Induction heating device and method for controlling induction heating device

Abstract

The present specification relates to an induction heating device and a method for controlling an induction heating device. An induction heating device according to an embodiment may comprise: a top plate on which a container is stably placed; a working coil; an inverter which includes a plurality of switching elements, and supplies current to the working coil; a driving circuit which supplies a switching signal to each switching element included in the inverter; and a controller which determines a driving frequency of the inverter, and supplies a control signal based on the driving frequency to the driving circuit so as to drive the working coil. In an embodiment, the controller may receive a load amount of a load inside the container, and adjust a power level of the working coil on the basis of the load amount.

Description

Induction heating device and control method of induction heating device

[0001] This specification relates to an induction heating device and a control method for the induction heating device.

[0002]

[0003] An induction heating device heats a metal container by generating eddy currents in the container through the magnetic field generated around the working coil. When the device is operated, an alternating current is applied to the working coil. This generates an induced magnetic field around the working coil, which is located within the device. When the magnetic field lines of the induced magnetic field pass through the bottom of the container, which contains a metal component placed above the working coil, an eddy current is generated within the bottom of the container. When the eddy current flows through the container, the container heats.

[0004] When a vessel is heated by an induction heating device, a certain amount of time is required for the load inside the vessel to boil. However, the time it takes for the load to reach the boiling point may vary depending on the type of vessel and the load.

[0005] Several technologies have been proposed to notify users when a load within a vessel heated by an induction heater has reached boiling point. Examples of these conventional technologies include probe-type temperature sensors for measuring the temperature of the load within the vessel. However, probe-type temperature sensors are complex to use, compromise the hygiene of the load within the vessel, and require frequent recharging.

[0006] Another example of a prior art is an induction heating device with a built-in vibration sensor that measures the vibration of the container as the load reaches its boiling point. However, the types of containers for which the induction heating device with a built-in vibration sensor can detect the boiling state of the load are very limited. This inconveniences the user by requiring them to individually check the type of container. Furthermore, if the user does not use an appropriate container, the boiling state of the load may not be detected at all.

[0007]

[0008] The purpose of this specification is to provide an induction heating device and a control method of the induction heating device that can accurately notify a user that a load inside a container has reached a boiling state through simple operation without degrading the hygiene of the load inside the container.

[0009] The purpose of this specification is to provide an induction heating device and a control method of the induction heating device that can accurately notify a user that a load inside a container has reached a boiling state without a separate sensor or component.

[0010] The purpose of this specification is to provide an induction heating device and a control method of the induction heating device that can accurately notify a user when a load inside a container has reached a boiling state for a wider variety of containers.

[0011] The purpose of this specification is to provide an induction heating device and a control method for the induction heating device that can maintain a load in a boiling state without increasing the temperature of the load when the load reaches a boiling state even if the user does not monitor the state of the load.

[0012] The purpose of this specification is to provide an induction heating device and a control method for the induction heating device that can detect the boiling state of a load by indirectly estimating the temperature of the load inside a container without directly measuring it.

[0013] The purpose of the present specification is to provide an induction heating device and a control method for the induction heating device in which the power level is automatically adjusted so that the load does not overflow out of the container when the load inside the container reaches a boiling state.

[0014] An object of the present specification is to provide an induction heating device and a method of controlling the induction heating device that can be automatically driven to a user-desired power level after the load inside the vessel reaches a boiling state.

[0015] The purpose of this specification is not limited to the aforementioned purposes, and other purposes and advantages of this specification not mentioned herein will be more clearly understood by the embodiments of this specification described below. Furthermore, the purposes and advantages of this specification can be realized by the components and combinations thereof described in the claims.

[0016]

[0017] An induction heating device according to one embodiment may include an upper plate on which a container is mounted, a working coil, an inverter including a plurality of switching elements and supplying current to the working coil, a driving circuit for supplying a switching signal to each switching element included in the inverter, and a controller for determining a driving frequency of the inverter and supplying a control signal based on the driving frequency to the driving circuit to drive the working coil.

[0018] In one embodiment, the controller can input a load amount of a load within the container and adjust a power level of the working coil based on the load amount.

[0019] In one embodiment, the controller may set the power level of the working coil to a final heating level when a predefined output termination condition is satisfied.

[0020] In one embodiment, the final heating level may be input through a manipulation area formed on the upper portion or through a user terminal.

[0021] In one embodiment, the controller may perform a final alarm action when the predefined output termination condition is satisfied.

[0022] In one embodiment, the controller can generate a temperature prediction value of a load within the container based on the load amount, and adjust the power level according to the temperature prediction value. In one embodiment, the controller can calculate a heating index of the container, determine an output profile corresponding to the load amount and the heating index, and adjust the power level according to the output profile.

[0023] In one embodiment, the output profile may include a plurality of output control conditions and a heating level corresponding to each output control condition.

[0024] In one embodiment, the output control condition may be determined based on at least one of a temperature prediction value for the load and an integrated power value of the working coil.

[0025] In one embodiment, the controller may set the power level of the working coil to an intermediate heating level corresponding to the output regulation condition defined in the output profile when the output regulation condition is satisfied.

[0026] In one embodiment, the controller may perform an intermediate alarm action when an output regulation condition defined in the output profile is satisfied.

[0027] In one embodiment, the load may be input through a manipulation area formed on the upper portion or through a user terminal.

[0028] In one embodiment, a method for controlling an induction heating device, comprising: an upper portion on which a vessel is mounted; a working coil; an inverter including a plurality of switching elements and supplying current to the working coil; a driving circuit for supplying switching signals to each switching element included in the inverter; and a controller for determining a driving frequency of the inverter and supplying a control signal based on the driving frequency to the driving circuit to drive the working coil, may include a step of the controller receiving a load amount of a load within a vessel provided above the working coil; and a step of the controller adjusting a power level of the working coil based on the load amount.

[0029] In one embodiment, the step of the controller adjusting the power level of the working coil based on the load may include the step of setting the power level of the working coil to a final heating level when a predefined output termination condition is satisfied.

[0030] In one embodiment, the final heating level may be input through a manipulation area formed on the upper portion or through a user terminal.

[0031] A control method of an induction heating device according to one embodiment may further include a step of the controller performing a final alarm operation when the predefined output termination condition is satisfied.

[0032] In one embodiment, the step of the controller adjusting the power level of the working coil based on the load may include the step of the controller generating a temperature prediction value of the load within the vessel based on the load, and the step of the controller adjusting the power level according to the temperature prediction value.

[0033] In one embodiment, the step of the controller adjusting the power level of the working coil based on the load may include the step of the controller calculating a heating index of the vessel, the step of the controller determining an output profile corresponding to the load and the heating index, and the step of the controller adjusting the power level according to the output profile.

[0034] In one embodiment, the output profile may include a plurality of output control conditions and a heating level corresponding to each output control condition.

[0035] In one embodiment, the output control condition may be determined based on at least one of a temperature prediction value for the load and an integrated power value of the working coil.

[0036] In one embodiment, the step of the controller adjusting the power level of the working coil based on the load may include a step of the controller setting the power level of the working coil to an intermediate heating level corresponding to the output adjustment condition defined in the output profile when the output adjustment condition is satisfied.

[0037] A control method of an induction heating device according to one embodiment may further include a step of the controller performing an intermediate alarm operation when an output adjustment condition defined in the output profile is satisfied.

[0038] In one embodiment, the load may be input through a manipulation area formed on the upper portion or through a user terminal.

[0039]

[0040] According to the induction heating device and the control method of the induction heating device of the embodiments, it is possible to accurately notify the user that the load inside the container has reached a boiling state through a simple operation without deteriorating the hygiene of the load inside the container.

[0041] According to the induction heating device and the control method of the induction heating device of the embodiments, it is possible to accurately notify a user that the load inside the container has reached a boiling state without a separate sensor or part.

[0042] According to the induction heating device and the control method of the induction heating device of the embodiments, it is possible to accurately notify a user that the load inside the container has reached a boiling state for more types of containers.

[0043] According to the induction heating device and the control method of the induction heating device of the embodiments, even if the user does not monitor the state of the load, the load can be maintained in a boiling state without increasing the temperature of the load when the load reaches a boiling state, so that safety can be improved.

[0044] According to the induction heating device and the control method of the induction heating device of the embodiments, the temperature of the load inside the container is indirectly estimated without directly measuring it, so that the boiling state of the load can be detected.

[0045] According to the induction heating device and the control method of the induction heating device of the embodiments, when the load inside the container reaches a boiling state, the power level of the induction heating device can be automatically adjusted so that the load does not overflow out of the container.

[0046] According to the induction heating device and the control method of the induction heating device of the embodiments, the induction heating device can be automatically driven at a power level desired by the user after the load inside the container reaches a boiling state.

[0047]

[0048] Figure 1 illustrates the configuration of an induction heating device, a user terminal, and a management server according to one embodiment.

[0049] Figure 2 is an exploded perspective view of an induction heating device according to one embodiment.

[0050] Fig. 3 is a circuit diagram of an induction heating device according to one embodiment.

[0051] Figure 4 shows an operating area of ​​an induction heating device according to one embodiment.

[0052] FIG. 5 illustrates an example of an output profile for an output control operation of an induction heating device according to one embodiment.

[0053] Figures 6 to 10 illustrate output control operation setting screens of an application running on a user terminal according to one embodiment.

[0054] Fig. 11 is a flowchart showing a control method of an induction heating device according to one embodiment.

[0055] Fig. 12 is a flowchart showing a control method of an induction heating device according to another embodiment.

[0056] Fig. 13 is a flowchart showing a control method of an induction heating device according to another embodiment.

[0057] FIG. 14 is a graph showing a load temperature value, a temperature prediction value, an accumulated power value, and a power level when a load inside a container is heated according to a control method of an induction heating device according to one embodiment.

[0058] FIG. 15 is a graph showing a load temperature value, a temperature prediction value, an accumulated power value, and a power level when a load inside a container is heated according to a control method of an induction heating device according to one embodiment.

[0059]

[0060] The above-described objects, features, and advantages are described in detail below with reference to the attached drawings, so that those skilled in the art to which the present disclosure pertains can easily practice the embodiments of the present disclosure. In describing the present disclosure, if a detailed description of a known technology related to the present disclosure is determined to unnecessarily obscure the gist of the present disclosure, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals indicate the same or similar components.

[0061] Figure 1 illustrates the configuration of an induction heating device, a user terminal, and a management server according to one embodiment.

[0062] An induction heating device (10) according to one embodiment may include a heating means (151), a temperature sensor (152), a controller (153), and a communication unit (154).

[0063] An induction heating device (10) may include a heating zone. A user may supply a container containing a load to be cooked (e.g., food) to the heating zone.

[0064] The induction heating device (10) may include a heating means (151) positioned at a position corresponding to a heating area. The heating means (151) may supply thermal energy to a container to heat a container or a load within the container provided in the heating area provided in the induction heating device (10). Examples of the heating means (151) include a working coil, a surface heating element, a gas burner, etc., but the type of the heating means (151) is not limited thereto.

[0065] A temperature sensor (152) may be placed on one side of the heating means (151). The temperature sensor (152) may sense a temperature value measured at the position where it is placed and transmit the sensed temperature value to the controller (153).

[0066] The controller (153) can control the operation of the heating means (151). Although not shown, the induction heating device (10) can include an input means (e.g., a touch panel or a knob) for adjusting or setting the thermal power of each heating area or inputting a heating start command or a heating end command for each heating area. When a heating start command is input through the input means (not shown), the controller (153) can drive the heating means (151) corresponding to each heating area according to the thermal power set through the input means (not shown). When a heating end command is input through the input means (not shown), the controller (153) can terminate the operation of the heating means (151).

[0067] The communication unit (154) can communicate with the management server (30) or the user terminal (20) via wireless or wired communication. The communication unit (154) can receive information input by the user via the user terminal (20) from the user terminal (20) or the management server (30). The communication unit (154) can transmit information related to the operation of the induction heating device (10) or information input by the user via the induction heating device (10) to the management server (30) or the user terminal (20).

[0068] The user terminal (20) may include a display (251), an input device (252), and a communication unit (253). Examples of the user terminal (20) include a mobile terminal such as a smartphone, a tablet, a laptop, a desktop, etc., but the type of the user terminal (20) is not limited thereto.

[0069] The display (251) can display information stored in the user terminal (20) or information input by the user through the input device (252).

[0070] The input device (252) is a means for the user to input desired information. In one embodiment, the display (251) and the input device (252) may be implemented as a single device, such as a touch panel.

[0071] The communication unit (253) can communicate with the induction heating device (10) or the management server (30) through wireless communication or wired communication. The communication unit (154) can receive information related to the operation of the induction heating device (10) or information input by the user through the induction heating device (10) from the induction heating device (10) or the management server (30). The communication unit (154) can transmit information input by the user through the input device (252) to the induction heating device (10) or the management server (30). Although not shown, the communication unit (253) can be connected to an access point (AP) that performs wired or wireless communication and can communicate with the induction heating device (10) or the management server (30) through the access point.

[0072] The management server (30) can manage the accounts of users using the induction heating device (10) and the user terminal (20) and the devices registered to the user's account. In one embodiment, the user can register the induction heating device (10) to his / her account stored in the management server (30) using the user terminal (20).

[0073] The management server (30) can receive information related to the operation of the induction heating device (10) from the induction heating device (10). The management server (30) can transmit the information received from the induction heating device (10) to the user terminal (20). Accordingly, the user can check information related to the induction heating device (10) through the user terminal (20).

[0074] Additionally, the management server (30) can receive information or commands input by the user through the user terminal (20). The management server (20) can transmit the information or commands received from the user terminal (20) to the induction heating device (10).

[0075] In some embodiments, the induction heating device (10) and the user terminal (20) may not exchange information through the management server (30). That is, the induction heating device (10) and the user terminal (20) may exchange information directly with each other.

[0076] Figure 2 is an exploded perspective view of an induction heating device according to one embodiment.

[0077] An induction heating device (10) according to one embodiment may include a case (102) forming a main body and a cover plate (104) coupled with the case (102) to seal the case (102).

[0078] The cover plate (104) can be coupled to the upper surface of the case (102) to seal a space formed inside the case (102). The cover plate (104) can include a top portion (106) on which a container for cooking food can be placed. In one embodiment, the top portion (106) can be made of a tempered glass material such as ceramic glass, but the material of the top portion (106) can vary depending on the embodiment.

[0079] The upper portion (106) may be formed with heating areas (12, 14) each corresponding to a working coil assembly (122, 124). In order to enable a user to clearly recognize the location of the heating areas (12, 14), lines or shapes corresponding to the heating areas (12, 14) may be printed or displayed on the upper portion (106).

[0080] The case (102) may have a hexahedral shape with an open top. A working coil assembly (122, 124) for heating the container may be arranged in a space formed inside the case (102). In addition, an interface unit (114) may be provided inside the case (102) that has a function of allowing a user to apply power or adjust the heat power, i.e., power level, of each heating zone (12, 14) and a function of displaying information related to the induction heating device (10). The interface unit (114) may be formed as a touch panel that allows both information input and information display by touch, but an interface unit (114) having a different structure may be used depending on the embodiment.

[0081] In addition, the upper part (106) may be provided with an operation area (118) positioned corresponding to the interface part (114). For the user's operation, characters or images may be printed in advance on the operation area (118). The user may perform a desired operation by touching a specific point on the operation area (118) with reference to the characters or images printed in advance on the operation area (118). In addition, information output by the interface part (114) may be displayed through the operation area (118). Therefore, the operation area (118) may also be referred to as a display.

[0082] The user can set the heat power, i.e., the power level, of each heating zone (12, 14) through the interface unit (114). For example, the power level can be displayed as a number (e.g., 1, 2, 3, ..., 9) on the operation area (118). When the power level for each heating zone (12, 14) is set, a target power value of a working coil corresponding to each heating zone (12, 14) and a heating frequency corresponding to the target power value can be determined. The controller can drive each working coil so that the output power value of each working coil matches the target power value set by the user based on the determined heating frequency.

[0083] A power supply unit (112) for supplying power to a working coil assembly (122, 124) or an interface unit (114) can be placed in a space formed inside the case (102).

[0084] For reference, in the embodiment of FIG. 2, two working coil assemblies, i.e., a first working coil assembly (122) and a second working coil assembly (124), are exemplarily illustrated as being arranged inside the case (102), but depending on the embodiment, one working coil assembly or three or more working coil assemblies may be arranged inside the case (102).

[0085] Each working coil assembly (122, 124) may be disposed at a position corresponding to each heating zone (12, 14). The working coil assembly (122, 124) may include a working coil that forms an induced magnetic field using a high-frequency alternating current supplied by the power supply unit (112) and an insulating sheet for protecting the coil from heat generated by the container. For example, in FIG. 2, the first working coil assembly (122) may include a first working coil (132) and a first insulating sheet (130) for heating a container placed in the first heating zone (12). Also, although not shown, the second working coil assembly (124) may include a second working coil and a second insulating sheet. Depending on the embodiment, an insulating sheet may not be disposed on each working coil assembly (122, 124). In the embodiment of FIG. 2, the first working coil and the second working coil can each be the heating means (151) illustrated in FIG. 1.

[0086] A temperature sensor may be placed at the center of each working coil. For example, in FIG. 1, a temperature sensor (134) may be placed at the center of the first working coil (132). Similarly, a temperature sensor may also be placed at the center of the second working coil. The temperature sensor may sense the temperature at the position where it is placed and transmit the sensed temperature value to the controller (153). In one embodiment, the temperature sensor may be a thermistor temperature sensor having a variable resistor whose resistance value changes depending on the temperature, but the type of the temperature sensor is not limited thereto.

[0087] The controller (153) can perform an overheat protection operation to lower the actual power value of the working coil or stop the operation of the working coil when the temperature value transmitted from the temperature sensor is higher than a predetermined reference value.

[0088] Although not shown in FIG. 2, a board on which a plurality of circuits or elements, including a controller (153) and a communication unit (154), are mounted may be placed in a space formed inside the case (102). The controller (153) may drive each working coil to perform a heating operation according to a user's heating start command input through the operation area (118) and the interface unit (114). When the user inputs a heating end command through the operation area (118) and the interface unit (114), the controller (153) may stop driving the working coil to end the heating operation.

[0089] Also, although not shown in FIG. 2, a speaker for audio output may be placed in the space formed inside the case (102).

[0090] Fig. 3 is a circuit diagram of an induction heating device according to one embodiment.

[0091] An induction heating device (10) according to one embodiment includes a rectifier circuit (202), a smoothing circuit (203), an inverter (or inverter circuit) (212), a working coil (WC), a controller (2), and a driving circuit (22). The working coil (WC) may be either the first working coil or the second working coil of the embodiment illustrated in FIG. 1.

[0092] The rectifier circuit (202) may include a plurality of diode elements. In one embodiment, the rectifier circuit (202) may be a bridge diode circuit, but depending on the embodiment, the rectifier circuit (202) may be another circuit. The rectifier circuit (202) may rectify an AC input voltage supplied from an external power supply (20) and output a voltage having a pulsating waveform.

[0093] The smoothing circuit (203) can smooth the voltage rectified by the rectifier circuit (202) and output a DC link voltage. The smoothing circuit (203) can include an inductor (L) and a DC link capacitor (CD).

[0094] The inverter (212) may include a first switching element (SW1), a second switching element (SW2), a third switching element (SW3), a fourth switching element (SW4), and a resonant capacitor (CR). The first switching element (SW1) and the second switching element (SW2) are connected in series with each other, and the third switching element (SW3) and the fourth switching element (SW4) are connected in series with each other. The first switching element (SW1) and the second switching element (SW2) are connected in parallel with the third switching element (SW3) and the fourth switching element (SW4). A working coil (WC) is connected between the connection points of the first switching element (SW1) and the second switching element (SW2) and the connection points of the third switching element (SW3) and the fourth switching element (SW4). The resonant capacitor (CR) is connected in series with the working coil (WC). The inverter (212) converts the current output from the smoothing circuit (204) into an alternating current and supplies the converted alternating current to the working coil (WC).

[0095] In one embodiment, the first switching element (SW1) and the second switching element (SW2) can be alternately turned on and off. In addition, the third switching element (SW3) and the fourth switching element (SW4) can be alternately turned on and off. By the alternate turning on and turning off operations, i.e., the switching operations, of the switching elements (SW1, SW2, SW3, SW4) included in the inverter (212), the DC link voltage input to the inverter (212) is converted into an AC current. The AC current converted by the inverter (212) is supplied to each of the working coils (WC). When the AC current is supplied, a resonance phenomenon occurs in the working coil (WC), and a container provided on the upper portion of the working coil (WC) is heated.

[0096] The controller (2) outputs a control signal for controlling the driving circuit (22). The driving circuit (22) supplies switching signals (SS1, SS2, SS3, SS4) to each switching element (SW1, SW2, SW3, SW4) according to the control signal supplied from the controller (2). In the present specification, the first switching signal (SS1), the second switching signal (SS2), the third switching signal (SS3), and the fourth switching signal (SS4) may each be a PWM (Pulse Width Modulation) signal having a predetermined duty cycle.

[0097] When the alternating current output from the inverter (212) is supplied to the working coil (WC), the working coil (WC) is driven. When the working coil (WC) is driven, a container provided on top of the working coil (WC) is heated. The amount of heat energy supplied to the container may vary depending on the amount of power actually generated by driving the working coil (WC), i.e., the output power value of the working coil.

[0098] For example, when a user inputs a power on command through the operation area (118) of the induction heating device (10) to change the induction heating device (10) to a power on state, power is supplied to the induction heating device (10) from an external power supply (20) and the induction heating device (10) enters an operation standby state. Then, the user can input a heating start command by setting a power level for the first heating area (12) and / or the second heating area (14). When the user inputs the heating start command, the controller (2) can determine the required power value of the working coil (WC) corresponding to the power level set by the user.

[0099] The controller (2) that receives the heating start command can determine a frequency corresponding to the required power value of the working coil (WC), i.e., a heating frequency, and supply a control signal corresponding to the determined heating frequency to the driving circuit (22). Accordingly, the working coil (WC) can be driven when the switching signals (SS1, SS2, SS3, SS4) output from the driving circuit (22) are input to the switching elements (SW1, SW2, SW3, SW4), respectively. When the working coil (WC) is driven, a container provided on the upper portion of the working coil (WC) can be heated.

[0100] An induction heating device (10) according to one embodiment may include a shunt resistor (RS1). The shunt resistor (RS1) may be connected between a smoothing circuit (203) and an inverter (212). Depending on the embodiment, the shunt resistor (RS1) may be omitted.

[0101] An induction heating device (10) according to one embodiment may include an input current sensor (31) that senses the magnitude of the current flowing through the shunt resistor (RS1), i.e., the current value. The controller (2) may calculate the magnitude of the current input to the working coil (WC), i.e., the current value, based on the current value sensed through the shunt resistor (RS1).

[0102] In one embodiment, the controller (2) can sense the magnitude of the voltage applied to both ends of the DC link capacitor (CD), i.e., the DC link voltage value, using a voltage sensor (33).

[0103] In one embodiment, the controller (2) can calculate the output power value of the working coil (WC) according to [Mathematical Formula 1].

[0104]

[0105] [Mathematical Formula 1]

[0106] P = V dc × I avg

[0107]

[0108] In [Mathematical Formula 1], P represents the output power value of the working coil (WC), Vdc represents the magnitude of the voltage applied to both ends of the DC link capacitor (CD), i.e., the DC link voltage value, and Iavg represents the average value of each current value sensed through the shunt resistor (RS1).

[0109] The method by which the controller (2) calculates the output power value of the working coil (WC) based on [Mathematical Formula 1] is only one example. The controller (2) can calculate the output power value of the working coil (WC) using other known methods.

[0110] In one embodiment, the controller (2) can measure the size of the resonant current generated by the working coil (WC) when the working coil (WC) is driven, i.e., the resonant current value of the working coil (WC), using the resonant current sensor (35). The controller (2) can adjust the output power value of the working coil (WC) based on the resonant current value measured by the resonant current sensor (35).

[0111] Figure 4 shows an operating area of ​​an induction heating device according to one embodiment.

[0112] An operation area (118) of an induction heating device according to one embodiment may include a power button (301) and a power lamp (302). A user may input a power-on command by pressing the power button (301) when the induction heating device is in a power-off state. When the power-on command is input, the induction heating device may be switched to a power-on state, and the power lamp (302) may be turned on. A user may input a power-off command by pressing the power button (301) when the induction heating device is in a power-on state. When the power-off command is input, the induction heating device may be switched to a power-off state, and the power lamp (302) may be turned off.

[0113] An operating area (118) of an induction heating device according to one embodiment may include a first power level display window (311), a first power level adjustment button (312), a second power level display window (321), and a second power level adjustment button (322). A user may input or change the power level of the first working coil through the first power level adjustment button (312).

[0114] When a user inputs or changes the power level of the first working coil through the first power level adjustment button (312), the power level of the first working coil can be displayed in the first power level display window (311). The user can input or change the power level of the second working coil through the second power level adjustment button (322). When a user inputs or changes the power level of the second working coil through the second power level adjustment button (322), the power level of the second working coil can be displayed in the second power level display window (321).

[0115] In one embodiment, the power level of the first working coil and the power level of the second working coil may be set to any one of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and turbo. As the power level increases, the output power value of each working coil may increase. However, the range and value of the power level of each working coil may be set differently depending on the embodiment.

[0116] When a user inputs a power level from 1 to turbo through the first power level adjustment button (312) or the second power level adjustment button (322), power may be supplied to each working coil, and a heating operation may start. That is, inputting a power level from 1 to turbo through the first power level adjustment button (312) or the second power level adjustment button (322) may be equivalent to inputting a heating start command. When a user inputs a power level of 0 through the first power level adjustment button (312) or the second power level adjustment button (322), power may be cut off to each working coil, and a heating operation may end. That is, inputting a power level of 0 through the first power level adjustment button (312) or the second power level adjustment button (322) may be equivalent to inputting a heating end command.

[0117] An operation area (118) of an induction heating device according to one embodiment may include a first timer display window (313), a second timer display window (323), and timer adjustment buttons (303, 304). When each working coil is driven, a user can input or change the driving time of each working coil in a predetermined unit (e.g., in minutes) through the timer adjustment buttons (303, 304). The user can decrease the driving time through the timer decrease button (303) or increase the driving time through the timer increase button (304).

[0118] When a user inputs the driving time of each working coil, the driving time of each working coil can be displayed in the first timer display window (313) or the second timer display window (323). The driving time displayed in the first timer display window (313) or the second timer display window (323) can decrease until it becomes 0. When the driving time displayed in the first timer display window (313) or the second timer display window (323) becomes 0, the driving of the working coil can be terminated.

[0119] An operation area (118) of an induction heating device according to one embodiment may include load input buttons (331, 332, 333) and load display lamps (341, 342, 343). A user may input the capacity or volume of a load inside a container, i.e., the load amount, through the load input buttons (331, 332, 333). When a user inputs a load amount by pressing any one of the load input buttons (331, 332, 333), a lamp corresponding to the load amount pressed by the user among the load display lamps (341, 342, 343) may light up.

[0120] In Fig. 4, three load input buttons (331, 332, 333) corresponding to load amounts of 0.5 L, 1.0 L, and 1.5 L are illustrated as examples, but the number of load input buttons and the numerical value of the load amount assigned to each load input button may vary depending on the embodiment.

[0121] In another embodiment, each load input button (331, 332, 333) may be assigned a different number, letter, and unit to indicate the capacity of the load. For example, each load input button (331, 332, 333) may be assigned a number and unit (e.g., 0.2 kg, 0.5 kg, 1.0 kg) indicating the mass of the load. In another example, each load input button (331, 332, 333) may be assigned a letter or number (e.g., small, medium, large or 1, 2, 3) indicating the relative capacity of the load.

[0122] In another embodiment, the induction heating device (10) may include a voice input device (e.g., a microphone) for receiving a user's voice input. The user may also input the load capacity by voice through the voice input device instead of the load capacity input buttons (331, 332, 333).

[0123] In another embodiment, a fine volume adjustment button (not shown) may be arranged on one side of the load input buttons (331, 332, 333). The user can adjust the load more precisely by pressing the fine volume adjustment button. For example, if the user presses the load input button (331) to input the load as 0.5 L and then presses the fine volume decrease button, the load may be decreased by a predetermined unit volume (e.g., 0.1 L), and if the fine volume increase button is pressed, the load may be increased by a predetermined fine adjustment volume (e.g., 0.1 L). The size of the unit volume assigned to the fine volume adjustment button may vary depending on the embodiment.

[0124] Hereinafter, an exemplary process of heating a container placed in a first heating area (12) of an induction heating device according to one embodiment is described with reference to FIGS. 1 to 4.

[0125] In one embodiment, a user may provide a container containing a load to the first heating zone (12) and press a power button (301) to turn the induction heating device (10) on.

[0126] In one embodiment, the controller (2) can calculate a heating index of a container provided on top of the first working coil (132) while driving the first working coil (132) at a predetermined target power value. For example, the heating index of the container can be defined as in [Mathematical Formula 2] below.

[0127]

[0128] [Equation 2]

[0129] PEI = PR / PC

[0130] (Here, PEI is the heating index, PR is the output power value of the first working coil (132), and PC is the target power value of the first working coil (132))

[0131] In [Mathematical Formula 2], (PR / PC) is the ratio of the output power value (PR) of the working coil to the required power value (PC) of the first working coil (132). That is, when the first working coil (132) is driven according to the required power value (PC), the closer the actual output power value (PR) of the first working coil (132) is to the required power value (PC), the higher the heating efficiency of the container can be evaluated. In one embodiment, a relationship of (PR / PC) ≤ 1 can be established.

[0132] For example, if the required power value (PC) for the first working coil (132) is set to 1000 W and the output power value (PR) of the working coil calculated by the controller (2) when the first working coil (132) is driven is 800 W, the heating index (PEI) of the first working coil (132) can be determined as 0.8.

[0133] The higher the PEI, the higher the heating efficiency and lower the power loss of the container. Furthermore, the higher the PEI, the faster the load inside the container can heat.

[0134] In another embodiment, the controller (2) can drive the first working coil (132) according to a predetermined required power value and calculate a heating index according to [Mathematical Formula 3].

[0135]

[0136] [Equation 3]

[0137] PEI = (PR / PC) × (RI / CI)

[0138] (Here, PEI is the heating index, PR is the output power value of the first working coil (132), PC is the required power value of the first working coil (132), RI is the predetermined limit current value, and CI is the resonance current value of the first working coil (132))

[0139]

[0140] The heating index defined in [Mathematical Formula 3] reflects not only the output power value of the first working coil (132) but also the resonant current value of the first working coil (132). Accordingly, more accurate information regarding the heating efficiency of the container provided above the first working coil (132) can be provided to the user.

[0141] In [Mathematical Formula 3], (PR / PC) is the ratio of the output power value (PR) of the first working coil (132) to the required power value (PC) of the first working coil (132). That is, when the first working coil (132) is driven according to the required power value (PC), the closer the actual output power value (PR) of the first working coil (132) is to the required power value (PC), the higher the heating efficiency of the container can be evaluated. In one embodiment, a relationship of (PR / PC) ≤ 1 can be established.

[0142] In [Mathematical Formula 3], (RI / CI) is the ratio of the limit current value to the resonant current value of the first working coil (132). The limit current value may be set differently depending on the embodiment as a predetermined value. If the resonant current value is greater than a predetermined reference value during the driving process of the working coil, the controller (2) may reduce the output power value of the working coil to prevent a temperature rise of components around the working coil. That is, even if the (PR / PC) value is high, the output power value of the working coil may be lowered if the resonant current value of the working coil is high. Therefore, if the (RI / CI) value is reflected in the heating index, the actual output value of the working coil according to the output control based on the resonant current value of the working coil can be accurately predicted.

[0143] In one embodiment, a relationship of (RI / CI) ≥ 1 may be established. As the resonant current value increases, the (RI / CI) value may decrease, and as the resonant current value decreases, the (RI / CI) value may increase.

[0144] The higher the PEI, the higher the heating efficiency and lower the power loss of the container. Furthermore, the higher the PEI, the faster the load inside the container can heat.

[0145] The controller (2) can convert the previously calculated heating index into a number in a predetermined range (e.g., 1 to 10) by referring to a predetermined formula or table, and display the converted heating index in the heating index display area. For example, if the heating index calculated in step (704) exceeds 0.9 and is less than or equal to 1.0, the controller (2) can convert the heating index into 10 and display it, and if the heating index exceeds 0.8 and is less than or equal to 0.9, the controller (2) can convert the heating index into 9 and display it. The formula or table for converting the heating index, and the range of the converted heating index may vary depending on the embodiment.

[0146] When a container is provided on top of the first working coil (132), the user can input the load amount (0.5 L) of the load in the container by pressing the first load amount input button (331) among the load amount input buttons (331, 332, 333). If the container is not provided on top of the first working coil (132) when the user presses one of the load amount input buttons (331, 332, 333), a predetermined alarm operation (e.g., voice output through a speaker and / or display of a specific character (e.g., “u”) on the first power level display window (311)) may be performed, and the output control operation described below may not be performed. In another embodiment, when the container is not provided on top of the first working coil (132), a voice for notifying the absence of the container may be output through the speaker of the induction heating device (10).

[0147] When a user inputs a load by pressing the first load input button (331) while a container is provided on top of the first working coil (132), a heating index (e.g., “8”) of the container provided on top of the first working coil (132) may be displayed on the first timer display window (313). In addition, when the user inputs the load, a letter (e.g., “A”) may be displayed on the first power level display window (311) to indicate that the induction heating device (10) is driven in an automatic mode in which the output of the first working coil (132) is automatically controlled.

[0148] In the present specification, when the induction heating device (10) is driven in the "automatic mode", heating of the container begins without the user having to input a power level, and the power level of the working coil can be automatically adjusted through the output control operation until the load inside the container reaches a boiling state. In addition, when the load inside the container reaches a boiling state, the power level of the working coil can be maintained at a predetermined final heating level. In the present specification, when the induction heating device (10) is driven in the "manual mode", the user must input the power level of each working coil through the power level control buttons (312, 322) to begin the heating operation of the working coil, and the power levels of the working coils are not automatically adjusted.

[0149] In one embodiment, when a user inputs a load by pressing the first load input button (331), a heating index (e.g., “8”) displayed on the first timer display window (313), a character (e.g., “A”) indicating an automatic mode displayed on the first power level display window (311), and the first load display lamp (331) may each blink for a predetermined time (e.g., 5 seconds). While the first load display lamp (331) blinks, the first working coil (132) is not driven, and the user may change the load by pressing another load input button (332, 333).

[0150] In one embodiment, when a container is provided on top of the first working coil (132), and the user presses any one of the load input buttons (331, 332, 333), the controller (2) may compare the heating index (PEI) of the container with a predetermined reference index (e.g., 7). If the comparison result shows that the heating index (PEI) of the container is less than the reference index, a predetermined alarm operation may be performed, and the output control operation described below may not be performed. For example, if the heating index (PEI) of the container is less than the reference index, a voice such as “Please check the heating index” or “Please check the size or material of the container” may be output through the speaker of the induction heating device (10).

[0151] If the comparison result shows that the heating index (PEI) of the container is greater than or equal to the reference index, the output control operation described below can be performed.

[0152] When a predetermined time (e.g., 5 seconds) has elapsed since the user pressed the first load input button (331), an output control operation may be initiated. When the output control operation is initiated, a letter (e.g., "A") indicating an automatic mode displayed on the first power level display window (311) and the first load display lamp (331) may change from a blinking state to a lit state. In addition, when the output control operation is initiated, a heating index (e.g., "8") may not be displayed on the first timer display window (313).

[0153] In one embodiment, the controller (2) can determine an output profile corresponding to the load amount and the heating index of the container input by the user. The output profile can be stored in advance in a storage unit (not shown).

[0154] FIG. 5 illustrates an example of an output profile for an output control operation of an induction heating device according to one embodiment.

[0155] Figure 5 illustrates a number of output profiles selected based on a user-entered load.

[0156] The controller (2) can select one of a plurality of output profiles based on the load amount input by the user. More specifically, the controller (2) can determine which range of load amount ranges predefined for each output profile illustrated in Fig. 5 the load amount input by the user falls within, and select an output profile based on the determination result.

[0157] For example, if the load amount input by the user is 0.5 L, the controller (2) can select the first output profile. As another example, if the load amount input by the user is 1.3 L, the controller (2) can select the third output profile.

[0158] The load range defined for each output profile may be set differently depending on the embodiment. In addition, the number of output profiles may vary depending on the embodiment.

[0159] As described above, since the output control operation is performed only when the heating index of the container is equal to or greater than a predetermined reference index (e.g., 7), the output profile of FIG. 5 may only include heating indices (10, 9, 8, 7) of the container for which the output control operation can be performed. However, the range and numerical value of the heating index of the container included in the output profile may vary depending on the embodiment.

[0160] Additionally, the output profile of FIG. 5 may include multiple output adjustment points (S0, S1, S2, S3). For example, the output adjustment points may include an output adjustment start point (S0), a first output adjustment point (S1), a second output adjustment point (S2), and an output adjustment end point (S3). The number of output adjustment points may be set differently depending on the embodiment.

[0161] Additionally, the output profile of FIG. 5 may include output control conditions corresponding to each output control point (S1, S2, S3).

[0162] In one embodiment, the output control condition may be set based on at least one of a temperature prediction value and an integrated power value.

[0163] In this specification, the temperature prediction value means the temperature value of the load inside the container predicted or estimated by the controller (2) at a specific point in time when the container is heated. For example, the controller (2) can generate a predicted value for the temperature of the load inside the container as a temperature prediction value by using a temperature prediction model generated in advance through machine learning when the container is heated. The input factors of the temperature prediction model used at this time may include the amount of load, the output power value of the working coil, the heating time, etc., but the input factors used in the temperature prediction model are not limited thereto, and various other input factors may be used to generate the temperature prediction value of the load inside the container depending on the embodiment. In addition, a different temperature prediction model may be used to generate the temperature prediction value depending on the embodiment.

[0164] In this specification, the accumulated power value refers to a value calculated by accumulating the output power value of the working coil, measured from the time when the driving of the working coil begins, by a predetermined time unit. In other words, the accumulated power value refers to the amount of power consumed by the working coil from the time when the driving of the working coil begins to a specific time point.

[0165] For example, if the load input by the user is 0.6 L, the controller (2) can select the first output profile among the output profiles shown in Fig. 5. The output control conditions of the first output profile can be set as follows, for example.

[0166] AA1: The predicted temperature is 85℃ and the accumulated power is 1440W.

[0167] AA2: The predicted temperature is 90℃ and the accumulated power is 1570W.

[0168] AA3: The predicted temperature is 98℃ and the accumulated power is 1689W.

[0169] When the driving of the working coil and heating of the container begin at the output control start time (S0), the controller (2) can calculate the temperature prediction value and the accumulated power value at predetermined time units (e.g., 1 second).

[0170] The controller (2) can determine whether each output control point (S1, S2, S3) is reached by referring to the first output profile. Accordingly, the point in time when the temperature prediction value reaches 85°C and the integrated power value reaches 1440 W during the container heating process becomes the first output control point (S1). In addition, the point in time when the temperature prediction value reaches 90°C and the integrated power value reaches 1570 W becomes the second output control point (S2). In addition, the point in time when the temperature prediction value reaches 98°C and the integrated power value reaches 1689 W becomes the output control end point (S3). The output control condition corresponding to the output control end point (S3) may also be referred to as an output control end condition.

[0171] However, the output control conditions for defining the output control point may be set differently depending on the embodiment. For example, the output control conditions may be set solely based on the temperature prediction value or solely based on the integrated power value. In other embodiments, the output control conditions may be defined by values ​​other than the temperature prediction value or the integrated power value.

[0172] For example, if the load input by the user is 0.9 L, the controller (2) can select the second output profile among the output profiles shown in Fig. 5. The output control conditions of the second output profile can be set as follows, for example.

[0173] BB1: Temperature prediction is 85℃

[0174] BB2: The temperature prediction is 90℃

[0175] BB3: The temperature prediction is 98℃

[0176] When the driving of the working coil and heating of the container begin at the output control start time (S0), the controller (2) can produce a temperature prediction value at predetermined time units (e.g., 1 second).

[0177] The controller (2) can determine whether each output control point (S1, S2, S3) is reached by referring to the second output profile. Accordingly, the point in time when the temperature prediction value reaches 85°C during the container heating process becomes the first output control point (S1). In addition, the point in time when the temperature prediction value reaches 90°C becomes the second output control point (S2). In addition, the point in time when the temperature prediction value reaches 98°C becomes the output control end point (S3). The output control condition corresponding to the output control end point (S3) may also be referred to as the output control end condition.

[0178] As another example, if the load input by the user is 1.0 L, the controller (2) can select the second output profile among the output profiles shown in Fig. 5. The output control conditions of the second output profile can be set as follows, for example.

[0179] BB1: The accumulated power value is 2400W

[0180] BB2: The accumulated power value is 2800W

[0181] BB3: The accumulated power value is 3133W

[0182] When the driving of the working coil and heating of the container begin at the output control start time (S0), the controller (2) can produce a temperature prediction value at predetermined time units (e.g., 1 second).

[0183] The controller (2) can determine whether each output adjustment point (S1, S2, S3) is reached by referring to the second output profile. Accordingly, the point in time when the accumulated power value reaches 2400 W during the container heating process becomes the first output adjustment point (S1). In addition, the point in time when the accumulated power value reaches 2800 W becomes the second output adjustment point (S2). In addition, the point in time when the accumulated power value reaches 3133 W becomes the output adjustment end point (S3). The output adjustment condition corresponding to the output adjustment end point (S3) may also be referred to as the output adjustment end condition.

[0184] In addition, each output profile in FIG. 5 may include a power level of the working coil according to a combination of the heating index of the container and the output adjustment points (S0, S1, S2, S3). For example, when the heating index of the container is 10 and the load amount input by the user is 0.5 L, the controller (2) may adjust or change the power level of the working coil to the power levels (9, 8, 6, 6) recorded in the first output profile of FIG. 5 for each output point (S0, S1, S2, S3). The heating index defined in each output profile and the power level corresponding to each output adjustment point may be set differently depending on the embodiment.

[0185] In one embodiment, whenever at least one of the respective output adjustment points (S0, S1, S2, S3) is reached, a voice may be output through a speaker included in the induction heating device (10) to notify the user of the arrival of each output adjustment point (S0, S1, S2, S3).

[0186] For example, when the output control point (S2) is reached during the container heating process, a voice such as “The heat is controlled to prevent the food from overflowing” may be output through the speaker of the induction heating device (10). As another example, when the output control point (S2) is reached during the container heating process, an alarm message may be displayed or a specific character may blink through the operation area (118) of the induction heating device (10). As another example, when the output control point (S2) is reached during the container heating process, an alarm message may be displayed through the display of the user terminal (20) or an alarm voice may be output through the speaker of the user terminal (20). This operation may be referred to as an “intermediate alarm operation.”

[0187] As another example, when the output control end point (S3) is reached during the container heating process, a voice such as “The food is boiling, so the smart alarm operation is terminated” may be output through the speaker of the induction heating device (10). As another example, when the output control point (S2) is reached during the container heating process, an alarm message may be displayed or a specific character may blink through the operation area (118) of the induction heating device (10). As another example, when the output control point (S2) is reached during the container heating process, an alarm message may be displayed through the display of the user terminal (20) or an alarm voice may be output through the speaker of the user terminal (20). This operation may be referred to as a “final alarm operation.”

[0188] An example of an output control operation performed by the controller (2) according to the output profile illustrated in Fig. 5 is as follows. When a user provides a container with a load on the first working coil (132), the user presses the second load input button (332) to input the load amount (1.0 L) of the container. Then, the controller (2) calculates the heating index of the container provided on the first working coil (132).

[0189] Here, the output control conditions of the second output profile can be defined as follows.

[0190] BB1: The predicted temperature is 85℃ and the accumulated power is 240W.

[0191] BB2: The predicted temperature is 90℃ and the accumulated power is 2800W.

[0192] BB3: The predicted temperature is 98℃ and the accumulated power is 3133W.

[0193] Assuming that the generated heating index is 8, the controller (2) performs an output control operation according to the second output profile illustrated in Fig. 5. The controller (2) first sets the power level of the first working coil (132) to an initial heating level (9) corresponding to the output control start time (S0) of the output profile. Accordingly, the first working coil (132) is driven to output an output power value corresponding to the set initial heating level (9), thereby starting heating of the container.

[0194] When the output control operation is initiated and the container is heated, the controller (2) calculates a temperature prediction value and an integrated power value at predetermined time units (e.g., 1 second). When the calculated temperature prediction value reaches 85°C and the integrated power value reaches 2400 W, the controller (2) changes the power level of the first working coil (132) to the first intermediate heating level (8). After the power level is changed to the first intermediate heating level (8), when the calculated temperature prediction value reaches 90°C and the integrated power value reaches 2800 W, the controller (2) changes the power level of the first working coil (132) to the second intermediate heating level (6).

[0195] When the temperature prediction value calculated after the power level is changed to the second intermediate heating level (6) reaches 98°C and the accumulated power value reaches 3133 W, that is, when the output regulation termination condition is satisfied (output regulation termination time point (S3)), the controller (2) terminates the output regulation operation while maintaining the power level of the first working coil (132) at the final heating level (6).

[0196] That is, the controller (2) can reduce the power level of the working coil until a predefined output regulation termination condition is satisfied.

[0197] When the output regulation termination condition is satisfied, the controller (2) can perform a predetermined output maintenance operation.

[0198] In one embodiment, the output maintenance action may include a predefined alarm action (e.g., an audio output through a speaker, a boil-over notification message or audio output through an application associated with the induction heating device).

[0199] In another embodiment, the power maintenance operation may include an operation of maintaining the power level of the working coil at a final heating level corresponding to a predefined output regulation end point (S3). For example, in the above-described embodiment, when the power maintenance operation is performed, the power level of the first working coil (132) may be maintained at the final heating level (6). Accordingly, the load inside the vessel provided on the first working coil (132) may be maintained in a boiling state.

[0200] In another embodiment, the output maintenance operation may include an operation of displaying the power level of the working coil in a power level display window (311, 321) of the operating area (118). For example, in the embodiment described above, when the output maintenance operation is performed, the first power level display window (311) may display 6, which is the current power level of the first working coil (132), instead of the letter (“A”) indicating the automatic mode.

[0201] In another embodiment, the output maintenance operation may include an operation in which the load indication lamps (341, 342, 343) are turned off. For example, in the embodiment described above, when the output maintenance operation is performed, the second load indication lamp (342) corresponding to the second load input button (332) may be turned off.

[0202] Figures 6 to 10 illustrate output control operation setting screens of an application running on a user terminal according to one embodiment.

[0203] A user can input information for an output control operation of an induction heating device (10) using an application running on a user terminal (20). In FIGS. 6 to 10, the output control operation is referred to as a "smart alarm" operation, but the name of the output control operation is not limited thereto.

[0204] Fig. 6 illustrates a smart alarm operation setting screen of an application running on a user terminal (20). The smart alarm operation setting screen may display a load setting button (61), a final heating level setting button (62), and a setting value transmission button (63). The load setting button (61) may display the currently saved load setting value. The final heating level setting button (62) may display the currently saved final heating level setting value.

[0205] When a user presses or touches the load setting button (61), the load setting screen illustrated in FIG. 7 may be displayed on the user terminal (20). The user may input the load amount of the load inside the container by pressing or touching a desired button among the multiple load buttons (611, 612, 613) displayed on the load setting screen. A selection mark (614) may be displayed on the load amount selected by the user. After the load amount input is completed, when the user presses or touches the confirmation button (615), the load amount input by the user may be saved as the load amount setting value.

[0206] When a user presses or touches the final heating level setting button (62), the load setting screen illustrated in FIG. 8 may be displayed on the user terminal (20). The user may input the final heating level by pressing, touching, or dragging the power level setting tool (621) displayed on the load setting screen. The user may also input the final heating level by pressing or touching the power level increase / decrease buttons (623, 624).

[0207] The user can set the final heating level to be automatically input by turning the auto-set button (625) on, or can manually set the final heating level by using the power level setting tool (621) or the power level increase / decrease buttons (623, 624) with the auto-set button (625) turned off. When the user sets the final heating level to be automatically input by turning the auto-set button (625) on, the final heating level included in the output profile as shown in FIG. 5 can be stored as the final heating level setting value.

[0208] The final heating level display area (622) may display the final heating level entered by the user. If the user turns on the automatic setting button (625) to set the final heating level to be entered automatically, the final heating level display area (622) may display a word such as “automatic.”

[0209] After the final heating level input is completed, if the user presses or touches the confirmation button (626), the final heating level entered by the user can be saved as the final heating level setting value.

[0210] Referring back to FIG. 6, when the user presses or touches the setting value transmission button (63) while the load setting value and the final heating level setting value are stored, the stored load setting value and the final heating level setting value can be transmitted to the induction heating device (10). The load setting value and the final heating level setting value can be transmitted to the induction heating device (10) through the management server (30), or can be transmitted directly to the induction heating device (10) without going through the management server (30). When the load setting value and the final heating level setting value are transmitted, the controller (2) can perform an output control operation for the working coil based on the transmitted load setting value and the final heating level setting value.

[0211] Fig. 9 illustrates an operation display screen of an induction heating device (10) running on a user terminal (10). The operation display screen may display an operation information display area (641) of a heating area currently in operation among heating areas of the induction heating device (10), a power level information display area (642) of a heating area currently in operation, a timer information display area (643) of a heating area currently in operation, and an output control operation information display area (644).

[0212] The operation information display area (641) may display the power level (e.g., 9) and operation time (e.g., 7 minutes) of the currently operating heating area.

[0213] The power level information display area (642) may display the power level (e.g., 9) of the currently operating heating area.

[0214] The timer information display area (643) may display the remaining operation time (e.g., 53 minutes) of the currently operating heating area.

[0215] The output control operation information display area (644) may display a message about the progress of the output control operation (e.g., “The smart alarm automatically ends when the water boils.”), information about the currently set load amount (e.g., 1.5 L), and information about the currently set final heating level (e.g., level 4).

[0216] Fig. 10 illustrates an operation display screen of an induction heating device (10) running on a user terminal (10) when an output termination condition is satisfied and an output maintenance operation is performed. When the output termination condition is satisfied, an output maintenance operation may be performed by the controller (2). When the output maintenance operation is performed, as illustrated in Fig. 10, the power level (e.g., 4) and operation time (e.g., 10 minutes) of the currently operating heating area may be displayed in the operation information display area (641).

[0217] The power level information display area (642) may display the power level (e.g., 4) of the currently operating heating area.

[0218] The timer information display area (643) may display the remaining operation time (e.g., 50 minutes) of the currently operating heating area.

[0219] The output control operation information display area (644) may display a message (e.g., “Water boiling was detected and the smart alarm was terminated”) to notify that the output termination condition has been satisfied, the output control operation has been completed, and the output maintenance operation is being performed.

[0220] The input interface and input method of the application illustrated in FIGS. 6 to 10 are merely examples, and other input interfaces and input methods may be applied depending on the embodiment.

[0221] Fig. 11 is a flowchart showing a control method of an induction heating device according to one embodiment.

[0222] The controller (2) of the induction heating device (10) according to one embodiment can input the load amount of the load inside the container provided on top of the working coil (702). In one embodiment, the load amount can be input by the load amount input buttons (331, 332, 333) arranged in the operation area (118). In another embodiment, the load amount can be input through the user terminal (20). The load amount input through the user terminal (20) can be transmitted to the induction heating device (10).

[0223] Next, the controller (2) can calculate the heating index of the container provided on the working coil (704). In one embodiment, the controller (2) can calculate the heating index of the container according to [Mathematical Formula 2] or [Mathematical Formula 3].

[0224] In one embodiment, when a load amount is input by a user, a heating index may be displayed in the operation area (118). In another embodiment, when a load amount is input by a user, a heating index may be output audibly through a speaker.

[0225] Next, the controller (2) can determine an output profile corresponding to the load input by the user and the previously calculated heating index (706).

[0226] In one embodiment, the output profile may include a plurality of output control conditions and a heating level corresponding to each output control condition.

[0227] In one embodiment, the output regulation condition may be determined based on at least one of a temperature prediction value for the load and an integrated power value of the working coil.

[0228] Next, the controller (2) can perform an output control operation for the working coil according to the determined output profile (708).

[0229] In one embodiment, the step of the controller (2) performing an output adjustment operation for the working coil according to the output profile may include a step of setting the power level of the working coil to an intermediate heating level corresponding to the output adjustment condition when a predefined output adjustment condition is satisfied.

[0230] In one embodiment, the step of the controller (2) performing an output adjustment operation for the working coil according to the output profile may include a step of performing an intermediate alarm operation when a predefined output adjustment condition is satisfied.

[0231] In one embodiment, the power level of the working coil can be reduced from the start point of output regulation of the working coil until a predefined output regulation end condition is satisfied.

[0232] In one embodiment, the step of the controller (2) performing an output regulation operation for the working coil according to the output profile may include a step of setting the power level of the working coil to a final heating level corresponding to the output termination condition when a predefined output regulation termination condition is satisfied.

[0233] In one embodiment, the final heating level may be defined in the output profile or input via the user terminal.

[0234] In one embodiment, the step of the controller (2) performing an output adjustment operation for the working coil according to the output profile may include a step of performing a final alarm operation when a predefined output termination condition is satisfied.

[0235] Fig. 12 is a flowchart showing a control method of an induction heating device according to another embodiment.

[0236] The controller (2) of the induction heating device (10) according to one embodiment can input the load amount of the load inside the container provided on top of the working coil (712). In one embodiment, the load amount can be input by the load amount input buttons (331, 332, 333) arranged in the operation area (118). In another embodiment, the load amount can be input through the user terminal (20). The load amount input through the user terminal (20) can be transmitted to the induction heating device (10) and passed to the controller (2).

[0237] Next, the controller (2) can calculate the heating index of the container provided on the working coil (714). In one embodiment, the controller (2) can calculate the heating index of the container according to [Mathematical Formula 2] or [Mathematical Formula 3].

[0238] In one embodiment, when a load amount is input by a user, a heating index may be displayed in the operation area (118). In another embodiment, when a load amount is input by a user, a heating index may be output audibly through a speaker.

[0239] Next, the controller (2) can receive a final heating level (714). In one embodiment, the final heating level can be input via the user terminal (20). The final heating level input via the user terminal (20) can be transmitted to the induction heating device (10) and passed to the controller (2).

[0240] Next, the controller (2) can determine an output profile corresponding to the load input by the user and the previously calculated heating index (718).

[0241] In one embodiment, the output profile may include a plurality of output control conditions and a heating level corresponding to each output control condition.

[0242] In one embodiment, the output regulation condition may be determined based on at least one of a temperature prediction value for the load and an integrated power value of the working coil.

[0243] Next, the controller (2) can perform an output control operation for the working coil according to the determined output profile (720).

[0244] In one embodiment, the step of the controller (2) performing an output adjustment operation for the working coil according to the output profile may include a step of setting the power level of the working coil to an intermediate heating level corresponding to the output adjustment condition when a predefined output adjustment condition is satisfied.

[0245] In one embodiment, the step of the controller (2) performing an output adjustment operation for the working coil according to the output profile may include a step of performing an intermediate alarm operation when a predefined output adjustment condition is satisfied.

[0246] In one embodiment, the power level of the working coil can be reduced from the start point of output regulation of the working coil until the predefined output regulation end condition is satisfied.

[0247] Next, the controller (2) can set the power level of the working coil to the final heating level when a predefined output regulation termination condition is satisfied (722).

[0248] In one embodiment, the controller (2) may perform a final alarm action when a predefined output termination condition is satisfied.

[0249] Fig. 13 is a flowchart showing a control method of an induction heating device according to another embodiment.

[0250] The controller (2) of the induction heating device (10) according to one embodiment can input the load amount of the load inside the container provided on top of the working coil (732). In one embodiment, the load amount can be input by the load amount input buttons (331, 332, 333) arranged in the operation area (118). In another embodiment, the load amount can be input through the user terminal (20). The load amount input through the user terminal (20) can be transmitted to the induction heating device (10) and passed to the controller (2).

[0251] Next, the controller (2) can adjust the power level of the working coil based on the input load (734).

[0252] In one embodiment, the step of the controller (2) adjusting the power level of the working coil based on the load may include the step of setting the power level of the working coil to a final heating level when a predefined output termination condition is satisfied.

[0253] In one embodiment, the final heating level may be input through a manipulation area (118) formed on the top plate (106) or through a user terminal (20). The final heating level input through the user terminal (20) may be transmitted to the induction heating device (10) and passed to the controller (2).

[0254] The control method of the induction heating device according to one embodiment may further include a step of the controller (2) performing a final alarm operation when a predefined output termination condition is satisfied.

[0255] In one embodiment, the step of the controller (2) adjusting the power level of the working coil based on the load may include the step of the controller (2) generating a temperature prediction value of the load within the container based on the load and the step of the controller (2) adjusting the power level of the working coil according to the temperature prediction value.

[0256] In one embodiment, the step of the controller (2) adjusting the power level of the working coil based on the load may include the step of the controller (2) calculating a heating index of the container, the step of the controller (2) determining an output profile corresponding to the load and the heating index, and the step of the controller (2) adjusting the power level according to the determined output profile.

[0257] In one embodiment, the output profile may include a plurality of output control conditions and a heating level corresponding to each output control condition.

[0258] In one embodiment, the output regulation condition may be determined based on at least one of a temperature prediction value for the load and an integrated power value of the working coil.

[0259] In one embodiment, the step of the controller (2) adjusting the power level of the working coil based on the load may include a step of the controller (2) setting the power level of the working coil to an intermediate heating level corresponding to the output adjustment condition when the output adjustment condition defined in the output profile is satisfied.

[0260] A control method of an induction heating device according to one embodiment may further include a step of the controller (2) performing an intermediate alarm operation when an output adjustment condition defined in an output profile is satisfied.

[0261] In one embodiment, the load may be input through an operating area (118) formed on the upper portion (106) or through a user terminal (20). The load input through the user terminal (20) may be transmitted to the induction heating device (10) and transferred to the controller (2).

[0262] Fig. 14 is a graph showing a load temperature value, a temperature prediction value, an integrated power value, and a power level when a load inside a container is heated according to a control method of an induction heating device according to one embodiment. Fig. 15 is a graph showing a load temperature value, a temperature prediction value, an integrated power value, and a power level when a load inside a container is heated according to a control method of an induction heating device according to one embodiment.

[0263] The data in the graphs shown in FIGS. 14 and 15 were measured when a cast iron vessel containing 500 mL of water and having a heating index of 9 was heated by an induction heating device. In addition, in the embodiments of FIGS. 14 and 15, the induction heating device was operated in an automatic mode based on an output profile including four output control conditions and four output control points (S0, S1, S2, S3) corresponding to each output control condition.

[0264] Fig. 14 shows temperature value data (81) of the load inside the container measured when the induction heating device is driven in automatic mode under the conditions described above, upper limit data (82) and lower limit data (83) of the temperature prediction value calculated by the induction heating device, accumulated power value data (84) of the working coil calculated by the induction heating device, and a power level (85) of the working coil set by the induction heating device based on the output profile, respectively.

[0265] Referring to Fig. 14, the controller (2) of the induction heating device starts heating the container by setting the power level (85) of the working coil to the initial heating level (9) at the output regulation start point (S0).

[0266] The controller (2) can continuously produce temperature prediction values ​​(upper limit value (82) and lower limit value (83)) using a temperature prediction model generated in advance through machine learning while the container is being heated. For example, the controller (2) can use the upper limit value (82), the lower limit value (83) of the temperature prediction values, or the median or average value of the upper limit value (82) and the lower limit value (83) as the temperature prediction values ​​for output control.

[0267] Additionally, the controller (2) can continuously calculate the accumulated power value (84) by accumulating the power consumption of the working coil while the container is heated.

[0268] If the temperature prediction value (83) and the integrated power value (84) satisfy the first output control condition recorded in the output profile, the controller (2) can change the power level of the working coil to the first intermediate heating level (8) (first output control point in time (S1)). If the temperature prediction value (83) and the integrated power value (84) satisfy the second output control condition recorded in the output profile, the controller (2) can change the power level of the working coil to the second intermediate heating level (7) (second output control point in time (S2)). If the temperature prediction value (83) and the integrated power value (84) satisfy the output termination condition recorded in the output profile, the controller (2) can maintain the power level of the working coil to the final heating level (7) (output control termination point in time (S3)). Here, the final heating level (7) is a value stored in the output profile.

[0269] In one embodiment, at the second output adjustment point (S2), an intermediate alarm action (e.g., a voice output such as “I will adjust the heat so that it does not boil over”) may be performed through a speaker.

[0270] In one embodiment, at the output regulation end point (S3), a final alarm action (e.g., a voice output such as “Boiling temperature reached. End smart alarm.”) may be performed through a speaker.

[0271] Meanwhile, as described with reference to FIGS. 6 to 10, the final heating level may also be input through the user terminal (20). Referring to FIG. 15, for example, when the final heating level is set to 6, if the temperature prediction value (83) and the integrated power value (84) satisfy the output termination condition recorded in the output profile, the controller (2) can change and maintain the power level of the working coil to the final heating level (6) (output control termination point (S3)).

[0272] Figure 15 illustrates an example in which the final heating level (6) is set to a value lower than the second intermediate heating level (7). However, in other embodiments, the final heating level may be set to a value higher than the second intermediate heating level, or may be set to a value equal to the second intermediate heating level.

[0273] According to the control process illustrated in FIGS. 14 and 15, the load inside the container can be automatically and quickly heated in each output control section (S0 to S1, S1 to S2, S2 to S3). In addition, after the output control end point (S3), the power level of the working coil is maintained constant, and accordingly, the temperature of the load inside the container can also be maintained constant.

[0274] When the induction heating device according to the above-described embodiments is operated in automatic mode, heating of the container begins simply by inputting a load amount without the user having to set a power level, and the power level of the working coil automatically decreases until the load inside the container reaches a boiling state. Furthermore, when the load inside the container reaches a boiling state, the power level of the working coil can be maintained constant so that the power level of the working coil no longer increases and the load remains in a boiling state.

[0275] Additionally, the induction heating device according to the embodiments can notify the user that the load is in a boiling state through a predetermined alarm action (e.g., a voice output through a speaker, a boiling notification message or voice output through an application linked to the induction heating device) when the load inside the container reaches a boiling state. Therefore, the user can easily recognize that the load is in a boiling state even without monitoring the heating process of the container.

[0276] Although the present specification has been described with reference to the drawings exemplified above, the present specification is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art. Furthermore, even if the effects resulting from the configuration of the present specification have not been explicitly described and explained while describing the embodiments of the present specification, the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. The top part where the container is placed; working coil; An inverter comprising a plurality of switching elements and supplying current to the working coil; A driving circuit that supplies a switching signal to each switching element included in the above inverter; and A controller is included that determines the driving frequency of the inverter and supplies a control signal based on the driving frequency to the driving circuit to drive the working coil. The above controller Inputting the load amount of the load in the above container and controlling the power level of the working coil based on the load amount. Induction heating device.

2. In paragraph 1, The above controller When a predefined output termination condition is satisfied, the power level of the working coil is set to the final heating level. Induction heating device.

3. In paragraph 2, The final heating level above is Input through the operating area formed on the upper part or input through the user terminal Induction heating device.

4. In paragraph 2, The above controller When the above predefined output termination condition is satisfied, the final alarm action is performed. Induction heating device.

5. In paragraph 1, The above controller Generate a temperature prediction value of the load within the container based on the above load amount, and adjust the power level according to the temperature prediction value. Induction heating device.

6. In paragraph 1, The above controller Calculating the heating index of the above container, determining the output profile corresponding to the load and the heating index, and adjusting the power level according to the output profile. Induction heating device.

7. In paragraph 6, The above output profile is Containing multiple output control conditions and heating levels corresponding to each output control condition. Induction heating device.

8. In paragraph 7, The above output control conditions are Determined based on at least one of the temperature prediction value for the above load and the accumulated power value of the working coil. Induction heating device.

9. In paragraph 6, The above controller When the output control condition defined in the above output profile is satisfied, the power level of the working coil is set to an intermediate heating level corresponding to the output control condition. Induction heating device.

10. In paragraph 6, The above controller If the output control conditions defined in the above output profile are satisfied, an intermediate alarm action is performed. Induction heating device.

11. In paragraph 1, The above load amount is input through the operating area formed on the upper part or through the user terminal. Induction heating device.

12. A method for controlling an induction heating device, comprising: a top plate on which a container is installed; a working coil; an inverter including a plurality of switching elements and supplying current to the working coil; a driving circuit for supplying a switching signal to each switching element included in the inverter; and a controller for determining a driving frequency of the inverter and supplying a control signal based on the driving frequency to the driving circuit to drive the working coil. A step for the controller to input the load amount of the load within the container provided on top of the working coil; and The above controller comprises a step of adjusting the power level of the working coil based on the load. A method for controlling an induction heating device.

13. In paragraph 12, The step of the above controller adjusting the power level of the working coil based on the above load amount comprising a step of setting the power level of the working coil to a final heating level when a predefined output termination condition is satisfied; A method for controlling an induction heating device.

14. In paragraph 13, The final heating level above is Input through the operating area formed on the upper part or input through the user terminal A method for controlling an induction heating device.

15. In paragraph 13, further comprising a step of the controller performing a final alarm action when the above predefined output termination condition is satisfied. A method for controlling an induction heating device.

16. In paragraph 12, The step of the above controller adjusting the power level of the working coil based on the above load amount a step in which the controller generates a temperature prediction value of the load within the container based on the load amount; and The controller comprises a step of adjusting the power level according to the temperature prediction value. A method for controlling an induction heating device.

17. In paragraph 12, The step of the above controller adjusting the power level of the working coil based on the above load amount A step in which the controller calculates a heating index of the container; a step of the controller determining an output profile corresponding to the load amount and the heating index; and The above controller comprises a step of adjusting the power level according to the output profile. A method for controlling an induction heating device.

18. In paragraph 17, The above output profile is Containing multiple output control conditions and heating levels corresponding to each output control condition. A method for controlling an induction heating device.

19. In Article 18, The above output control conditions are Determined based on at least one of the temperature prediction value for the above load and the accumulated power value of the working coil. A method for controlling an induction heating device.

20. In paragraph 17, The step of the above controller adjusting the power level of the working coil based on the above load amount When the output regulation condition defined in the above output profile is satisfied, the controller includes a step of setting the power level of the working coil to an intermediate heating level corresponding to the output regulation condition. A method for controlling an induction heating device.

21. In paragraph 17, The controller further includes a step of performing an intermediate alarm operation when an output regulation condition defined in the above output profile is satisfied. A method for controlling an induction heating device.

22. In paragraph 12, The above load amount is input through the operating area formed on the upper part or through the user terminal. A method for controlling an induction heating device.

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