JP2008188344A - rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small and inexpensive rice cooker in which a proper power source can be surely supplied in a simple structure to a component in accordance with rice cooking sequence. <P>SOLUTION: In the rice cooker, a power source forming circuit forms at least two different kinds of power source voltages, one for drive-controlling a water feeding means that jets steam into an inner pot and the other for drive-controlling a heating coil for induction-heating the inner pot, wherein either one of the power source voltages is designed to be outputted in accordance with rice cooking sequence. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rice cooker having a power supply circuit that generates various power supply voltages for internal components.

In recent years, household appliances are light and small, and energy saving is an important issue. For example, in rice cookers, light weight intended to reduce standby power when not in operation Various small rice cookers have been proposed (see, for example, Patent Document 1). In addition, in recent rice cookers for household appliances, in order to cook rice deliciously, the heating conditions such as heating temperature, heating time, and heating position are appropriately controlled, and the structure of the inner pot of the rice cooker and its lid, etc. Proposals have been made on various materials and shapes. For example, a rice cooker (for example, refer to Patent Document 2) that heats the rice in the upper opening of the inner pot by providing an induction heating coil as a heat source on the lid, or steam at a high temperature for the rice in the inner pot. A rice cooker (see, for example, Patent Document 3) that sprays and promotes the gelatinization (α conversion) of rice by preventing the drying of the rice has been proposed.
Japanese Patent Laid-Open No. 11-318700 Japanese Patent No. 2988050 JP 2005-160917 A

  As mentioned above, reducing the number of parts is an important issue in order to save energy and reduce the size and weight of electrical appliances. In particular, in the field of rice cookers, induction heating coils for heating to high temperatures are included. Since it is provided around the pot and in the lid, a heat insulation mechanism, an electromagnetic shielding mechanism, and the like are required, and there has been a tendency to become a large rice cooker composed of heavy objects. Moreover, in a rice cooker for home use, it is an important issue that is always required to reduce the manufacturing cost and to reduce the price as much as possible. However, in a rice cooker for home use, it is necessary to provide various functions in response to a user's request, and as a result, the number of components increases and the manufacturing cost increases. As one method for solving such a problem, for example, in order to reduce the manufacturing cost, a commonly used part distributed in the market as much as possible is used without using a special part. Is to use. However, in order to incorporate such parts, the specifications differ for each part, and in particular, the power supply voltage may be different for each part. Therefore, a circuit for forming various power supply voltages in the rice cooker is required. It was necessary to install. Thus, the formation of various power supply voltages has been a problem in terms of cost reduction and size reduction.

  The present invention is a small, low-cost, high-performance rice cooker configured with low-cost components and capable of reliably supplying an appropriate power source with a simple configuration to the components according to the rice cooking sequence. The purpose is to provide a rice cooker.

In order to achieve the above object, the rice cooker according to the first aspect of the present invention comprises:
An inner pot that is detachably stored in the rice cooker body,
Steam generating means for evaporating water and emitting it into the inner pot;
A water storage container for storing water to be supplied to the steam generating means;
Water supply means for supplying water from the water storage container to the steam generating means;
A heating coil for inductively heating the inner pot;
An energization control unit for controlling a current flowing in the heating coil;
A drive unit for driving the energization control unit;
It is possible to form at least two different power supply voltages, ie, a power supply voltage for driving and controlling the water supply means and a power supply voltage for driving and controlling the heating coil, and one power supply voltage according to the rice cooking sequence. A power supply forming circuit that forms and outputs only the power, a drive unit, the steam generation means, the water supply means, and a control means for driving and controlling the power supply formation circuit according to a rice cooking sequence. The rice cooker of this invention comprised in this way can comprise easily the power supply circuit for components as much as possible according to a rice cooking sequence.

  A rice cooker according to a second aspect of the present invention includes a voltage switching circuit in which the power supply forming circuit according to the first aspect is configured by connecting in parallel at least two series circuits of a Zener diode and a switching element, At least two different power supply voltages output from the voltage switching circuit are set by each Zener voltage of the Zener diode. In the rice cooker of this invention comprised in this way, a desired power supply voltage is output with high precision from a power supply formation circuit.

  The rice cooker of the 3rd viewpoint of this invention WHEREIN: The power supply formation circuit in the said 1st viewpoint or the 2nd viewpoint is a power supply voltage for drive-controlling a water supply means, and a power supply for drive-controlling a heating coil A power supply voltage for a standby state lower than any of the voltages is formed, and the power supply voltage for the standby state is output at a time other than the rice cooking operation. The rice cooker of this invention comprised in this way can suppress power consumption significantly in standby states other than rice cooking operation | movement.

  The rice cooker according to a fourth aspect of the present invention is configured such that, in the configuration according to the third aspect, the power source forming circuit outputs a standby power voltage in a rice cooking reservation state from rice cooking reservation setting to rice cooking start. Yes. Since the rice cooker of this invention comprised in this way is set to a standby state in a rice cooking reservation state, it can suppress power consumption.

  The rice cooker according to a fifth aspect of the present invention further includes a fixed power output circuit that receives the output of the power supply forming circuit in the configuration according to the first to third aspects to form a predetermined voltage, and the fixed The output of the power output circuit is configured to be the power source of the control means. In the rice cooker of the present invention configured as described above, since the fixed power output circuit uses the output from the low voltage output circuit, the circuit configuration is simplified, and heat generation due to step-down can be suppressed, and Since there is no need to increase the insulation distance, the circuit can be formed small.

  In the rice cooker according to the sixth aspect of the present invention, the steam generating means according to the first to third aspects includes a steam generating part for storing water from the water supply means and steam input for emitting steam into the inner pot. A heating plate having a mouth and a heating coil for induction heating the heating plate. The rice cooker of this invention comprised in this way can spray water vapor | steam on rice in rice cooking operation | movement, and creation of a more delicious rice is attained.

  A rice cooker according to a seventh aspect of the present invention is a heating system comprising the steam generating means according to the sixth aspect provided in a lid rotatably attached to the rice cooker body, and having a steam generating part and a steam inlet. A plate is disposed on the inner surface of the lid facing the inner pot, and a heating coil is disposed in the vicinity of the steam generating portion. The rice cooker of this invention comprised in this way can generate | occur | produce a vapor | steam efficiently in the steam generation part of a heating plate.

  A rice cooker according to an eighth aspect of the present invention is a water storage container in which the water supply means according to the sixth aspect is provided in a lid provided rotatably on a rice cooker body, and is detachably provided on the lid. Is supplied to the steam generating part of the heating plate in accordance with a command from the control means. The rice cooker of this invention comprised in this way can supply water appropriately according to a rice cooking sequence with respect to the steam generation part of a heating plate.

  In the rice cooker according to the ninth aspect of the present invention, the water supply means according to the sixth aspect is provided with a liquid rolling pump between the flow paths from the water storage container to the steam generating section. The rice cooker of the present invention configured as described above can reliably supply water to the steam generating unit by the liquid rolling pump, and the arrangement of other components for routing water supply from the water storage container to the steam generating unit. It becomes possible to set freely according to.

  A rice cooker according to a tenth aspect of the present invention is configured such that the water supply means in the sixth aspect is provided with an open / close valve in a water supply hole of the water storage container, and the open / close valve is opened and closed by a solenoid valve. ing. The rice cooker of this invention comprised in this way can supply the water of a water storage container reliably with respect to a steam generation part.

  The rice cooker according to an eleventh aspect of the present invention includes an IGBT in which the energization control unit according to the first aspect to the tenth aspect controls a heating coil, and the heating coil is not operating in the rice cooking sequence. The off signal is input from the drive unit to the gate terminal of the IGBT, and the current to the heating coil is cut off. In the rice cooker of the present invention configured as described above, the current to the heating coil is reliably interrupted when the heating coil is not operating in the rice cooking sequence.

  A rice cooker according to a twelfth aspect of the present invention includes a power supply voltage for driving and controlling the water supply means and a power supply for driving and controlling the heating coil by the power supply forming circuit according to the first to tenth aspects. The switching of the output with the voltage is performed after a predetermined time has elapsed from the input of the switching signal. The rice cooker of this invention comprised in this way becomes a structure which can start each element reliably, without malfunctioning at the time of switching to a water supply means and a heating coil.

  In a rice cooker according to a thirteenth aspect of the present invention, the rice cooker according to the first to tenth aspects further includes a voltage detection circuit, and the voltage detection circuit is formed in a power supply forming circuit. The power supply voltage for driving and controlling the power supply voltage and the power supply voltage for driving and controlling the heating coil are detected. The rice cooker of this invention comprised in this way becomes a structure which can start each element after each power supply voltage is formed correctly at the time of switching to a water supply means and a heating coil.

  In a rice cooker according to a fourteenth aspect of the present invention, the power supply forming circuit according to the first aspect to the tenth aspect drives and controls the first set power supply voltage for driving and controlling the supply means and the heating coil. The second set power supply voltage for switching, and the third set power supply voltage when the water supply means and the heating coil are not in operation are switched and output, and the first set power supply voltage is the most High and the third set power supply voltage is set to the lowest. The rice cooker of the present invention configured as described above can significantly reduce power consumption in the rice cooking operation.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to comprise a high-function rice cooker with a low-cost component, and provides a small and low-price rice cooker that supplies an appropriate power source to the component with a simple configuration. can do.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the rice cooker of the invention will be described with reference to the accompanying drawings. In the embodiment described below, the features of the present invention will be described in detail. However, the disclosed contents in this embodiment should be changed in the details of the configuration, and each component These combinations and changes in the order can be realized without departing from the scope of the claims and the technical idea of the present invention.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view showing a schematic configuration of the rice cooker according to Embodiment 1 of the present invention. FIG. 2 is a structural diagram showing the inside of the lid by removing a part of the lid of the rice cooker of the first embodiment.

  The rice cooker of Embodiment 1 shown in FIG. 1 includes a rice cooker body 1 that detachably houses a pot-shaped inner pot 3 in which a food is to be placed, and a lid that is pivotally fixed to the rice cooker body 1. 2. The lid 2 constitutes the upper part of the rice cooker, and when the lid 2 is closed, the opening portion (upper opening portion) of the inner pot 3 is covered with the lid 2. The rice cooker main body 1 is formed with an inner pot storage portion 4 for storing the inner pot 3. The inner hook storage portion 4 is a bottomed cylindrical shape having a curved surface similar to the bottom surface of the inner hook, and the outer surface of the inner hook 3 stored in the inner hook storage portion 4 and the inner surface of the inner hook storage portion 4 (opposing the inner hook 3). Are configured to be in close contact with each other.

  Inside the rice cooker body 1, an inner pot heating coil 5 which is an inner pot heating means for induction heating the inner pot 3 is provided. In the rice cooker according to the first embodiment, the inner pot heating coil 5 includes a side heating coil 5a for induction heating the side section of the inner pot 3 and a bottom heating coil 5b for induction heating the bottom section of the inner pot 3. Yes. Further, an inner hook temperature sensor 6 serving as an inner hook temperature detecting means is provided in contact with a substantially central portion of the outer surface of the bottom of the inner hook 3 stored in the inner hook storage portion 4. The inner pot temperature sensor 6 constantly detects the temperature of the inner pot at the time of cooking and keeping warm, and the detection data is transmitted to a control unit which will be described later, and the food in the inner pot 3 is controlled to an optimum temperature state. The

  A display unit 7 and an operation unit 8 are provided on the front side of the rice cooker body 1 (left side in FIG. 1). The display unit 7 displays various information to be notified to the user in the rice cooking such as the current operation status display of the rice cooker, the course display at the time of setting, the rice seed display, the cooking time display, and the like on a liquid crystal display or the like. It is configured as follows. In addition, the rice cooker has a notification means, for example, a voice generation mechanism that informs the user of the cooking status by voice, a buzzer or melody that informs the user of the current situation by the difference in tone, in order to inform the user of various information by voice or sound. A sound generating mechanism such as a vessel is provided. A user's command from the operation unit 8 (rice cooking reservation data), detection data from various detection means provided inside the rice cooker, and the like are a microcomputer (hereinafter abbreviated as a microcomputer) provided inside the rice cooker. Are input to the control unit (see FIG. 7) and processed. Based on the processing result, the control unit selects an appropriate rice cooking sequence in the rice cooker and drives and controls various components in the rice cooker.

  The lid 2 constituting the upper part of the rice cooker is rotatably connected to the rice cooker body 1 via a hinge portion 7 and is configured to open and close the inner pot 3 in the rice cooker body 1. A hook button 9 is provided at a position opposite to the hinge portion 7 in the lid 2, and the hook button 9 is engaged with an engaging portion 10 provided in the rice cooker body 1 so that the lid 2 is cooked. The main body 1 is configured to be in a closed state. At the time of opening, the user presses the hook button 9 from above to release the locking state between the hook button 9 and the engaging portion 10, and the cover 2 is opened by a spring that always presses the cover 2 in the opening direction. The

  The upper surface of the lid 2 is formed of an upper surface lid 11 made of synthetic resin, and the lower surface is composed of a lower surface lid 12 made of synthetic resin. A lid heating coil 13 which is an induction heating coil is provided on the inner surface side (upper surface side in FIG. 1) of the lower surface lid 12. Further, a lid heating plate 14 is disposed on a surface (the lower surface side in FIG. 1) of the lower surface lid 12 facing the inner pot 3, and a portion immediately below the lid heating coil 13 in the lid heating plate 14 is a steam generating portion 14a. It has become. The steam generating part 14a is formed in a recess and has a structure in which water for evaporating is temporarily held. In the first embodiment, the lid heating coil 13 and the lid heating plate 14 constitute vapor generating means.

  As shown in FIG. 1, a water storage container 15 is detachably attached to the upper surface lid 11 of the lid 2. The water storage container 15 stores water to be supplied to the lid heating plate 14, and the water in the water storage container 15 is sucked by a water supply means 16, for example, a pump, and supplied to the steam generation unit 14 a of the lid heating plate 14. The The pump of the water supply means 16 used in Embodiment 1 is a liquid rolling pump. This liquid rolling pump is a diaphragm-driven small pump, and 12V is a power supply voltage. As described above, in the first embodiment, since the liquid rolling pump is used as the water supply means 16, the water supply from the water storage container 15 to the lid heating plate 14 can be freely routed according to the arrangement of other components. It becomes possible to set.

FIG. 2 is a structural diagram showing the inside of the lid 2 by removing the lower surface lid 12, the lid heating coil 13, the lid heating plate 14 and the like in the lid 2 of the rice cooker according to the first embodiment, and is viewed from the lower side of the lid 2. It is a figure. As shown in FIG. 2, the liquid rolling pump as the water supply means 16 sucks water from the water storage container 15 attached to the substantially central portion of the lid 2 by the suction hose 16a and sends the water to the supply hose 16b. . The supply hose 16b is connected so as to supply water to the evaporation part 14a of the lid heating plate 14 omitted in FIG.
In the present invention, when the steam generation part 14a of the lid heating plate 14 is arranged directly below the water storage container 15, the water supply is controlled by using a channel opening / closing means such as an electromagnetic valve as the water supply means. Is possible.

  In the rice cooker according to the first embodiment, the lid heating plate 14 is detachably attached to the lower surface lid 12 of the lid 2, and the lid heating plate 14 can be cleaned. An inner hook seal packing 17 (see FIG. 1) is provided on the outer peripheral portion of the lid heating plate 14 for sealing with the inner hook 3. The lid heating plate 14 has a steam generating portion 14a disposed at a position facing the lid heating coil 13 and a steam inlet 14b, and is formed by press molding of magnetic stainless steel. The steam generation unit 14 a is a part that stores water supplied by the water supply means 16 and is heated by the lid heating coil 13 to generate steam. The steam inlet 14b has an opening through which the steam generated by the steam generator 14a is emitted to the food in the inner pot 3.

  In order to seal the steam generation space formed by the lower surface lid 12 and the lid heating plate 14, an outer packing 18 that defines the outer peripheral portion of the steam generation space and an inner packing 19 that defines the inner peripheral portion of the steam generation space are provided. Is provided. Inside the inner packing 19, an inlet 20a of a steam tower 20 is provided for releasing steam when steam generated during rice cooking in the inner pot 3 exceeds a predetermined pressure. A steam port 21 serving as a discharge port of the steam tower 20 is formed in the approximate center of the top cover 11 and discharges steam having a predetermined pressure or higher generated during rice cooking to the outside air.

  In the rice cooker according to the first embodiment configured as described above, the control unit (see FIG. 7) configured with a microcomputer is based on an instruction from the operation unit 8 by the user, etc. The part 7, the lid heating coil 13, the water supply means 16, the element cooling fan motor, and the like are appropriately controlled according to the designated rice cooking sequence to perform the rice cooking operation. The control means in the present invention includes a microcomputer, a display unit 7, and an operation unit 8.

  Next, the rice cooking operation in the rice cooker of the first embodiment will be specifically described. FIG.3 and FIG.4 is a flowchart explaining the rice cooking operation | movement in the rice cooker of Embodiment 1. FIG. FIG. 5 is a flowchart for explaining another example of the rice cooking operation in the rice cooker of the first embodiment. FIG. 6 shows the operating conditions of the heating coil and water supply means in the rice cooking operation of the rice cooker of the first embodiment, and the transition of the inner pot temperature.

  As the previous stage of the rice cooking operation, the inner pot 3 holding a set amount of rice and water as a cooked product is stored in the inner pot storage section 4 of the rice cooker body 1, the lid 2 is closed, and the desired rice cooking sequence is operated. Set by the user in part 8. At this time, water is supplied to the water storage container 15 up to a predetermined water level.

  In the rice cooker, when the rice cooking operation shown in FIG. 3 is started, an initial abnormality detection operation is first performed in step S1. In this initial abnormality detection operation, the rice cooking operation such as whether the water in the inner pot is higher than a predetermined temperature (for example, 70 ° C. or higher) or whether the lid heating plate 14 is higher than the predetermined temperature (for example, 70 ° C. or higher). It is determined during a predetermined time whether the initial rice cooking start condition is satisfied (for example, in the rice cooker of Embodiment 1, the initial detection operation is performed for 16 seconds). When the above rice cooking start condition is not satisfied, the rice cooking operation cannot be performed normally, and the control unit forcibly ends the rice cooking operation of the rice cooking sequence according to a predetermined program.

  If the said rice cooker satisfy | fills the rice cooking start conditions in step S1, it will determine with it being normal rice cooking operation | movement, and will transfer to the water absorption process of step S2. In the water absorption step, the liquid rolling pump that is the water supply means 16 is operated. The water supply unit 16 supplies the water in the water storage container 15 to the steam generation unit 14 a of the lid heating plate 14 based on a command from the control unit. Details of the water absorption step will be described later. When the water absorption process of step S2 is completed, the cooking process of step S3 is performed, and the heat treatment is performed at a stretch with high heating power by the inner pot heating coil 5 and the lid heating coil 13.

  When the cooking process in step S3 ends, the process proceeds to the steaming process in step S4. In the steaming step, the lid heating plate 14 is heated by the lid heating coil 13 to boil the water in the steam generation part 14a and generate high-temperature steam. And the steaming process of step S4 will be complete | finished when predetermined time passes, and will complete rice cooking operation | movement.

  As mentioned above, in the rice cooker of Embodiment 1, although rice cooking operation | movement is performed according to a rice cooking sequence, the water absorption process in the rice cooking operation | movement is demonstrated. FIG. 4 is a flowchart showing each step of the water absorption process in the rice cooking operation.

  In the rice cooking operation of the rice cooker, when it is determined as the normal rice cooking operation by the initial abnormality detection operation of the rice cooking operation as described above, the process proceeds to the water absorption process. In the water absorption process, first, the liquid rolling pump as the water supply means 16 is operated in step S21. At this time, the inner pot heating coil 5 and the lid heating coil 13 are in an inoperative state in which no current flows. The water supply means 16 supplies the water stored in the water storage container 15 to the steam generation part 14a of the lid heating plate 14 via the suction hose 16a and the supply hose 16b based on a command from the control part. Since the liquid rolling pump as the water supply means 16 has a substantially constant water supply amount per unit time, the operation time of the water supply means 16 is measured by the control unit, and the water supply means 16 is measured after a predetermined water supply time has elapsed. (Step S22). By controlling the water supply means 16 in this way, it is possible to reliably supply an appropriate amount of water necessary for the rice cooking operation using high-temperature steam to the steam generation unit 14a. In addition, the liquid rolling pump which is the water supply means 16 used in Embodiment 1 is a small liquid pump which starts with a power supply voltage of 12V.

  When it is detected in step S22 of FIG. 4 that the water supply time (10 seconds in the first embodiment) has elapsed since the start of the water supply means 16, the water supply operation by the water supply means 16 is terminated. In step S23, the inner pot 3 is heated by the inner pot heating coil 5 (inner pot heating ON state).

  In the rice cooking operation, the temperature of the water in the inner pot is maintained at a temperature (about 50 ° C.) immediately before the start of gelatinization (α conversion) of the starch of rice grains for a certain period of time. It is known that water absorption takes place. Therefore, in the water absorption process of the rice cooking operation in the rice cooker of Embodiment 1, the inner pot temperature is set to be maintained at about 50 ° C. When it is detected in step 24 that a predetermined time (16 seconds in the first embodiment) has elapsed, it is determined whether the inner pot temperature has exceeded 50 ° C. (step S25). If the inner pot temperature is 50 ° C. or lower, the inner pot heating on state is continued. If it is detected in step S25 that the inner pot temperature has exceeded 50 ° C., heating to the inner pot 3 is stopped in step S26 (inner pot heating off state). After a predetermined time (16 seconds in the first embodiment) has elapsed (step S27), the inner pot temperature is measured, and if the inner pot temperature at that time exceeds 50 ° C, the inner pot heating off state is continued. (Step S28). Thus, the water absorption process with respect to the rice grain in the inner pot 3 is performed efficiently by maintaining the inner pot temperature at about 50 ° C. in the water absorption step.

  When it is detected in step 28 that the inner pot temperature has become 50 ° C. or lower, in step S29, the water absorption time is set as the water absorption time (the time during which water absorption is sufficient for the rice grains, for example, about 19 minutes depending on the amount of rice). It is determined whether or not it has elapsed. When it is determined that the water absorption time has elapsed, the process proceeds to the next cooking step (step S3). If it is determined in step S29 that the water absorption time has not passed the water absorption set time, the process proceeds to step S23, and the inner pot heating on state in which the inner pot 3 is heated is set. Thereafter, the water absorption process is continued for a water absorption set time with the inner pot temperature maintained at 50 ° C.

As described above, in the water absorption process of the rice cooker according to the first embodiment, after supplying a predetermined amount of water to the lid heating plate 14 by the water supply means 16, the operation of the water supply means 16 is stopped, Heating is on. And when the inner pot temperature is 50 ° C. and continues for the water absorption setting time, the rice grains in the inner pot 3 sufficiently absorb water. After this water absorption process is completed, the process proceeds from the water absorption process to the cooking process.
When the water absorption process at the constant temperature (50 ° C.) in the water absorption process is completed as described above, the process proceeds to the cooking process in step S3, and the heat treatment is performed on the rice in the inner pot 3 at a stretch with high thermal power.

  In addition, operation | movement of the water absorption process in the rice cooker of Embodiment 1 is not limited to the flow shown in FIG. 4, What is necessary is just the process in which the inner pot 3 maintains 50 degreeC for a predetermined time, for example in FIG. It is also possible to implement by the flow shown. FIG. 5 is a flowchart showing another example of the water absorption process in the rice cooking operation. In the flowchart of the water absorption process of FIG. 5, other processes are the same as the flowchart shown in FIG.

  In the rice cooking operation of the rice cooker shown in FIG. 5, when it is determined as the normal rice cooking operation by the initial abnormality detection operation of the rice cooking operation as described above, the process proceeds to the water absorption process. In the water absorption process, first, in step S31, the liquid rolling pump as the water supply means 16 is operated. At this time, the inner pot heating coil 5 and the lid heating coil 13 are not operating. The water supply means 16 supplies the water stored in the water storage container 15 to the steam generation part 14a of the lid heating plate 14 via the suction hose 16a and the supply hose 16b based on a command from the control part.

  In step S32 of FIG. 5, it is determined whether or not a predetermined water supply time (16 seconds in the first embodiment) has elapsed since the start of the water supply means 16, and if not, The water supply operation in step S31 is continued until it has elapsed. When the predetermined water supply time has elapsed, the water supply operation by the water supply means 16 is terminated, and the inner pot 3 is heated by the inner pot heating coil 5 (inner pot heating on state) in step S33.

  When it is detected in step S34 that a predetermined time has elapsed (for example, 16 seconds have elapsed), it is determined in step S35 whether or not the inner pot temperature has exceeded 50 ° C. If the inner pot temperature is 50 ° C or lower, heating is continued until it exceeds 50 ° C. When the inner pot temperature exceeds 50 ° C., the heating to the inner pot 3 is stopped in step S36, and the inner pot heating off state is continued while the inner pot 3 exceeds 50 ° C. When it is detected that a predetermined time has elapsed (for example, 16 seconds have elapsed) (step S37), it is determined whether or not the inner pot temperature is 48 ° C. or less (step S38). In step S38, if the inner pot temperature is 48 ° C. or less, it is determined whether or not the water absorption time has passed the water absorption set time (the time during which water absorption to the rice grains is sufficient) (step S39). If the water absorption time exceeds the water absorption set time, the process proceeds to the next cooking step (step S3).

  On the other hand, if the water absorption time has not reached the water absorption set time in step S39, the inner pot heating ON state (step S33) in which current is passed through the inner pot heating coil 5 to heat the inner pot 3 is set. Thereafter, the water absorption process is maintained for a water absorption set time with the inner pot temperature maintained at 50 ° C.

  As described above, in any water absorption process in the rice cooking operation of the rice cooker of the present invention, a predetermined amount of water is supplied to the lid heating plate 14 by the water supply means 16 and the operation of the water supply means 16 is stopped. Then, the inner pot heating is turned on. That is, the water supply means 16 is set not to operate simultaneously with the inner pot heating coil 5 and the lid heating coil 13. Then, after the water absorption process in which the inner pot temperature is 50 ° C. and the water absorption set time elapses and the rice grains sufficiently absorb water, the process proceeds from the water absorption process to the cooking process.

FIG. 6 shows operating states of the inner pot heating coil 5, the lid heating coil 13, the water supply means 16, and the element cooling fan motor 23 (see FIG. 7) in each step of the rice cooker of the first embodiment. It is a graph which shows transition in each process of an operation waveform figure and an inner pot temperature.
As shown in FIG. 6, in the initial abnormality detection operation of the rice cooking operation, only the inner pot heating coil 5 is operated for a short time to warm the inner pot 3. At this time, the fan motor 23 is operating at the same time, but the lid heating coil 13 and the water supply means 16 are not operating, and the inner pot temperature is low.

  Before the transition to the water absorption process after a predetermined time has elapsed, the operation of the inner pot heating coil 5 and the fan motor 23 is stopped and the process proceeds to the water absorption process. When the process proceeds to the water absorption step, the liquid rolling pump which is the water supply means 16 operates at the initial stage to supply the water in the water storage container 15 to the lid heating plate 14. When a predetermined amount of water is supplied, the water supply means 16 stops. In the first embodiment, since the liquid rolling pump is a metering pump, the water supply means 16 is stopped after a predetermined time has elapsed, but the structure is stopped after all the water in the water storage container 15 is supplied, It may be configured to stop when the supply amount to the lid heating plate 14 reaches a predetermined level.

  After the water supply means 16 stops, a current flows through the inner pot heating coil 5 and the inner pot 3 is heated. At this time, the current to the inner pot heating coil 5 is controlled so that the inner pot temperature is maintained at about 50 ° C. After the inner pot 3 maintained at about 50 ° C. is maintained for a predetermined time, the water absorption step is completed.

  After the water absorption process, the inner pot 3 is heated while the inner pot heating coil 5 is always on, and the inner pot 3 is heated with high thermal power. As a result, the inner pot temperature rises to 100 ° C. at once. The temperature in the inner pot changes at around 100 ° C. until the water in the inner pot 3 runs out, and when the water runs out, the temperature in the inner pot rises to a temperature (about 130 ° C.). At this time, a current is passed through the lid heating coil 13 to heat the lid heating plate 14. Thus, the cooking process ends when the inner pot temperature rises to the cooked temperature.

  When the cooking process is completed, the process proceeds to the steaming process in step S4. In the steaming process, since the lid heating plate 14 is heated by the lid heating coil 13, the water in the steam generating portion 14a boils to generate high-temperature steam and is emitted into the inner pot 3 from the steam inlet 14b. Then, the heat energy necessary to advance gelatinization (α-izing) of the rice starch is supplied to the rice in the inner pot by heat and steam heat from the inner pot heating coil 5, and gelatinization (α-izing) is performed. Promote. At this time, since the steam generation part 14a receives the heat of the inner pot 3 and the lid heating plate 14 and the heat radiation from the heated rice in the cooking process, the water of the steam generation part 14a is preheated. It has become. Therefore, high-temperature steam can be formed in a short time. The steaming process ends when a predetermined time (for example, 13 minutes) elapses, and the rice cooking operation is completed when the steaming process ends.

  In addition, in the rice cooker of Embodiment 1, although demonstrated with the example using the liquid rolling pump as the water supply means 16, this invention is not limited to such a structure, For example, other water supply means, for example, An open / close valve may be provided in an air pump or a water supply hole of the water storage container, and the opening / closing of the open / close valve may be controlled by a solenoid valve or an electric motor. That is, any configuration that can control the supply of water from the water storage container 15 to the steam generation unit 14a may be used. Moreover, in the rice cooker of Embodiment 1, the inner pot heating coil 5 and the lid heating coil 13 are configured so that no voltage is applied simultaneously, and the formed power source voltage is used efficiently. Yes.

FIG. 7 is a block diagram illustrating a configuration of a power supply circuit for main components in the rice cooking operation of the rice cooker according to the first embodiment.
As shown in FIG. 7, the rice cooker of the first embodiment includes a lid heating energization control unit 35 that controls energization of the lid heating coil 13, and an inner pot heating energization control that controls energization of the inner pot heating coil 5. The fan motor 23 for cooling the heat sink to which the unit 36, the lid heating energization control unit 35 and the inner pot heating energization control unit 36 are attached is provided. These energization control units 35 and 36 and the fan motor are provided. 23 is driven and controlled by a drive signal from the drive unit 34. In the inverter power supply circuit 30 to which current is supplied from the commercial power source, full-wave rectified and smoothed direct current is energized and controlled by the energization control units 35 and 36, and the inner pot heating coil 5 and the lid heating coil 13 are applied. Entered. The drive unit 34 includes a lid heating drive circuit 70 that outputs a drive signal to the lid heating energization control unit 35, and an inner pot heating drive circuit 71 that outputs a drive signal to the inner pot heating energization control unit 36. And a drive circuit for components driven by a 20 V power source such as a fan motor drive circuit 72 that outputs a drive signal to the fan motor 23.

  In the power circuit of the rice cooker according to the first embodiment, half-wave rectification is performed on the power source from the commercial power source (AC 100V), and the power source forming circuit 31 generates the necessary power source voltage in the components of the rice cooker. . In the rice cooker of the first embodiment, a 20V power supply (first set power supply) for inputting to the gate terminal which is the control terminal of the IGBT used in the energization control section 35 for lid heating and the energization control section 36 for inner pot heating. ) And a 12V power supply (second set power supply) for operating the liquid rolling pump of the water supply means 16, and an 8V power supply (third set power supply) that is a standby power supply voltage. Yes. In addition, a standby state is the state which is not performing rice cooking operation | movement and heat retention operation | movement in the state which can operate a rice cooker.

When a 12V power supply is used as the standby power supply voltage, the power supply forming circuit 31 may be configured to generate two types (20V / 12V) of power supply voltages.
As shown in FIG. 7, the power generation circuit 31 includes a drive unit that forms a trigger signal for the lid heating energization control unit 35 and the inner pot heating energization control unit 36 and a drive signal for driving the fan motor 23. Supply 20V power to 34.

  The power supply forming circuit 31 is configured to supply power to the fixed power supply output circuit 32. The fixed power output circuit 32 forms a power source such as a microcomputer 22 and a driving power source for the LCD and LED in the display unit 7 and a control power source for the switching element in the operation unit 8. In the first embodiment, the fixed power output circuit 32 forms a 5V power source. In the first embodiment, the voltage of the third set power supply is 8 V. However, this voltage value has a sufficient margin with respect to 5 V that is the output voltage of the fixed power output circuit 32, and the fixed power output circuit 32 is a value at which a sufficient current flows. For this reason, there is no possibility of malfunction occurring in the display unit 7, the operation unit 8, and the microcomputer 22 to which power is supplied from the fixed power output circuit 32. Further, even when the power supply forming circuit 31 supplies the second setting power supply (12V power supply) or the third setting power supply (8V power supply) to the driving unit 34, each transistor used in the driving unit 34, etc. The elements are selected so that the elements normally maintain the on / off state, and the lid heating energization control unit 35, the inner pot heating energization control unit 36, and the fan motor 23 do not malfunction.

  In the rice cooking operation of the rice cooker according to the first embodiment, a 20V power supply (first setting power supply) is required for the lid heating energization control unit 35, the inner pot heating energization control unit 36, and the fan motor 23 to operate. In order for the water supply means 16 to operate, a 12V power supply (second set power supply) is required, and in the standby state, the standby state setting circuit 33 requires an 8V power supply (third set power supply). These three set power sources are formed and supplied in the power source forming circuit 31, but as described above, in the rice cooker sequence of the rice cooker of the first embodiment, it is not necessary to output them redundantly, so any one of them in the power source forming circuit 31. It is configured to switch and output one set power source.

Hereinafter, the structure of the power supply circuit in the rice cooker of Embodiment 1 is demonstrated concretely. FIG. 8 is a circuit diagram showing a configuration of a power supply circuit in the rice cooker of the first embodiment.
In the inverter power supply circuit 30 to which power is supplied from the commercial power supply 40, full-wave rectification is performed by the diode bridge 41 and smoothed by the capacitor 42. A rice cooker in which a resonance capacitor 43 is provided in parallel with the inner pot heating coil 5 and a high-frequency current is set by a switching operation of an IGBT (Insulated Gate Bipolar Transistor) 44 provided in the energizing controller 36 for inner pot heating. It is supplied to the inner pot heating coil 5 according to the sequence. That is, the IGBT 44 controls the current flowing through the inner heating coil 5, and a reflux diode is connected in parallel with the IGBT 44. Similarly, the lid heating coil 13 is also provided with a resonance capacitor 45 in parallel, and is supplied in accordance with a rice cooking sequence in which a high-frequency current is set by a switching operation such as an IGBT of the lid heating energization control unit 35. It is. In the rice cooker of Embodiment 1, it is comprised so that supply electric power may be controlled by a switching frequency, and the heating control with respect to the inner pot 3 is performed by controlling the electric current amount to the inner pot heating coil 5 and the lid heating coil 13. ing.

In FIG. 8, the power supply circuit for the lid heating coil 13 is substantially the same as the power supply circuit for the inner pot heating coil 5, and is therefore omitted. Further, the configuration of the fan motor drive circuit 72 for the fan motor 23 is an energization control circuit and drive circuit for a general fan motor (20 V power supply) used for element cooling. Omitted.
In the following description of the power supply circuit, the power supply circuit of the inner pot heating coil 5 will be described in detail.

  The inner pot heating drive circuit 71 receives a control signal from the control unit 25 of the microcomputer 22 and outputs a drive signal to a gate terminal which is a trigger terminal of the IGBT 44 which is an energization control element of the inner pot heating energization control unit 36. To do. The IGBT 44 excited by the drive signal causes a high-frequency current to flow through the inner pot heating coil 5 to inductively heat the inner pot 3. Data of various rice cooking sequences is stored in the storage unit 24 of the microcomputer 22, and a control signal is output from the control unit 25 according to the rice cooking sequence selected by the user. Further, the microcomputer 22 is provided with a time measuring unit 26 that measures the elapsed time from the reserved rice cooking state and forms time data in the rice cooking operation.

  The power supply forming circuit 31 supplies a 20 V power source to a drive unit 34 for driving and controlling the inner pot heating coil 5, the lid heating coil 13 and the fan motor 23, and a liquid rolling pump which is a water supply means 16. A 12V power supply is supplied, and an 8V power supply is supplied to the standby state setting circuit 33 in the standby state and the reserved rice cooking state where the rice cooker does not perform the rice cooking operation or the heat retaining operation.

  As shown in FIG. 8, the power supply forming circuit 31 charges the electrolytic capacitor 48 by half-wave rectifying the current input from the commercial power supply 40 with a diode 46 and a resistor 47. The power supply hybrid IC 49 provided in the power supply forming circuit 31 is a circuit in which switching elements and various components are provided in one package, and is smoothed by the electrolytic capacitor 52 by switching the voltage charged in the electrolytic capacitor 48. The power supply voltage is stepped down to a desired value. In FIG. 8, the output of the power supply forming circuit 31 is indicated by “A”.

  In the rice cooker according to the first embodiment, the power supply forming circuit 31 includes a power supply voltage for driving and controlling the water supply means 16, a power supply voltage for driving and controlling the heating coils 5 and 13, and a power supply voltage in a standby state. At the time of switching, each set voltage is output after a predetermined time has elapsed since the switching command signal was input from the microcomputer 22. Thus, the power supply forming circuit 31 is configured to switch the output between the power supply voltage for driving and controlling the water supply means 16 and the power supply voltage for driving and controlling the heating coil 13 after a predetermined time has elapsed. Therefore, the rice cooker of Embodiment 1 does not malfunction when switching from the driving state of the water supply means 16 to the operating state of the heating coil 13, and each element can be reliably started.

As an example of a specific operation, for example, when the supply voltage is switched to 20 V in order to operate the inner heating coil 5 from the water supply unit 16 operating at 12 V, the water supply unit 16 is first turned off, The operation when the inner heating coil 5 is turned on is as follows.
(1) The first transistor 58 of the voltage switching circuit 55 is turned off from the microcomputer 22.
(2) The electrolytic capacitor 52 is charged so that the voltage at the output A of the power supply forming circuit 31 becomes the voltage 20V of the Zener diode 53. This charge time is at least about 20 ms.
(3) Therefore, when the inner heating coil 5 is turned on after the water supply means 16 is turned off, the predetermined switching time is about 40 ms in consideration of the charge time and variation.

Further, for example, when the supply voltage is switched to 12 V in order to operate the water supply means 16 from the inner pot heating coil 5 operating at 20 V, the inner pot heating coil 5 is first turned off and then the water supply means 16 is turned on. The operation for setting the state is as follows.
(1) The first transistor 58 is turned on from the microcomputer 22.
(2) The voltage of the output A of the power supply forming circuit 31 is discharged from the electrolytic capacitor 52 to 12V. This discharge time is at least about 180 ms.
(3) Therefore, when the inner pot heating coil 5 operating at 20V is turned off and then switched to the supply voltage 12V in order to turn on the water supply means 16, the predetermined time for the switching takes into account the discharge time and variations. Then, it is about 360 ms.
In addition, in the rice cooker of Embodiment 1 which concerns on this invention, the inner pot heating coil 5 and the lid | cover heating coil 13 do not operate | move simultaneously, but it is comprised so that any one may operate | move.

In the rice cooker of Embodiment 1 which concerns on this invention, it has the voltage detection circuit 37 (refer FIG.7 and FIG.8), and this voltage detection circuit 37 has the water supply means 16 formed in the power supply formation circuit 31. FIG. The power supply voltage for drive control, the power supply voltage for drive control of the heating coils 5 and 13, and the power supply voltage in the standby state are detected.
In the rice cooker of the first embodiment, in order to detect the voltage of the output A of the power supply forming circuit 31, the partial pressure (5 V or less) of the output A is input to the AD port of the microcomputer 22, Based on the divided voltage, the voltage of the output A of the power supply forming circuit 31 is detected. Therefore, although the rice cooker of Embodiment 1 is described as a configuration different from the microcomputer 22 in FIGS. 7 and 8, a voltage detection circuit 37 is provided in the microcomputer 22. In the rice cooker according to the first embodiment, when the supply voltage is switched, if the microcomputer 22 determines that the predetermined voltage is not reached, the liquid crystal display device (LCD) displays an abnormality and displays an alarm. It is configured to sound a buzzer as a means.

  When the voltage of the output A of the power supply forming circuit 31 is higher than the sum of the Zener voltage of the Zener diode 53 and the forward voltage of the built-in light emitting diode of the photocoupler 54, the built-in light emitting diode of the photocoupler 54 emits light. When the built-in light emitting diode of the photocoupler 54 emits light, the phototransistor provided in the package of the power hybrid IC 49 is turned on, and the switching operation in the power hybrid IC 49 is stopped. As a result, the current supply to the coil 50 is stopped and the electric charge of the electrolytic capacitor 52 is consumed, so that the output voltage of the power supply forming circuit 31 decreases.

  On the other hand, when the voltage at the output A of the power supply forming circuit 31 is lower than the sum of the Zener voltage of the Zener diode 53 and the built-in light emitting diode forward voltage of the photocoupler 54, the built-in light emitting diode of the photocoupler 54 does not emit light. If the built-in light emitting diode of the photocoupler 54 does not emit light, the phototransistor provided in the package of the power supply hybrid IC 49 is not turned on, and the switching operation in the power supply hybrid IC 49 is continued. For this reason, due to the resonance between the coil 50 and the freewheeling diode 51, the electrolytic capacitor 52 is charged, and the output voltage of the power supply forming circuit 31 rises.

  In the rice cooker of Embodiment 1, the 1st setting power supply (20V power supply) is formed as mentioned above. In this way, the Zener diode 53 is set so that the output A of the power supply forming circuit 31 is 20V. The first set power is supplied as power for the lid heating drive circuit 70, the inner pot heating drive circuit 71, the fan motor drive circuit 72, etc. of the drive unit 34, and the lid heating energization control section 35, the inner pot heating Drive signals for the energization control unit 36, the fan motor 23, and the like are formed.

  In the power supply formation circuit 31 in the rice cooker of Embodiment 1, when the 1st setting power supply (20V power supply) is not used, the 2nd setting power supply (12V power supply) or the 3rd setting power supply (8V power supply) is used. It is configured to output. For this reason, the power supply forming circuit 31 is provided with a voltage switching circuit 55 for switching its output voltage. The voltage switching circuit 55 is controlled by a command signal from the control unit 25 of the microcomputer 22.

  The voltage switching circuit 55 is a circuit for forming a second setting power supply (12 V power supply). A series circuit of a first resistor 56, a first Zener diode 57 and a first transistor 58 is in parallel with the Zener diode 53. It is connected to the. The gate terminal of the first transistor 58 is connected to receive a command signal from the control unit 25 of the microcomputer 22.

  The voltage switching circuit 55 includes a series circuit of a second resistor 59, a second Zener diode 60, and a second transistor 61 as a circuit for forming a third setting power supply (8V power supply). 2 is connected in parallel with a circuit for forming a set power source. The gate terminal of the second transistor 61 is connected to receive a command signal from the control unit 25 of the microcomputer 22.

  In the rice cooker of Embodiment 1, since the power supply formation circuit 31 has the voltage switching circuit 55, it becomes a 3rd setting power supply (8V power supply) in a standby state, and a 1st setting power supply ( 20V power supply) or a second setting power supply (12V power supply).

  When the power supply forming circuit 31 outputs the second set power supply (12V power supply), for example, when the water supply means 16 is driven in the water absorption process of the rice cooking operation, the command signal from the control unit 25 is sent to the first transistor 58. The first transistor 58 input to the gate terminal is turned on. At this time, the Zener diode 53 and the first Zener diode 57 are set so that the output A of the power supply forming circuit 31 is 12V.

  On the other hand, when the power supply forming circuit 31 outputs the third set power supply (8V power supply), for example, in a standby state, the command signal from the control unit 25 is input to the gate terminal of the second transistor 61 and the second transistor 61 is turned on. At this time, the Zener diode 53 and the second Zener diode 60 are set so that the output A of the power supply forming circuit 31 is 8V.

  The output of the power supply forming circuit 31 is input to the fixed power supply output circuit 32. In the fixed power output circuit 32, a transistor 62, resistors 63 and 64, and a Zener diode 65 constitute a step-down low voltage forming circuit. For example, the voltage 20V input from the power supply forming circuit 31 is stepped down to a voltage 5V. Then, the electrolytic capacitor 66 is charged. In FIG. 8, the output of the fixed power output circuit 32 is indicated by “B”, and the LED (LED indicating the reservation state, LED indicating the cooking state), the liquid crystal display device (LCD), and the alarm means on the display unit 7. It is used as a power source for a certain buzzer and the like, and as a control power source for each switch (reservation switch, “hour” setting switch, “minute” setting switch, rice cooking switch, etc.) in the operation unit 8. In the rice cooker of the first embodiment, each of the switches (reservation switch, “hour” setting switch, “minute” setting switch, rice cooking switch, etc.) is the rice cooking reservation setting means. In the rice cooker of the first embodiment, the rice cooking reservation state (period from the rice cooking reservation setting to the start of the rice cooking operation) is a standby state, and the standby state setting circuit is operated.

  In the rice cooker of Embodiment 1, although the structure which forms 20V power supply, 12V power supply, and 8V power supply in the power supply formation circuit 31 was demonstrated, this invention is not limited to such a structure, A plurality of various voltages Is configured to output any one power supply voltage according to the rice cooking sequence.

  As described above with reference to the rice cooker of the first embodiment, in the rice cooker of the present invention, one power supply is provided without providing an unnecessary power supply circuit in order to operate the component parts according to the operation state. Since a desired power supply voltage can be formed by appropriately switching in the circuit, the rice cooker is small and can greatly reduce the manufacturing cost.

  Since the rice cooker of this invention is the structure which switches the output of a power supply circuit appropriately according to a rice cooking sequence for the components from which a power supply voltage differs, the efficiency of a power supply circuit is attained and it becomes a rice cooker with high versatility.

It is a longitudinal cross-sectional view which shows schematic structure of the rice cooker of Embodiment 1 which concerns on this invention. It is a structural diagram which removes a part in the lid | cover of the rice cooker of Embodiment 1, and shows the inside of the said lid | cover. It is a flowchart explaining the rice cooking operation | movement in the rice cooker of Embodiment 1. FIG. It is a flowchart explaining the water absorption process of the rice cooking operation | movement in the rice cooker of Embodiment 1. FIG. It is a flowchart explaining another water absorption process of the rice cooking operation | movement in the rice cooker of Embodiment 1. FIG. It is a graph which shows transition of the operating condition of the heating coil and the water supply means in the rice cooking operation | movement of the rice cooker of Embodiment 1, and an inner pot temperature. It is a block diagram which shows the structure of the power supply circuit for the components in the rice cooking operation | movement of the rice cooker of Embodiment 1. FIG. It is a circuit diagram which shows the structure of the power supply circuit in the rice cooker of Embodiment 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rice cooker main body 2 Cover 3 Inner pot 4 Inner pot storage part 5 Inner pot heating coil 6 Inner pot temperature sensor 7 Display part 8 Operation part 9 Hook button 10 Engagement part 11 Upper surface cover 12 Lower surface cover 13 Cover heating coil 14 Cover heating Plate 15 Water storage container 16 Water supply means 17 Inner hook seal packing 18 Outer packing 19 Inner packing 20 Steam tower 21 Steam port 22 Microcomputer 23 Fan motor 24 Storage section 25 Control section 26 Timing section 30 Inverter power supply circuit 31 Power supply forming circuit 32 Fixed Power supply output circuit 33 Standby state setting circuit 34 Drive unit 35 Energizing controller for lid heating 36 Energizing controller for heating the inner pot 37 Voltage detection circuit 70 Driving circuit for lid heating 71 Driving circuit for inner pot heating 72 Driving circuit for fan motor

Claims (14)

An inner pot that is detachably stored in the rice cooker body,
Steam generating means for evaporating water and emitting it into the inner pot;
A water storage container for storing water to be supplied to the steam generating means;
Water supply means for supplying water from the water storage container to the steam generating means;
A heating coil for inductively heating the inner pot;
An energization control unit for controlling a current flowing in the heating coil;
A drive unit for driving the energization control unit;
It is possible to form at least two different power supply voltages, ie, a power supply voltage for driving and controlling the water supply means and a power supply voltage for driving and controlling the heating coil, and one power supply voltage according to the rice cooking sequence. A power source forming circuit that forms and outputs only, a control unit that drives and controls the drive unit, the steam generating unit, the water supply unit, and the power source forming circuit according to a rice cooking sequence;
Rice cooker.   The power supply forming circuit has a voltage switching circuit configured by connecting at least two series circuits of a Zener diode and a switching element in parallel, and at least two types output from the voltage switching circuit by each Zener voltage of the Zener diode The rice cooker of Claim 1 comprised so that different power supply voltages might be set.   The power source forming circuit forms a power source voltage for driving and controlling the water supply means, and a power source voltage for a standby state lower than any of the power source voltages for driving and controlling the heating coil. The rice cooker of Claim 1 or 2 comprised so that the power supply voltage of a standby state might be output sometimes.   The rice cooker of Claim 3 comprised so that the said power supply formation circuit might output the power supply voltage of a standby state in the rice cooking reservation state from a rice cooking reservation setting to the start of rice cooking.   4. The apparatus according to claim 1, further comprising a fixed power supply output circuit configured to input a power generation circuit output to form a predetermined voltage, wherein the output of the fixed power supply output circuit is used as a power supply for the control means. Rice cooker according to item.   The steam generating means has a heating plate having a steam generating portion for storing water from the water supply means, a steam inlet for emitting steam into the inner pot, and a heating coil for induction heating the heating plate. The rice cooker as described in any one of thru | or 5.   Steam generating means is provided in a lid rotatably attached to the rice cooker body, and a heating plate having a steam generating portion and a steam inlet is disposed on the inner surface of the lid facing the inner pot, The rice cooker of Claim 6 by which the heating coil was arrange | positioned in the vicinity of the steam generation part.   A water supply means is provided in a lid provided rotatably on the rice cooker body, and water from a water storage container detachably provided on the lid is supplied to the steam generating part of the heating plate in accordance with a command from the control means. The rice cooker according to claim 6 configured to supply water.   The rice cooker according to claim 6, wherein the water supply means is configured by providing a liquid rolling pump between flow paths from the water storage container to the steam generation unit.   The rice cooker according to claim 6, wherein the water supply means is provided with an opening / closing valve in a water supply hole of the water storage container, and the opening / closing of the opening / closing valve is opened / closed by a solenoid valve.   The energization control unit is configured to include an IGBT for controlling the heating coil, and when the heating coil is not operating in the rice cooking sequence, an off signal is input from the drive unit to the gate terminal of the IGBT, and the current to the heating coil The rice cooker as described in any one of Claims 1 thru | or 10 comprised so that might be interrupted | blocked.   The power supply forming circuit is configured to switch the output between a power supply voltage for driving and controlling the water supply means and a power supply voltage for driving and controlling the heating coil after a predetermined time has elapsed from the input of the switching command signal. The rice cooker as described in any one of 1 thru | or 10.   A voltage detection circuit, wherein the voltage detection circuit is configured to detect a power supply voltage for driving and controlling the water supply means formed in the power generation circuit and a power supply voltage for driving and controlling the heating coil. The rice cooker as described in any one of Claims 1 thru | or 10.   The power generation circuit includes a first set power supply voltage for driving and controlling the water supply means, a second set power supply voltage for driving and controlling the heating coil, and the water supply means and the heating coil are operating. 11. The device according to claim 1, wherein the first set power supply voltage is set to be the highest and the third set power supply voltage is set to the lowest. A rice cooker according to claim 1.

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