WO2010140283A1 - 誘導加熱調理器 - Google Patents
誘導加熱調理器 Download PDFInfo
- Publication number
- WO2010140283A1 WO2010140283A1 PCT/JP2010/001265 JP2010001265W WO2010140283A1 WO 2010140283 A1 WO2010140283 A1 WO 2010140283A1 JP 2010001265 W JP2010001265 W JP 2010001265W WO 2010140283 A1 WO2010140283 A1 WO 2010140283A1
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- WIPO (PCT)
- Prior art keywords
- switching element
- cooking container
- heating coil
- magnetic
- unit
- Prior art date
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- 238000010411 cooking Methods 0.000 title claims abstract description 123
- 230000006698 induction Effects 0.000 title claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 175
- 238000010438 heat treatment Methods 0.000 claims abstract description 165
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 126
- 229910052742 iron Inorganic materials 0.000 claims abstract description 63
- 239000000696 magnetic material Substances 0.000 claims description 40
- 239000003990 capacitor Substances 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 11
- 230000005855 radiation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—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
-
- 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
- H05B2213/05—Heating plates with pan detection means
-
- 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 is used in a kitchen of a general household and performs temperature control of a cooking container using an infrared sensor.
- this type of induction heating cooker has a top plate on which a cooking vessel is placed, a heating coil for induction heating the cooking vessel, an inverter circuit that supplies a high-frequency current to the heating coil, and the amount of radiant energy of the object to be heated. And a temperature detection unit that detects the temperature of the object to be heated and a material determination unit that determines the material of the cooking container placed on the top plate. From the relationship between the input current flowing through the inverter circuit and the heating coil current flowing through the heating coil by the material discrimination unit, the material of the cooking container is selected from aluminum, nonmagnetic stainless steel (hereinafter referred to as nonmagnetic SUS), magnetic stainless steel (hereinafter referred to as SUS), Distinguishes from iron.
- nonmagnetic SUS nonmagnetic stainless steel
- SUS magnetic stainless steel
- the control temperature for controlling the temperature of the cooking container is corrected to be higher than when the identified material is magnetic stainless steel, so that the magnetic SUS and the iron are used.
- the temperature of the cooking container was maintained at a predetermined temperature without any difference (see, for example, Patent Document 1).
- the cooking container is made of magnetic SUS because the material of the cooking container is magnetic SUS and iron and the relationship between the input current and the heating coil current is very similar. It was difficult to distinguish between the case and the case made of iron.
- a magnetic SUS plate provided with a plurality of holes is pressed against the outside of the bottom surface of a non-magnetic cooking container body made of aluminum or the like. Since a non-magnetic material enters the plurality of holes of the magnetic SUS plate, it is difficult to distinguish this type of magnetic SUS from iron. Therefore, in deep-fried food cooking where accuracy of temperature adjustment is required, it is difficult to discriminate between magnetic SUS (including those with pressure welding) and iron, so cooking can be performed at an appropriate temperature only in a cooking container made of a specific material. Had problems.
- the temperature in the cooking container is set to a predetermined value with high accuracy in frying cooking or the like that appropriately discriminates between magnetic SUS and iron and requires accuracy of temperature adjustment.
- An induction heating cooker that can be controlled to a temperature is provided.
- the present invention includes a heating coil that induction-heats a cooking vessel, a resonance capacitor that forms a resonance circuit together with the heating coil, and a switching element, and an inverter circuit that supplies a heating coil current according to the on-time of the switching element to the heating coil And an infrared sensor that detects infrared rays emitted from the bottom surface of the cooking container.
- the present invention includes a first material determining unit that determines the material of the cooking container as a non-magnetic material and a magnetic material, a second material determining unit that determines the material of the cooking container as magnetic SUS and iron,
- the magnitude of the output of the inverter circuit is controlled by changing the ON time of the switching element so that the detected temperature of the infrared sensor becomes a predetermined control temperature, and the first material discriminating unit and the second material discriminating unit are controlled.
- a control unit is provided that sets the control temperature lower than when the material is determined to be iron.
- control unit compares the magnitude of the heating coil current and the on-time of the switching element when the heating output is a predetermined value, so that the on-time of the switching element and the magnitude of the heating coil current are When included in a predetermined region, the material of the cooking container is determined to be iron, and when the on-time of the switching element and the magnitude of the heating coil current are outside the region, the material of the cooking container is determined to be magnetic SUS. .
- the material of the cooking container is a magnetic material, it can be properly distinguished between magnetic SUS and iron, and even when the material is magnetic SUS, the inside of the cooking container can be accurately detected as in the case of iron. It becomes possible to control the temperature to a predetermined temperature.
- FIG. 1 is a block diagram of an induction heating cooker according to Embodiment 1 of the present invention.
- FIG. 2 is a circuit diagram showing the inverter circuit according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram illustrating a first material determination unit according to Embodiment 1 of the present invention.
- FIG. 4 is a diagram for explaining the second material discriminating unit in Embodiment 1 of the present invention.
- FIG. 5 is a diagram for explaining temperature setting values depending on the material of the cooking container in Embodiment 1 of the present invention.
- FIG. 6 is a circuit diagram showing an inverter circuit of the induction heating cooker in the second embodiment of the present invention.
- FIG. 1 is a block diagram of an induction heating cooker according to Embodiment 1 of the present invention.
- FIG. 2 is a circuit diagram showing the inverter circuit according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram illustrating a first material determination unit according to Embodiment
- FIG. 7 is a connection diagram of the inverter circuit of the induction heating cooker according to the third embodiment of the present invention.
- FIG. 8 is a connection diagram of an inverter circuit of the induction heating cooker according to the fourth embodiment of the present invention.
- FIG. 9 is a connection diagram of an inverter circuit of the induction heating cooker according to the fifth embodiment of the present invention.
- the induction heating cooker of this Embodiment is formed of a crystallized ceramic material having heat resistance that transmits light, and a top plate 2 on which a cooking container 1 is placed;
- a heating coil 3 that is provided below and induction-heats the cooking vessel 1 and a resonance capacitor 4 that forms a resonance circuit together with the heating coil 3 are provided.
- the resonance circuit 5 is configured by connecting the heating coil 3 and the resonance capacitor 4 in series.
- the induction heating cooker of the present embodiment includes an inverter circuit 8 including a resonance circuit 5 and a switching element unit 7.
- the switching element unit 7 has a plurality of switching elements (not shown) that are connected in series and are exclusively turned on with a predetermined duty.
- the inverter circuit 8 supplies the heating coil 3 with a heating coil current IL corresponding to the on time of the switching elements constituting the switching element unit 7 (hereinafter simply referred to as the on time of the switching element unit 7).
- the induction heating cooker includes the magnitude of the input current Iin to the inverter circuit 8 detected by the current transformer 16 serving as the input current detection unit, and the heating coil detected by the current transformer 17 serving as the heating coil current detection unit.
- a first material discriminating unit 11 that compares the magnitude of the current IL to discriminate the material of the cooking vessel 1 into a non-magnetic material and a magnetic material is provided.
- the input current Iin may measure the input current of the rectifier 6c, or may measure the current or voltage of a portion proportional to the input current Iin.
- the induction heating cooker of the present embodiment compares the magnitude of the heating coil current IL with the on-time of the switching element unit 7, and the magnitude of the heating coil current IL with respect to the on-time of the switching element unit 7. Is included in the predetermined region, the material of the cooking vessel 1 is determined to be iron, and the material of the cooking vessel 1 is determined if the heating coil current IL is outside the predetermined region with respect to the ON time of the switching element unit 7. Is provided with a second material discriminating unit 12 that discriminates the magnetic material from magnetic SUS.
- the induction heating cooker includes an infrared sensor 9 that detects infrared rays emitted from the bottom surface of the cooking container 1 and transmitted through the top plate 2, and an inverter circuit 8 by outputting a drive signal to the switching element unit 7. Is controlled so that the detected temperature of the infrared sensor 9 becomes a predetermined control temperature, and from the determination results of the first material determination unit 11 and the second material determination unit 12, the material is determined. Is determined to be magnetic SUS, the control unit 10 is set to set the control temperature lower than when the material is determined to be iron.
- FIG. 2 is a circuit diagram of the inverter circuit in the present embodiment.
- a DC power supply 6 includes a rectifier 6c that receives a commercial power supply 18 and performs full-wave rectification, a choke coil 6b that has one end connected to the positive terminal of the rectifier 6c, an output terminal of the choke coil 6b, and a negative electrode of the rectifier 6c. It comprises a smoothing capacitor 6a connected between the terminals, and outputs a pulsating DC voltage to the inverter circuit 8.
- the inverter circuit 8 includes a series circuit including a high-potential side first switching element 7a and a low-potential side second switching element 7b connected in series, and the first switching element 7a and the second switching element.
- Both ends of the series circuit composed of 7b are connected between the DC power sources 6.
- the first switching element 7a and the second switching element 7b constitute the switching element unit 7 of FIG.
- One end of the resonance circuit 5 composed of the heating coil 3 and the resonance capacitor 4 is connected to a connection point 7m between the first switching element 7a and the second switching element 7b.
- the other end of the resonance circuit 5 is connected to the low potential side of the second switching element 7b.
- the other end of the resonance circuit 5 may be connected to the high potential side of the first switching element 7a.
- the control unit 10 makes the first switching element 7a and the second switching element 7b alternately and exclusively conductive at a constant frequency, and sets the ON time and OFF time of the first switching element 7a and the second switching element 7b. By controlling the output based on the ratio, the output is controlled so that the temperature obtained from the infrared sensor 9 becomes a predetermined control temperature.
- the control unit 10 may control the output of the inverter circuit 8 by driving the first switching element 7a and the second switching element 7b at different frequencies instead of a constant frequency.
- the control unit 10 changes the frequency by fixing the ratio between the on time and the off time and the output control based on the ratio between the on time and the off time of the first switching element 7a and the second switching element 7b at a constant frequency. May be combined with the output control performed.
- the first material discriminating unit 11 compares the magnitude of the input current Iin of the inverter circuit 8 and the magnitude of the heating coil current IL to discriminate the material of the cooking vessel 1 from a non-magnetic material and a magnetic material.
- the second material determining unit 12 determines the heating coil current IL and the first switching when the heating output is a predetermined value. If the on-time Ton of the element 7a or the second switching element 7b is included in the predetermined region, the material is determined to be iron, and if not included in the predetermined region, the material is determined to be magnetic SUS.
- the second material discriminating unit 12 discriminates iron when the on-time Ton of the first switching element 7a or the second switching element 7b is smaller than the first predetermined value, and otherwise magnetic SUS. Is determined. Further, as shown by the straight line A in FIG. 4, the first predetermined value can be discriminated more accurately by changing it according to the heating coil current IL. That is, the first predetermined value may be changed in proportion to the heating coil current IL until the on-time Ton of the first switching element 7a or the second switching element 7b reaches the predetermined on-time Ton1.
- the ON time Ton of the first switching element 7a or the second switching element 7b is smaller than the first predetermined value, and the heating coil current IL is smaller than the second predetermined value.
- the second predetermined value can be determined with higher accuracy by changing it according to the on-time Ton of the first switching element 7a or the second switching element 7b. That is, until the heating coil current IL becomes the predetermined heating coil current IL1, the second predetermined value may be changed in proportion to the on-time Ton of the first switching element 7a or the second switching element 7b.
- FIG. 3 is a diagram for explaining the first material discriminating unit in the present embodiment. Since the first material discriminating unit 11 discriminates whether the material of the cooking container 1 is a non-magnetic material or a magnetic material after the heating is started, the magnitude of the input current Iin to the inverter circuit 8 and the magnitude of the heating coil current IL. Compare In the relationship between the input current Iin and the heating coil current IL shown by the dotted line in FIG. 3, the material of the cooking vessel 1 is determined to be a non-magnetic material if a heating coil current IL that is greater than or equal to the predetermined input current Iin is obtained. If the heating coil current IL is less than a predetermined value, the material is determined as a magnetic material.
- the first material determination unit 11 is not limited to the above configuration as long as it can detect at least whether the material of the cooking container 1 is a magnetic material or a non-magnetic material.
- a voltage or current proportional to the magnitude of the heating coil current IL such as the voltage or current of the resonant capacitor 4, the current flowing through the switching elements 7a and 7b, the current flowing through the DC power supply 6, etc. is detected. May be.
- FIG. 4 is a diagram for explaining the second material discriminating unit in the present embodiment.
- determines into iron and magnetic SUS, when the 1st material discrimination
- the resistivity is different between iron and magnetic SUS, and generally the resistivity of iron is smaller. Therefore, when the material of the cooking container 1 is iron, the heating output is likely to be larger than in the case of magnetic SUS, and when the same heating output is obtained, the on-time Ton of the switching element is shorter than in the case of magnetic SUS. Furthermore, if the on-time Ton of the switching element is the same, the heating coil current IL increases.
- a cooking container 1 having a press-contact (high press bonding) configuration as a heated body of the induction heating cooker.
- the cooking container 1 having a press-contact configuration is such that the cooking container 1 body is formed of a nonmagnetic material such as aluminum or copper, and a magnetic SUS plate provided with a plurality of holes is disposed outside the bottom surface portion of the cooking container 1 body. It means what was joined by applying high pressure (the same shall apply hereinafter).
- a protruding portion that protrudes toward the non-magnetic body around each hole of the magnetic SUS plate bites into the main body of the cooking container 1 or a plurality of convex portions provided on the bottom surface portion of the main body of the cooking container 1 Is penetrated through a plurality of holes in the magnetic SUS plate, and the tip of each convex portion is caulked by applying high pressure.
- the cooking container 1 has a press-contact configuration
- a magnetic SUS portion and a non-magnetic material portion such as aluminum coexist on the bottom surface portion, so that the same heating output can be obtained compared to the case of iron. If the on-time Ton of the switching element is the same, the heating coil current IL increases.
- the second material discriminating unit 12 pays attention to such points, and the magnitude of the heating coil current IL and the ON time Ton of the switching element when the heating output of the inverter circuit 8 is a predetermined value (for example, 1500 W) are shown in FIG. If it is included in the predetermined region 1 as shown by the solid line, the material is determined to be iron. That is, in the predetermined region 1, the magnitude of the heating coil current IL is within a predetermined range with respect to the ON time Ton of the predetermined switching element equal to or less than Ton1. When the magnitude of the heating coil current IL and the ON time Ton of the switching element are in the region 2 not included in the region 1, the material is determined as magnetic SUS. Hereinafter, the reason will be described.
- region 1 is divided into region 1a and region 1b, and region 2a is divided into three regions, region 2a, region 2b, and region 2c.
- the material is iron
- a predetermined heating output can be obtained with the on-time Ton of the switching element equal to or shorter than the predetermined on-time Ton1 and smaller than the predetermined heating coil current IL. It is distributed in the range of the region 1a.
- the value of the region 1b is not reached.
- the value of the region 1b is used.
- the non-magnetic material is excluded by the first material discriminating unit 11. Since the second material discriminating unit 12 distinguishes between iron and magnetic SUS in the case of a magnetic material, the region 1a and the region 1b are combined into a region 1.
- the on-time Ton of the switching element is longer than that when the material is iron, and is thus distributed in the region 2a.
- the heating coil current IL for obtaining the same output is increased by the action of a non-magnetic material partially present on the bottom surface, so that the region 2b, the region 2b, and the region 2c in FIG. It is distributed in a region 2c showing intermediate characteristics.
- the region 1a and the region 1b are combined into the region 1, but only the region 1a is used as the region 1 and the other region is used as the region 1b.
- FIG. 5 is a diagram for explaining the set value of the control temperature that is changed depending on the material of the cooking container 1 in the present embodiment. Therefore, when the second material discriminating unit 12 discriminates the material of the cooking container 1 as magnetic SUS, the control unit 10 sets the control temperature when the material is discriminated as iron as shown by a line T2 in FIG. The control temperature is set lower than the line T1 indicating.
- determines the material of the cooking container 1 as magnetic SUS
- the control part 10 transfers to the infrared sensor output correction mode which sets control temperature low
- the bottom surface temperature of the cooking vessel 1 can be controlled to a predetermined temperature with high accuracy as with iron.
- FIG. 6 is a circuit diagram showing an inverter circuit of the induction heating cooker in the present embodiment.
- the DC power supply 6 is shown as an equivalent circuit, but is the same as the DC power supply 6 of FIG. Note that the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only differences are described.
- the inverter circuit 8 includes a third switching element 7c on the high potential side and a fourth switching element 7d on the low potential side connected in series, and the first switching element 7a. And a series circuit connected to both ends of the series circuit composed of the second switching element 7b. Furthermore, the difference from the first embodiment is that the other end of the resonance circuit 5 is connected to a connection point 7n between the third switching element 7c and the fourth switching element 7d. That is, the other end of the resonance circuit 5 is connected to the high potential side of the DC power supply 6 through the third switching element 7c, and is connected to the low potential side of the DC power supply 6 through the fourth switching element 7d. Yes.
- control unit 10 causes the first switching element 7a and the fourth switching element 7d to conduct simultaneously, and the second switching element 7b and the third switching element 7c It is the point which was set as the structure controlled so that these may be made to conduct simultaneously.
- the first and fourth switching elements 7a, 7d and The second and third switching elements 7b and 7c are made to conduct exclusively and alternately, and the output is controlled by the on-time of the first and fourth switching elements 7a and 7d and the second switching elements 7b and 7c. be able to.
- the heating output of the inverter circuit 8 can be increased as compared with the half-bridge configuration in which the third switching element 7c and the fourth switching element 7d are short-circuited as in the first embodiment.
- the temperature in the cooking container 1 is controlled to a predetermined temperature with high accuracy as in the case of iron. It becomes possible to do.
- FIG. 7 shows a circuit diagram of the inverter circuit of the induction heating cooker in the present embodiment.
- the DC power supply 6 is shown as an equivalent circuit, but is the same as the DC power supply 6 of FIG.
- the input terminals of the voltage detection unit 13 are connected to both ends of the resonance capacitor 4 constituting the resonance circuit 5.
- the voltage detector 13 measures the voltage applied to the resonant capacitor 4. There is an electrical proportional relationship between the magnitude of the heating coil current IL and the magnitude of the voltage applied to the resonant capacitor 4.
- determination part 11 will compare the magnitude
- the second material discriminating unit 12 compares the magnitude of the voltage applied to the resonant capacitor 4 with the on-time Ton of the first switching element 7a or the second switching element 7b, and the cooking container discriminated as a magnetic body.
- One material can be further discriminated as magnetic SUS and iron.
- a heating coil voltage detector for measuring the voltage applied to the heating coil 3 is provided, the voltage applied to the heating coil 3 is measured, and the electrical current between the magnitude of the heating coil current IL and the magnitude of the voltage applied to the heating coil 3 is measured. Even if this proportional relationship is used, the magnitude of the heating coil current IL can be measured.
- a switching element current detection unit for measuring the current flowing through the first switching element 7a or the second switching element 7b is provided, and the magnitude of the current flowing through the first switching element 7a or the second switching element 7b is determined.
- the magnitude of the heating coil current IL can also be measured by measuring and utilizing the electrical proportional relationship between the magnitude of the heating coil current IL and the magnitudes of these currents.
- an operation unit 14 is provided for the user to set.
- the operation unit 14 is controlled in the heating output setting unit 14a for setting the heating output in the heating mode and in the temperature control mode.
- the control temperature setting unit 14b for setting the temperature and the control mode selection unit 14c for selecting one control mode from a plurality of control modes including the heating mode and the temperature control mode are provided.
- the difference from the first to third embodiments is that when the control unit 10 heats the cooking container 1 in the heating mode, the determination results of the first material determination unit 11 and the second material determination unit 12 Therefore, when the material is determined to be magnetic SUS, it is prohibited to set the control temperature lower than when the material is determined to be iron.
- the control unit 10 controls the temperature of the cooking container 1 to a control temperature set by the user, and is a temperature control mode (hereinafter also referred to as fried food mode), and the cooking container. 1 with a heating output set by the user.
- the heating mode does not have a control temperature of about 160 ° C. to 200 ° C. as in the deep-fried food mode.
- a temperature overheating prevention temperature for suppressing oil ignition
- it has a control temperature of about 300 ° C. and does not require precise temperature control, so that it is prohibited to shift to the output correction mode of the infrared sensor 9.
- FIG. 8 is a configuration diagram showing a main part of the induction heating cooker in the present embodiment.
- an operation unit 14 is connected to the control unit 10.
- the operation unit 14 includes a heating output setting unit 14a, a control temperature setting unit 14b, and a control mode selection unit 14c.
- the control mode selection unit 14c the user can select and input whether it is a fried food mode or a heating mode.
- the control mode selection unit 14c when the user selects the heating mode with the control mode selection unit 14c, when the material is magnetic SUS, it is prohibited to control the temperature by lowering the control temperature than when the material is iron.
- the control unit 10 operates the first material determination unit 11 and the second material determination unit 12 and corrects the output according to the determination result. Enter mode.
- the state of the cooking container 1 as in the heating mode is determined by discriminating the material of the magnetic cooking container 1 only when cooking that requires high-precision temperature adjustment is performed, such as in the fried food mode. In the case of cooking that often changes greatly, it is possible to prevent the second material determination unit 12 from malfunctioning and unnecessarily degrading the function of preventing overheating.
- control unit 10 causes the second material determination unit 12 to determine after a predetermined time has elapsed since the start of heating. That is, immediately after the control unit 10 shifts to the deep-fried food mode, the values of the on-time Ton and the heating coil current IL are not fixed.
- the second material discriminating unit 12 is moved after a predetermined time (for example, 30 seconds) when the relationship between the on-time Ton and the heating coil current IL is substantially stabilized after shifting to the deep-fried food mode. It is the point which made it the structure which performs discrimination.
- FIG. 9 is a configuration diagram of a main part of the induction heating cooker according to the present embodiment.
- a second material determination unit 12 is connected to the control unit 10 via a delay unit 15.
- the operation unit 14 described in the fourth embodiment is connected to the control unit 10. Therefore, when the user selects the fried food mode in which the temperature in the cooking container 1 is controlled to a predetermined control temperature with high accuracy by the operation unit 14 and starts heating, the control unit 10 sends a count start signal to the delay unit. 15, the delay unit 15 operates the second material determination unit 12 with a predetermined time delay. Thereby, after the relationship between the ON time Ton and the heating coil current IL is substantially stabilized, the second material determination unit 12 determines the material of the cooking container 1. With such a configuration, the material of the cooking container 1 can be determined stably.
- control unit 10 When the user selects the heating mode instead of the deep-fried food mode with the operation unit 14, the control unit 10 does not substantially perform an operation based on the determination result of the second material determination unit 12.
- the second material discriminating unit 12 is discriminated after a predetermined time has elapsed using the delay unit 15, but the second material discriminating unit 12 does not use the delay unit 15. Any method can be used as long as the discrimination operation can be delayed from the start of the heating operation.
- Embodiments 1 to 5 can be used in appropriate combination.
- the present invention includes a heating coil that induction-heats a cooking container, a resonance capacitor that forms a resonance circuit together with the heating coil, and a switching element, and the heating coil according to the on-time of the switching element. And an inverter circuit for supplying current to the heating coil.
- an infrared sensor that detects infrared rays emitted from the bottom surface of the cooking container, a first material determination unit that determines the material of the cooking container as a non-magnetic material and a magnetic material, and the material of the cooking container as magnetic SUS and iron And controlling the magnitude of the output of the inverter circuit by changing the ON time of the switching element to control the temperature detected by the infrared sensor to be a predetermined control temperature. And a control unit that sets the control temperature lower than when the material is determined to be iron when the material is determined to be magnetic SUS from the determination results of the first material determination unit and the second material determination unit.
- the second material discrimination unit compares the magnitude of the heating coil current when the heating output is a predetermined value with the on-time of the switching element, and the magnitude of the heating coil current with respect to the on-time of the switching element.
- the material of the cooking container is determined to be iron, and if the ON time of the switching element and the magnitude of the heating coil current are outside the predetermined region, the material of the cooking container is determined to be magnetic SUS.
- the material of the cooking container is a magnetic material
- the material can be appropriately determined as magnetic SUS and iron, or magnetic SUS and magnetic SUS including magnetic SUS pressed against a non-magnetic material.
- the material of the cooking container is magnetic SUS or magnetic SUS pressed against a non-magnetic material, it is possible to control the temperature in the cooking container to a predetermined temperature with high accuracy as in the case of iron. It becomes.
- the second material determining unit determines that the material of the cooking container is iron when the ON time of the switching element is smaller than the first predetermined value, and the ON time of the switching element is the first.
- the material of the cooking container is determined as magnetic SUS.
- the second material discriminating unit sets the material of the cooking container to iron when the ON time of the switching element is smaller than the first predetermined value and the heating coil current is smaller than the second predetermined value.
- the material of the cooking container is determined as magnetic SUS.
- the inverter circuit includes a series circuit including a first switching element on a high potential side and a second switching element on a low potential side connected in series. Furthermore, one end of the resonant circuit is connected to a connection point between the first switching element and the second switching element, and the other end of the resonant circuit is connected to the low potential side of the second switching element or the high potential of the first switching element.
- the structure connected to the side is provided.
- the control unit exclusively and alternately turns on the first switching element and the second switching element, and controls the output of the inverter circuit according to the ON time of the first switching element and the second switching element. Therefore, the output is controlled so that the temperature obtained from the infrared sensor becomes a predetermined control temperature.
- the second material discriminating unit discriminates that the material is iron when the heating coil current and the ON time of the switching element are included in a predetermined region, and the heating coil current and the ON time of the switching element are in the region. When it is not included, it is configured to discriminate the material from magnetic SUS.
- the material of the cooking container is a magnetic material
- the material can be appropriately determined as magnetic SUS and iron, or magnetic SUS and iron pressed against a non-magnetic material.
- the temperature in the cooking container can be controlled to a predetermined temperature with high accuracy as in the case of iron.
- an inverter circuit includes a series circuit including a first switching element on a high potential side and a second switching element on a low potential side connected in series, and a first circuit on a high potential side connected in series. And a series circuit connected to both ends of a series circuit composed of a first switching element and a second switching element. Furthermore, one end of the resonance circuit is connected to a connection point between the first switching element and the second switching element, and the other end of the resonance circuit is connected to the third switching element and the fourth switching element on the high potential side. A configuration for connecting to a connection point is provided.
- control unit includes a configuration in which the first switching element and the fourth switching element are simultaneously turned on, and the second switching element and the third switching element are simultaneously turned on.
- the heating output of the inverter circuit can be increased as compared with the half-bridge configuration in which the third switching element and the fourth switching element are short-circuited, and the cooking container is made of magnetic SUS or not.
- the temperature in the cooking container can be controlled to a predetermined temperature with high accuracy as in the case of iron.
- the second material discriminating unit determines the magnitude of the heating coil current, the magnitude of the voltage applied to the heating coil or the resonant capacitor, or the current flowing through the first switching element or the second switching element.
- a configuration is provided in which the magnitude of the heating coil current is measured by measuring the magnitude. With this configuration, the second material discrimination unit can discriminate between magnetic SUS and iron when the material of the cooking container is a magnetic material without directly measuring the heating coil current.
- the present invention also provides an operation unit for a user to set a heating output and a control temperature, a heating mode for heating with a heating output set by the operation unit, and a control in which the detection temperature of the infrared sensor is set by the operation unit.
- a control mode selection unit that selects one control mode from among a plurality of control modes including a temperature control mode that controls the temperature. Furthermore, when the control unit selects the heating mode in the control mode selection unit and heats the cooking container, the control unit determines the material as magnetic SUS from the determination results of the first material determination unit and the second material determination unit. In this case, a configuration is provided that prohibits setting the control temperature lower than when the material is determined to be iron.
- the material of the magnetic cooking container is discriminated only when operating in a control mode that requires high-precision temperature adjustment depending on the cooking method, and malfunctions are unnecessary when operating in the heating mode. In addition, it is possible to prevent the cooking performance from being lowered by lowering the control temperature.
- control unit is configured to cause the second material determination unit to perform determination after a predetermined time has elapsed from the start of the heating operation.
- the induction heating cooker according to the present invention can appropriately discriminate the material of the cooking container between the one using magnetic SUS and the one using iron, and the cooking container using magnetic SUS. Even so, it becomes possible to control the temperature of the cooking container to a predetermined temperature with high accuracy using the infrared sensor. Therefore, it is useful for an induction heating cooker that needs to maintain the temperature of an object to be cooked accommodated in a cooking container with high accuracy, such as fried food cooking.
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- Physics & Mathematics (AREA)
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- Induction Heating Cooking Devices (AREA)
Abstract
Description
図1において、本実施の形態の誘導加熱調理器は、光を透過する耐熱性を有する結晶化セラミック材料で形成されてなり調理容器1を載置するための天板2と、天板2の下方に設けられ調理容器1を誘導加熱する加熱コイル3と、加熱コイル3と共に共振回路を構成する共振コンデンサ4を備える。例えば、加熱コイル3と共振コンデンサ4とを直列に接続して共振回路5を構成する。
以下、本発明の実施の形態2における誘導加熱調理器について、図面を参照しながら説明する。図6は本実施の形態における誘導加熱調理器のインバータ回路を示す回路図である。直流電源6は等価回路で示しているが図2の直流電源6と同様である。なお、実施の形態1と同一部分は同じ符号を用いて説明を省略し、相違点についてのみ説明する。
次に本発明の実施の形態3について説明する。実施の形態1と同一部分は同じ符号を用いて説明を省略し、相違点についてのみ説明する。実施の形態1との相違点は、加熱コイル電流ILの大きさを、加熱コイル3と共振回路5を形成する共振コンデンサ4に加わる電圧もしくは電流の大きさ、または第1のスイッチング素子7aもしくは第2のスイッチング素子7bに流れる電流の大きさを測定することにより、調理容器1の材質を判別する構成とした点である。
次に本発明の実施の形態4について説明する。実施の形態1~3と同一部分は同じ符号を用い説明を省略し、相違点についてのみ説明する。実施の形態1~3との相違点は、使用者が設定するための操作部14を備え、操作部14は、加熱モードにおいて加熱出力を設定する加熱出力設定部14aと、温度制御モードにおいて制御温度を設定する制御温度設定部14bと、加熱モードおよび温度制御モードを含む複数の制御モードの中から一つの制御モードを選択するための制御モード選択部14cとを備える点である。また、実施の形態1~3との相違点は、制御部10が、加熱モードで調理容器1を加熱する際には、第1の材質判別部11及び第2の材質判別部12の判定結果から、材質を磁性SUSと判別した場合、材質を鉄と判別したときよりも制御温度を低く設定することを禁止する点である。
次に本発明の実施の形態5について説明する。実施の形態1と同一部分は同じ番号を用い説明を省略し、相違点についてのみ説明する。実施の形態1との相違点は、制御部10は、加熱を開始した時から所定の時間経過後に第2の材質判別部12の判別を行なわせる点である。すなわち、制御部10が、揚げ物モードへ移行直後は、オン時間Tonと加熱コイル電流ILの値が定まっていない。そのため、誤判別を防ぐことを目的として、揚げ物モードへ移行後、オン時間Tonと加熱コイル電流ILの関係がほぼ安定する所定の時間(例えば30秒)経過後に、第2の材質判別部12が判別を行う構成とした点である。
2 天板
3 加熱コイル
4 共振コンデンサ
5 共振回路
6 直流電源
7 スイッチング素子部
7a 第1のスイッチング素子
7b 第2のスイッチング素子
7c 第3のスイッチング素子
7d 第4のスイッチング素子
8 インバータ回路
9 赤外線センサ
10 制御部
11 第1の材質判別部
12 第2の材質判別部
13 電圧検出部
14 操作部
15 遅延部
16 カレントトランス(入力電流検出部)
17 カレントトランス(加熱コイル電流検出部)
18 商用電源
Claims (8)
- 調理容器を誘導加熱する加熱コイル、前記加熱コイルと共に共振回路を構成する共振コンデンサ、およびスイッチング素子を有し、前記加熱コイルに前記スイッチング素子のオン時間に応じた加熱コイル電流を前記加熱コイルに供給するインバータ回路と、
前記調理容器底面から放射される赤外線を検知する赤外線センサと、
前記調理容器の材質を非磁性体と磁性体とに判別する第1の材質判別部と、
前記調理容器の材質を磁性SUSと鉄とに判別する第2の材質判別部と、
前記スイッチング素子のオン時間を変更することにより前記インバータ回路の出力の大きさを制御して、前記赤外線センサの検知温度が所定の制御温度となるように制御するとともに、前記第1の材質判別部及び前記第2の材質判別部の判定結果から、前記材質を磁性SUSと判別した場合、前記材質を鉄と判別したときよりも前記制御温度を低く設定する制御部とを有し、
前記第2の材質判別部は、加熱出力を所定の値とした場合における前記加熱コイル電流の大きさと前記スイッチング素子のオン時間とを比較して、前記スイッチング素子のオン時間と前記加熱コイル電流の大きさとが所定の領域内に含まれると前記調理容器の材質を鉄と判別し、前記スイッチング素子のオン時間と前記加熱コイル電流の大きさとが前記領域外にあると前記調理容器の材質を磁性SUSと判別する誘導加熱調理器。 - 前記第2の材質判別部は、前記スイッチング素子のオン時間が第1の所定値よりも小さい場合に、前記調理容器の材質を鉄と判別し、前記スイッチング素子のオン時間が前記第1の所定値以上である場合に、前記調理容器の材質を磁性SUSと判別する請求項1に記載の誘導加熱調理器。
- 前記加熱コイル電流が第2の所定値よりも小さい場合に、前記調理容器の材質を鉄と判別し、前記加熱コイル電流が前記第2の所定値以上である場合に、前記調理容器の材質を磁性SUSと判別する請求項2に記載の誘導加熱調理器。
- 前記インバータ回路は、直列に接続された高電位側の第1のスイッチング素子および低電位側の第2のスイッチング素子からなる直列回路を備え、前記共振回路の一端が前記第1のスイッチング素子と前記第2のスイッチング素子との接続点に接続され、前記共振回路の他端が前記第2のスイッチング素子の低電位側または前記第1のスイッチング素子の高電位側に接続され、
前記制御部は、前記第1のスイッチング素子および前記第2のスイッチング素子を排他的に交互に導通させ、前記第1のスイッチング素子および前記第2のスイッチング素子のオン時間によって前記インバータ回路の出力を制御することにより、前記赤外線センサの検知温度が前記所定の制御温度となるように出力を制御し、
前記第2の材質判別部は、前記加熱コイル電流と前記スイッチング素子のオン時間とが所定の領域内に含まれる場合は前記材質を鉄と判別し、前記加熱コイル電流と前記スイッチング素子のオン時間とが前記領域に含まれない場合は前記材質を前記磁性SUSと判別する請求項1記載の誘導加熱調理器。 - 前記インバータ回路は、直列に接続された高電位側の第1のスイッチング素子および低電位側の第2のスイッチング素子からなる直列回路と、直列に接続された高電位側の第3のスイッチング素子および低電位側の第4のスイッチング素子からなり前記第1のスイッチング素子および前記第2のスイッチング素子からなる前記直列回路の両端に接続された直列回路と、を備え、前記共振回路の一端が前記第1のスイッチング素子と前記第2のスイッチング素子との接続点に接続され、前記共振回路の他端が、前記第3のスイッチング素子と前記第4のスイッチング素子との接続点に接続され、前記制御部は、前記第1のスイッチング素子および前記第4のスイッチング素子を同時に導通させ、前記第2のスイッチング素子および前記第3のスイッチング素子を同時に導通させる請求項1記載の誘導加熱調理器。
- 前記第2の材質判別部は、前記加熱コイル電流の大きさを、前記加熱コイルもしくは前記共振コンデンサに加わる電圧の大きさ、または前記第1のスイッチング素子もしくは前記第2のスイッチング素子に流れる電流の大きさを測定する請求項1記載の誘導加熱調理器。
- 使用者が加熱出力および前記制御温度を設定するための操作部と、前記操作部で設定された前記加熱出力で加熱する加熱モードおよび前記赤外線センサの検知温度が前記操作部で設定された前記制御温度となるように制御する温度制御モードを含む複数の制御モードの中から一つの制御モードを選択する制御モード選択部と、を備え、前記制御部は、前記制御モード選択部で加熱モードを選択して前記調理容器を加熱する際には、前記第1の材質判別部及び前記第2の材質判別部の判定結果から、前記材質を磁性SUSと判別した場合、前記材質を鉄と判別したときよりも前記制御温度を低く設定することを禁止する請求項1記載の誘導加熱調理器。
- 前記制御部は、加熱動作開始時から所定の時間経過後に前記第2の材質判別部の判別を行なわせる請求項1記載の誘導加熱調理器。
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JP2011518213A JP5454576B2 (ja) | 2009-06-01 | 2010-02-25 | 誘導加熱調理器 |
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