WO2011096216A1

WO2011096216A1 - Induction cooker and control method for same

Info

Publication number: WO2011096216A1
Application number: PCT/JP2011/000601
Authority: WO
Inventors: さつき青山; 弘志中澤; 新太郎野口; 忠明伊東
Original assignee: パナソニック株式会社
Priority date: 2010-02-03
Filing date: 2011-02-03
Publication date: 2011-08-11
Also published as: JP5681119B2; JPWO2011096215A1; JP5684153B2; JPWO2011096217A1; JP5684152B2; WO2011096213A1; WO2011096215A1; WO2011096217A1; JPWO2011096213A1; JP5592410B2; JP5675657B2; JPWO2011096216A1; JPWO2011096214A1; WO2011096214A1

Abstract

When a scorch detection unit (6) detects that an output voltage corresponding to the temperature of the bottom surface of a pot (1), said output voltage being output by an infrared sensor (5) which detects infrared rays, increases to at least a second output voltage, a first scorch detection operation is carried out which detects scorched food stuck to the bottom of the pot (1), and if scorched food is detected stuck to the bottom of the pot, scorch information is output to a control unit (9). If scorch information is output during operations in heating mode, in which the control unit (9) supplies high frequency current to an induction coil (3), the control unit (9) suspends heating operations or suppresses heating output. The scorch detection unit (6) carries out the first scorch detection operation if an output setting value changes from outside a predetermined output setting range in which the first scorch detection operation is suspended, to a predetermined output range in which the first scorch detection operation functions.

Description

Induction heating cooker and control method thereof

The present invention relates to an induction heating cooker having a scoring detection function and a control method thereof.

A cooking device according to the prior art having a burn-in detection function detects that the food has been burned on the bottom of the pan from a temperature rise of a sensor that detects the temperature of the bottom of the pan in a specific cooking mode such as a stewed cooking mode. (For example, refer to Patent Document 1).

FIG. 5 is a block diagram showing a part related to the burn-in detection function in the induction heating cooker according to the prior art described in Patent Document 1, and FIG. 6 relates to the prior art described in Patent Document 1. It is a flowchart which shows operation | movement of an induction heating cooking appliance. The induction heating cooking appliance which concerns on a prior art is demonstrated using FIG.

5, the operation unit 100 includes a heating start key 101 and a control mode selection unit 102. In FIG. 6, in step S301, the power is turned on using the power switch 105, and the process proceeds to step S302. In step S302, an operation mode is selected using the control mode selection unit 102, and the process proceeds to step S303. When the heating start key 101 is turned on in step S303, the process proceeds to step S304. If the operation mode selected in step S302 is the stew mode in step S304, the process proceeds to step S306, and the control unit 103 instructs the burn detection unit 104 to operate the burn detection function. When the burning detection unit 104 detects burning, the control unit 103 reduces the heating output or stops the heating operation. Further, in step S302, when a heating mode other than the stew mode is selected, for example, when the user sets the heating output and heats, the process proceeds from step S304 to step S305, and the control unit 103 causes the scoring detection unit 104 to Output to stop burnt detection function.

JP-A-10-149875

However, according to the configuration of the induction heating cooker according to the prior art, the cooking mode in which the burn detection function operates is limited to stewed cooking. Therefore, the user has a problem that the stew mode must be selected when using the burn-in detection function.

The object of the present invention is to solve the problems of the prior art, even when the user performs cooking in a heating mode in which the user sets and heats the heating without selecting a specific cooking mode, An object of the present invention is to provide an induction heating cooker that can use the burn-in detection function and that can function normally without malfunction during cooking and a control method thereof.

An induction heating cooker according to the present invention, a top plate for placing a pan, an inverter provided under the top plate, including an induction heating coil for heating the pan, and provided under the top plate, An infrared sensor that detects infrared rays radiated from the bottom of the pan and transmitted through the top plate and outputs an output voltage corresponding to the bottom temperature of the pan, and the cooked food is burned on the bottom of the pan based on the output voltage. A high-frequency current is supplied to the induction heating coil, a burn-out detection unit that outputs burn-in information upon detection of the occurrence, an output setting unit for selecting one output set value from a plurality of output set values, and And controlling the heating operation of the inverter so that the heating output becomes a heating output corresponding to the selected output setting value, and the output setting unit An induction having a heating mode that is a control mode in which an output set value can be changed, and a controller that stops the heating operation or suppresses the heating output when the burn information is output during operation in the heating mode. In the cooking device, the burn-in detection unit increases the output voltage to a predetermined second output voltage value or more only when the selected output setting value is a value within a predetermined output setting range. When this is detected, a first burn detection operation is performed to detect that the cooked product has burned to the bottom of the pan, and the output set value is within the predetermined output set range from a value outside the predetermined output set range. When the value is changed, the first burn-in detection operation is performed.

This prohibits or performs the first burn detection operation according to the output setting value selected by the user, so that it can be used for high-power cooking represented by boiling water or stir-fry, or for cooking that you want to burn. In this case, false detection of scorching can be avoided. In addition, when the user changes the output set value from high output cooking that does not require the burnt detection function to low output cooking that requires the burnt detection function, the burnt detection function is performed by performing the first burnt detection operation. Since it can be worked, the user can continue cooking without a sense of incongruity.

In the induction heating cooker according to the present invention, the burn-in detection unit heats the selected output setting value within the predetermined output setting range, and the output voltage becomes equal to or higher than the second output voltage value. If the voltage drops below the second output voltage value during the continuation, the first burn-in detection operation is performed again. Therefore, for example, when the pan is hot at the start of heating, or when the output set value is changed within the predetermined output setting range from the setting of higher output than the predetermined output setting range, the output voltage is the second output. Even when a load (cooking material) is thrown into the pan while the heating is continued at a voltage value or higher, the first scoring detection operation is performed again, so that scoring can be accurately detected.

According to the induction heating cooker of the present invention, since the burn-in detection operation is prohibited or performed according to the output setting value selected by the user, the user can perform heating without selecting a specific cooking mode. Even when cooking is performed in the heating mode in which the output is set and heated, the burn detection function can be used, and there is no malfunction during cooking, and cooking can be performed without a sense of incongruity.

It is a block diagram of the induction heating cooking appliance which concerns on

Embodiment

1, 2, and 3 of this invention. It is a flowchart which shows the heat processing in the heating mode of the induction heating cooking appliance which concerns on

Embodiment

1, 2, and 3 of this invention. It is a graph of the output voltage curve of the infrared sensor 5 in Embodiment 2 of this invention. It is a graph of the output voltage curve of the infrared sensor 5 in Embodiment 3 of this invention. It is a block diagram of the part relevant to the burning detection function in the induction heating cooking appliance which concerns on a prior art. It is a flowchart which shows operation | movement of the induction heating cooking appliance which concerns on a prior art.

A first invention is a top plate for placing a pan, an inverter provided under the top plate and including an induction heating coil for heating the pan, a bottom plate of the pan provided under the top plate An infrared sensor that detects infrared rays emitted from the top plate and outputs an output voltage corresponding to the bottom temperature of the pan, and detects that the food is burned on the bottom of the pan based on the output voltage Then, a burn detection unit that outputs burn information, an output setting unit for selecting one of the output setting values from a plurality of output setting values, a high frequency current to the induction heating coil, and a heating output The heating operation of the inverter is controlled so that the heating output corresponding to the selected output setting value is obtained, and the output setting value is changed by the output setting unit. An induction heating cooker having a heating mode, which is a possible control mode, and a control unit that stops the heating operation or suppresses the heating output when the burn information is output during operation in the heating mode. The burn-in detection unit detects that the output voltage has increased to a predetermined second output voltage value or more only when the selected output setting value is a value within a predetermined output setting range. A first burn detection operation is performed to detect that the cooked food has burned to the bottom of the pan, and the output setting value is changed from a value outside the predetermined output setting range to a value within the predetermined output setting range. The first burn-in detection operation is performed. Therefore, since the first burn detection operation is performed only when the output set value is a value within a predetermined output setting range, the burn detection function can be stopped in a cooking scene that does not require the burn detection function. . For example, when vegetables are heated at high output, the difference between the temperature of the pot and the temperature of the vegetables becomes large, and the temperature of the pot tends to be high, so that misdetection of scorching is likely to occur. Thus, such a false detection can be avoided. For this reason, in the cooking in which the user changes the output setting value such as the heating mode and performs heating without selecting a specific mode such as the stew mode, the burning becomes worse by using the burning detection function. Can be prevented. In addition, during the cooking, the output setting value is changed from a value outside the predetermined output setting range where the first burn detection operation is not performed to a value within the predetermined output setting range where the first burn detection operation is performed. Since the first burn-in detection operation is performed, the user can use the burn-in detection function without a sense of incongruity in normal cooking in the heating mode.

In a second aspect of the invention, in particular, in the induction heating cooker of the first aspect of the invention, when the burn detection unit is performing the first burn detection operation, the output set value is the predetermined output setting. When it is changed to another output set value within the range, the first burn detection operation is continued. Therefore, even when the output set value is changed to a different output set value within a predetermined output set range, it can be continuously performed without performing the first burn-in detection operation. Thus, burnout detection can be performed accurately using output voltage information that has already been detected. In addition, since the output voltage information that has already been detected can be used, it is not determined that the heating has started at a high temperature, and the range in which the burn-in detection function can be used is broadened compared to the conventional technology, so that the user convenience is improved.

According to a third aspect of the invention, in particular, in the induction heating cooker of the first aspect, the burn-in detection unit detects the first burn-in when the selected output set value is larger than the predetermined output set range. When the operation is prohibited and the output set value is changed from a value greater than the predetermined output set range to a value within the predetermined output set range, the output voltage is greater than or equal to the second output voltage value. While prohibiting the first burn detection operation, when the output voltage is less than the second output voltage value, the first burn detection operation is performed. Thus, even when the output setting value that is larger than the predetermined output setting range and does not perform the first burn detection operation is changed to an output setting value within the predetermined output setting range that requires the burn detection function, It is possible to use the scoring detection function while avoiding misdetection of scoring at the start of heating in the apparatus.

In a fourth aspect of the invention, in particular, in the induction heating cooker of the first aspect of the invention, the burn-in detector is configured such that the output voltage is the second when the selected output setting value is smaller than the predetermined output setting range. When it is detected that it has increased beyond a predetermined third output voltage value smaller than the output voltage value, a second burn detection operation is performed to detect that the food has burned to the bottom of the pan, and the output set value is When the output voltage is changed from a value smaller than a predetermined output setting range to a value within the predetermined output setting range, the first burn-in detection operation is prohibited when the output voltage is equal to or higher than the second output voltage value. The first burn-in detection operation is performed when the output voltage is less than the second output voltage value. Therefore, accurate scoring detection is possible without malfunction.

In a fifth aspect of the invention, in the induction heating cooker of the first aspect of the invention, in particular, the scorch detection unit is configured such that the selected output setting value is within the predetermined output setting range, and the output voltage is the first output. After the voltage value is equal to or higher than the voltage value, the first burn-in detection operation is performed again when the voltage drops below the second output voltage value. Therefore, accurate scoring detection becomes possible.

In a sixth aspect of the invention, in particular, in the induction heating cooker of the first or fifth aspect of the invention, the burn-in detection unit detects the output voltage when the selected output setting value is smaller than the predetermined output setting range. When the temperature becomes equal to or higher than the second output voltage value and falls below the third output voltage value while heating is continued, the first burn-in detection operation is performed again. Therefore, the first burn-in detection operation can be automatically started in consideration of the case where a load (cooked food) is put into the pan even after the burn-in has been detected. improves.

A seventh invention is a top plate for placing a pan, an inverter provided under the top plate and including an induction heating coil for heating the pan, and a bottom plate of the pan provided under the top plate. An infrared sensor that detects infrared rays emitted from the top plate and outputs an output voltage corresponding to the bottom temperature of the pan, and detects that the food is burned on the bottom of the pan based on the output voltage Then, a burn detection unit that outputs burn information, an output setting unit for selecting one of the output setting values from a plurality of output setting values, a high frequency current to the induction heating coil, and a heating output The heating operation of the inverter is controlled so that the heating output corresponding to the selected output setting value is obtained, and the output setting value is changed by the output setting unit. Control of an induction heating cooker having a heating mode, which is a possible control mode, and a controller that stops the heating operation or suppresses the heating output when the burn information is output during operation in the heating mode In the method, the burn-in detection unit detects that the output voltage has increased to a predetermined second output voltage value or more only when the selected output setting value is a value within a predetermined output setting range. When detected, a first burn detection operation is performed to detect that the food has burned to the bottom of the pan, and the output set value is changed from a value outside the predetermined output set range to a value within the predetermined output set range. When changed, the method includes a step of performing the first burn-in detection operation.

According to an eighth aspect of the invention, in particular, in the control method for an induction heating cooker according to the seventh aspect of the invention, when the burn-in detection unit is performing the first burn-in detection operation, the output set value is the predetermined value. When the output setting value is changed to another output setting value within the output setting range, the step of continuing the first burn-in detection operation is further included.

According to a ninth aspect of the invention, in the control method for an induction heating cooker according to the seventh aspect of the invention, when the burn-out detection unit has the selected output set value larger than the predetermined output set range, the first When the burnout detection operation is prohibited and the output set value is changed from a value greater than the predetermined output set range to a value within the predetermined output set range, the output voltage is greater than or equal to the second output voltage value. When the output voltage is less than the second burnout voltage, the first burnout detection operation is prohibited, and when the output voltage is less than the second output voltage value, the first burnout detection operation is further included.

According to a tenth aspect of the invention, in particular, in the control method for an induction heating cooker according to the seventh aspect of the invention, the burn-in detection unit detects the output voltage when the selected output setting value is smaller than the predetermined output setting range. When it is detected that it has increased beyond a predetermined third output voltage value smaller than the second output voltage value, a second scoring detection operation is performed to detect that the food has scorched on the bottom of the pan, and the output set value Is changed from a value smaller than the predetermined output setting range to a value within the predetermined output setting range, the first burn detection operation is performed when the output voltage is equal to or higher than the second output voltage value. On the other hand, when the output voltage is less than the second output voltage value, the method further includes the step of performing the first burning detection operation.

In an eleventh aspect of the invention, in particular, in the control method for an induction heating cooker according to the seventh aspect of the invention, the burn-in detection unit is configured such that the selected output setting value is within the predetermined output setting range, and the output voltage is The method further includes the step of performing the first burn-in detection operation again when the temperature becomes equal to or higher than the second output voltage value and falls below the second output voltage value while heating is continued.

In a twelfth aspect of the invention, in the control method for an induction heating cooker according to the seventh or eleventh aspect of the invention, when the burnt detection unit has the selected output setting value smaller than the predetermined output setting range, When the output voltage becomes equal to or higher than the third output voltage value and falls below the third output voltage value while heating is continued, the method further includes the step of performing the second burn detection operation again.

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 block diagram of an induction heating cooker according to Embodiments 1 to 3 of the present invention.

1 The induction heating cooker in FIG. 1 has a scoring detection function. In FIG. 1, the pan 1 is placed on the top plate 2, and the induction heating coil 3 is provided below the top plate 2. The output setting unit 7 includes an up key 10 that increases the output set value P corresponding to the heating output of the induction heating coil 3 by one step, and a down key 11 that decreases the output set value P by one step. The user can select one output set value P from among a plurality of output set values P of the induction heating coil 3 using the output setting unit 7. Inverter 4 includes a switching element (not shown), a resonant capacitor (not shown), and induction heating coil 3. When the output setting value P is selected by the output setting unit 7, the control unit 9 controls the switching elements constituting the inverter 4 so that the heating output becomes a value corresponding to the selected output setting value P. A high-frequency current having a required magnitude is supplied to the induction heating coil 3. A commercial power supply is input to the inverter 4. The induction heating coil 3 generates a high frequency magnetic field when a high frequency current is supplied. When the high-frequency magnetic field is linked to the bottom surface of the pan 1, an eddy current is induced on the bottom surface of the pan 1, and the eddy current generates Joule heat and the bottom surface is inductively heated. Furthermore, infrared rays radiated from the bottom of the pan 1 and transmitted through the top plate 2 are detected by the infrared sensor 5 provided below the top plate 2, and the output voltage V corresponding to the bottom temperature of the pan 1 is detected by the voltage detector 8. Is output. Further, the voltage detection unit 8 detects the output voltage V and outputs the detection result to the burn detection unit 6. The scoring detection unit 6 detects that the food is scorched on the inner bottom of the pan 1 based on the output voltage V output from the infrared sensor 5 and detected by the voltage detection unit 8, and provides scoring information indicating the scoring. Output to the control unit 9. The control unit 9 supplies a high-frequency current to the induction heating coil 3 and controls the heating operation of the inverter 4 so that the heating output becomes a heating output corresponding to the selected output setting value P, and the output setting unit 7 outputs the heating operation. It has a plurality of operation modes including a heating mode which is a control mode in which the set value P can be changed, and when the burnt information is output during operation in the heating mode, the heating operation is stopped or the heating output is suppressed. In addition, the induction heating cooker of FIG. 1 has a selection means (not shown) for the user to select an operation mode, and a heating key (not shown) for the user to instruct the start of the heating operation. Is provided.

It should be noted that the element for detecting the temperature of the bottom surface of the pan 1 is a pan by measuring the amount of infrared rays from the pan 1 rather than a thermistor that contacts the back surface of the top plate 2 and detects the back surface temperature of the top plate 2. It is preferable to use an infrared sensor 5 that can directly detect the bottom surface temperature of 1. The infrared sensor 5 detects infrared rays transmitted through the top plate 2 such as an InGaAs pin photodiode, a silicon photodiode, and a thermopile, and the temperature from the start of heating the cooked food in the pan 1 to when the cooked food burns. Any device capable of detecting a temperature within the range may be used. The output voltage V of the infrared sensor 5 is a power function (V = aT ^b ) (a is a positive real number, and b is a positive real number of 6 to 9, for example, as the bottom temperature of the pan 1 increases. And T is the bottom temperature of the pan 1).

Referring to FIG. 2, the operation and action of the induction heating cooker configured as described above will be described.

FIG. 2 is a flowchart showing the heating process in the heating mode of the induction heating cooker according to the first to third embodiments of the present invention.

In FIG. 2, first, in step S10, the control unit 9 determines whether or not the heating mode is selected by the user and the heating key is turned on. If YES, the process proceeds to step S11. If so, the process of step S10 is repeated. In step S11, the control unit 9 starts the heating operation with the selected output set value P. Next, in step S12, the burning detection unit 6 determines whether or not the output set value P is within a predetermined output set range. If YES, the process proceeds to step S13. On the other hand, if NO in step S12, the process proceeds to step S21.

Furthermore, in step S13, the burn-in detection unit 6 inputs an output voltage V corresponding to the bottom temperature of the pan 1 detected by the infrared sensor 5 through the voltage detection unit 8, and the output voltage V is a predetermined second output. It is determined whether or not the voltage value is less than V2. If YES, the process proceeds to step S16. If NO, the process proceeds to step S26. The voltage detector 8 converts an analog voltage into a digital voltage, for example. Note that the process of step S13 is referred to as an initial output voltage determination process. In step S16, the burn-in detection unit 6 determines whether or not the output setting value P has been changed outside the predetermined output setting range. If YES, the process returns to step S12. If NO, the process proceeds to step S17. Furthermore, in step S17, the burn detection unit 6 determines whether or not the output voltage V is equal to or higher than a predetermined second output voltage value V2. If YES, the process proceeds to step S19. If NO, step S16 is performed. Returning to step S16, steps S16 and S17 are repeated. In step S <b> 19, the burn detection unit 6 outputs burn information indicating that the cooked product has burned to the bottom of the pot 1 to the control unit 9 (confirmed burn). In response to this, in step S20, the controller 9 stops the heating operation or suppresses the heating output and ends the heating process. The processes in steps S13, S16, and S17 are referred to as a first burn detection operation. In the first burn detection operation, the burn detection unit 6 detects that the output voltage V has increased to the second output voltage value V2 or more when the output set value P is within a predetermined output set range. Detect that the food is burnt.

Further, in step S21 of FIG. 2, the scoring detection unit 6 determines whether or not the output setting value P is smaller than a predetermined output setting range. If YES, the process proceeds to step S23. If NO, step S26 is performed. Proceed to In step S23, the burn detection unit 6 determines whether or not the output voltage V is less than the third output voltage value V3. If YES, the process proceeds to step S24. If NO, the process proceeds to step S26. In addition, the process of step S23 is called initial output voltage determination process similarly to the process of step S13. Next, in step S24, the burning detection unit 6 determines whether or not the output set value P has been changed. If YES, the process returns to step S12. If NO, the process proceeds to step S25. In step S25, the burn detection unit 6 determines whether or not the output voltage V is equal to or higher than a predetermined third output voltage value V3. If YES, the process proceeds to step S19. If NO, steps S24 and S25 are performed. Repeat the process. Note that the processing in steps S23 to S25 is referred to as second scoring detection operation. In the second burn detection operation, the burn detection unit 6 causes the output voltage V to be equal to or higher than the third output voltage value V3, which is smaller than the second output voltage value V2, when the output set value P is smaller than a predetermined output set range. When the increase is detected, it is detected that the cooked food has burned to the bottom of the pan.

Furthermore, in step S26 in FIG. 2, the burn-in detection unit 6 continues the heating operation without prohibiting the first and second burn-in detection operations, and proceeds to step S27. In step S27, the burn-in detection unit 6 determines whether or not the output set value P has been changed. If NO, the process proceeds to step S28. If YES, the process returns to step S12. In step S28, the scoring detection unit 6 determines whether or not the output voltage V is less than a predetermined second output voltage value V2. If NO, the processes of steps S27 and S28 are repeated. If YES in step S28, the process returns to step S12.

As will be described in detail later, the third output voltage value V3 is set to a predetermined value smaller than the second output voltage value V2.

Next, the heating process of FIG. 2 when the output setting range used in steps S12, S16, and S21 is the range of the output setting value P corresponding to a heating output of 500 W or more and 1000 W or less will be specifically described. .

In FIG. 2, when heating cooking in the heating mode is selected in the operation mode selection before the heating is started and the heating key is turned on, the burn-in detection unit 6 sets the output set value P to a predetermined value in steps S12 and S21. Is within the output setting range (YES in step S12), smaller than the output setting range (YES in step S21), or larger than the output setting range (NO in step S21). In step S12, when the output setting value P set by the output setting unit 7 is within the predetermined output setting range, the process proceeds to step S13.

On the other hand, if the output setting value P is smaller than the predetermined output setting range in step S21, the process proceeds to step S23. If the output setting value P is larger than the predetermined output setting range, the process proceeds to step S26, and the first and second steps are performed. The burnout detection operation is prohibited, the burnout detection function is disabled, and heating is continued.

For example, when the user selects an output setting value P corresponding to a heating output of 700 W by the output setting unit 7, the burn detection unit 6 determines that the selected output setting value P is a predetermined output setting in step S12. By detecting that the value is within the range, it is determined that cooking that needs to be performed with the first burn-in detection operation is performed, and in the case of YES in step S12, the first burn-in detection operation is started. . In addition, when the user selects the output setting value P corresponding to the heating output of 370 W by the output setting unit 7, the burning detection unit 6 determines that the selected output setting value P is the predetermined output setting in step S21. By detecting that the value is smaller than the range, it is determined that cooking with low output, which is generally concerned about burning, is executed. On the other hand, when the user selects the output setting value P corresponding to the heating output of 2000 W in the output setting unit 7, the burnout detection unit 6 determines that the selected output setting value P is larger than the predetermined output setting range. By detecting this, it is determined that high-power cooking such as stir-fried food or kettle has started, the process proceeds to step S26, the first and second burnt detection operations are prohibited and stopped, and cooking is continued. .

The predetermined output setting range set in advance considers the necessity of the burn-in detection operation, i.e., whether the output is cooked for which there is a concern that there is no burn, and malfunction is unlikely to occur. The heating output may be determined. In the above-described example, the range of the output set value P corresponding to the heating output of 500 W or more and 1000 W or less is set, but the present invention is not limited to this. The output setting value P larger than the preset output setting range is used in cooking at a high output setting such as boiling and stir-fry cooking that does not cause burning. When cooking at high output, it is considered that the user is often near the pan 1. Moreover, cooking at high output is also performed when the user wants to darken the food. In addition, when cooking at a high output, the detected output voltage V suddenly rises from a low output voltage at the start of heating to a high output voltage, so the temperature difference between the cooked item and the pan 1 becomes large. The temperature of No. 1 tends to be high, and in general, it is easy to falsely detect that it is burnt but not burnt, and it is necessary to stop the first and second burnt detection operations.

In the initial output voltage determination process of step S13, when the output voltage V corresponding to the bottom surface temperature of the pan 1 is less than the preset second output voltage value V2, the process proceeds to step S16 and the first burn detection operation I do. Further, in the soft pressure determination process with the initial output of step S23, when the output voltage V corresponding to the bottom surface temperature of the pan 1 is less than the preset third output voltage value V3, the process proceeds to step S24, and the second Detects burnt in. When the output voltage V is greater than or equal to the second output voltage value V2 in step S13, or when the output voltage V is greater than or equal to the third output voltage value V3 in step S23, the burn detection unit 6 performs the first and second burns. Prohibit detection operation. This prevents false detection of burning due to the high temperature of the cooked food when the first and second burning detection operations are started or when the heating output is changed. In this case, since the user is in front of the pan 1, the problem caused by prohibiting the burning detection operation is unlikely to occur.

If it is determined in step S16 that the output setting unit 7 has changed the output setting value P to another output setting value P within a predetermined output setting range (NO in step S16), the process continues. The first burn detection operation is performed and the process proceeds to step S17. On the other hand, when output set value P is changed to output set value P outside the predetermined output set range (YES in step S16), the process returns to step S12, which is the process immediately after the start of heating.

For example, when the user selects the output setting value P corresponding to the heating output of 700 W by the output setting unit 7, the burn-in detection unit 6 determines that the selected output setting value P is the predetermined setting output in step S12. By detecting that it is within the range, it is determined that cooking that requires performing the first burn detection operation is performed, and in the case of YES in step S13, the first burn detection operation is started. When the output set value P is changed to the output set value P corresponding to the heating output of 500 W, which is a value within the predetermined output set range, until the process proceeds to step S19, the process at the start of heating (step S12) The first burn-in detection operation is continued without returning to). For example, the user determines that the heating output is strong when cooking by boiling with the output setting value P corresponding to the heating output of 700 W, and changes the output setting value P to correspond to the heating output of 500 W. At this time, since the information on the output voltage V detected before the change of the output set value P can be used by continuously performing the first burn-in detection function, burn-in is detected accurately and with a simple control sequence. it can.

As described above, when the predetermined output setting value P within the predetermined output setting range is changed to another output setting value P within the predetermined output setting range, the first burn detection operation is continued. By doing so, it is possible to avoid false detection of burnt detection, and the user can continue cooking without a sense of incongruity.

Further, when the heating output is changed from 700 W to 2000 W during the first burn-out detection operation, it is determined YES in Step S16, and thus the process returns to Step S12 which is a process immediately after the start of heating. On the other hand, if the heating output is changed from 700 W to a heating output of 500 W or more and 1000 W or less corresponding to a predetermined output setting range during the first burning detection operation, the first burning detection operation is performed. Will continue. For example, when the heating output is changed from 700 W to 2000 W, without returning to the process immediately after the start of heating in step S12, and continuously performing the first burn-in detection operation, the output voltage V is increased by the heating output of 2000 W. Rises sharply and rises to the second output voltage value V2, which causes burned information to be output. Therefore, for example, when the user is cooking by boiling with 700 W heating output, when the heating output is increased to 2000 W in order to finally blow off the broth, before the user stops heating, the burn detection is performed. The unit 6 outputs burnt information, and the control unit 9 stops the heating operation or suppresses the heating output. However, according to the present embodiment, when the heating output is changed from 700 W to 2000 W corresponding to the output setting value P higher than the predetermined output setting range, the process returns to step S12 which is a process immediately after the start of heating. Therefore, it is determined NO in step S21, and the first burn detection operation is stopped, but the heating operation is continued, and the user can continue cooking.

In addition, when the heating output is changed from 700 W to 370 W during the first burn detection operation, it is determined YES in Step S16, so the process returns to Step S12, which is the process immediately after the start of heating, In steps S23 to S25, a second burn detection operation using the third output voltage value V3 is performed. The third output voltage value V3 is set in advance by measuring and setting in advance a value corresponding to scorching that occurs when cooking low-viscosity food that can occur in cooking when the pan 1 is heated slowly with low output. When heating at an output setting value P smaller than a predetermined output setting range, less power is consumed in the pan 1 than when heating at an output setting value P within the predetermined output setting range, and the temperature rises until it is burnt. While moderate, the temperature rise after scorching is rapid. For this reason, the third output voltage value V3 is smaller than the second output voltage in order to detect the scoring after the scoring has occurred earlier than the heating at the output setting value P within the predetermined output setting range. Set to a value. Therefore, when the heating output is changed from 700 W to 370 W, if the first burn detection operation is continued without returning to step S12, heating is performed until the second output voltage value V2 is reached, and the burned state deteriorates. Burn detection is not accurate. According to the present embodiment, when the output setting value P is changed to the output setting value P that is smaller than the predetermined output setting range, the burning detection unit 6 returns to step S12 and performs the second burning detection operation. It becomes possible to accurately detect scorching.

When the output setting value P is changed by the output setting unit 7 during the period from step S23 to step S25, YES is determined in step S24, and the process returns to step S12.

For example, when the user selects the output setting value P corresponding to the heating output of 370 W by the output setting unit 7, the burn detection unit 6 determines that the selected output setting value P is the predetermined setting output in step S21. By detecting that the value is smaller than the range, it is determined that cooking with low output, which is generally concerned about burning, is executed, and the second burning detection operation is started in step S23. However, if the output set value P is changed before the output voltage V reaches the third output voltage value V3, YES is determined in step S24, and the process returns to step S12.

For example, while the user is cooking with a heating output of 370 W, it is determined that the heating output to the food is insufficient, and the heating output is set to 500 W corresponding to the output setting value P within a predetermined output setting range. Suppose you raise it. At this time, when the second burn detection operation is continued without returning to the process immediately after the start of cooking in step S12, the output voltage value used for detecting burn is a third output voltage lower than the second output voltage value V2. In the state where the value V3 remains unchanged and there is no scoring, scoring is confirmed and scoring information is output, which causes a problem in cooking. On the other hand, according to the present embodiment, when the heating output is changed from 370 W to 500 W, the process returns to step S12, so the first burn detection operation using the second output voltage value V2 is performed, and the burn is accurately performed. It becomes possible to detect.

Suppose that the heating operation is started at the output set value P corresponding to 370 W and changed to the output set value P corresponding to 2000 W. During the heating operation at 370 W, when the output voltage V reaches the third output voltage value V3, the heating operation is stopped or the heating output is suppressed. For example, when cooking a carrot that is served in scattered sushi, etc., when cooking a relatively small amount of cooked food (load) and wanting to drain moisture at a high output, the user can increase the heating output from 370 W to 2000 W. Change to At the time of this change, if the second burn detection operation is continued without returning to the process of step S12, the detected output voltage V reaches the third output voltage value V3 while the moisture is being skipped, and the burn information is displayed. Since it is output, the heating operation is stopped or the heating output is suppressed, which causes a problem in cooking. On the other hand, according to the present embodiment, when the heating output is changed from 370 W to 2000 W, the process returns to step S12, NO is determined in step S21, and the first and second scoring operations are prohibited in step S26. Since the heating operation is continued, the user can continue cooking.

In step S21, when it is determined that the output set value P is larger than the predetermined output set range, the burn-in detection unit 6 does not prohibit and perform the first and second burn-in operations. Since the operation is continued, cooking can be continued. When the heating setting is changed in the output setting unit 7 while heating is performed while prohibiting the first and second burning operations (YES in step S27), the process returns to step S12.

For example, it is assumed that the user selects the output setting value P corresponding to the heating output of 2000 W by the output setting unit 7. In step S <b> 21, the burn detection unit 6 detects that the selected output setting value P is larger than a predetermined setting output range, and outputs information including the detection result to the control unit 9. The controller 9 prohibits the first and second burn detection operations and continues the heating operation. Thereafter, it is assumed that the heating output is changed from 2000 W to 700 W, which is the heating output within the range of the heating output in which the first burn-in detection operation is performed. For example, in the case of stir-fried foods such as such a cooking scene, the user stirs the food with high output and then puts the seasoning liquid into a smaller output for stew. Although the first and second burn detection operations are prohibited when the heating output is 2000 W, it is necessary to detect the burn when cooking with 700 W heating output. According to the present embodiment, when the heating output is changed from 2000 W to 700 W, the process returns to the process immediately after the start of heating in step S12 and the first burning operation is performed, so that the output voltage value V is the second output voltage. If it is less than the value V2 (YES in step S13), scoring can be detected.

Thereby, from the predetermined output setting value P in which the first and second burn-in detection operations are prohibited, such as when cooking at high output or when boiling water, the predetermined output setting range or the output setting range. Even if it is changed to a smaller output set value P, if the temperature of the pan 1 at the time of the change is not higher than the temperature at which the burn-in information is determined, the first or second burn-in at the changed output set value P The operation can be performed.

In step S17, when the output voltage V reaches the second output voltage value V2 set in advance, the burn detection unit 6 detects that burn has occurred and outputs burn information. In response to this, the control unit 9 performs control such as stopping the heating operation or reducing the heating output. Further, the setting value of the second output voltage value V2 is preferably set to a value corresponding to, for example, 160 ° C. in order to reduce the state of scoring, which can cause scoring. However, depending on the type of the pan 1, there may be cooking that detects scorching in the middle of cooking, so an optimal temperature (for example, 195 ° C.) that eliminates scoring misdetection and reduces the scoring state is set in advance. The output voltage V obtained by experiment and corresponding to the temperature may be set to the second output voltage value V2.

In the first burn detection operation, the processes of Step S16 and Step S17 are repeated until the output voltage V reaches the second output voltage value. Further, when the output setting value P is changed to a value outside the predetermined output setting range by the output setting unit 7 during the period from step S13 to step S17, YES is determined in step S16, and the process proceeds to step S12. Return.

In step S25, when the output voltage V corresponding to the bottom surface temperature of the pan 1 reaches the third output voltage value V3, the burning detection unit 6 detects that burning has occurred, and outputs burning information. In response to this, the control unit 9 performs control such as stopping the heating operation or suppressing (decreasing) the heating output.

When the scoring detection unit 6 determines that scoring has occurred inside the pan bottom and outputs scoring information, the control unit 9 stops the heating operation or suppresses (decreases) the heating output in step S20. The present invention is not limited to this. In step S20, the control unit may notify the user of burning by a predetermined display or a predetermined warning sound, and the process in step S20 is not limited to the heating output control.

Further, in the heating process of FIG. 2, the setting change is detected when the output set value P is changed, and the process returns to the process immediately after the start of heating in step S12. May be used.

(Embodiment 2)
FIG. 3 is a graph of the output voltage curve of the infrared sensor 5 according to Embodiment 2 of the present invention.

In FIG. 3, a curve 12 shows a time change of the output voltage V when the first burn detection operation is stopped when the output set value P is set to a value within a predetermined output set range. .

Description of the same parts as those in the first embodiment will be omitted, and different parts will be described.

In the first embodiment, when the burnout detector 6 detects that the output voltage V has increased to the second output voltage or higher when the output set value P is set to a value within a predetermined output set range, the pan A first burn detection operation is performed to detect that the cooked product has burned to the bottom of one pan. However, the pan 1 at the start of heating may be hot and the output voltage V may be equal to or higher than the second output voltage value V2. In this case, since the first burn detection operation is stopped, heating is continued with the output voltage V being the second output voltage value V2. For example, as shown in FIG. 3, at time t1, the user changes the output setting value P from a value (for example, 2000 W) larger than the predetermined output setting range to a value within the predetermined output setting range (for example, 500 W). The output voltage V may fall below the second output voltage value V2 from a state where the output voltage V exceeds the second output voltage value V2 due to reasons such as being changed and the food being stirred at the same time or water being added. . In the first scoring detection operation according to the present embodiment, the scoring detection unit 1 performs the first operation when the output voltage V is equal to or higher than the second output voltage value V2 with the first scoring detection stopped. When it is detected that the output voltage value is less than 2, the first burn detection operation is performed to detect whether or not the output voltage V reaches the second output voltage value V2 (step S28 in FIG. 2). YES → YES in step S12 → YES in step S13 → NO in step S16 → step S17). According to the present embodiment, when the output set value P is set to a value within the predetermined output set range, the first burn-in detection is stopped and the output voltage V is the second output voltage value V2. Even when the heating is continued as described above, the first burn-in detection operation is performed when it is detected that the output voltage value is less than the second output voltage value V2. Therefore, the first burn-in detection operation can be automatically performed, so that the usability of the user is improved. Accurate scoring can be detected without false detection.

(Embodiment 3)
FIG. 4 is a graph of an output voltage curve of the infrared sensor 5 according to Embodiment 3 of the present invention.

In FIG. 4, a curve 13 shows a time change of the output voltage V when the output set value P is set to a value smaller than a predetermined output set range and the second burn detection operation is stopped.

Description of the same parts as those in the first and second embodiments will be omitted, and different parts will be described.

In the first embodiment, the burnout detection unit 6 has a third output in which the output voltage V is smaller than the second output voltage value V2 when the output set value P is set to a value smaller than a predetermined output set range. When it is detected that the voltage value has increased to V3 or more, a second burn detection operation is performed to detect that the cooked food has burned to the bottom of the pot 1. However, the pan 1 at the start of heating may be hot and the output voltage V may be equal to or higher than the third output voltage value V3. In this case, since the first burn detection operation is stopped, heating is continued with the output voltage V being the second output voltage value V2. As shown in FIG. 4, at time t2, the user changes the output setting value P from a value within a predetermined output setting range (for example, 1000 W) to a value within a predetermined output setting range (for example, 370 W). At the same time, when a load such as cold water is put into the pan 1 and the temperature of the food is lowered, the output voltage V is set to a third output voltage value from a value equal to or higher than the third output voltage value V3, as shown in FIG. Decreases to a value below V3. In the present embodiment, the burn-in detection unit 6 has the third output voltage value V3 when the second burn-in detection operation is stopped and the output voltage V is equal to or higher than the third output voltage value V3. When it is detected that the output voltage has fallen below, the first burn-in detection operation is performed to detect whether or not the output voltage V reaches the third output voltage value V3 (YES in step S28 in FIG. 2 → NO in step S12). → YES in step S21 → NO in step S23 → NO in step S24 → step S25). According to the present embodiment, when the output set value P is set to a value smaller than the predetermined output set range, the second scoring detection is stopped and the output voltage V is the third output voltage value. Even if the heating is continued due to V3 or higher, the second burn detection operation is performed when it is detected that the output voltage value is less than the third output voltage value V3. Therefore, accurate burn detection is possible without false detection. It becomes.

As described above, when the output set value P is set to a value smaller than the predetermined output set range, heating is continued with the infrared sensor 5 detecting a value equal to or higher than the third output voltage value V3. Even when the cooking is done, it is determined that the cooked food (load) has been put into the pan 1 by detecting that the output voltage V has dropped below the third output voltage value V3. Since the burn-in detection operation can be performed, user convenience is improved.

As described above, the induction heating cooker and the control method thereof according to the present invention eliminates the misdetection of burning by discriminating the cooking scene desired by the user according to the output setting value selected by the user, and continues. Since cooking can be performed, it can be applied to uses such as a heating cooker in which burning occurs.

DESCRIPTION OF SYMBOLS 1 Pan 2 Top plate 3 Induction heating coil 4 Inverter 5 Infrared sensor 6 Burning detection part 7 Output setting part 8 Voltage detection part 9 Control part 10 Up key 11 Down key 12 Output setting value is set to a value within a predetermined output setting output range A curve showing the time change of the output voltage V when the first burnout detection operation is set. 13 The output set value is set to a value smaller than the predetermined output set output range. Curve showing the time change of the output voltage V when the first burn detection operation is stopped

Claims

A top plate on which the pan is placed;
An inverter provided under the top plate and including an induction heating coil for heating the pan;
An infrared sensor that is provided under the top plate, detects an infrared ray radiated from the bottom of the pan and transmitted through the top plate, and outputs an output voltage corresponding to the bottom temperature of the pan;
Based on the output voltage, when it is detected that the food is burnt on the bottom of the pan, a burnt detection unit that outputs burnt information;
An output setting unit for selecting one output setting value from a plurality of output setting values;
A high-frequency current is supplied to the induction heating coil and the heating operation of the inverter is controlled so that the heating output becomes a heating output corresponding to the selected output setting value, and the output setting value is changed by the output setting unit. The induction cooking device has a heating mode that is a possible control mode, and includes a control unit that stops the heating operation or suppresses the heating output when the burn information is output during operation in the heating mode. And
When the burn detection unit detects that the output voltage has increased beyond a predetermined second output voltage value only when the selected output setting value is a value within a predetermined output setting range, When a first burn detection operation for detecting that the cooked food has been burned is performed, and the output setting value is changed from a value outside the predetermined output setting range to a value within the predetermined output setting range, An induction heating cooker that performs the first burn detection operation.
If the output setting value is changed to another output setting value within the predetermined output setting range while performing the first burn detection operation, the burn detection unit performs the first burn The induction heating cooker according to claim 1, wherein the detection operation is continued.
The burnt detection unit is
When the selected output setting value is larger than the predetermined output setting range, the first burn detection operation is prohibited,
When the output set value is changed from a value larger than the predetermined output set range to a value within the predetermined output set range, the first output voltage is greater than or equal to the second output voltage value. 2. The induction heating cooker according to claim 1, wherein, when the burnout detection operation is prohibited, the first burnout detection operation is performed when the output voltage is less than the second output voltage value.
The burnt detection unit is
When the selected output setting value is smaller than the predetermined output setting range, upon detecting that the output voltage has increased beyond a predetermined third output voltage value smaller than the second output voltage value, Perform a second burn detection operation to detect that the food has burnt,
When the output set value is changed from a value smaller than the predetermined output set range to a value within the predetermined output set range, when the output voltage is equal to or greater than the second output voltage value, the first 2. The induction heating cooker according to claim 1, wherein, when the burnout detection operation is prohibited, the first burnout detection operation is performed when the output voltage is less than the second output voltage value.
The burn-in detection unit is configured such that the selected output set value falls within the predetermined output set range, the output voltage becomes equal to or higher than the second output voltage value, and the heating is continued to be less than the second output voltage value. 2. The induction heating cooker according to claim 1, wherein when the temperature decreases, the first burn-in detection operation is performed again.
When the selected output setting value is smaller than the predetermined output setting range, the burn detection unit is less than the third output voltage value while the output voltage is equal to or higher than the third output voltage value and heating is continued. 6. The induction heating cooker according to claim 1, wherein the second burn-in detection operation is performed again when the temperature is lowered.
A top plate on which the pan is placed;
An inverter provided under the top plate and including an induction heating coil for heating the pan;
An infrared sensor that is provided under the top plate, detects an infrared ray radiated from the bottom of the pan and transmitted through the top plate, and outputs an output voltage corresponding to the bottom temperature of the pan;
Based on the output voltage, when it is detected that the food is burnt on the bottom of the pan, a burnt detection unit that outputs burnt information;
An output setting unit for selecting one output setting value from a plurality of output setting values;
A high-frequency current is supplied to the induction heating coil and the heating operation of the inverter is controlled so that the heating output becomes a heating output corresponding to the selected output setting value, and the output setting value is changed by the output setting unit. Control of an induction heating cooker having a heating mode, which is a possible control mode, and a controller that stops the heating operation or suppresses the heating output when the burn information is output during operation in the heating mode A method,
When the burn detection unit detects that the output voltage has increased to a predetermined second output voltage value or more only when the selected output setting value is a value within a predetermined output setting range, When a first burn detection operation is performed to detect that the food is burnt, and the output setting value is changed from a value outside the predetermined output setting range to a value within the predetermined output setting range, A method for controlling an induction heating cooker, comprising the step of performing the first burn detection operation.
If the output setting value is changed to another output setting value within the predetermined output setting range while the burning detection unit is performing the first burning detection operation, the first burning is performed. The method for controlling an induction heating cooker according to claim 7, further comprising a step of continuing the detection operation.
The burn detection unit is
When the selected output setting value is larger than the predetermined output setting range, the first burn detection operation is prohibited,
When the output set value is changed from a value larger than the predetermined output set range to a value within the predetermined output set range, the first output voltage is greater than or equal to the second output voltage value. The induction heating cooking according to claim 7, further comprising a step of performing the first burn detection operation when the burn detection operation is prohibited while the output voltage is less than the second output voltage value. Control method.
The burn detection unit is
When the selected output setting value is smaller than the predetermined output setting range, upon detecting that the output voltage has increased beyond a predetermined third output voltage value smaller than the second output voltage value, Perform a second burn detection operation to detect that the food has burnt,
When the output set value is changed from a value smaller than the predetermined output set range to a value within the predetermined output set range, when the output voltage is equal to or greater than the second output voltage value, the first The induction heating cooking according to claim 7, further comprising a step of performing the first burn detection operation when the burn detection operation is prohibited while the output voltage is less than the second output voltage value. Control method.
The scoring detection unit detects that the selected output setting value is within the predetermined output setting range, the output voltage becomes equal to or higher than the second output voltage value, and the heating is continued to be less than the second output voltage value. The method of controlling an induction heating cooker according to claim 7, further comprising a step of performing the first burn-in detection operation again when the temperature is lowered.
When the burnout detection unit has the selected output setting value smaller than the predetermined output setting range, the output voltage becomes equal to or higher than the third output voltage value, and the heating is continued and less than the third output voltage value. The method for controlling an induction heating cooker according to claim 7 or 11, further comprising the step of performing the second burn-in detection operation again when the temperature is lowered.