JP4285502B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker using an infrared sensor, which is used in general homes and restaurants.

  Conventionally, this type of induction heating cooker has generally used a method in which a temperature sensing element such as a thermistor is brought into contact with a top plate on which a pan is placed to indirectly detect the temperature of the pan bottom.

  Moreover, the method of detecting the infrared intensity output from the pan bottom with an infrared sensor was taken as a more responsive detection method.

  In the detection by the infrared sensor, the detection of the amount of infrared rays radiated from the object to be heated due to the contamination of the top plate becomes insufficient, and there is a problem that an accurate temperature cannot be detected.

In order to solve this problem, the temperature detected from the infrared sensor and the temperature detected from the thermosensitive element in thermal contact with the object to be heated are used to detect the contamination of the top plate and to actually detect the radiation temperature of the object to be heated. The method of correcting was taken.
JP 2002-299029 A

  However, in the conventional technical configuration as described above, when the temperature at the bottom of the pan is low, the difference in the amount of infrared rays that can be detected according to the temperature is small. There is a problem that the contamination of the top plate cannot be detected from the temperature detected from the temperature element, and the radiation temperature of the object to be heated cannot be corrected.

  Further, when the pan bottom is greatly deformed, there is a problem that it is difficult for the temperature sensing element to accurately detect the temperature of the pan bottom, and it is difficult to accurately detect dirt.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide an induction cooking device that can detect dirt on a top plate without actually heating an object to be heated.

In order to solve the above conventional problems, the induction heating cooker of the present invention is provided, a top plate infrared radiation is passed through a heating coil for induction heating the pan on the top plate, a high-frequency current to the prior SL heating coil An inverter circuit, an infrared sensor for detecting infrared radiation radiated from the bottom of the pan , control means for controlling the output of the inverter circuit according to the output of the infrared sensor, and the output according to the output of the inverter circuit blot detection for detecting a pan without detecting means for detecting the presence or absence of the pan on the top plate, the contamination of the top plate from the output of the infrared sensor in a state detected that there is no pot in the pot without detecting means and means, having an illuminance sensor for measuring the illuminance around the mounted housing below said top plate, said dirt detection means, before The relationship between the output of the infrared sensor and the output of the illuminance sensor when there is no dirt is stored, and the output and illuminance of the infrared sensor measured in a state where the panless detection means detects that there is no pan The relationship between the output of the sensor and the relationship between the output of the infrared sensor and the output of the illuminance sensor when there is no dirt are compared. If they are the same, the dirt judgment level is not corrected and the output of the infrared sensor is small. the dirt determination level is corrected if, wherein when soiled by the determination level to determine the level of contamination of said top plate, said control means having detected the contamination determination level above a certain said dirt detection means, said notification It is configured to notify that effect by means .

  This can improve cooking performance and safety.

Induction heating cooker according to the present invention, the temperature of the pan can be detected by the infrared radiation from the pan bottom, and when detecting Re fouling of the top plate, may be reported or displayed to the user, key management performance and safety Can be improved.

The first invention is radiated from the top plate and a heating coil for induction heating the pan on the top plate, an inverter circuit for supplying a high-frequency current before Symbol heating coil, the bottom of the pot infrared passes Infrared sensor for detecting infrared rays, control means for controlling the output of the inverter circuit according to the output of the infrared sensor, and no pan for detecting the presence or absence of the pan on the top plate according to the output of the inverter circuit a detection unit, a stain detecting means for detecting fouling of said top plate from the output of the infrared sensor in a state detected that there is no pot in the pot without detecting means, and notifying means that is constituted by the voice synthesis section the provided, mounted below said top plate having an illuminance sensor for measuring the illuminance of the surrounding housing, said dirt detection means, the dirt The relationship between the output of the infrared sensor and the output of the illuminance sensor when not present is stored, and the output of the infrared sensor and the illuminance sensor measured in a state where the panless detection means detects that there is no pan The relationship between the output and the relationship between the output of the infrared sensor and the output of the illuminance sensor when there is no dirt is compared. If they are the same, the dirt determination level is not corrected, and the output of the infrared sensor is reduced. the dirt determination level corrected, the dirt by determination level to determine the level of contamination of said top plate, said control means when the stain detection means detects the certain level of the dirt determination level, the notification means Te by notification if, can tell that it has detected the contamination by dirt detection means easy to understand user, Qing top plate optionally It is possible to get the.

In addition , an illuminance sensor that is attached below the top plate and measures the illuminance around the housing is provided, and the dirt detection means stores the relationship between the output of the infrared sensor and the output of the illuminance sensor when there is no dirt. In addition, the relationship between the output of the infrared sensor and the output of the illuminance sensor measured in a state where the panless detection means detects that there is no pan, the output of the infrared sensor when there is no dirt, and the Comparing the relationship of the output of the illuminance sensor, if it is the same, the dirt judgment level is not corrected, and if the output of the infrared sensor is small, the dirt judgment level is corrected, and the dirt on the top plate is corrected based on the dirt judgment level. by determining the level of, as possible out to the accurate determination than doing dirt determination only the infrared sensor.

A second invention is, in particular, in the first invention, by a configuration having an illuminance sensor for measuring the illuminance of the surrounding housing on the display portion provided in the top plate downward, the operation unit casing dirt There for less than the dirty of the top plate on the heating coil, as possible out to accurately determine the contamination of the top plate.

In particular, the third aspect of the present invention includes the display unit according to the first or second aspect of the invention, and when the stain detection unit detects a stain determination level of a certain level or more , the notification unit notifies the fact, When the display unit displays that fact, it can be communicated visually to the user.

Embodiments and reference embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by this embodiment or reference form .

( Reference form 1)
FIG. 1 is a block diagram showing a configuration of an induction heating cooker according to a first reference embodiment of the present invention.

Induction heating cooker according to this reference embodiment includes a heating coil 2 for heating the pot 1, a top plate 3 for placing the pot 1 at the top of the heating coil 2, the pot from the heating coil 2 provided on the heating coil 2 below Ferrite 4 that concentrates the magnetic flux to 1, an infrared sensor 5 that is provided below the heating coil 2 to detect infrared rays emitted from the bottom of the pan 1, and a temperature calculator that calculates the temperature of the pan bottom according to the output of the infrared sensor 5 Means 6, panless detection means 7 for detecting the presence or absence of pan 1 on top plate 3 in accordance with the output of heating coil 2, and infrared detection when panless detection means 7 detects that there is no pan 1 A dirt detecting means 8 for detecting dirt on the top plate 3 from the output of the sensor 5 and a control means 10 for controlling the output of the inverter circuit 9 in accordance with the output of the infrared sensor 5 and the dirt on the top plate 3 are provided.

In the above first reference, Power, not shown, the inverter circuit 9 supplying a current to the heating coil 2 by operating the operation switch. The presence or absence of the pan 1 is detected on the upper surface of the top plate 3 according to the output of the heating coil 2. In the state where the pan 1 is not detected, the contamination of the top plate 3 is detected from the output of the infrared sensor 5. Means 8 for detecting dirt. After the dirt is detected, the pan 1 is placed on the upper surface of the top plate 3 and the operation switch is operated to cause the inverter circuit 9 to pass a current through the heating coil 2. After confirming that the pan 1 is present from the output of the heating coil 2, an induction magnetic field is generated in the heating coil 2, and the pan 1 on the top surface of the top plate 3 is induction-heated. Due to this induction heating, the temperature of the pan 1 rises and the object to be heated in the pan 1 is cooked. Here, when heating of the pan 1 is started, infrared rays corresponding to the temperature of the pan 1 pass through the top plate 3 from the bottom of the pan 1. The infrared sensor 5 detects this infrared ray, and the temperature of the pan bottom is calculated by the temperature calculation means 6 from the amount of the infrared ray. This calculated temperature is output to the control means 10, and the control means 10 controls the current supplied to the heating coil 2 to be a predetermined temperature. Here, when dirt is attached to the top plate 3, the infrared rays from the pan 1 are attenuated by the dirt and enter the infrared sensor 5. Therefore, the control means 10 corrects the electric power supplied from the inverter circuit 8 to the heating coil 2 according to the detection determination of the dirt detection means 8 performed without the pan 1.

  With this configuration, cooking can be performed while accurately controlling the temperature of the pan by accurately detecting the temperature of the pan bottom of the pan 1 without being affected by dirt.

  In addition, when it detects that there is no pan 1 by the detection result of the panless detection means 7, correction is performed according to the detection determination of the dirt detection means 8, but when there is a pan 1, the process is performed without performing correction. It may be continued, or a notification means may be provided so that the user can make corrections by notifying the user so that the pan 1 is temporarily removed.

(Embodiment 1 )
FIG. 2 is a block diagram showing the configuration of the induction heating cooker according to the first embodiment of the present invention.

Induction heating cooker of the present embodiment, a point with the illuminance sensor 11 on the top plate 3 the lower surface, only a point in which a sound reporting means 12 is different from Embodiment 1 of reference, the same structure and operation of the rest The same reference numerals are given to the parts representing the effects, and detailed description will be omitted, and different points will be mainly described.

In the first embodiment, the illuminance sensor 11 is attached to the lower surface of the top plate 3. In FIG. 2, the illuminance sensor 11 detects the illuminance level around the housing by the output from the illuminance sensor 11 when the panless detection means 7 that detects the presence or absence of the pan 1 detects that the pan 1 is not present. This illumination level, for example, an output of the infrared sensor 5 of the absence of contamination during shipment and allowed to store the output of the relationship between the illuminance sensor 11, actual use, red in the absence of pan 1 before the start of heating The relationship between the output of the outer sensor 5 and the output of the illuminance sensor 11 is compared with that at the time of shipment, and if it is the same, no correction is performed, and if the output of the infrared sensor 5 is weaker (smaller) than that at the time of shipment The dirt determination level detected by the dirt detecting means 8 is corrected. As a result, the dirt level of the top plate 3 can be accurately determined. The control means 10 corrects the power supplied from the inverter circuit 8 to the heating coil 2 in accordance with the contamination level.

With this configuration, the temperature at the bottom of the pan 1 can be accurately detected without being affected by dirt, and cooking can be performed while accurately controlling the temperature of the pan 1 . Further, when the dirt detection means 8 detects a dirt determination level of a certain level or more, the voice notification means 12 notifies the user to that effect so that the top plate 3 can be cleaned.

(Embodiment 2 )
FIG. 3 is a block diagram showing the configuration of the induction heating cooker in the second embodiment of the present invention.

The induction heating cooker of the present embodiment is different from the reference embodiment 1 only in that a display unit (operation unit) 13 is provided on the lower surface of the top plate 3 and an illuminance sensor 11 is provided therein. In addition, the same reference numerals are given to the portions representing the operational effects, and detailed description will be omitted, and different points will be mainly described.

In the second embodiment, the illuminance sensor 11 is attached to the inside of the display unit 13 on the lower surface of the top plate 3. In FIG. 3, the illuminance sensor 11 detects the illuminance level around the housing by the output from the illuminance sensor 11 when the panless detection means 7 for detecting the presence or absence of the pan detects that the pan 1 is not present. The dirt determination level detected by the dirt detector 8 is corrected based on the illuminance level. As a result, the dirt level of the top plate can be accurately determined. The control means 10 corrects the power supplied from the inverter circuit 8 to the heating coil 2 in accordance with the contamination level.

Since the illuminance sensor 11 is separated from the heating coil 2 and provided inside the display unit 13, the upper part of the display unit 13 is less contaminated than the upper part of the heating coil 2 for cooking. The detected dirt determination level can be corrected accurately. With this configuration, the temperature at the bottom of the pan 1 can be accurately detected without being affected by dirt, and cooking can be performed while accurately controlling the temperature of the pan 1 .

  In addition, when the dirt detection means 8 detects a dirt judgment level above a certain level, the display unit 13 visually informs the user of that fact, so that it can be easily communicated to a hearing-impaired person. In some cases, the top plate 3 can be cleaned.

As described above, the induction heating cooker according to the present invention can detect the temperature of the pan with infrared rays from the bottom of the pan, and can notify or display when the top plate is dirty, so the temperature is detected with infrared rays. It can also be applied to uses such as heating equipment.

Sectional drawing which shows the structure of the induction heating cooking appliance in the reference form 1 of this invention Sectional drawing which shows the structure of the induction heating cooking appliance in Embodiment 1 of this invention. Sectional drawing which shows the structure of the induction heating cooking appliance in Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pan 2 Heating coil 3 Top plate 4 Ferrite 5 Infrared sensor 6 Temperature calculation means 7 Panless detection means 8 Dirt detection means 9 Inverter circuit 10 Control means 11 Illuminance sensor 12 Voice notification means 13 Display part (operation part)

Claims (3)

An infrared sensor for detecting the top plate infrared radiation is passed through a heating coil for induction heating the pan on the top plate, an inverter circuit for supplying a high-frequency current before Symbol heating coil, infrared rays emitted from the bottom of the pan Control means for controlling the output of the inverter circuit according to the output of the infrared sensor, no pan detecting means for detecting the presence or absence of the pot on the top plate according to the output of the inverter circuit, and the pot comprising a stain detecting means for detecting fouling of said top plate from the output of the infrared sensor in a state detected that there is no pan at no detecting means, and a notification means configured by the voice synthesis section, said top An illuminance sensor that is attached below the plate and measures the illuminance around the housing; Store the relationship between the output of the infrared sensor and the output of the illuminance sensor, and the relationship between the output of the infrared sensor and the output of the illuminance sensor measured in a state where the panless detection means detects that there is no pan The relationship between the output of the infrared sensor and the output of the illuminance sensor when there is no dirt is compared, and if it is the same, the dirt judgment level is not corrected, and if the output of the infrared sensor decreases, the dirt judgment level And the control means determines the level of dirt on the top plate based on the dirt judgment level, and when the dirt detection means detects the dirt judgment level above a certain level, the control means notifies the fact by the notification means. Induction heating cooker to inform . Induction heating cooker of claim 1, further comprising a display unit provided with an illuminance sensor to the top plate downward. A display unit, control unit, according to claim stain detection means when detecting a predetermined or more soil determination level, instead of notifying to that effect by notifying means, wherein the display unit displays to that effect 1 Or the induction heating cooking appliance of 2.