WO2014080499A1 - Cuiseur à chauffage par induction - Google Patents

Cuiseur à chauffage par induction Download PDF

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Publication number
WO2014080499A1
WO2014080499A1 PCT/JP2012/080362 JP2012080362W WO2014080499A1 WO 2014080499 A1 WO2014080499 A1 WO 2014080499A1 JP 2012080362 W JP2012080362 W JP 2012080362W WO 2014080499 A1 WO2014080499 A1 WO 2014080499A1
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WIPO (PCT)
Prior art keywords
magnetic flux
conductor
leakage magnetic
induction heating
switch means
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Application number
PCT/JP2012/080362
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English (en)
Japanese (ja)
Inventor
雄一郎 伊藤
吉野　勇人
和善 根岸
健太郎 橋元
智也 蜷川
Original Assignee
三菱電機株式会社
三菱電機ホーム機器株式会社
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Application filed by 三菱電機株式会社, 三菱電機ホーム機器株式会社 filed Critical 三菱電機株式会社
Priority to CN201290001367.XU priority Critical patent/CN204681616U/zh
Priority to PCT/JP2012/080362 priority patent/WO2014080499A1/fr
Priority to TW102106367A priority patent/TWI580308B/zh
Publication of WO2014080499A1 publication Critical patent/WO2014080499A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices

Definitions

  • the present invention relates to an induction heating cooker.
  • a nonmagnetic metal such as plate-like aluminum is used as an electromagnetic shielding material around the heating coil.
  • Such an induction heating cooker generates an induction current in the electromagnetic shielding material by the magnetic flux leaked from the heating coil, and cancels the leakage magnetic flux from the heating coil by the magnetic flux generated by this induction current (for example, Patent Documents). 1).
  • the present invention has been made to solve the above-described problems, and provides an induction heating cooker that can suppress power loss generated in leakage magnetic flux suppression means.
  • An induction heating cooker includes a heating coil that generates a high-frequency magnetic field and induction-heats an object to be heated, a drive unit that supplies a high-frequency current to the heating coil, and leakage magnetic flux suppression means, and the leakage
  • the magnetic flux suppressing means is disposed outside the heating coil as viewed from the object to be heated, and switches between a first conductor having a pair of terminals and a conduction state and an open state between the terminals of the first conductor.
  • the switch means switches between a conductive state and an open state between the terminals of the first conductor according to a heating power by which the heating coil heats the object to be heated, and the switch of the first conductor When the terminals become conductive, the first conductor is electrically short-circuited.
  • the switch means switches between the conductive state and the open state between the pair of terminals of the first conductor according to the heating power with which the heating coil heats the object to be heated. For this reason, when the heating power for heating the object to be heated is equal to or greater than the threshold value, the first conductor is electrically short-circuited by bringing the pair of terminals of the first conductor into a conductive state, so that the outside of the induction heating cooker Leakage magnetic flux leaking to can be suppressed.
  • the heating power for heating the object to be heated is less than the threshold value, by generating an open state between the pair of terminals of the first conductor, the generation of the induced current in the first conductor of the leakage flux suppressing means is suppressed.
  • FIG. 1 It is a schematic block diagram of the induction heating cooking appliance which concerns on Embodiment 1.
  • FIG. 2 is another schematic block diagram of the induction heating cooking appliance which concerns on Embodiment 1.
  • FIG. It is a graph which shows the relationship between the ampere turn of conducting wire, and the leakage magnetic flux which leaks outside the induction heating cooking appliance. It is a figure explaining the leakage magnetic flux suppression means of the induction heating cooking appliance which concerns on Embodiment 2.
  • FIG. FIG. 5 is an equivalent circuit diagram showing each conductor shown in FIG. 4. It is a figure explaining the leakage magnetic flux suppression means of the induction heating cooking appliance which concerns on Embodiment 3.
  • FIG. 1 It is a figure explaining the relationship between the on-off state of the switch means of the induction heating cooking appliance concerning Embodiment 3, and input power. It is a figure explaining the leakage magnetic flux suppression means of the induction heating cooking appliance which concerns on Embodiment 4. FIG. It is a figure explaining the leakage magnetic flux suppression means of the induction heating cooking appliance which concerns on Embodiment 5. FIG.
  • FIG. 1 is a schematic configuration diagram of an induction heating cooker according to Embodiment 1.
  • the induction heating cooker 100 according to the first embodiment is an induction heating type rice cooker, which is a rice cooker 1, a heating coil 2, a drive unit 3, a display operation unit 4, a control unit 5, and a power supply unit. 6, a cord reel case 7, and a leakage magnetic flux suppressing means 8 having a conducting wire 81 and a switch means 82.
  • a housing not shown).
  • a heating coil 2 that induction-heats the rice cooker 1 is disposed on the bottom surface and the outer peripheral side of the lower side surface of the rice cooker 1 that is an object to be heated.
  • the heating coil 2 is supplied with high-frequency power by the drive unit 3 constituting the inverter circuit, and induction-heats the rice cooker 1.
  • the display operation unit 4 includes an operation unit that receives a rice cooking instruction and a rice cooking condition setting from a user, and a display unit that displays an operation state, a message to the user, and the like.
  • the display operation unit 4 outputs a signal based on the setting from the user to the control unit 5, and the control unit 5 including a microcomputer and a control circuit follows a predetermined control sequence based on the signal from the display operation unit 4.
  • the drive unit 3 is driven and controlled.
  • the power supply unit 6 generates a power source for driving the display operation unit 4 and the control unit 5 from a commercial AC power source.
  • a cord reel case 7 for storing a power cord for connection to a commercial AC power source is provided below the heating coil 2.
  • the casing of the cord reel case 7 is made of sheet metal (such as iron).
  • the cord reel case 7 is located on the opposite side of the rice cooker 1 with the heating coil 2 interposed therebetween.
  • the induction heating cooker 100 includes a blower that sends cooling air for cooling the members in the casing of the induction heating cooker 100.
  • This blower is, for example, an axial fan, and is configured to send cooling air to a member whose temperature rises due to operation, such as an electronic component provided in the heating coil 2 and the drive unit 3.
  • the induction heating cooker 100 is made of a conductive material, and is a conductive wire (winding wire) 81 that is wound in a coil shape so as to surround the rice cooker 1 and the heating coil 2, and switch means 82.
  • Leakage magnetic flux suppressing means 8 is provided.
  • the conducting wire 81 corresponds to the first conductor of the present invention.
  • the conducting wire 81 of the leakage magnetic flux suppressing means 8 is disposed outside the heating coil 2 when viewed from the rice cooker 1, that is, at a position away from the heating coil 2 when viewed from the rice cooking pot 1.
  • the conducting wire 81 constituting the leakage magnetic flux suppressing means 8 can be formed by, for example, a copper wire or an aluminum wire, or can be formed by winding a copper plate or an aluminum plate in a coil shape.
  • the switch means 82 is provided between a pair of terminals of the conducting wire 81, and brings the conducting wire 81 constituting the leakage magnetic flux suppressing means 8 into a conductive state or an open state by turning on or off the contact.
  • the switch means 82 is turned on, the pair of terminals of the conductive wire 81 are in a conductive state and are electrically short-circuited to form a closed loop.
  • the switch means 82 is turned off, the pair of terminals of the conducting wire 81 is opened.
  • On / off control of the contacts of the switch means 82 is executed by a control signal from the control unit 5.
  • the conducting wire 81 constituting the leakage magnetic flux suppressing means 8 is assumed to be insulated with a coating or the like, and is not conductive even if the conducting wires 81 adjacent to each other come into contact with each other. In addition, when the insulation treatment is not performed, it is assumed that the conducting wire 81 is arranged with a sufficient distance so as not to contact each other. Although not shown in FIG. 1, a ferrite core may be installed near the lower portion of the heating coil 2.
  • FIG. 2 is another schematic configuration diagram of the induction heating cooker according to the first embodiment.
  • FIG. 1 shows an example in which the conductor 81 is provided as the first conductor of the leakage flux suppressing means 8, but in FIG. 2, a nonmagnetic metal such as plate-like aluminum (as a first conductor of the leakage flux suppressing means 8 is shown.
  • a non-magnetic metal plate 83 is used in a ring shape.
  • An annular nonmagnetic metal plate 83 shown in FIG. 2 is disposed around the heating coil 2 (in FIG. 2, provided to surround the outer periphery of the rice cooker 1 above the heating coil 2).
  • FIG. 1 shows an example in which the conductor 81 is provided as the first conductor of the leakage flux suppressing means 8, but in FIG. 2, a nonmagnetic metal such as plate-like aluminum (as a first conductor of the leakage flux suppressing means 8 is shown.
  • a non-magnetic metal plate 83 is used in a ring shape.
  • the switch means 82 is provided between the pair of terminals of the nonmagnetic metal plate 83 as in the case where the conductive wire 81 is used. .
  • the switch means 82 brings the pair of terminals of the nonmagnetic metal plate 83 into conduction, the nonmagnetic metal plate 83 is short-circuited to electrically form a closed loop.
  • the nonmagnetic metal plate 83 can be used in place of a conducting wire in the second to fifth embodiments to be described later.
  • the configuration of the induction heating cooker 100 according to the first embodiment has been described.
  • movement of the induction heating cooking appliance 100 which concerns on this Embodiment 1 is demonstrated.
  • movement of the induction heating cooking appliance 100 is the same as the case where the conducting wire 81 is used and the case where the nonmagnetic metal plate 83 is used, in the following description, the case where the conducting wire 81 is used will be described as an example. To do. First, description will be made assuming that the switch means 82 is turned on and the leakage magnetic flux suppressing means 8 forms a closed loop.
  • the drive unit 3 is configured by an inverter circuit and supplies a high frequency current to the heating coil 2.
  • a high-frequency current flows through the heating coil 2
  • an alternating magnetic field is generated from the heating coil 2, whereby a magnetic flux is given to the rice cooker 1 that is an object to be heated.
  • the magnetic flux is applied, an eddy current is generated in the rice cooker 1, and Joule heat is generated by the eddy current and the electric resistance of the rice cooker 1, and the rice cooker 1 is heated.
  • the leakage magnetic flux canceling effect of the leakage flux suppressing means 8 is more effective as the magnetic field generated from the conducting wire 81 of the leakage flux suppressing means 8 is stronger.
  • the magnetic field generated in the conducting wire 81 of the leakage flux suppressing means 8 is proportional to the current flowing in the conducting wire 81 constituting the leakage flux suppressing means 8 and the number of turns of the conducting wire 81. Therefore, the greater the current flowing through the conductor 81 or the greater the number of turns of the conductor 81, the higher the effect of suppressing leakage flux.
  • the power loss is proportional to the square of the current, it is effective to reduce the current flowing through the conducting wire 81 in order to reduce the power loss of the leakage flux suppressing means 8.
  • the number of turns of the conducting wire 81 is increased, thereby maintaining the ampere turn and maintaining the leakage flux suppressing effect. By doing in this way, even if it reduces the electric current which flows into the conducting wire 81, the leakage magnetic flux suppression effect is not reduced, but the power loss which generate
  • the current flowing through the conducting wire 81 depends on the resistance value of the conducting wire 81. If the resistance value of the conducting wire 81 is large, the induced current flowing through the conducting wire 81 decreases, and if the resistance value is small, the induced current increases.
  • the resistance value of the conducting wire 81 is proportional to the length of the conducting wire 81 and inversely proportional to the cross-sectional area of the conducting wire 81. Therefore, if the number of turns of the conducting wire 81 is increased, the resistance value is increased and the induced current is decreased. In order to appropriately set the ampere turn of the leakage magnetic flux suppressing means 8, the number of turns of the conducting wire 81 and the cross-sectional area (wire diameter) are set to appropriate values, and the induced current is adjusted.
  • the switch means 82 of the leakage flux suppressing means 8 When the switch means 82 is turned on, the conducting wire 81 of the leakage flux suppressing means 8 is in a closed loop state, so that an induced current that cancels the leakage flux from the heating coil 2 flows to the conducting wire 81 and the leakage flux from the heating coil 2 is canceled out. It is. When the switch means 82 is turned off, the conducting wire 81 constituting the leakage flux suppressing means 8 is opened, so that the induced current that cancels the leakage flux from the heating coil 2 does not flow to the conducting wire 81, and the effect of suppressing the leakage flux. Will disappear.
  • the limit value of leakage magnetic flux generated from the induction heating cooker is determined by international guidelines, and it is necessary to set it below the limit value.
  • the induction heating cooker 100 of this Embodiment 1 can change the heating power which heats the rice cooker 1 according to heating conditions, such as a rice cooking process (here, the rice cooker 1 is heated).
  • the heating power to be described is explained as the input power to the rice cooker 1).
  • the leakage magnetic flux generated from the heating coil 2 is small, and when the input power to the rice cooking pot 1 is large, the leakage magnetic flux generated from the heating coil 2 is also large.
  • the leakage magnetic flux leaking to the outside of the induction heating cooker 100 is less than the limit value of the international guidelines, even if the leakage magnetic flux suppression means 8 does not cancel the leakage magnetic flux. There is.
  • the control unit 5 that performs on / off control of the switch unit 82 switches between the on state and the off state of the switch unit 82 according to the input power to the rice cooker 1. More specifically, when the input power to the rice cooker 1 is less than the threshold and small, the switch means 82 is turned off.
  • a preheating process for maintaining the temperature of the rice cooker 1 at a preheating temperature of about 60 ° C., a boiling process for boiling the cooked food in the rice cooker 1, a boiling maintenance process for maintaining the boiling state, and the rice cooker 1 after cooking are kept warm.
  • the control unit 5 turns the switch means 82 off in these processes.
  • the switch means 82 is turned off, the conducting wire 81 constituting the leakage flux suppressing means 8 is electrically opened. Therefore, even if leakage flux is generated from the heating coil 2, the conducting wire 81 of the leakage flux suppressing means 8 is connected to the conducting wire 81. Inductive current does not flow. Therefore, no power loss due to the induced current occurs in the leakage magnetic flux suppressing means 8.
  • the heating efficiency of the induction heating cooker 100 can be improved by the amount of energy that has been a heat loss in the past, and induction heating cooking.
  • the power consumption of the device 100 can be reduced.
  • the control unit 5 turns on the switch means 82.
  • the control unit 5 turns on the switch unit 82.
  • the leakage flux generated from the induction heating cooker 100 is the international guidelines.
  • the limit value will never be exceeded.
  • the control unit 5 performs switching between the ON state and the OFF state of the switch unit 82 while the drive unit 3 is stopped, that is, in a state where no current flows through the heating coil 2. This is because the electromotive force is generated in the leakage magnetic flux suppressing means 8 while the drive unit 3 is in operation, so switching between the ON state and the OFF state of the switch unit 82 during the operation of the drive unit 3 is not desirable. Because. By performing switching between the ON state and the OFF state of the switch unit 82 while the driving unit 3 is stopped, the electrical stress of the switch unit 82 can be reduced. This also applies to Embodiments 2 to 5 described later.
  • the leakage magnetic flux suppression means which has the conducting wire 81 wound around the rice cooker 1 and the heating coil 2, and the switch means 82 provided between a pair of terminals of this conducting wire 81. 8 was provided. And according to the thermal power which heats the rice cooking pot 1, the ON state and the OFF state of the switch means 82 were switched. For this reason, when the heating power for heating the rice cooker 1 is equal to or greater than the threshold value, the switch means 82 is turned on to short-circuit the lead 81 to form a closed loop, thereby causing an induced current to flow through the lead 81 of the leakage flux suppressing means 8. Leakage flux can be suppressed.
  • the switch means 82 is turned off to electrically open the lead 81 of the leakage magnetic flux suppressing means 8, thereby generating an induced current in the lead 81. It is possible to suppress the power loss that occurs in the leakage magnetic flux suppressing means 8. Therefore, the power consumption of the induction heating cooker 100 can be reduced and the heating efficiency can be improved. Moreover, since the power loss in the leakage magnetic flux suppression means 8 is reduced, the temperature rise inside the casing of the induction heating cooker 100 is also suppressed, and the increase in the capacity of the cooling means for cooling the inside of the casing can be suppressed. For this reason, the power consumption required for the operation of the cooling means and the noise accompanying the operation of the cooling means can be reduced.
  • the switch means 82 shown in Embodiment 1 can be comprised by a contact type relay, a semiconductor relay, or a semiconductor switch (switching element), for example.
  • a semiconductor switch for example, a MOSFET, a bipolar transistor, or an IGBT can be used.
  • a MOSFET MOSFET
  • a bipolar transistor bipolar transistor
  • IGBT IGBT
  • the on-resistance is large, and thus the heat generation of the element itself may increase.
  • the on-resistance of the Si MOSFET increases as the junction temperature increases, there is a concern that a failure may occur.
  • the switch means 82 a semiconductor switch using a wide band gap semiconductor such as a SiC (silicon carbide) MOSFET may be used.
  • the SiC MOSFET has a low on-resistance as a device characteristic, and the on-resistance hardly increases even when the junction temperature rises.
  • the switch means 82 can be arranged near the heat-generating component, thereby reducing the size of the substrate. And cost reduction. Also, the circuit efficiency can be improved.
  • gallium nitride-based materials or diamond can be used as the wide band gap semiconductor.
  • the switch means 82 described here is also applied to Embodiments 2 to 5 described later.
  • Embodiment 1 demonstrated what provided the conducting wire 81 or the nonmagnetic metal plate 83 of the leakage magnetic flux suppression means 8 in the outer periphery of the heating coil 2 and the rice cooker 1, the conducting wire 81 and the nonmagnetic metal plate 83 were demonstrated. Is not limited to this, and is selected in consideration of the direction in which the leakage magnetic flux is to be suppressed and the arrangement of the heating coil 2. For example, if the leakage magnetic flux from the bottom surface of the induction heating cooker 100 is to be suppressed, a conductive wire 81 is wound in a disk shape, for example, on the bottom surface side of the rice cooker 1 and outside the heating coil 2. Switch means 82 is provided between the two terminals.
  • the switch means 82 can be turned on and the terminals of the conducting wire 81 can be electrically short-circuited to constitute the leakage flux suppressing means 8.
  • the matters concerning the conductive wire 81 and the nonmagnetic metal plate 83 are also applied to Embodiments 2 to 5 described later.
  • Embodiment 2 when the switch means 82 is turned on, the conducting wire 81 or the nonmagnetic metal plate 83 electrically forms a closed loop, and the leakage magnetic flux from the heating coil 2 leaks to the outside of the induction heating cooker 100.
  • the leakage magnetic flux suppressing means 8 for suppressing the above has been described.
  • the second embodiment a configuration in which the leakage flux suppressing effect and power loss by the leakage flux suppressing means 8 can be controlled in more detail will be described.
  • the same components as those in the first embodiment are denoted by the same reference numerals, and the difference from the first embodiment will be mainly described.
  • FIG. 4 is a diagram for explaining leakage magnetic flux suppressing means of the induction heating cooker according to the second embodiment.
  • FIG. 4 is a side view of the configuration of the rice cooker 1 and the leakage magnetic flux suppressing means 8.
  • the heating coil 2, the display operation unit 4, the control unit 5, and the drive shown in FIG. 1 of the first embodiment are driven. Drawing of the unit 3, the power supply unit 6 and the cord reel case 7 is omitted here.
  • the leakage magnetic flux suppressing means 8 includes a conducting wire 81 in which a switch means 82 is provided between a pair of terminals, and a conducting wire 84 connected in parallel with the conducting wire 81. Prepare.
  • the conducting wire 81 and the conducting wire 84 are wound around the outer periphery of the rice cooker 1 and the heating coil 2 (not shown in FIG. 4). Unlike the conductive wire 81, the conductive wire 84 is not provided with the switch means 82, and both terminals of the conductive wire 84 are short-circuited to form a closed loop.
  • the conducting wire 81 corresponds to the first conductor of the present invention
  • the conducting wire 84 corresponds to the second conductor of the present invention.
  • FIG. 5 is an equivalent circuit diagram of the conductors shown in FIG. These other configurations are the same as those in the first embodiment.
  • a high-frequency current is supplied to the heating coil 2 and the rice cooking pot 1 is heated.
  • the control part 5 makes the switch means 82 into an ON state or an OFF state according to the input electric power to the rice cooker 1.
  • the control unit 5 turns on the switch unit 82.
  • an induction current is generated in both the conductor 81 and the conductor 84 connected in parallel, the leakage magnetic flux from the heating coil 2 is canceled, and the leakage magnetic flux is prevented from leaking outside the induction heating cooker 100.
  • the control unit 5 turns off the switch means 82. Then, no induced current flows through the conductive wire 81 connected in series with the switch means 82, and an induced current is generated only in the other conductive wire 84 that does not include the switch means 82.
  • the two conductors 81 and 84 connected in parallel are the same, that is, have the same wire diameter and length, only one conductor 84 forms a closed loop when the switch means 82 is in the OFF state. Therefore, the total conductor resistance of the two conductors 81 and 84 is doubled and increased compared to when the switch means 82 is on. Therefore, when the conductor 81 and the conductor 84 are viewed as a whole, the induced current generated in the leakage flux suppressing means 8 is reduced.
  • the power loss of the leakage flux suppressing means 8 is proportional to the resistance and proportional to the square of the current. For example, if the resistance is doubled and the current is halved, the power loss can be halved.
  • produces in the leakage magnetic flux suppression means 8 reduces by making the switch means 82 into an OFF state, an ampere turn becomes small and the suppression effect of leakage magnetic flux falls, In this Embodiment 2, in rice cooking The switch means 82 is turned off only when the input power to the hook 1 is smaller than the threshold value and small. For this reason, the number of turns, the wire diameter, etc.
  • the conducting wire 84 (the conducting wire not provided with the switching device 82) are set so that the leakage magnetic flux when the switching device 82 is turned off is not more than a predetermined limit value. If the ampere turn is adjusted, the leakage flux does not exceed the limit value. In this way, by setting the leakage magnetic flux suppression effect matched to the input power to the rice cooker 1 by the ampere turn and reducing the induced current generated in the leakage magnetic flux suppression means 8 as much as possible, the power in the leakage magnetic flux suppression means 8 Loss can be reduced.
  • FIGS. 4 and 5 show examples in which one conductor 81 and one conductor 84 are provided (two in total), but the number of conductors 81 and 84 is not limited to this.
  • the number of the conductive wires 81 provided with the switch means 82 and the number of the conductive wires 84 provided with no switch means 82 can be determined in accordance with desired effects of suppressing the leakage magnetic flux and reducing the power loss.
  • the leakage magnetic flux suppressing means 8 of the second embodiment includes the conducting wire 81 having the switching means 82 and the conducting wire 84 not having the switching means 82, and the conducting wire 81 and the conducting wire 84 are connected in parallel. .
  • the ampere turn of the leakage flux suppressing means 8 can be adjusted, and the induced power and power loss generated in the leakage flux suppressing means 8 can be controlled. . Therefore, when the switching means 82 is turned off when the heating power for heating the rice cooker 1 is less than the threshold value, no induced current flows through the conducting wire 81, so that the power loss when the leakage flux suppressing means 8 is viewed as a whole is switched.
  • the 82 can be reduced as compared with the on state, power consumption can be reduced, and heating efficiency can be improved. Moreover, since the power loss in the leakage magnetic flux suppression means 8 is reduced, the temperature rise inside the casing of the induction heating cooker 100 is also suppressed, so that the increase in the capacity of the cooling means for cooling the inside of the casing is suppressed. it can. Therefore, it is possible to reduce power consumption required for the operation of the cooling means and noise accompanying the operation of the cooling means.
  • the leakage magnetic flux suppression means 8 of this Embodiment 2 has the conducting wire 84 which always forms a closed loop, even if it is a case where the heating power which heats the rice cooker 1 is less than a threshold value, an induction heating cooking appliance Magnetic flux leaking from 100 to the outside can be suppressed.
  • the resistance values of the conducting wire 81 and the conducting wire 84 may be set by making the winding numbers of the conducting wire 81 and the conducting wire 84 different from each other.
  • FIG. FIG. 6 is a diagram for explaining leakage magnetic flux suppressing means of the induction heating cooker according to the third embodiment.
  • switch means 82 a and 82 b are provided on two conductors 81 (in FIG. 6, distinguished from the conductors 81 a and 81 b) that constitute the leakage magnetic flux suppressing means 8. That is, a plurality of sets (two sets) of switch 81 provided between the lead 81 and both terminals of the lead 81 are provided, and these are connected in parallel.
  • the conducting wire 81a and the conducting wire 81b correspond to the first conductor of the present invention.
  • the control unit 5 switches between the ON state and the OFF state of the switch means 82a and 82b according to the input power to the rice cooker 1. In this way, it is possible to control the induced current and power loss generated in the leakage flux suppressing means 8 more finely than the example shown in FIG. Specifically, the control unit 5 has a plurality of types of input power thresholds for switching between the on state and the off state of the switch units 82a and 82b, and the switch unit 82a according to the magnitude of the input power. , 82b are turned on, only the switch means 82a or the switch means 82b is turned on, or both the switch means 82a and 82b are turned off.
  • the leakage magnetic flux canceling effect by the leakage magnetic flux suppression means 8 matched to the input power to the rice cooker 1 and the leakage magnetic flux can be set, the power of the leakage magnetic flux suppression means 8 can be suppressed while suppressing the leakage magnetic flux. Loss can be further reduced.
  • each of the conductive wires 81a and 81b connected in parallel has different wire diameters
  • different leakage magnetic flux suppressing effects are obtained when only the switch means 82a is turned on and when only the switch means 82b is turned on.
  • the wire diameter of the conductor 81a connected to the switch means 82a is set smaller than the conductor 81b connected to the switch means 82b.
  • the resistance value of the conducting wire is increased, so that the induced current flowing through the conducting wire is reduced and the ampere turn is reduced.
  • the leakage flux suppressing means 8 when the leakage flux suppressing means 8 is viewed as a whole, the leakage flux suppressing effect is smaller when only the switch means 82a is turned on than when only the switch means 82b is turned on, but the induced current is reduced.
  • the power loss of the leakage magnetic flux suppressing means 8 is reduced by the amount of decrease.
  • FIG. 7 is a diagram for explaining the relationship between the on / off state of the switch means of the induction heating cooker according to Embodiment 3 and the input power.
  • FIG. 7 shows a diagram in which the wire diameter of the conducting wire 81a connected to the switch means 82a in FIG. 6 is set smaller than the wire diameter of the conducting wire 81b connected to the switch means 82b.
  • FIG. 7 in the state (period a) in which the input power to the rice cooker 1 is the highest (period a), priority is given to the effect of suppressing the leakage magnetic flux by setting both the switch means 82a and 82b to the on state.
  • each of the conducting wires 81a and 81b connected in parallel have different wire diameters, according to the leakage magnetic flux suppression means 8 as a whole, according to the on / off state of the switch means 82a and the switch means 82b.
  • the resistance values are varied by adjusting the wire diameters of the conductors 81a and 81b, but the lengths of the conductors 81a and 81b are adjusted instead of or in addition to the wire diameter. May be.
  • the leakage magnetic flux suppressing means 8 of the third embodiment is provided with a plurality of sets of the conducting wire 81 and the switching means 82 provided between both terminals of the conducting wire 81, and these are connected in parallel. For this reason, by switching between the ON state and the OFF state of the switch unit 82, the induced power and the power loss generated in the leakage flux suppressing unit 8 can be controlled. Therefore, when the heating power for heating the rice cooker 1 is small, the power loss is achieved by switching between the ON state and the OFF state of the plurality of switch means 82 so that the induced current flowing through the entire leakage magnetic flux suppressing means 8 becomes small. The power consumption of the induction heating cooker 100 can be reduced and the heating efficiency can be improved. Further, by setting the resistance value of two or more of the plurality of conducting wires 81 connected in parallel to different values, the ampere turn of the leakage flux suppressing means 8 can be adjusted more finely. The induced current that flows can be adjusted.
  • FIG. 6 illustrates two sets of conductors 81 and switch means 82 connected in parallel.
  • the number of conductors 81 and switch means 82 is not limited to this, and desired effects of suppressing leakage magnetic flux and reducing power loss.
  • the number can be set according to.
  • Embodiment 4 FIG. In the above-described Embodiments 2 and 3 (FIGS. 4 and 6), the configuration in which the plurality of conductive wires constituting the leakage magnetic flux suppressing means 8 are connected in parallel is shown. In the fourth embodiment, an example will be described in which a plurality of electrically independent conductive wires are provided in the leakage magnetic flux suppressing means 8.
  • FIG. 8 is a diagram for explaining the leakage magnetic flux suppressing means of the induction heating cooker according to the fourth embodiment.
  • the leakage magnetic flux suppression means 8 includes a plurality of sets (two sets in the example of FIG. 8) including the conductive wire 81 and the switch means 82 provided between both terminals of the conductive wire 81. .
  • the two conductors 81 and the switch means 82 are shown separately from the conductors 81a and 81b and the switch means 82a and 82b, respectively.
  • These conducting wires 81a and 81b form a closed loop via the switch means 82a and 82b independently of each other. That is, in the configuration of FIG.
  • the two conductors 81a and 81b are electrically insulated from each other.
  • the control unit 5 controls the on and off states of the switch means 82a and 82b connected to the conductors 81a and 81b in accordance with the input power for heating the rice cooker 1.
  • FIG. 8 shows an example in which two sets of the conductor 81 and the switch means 82 provided between both terminals of the conductor 81 are provided.
  • the number is not limited, and desired leakage magnetic flux suppression is shown. The number can be set according to the effect of reducing the power loss. Moreover, you may set the resistance value of the conducting wire 81 (winding) by varying the winding number of each conducting wire 81 mutually.
  • FIG. 9 is a diagram for explaining leakage magnetic flux suppressing means of the induction heating cooker according to the fifth embodiment.
  • the leakage magnetic flux suppressing means 8 includes a conducting wire 81, a switch means 82 provided between both terminals of the conducting wire 81, and a conducting wire 84 that is electrically independent from the conducting wire 81. . Both ends of the conducting wire 84 that does not have the switch means 82 are electrically short-circuited.
  • the conducting wire 81 corresponds to the first conductor of the present invention
  • the conducting wire 84 corresponds to the second conductor of the present invention.
  • the control unit 5 When the input power to the rice cooker 1 is equal to or greater than the threshold value, the control unit 5 turns on the switch means 82. Thereby, an induction current is generated in both the conductor 81 and the conductor 84 connected in parallel, the leakage magnetic flux from the heating coil 2 is canceled, and the leakage magnetic flux is prevented from leaking outside the induction heating cooker 100. On the other hand, when the input power to the rice cooker 1 is less than the threshold and small, the control unit 5 turns the switch means 82 off.
  • the induction current does not flow through the conductive wire 81 connected in series with the switch means 82, and an induction current is generated only in the other conductive wire 84 not provided with the switch means 82, and the heating coil 2 is generated by the induction current flowing through the conductive wire 84.
  • FIG. 9 shows an example in which one conductive wire 81 having the switch means 82 and one conductive wire 84 not having the switch means 82 are provided
  • the number of the conductive wires 81 and the conductive wires 84 is not limited. The number can be set according to the effect of suppressing leakage magnetic flux and reducing power loss. Further, the resistance values of the conducting wire 81 and the conducting wire 84 may be set by making the winding numbers of the conducting wire 81 and the conducting wire 84 different from each other.
  • the rice cooker is shown as a specific example of the induction heating cooker according to the present invention, but the specific configuration of the induction heating cooker of the present invention is not limited to the rice cooker. If it is a heating cooker that induction-heats an object to be heated such as a container or a pan using a heating coil and can adjust the heating power to be heated, it is placed on an electric pan, a water heater, a top plate, for example The present invention can be applied to a cooker for heating an object to be heated.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

Pour obtenir un cuiseur à chauffage par induction capable de minimiser la perte de puissance causée par un moyen de suppression de fuite de flux magnétique, un cuiseur à chauffage par induction (100) est équipé d'une bobine chauffante (2) permettant de générer un champ magnétique à haute fréquence et de chauffer par induction un corps de cuiseur à riz (1), une unité de commande (3) permettant de fournir un courant à haute fréquence à la bobine chauffante (2) et un moyen de suppression de fuite de flux magnétique (8) : le moyen de suppression de fuite de flux magnétique (8) étant positionné sur l'extérieur de la bobine chauffante (2) vu du corps de cuiseur à riz (1) et comportant un circuit conducteur (81) ayant une paire de bornes et un moyen commutateur (82) permettant de commuter entre un état conducteur et un état ouvert entre les bornes du circuit conducteur (81) ; le moyen de commutation (82) commutant entre l'état conducteur et l'état ouvert entre les bornes du circuit conducteur (81) en fonction de la puissante chauffante avec laquelle la bobine chauffante (2) chauffe le corps de cuiseur à riz (1) ; et quand l'intervalle entre les bornes du circuit conducteur (81) est commuté dans un état conducteur, le circuit conducteur (81) se mettant en court-circuit électrique.
PCT/JP2012/080362 2012-11-22 2012-11-22 Cuiseur à chauffage par induction WO2014080499A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201290001367.XU CN204681616U (zh) 2012-11-22 2012-11-22 感应加热烹调器
PCT/JP2012/080362 WO2014080499A1 (fr) 2012-11-22 2012-11-22 Cuiseur à chauffage par induction
TW102106367A TWI580308B (zh) 2012-11-22 2013-02-23 Induction heating conditioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/080362 WO2014080499A1 (fr) 2012-11-22 2012-11-22 Cuiseur à chauffage par induction

Publications (1)

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WO2014080499A1 true WO2014080499A1 (fr) 2014-05-30

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CN (1) CN204681616U (fr)
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Citations (5)

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Publication number Priority date Publication date Assignee Title
JPS6261291A (ja) * 1985-09-10 1987-03-17 松下電器産業株式会社 誘導加熱調理器用アタツチメント
JPH06260272A (ja) * 1993-03-02 1994-09-16 Matsushita Electric Ind Co Ltd 高周波電力発生装置
JP2005143539A (ja) * 2003-11-11 2005-06-09 Matsushita Electric Ind Co Ltd 炊飯器
JP2005166391A (ja) * 2003-12-02 2005-06-23 Matsushita Electric Ind Co Ltd 誘導加熱調理器
JP2011210425A (ja) * 2010-03-29 2011-10-20 Mitsubishi Electric Corp 誘導加熱調理器

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3711589A1 (de) * 1987-04-06 1988-10-27 Kueppersbusch Kochgeraet
EP0563817A3 (en) * 1992-03-31 1993-11-03 Hoechst Ag Salts of 2-benzoyl-cyclohexane diones, selective herbicidal agents, process for their preparation and their use for combatting weeds
JP3979083B2 (ja) * 2001-12-25 2007-09-19 松下電器産業株式会社 誘導加熱調理器
JP2008034169A (ja) * 2006-07-27 2008-02-14 Matsushita Electric Ind Co Ltd 誘導加熱調理器
US7719055B1 (en) * 2007-05-10 2010-05-18 Northrop Grumman Systems Corporation Cascode power switch topologies

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6261291A (ja) * 1985-09-10 1987-03-17 松下電器産業株式会社 誘導加熱調理器用アタツチメント
JPH06260272A (ja) * 1993-03-02 1994-09-16 Matsushita Electric Ind Co Ltd 高周波電力発生装置
JP2005143539A (ja) * 2003-11-11 2005-06-09 Matsushita Electric Ind Co Ltd 炊飯器
JP2005166391A (ja) * 2003-12-02 2005-06-23 Matsushita Electric Ind Co Ltd 誘導加熱調理器
JP2011210425A (ja) * 2010-03-29 2011-10-20 Mitsubishi Electric Corp 誘導加熱調理器

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CN204681616U (zh) 2015-09-30
TW201422060A (zh) 2014-06-01

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