EP2680668B1 - Induction-heating cookware - Google Patents

Induction-heating cookware Download PDF

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Publication number
EP2680668B1
EP2680668B1 EP11859439.9A EP11859439A EP2680668B1 EP 2680668 B1 EP2680668 B1 EP 2680668B1 EP 11859439 A EP11859439 A EP 11859439A EP 2680668 B1 EP2680668 B1 EP 2680668B1
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EP
European Patent Office
Prior art keywords
inverter circuits
output
heating
heating coil
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP11859439.9A
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German (de)
English (en)
French (fr)
Other versions
EP2680668A1 (en
EP2680668A4 (en
Inventor
Satoshi Nomura
Takashi Shindoi
Miyuki Takeshita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
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Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
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Publication of EP2680668A1 publication Critical patent/EP2680668A1/en
Publication of EP2680668A4 publication Critical patent/EP2680668A4/en
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Publication of EP2680668B1 publication Critical patent/EP2680668B1/en
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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
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • H05B6/065—Control, e.g. of temperature, of power for cooking plates or the like using coordinated control of multiple induction coils
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate

Definitions

  • the present invention relates to an induction heating cooker including a plurality of heating coils.
  • Patent Literature 1 Japanese Unexamined Patent Application Publication No. 6-119968 (paragraph [0017])
  • Patent Literature 1 performs a determination as to the state of a heating target, detects, in the case where the object is moved or removed, that the object has been moved or removed, and stops driving of an inverter circuit. Thus, a wasteful power consumption and an increase of leakage flux can be avoided.
  • the present invention has been designed to overcome the problem mentioned above, and provides an induction heating cooker as defined in claim or in claim 2 for which in the case where high-frequency current flows to a plurality of heating coils at the same time, the accuracy of the determination as to whether or not a heating target is placed above the individual heating coils can be increased.
  • An induction heating cooker includes inter alia a plurality of heating coils; a plurality of inverter circuits that supply a high-frequency current to the heating coils; output current detecting means for detecting an output current of each of the inverter circuits; power detecting means for detecting input power or output power of each of the inverter circuits; load determining means for performing a load determination on the basis of the output current detected by the output current detecting means and the input power or the output power detected by the power detecting means; and control means for performing individual drive control of each of the inverter circuits.
  • the control means drives, in a case where two or more inverter circuits of the plurality of inverter circuits are driven at the same time, the inverter circuits at the same driving frequency, acquires output currents of the driven inverter circuits, and performs drive control for the inverter circuits in such a manner that a phase difference between the acquired output currents is reduced.
  • the load determining means performs the load determination on the basis of the output current detected by the output current detecting means and the input power or the output power detected by the power detecting means for the driven inverter circuits.
  • the present invention in the case where high-frequency current flows to a plurality of heating coils at the same time, power movement occurring between the plurality of heating coils can be suppressed, and the accuracy of the determination as to whether or not a heating target is placed above the individual heating coils can be increased.
  • Fig. 1 is a diagram illustrating the configuration of an induction heating cooker according to Embodiment 1.
  • 101 denotes a top plate
  • 102 denotes a main body casing
  • 103 denotes a circuit that supplies a high-frequency current
  • 104 denotes an operating unit
  • 105 denotes display means
  • 22 denotes a heating coil.
  • the top plate 101 is provided so that a heating target such as a pan or the like is placed thereon. Heating ports 106 on which positions where pans are to be placed are indicated are arranged on the top plate 101.
  • the circuit 103, the display means 105, and the heating coils 22 are accommodated inside the main body casing 102.
  • the upper surface of the main body casing 102 is covered with the top plate 101 so that the internal configuration of the main body casing 102 is accommodated.
  • the circuit 103 has the configuration explained later with reference to Fig. 2 and supplies a high-frequency current to the heating coils 22.
  • the operating unit 104 is provided for a user to adjust heating output.
  • the display means 105 is a screen display device including a liquid crystal display device or the like and displays the operation state of the induction heating cooker.
  • the plurality of heating coils 22 are arranged, for each heating port, in each of a depth direction and a lateral direction.
  • Fig. 2 is a diagram illustrating the circuit configuration of the induction heating cooker according to Embodiment 1.
  • the induction heating cooker is connected to an alternating-current power supply 1. Power supplied from the alternating-current power supply 1 is converted into direct-current power by a direct-current power supply circuit 2.
  • the direct-current power supply circuit 2 includes a rectifying diode bridge 3 that rectifies alternating-current power and a reactor 4 and a smoothing capacitor 5 that are arranged for each of the inverter circuits 9.
  • Input power input to each of the inverter circuits 9 is detected by input voltage detecting means 7 and input current detecting means 6 that is provided for each of the inverter circuits 9.
  • the power converted into direct-current power by the direct-current power supply circuit 2 is supplied to each of the inverter circuits 9-1 to 9-n.
  • the input current detecting means 6 and the input voltage detecting means 7 constitute "power detecting means” according to the present invention.
  • the plurality of inverter circuits 9-1 to 9-n are connected to the direct-current power supply circuit 2.
  • the inverter circuits 9-1 to 9-n have the same configuration.
  • the inverter circuits 9-1 to 9-n will be referred to as inverter circuits 9 when the inverter circuits 9-1 to 9-n are not distinguished from one another.
  • the inverter circuits 9 are provided in accordance with the number of the heating coils 22.
  • the inverter circuits 9 are each formed of two sets of arms that are each formed of two switching elements (IGBTs) that are connected in series between the same positive and negative buses of the direct-current power supply circuit 2 and diodes connected in anti-parallel with the switching elements (hereinafter, two sets of arms are referred to as a U-phase arm 10 and a V-phase arm 11, and a switching element on the positive bus side of each of the arms and a switching element on the negative bus side of each of the arms are referred to as an upper switch and a lower switch, respectively).
  • IGBTs switching elements
  • the U-phase arm 10 includes an upper switch 12, a lower switch 13, an upper diode 14 connected in anti-parallel with the upper switch 12, and a lower diode 15 connected in anti-parallel with the lower switch 13.
  • the V-phase arm 11 includes an upper switch 16, a lower switch 17, an upper diode 18 connected in anti-parallel with the upper switch 16, and a lower diode 19 connected in anti-parallel with the lower switch 17.
  • the upper switch 12 and the lower switch 13 forming the U-phase arm 10 are on/off driven in accordance with a driving signal output from a U-phase driving circuit 20.
  • the upper switch 16 and the lower switch 17 forming the V-phase arm 11 are on/off driven in accordance with a driving signal output from a V-phase driving circuit 21.
  • the U-phase driving circuit 20 outputs a driving signal for alternately turning on and off the upper switch 12 and the lower switch 13 in such a manner that the lower switch 13 is turned off during the period in which the upper switch 12 of the U-phase arm 10 is turned on and the lower switch 13 is turned on during the period in which the upper switch 12 is turned off.
  • the V-phase driving circuit 21 outputs a driving signal for alternately turning on and off the upper switch 16 and the lower switch 17 of the V-phase arm 11.
  • a load circuit 24 including the heating coil 22 and a resonant capacitor 23 is connected between output points of the two arms in each of the inverter circuits 9.
  • the heating coil 22 and the resonant capacitor 23 form a series resonant circuit and have a resonant frequency.
  • the load circuit 24 has inductive characteristics.
  • Control means 25 performs drive control of each of the inverter circuits 9-1 to 9-n and performs a function of controlling the entire induction heating cooker.
  • the control means 25 controls heating output, using detection values from the input current detecting means 6 and the input voltage detecting means 7, on the basis of a heating power instruction set by a user using the operating unit 104, in a full-bridge operation mode in which high-frequency driving signals are output from both the U-phase driving circuit 20 and the V-phase driving circuit 21.
  • Output current detecting means 28 detects a current (hereinafter, referred to as an output current) flowing to the load circuit 24 including the heating coil 22 and the resonant capacitor 23.
  • Load determining means 26 arranged inside the control means 25 performs determination as to whether or not a suitable pan (suitable load) is placed above the heating coils 22 on the basis of the correlation between an output current detected by the output current detecting means 28 and an input current detected by the input current detecting means 6 (hereafter referred to as "load determination").
  • suitable pans mean pans that are suitable for induction heating and include objects to be heated other than unsuitable pans.
  • unsuitable pans described here mean low-resistance pans including aluminum pans that are made of a low-efficiency material and that cannot be heated, small articles including forks and spoons that should not be heated, and the state where a heating target is not placed.
  • the load determining means 26 performs a load determination on the basis of an output current and an input current.
  • the present invention is not limited to this.
  • load determination may be performed using input power or output power of the inverter circuits 9, instead of the input current, on the basis of the input power or the output power and the output current.
  • output voltage detecting means for detecting a voltage (effective value) output from the inverter circuits 9 to the load circuits 24 can be additionally provided so that output power can be detected on the basis of the output voltage and the output current detected by the output current detecting means 28.
  • Fig. 3 and Fig. 4 are diagrams illustrating examples of driving signals and output voltage waveforms of an inverter circuit in the induction heating cooker according to Embodiment 1:
  • a preceding arm in Fig. 3 and Fig. 4 refers to an arm, of the U-phase arm 10 and the V-phase arm 11, whose change in output potential precedes the other arm
  • a following arm refers to an arm, of the U-phase arm 10 and the V-phase arm 11, whose change in output potential follows the other arm.
  • the control means 25 controls driving signals output from the U-phase driving circuits 20 and the V-phase driving circuits 21, and drives the inverter circuits 9 at a frequency higher than the resonant frequency of the load circuits 24.
  • a driving signal output from a U-phase driving circuit 20 to a corresponding upper switch 12 and a corresponding lower switch 13 has the same frequency as that of a driving signal output from a V-phase driving circuit 21 to a corresponding upper switch 16 and a corresponding lower switch 17.
  • the phase of a driving signal from a preceding arm (U-phase driving circuit 20) is advanced relative to the phase of a driving signal from a following arm (V-phase driving circuit 21), and thus a phase difference occurs between the output potential of the preceding arm and the output potential of the following arm.
  • the phase difference between arms Based on this phase difference (hereinafter, also referred to as the phase difference between arms), the time of application of the output voltage of the inverter circuits 9 is controlled, and the magnitude of the output current flowing to the load circuits 24 can be controlled.
  • phase difference between the arms is increased, and the voltage application duration in one cycle is thus increased.
  • phase difference between the arms is reduced compared to the high output state, and the voltage application duration in one cycle is thus reduced.
  • phase difference between the arms is further reduced, and the voltage application duration in one cycle is thus further reduced.
  • the upper limit of the phase difference between the arms is applied to the case of an opposite phase (a phase difference of 180°), and the output voltage waveform at this time is substantially a rectangular wave. Furthermore, the lower limit of the phase difference between the arms is set to, for example, a level that does not cause a situation in which an excessive current flows to a switching element due to the relation with the phase of a current flowing to the load circuit 24 or the like when the switching element is turned on and the switching element breaks down.
  • Fig. 5 includes diagrams illustrating an example of the positional relationship between heating coils and load (pan) to be heated in the induction heating cooker according to Embodiment 1.
  • Fig. 5(a) is an explanatory diagram illustrating the state when the arrangement of the heating coils 22 is viewed from the above
  • Fig. 5(b) is an explanatory diagram illustrating the state when the arrangement of the heating coils 22 is viewed from a side.
  • neighboring heating coils 22 are wound in opposite circumferential directions. When high-frequency currents that are in phase with each other are output from the inverter circuits 9, high-frequency currents having phases shifted from each other by 180 degrees flow to the neighboring heating coils 22.
  • Fig. 6 is a diagram illustrating an example of heating permission/inhibition determining conditions at the time when heating starts in the induction heating cooker according to Embodiment 1.
  • the heating coil 22 arranged at a central portion of the heating port 106 is referred to as a central heating coil 22a.
  • peripheral heating coils 22b-1 to 22b-8 the heating coils 22 arranged in the lateral direction and the depth direction relative to the central heating coil 22a are referred to as peripheral heating coils 22b-1 to 22b-8.
  • the peripheral heating coils 22b-1 to 22b-8 are not distinguished from one another, they are referred to as the peripheral heating coils 22b or the peripheral heating coil 22b.
  • the number of the peripheral heating coils 22b is not limited to this. Any number of peripheral heating coils 22b may be arranged.
  • the inverter circuit 9 that drives the central heating coil 22a is also referred to as an inverter circuit 9a for the central heating coil
  • the inverter circuits 9 that drive the peripheral heating coils 22b-1 ⁇ 22b-n are also referred to as inverter circuits 9b-1 ⁇ 9b-n for the peripheral heating coil (1 ⁇ n).
  • the load determining means 26 acquires an output current detected by the output current detecting means 28 and an input current detected by the input current detecting means 6 at a specific timing (described later) in the heating control. Then, by referring to, for example, information illustrated in Fig. 6 , the load determining means 26 determines, on the basis of the acquired output current and input current, whether or not the load placed above each of the heating coils 22 is a suitable load.
  • the output current is large as illustrated in Fig. 6
  • a low-resistance pan that cannot be heated and that is made of a low-efficiency material, such as an aluminum pan
  • the input current is small
  • suitable load which is a load suitable for heating, is placed.
  • the load determining means 26 determines that the suitable pan is placed above the central heating coil 22a and the peripheral heating coil 22b-2.
  • control means 25 drives the inverter circuit 9a for the central heating coil and the inverter circuit 9b-2 for the peripheral heating coil 2 above which the suitable pan is mounted. A heating control operation will be described later.
  • the plurality of heating coils 22 are arranged in adjacent to one another, and in cooking by heating, the plurality of heating coils 22 may be driven at the same time.
  • Fig. 7 is a diagram illustrating the state of magnetic coupling between heating coils in the induction heating cooker according to Embodiment 1.
  • heating coils A and B are represented by heating coils A and B.
  • a determination as to whether or not a heating target is placed above each of heating coil is made on the basis of an output current flowing to the heating coil and power (equivalent to input current) input to or output from the heating coil.
  • the load determining means 26 cannot correctly perform load determination. Meanwhile, when the phase difference ⁇ is set to 0, power does not move between the heating coils. Thus, the accuracy of the determination regarding the load determination can be increased.
  • Fig. 8 is a diagram illustrating the flow of power among inverter circuits, heating coils, and a heating target in the induction heating cooker according to Embodiment 1.
  • Fig. 9 is a diagram illustrating determining conditions as to whether or not load to be heated is placed in the induction heating cooker according to Embodiment 1.
  • the measurement value of power (detection value of the power detecting means) output from the inverter circuit 9a to the heating coil A is represented by Pa
  • the measurement value of an output current (detection value of the output current detecting means 28) flowing to the heating coil A is represented by la
  • the measurement value of power (detection value of the power detecting means) output from the inverter circuit 9b to the heating coil B is represented by Pb
  • the measurement value of an output current (detection value of the output current detecting means 28) flowing to the heating coil B is represented by lb.
  • the power moved from the heating coil A to the heating coil B is represented by Pab.
  • the pan 200 which is a suitable pan, is placed above the heating coils A and B, the pan 200 is magnetically coupled to the heating coils A and B.
  • the load resistance that can be observed from the inverter circuit 9a and the resistance determined on the basis of magnetic coupling between the heating coil A and the pan 200 (object to be heated) are represented as follows:
  • the load resistance that can be observed from the inverter circuit 9b and the resistance determined on the basis of magnetic coupling between the heating coil B and the pan 200 (object to be heated) are represented as follows:
  • the input current (equivalent to Pb) is detected as a small value by the input current detecting means 6 for the inverter circuit 9b.
  • a false result of determination may be obtained as absence of load, a small article, or a low-resistance pan, in the load determination for the heating coil B (see Fig. 6 ).
  • Fig. 10 is a flowchart illustrating a heating control process by the control means in the induction heating cooker according to Embodiment 1.
  • control means 25 determines whether or not a heating start request, such as setting of a heating power using the operating unit 104, has been input (S101).
  • Fig. 11 is a flowchart illustrating an initial load determining process by the control means in the induction heating cooker according to Embodiment 1.
  • the control means 25 causes the inverter circuit 9a for the central heating coil to be driven at a specific output (specific frequency ⁇ specific phase difference between arms) (S201).
  • the control means 25 acquires, for the inverter circuit 9 being driven, an output current detected by the output current detecting means 28 and an input current detected by the input current detecting means 6 (S202).
  • the control means 25 causes the output of the inverter circuit 9a for the central heating coil to be stopped after a certain period of time has passed (S203).
  • the load determining means 26 determines, on the basis of the acquired output current and input current and heating permission/inhibition determining conditions (for example, Fig. 6 ), whether or not a suitable load is placed above the central heating coil 22a. Then, the load determining means 26 sets (stores) a result of load determination (S204).
  • the initial load determining process is terminated. Meanwhile, in the case where it is determined that a suitable load is placed above the central heating coil 22a, the process proceeds to load determining processing for the peripheral heating coil 22b-1 (S205).
  • peripheral heating coils 22b are arranged in this embodiment, the present invention is not limited to this. Furthermore, the above-described initial load determining processing is performed in an appropriate manner in accordance with the number of the peripheral heating coils 22b.
  • control means 25 determines whether or not it is determined that suitable load is placed above the central heating coil 22a (S102). In the case where no suitable load is placed above the central heating coil 22a, the process returns to step S101 to repeat the above-described operation.
  • the control means 25 starts driving of the inverter circuit 9a for the central heating coil and the peripheral heating coil inverter circuit 9b for which it is determined that the suitable load is placed above the inverter circuit 9a for the central heating coil and the peripheral heating coil inverter circuit 9b in step S200 (S103).
  • the inverter circuits 9 are driven at the same driving frequency.
  • control means 25 acquires, for each of the inverter circuits 9 being driven, the output current detected by the output current detecting means 28 and the input current detected by the input current detecting means 6 (S104).
  • the load determining means 26 determines, on the basis of the output current and the input current of the central heating coil 22a and heating permission/inhibition conditions ( Fig. 6 ), whether or not a suitable load is placed above the central heating coil 22a (S105).
  • step S112 in which the control means 25 stops the driving of all the inverter circuits, and then returns to step S101.
  • control means 25 compares set power (heating power) set by a user using the operating unit 104 with an input power calculated on the basis of the detection values detected by the input current detecting means 6 and the input voltage detecting means 7 (S106).
  • step S106 it is determined whether or not the phase difference between the arms of the inverter circuit 9a for the central heating coil is smaller than the upper limit (180 degrees (half-cycle) (S107).
  • control means 25 increases the phase difference between the arms of the inverter circuit 9a for the central heating coil (S108), and the process proceeds to the output control process for the peripheral haring coils 22b.
  • step S109 it is determined whether or not the phase difference between the arms of the inverter circuit 9a for the central heating coil is greater than a lower limit value (S109).
  • the lower limit value of the phase difference between the arms is set to, for example, a level that does not cause a situation where excessive current flows to a switching element due to the relation with the phase of the current flowing to the load circuit 24 or the like when the switching element is turned on and the switching element breaks down.
  • the process proceeds to the output control process for the peripheral heating coils 22b.
  • control means 25 reduces the phase difference between the arms of the inverter circuit 9a for the central heating coil (S110), and the process proceeds to the output control process for the peripheral heating coils 22b.
  • step S106 the process proceeds to the output control process for the heating coils 22b.
  • the control means 25 performs the output control process for the peripheral heating coils 22b-1, 22b-2, ⁇ , 22b-8 (S300-1 to 300-8). The details of the control will be explained with reference to Fig. 12 .
  • a peripheral heating coil 22b for which an output control process is performed is referred to as a peripheral heating coil n
  • an inverter circuit 9 that drives the peripheral heating coil n is referred to as an inverter circuit 9b-n for the peripheral heating coil n.
  • Fig. 12 is a flowchart illustrating an output control process for an inverter circuit for the peripheral heating coil n by the control means in the induction heating cooker according to Embodiment 1.
  • the control means 25 determines whether or not an inverter circuit 9b-n for the peripheral heating coil n is being driven (S301). In the case where the inverter circuit 9b-n for the peripheral heating coil n is not being driven, the output processing for the peripheral heating coil n is terminated.
  • the control means 25 acquires, for the inverter circuit 9b-n for the peripheral heating coil n, the output current detected by the output current detecting means 28 and the input current detected by the input current detecting means 6 (S302).
  • the control means 25 determines whether or not the acquired output current is greater than a specific overcurrent value (S303). In the case where the output current is greater than the specific overcurrent value, the control means 25 stops the driving of the inverter circuit 9b-n for the peripheral heating coil n (S304), and terminates the output processing for the inverter circuit 9b-n for the peripheral heating coil n.
  • a determination as to the phase of the output current of the inverter circuit 9b-n for the peripheral heating coil n is performed on the basis of the output current of the inverter circuit 9a for the central heating coil (S305).
  • the control means 25 causes the phase of a driving signal of the inverter circuit 9b-n for the peripheral heating coil n to be advanced, so that the phase of the output voltage of the peripheral heating coil n is advanced (shift correction for delayed current). Accordingly, the phase difference from the phase of the output current of the central heating coil is reduced (S306).
  • the control means 25 causes the phase of a driving signal of the inverter circuit 9b-n for the peripheral heating coil n to be delayed, so that the phase of the output voltage of the peripheral heating coil n is delayed (shift correction for advanced current). Accordingly, the phase difference from the phase of the output current of the central heating coil is reduced (S307).
  • the phase of a driving signal may be advanced (or delayed) by a specific amount of time.
  • the phase difference between output currents is detected, and the phase may be advanced (or delayed) by the time corresponding to the phase difference.
  • the output currents are made substantially in phase with each other eventually.
  • Fig. 13 includes diagrams illustrating examples in which the phase difference between output currents is reduced in the induction heating cooker according to Embodiment 1:
  • the output current of the peripheral heating coil n before phase correction, has a delayed phase (01) relative to the output current of the central heating coil 22a.
  • the output currents can be made substantially in phase with each other after the phase correction.
  • the output current of the peripheral heating coil n before phase correction, has an advanced phase ( ⁇ 2) relative to the output current of the central heating coil.
  • the output currents can be made substantially in phase with each other after the phase correction.
  • the load determining means 26 determines whether or not suitable load is placed above the peripheral heating coil n (S308).
  • control means 25 stops driving of the inverter circuit 9b-n for the peripheral heating coil n (S309), and terminates the output processing for the peripheral heating coil n.
  • step S306 or S307 described above is performed or in the case where a suitable load is placed in step S308, the control means 25 compares the output current of the central heating coil 22a with the output current of the peripheral heating coil n (S310).
  • step S310 it is determined whether the phase difference between the arms of the inverter circuit 9b-n for the peripheral heating coil n is smaller than the upper limit (180 degrees (half cycle)) (S311).
  • control means 25 increases the phase difference between the arms of the inverter circuit 9b-n for the peripheral heating coil n (S312), and terminates the output processing for the peripheral heating coil n.
  • step S310 it is determined whether the phase difference between the arms of the inverter circuit 9b-n for the peripheral heating coil n is greater than a lower limit value (S313).
  • the lower limit value of the phase difference between the arms is set to, for example, a level that does not cause a situation where excessive current flows to a switching element due to the relation with the phase of the current flowing to the load circuit 24 or the like when the switching element is turned on and the switching element breaks down.
  • control means 25 reduces the phase difference between the arms of the inverter circuit 9b-n for the peripheral heating coil n (S314), and terminates the output processing for the peripheral heating coil n.
  • step S310 In the case where the output current of the central heating coil 22a and the output current of the peripheral heating coil n are substantially the same (step S310; ⁇ ), the output processing for the peripheral heating coil n is terminated.
  • control means 25 determines whether or not an operation for a heating stop request to be set by a user using the operating unit 104 has been performed (S111).
  • step S104 the process returns to step S104 to repeat the above-described operation.
  • step S112 in which the control means 25 causes the driving of all the inverter circuits 9 to be stopped. Then, the process returns to step S101.
  • the present invention is not limited to this.
  • the load state of the individual heating coils 22 may be determined, and the phase of the driving signal of each of the inverter circuits 9 may be moved (corrected) so that the high-frequency currents flowing to the heating coils 22 can be made substantially in phase with one another.
  • the above description is directed to the case where the operation for sequentially reducing the phase difference between the output current of the central heating coil 22a and the output current of each of the peripheral heating coils n.
  • the present invention is not limited to this. Any operation can be employed as long as it reduces the phase between the output currents of a plurality of heating coils 22 that are being driven at the same time.
  • the phase of the output voltage of the central heating coil 22a may be controlled. Furthermore, control may be performed such that, on the basis of the output current of a reference heating coil 22 being driven, the phase difference of the output current of another heating coil 22 from the reference heating coil 22 is reduced, without distinction between the central heating coil 22a and a peripheral heating coil n.
  • the inverter circuits 9 are driven at the same driving frequency. Furthermore, the output currents of the driven inverter circuits 9 are acquired, and drive control for the inverter circuits 9 is performed in such a manner that the phase difference between the acquired output currents is reduced. Then, load determination is performed on the basis of the output currents detected by the output current detecting means 28 for the driven inverter circuits 9 and the input power or output power detected by the power detecting means.
  • neighboring heating coils 22 are wound in opposite circumferential directions, and power movement between the heating coils 22 is suppressed by reducing the phase difference between output currents from the inverter circuits 9 to the heating coils 22.
  • winding neighboring heating coils 22 in the same circumferential directions and causing the phase difference between currents output from the inverter circuits 9 to the neighboring heating coils 22 to approach a difference of 180 degrees is also equivalent operation for suppressing power movement between the heating coils 22.
  • the phases of the output voltage of the inverter circuits 9 are controlled such that the phase difference between the output currents is reduced.
  • the phase difference between currents flowing to the heating coils 22 that are being driven can be reduced, and power movement occurring between neighboring heating coils 22 can be suppressed. Therefore, the accuracy of the load determination based on the output current and the input power or output power (input current) can be increased.
  • driving signals output to the switching elements of the inverter circuits 9 are controlled such that the phase difference between output currents is reduced.
  • the phase difference between the currents flowing to the heating coils 22 that are being driven can be reduced, and power movement occurring between neighboring heating coils 22 can be suppressed. Therefore, the accuracy of the load determination based on the output current and the input power or output power (input power) can be increased.
  • the load determining means 26 determines whether or not a suitable load is placed above heating coils 22 on the basis of the correlation between output currents detected by the output current detecting means 28 and input power or output power detected by the power detecting means. Then, the control means 25 stops driving of inverter circuits 9 for heating coils 22 above which no suitable load is placed, on the basis of the result of determination by the load determining means 26.
  • the determination as to whether or not suitable load is placed can be accurately performed.
  • heating of an object (load) that is not suitable for being heated can be prevented.
  • the heating coils 22 can be prevented from being driven in the no-load state where no load is place above heating coils 22.
  • Embodiment 2 an embodiment in which the inverter circuits 9 each have a half-bridge configuration will be explained.
  • Fig. 14 is a diagram illustrating the circuit configuration of an induction heating cooker according to Embodiment 2.
  • Individual inverter circuits 9' in Embodiment 2 each have a half-bridge configuration and each include a switching element (upper switch 12') on a higher potential side, a switching element (lower switch 13') on a lower potential side, an upper diode 14' connected in anti-parallel with the upper switch 12', and a lower diode 15' connected in anti-parallel with the lower switch 13'.
  • a load circuit 24' is connected between output points of each of the inverter circuits 9'.
  • the load circuit 24' includes a heating coil 22, a resonant capacitor 23, and a clamp diode 27 connected in parallel to the resonant capacitor 23.
  • the clamp diode 27 clamps the potential of the connection point between the heating coil 22 and the resonant capacitor 23 at the potential of a bus on a lower potential side of a direct-current power supply. Due to the operation of the clamp diode 27, communication of the current flowing to the heating coil 22 does not take place in the state where the lower switch 13' is connected.
  • the upper switch 12' and the lower switch 13' are on/off driven in accordance with a driving signal output from a driving circuit 20'.
  • control means 25 When the control means 25 according to this embodiment alternately turns on and off the switching element on the higher potential side (upper switch 12') and the switching element on the lower potential side (lower switch 13'), a high-frequency voltage is generated between: the connection point therebetween; and one end of the direct-current bus.
  • the control means 25 thus supplies the high-frequency voltage to the load circuit 24'.
  • Fig. 15 includes diagrams illustrating examples of driving signals of an inverter circuit in the induction heating cooker according to Embodiment 2:
  • the control means 25 controls driving signals output from the driving circuits 20', and drives the inverter circuits 9' at a frequency higher than the resonant frequency of the load circuits 24'.
  • control means 25 when the control means 25 in this embodiment controls the duty ratio of a switching element on the higher potential side (upper switch 12') and a switching element on the lower potential side (lower switch 13'), the application time of the output voltage of the inverter circuit 9' is controlled.
  • the control means 25 is capable of controlling the magnitude of the output current flowing to the load circuit 24'.
  • the duty ratio (on-duty ratio) of the upper switch 12' is increased, and the voltage application duration in one cycle is thus increased.
  • the duty ratio (on-duty ratio) of the upper switch 12' is reduced compared to the high output state, and the voltage application duration in one cycle is thus reduced.
  • the duty ratio (on-duty ratio) of the upper switch 12' is further reduced, and the voltage application duration in one cycle is further reduced.
  • Fig. 16 is a flowchart illustrating a heating control process by the control means in the induction heating cooker according to Embodiment 2.
  • Fig. 17 is a flowchart illustrating an output control process for an inverter circuit for the peripheral heating coil n by the control means in the induction heating cooker according to Embodiment 2.
  • an inverter circuit 9' that drives the central heating coil 22a is referred to as an inverter circuit 9'a for the central heating coil
  • inverter circuits 9' that drive the peripheral heating coils 22b-1 ⁇ 22b-n are referred to as inverter circuits 9'b-1 ⁇ 9'b-n for the peripheral heating coil (1 ⁇ n).
  • step S106 In the case where input power is smaller than set power in step S106 (step S106; >), it is determined whether the duty ratio of the upper switch 12' of the inverter circuit 9'a for the central heating coil is smaller than the upper limit (S401).
  • the control means 25 increases the duty ratio of the upper switch 12' of the inverter circuit 9'a for the central heating coil (S402), and the process proceeds to the output control process for the peripheral heating coils 22b.
  • step S106 it is determined whether the duty ratio of the upper switch 12' of the inverter circuit 9'a for the central heating coil is greater than a lower limit value (S403).
  • the control means 25 reduces the duty ratio of the upper switch 12' of the inverter circuit 9'a for the central heating coil (S404), and the process proceeds to the output control process for the peripheral heating coils 22b.
  • step S106 the process proceeds to the output control process for the peripheral heating coils 22b.
  • step S310 it is determined whether the duty ratio of the upper switch 12' of an inverter circuit 9'b-n for the peripheral heating coil n is smaller than the upper limit (S501).
  • the control means 25 increases the duty ratio of the upper switch 12' of the inverter circuit 9'b-n for the peripheral heating coil n (S502), and terminates the output processing for the peripheral heating coil n.
  • step S310 it is determined whether the duty ratio of the upper switch 12' of the inverter circuit 9'b-n for the peripheral heating coil n is greater than a lower limit value (S503).
  • the control means 25 reduces the duty ratio of the upper switch 12' of the inverter circuit 9'b-n for the peripheral heating coil n (S504), and terminates the output processing for the peripheral heating coil n.
  • step S310 In the case where the output current of the central heating coil 22a and the output current of the peripheral heating coil n are substantially the same in step S310 (step S310; ⁇ ), the output processing for the peripheral heating coil n is terminated.
  • the inverter circuits 9' each have a half-bridge configuration. Even with this configuration, effects similar to those in Embodiment 1 described above can be achieved.
  • a circuit configuration may be employed in which both the inverter circuit 9' having a half-bridge configuration in Embodiment 2 and the inverter circuit 9 having a full-bridge configuration in Embodiment 1 exist.
  • the present invention is not limited to this.
  • the plurality of heating coils 22 may include a central heating coil 22a arranged at a central portion of each of the heating ports 106 arranged on the top plate 101 and a plurality of peripheral heating coils 22b arranged in a circumferential direction of the central heating coil 22a.
  • the plurality of heating coils 22 may include an inner heating coil 22' arranged at a central portion of each of the heating ports 106 arranged on the top plate 101 and an outer heating coil 22' wound so as to surround the inner heating coil 22'.
  • the central heating coil 22a in the operation explanation described above corresponds to the inner heating coil 22' and the peripheral heating coil 22b corresponds to the outer heating coil 22'.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
  • General Induction Heating (AREA)
EP11859439.9A 2011-02-21 2011-11-29 Induction-heating cookware Not-in-force EP2680668B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011035123 2011-02-21
PCT/JP2011/006621 WO2012114405A1 (ja) 2011-02-21 2011-11-29 誘導加熱調理器

Publications (3)

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EP2680668A1 EP2680668A1 (en) 2014-01-01
EP2680668A4 EP2680668A4 (en) 2014-08-13
EP2680668B1 true EP2680668B1 (en) 2016-06-22

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EP11859439.9A Not-in-force EP2680668B1 (en) 2011-02-21 2011-11-29 Induction-heating cookware

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EP (1) EP2680668B1 (zh)
JP (1) JP5649714B2 (zh)
CN (2) CN105007643B (zh)
ES (1) ES2586583T3 (zh)
WO (1) WO2012114405A1 (zh)

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KR102031907B1 (ko) 2013-01-02 2019-10-14 엘지전자 주식회사 전자 유도 가열 조리기 및 이의 구동 방법
KR102037311B1 (ko) 2013-01-02 2019-11-26 엘지전자 주식회사 전자 유도 가열 조리기 및 이의 구동 방법
JP6154216B2 (ja) * 2013-07-02 2017-06-28 株式会社ダイヘン インバータ回路の制御回路、この制御回路を備えたインバータ装置、このインバータ装置を備えた誘導加熱装置、および、制御方法
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Also Published As

Publication number Publication date
CN103404229B (zh) 2015-07-29
JPWO2012114405A1 (ja) 2014-07-07
ES2586583T3 (es) 2016-10-17
WO2012114405A1 (ja) 2012-08-30
EP2680668A1 (en) 2014-01-01
JP5649714B2 (ja) 2015-01-07
CN105007643B (zh) 2017-01-04
EP2680668A4 (en) 2014-08-13
CN103404229A (zh) 2013-11-20
CN105007643A (zh) 2015-10-28

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