JP2005261705A - Rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rice cooker performing induction heating by a heating coil, which makes it possible to restrain a rise in temperature of a rice cooker body and articles placed outside of the rice cooker body by decreasing a level of leakage magnetic field near the rice cooker by inhibiting power supply to the rice cooker when it is judged that a position of a loop wire is out of place. <P>SOLUTION: A pot 2 is removably stored in the rice cooker body and heated by a pot heating part 4. A container 6 for generating steam is heated by induction heating using the heating coil 7. A control means 15 controls amount of electric power supplied by the electric power supplying means 16 for supplying the power to the heating coil 7. At least one conductive loop wire 10 is arranged outside of the heating coil 7 so that an out-of-position detecting means 18 detects whether the loop wire 10 is out of place. When the out-of-position detecting means 18 detects the loop wire 10 to be out of place, the control means 15 controls the electric power supplying means 16 so as to restrain amount of the electric power supplied to the heating coil 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rice cooker having a function of induction heating by a heating coil.

  Conventionally, this type of rice cooker reduces the magnetic field (magnetic flux) leaking to the outside of the rice cooker, and the temperature of the rice cooker body or the member outside the rice cooker body rises due to the magnetic flux leaking to the outside of the heating coil. This is configured as shown in FIG. Hereinafter, the configuration will be described.

As shown in FIG. 9, the rice cooker body 31 has a substantially cylindrical shape with an open top surface and is covered with a lid 32 so as to be opened and closed. A pot 33 is detachably stored in the rice cooker body 31. The pan 33 is made of a magnetic material such as stainless steel or iron. The protective frame 34 is a storage portion for the pan 33 and is formed in a bottomed cylindrical shape from a non-metallic material. A heating coil 35 for inductively heating the pan 33 is disposed outside the protective frame 34. The heating coil 35 is composed of an inner coil 36 disposed outside the bottom surface of the protective frame 34 and an outer coil 37 disposed on the outer periphery thereof. Further, a ferrite 38 is disposed outside the heating coil 35. The control board 40 supplies high frequency power to the heating coil 35, and has a magnetic shielding plate 41 made of a conductive material (for example, made of aluminum) provided on the outer peripheral side of the heating coil 35 (for example, a patent). Reference 1).
Japanese Examined Patent Publication No. 4-36009

  However, in such a conventional configuration, since the magnetic shield plate 41 made of wide and cylindrical aluminum is built in, there is a problem that the size of the rice cooker body 31 with respect to the pan 33 is large, and the carrying and installation properties are poor. .

  Further, the magnetic shield 41 may not be arranged depending on the arrangement of the control board 10 and the size of the rice cooker body 31. Furthermore, it was necessary to change the shape of the magnetic shield 41 depending on the type and capacity of the rice cooker, and the magnetic shield 41 could not be shared.

  However, this first problem is solved by disposing at least one conductive loop wire outside the heating coil 35 in place of the magnetic shield plate 41. That is, since a current that generates a magnetic field that cancels the loop line and the magnetic field in the vicinity of the loop line flows in the loop line, the magnetic field (magnetic flux) leaking to the outside of the rice cooker body can be effectively reduced. The rice cooker body has almost the same degree of freedom as the shape of the rice cooker body, and is almost the same as the aluminum magnetic shield 41 of the conventional example, and is outside the rice cooker body or the rice cooker body. Since the temperature rise of the object can be suppressed and a small and inexpensive rice cooker can be realized, a rice cooker that is easy to carry and easy to install can be realized.

  However, in the case of the above configuration, a second problem newly arises. If the rice cooker is accidentally dropped while it is being transported or carried from the kitchen to the table, the position of the loop line may shift due to some impact applied to the rice cooker. If the operation is continued in such a state, the magnetic shielding effect is lost, the level of the leakage magnetic field to the vicinity of the rice cooker becomes high, and the temperature rise of the rice cooker body or the object outside the rice cooker body can be suppressed. Had the problem of disappearing.

  The present invention solves the above-described conventional problems, and suppresses the power supply to the rice cooker when it is determined that the position of the loop line has shifted, thereby reducing the leakage magnetic field level in the vicinity of the rice cooker, An object of the present invention is to provide a safe and reliable rice cooker that suppresses the temperature rise of an object outside the main body or the rice cooker body.

  In order to achieve the above object, the present invention detachably stores a pan in a rice cooker body, heats the pan with a pan heating unit, and provides a container for generating steam in the rice cooker body. Inductive heating is performed by the heating coil, and the amount of power supplied by the power supply means for supplying power to the heating coil is controlled by the control means, and at least one conductive loop wire is disposed outside the heating coil. The misalignment detection unit detects that the position of the wire is misaligned, and the control means detects the misregistration of the loop wire when the misalignment detection unit detects the misalignment of the loop wire. The supply means is configured to be controlled.

  Thereby, when abnormality, such as a position shift of a loop line, has occurred, by suppressing the power supply to the heating coil, the leakage magnetic field to the vicinity of the rice cooker can be kept below a certain level, The temperature rise of the object outside the rice cooker body can be suppressed, and a safe and highly reliable rice cooker can be provided.

  The rice cooker of this invention can make the leakage magnetic field to the rice cooker vicinity below a certain fixed value, and can suppress the temperature rise of the object in the exterior of a rice cooker main body or a rice cooker main body.

  1st invention is a rice cooker main body, the pan detachably accommodated in this rice cooker main body, the pan heating part which heats this pan, the container which produces | generates in the said rice cooker main body, and produces | generates steam, A heating coil for inductively heating the container; power supply means for supplying power to the heating coil; control means for controlling the amount of power supplied to the power supply means; and at least one disposed outside the heating coil. A conductive loop line, and a position shift detection unit that detects that the position of the loop line has shifted. When the position shift detection unit detects a position shift of the loop line, the heating coil The power supply unit is configured to control the amount of power supplied to the heater, and the amount of power supplied to the heating coil is suppressed when an abnormality such as a positional deviation of the loop line occurs. In the vicinity of the rice cooker The can below a certain a certain leakage magnetic field, the temperature rise of an object external to the cooker body or rice cooker body can be suppressed, it is possible to provide a safe and reliable cooker.

  In a second aspect based on the first aspect, the control means controls the power supply means so as to stop the power supply to the heating coil when the position deviation detection unit detects that the position of the loop line is displaced. When there is an abnormality such as a loop line being misaligned, the power supply to the heating coil can be stopped to eliminate the leakage magnetic field in the vicinity of the rice cooker. Or the temperature rise of the object in the exterior of a rice cooker main body can be suppressed, and also a safe and reliable rice cooker can be provided.

  According to a third invention, in the first or second invention, the misregistration detection unit includes a coil current detection unit that detects a current flowing through the heating coil, and the coil current is in a range of normal condition values set in advance. When it is outside, it is determined that the position of the loop line is misaligned. The position deviation of the loop line can be accurately determined, and if an abnormality such as a misalignment of the loop occurs, the heating coil Can suppress or stop the power supply to the can, eliminate the leakage magnetic field to the vicinity of the rice cooker, can suppress the temperature rise of the rice cooker body or the object outside the rice cooker body, more A highly safe rice cooker can be provided.

  In a fourth aspect based on the first or second aspect, the misregistration detection unit has frequency detection means for detecting the frequency of the power supply means, and the frequency is outside the range of the normal condition value set in advance. The position of the loop wire is judged as being misaligned, and the position of the loop wire can be judged with high precision. The power supply to can be suppressed or stopped, the leakage magnetic field to the vicinity of the rice cooker can be eliminated, the temperature rise of the rice cooker body or the object outside the rice cooker body can be suppressed, and it is safer A highly reliable rice cooker can be provided.

  According to a fifth invention, in any one of the first to fourth inventions, the control means determines that the position deviation detection unit has shifted the position of the loop line, and suppresses or stops power supply to the heating coil. In this case, the predetermined power is supplied again after a certain period of time, and if the coil current is within the normal condition value range, the power supply means is instructed to continue the power supply as it is. Even if the coil current is erroneously detected due to noise, etc., and the rice cooking is stopped, the rice cooking can be resumed, so even though no abnormality has occurred, the rice cooking has stopped or its output has been suppressed Can be prevented, and reliable operation can be performed.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, when the position deviation detecting unit determines that the position of the loop line is deviated, the informing means for performing a notification operation is provided. If a loop line misregistration error occurs, the user can be notified immediately that an error has occurred, so the user can continue cooking without being aware of the error. Malfunctions and waste of energy can be prevented.

  According to a seventh invention, in any one of the first to fifth inventions, a display means for performing a display operation is provided, and when the position deviation detection unit determines that the position of the loop line has shifted, a message to that effect is displayed. If a loop line misregistration error occurs, the user can be notified immediately that an error has occurred, so the user can continue cooking without being aware of the error. Malfunctions and waste of energy can be prevented.

  According to an eighth invention, in any one of the first to seventh inventions, whether the power supply to the heating coil is stopped or suppressed when the position shift detection unit determines that the position of the loop line has shifted. Is provided with selection input means set by the user, cooks rice by heating only the pot, and if it is not necessary to release steam to the pot by heating the container, select to stop and heat the pot When the container is heated, steam is discharged into the pan, and if it is judged that more plump rice is needed, it can be selected for suppression.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a block diagram of a rice cooker in Embodiment 1 of the present invention. FIG. 2 shows a cross-sectional view of the rice cooker according to Embodiment 1 of the present invention.

  As shown in FIG. 2, the rice cooker main body 1 detachably stores a pan 2 and heats the pan 2 by a pan heating unit 4. The lid 3 covers the upper surface of the pan 2 so as to be freely opened and closed, and a steam outlet 5 is provided inside the lid 3.

  The steam generation unit 8 detachably houses a container 6 that generates steam, and is formed in a bottomed cylindrical shape using a non-metallic material such as a resin. The container 6 is made of a magnetic material such as stainless steel or iron. A heating coil 7 for inductively heating the container 6 is disposed outside the steam generation unit 8, and the heating coil 7 generates an alternating magnetic field by a high-frequency current supplied from a high-frequency power source. Induction heating.

  The I-shaped ferrite 9 is a ferrite member formed of a highly permeable magnetic material, and is near the outside of the heating coil 7 so that the winding direction is substantially orthogonal to the winding direction of the heating coil 7. In addition, two are arranged diagonally. The I-shaped ferrite 9 prevents the magnetic field generated by the heating coil 7 from leaking outside the rice cooker body 1 and promotes induction heating of the container 6.

  The loop wire 10 is arranged in two concentric circles in the vicinity of the outside of the I-shaped ferrite 9 in the closed loop of one turn, and further two wires in the upper and lower sides of the heating coil 7 in the closed loop of one turn. It is arranged concentrically outside the I-shaped ferrite 9 in the direction. Further, the loop wire 10 is a conductive wire, and the copper wire is heat-resistant and covered with clothes having a surface damage prevention, and the temperature of the container 6 exceeds 100 ° C. during the heating of the container 6. Use braided fluorine wire.

  The pan temperature sensor 12 detects the temperature of the pan 2 and is composed of a thermistor and detects the temperature based on its resistance value. The container temperature sensor 11 detects the temperature of the container 6 and is composed of a thermistor and detects the temperature based on its resistance value.

  The control board 13 inputs the output of the container temperature sensor 11, the output of the pan temperature sensor 12, and the input signal from the rice cooking start switch 14 shown in FIG. 3 to heat the pan heating unit 4 and to the heating coil 7. A high-frequency current for generating an alternating magnetic field is supplied. Further, the control board 13 has a high frequency power source, and supplies a high frequency current to the pot heating unit 4 and the heating coil 7 by switching of a semiconductor power element such as an IGBT provided between the high frequency power source and the heating coil 7. The power supply can be controlled by the switching frequency.

  Next, as shown in FIG. 1, the control means 15 is constituted by a microcomputer mounted on the control board 13, instructs the pan heating unit 4 to supply a predetermined amount of power to the pan 2, and further the container 6. The power supply means 16 is instructed to obtain a predetermined power supply amount.

  The power supply means 16 is composed of a high-frequency power source and is connected to the pot heating unit 4. Then, the power supply current from the power supply means 17 for supplying commercial power is detected, and the power supply current is controlled so that the power supplied to the pan 2 becomes the amount of power supplied from the control means 15. ing. Further, the power supply means 16 is connected to the heating coil 7. The power supply current from the power supply means 17 for supplying commercial power is detected, and the power supply current is controlled so that the power supplied to the container 6 becomes the amount of power supplied from the control means 15. ing.

  The misregistration detection unit 18 is configured by a microcomputer mounted on the control board 13 and includes a coil current detection means 19. The coil current detection means 19 converts the current flowing through the heating coil 7 into a voltage using a current transformer. The misalignment detection unit 18 compares the input value from the coil current detection unit 19 with the normal operation condition value stored in advance in the storage area of the microcomputer, and based on the comparison result, the control unit 15. The control means 15 instructs the power supply means 16 about the amount of power supplied.

  FIG. 3 is a diagram showing the display and operation unit of the rice cooker, and the rice cooker start switch 14 is arranged. Moreover, LCD22 which is the display means 21 which can display during cooking rice or whether a coil current is abnormal is arrange | positioned. The notification means 23 is configured by a buzzer and is controlled to ring when the rice cooking start switch 14 is received in the operation unit or when the coil current is determined to be abnormal.

  The operation and action of the above configuration will be described. First, the rice which cooks rice and the water corresponding to the amount of water are put in the pan 2 and are decorated in a predetermined state of the rice cooker body 1. Furthermore, when a predetermined amount of water is put into the container 6 provided in the rice cooker body 1 and the user operates the rice cooking start switch 14, the LCD 22 displays that the rice is being cooked, and the buzzer sounds for a preset time. And cooking rice is started.

  Rice cooking drives the pot heating unit 4 based on the rice cooking sequence preset in the microcomputer mounted on the control board 13 by the pot temperature sensor 12 and the container temperature sensor 11 of the pot 2, and further the container 6 Steam is generated by induction heating, and the steam is ejected from the steam outlet 5 onto the upper surface of the pan 2. The water and rice in the pot 2 are heated from the bottom of the pot 2 by the pot heating unit 4, and further cooked by heating the upper surface with steam released to the pot 2. Can cook plumply.

  When the container 6 is heated, induction heating is performed by an alternating magnetic field generated by supplying a high-frequency current from a high-frequency power source to the heating coil 7, and the current flowing through the heating coil 7 is detected by the coil current detection means 19.

  FIG. 4 is a diagram showing the relationship between the power supply current and the coil current. As shown in FIG. 4, the power supply unit 16 performs control so that the power supply current becomes the target value A. At this time, the target value A of the power supply current is a value instructed from the control means 15. Then, when the operation is stabilized after a certain time has elapsed, the coil current becomes β.

  Next, a case where the loop line 10 is displaced will be described. If one position of the loop line 10 is shifted, the current that generates a magnetic field that cancels the magnetic field in the vicinity of the loop line 10 decreases, so that the inductance of the heating coil 7 increases and the resonance frequency decreases. Further, the power supply means 16 controls the power supply current to be A, and the relationship between the switching frequency of FIG. 5 and the high frequency resistance of the heating coil 7 in order to make the power supply amount to the heating coil 7 constant. Thus, the switching frequency decreases from B to C before the position of the loop line 10 is shifted, and the high frequency resistance increases from A to A.

  Then, since the amount of power supplied to the heating coil 7 is constant and the high-frequency resistance is increased, the coil current is changed from β before the positional deviation of the loop line 10 to α as shown in FIG. It will be. Therefore, the position deviation detection unit 18 sets in advance condition values I and II for determining whether the loop line 10 is in a normal state or a position deviation state, and compares the condition value with the detected coil current value. . At this time, if the detected coil current value is equal to or less than the condition value I or II, it is determined that the state is abnormal.

  FIG. 6 is a diagram showing the relationship between the amount of power supplied to the heating coil 7 and the magnetic flux leaking to the outside of the rice cooker body 1. As shown in FIG. 6, when the loop line 10 is determined to be in a misaligned state, the control unit 15 supplies power to the heating coil 7 in order to reduce the magnetic flux leaking outside the rice cooker body 1 to a reference level γ or less. Then, the power supply amount D is controlled to be suppressed to the power supply amount E.

  As described above, in the present embodiment, the positional deviation detection unit 18 that detects the positional deviation of the loop wire 10 disposed outside the heating coil 7 is provided, and the control unit 15 includes the positional deviation detection unit 18. When the position of the loop line 10 is detected, the power supply means 16 is controlled so as to suppress the amount of power supplied to the heating coil 7, so that an abnormality such as a position shift of the loop line 10 occurs. In addition, by suppressing the amount of power supplied to the heating coil 7, the leakage magnetic field to the vicinity of the rice cooker can be kept below a certain level, and the temperature rise of the rice cooker body 1 or the object outside the rice cooker body 1 can be suppressed. And a safe and reliable rice cooker can be provided.

  The misalignment detection unit 18 includes coil current detection means 19 for detecting the current flowing through the heating coil 7, and the position of the loop line is misaligned when the coil current is outside the preset normal condition value range. Therefore, it is possible to accurately determine the positional deviation of the loop wire 10 and to suppress the power supply to the heating coil when an abnormality such as the positional deviation of the connection of the loop wire 10 occurs. It can be stopped, the leakage magnetic field to the vicinity of the rice cooker can be eliminated, the temperature rise of the rice cooker body 1 or the object outside the rice cooker body 1 can be suppressed, and rice cooking with higher safety Can be provided.

(Embodiment 2)
The control means 15 shown in FIG. 1 is configured to control the power supply means 16 so that the power supply to the heating coil 7 is stopped when the position deviation detection unit 18 detects that the position of the loop wire 10 is displaced. Yes. Other configurations are the same as those of the first embodiment.

  The operation and action of the above configuration will be described. First, the control means 15 performs heating control in the same manner as in the first embodiment. In addition, the abnormality of the coil current is determined in the same manner as in the first embodiment. If it is determined that the coil current is in an abnormal state at that time, the control unit 15 causes the power to stop the power supply to the heating coil 7. Instruction is given to the supply means 16, and the cooking of rice is continued by heating only the pot 2 without heating the container 6.

  In addition, when the two loop lines 10 are displaced, the control means 15 is configured so that the two loop lines are displaced in order to make the magnetic flux leaking outside the rice cooker body 1 below the reference level γ in FIG. The power supply amount is controlled from the power supply amount D to G, but the minimum required power supply amount for the container 6 to generate steam is equal to or greater than the power supply amount F. The control means 15 instructs the power supply means 16 to stop the power supply to the heating coil 7 and controls the container 6 not to be heated.

  As described above, in the present embodiment, when the position deviation detection unit 18 determines that the position deviation of the loop wire 10 is detected, the control means 15 stops the power supply to the heating coil 7. Therefore, when an abnormality occurs such as the position of the loop wire 10 being shifted, the power supply to the heating coil 7 can be stopped, and the leakage magnetic field near the rice cooker is eliminated. The temperature rise of the rice cooker body 1 or an object outside the rice cooker body 1 can be eliminated, and a safe and highly reliable rice cooker can be provided.

(Embodiment 3)
As shown in FIG. 7, the misregistration detection unit 18 is composed of a microcomputer mounted on the control board 13 shown in FIG. 2, and includes a frequency detection means 20. The frequency detection means 20 is an operational amplifier, a logic circuit, or the like. Thus, the switching frequency of the semiconductor power element such as an IGBT provided in the power supply means 16 is converted into a voltage, and when the frequency is outside the range of the preset normal condition value, it is determined that the position of the loop line 10 is misaligned. Like to do. Other configurations are the same as those of the first embodiment, and the same reference numerals are given and description thereof is omitted.

  The operation and action of the above configuration will be described. First, the control means 15 performs heating control in the same manner as in the first embodiment. When the position of the loop line 10 is shifted, the frequency is changed from B to C as shown in FIG.

  Therefore, the positional deviation detection unit 18 sets in advance condition values III and IV for determining whether the state is normal or abnormal, and compares the condition value with the detected frequency value. At that time, if the detected frequency is equal to or less than the condition value III or IV, it is determined that the state is abnormal. Then, the control means 15 instructs the power supply means 16 to suppress or stop the power supply to the heating coil 7 and controls to suppress or stop the heating.

  As described above, in the present embodiment, the misregistration detection unit 18 includes the frequency detection unit 20 that detects the frequency of the power supply unit 16 and the frequency is outside the range of the normal condition value set in advance. Since the position deviation is determined, the position deviation of the loop line 10 can be accurately determined. When an abnormality such as the position deviation of the loop line 10 occurs, power is supplied to the heating coil 7. Can be suppressed or stopped, the leakage magnetic field to the vicinity of the rice cooker can be eliminated, the temperature rise of the rice cooker body 1 or the object outside the rice cooker body 1 can be suppressed, and more safety High-quality rice cookers can be provided.

  In the present embodiment, the switching frequency of a semiconductor power element such as an IGBT provided in the power supply unit 16 is converted into a voltage and input to the control unit 15. However, the current flowing through the heating coil 7 is converted into a voltage by the current transformer. By using a dedicated IC for converting the voltage into a frequency and converting the voltage into a frequency, it may be converted into a frequency and input to the control means 15, and the same effect can be obtained.

(Embodiment 4)
The control means 15 shown in FIG. 1 determines that the positional deviation detection unit 18 determines that the positional deviation of the loop line has occurred, and suppresses or stops the power supply to the heating coil 7. If the coil current is within the range of the normal condition value at that time, the power supply means 16 is instructed to continue the power supply as it is. Other configurations are the same as those of the first embodiment.

  The operation and action of the above configuration will be described. First, the control means 15 performs heating control in the same manner as in the first embodiment. In addition, as in the first embodiment, an abnormality in the coil current is determined. At this time, if it is determined that the state is abnormal, the control unit 15 stops the power supply to the heating coil 7. The power supply means 16 is instructed and controlled to stop heating. Then, after a predetermined time elapses, predetermined power is supplied again to determine the coil current misalignment. At that time, if it is determined to be normal, control is performed so as to continue the power supply.

  As described above, in the present embodiment, the control means 15 is determined when the positional deviation detection unit 18 determines that the positional deviation of the loop wire 10 and the power supply to the heating coil 7 is suppressed or stopped. Since the predetermined power is supplied again after a certain period of time and the coil current is within the range of the normal condition value, the power supply means 16 is instructed to continue the power supply as it is. Even if the position of the loop wire 10 has not occurred, when it is determined that there is an abnormality due to lightning surge or impulse noise entering the device via the power supply means 17, malfunction is prevented by performing the abnormality determination again. And a more reliable rice cooker can be provided.

(Embodiment 5)
The control means 15 shown in FIG. 1 notifies the fact by the notifying means 23 when the position deviation detecting unit 18 determines that the position deviation of the loop line 10 has occurred. Other configurations are the same as those of the first embodiment.

  The operation and action of the above configuration will be described. First, the control means 15 performs heating control in the same manner as in the first embodiment. Further, as in the first embodiment, an abnormality in the coil current is determined. At this time, if it is determined to be in an abnormal state, the control means 15 suppresses power supply to the heating coil 7. The power supply unit 16 is instructed and a signal is output to the buzzer as the notification unit 23 for notification.

  As described above, in the present embodiment, when the detected coil current is outside the set normal condition value range, a notification to that effect is made. When it occurs, it is possible to promptly notify the user that an abnormality has occurred, so that it is possible to prevent failure and waste of energy caused by continuing cooking without the user being aware of the abnormality.

  In this embodiment, a buzzer is used as the notification means 23, but this may be anything as long as it can audibly notify the user that an abnormality has occurred.

(Embodiment 6)
The control means 15 shown in FIG. 1 displays the fact on the LCD 22 which is the display means 21 when the position deviation detection unit determines that the position deviation of the 18 loop line 10 has occurred. Other configurations are the same as those of the first embodiment.

  The operation and action of the above configuration will be described. First, the control means 15 performs heating control in the same manner as in the first embodiment. Further, as in the first embodiment, an abnormality in the coil current is determined. At this time, if it is determined to be in an abnormal state, the control means 15 suppresses power supply to the heating coil 7. The power supply means 16 is instructed, and a signal indicating that it is in an abnormal state is output and displayed on the LCD 22 as the display means 21.

  As described above, in the present embodiment, when the detected coil current is outside the range of the set normal condition value, the fact is displayed, so that the position of the loop line 10 has shifted. In this case, since it is possible to promptly notify the user that an abnormality has occurred, it is possible to prevent a failure or waste of energy caused by continuing cooking without the user being aware of the abnormality.

  In the present embodiment, the LCD 17 is used as the display means 16, but this may be anything as long as it can visually notify the user that an abnormality has occurred.

(Embodiment 7)
As shown in FIG. 8, the selection input unit 24 sets the heating to the container 6 to be stopped or suppressed by the operation of the user when the positional deviation detection unit 18 determines that the positional deviation of the loop line 10 has occurred. Thus, a selection input switch 25, which is a selection input means 24, and a selected course display 26 composed of light-emitting diodes are connected to a microcomputer mounted on the control board 13. Other configurations are the same as those of the first embodiment.

  The operation and action of the above configuration will be described. When the position shift detection unit 18 determines that the position of the loop line 10 is shifted, it is determined that the user does not have to release steam to the pan 2 by heating the container 6 and immediately wants to stop heating the container 6. When the selection input switch 25 selects the stop, the control means 15 stops the power supply to the heating coil 7, stops the heating of the container 6, and heats only the pot 2.

  In addition, when the user determines that it is necessary to release steam to the pan 2 by heating the container 6 during cooking, and selects the suppression by the selection input switch 25, the control means 15 determines the power supply to the heating coil 7 in advance. Restraining to electric power, heating the pot 2 together with the heating of the container 6 to cook rice. In this way, it is possible to select whether to stop or suppress the heating of the container 6.

  As described above, in the present embodiment, when the misalignment detection unit 18 determines that the loop wire 10 is misaligned, the user determines whether to stop or suppress the power supply to the heating coil 7. Since the selection input means 24 for setting is provided, the rice is cooked by heating only the pot 2 and when it is not necessary to release steam to the pot 2 by heating the container 6, it is selected to stop the heating of the pot 2 and the container When steam 6 is released by heating 6 and it is determined that more plump rice is necessary, it can be selected for suppression.

  As described above, the rice cooker according to the present invention makes the leakage magnetic field to the vicinity of the rice cooker below a certain level, can suppress the temperature rise of the rice cooker body or the object outside the rice cooker body, and is safe. Since a highly reliable rice cooker can be provided, it is useful as a rice cooker that performs induction heating with a heating coil.

The block diagram of the rice cooker in the 1st Embodiment of this invention. Cross section of the rice cooker The figure which shows the display and operation part of the rice cooker The figure which shows the relationship between the power supply current and coil current of the rice cooker The figure which shows the relationship between the frequency of the rice cooker and the high frequency resistance of the heating coil The figure which shows the relationship between the electric power supply amount to the heating coil of the rice cooker, and the magnetic flux which leaks to the outer side of the rice cooker main body The block diagram of the rice cooker in the 3rd Embodiment of this invention. The front view of the selection input means of the rice cooker in the 7th Embodiment of this invention Cross section of conventional rice cooker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rice cooker main body 2 Pan 4 Pan heating part 6 Container 7 Heating coil 10 Loop wire 15 Control means 16 Power supply means 18 Misalignment detection part

Claims (8)

A rice cooker body, a pan that is detachably stored in the rice cooker body, a pan heating unit that heats the pan, a container that generates steam in the rice cooker body, and induction heating the container A heating coil; power supply means for supplying power to the heating coil; control means for controlling the amount of power supplied to the power supply means; and at least one conductive loop wire disposed outside the heating coil. And a misregistration detection unit that detects that the position of the loop line is misaligned, and the control unit detects the amount of power supplied to the heating coil when the misregistration detection unit detects the misalignment of the loop line. A rice cooker configured to control the power supply means to suppress. The rice cooker according to claim 1, wherein the control means is configured to control the power supply means so as to stop the power supply to the heating coil when the position deviation detection unit detects that the position of the loop line is displaced. The misalignment detection unit has coil current detection means for detecting the current flowing through the heating coil, and when the coil current is outside the range of the normal condition value set in advance, it is determined that the position of the loop line is misaligned. The rice cooker according to claim 1 or 2. The misregistration detection unit has a frequency detection means for detecting the frequency of the power supply means, and when the frequency is outside the range of a preset normal condition value, it is determined that the loop line is misaligned. Item 1 or 2 rice cooker. When the position deviation detector determines that the position of the loop line has shifted and suppresses or stops the power supply to the heating coil, the control means supplies the predetermined power again after a certain period of time. The rice cooker according to any one of claims 1 to 4, wherein if the coil current is within a range of normal condition values, the power supply means is instructed to continue supplying power as it is. The rice cooker according to any one of claims 1 to 5, further comprising a notification unit that performs a notification operation, wherein when the position shift detection unit determines that the position of the loop line has shifted, a notification to that effect is provided. The rice cooker according to any one of claims 1 to 5, further comprising display means for performing a display operation, wherein when the position shift detection unit determines that the position of the loop line has shifted, a message to that effect is displayed. The selection input means for the user to set whether to stop or suppress the power supply to the heating coil when the position shift detection unit determines that the position of the loop line is shifted. The rice cooker of any one of Claims.

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