JP2008269885A - Cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooker provided with an energization method for a heating coil suitable for stewed dishes and the like.
A DC power supply circuit, an input current detection means, an inner coil, a heating coil composed of an outer coil, an output current detection means, an inverter circuit, and a control means are provided. The control means controls the inverter circuit to control the high frequency to the inner coil. Output control of power output and high frequency power output to the outer coil are individually controlled, and output control is performed with a base output heating power that outputs both the inner coil and the outer coil with a certain output heating power, and the inner coil is higher than the base output heating power. Inner coil output period T1,5 for output by thermal power, base output period T2,4,6,8 for both inner coil and outer coil for output by base output thermal power, outer coil output for output to outer coil by higher thermal power than base output thermal power There are three output periods of periods T3 and T7, and the inner coil output period and the outer coil output period are alternately performed with the base output period interposed therebetween.
[Selection] Figure 4

Description

  The present invention relates to an improvement in a method of energizing a heating cooker, particularly a heating coil of the heating cooker.

  In the conventional cooking device, when cooking for a long time with electric power lower than the predetermined power W1, the heating output is periodically increased to a predetermined output W2 larger than the predetermined output W1, and the moisture in the pan is increased. It is possible to boil for a short time to stimulate convection in the pan and to stir the stewed material by the convection (see, for example, Patent Document 1). In addition, there has been a cooking device that divides the heating coil into two inside and outside and alternately energizes the inside and outside coils. (For example, see Patent Document 2)

JP-A-5-121153 JP-A-8-78148

  In the conventional cooking device, when cooking for a long time, the heating output is periodically increased to a predetermined output W2 larger than the predetermined output W1 to boil the water in the pan for a short time. The convection was evoked, and the simmering material could be stirred by the convection. However, the whole surface of the pan bottom was only heated at the same time, and the stirring effect was not sufficient.

  Moreover, even if it is the structure which performs electricity supply to the inner and outer coils alternately, it is difficult to improve the quality of cooking unless electricity is applied in consideration of stirring in the pan. In particular, in the IH cooker, the pan itself is heated by the electromotive force induced by electromagnetic waves from the heating coil, and cooking is performed. Therefore, although the bottom surface of the pan is easy to heat, the side surface around the pan is difficult to be heated. Since the outside of the bottom of the pan is more likely to be cooled by this, it is necessary to consider the method of energizing the heating coil resulting from this, and there is room for further study to extract better cooking performance.

  This invention is made | formed in view of the said subject, and it aims at providing the heating cooker provided with the electricity supply system to the heating coil suitable for a stewed dish etc.

  In order to achieve the above object, a heating cooker according to the present invention includes a DC power supply circuit that rectifies AC power and converts it into DC power, input current detection means that detects an input current to the DC power supply circuit, and concentric circles. A heating coil composed of an inner coil and an outer coil arranged in a shape, output current detection means for detecting a current flowing in the heating coil, and an inverter circuit for converting DC power output from the DC power supply circuit into high-frequency AC power Control means for controlling the cooker, the control means controls the inverter circuit to individually control the output of the high frequency power to the inner coil and the output of the high frequency power to the outer coil, and An output control is performed with a base output heating power that outputs both the inner coil and the outer coil with a certain output heating power, and the inner coil outputs with a heating power higher than the base output heating power. Output period, a base output period in which both the inner coil and the outer coil are output with a base output thermal power, and an outer coil output period in which the outer coil is output with a thermal power higher than the base output thermal power. The output period and the outer coil output period are alternately performed with the base output period interposed therebetween.

  ADVANTAGE OF THE INVENTION According to this invention, the cooking apparatus which can accelerate | stimulate the stirring in a pan and can perform delicious cooking with a good taste can be provided.

Embodiment 1 FIG.
Hereinafter, the present invention will be described in detail using an embodiment of the present invention. FIG. 1 is a perspective view of a cooking device according to the present invention. A heating cooker 1 shown in FIG. 1 includes a top plate 2 on which an object to be heated is placed, a right heating unit 3, a left heating unit 4, a central heating unit 5 that indicate a heating position on the top plate 2, and cooking. And a roaster 6 provided at the front of the lower part of the vessel. Further, in front of the top plate 2, there are an upper surface operation unit 7 for operating the heating output setting of each heating unit 3, 4, 5 and the like, a right dial operation unit 8 provided on the left and right of the roaster 6 on the lower front of the heating cooker, And a left dial operation unit 9. The upper surface operation unit 7 has a plurality of keys 7a to 7h for inputting a plurality of heating condition settings. In the heating cooker 1 of the present embodiment, the heating output settings of the heating units 3, 4, and 5 are set. Input and the like can be input by the upper surface operation unit 7, and the left and right dial operation units 8 and 9 can be similarly input.

  The heating power that is input and set in the upper surface operation unit 7 or the left and right dial operation units 8 and 9 and is output from the heating units 3, 4, and 5 is output from the right heating unit 3 to the heating power display unit 10 and the left heating unit 4. Are output on the thermal power display unit 11, and the output thermal power of the central heating unit 5 is displayed on the thermal power display unit 12. Moreover, the display part 13 provided in the center front of the top plate 2 is the input information set to the heating cooker 1, the remaining time display at the time of timer cooking, the mode set, such as various cooking mode settings, etc. It is composed of an LCD for displaying various information.

  FIG. 2 is a perspective view showing a state where the top plate 2 of the heating cooker 1 in FIG. 1 is removed. As shown in the figure, a right heating coil 14 is provided below the top plate 2 corresponding to the position of the right heating unit 3, and a left heating coil 15 is provided below the position corresponding to the position of the left heating unit 4. Thus, the object to be heated placed on the right heating unit 3 or the left heating unit 4 of the top plate 2 can be heated by induction heating. Also, a lower heater 16 is provided below the position corresponding to the position of the central heating unit 5, so that the object to be heated placed on the central heating unit 5 of the top plate 2 can be heated by radiant heat. It has become.

  The circuit structure about the right heating coil 14 of the heating cooker 1 in this embodiment is shown in FIG. In FIG. 3, the power supplied from the commercial AC power supply 17 is converted into DC power by the DC power supply circuit 18. The DC power supply circuit 18 includes a rectifier diode bridge 19 that rectifies AC power, a reactor 20, and a smoothing capacitor 21. The input current input to the DC power supply circuit 18 is detected by the input current detection circuit 22. The power converted into DC power by the DC power supply circuit 18 is supplied to the inverter circuit 23.

  The inverter circuit 23 includes three sets of arms each composed of two switching elements (IGBTs) connected in series between the DC buses of the DC power supply circuit 18 and diodes connected to the switching elements in antiparallel. It is made up of. Hereinafter, one of the three sets of arms is referred to as a common arm 24, and the other two sets are referred to as an inner coil arm 25 and an outer coil arm 26. The high-potential side switching elements of the arms 24, 25, and 26 are called upper switches 27, 28, and 29, and the low-potential side switching elements are called lower switches 30, 31, and 32. The high-potential side antiparallel diodes are referred to as upper diodes 33, 34, and 35, and the low-potential side antiparallel diodes are referred to as lower diodes 36, 37, and 38.

  The common arm 24 is an arm connected to an inner coil load circuit 39 and an outer coil load circuit 40, which will be described later, and includes an upper switch 27 and a lower switch 30, and an upper diode 33 connected to these switches 27 and 30 in antiparallel. The connection point of the upper switch 27 and the lower switch 30 is the output point of the common arm 24. A snubber capacitor 41 is connected to the lower switch 30 in parallel. The inner coil arm 25 is an arm to which an inner coil load circuit 39 is connected, and includes an upper switch 28 and a lower switch 31, and an upper diode 34 and a lower diode 37 connected in reverse parallel to the switches 28 and 31. Has been. A snubber capacitor 42 is connected to the lower switch 31 in parallel. The outer coil arm 26 is an arm to which the outer coil load circuit 40 is connected. The upper switch 29 and the lower switch 32, and the upper diode 35 and the lower diode 38 connected in reverse parallel to the switches 29 and 32, respectively. It consists of and. A snubber capacitor 43 is connected to the lower switch 32 in parallel.

  The upper switch 27 and the lower switch 30 of the common arm 24 are turned on / off by a drive signal output from the common arm drive circuit 44, and the upper switch 28 and the lower switch 31 of the inner coil arm 25 are driven by the inner coil arm drive circuit 45. The upper switch 29 and the lower switch 32 of the outer coil arm 26 are turned on and off by the drive signal output from the outer coil arm drive circuit 46.

  The common arm drive circuit 44 turns off the lower switch 30 while the upper switch 27 of the common arm 24 is turned on, turns the lower switch 30 on while the upper switch 27 is turned off, and turns on and off alternately. Drive signal to output. Similarly, the inner coil arm drive circuit 45 outputs a drive signal for alternately turning on and off the upper switch 28 and the lower switch 31 of the inner coil arm 25, and the outer coil arm drive circuit 46 is similarly output from the outer coil arm drive circuit 45. A drive signal for alternately turning on and off the upper switch 29 and the lower switch 32 of the coil arm 26 is output.

  The snubber capacitors 41, 42, and 43 described above are output voltages when the switches 27, 30, 28, 31, 29, and 32 of the common arm 24, the inner coil arm 25, and the outer coil arm 26 are turned off, respectively. It is provided to delay the fluctuation and reduce the turn-off loss of the switching element.

  The inner coil load circuit 39 is a series resonance circuit including an inner coil 47 and a resonance capacitor 48, and the output point of the common arm 24 (the connection point between the upper switch 27 and the lower switch 30) and the inner coil arm 25. The external coil load circuit 40 is connected between the output points (the connection point between the upper switch 28 and the lower switch 31), and the outer coil load circuit 40 is a series resonance circuit including an outer coil 49 and a resonance capacitor 50. The output point is connected between the output point of the outer coil arm 26 (the connection point of the upper switch 29 and the lower switch 32). The inner coil 47 is a heating coil having a small outer shape wound in a substantially circular shape, and an annular outer coil 49 is wound around the outer periphery thereof, and the center positions of the inner coil 47 and the outer coil 49 are substantially the same. The heating coils 14 are arranged so as to coincide with each other. The inner coil 47 and the outer coil 49 are connected by being wound in the same circumferential direction as viewed from the common arm 24, and the current flowing through the inner coil 47 and the outer coil 49 is detected by the output current detection circuit 51. To do.

  The control circuit 52 controls the heating cooker 1 as a whole, has a control timer 52a therein, keys 7a to 7h arranged on the upper surface operation unit 7 described in FIG. In response to an input instruction from the operation input means 53 such as 9, the operation state is displayed at the corresponding display location of the display units 10, 11, 12, and 13, and the detected values of the input current detection circuit 22 and the output current detection circuit 51 are displayed. While taking in, each arm drive circuit 44, 45, 46 is controlled, and a heating output is adjusted. The drive signal output to each arm 24, 25, 26 has a drive frequency higher than the resonance frequency of the inner coil load circuit 39 and the outer coil load circuit 40, and the voltage applied to the load circuit by the current flowing through the load circuit. In comparison, control is performed so as to flow in a delayed phase. The operation input means 53 has means (for example, a stew key 7d) that instructs the inner coil 47 and the outer coil 49 to alternately output a high-frequency current, and the control circuit 52 is operated by the operation of the instruction means 7d. The arm drive circuits 44, 45, 46 are controlled to output a high frequency current to the inner coil 47 and the outer coil 49 alternately.

In FIG. 3, a circuit configuration diagram of the inner coil 47 and the outer coil 49 constituting the heating coil 14 disposed below the right heating unit 3 is shown, but the heating disposed below the left heating unit 4. The coil 15 is also composed of internal and external coils as in the above description, and the circuit configuration thereof is the same as that described above, and thus the description thereof is omitted. In addition, the radial heater 16 disposed below the central heating unit 5 can be driven by a generally known circuit configuration, and thus description thereof is omitted. Hereinafter, in the same manner as described above, an example in which the heating coil 14 disposed in the right heating unit 3 of the heating cooker 1 of the present embodiment is driven will be described in more detail.

  As described above, the cooking device 1 according to the present embodiment includes a DC power supply circuit 18 that rectifies AC power supplied from the commercial AC power supply 17 and converts it into DC power, and an input current to the DC power supply circuit 18. An input power detection circuit 22 that is an input current detection means for detecting the heating current, a heating coil 14 comprising an inner coil 47 and an outer coil 49 arranged concentrically, and an output current detection means for detecting the current flowing through the heating coil 14. A certain output current detection circuit 51, an inverter circuit 23 that converts DC power that is output from the DC power supply circuit 18 into high-frequency AC power, and a control circuit 52 that is control means for controlling the cooking device 1 are provided.

  The control circuit 52 controls the inverter circuit 23 to individually control the output of the high frequency power to the inner coil 47 and the output of the high frequency power to the outer coil 49. At that time, both the inner coil 47 and the outer coil 49 are output-controlled with a base output heating power that outputs with a certain output heating power, and an inner coil output period in which the inner coil 47 outputs with a heating power higher than the base output heating power, The outer coil 49 has three output periods, namely, a base output period for outputting with the base output thermal power, and an outer coil output period for the outer coil 49 to output with a higher thermal power than the base output thermal power. The control is performed so as to be alternately performed with the base output period interposed therebetween.

  The heating cooker 1 in this embodiment is stored as a cooking mode program in the control circuit 52 which is a control means for performing the above-described inner coil output period and outer coil output period alternately with the base output period interposed therebetween. This cooking program is executed when the user inputs and sets by key input.

  FIG. 4 shows an energization pattern between the inner coil 47 and the outer coil 49 of the heating coil 14 when the cooking mode program is executed. In the figure, T1 and T5 are inner coil output periods, T3 and T7 are outer coil output periods, and T2, T4, T6, and T8 are base output periods. FIG. 5 shows an output setting table in which the heating output is determined when the heating coil 14 performs normal heating stored in the heating cooker 1 of the present invention, and FIG. 6 shows when the above-described cooking mode is executed. FIG. 7 shows an internal coil output period, an external coil output period, and a base output period corresponding to the heating level determined in the thermal power table. This information is also stored in the control circuit 52 as in the cooking mode program described above.

  Hereinafter, it demonstrates according to the order which a user actually uses the above-mentioned cooking mode program with the heating cooker 1 in this embodiment. 8-10 is explanatory drawing which shows the input screen for demonstrating the input example of a cooking mode program. As shown in FIG. 8, in the cooking device of the present embodiment, when the cooking mode key 7d is input, it is displayed on the display unit 13 that the stew mode has been set, and any of the heating powers described in FIG. The fire mode selection screen for selecting whether to energize according to the output and operation pattern. Here, when the user selects, for example, “heat control 3” using the keys 7 a to 7 h or the left and right dials 8, 9, etc., cooking time input for determining how long cooking is performed as shown in FIG. 9. It becomes a screen. Here, when the user inputs the cooking time using the keys 7a to 7h or the left and right dials 8 and 9 as described above and starts cooking, the control circuit 52 reads from the setting tables described in FIGS. Reads the information entered by the user and cooks it. When the input is completed, a display as shown in FIG. 10 is displayed. When the start of cooking is selected here, cooking is performed based on the input information.

  That is, based on the above-described example, the user selects “fire control 3”, and therefore, based on the fire control 3 setting information of FIG. 6, the inner coil 47 is thermal power 7 and the outer coil 49 is also thermal power 7. Will be output. Then, it is read from the information in FIG. 5 that the thermal power output of the thermal power 7 is 875 W, the operational pattern 3 in FIG. 7 is selected from the operational pattern information in FIG. 6, and the inner coil 47 and the outer coil 49 are driven. Will be.

  That is, after the start, the inner coil 47 outputs a heating output for 30 seconds at the heating power 7, and then outputs both the inner coil 47 and the outer coil 49 for 10 seconds at the base output heating power, in this embodiment, the output 0. Then, this time, the outer coil 49 outputs a heating output for 30 seconds with a heating power of 7, and after that, both the inner coil 47 and the outer coil 49 output with a heating power output of 0 as the base output heating power for 10 seconds. By repeating such an operation, as shown in FIG. 11, convection such as a solid arrow in the inner coil output period and a dotted arrow in the outer coil output period occurs in the pan as the object to be heated, The temperature in the pan can be made uniform, and the quality of cooking can be improved. When the cooking time set by the user is over, the display unit 13 displays as shown in FIG. 12, and simultaneously informs the user that cooking has ended with a buzzer or the like.

  The reason why the quality of cooking can be improved by alternately performing the inner coil output period and the outer coil output period with the base output period interposed therebetween will be described. Stew is a process where heat is transferred through a pot to warm the water in the pot (conduction heating), and the warmed water is moved up in the pot (convection heating), thereby moving the food in the water. Heat. When heating water, it becomes 95-100 degreeC in the case of a strong fire, and becomes about 90-94 degreeC in a low fire. The effects of boiling are the difference between “convection strength” and “temperature” due to the heating after boiling, and “heating time”. And the strong convection of the strong fire and the vibration when boiling can promote the emulsification of the oil and water of the broth and make it thick and palatable.

  Moreover, the temperature of 100 ° C. or higher destroys meat gelatin. Since gelatin is necessary for emulsification, extreme high heat is not suitable for cooking. Also, the way heat is transferred in the pan is not uniform, and the center is strong and the surroundings are weak. And by boiling for a certain period of time, amino acids and peptides that are umami components are eluted. The cooking time is about 3 to 5 hours in the case of hard meat. Therefore, in order to boil uniformly, it is important that the temperature in the pan (boiled juice) is approximately the same by appropriate convection. The heating of the conventional cooking device heats the bottom of the pan uniformly, so that the inside (center part) tends to become hot, especially because the heat is easily taken away from the skin of the pan. The convection (heat transfer) is balanced by operating the, so that heating suitable for boiled food becomes possible.

  The reason why high heat is not suitable when simmering hard or large meat is because it is spilled or the meat dances to cause boiling. By intermittently heating the strong fire with the inner and outer coils, it is not necessary to continue convection and heating while giving moderate vibration of the strong fire to promote emulsification, so it is possible to reduce boiling and spilling. . On the other hand, soft meat and sliced meat should be boiled for a short time on a medium heat. When they are boiled for a long time, the broth comes out and even the soft meat becomes hard and dry. Also in this case, it is possible to perform heating suitable for preventing emulsification, boiling, and spilling by intermittent high heat heating. Furthermore, by intermittent heating, it becomes possible to prevent the temperature from rising more than necessary even in a strong fire. In other words, by alternately performing the inner coil output period and the outer coil output period with the base output period in between, 100 ° C. suitable for boiling while relaxing boiling and spilling by causing boiling in the pot intermittently Cooking can be continued below, and cooking suitable for each food can be realized while moderately giving vibrations due to boiling to promote emulsification. It was also found that the effect of mixing taste with such a change in convection can produce the same effect as boiling for a long time in a relatively short time.

<Taste test>
A conventional cooking device that uniformly heats the bottom of the pan with the same ingredients, the same seasoning, and the soup that has been cooked in the heating cooker 1 of the present embodiment in the above-described use example 3 We made 12 soups that were cooked in a random manner, and tasted them in a state where they didn't know which cooker they had created, and selected delicious ones as follows. The result was obtained.
The soup cooked with the heating cooker 1 of this embodiment is delicious: 10 people The soup cooked with the conventional heating cooker is delicious: 2 people The reason why the soup cooked with the heating cooker 1 of this embodiment is delicious `` Sweet '', `` Taste is good '', `` There is richness '' etc., By alternately performing the inner coil output period and the outer coil output period across the base output period, It can be seen that the quality of cooking can be improved for the aforementioned reasons.

  In this embodiment, as described with reference to FIGS. 5 to 7, the cooking mode program includes the thermal power output of the inner coil 47 output in the inner coil output period and the outer coil 49 output in the outer coil output period. The thermal power output is stored in a plurality of combinations, and the user can select and use a desired combination according to the cooking performed by the user. By comprising in this way, a user can use a favorite mode according to the menu which a user wants to cook, and the usability of a heating cooker can be improved.

  Further, by setting the thermal power output of the inner coil output in the inner coil output period and the thermal power output of the outer coil output in the outer coil output period to different thermal power settings as shown in FIG. It becomes possible to realize the stew suitable for various cooking. In addition, as described above, in the IH cooker, the pan itself is heated by the electromotive force induced by the electromagnetic wave from the heating coil to perform cooking, so the bottom surface of the pan is easy to heat, but the side surface around the pan Is cooled by the outside air, and the outside of the pan bottom is easier to cool. For this reason, by setting the heating output of the outer coil larger than the heating output of the inner coil, it is possible to further promote the uniformity of the temperature in the pan while compensating for the cooling of the side surface around the pan by the outside air.

  Furthermore, the base output thermal power during the base output period allows cooking to continue at temperatures below 100 ° C, which is suitable for boiling, while intermittently causing boiling in the pot to alleviate boiling and spilling, and gives moderate vibration due to boiling. Therefore, it is desirable that the output be capable of maintaining the temperature at which the emulsification can be promoted, that is, the output at which the pan can be maintained at a temperature that is about the temperature retention, and specifically, the output is desirably 150 W or less. In particular, in the present embodiment, the base output thermal power in the base output period has been described as an example where the output is 0. However, if the output is 0, the circuit configuration of the cooking device can be simplified and the intermittent operation described above can be performed. While boiling in the pan to relieve boiling and spilling, cooking can be continued at 100 ° C or lower, which is suitable for boiling, and the maximum effect of emulsification can be obtained by moderately giving vibration from boiling. It is possible.

  In addition, the base output period acts as a preparation time for switching the convection in the pan as shown in FIG. 11, and suppresses boiling once and makes it boil intermittently by boiling and intermittent boiling. Can be adjusted within the range where this effect can be obtained, but since the time is adjusted by the cooking menu, it cannot be determined in general, but at least the inner coil output period and the outer coil output period When the energization of the inner coil or the outer coil is started, it is necessary that the time immediately allows boiling to occur in the pan, and it is preferably 20 seconds or less. On the contrary, the time of the inner coil output period and the outer coil output period is also adjusted by the cooking menu, so it cannot be determined unconditionally, but at least the boiling occurs in the inner coil output period and the outer coil output period. It is necessary that the heating time causes convection to occur, and from this point of view it is preferably 5 seconds or more. Each of these times is substantially the same in the inner coil output period and the outer coil output period, and the base output period is shorter than the inner coil output period and the outer coil output period. It is preferable because it can be made good and boiling can occur in the pan immediately after energizing the inner and outer coils.

Embodiment 2.
In the second embodiment of the present invention, the shape of the heating coil of the first embodiment is changed. A second embodiment of the present invention will be described with reference to the top view of FIG. The second embodiment is the same as the first embodiment except that the shape of the heating coil is changed.

  FIG. 13 is a top view showing an outline of an inner coil and an outer coil constituting a heating coil in the heating cooker of the present embodiment. As in the first embodiment, the inner coil 47 and the outer coil 49 are concentrically arranged with a predetermined interval, and are configured to be able to output thermal power outputs separately. In the embodiment, the inner coil 47 is concentrically arranged at a predetermined interval on the inner side and the outer side by a single coil conductor constituted by a plurality of wire elements.

  By comprising in this way, it becomes easy to prevent in the inner coil output period that the side surface around the pan is cooled by the outside air outside the outer coil output period and the outer side of the pan bottom is cooled. And in order to make such an effect larger, it is better that the distance d between the outer coil 49 and the inner coil 47 is smaller than the distance D divided into the inner coil portion 54 and the outer coil portion 55 of the inner coil 47. .

  Similarly, in order to further increase the effect of preventing the outer side of the pan from being cooled by the outside air outside the outer coil output period and the outer side of the pan bottom from being cooled in the inner coil output period, the outer coil 49 reaches the outer periphery. For the coil radius R, the region where the inner coil portion 54 of the inner coil 47 exists is an inner region of R / 2 and is as close to the center as possible, and the region where the outer coil portion 55 is present is the outer side of R / 2. It is better to be in the region.

  In addition, when the heating coil 14 is configured as in the present embodiment, when the degree of heating of the pan bottom is investigated by thermography, the heating area of the pan bottom can be increased as compared with a conventional cooker, and in a normal heating state It was also found that more uniform heating is possible.

Embodiment 3.
In the third embodiment of the present invention, whether an object to be heated exists on the outer coil 49 when the outer coil 49 is energized according to the detection output of the input current detection circuit 22 or the output current detection circuit 51 of the first embodiment. And the energization state of the outer coil 49 is changed from the first embodiment. Since other operations and configurations in the third embodiment are the same as those in the first embodiment, the description thereof is omitted.

  When an object to be heated is present on the heating coil and when it is not present, when induction heating is performed, it flows to the heating coil depending on whether electromagnetic coupling with the object to be heated occurs or not when the heating coil is energized. By detecting the power state, it can be determined whether or not an object to be heated exists on the heating coil. In the present embodiment, the heating coil 14 is divided into an inner coil 47 and an outer coil 49, and each power is controlled. Therefore, when the power state flowing through the outer coil 49 is detected when the outer coil 49 is energized, It becomes possible to determine whether or not an object to be heated exists there. That is, in the case of a normal pan, the object to be heated is also present on the outer coil 49, but in the case of a small-diameter pan, the object to be heated is present on the inner coil 47, but on the outer coil 49, There may be a state in which no object to be heated exists.

  In this embodiment, when it is determined that there is no object to be heated on the outer coil 49 in this way, that is, the diameter of the object to be heated placed on the top plate 2 outputs the thermal power output of the outer coil 49. When it is determined that the size is inappropriate for this, the outer coil output period is not performed as in the energization pattern shown in FIG. Thereby, the inner coil output period and the base output period are repeatedly performed. With this configuration, wasteful power that does not contribute to heating can be reduced, and leakage magnetic flux generated by energizing the outer coil 49 when there is no object to be heated on the outer coil 49 can be reduced. It becomes possible to plan.

  When it is determined that there is no object to be heated on the outer coil 49, the same effect as described above can be obtained even when the output of the outer coil in the outer coil output period is executed with the same output as the output in the base output period. be able to.

Embodiment 4.
In the fourth embodiment of the present invention, the temperature detection means for detecting the temperature of the object to be heated is provided in the first embodiment, and when the cooking mode program is started, both the inner coil 47 and the outer coil 49 are energized. When it is detected that the cooked food in the object to be heated has reached a predetermined temperature based on the output of the temperature detecting means, the internal coil is automatically generated by any of the fires shown in FIG. The output period and the outer coil output period are alternately performed with the base output period interposed therebetween. By configuring in this way, it is possible to perform desired cooking in a shorter time, and it is possible to save the user from having to cook until reaching a predetermined temperature, thereby improving the usability of the heating cooker. Can do.

  In addition, as such a temperature detection means, a thermistor provided so as to be in contact with the back surface of the heating units 3 and 4 of the top plate 2, an infrared sensor provided so as to be able to measure the temperature of an object to be heated, etc. Any widely known sensor for temperature sensing can be used.

  In carrying out the present embodiment, the desired temperature detected by the temperature detecting means that shifts to the execution of a program that alternately performs the inner coil output period and the outer coil output period with the base output period interposed therebetween is determined by the user. May be configured to be freely input-set, or may be determined in advance as a specification based on the respective fire-up / down settings shown in FIG. By comprising in this way, the perfection degree of cooking according to each cooking menu can be raised more.

  Further, in the present embodiment, in the period in which both the inner coil 47 and the outer coil 49 are energized at the initial stage of cooking, the inner coil output period and the outer coil output period are alternately executed with the base output period interposed therebetween. Based on a desired temperature detected from the temperature detecting means to be transferred, a certain threshold temperature is determined, and when the temperature reaches the threshold, both the inner coil 47 and the outer coil 49 are energized with a relatively high output heating power, When the threshold temperature is exceeded, the thermal power is reduced to prevent overshoot, and when the desired temperature is reached, the inner coil output period and the outer coil output period are alternately executed with the base output period in between. You may comprise so that it may transfer. By adopting such a configuration, it becomes possible to prevent spilling and boiling caused by overshooting, making it possible to perform better stew cooking, and it is possible to improve the usability of the heating cooker It becomes. In addition, instead of the temperature detection means in the present embodiment, it is possible to use a vibration sensor for detecting the boiling of the cooked food in the object to be heated, from the viewpoint of detecting the boiling. Even when a vibration sensor is used, desired cooking can be performed in a shorter time, and it is possible to save the user from cooking until reaching a predetermined temperature, thereby improving the usability of the heating cooker. It is possible to obtain the effect that

Embodiment 5.
In the first embodiment, the thermal power output of the inner coil 47 output in the inner coil output period and the thermal power output of the outer coil 49 output in the outer coil output period have been described as examples, but the inner coil output period, You may comprise so that the time of an outer coil output period and a base output period may differ. By comprising in this way, it becomes possible to carry out the operation adjustment of the convection in a pan, and to implement the stew suitable for various cooking. In addition, by setting the outer coil output period longer than the inner coil output period, it is possible to promote more uniform temperature in the pan while compensating for cooling of the side surface around the pan due to the outside air.

  Further, an operation of alternately performing the inner coil output period and the outer coil output period with the base output period interposed therebetween is stored in the control circuit 52 as a cooking mode program, and the cooking mode program includes the time of the inner coil output period, The time of the outer coil output period and the time of the base output period are stored in a plurality of combinations, and the user can select a desired combination and configure it so that it can be used. In addition, a favorite mode can be used, and the usability of the cooking device can be improved.

  Further, the thermal power output of the inner coil 47 output in the inner coil output period and the thermal power output of the outer coil 49 output in the outer coil output period are made different according to various cooking menus, and the inner coil output period and outer coil output are varied. It is also possible to configure the time period and the time of the base output period to be different, and to combine both of them to cook more various menus.

  Further, as the cooking mode program, when the predetermined time has elapsed from the start of cooking, the heating power output of the inner coil 47 output in the inner coil output period at the beginning of cooking and the heating power output of the outer coil 49 output in the outer coil output period. Then, each heating output at the beginning of the start may be changed, and the time of the inner coil output period, the outer coil output period, and the base output period at the beginning of cooking, when a predetermined time has elapsed from the start of cooking, You may make it change the time of each output period of the start initial stage. By doing in this way, it becomes possible to perform more delicate cooking. Moreover, you may make it change the time of such a heating output or the time of an output period in multiple times during one cooking.

  In each of the above-described embodiments, the cooking menu has been described with an example of stew. However, the heat retention mode for maintaining the temperature at a certain temperature and the boiling maintenance for maintaining the boiling while preventing rapid water evaporation are described. It can also be configured to perform cooking in accordance with various cooking scenes such as modes, and such a mode is stored in the control circuit 52 as a cooking program and can be selected and used by the user so that cooking is possible. It becomes possible to improve the usability of the vessel.

It is a perspective view of the heating cooker of this invention. It is a perspective view which shows the state which removed the top plate of the heating cooker of this invention in FIG. It is a circuit block diagram which shows the circuit structure about the right heating coil of the heating cooker of this invention. It is explanatory drawing which shows the electricity supply pattern to the inner coil and outer coil of a heating coil in the heating cooker of this invention. It is the output setting table which defined the heating output when performing the normal heating memorize | stored in the heating cooker of this invention with a heating coil. It is a heating power setting and operation | movement pattern table which defined the heating output of the inner coil and the outer coil when the cooking mode of the heating cooker of this invention was performed. It is an execution timetable of the inner coil output period, the outer coil output period, and the base output period according to the heating level of the heating cooker of the present invention. It is explanatory drawing which shows the input screen for demonstrating the input example of a cooking mode program with the heating cooker of this invention. It is explanatory drawing which shows the input screen for demonstrating the input example of a cooking mode program with the heating cooker of this invention. It is explanatory drawing which shows the input screen for demonstrating the input example of a cooking mode program with the heating cooker of this invention. It is explanatory drawing which described the mode of the convection in a pan which occurs when using a cooking mode program with the heating cooker of this invention. It is explanatory drawing which shows the display part for demonstrating the example of a display during execution of the cooking mode program with the heating cooker of this invention. It is a top view which shows the outline | summary of the inner coil which comprises the heating coil in the heating cooker of this invention, and an outer coil. It is explanatory drawing which shows the electricity supply pattern to the inner coil and outer coil of a heating coil when it is judged that it is unsuitable to energize the outer coil in the heating cooker of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Heat cooker, 2 Top plate, 3 Right heating part, 4 Left heating part, 5 Center heating part, 6 Roaster, 7 Upper surface operation part, 7a-h key, 8 Right dial operation part, 9 Left dial operation part, 10 Right thermal power display unit, 11 Left thermal power display unit, 12 Central thermal power display unit, 13 Display unit, 14 Right heating coil, 15 Left heating coil, 16 Radiant heater, 17 Commercial AC power supply, 18 DC power supply circuit, 19 Rectifier diode bridge , 20 reactor, 21 smoothing capacitor, 22 input current detection circuit, 23 inverter circuit, 24 common arm, 25 inner coil arm, 26 outer coil arm, 27 upper switch, 28 upper switch, 29 upper switch, 30 lower switch, 31 Lower switch, 32 Lower switch, 33 Upper diode, 34 Upper diode, 35 Upper diode Ode, 36 Lower diode, 37 Lower diode, 38 Lower diode, 39 Inner coil load circuit, 40 Outer coil load circuit, 41 Snubber capacitor, 42 Snubber capacitor, 43 Snubber capacitor, 44 Common arm drive circuit, 45 Arm drive for inner coil Circuit, 46 Arm drive circuit for outer coil, 47 Inner coil, 48 Resonance capacitor, 49 Outer coil, 50 Resonance capacitor, 51 Output current detection circuit, 52 Control circuit, 52a Control timer, 53 Operation input means, T1, T5 Inner coil Output period, T3, T7 Outer coil output period, T2, T4, T6, T8 Base output period, 54 Inner coil part, 55 Outer coil part.

Claims (9)

A DC power supply circuit that rectifies AC power and converts it into DC power, input current detection means for detecting an input current to the DC power supply circuit, a heating coil composed of an inner coil and an outer coil arranged concentrically, An output current detecting means for detecting a current flowing through the heating coil, an inverter circuit for converting DC power output from the DC power supply circuit into high-frequency AC power, and a control means for controlling the cooking device,
The control means controls the inverter circuit to individually control the output of the high frequency power to the inner coil and the output of the high frequency power to the outer coil, and outputs both the inner coil and the outer coil to a certain output. The output is controlled by the base output thermal power that is output by thermal power,
An inner coil output period for outputting to the inner coil with a heating power higher than the base output heating power, a base output period for outputting both the inner coil and the outer coil with a base output heating power, and outputting to the outer coil with a heating power higher than the base output heating power A heating cooker having three output periods of an outer coil output period, wherein the inner coil output period and the outer coil output period are alternately performed with the base output period interposed therebetween.   The cooking device according to claim 1, wherein a thermal power output of the inner coil output in the inner coil output period is different from a thermal power output of the outer coil output in the outer coil output period.   The cooking device according to claim 1 or 2, wherein the inner coil output period, the outer coil output period, and the base output period are different in time.   The cooking device according to any one of claims 1 to 3, wherein the base output thermal power during the base output period is an output of zero.   The time of the said inner coil output period and an outer coil output period is substantially the same, The time of a base output period is shorter than the time of the said inner coil output period and an outer coil output period, The one of the Claims 1 thru | or 4 characterized by the above-mentioned. The heating cooker described in 1.   An operation of alternately performing the inner coil output period and the outer coil output period with a base output period in between is stored as a cooking mode program in the control means, and the cooking mode program is output during the inner coil output period. The thermal power output of the inner coil and the thermal power output of the outer coil output during the outer coil output period are stored in a plurality of combinations, and the user can select and use any combination The cooking device according to any one of claims 1 to 5.   An operation of alternately performing the inner coil output period and the outer coil output period with a base output period in between is stored as a cooking mode program in the control means, and the cooking mode program includes a time of the inner coil output period. 7. The time of the outer coil output period and the time of the base output period are stored in a plurality of combinations, and the user can select and use any combination. The cooking device according to any one of the above.   The inner coil and the outer coil are concentrically arranged with a predetermined interval, are configured to be able to output thermal power separately, and the inner coil further has a predetermined interval on the inside and outside. The cooking device according to any one of claims 1 to 7, wherein the cooking device is arranged concentrically.   A heating plate comprising an inner coil and an outer coil disposed concentrically below the top plate, the heating coil being disposed on the top plate; When the diameter of the heated object is unsuitable for outputting the thermal power output of the outer coil, the outer coil output period is not performed, or the output of the outer coil in the outer coil output period is output in the base output period. The cooking device according to any one of claims 1 to 8, wherein the cooking device is executed as the same.

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