JP2010080186A - Induction heating cooker - Google Patents

Abstract

To provide an induction heating cooker that accurately detects the presence or absence of an object to be heated and the shape of the bottom of the object to be heated, is easy to use, and has high heating efficiency.
A heating coil 30 that performs induction heating, a heating control means 32 that performs heating control by controlling supply of a high-frequency current to the heating coil 30, a plate 20 provided on the heating coil 30, and a plate The object to be heated 21 is heated by induction, and a proximity sensor is provided at the bottom of the plate. Based on information from the proximity sensor, it is possible to determine the presence and shape of the object to be heated. is there.
[Selection] Figure 2

Description

  The present invention relates to an induction heating cooker having a function of detecting the position of an object to be heated such as a pan that is induction-heated.

  Conventionally, this type of induction heating cooker electromagnetically couples the heating coil and the object to be heated based on the current flowing through the heating coil in order to confirm whether the object to be heated is placed at an appropriate position. The resonance frequency in the state or in the no-load state is detected, and it is determined whether or not the load is in the no-load state based on the detected resonance frequency (see, for example, Patent Document 1).

FIG. 4 is a diagram of a conventional induction heating cooker described in Patent Document 1. FIG. 4 discriminates the presence or absence of an object to be heated based on the resonance frequency detected by the resonance frequency detector 5 c and the current value detected by the peak current detection circuit 4.
Japanese Patent Laid-Open No. 4-95383

  However, in the conventional configuration, when an object to be heated is set at an appropriate position directly above the heating coil, the presence or absence of the object to be heated can be accurately detected, but the object to be heated is displaced from the heating coil. If an object has been set, it is determined that there is no load and heating cannot be performed, or in a configuration in which a plurality of heating coils are used and control means for controlling the supply of high-frequency current is used in common, There was a problem that the presence or absence of a heated object could not be detected.

  The present invention solves the above-mentioned conventional problems, and without detecting the heating coil current or resonance frequency, accurately detects the presence or absence of the object to be heated and the shape of the bottom of the object to be heated. An object is to provide an efficient induction heating cooker.

  In order to solve the above-described conventional problems, an induction heating cooker according to the present invention includes a heating coil that performs induction heating, a control unit that performs heating control by controlling supply of a high-frequency current to the heating coil, and a heating coil. A plate that transmits light, a heated object that is placed on the plate and is induction-heated, and a proximity sensor at the bottom of the plate, based on information from the proximity sensor, the presence or absence of the heated object, It is characterized by judging the shape. Thereby, the presence or absence and shape of a to-be-heated object can be discriminate | determined accurately, and a highly convenient induction heating cooking appliance can be implement | achieved. Compared to detection of the object to be heated by detecting the heating coil current and resonance frequency, the response is superior, and even when the user moves the object to be heated, the position of the object to be heated is automatically followed to automatically heat the object. It is also possible to perform.

  The induction cooking device of the present invention can accurately determine the presence and shape of an object to be heated without detecting the heating coil current and the resonance frequency, and can provide a highly convenient induction heating cooking device.

A first invention is a heating coil that performs induction heating, a control means that controls heating by controlling the supply of a high-frequency current to the heating coil, a plate provided on the heating coil, and a plate placed on the plate. The object to be heated by induction heating is provided with a proximity sensor at the bottom of the plate. Thereby, without detecting a heating coil current and a resonance frequency, the presence or absence of a to-be-heated object can be discriminate | determined accurately and a highly convenient induction heating cooking appliance can be implement | achieved.

  A second invention is characterized in that, in the first invention, a plurality of proximity sensors are arranged, and the presence / absence of an object to be heated and the shape are determined based on information from the plurality of proximity sensors. Thereby, the presence or absence of the object to be heated and the shape can be determined, and the determination can be made with higher accuracy.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of an induction heating cooker according to the first embodiment of the present invention, in which FIG. 1 (a) is a top view and FIG. 1 (b) is a front view. 20 is a top plate made of crystallized glass and the like, 21 is a proximity sensor that detects the object to be heated such as a pan and a frying pan placed on the top plate 20 for cooking and cooking, and the object to be heated 21 on the top plate. 22 is arranged. Reference numeral 23 denotes a heating area. In the present embodiment, the proximity sensor 22 is arranged as shown in FIG. 1A, but the present invention is not limited to this. The proximity sensor includes a type using magnetic induction, a type using a magnet, a type using a change in capacitance, and the like, but any type may be used.

  FIG. 2 is a cross-sectional view of the induction heating cooker according to the first embodiment of the present invention, in which 30 is a heating coil that heats the article to be heated 21, 31 is a coil base that supports the heating coil 30, and 32 is A heating control means for supplying a high frequency current to the heating coil 30 to inductively heat the object to be heated 21, 33 detects output signals from the plurality of proximity sensors 22, and whether the object to be heated 21 is on the top plate 20. The heated object position detecting means 34 for detecting the heating means 34 is a control means for controlling the heating control means 32 based on the information from the heated object position detecting means 33.

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

  First, when the heated object 21 such as a pan is placed in the heating area 23, the heated object 21 is detected by the proximity sensors of the first proximity sensor 220, the second proximity sensor 221, and the third proximity sensor 222. Therefore, the heated object position detecting means 33 can determine that the heated object 21 is placed. In addition, when an object other than the object to be heated such as a knife is placed, the object to be heated position detecting means 33 is detected by the first proximity sensor 220, for example, and the second and third proximity sensors 221, Since it is not detected in 222, it can be determined that the object is not an object to be heated. Thus, when it determines with the to-be-heated material 21 mounted, the to-be-heated object position detection means 33 outputs the signal with the to-be-heated object 21 to the control means 34, and the control means 34 is heated. When the object to be heated 21 is heated by the control means 32 and the object to be heated 21 is removed, it is controlled to stop the heating, and a highly safe cooker can be realized with a simple configuration. Further, the heating coil 30 is configured as shown in FIG. 3, the heating area 23 is the entire top plate 20, and the heating object 21 can be detected anywhere on the top plate 20, and the heating object is heated. Only the coil 30 can be controlled by heating, and even if the user moves the object to be heated 21, it can be detected and cooked automatically, and a design with a high degree of freedom can be performed. .

  As described above, the induction heating cooker according to the present invention can easily and quickly determine the position and shape of the object to be heated without using the current and resonance frequency of the heating coil. It can be applied not only to the cooker but also to the radiant heater type cooking device.

The block diagram of the induction heating cooking appliance in Embodiment 1 of this invention Sectional drawing of the induction heating cooking appliance in Embodiment 1 of this invention The block diagram of the induction heating cooking appliance in Embodiment 1 of this invention Configuration diagram of a conventional induction heating cooker

Explanation of symbols

20 Top plate 21 Object to be heated 22 Proximity sensor 220 First proximity sensor 221 Second proximity sensor 222 Third proximity sensor 30 Heating coil 31 Coil base 32 Heating control means 33 Heated object position detection means 34 Control means

Claims (2)

A heating coil that performs induction heating, a control means that controls heating by controlling the supply of a high-frequency current to the heating coil, a plate provided on the heating coil, and an induction heating that is placed on the plate An induction heating cooker comprising an object to be heated and a proximity sensor at a lower portion of the plate. The induction heating cooker according to claim 1, wherein a plurality of proximity sensors are provided, and the presence / absence and shape of an object to be heated are determined based on information from the plurality of proximity sensors.

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