JP2014168596A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating cooker which can exhibit cooking performance even if an input voltage is changed, and which can exhibit the cooking performance even if used in a region in which a rated voltage is different.SOLUTION: A rice cooker 1 comprises rice cooking heaters 51.. for heating a cooked object, and a control device 40 for controlling the rice cooking heaters 51... The control device 40 changes a ratio of operation times Ta and non-operation times Tb of the rice cooking heaters 51.., and adjusts an output power amount per unit time Tu of the rice cooking heaters 51...

Description

  The present invention relates to a cooking device technology.

  Conventionally, heating cookers such as rice cookers are known. The heating cooker induces an eddy current to cause the cooking container to self-heat. Such a heating cooker is called an IH heating cooker (see, for example, Patent Document 1). Moreover, there exists what heats a cooking container using an electric heater. Such a heating cooker is referred to as a heater-type heating cooker (see, for example, Patent Document 2).

  By the way, these cooking devices are operated by electricity supplied from a commercial power source. For this reason, when the voltage of the commercial power source changes, the amount of heat transferred to the object to be cooked also changes. That is, when the voltage of the commercial power source changes, the original cooking performance cannot be exhibited. This is the same when used in areas with different rated voltages.

  Here, in order to demonstrate concretely, a heater-type rice cooker is assumed. A heater-type rice cooker heats a cooking container using an electric heater to cook rice. The electric heater has a characteristic that the output power changes in proportion to the square of the input voltage. For example, if the electric heater has an output power of 1000 watts when the input voltage is 100 volts, the output power becomes 810 watts when the input voltage is 90 volts. Also, when the input voltage is 110 volts, the output power is 1210 watts. For this reason, in a heating cooker such as a heater-type rice cooker, there is a problem that when the input voltage changes, the original cooking performance cannot be exhibited. In addition, when used in areas with different rated voltages, there is a problem that the original cooking performance cannot be exhibited.

JP 2011-110370 A Japanese Patent Laid-Open No. 9-56581

  An object of this invention is to provide the heating cooker which can exhibit cooking performance, even if an input voltage changes. Moreover, it aims at providing the heating cooker which can exhibit cooking performance even if it uses it in the area where a rated voltage differs.

  Next, means for solving this problem will be described.

That is, the first invention is
Heating means for heating the cooking object;
A heating cooker comprising a control device for controlling the heating means,
The controller changes the ratio of the operating time and the non-operating time of the heating means to adjust the output power amount per unit time of the heating means.

  According to the first invention, the output power amount per unit time can be adjusted. Thereby, it becomes possible to adjust the amount of heat transmitted to the object to be cooked.

The second invention is the heating cooker according to the first invention,
The control device includes an input voltage detection unit that detects an input voltage, changes a ratio between an operation time and a non-operation time of the heating unit according to the detected input voltage, and outputs an output per unit time of the heating unit. The amount of electric power is made constant.

  According to the second invention, the output power amount per unit time can be made constant even if the input voltage changes. Thereby, since the amount of heat transmitted to the object to be cooked is the same, it becomes possible to exhibit the original cooking performance.

A third invention is the heating cooker according to the first invention,
The control device includes a control mode storage unit that stores a control mode according to a rated voltage, and changes a ratio between an operation time and a non-operation time of the heating unit according to the stored control mode. The output power amount per unit time is made constant.

  According to the third aspect of the invention, the amount of output power per unit time can be made constant even when used in areas with different rated voltages. Thereby, since the amount of heat transmitted to the object to be cooked is the same, it becomes possible to exhibit the original cooking performance.

4th invention is the cooking-by-heating machine which concerns on any 1st to 3rd invention,
In the temperature raising step, the control device performs control for raising the temperature step by step every multiple of the unit time.

  According to the fourth aspect of the invention, it is possible to apply control for changing the ratio between the operating time and the non-operating time of the heating means throughout the temperature raising step. As a result, the amount of heat transferred to the object to be cooked is the same even when the input voltage changes or when the rated voltage is used in different areas, so that it is possible to share control in the temperature raising process. .

  According to the invention according to the present application, it is possible to provide a heating cooker that can exhibit the original cooking performance even when the input voltage changes. In addition, it is possible to provide a heating cooker that can exhibit its original cooking performance even when used in areas with different rated voltages.

The figure which shows the heater type rice cooker which concerns on one Embodiment of this invention. The figure which shows the control system of the heater type rice cooker which concerns on 1st embodiment. The figure which shows the control flow of the heater type rice cooker which concerns on 1st embodiment. The figure which shows the control aspect when an input voltage changes. The figure which shows the control system of the heater type rice cooker which concerns on 2nd embodiment. The figure which shows the control flow of the heater type rice cooker which concerns on 2nd embodiment. The figure which shows the control aspect for every area from which a rated voltage differs. The figure which shows the control aspect in a temperature rising process.

  First, a heater-type rice cooker (hereinafter referred to as “rice cooker”) 1 that is a typical cooking device will be briefly described. In addition, the technical idea of this invention is not restricted to the rice cooker 1 demonstrated below, It is possible to apply also to other heating cookers, such as a home bakery and a table cooker.

  Drawing 1 is a figure showing rice cooker 1 concerning one embodiment of the present invention. In addition, the left side in FIG. 1 is defined as the front side of the rice cooker 1, and the right side in FIG. Moreover, let the upper side in FIG. 1 be the upper side of the rice cooker 1, and define the lower side in FIG.

  The rice cooker 1 cooks rice using electricity. The rice cooker 1 mainly includes an inner pot 10, a rice cooker body 20, a lid 30, and a control device 40.

  The inner pot 10 is a cooking container for cooking rice. The inner pot 10 is formed in a bottomed cylindrical shape with a round bottom. Since the inner pot 10 is a curved surface with a round bottom, heat transfer efficiency is excellent.

  The rice cooker body 20 is a structure that heats the inner pot 10 from the circumferential direction and the lower direction. The outer case 21, the shoulder member 22, and the bottom member 23 constitute the appearance of the rice cooker 1. That is, the outer case 21, the shoulder member 22, and the bottom member 23 can be said to be a casing of the rice cooker 1. In addition to the inner pot 10, the components constituting the rice cooker body 20 are housed inside the casing. For example, the control board 41, the operation board 42, the center sensor 45, the rice cooking heater 51, the heat retaining heater 52, and the like are accommodated at appropriate positions. In the rice cooker 1, an operation panel 60 is provided on the front portion of the shoulder member 22. Further, a hinge 22h is provided at the rear portion of the shoulder member 22.

  The lid 30 is a structure that heats the inner pot 10 from above and adjusts the internal pressure. The lid 30 is attached to the above-described hinge 22h and can be opened and closed in the vertical direction around the hinge 22h. The lid member 31 constitutes the appearance of the rice cooker 1. That is, the lid member 31 can be said to be a housing of the rice cooker 1. Each component constituting the lid 30 is housed inside the housing. For example, a lid heater 53, a heat sink 54, and the like are accommodated at appropriate positions. In addition, in this rice cooker 1, although the operation panel 60 is provided in the shoulder member 22, what was provided in the cover body 30 also exists.

  The control device 40 controls each component constituting the rice cooker body 20 and the lid body 30. The control device 40 includes a control board 41, an operation board 42, and the like. The control board 41 controls the heating unit based on an instruction from the operation board 42. The operation board 42 instructs the setting to the control board 41 based on a user operation. That is, the control device 40 controls the heating unit based on the user's operation. Here, the “heating means” refers to the rice cooking heater 51, the heat retaining heater 52, and the lid heater 53 described above.

  Various electric circuits are configured on the control board 41. For example, the rice heater driving circuit 411, the heat retaining heater driving circuit 412, and the lid heater driving circuit 413 (see FIGS. 2 and 5). The control board 41 is provided with a control board unit capable of controlling the rice cooking heater 51, the heat retaining heater 52, and the lid heater 53. In addition to the electrical circuit described above, a temperature detection circuit 414 is connected to the control board unit (see FIGS. 2 and 5).

  With such a configuration, the control board unit can control the outputs of the rice cooking heater 51, the heat retaining heater 52, and the lid heater 53 as heating means. If demonstrating it concretely, the control board unit can control the emitted-heat amount of the rice cooking heater 51 via the rice cooking heater drive circuit 411. FIG. Similarly, the control board unit can control the heat generation amount of the heat retaining heater 52 and the lid heater 53.

  On the other hand, the operation board 42 also includes various electric circuits. For example, a clock signal generation circuit 421 (see FIGS. 2 and 5). The operation board 42 is provided with an operation board unit in which a control program is stored. In addition to the electric circuit described above, the operation board unit is connected to a rice cooking switch terminal 422, a heat retention switch terminal 423, an hour reservation switch terminal 424, a minute reservation switch terminal 425, and the like (see FIGS. 2 and 5).

  With such a configuration, the operation board unit can instruct the control board 41 to set the user. If it demonstrates concretely, the operation board | substrate unit can instruct | indicate the setting determined by the user operating the rice cooking switch terminal 422, the heat retention switch terminal 423, the hour reservation switch terminal 424, the minute reservation switch terminal 425, etc. to the control board 41. Further, the operation board unit can instruct the display contents of the liquid crystal panel 75.

  Next, the control system of the rice cooker 1 which concerns on 1st embodiment is demonstrated.

  FIG. 2 is a diagram illustrating a control system of the rice cooker 1 according to the first embodiment. Here, for simplicity, description will be made using a simplified diagram.

  The microcomputer 400 constituting the control system includes a control board unit of the control board 41 and an operation board unit of the operation board 42. The microcomputer 400 includes a rice cooking heater drive circuit 411, a heat retaining heater drive circuit 412, a lid heater drive circuit 413, a temperature detection circuit 414, a clock signal generation circuit 421, a zero cross circuit 431, a rectifier circuit 432, a microcomputer power supply circuit 433, and the like. It is connected. Further, the microcomputer 400 is connected to each of the switch terminals 422, 423, 424, 425, the liquid crystal panel 75, the light emitting diode 76, and the like. Furthermore, in this embodiment, an input voltage detection circuit 441 is connected as input voltage detection means. Below, the main electric circuits will be briefly described.

  The rice cooker drive circuit 411 is provided on the AC line from the plug 46 to the rectifier circuit 432. When the trigger voltage is applied to the gate terminal of the triac, the rice cooker drive circuit 411 is turned on / off. In this way, electricity is supplied to the rice cooking heater 51.

  The heat retaining heater drive circuit 412 is provided on the AC line from the plug 46 to the rectifier circuit 432. When the trigger voltage is applied to the gate terminal of the triac, the heat retaining heater driving circuit 412 turns the triac on / off. In this way, electricity is supplied to the heat retaining heater 52.

  The lid heater drive circuit 413 is provided on the AC line from the plug 46 to the rectifier circuit 432. The lid heater drive circuit 413 turns the triac on / off when a trigger voltage is applied to the gate terminal of the triac. In this way, electricity is supplied to the lid heater 53.

  The input voltage detection circuit 441 is provided on the AC line from the plug 46 to the rectifier circuit 432. The input voltage detection circuit 441 rectifies the divided AC voltage with a diode and detects a current. Thus, a signal corresponding to the input voltage is sent to the microcomputer 400.

  Next, a control mode when the input voltage changes will be described.

  FIG. 3 is a diagram illustrating a control flow of the rice cooker 1 according to the first embodiment. FIG. 4 is a diagram illustrating a control mode when the input voltage changes. Here, it is assumed that it is used in an area (Japan, etc.) with a rated voltage of 100 volts.

  This rice cooker 1 is adjusting the output electric energy by switching a heating means with an operation state and a non-operation state. If demonstrating it concretely, this rice cooker 1 will adjust each output electric energy by turning ON / OFF the rice cooker 51, the heat retention heater 52, and the lid | cover heater 53. FIG. Below, it demonstrates paying attention to the control aspect of the rice cooking heater 51. FIG.

  As shown in FIG. 3, first, the microcomputer 400 acquires a preset energization time (a part of the control mode) stored in advance (step S101). Here, the set energization time is a ratio of the operation time Ta and the non-operation time Tb of the rice cooking heater 51 when the rated voltage is 100 volts. Next, the microcomputer 400 grasps the input voltage (step S102). Then, the microcomputer 400 corrects the set energization time according to the input voltage (step S103). Thereafter, the microcomputer 400 performs control so that the set energization time after correction is reached (step S104). This will be specifically described below.

  FIG. 4A shows a control mode when the input voltage is 100 volts. In this case, the control device 40 sets the ratio of the operation time Ta and the non-operation time Tb of the rice cooker 51 to 13.0 / 3.0. That is, the microcomputer 400 of the control device 40 performs control so that the duty ratio of the rice cooking heater 51 is 13.0 / 16.0. This means that when the input voltage is 100 volts and the duty ratio is 13.0 / 16.0, a desired output power amount can be secured. In this rice cooker 1, the unit time Tu (Ta + Tb) is set to 16.0 seconds because the control program is created in hexadecimal. Therefore, the unit time Tu is not limited.

  FIG. 4B shows a control mode when the voltage of the commercial power supply changes and the input voltage becomes 90 volts. In this case, the control device 40 sets the ratio of the operation time Ta and the non-operation time Tb of the rice cooker 51 to 16.0 / 0.0. That is, the microcomputer 400 of the control device 40 performs control so that the duty ratio of the rice cooking heater 51 is 16.0 / 16.0. This means that even if the voltage of the commercial power supply is changed and the input voltage is changed from 100 volts to 90 volts, the same output power amount can be secured if the duty ratio is 16.0 / 16.0. The reason why the duty ratio is 16.0 / 16.0 is as follows.

That is, if the calorific value, which is synonymous with the amount of output power, is H, the voltage is V, the time is T, and the constant is A, the following mathematical formula Ma is established. Here, since the time T is the operation time Ta per unit time Tu which is a duty ratio, the following formula Mb is derived. If the heat generation amount when the input voltage is 100 volts and the heat generation amount H when the input voltage is 90 volts are equal, the following formula Mc is established. As described above, since the operating time Ta is 16.0 seconds, the duty ratio is determined to be 16.0 / 16.0.
Formula Ma: H = AV ² T
Formula Mb: H = AV ² (Ta / Tu)
Formula Mc: Ta = 13.0 (100/90) ²

  FIG. 4C shows a control mode when the voltage of the commercial power supply changes and the input voltage becomes 110 volts. In this case, the control device 40 sets the ratio of the operation time Ta and the non-operation time Tb of the rice cooker 51 to 10.7 / 5.3. That is, the microcomputer 400 of the control device 40 controls the duty ratio of the rice cooking heater 51 to be 10.7 / 16.0. This means that even if the voltage of the commercial power supply is changed and the input voltage is changed from 100 volts to 110 volts, the same output power amount can be ensured if the duty ratio is 10.7 / 16.0. The reason why the duty ratio is 10.7 / 16.0 is as follows.

That is, the heat generation amount H is expressed by the following mathematical formula Ma. Since the time T is the operation time Ta per unit time Tu, the following formula Mb is derived. If the heat generation amount when the input voltage is 100 volts and the heat generation amount H when the input voltage is 110 volts are equal, the following formula Mc is established. As described above, since the operation time Ta is 10.7 seconds, the duty ratio is determined to be 10.7 / 16.0.
Formula Ma: H = AV ² T
Formula Mb: H = AV ² (Ta / Tu)
Formula Mc: Ta = 13.0 (100/110) ²

  With such a control mode, the rice cooker 1 can make the output power amount per unit time Tu constant even if the input voltage changes. Thereby, since the amount of heat transmitted to the object to be cooked is the same, it becomes possible to exhibit the original cooking performance.

  In this rice cooker 1, the operation time Ta is calculated based on the above mathematical formula. Therefore, the duty ratio can be determined according to the detected input voltage. However, the duty ratio for each input voltage may be stored in the storage medium, and the duty ratio may be switched according to the detected input voltage. In this case, the duty ratio is switched depending on whether the detected input voltage is larger or smaller than the threshold value. The technical idea of the present invention can be applied regardless of the rated voltage. Therefore, it can be applied regardless of whether the rated voltage is 100 volts (100 volts to 120 volts) or 200 volts (220 volts to 240 volts).

  Next, the control system of the rice cooker 1 which concerns on 2nd embodiment is demonstrated.

  FIG. 5 is a diagram illustrating a control system of the rice cooker 1 according to the second embodiment. Here, only a different part from the control system of the rice cooker 1 which concerns on 1st embodiment is demonstrated.

  The control system of the rice cooker 1 according to the second embodiment does not include the input voltage detection circuit 441. However, in this embodiment, a control mode storage unit 442 is provided as a control mode storage unit.

  The control mode storage unit 442 is a storage medium provided in the microcomputer 400. The control mode storage unit 442 stores a control mode according to the rated voltage in the area where use is planned. For example, when the use is planned in an area where the rated voltage is 100 volts (such as Japan), the control mode at the rated voltage of 100 volts is stored. In addition, the control aspect according to the rated voltage of the area where use is planned is written in the production process of the rice cooker 1.

  Next, a control mode for each region having different rated voltages will be described.

  FIG. 6 is a diagram illustrating a control flow of the rice cooker 1 according to the second embodiment. FIG. 7 is a diagram illustrating a control mode for each region having different rated voltages. Here, it is assumed that the rated voltage is used in an area of 100 volts (Japan, etc.), an area of 110 volts (Korea, etc.), and an area of 120 volts (USA, etc.).

  As shown in FIG. 6, first, the microcomputer 400 acquires a preset energization time (a part of the control mode) stored in advance (step S201). And the microcomputer 400 performs control so that it may become the acquired setting energization time (step S202). This will be specifically described below.

  As above-mentioned, this rice cooker 1 adjusts each output electric energy by turning on / off the rice cooker heater 51, the heat retention heater 52, and the lid | cover heater 53. As shown in FIG. Below, it demonstrates paying attention to the control aspect of the rice cooking heater 51. FIG.

  FIG. 7A shows a control mode in the case where the rated voltage is used in an area of 100 volts (Japan, etc.). In this case, the control device 40 sets the ratio of the operation time Ta and the non-operation time Tb of the rice cooker 51 to 13.0 / 3.0. That is, the control apparatus 40 controls the duty ratio of the rice cooker 51 to be 13.0 / 16.0.

  FIG. 7B shows a control mode when used in an area where the rated voltage is 110 volts (such as Korea). In this case, the control device 40 sets the ratio of the operation time Ta and the non-operation time Tb of the rice cooker 51 to 10.7 / 5.3. That is, the microcomputer 400 of the control device 40 controls the duty ratio of the rice cooking heater 51 to be 10.7 / 16.0. This means that even if the rated voltage is 110 volts instead of 100 volts, the same output power can be secured if the duty ratio is 10.7 / 16.0. The reason why the duty ratio is 10.7 / 16.0 is as follows.

That is, the heat generation amount H is expressed by the following mathematical formula Ma. Since the time T is the operation time Ta per unit time Tu, the following formula Mb is derived. If the heat generation amount when the input voltage is 100 volts and the heat generation amount H when the input voltage is 110 volts are equal, the following formula Mc is established. As described above, since the operation time Ta is 10.7 seconds, the duty ratio is determined to be 10.7 / 16.0.
Formula Ma: H = AV ² T
Formula Mb: H = AV ² (Ta / Tu)
Formula Mc: Ta = 13.0 (100/110) ²

  FIG.7 (c) represents the control aspect in the case of using in the area | region (USA etc.) whose rated voltage is 120 volts. In this case, the control device 40 sets the ratio of the operation time Ta and the non-operation time Tb of the rice cooker 51 to 9.0 / 7.0. That is, the microcomputer 400 of the control device 40 performs control so that the duty ratio of the rice cooking heater 51 is 9.0 / 16.0. This means that even if the rated voltage is 120 volts instead of 100 volts, the same output power can be secured if the duty ratio is 9.0 / 16.0. The reason why the duty ratio is 9.0 / 16.0 is as follows.

That is, the heat generation amount H is expressed by the following mathematical formula Ma. Since the time T is the operation time Ta per unit time Tu, the following formula Mb is derived. If the heat generation amount when the input voltage is 100 volts and the heat generation amount H when the input voltage is 120 volts are equal, the following formula Mc is established. As described above, since the operation time Ta is 9.0 seconds, the duty ratio is determined to be 9.0 / 16.0.
Formula Ma: H = AV ² T
Formula Mb: H = AV ² (Ta / Tu)
Formula Mc: Ta = 13.0 (100/120) ²

  According to such a control mode, the rice cooker 1 can adjust the output power amount per unit time Tu to be constant even when used in an area where the rated voltage is different. Thereby, since the amount of heat transmitted to the object to be cooked does not change, the original cooking performance can be exhibited.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to exhibit cooking performance in the area | region where a rated voltage is a 100 volt system (100 volts-120 volts). This means that a region with a rated voltage of 100 volts (100 volts to 120 volts) can be shared by one electric heater. This eliminates the need to set an electric heater for each region, thereby reducing the production cost. Further, the technical idea of the present invention can be applied even in an area of 200 volts (220 volts to 240 volts). Therefore, it is possible to share a region with a rated voltage of 200 volts (220 to 240 volts) with one electric heater.

  Next, the other feature point of this rice cooker 1 is demonstrated.

  FIG. 8 is a diagram showing a control mode in the temperature raising step. The temperature raising step refers to a step of heating the inner pot 10 with the amount of heat generated by the rice cooker heater 51 as a maximum.

  In the conventional rice cooker, the temperature rise control in the temperature raising step is performed every 28 seconds. That is, in the conventional rice cooker, the control for increasing the temperature step by step is performed every 28 seconds. In this case, if the unit time Tu is set to 16.0 seconds and the control for changing the ratio of the operating time Ta and the non-operating time Tb of the rice cooker 51 is applied, the remaining 12.0 seconds are all in an operating state. (See the shaded area).

  In order to solve such a problem, the rice cooker 1 performs control for increasing the temperature step by step every multiple of the unit time Tu. If it demonstrates concretely, in this rice cooker 1, it was supposed that in the temperature rising process, control for increasing the temperature stepwise was performed every 32.0 seconds, which is twice the unit time Tu.

  With such a control mode, the rice cooker 1 can apply control for changing the ratio of the operation time Ta and the non-operation time Tb of the rice cooker 51 over the entire period of the temperature raising process. As a result, even when the input voltage changes or when the rated voltage is used in different areas, the amount of heat transferred to the object to be cooked is the same. It becomes possible to plan.

1 Rice cooker (heating cooker)
DESCRIPTION OF SYMBOLS 10 Inner pan 20 Rice cooker main body 30 Cover body 40 Control apparatus 51 Rice cooker heater 52 Thermal insulation heater 53 Cover heater Ta Operation time Tb Non-operation time Tu Unit time

Claims (4)

Heating means for heating the cooking object;
A heating cooker comprising a control device for controlling the heating means,
The said control apparatus changes the ratio of the operating time of the said heating means, and the non-operation time, and adjusts the output electric energy per unit time of this heating means, The cooking device characterized by the above-mentioned.   The control device includes an input voltage detection unit that detects an input voltage, changes a ratio between an operation time and a non-operation time of the heating unit according to the detected input voltage, and outputs an output per unit time of the heating unit. The cooking device according to claim 1, wherein the amount of electric power is constant.   The control device includes a control mode storage unit that stores a control mode according to a rated voltage, and changes a ratio between an operation time and a non-operation time of the heating unit according to the stored control mode. The cooking device according to claim 1, wherein the output power amount per unit time is made constant.   4. The control device according to claim 1, wherein the control device performs control to raise the temperature step by step every multiple time of the unit time in the temperature raising step. 5. Cooking cooker.

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