JP5877303B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker used for general household and business use.

  Conventionally, this type of induction heating cooker maintains a specified time within a set temperature (T2) higher than the set temperature (T2) after the oil temperature of the pan reaches the set temperature (T1) during frying. After the specified time has passed, the appropriate temperature notification is given. In addition, when the temperature reaches the set temperature (T1), the user is notified in advance by a buzzer, voice, or the like, and the remaining time of the specified time is displayed on the display unit (for example, Patent Document 1).

JP 2005-100790 A

  However, in the conventional configuration, the time to the proper temperature is indefinite due to the difference in the material, size, thickness, and oil amount of the pan to be heated, and the temperature and oil temperature of the pan at the start of heating. In the configuration of the designated time that is a fixed time from the temperature arrival, there is a problem that the accuracy of the remaining time until the notification of the appropriate temperature is poor without being in an appropriate temperature state within that time.

  The present invention solves the above-described conventional problems, can accurately recognize the time until the oil temperature reaches an appropriate temperature, facilitates preparation of the cooking, improves usability, and immediately after the preheat notification. It is an object of the present invention to provide an induction heating cooker that has an extra energy saving effect and is easy to use.

In order to solve the conventional problems, a heating cooker according to the present invention includes a top plate on which an object to be heated is placed, a heating coil that is magnetically coupled to the object to be heated, and a resonant capacitor that resonates with the heating coil. A resonance circuit having a switching element that generates a resonance current in the resonance circuit by being turned on and off, and an inverter that supplies power to the resonance circuit from a commercial power supply; and a temperature that detects a bottom surface temperature of the object to be heated Detecting means, control means for outputting a drive signal of the switching element so as to control the heating output of the heating coil so that the temperature obtained from the temperature detecting means becomes a predetermined control temperature, and the predetermined control temperature. The temperature setting means that can be set, the display means for displaying the setting contents of the temperature setting means, and cooking can be started at the set temperature set by the temperature setting means. A notification means for notifying that the preheating is completed by a buzzer, light, sound, or screen display, and the control means starts heating at a predetermined heating output, and the temperature of the object to be heated is equal to the set temperature. After exceeding, when the temperature of the oil conducted from the object to be heated exceeds the set temperature, the heating is stopped or the temperature of the object to be heated is changed from rising to falling after the heating is weakened. When the maximum temperature reaching point that is the inflection point is obtained and the difference between the maximum temperature reaching the maximum temperature reaching point and the set temperature is large, the preheating completion notification time to the preheating completion notification point at which cooking can be started is lengthened. On the contrary, if it is small, the time is changed to a short time, and the buzzer, light, voice, and screen display at the preheating completion prior notification point that goes back from the preheating completion prior notification time set in advance from the changed preheating completion notification point. Preheating by notification means By performing the pre-notification of completion, changes pot material (size, thickness) for heating and the amount of oil or heating start temperature and the oil temperature difference by the respective heating environment combined with the broadcast time of the completion of preheating, respectively Then, based on the changed preheating notification time, the preliminary notification of the completion of preheating is performed accurately according to various heating environments by setting the time point that is set in advance as a prior notification point for completion of preheating. It is possible to do that.

  The induction heating cooker according to the present invention has a high-precision preheating completion that is not affected by the material and shape of the object to be heated, the amount of oil or food contained in the object to be heated, and the temperature of the object to be heated at the start of heating. Advance notification can be made, the extra heating time is reduced, the energy saving effect is high, and the usability can be improved.

The figure which shows the structure of the induction heating cooking appliance in Embodiment 1-5 of this invention. The figure which shows the heating control method of the oil temperature of the induction heating cooking appliance in Embodiment 1-5 of this invention.

A first aspect of the present invention is a resonant circuit having a top plate for placing an object to be heated, the object to be heated is magnetically coupled to heating coil, and a resonant capacitor which resonates with the heating coil, and the resonance by turning on and off a switching element for generating a resonant current in the circuit, a temperature detection means for detecting an inverter for supplying power, a bottom temperature before Symbol object to be heated in the resonant circuit from the commercial power supply, obtained from the temperature sensing means A control means for controlling the heating output of the heating coil by outputting a drive signal for the switching element so that the temperature becomes a predetermined control temperature, a temperature setting means for setting the predetermined control temperature, and the temperature display means for displaying the setting contents of the setting unit, the temperature setting set set temperature cooking buzzer or light or sound to the time that can be started by means screen display And a notification means for notifying a more completion of preheating, the control unit starts heating at a predetermined heating output, after the temperature of the object to be heated exceeds the set temperature, the heat conduction from the heated object When the heated oil temperature exceeds the set temperature, stop the heating or weaken the heating, and then the maximum temperature reaching point, which is an inflection point at which the temperature of the heated object changes from rising to falling. determined, wherein the difference between the maximum temperature and the set temperature of the maximum temperature point is large, a long preheating completion notification time until completion of preheating notification point can start cooking, also change to the Most short time small conversely The preheating completion notification point is notified by the notification means of the buzzer, light, voice, and screen display at the preheating completion notification point that has been set in advance from the changed preheating completion notification point. Is.

  Thereby, the induction heating cooking appliance which performs prior notification of the exact preheating completion according to the material and shape of a to-be-heated material is realizable.

According to a second aspect of the invention, in particular, in the first aspect of the invention, there is provided a material detection means for detecting the material of the object to be heated from the relationship between a high-frequency current flowing through the heating coil or an applied high-frequency voltage and a power supply current , The material detecting means discriminates the material of the object to be heated, starts heating with a heating output that matches the material of the object to be heated , obtains a temperature rise value from the output of the temperature detecting means every predetermined time, and sets the setting. before reaching point temperature, said exceeds a predetermined temperature rise value determined for each material of the object to be heated, it is determined that the temperature of the heated object had been prewarmed, from the object to be heated Stop heating at a temperature where the heat- transferred oil temperature is lower than the set temperature, or weaken the heating so that the maximum temperature reaching point is the same value as when heating an object to be heated that has not been heated in advance. control Is shall.

  Thereby, it is possible to realize an induction heating cooker that performs an advance notice of the completion of preheating accurately without being influenced by the state at the start of heating of the object to be heated.

In a third aspect of the invention, in particular, in the first aspect of the invention, there is provided a material detection means for detecting the material of the object to be heated from the relationship between a high-frequency current flowing through the heating coil or an applied high-frequency voltage and a power supply current , The material detecting means discriminates the material of the object to be heated, starts heating with a heating output that matches the material of the object to be heated , obtains a temperature rise value from the output of the temperature detecting means every predetermined time, and sets the setting. before reaching the temperature and falls below the predetermined temperature rise value determined for each material of the object to be heated, than the amount the amount of a given said object to be heated contained oils and food in also determined to be high state is the time until the completion of preheating notification point can start cooking which changes longer than the predetermined amount.

  Thereby, the induction heating cooking appliance which performs prior notification of exact preheating completion is realizable.

A fourth invention is, in particular, in the first to third any one invention of are those that can be modified to suit the completion of preheating advance notification time preference of the user.

  Thus, an induction heating cooker that is more convenient to use can be realized.

A fifth invention is, in particular, in the first to fourth one of the invention, Aaru said notifying means in said preheating complete pre notification point at which the voice or was only a character output.

  By this, the induction heating cooker which can avoid the failure | failure which throws in foodstuffs or starts cooking before completion of preheating is realizable by distinguishing preheating completion notification and preheating completion preliminary notification reliably. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a diagram illustrating a configuration of an induction heating cooker according to a first embodiment of the present invention, and FIG. 2 is a diagram illustrating a method for controlling oil temperature heating in the induction heating cooker according to the present invention.

  1 and 2, the induction heating apparatus according to the present embodiment uses a commercial AC power source 5 as a driving power source, and generates a high-frequency magnetic field provided below the top plate 2 on which the object to be heated 1 is placed. A heating coil 3 for heating the object to be heated 1 such as a pan, a temperature detecting means 4 for detecting the temperature of the bottom surface of the object to be heated 1, and a temperature obtained from the temperature detecting means 4 are set by the temperature setting means 8 The control means 7 for controlling the heating output of the heating coil 3 through the inverter circuit 6 so as to be the control temperature, the display means 9 for displaying the setting contents of the temperature setting means 8, and the time when cooking can be started at the set temperature Is informed by a buzzer, light, voice, screen display or the like.

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

  First, when electric power is supplied from the inverter circuit 6 to the heating coil 3, an induction magnetic field is generated in the heating coil 3, and the object to be heated 1 on the top plate 2 is heated. By this induction heating, the temperature of the article to be heated 1 rises, and for example, the oil temperature 21 in the article to be heated 1 rises.

  When the oil temperature 21 exceeds the set temperature (Ta) 22 set by the temperature setting means 8, heating is stopped by the control means 7 based on the oil temperature increase rate 29, or the heating output is The maximum temperature reaching point (A) 24, which is an inflection point at which the temperature of the article 1 is weakened and changes from rising to falling, is obtained.

  A preheating completion notification time (La) 27 to a preheating completion notification point (C) 26 at which cooking can be started is determined based on the difference between the maximum reached temperature (Tp) 23 and the set temperature (Ta) 22 as the inflection point. .

  Thereby, for example, if the difference between the maximum temperature (Tp) 23 and the set temperature (Ta) 22 is large, the preheating completion notification time (La) 27 is long, and conversely, if it is small, it can be changed to a short time. .

  Next, at the preheating completion prior notification point (B) 25 that goes back to the preset preheating completion prior notification time (Lb) 28 after the variable preheating completion notification point (C) 26 is determined, As a prior notice of the completion of preheating by a buzzer, light, voice, screen display, etc., the notice means 10 can inform the user.

  Further, at the maximum temperature reaching point (A) 24, the temperature detection means 4 detects the maximum temperature reached (Tp) 23, and based on the difference between the maximum temperature reached (Tp) 23 and the set temperature (Ta) 22. The preheating completion notification time (La) 27 up to the preheating completion notification point (C) 26 at which cooking can be started may be changed.

  Further, the preheating completion notification time (La) 27 may be determined from the maximum temperature reached (Tp) 23 detected by the temperature detection means 4 and the oil temperature increase rate 29 at the maximum temperature arrival point (A) 24.

  As described above, it is possible to perform advance notification of completion of preheating with high accuracy.

(Embodiment 2)
Next, a second embodiment will be described. A description of the same parts as those in the first embodiment will be omitted, and only differences will be described.

  The difference from the first embodiment is that the material of the object to be heated 1 is discriminated from the relationship between the high-frequency current or high-frequency voltage generated by the heating coil 3 shown in FIG. 1 and the power supply current, and heating is started according to the material. Thereafter, the oil temperature increase rate 29 is obtained from the output of the temperature detecting means 4 at predetermined time intervals.

  And when it reaches the set temperature (Ta) 22 and exceeds a predetermined temperature rise value determined for each material of the article 1 to be heated, it is determined that the temperature of the article 1 to be heated has been warmed in advance. When reaching the oil temperature high temperature start set temperature (Tb) 30 that is lower than the set temperature (Ta) 22, the heating is stopped or the heating is weakened.

  This prevents the maximum temperature reaching point (A) 24 from becoming higher than the temperature reached when the object to be heated is heated in advance, and the value of the preheating completion notification time (La) 27 is reduced from a predetermined design value. Since it can be controlled so as to have a correct value without deviating, it is possible to accurately notify the completion of preheating without being influenced by the state at the start of heating of the object to be heated.

(Embodiment 3)
Next, Embodiment 3 will be described. A description of the same parts as those in the first embodiment will be omitted, and only differences will be described.

  The difference from the first embodiment is that the material of the object to be heated 1 is discriminated from the relationship between the high-frequency current or high-frequency voltage generated by the heating coil 3 shown in FIG. 1 and the power supply current, and heating is started according to the material. Thereafter, an oil temperature increase rate 29 is obtained from the output of the temperature detecting means 4 at predetermined time intervals.

  And if it falls below the predetermined temperature rise value determined for every material of the to-be-heated object 1 until it reaches the preset temperature (Ta) 22, the oil and cooked food accommodated in the to-be-heated object 1 It is determined that the amount is larger than a predetermined amount, and the preheating completion notification time (La) 27 is changed to be longer, so that an accurate prior notification of the completion of preheating is performed regardless of the content of the heated object. Is possible.

(Embodiment 4)
Next, a fourth embodiment will be described. Description of the same parts as those in the first to third embodiments will be omitted, and only differences will be described.

  The difference from the first to third embodiments is that the time setting means 11 shown in FIG. 1 changes the preheating completion prior notification time (Lb) 28 shown in FIG. It is possible to provide an induction heating cooker that performs good prior notification.

(Embodiment 5)
Next, a fifth embodiment will be described. Description of the same parts as those in the first to fourth embodiments will be omitted, and only differences will be described.

  The difference from the first to fourth embodiments is that the notification means 10 shown in FIG. 1 outputs only the voice output and the character expression output at the preheating completion pre-notification point (B) of the preheating completion, and the preheating completion notification. Make sure that it can be distinguished from the point (C).

For example, buzzer sounds and flashing lights are not meaningful on their own, but they are specially learned and differentiated by the user, which may lead to misunderstandings. In the notification, it is possible to provide an induction heating cooker that performs prior notification that can avoid the risk of starting and failing before completion of preheating by omitting an output that does not make sense by itself.

  As described above, the cooking device according to the present invention has a notification time of completion of preheating according to each heating environment depending on the material, shape, and amount of oil to be heated, the amount of oil, the temperature at the start of heating, and the oil temperature. Preliminary notification of completion of preheating with high accuracy according to various heating environments by determining each time and using the determined preheating notification time as a prior notification point for completion of preheating based on the determined preheating notification time This is effective for use in a cooking device.

DESCRIPTION OF SYMBOLS 1 Object to be heated 2 Top plate 3 Heating coil 4 Temperature detection means 5 Commercial AC power supply 6 Inverter circuit 7 Control means 8 Temperature setting means 9 Display means 10 Notification means 21 Oil temperature 22 Set temperature (Ta)
23 Maximum temperature (Tp)
24 Maximum temperature reaching point (A)
25 Pre-heating completion prior notification point (B)
26 Preheating completion notification point (C)
27 Preheating completion notification time (La)
28 Pre-warming completion advance notice time (Lb)
29 Oil temperature rise rate 30 Oil temperature high temperature start set temperature (Tb)

Claims (5)

Generating a top plate for placing an object to be heated, the object to be heated is magnetically coupled to heating coil, and a resonant circuit having a resonant capacitor which resonates with the heating coil, and, a resonance current to the resonant circuit by turning on and off to a switching element, an inverter supplying power to the resonance circuit from the commercial power source, before Symbol a temperature detecting means for detecting a bottom temperature of the heated object, wherein the temperature detecting means temperature predetermined control temperature obtained from A control means for controlling the heating output of the heating coil by outputting a drive signal of the switching element so as to be, a temperature setting means capable of setting the predetermined control temperature, and setting contents of the temperature setting means are displayed. and a display unit, the temperature setting set set temperature cooking time the buzzer or light or sound that can be started by means more preheating complete screen display Comprising a notification means for notifying, to,
The control means starts heating at a predetermined heating output, and after the temperature of the object to be heated exceeds the set temperature, when the oil temperature thermally conducted from the object to be heated exceeds the set temperature , either stop the heating, or after weakening the heating, the seek maximum temperature point is the inflection point of the temperature of the heated object changes from rising to falling, the highest reached temperature of the maximum temperature point When the difference between the set temperature is large, a long preheating completion notification time until completion of preheating notification point can start cooking, also change to the Most short time small Conversely, preset from the changed the preheating completion notification point induction heating cooker to pre notification of completion of preheating by been preheated completed advance notification time predated completion of preheating prior notification point buzzer or light or sound, screen display of the notification means. A material detection means for detecting the material of the object to be heated from the relationship between the high-frequency current or high-frequency voltage generated by the heating coil and the power supply current ;
The material of the material of the object to be heated determined by the detection means, obtains the post-start heating by the heating output to match the material of the object to be heated, the temperature rise value from the output of said temperature detecting means at every predetermined time, the setting If a predetermined temperature rise value determined for each material of the object to be heated is exceeded before reaching the temperature, it is determined that the temperature of the object to be heated has been warmed in advance, and heat is generated from the object to be heated. in conducting the oil temperature is a temperature lower than the set temperature, or to stop heating, or weaken the heating, so that the maximum temperature point is the same value as when heating the object to be heated that is not pre-warmed The induction heating cooker of Claim 1 controlled to. A material detection means for detecting the material of the object to be heated from the relationship between the high-frequency current or high-frequency voltage generated by the heating coil and the power supply current ;
The material to determine the material of the object to be heated by the detecting means, wherein after the start of heating by the heating output to match the material of the object to be heated, obtains a temperature rise value from the output of the temperature detecting means at every predetermined time, the setting temperature If the temperature rises below a predetermined temperature rise value determined for each material of the object to be heated, the amount of oil or cooked food contained in the object to be heated is less than a predetermined amount. it is determined to be a high state, the induction heating cooker according to the time until the completion of preheating notification point can start cooking in claim 1, longer than the predetermined amount. The induction heating cooking appliance of any one of Claims 1-3 which can change the said pre-heating completion prior notification time according to a user's liking. Induction heating cooker according to the notification unit to any one of claims 1 to 4 voice or that only character output at the completion of preheating prior notification point.

Images