JP2014116123A - Induction heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooker which exhibits the same cooking performance even when materials of cooking containers used in automatic cooking are different from each other.SOLUTION: An induction heating cooker comprises: material detection means 12 for determining a material of a cooking container 2; temperature detection means 8 for detecting a temperature of a bottom of the cooking container 2; an operation part 4 for selecting a cooking menu; and a control part 13 for controlling heating of the cooking container 2 depending on a heat condition corresponding to the selected cooking menu. By making the control part 13 change the heat condition corresponding to the cooking menu depending on the material of the cooking container 2 determined by the material detection means 12, cooking can be performed under an optimum heat condition appropriate to the material of the cooking container 2 used in automatic cooking.

Description

  The present invention relates to an induction heating cooker that induction-heats a cooking container.

  In recent years, induction heating cookers that induction-heat cooking containers such as pans and frying pans with a heating coil have been widely used in general households and commercial kitchens.

  Conventionally, some induction heating cookers of this type can maintain the bottom surface temperature of a cooking container at a predetermined temperature even if the material of the cooking container is different (see, for example, Patent Document 1).

  FIG. 3 shows a conventional induction heating cooker described in the publication. As shown in FIG. 3, a heating coil 63 that generates a high-frequency magnetic field and heats the cooking vessel, an inverter circuit 71 that supplies a high-frequency current to the heating coil 63, and an output that controls the magnitude of the output of the inverter circuit 71 Detected by the control unit 73, the material detection means 72 for detecting the material of the cooking container 62, the temperature detection means 68 for detecting the temperature of the cooking container 62 by the amount of radiant energy of the cooking container 62, and the material detection means 72. Temperature correction means 64 for correcting the detection value of the temperature detection means 68 in accordance with the material of the cooking container 62, and the output control unit 73 responds to the temperature corrected by the temperature correction means 64 in the inverter circuit 71. By controlling the magnitude of the output, the temperature of the cooking vessel 62 is maintained at a predetermined temperature with high accuracy without being affected by the material of the cooking vessel 62. So that it is theft.

Japanese Patent Laying-Open No. 2005-078993

  However, like the induction heating cooker of patent document 1, it comprises temperature correction means for correcting the detection value of the temperature detection means according to the material of the cooking container such as a frying pan or a pan, and the output control unit is configured to correct the temperature. By controlling the magnitude of the output of the inverter circuit according to the correction temperature by the means, the temperature of the cooking container can be maintained at a predetermined temperature with high accuracy without being affected by the material of the cooking container. When heating an object, the heat capacity, the thermal conductivity, etc. differ depending on the material of the cooking container such as a frying pan or a pan, so that the performance when heated in the same time is different. Therefore, when the cooking menu is selected and heating is started, the thermal conductivity of the cooking container used may vary depending on the material of the cooking container used when realizing automatic cooking with a configuration that provides a good finish of the food according to the cooking menu. Due to differences, the amount of heat transmitted to food was different, and as a result, there was a problem that the quality could be different.

  The present invention solves the above-described conventional problems, and when performing automatic cooking of the same cooking menu, even if cooking is performed using different cooking containers, the quality is always good regardless of the material of the cooking container. An object of the present invention is to provide an induction heating cooker from which can be obtained.

A heating coil that generates a high-frequency magnetic field and heats the cooking container, an inverter circuit that supplies a high-frequency current to the heating coil, a material detection means that determines the material of the cooking container, and a temperature of the bottom surface of the cooking container A temperature detection unit; an operation unit that selects a cooking menu; and a control unit that controls heating according to the selected cooking menu, wherein the control unit corresponds to a material of the cooking container determined by the material detection unit. The heating is performed under different heating conditions.

  As a result, optimal heating conditions can be set according to the material of the cooking container such as a pan used in automatic cooking, so that the user is always good even when using a pan with a different material each time automatic cooking is performed. It is possible to cook almost the same quality.

  The induction heating cooker of the present invention can set optimum heating conditions according to the material of a cooking container such as a pan used in automatic cooking. Even if it uses, the induction heating cooking appliance which can perform the cooking of the substantially same quality which is always good can be provided.

The block diagram which shows the structure of the induction heating cooking appliance of Embodiment 1 of this invention. The figure which shows the screen of the portable terminal of Embodiment 1 of this invention Block diagram of a conventional induction heating cooker

  1st invention generates the high frequency magnetic field, the heating coil which heats a cooking vessel, the inverter circuit which supplies a high frequency current to the heating coil, the material detection means which determines the material of the cooking vessel, and the bottom of the cooking vessel Temperature detecting means for detecting the temperature of the cooking device, an operation unit for selecting a cooking menu, and a control unit for controlling heating of the cooking container according to a heating condition corresponding to the selected cooking menu, The heating condition corresponding to the cooking menu is changed according to the material of the cooking container determined by the material detection means.

  As a result, it is possible to change to the optimum heating conditions according to the material of the cooking container used in automatic cooking, so even if the user uses a pan with a different material each time automatic cooking is performed, it is always good almost the same You can cook well.

  In the second invention, in particular, in the first invention, the material detecting means can determine at least whether the material is aluminum or a material other than aluminum.

  This makes it possible to determine whether the cooking container is made of aluminum or other materials, especially by making it possible to determine whether the heat conductivity is higher than other materials, or whether it is a material other than aluminum. Can be reduced.

  In a third aspect of the invention, particularly in the first or second aspect of the invention, there is provided temperature detecting means for detecting the temperature of the bottom surface of the cooking container, and the control unit is set under the heating condition corresponding to the cooking menu. The heating control according to the temperature of the bottom surface of the cooking container is continued according to the control temperature and the heating time, and the heating condition is changed according to the material of the cooking container without changing the heating time. The control temperature is changed.

  As a result, even if the material of the cooking container is different, cooking with substantially the same quality can be performed in the same cooking time by changing the control temperature according to the material.

  According to a fourth aspect of the invention, particularly in the first or second aspect of the invention, there is provided temperature detecting means for detecting the temperature of the bottom surface of the cooking container, and the control unit is set under the heating condition corresponding to the cooking menu. Control of heating according to the temperature of the bottom surface of the cooking vessel is continued according to the control temperature and the heating time, and the heating condition that is changed according to the material of the cooking vessel is changed without changing the control temperature. The heating time is changed.

  Accordingly, even if the material of the cooking container is different, by changing the heating time depending on the material, it is not necessary to change the control temperature depending on the material, and the temperature control configuration is simplified.

  According to a fifth aspect of the invention, particularly in the third or fourth aspect of the invention, the temperature detecting means detects the temperature of the cooking container with the amount of radiant energy on the bottom surface of the cooking container.

  As a result, the amount of energy radiated from the bottom surface of the cooking container can be directly detected. Therefore, even if there is a gap between the top plate and the bottom surface of the cooking container due to deformation of the bottom surface of the cooking container, the temperature of the bottom surface of the cooking container can be accurately measured. It is possible to control the cooking with the same cooking time in the same cooking time depending on the material of the cooking container or the cooking with the cooking time changed at the same control temperature depending on the material of the cooking container with high accuracy. it can.

(Embodiment 1)
FIG. 1 is a block diagram showing 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 the top plate 1 provided on the apparatus upper surface, and the heating coil 3 which induction-heats the cooking container 2 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 3 is provided below the top plate 1. The cooking vessel 2 generates heat due to the eddy current generated by the high frequency magnetic field of the heating coil 3.

  The induction cooking device of the present invention is provided with an operation unit 4 including a plurality of switches at a position that is easy for the user to use. For example, the operation unit 4 includes a heating start / stop switch and a menu selection switch for the user to instruct the start and stop of heating. In addition, the operation unit 4 is provided with a communication device 6 that can communicate with the mobile terminal 5 in a contactless manner. The portable terminal 5 includes a function for sending menu selection and heating condition data by non-contact communication. Further, the portable terminal is configured to be able to communicate with the server 7 wirelessly or by wire. The user can select a menu from a plurality of cooking menus mounted on the operation unit, and can also select a menu from the cooking menus mounted on the portable terminal 5. In addition, the mobile terminal 5 can download new cooking menu data from the server 7 and can add a cooking menu as needed.

  The temperature detection means 8 is composed of an infrared sensor that detects the temperature of the bottom surface of the cooking container 2 by detecting the amount of radiant energy from the bottom surface of the cooking container 2. The temperature detection means 8 is provided in the middle of the cooking container 2 in the radial direction. At this position, since the high-frequency magnetic field of the heating coil 3 is strong, the substantially maximum temperature of the bottom surface of the cooking vessel 2 can be detected. Infrared radiation based on the bottom surface temperature of the cooking container 2 radiated from the bottom surface of the cooking container 2 enters through the top plate 1 and is received by the temperature detection means 8. The temperature detection means 8 detects the received infrared rays, and the pan bottom temperature is calculated based on the detected amount of infrared rays.

  Below the heating coil 3, a rectifying / smoothing unit 10 that converts an AC voltage supplied from the commercial power supply 9 into a DC voltage, a DC voltage supplied from the rectifying / smoothing unit 10 to generate a high-frequency current, and the generated high-frequency current Is provided to the heating coil 3. The rectifying / smoothing unit 10 includes a full-wave rectifier 21 composed of a bridge diode, and a low-pass filter composed of a choke coil 22 and a smoothing capacitor 23 connected between output terminals of the full-wave rectifier 21. The inverter circuit 11 includes a switching element 31 (IGBT in this embodiment), a diode 32 connected in antiparallel with the switching element 91, and a resonance capacitor 33 connected in parallel with the heating coil 3. When the switching element 31 of the inverter circuit 11 is turned on / off, a high frequency current is generated.

  Although the details of the material detection means 12 are not described, stainless steel generally used as a cooking container based on detection results such as the voltage across the resonance capacitor 33 detected from the inverter circuit 11 and the current input to the coil, The material of iron and aluminum is judged. The result of the material detection unit 12 is input to the control unit 13. The thermal conductivities of stainless steel, iron, and aluminum are about 20, 84, and 236 (W / m / K), respectively. It is important to detect the material of aluminum because it has a great influence on the quality of cooking because the thermal conductivity is different from other materials.

  The controller 13 controls the high-frequency current supplied from the inverter circuit 11 to the heating coil 3 by outputting a drive signal for controlling on / off of the switching element 31 of the inverter circuit 11. Based on the menu set in the operation unit 4, the heating conditions such as the control temperature at the time of preheating, the control temperature at the time of cooking, the heating power at the time of preheating, the heating power at the time of cooking, and the cooking time of each material of iron, stainless steel and aluminum are set. It is transmitted to the control unit 13. In the control part 13, based on the result of the material detection means 12, the control temperature at the time of preheating optimal for cooking in the cooking container of each material, the control temperature at the time of cooking, the thermal power at the time of preheating, the thermal power at the time of cooking, The heating conditions such as cooking time are selected so as to be changed depending on the cooking container made of each material, and the control unit 13 controls the on / off of the switching element 31 so as to achieve the target heating output, and further the temperature detecting means 8. On / off of the switching element 31 is controlled and maintained at the selected heating temperature based on the temperature calculated in (1), and the cooked food in the cooking container 2 is heated for the selected heating time.

  For example, when the material of the cooking vessel 2 is iron, the menu has a control temperature of 180 ° C. during cooking and a cooking time of 5 minutes. Because it is overwhelmingly higher than iron, the control temperature during cooking is 170 ° C., which is lower than iron, and the cooking time is changed to 4 minutes 20 seconds, which is shorter than iron. Since the difference in the amount of heat that the food receives from the cooking container 2 can be reduced, the difference in the quality of cooking can be reduced regardless of the material of the cooking container 2.

  Moreover, it can also be set as the structure selected so that a control temperature may be changed among each heating conditions selected so that it may be changed with the material of the cooking container 2, without changing the cooking time. For example, when the material of the cooking vessel 2 is iron, the menu has a control temperature of 180 ° C. during cooking and a cooking time of 5 minutes. Is overwhelmingly higher than iron, so the control temperature during cooking is changed to 165 ° C., which is lower than that of iron, and the cooking time is set to 5 minutes, the same as iron. Thereby, since the difference in the amount of heat received from the cooking container 2 by the difference in the material of the cooking container 2 can be reduced, the difference in the quality of cooking can be reduced regardless of the material of the cooking container 2, Since the cooking time does not change depending on the material, the user does not need to be aware of the difference in cooking time due to the material of the cooking container 2 and can easily cook.

  Moreover, it can also be set as the structure selected so that cooking temperature may be changed among each heating conditions selected so that it may be changed with the material of the cooking container 2, without changing the control temperature. For example, when the material of the cooking vessel 2 is iron, the menu has a control temperature of 180 ° C. during cooking and a cooking time of 5 minutes. Is overwhelmingly higher than iron, the cooking time is changed to 4 minutes shorter than iron, and the control temperature during cooking is set to 180 ° C., the same as iron. Thereby, since the difference in the amount of heat received from the cooking container 2 by the difference in the material of the cooking container 2 can be reduced, the difference in the quality of cooking can be reduced regardless of the material of the cooking container 2, Since the control temperature at the time of cooking does not change depending on the material, the quality of cooking can be made uniform simply by changing the cooking time, and there is no need to change the configuration when the control unit 13 controls the temperature at the control temperature.

  Moreover, in the menu which performs control by constant heating power instead of control by control temperature, cooking is performed without changing the heating power during cooking among the heating conditions selected to be changed according to the material of the cooking container 2. The same effect can be obtained by using a method of changing the time or a method of changing the heating power during cooking without changing the cooking time.

  Next, the operation | movement when setting the menu of the induction heating cooking appliance of this invention using FIG. 1, FIG. 2 is demonstrated.

  The cooking menu can be set from either the operation unit 4 or the portable terminal 5. Here, a method for performing menu setting and cooking using the portable terminal 5 will be described. In FIG. 1, the cooking container 2 is placed almost at the center on the heating coil 3. In FIG. 2, a menu is selected from the menu group 52 displayed on the display screen 51 of the portable terminal 5. When a menu is selected and the portable terminal 5 is brought close to the communication device 6 provided in the operation unit 4, communication is performed in a non-contact manner and cooking menu data is transmitted to the operation unit 4. The data to be transmitted includes the control temperature at the time of preheating, the control temperature at the time of cooking, the heating power at the time of preheating, the heating power at the time of cooking, the cooking time, etc. when the material is aluminum, stainless steel, or iron. When the data transmission to the operation unit 4 is completed, the user is notified of the completion of data reception by a buzzer, a lamp or the like, and also input to the control unit 13. The user operates a heating start switch provided in the operation unit 4 to start preheating. When preheating is started, the material of the cooking container 2 is detected by the material detection means 12 and is input to the control unit 13. The control unit 13 selects a heating condition corresponding to the material detected by the material detection means 12 from the input cooking menu data. When the control unit 13 detects the pan bottom temperature by the temperature detecting means 8 and the control unit 13 detects that the pan bottom temperature of the cooking container 2 has reached the preheating control temperature selected according to the material of the cooking container 2, the inverter circuit 11 is controlled and the control temperature at the time of preheating is maintained, and the user is notified by a buzzer, a lamp, and the like. The user inputs that cooking has started by putting the food into the cooking container 2 and operating the heating start switch again. The control unit 13 controls the inverter circuit 11 so that the pan bottom temperature of the cooking vessel 2 becomes the control temperature during cooking selected according to the material of the cooking vessel 2. The control unit 13 stops heating when the cooking time corresponding to the material detected by the material detection means 12 has elapsed since the cooking item has been added, and notifies the user of the end of cooking using a buzzer, a lamp, or the like. .

  The portable terminal 5 can increase the number of menus that can be automatically cooked by downloading the cooking menu from the server 7 via the Internet or the like. The induction heating cooker of the present invention can detect the material by the material detection means 12, automatically select the heating condition corresponding to the material, and can be heated under the optimum heating condition, so that the user can use the cooking menu newly added. It is possible to increase the cooking repertoire without having to worry about the material.

  In the present invention, an infrared sensor that detects the temperature of the bottom surface of the cooking container 2 by detecting the amount of radiant energy from the bottom surface of the cooking container 2 as the temperature detection means 8 has been described. You may detect the pan bottom temperature of the cooking container 2 through a plate using the temperature sensing element closely_contact | adhered to the lower surface. By using the temperature sensitive element, a simple and inexpensive configuration can be obtained.

  The data transmitted when the cooking menu data is transmitted from the portable terminal 5 to the operation unit 4 is the control temperature at the time of preheating, the control temperature at the time of cooking, the heating power at the time of preheating, and the time of cooking. The data transmitted from the portable terminal 5 to the operation unit 4 is only the heating condition when the material of the cooking container 2 is, for example, iron, and the heating condition when the material other than iron is controlled. If a predetermined condition such as a multiplication rate or addition or decrease value for each material is provided in the unit 13 in advance, and each heating condition is calculated according to the material determined by the material detection means 12, the same applies. An effect can be acquired and the communication data of the portable terminal 5 and the operation part 4 can be reduced.

  Moreover, although the material detection means 12 showed the structure which detects whether the material of the cooking vessel 2 is aluminum, stainless steel, or iron, it is not limited to this.

  Moreover, although the structure using the portable terminal 5 as a cooking menu setting means is shown, it is not limited to this. For example, the cooking menu data is stored in the flash memory, the flash memory reader is provided in the induction heating cooker of the present invention, the cooking menu data is input, the cooking menu is displayed on the display provided in the operation unit 4, and the cooking menu is set. The same effect can be achieved even with the configuration.

  The induction heating cooker of the present invention is useful as a cooking device used in general households and the like because it is equipped with automatic cooking capable of realizing the same cooking quality even in cooking containers of different materials.

DESCRIPTION OF SYMBOLS 2 Cooking container 3 Heating coil 4 Operation part 8 Temperature detection means 11 Inverter circuit 12 Material detection means 13 Control part

Claims (5)

A heating coil that generates a high-frequency magnetic field and heats the cooking container, an inverter circuit that supplies a high-frequency current to the heating coil, a material detection means that determines the material of the cooking container, an operation unit that selects a cooking menu, and a selection A controller that controls heating of the cooking container according to a heating condition corresponding to the cooking menu, and the controller corresponds to the cooking menu according to the material of the cooking container determined by the material detection means. An induction heating cooker configured to change the heating condition. The induction heating cooker according to claim 1, wherein the material detection means is configured to be able to determine at least whether the material is aluminum or a material other than aluminum. Temperature detection means for detecting the temperature of the bottom surface of the cooking container is provided, and the control unit responds to the temperature of the bottom surface of the cooking container according to the control temperature and the heating time set in the heating condition corresponding to the cooking menu. The heating control is continued for the heating time, and the heating temperature changed according to the material of the cooking container is configured to change the control temperature without changing the heating time. Induction heating cooker. Temperature detection means for detecting the temperature of the bottom surface of the cooking container is provided, and the control unit responds to the temperature of the bottom surface of the cooking container according to the control temperature and the heating time set in the heating condition corresponding to the cooking menu. The heating control is continued for the heating time, and the heating condition changed according to the material of the cooking container is configured such that the heating time is changed without changing the control temperature. Induction heating cooker. The induction heating cooker according to claim 3 or 4, wherein the temperature detection means is configured to detect the temperature of the cooking container by the amount of radiant energy of the cooking container.