EP2661152B1 - Inductive heating cooker - Google Patents

Inductive heating cooker Download PDF

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Publication number
EP2661152B1
EP2661152B1 EP12746467.5A EP12746467A EP2661152B1 EP 2661152 B1 EP2661152 B1 EP 2661152B1 EP 12746467 A EP12746467 A EP 12746467A EP 2661152 B1 EP2661152 B1 EP 2661152B1
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EP
European Patent Office
Prior art keywords
heating
output
power
heating coil
load
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
EP12746467.5A
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German (de)
English (en)
French (fr)
Other versions
EP2661152A1 (en
EP2661152A4 (en
Inventor
Satoshi Nomura
Miyuki Takeshita
Takashi Shindoi
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
Original Assignee
Mitsubishi Electric Home Appliance Co Ltd
Mitsubishi Electric Corp
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Publication of EP2661152A1 publication Critical patent/EP2661152A1/en
Publication of EP2661152A4 publication Critical patent/EP2661152A4/en
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Publication of EP2661152B1 publication Critical patent/EP2661152B1/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
    • 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
    • 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
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the present invention relates to an induction heating cooker including a plurality of heating coils.
  • an induction heating cooker including load detecting means for detecting that a heating target is placed on the top plate, wherein the load detecting means detects, for each of the heating coils, that a heating target is placed above the heating coil, and wherein the circuit supplies high-frequency current only to the heating coil for which the load detecting means detects that a heating target is placed above the heating coil" is suggested (for example, see Patent Literature 1).
  • an input/output-device which is characterized by improved cleanability and usability and comprises a power receiving resonance circuit which acts as a power receiving means for receiving power based on the change of a magnetic flux and which comprises a communication resonance circuit which acts as a transmitting/receiving-means for wirelessly transmitting and receiving information (for example, see Patent Literature 2).
  • Patent Literature 1 by supplying a high-frequency current only to a heating coil for which a heating target is detected, a reduction in the heating efficiency and an increase of leakage flux according to the size of a pan and the place where the pan is placed can be suppressed.
  • the present invention has been designed to solve the above-mentioned problems, and provides an induction heating cooker that is capable of suppressing a reduction in the heating efficiency and an increase of leakage flux in the case where a heating target is moved when heating operation is being performed.
  • an induction heating cooker that is capable of reducing the occurrence of uneven heating in the case where a heating target is moved after heating starts.
  • An induction heating cooker includes 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; control means for performing individual drive control of each of the inverter circuits; and load determining means for performing a load determination as to whether, on a basis of the output current and the input power or the output power of an inverter circuit of the inverter circuits that is being driven, a heating target is placed above a corresponding heating coil of the heating coils, wherein the control means, during performance of a heating operation for applying set power to a heating target, controls, on a basis of a determination result by the load determining means, an inverter circuit of the inverter circuits to output power corresponding to the set power to a heating coil of the heating coils above which a heating target is placed, and controls
  • a specific power that is smaller than or equal to set power is output to the heating coil.
  • 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 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 on the top plate 101. 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 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 (or inverter circuit 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 driving 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 pan or the like, which is a heating target, 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").
  • the load determining means 26 performs a load determination as to whether or not unsuitable 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.
  • unsuitable load refers to a load that is not suitable for induction heating, such as, low-resistance pans including aluminum pans that are made of a low-efficiency material and that cannot be induction heated or small items including forks and spoons that should not be heated.
  • suitable load refers to a load that is suitable for being induction heated and includes objects to be heated other than unsuitable load.
  • 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 have 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 degrees), 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 is a diagram illustrating an example of the positional relationship between heating coils and a load (pan) to be heated in the induction heating cooker according to Embodiment 1.
  • 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.
  • FIG. 5 the case will be explained by way of example, in which with respect to one heating port 106, nine heating coils 22 are arranged in such a manner that three heating coils 22 are arranged in a lateral direction and three heating coils 22 are arranged in a depth direction.
  • the heating coil 22 arranged in the central part 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 peripheral heating coils (1 ⁇ n).
  • the control means 25 causes a specific high-frequency current (specific frequency) to be supplied to the individual heating coils 22 at the time when heating starts.
  • the load determining means 26 acquires an output current detected by the output current detecting means 28 and input current detected by the input current detecting means 6. 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 a pan is placed above each of the heating coils 22 and whether or not the placed pan is an unsuitable load.
  • the output of the inverter circuit 9 is limited to a specific power.
  • the specific power is a value that is smaller than or equal to power corresponding to the set power and is, for example, a lower limit value of power that the inverter circuit 9 can output.
  • the specific power is referred to as a limited output
  • the state where the output of the inverter circuit 9 is limited to the specific power is referred to as an output limited state.
  • the output of the inverter circuit 9 is controlled to power corresponding to set power (feedback control). That is, the output of the inverter circuit 9 is controlled to be within a range from the lower limit value to the upper limit value, in accordance with set power.
  • the load determining means 26 determines that a suitable load is placed above the central heating coil 22a, the peripheral heating coils 22b-5, 22b-7, and 22b-8, and determines that no pan is placed above the peripheral heating coils 22b-1 to 22b-4 and 22b-6.
  • control means 25 controls output of the inverter circuit 9a for the central heating coil 22a and the inverter circuits 9b-5, 9b-7, and 9b-8 for the peripheral heating coils 22b-5, 22b-7, and 22b-8 above which a suitable load is placed, in accordance with set power. Furthermore, the control means 25 controls the output of the inverter circuits 9b-1 to 9b-4 and 9b-6 for the peripheral heating coils 22b-1 to 22b-4 and 22b-6 for which no pan is placed to a limited output.
  • a load determination is performed at the time when heating starts, and a heating operation for applying set power to a pan by the heating coils 22 above which the pan is placed. Furthermore, by controlling the output of the heating coils 22 above which the pan is not placed to a limited output, which is for example, a lower limit value, a reduction in the heating efficiency and leakage flux can be suppressed.
  • the output of the inverter circuits 9 may be set in accordance with the resistance of the load circuits 24 calculated on the basis of input current and output current.
  • Fig. 7 One such example will be explained with reference to Fig. 7 .
  • Fig. 7 is a diagram illustrating the load state and a driving signal control range for an inverter circuit in the induction heating cooker according to Embodiment 1.
  • the lateral axis represents the resistance of a load circuit 24 calculated on the basis of input current and output current of an inverter circuit 9, and the vertical axis represents the magnitude of output (level of a driving signal) of the inverter circuit 9.
  • eddy current flows to the pan due to an output current flowing to the heating coil 22.
  • the pan is caused to be heated, and power is consumed.
  • the eddy current flowing to the pan depends on (substantially proportional to) the degree of magnetic coupling between the heating coil 22 and the pan and the output current flowing to the heating coil 22.
  • the power consumed for the pan is that generated by the eddy current flowing to the pan; is approximately the same as that obtained by multiplying the square of the output current flowing to the heating coil 22 with a load resistance; and is substantially proportional to the input power (input current).
  • a load determination is performed using the resistance obtained on the basis of the input current (equivalent to power) and the output current.
  • the output of the inverter circuit 9 is controlled to be power corresponding to set power (feedback control). That is, the output of the inverter circuit 9 is controlled within a range from the lower limit value to the upper limit value in accordance with set power.
  • the output of the inverter circuit 9 is controlled to a limited power, which is for example, a lower limit value.
  • the resistance is a value that is smaller than the limited output range, it is determined that unsuitable load whose output current is excessive, such as a nonmagnetic pan made of aluminum or the like, is placed, and the driving of the inverter circuit 9 is stopped.
  • Fig. 8 is a diagram illustrating determining conditions for a load state when heating operation is being performed in the induction heating cooker according to Embodiment 1.
  • Fig. 9 is a diagram illustrating an example of detecting conditions for load to be heated in a driving signal limited state in the induction heating cooker according to Embodiment 1.
  • control means 25 acquires an output current detected by the output current detecting means 28 of an inverter circuit 9 being driven and an input current detected by the input current detecting means 6.
  • the load determining means 26 determines, by referring to, for example, information illustrated in Fig. 8 , whether or not a pan is placed above a heating coil that is controlled to output power corresponding to set power (feedback control) and whether or not the placed pan is unsuitable load.
  • the load determining means 26 determines, by referring to, for example, information illustrated in Fig. 9 , whether or not a pan is placed above a heating coil that is outputting a limited output and whether or not the placed pan is unsuitable load.
  • the peripheral heating coils 22b-5 and 22b-8 which are under feedback control, change from the state where a pan is placed to the state where no pan is placed.
  • the values of the output current and the input current of the peripheral heating coils 22b-5 and 22b-8 that are outputting power corresponding to set power are moved from a region where a suitable load is present (pan is present) to a region where the load is absent (pan is absent).
  • the load determining means 26 determines that the peripheral heating coils 22b-5 and 22b-8 are in the state where no pan is placed.
  • the control means 25 controls the output of the inverter circuits 9b-5 and 9b-8 for peripheral heating coils for the peripheral heating coils 22b-5 and 22b-8 above which no pan is placed to a limited output.
  • the peripheral heating coils 22b-4 and 22b-6 change from the state where no pan is placed to the state where a pan is placed.
  • the values of the output current and the input current of the peripheral heating coils 22b-4 and 22b-6, which are set to a limited output are moved from the region of the output limited, state (absence of a pan) to the region of feedback control (presence of a pan).
  • the load determining means 26 determines that the peripheral heating coils 22b-4 and 22b-6 are in the state where a pan is placed.
  • the control means 25 controls the output of the inverter circuits 9b-4 and 9b-6 for the peripheral heating coils 22b-4 and 22b-6 above which a pan is placed to power corresponding to set power (recover feedback control).
  • the output of the inverter circuits 9 may be set in accordance with the resistance of the load circuits 24 calculated on the basis of input current and output current.
  • the output of the heating coil 22 is limited (for example, to a lower limit value).
  • a reduction in the heating efficiency is suppressed, and leakage flux is reduced.
  • 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, has been input, such as by setting of a heating power using the operating unit 104, (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, output current detected by the output current detecting means 28 and 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 pan is placed above the central heating coil 22a and whether the placed pan is suitable load or unsuitable load,. Then, the load determining means 26 sets (stores) a load determination result (S204).
  • the initial load determining process is terminated. Meanwhile, in the case where it is determined that 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 a 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 inverter circuits for peripheral heating coils 9b for peripheral heating coils other than peripheral heating coils 22b for which it is determined that unsuitable load is placed above the peripheral heating coils 22b in step S200, and sets the output to limited power (lower limit value) (S103).
  • peripheral heating coils 22b in the state where no pan (no load) is placed and peripheral heating coils 22b above which a suitable load is placed are driven at a limited output.
  • 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 (for example, Fig. 8 ), whether or not 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 S901.
  • 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 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 in which an 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 peripheral heating coil n.
  • Fig. 12 is a flowchart illustrating an output control process for an inverter circuit for a peripheral heating coil n by the control means in the induction heating cooker according to Embodiment 1.
  • the control means 25 determines whether the output state of an inverter circuit 9b-n for peripheral heating coil n is a state where driving is stopped (hereinafter, referred to as an output stop state), a controlled state where a power corresponding to set power is set (hereinafter, referred to as a normal output state), or an output limited state (S301).
  • step S301 In the case where it is determined in step S301 that it is in the output stop state, 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, an output current detected by the output current detecting means 28 and an input current detected by the input current detecting means 6. Then, as described above, the load determining means 26 determines, on the basis of the acquired output current and input current and heating permission/inhibition conditions (for example, Fig. 8 ), whether a pan is placed above the peripheral heating coil n and whether the placed pan is a suitable load or an unsuitable load (S302).
  • step S302 In the case of an unsuitable pan (step S302; unsuitable load is present), the driving of the inverter circuit 9b-n for the peripheral heating coil n is stopped (S303), and the output processing for the peripheral heating coil n is terminated.
  • step S302 In the case where no pan is placed (step S302; load is absent), the driving of the inverter circuit 9b-n for the peripheral heating coil n is set to the output limited state (S304), and then the output processing for the peripheral heating coil n is terminated. Accordingly, in the case where a pan is not positioned above a peripheral heating coil n by moving the pan or the like, output to the peripheral heating coil n is limited to a specific power, and a reduction in the heating efficiency and an increase of leakage flux can thus be suppressed.
  • control means 25 compares the output current of the central heating coil 22a with the output current of the peripheral heating coil n (S305).
  • step S305 it is determined whether the phase difference between the arms of the inverter circuit 9b-n for peripheral heating coil n is smaller than the upper limit (180 degrees (half cycle) (S306).
  • control means 25 increases the phase difference between the arms of the inverter circuit 9b-n for peripheral heating coil n (S307), and terminates the output processing for the peripheral heating coil n.
  • step S305; ⁇ it is determined whether the phase difference between the arms of the inverter circuit 9b-n for peripheral heating coil n is greater than a lower limit value (S308).
  • the lower limit value 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 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 peripheral heating coil n (S309), and terminates the output processing for the peripheral heating coil n.
  • step S305 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 S305; ⁇ ), 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, an output current detected by the output current detecting means 28 and an input current detected by the input current detecting means 6. Then, as described above, the load determining means 26 determines, on the basis of the acquired input current and output current and heating permission/inhibition conditions (for example, Fig. 9 ), whether or not a pan is placed above the peripheral heating coil n and whether the placed pan is a suitable load or an unsuitable load, (S310).
  • step S310 In the case of an unsuitable pan (step S310; unsuitable load is present), the driving of the inverter circuit 9b-n for the peripheral heating coil n is stopped (S311), and the output processing for the peripheral heating coil n is terminated.
  • step S310 In the case where no pan is placed (step S310; load is absent), the output processing for the peripheral heating coil n is terminated.
  • step S310 the driving of the inverter circuit 9b-n for the peripheral heating coil n is set to the normal output state, and then the output processing for the peripheral heating coil n is terminated. Accordingly, in the case where a pan is placed above a peripheral heating coil n by moving the pan or the like, output to the peripheral heating coil n is set to an output corresponding to set power, and the occurrence of uneven heating can thus be reduced.
  • 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 heating coil 22 above which a pan is not placed may be set to the output limited state and the heating coil 22 above which a pan is placed may be set to the normal output state, without distinction of the central heating coil 22a and a peripheral heating coil n from each other.
  • the load determining means 26 may only determine whether or not a pan is placed and perform setting for the normal output state and the output limited state.
  • heating output is controlled on the basis of the phase difference between arms of an inverter circuit 9
  • the present invention is not limited to this.
  • the heating output may be controlled by changing the duty ratio of the output voltage of the inverter circuit 9.
  • a specific power (limited power) is output to a heating coil 22 above which the heating target is not placed, on the basis of a determination result by the load determining means 26, and in the case where the heating target is placed above the heating coil 22, power corresponding to the set power is output to the heating coil 22.
  • heating target in the case where the heating target (load) is moved to a position above the heating coil 22 above which no object to be heated is placed, heating can be performed with an output corresponding to the set power by the heating coil 22.
  • the load determining means 26 performs a load determination on the basis of the output current and the input current (input power or output power) of an inverter circuit 9 that is operating in the output limited state, the load determining means 26 is capable of promptly determining that a heating target is placed above the heating coil 22 in the output limited state.
  • a specific power in the output limited state is set to, for example, a lower limit value of power that the inverter circuits 9 can output.
  • the loss caused by high-frequency current flowing to a heating coil 22 above which a heating target (load) is not placed and leakage flux from the heating coil 22 can be reduced as much as possible.
  • Embodiment 2 a form in which the inverter circuits 9 each have a half-bridge configuration will be explained.
  • Fig. 13 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 between the switching element on the higher potential side and the switching element on the lower potential side and one end of the direct-current bus, and the control means 25 supplies the high-frequency voltage to the load circuit 24'.
  • Fig. 14 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. 15 is a flowchart illustrating a heating control process by the control means in the induction heating cooker according to Embodiment 2.
  • Fig. 16 is a flowchart illustrating an output control process for an inverter circuit for 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 coils (1 ⁇ n).
  • 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 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 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 S305 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 S305 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 S305 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 S305 (step S305; ⁇ ), 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 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 may be provided.
  • Embodiments 1 and 2 are directed to the case where the plurality of heating coils 22 include the central heating coil 22a arranged in the central part of each of the heating ports 106 arranged on the top plate 101 and the plurality of peripheral heating coils 22b arranged in each of the lateral direction and the depth direction of the central heating coil 22a, the present invention is not limited to this.
  • the plurality of heating coils 22 may include a central heating coil 22a arranged in the central part 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 22a' arranged in the central part of each of the heating ports 106 arranged on the top plate 101 and an outer heating coil 22b' wound so as to surround the inner heating coil 22a'.
  • the central heating coil 22a in the operation explanation described above corresponds to the inner heating coil 22a' and the peripheral heating coil 22b corresponds to the outer heating coil 22b'.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)
EP12746467.5A 2011-02-14 2012-01-11 Inductive heating cooker Not-in-force EP2661152B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011028159 2011-02-14
PCT/JP2012/000109 WO2012111244A1 (ja) 2011-02-14 2012-01-11 誘導加熱調理器

Publications (3)

Publication Number Publication Date
EP2661152A1 EP2661152A1 (en) 2013-11-06
EP2661152A4 EP2661152A4 (en) 2017-01-04
EP2661152B1 true EP2661152B1 (en) 2017-10-11

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EP12746467.5A Not-in-force EP2661152B1 (en) 2011-02-14 2012-01-11 Inductive heating cooker

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EP (1) EP2661152B1 (zh)
JP (1) JP5599479B2 (zh)
CN (1) CN103348765B (zh)
ES (1) ES2646216T3 (zh)
WO (1) WO2012111244A1 (zh)

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EP2709422B2 (de) * 2012-09-13 2023-08-30 BSH Hausgeräte GmbH Kochfeldvorrichtung
EP2708818B1 (de) * 2012-09-13 2021-04-14 BSH Hausgeräte GmbH Kochfeldvorrichtung
EP2709423B1 (de) * 2012-09-13 2017-05-10 BSH Hausgeräte GmbH Kochfeldvorrichtung
JP6076040B2 (ja) * 2012-10-31 2017-02-08 三菱電機株式会社 誘導加熱調理器
JP6029510B2 (ja) * 2013-03-27 2016-11-24 三菱電機株式会社 誘導加熱調理器、及び電力管理システム
JP6057948B2 (ja) * 2014-06-16 2017-01-11 三菱電機株式会社 誘導加熱調理器、および電力管理システム
WO2016065558A1 (zh) * 2014-10-29 2016-05-06 深圳拓邦股份有限公司 用于感应加热的半桥电路及电磁灶系统
TR201809520T4 (tr) 2015-12-18 2018-07-23 Ego Elektro Geraetebau Gmbh Isıtma devresi ve endüksiyonlu pişirme ocağı.
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JP6723432B2 (ja) * 2017-03-24 2020-07-15 三菱電機株式会社 誘導加熱調理器
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Publication number Publication date
JPWO2012111244A1 (ja) 2014-07-03
WO2012111244A1 (ja) 2012-08-23
CN103348765B (zh) 2015-09-16
EP2661152A1 (en) 2013-11-06
CN103348765A (zh) 2013-10-09
JP5599479B2 (ja) 2014-10-01
ES2646216T3 (es) 2017-12-12
EP2661152A4 (en) 2017-01-04

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