JP5272612B2 - Induction heating cooker - Google Patents

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 is a problem that the presence or absence of a heated object cannot 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 conventional problems, the induction heating cooker of the present invention includes a heating coil for performing induction heating, a heating control means for controlling the supply of high-frequency current to the heating coil, provided on the heating coil to be Based on information from a plate having a heating area on which a heated object is placed, a plurality of vibration detection sensors provided below the plate , and a plurality of vibration detection sensors, the presence / absence and shape of the object to be heated are detected. A heated object position detecting means and a control means for controlling the heating control means based on information from the heated object position detecting means , and a plurality of vibration detection sensors are arranged below the vicinity of the center of the heating coil. A plurality of the coils are arranged at equal intervals below the outer periphery of the heating coil . Further, when the pan is removed from the plate, since vibration occurs in the plate, it can be determined when the pan is removed from the plate. This makes it possible to accurately determine the presence and shape of the object to be heated and realize a highly convenient induction heating cooker. Compared to detection of the object to be heated by detecting the heating coil current and resonance frequency, it has better responsiveness. 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 includes a heating coil that performs induction heating, a heating control unit that controls supply of a high-frequency current to the heating coil, and a plate that is provided on the heating coil and has a heating area on which an object to be heated is placed. A plurality of vibration detection sensors provided below the plate, a heated object position detecting means for detecting presence / absence and shape of the heated object based on information from the plurality of vibration detection sensors, and a heated object position detection Control means for controlling the heating control means based on information from the means, and a plurality of vibration detection sensors are arranged below the vicinity of the center of the heating coil, and a plurality of vibration sensors are provided below the vicinity of the outer periphery of the heating coil. It is characterized by being arranged at intervals . 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.

Moreover, the presence or absence of a to- be-heated object and a shape can be judged and it can judge more accurately.

  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 vibration detector that is placed on the top plate 20 and detects a heated object such as a pan or a pan that cooks the food to be cooked, and a heated object 21 on the top plate. A sensor 22 is arranged. Reference numeral 23 denotes a heating area. In the present embodiment, the vibration detection sensor 22 is arranged as shown in FIG. 1A, but the present invention is not limited to this.

  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 vibration detection 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 whether or not 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 object to be heated 21 such as a pan is placed in the heating area 23, the vibration detection sensors of the first vibration detection sensor 220, the second vibration detection sensor 221, and the third vibration detection sensor 222, In order to detect the heated object 21, the heated object position detection unit 33 can determine that the heated object 21 is placed. When an object other than the object to be heated, such as a knife, is placed, the object to be heated position detection means 33 detects, for example, the first vibration detection sensor 220 and the second and third vibration detection sensors. Since it is not detected in 221, 222, it can be determined that the object is not 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 highly convenient heating cooker is realized. be able to.

  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

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

Claims (1)

A heating coil that performs induction heating; heating control means that controls the supply of high-frequency current to the heating coil; a plate that is provided on the heating coil and has a heating area on which an object to be heated is placed ; A plurality of vibration detection sensors provided below, a heated object position detecting means for detecting presence / absence and shape of the heated object based on information from the plurality of vibration detection sensors, and the heated object position detection Control means for controlling the heating control means on the basis of information from the means, and the plurality of vibration detection sensors are arranged one below the center of the heating coil and below the outer periphery of the heating coil. A plurality of induction heating cookers arranged at equal intervals .

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