article 150 to be heated shown in FIG.
- step S411 When the heating is not completed (No in step S411), the execution of the heating process in the in-phase mode and the execution of the heating process in the reverse phase mode are repeated at predetermined intervals ta and tb (steps S407 to S411). . On the other hand, when the heating is completed (Yes in step S411), the process ends (step S412).
- the high-frequency heating device 100 determines the phase difference of the high-frequency power radiated from the antennas 104a and 104b at a predetermined time interval when the shape of the object to be heated 150 is a cubic shape.
- the heat treatment is executed by alternately switching between the in-phase mode and the reverse-phase mode.
- the aspect ratio of the specified object 150 to be heated is larger than the second value and smaller than the first value
- the phase difference of the high-frequency power radiated from the antennas 104a and 104b is reversed from the in-phase mode. Repeat alternately with mode.
- the distribution of the electromagnetic field intensity due to the standing wave in the heating chamber 101 has a state in which the horizontal direction spreads and forms a layer in the vertical direction, and a columnar spread in the vertical direction and aligns in the horizontal direction. Are alternately formed. Therefore, when the object to be heated 150 has a cubic shape, high-frequency power due to sneak incidence is uniformly absorbed by the entire object to be heated 150, and the object to be heated 150 can be efficiently and uniformly heated.
- the high-frequency heating device 100 radiates from the antennas 104a and 104b when the specified ratio is greater than or equal to the first value greater than 1 by the first operation.
- the phase difference of the high-frequency power is set to the in-phase mode and the specified ratio is less than or equal to the second value less than 1
- the phase difference of the high-frequency power radiated from the antennas 104a and 104b is set to the anti-phase mode.
- the specified ratio is greater than the second value and less than the first value
- the phase difference of the high frequency power radiated from the antennas 104a and 104b is alternately repeated in the in-phase mode and the anti-phase mode. .
- the object to be heated 150 has a relatively flat (horizontally long) shape such as food on a flat plate or steak meat wrapped in wrap as shown in FIG. 14A
- the antennas 104a and 104b The phase difference of the radiated high frequency power is heated in the common mode.
- FIG. 14B in the case of a relatively vertically long shape such as a cup or an insulator, the phase difference of the high-frequency power radiated from the antennas 104a and 104b is heated as a reverse phase mode.
- the surface on which the antennas 104a and 104b are arranged is the bottom surface or the top surface in the heating chamber 101, and the control unit 130 determines that the antennas 104a and 104b are to be heated when the heated object 150 is food on a flat plate.
- the time during which the phase difference of the high-frequency power radiated from the negative phase mode is set to zero.
- the time during which the phase difference of the high-frequency power radiated from the antennas 104a and 104b is set to the common mode is set to zero.
- the phase difference of the high-frequency power radiated from the antennas 104a and 104b is set to the in-phase mode and the anti-phase mode. And alternately.
- the heat treatment can be executed in a state where an appropriate electromagnetic field intensity distribution is generated according to the shape of the object to be heated 150, the object to be heated can be efficiently and uniformly heated.
- the shape of the object to be heated 150 is a cubic shape (shape 3 in step S402)
- the time ta for performing the heat treatment in the in-phase mode and the time tb for performing the heat treatment in the reverse-phase mode are set.
- the object to be heated is a relatively flat shape such as mainly food on a plate.
- the distribution of the electromagnetic field intensity in the heating chamber 101 spreads so as to have the same intensity in the parallel direction with respect to the surface on which the antennas 104a and 104b are arranged, and forms a layer in the vertical direction. Therefore, an electromagnetic field intensity distribution that is surely suitable for the shape of the object to be heated 150 is generated, and the object to be heated 150 can be reliably and efficiently heated.
- the control for alternately switching between the in-phase mode and the reverse-phase mode is shown.
- it may be fixed to either the in-phase mode or the reverse-phase mode. Thereby, heating by simpler control can be performed.
- this operation is performed by heating the object 150 in a flat shape for a longer period of time than the reverse phase mode, and when the object to be heated 150 is in a vertically long mode.
- the heating is performed with a longer phase in the reverse phase mode and the object 150 to be heated has a cubic shape, the heating is performed with the time in the in-phase mode and the reverse phase mode being equal.
- this operation is a period in which the high-frequency power radiated from the antenna 104a and the high-frequency power radiated from the antenna 104b are in phase when the aspect ratio of the heated object 150 specified by the control unit 130 is 1. And heating is performed with an equal period of reverse phase.
- heating is performed with a period in which the high-frequency power radiated from the antenna 104a and the high-frequency power radiated from the antenna 104b are in phase longer than the period in the opposite phase.
- the aspect ratio is smaller than 1, heating is performed with a period in which the high-frequency power radiated from the antenna 104a and the high-frequency power radiated from the antenna 104b are in phase shorter than the period in the opposite phase.
- FIG. 15 is a flowchart showing a control procedure of the second operation of the high-frequency heating device 100 of FIG.
- the high frequency heating apparatus 100 of FIG. 1 performs the following process in the control unit 130.
- step S700 when the object to be heated 150 is stored in the heating chamber 101 and the user gives an instruction to start the heat treatment (step S700), first, the control unit 130 operates the shape information acquisition unit 120 to operate the object to be heated. 150 shape information is acquired (step S701). In this step S701, the shape information of the object to be heated 150 is obtained by operating the process (step S101) for obtaining the shape information of the object 150 to be heated shown in FIG. 4 and the shape information acquisition unit 120 shown in FIG. This corresponds to the process to acquire (step S401).
- the shape of the object to be heated 150 is determined based on the shape information signal 106 input from the shape information acquisition unit 120 (step S702). Specifically, by specifying the aspect ratio of the object to be heated 150, the shape of the object to be heated 150 is flat (shape 1), vertically long (shape 2), or cubic (shape 3). Is determined. For example, a cube shape (shape 3) is determined when the specified ratio is 1, a flat shape (shape 1) is determined when the specified ratio is greater than 1, and a vertically long shape when the specified ratio is less than 1. Judge as (shape 2). The specified ratio may be substantially 1, preferably in the range of 0.8 to 1.2, and in the range of 0.7 to 1.5. Further, the process for determining the shape of the object to be heated 150 (step S702) corresponds to the process for acquiring the aspect ratio of the object to be heated 150 shown in FIG. 4 (step S102).
- the phase ta is opposite to the time ta for performing the heat treatment in the in-phase mode.
- the heat treatment is performed in the reverse phase mode with the time ta for performing the heat treatment in the in-phase mode.
- the shape of the object 150 to be heated determined based on the shape information signal 106 is a substantially cubic shape (shape 3 in step S702), the time ta for performing the heat treatment in the in-phase mode and the anti-phase mode are used.
- the processing for setting the values of ta and tb (steps S703 to S705) is another example of the processing for determining the time length of the in-phase mode and the time length of the anti-phase mode (step S103) shown in FIG. is there. Specifically, when the shape of the object to be heated 150 is determined based on the shape information signal 106 and the time length of the in-phase mode is determined to be ta and the time length of the reverse-phase mode is determined to be tb according to the determined location. Equivalent to.
- the phases of the phase variable sections 103a and 103b are set so that the phase difference between the high-frequency powers radiated from the antennas 104a and 104b is in the in-phase mode (step S706).
- the heating process is executed until the time ta set in the process of setting the values of ta and tb (steps S703 to S705) has elapsed (step S707).
- the phases of the phase variable sections 103a and 103b are set so that the phase difference between the high-frequency powers radiated from the antennas 104a and 104b is in the reverse phase mode (step S708).
- step S710 The process of repeating the switching between the in-phase mode and the reverse-phase mode (steps S706 to S710) until the heating is completed (Yes in step S710) is a process of heating the article 150 to be heated shown in FIG. 4 (step S104). It corresponds to.
- step S710 When the heating is not completed (No in step S710), the execution of the heating process in the in-phase mode and the execution of the heating process in the reverse phase mode are repeated at predetermined time intervals ta and tb (steps S706 to S710). . On the other hand, when the heating is completed (Yes in step S710), the process ends (step S711).
- the high-frequency heating device 100 heats the object 150 to be heated by increasing the time of the in-phase mode from the opposite-phase mode when the object to be heated 150 is a flat shape by the second operation described above.
- the object to be heated 150 is vertically long, heating is performed with the time of the reverse phase mode longer than that of the in-phase mode, and when the object to be heated 150 is cubic, heating is performed with the time of the in-phase mode and the reverse phase mode being equal. .
- the phase difference of the high-frequency power radiated from the antennas 104a and 104b is changed by changing the ratio of the time for radiating in the in-phase mode and the time for radiating in the anti-phase mode,
- the heat treatment is executed by switching alternately.
- the heat treatment in a state where the distribution of the electromagnetic field intensity spreads in the horizontal direction and forms a layer in the vertical direction.
- the time ta is longer than the heat treatment time tb in a state where the distribution of the electromagnetic field intensity has a cylindrical expansion in the vertical direction and is arranged in the horizontal direction.
- the distribution of the electromagnetic field strength is the distribution of the electromagnetic field strength due to the standing wave in the heating chamber 101. Therefore, since the horizontal uniform heating is focused on and the vertical uniform heating is also performed at the same time, the high frequency power due to the sneak incident is uniformly absorbed by the entire heated object 150, and the heated object 150 is heated efficiently and uniformly. can do.
- the heat treatment time tb in a state where the distribution of the electromagnetic field intensity has a columnar spread in the vertical direction and is arranged in the horizontal direction is the electromagnetic field intensity.
- the distribution becomes longer than the heat treatment time ta in a state where the distribution is spread in the horizontal direction and the layers are formed in the vertical direction. Therefore, the uniform heating in the vertical direction is focused on, and the uniform heating in the horizontal direction is also performed at the same time, so that the high frequency power due to the sneak incidence is uniformly absorbed by the entire object to be heated 150, and the object to be heated 150 is efficiently and uniformly heated. can do.
- the heat treatment time tb in a state where the distribution of the electromagnetic field intensity has a cylindrical expansion in the vertical direction and is arranged in the horizontal direction is the electromagnetic field intensity.
- the heat treatment time ta in a state in which the distribution of is spread in the horizontal direction and is layered in the vertical direction is the same as the heat treatment time ta in a state in which the distribution of is spread in the horizontal direction and is layered in the vertical direction. Since the time ta and the time tb are repeated at the same time, the uniform heating in the horizontal direction and the vertical direction is repeated at the same ratio. Therefore, the high frequency power by the sneak incidence is uniformly absorbed by the entire object to be heated, and the object to be heated can be efficiently and uniformly heated.
- the high-frequency heating device 100 controls the set phases of the phase variable units 103a and 103b based on the shape information of the object 150 to be heated acquired by the shape information acquisition unit 120, The phase difference of the high frequency electric power radiated
- heat processing can be performed in a state where an appropriate electromagnetic field intensity distribution is generated according to the shape of the object to be heated 150, the object to be heated 150 can be efficiently and uniformly heated.
- the shape of the object to be heated 150 is determined to be any one of a flat shape (shape 1), a vertically long shape (shape 2), and a cubic shape (shape 3). It is not limited, and the number of judgments may be increased such as a slightly flat shape or a slightly vertically long shape, and it is determined steplessly between a flat shape and a vertically long shape, and is opposite to the heating time ta in the above-mentioned common mode. You may make it set the ratio of the value with time tb overheating in phase mode.
- the time ta radiating in the in-phase mode and the time tb radiating in the reverse-phase mode are determined in advance according to the aspect ratio of the object 150 to be heated.
- the ratio of the time tb radiating in the in-phase mode to the time ta radiating in the reverse-phase mode may be increased as the aspect ratio of the article 150 to be heated is larger.
- the values of ta and tb corresponding to are previously determined in a matrix and stored in a memory or the like, and the ratio (Lh / Lv) between the average dimension (Lh) in the parallel direction and the average dimension (Lv) in the vertical direction
- the values of ta and tb corresponding to) may be read from the memory.
- FIG. 16 is a diagram illustrating an example of a matrix in which the values of ta and tb corresponding to the ratio (Lh / Lv) between the horizontal average dimension (Lh) and the vertical dimension (Lv) are defined.
- the ratio (Lh / Lv) between the horizontal average dimension (Lh) and the vertical dimension (Lv) is 2, that is, the horizontal average dimension is twice the vertical dimension.
- ta is 2 sec and tb is 1 sec from the matrix shown in FIG.
- the in-phase mode radiation is performed first, but the anti-phase mode radiation is performed first. It doesn't matter.
- the phase difference of the high-frequency power radiated from the antennas 104a and 104b may be substantially 0 degrees, preferably in the range of ⁇ 5 degrees to +5 degrees, ⁇ 10 A range of degrees to +10 degrees is also acceptable.
- the phase difference of the high-frequency power radiated from the antennas 104a and 104b may be substantially 180 degrees, and is preferably in the range of 175 degrees to 185 degrees, and 170 degrees A range of ⁇ 190 degrees is also acceptable.
- the ratio of the dimension of the object to be heated 150 in the direction parallel to the surface to the dimension of the object to be heated 150 in the direction perpendicular to the surface on which the antennas 104a and 104b are arranged is specified.
- the dimension of the object to be heated 150 in a different direction is compared with the dimension of the object to be heated 150 in a parallel direction, and depending on the comparison result, whether to emit in the in-phase mode or in the opposite phase mode is determined. Also good. Specifically, when the dimension of the object to be heated 150 in the vertical direction is smaller than the dimension of the object to be heated 150 in the parallel direction, it may be determined that the shape is horizontally long and radiate in the in-phase mode.
- the shape is a vertically long shape and may be emitted in the reverse phase mode.
- the dimension of the object to be heated 150 in the vertical direction is substantially equal to the dimension of the object to be heated 150 in the parallel direction, it is determined as a cubic shape, and the in-phase mode and the reverse-phase mode are alternately emitted. Good.
- the high-frequency heating device is different from the high-frequency heating device 100 according to the first embodiment in that the shape information of the object to be heated is acquired by a user operation. That is, the high-frequency heating device 100 according to Embodiment 1 does not require an operation by a user, and acquires shape information of an object to be heated using, for example, an infrared sensor or a laser sensor. On the other hand, the high-frequency heating device according to the present embodiment does not require a two-dimensional sensor or a three-dimensional sensor such as an infrared sensor or a laser sensor, and acquires shape information of an object to be heated by a user operation.
- FIG. 17 is a block diagram showing a basic configuration of the high-frequency heating device according to Embodiment 2 of the present invention.
- the high-frequency heating apparatus 200 shown in the figure is different from the high-frequency heating apparatus 100 shown in FIG. 1 in that the shape information acquisition unit 220 acquires the shape information of the object to be heated 250 by a user operation. That is, in the high-frequency heating device 100 illustrated in FIG. 1, the control unit 130 determines the shape of the object to be heated 150, but in the high-frequency heating device 200 illustrated in FIG. 17, the control unit 230 determines the shape of the object to be heated 250. Do not judge.
- the high-frequency heating device 200 is configured such that the object to be heated 250 has a relatively flat (horizontal) shape such as food on a flat plate or steak meat wrapped in wrap,
- a shape selection button is provided for each case when the shape is relatively vertically long, such as an eggplant, or when the shape is close to a cube, such as a food piled up on a plate or a deep range pack.
- the shape information of the object to be heated is acquired by the user pressing the shape selection button.
- the high-frequency heating device 200 does not require the above-described infrared sensor or laser sensor as compared with the high-frequency heating device 100, so that the cost can be reduced and the size can be further reduced.
- the units 210 are the heating chamber 101, the distribution unit 102, the first phase variable unit 103a and the second phase variable unit 103b, the first antenna 104a, and the second antenna 104b shown in FIG. And the high-frequency power generation unit 110.
- FIG. 18 is an external view of a high-frequency heating device 200 having a shape selection button according to Embodiment 2 of the present invention.
- FIG. 19 is a flowchart showing the basic operation of the high-frequency heating device 200 according to Embodiment 2 of the present invention.
- the shape information acquisition unit 220 acquires the shape information of the object to be heated 250 (step S201). As shown in FIG. 18, this is achieved by the shape selection buttons SB1 and SB2 included in the high-frequency heating device 200 receiving the designation of the shape of the object to be heated 250 by the user. That is, the shape selection buttons SB1 and SB2 function as the shape information acquisition unit 220.
- the shape selection button SB1 accepts a user designation indicating that the object to be heated 250 has a vertically long shape
- the shape selection button SB2 accepts a user designation indicating that the object to be heated 250 has a horizontally long shape.
- the control unit 230 switches to a predetermined mode (in-phase mode or reverse-phase mode) according to the shape information (step S202). Specifically, when the shape selection button SB1 receives the user's designation, the control unit 230 controls the phase variable unit 203a so that the phase difference between the high-frequency powers radiated from the antennas 204a and 204b is in the reverse phase mode. And 203b are set. On the other hand, when the shape selection button SB2 accepts the user's designation, the control unit 230 controls the phase of the phase variable units 203a and 203b so that the phase difference between the high-frequency powers radiated from the antennas 204a and 204b is in the in-phase mode. Set.
- controller 230 heats the article to be heated 250 in the switched mode (step S203).
- shape of the shape selection buttons SB1 and SB2 is not limited to the shape shown in FIG. 18, but may be a dial button or a touch panel. Further, as the shape selection button, there may be a button for accepting designation that the article to be heated 150 has a cubic shape.
- the shape information acquisition unit may include a shape selection button that accepts designation of the shape of the object to be heated by the user.
- a shape information acquisition part can be simplified and control can also be simplified.
- the high-frequency heating device according to the present embodiment has an in-phase mode and a reverse-phase mode regardless of shape information. Is different. That is, the first embodiment and the second embodiment are configured to acquire the shape information of the object to be heated and switch between the in-phase mode and the reverse-phase mode based on the shape information. In this configuration, the in-phase mode and the reverse-phase mode are always switched alternately.
- an infrared sensor, a shape selection button by a user operation, and the like are not necessary. Further, since control based on the shape information of the object to be heated is not necessary, the cost can be reduced and the apparatus can be downsized. In addition, by alternately switching between an in-phase mode that forms a distribution of electromagnetic field strength that has the same intensity in the horizontal direction and a reverse-phase mode that forms a distribution of electromagnetic field strength that has the same intensity in the vertical direction. Thus, it is possible to achieve efficient, uniform and stable heating without depending on the shape of the object to be heated and the arrangement of the object to be heated in the heating chamber.
- FIG. 20 is a block diagram showing a basic configuration of a high-frequency heating device according to Embodiment 3 of the present invention.
- the high-frequency heating device 300 shown in the figure does not include the shape information acquisition unit 120 and the shape information acquisition unit 220 as compared with the high-frequency heating device 100 shown in FIG. 1 and the high-frequency heating device 200 shown in FIG. That is, in high-frequency heating device 300, control unit 330 alternately switches between the in-phase mode and the reverse-phase mode at a predetermined ratio regardless of the shape information.
- the units 310 are the heating chamber 101, the distribution unit 102, the first phase variable unit 103a and the second phase variable unit 103b, the first antenna 104a, and the second antenna 104b shown in FIG. And the high-frequency power generation unit 110.
- FIG. 21 is a flowchart showing the basic operation of the high-frequency heating device 300 according to Embodiment 3 of the present invention.
- the control unit 330 alternately switches between the in-phase mode and the reverse-phase mode at a predetermined ratio (step S302).
- the predetermined ratio is set by the distribution of the electromagnetic field intensity in the in-phase mode and the distribution of the electromagnetic field intensity in the reverse-phase mode.
- the control part 330 heats the to-be-heated material 350 in each mode switched alternately (step S303).
- the distribution of the electromagnetic field strength shown in FIGS. 6B, 7B, 8B, 9B, and the like, and the distribution of the electromagnetic field strength shown in FIGS. 10, 11, 12, 13, etc. are alternately formed at a predetermined ratio. For this reason, even if the shape of the article to be heated 350 is vertically long or flat, it can always be stably and efficiently heated uniformly.
- the distribution of the electromagnetic field intensity is uniformly formed over a wide range in the heating chamber 301. Therefore, the object 350 to be heated in the heating chamber 301 is heated. It is possible to efficiently and uniformly heat the article to be heated 350 without depending on the arrangement of.
- the high-frequency heating device according to the present invention has been described based on the embodiments, but the present invention is not limited to these embodiments. Unless it deviates from the meaning of this invention, the form which carried out the various deformation
- a configuration having the shape selection button described in the second embodiment may be used together with the infrared sensor or the laser sensor described in the first embodiment.
- the present invention provides a high-frequency heating apparatus including a high-frequency power generation unit and a plurality of antennas that radiate high-frequency power to an object to be heated, regardless of the shape of the object to be heated. Therefore, it is useful as a cooking appliance such as a microwave oven.
Abstract
Description
本発明の実施の形態1に係る高周波加熱装置は、加熱室に収納された被加熱物を加熱する高周波加熱装置であって、高周波電力を発生する高周波電力発生部と、前記高周波電力発生部で発生された高周波電力の位相を変化させる位相可変部と、前記加熱室内の同一面に配置され、前記位相可変部で位相が変化されたことにより所定の位相差を有する複数の高周波電力を前記被加熱物に放射する複数のアンテナと、前記被加熱物の形状を示す形状情報を取得する形状情報取得部と、第1モードにおいて前記複数の高周波電力が同相となるように前記位相可変部を制御し、第2モードにおいて前記複数の高周波電力が逆相となるように前記位相可変部を制御する制御部とを備え、前記制御部は、前記形状情報取得部で取得された形状情報に基づいて、前記第1モードと前記第2モードとを切換える。
まず、上述の高周波加熱装置100の基本的な動作の1つの具体例である第1の動作について説明する。
次に、上述の高周波加熱装置100の基本的な動作の他の1つの具体例である第2の動作について説明する。
以下、本発明の実施の形態2について説明する。
以下、本発明の実施の形態3について説明する。
101、201、301 加熱室
102、202、302 分配部
103a、203a、303a 第1の位相可変部(位相可変部)
103b、203b、303b 第2の位相可変部(位相可変部)
104a、204a、304a 第1のアンテナ(アンテナ)
104b、204b、304b 第2のアンテナ(アンテナ)
105a、105b 位相設定信号
106 形状情報信号
110、210、310 高周波電力発生部
111、113 発振部
112 増幅部
114 位相同期ループ
115 周波数制御信号
120、220 形状情報取得部
130、230、330 制御部
150、250、350 被加熱物
SB1、SB2 形状選択ボタン
Claims (13)
- 加熱室に収納された被加熱物を加熱する高周波加熱装置であって、
高周波電力を発生する高周波電力発生部と、
前記高周波電力発生部で発生された高周波電力の位相を変化させる位相可変部と、
前記加熱室内の同一面に配置され、前記位相可変部で位相が変化されたことにより所定の位相差を有する複数の高周波電力を前記被加熱物に放射する複数のアンテナと、
前記被加熱物の形状を示す形状情報を取得する形状情報取得部と、
第1モードにおいて前記複数の高周波電力が同相となるように前記位相可変部を制御し、第2モードにおいて前記複数の高周波電力が逆相となるように前記位相可変部を制御する制御部とを備え、
前記制御部は、
前記形状情報取得部で取得された形状情報に基づいて、前記第1モードと前記第2モードとを切換える
高周波加熱装置。 - 前記複数の高周波電力が同相とは、前記所定の位相差が実質的に0度であり、
前記複数の高周波電力が逆相とは、前記所定の位相差が実質的に180度である
請求項1に記載の高周波加熱装置。 - 前記制御部は、
前記同一面に垂直な方向における前記被加熱物の寸法に対する前記同一面に平行な方向における前記被加熱物の寸法の比が大きいほど、前記第2モードの時間長に対する前記第1モードの時間長の比が大きくなるように前記第1モードと前記第2モードとを加熱中に切換える
請求項1又は2に記載の高周波加熱装置。 - 前記制御部は、
前記同一面に垂直な方向における前記被加熱物の寸法に対する前記同一面に平行な方向における前記被加熱物の寸法の比が、
1より大きい第1の値以上の場合には、前記第1モードに切換え、
1未満の第2の値以下の場合には、前記第2モードに切換える
請求項1又は2に記載の高周波加熱装置。 - 前記制御部は、
前記同一面に垂直な方向における前記被加熱物の寸法に対する前記同一面に平行な方向における前記被加熱物の寸法の比が実質的に1の場合には、前記第1モードの時間長と前記第2モードの時間長とがほぼ等しくなるように前記第1モードと前記第2モードとを加熱中に切換える
請求項1又は2に記載の高周波加熱装置。 - 前記制御部は、前記形状情報取得部で取得された形状情報に基づいて、前記同一面に垂直な方向における前記加熱物の寸法に対する前記同一面に平行な方向における前記被加熱物の寸法の比を特定し、特定した比に基づき、前記第1モードと前記第2モードとを切換える
請求項3~5のいずれか1項に記載の高周波加熱装置。 - 前記同一面は、前記加熱室の底面又は上面であり、
前記制御部は、
前記被加熱物が、平皿に盛られた食品である場合には、前記第1モードに切換え、
前記被加熱物が、銚子に入った酒である場合には、前記第2モードに切換える
請求項1~6のいずれか1項に記載の高周波加熱装置。 - 前記制御部は、
前記第1モード及び前記第2モードを交互に繰り返す
請求項1~7のいずれか1項に記載の高周波加熱装置。 - 前記形状情報取得部は、前記被加熱物の外形形状や寸法を検出するセンサである
請求項1~8のいずれか1項に記載の高周波加熱装置。 - 前記形状情報取得部は、ユーザによる前記被加熱物の形状の指定を受け付ける形状選択ボタンである
請求項1~8のいずれか1項に記載の高周波加熱装置。 - 前記複数のアンテナは、平面アンテナである
請求項1~10のいずれか1項に記載の高周波加熱装置。 - 加熱室に収納された被加熱物を加熱する高周波加熱装置であって、
高周波電力を発生する高周波電力発生部と、
前記高周波電力発生部で発生された高周波電力の位相を変化させる位相可変部と、
前記加熱室内の同一面に配置され、前記位相可変部で位相が変化されたことにより所定の位相差を有する複数の高周波電力を前記被加熱物に放射する複数のアンテナと、
第1モードにおいて前記複数の高周波電力が同相となるように前記位相可変部を制御し、第2モードにおいて前記複数の高周波電力が逆相となるように前記位相可変部を制御する制御部とを備え、
前記制御部は、前記第1モードと前記第2モードとを交互に切換える
高周波加熱装置。 - 加熱室内の同一面に配置され、所定の位相差を有する複数の高周波電力を被加熱物に放射する複数のアンテナを有し、前記被加熱物を加熱する高周波加熱方法であって、
前記被加熱物の形状を示す形状情報を取得する取得ステップと、
取得された形状情報に基づいて、前記同一面に垂直な方向における前記被加熱物の寸法に対する平行な方向における前記被加熱物の寸法の比を特定する特定ステップと、
特定された比に基づき、前記複数の高周波電力を同相とする第1期間の時間長、及び、前記複数の高周波電力を逆相とする第2期間の時間長を決定する決定ステップと、
前記第1期間において、決定された前記第1期間の時間長だけ前記複数の高周波電力を放射し、前記第2期間において、決定された前記第2期間の時間長だけ前記複数の高周波電力を放射することにより、前記被加熱物を加熱する加熱ステップとを含む
高周波加熱方法。
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EP10835652.8A EP2512206A4 (en) | 2009-12-09 | 2010-11-10 | HIGH FREQUENCY HEATING DEVICE AND HIGH FREQUENCY HEATING PROCESS |
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US10301989B2 (en) | 2016-01-19 | 2019-05-28 | Fujitsu Limited | Microwave applicator, exhaust gas purifier, heater, and chemical reactor |
US10876458B2 (en) | 2017-03-10 | 2020-12-29 | Fujitsu Limited | Microwave irradiation device, exhaust purification apparatus, automobile and management system |
JP2019087411A (ja) * | 2017-11-07 | 2019-06-06 | 国立研究開発法人産業技術総合研究所 | 被加熱体の加熱領域制御方法、化学反応方法、及びマイクロ波照射システム |
JP7220442B2 (ja) | 2017-11-07 | 2023-02-10 | 国立研究開発法人産業技術総合研究所 | 被加熱体の加熱領域制御方法、化学反応方法、及びマイクロ波照射システム |
Also Published As
Publication number | Publication date |
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US20120103975A1 (en) | 2012-05-03 |
CN102511198B (zh) | 2013-10-30 |
CN102511198A (zh) | 2012-06-20 |
US9398644B2 (en) | 2016-07-19 |
JP4995351B2 (ja) | 2012-08-08 |
EP2512206A4 (en) | 2013-11-13 |
EP2512206A1 (en) | 2012-10-17 |
JPWO2011070721A1 (ja) | 2013-04-22 |
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