JP6124957B2 - Induction heating cooker - Google Patents

Description

  The present invention relates to an induction heating cooker having a function of performing wireless communication with an external device.

  Conventionally, in induction heating cookers, the user selects and outputs the input heating power (input power) and cooking menu (water heater mode, fried food mode) by operating the operation unit installed in the main body of the induction heating cooker. Control is performed. In order to improve convenience, a technology has been developed that automatically controls the output of the induction heating cooker by remote control using an external device by wireless communication or by cooperation with other home appliances by wireless communication (for example, Patent Document 1). Patent Document 1 discloses a method in which a smartphone is used as an external device for an input power operation of an induction heating cooker.

  The induction heating cooker generates high-frequency magnetic flux with a heating coil disposed below the top plate and performs heating. At this time, a leakage magnetic flux is generated from the heating coil. Therefore, when performing wireless communication with an external device, the leakage magnetic flux may interfere with a wireless signal communicating with the external device, and wireless communication may be hindered. Therefore, various methods have been proposed to ensure communication with external devices (see, for example, Patent Documents 2-4).

  In Patent Document 2, assuming that the home appliance is operated using wireless communication by an external device, noise generated in the home appliance itself interferes with the radio signal, and when an erroneous control signal is received, A method for preventing the execution of this control is described. According to this, the S / N ratio for the radio signal is calculated on the basis of the noise radiated by the own device, and when the S / N ratio is equal to or lower than the predetermined S / N ratio, the control by the wireless communication from the external device is discarded. By performing the above, erroneous control is prevented from being executed.

  Patent Document 3 describes a method for remotely operating a home appliance even when the communication is unstable in the operation of the home appliance using wireless communication. Then, after the external device receives the control signal, the external device requests the home appliance to transmit a response signal. According to this, when the response signal cannot be received before a predetermined time elapses, the communication becomes unstable by causing the home appliance to execute a preset operation. Even so, home appliances can be remotely controlled.

  Patent Document 4 discloses an electric device that eliminates a communication abnormality by executing an initialization process (restart) in the home appliance or the communication adapter when an abnormality occurs in the communication between the home appliance and the communication adapter. Has been.

JP 2014-202407 A JP 2012-235215 A International Publication No. 2014/175438 Japanese Patent No. 4217602

  However, in the methods of Patent Documents 2 and 3, in a situation where noise interferes with a radio signal, a control signal for remotely operating an electric home appliance by an external device is discarded or changed to a preset control. Therefore, the desired control by the external device cannot be executed. Similarly, in Patent Document 4, since initialization processing (restart) is performed in a home appliance or the like, desired control by an external device cannot be executed.

  The present invention has been made to solve the above-described problem, and provides an induction heating cooker that can suppress communication of leakage magnetic flux generated from a heating coil with a radio signal and perform communication more accurately. The purpose is to do.

  The induction heating cooker of the present invention includes a heating unit that heats an object to be heated, a drive circuit that supplies high-frequency power to the heating unit, a wireless communication unit that wirelessly communicates with an external device, and a heating power of the heating unit. An operation unit for setting, and a control device that controls high-frequency power supplied to the heating unit by the drive circuit based on an operation to the operation unit or a signal from the wireless communication unit. A communication state detection unit that detects a wireless communication period in which the unit wirelessly communicates with an external device, a command calculation unit that outputs a thermal power command based on an input to the operation unit or a control signal received by the wireless communication unit, When the drive circuit is controlled based on the thermal power command output from the command calculation unit and the communication state detection unit detects that it is in the wireless communication period, a limited power smaller than the high frequency power based on the thermal power command is supplied to the heating unit. So that the, and a drive control unit for controlling the drive circuit.

  According to the induction heating cooker of the present invention, the leakage magnetic flux generated in the heating coil communicates with an external device by supplying a limited power smaller than the high-frequency power based on the thermal power command to the heating unit during the wireless communication period. Interference with the radio signal to be performed can be suppressed, the quality of the radio signal with which the induction heating cooker communicates with the external device can be improved, and radio communication can be performed accurately.

It is a disassembled perspective view which shows the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a circuit diagram which shows an example of the drive circuit in the induction heating cooking appliance of FIG. 3 is a graph illustrating an example of a switching signal input to the drive circuit in FIG. 2. 3 is a graph showing another example of a switching signal input to the drive circuit of FIG. 2. It is a circuit diagram which shows another example of the drive circuit in the induction heating cooking appliance of FIG. 6 is a graph illustrating an example of a switching signal input to the drive circuit in FIG. 5. It is a block diagram which shows an example of the control apparatus in the induction heating cooking appliance of FIG. It is a graph which shows an example of the heating coil electric current supplied to a heating part from the drive circuit of FIG. It is a graph which shows another example of the heating coil electric current supplied to a heating part from the drive circuit of FIG. It is a flowchart which shows the operation example of the induction heating cooking appliance which concerns on Embodiment 1 of this invention. It is a block diagram which shows an example of the control part of the induction heating cooking appliance which concerns on Embodiment 2 of this invention. It is a flowchart which shows the operation example of the induction heating cooking appliance which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
Hereinafter, embodiments of the induction heating cooker of the present invention will be described with reference to the drawings. 1 is an exploded perspective view showing an induction heating cooker according to Embodiment 1 of the present invention. The induction heating cooker 100 of FIG. 1 has a main body B and a top plate 4 on which an object to be heated 5 such as a pan is placed. The top 4 is entirely composed of a material that transmits infrared rays, such as heat-resistant tempered glass or crystallized glass, and is fixed in a water-tight state between the outer periphery of the upper surface opening of the main body B via a rubber packing or a sealing material. Is done. The top plate 4 includes a first heating port 1, a second heating port 2, and a third heating port 3 as heating ports for induction heating of the object to be heated 5. In each of the heating ports 1 to 3, a circular pan position display indicating a rough placement position of the pan is formed by applying paint, printing, or the like.

  The induction heating cooker 100 includes a first heating unit 11, a second heating unit 12, and a third heating unit 13 corresponding to the heating ports 1 to 3. The first heating unit 11, the second heating unit 12, and the third heating unit 13 are each provided inside the main body B and below the top plate 4, and each heating unit is a heating coil (see FIG. (Not shown). The heating coil has a substantially circular planar shape, and is configured by winding a conductive wire made of an arbitrary metal with an insulating film (for example, copper, aluminum, etc.) in the circumferential direction, and high-frequency power is supplied to each heating coil. Thus, an induction heating operation is performed. And each heating part 11-13 induction-heats the to-be-heated material 5 mounted in each heating port 1-3.

  The first heating unit 11 and the second heating unit 12 are provided side by side on the front side of the main body B, and the third heating unit 13 is provided at substantially the center on the back side of the main body B. In addition, arrangement | positioning of each heating port 1-3 is not restricted to this, For example, you may arrange | position three heating ports 1-3 side by side in the substantially linear form. Moreover, you may arrange | position so that the position of the depth direction of the center of the 1st heating part 11 and the center of the 2nd heating part 12 may differ. Moreover, although the three heating parts 11-13 are provided in FIG. 1, at least 1 or more should just be provided.

  On the top plate 4, operation units 40 a to 40 c for setting an input heating power (input electric power) or a cooking menu (a water heating mode, a fried food mode, etc.) when heating the object to be heated 5 are the first heating unit 11. The second heating unit 12 and the third heating unit 13 are provided respectively. In addition, the top plate 4 has, as notification means, an operating state of the induction heating cooker 100, input contents / control contents from the operation units 40a to 40c and the external device 200, information regarding the external device 200 during wireless communication, wireless communication Display portions 41 a to 41 c for displaying the presence or absence of the light are provided for each of the first heating unit 11, the second heating unit 12, and the third heating unit 13.

  In addition, although the operation parts 40a-40c and the display parts 41a-41c are illustrated in FIG. 1 about the case where each heating port 1-3 is provided, the several heating ports 1-3 are collectively shown as 1. One operation unit and a display unit may be provided. In addition, the operation units 40a to 40c and the display units 41a to 41c may be provided separately, or may be provided integrally with a touch panel or the like, for example.

  The induction heating cooker 100 includes a driving circuit 50 that supplies high-frequency power to the heating coils of the first heating unit 11, the second heating unit 12, and the third heating unit 13, and the induction heating cooking including the driving circuit 50. And a control device 45 for controlling the operation of the entire device 100.

  FIG. 2 is a circuit diagram showing an example of the drive circuit 50 in the induction heating cooker 100 of FIG. 2 illustrates the drive circuit 50 corresponding to the heating unit 11, the drive circuit 50 is provided for each of the heating units 11 to 13. In this case, the circuit configuration of each drive circuit 50 may be the same, or may be changed for each heating unit 11-13. As shown in FIG. 2, the drive circuit 50 includes a DC power supply circuit 22, an inverter circuit 23, and a resonance capacitor 24a.

  The DC power supply circuit 22 includes a diode bridge 22a, a reactor 22b, and a smoothing capacitor 22c, converts an AC voltage input from the AC power supply 21 into a DC voltage, and outputs the DC voltage to the inverter circuit 23.

  The inverter circuit 23 is a so-called half-bridge type inverter in which switching elements 23a and 23b are connected in series to the output of the DC power supply circuit 22, and diodes 23c and 23d as flywheel diodes are in parallel with the switching elements 23a and 23b, respectively. It is connected to the. The inverter circuit 23 converts the DC power output from the DC power supply circuit 22 into a high-frequency AC power of about 20 kHz to 80 kHz, and supplies the AC power to a resonance circuit including the heating unit 11 and the resonance capacitor 24a.

  The resonance capacitor 24a is connected in series to the heating unit 11, and this resonance circuit has a resonance frequency according to the inductance of the heating unit 11, the capacity of the resonance capacitor 24a, and the like. The inductance of the heating unit 11 changes according to the characteristics of the metal load when the object to be heated 5 (metal load) is magnetically coupled, and the resonance frequency of the resonance circuit changes according to the change in inductance.

  A high frequency current of about several tens of A flows through the heating unit 11, and the object to be heated 5 placed on the top plate 4 immediately above the heating unit 11 is induction-heated by a high frequency magnetic flux generated by the flowing high frequency current. The switching elements 23a and 23b are made of, for example, a silicon-based semiconductor such as IGBT, but may be configured using a wide band gap semiconductor such as silicon carbide or a gallium nitride-based material. By using a wide bandgap semiconductor for the switching elements 23a and 23b, the conduction loss of the switching elements 23a and 23b can be reduced. Further, since the heat radiation of the drive circuit 50 is good even when the switching frequency (drive frequency) becomes high (high speed), the heat radiation fins of the drive circuit 50 can be reduced in size, and the drive circuit 50 can be downsized and reduced. Cost reduction can be realized.

  For example, the input current detection unit 25 a detects a current input from the AC power supply (commercial power supply) 21 to the DC power supply circuit 22 and outputs a voltage signal corresponding to the input current value to the control device 45. The coil current detection means 25b is connected to a resonance circuit composed of the heating unit 11 and the resonance capacitor 24a. For example, the coil current detection unit 25 b detects a current flowing through the heating unit 11 and outputs a voltage signal corresponding to the heating coil current value to the control device 45.

  FIG. 3 is a graph showing an example of a switching signal input to the drive circuit of FIG. As shown in FIG. 3, the switching elements 23a and 23b are turned on / off at a repetition cycle called a switching cycle. The on-time and off-time are each half the switching period, and the switching elements 23a and 23b are turned on at the same time because they have a phase difference of 180 °. When the switching cycle is shortened, the switching frequency that is the reciprocal of the switching cycle increases, and the impedance of the heating unit 11 increases. For this reason, the high frequency current which the drive circuit 50 supplies becomes small, and high frequency electric power is suppressed. On the other hand, when the switching period is increased, the switching frequency is decreased and the impedance of the heating unit 11 is decreased. For this reason, the high-frequency current supplied from the drive circuit 50 increases, and the high-frequency power increases.

  The above control method is called switching frequency control because the high frequency power is controlled by the height of the switching frequency. When the switching elements 23a and 23b are simultaneously turned on, the inverter circuit 23 is short-circuited. Therefore, in the actual circuit, a period (dead time) in which both the switching elements 23a and 23b are turned off is provided. Shorter than time, the off time is longer than half of the switching period.

  FIG. 4 is a graph showing another example of the switching signal input to the drive circuit of FIG. As shown in FIG. 4, the switching elements 23a and 23b are turned on / off in a repetition cycle called a switching cycle. The on-time is shorter than half of the switching cycle, and the switching elements 23a and 23b are turned on at the same time because there is a phase difference of 180 °. When both the switching elements 23a and 23b are off, the inverter circuit 23 does not output power. Therefore, if the on-time is shortened, the high-frequency current supplied by the drive circuit 50 is reduced and the high-frequency power is suppressed. The ratio of the on-time to the switching period is called a duty ratio, and the above control method is called duty ratio control because high-frequency power is controlled by the duty ratio.

  FIG. 5 is a circuit diagram showing another example of the drive circuit 50A in the induction heating cooker 100 of FIG. In the drive circuit 50A shown in FIG. 5, parts having the same configuration as that of the drive circuit 50 shown in FIG. The drive circuit 50A of FIG. 5 is configured by a so-called full-bridge type inverter in which switching elements 23e and 23f and diodes 23g and 23h as flywheel diodes are additionally connected to the inverter circuit 23 of FIG. . Similarly to FIG. 2, the inverter circuit 23 converts the DC power output from the DC power supply circuit 22 into high-frequency AC power of about 20 kHz to 80 kHz, and supplies the AC power to the resonance circuit including the heating unit 11 and the resonance capacitor 24a.

  FIG. 6 is a graph showing an example of a switching signal input to the drive circuit of FIG. As shown in FIG. 6, the switching elements 23a, 23b, 23e, and 23f are turned on and off at a repetition period called a switching period. The on-time and off-time are each half of the switching period, and the switching elements 23a and 23b are turned on at the same time because there is a phase difference of 180 °. Since the IGBTs 23e and 23f also have a 180 ° phase difference in the turn-on timing, they are not turned on at the same time. The inverter circuit 23 supplies power during a period in which both the switching elements 23a and 23f or the switching elements 23b and 23e are on.

  By providing a phase difference at the timing when the switching elements 23a and 23e are turned on, a period during which both the switching elements 23a and 23f or the switching elements 23b and 23e are turned on is determined, and the power supplied by the inverter circuit 23 is controlled. The above control method is called phase control because high-frequency power is controlled by the phase difference. Note that when the switching elements 23a, 23b, or 23e, 23f are simultaneously turned on, the inverter circuit 23 is short-circuited. Therefore, in an actual circuit, a period (dead time) in which both the switching elements 23a, 23b and 23e, 23f are turned off is provided. Therefore, the on-time is shorter than half of the switching period, and the off-time is longer than half of the switching period.

  The drive circuit 50 is not limited to the examples shown in FIGS. 2 and 5 as long as it supplies high-frequency power to the heating unit 11. For example, a known technique such as a circuit system such as a one-stone voltage resonance circuit is used. Can be applied. Similar to the inverter circuit 23 of FIG. 2, the monolithic voltage resonance circuit converts the DC power output from the DC power supply circuit 22 into a high-frequency AC power of about 20 kHz to 80 kHz, and is composed of a heating unit 11 and a resonance capacitor 24a. Supply to the circuit.

  Here, the control device 45 generates high-frequency power that the drive circuit 50 supplies to the heating unit 11 in response to signals given from the input current detection unit 25a, the coil current detection unit 25b, the operation unit 40a, and the wireless communication unit 6. Send a signal to control. In addition, the control device 45 transmits a control signal for notifying the operation state of the induction heating cooker 100, the input content / control content from the operation unit 40 a and the external device 200, to the wireless communication unit 6.

  The wireless communication unit 6 performs wireless communication with the external device 200 and can transmit and receive wireless signals. Specifically, the control signal given from the control device 45 can be transmitted to the external device 200 by wireless communication. Alternatively, a control signal received from the external device 200 by wireless communication can be transmitted to the control device 45. Alternatively, both of these operations can be performed.

  The wireless communication unit 6 is connected to the control device 45 by wiring. However, the longer the wiring, the more susceptible to noise, so the wireless communication unit 6 and the control device 45 are arranged close to each other, and the wireless communication unit 6 is controlled. It is desirable to shorten the wiring connecting the device 45. The wireless communication unit 6 has an antenna unit for transmitting and receiving a radio signal therein, and it is desirable to arrange the antenna unit to be directly below the top plate 4 in order to facilitate transmission and reception of a radio signal.

  The external device 200 is a device capable of wireless communication such as a smartphone, and the heating power (input power) and the cooking menu (water heating mode, hot water mode when the induction heating cooker 100 heats the object to be heated 5 by wireless communication. It has a function of transmitting a control signal for setting a fried food mode and the like. Or it has a function which receives and displays the control signal which alert | reports the operation state of the induction heating cooking appliance 100, the operation parts 40a-40c, and the input content from the external apparatus 200, the control content. Or it has both of these functions.

  FIG. 7 is a block diagram illustrating an example of the control device 45 in the induction heating cooker 100 of FIG. 1, and the control device 45 will be described with reference to FIG. In addition, in FIG. 7, although illustrated about the case where the control apparatus 45 controls the 1st heating part 11, it is the same as that of the 1st heating part 11 also about the 2nd heating part 12 and the 3rd heating part 13. Are controlled respectively. The control device 45 controls the operation of the induction heating cooker 100 as a whole, and in the wireless communication period in which the external device 200 performs wireless communication with the wireless communication unit 6 that performs wireless communication with the external device 200, the drive circuit 50. Performs control to vary the high-frequency power supplied by.

  The command calculation unit 45a sets the heating power of the heating unit 11 and outputs a heating power command in accordance with an operation to the operation unit 40a or a control signal received by the wireless communication unit 6. For example, when the heating power of the heating unit 11 is set in the operation unit 40a or the external device 200, the command calculation unit 45a outputs a thermal power command based on the set thermal power. For example, when a predetermined cooking mode is set in the operation unit 40a or the external device 200, the command calculation unit 45a outputs a different thermal power command for each process of the cooking mode according to the setting content of the cooking mode. For example, in the deep-fried food mode, the command calculation unit 45a outputs a thermal power command for high thermal power in the heat retention process, and outputs a thermal power command for low thermal power in the preheating process after the thermal insulation process.

  The communication state detection unit 45 b detects a wireless communication period during which wireless communication with the external device 200 is performed in the wireless communication unit 6. That is, the communication state detection unit 45b determines whether the wireless communication unit 6 is performing wireless communication with the external device 200, and the wireless communication unit 6 performs wireless communication with the external device 200. Is detected as a wireless communication period.

  The drive control unit 45c controls the heating power in the heating unit 11 by controlling the operation of the drive circuit 50. The drive control unit 45c supplies a high-frequency power from the drive circuit 50 to the heating unit 11 by outputting a switching signal (see FIGS. 3, 4, and 6) according to the thermal power command to the drive circuit 50. . The drive control unit 45c performs control of the frequency of the switching signal, control of the on-duty ratio, or phase control based on the thermal power command output from the command calculation unit 45a, and outputs it to the drive circuit 50.

  Further, the drive control unit 45c has a function of controlling the drive circuit 50 so that when the communication state detection unit 45b detects a wireless communication period, a heating operation is performed with the limited power LP smaller than the high frequency power P of the thermal power command. Have. The drive control unit 45c stores a preset limit power LP, and the limit power LP is set to such a magnitude that leakage magnetic flux from the heating unit 11 (heating coil) does not affect wireless communication. ing. The drive control unit 45c compares the high frequency power P with the limited power LP. When the high frequency power P is smaller than the limited power LP, the drive control unit 45c does not change to the limited power LP but continues to supply the high frequency power P. Control. Thereby, the heating according to a user's intention can be continued.

  FIG. 8 is a graph showing an example of the heating coil current supplied from the drive circuit of FIG. 7 to the heating unit. As shown in FIG. 8, during the wireless idle period in which wireless communication is not performed, the drive control unit 45 c performs control so that the high-frequency power P based on the thermal power command from the command calculation unit 45 a is output to the heating unit 11. On the other hand, in the wireless communication period, the drive control unit 45c controls to supply the limited power LP smaller than the high frequency power P based on the thermal power command, and suppresses the high frequency power supplied by the drive circuit 50. Thereby, the leakage magnetic flux which generate | occur | produces in the heating part 11 can be decreased, and interference of the leakage magnetic flux which generate | occur | produces in the heating part 11 with respect to a radio signal can be suppressed. Furthermore, since the heating to the heated object 5 is continued, the influence of the heated object 5 on cooking can be minimized.

  FIG. 9 is a graph showing another example of the heating coil current supplied to the heating unit 11 from the drive circuit 50 of FIG. As shown in FIG. 9, the drive control unit 45c stops the high-frequency power supplied by the drive circuit 50 during the wireless communication period (limited power LP = 0). Thus, since the leakage magnetic flux which generate | occur | produces in the heating part 11 can be eliminated, interference of the leakage magnetic flux which generate | occur | produces in the heating part 11 with a radio signal can be prevented reliably.

  In addition, when a plurality of heating units 11 to 13 are provided as shown in FIG. 1 and a plurality of heating coils are operating at the same time, a part or all of the heating units 11 are included in the drive circuit 50 during the wireless communication period. Is controlled so as to be supplied with the limited power LP. Thereby, the leakage magnetic flux which generate | occur | produces in the one part or all the heating part 11 decreases, and interference of the leakage magnetic flux which generate | occur | produces in the several heating parts 11-13 to a radio signal can be suppressed. At this time, the drive control unit 45c may perform control so that the sum of leakage magnetic fluxes from the plurality of heating units 11 to 13 does not affect wireless communication. For example, in the drive control unit 45c, different limiting power LP is set for each of the number of heating units 11 to 13 being driven, and the drive control unit 45c is in accordance with the heating units 11 to 13 being driven, You may make it set the limiting electric power LP supplied to each heating part 11-13.

  FIG. 10 is a flowchart showing an operation example of induction heating cooker 100 according to Embodiment 1 of the present invention, and an operation example of induction heating cooker 100 will be described with reference to FIGS. 1 to 10. In addition, in FIG. 10, the case where the drive of the heating part 11 is controlled is illustrated. First, when an operation is performed from the user to the operation unit 40a or the external device 200, a thermal power command is output from the command calculation unit 45a to the drive control unit 45c according to the content of the operation. Then, in the drive control part 45c, a switching signal is output to the drive circuit 50 based on a thermal power command, and the heating part 11 is driven by the drive circuit 50 (step S1).

  Thereafter, when a heating stop command is input from the user to the operation unit 40a or the external device 200 (YES in step S2), the heating operation by the drive circuit 50 is controlled to stop (step S3). On the other hand, when the heating stop command is not input (NO in step S2), the heating operation continues (step S4).

  When the heating operation is performed, the communication state detection unit 45b detects whether or not communication with the external device 200 is performed (step S5). When it is determined that wireless communication is not being executed (NO in step S5), the heating operation with the high-frequency power P based on the thermal power command is continued (steps S1 to S5). On the other hand, when the communication state detection unit 45b detects that wireless communication is being performed in the wireless communication unit 6 (YES in step S5), the drive control unit 45c has a limited power LP smaller than the high frequency power P based on the thermal power command. Control is performed so that heating is performed (see step S6, FIG. 8 and FIG. 9). Thereafter, heating by the limited power LP is continued until the wireless communication is suspended (steps S2 to S6). On the other hand, when it is detected in the communication state detection unit 45b that the wireless communication is completed (NO in step S5), the high frequency power based on the thermal power command is supplied to the heating unit 11 again (steps S1 to S6).

  According to the first embodiment, in the wireless communication period, the drive control unit 45c causes each heating unit 11-13 to have the limited power LP smaller than the high frequency power P based on the thermal power command. The leakage magnetic flux that is generated is prevented from interfering with a radio signal that communicates with the external device 200, the induction heating cooker 100 improves the quality of the radio signal that communicates with the external device 200, and accurately performs radio communication. Can do.

  That is, as in the conventional case, when the control signal for remotely operating the home appliance by the external device 200 is discarded or changed to a preset control, the desired control by the external device 200 is not executed. , It will be inconvenient for the user. Similarly, when initialization processing (restart) is performed in a home appliance or the like, cooking cannot be continuously performed, and convenience is deteriorated. On the other hand, in the induction heating cooker 100 of Embodiment 1, the leakage magnetic flux which generate | occur | produces in each heating part 11-13 by supplying the limiting electric power LP smaller than the high frequency electric power P based on a thermal power command in a radio | wireless communication period. Interference with a radio signal communicating with the external device 200 is suppressed. Therefore, even when the heating units 11 to 13 are being driven, wireless communication with the external device 200 can be performed more accurately, so that the operation desired by the user using the external device 200 can be performed more accurately. Can be executed.

  In particular, as shown in FIG. 8, the heating of the article 5 to be heated is ensured while ensuring the quality of communication by continuously supplying the limited power LP to the heating unit 11 even during the wireless communication period. The influence on the article to be heated 5 by being stopped can be minimized.

Embodiment 2. FIG.
FIG. 11 is a block diagram illustrating an example of the induction heating cooker according to Embodiment 2 of the present invention, and the induction heating cooker 100A will be described with reference to FIG. In addition, in the induction heating cooking appliance 100A of FIG. 11, the part which has the same structure as the induction heating cooking appliance 100 of Embodiment 1 of FIG. 7 is attached | subjected, and the description is abbreviate | omitted. The induction heating cooker 100A of FIG. 11 differs from the induction heating cooker 100 of FIG. 7 in that the limit power LP is increased or decreased based on the communication success rate.

  The communication state detection unit 145b of the control device 145 in FIG. 11 includes a success rate calculation unit 145x that calculates a communication success rate, which is a rate of communication success, in the wireless communication period. Here, various methods can be applied as a method for obtaining the communication success rate. For example, the success rate calculation unit 145x mutually confirms the success / failure of the wireless communication between the external device 200 and the wireless communication unit 6, and calculates the ratio of correctly transmitting / receiving the control signal. Alternatively, when the control signal is transmitted from the external device 200 at a fixed timing, the success rate calculation unit 145x calculates the rate at which the wireless communication unit 6 can correctly receive the control signal as the communication success rate.

  Alternatively, when a control signal is transmitted from the external device 200 to the wireless communication unit 6, a signal for confirming the content of the received control signal is transmitted from the wireless communication unit 6 to the external device 200. Then, the external device 200 transmits a signal regarding whether or not the control signal is correctly received by the wireless communication unit 6 from the received signal to the wireless communication unit 6 again. In this case, the success rate calculation unit 145x checks whether or not the control signal is correctly transmitted, and correctly calculates the ratio of the control signal as the communication success rate.

  Alternatively, when a control signal is transmitted from the wireless communication unit 6 to the external device 200, a signal for confirming the content of the received control signal is transmitted from the external device 200 to the wireless communication unit 6. Then, the success rate calculation unit 145x confirms whether or not the control signal is correctly received by the external device 200 from the signal received by the wireless communication unit 6, and uses the rate at which the control signal is correctly received as the communication success rate. calculate.

  In addition, there is a method in which the format of a control signal for wireless communication between the external device 200 and the wireless communication unit 6 is determined in advance, and is performed depending on whether or not the received control signal is in the correct format. The control signal that communicates between the external device 200 and the wireless communication unit 6 adds a sign that becomes a wireless communication success mark (flag) to at least the start and end points, and the success rate calculation unit 145x displays all the marks. The communication success rate is calculated depending on whether the control signal can be received.

  In addition, although the case where the communication success rate is calculated in the success rate calculation unit 145x on the control device 145 side is illustrated, the success rate calculation unit 145x may be provided on the wireless communication unit 6 side. In addition, the success rate calculation unit 145x may combine a plurality of communication success rate calculation methods described above. In this case, for example, an average value or a maximum value of a plurality of communication success rates may be compared with a reference value described later.

  The drive control unit 45c controls the drive circuit 50 so that the preset limited power LP is supplied at the start of the wireless communication period. Then, the drive control unit 45c compares the communication success rate calculated by the success rate calculation unit 145x with a preset reference value. When the communication success rate is equal to or higher than the reference value, the drive control unit 45c Assuming that there is no problem in the communication environment even if high-frequency power larger than LP is supplied, the current limit power LP is increased by the set increase amount ΔIP.

  On the other hand, when the communication success rate is smaller than the reference value, the drive control unit 45c reduces the current limit power LP by the set decrease amount ΔDP, assuming that the current limit power LP has a problem with the communication state. In this way, by varying the limit power LP based on the communication success rate indicating the actual communication environment state, the variable amount from the power based on the thermal power command is minimized while performing more accurate wireless communication. Can be suppressed.

  In addition, when wireless communication is intermittently executed with a specific external device 200, a command for the power to be supplied is made by setting the variable amount of power supplied when wireless communication is started as the variable amount at the end of the previous communication. The variable amount from the value can be reduced. Moreover, although the case where the drive control unit 45c determines increase / decrease of the limit power LP using one reference value is illustrated, a different reference value may be used. That is, the upper limit reference value and the lower limit reference value are stored, and the drive control unit 45c increases the limit power LP when larger than the upper limit reference value, and decreases the limit power LP when smaller than the lower limit reference value. If it is greater than or equal to the lower limit reference value and less than or equal to the upper limit reference value, the current limit power LP may be maintained.

  FIG. 12 is a flowchart showing an operation example of the induction heating cooker according to Embodiment 2 of the present invention. In the flowchart of FIG. 12, the same steps as those in the flowchart of Embodiment 1 in FIG. In FIG. 12, when it is detected that the wireless communication is performed in the communication state detection unit 45b (YES in step S5), heating is performed with the limited power LP smaller than the high frequency power P based on the thermal power command (step S11). ). At this time, the success rate calculation unit 145x calculates the communication success rate (step S12), and compares the communication success rate with the reference value (step S13).

  If the communication success rate is equal to or higher than the reference value (YES in step S13), the drive circuit 50 is controlled so that the limited power LP is increased by the set increase amount ΔIP (step S14). That is, the limited power LP is changed so that the variable amount from the high frequency power P based on the thermal power command becomes small, and the heating operation is continued. On the other hand, when the communication success rate is smaller than the reference value, the drive circuit 50 is controlled so that the limited power LP is reduced by the set decrease amount ΔDP (step S15). That is, the limited power LP is changed so that the variable amount from the high-frequency power P based on the thermal power command is large, and the heating operation is continued.

  Thereafter, until the wireless communication is suspended, the limit power LP is changed and heating by the limit power LP is performed (steps S2 to S15). On the other hand, in the communication state detection unit 45b, when it is detected that the wireless communication is completed and the wireless suspension period is detected (NO in step S5), the high frequency power P based on the thermal power command is supplied to the heating unit 11 again ( Steps S1-S6).

  According to the second embodiment, the magnitude of the limited power LP is increased / decreased based on the communication success rate, so that the degree of reduction in thermal power is minimized while suppressing interference with the radio communication signal. The influence on can be suppressed. In addition, by adopting the method for calculating the communication success rate described above, it is possible to accurately grasp the influence of leakage magnetic flux on the quality of communication and to perform wireless communication more accurately, while reducing the impact on convenience. can do.

  The embodiment of the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the first and second embodiments, the case where the external device 200 is a smartphone has been described. However, the present invention is not particularly limited thereto. For example, the external device 200 includes a remote control, a tablet terminal, other home appliances, a HEMS (Home Energy Management System) controller for controlling home appliances, Wi-fi (registered trademark), and Bluetooth (registered trademark). Any device having a wireless communication function such as the above may be used.

  DESCRIPTION OF SYMBOLS 1 1st heating port, 2nd heating port, 3rd heating port, 4 top plate, 5 to-be-heated object, 6 radio | wireless communication part, 11 1st heating part, 12 2nd heating part, 13 3rd heating part, 21 AC power supply, 22 DC power supply circuit, 22a Diode bridge, 22b Reactor, 22c Smoothing capacitor, 23 Inverter circuit, 23a, 23b, 23e, 23f Switching element, 23c, 23d, 23g, 23h Diode, 24a Resonance capacitor, 25a input current detection means, 25b coil current detection means, 40a, 40b, 40c operation section, 41a, 41b, 41c display section, 45, 145 control device, 45a command calculation section, 45b, 145b communication state detection section, 45c drive controller, 50, 50A drive circuit, 100, 100A induction heating cooker, 145x composition Utility ratio calculation unit, 200 external device, B main body, LP limit power, P high frequency power, ΔDP setting decrease amount, ΔIP setting increase amount.

Claims (10)

A heating unit for heating an object to be heated;
A drive circuit for supplying high-frequency power to the heating unit;
A wireless communication unit that wirelessly communicates with an external device;
An operation unit for setting the heating power of the heating unit;
A control device for controlling high-frequency power supplied to the heating unit by the drive circuit based on an operation to the operation unit or a signal from a wireless communication unit;
Have
The controller is
A communication state detection unit for detecting a wireless communication period in which the wireless communication unit is performing wireless communication with the external device;
A command calculation unit that outputs a thermal power command based on an input to the operation unit or a control signal received by the wireless communication unit;
While controlling the drive circuit based on a thermal power command output from the command calculation unit and detecting that the communication state detection unit is in a wireless communication period, the limited power smaller than the high frequency power based on the thermal power command is An induction heating cooker comprising: a drive control unit that controls the drive circuit so as to be supplied to the heating unit.   The induction heating cooker according to claim 1, wherein the drive control unit controls the drive circuit so that the preset power limit is supplied to the heating unit. The communication state detection unit includes a success rate calculation unit that calculates a communication success rate in which wireless communication is successful in the wireless communication period,
The induction heating cooking according to claim 1, wherein the drive control unit increases the power limit when the communication success rate is greater than a reference value, and decreases the power limit when the communication success rate is equal to or less than the reference value. vessel.   The success rate calculation unit confirms success or failure of wireless communication between the wireless communication unit and the external device in the wireless communication period, and calculates a communication success rate from the number of times wireless communication has been accurately performed. The induction heating cooker according to claim 3.   The success rate calculating unit calculates a communication success rate from the number of times that a control signal transmitted from the external device at a certain timing is accurately received by the wireless communication unit during the wireless communication period. The induction heating cooker according to 3 or 4. A plurality of the heating unit and the drive circuit are provided,
The induction heating cooker according to any one of claims 1 to 5, wherein the control device controls a plurality of the drive circuits.   The induction heating cooker according to any one of claims 1 to 6, wherein the wireless communication unit receives a control signal related to an input heating power of the induction heating cooker or an operation of a cooking menu from the external device by wireless communication.   The induction heating cooker according to any one of claims 1 to 7, wherein the wireless communication unit has a function of transmitting an operation state of the induction heating cooker to the external device using wireless communication. Operation state before Symbol heating unit, the input contents from the operation unit and the external device, any of the preceding claims, further comprising a display unit that displays the information about the external device whether or wireless communication, in a wireless communication The induction heating cooker of Claim 1.   The wireless communication unit performs wireless communication with the external device including any of an information terminal of a smartphone or a tablet, a remote controller, another household electrical appliance, or a power management device. The induction heating cooker described in 1.

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