JP2011108430A - Induction heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set the temperature detected by an infrared sensor to be higher than a set temperature determined by a user, thereby eliminating dangers even when the amount of overshooting increases because of the shape, material and degree of warping of a pan when all kinds of metallic pans, not only an attached tempura pan but also aluminum and copper pans, are used. <P>SOLUTION: This induction heating cooker includes: an infrared sensor 5 which receives an infrared ray radiating from the bottom surface of a cooking container 1 to detect the temperature of the bottom surface of the cooking container 1; and a controller 6 which, if a frying mode is selected by an operation module 7, executes an initial temperature control mode for heating with a predetermined first heating output until the temperature detected by the infrared sensor 5 reaches a first control temperature, and which then enters a stable temperature control mode for controlling the output of an inverter circuit 4 so that the temperature detected is maintained at a second control temperature corresponding to the set temperature. The controller 6 sets the first control temperature to be higher than the second control temperature. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an induction heating cooker used in general homes, restaurants and offices.

  Conventionally, this type of induction heating cooker has temperature detection means using a temperature sensitive element (see, for example, Patent Document 1).

JP 05-062772 A

  However, in the conventional configuration, after heating is started at the maximum heating power, the temperature is controlled by a heating power lower than the maximum heating power, thereby delaying the temperature rise of the oil and improving the temperature tracking of the temperature sensing element. It does not have a function to reach the temperature setting determined by the user in a short time while maintaining the maximum heating power, and the user has a problem that fried food cooking cannot be performed in a short time. It was.

  The present invention solves the above-mentioned conventional problems, and by setting the first control temperature, which is the detection temperature of the infrared sensor, higher than the set temperature determined by the user, it is not limited to the attached tempura pan, but also aluminum or copper. It is an object of the present invention to provide an induction heating cooker that does not pose a danger even when the amount of overshoot due to the shape, material, and warpage of the pan increases when all types of metal pans such as a pan are used.

  In order to solve the above-mentioned conventional problems, the induction cooking device of the present invention is configured to set the first control temperature, which is the detection temperature of the infrared sensor, higher than the set temperature determined by the user.

  Thus, the problem that the oil temperature is stabilized at a temperature higher than the set temperature determined by the user due to the material of the cooking container and the degree of warping during temperature control of the deep-fried food is to be solved.

  The induction heating cooker of the present invention has an infrared sensor that receives infrared rays radiated from the bottom surface of the cooking container and detects the bottom temperature of the cooking container, and the detected temperature of the infrared sensor reaches the first control temperature. Stable temperature control mode for controlling the output of the inverter circuit so that the detected temperature is maintained at the second control temperature corresponding to the set temperature after executing the initial temperature control mode in which heating is performed with a predetermined first heating output until The control means for shifting to the above, and by setting the first control temperature higher than the set temperature, it is possible to eliminate the problem of being stabilized at an oil temperature equal to or higher than the set temperature when a large overshoot occurs. it can.

The block diagram of the induction heating cooking appliance in Embodiment 1 of this invention Operation | movement explanatory drawing of the induction heating cooking appliance in Embodiment 1 of this invention Operation explanatory drawing of the induction heating cooking appliance in Embodiment 2 of this invention Operation | movement explanatory drawing of the induction heating cooking appliance in Embodiment 3 of this invention Operation | movement explanatory drawing of the induction heating cooking appliance in Embodiment 4 of this invention Oil amount determination diagram of induction heating cooker in Embodiment 5 of the present invention Operation explanatory drawing of the induction heating cooking appliance in Embodiment 5 of this invention

  The first invention receives a heating coil for induction heating the cooking vessel, an inverter circuit for supplying a high-frequency current to the heating coil, and infrared rays provided below the top plate and radiated from the bottom of the previous cooking vessel. Infrared sensor for detecting the bottom surface temperature of the cooking container, a fried food mode for cooking fried food at a set temperature, an operation unit configured to perform a tact switch for selecting the set temperature, and the fried food mode Is selected, the detected temperature corresponds to the set temperature after executing an initial temperature control mode in which heating is performed with a predetermined first heating output until the detected temperature of the infrared sensor reaches the first control temperature. Control means for shifting to a stable temperature control mode for controlling the output of the inverter circuit so as to be maintained at the second control temperature, and a setting determined by the user. By setting the first control temperature, which is the detection temperature of the infrared sensor higher than the temperature, when using all types of metal pans such as aluminum and copper pans, not just the attached tempura pan, When the amount of overshoot due to warpage increases, the problem that the oil temperature is stabilized at a temperature higher than the set temperature determined by the user can be solved.

  In particular, according to the second invention, in the first invention, by providing load discriminating means for discriminating the material of the cooking container in the control means, it is possible to distinguish between iron-based and aluminum-based pans. A suitable first control temperature can be set, and cooking can be performed safely.

  In particular, in the first or second invention, when the third invention determines that a load such as frozen food has been applied after reaching the set temperature, the second heating output is increased to a third control temperature higher than the second control temperature. In this case, the oil temperature can be quickly recovered by continuing the heating and then shifting to the stable temperature control mode.

  In particular, the fourth aspect of the present invention is to reduce the duration of the heating output after the load is applied by setting the third control temperature lower than the first control temperature in any one of the first to third aspects of the invention. This makes it possible to quickly return the oil temperature.

  The fifth aspect of the invention is that, in any one of the first to fourth aspects of the invention, the amount of oil is small when the integrated power required for heating after the fried food mode operation starts and the change in the detected temperature of the infrared sensor are large. An oil amount determining means for determining, and based on the oil amount determined by the oil amount determining means, the first control temperature when the oil amount is small is equal to or higher than the first control temperature when the oil amount is large By setting so as to be, temperature control corresponding to each oil amount becomes possible.

  Hereinafter, an embodiment of the present invention will be described with an induction heating cooker as an example with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a block diagram of an induction heating cooker according to the first embodiment of the present invention.

  FIG. 2 shows an operation explanatory diagram of the induction heating cooker according to the first embodiment of the present invention.

In FIG. 1, there is a top plate 2 on which a cooking vessel 1 is placed, and a heating coil 3 for induction heating the cooking vessel 1 is disposed below the top plate 2.

  The control unit 6 includes a load determination unit 8 and an oil amount determination unit 9, and supplies a high-frequency current to the inverter circuit 4 from a power source converted into a direct current by a rectifier circuit. When a high-frequency current is supplied to the heating coil 3, an alternating magnetic field is generated, and an eddy current is generated on the bottom surface of the metal cooking vessel 1 disposed above the heating coil 3, and cooking is performed using Joule heat generated by the eddy current. The container 1 can be heated.

  An infrared sensor 5 provided at a position facing the gap of the heating coil 3 receives infrared rays emitted from the bottom surface of the cooking vessel 1 and detects the bottom surface temperature of the cooking vessel 1.

  The operation means 7 sends a signal to the control means 6 when the user performs an operation to start heating such as fried food cooking.

  In FIG. 2, the induction heating cooker of Embodiment 1 heats a cooking container by the control method including an initial temperature mode and a stable temperature control mode. Here, the “initial temperature mode” is a control mode that is first executed with the first heating output when the user gives an instruction to start heating. The “stable temperature control mode” is a control mode that is executed after the initial temperature mode has been executed for a predetermined time, and is a control mode that keeps the target temperature stable by repeatedly turning on and off the output. is there.

  The first control temperature indicates the temperature at which the infrared sensor detection temperature reaches its peak, and the second control temperature indicates the oil temperature when stable.

  About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  In the present embodiment, when the user selects the deep-fried food mode by the operation means 7 and then sets the target temperature, when the heating start signal is sent to the control means 6, the control means 6 turns the inverter circuit 4 on. Then, the heating coil 3 is energized to start heating the cooking container 1. When heating is started, the process proceeds to an initial temperature control mode in which heating is continued for a predetermined time with the first heating output, and the oil temperature gradually rises with time. At that time, the detection temperature of the infrared sensor 5 that detects the temperature of the bottom surface of the cooking container 1 by receiving the infrared radiation radiated from the bottom surface of the cooking container 1 simultaneously rises, and the detected temperature of the infrared sensor reaches the first control temperature. Then, the heating control is shifted to the stable temperature control mode. When shifting to the stable temperature control mode, the output from the inverter circuit 4 is repeatedly turned on / off so that the user reaches the target temperature set in advance, so that the infrared sensor detection temperature and the oil temperature are second controlled. Temperature control is performed to stabilize the temperature.

  By setting the first control temperature higher than the set temperature determined by the user, that is, the second control temperature, an infrared sensor having a large overshoot amount, for example, an infrared sensor higher than the first control temperature when the amount of oil is small When the detected temperature occurs, the oil temperature rises steeply, and there is a problem that the oil temperature is stable at the oil temperature higher than the set temperature. However, it can be solved by providing an upper limit value for the set temperature.

(Embodiment 2)
FIG. 3 shows an operation explanatory diagram of the induction heating cooker according to the second embodiment of the present invention.

  The first control temperature indicates the temperature at which the infrared sensor detection temperature reaches its peak, and the second control temperature indicates the oil temperature when stable. The first control temperature is divided into an aluminum system and an iron system depending on the material of the cooking vessel 1.

  About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  In the present embodiment, the heating operation is the same as that in the first embodiment, and the description thereof is omitted.

  Simultaneously with the start of heating, the load discriminating means 8 discriminates whether the material of the cooking vessel 1 is iron-based or aluminum-based, and as shown in FIG. The means 6 sets the first control temperature corresponding to each. The first control temperature in the case where the cooking container 1 is aluminum-based is set higher than the first control temperature in the iron-based system than the first control temperature in the case where the cooking container 1 is iron-based, so that the load is met. By enabling the temperature control, it is possible to prevent a sudden increase in the oil temperature for each cooking vessel 1.

(Embodiment 3)
FIG. 4 shows an operation explanatory diagram of the induction heating cooker according to the third embodiment of the present invention. In addition, since it becomes the same operation | movement as FIG. 3 of this Embodiment until oil temperature is stabilized after a heating start, description is abbreviate | omitted.

  After the oil temperature is stabilized, the output when a load such as frozen food is applied is the second heating output, and the peak of the infrared sensor detection temperature when the temperature is restored is the third control temperature.

  About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  After the oil temperature is stabilized, when a load such as frozen food is applied and the control means 6 determines that the load is applied based on the decrease in temperature detected by the infrared sensor 5, heating is performed for a predetermined time with the second heating output. When the infrared sensor detection temperature rises with the second heating output and reaches the third control temperature, the output from the inverter circuit 4 is repeatedly turned on / off so that the oil temperature is stabilized at the second control temperature. Perform temperature control.

  In the present embodiment, the bottom temperature of the cooking container 1 by the infrared sensor 5 is maintained by continuing the heating with the second heating output to the third control temperature higher than the second control temperature and then shifting to the stable temperature control mode. The oil temperature can be quickly recovered by instantaneously reading and continuing the output.

(Embodiment 4)
FIG. 5 shows an operation explanatory diagram of the induction heating cooker according to the fourth embodiment of the present invention. In addition, since it becomes the same operation | movement as FIG. 4 of this Embodiment 3, description is abbreviate | omitted.

  By setting the third control temperature to be lower than the first control temperature, the temperature is restored by loading the load after reaching the stable temperature once, so that it is lower than the first control temperature and slightly lower than the second control temperature. It becomes possible to quickly return to a stable oil temperature at a set temperature with a difference.

(Embodiment 5)
FIG. 6 shows an oil amount determination diagram of the induction heating cooker in the fifth embodiment of the present invention.

  FIG. 7 shows an operation explanatory diagram of the induction heating cooker in the fifth embodiment of the present invention.

The oil amount determination is performed based on the accumulated power after a predetermined time from the start of heating and the detected temperature change amount of the infrared sensor 5. The first control temperature indicates a temperature at which the temperature detected by the infrared sensor reaches a peak, and the first control temperature is a case where the oil amount becomes large and a case where the oil amount becomes small depending on the oil amount of the cooking container 1. It is divided into.

  About the induction heating cooking appliance comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  The amount of oil is determined from the integrated power after a predetermined time has elapsed from the start of heating and the detected temperature change amount of the infrared sensor 5 at that time. If the amount of change in the detected temperature becomes large in a predetermined time, the oil amount is reduced. If the change amount of the detected temperature becomes small within a predetermined time, it is determined that the oil amount is large. By setting the first control temperature when the oil amount is small to be equal to or higher than the first control temperature when the oil amount is large, for example, when the oil amount is small, the infrared sensor detection temperature higher than the first control temperature is If there is a large overshoot amount depending on the oil amount, the oil temperature will rise steeply and the oil temperature will be more stable than the set temperature. This can be solved by setting an upper limit.

  As described above, the induction heating cooker according to the present invention sets the first control temperature, which is the detection temperature of the infrared sensor, to be higher than the set temperature determined by the user, so that the induction heating cooker is not limited to the attached tempura pan. When all types of metal pans such as copper pans are used, the oil temperature is stable at a temperature higher than the set temperature determined by the user when the amount of overshoot due to the shape, material and warpage of the pan increases. Therefore, it can be applied to uses such as a cooking device having an automatic cooking mode for fried food.

DESCRIPTION OF SYMBOLS 1 Cooking container 2 Top plate 3 Heating coil 4 Inverter circuit 5 Infrared sensor 6 Control means 7 Operation means 8 Load discrimination means 9 Oil quantity discrimination means

Claims (5)

A top plate for placing the cooking vessel, a heating coil provided below the top plate for induction heating the cooking vessel, an inverter circuit for supplying a high frequency current to the heating coil, and a lower side of the top plate An infrared sensor that receives infrared rays emitted from the bottom surface of the cooking container and detects the bottom surface temperature of the cooking container, a frying mode for performing fried food cooking at a set temperature, and an operation for selecting the set temperature And when the fried food mode is selected, after the initial temperature control mode in which heating is performed with a predetermined first heating output until the detected temperature of the infrared sensor reaches the first control temperature, the detected temperature is Control means for shifting to a stable temperature control mode for controlling the output of the inverter circuit so as to be maintained at a second control temperature corresponding to the set temperature, and the control Stage, the induction heating cooker so as to set higher the first control temperature than the set temperature. The control means includes load determining means for determining the material of the cooking container, and the first control when the cooking container is an aluminum pan than the first control temperature when the cooking container is iron-based. The induction heating cooker according to claim 1, wherein the temperature is set high. When the control means determines that a load has been applied after the detection temperature of the infrared sensor reaches the set temperature based on the decrease state of the detection temperature, the control means heats to the third control temperature higher than the second control temperature with the second heating output. The induction heating cooker according to claim 1 or 2, wherein the operation is continued and thereafter the mode is shifted to a stable temperature control mode. The induction heating cooker according to any one of claims 1 to 3, wherein the third control temperature is set lower than the first control temperature. The control means includes integrated electric power required for heating after the fried food mode operation is started, and an oil amount determining means for determining that the oil amount is small when the change amount of the detection temperature of the infrared sensor becomes large. The first control temperature when the oil amount is small is set to be equal to or higher than the first control temperature when the oil amount is large based on the determined oil amount. The induction heating cooker described.

Images