JP4428167B2 - Induction heating device - Google Patents

Description

  The present invention relates to an induction heating apparatus having a water heater function capable of accurately detecting a pan on a top board with an infrared sensor or the like.

  Conventionally, when this type of induction heating apparatus supplies electric power to the heating coil 103, an induction magnetic field is generated in the heating coil 103, and the pan 101 on the top plate 102 is induction-heated. The object to be heated in the pan 101 is cooked. Here, when heating of the pan 101 is started by the heating coil 103, infrared rays corresponding to the temperature of the pan 101 are transmitted through the transmission part 105 provided under the pan 101, and the amount of this infrared ray is detected by the infrared detecting means 107. Is detected, and the temperature conversion means 108 determines the temperature of the pan 101 based on the amount of infrared rays, and controls the inverter 104 to control the electric power so as to reach a predetermined temperature to cook the object to be heated (for example, Patent Document 1).

FIG. 7 shows a conventional induction heating cooker described in Patent Document 1. As shown in FIG. As shown in FIG. 7, a heating coil 103 that heats the pan 101, a top plate 102 on which the pan 101 is placed, a transmission unit 105 that is disposed in the center of the top plate 102 and transmits infrared rays from the pan 101, It comprises infrared detecting means 107 for detecting infrared light that has passed through the transmission part 105 and control means 109 for controlling the output of the inverter 104.
JP 2003-317918 A

  However, in the conventional configuration, since the temperature of the pan is directly measured and can be accurately detected, the power supplied to the heating coil is maintained at a high heating power during the boiling determination, and it is determined that the boiling has occurred when the temperature change is stabilized for a while. Therefore, there is a problem that during boiling judgment, the amount of heat is gradually accumulated in the object to be heated and may be spilled depending on the shape of the pan and the amount of liquid.

The present invention solves the above-mentioned conventional problem, and when the temperature detection condition before boiling is satisfied, the power supplied to the heating coil is lowered to suppress the amount of heat applied to the object to be heated, and when the boiling detection condition is satisfied. by performing boiling detection, and to provide an induction heating apparatus capable of performing a boiling detection without stable object to be heated to Fukikoboreru.

In order to solve the conventional problems, the induction heating apparatus of the present invention includes a heating coil for heating a pan, a top plate for placing the pan on the heating coil, and a control for controlling power supplied to the heating coil. Means, infrared detecting means for detecting the amount of infrared rays from the pan, temperature converting means for converting the temperature of the pan from the output of the infrared detecting means, and per unit time before boiling after heating converted by the temperature converting means Detecting whether the temperature change value is equal to or lower than a first predetermined value, and detecting the temperature before boiling when the temperature change value is equal to or lower than the first predetermined value; Boiling detection means for detecting whether or not a temperature change value is equal to or less than a second predetermined value smaller than the first predetermined value, and detecting boiling when the temperature change value is equal to or less than the second predetermined value. and a plurality of liquid by detecting the liquid amount of the inner bowl Comprising a liquid amount detecting means for classifying the classification, and the control means, the boiling temperature before detecting means, the liquid on the basis of the set value of the power to the liquid volume divided by the time of the said boiling temperature before detection further the temperature change value down to a value determined for each volume indicator is the boiling detecting means becomes below the second predetermined value set for each of the liquid volume segment to said boiling detection in the next step The control to shift is performed.

As a result, the amount of infrared rays radiated from the surface of the pan can be captured, and liquid level detection means for detecting the liquid volume in the pan and classifying it into a plurality of liquid volume categories is provided. When the temperature change value per unit time is equal to or lower than the first predetermined value by the detecting means, the setting of the power supplied to the heating coil is lowered to a value determined for each liquid volume category, and the temperature change value is When the boiling detection means detects the boiling and becomes below the second predetermined value set for each liquid amount division smaller than the first predetermined value, the process proceeds to the next step.

The induction heating device of the present invention includes a heating coil for heating the pan, a top plate for placing the pan on the heating coil, a control means for controlling the power supplied to the heating coil, and an infrared ray from the pan. detecting an infrared detection means for detecting the amount and temperature conversion means for converting the temperature of the pot from an output of said infrared detection means, whether or not the temperature of the temperature conversion unit has converted becomes a temperature of the Jo Tokoro, Pre- boiling temperature detection means for detecting temperature before boiling when the converted temperature reaches the predetermined temperature, detecting whether or not the temperature change value is equal to or less than a second predetermined value, and the temperature change value is Boil detecting means for detecting boiling when the second predetermined value or less is reached; and liquid amount detecting means for detecting the liquid amount in the pan and classifying the liquid amount into a plurality of liquid amount categories, the control means comprising: The pre-boiling temperature detection means is configured to detect the pre-boiling temperature. When the power is set, the set value of the electric power is lowered so as to become a value determined for each liquid volume section, and the temperature change value becomes equal to or less than the second predetermined value set for each liquid volume section. When the boiling detection means detects the boiling, control is performed to shift to the next process .

Accordingly, the liquid level detection means for detecting the liquid level in the pan and classifying it into a plurality of liquid volume classifications is provided, and the control means has a predetermined value before the boiling detection means detects the boiling by the temperature detection means before boiling. When the temperature is reached, the setting of the electric power supplied to the heating coil is lowered to a value determined for each liquid volume section, and the temperature change value is less than or equal to a second predetermined value set for each liquid volume section, and the boiling detection is performed. If means performs a boiling detection and thus to move to the next step.

  The induction heating apparatus of the present invention heats the heated object in a short time with high heating power up to the pre-boiling temperature detection condition, and reduces the power supplied to the heating coil when the pre-boiling temperature detection condition is satisfied. By suppressing the amount of heat applied to the liquid and detecting the boiling when the boiling detection condition is satisfied, the boiling of the object to be heated can be detected without being blown out.

1st invention is a heating coil which heats a pan, a top plate which mounts a pan in the upper part of a heating coil, a control means which controls electric power supplied to a heating coil, and infrared rays which detect the amount of infrared rays from the pan Detecting means, temperature converting means for converting the temperature of the pan from the output of the infrared detecting means, and a temperature change value per unit time before boiling after heating converted by the temperature converting means is equal to or less than a first predetermined value. Whether the temperature change value is equal to or lower than the first predetermined value, and the temperature detection means before boiling to detect the temperature before boiling, and the temperature change value is smaller than the first predetermined value. detecting whether it is less than the second predetermined value, the boiling detection means for the temperature change value boils detected that falls below the second predetermined value, the plurality by detecting the amount of liquid in the inner bowl comprising a liquid amount detecting means for classifying the liquid volume segment, and the Control means, said boiling temperature before detecting means further said temperature variation value lowers the set value of the power at the time of the said boiling temperature before detected as a value that is determined for each of the liquid quantity indicator the liquid The amount of infrared rays radiated from the surface of the pan may be captured by controlling to move to the next step when the boiling detection means detects the boiling when the boiling detection means is below the second predetermined value set for each quantity category. It is possible to know the temperature accurately in a non-contact manner, and it is possible to detect the boiling accurately with the liquid volume, and it has reached the boiling detection temperature where the temperature change is stable during the boiling detection determination. However, since the amount of heat is not excessively applied to the pan and the pressure in the pan does not increase rapidly, boiling detection can be performed without spilling.

2nd invention detects the amount of infrared rays from the heating coil which heats a pan, the top plate which mounts a pan in the upper part of a heating coil, the control means which controls the electric power supplied to a heating coil, and the said pan and infrared detection means detects the temperature conversion means for converting the temperature of the pot from an output of said infrared detection means, whether or not the temperature of the temperature conversion unit has converted becomes a temperature of the Jo Tokoro, and the conversion temperature Temperature detection means for detecting the temperature before boiling when the temperature reaches the predetermined temperature, detecting whether the temperature change value is equal to or lower than a second predetermined value, and the temperature change value is the second temperature Boiling detection means for detecting boiling when a predetermined value or less, and liquid amount detection means for detecting the liquid amount in the pan and classifying it into a plurality of liquid volume categories, the control means before the boiling The temperature detecting means is
When the temperature before boiling is detected, the set value of the electric power is lowered so as to become a value determined for each of the liquid quantity categories, and the temperature change value is set to the second predetermined value set for each of the liquid quantity categories. By controlling to shift to the next process when the boiling detection means detects the boiling below, the amount of infrared rays emitted from the surface of the pan can be captured, and the temperature can be known accurately without contact. At the same time, it is possible to detect boiling with accuracy according to the amount of liquid, and the amount of heat is excessively applied to the object to be heated despite reaching the boiling detection temperature where the temperature change is stable during the detection of boiling. Since there is no loss and the pressure in the pan does not rise rapidly, boiling detection can be performed without spilling.

  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 shows a block diagram of an induction heating apparatus in the first embodiment of the present invention.

In FIG. 1, the induction heating apparatus of the present embodiment includes a pan 1 that accommodates an object to be heated, a top plate 2 on which the pan 1 is placed, a heating coil 3 that generates electromagnetic induction and generates heat in the pan 1, and a heating coil 3. to an inverter 4 which supplies a high-frequency current in order to electromagnetic induction, infrared detector 5 for detecting the infrared rays from the pot 1, the temperature conversion means 6 for converting the temperature from infrared amount obtained by the infrared detector 5 , A pre-boiling temperature detection means 7, a boiling detection means 8, and a control means 9 are provided.

  About the induction heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated using FIG.2 and FIG.3 below.

  First, in order to supply power of 2000 W or more to the pan 1 placed on the top plate 2, the control means 9 controls the inverter 4 to generate a high-frequency current in the heating coil 3 (step S1). Do. When the pan 1 is heated, the amount of infrared rays emitted from the pan 1 increases, the amount of infrared rays emitted from the bottom of the pan 1 is measured by the infrared detecting means 5, and the temperature conversion means 6 starts converting the temperature of the pot 1 (step) At the same time as S2), observation of the time from the start of power supply is started (step S3). When the predetermined time txmin has elapsed (step S4), calculation of a temperature change value per unit time (ΔT / Δt) is started (step S5). Until the pre-boiling temperature detection condition that the temperature change value per unit time is smaller than a predetermined value is satisfied, the temperature change value per unit time is continuously calculated (step S5) and approaches the temperature near the boiling temperature. Since the temperature change value per unit time becomes smaller, when the temperature detection condition before boiling (≦ ΔTempX) is satisfied, it is determined that the temperature detection before boiling is completed (step S6), The supplied power is dropped to 1000 W or less (step S7). The condition value of the temperature change value per unit time must be determined by the power value that can be supplied. The temperature detection condition before boiling may be a predetermined temperature, and it is desirable to determine the condition based on a temperature of 95 ° C. or higher in order to shorten the time from the start point to the boiling detection. After the power is reduced to 1000 W or less (step S7), in order to calculate the temperature change value per unit time (step S9), the process waits until a predetermined time tymin elapses (step S8). When the predetermined time tymin has elapsed (step S8), calculation of a temperature change value per unit time (step S9) is started, and calculation of a temperature change value per unit time until the boiling detection condition is satisfied (step S10) (step S9). Continue. When the temperature change value per unit time falls within a boiling detection condition range (≦ ΔTempY) that is smaller than a predetermined value, it is determined that boiling detection is complete (step S10), and the heating mode is terminated (step S11). ), And shifts to the heat retention mode which is the next process (step S12).

  As described above, in this embodiment, when the pre-boiling temperature detection means 7 reaches the pre-boiling temperature detection condition, the control means 9 lowers the setting of the power supplied to the heating coil 3 and the boiling detection means 8 further. When boiling detection is performed when the boiling detection condition is reached, the amount of heat is added to the object to be heated despite reaching a temperature near the boiling detection temperature where the temperature change value is stable during boiling detection determination. Since the pressure in the pan does not rise rapidly, the boiling detection can be performed without spilling.

  Further, in the present embodiment, the pre-boiling temperature detecting means and the boiling detecting means are used, but since the boiling detecting means is not used, whether the temperature change value becomes a predetermined value or less by the pre-boiling temperature detecting means. The power or time supplied to the heating coil from the time when the pre-boiling temperature is detected is controlled based on the temperature change value detected by the pre-boiling temperature detection means. Detection can be performed.

In addition, the control means of the present embodiment sets the time for supplying power to the heating coil after the pre-boiling temperature detection time, the temperature change value from after heating to the pre-boiling temperature detection time, or from the heating to the pre-boiling temperature detection time. by providing a limit based on the time required for, will be made to serve as temporal limiter, it is possible to improve the safety in boiling detection.

In addition, the control means of the present embodiment performs heating for a certain period of time after the detection of boiling based on the temperature change value from the time of heating to the time of temperature detection before boiling or the time required from the time of heating to the time of temperature detection before boiling. By increasing the electric power supplied to the coil, the amount of heat is applied to the object to be heated after detecting the boiling not to be spilled, so that it is possible to extend the time to be stopped after boiling and to improve usability.

(Embodiment 2)
FIG. 4 is a block diagram showing an induction heating device in the second embodiment of the present invention.

  In FIG. 4, the induction heating apparatus of a present Example is the pan 1 which accommodates to-be-heated object, the top plate 2 which mounts the pan 1, the heating coil 3 which electromagnetic induction generate | occur | produces and heats the pan 1, and the heating coil 3 An inverter 4 for supplying a high-frequency current for electromagnetic induction, an infrared detection means 5 for detecting an infrared signal from the pan 1, a temperature detection means 6 for calculating the temperature from the amount of infrared rays obtained by the infrared detection means 5, Pre-boiling temperature detection means 7, boiling detection means 8, control means 9, and liquid amount detection means 10 are provided.

  About the induction heating apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below using FIG.5 and FIG.6.

  First, in order to supply power of 2000 W or more to the pan 1 placed on the top plate 2, the control means 9 controls the inverter 4 to generate a high-frequency current in the heating coil 3 (step S101), and the pan 1 is heated. Do. When the pan 1 is heated, the amount of infrared rays emitted from the pan 1 increases, the amount of infrared rays emitted from the bottom of the pan 1 is measured by the infrared detecting means 5, and the temperature conversion means 6 starts calculating the temperature of the pan 1 (step At the same time, the observation of the time from the start of power supply is started (step S103). The liquid volume detection means 10 performs a liquid volume determination process (determined by the time required for the temperature rise from a certain temperature arrival time to a certain temperature arrival time), and classifies the liquid volume of the object to be heated into several categories ( Step S104). When a predetermined time txmin set for each liquid quantity category has elapsed (step S105), calculation of a temperature change value per unit time set for each liquid quantity category (ΔT / Δt) is started (step S106). Calculation of the temperature change value per unit time set for each liquid quantity category until the pre-boiling temperature detection condition set for each liquid quantity category that the temperature change value per unit time is smaller than a predetermined value (step S106) ) Is continued and the temperature change value per unit time decreases as the temperature approaches the boiling temperature, so it is within the pre-boiling temperature detection condition range (≦ ΔTempX) set for each liquid volume category. When it is determined that the temperature detection before boiling has been completed (step S107), the power supplied for heating the pan 1 is reduced to the power value set for each liquid volume category (step S108). After the power was reduced to the power value for each liquid volume category (step S108), the temperature change value per unit time set for each liquid volume category was calculated (step S110). Wait until a predetermined time tymin has elapsed (step S109). When a predetermined time tymin set for each liquid volume section has elapsed (step S8), calculation of a temperature change value per unit time set for each liquid volume section (step S110) is started, and the boiling detection condition is satisfied (step S111). The calculation of the temperature change value per unit time set for each liquid volume category is continued (step S110). When it is within the boiling detection condition range (≦ ΔTempY) set for each liquid quantity category, it is determined that the boiling detection is completed (step S111), the heating mode is ended (step S112), and the next process is the heat retention mode. Transition is made (step S113).

  As described above, in the present embodiment, when the pre-boiling temperature detection means 7 reaches the pre-boiling temperature detection condition, the control means 9 lowers the setting of the electric power supplied to the heating coil 3, and further the boiling detection means 8 In this specification, in which boiling detection is performed when the boiling detection condition is reached, it is possible to set each constant for each liquid volume category obtained by the liquid volume detection means 10, so that the time until the boiling detection is short is small. The system is also suitable for situations where there is a large amount of object to be heated and there is little air in the pan 1 and it is easy to lift the lid due to the pressure in the pot. Can be built.

  It is also possible to determine the liquid amount determination process by determination based on a temperature after a predetermined time has elapsed since a certain temperature reached.

  Further, in the present embodiment, the pre-boiling temperature detecting means and the boiling detecting means are used, but since the boiling detecting means is not used, whether the temperature change value becomes a predetermined value or less by the pre-boiling temperature detecting means. The power or time supplied to the heating coil from the time when the pre-boiling temperature is detected is controlled based on the temperature change value detected by the pre-boiling temperature detection means. Detection can be performed.

In addition, the control means of the present embodiment sets the time for supplying power to the heating coil after the pre-boiling temperature detection time, the temperature change value from after heating to the pre-boiling temperature detection time, or from the heating to the pre-boiling temperature detection time. by providing a limit based on the time required for, will be made to serve as temporal limiter, it is possible to improve the safety in boiling detection.

In addition, the control means of the present embodiment performs heating for a certain period of time after the detection of boiling based on the temperature change value from the time of heating to the time of temperature detection before boiling or the time required from the time of heating to the time of temperature detection before boiling. By increasing the electric power supplied to the coil, the amount of heat is applied to the object to be heated after detecting the boiling not to be spilled, so that it is possible to extend the time to be stopped after boiling and to improve usability.

  As described above, the induction heating device according to the present invention sets the power supplied to the heating coil when the temperature detection condition before boiling is satisfied, and performs boiling detection when the boiling detection condition is satisfied. Since it is possible to detect the boiling of the object to be heated without any problem, it can be applied to uses such as a heating device such as a jar pot or a gas range using an infrared sensor that detects a temperature change value with high accuracy.

The block diagram which shows the induction heating apparatus in Embodiment 1 of this invention The figure which shows the heating process of the to-be-heated material of the induction heating apparatus in Embodiment 1 of this invention. The flowchart which shows operation | movement of the induction heating apparatus in Embodiment 1 of this invention. The block diagram which shows the induction heating apparatus in Embodiment 2 of this invention. The flowchart which shows operation | movement of the induction heating apparatus in Embodiment 2 of this invention. The parameter figure regarding the conditions of the induction heating apparatus in Embodiment 2 of this invention Block diagram showing an induction heating device in a conventional example

Explanation of symbols

1 Pan 2 Top plate 3 Heating coil 4 Inverter 5 Heat detection means (infrared detection means)
6 Temperature conversion means 7 Pre-boiling temperature detection means 8 Boiling detection means 9 Control means 10 Liquid amount detection means 101 Pan 102 Top plate 103 Heating coil 104 Inverter 105 Transmission part 106 Protection part 107 Infrared detection means 108 Temperature detection means 109 Control means

Claims (2)

A heating coil for heating the pan, a top plate for placing the pan on the top of the heating coil, a control means for controlling the power supplied to the heating coil, an infrared detection means for detecting the amount of infrared rays from the pan, and Whether the temperature conversion means for converting the temperature of the pan from the output of the infrared detection means, and whether the temperature change value per unit time before boiling after heating converted by the temperature conversion means is equal to or less than a first predetermined value. And a pre-boiling temperature detecting means for detecting a pre-boiling temperature when the temperature change value becomes equal to or less than the first predetermined value, and a second predetermined value whose temperature change value is smaller than the first predetermined value. A boiling detection means for detecting boiling when the temperature change value is equal to or lower than the second predetermined value, and detecting a liquid amount in the pan to detect a plurality of liquid amounts. comprising a liquid amount detecting means for classifying the classification, and the control hand , The boiling temperature before detecting means, the boiling temperature before detecting the was the power setting at the time down to a value that is determined for each of the liquid volume segment further said temperature variation value is the liquid volume segment An induction heating apparatus that controls to move to the next step when the boiling detection means detects the boiling when the boiling detection means detects the boiling below the second predetermined value set every time . A heating coil for heating the pan, a top plate for placing the pan on the top of the heating coil, a control means for controlling the power supplied to the heating coil, an infrared detection means for detecting the amount of infrared rays from the pan, and temperature conversion means for converting the temperature of the pot from an output of the infrared detection means, the detected temperature of the temperature conversion unit is converted is whether it is a temperature of the Jo Tokoro, the conversion temperatures within the predetermined temperature a and boiling temperature before detecting means for the boiling temperature before detection, to detect whether the temperature change value is equal to or less than a second predetermined value, the temperature change value is less than the second predetermined value Boiling detection means for detecting boiling , and liquid amount detection means for detecting the liquid amount in the pan and classifying it into a plurality of liquid amount categories, the control means, the temperature detection means before boiling, When the temperature before boiling is detected, the power is set. Said boiling detection means the boiling detection becomes a value below the second predetermined value, further the temperature change value lowered so that the value determined is set for each of the liquid volume divided for each of the liquid volume segment Then, an induction heating device that controls to move to the next process.

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