JP5642428B2 - Electromagnetic cooker - Google Patents

Description

  The present invention relates to an electromagnetic cooker in which a cooking utensil generates heat by an electromagnetic induction effect generated by an electric current flowing in an exciting coil, and oil in the cooking utensil can be heated to make a fried food or the like.

  The electromagnetic cooker includes an exciting coil wound in a flat shape so as to correspond to the bottom surface of the cooking vessel (also referred to as pan) on the lower side of the top plate of the electromagnetic cooking device on which the cooking vessel (also referred to as pan) is placed. There is an electromagnetic cooker in which cooking utensils generate heat due to electromagnetic induction caused by the current flowing in the exciting coil, and the oil in the cooking utensils can be heated to make fried foods (see Patent Document 1). In this case, when using an electromagnetic cooker, a cooking container (also referred to as a pan) that generates heat satisfactorily by electromagnetic induction is required, so that a recommended pan is usually specified for each electromagnetic cooker. In particular, when fried (general name including both tempura and fried foods), if the temperature of the oil in the pan is not properly controlled, the quality of the fried food will be reduced. The recommended pan is one in which the size and material of the pan (this is referred to as the type of pan) is specified, and a steel pan of a predetermined size is usually used.

  If this recommended pan is made of iron, but other pans, such as stainless steel pans, are used, the desired fried food cannot be achieved, so the pan material on the induction cooker Technology to determine whether or not the material is made of iron, and if it is made of iron, it shifts to the desired heating state, but if it is not made of iron, it is determined that it cannot be used and does not shift to the heated state There is.

JP 2003-86343 A

  As described above, the electromagnetic cooker has a mechanism in which a pan placed on the electromagnetic cooker generates heat by an electromagnetic induction action, and thus the types of pans to be used are limited. And in an electromagnetic cooker, the system which detects the temperature of oil indirectly is employ | adopted as control for maintaining the temperature of the oil in a pan at predetermined temperature (it is said to maintain this at heat retention temperature). For this reason, it is the structure which detects the temperature of the pan which rose by heating with the temperature detection sensor arrange | positioned under the top plate of the electromagnetic cooker which mounts a pan. When a predetermined iron pan is used, a reference value is set as to what temperature the temperature detection sensor detects, and the temperature of the oil in the pan becomes a predetermined heat retention temperature. The technology that controls the temperature of the oil in the pan to the predetermined heat-retaining temperature while comparing the reference value with the temperature detected by the temperature detection sensor from time to time after energization is started. is there.

  In this way, the electromagnetic cooker is a mechanism that heats the pot placed on it by electromagnetic induction, so the types of pots used are limited and suitable for frying (general name including both tempura and fried food). It is not easy to use when only one specific type of pan is available.

  In view of this point, an object of the present invention is to improve the usability by allowing a plurality of types of pans suitable for fried foods to be used. In that case, it is of course possible to use an iron pan that is generally suitable for frying, but in addition to this, it is also possible to use a stainless steel pan generally sold in stores to improve the usability of the electromagnetic cooker. It is intended.

  In addition, when the temperature of the oil in the pan is heated toward a predetermined heat retention temperature (for example, 180 ° C.), when the control based on the temperature detected by the temperature detection sensor is performed, the temperature detection sensor is equivalent to the heat retention temperature 180 ° C. Even if detected, the temperature of the oil has not yet reached it. This is because when the oil temperature is heated to 180 ° C., the oil temperature does not reach the heat retention temperature of 180 ° C., but when the temperature of the pot rises to the heat retention temperature of 180 ° C., the temperature detection sensor Due to the detection. Such a situation varies depending on the type of pan and the amount of oil in the pan. Therefore, when a plurality of types of pans can be used, the temperature of the oil quickly reaches a temperature of 180 ° C. after heating is started. It is desirable to control it.

  In view of this point, the present invention provides a technique for heating oil to a heat retention temperature of 180 ° C. promptly after starting heating, corresponding to a plurality of types of pans. In this case, the temperature of the oil rising after the start of heating until the temperature detection sensor detects a temperature exceeding the heat retention temperature of 180 ° C. (this is called overshoot heating). The control is made in consideration of the rise, and the temperature of the oil is quickly raised to the heat retaining temperature (180 ° C. in the embodiment).

  For this reason, in the present invention, during the heating period from the start of heating of the cooking container (or pan) until the oil in it reaches the heat retaining temperature, the type of each pan and the amount of oil therein By performing overshoot heating in accordance with the ratio of overshoot heating determined accordingly, the temperature of the oil can be quickly raised to a predetermined heat retention temperature.

  As a means for this purpose, the present invention employs a method of determining the material of the pan based on the difference in the driving frequency when the pan is heated with a constant input, and the radius of the exciting coil is used to determine the size of the pan. The temperature detection sensors are arranged at different positions in the direction, and the size of the pan is determined based on the difference in the detected temperatures of the temperature detection sensors. And it adopts a judgment means to judge what kind of oil is contained in what kind of pan, and thereby, the temperature of the oil is quickly brought to a predetermined heat retaining temperature by proper overshoot heating. It can be raised.

  In the first invention, a switching element is provided to control energization to an exciting coil disposed under the top plate of the electromagnetic cooker body, a drive circuit for driving the switching element, and a bottom of the cooking container (or pan) A controller for controlling the high frequency power supplied to the exciting coil to be close to a target power value by a control signal given to the drive circuit while performing temperature detection of a temperature detection sensor for detecting temperature; In the electromagnetic cooker configured to maintain the oil in the cooking container (or pan) placed on the cooking container (or pan) at a predetermined temperature, the temperature detection sensor is configured to start heating the cooking container (or pan). Overshoot heating means for heating until an overshoot temperature exceeding the oil keeping temperature is detected, and a type determining means for determining the type of the cooking container (or pan) The temperature detection is performed for the overshoot temperature determined corresponding to a temperature difference that is reduced by stopping the heating between the start of heating of the cooking container (or pan) and the arrival of the heat insulation temperature of the oil. After heating until the sensor detects, it is controlled by the controller to maintain the temperature of the oil.

  A second invention is characterized in that, in the first invention, the overshoot temperature is a value determined according to a kind of each pan and an amount of oil therein.

  According to a third invention, in the first invention or the second invention, the type determining means heats the cooking container (or pan) with a constant input in a process of starting the heating of the cooking container (or pan) to the heat retaining temperature of the oil. The material determination means for determining the material of the cooking container (or pan) according to the difference in the driving frequency of the control signal and the difference in the detected temperature of the temperature detection sensor disposed at a different position in the radial direction of the excitation coil A size determining means for determining the size of the cooking container (or pan) is provided.

  According to a fourth invention, in any one of the first to third inventions, the temperature detection sensor is arranged at a first temperature detection sensor arranged at a central portion of the exciting coil and an intermediate portion in a radial direction of the exciting coil. The size determination means determines the size of the cooking container (or pan) based on the difference between the detected temperatures of the first and second temperature detection sensors.

  In the present invention, during the heating period from the start of heating of the cooking container (or pan) until the oil therein reaches the heat retaining temperature, it is determined according to the type of each pan and the amount of oil therein. By performing overshoot heating according to the ratio of overshoot heating, the temperature of the oil can be quickly raised to a predetermined heat retention temperature.

  In the present invention, the material of the pan is determined based on the difference in driving frequency when the pan is heated with a constant input, and the size of the pan is determined based on the difference in the detected temperature of the temperature detection sensor arranged at a different position in the radial direction of the exciting coil. By determining, the oil can be controlled to have a predetermined temperature by a control operation corresponding to the determined type of pan.

  Moreover, since this invention determines the magnitude | size of a cooking container (or pan) from the difference of the detection temperature of a 1st and 2nd temperature detection sensor, it becomes easy to judge the magnitude | size in the case of iron, and it corresponds to the magnitude | size. By controlling the state, the oil can be controlled to have a predetermined temperature.

It is a perspective view which shows the state which integrated the heating cooker which concerns on this invention in the kitchen equipment stand. It is a perspective view which shows the inside which removed the top plate of the heating cooker which concerns on this invention. It is an energization control circuit of the induction heating coil concerning the present invention. It is a flowchart of the kind determination control of the cooking container (or pan) and the oil temperature determination control according to the present invention. It is a flowchart of the kind determination control of the cooking container (or pan) and the oil temperature determination control according to the present invention. It is a voltage-frequency relationship diagram in the cold start control of the temperature determination control and the material determination control of the cooking container (or pan) according to the present invention. It is a numerical relationship figure of the voltage for every kind of cooking container (or pan) in FIG. 6, and a drive frequency. It is a relationship diagram of the voltage and frequency in the hot start control of the temperature determination control and the material determination control of the cooking container (or pan) according to the present invention. It is a numerical relationship figure of the voltage and drive frequency for every kind of cooking container (or pan) in FIG. It is a figure which shows the drive frequency of the cooking container (or pan) which concerns on this invention, (A) shows the drive frequency at the time of high input (at the time of 1500W input) using an iron pan, (B) shows the low of iron pan use The drive frequency at the time of input (at the time of 500W input) is shown. It is a figure which shows the state in which the drive frequency in the case of increasing the input of the cooking container (or pan) which concerns on this invention is reduced gradually. It is a figure which shows the change of the temperature of the oil when the cooking container (or pan) which concerns on this invention puts 200 g of oil into the small diameter iron pan, and the detection temperature of pan bottom TH and coil TH. It is a figure which shows the change of the temperature of the oil when the cooking container (or pan) which concerns on this invention puts 500 g of oil into a small diameter iron pan, and the detection temperature of pan bottom TH and coil TH. It is a figure which shows the change of the temperature of the oil when the cooking container (or pan) which concerns on this invention puts 700 g of oil into the small diameter iron pan, and the detection temperature of pan bottom TH and coil TH. It is a figure which shows the change of the temperature of oil, the detection temperature of pan bottom TH, and coil TH when the cooking container (or pan) which concerns on this invention puts 900 g of oil into the small diameter iron pan. It is a table | surface figure which shows the overshoot tp (target correction value) based on tx measured value and ty measured value for every kind of cooking container (or pan) which concerns on this invention. It is a table | surface figure which shows the tx calculated value with respect to the oil amount for every kind of cooking container (or pan) which concerns on this invention. It is a table | surface figure which shows the overshoot correction value tp set with respect to the tx calculation value for every kind of cooking container (or pan) which concerns on this invention.

  In the present invention, a switching element is provided to control energization to an exciting coil disposed under the top plate of the electromagnetic cooker body, a drive circuit for driving the switching element, and a bottom temperature of the cooking vessel (or pan) A control unit for controlling the high frequency power supplied to the excitation coil to be close to a target power value by a control signal given to the drive circuit while performing temperature detection of a temperature detection sensor for detecting In the electromagnetic cooker configured to maintain the oil in the placed cooking container (or pan) at a predetermined temperature, the temperature detection sensor is configured to start the heating of the cooking container (or pan). An overshoot heating means for heating until an overshoot temperature exceeding the heat retention temperature is detected, and a type determining means for determining the type of the cooking container (or pan) The overshoot temperature determined corresponding to the temperature difference that decreases due to the stop of the heating from the start of heating the cooking container (or pan) to the temperature at which the oil is kept warm is used for the temperature detection. After heating until the sensor detects, the control unit performs control to maintain the temperature of the oil. Embodiments of an electromagnetic cooker according to the present invention will be described below with reference to the drawings.

  Hereinafter, as an example of the present invention, an embodiment of an electromagnetic cooker 1 having one induction heating coil 4 and one radiant heater 5 will be described in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a state in which the electromagnetic cooking device 1 according to the first embodiment of the present invention is attached to a kitchen equipment table 7. The electromagnetic cooker 1 is a form incorporated into the insertion hole of the upper surface plate 7A of the kitchen equipment table 7 such as a system kitchen, a cooking table or a sink, by a drop-in method, and a main body 2 that forms a substantially rectangular case. And a top plate 3 made of heat-resistant glass supported by a top plate frame 6 attached to the upper surface portion of the main body portion 2, and the main body portion 2 has a front and rear space in the lower space corresponding to the top plate 3. An induction heating coil 4 (hereinafter referred to as an excitation coil 4) and a radiant heater 5 are provided as heat sources that are installed at intervals. The main body 2 forms a substantially rectangular case having an upper surface opening by a side wall 2B attached to the bottom wall 2A so as to surround the bottom wall 2A and surrounding four sides. Moreover, the top plate 3 made of heat-resistant glass is in a state where the peripheral portion is supported by a top plate frame 6 attached to the side wall 2B with screws so as to cover the upper surface opening of the main body 2.

  A circular cooking container is placed on the top surface of the top plate 3 corresponding to the excitation coil 4 and the radiant heater 5 in order to clearly show the place where the cooking container 10 such as a pan (hereinafter referred to as the pan 10) is placed. Parts 8 and 9 are displayed by printing or the like. In the embodiment, the exciting coil 4 has a calorific value at a rated voltage of 200 V (volt) and a maximum input (or maximum input) of 1500 W (watt), and the radiant heater 5 has a rated voltage of 200 V and a maximum input (or rating). Input) Although it is a thing of the emitted-heat amount in 1200w, it is not limited to this.

  Below the upper surface plate 7A of the kitchen equipment table 7 (the sink 7) is an article storage space 12A, and the front surface of the article storage space 12A can be opened and closed by an open / close door. As described above, in the electromagnetic cooker 1 dropped into the insertion hole of the kitchen equipment stand 7, the bottom wall 2A of the main body 2 is exposed above the article storage space 12A.

  An excitation coil 4 and a radiant heater 5 are arranged in the main body 2. The excitation coil 4 is attached to the upper surface of a synthetic resin support frame 4A. The support frame 4A is supported by a synthetic resin base member 20 attached to the bottom wall 2A of the main body 2 by a coil spring, and the periphery of the support frame 4A. The flange is biased upward so that the flange contacts the lower surface of the heat-resistant glass top plate 3. As a result, the exciting coil 4 is held in a substantially horizontal state close to the lower surface of the top 3. Further, the radiant heater 5 is mounted in a heat-resistant support frame 5A having an opening on the upper surface, and the support frame 5A is supported by coil springs 19 at a plurality of locations on the upper surface of a support base 18 mounted so as to rise from the bottom wall 2A. The support frame 5A is urged upward so as to contact the lower surface of the top plate 3 made of heat-resistant glass. As a result, the radiant heater 5 is held in a substantially horizontal state in proximity to the lower surface of the top plate 3.

  The electromagnetic cooker 1 includes an operation switch unit 13 for performing energization control and heat generation control of the excitation coil 4 and the radiant heater 5, an LED display unit 14 corresponding to the operation switch unit 13, and the like at the front of the top frame 6. An operation unit 15 is provided. Further, a control device 30 constituting a control circuit unit for performing energization control and heat generation control of the exciting coil 4 and the radiant heater 5 and a heat radiation fin 27 of the control device 30 are mounted inside the main body 2. The printed wiring board 25 is attached to the upper surface of the synthetic resin base member 20. A cooling fan (not shown) for cooling the heat radiation fins 27 and cooling the exciting coil 4 and the radiant heater 5 is provided inside the main body 2, and the exhaust from the cooling fan is connected to the rear side wall. The air passes through the exhaust slit 28 formed in 2B and is discharged upward from the exhaust unit 16 formed in the rear part of the top frame 6. An exhaust cover 17 having a large number of exhaust holes 17A is attached to the exhaust portion 16. A control circuit unit for performing energization control and heat generation control of the exciting coil 4 and the radiant heater 5 and a printed wiring board 25 to which the heat dissipation fins 27 of the control circuit unit are attached are formed on the upper surface of the synthetic resin base member 20. It is attached.

  The excitation coil 4 attached to the upper surface of the support frame 4A is suitable for heating both the small and large ones of the bottom surface of the pan 10 placed on the top plate 3, The inner coil portion 4P and the outer coil portion 4Q that are connected in series are separately arranged concentrically.

  In order to mainly detect the heating state of the pot 10, a temperature detection sensor (hereinafter referred to as the pot bottom) that mainly detects the pot bottom temperature of the pot 10 is provided at the center of the inner coil portion 4 </ b> P so as to be positioned at the center of the exciting coil 4. TH). Further, a temperature detection sensor (hereinafter referred to as a coil TH) that mainly detects the temperature of the exciting coil 4 and the temperature of the bottom periphery of the pan 10 is disposed between the inner coil portion 4P and the outer coil portion 4Q.

  A control device 30 for electrically controlling the electromagnetic cooker 1 is shown in FIG. The control device 30 mainly includes a resonance circuit 32 having an excitation coil 4 and a resonance capacitor 31 connected in parallel thereto, a rectification circuit 34 that converts AC power supplied from a commercial power supply 33 into DC power, and a rectification circuit 34. In order to convert the DC power input from RF into high frequency power and supply it to the exciting coil 4, each of the inverter circuit 36 having switching elements 35A and 35B connected to the resonance circuit 32 and the switching elements 35A and 35B is switched. Drive circuits 37A and 37B for controlling the operation, and a control unit 38 for controlling the high frequency power supplied to the exciting coil 4 to be close to the target power value by changing the drive frequency of the control signal given to the drive circuits 37A and 37B. It has. In the embodiment, the AC power supplied from the commercial power source 33 is AC power having a rated voltage of 200 volts (hereinafter referred to as 200 V). In addition to this, the control device 30 also includes a control circuit unit that controls energization of the radiant heater 5.

  In addition to this, the control device 30 includes analog temperature values and voltage values of the temperature detection circuit 39, the current detection circuit 40, the voltage detection circuit 41, the current detection circuit 40, and the voltage detection circuit 41 based on the temperature detection of the pan bottom TH and the coil TH. Is converted to a digital value. The control unit 38 receives a switch operation signal from the operation unit 15, a signal from the temperature detection circuit 39, a signal from the A / D conversion circuit 42, and the like so as to play a central role in controlling the power of the excitation coil 4. The CPU 43 as a central processing unit, the ROM 44 that is a memory that stores an operation program executed by the CPU 43, the RAM 45 that is a memory that stores information for the CPU 43 to perform a control operation, and the like. The capacitor 31S is a snubber capacitor.

  The high frequency power supplied to the exciting coil 4 is input power calculated from the current value detected by the current detection circuit 40 and the voltage value detected by the voltage detection circuit 41, and this is the output power of the electromagnetic cooker 1. (For example, the maximum output is 1500 W). This input can be controlled by controlling the switching time by ON-OFF of the switching elements 35A and 35B by the drive circuits 37A and 37B.

  When input control is performed by controlling the switching time by ON / OFF of the switching elements 35A and 35B by the drive circuits 37A and 37B, the drive frequency is lowered and the energization time to the exciting coil 4 is set as shown in FIG. The input is increased if the length is increased, and the input is decreased if the drive frequency is increased and the energization time to the exciting coil 4 is shortened as shown in FIG. For this reason, in order to set the high frequency power supplied to the exciting coil 5 to a high input 1500 W, the switching elements 35A and 35B are controlled to be turned on and off at a low frequency corresponding to the high power as shown in FIG. do it. Further, in order to set the high frequency power supplied to the exciting coil 5 to a low input of 500 W, the switching elements 35A and 35B are controlled to be turned on and off at a high frequency corresponding to that as shown in FIG. That's fine.

  A control method for variably controlling the drive frequency so as to achieve a predetermined target power value will be described. FIG. 11 is an explanatory diagram when the drive frequency is gradually lowered when heating to a predetermined target power value. In FIG. 11, if the target power value is 1500 W, for example, when the excitation coil 4 is driven at a certain driving frequency (indicated by (1) KHz), it is checked whether or not the input is 1500 W. If 1500 W is not output, the excitation coil 4 is driven at a predetermined drive frequency (indicated by (2) KHz) lower than that to check whether the input is 1500 W. Here, if 1500 W is not yet output, the exciting coil 4 is driven at a predetermined drive frequency (indicated by (3) KHz) lower than that to check whether the input is 1500 W. In this way, the drive frequency is changed so that the input is 1500 W. It should be noted that Ta1: Tb1 = Ta2: Tb2 = Ta3: Tb3 = 1. The numerical values in parentheses of (1) KHz, (2) KHz, and (3) KHz do not indicate 1 KHz, 2 KHz, or 3 KHz. In (1), (2), and (3), for example, specific frequency values such as 300, 200, and 100 are entered.

  More specifically, when the deep-fried food cooking is started by operating the deep-fried food switch 13B in the state where the target power value is set to 1500 W in the electromagnetic cooker 1, the controller 38 first heats at 1500 W. Start and divide 1500 W by the voltage value detected by the voltage detection circuit 41 at a predetermined time interval to obtain a current value I1 at that time, and divide this I1 by the set value I0 to obtain a calculated value at that time x1 is calculated, and the exciting coil 4 is driven at a driving frequency f1 corresponding to x1. Similarly, at a predetermined time interval, 1500 W is divided by the voltage value detected by the voltage detection circuit 41 to obtain a current value I2 at that time, and this I2 is divided by the set value I0 to obtain the current value. A calculated value x2 is calculated, and the exciting coil 4 is driven at a drive frequency f2 corresponding to x2. With this relationship, the excitation coil 4 is driven with the drive frequencies f1, f2, f3... Corresponding to the calculated values x1, x2, x3... And controlled until the target power value reaches 1500 W. The In this control, table data indicating the correspondence between the calculated values x1, x2, x3... And the drive frequencies f1, f2, f3... Is set in the ROM 44 or the RAM 45.

  For example, in the control for reducing the input to 500 W when heating at 1500 W, similarly to the above, the drive frequencies f1, f2, f3 corresponding to the calculated values x1, x2, x3. Depending on the relationship, the excitation coil 4 is driven while gradually increasing the drive frequency, and it is checked whether or not 500 W has been output. If 500 W has not yet been output, the excitation coil has a higher predetermined drive frequency. 4 is driven, and control is performed until the target power value reaches 500 W by checking whether or not the input is 500 W again.

  As shown in FIG. 11, the waveforms of the driving frequencies for performing ON / OFF control of the switching elements 35 </ b> A and 35 </ b> B are opposite in ON / OFF timing. Then, in order to prevent a large current from flowing at the time of ON-OFF switching and destroying the switching elements 35A and 35B, an operation with a certain switching time difference as shown in d is performed. .

  The target power value is usually referred to as an input of the electromagnetic cooker 1, and in the embodiment, when the rated voltage of the AC power supplied from the commercial power supply 43 is 200V, the maximum value of the electromagnetic cooker 1 is set. The maximum input, which is the target power value, is 1500 watts (hereinafter referred to as 1500 W).

  When the pan 10 filled with oil is placed in the electromagnetic cooker 1 and heating is started by the excitation coil 4 with a certain input, the temperature detected by the pan bottom TH when the pan 10 is made of iron, and pans of other materials It is different from the temperature detected by the pan bottom TH when it is used. Since the temperature rise of the pan 10 varies depending on the heating, the temperature detected by the pan bottom TH varies depending on the material of the pan 10, and the temperature of the oil placed in the pan 10 deviates from a predetermined heat retention temperature. For this reason, it is necessary to carry out appropriate heating control for maintaining the oil at a predetermined heat-retaining temperature depending on what kind of material the pan 10 is made of. In this regard, even when a plurality of types of pans 10 are used, the energization control of the exciting coil 4 is performed so as to determine the material of the pan 10 and to output a predetermined rated input, thereby maintaining the oil at a predetermined temperature. Therefore, a technique for determining the material of the pan 10 placed on the electromagnetic cooker 1 is provided. This technique is described below.

  In the present invention, in the state where the pan 10 filled with oil is placed on the top surface of the top plate 3 corresponding to the exciting coil 4, one of the operation switch units 13 provided in the operation unit 15 for starting heating is used. The power switch 13A is turned on. In this state, the deep-fried food switch 13B is operated, the control unit 38 operates based on the ON signal, and the CPU 43 executes the processing operation according to the operation program stored in the ROM 44.

  Thus, the deep-fried food switch 13B is operated and the control part 38 operate | moves based on the ON signal. Thereby, the heating of the pan 10 is started, and the oil therein is heated. Within a predetermined time from this start (within 40 seconds in the embodiment), the material determination of the pan 10 is performed according to a constant input state suitable for the material determination. This material determination will be described based on the flowcharts of FIGS. 4 and 5 and 6 to 8 showing the relationship between the material of the pan 10 and the driving frequency. The flowcharts shown in FIGS. 4 and 5 show the steps of the processing operation executed by the CPU 43 in accordance with the operation program stored in the ROM 44. The temperature determination by each temperature determination means and the material determination for determining the material of the pan 10 are performed. Each determination means such as means means an operation unit executed for each step shown in FIGS. 4 and 5 as the processing operation of the CPU 23.

  In the present invention, when the temperature of the pan 10 filled with oil at the start of frying is high to some extent, if the pan 10 is heated with a high input, there is a risk of fire, so it is configured with safety means to prevent it. . For this reason, the determination step which performs the determination whether the pan 10 mounted in the cooking container mounting part 8 is already heated is provided. Hereinafter, the determination operation when this temperature determination means is provided will be described.

  Specifically, with the pan 10 filled with oil placed on the cooking vessel placing portion 8, the power switch 13 </ b> A is operated to the ON state, and the control device 30 becomes operable and stored in the ROM 44. In accordance with the operation program, the CPU 43 can execute the processing operation. Then, the fried food switch 13B is turned on as a frying start (step S1 in FIG. 4), whereby the CPU 23 executes a processing operation.

  In this invention, the determination step (step S2 of FIG. 4) which determines first whether the pan 10 mounted in the cooking container mounting part 8 is already heated is provided. For this reason, the temperature detection of the pan 10 placed on the cooking container placement unit 8 is performed by the pan bottom TH, and temperature data based on the detection is input from the temperature detection circuit 39, and the pan 10 is brought to a predetermined temperature in accordance with the operation of the CPU 43. Whether it is heated or not is determined by the temperature determining means (step S2 in FIG. 4). In the embodiment, it is determined in step S2 whether the detected temperature of the pan bottom TH is 60 ° C. or lower, and if the detected temperature is 60 ° C. or lower (YES), the pan 10 is cold. As shown in FIG. For this reason, when oil is heated to a predetermined heat-retaining temperature of 180 ° C. so that the temperature is suitable for fried food, there is no risk of ignition even if the pan 10 is heated at a high input, so a constant high input 1500 W Then, the process proceeds to the step of heating the pan 10 (step S3 in FIG. 4).

  Then, by the operation of the control unit 38, the constant input power calculated based on the current value detected by the current detection circuit 40 and the voltage value detected by the voltage detection circuit 41 is supplied to the exciting coil 4 and heating is started. (Step S3 in FIG. 4). In step S3, the inverter circuit 16 is controlled by varying the drive frequency applied to the drive circuits 17A and 17B so that the high-frequency power supplied to the exciting coil 4 becomes an input 1500 W that is a target power value. As described above with reference to FIG. 11, this variable control of the drive frequency drives the excitation coil 4 with the drive frequencies f1, f2, f3... Corresponding to the calculated values x1, x2, x3. Thus, control is performed so as to obtain a predetermined target power value. In this state, if the driving frequency at that time is checked, the material of the pan 10 currently used can be determined.

  The present invention applies this technical idea so that three types of pots 10 can be used. Hereinafter, the determination means will be described.

  In the present invention, it is determined whether or not a first predetermined time (for example, 20 seconds) has elapsed from the start of heating at 1500 W (step S3) in order to stably determine the material of the pan 10 (FIG. 4). Step S4) When 20 seconds have elapsed (YES), the first frequency determination means starts checking (measuring) the drive frequency (Step S5 in FIG. 4). The circuit configuration in which the CPU 43 executes the processing operation is provided with first frequency detection means for detecting the drive frequency of the control signal (PWM signal) to be supplied to the drive circuit 37, whereby the drive frequency is checked.

  Then, it is determined whether or not a second predetermined time (for example, 40 seconds) longer than the first predetermined time has elapsed since the start of heating at 1500 W (step S6 in FIG. 4). The process proceeds to step S7 and subsequent steps in FIG. For this reason, the material of the pot 10 is determined by the material determination means from step S7 to step 11 in FIG. 4 according to the driving frequency checked between the first predetermined time (for example, 20 seconds) and the second predetermined time (for example, 40 seconds). It means to judge.

  As described above, in the present invention, when the drive frequency of the control signal exceeds the predetermined upper limit value A or exceeds the predetermined upper limit value A in step S7 and step S8 of FIG. (In this case, the pan 10 made of SUS18-8) is determined (step S9 in FIG. 4). When the predetermined lower limit B or less or less than the predetermined lower limit B, the second type of pan 10 (here, SUS18). -0 made pan 10) (step S10 in FIG. 4), and if it is within the range between the upper limit value A and the lower limit value B, the third type material pan 10 (here, iron pan 10) It determines (step S11 of FIG. 4) The material determination means is provided. This determination is performed by a material determination unit configured by the control unit 30.

  If the determination by this material determination means is demonstrated in detail, in step S7 and step S8 of FIG. 4, the material of the pot 10 will be determined by whether the drive frequency of the control signal is higher or lower than a predetermined upper limit value A. First determining means (step S7 in FIG. 4) and second determining means (step S8 in FIG. 4) for determining the material of the pan 10 depending on whether it is higher or lower than the predetermined lower limit B. Based on the determination by the first and second determination means within a predetermined time from the start of control in a constant input state by the control unit 30, as will be described later, control to maintain a predetermined heat retention temperature (180 ° C. in the embodiment). Is done.

  More specifically, in step S7 and step S8 in FIG. 4, it is determined whether or not the drive frequency of the control signal is equal to or higher than a predetermined upper limit value A or exceeds a predetermined upper limit value A. First determination means (steps S7 and S9 in FIG. 4) for determining that the pan 10 is a first type of material (here, pan 10 made of SUS18-8) when A exceeds A or a predetermined upper limit A. Second determination means (step S8 in FIG. 4 and step S8 in FIG. 4) that determines that the pan is made of the second type of material (here, the pan 10 made of SUS18-0) when it is less than or equal to the predetermined lower limit B or less than the predetermined lower limit B. S10) and third determination means (step S7 in FIG. 4) for determining that the pot is a third type of pot 10 (here, iron pot 10) if it is within the range between the upper limit value A and the lower limit value B. S8 and S11), and the control unit 30 Based on the determination of the first to third means within a predetermined time after the control starts at a predetermined input condition, as will be described later, a predetermined retained temperature (in the embodiment 180 ° C.) is controlled to maintain the performed.

  In an Example, the iron pan 10, the SUS18-0 pan 10, and the SUS18-8 pan 10 are set as the applicable pan 10, In that case, within the range of the upper limit A and the lower limit B If the upper limit value A and the lower limit value B are set so that the iron pan 10 is obtained, the pan 10 made of SUS18-8 is formed in the upper region, and the pan 10 made of SUS18-0 is formed in the lower region. Judgment can be made easily. That is, the SUS18-8 pan 10 has a higher drive frequency than the frequency determination range of the iron pan 10 that is the range between the upper limit A and the lower limit B (described as the frequency iron determination range in FIG. 4). Since the SUS18-0 pan 10 has a lower driving frequency than the iron pan 10, in steps S7 and S8 in FIG. 4, the determination is based on the iron pan 10 or the SUS18-0 pan. It is the structure which determines whether it is the pan 10 or the SUS18-8 pan 10. This is substantially the same as the case where the determination is made by comparing the upper limit value A (reference value upper limit A) and the lower limit value B (reference value lower limit B) as described above.

  As described above, during a second predetermined time (for example, 40 seconds) from the start of heating, heating is performed at a constant input 1500 W in the case of a cold start, and heating is performed at a constant input 500 W in the case of a hot start, during the first predetermined time. The material of the pan 10 is determined by the material determination means from step S7 to step S11 in FIG. 4 according to the driving frequency checked during a second predetermined time (for example, 40 seconds) from (for example, 20 seconds). Thus, when the oil is started to be heated to a predetermined temperature of 180 ° C., the material judgment of the pan 10 is performed. The oil is not yet heated to the predetermined temperature of 180 ° C. This is because a phenomenon in which the value of the drive frequency for maintaining the temperature varies depending on the material of the pan 10 can be accurately captured.

  6 and 7 show the relationship of the drive frequency to the power supply voltage (voltage rectified by the rectifier circuit 34) detected by the voltage detection circuit 41 for each type of pan 10 when heating is started at 1500 W. ing. As shown in FIG. 6, when the reference power supply voltage is set to 200V, the power supply voltage has two types of iron pans so that regular material determination can be performed even when the power supply voltage fluctuates within a range of ± 20V. 10, the upper limit A and the lower limit B for setting the SUS18-0 pan 10 and the SUS18-8 pan 10 as the applicable pan 10 are set in the ROM 44 or the RAM 45.

  As shown in FIG. 6, when the power supply voltage is 200 V, the upper limit value A of the drive frequency (described as the reference value upper limit A in FIG. 7) in the material determination is 26.3 KHz, and the lower limit value B of the drive frequency. (Described as reference value lower limit B in FIG. 7) is 23.4 KHz. When the power supply voltage is in the range of 180 V to 220 V, the upper limit value A of the drive frequency is the value indicated by the graph G1, and the lower limit value B of the drive frequency is the value indicated by the graph G2. As apparent from FIG. 6, the range of the graph G1 and the graph G2 is the iron pan 10 that is the third type of pan 10, and the first type of pan is the one that exceeds or exceeds the graph G1. It is the pan 10 made from SUS18-8 which is 10, and the thing below the graph G2 or less shows that it is the pan 10 made from SUS18-0 which is the 2nd kind of pan 10.

  For this reason, the graph G3 shown in FIG. 6 is one kind of commercially available iron fried pan 10 having a bottom diameter of 10 cm. The graph G4 is one of the iron attached frying pans 10 prepared exclusively for the electromagnetic cooker 1 of the embodiment, and is an iron attached frying pan 10 having a bottom diameter of 22 cm. Moreover, the graph G5 shown in FIG. 6 is one of the SUS18-8 pots 10 having a bottom diameter of 18 cm, and the graph G6 is one of the SUS18-0 pots 10.

  7, among the graph values shown in FIG. 6, the upper limit value A (reference value upper limit A), the lower limit value B (reference value lower limit B) when the power supply voltage is 180 V, 200 V, and 220 V, G3: commercially available iron The driving frequency of the frying pan 10, G4: the driving frequency of the iron fried pan 10 made of iron, G5: the driving frequency of the pan 10 made of SUS18-8, and G6: the driving frequency of the pan 10 made of SUS18-0 are shown.

  Thus, if the upper limit A and the lower limit B are within this range, the value determined so that many iron pans can be used in consideration of the size and material of the iron pan suitable for normal use. It is. For this reason, the frequency range between the upper limit value A and the lower limit value B can be referred to as an iron determination range as described in step S7 in FIG. It can be said that the SUS18-8 pan 10 is above or beyond this range, and the SUS18-0 pan 10 is below or below this range.

  In the above, it is determined in step S2 in FIG. 4 whether the detected temperature of the pan bottom TH is 60 ° C. or lower, and if the detected temperature is 60 ° C. or lower (YES), the detected temperature is 60 ° C. or lower. The case where it is not less than (NO) will be described below. In this case, the pan 10 is warmed, and the hot start control is performed as shown in FIG.

  In the embodiment, it is determined in step S2 of FIG. 4 whether the detected temperature of the pan bottom TH is 60 ° C. or less. If the detected temperature is not less than 60 ° C. (NO), a constant low input (500 W in the embodiment) is determined. ) To heat the pan 10 (step S31 in FIG. 4). This is a state in which the pan 10 is warmed, so if heated to a predetermined heat-retaining temperature (180 ° C. in the embodiment) that is suitable for deep-fried food, the temperature of the oil in the pan 10 will rise rapidly. Since there is a risk of fire, the process proceeds to the step of heating the pan 10 with a constant low input (500 W in the embodiment) (step S31 in FIG. 4).

By the operation of the control unit 38, the constant input power calculated based on the current value detected by the current detection circuit 40 and the voltage value detected by the voltage detection circuit 41 is supplied to the exciting coil 4 and heating starts ( Step S31 in FIG. In step S31, the inverter circuit 16 is controlled by varying the drive frequency applied to the drive circuits 17A and 17B so that the high-frequency power supplied to the excitation coil 4 becomes an input 500 W that is the target power value. In this variable control of the drive frequency, as described above with reference to FIG. 11, the excitation coil 4 is driven with the drive frequencies f11, f22, f33... Corresponding to the calculated values x11, x22, x33. Thus, control is performed so as to obtain a predetermined target power value. In this state, if the driving frequency at that time is checked, the material of the pan 10 currently used can be determined.
The present invention applies this technical idea so that three types of pots 10 can be used. Hereinafter, the determination means will be described.

  In the present invention, it is determined whether or not a first predetermined time (for example, 20 seconds) has elapsed since the start of heating at 500 W (step S31) in order to make the material determination of the pan 10 stable (FIG. 4). Step S41) When 20 seconds have passed (YES), the first frequency determination means starts checking (measuring) the drive frequency (Step S51 in FIG. 4). The circuit configuration in which the CPU 43 executes the processing operation is provided with first frequency detection means for detecting the drive frequency of the control signal (PWM signal) to be supplied to the drive circuit 37, whereby the drive frequency is checked.

  Then, it is determined whether or not a second predetermined time (for example, 40 seconds) longer than the first predetermined time has elapsed since the start of heating at 500 W (step S61 in FIG. 4), and the material determination is made when 40 seconds have elapsed (YES). It shifts to the step after step S71 of Drawing 4 which judges the material of pot 10 by means. For this reason, the material of the pot 10 is determined by the material determination means from step S71 to step S111 in FIG. 4 according to the driving frequency checked between the first predetermined time (for example, 20 seconds) and the second predetermined time (for example, 40 seconds). It means to judge.

  As described above, in the present invention, when the drive frequency of the control signal exceeds the predetermined upper limit value A or exceeds the predetermined upper limit value A in step S71 and step S81 of FIG. (Here, the pan 10 made of SUS18-8) is determined (step S91 in FIG. 4). When the predetermined lower limit B or less or less than the predetermined lower limit B, the second type of pan 10 (here, SUS18). -0 made pan 10) (step S101 in FIG. 4), and if it is within the range between the upper limit value A and the lower limit value B, a third type of material pan 10 (here, iron pan 10) Material determining means for determining (step S111 in FIG. 4) is provided. This determination is performed by a material determination unit configured by the control unit 30.

  If the determination by this material determination means is demonstrated in detail, in step S71 and step S81 of FIG. 4, the material of the pan 10 will be determined by whether the drive frequency of the control signal is higher or lower than a predetermined upper limit C. First determination means (step S71 in FIG. 4) and second determination means (step S81 in FIG. 4) for determining the material of the pan 10 depending on whether it is higher or lower than the predetermined lower limit D. Based on the determination of the first and second determination means within a predetermined time from the start of control in a constant input state by the control unit 30, as will be described later, the control unit 30 supplies the oil to a predetermined heat retaining temperature (180 in the embodiment). The heating control operation adapted to the material of the pan 10 is performed so that the temperature is maintained at (° C.).

  More specifically, in step S71 and step S81 in FIG. 4, it is determined whether or not the drive frequency of the control signal is equal to or higher than a predetermined upper limit value C or exceeds a predetermined upper limit value C. First determination means (steps S71 and S91 in FIG. 4) for determining that the pan is made of the first type of material (here, the pan 10 made of SUS18-8) when C exceeds or exceeds a predetermined upper limit C; Second determination means (step S81 in FIG. 4 and step S81 in FIG. 4) that determines that the pan 10 is a second type of material (here, pan 10 made of SUS18-0) when it is less than or equal to the predetermined lower limit D or less than the predetermined lower limit D. S101) and third determination means (step S71 in FIG. 4) for determining that the pot is a third type of pot 10 (here, iron pot 10) if it is within the range between the upper limit C and the lower limit D. S81 and S111) Based on the determination of the first to third means within a predetermined time from the start of control in a constant input state by the control unit 30, control to maintain a predetermined heat retention temperature (180 ° C. in the embodiment) as described later is performed. Done.

  In an Example, the iron pan 10, the SUS18-0 pan 10, and the SUS18-8 pan 10 are set as the applicable pan 10, In that case, within the range of the upper limit C and the lower limit D If the upper limit value C and the lower limit value D are set so as to become the iron pot 10, it becomes a SUS18-8 pot 10 if it is in the upper area, and it becomes a SUS18-0 pot 10 if it is in the lower area. Judgment can be made easily. In other words, the SUS18-8 pan 10 has a higher driving frequency than the frequency determination range of the iron pan 10 that is the range between the upper limit C and the lower limit D (described as the frequency iron determination range in FIGS. 4 and 5). Yes, because the SUS18-0 pan 10 has a lower drive frequency than the iron pan 10, in step S71 and step S81 in FIG. It is the structure which determines whether it is -10-made pan 10 or SUS18-8-made pan 10. This is substantially the same as the case where the determination is made by comparing the upper limit value C (reference value upper limit C) and the lower limit value D (reference value lower limit D) as described above.

  As described above, during a second predetermined time (for example, 40 seconds) from the start of heating, in the case of a cold start, heating is performed at a constant input 1500 W, and during this time, from the first predetermined time (for example, 20 seconds) to a second predetermined time (for example, The material of the pan 10 is determined by the material determination means from step S7 to step 11 in FIG. In the case of hot start, heating is performed at a constant input of 500 W, and steps S71 to 111 in FIG. 4 are performed according to the driving frequency checked during the first predetermined time (for example, 20 seconds) to the second predetermined time (for example, 40 seconds). The material of the pan 10 is determined by the material determination means described above. Thus, when the oil is started to be heated to a predetermined temperature of 180 ° C., the material judgment of the pan 10 is performed. The oil is not yet heated to the predetermined temperature of 180 ° C. This is because a phenomenon in which the value of the drive frequency for maintaining the temperature varies depending on the material of the pan 10 can be accurately captured.

  8 and 9 show the relationship of the driving frequency to the power supply voltage (voltage rectified by the rectifier circuit 34) detected by the voltage detection circuit 41 for each type of pan 10 when heating is started at 500W. ing. As shown in FIG. 8, when the reference power supply voltage is set to 200V, the power supply voltage has two types of iron pans so that regular material determination can be performed even when the power supply voltage fluctuates within a range of ± 20V. 10, the upper limit C and the lower limit D for making the SUS18-0 pan 10 and the SUS18-8 pan 10 the applicable pan 10 are set in the ROM 44 or the RAM 45.

  As shown in FIG. 8, when the power supply voltage is 200 V, the upper limit C of the drive frequency in the material determination (described as the reference value upper limit C in FIG. 9) is 34.58 KHz, and the lower limit D of the drive frequency. (Described as a reference value lower limit D in FIG. 8) is 30.71 KHz. When the power supply voltage is in the range of 180 V to 220 V, the upper limit value C of the drive frequency is the value indicated by the graph G11, and the lower limit value D of the drive frequency is the value indicated by the graph G21. As is clear from FIG. 8, the range of the graph G11 and the graph G21 is the iron pan 10 which is the third type of pan 10, and the one of the first type of pan which is equal to or higher than the graph G11. It is the pan 10 made from SUS18-8 which is 10, and the thing below the graph G21 or less shows that it is the pan 10 made from SUS18-0 which is the second kind of pan 10.

  For this reason, the graph G31 shown in FIG. 8 is a kind of commercially available iron fried pan 10 having a bottom diameter of 10 cm. The graph G41 is one of the iron fried pans 10 made of iron prepared exclusively for the electromagnetic cooker 1 of the embodiment, and is the iron fried pan 10 having a bottom diameter of 22 cm. Moreover, the graph G51 shown in FIG. 8 is one of the SUS18-8-made pans 10 with a bottom diameter of 18 cm, and the graph G61 is one of the SUS18-0-made pans 10.

  9, among the graph values shown in FIG. 8, upper limit value C (reference value upper limit C), lower limit value D (reference value lower limit D) when power supply voltage is 180 V, 200 V, and 220 V, G31: commercially available iron The driving frequency of the frying pan 10, G41: the driving frequency of the iron fried pan 10 made of iron, G51: the driving frequency of the pan 10 made of SUS18-8, and the driving frequency of the pan 10 made of G61: SUS18-0 are shown.

  Thus, if the setting of the upper limit C and the lower limit D is within this range, a value determined so that many iron pans can be used, considering the size and material of the iron pan suitable for normal use. It is. For this reason, the frequency range between the upper limit C and the lower limit D can be referred to as an iron determination range as described in Step 71 of FIG. 4, and the one in this range is the iron frying pan 10. It can be said that the SUS18-8 pan 10 is above or beyond this range, and the SUS18-0 pan 10 is below or below this range.

  As described above, in the present invention, the cooking container 10 of the first type material is a cooking container made of SUS18-8, the cooking container 10 of the second type material is a cooking container made of SUS18-0, The case where the cooking container 10 of three types of materials is an iron cooking container is taken as an example.

  As described above, in the present invention, the voltage at which the energization to the exciting coil 4 is controlled by the switching elements 35A and 35B is a DC voltage obtained by passing the voltage of the commercial AC power supply 33 through the rectifier circuit 34. The upper limit value A or C and the lower limit value B or D are set according to the driving frequency of the control signal for various values. 4 and 5 show the upper limit value and the lower limit value within the range of the iron cooking container 10. FIG.

  As described above, in the cold start control, after the material determination of the pan 10 is performed by the operations from step S1 to step 11 in FIG. 4, the process proceeds to step S12 in FIG. Transition. Hereinafter, the size determination of the pan 10 will be described.

  In step S12 of FIG. 4 in which the size determination of the pan 10 is started, in order to obtain an input state suitable for the size determination of the pan 10, the constant for determining the size is considerably lower than the input 1500W in the material determination. Control to heat with input (1100 W in the example). In the embodiment, the inverter circuit 16 is controlled by varying the drive frequency applied to the drive circuits 17A and 17B so that the high-frequency power supplied to the exciting coil 4 becomes the input 1100 W that is the target power value. As described above with reference to FIG. 11, this variable control of the drive frequency drives the excitation coil 4 with the drive frequencies f1, f2, f3... Corresponding to the calculated values x1, x2, x3. Thus, control is performed so as to obtain a predetermined target power value.

  Then, in step S13 in FIG. 4, it is determined by the determining means whether the detected temperature of the pan bottom TH is 120 ° C. or higher, and if it is 120 ° C. or higher, in step S14 in FIG. Whether or not the material is the iron pan 10 is determined by the determining means. If the determination is not the iron pan 10, the process proceeds to step S16 in FIG. On the other hand, when the determination in step S14 is the iron pan 10, the process proceeds to step S15 in FIG.

  In the present invention, depending on the detected temperature of the coil TH and the detected temperature of the pan bottom TH, the size of the iron fried pan 10, that is, the pan 10 having a small diameter on the bottom surface or the pan 10 having a large diameter on the bottom surface. In order to determine whether or not there is a configuration, the arrangement of the coil TH is set at a position distant from the pan bottom TH disposed at the center of the exciting coil 4 in the radial direction.

  In step S15 of FIG. 4, the determination means determines whether the bottom diameter of the iron fry pan 10 is large or the bottom diameter of the fried iron pan 10 is small, based on the detection temperature of the coil TH and the detection temperature of the pan bottom TH. Is done. This determination is a determination of the size of the iron pan 10, and the determination criterion is whether or not the diameter of the bottom surface of the iron pan 10 is greater than or equal to a predetermined diameter (in the embodiment, 14 cm as a reference). Here, if the detected temperature of the coil TH is equal to or higher than the detected temperature of the pan bottom TH, it is determined that the bottom diameter of the iron fried pan 10 is small (step S17 in FIG. 4), and the detected temperature of the coil TH is the pan bottom TH. If the temperature is less than or less than the detected temperature, it is determined that the bottom of the iron fried pan 10 has a large diameter (step S18 in FIG. 4).

  Regarding the size determination of such a pan 10, the pan 10 employed in the embodiment will be described below.

  In the embodiment, in order to heat both the small-diameter pan 10 and the large-diameter pan 10 that are normally used by the exciting coil 4, the diameter of the exciting coil 4, that is, the outer diameter of the outer coil portion 4Q. The inner coil portion 4P and the outer coil portion 4Q are formed so as to be approximately 15 cm and suitable for heating both the small-diameter pan 10 and the large-diameter pan 10.

  In the present invention, in the iron fried pan 10, the pan bottom diameter is determined based on a predetermined diameter (in the embodiment, 14 cm is a reference), and the pan having a pan bottom diameter larger than 14 cm is determined as the large-diameter pan 10, A pot whose diameter at the bottom of the pot is smaller than 14 cm is determined to be a large diameter pot 10. This is an example, and the present invention is not bound by this number.

  Since the pan bottom TH is located at the center of the exciting coil 4, the pan bottom temperature of the pan 10 is mainly detected in both the small-diameter pan 10 and the large-diameter pan 10. On the other hand, the portion between the inner coil portion 4P and the outer coil portion 4Q is affected by heating by both the inner coil portion 4P and the outer coil portion 4Q, and this portion has the same temperature in the exciting coil 4 portion. It is a part that tends to be expensive. The coil TH is arranged here, and depending on the temperature state, the size of the pan 10, that is, whether the bottom diameter is a small diameter pan 10 or the bottom diameter is a large diameter pan 10 is determined. Can do.

  The iron pan 10 having a pot bottom diameter of 22 cm is heated by both the inner coil portion 4P and the outer coil portion 4Q in the state where it is placed on the cooking container mounting portion 8 at the regular position, but it has an excitation of approximately 15 cm in diameter. There are many pot bottom parts located in the outer side of the coil 4, and the detection temperature of coil TH becomes low. For this reason, when the detected temperature of the pan bottom TH reaches a predetermined judgment temperature of 120 ° C., that is, when the detected temperature of the pan bottom TH is 120 ° C. or higher, the detection of the pan bottom TH is detected more than the detected temperature of the coil TH. The temperature is high (opposite of the state shown in FIGS. 12 to 15), and in this case, it is determined that the fried iron pan 10 has a large bottom diameter (step S18 in FIG. 4).

  On the other hand, the pan 10 having a pan bottom diameter of 10 cm is covered with the coil TH within the range of the exciting coil 4 having a diameter of about 15 cm when placed in the normal position on the cooking vessel mounting portion 8. When there is almost no pan bottom portion located outside of 4 and the entire pan bottom is heated by both the inner coil portion 4P and the outer coil portion 4Q, the detection temperature of the pan bottom TH reaches 120 ° C., that is, detection of the pan bottom TH When the temperature is 120 ° C. or higher or exceeded, the detected temperature of the coil TH becomes higher than the detected temperature of the pan bottom TH, as shown in FIGS. For this reason, it is determined that the bottom diameter of the iron fried pan 10 is small (step S17 in FIG. 4).

  In the above description, the size is determined in the iron fried pan 10 as a material suitable for fried food. However, in the case of the stainless steel pan 10 made of SUS18-8 or SUS18-0, the detected temperature of the coil TH and the pan bottom If the reference value can be set so as to determine the size of the pan 10 according to the relationship of the detected temperature of TH, the size determination of the stainless steel pan 10 can be performed.

  Thus, in the cold start control, after the size determination of the pan 10 is performed by the operation from step S12 to step 18 in FIG. 4, the process proceeds to step S19 in FIG. Transition to judgment. What kind of oil is contained in what kind of pan 10 is determined if the temperature of the pan 10 once heated to a predetermined temperature is within a predetermined time if the ambient temperature of the electromagnetic cooker is substantially constant. It can be determined by measuring whether the temperature drops to a certain level.

  When the temperature of the oil in the pan 10 is heated toward a predetermined heat retaining temperature (180 ° C. in the embodiment), control is performed based on the detected temperature of the pan bottom TH, but the pot bottom TH is kept at the heat retaining temperature (180 ° C. in the embodiment). ) Even if the equivalent is detected, the temperature of the oil has not yet reached it. This is because when the oil is heated toward the heat retention temperature (180 ° C. in the embodiment), the temperature of the pan 10 is kept at the heat retention temperature (implementation) even though the oil temperature has not reached the heat retention temperature (180 ° C. in the embodiment). This is due to the fact that the pan bottom TH detects when the temperature rises considerably in the example. For this reason, when the oil is heated to the heat retaining temperature (180 ° C. in the embodiment) after the heating is started, the oil is heated until the temperature at which the pan bottom TH exceeds the heat retaining temperature (180 ° C. in the embodiment) is detected. Without the chute heating, the temperature of the oil cannot be quickly raised to the heat retention temperature (180 ° C. in the embodiment).

  For this reason, in this invention, according to the kind of each pot and the quantity of oil in it, the ratio of this overshoot heating is predetermined, and what kind of oil is given to what kind of pot 10 In accordance with this determination, the oil temperature can be quickly raised to the heat retention temperature (180 ° C. in the embodiment) by executing overshoot heating at a predetermined rate based on this determination. To do.

  As described above, after determining the type (material and size) of the pan 10, the amount of oil contained in the pan 10 is determined. Hereinafter, the determination of the amount of oil contained in the pan 10 will be described.

  As described above, the fried food switch 13B is turned on, and the material is determined based on the driving frequency in the state of the constant first input (1500 W) from the start of heating to the first predetermined time of 40 seconds. From the first predetermined time of 40 seconds to the arrival of the first temperature (120 ° C.) lower than the target heat retention temperature of 180 ° C., a constant second input (1100 W) lower than the first input (1500 W) When the first temperature (120 ° C.) is reached, the size of the pan 10 is determined based on the relationship between the detected temperature of the coil TH and the detected temperature of the pan bottom TH.

  As described above, a predetermined heating stop time is provided from when the detected temperature of the pan bottom TH reaches the predetermined first temperature (120 ° C.) in the size determination. The formation of this heating stop time is the heating stop at step S19 in FIG. 5, and the temperature of the pan 10 and the oil therein decreases due to this heating stop, so the amount of oil is determined by the rate of the temperature decrease in that case. In the embodiment, the heating stop time is 3 minutes.

  For each type of pan 10, the determination of the amount of oil in the pan 10 is started (step S19 in FIG. 5), and in step S20 in FIG. 5, the fried food switch 13B is operated and heating of the pan 10 is started. It is determined whether or not 3 minutes have passed (step S20 in FIG. 5). Based on the detection after 3 minutes, the temperature difference tx (tx ° C. in FIG. 16) from the first temperature (120 ° C.) is measured by detecting the pan bottom TH, and the oil amount is determined from this temperature difference tx (FIG. 5). Step S21). That is, when the detected temperature of the pan bottom TH detects the first temperature (120 ° C.), the heating is stopped for 3 minutes, the temperature drop (temperature difference tx) caused by this stop is measured, and the oil temperature is detected by this temperature difference tx. Determine the amount. This determination of the oil amount is based on the “temperature difference tx vs. oil amount” given for each type of pan 10 (in the example, SUS18-0, SUS18-8, 22 cm diameter iron, and 10 cm iron diameter). From the table data, the oil amount is determined based on the operation of the CPU 43. This “temperature difference vs. oil amount” data is set in the ROM 44 or RAM 45 as table data.

  If this is explained based on FIG. 16, for example, in the case of an iron 10 cm pan, the oil amount when the temperature difference tx is 9 ° C. (see FIG. 12) is 200 g, and in the case of an iron 10 cm pan, the temperature difference When tx is −13 ° C. (see FIG. 13), the amount of oil is 500 g. In the case of an iron 10 cm pan, when the temperature difference tx is −17 ° C. (see FIG. 14), the amount of oil is 700 g. In the case of an iron 10 cm pan, the oil amount when the temperature difference tx is −19 ° C. (see FIG. 15) is 900 g.

  Next, in step S22 in FIG. 5, the temperature difference tx (tx ° C. in FIG. 16) from the first temperature (120 ° C.) is measured by detecting the pan bottom TH as described above, and the overshoot is performed based on this temperature difference tx. An overshoot value tp (° C.) for performing heating is determined for each type of pan 10. That is, when the detection temperature of the pan bottom TH detects the first temperature (120 ° C.), the heating is stopped for 3 minutes, the temperature drop (temperature difference tx) caused by this stop is measured, and the temperature difference tx is exceeded. The shoot value tp (° C.) is determined.

  As shown in FIG. 16, the overshoot value tp (° C.) is a value obtained by subtracting the heat retention temperature (180 ° C. in the embodiment) from the temperature ty exceeding the predetermined target heat retention temperature (180 ° C. in the embodiment). If this is explained based on FIG. 16, for example, in the case of an iron 10 cm pan, when the temperature difference tx is 9 ° C. (see FIG. 12), the overshoot value tp is 5 (° C.), and the iron 10 cm pan When the temperature difference tx is −13 ° C. (see FIG. 13), the overshoot value tp is 32 (° C.), and in the case of the iron 10 cm pan, the temperature difference tx is −17 ° C. (FIG. 14). The overshoot value tp is 47 (° C.), and in the case of an iron 10 cm pan, the overshoot value tp when the temperature difference tx is −19 ° C. (see FIG. 15) is 54 (° C.).

  The determination of the overshoot value tp (° C.) is given for each type of pan 10 (in the example, four types of SUS18-0, SUS18-8, diameter 22 cm iron, and diameter 10 cm iron) “temperature difference tx”. The overshoot value tp (° C.) is determined from the table data of the overshoot value tp (° C.) based on the operation of the CPU 43. The data of “temperature difference tx vs overshoot value tp (° C.)” is table data. The overshoot value tp (° C.) is referred to as a target correction value as shown in FIG. 16, or the temperature rise range or normal temperature oil is set as shown in FIG. Since this is the first heating to heat up to the heat retention temperature, it is also called the initial temperature rise value.

  The data shown in FIG. 16 indicates that the temperature ty exceeds the temperature difference tx and the heat retention temperature (180 ° C. in the embodiment) based on the temperature obtained by detecting the pan bottom TH by actually heating the pan 10 with the electromagnetic cooker 1. And the overshoot value tp.

  In this way, when the pan 10 is actually heated and data is taken, the following data cannot be taken unless it is cooled to the ambient temperature after it is heated, so in order to finely determine the amount of oil A large amount of data is required, which requires a long period of time, which is not preferable. In view of this point, in the present invention, a calculation formula is made based on a plurality of data obtained as shown in FIG. 16 for the four types of pans 10, and the amount of oil for the four types of pans 10 is determined by this calculation formula. Each temperature difference tx is calculated, and a setting tx is determined from the calculated value of the temperature difference tx (this is shown in FIG. 17). Then, an overshoot value tp corresponding to the setting tx is calculated by a calculation formula (this is shown in FIG. 18), so that control under substantially the same conditions as the actual measurement values can be performed. The data set in this way is set in the ROM 44 or RAM 45 as table data for every 50 g from 100 g to 900 g of oil. As a result, for each type of pan 10, when the temperature difference tx is in degrees Celsius, it becomes clear how much oil amount is g and how much overshoot value tp is in degrees Celsius. What is necessary is just to perform temperature control by determination and overshoot value tp.

  Next, in step S23 of FIG. 5, it is determined whether or not the oil amount determined in step S21 of FIG. 5 as described above is 200 g or less determined as the minimum oil amount in normal use. If the oil amount is 200 g or less, the detected temperature data of the pan bottom TH is fetched so as to be heated at 500 W input (output) in step S24 of FIG. 5, and the current value and voltage detected by the current detection circuit 40 are detected. The energization of the exciting coil 4 is controlled by the control unit 38, the drive circuits 37A and 37B, and the inverter circuit 36 so that the constant input power calculated based on the voltage value detected by the circuit 41 becomes 500 W input (output). Is done.

  In step S23 of FIG. 5, if the oil amount is not 200 g or less, it is determined in step S25 of FIG. 5 whether the oil amount is 500 g or less of the standard oil amount in normal use. If the oil amount is 500 g or less, the detected temperature data of the pan bottom TH is fetched so as to be heated at the input (output) of 800 W in step S26 of FIG. 5, and the current value and voltage detected by the current detection circuit 40 are detected. Energization of the exciting coil 4 is controlled by the control unit 38, the drive circuits 37A and 37B, and the inverter circuit 36 so that the constant input power calculated based on the voltage value detected by the circuit 41 becomes 800 W input (output). Is done. Further, if the oil amount is not 500 g or less in step S25 of FIG. 5, the detected temperature data of the pan bottom TH is fetched so as to be heated at 1100 W input (output) in step S27 of FIG. The control unit 38 and the drive circuits 37A and 37B so that the constant input power calculated based on the current value detected by the current detection circuit 40 and the voltage value detected by the voltage detection circuit 41 becomes 1100 W input (output). And the energization of the exciting coil 4 is controlled by the inverter circuit 36.

  Next, in step S28 of FIG. 5, while being heated with the 500W input (output), 800W input (output), or 1100W input (output) determined in steps S23 to S27 of FIG. It is determined whether or not the overshoot value tp determined in step S22 of FIG. 5 has been reached. When the overshoot value tp is reached, in step S29 of FIG. 5, the size and material of each pan 10 determined as described above, that is, the type of pan 10 (in the embodiment, SUS18-0, SUS18-8). In addition, based on the “predetermined temperature detection data of the pot bottom TH for stabilizing the predetermined heat retention temperature of oil (180 ° C. in the embodiment)” provided for each of the four types of iron, 22 cm diameter, and 10 cm diameter iron The temperature is controlled to be 180 ° C. in the embodiment. This control is performed so that the input power calculated based on the current value detected by the current detection circuit 40 and the voltage value detected by the voltage detection circuit 41 is varied based on the detected temperature data of the pot bottom TH. 38, the drive circuits 37A and 37B, and the inverter circuit 36 are controlled based on the operation of the CPU 43 so that the energization of the exciting coil 4 is controlled. The “detected temperature data of the pot bottom TH for stabilizing the predetermined oil keeping temperature (180 ° C. in the embodiment)” is set in the ROM 44 or RAM 45 as table data.

  12 to 15, as described above, the oil is controlled so that the oil reaches a predetermined heat-retaining temperature (180 ° C. in the embodiment) from the start of heating for the small-diameter iron pan (10 cm diameter iron pan in the embodiment). The temperature change is shown. For other SUS18-0, SUS18-8, and 22cm diameter iron pans, which are large diameter iron pans, the oil is kept at a predetermined temperature from the start of heating by the overshoot value tp corresponding to the material, size, and oil amount. The temperature is controlled to be 180 ° C. in the embodiment.

  In this way, the oil is controlled so as to reach a predetermined temperature (180 ° C. in the embodiment) from the start of heating, and when the intended fried food is finished (step S30 in FIG. 5), the oil is provided in the operation unit 15. Heating is stopped by a heating stop switch, which is one of the operation switch sections 13, or the power switch 13A is turned off (step S0 in FIG. 5).

  In the case of hot start control, since the constant input for heating the pan 10 is a low input such as 500 W in the material determination, if the input state is 1100 W suitable for the size determination of the pan 10, the oil temperature Since there is a risk of sudden increase, the size is not determined. For this reason, when it determines with the iron pan 10 in FIG.4 S111, it handles as the large diameter iron pan 10 (22 cm diameter iron pan of an Example). For this reason, after passing through the material determination as described above, in step S121 of FIG. 4, for each type of pan 10 (in the embodiment, four types of SUS18-0, SUS18-8, 22 cm diameter iron, and 10 cm diameter iron). Is set to “predetermined temperature of the oil that is kept at a predetermined temperature (180 ° C. in the embodiment) and data of the detected temperature of the bottom TH of the oil + 20 ° C.”. In step S121 of FIG. The operation following step S23 of step 5 is performed. The operations after step S23 in FIG. 5 are the same as in the case of the cold start control.

  In the above, the pan temperature determination step for determining whether the temperature determination means is cold start control or hot start control is provided, but without this, the deep-fried food switch 13B is turned on (FIG. 4). Thus, even when the oil amount is determined only through the cold start control flow, it is within the technical scope of the present invention.

  The electromagnetic cooker according to the present invention is not limited to the configuration shown in the above embodiment, but can be applied to various forms, and includes various forms within the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic cooker 2 ... Main part 2A ... Bottom wall of main part 3 ... Top plate 4 ... Induction heating coil (excitation coil)
5 ... Lagent heater 6 ... Top frame 7 ... Kitchen equipment stand (sink)
7A ... Top plate 8, 9 ... Cooking container placement part 10 ... Cooking container (pot)
13 ... Operation switch part 13A ... Power switch 13B ... Fried food switch 16 ... Exhaust part 17 ... Exhaust cover 19 ... Coil spring 20 ... Base member 21 ... .... Coil spring 25 ... Circuit board 27 ... Radiation member 28 ... Exhaust slit 30 ... Control device 31 ... Resonance capacitor 32 ... Resonance circuit 33 ... Commercial power supply 34 ... Rectifier circuit 35A ... Switching element 35B ... Switching element 36 ... Inverter circuit 37A, 37B ... Drive circuit 38 ... Control unit 39 ... Temperature Detection circuit 40 ... Current detection circuit 41 ... Voltage detection circuit 42 ... A / D conversion circuit 43 ... CPU
44 ... ROM
45 ... RAM

Claims (4)

The switching element is provided to control the power supply to the exciting coil disposed on the top plate of a induction cooker body, a drive circuit for driving the switching element, a temperature detecting sensor for detecting the temperature of the bottom of the tone hairdressing device a control unit for controlling so as to bring the high-frequency power supplied to the exciting coil by a control signal supplied to the drive circuit while performing the temperature detection target power value, the cooking container being placed on the top plate In an electromagnetic cooker configured to maintain the oil at a predetermined temperature,
And overshoot heating means for heating from the start of heating of said timing hairdressing device to said temperature detecting sensor detects the overshoot temperature exceeding the retained temperature of the oil,
Comprising determining the type determining unit a type of the tone hairdressing device,
Wherein, during a period from the start of heating of said timing hairdressing instrument to detect the temperature of the temperature detection sensor reaches the retained temperature of the oil, the temperature difference decreases by the stop of the heating for a predetermined time Is obtained from the output of the temperature detection sensor, the overshoot temperature is set based on the obtained temperature difference and the determination result by the type determination means, and the temperature detection sensor detects the set overshoot temperature. after heating until, electromagnetic cooker and performing control to maintain the retained temperature before Symbol oil.   The electromagnetic cooker according to claim 1, wherein the overshoot temperature is a value determined according to a type of each pan and an amount of oil therein. The type determining unit, in the process of heating to retained temperature of the oil from the start of heating of the tone hairdressing device,
Wherein the determining material determining means the material of the regulating hairdressing device by the difference of the driving frequency of the control signal, the difference in the temperature detected by the temperature detecting sensor disposed at different positions in the radial direction of the exciting coil at the time of heating at a constant input electromagnetic cooker according to claim 1 or 2, characterized in that a size determination means for determining a magnitude of said timing barber unit by. The temperature detection sensor includes a first temperature detection sensor disposed at a central portion of the excitation coil, and a second temperature detection sensor disposed at an intermediate portion in the radial direction of the excitation coil. electromagnetic cooker according to any one of claims 1 to 3, characterized in that determining the magnitude of the adjustment hairdressing device by the difference in the temperature detected by the first and second temperature detecting sensor.

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