WO2009104403A1 - 誘導加熱調理器 - Google Patents
誘導加熱調理器 Download PDFInfo
- Publication number
- WO2009104403A1 WO2009104403A1 PCT/JP2009/000710 JP2009000710W WO2009104403A1 WO 2009104403 A1 WO2009104403 A1 WO 2009104403A1 JP 2009000710 W JP2009000710 W JP 2009000710W WO 2009104403 A1 WO2009104403 A1 WO 2009104403A1
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- WIPO (PCT)
- Prior art keywords
- heating
- output
- increase amount
- temperature
- preheating
- Prior art date
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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
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/12—Cooking devices
- H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
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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
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
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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
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/04—Heating plates with overheat protection means
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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
- H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
- H05B2213/07—Heating plates with temperature control means
Definitions
- the present invention relates to an induction heating cooker that heats an object to be heated such as a cooking container.
- induction heating cookers that induction-heat cooking containers such as pans and frying pans with heating coils have been widely used in general homes and commercial kitchens.
- the induction heating cooker is provided with a thermal element such as a thermistor on the lower surface of the top plate, detects the temperature of the bottom surface of the cooking container with the thermal element, and controls the heating coil so that the detected temperature matches the target temperature. Yes. For example, when preheating the cooking container before fried food cooking, control is performed so that the temperature detected by the thermal element reaches the target temperature during preheating.
- the temperature rise at the bottom of the cooking container is moderate when a large amount of oil or food is in the pan (when the load is large) as in fried food cooking, but when only a small amount of oil is put into the pan (load) Is small).
- the thermosensitive element detects the temperature of the bottom surface of the cooking container placed on the top plate by detecting the heat conducted from the cooking container to the top plate.
- followability is not good. Therefore, when the temperature of the bottom surface of the cooking container rises rapidly, an error between the actual temperature of the bottom surface of the cooking container and the temperature detected by the thermal element increases.
- thermosensitive element when the load is small, for example, a cooking container having a thin bottom plate is used.
- heating may be delayed as described below.
- thermosensitive element detects the temperature of the bottom surface of the cooking container by detecting the temperature of the bottom surface of the top plate
- the gap between the bottom surface of the cooking container and the top plate at the position where the temperature is detected by the thermosensitive element is large. And greatly affects the relationship between the detected temperature and the actual bottom temperature of the cooking container.
- the pan bottom is warped, a large gap is formed between the pan bottom and the top plate.
- the temperature gradient calculated based on the temperature detected by the thermal element is gentler than the actual temperature gradient at the bottom of the pan. For this reason, there was a case where the heating stop was delayed.
- the bottom temperature of the cooking container increases rapidly.
- the stop of heating since the stop of heating is controlled based on the temperature gradient calculated based on the detected temperature of the thermosensitive element, the stop of heating may be delayed. If the stoppage of heating is delayed, the temperature of the bottom surface of the cooking container far exceeds the target temperature, and then a problem arises that it takes a long time to stabilize at the target temperature. On the other hand, when the load is small, in order for the conventional induction heating cooker to prevent the temperature of the bottom surface of the cooking container from exceeding the target temperature, heating must be started with low heating power. However, in this case, there arises a problem that the time until the temperature of the bottom surface of the cooking container reaches the target temperature becomes long.
- the temperature of the object to be heated reaches the target temperature in a short time and the transient temperature with respect to the target temperature is abnormally high. There is a problem that it cannot be prevented. Therefore, when cooking a fried food using a frying pan, preheating was completed in a short time, and it was not possible to prevent the frying pan from being excessively heated and deformed or discolored.
- An object of the present invention is to provide an induction heating cooker that prevents a transient temperature from becoming abnormally high. Specifically, it is intended to provide an induction heating cooker that completes preheating in a short time during cooking of fried food using a frying pan and prevents the frying pan from being excessively heated and deformed or discolored. Objective. In addition, an induction heating cooker is provided that maintains heating to an appropriate temperature by continuing heating after completion of preheating.
- an induction heating cooker includes a top plate formed of a material that transmits infrared rays, and a cooking vessel placed on the top plate by being supplied with a high-frequency current.
- the operation mode is, Including a preheating heating mode in which preheating is performed before heating, and the control unit sets the cooking container to the preheating heating mode when the operation mode is set to the preheating heating mode.
- the predetermined initial value is an output of the infrared sensor obtained when a cooking container having a temperature at which the gradient of the increase in the output of the infrared sensor with respect to the temperature change of the cooking container is set to a predetermined value or less is placed on the top plate. It may be a value.
- the second heating output may be used for heating.
- the first predetermined increase amount may be variable.
- the induction heating cooker further includes an input current detection unit that detects the magnitude of the input current supplied from the power source, and a heating coil current detection unit that detects the magnitude of the heating coil current flowing through the heating coil. May be.
- the control unit determines the material of the cooking container based on the detected magnitude of the input current and the magnitude of the heating coil current, and based on the determined cooking container material, A predetermined increase amount of 1 may be set.
- the induction heating cooker may further include a buoyancy reduction plate disposed between the top plate and the heating coil, and a temperature detection unit that detects the temperature of the buoyancy reduction plate.
- the control unit may set the first predetermined increase amount based on the temperature of the buoyancy reduction plate detected by the temperature detection unit after starting heating with the first heating output.
- the induction heating cooker includes a buoyancy reduction plate disposed between the top plate and the heating coil, a first temperature detection unit that detects the temperature of the buoyancy reduction plate, and a second temperature that detects the temperature of the top plate. And a temperature detection unit.
- the control unit determines whether the bottom surface of the cooking container is warped based on the difference between the temperature detected by the first temperature detection unit and the temperature detected by the second temperature detection unit, The first predetermined increase amount may be set depending on the presence or absence of warpage.
- the control unit may include an input power integration unit that integrates the input power.
- the first heating integrated by the input power integration unit when the integrated value of the input power after starting heating with the output exceeds a predetermined integrated power value, the notification unit may be notified that the preheating has been completed, and the process may enter the standby mode.
- the predetermined integrated power value may be variable.
- the induction heating cooker further includes an input current detection unit that detects the magnitude of the input current supplied from the power source, and a heating coil current detection unit that detects the magnitude of the heating coil current flowing through the heating coil. May be.
- the controller determines the material of the cooking container based on the detected magnitude of the input current and the magnitude of the heating coil current at the start of the preheating mode, and performs predetermined power integration based on the determined cooking container material A value may be set.
- the operation unit may further include a thermal power setting unit for the user to instruct the thermal power setting of the inverter circuit.
- a thermal power setting unit for the user to instruct the thermal power setting of the inverter circuit.
- the mode shifts to the heating mode in which heating is performed with the fourth heating output corresponding to the instructed thermal power.
- the increase amount of the output value of the infrared sensor exceeds the fourth predetermined increase amount
- the heating is stopped with the fifth heating output smaller than the fourth heating output or the heating is stopped, and the output value of the infrared sensor is increased.
- the heating may be performed with the fourth heating output.
- the fourth predetermined increase amount may be larger than the second predetermined increase amount.
- the fourth predetermined increase amount may be equal to the first predetermined increase amount.
- the infrared sensor may be provided in the middle of the heating coil in the radial direction.
- the infrared sensor may comprise a silicon photodiode.
- an easy-to-use preheating function can be realized using an infrared sensor. That is, by measuring the output change of the infrared sensor and detecting the temperature of the bottom surface of the cooking container, the temperature of the bottom surface of the actual cooking container can be accurately detected with good thermal response. Therefore, the heating output can be increased and the temperature of the object to be heated can reach the target temperature in a short time, and the output can be immediately reduced to a temperature suitable for preheating. Therefore, it is possible to prevent the transient temperature with respect to the target temperature from becoming abnormally high. Specifically, a preheating mode for operating the preheating function is provided, and in the preheating mode, the temperature is controlled using an infrared sensor.
- the heating power in the preheating mode can be set large, and preheating can be completed in a short time without damaging the frying pan.
- an object to be heated can be kept at an appropriate temperature by continuing the heating after the preheating is completed.
- the block diagram which shows the structure of the induction heating cooking appliance of Embodiment 1 of this invention.
- movement of the outline of the induction heating cooking appliance of Embodiment 1-3 of this invention (A) is a figure which shows the example of a display of the display part which is selecting "preheating heating mode", (b) is a figure which shows the example of a display of the display part in preheating mode, (c) is a figure of the display part in standby mode The figure which shows a display example, (d) is a figure which shows the example of a display of the display part in heating mode Preheating mode flowchart Standby mode flowchart Heating mode flowchart (A) is a figure which shows the temperature of a cooking container, (b) is a figure which shows the output increase amount of an infrared sensor, (c) is a figure
- Embodiment 1 1.1 Configuration of Induction Heating Cooker
- FIG. 1 shows the configuration of the induction heating cooker according to the first embodiment of the present invention.
- the induction heating cooker of this embodiment is provided with a “preheating function” that performs preheating until a target temperature is reached before heating with high heating power such as fried food.
- the induction heating cooker of this embodiment performs control at the time of preheating and heating by using an output signal corresponding to the temperature of the object to be heated 10 by the infrared sensor 3 having good thermal response.
- This induction heating cooker is used by being incorporated in a cabinet such as a kitchen, for example.
- An induction heating cooker includes a top plate 1 provided on the upper surface of a device, and a heating coil 2 (outside) that induction-heats an object to be heated 10 on the top plate 1 by generating a high-frequency magnetic field.
- the top plate 1 is made of an electrical insulator such as glass and transmits infrared rays.
- the heating coil 2 is provided below the top plate 1.
- the heating coil 2 is divided into two concentric circles to form an outer coil 2a and an inner coil 2b.
- a gap is provided between the outer coil 2a and the inner coil 2b.
- the object to be heated 10 generates heat due to the eddy current generated by the high frequency magnetic field of the heating coil 2.
- an operation unit 4 is provided for the user to instruct start / stop of heating.
- a display unit 12 is provided between the operation unit 4 and the article to be heated 10.
- a light source 14 for irradiating the operation unit 4 and the display unit 12 is provided below the operation unit 4 and the display unit 12.
- the infrared sensor 3 is provided below the gap between the outer coil 2a and the inner coil 2b. Since the high-frequency magnetic field of the heating coil 2 is strong at this position, it is possible to detect the substantially maximum temperature (output corresponding to the temperature in the middle of the cooking container in the radial direction) of the bottom surface of the object to be heated 10. Infrared radiation based on the bottom surface temperature of the object to be heated 10 radiated from the bottom surface of the object to be heated 10 is incident through the top plate 1, passes through a gap between the outer coil 2 a and the inner coil 2 b, and is an infrared sensor. 3 is received. The infrared sensor 3 detects received infrared rays and outputs an infrared detection signal 35 based on the detected amount of infrared rays.
- a rectifying / smoothing unit 6 that converts an AC voltage supplied from the commercial power supply 5 into a DC voltage, a DC voltage supplied from the rectifying / smoothing unit 6 to generate a high-frequency current, and the generated high-frequency current Is provided to the heating coil 2.
- an input current detection unit 9 is provided between the commercial power supply 5 and the rectifying / smoothing unit 6 for detecting the magnitude of the input current flowing from the commercial power supply 5 to the rectifying / smoothing unit 6.
- the rectifying / smoothing unit 6 includes a full-wave rectifier 61 composed of a bridge diode, and a low-pass filter composed of a choke coil 62 and a smoothing capacitor 63 connected between the output terminals of the full-wave rectifier 61.
- the inverter circuit 7 includes a switching element 73 (IGBT in this embodiment), a diode 72 connected in antiparallel with the switching element 73, and a resonance capacitor 71 connected in parallel with the heating coil 2. When the switching element 73 of the inverter circuit 7 is turned on / off, a high frequency current is generated.
- the inverter circuit 7 and the heating coil 2 constitute a high frequency inverter.
- the induction heating cooker of the present embodiment further includes a control unit 8 that controls the operation of the induction heating cooker.
- the control unit 8 includes a heating control unit 81 that controls the high-frequency current supplied from the inverter circuit 7 to the heating coil 2 by controlling on / off of the switching element 73 of the inverter circuit 7.
- the heating control unit 81 controls on / off of the switching element 73 based on the signal transmitted from the operation unit 4 and the temperature detected by the infrared sensor 3.
- the control unit 8 further includes an input power integration unit 82 that integrates the input power.
- the input power integration unit 82 integrates the input power based on the input current detected by the input current detection unit 9. For example, the input power integration unit 82 calculates an integrated value of input power after starting preheating. If the input current can be regarded as substantially constant, the input power integration unit 82 may calculate the integrated value of the input power based on the elapsed time. Since input power is obtained from the product of input current and input voltage, the input power may be obtained by measuring the input voltage. However, the input power is assumed to be constant, and the input power is simply integrated based on the input current and elapsed time. A value may be calculated.
- the induction heating cooker of this embodiment further has a notification unit 13.
- the notification unit 13 is, for example, a speaker that outputs an electronic sound. Specifically, when the preheating is completed, the notification unit 13 outputs an electronic sound notifying that the preheating has been completed.
- FIG. 2 shows a top view of the top plate 1.
- the heating coils 2 are respectively disposed below the heating unit 11.
- a display unit 12 is provided on the front side (user side) of the heating unit 11.
- the control unit 8 controls the light source 14 to turn on, blink, or turn off characters or illustrations included in the display unit 12.
- the display unit 12 includes an operation mode display unit 12a indicating the operation mode, a thermal power display unit 12b indicating the output level of the heating coil 2, and a timer display unit 12c indicating the remaining time of the timer.
- the operation mode is a mode in which the operation of the inverter circuit 7 is set to a setting suitable for various cooking (for example, preheating, heating, deep-fried food, boiling water, and rice cooking).
- the induction heating cooker of the present embodiment includes a “preheating heating mode”, a “heating mode”, a “fried food mode”, a “water heater mode”, and a “rice cooking mode”. Five operation modes are provided.
- the induction heating cooker of the present embodiment when the “preheating heating mode” is selected by the user, as described later in detail, “preheating mode” ⁇ “standby mode” ⁇ “heating mode” in this order. Operate.
- the operation unit 4 is provided on the front side (user side) of the display unit 12.
- the operation unit 4 includes a plurality of capacitance type switches 4a to 4f.
- the switches 4a to 4f are switches for inputting instructions related to cooking, and are provided corresponding to the number of heating units 11.
- Each switch 4a to 4f is assigned a specific function.
- the switch 4a is a turn-on / off switch to which a function for controlling the start and end of cooking is assigned.
- the switch 4b is a menu switch to which a function for switching the operation mode to any one of “preheating heating mode”, “heating mode”, “fried food mode”, “water heater mode”, and “rice cooking mode” is assigned.
- characters and illustrations in the operation mode display section 12a blink in the order of “heating”, “preheating heating”, “fried food”, “water heater”, “rice cooking”, and the operation mode can be selected.
- the operation mode of “heating mode”, “preheating heating mode”, “fried food mode”, “water heater mode”, or “rice cooking mode” it is selected when the switch 4a is operated.
- the operation mode is determined, the display corresponding to the determined operation mode is turned on, and the display corresponding to the operation mode not determined is turned off.
- the switch 4c is a thermal power setting switch to which a function for increasing the thermal power is assigned.
- the switch 4d is a thermal power setting switch to which a function for reducing the thermal power is assigned. When operating in the “heating mode” or “standby mode”, the heating power can be set by the heating power setting switches 4c and 4d.
- the switches 4e and 4f are timer switches to which a function for setting the heating time is assigned.
- control unit 8 When the control unit 8 detects that the switches 4a to 4f are pressed, the control unit 8 controls the inverter circuit 7 based on the pressed switches to control the high-frequency current supplied to the heating coil 2.
- FIG. 3 shows a circuit diagram of the infrared sensor 3.
- the infrared sensor 3 includes a photodiode 31, an operational amplifier 32, and resistors 33 and 34. One end of each of the resistors 33 and 34 is connected to the photodiode 31, and the other end is connected to the output terminal and the inverting output terminal of the operational amplifier 32.
- the photodiode 31 is a light receiving element formed of silicon or the like through which a current flows when irradiated with infrared light having a wavelength of about 3 microns or less that passes through the top plate 1.
- the photodiode 31 is provided at a position where it can receive infrared rays emitted from the cooking container.
- the current generated by the photodiode 31 is amplified by the operational amplifier 32 and is output to the control unit 8 as an infrared detection signal 35 (corresponding to the voltage value V) indicating the temperature of the object to be heated 10.
- the infrared sensor 3 receives infrared rays emitted from the object to be heated 10, and therefore has better thermal response than a thermistor that detects the temperature via the top plate 1.
- FIG. 4 shows the output characteristics of the infrared sensor 3.
- the horizontal axis represents the bottom surface temperature of the object to be heated 10 such as a cooking container
- the vertical axis represents the voltage value of the infrared detection signal 35 output from the infrared sensor 3.
- the infrared detection signal 35 has output characteristics 35a to 35c based on the influence of ambient light.
- the output characteristic 35a indicates the output of the infrared detection signal 35 when no disturbance light is present, that is, when only infrared rays emitted from the article to be heated 10 are received.
- the output characteristic 35 b indicates the output of the infrared detection signal 35 when weak disturbance light is incident on the infrared sensor 3.
- the output characteristic 35c indicates the output of the infrared detection signal 35 in the case where strong disturbance light such as sunlight enters.
- the infrared sensor 3 of the present embodiment outputs the infrared detection signal 35 when the bottom surface temperature of the object to be heated 10 is about 250 ° C. or higher, as shown by the output characteristic 35a, and when the temperature is lower than about 250 ° C.
- the detection signal 35 is not output.
- not outputting the infrared detection signal 35 means not only outputting the infrared detection signal 35 but also not substantially outputting it, that is, the control unit 8 is based on a change in the magnitude of the infrared detection signal 35.
- the output value of the infrared detection signal 35 is non-linear in which the slope of increase increases as the temperature of the object to be heated becomes higher when the signal output range, that is, the temperature of the object to be heated 10 is about 250 ° C. or higher. It exhibits a monotonically increasing characteristic and increases as a power function.
- the infrared detection signal 35 output from the infrared sensor 3 is affected by ambient light. Therefore, in the present embodiment, the completion of preheating, that is, whether or not the object to be heated 10 has reached the target temperature is determined based on whether the output increase amount ⁇ V of the voltage value V of the infrared detection signal 35 from when the preheating is started is the first. Judgment is made based on whether or not the predetermined increase amount ⁇ V1 is exceeded. Details of the predetermined increments ⁇ V1 and ⁇ V2 in FIG. 4 will be described later with reference to FIGS.
- the controller 8 starts the operation in the preheating mode (S503).
- the preheating mode the temperature of the cooking container is controlled to reach a predetermined target temperature (preheating temperature).
- the control unit 8 starts the operation in the standby mode (S504).
- the standby mode the temperature of the object to be heated 10 at the time of completion of preheating is controlled to be maintained until the heating power is set by the user.
- the control unit 8 starts the operation in the heating mode (S505).
- the inverter circuit 7 is controlled based on the thermal power set by the user. If the operation mode determined by the user is not the preheating heating mode (No in S502), the control unit 8 determines whether the operation mode determined by the user is the heating mode (S506). If the operation mode determined by the user is the heating mode (Yes in S506), the control unit 8 starts the operation in the heating mode without passing through the preheating mode and the standby mode (S505). If the operation mode determined by the user is not the heating mode (No in S506), the control unit 8 operates based on another operation mode selected and determined by the user (S507). For example, if the selected and determined operation mode is the deep-fried food mode, the operation in the deep-fried food mode is started. Since the present embodiment is characterized by the “preheating heating mode”, details of other operation modes are omitted in the following description.
- FIGS. 6A to 6D show examples of display on the display unit 12 when the user selects and determines the “preheating heating mode”. Specifically, FIG. 6A shows a display example when the “preheating heating mode” is selected as the operation mode, FIG. 6B shows a display example during the preheating mode, and FIG. ) Shows a display example during the standby mode, and FIG. 6D shows a display example during the heating mode.
- FIG. 6A shows a display example when the “preheating heating mode” is selected as the operation mode
- FIG. 6B shows a display example during the preheating mode
- FIG. ) Shows a display example during the standby mode
- FIG. 6D shows a display example during the heating mode.
- the preheating heating mode first, the preheating mode is started and the preheating is started. At this time, the characters “heating” are lit and the characters “preheating” are blinking (FIG. 6B). This indicates that heating is performed and the preheating function is operating.
- the control unit 8 invalidates the heating power change based on the operation even if the heating power setting switches 4c and 4d are operated. In order to make it easier for the user to understand that the operation of the thermal power setting switches 4c and 4d is invalid, the thermal power bar 111 is not displayed on the display unit 12 in the preheating mode.
- the preheat mode is switched to the standby mode.
- the control unit 8 accepts an operation of the thermal power setting switches 4c and 4d by the user.
- the characters “preheat” change from blinking to lighting, and the thermal power bar 111 is displayed (FIG. 6C).
- the display of the thermal power bar 111 at this time corresponds to the thermal power value when the preheating mode is completed.
- FIG. 6C shows that the thermal power after completion of the preheating mode is “5”. Displaying the thermal power bar 111 indicates to the user that the operation of the thermal power setting switches 4c and 4d is effective.
- the control unit 8 validates the thermal power change based on the operation of the thermal power setting switches 4c and 4d.
- the mode is changed to the heating mode.
- the characters “preheating” are turned off, and only the characters “heating” are turned on (FIG. 10D).
- FIG. 7 shows a flow corresponding to the preheating mode (S503) in FIG.
- the control unit 8 starts preheating with a predetermined heating power amount (first heating output, for example, 3 kW) (S701).
- the control unit 8 performs control so that the temperature of the cooking container reaches a predetermined target temperature (for example, 250 ° C. to 270 ° C.).
- the control unit 8 determines whether or not the heating power setting switches 4c and 4d are operated (S702).
- the control unit 8 invalidates the change of the heating power based on the operation (S703).
- the controller 8 determines whether or not the output increase amount ⁇ V of the infrared sensor after the start of heating has reached the first predetermined increase amount ⁇ V1 or more (S704).
- the control unit 8 determines that the object to be heated 10 has reached the preheating target temperature and notifies the completion of the preheating. By outputting an electronic sound to the notification unit 13, the completion notification of the preheating is performed (S706).
- the control unit 8 ends the preheating mode and shifts to the standby mode.
- the control unit 8 determines whether or not the integrated value of the input power after starting the preheating exceeds a predetermined value.
- FIG. 8 shows a flow corresponding to the standby mode (S504) of FIG.
- the control unit 8 performs control so that the temperature of the cooking container is maintained at the temperature at the completion of preheating (for example, approximately 250 ° C.).
- a thermal power bar 111 is displayed on the display unit 12 in order to make it easy for the user to understand that the operation of the thermal power setting switches 4c and 4d is effective (FIG. 6C).
- the control unit 8 shifts to the standby mode, it heats with a heating power amount (second heating output, for example, 1 kW) smaller than that in the preheating mode (S801).
- the control unit 8 determines whether or not the heating power setting switches 4c and 4d are operated (S802). When the thermal power setting switches 4c and 4d are not operated (No in S802), whether or not the output increase amount ⁇ V of the infrared sensor 3 is equal to or larger than the second predetermined increase amount ⁇ V2 that is larger than the first predetermined increase amount ⁇ V1. Is determined (S803). When the output increase amount ⁇ V of the infrared sensor 3 becomes equal to or larger than the second predetermined increase amount ⁇ V2 (Yes in S803), the heating power amount is set to a value smaller than the second heating output (third heating output, for example, 0 kW) (S804).
- the control unit 8 determines whether or not the output increase amount ⁇ V of the infrared sensor 3 is smaller than a third predetermined increase amount ⁇ V3 that is equal to or less than the second predetermined increase amount ⁇ V2 (S805).
- the heating power amount is returned to the second heating output (S801).
- the output increase amount ⁇ V of the infrared sensor 3 is not smaller than the third predetermined increase amount ⁇ V3 (No in S805), the heating with the third heating output is continued.
- FIG. 9 shows a flow corresponding to the heating mode (S505) of FIG.
- the control unit 8 performs control so as to maintain a temperature corresponding to the heating power set by the user during the heating mode.
- heating is started with a heating power amount (fourth heating output) corresponding to the heating power set by the user (S901).
- the control unit 8 determines whether the end of heating is instructed by operating the off / on switch 4a (S902). When the end of heating is not instructed (No in S902), the control unit 8 determines whether or not the output increase amount ⁇ V of the infrared sensor 3 is equal to or greater than a fourth predetermined increase amount ⁇ V4 (S903).
- the control unit 8 sets the heating power amount to the fifth heating value smaller than the fourth heating output.
- the output is changed (for example, 0 kW) (S904).
- the control unit 8 determines whether or not the output increase amount ⁇ V of the infrared sensor 3 is smaller than a fifth predetermined increase amount ⁇ V5 that is equal to or less than the fourth predetermined increase amount ⁇ V4 (S905).
- the control unit 8 returns the heating power amount to the fourth heating output (S901).
- the output increase amount ⁇ V of the infrared sensor 3 is not smaller than the fifth predetermined increase amount ⁇ V5 (No in S905), the heating by the fifth heating output is continued. If the end of heating is instructed during the heating mode (Yes in S902), the heating ends.
- the control unit 8 starts preheating with a first heating output (for example, 3 kW). Preheating is continued with the first heating output until the output increase amount ⁇ V of the infrared sensor 3 reaches the first predetermined increase amount ⁇ V1. At time t1, the output increase amount ⁇ V of the infrared sensor 3 reaches the first predetermined increase amount ⁇ V1. The control unit 8 determines that the article to be heated 10 has reached the preheating target temperature, and shifts to the standby mode.
- a first heating output for example, 3 kW
- the control unit 8 starts heating with a second heating output (for example, 1 kW) smaller than that in the preheating mode (time t1 to t2).
- a second heating output for example, 1 kW
- the temperature distribution of the article to be heated 10 is averaged. Therefore, at time t1, the output of the infrared sensor 3 provided at a position where the substantially maximum temperature of the bottom surface of the article to be heated 10 can be detected temporarily decreases. Thereafter, the output of the infrared sensor 3 increases again.
- the output increase amount ⁇ V of the infrared sensor 3 reaches a second predetermined increase amount ⁇ V2 that is larger than the first predetermined increase amount ⁇ V1.
- the control unit 8 changes the heating power amount to a third heating output (for example, 0 kW) smaller than the second heating output.
- a third heating output for example, 0 kW
- the output increase amount ⁇ V of the infrared sensor 3 becomes smaller than the third predetermined increase amount ⁇ V3 that is equal to or less than the second predetermined increase amount ⁇ V2.
- the controller 8 returns the heating power amount to the second heating output (for example, 1 kW).
- the heating power amount is decreased to the third heating output (for example, 0 kW), and the infrared sensor 3
- the output increase amount ⁇ V becomes smaller than the third predetermined increase amount ⁇ V3
- the operation of returning to the second heating output for example, 1 kW
- the temperature of the object to be heated 10 is maintained within a temperature range suitable for preheating that does not fall below the temperature at the time of completion of preheating (for example, approximately 250 ° C.).
- the influence of static disturbance light can be suppressed by detecting the temperature of the object to be heated 10 based on the output increase ⁇ V of the infrared sensor 3 from the heating start time. Further, by detecting the temperature of the object to be heated 10 from the output increase amount ⁇ V of the infrared sensor 3 from the start of heating, it is practically acceptable without being greatly affected by the temperature of the object to be heated 10 at the start of heating. Preheating can be completed within the temperature range, and the temperature of the article to be heated 10 after preheating can be maintained at an appropriate temperature.
- the temperature of the object to be heated 10 at the start of heating is such a temperature that the output of the infrared sensor 3 can be detected, for example, even when it is higher than about 250 ° C. in FIG.
- the output of the infrared sensor 3 increases in its magnitude, and the magnitude of the output value increases abruptly (in a power function).
- the temperature difference of the article to be heated 10 at the time when the completion of preheating due to the difference in temperature of the article 10 is detected is suppressed to a practically acceptable level.
- the temperature of the cooking container at the start of heating is 267 ° C.
- the temperature reaches the first predetermined increase amount ⁇ V 1 immediately after that and the preheating is completed, and thereafter the temperature does not exceed 274 ° C. (corresponding to ⁇ V 2). Is maintained (see FIG. 4).
- the temperature at the completion of this preheating (approximately 267 ° C.) and the upper limit value (274 ° C.) of the standby mode are practically acceptable temperatures.
- the control unit 8 shifts to the heating mode and starts heating at the fourth heating output corresponding to the set thermal power.
- the fourth predetermined increase amount ⁇ V4 and the value of the fifth predetermined increase amount ⁇ V5 that is equal to or less than the fourth predetermined increase amount ⁇ V4 are determined according to the set fourth heating output. For example, when the set fourth heating output is larger than the second heating output, the fourth predetermined increase amount ⁇ V4 is set larger than the second predetermined increase amount ⁇ V2. Further, for example, when the set fourth heating output is smaller than the second heating output, the fourth predetermined increase amount ⁇ V4 is set equal to the first predetermined increase amount ⁇ V1.
- the output increase amount ⁇ V of the infrared sensor 3 reaches the fourth predetermined increase amount ⁇ V4.
- the control unit 8 reduces the heating power amount to a fifth heating output (for example, 0 kW) smaller than the fourth heating output.
- the output increase amount ⁇ V of the infrared sensor 3 becomes smaller than the fifth predetermined increase amount ⁇ V5 which is equal to or less than the fourth predetermined increase amount ⁇ V4.
- the controller 8 returns the heating power amount to the fourth heating output.
- the heating power amount is decreased to the fifth heating output (for example, 0 kW), and the infrared sensor 3
- the output increase amount ⁇ V becomes smaller than the fifth predetermined increase amount ⁇ V5
- the operation of returning to the fourth heating output is repeated.
- the effect of the configuration in which the temperature of the object to be heated 10 is detected by the output increase amount ⁇ V of the infrared sensor 3 from the start of heating is the temperature detection configuration of the object to be heated by the second predetermined increase amount ⁇ V2 described above.
- the fourth predetermined increase amount ⁇ V4 is set to an increase amount of the output voltage of the infrared sensor 3 until the temperature of the part to be heated measured by the infrared sensor 3 reaches, for example, about 290 ° C. from the start of heating.
- the ignition temperature of a small amount of oil placed in the article to be heated can be suppressed so as not to exceed.
- the temperature of the object to be heated 10 is detected by the infrared sensor 3 having good thermal responsiveness. Therefore, the actual temperature of the object to be heated 10 is accurately determined. Can be detected. For example, even when the bottom surface of the cooking container is warped or the bottom surface of the cooking container is thin, the actual temperature of the object to be heated 10 can be accurately detected without causing a time delay. Can do. Therefore, even if preheating is started at a high heating power (first heating output, for example, 3 kW), the temperature of the object to be heated 10 does not greatly exceed the target temperature, and the temperature of the object to be heated 10 reaches the target temperature. This can be immediately detected by the infrared sensor 3. Therefore, preheating can be started with high thermal power. Therefore, the target temperature is reached in a short time. Therefore, preheating before heating can be completed in a short time even when cooking fried food that starts cooking with a small amount of oil and high heating power.
- first heating output for example, 3 kW
- the temperature of the object to be heated 10 does not greatly exceed the target temperature during preheating after the completion of preheating. Therefore, it is possible to prevent the heated object 10 such as a frying pan from being excessively heated and deformed or discolored.
- the standby mode when the heating power is lowered to the second heating output for heating, and the output increase amount ⁇ V of the infrared sensor 3 becomes smaller than the third predetermined increase amount ⁇ V3 that is equal to or less than the second predetermined increase amount ⁇ V2,
- the third heating output (for example, 0 kW) returns to the second heating output (for example, 1 kW). That is, even if the temperature after completion of preheating changes, the infrared sensor 3 immediately detects the change and controls to immediately return to the temperature after completion of preheating. Therefore, the temperature at the completion of preheating can be stabilized in a short time. That is, in the standby mode, the temperature after completion of preheating can be maintained.
- the temperature can be immediately returned to the temperature at the completion of preheating.
- the foodstuff in a cooking container can fully be heated and efficient heating can be implement
- the temperature after completion of preheating can be maintained, it is possible to prevent the object to be heated 10 from being heated excessively. For example, even when a small amount of oil pan is heated, the temperature of the pan does not rise rapidly in the standby mode. Therefore, a safe induction heating cooker can be provided.
- the thermal power setting is disabled and control is performed so as to automatically reach the appropriate temperature, so that preheating to a temperature different from the preheating target temperature can be prevented. Furthermore, since the thermal power setting is enabled after the preheating completion notification, the user can start cooking from an appropriate temperature state. Moreover, the user can change a thermal power arbitrarily according to a foodstuff after completion of preheating.
- thermal power bar 111 by disabling the thermal power bar 111 during preheating, it is possible to make it easier for the user to visually understand that the thermal power cannot be changed. Further, by displaying the thermal power bar 111 when the preheating is completed, the user can visually know that the preheating is completed and that the heating setting is possible. Therefore, usability is improved.
- the operation mode display unit 12a by turning on, blinking, or turning off the characters “Heating” and “Preheating” on the operation mode display unit 12a, it is easy for the user to visually understand which mode is currently operating. be able to. This improves usability. For example, during the preheating mode, the user can be informed that the preheating operation is in progress by turning on the characters “heating” and blinking the characters “preheating”. In addition, after the preheating is completed, the character “preheating” is switched from blinking to continuous lighting, so that the user can be informed that the preheating is completed and the temperature is maintained. In addition, when the standby mode is switched to the heating mode, the “preheat” character is turned off, and only the “heating” character is turned on, so that the user has exited the standby mode and has switched to the heating mode. Can be informed.
- the silicon photodiode 31 is used as the light receiving element of the infrared sensor 3, the infrared sensor 3 can be made inexpensive.
- the infrared sensor 3 is provided in the radial direction of the winding of the heating coil 2, that is, between the outer coil 2a and the inner coil 2b, and the outer coil 2a and the inner coil 2b are located at a position where the heating coil 2 has a strong high-frequency magnetic field.
- the bottom portion of the object to be heated 10 is measured at the upper part between the windings. Thereby, the high temperature close
- the power supply to the heating coil 2 can be controlled in a state in which the detection sensitivity for the high-temperature portion of the article to be heated 10 is higher, overheating can be prevented.
- preheating control is performed based on the output increase amount ⁇ V of the infrared sensor 3, preheating can be performed without being affected by disturbance noise such as light.
- the operation mode includes the “heating mode” for entering the “heating mode” without performing preheating and the “preheating heating mode” for performing preheating before performing heating. Can select whether or not to perform preheating, which improves usability.
- the standby mode may be shifted based on the increase amount of the output value of the infrared sensor 3 with respect to a predetermined initial output value.
- the predetermined initial output value is, for example, the top plate of the cooking container 10 having a low temperature (eg, 35 ° C.
- the predetermined initial output value is obtained when the cooking container 10 is placed on the top plate 1 at a low temperature so that the gradient of the output increase of the infrared sensor 3 with respect to the temperature change of the cooking container 10 is not more than the predetermined value.
- the output value of the infrared sensor 3 obtained as described above may be set to a value similar to that.
- it is possible to measure the output value of the infrared sensor by making the cooking container 10 an object having another equivalent emissivity or by preventing visible light from entering the infrared sensor 3. What is necessary is just to set it as the output value of the infrared sensor 3 obtained in the condition where the output corresponding to the light reception amount of the infrared sensor 3 is not made.
- the first predetermined increase amount ⁇ V1 to the fifth predetermined increase amount ⁇ V5 indicate the increase amount ⁇ V of the output value of the infrared sensor 3 with respect to the predetermined initial output value.
- the control unit 8 stores a predetermined initial output value in a storage unit (not shown) provided in the control unit 8, and calculates the difference between the output value of the infrared sensor 3 and the predetermined initial output value in a simple manner.
- the increase amount ⁇ V of the output value of the infrared sensor 3 can be calculated.
- the increase amount ⁇ V of the output value of the infrared sensor 3 is set as the increase amount of the output value of the infrared sensor 3 after the start of heating as in the first embodiment, the temperature of the cooking container 10 at the start of heating. Since the output sensitivity of the infrared sensor 3 is high when the temperature is high, when the temperature approaches the target temperature, the temperature at which the output is actually suppressed and controlled becomes higher than the target temperature, and the error from the target temperature increases.
- the increase amount ⁇ V of the output value of the infrared sensor 3 is measured in advance at a temperature at which the gradient of the output increase of the infrared sensor 3 with respect to the change in the bottom surface temperature of the cooking container 10 is substantially zero or a predetermined value or less.
- the first predetermined increase amount ⁇ V1 to the fifth predetermined increase amount ⁇ V5 may be variable according to the material and emissivity of the article to be heated 10. Thereby, appropriate temperature control can be performed.
- the standby mode is a mode for maintaining the temperature at the completion of preheating, but the temperature maintained in the standby mode is set to a predetermined moderate temperature lower than the temperature at the completion of preheating. Also good.
- the second predetermined increase amount ⁇ V2 may be set in a range equal to or less than the first predetermined increase amount ⁇ V1.
- the second heating output after completion of preheating may be reduced to, for example, about 500 W.
- the temperature may not return to the temperature at the completion of preheating (for example, 180 ° C. to 200 ° C.).
- the second heating output may be set as appropriate.
- the fourth predetermined increase amount ⁇ V4 is set to be larger than the second predetermined increase amount ⁇ V2.
- the fourth predetermined increase amount ⁇ V4 is set to be larger than the second predetermined increase amount ⁇ V2
- the notification unit 13 may be a speaker that outputs a voice guide, an LED, a liquid crystal, or the like.
- the infrared sensor 3 outputs the infrared detection signal 35 when the temperature is about 250 ° C. or higher, but this value is not limited to about 250 ° C.
- the temperature may be lower or higher than 250 ° C.
- the output of the infrared detection signal 35 is preferably started at a temperature in the range of 240 ° C. to 260 ° C.
- a quantum type infrared sensor may be used as the infrared sensor 3 by using another type of photodiode or phototransistor as a light receiving element of the infrared sensor 3.
- Embodiment 2 demonstrates the case where 1st predetermined increase amount (DELTA) V1 is set according to the material of the to-be-heated material 10.
- DELTA 1st predetermined increase amount
- FIG. 1st predetermined increase amount (DELTA) V1 is set according to the material of the to-be-heated material 10.
- the material of the cooking container is a glossy metal cooking container such as aluminum
- the infrared radiation emissivity is extremely low, so even if the temperature of the object to be heated 10 rises, the output increase ⁇ V of the infrared sensor is immediate. Does not rise. Therefore, in the present embodiment, even when the object to be heated 10 is a metal pan, the first predetermined increase amount ⁇ V1 is set depending on whether the material of the cooking container is aluminum so that the preheating can be completed more accurately. Set.
- FIG. 11 shows the configuration of the induction heating cooker according to the second embodiment of the present invention.
- the induction heating cooker of the present embodiment further includes a heating coil current detection unit 15 that detects the magnitude of a current flowing through the heating coil 2 (referred to as “heating coil current”).
- the heating coil current detector 15 is a current transformer, and is magnetically coupled to the heating coil 2 to monitor the heating coil current.
- the control unit 8 compares the magnitude of the input current detected by the input current detection unit 9 with the magnitude of the heating coil current detected by the heating coil current detection unit 15, and sets the ratio between the two. Based on this, it further has a material determination unit 83 for determining the material of the cooking container.
- FIG. 12 shows a flowchart for setting the first predetermined increase amount ⁇ V1.
- the flow shown in FIG. 12 is performed before step S704 in the preheating mode flow shown in FIG.
- the input current detection unit 9 detects the magnitude of the input current flowing from the commercial power source 5 to the rectifying and smoothing unit 6, and the heating coil current detection unit 15 detects the heating coil 2 when the switching element 73 is conductive.
- the magnitude of the heating coil current which is the resonance current flowing through the heating capacitor 2 and the resonance capacitor 71 flowing when the switching element 73 is turned off.
- the material determination unit 83 compares the detected magnitude of the input current and the magnitude of the heating coil current to identify the material of the cooking container (S1201). Specifically, it is specified whether the material of the cooking container is aluminum or another material.
- the heating coil current value is larger when the cooking vessel made of aluminum is heated than when other metal materials such as iron and stainless steel are heated. Therefore, it can be specified from the detected input current and the heating coil current whether the material of the cooking container is aluminum.
- the heating control unit 81 determines whether the material of the cooking container specified by the material determination unit 83 is aluminum (S1202). If it is aluminum, the first predetermined increase amount ⁇ V1 is set to the increase amount ⁇ (S1203). If it is not aluminum, the first predetermined increase amount ⁇ V1 is set to the increase amount ⁇ (S1204).
- the first predetermined increase amount ⁇ V1 set in this way is used in step 704 of FIG. 7 and compared with the output increase amount ⁇ V of the infrared sensor 3.
- the material of the cooking container is aluminum
- the emissivity of infrared rays is smaller than that of other metal materials such as iron, and the temperature at the same radiation amount is higher than that of other metal materials. . Therefore, if the first predetermined increase amount ⁇ V1 is kept constant, the cooking container may be heated excessively when the material of the cooking container is aluminum. Therefore, in the present embodiment, the material of the cooking container is determined, and when the determined material is aluminum, the first predetermined increase amount ⁇ V1 is set smaller than when the other metal material such as iron is used. Thereby, even if a cooking container is the case of aluminum, it can prevent heating too much and can prevent the excessive temperature rise of a cooking container. That is, as shown in FIG.
- the preheating is completed based on the integrated value of the input power after starting the preheating so that the preheating can be completed accurately. (Yes in S705), it is safe, but the first predetermined increment ⁇ V1 is made of a material having a high emissivity depending on the material of the cooking container as in this embodiment. By setting the first predetermined increase amount ⁇ V1 lower than the case, the preheating mode can be completed with higher accuracy, and safer and more efficient heating can be achieved.
- the temperature of the bottom surface of the cooking container is detected accurately and instantaneously, and the heating power is instantaneously limited when the temperature of the bottom surface reaches a predetermined temperature.
- the temperature can be maintained, and safety can be improved and efficient heating can be realized.
- the temperature can be controlled according to the material, and when the bottom surface temperature reaches a predetermined temperature, the heating power is limited to keep the temperature Improved performance and safety and efficient heating.
- the first predetermined increase amount ⁇ V1 is changed depending on whether it is aluminum (for example, aluminum or iron).
- aluminum for example, aluminum or iron
- other materials similarly have a low emissivity corresponding to the emissivity of the material.
- a similar effect can be obtained by changing the first predetermined increase amount ⁇ V1 so that the material having a higher emissivity is smaller than the material.
- increments ⁇ and ⁇ set as the first predetermined increment ⁇ V1 may be variable. Therefore, even when the material of the cooking container to be heated and the warping amount of the bottom surface of the cooking container are unexpected, appropriate temperature control can be performed, and improvement of safety and efficient heating can be realized.
- FIG. 13 shows an induction heating cooker provided with a buoyancy reduction plate that reduces buoyancy acting on a cooking vessel.
- the induction cooking device shown in FIG. 13 has a buoyancy reduction plate 16 provided between the top plate 1 and the heating coil 2 and a first temperature for detecting the temperature of the buoyancy reduction plate 16 in addition to the configuration of FIG.
- a detector 18 for example, a thermistor.
- a plate made of an electric conductor such as the like is provided between the top plate 1 and the heating coil 2.
- the buoyancy reduction plate 16 is formed in an annular shape when viewed from above and is provided so as to cover the heating coil 2, and increases the equivalent series resistance of the heating coil 2, thereby heating necessary to obtain a desired heating output.
- the electric current of the coil 2 can be reduced and the buoyancy applied to the cooking container can be reduced.
- the buoyancy reduction plate 16 may be divided and arranged. When the buoyancy reduction plate 16 is provided between the top plate 1 and the heating coil 2, the buoyancy reduction plate 16 becomes high temperature due to heating by the heating coil 2. In this case, infrared rays radiated from the buoyancy reduction plate 16 are reflected inside the top plate 1 and enter the infrared sensor 3, or the top plate 1 becomes hot and infrared rays from the top plate 1 enter the infrared sensor 3. .
- the first predetermined increase amount ⁇ V1 is varied based on whether the buoyancy reduction plate 16 is at a high temperature equal to or higher than a predetermined temperature (for example, 350 ° C. or higher).
- FIG. 14 shows a setting operation of the first predetermined increase amount ⁇ V1 in the induction heating cooker of FIG.
- steps S1401, S1402, and S1406 are the same as S1201, S1202, and S1204 in FIG.
- the controller 8 determines that the temperature of the buoyancy reduction plate 16 detected by the first temperature detector 18 is a predetermined temperature (eg, 350 ° C.). It is determined whether or not the above is true (S1403). If the temperature is equal to or higher than the predetermined temperature, it is determined that the buoyancy reduction plate 16 is at a high temperature, and the first predetermined increase amount ⁇ V1 is set to the increase amount ⁇ 1 (S1404). If the temperature is not higher than the predetermined temperature, it is determined that the buoyancy reduction plate 16 is not at a high temperature, and the first predetermined increase amount ⁇ V1 is set to the increase amount ⁇ 2. Here, ⁇ 1 ⁇ 2.
- a predetermined temperature eg, 350 ° C.
- the first predetermined increase amount ⁇ V1 is made smaller than when the buoyancy reduction plate 16 is lower than the predetermined temperature. Even when the temperature rise tendency of the bottom of the cooking container is influenced, it is possible to correctly detect the temperature rise of the bottom of the cooking container and prevent the temperature of the cooking container from rising excessively, thereby improving safety. .
- the bottom surface of the cooking container may be warped inward (concave warpage).
- the infrared sensor 3 cannot correctly detect the bottom surface temperature of the cooking container. Therefore, the first predetermined increase amount ⁇ V1 may be varied based on whether the bottom surface of the cooking container is warped.
- a second temperature detection unit 17 (for example, a thermistor) that detects the temperature of the top plate 1 is further provided.
- the second temperature detection unit 17 is disposed at a position corresponding to the central portion of the heating coil 2 and detects the temperature of the top plate 1. Also in this case, the induction heating cooker operates according to the flow of FIG.
- the control unit 8 uses the temperature of the top plate 1 detected by the first temperature detection unit 18 and the buoyancy reduction plate detected by the second temperature detection unit 17. Whether the bottom surface of the aluminum cooking vessel is warped by determining whether the temperature difference from 16 is equal to or lower than a predetermined temperature (for example, 50 ° C.) after a predetermined time (for example, 10 seconds) from the start of heating. Judge whether. If the temperature difference is equal to or less than the predetermined temperature, it is determined that the bottom surface of the cooking container is warped, and the first predetermined increase amount ⁇ V1 is set to the increase amount ⁇ 1 (S1404).
- a predetermined temperature for example, 50 ° C.
- a predetermined time for example, 10 seconds
- the first predetermined increase amount ⁇ V1 is set to the increase amount ⁇ 2 (S1405).
- ⁇ 1 ⁇ 2 ⁇ the increase amount ⁇ 1 ⁇ 2 ⁇ .
- the buoyancy reduction plate is inductively heated due to the warp of the bottom surface of the aluminum cooking container and becomes high temperature, and even when the infrared sensor 3 cannot correctly detect the temperature of the bottom surface of the cooking container.
- the first predetermined increase amount ⁇ V1 depending on the presence or absence, it is possible to correctly detect that the temperature of the bottom surface of the cooking container has reached the predetermined temperature. Therefore, an excessive temperature rise of the cooking container can be prevented, cooking performance can be improved, and safe and efficient heating can be performed.
- a cooking container with good thermal conductivity and poor thermal efficiency, such as aluminum heat escapes, so the cooking container temperature relative to the input integrated value is lower than other materials. Therefore, it is preferable to set the predetermined power integrated value in the case of aluminum larger than the predetermined power integrated value in the case of other than aluminum (that is, when the predetermined power integrated value P1 in the case of aluminum> non-aluminum.
- a predetermined integrated power value P2 Thereby, even when a cooking container having an extremely low emissivity is heated, appropriate temperature control can be performed, and high-precision temperature control can be realized even when the input power is large or small depending on the material of the cooking container.
- predetermined electric power integrated value P1, P2 variable Thereby, even when the magnitude of the input power depending on the material of the cooking container is unexpected, appropriate temperature control can be realized, and efficient heating can be realized.
- the heating coil current detection unit 15 only needs to be able to detect the magnitude of the heating coil current. For example, a voltage or current proportional to the magnitude of the heating coil current, such as the voltage of the resonance capacitor 71, the voltage or current of the switching element 73, or the like. Anything that can be detected is acceptable.
- the input current detection unit 9 is a current transformer in the first and second embodiments, but is not limited to this. For example, a shunt resistor having a small resistance of, for example, 0.1 to 10 milli ⁇ is connected to the input current path. Then, the magnitude of the input current may be measured by the voltage drop.
- the material determination part 83 is not limited to the said structure, What is necessary is just what can determine the material of a cooking container.
- the induction heating cooker of the present embodiment cooking is not affected by the difference in infrared emissivity depending on the material of the cooking container, the temperature of the buoyancy reduction plate at the start of heating, and the warping of the bottom of the cooking container.
- the induction heating cooker of this embodiment is useful for uses such as an induction heating cooker used for a general household kitchen or business use.
- Embodiment 3 an induction heating cooker capable of heating without causing a defect in the cooking container will be described. If the cooking container is continuously heated for a long time, discoloration or deterioration (for example, deterioration of the coated fluororesin) occurs. Therefore, in Embodiment 3, heating is stopped when the switch operation is not performed for a long time, such as when the user does not cook or forgets to turn off the switch. Specifically, in the standby mode, heating is stopped when a predetermined time elapses without the user operating the switch. This prevents discoloration and damage to the cooking container.
- FIG. 15 shows a configuration of an induction heating cooker according to the third embodiment of the present invention.
- the induction heating cooker of the present embodiment includes a timer count unit 20 in addition to the configuration of FIG.
- the timer count unit 20 measures the time after starting the operation in the standby mode (referred to as “timer time”). When the timer time reaches the first predetermined time, the timer count unit 20 notifies the control unit 8 of the heating stop signal. Send.
- FIG. 16 shows an operation in the standby mode in the induction heating cooker of the present embodiment.
- the timer count unit 20 starts counting the timer time when the preheat mode is shifted to the standby mode (S1601). At this time, a time until the heating is stopped (first predetermined time-timer time) is displayed on the timer display unit 12c.
- the control unit 8 determines whether or not the heating power setting switches 4c and 4d are operated (S1602). When the thermal power setting switches 4c and 4d are operated (Yes in S1602), the count of the timer count unit 20 is stopped (S1603). Thereafter, the standby mode is terminated and the mode is changed to the heating mode.
- the control unit 8 determines whether or not the timer time measured by the timer count unit 20 has passed a first predetermined time (for example, 5 minutes). Judgment is made (S1604). When the timer time has passed the first predetermined time, the control unit 8 causes the notification unit 13 to output a sound notifying that heating is to be stopped (S1605). For example, the voice “Stop heating” is output. Thereafter, the control unit 8 stops heating (S1606). If the first predetermined time (for example, 5 minutes) has not elapsed, it is determined whether a second predetermined time (for example, 3 minutes) shorter than the first predetermined time has elapsed (S1607). .
- a first predetermined time for example, 5 minutes
- the notification unit 13 is made to output a sound that prompts the user to cook. For example, a voice “Please start cooking” is output. If the timer time has not passed the second predetermined time, the process returns to step S1602.
- the user can be prompted to start cooking by adding ingredients before stopping the heating. Therefore, usability is improved for the user. Further, when the heating is stopped, a sound notifying that the heating is stopped is output, so that the user can be notified that the heating is stopped.
- the remaining time until the heating is automatically stopped is displayed by the timer display unit 12c, so that the remaining time until the end of the heating can be visually and easily shown to the user. . Thereby, a user can be encouraged to cook.
- the heating is stopped in step S1606.
- the heating output may be switched to a heating output smaller than the previous heating output. Even in this case, the same effect as the present embodiment can be obtained.
- the step S1602 describes the case where the thermal power setting switches 4c and 4d are pressed.
- any switch other than the thermal power setting switches 4c and 4d may be used.
- the timer switches 4e and 4f are pressed in S1602, the same operation as that of the present embodiment may be performed.
- the output of the sound prompting the start of cooking in S1608 may be performed only once after the second predetermined time elapses, or may be performed at a predetermined interval (for example, every 30 seconds).
- the timer time count value is reset and counting is started again.
- the heating may be stopped when a third predetermined time (for example, 10 minutes) that is longer than the first predetermined time (for example, 5 minutes) is reached.
- the operation in the standby mode has been described.
- the heating output is made smaller than the heating output up to that point or the heating is performed. May be stopped.
- the timer count unit 20 measures the time after the transition to the heating mode, and the measured time elapses between step S901 and step S902 in FIG. 9 for a fourth predetermined time (for example, 45 minutes).
- the heating output may be made smaller than the heating output so far or the heating may be stopped. Thereby, discoloration and deterioration (for example, deterioration of the coated fluororesin) of a to-be-heated material can be prevented.
- the first predetermined time in the standby mode is preferably set shorter than the fourth predetermined time in the heating mode.
- the induction heating cooker of the present embodiment when the user does not operate after completion of preheating, heating is stopped before discoloration or damage is generated in the cooking container, and heating is performed without causing any defects in the cooking container. Therefore, it is useful for applications such as an induction heating cooker used for a general household kitchen or business use.
- the induction heating cooker of the present invention can complete preheating and maintain the temperature after completion of preheating in a short time when the load is small, it can be used in ordinary households and restaurants where fried foods are cooked. It is useful for the induction heating cooker used.
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Abstract
Description
2 加熱コイル
2a 外コイル
2b 内コイル
3 赤外線センサ
4 操作部
4a~4f スイッチ
5 商用電源
6 整流平滑部
7 インバータ回路
8 制御部
9 入力電流検出部
10 被加熱物
11 加熱部
12 表示部
12a 動作モード表示部
12b 火力表示部
12c タイマー表示部
13 報知部
14 光源
15 加熱コイル電流検出部
20 タイマーカウント部
31 フォトダイオード
32 オペアンプ
61 全波整流器
62 チョークコイル
63 平滑コンデンサ
71 共振コンデンサ
72 ダイオード
73 スイッチング素子
81 加熱制御部
82 入力電力積算部
83 材質判定部
1.1 誘導加熱調理器の構成
図1に、本発明の実施形態1の誘導加熱調理器の構成を示す。本実施形態の誘導加熱調理器は、炒め物などの高火力での加熱の前に目標温度に達するまで予熱を行う「予熱機能」を備えている。本実施形態の誘導加熱調理器は、熱応答性の良い赤外線センサ3による被加熱物10の温度に対応した出力信号を用いることによって、予熱時及び加熱時における制御を行う。この誘導加熱調理器は、例えば、キッチンなどのキャビネットに組み込んで使用される。
上記のように構成される本実施形態の誘導加熱調理器の制御部8の動作について、以下に説明する。図5に、本実施形態の誘導加熱調理器の概略の動作を示す。使用者は、誘導加熱調理器の電源を投入すると、メニュースイッチ4bを操作して、「予熱加熱モード」、「加熱モード」、「揚げ物モード」、「湯沸かしモード」及び「炊飯モード」の中から動作モードを一つ選択し、次に切/入スイッチ4aを操作して、選択した動作モードを決定する。制御部8は、このようにして使用者により決定された動作モードを操作部4を介して入力する(S501)。制御部8は、使用者が決定した動作モードが予熱加熱モードかどうかを判断する(S502)。予熱加熱モードであれば(S502でYes)、制御部8は、予熱モードで動作を開始する(S503)。予熱モードでは、調理容器の温度が所定の目標温度(予熱温度)に達するように制御される。制御部8は、調理容器の温度が所定の目標温度に達して予熱モードが完了すると、待機モードでの動作を開始する(S504)。待機モードでは、予熱完了時の被加熱物10の温度が、使用者により火力設定が行われるまでの間、維持するように制御される。待機モード中に、使用者により火力設定が行われると、制御部8は、加熱モードでの動作を開始する(S505)。加熱モードでは、使用者により設定された火力に基づいて、インバータ回路7が制御される。使用者が決定した動作モードが予熱加熱モードでなければ(S502でNo)、制御部8は、使用者が決定した動作モードが加熱モードかどうかを判断する(S506)。使用者が決定した動作モードが加熱モードであれば(S506でYes)、制御部8は、予熱モード及び待機モードを経由せず、加熱モードでの動作を開始する(S505)。使用者により決定された動作モードが加熱モードでなければ(S506でNo)、制御部8は、使用者により選択・決定された他の動作モードに基づいて動作する(S507)。例えば、選択決定された動作モードが揚げ物モードであれば、揚げ物モードでの動作を開始する。本実施形態では、「予熱加熱モード」に特徴があるため、それ以外の動作モードについては、以下の説明において詳細を省略する。
本実施形態の誘導加熱調理器によれば、熱応答性の良い赤外線センサ3によって、被加熱物10の温度を検出しているため、被加熱物10の実際の温度を正確に検出することができる。例えば、調理容器の底面が反っていたり、調理容器の底面の厚みが薄い場合であっても、被加熱物10の実際の温度を、時間的な遅れが発生することなく、正確に検出することができる。よって、高火力(第1の加熱出力、例えば3kW)で予熱を開始しても、被加熱物10の温度が目標温度をはるかに超えることはなく、被加熱物10の温度が目標温度に達したことを赤外線センサ3によりすぐに検知できる。そのため、高火力で予熱を開始することができる。よって、短時間で目標温度に達する。そのため、少量油で且つ高火力で調理を開始するような炒め物調理時であっても、加熱前の予熱を短時間で完了させることができる。
なお、外乱光による赤外線センサ3への影響度が、光フィルタや光遮蔽構造の改善または追加により、十分抑制できる場合には、第1の加熱出力で加熱を開始してからの赤外線センサ3の出力値の増加量ΔVに代え、所定の初期出力値に対する赤外線センサ3の出力値の増加量に基づいて、待機モードに移行してもよい。所定の初期出力値は、例えば、調理容器10の底面温度の変化に対する赤外線センサ3の出力増加の勾配が略ゼロまたは所定値以下となる低温度(例えば35℃以下)の調理容器10をトッププレート1上に載置し赤外線センサ3を覆うようにして予め測定して記憶しておいた赤外線センサ3の出力値(所定の初期出力値)に対する赤外線センサ3の出力値の増加量ΔVとしてもよい。すなわち、当該所定の初期出力値は、調理容器10の温度変化に対する赤外線センサ3の出力増加の勾配が所定値以下となるような低温度にした調理容器10をトッププレート1上に載置した場合に得られる赤外線センサ3の出力値と同程度の値とすればよい。他の例としては、調理容器10を他の同等の放射率の物体にしたり、赤外線センサ3に可視光が入光しないようにしたりして、赤外線センサの出力値を測定することができる。赤外線センサ3の受光量に対応する出力がなされない状況下で得られる赤外線センサ3の出力値とすればよい。この場合には、第1の所定増加量ΔV1~第5の所定増加量ΔV5は、上記所定の初期出力値に対する赤外線センサ3の出力値の増加量ΔVを示す。制御部8は所定の初期出力値を、制御部8が備えた記憶部(図示せず)に記憶し、赤外線センサ3の出力値と所定の初期出力値の差を演算することにより、簡便に赤外線センサ3の出力値の増加量ΔVを算出することができる。
実施形態2では、第1の所定増加量ΔV1を被加熱物10の材質に応じて、設定する場合について説明する。調理容器の材質がアルミのような光沢のある金属の調理容器である場合、赤外線の放射率が極めて低いため、被加熱物10の温度が上昇しても、赤外線センサの出力増加量ΔVはすぐに上昇しない。そこで、本実施形態においては、被加熱物10が金属鍋であった場合でも、予熱の完了がより正確に行えるように、調理容器の材質がアルミかどうかによって、第1の所定増加量ΔV1を設定する。
図11に、本発明の実施形態2の誘導加熱調理器の構成を示す。本実施形態の誘導加熱調理器は、図1の構成に加え、加熱コイル2に流れる電流(「加熱コイル電流」と呼ぶ。)の大きさを検出する加熱コイル電流検出部15をさらに有する。加熱コイル電流検出部15は、カレントトランスであり、加熱コイル2と磁気結合して加熱コイル電流をモニターする。また、本実施形態において、制御部8は、入力電流検出部9により検出された入力電流の大きさと加熱コイル電流検出部15により検出された加熱コイル電流の大きさを比較し、両者の比率に基づいて、調理容器の材質を判定する材質判定部83をさらに有する。
図12に、第1の所定増加量ΔV1の設定のフローチャートを示す。図12に示すフローは、図7に示す予熱モードのフローにおいて、ステップS704の前までに行われる。予熱モードが開始されると、入力電流検出部9は商用電源5から整流平滑部6に流れる入力電流の大きさを検出し、加熱コイル電流検出部15は、スイッチング素子73が導通時に加熱コイル2に流れる加熱コイル電流と、スイッチング素子73がオフしたときに流れる共振コンデンサ71と加熱コイル2に流れる共振電流である加熱コイル電流の大きさと、を検出する。材質判定部83は、検出された入力電流の大きさと加熱コイル電流の大きさを比較して、調理容器の材質を特定する(S1201)。具体的には、調理容器の材質がアルミであるか又は他の材質であるかを特定する。
調理容器の材質がアルミの場合、赤外線の放射率が鉄などの他の金属材質の場合と比較して小さく、同じ放射量のときの温度が他の金属材質の場合と比較して、高い。よって、第1の所定増加量ΔV1を一定にしておくと、調理容器の材質がアルミの場合に、過度に加熱してしまう場合がある。よって、本実施形態では、調理容器の材質を判定して、判定した材質がアルミの場合に、鉄などの他の金属材質のときよりも第1の所定増加量ΔV1を小さくしておく。これにより調理容器がアルミの場合であっても、過度に加熱することを防ぎ、調理容器の過度な温度上昇を防止することができる。すなわち、図7に示すように、被加熱物10が金属鍋であった場合でも、予熱の完了が正確に行えるように、予熱を開始してからの入力電力の積算値に基づいて予熱を完了させているため(S705でYes)、安全であるが、本実施形態のように第1の所定増加量ΔV1を調理容器の材質によって、放射率が高い材質の場合には放射率が低い材質の場合よりも第1の所定増加量ΔV1を低く設定することによって、より高い精度で予熱モードを完了することができ、より安全で効率的な加熱ができる。本実施形態によれば、調理容器の材質がアルミの場合であっても、精度良くかつ瞬時に調理容器底面の温度を検知し、底面の温度が所定の温度に到達したら瞬時に火力を制限して温度を保ち、安全性の向上と効率的な加熱を実現することができる。このように、調理容器の材質によって底面の温度上昇傾向が異なる場合でも、材質に合わせて温度制御することができ、底面の温度が所定の温度に到達したら火力を制限して温度を保ち、調理性能および安全性の向上と効率的な加熱を実現できる。
図13に、調理容器に対して働く浮力を低減する浮力低減板を備えた誘導加熱調理器を示す。図13に示す誘導加熱調理器は、図11の構成に加え、トッププレート1と加熱コイル2との間に設けられた浮力低減板16と、浮力低減板16の温度を検出する第1の温度検出部18(例えば、サーミスタ)とを備える。調理容器の材質がアルミの場合、浮力が発生するため、図13に示すように、調理容器に対して働く浮力を低減する浮力低減板16(例えば、厚みが0.5~1.5mmのアルミなどの電気導体製の板)がトッププレート1と加熱コイル2との間に備えられる場合がある。浮力低減板16は、上方から見て円環状に形成され加熱コイル2を覆うように設けられて、加熱コイル2の等価直列抵抗を増加させることにより、所望の加熱出力を得るために必要な加熱コイル2の電流を減少させ、調理容器にかかる浮力を低減させることができる。なお、浮力低減板16は、分割して配列される場合もある。浮力低減板16がトッププレート1と加熱コイル2との間に設けられている場合、加熱コイル2による加熱によって浮力低減板16が高温になる。この場合、浮力低減板16から放射する赤外線がトッププレート1内を反射して赤外線センサ3に入射したり、トッププレート1が高温になりトッププレート1からの赤外線が赤外線センサ3に入射したりする。すなわち、赤外線センサ3は浮力低減板16の高温の温度を検知するため、調理容器の底面温度を正しく検知できない。そこで、この例では、浮力低減板16が所定温度以上の高温(例えば、350℃以上)かどうかに基づいて、第1の所定増加量ΔV1を異ならせる。図14に、図13の誘導加熱調理器における第1の所定増加量ΔV1の設定動作を示す。図14において、ステップS1401、S1402、ステップS1406はそれぞれ、図12のS1201、S1202、S1204と同一であるため、説明を省略する。図14において、調理容器の材質がアルミであると判断されると(S1402)、制御部8は第1の温度検出部18により検出される浮力低減板16の温度が所定温度(例えば、350℃)以上かどうかを判断する(S1403)。所定温度以上であれば浮力低減板16が高温であると判断し、第1の所定増加量ΔV1を増加量α1に設定する(S1404)。所定温度以上でなければ浮力低減板16が高温でないと判断し、第1の所定増加量ΔV1を増加量α2に設定する。ここで、α1<α2である。浮力低減板16が所定温度以上の高温の場合には、所定温度未満の場合に比べ第1の所定増加量ΔV1を小さくすることにより、加熱開始時の浮力低減板の温度によって、加熱開始後の調理容器底面の温度上昇傾向が左右されるような場合でも、調理容器底面の温度上昇を正しく検知し、調理容器の温度が過度に上昇するのを防止し、安全性の向上を図ることができる。
実施形態3では、調理容器に不具合を発生させずに加熱をすることが可能な誘導加熱調理器について説明する。調理容器を長時間加熱し続けると、変色や劣化(例えば、コーティングされたフッ素樹脂の劣化)が発生する。そのため、実施形態3では、使用者が調理を行わないときやスイッチを切り忘れたときなど、長時間スイッチ操作が行われなかったときに、加熱を停止させる。具体的には、待機モードにおいて、使用者がスイッチを操作せずに、所定時間が経過したときに加熱を停止させる。これにより、調理容器に変色や傷みが発生することを防止する。
Claims (15)
- 赤外線が透過する材料で形成されたトッププレートと、
高周波電流を供給されることによって、前記トッププレート上に載置された調理容器を誘導加熱する加熱コイルと、
前記加熱コイルに高周波電流を供給するインバータ回路と、
前記インバータ回路の動作モードを設定するための動作モード設定部を含む操作部と、
前記調理容器の底面から放射され、前記トッププレートを透過した赤外線を検出する赤外線センサと、
前記操作部に入力された設定と前記赤外線センサの出力とに基づいて、前記インバータ回路の出力を制御する制御部と、
報知部と、
を有し、
前記動作モードは、加熱を行う前に予熱を行う予熱加熱モードを含み、
前記制御部は、動作モードが前記予熱加熱モードに設定されると、前記調理容器を前記予熱加熱モードに対応する第1の加熱出力で加熱する予熱モードで動作を開始し、前記第1の加熱出力で加熱を開始してからの前記赤外線センサの出力値の増加量が第1の所定増加量を超えると、前記報知部に予熱が完了したことを報知させ、且つ前記第1の加熱出力より低い第2の加熱出力で加熱する待機モードに移行する、ことを特徴とする誘導加熱調理器。 - 前記第1の加熱出力で加熱を開始してからの前記赤外線センサの出力値の増加量に代え、所定の初期出力値に対する前記赤外線センサの出力値の増加量が前記第1の所定増加量を超えたときに前記待機モードに移行し、
前記所定の初期出力値は、前記調理容器の温度変化に対する前記赤外線センサの出力増加の勾配が所定値以下となる温度にした前記調理容器を前記トッププレート上に載置した場合に得られる、前記赤外線センサの出力値である、請求項1に記載の誘導加熱調理器。 - 前記待機モードにおいて、前記赤外線センサの出力値の増加量が第2所定増加量以上になると、前記第2の加熱出力より小さい第3の加熱出力で加熱し又は加熱を停止し、前記赤外線センサの出力値の増加量が前記第2所定増加量以下の第3所定増加量未満になると、前記第2の加熱出力で加熱する、請求項1または2に記載の誘導加熱調理器。
- 前記第1の所定増加量は可変である、請求項1または2に記載の誘導加熱調理器。
- 電源から供給される入力電流の大きさを検出する入力電流検出部と、
前記加熱コイルに流れる加熱コイル電流の大きさを検出する加熱コイル電流検出部と、
をさらに有し、
前記制御部は、前記予熱モードの開始時に、検出された前記入力電流の大きさと前記加熱コイル電流の大きさとに基づいて、前記調理容器の材質を判定し、判定した前記調理容器の材質に基づいて、前記第1の所定増加量を設定することを特徴とする、請求項4に記載の誘導加熱調理器。 - 前記トッププレートと前記加熱コイルとの間に配置された浮力低減板と、
前記浮力低減板の温度を検出する温度検出部と、
をさらに有し、
前記制御部は、前記温度検出部により検出される、前記第1の加熱出力で加熱を開始してからの前記浮力低減板の温度に基づいて、前記第1の所定増加量を設定することを特徴とする請求項4に記載の誘導加熱調理器。 - 前記トッププレートと前記加熱コイルとの間に配置された浮力低減板と、
前記浮力低減板の温度を検出する第1の温度検出部と、
前記トッププレートの温度を検出する第2の温度検出部と、
をさらに有し、
前記制御部は、前記第1の温度検出部により検出された温度と前記第2の温度検出部により検出された温度との差に基づいて、前記調理容器の底面が反っているかどうかを判断し、反りの有無によって、前記第1の所定増加量を設定する、請求項4に記載の誘導加熱調理器。 - 前記制御部は、入力電力を積算する入力電力積算部を備え、
前記第1の加熱出力で加熱を開始してからの前記赤外線センサの出力値の増加量が前記第1の所定増加量を超えていない場合、前記入力電力積算部よって積算された、前記第1の加熱出力で加熱を開始してからの入力電力の積算値が所定の電力積算値を超えると、前記報知部に予熱が完了したことを報知させ、且つ前記待機モードに移行する、請求項1または2に記載の誘導加熱調理器。 - 前記所定の電力積算値は可変である、請求項8に記載の誘導加熱調理器。
- 電源から供給される入力電流の大きさを検出する入力電流検出部と、
前記加熱コイルに流れる加熱コイル電流の大きさを検出する加熱コイル電流検出部と、
をさらに有し、
前記制御部は、前記予熱モードの開始時に、検出された前記入力電流の大きさと前記加熱コイル電流の大きさとに基づいて、前記調理容器の材質を判定し、判定した前記調理容器の材質に基づいて、前記所定の電力積算値を設定することを特徴とする、請求項9に記載の誘導加熱調理器。 - 前記操作部は、使用者が前記インバータ回路の火力設定を指示するための火力設定部をさらに備え、
前記待機モード中に、使用者により前記火力設定部を通じて前記火力設定の変更の指示が入力されると、指示された火力に対応する第4の加熱出力で加熱する加熱モードに移行し、
前記加熱モードにおいて、前記赤外線センサの出力値の増加量が、第4の所定増加量を超えると、前記第4の加熱出力より小さい第5の加熱出力で加熱し又は加熱を停止し、
前記赤外線センサの出力値の増加量が、前記第4の所定増加量以下の第5の所定増加量未満になると、前記第4の加熱出力で加熱する、請求項3に記載の誘導加熱調理器。 - 前記第4の加熱出力が前記第2の加熱出力より大きい場合、前記第4の所定増加量は前記第2の所定増加量より大きくする、請求項11に記載の誘導加熱調理器。
- 前記第4の加熱出力が前記第2の加熱出力より小さい場合、前記第4の所定増加量は前記第1の所定増加量と等しくする、請求項11に記載の誘導加熱調理器。
- 前記赤外線センサは、前記加熱コイルの巻線の半径方向の途中に設けられる、請求項1または2に記載の誘導加熱調理器。
- 前記赤外線センサは、シリコンのフォトダイオードを備える、請求項1または2に記載の誘導加熱調理器。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/918,271 US9035223B2 (en) | 2008-02-19 | 2009-02-19 | Induction heat cooking device |
EP09713147.8A EP2247159B1 (en) | 2008-02-19 | 2009-02-19 | Induction heat cooking device |
ES09713147.8T ES2533470T3 (es) | 2008-02-19 | 2009-02-19 | Dispositivo de cocción por inducción de calor |
JP2009554223A JP5313175B2 (ja) | 2008-02-19 | 2009-02-19 | 誘導加熱調理器 |
CN2009801056020A CN101946559B (zh) | 2008-02-19 | 2009-02-19 | 感应加热烹调器 |
HK11102755.8A HK1148896A1 (en) | 2008-02-19 | 2011-03-21 | Induction heat cooking device |
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JP2008-036828 | 2008-02-19 | ||
JP2008036828 | 2008-02-19 | ||
JP2008-061303 | 2008-03-11 | ||
JP2008061303 | 2008-03-11 | ||
JP2008086059 | 2008-03-28 | ||
JP2008-086059 | 2008-03-28 |
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PCT/JP2009/000710 WO2009104403A1 (ja) | 2008-02-19 | 2009-02-19 | 誘導加熱調理器 |
PCT/JP2009/000711 WO2009104404A1 (ja) | 2008-02-19 | 2009-02-19 | 誘導加熱調理器 |
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US (2) | US9035223B2 (ja) |
EP (2) | EP2247158B1 (ja) |
JP (4) | JP5313175B2 (ja) |
CN (2) | CN101946560B (ja) |
ES (2) | ES2533470T3 (ja) |
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CN106231960A (zh) * | 2014-04-17 | 2016-12-14 | 三菱电机株式会社 | 烹调器 |
CN111543121A (zh) * | 2017-12-22 | 2020-08-14 | 三星电子株式会社 | 电磁加热炉及其控制显示的方法 |
CN111543121B (zh) * | 2017-12-22 | 2022-07-19 | 三星电子株式会社 | 电磁加热炉及其控制显示的方法 |
CN110824949A (zh) * | 2019-11-28 | 2020-02-21 | 广东美的厨房电器制造有限公司 | 烹饪设备及其烹饪温度控制方法和存储介质 |
CN110824949B (zh) * | 2019-11-28 | 2022-11-11 | 广东美的厨房电器制造有限公司 | 烹饪设备及其烹饪温度控制方法和存储介质 |
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JP5641488B2 (ja) | 2014-12-17 |
US8796599B2 (en) | 2014-08-05 |
CN101946559B (zh) | 2013-03-20 |
JP5629349B2 (ja) | 2014-11-19 |
JPWO2009104403A1 (ja) | 2011-06-16 |
JP2013152957A (ja) | 2013-08-08 |
US20110000904A1 (en) | 2011-01-06 |
JPWO2009104404A1 (ja) | 2011-06-16 |
JP5313175B2 (ja) | 2013-10-09 |
WO2009104404A1 (ja) | 2009-08-27 |
EP2247159A1 (en) | 2010-11-03 |
US9035223B2 (en) | 2015-05-19 |
ES2533470T3 (es) | 2015-04-10 |
JP5313176B2 (ja) | 2013-10-09 |
EP2247158A1 (en) | 2010-11-03 |
EP2247159A4 (en) | 2011-11-16 |
EP2247158A4 (en) | 2015-03-04 |
HK1147637A1 (en) | 2011-08-12 |
HK1148896A1 (en) | 2011-09-16 |
CN101946560A (zh) | 2011-01-12 |
CN101946559A (zh) | 2011-01-12 |
ES2629443T3 (es) | 2017-08-09 |
EP2247159B1 (en) | 2014-12-24 |
US20110000903A1 (en) | 2011-01-06 |
EP2247158B1 (en) | 2017-03-29 |
JP2013157336A (ja) | 2013-08-15 |
CN101946560B (zh) | 2013-05-22 |
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