KR102175639B1 - Heating device and power control method - Google Patents

Abstract

The present disclosure discloses a heating device. The heating apparatus according to the technical idea of the present disclosure includes a first heating element for induction heating a first heating element, a second heating element for induction heating a second heating element, a first driving unit for supplying power to the first heating element, and a second heating element. 2 It includes a second driving unit that provides power to the heating element, a temperature sensor that generates temperature information according to the temperature of the first and second heated objects, and a control unit that controls the first driving unit and the second driving unit, The control unit controls the first driving unit and the second driving unit to provide power of a specified frequency to each of the first heating element and the second heating element, and each of the first and second heating elements is set by the user based on temperature information. It is possible to determine whether a reference temperature corresponding to the output has been reached, and to detect a resonance frequency of the second heating object having a temperature less than the reference temperature.

Description

Heating device and its output control method {HEATING DEVICE AND POWER CONTROL METHOD}

The technical idea of the present disclosure relates to a heating device and a method for controlling output of the heating device, and more particularly, to a heating device for controlling each output when driving a plurality of heating elements, and a method for controlling the output thereof.

Various types of heating devices are used in homes and restaurants for various purposes including cooking or sterilization. Recently, heating devices for heating an object to be heated such as a pot, a frying pan, a steamer, or a kettle using electricity have been popularized.

The heating method using electricity largely includes a resistance heating method and an induction heating method. The resistance heating method is a method of heating an object by directly transferring heat generated when an electric current is passed through a metal resistance wire or a non-metallic heating element such as silicon carbide through radiation or conduction to heat an object, and is used for highlights. On the other hand, the induction heating method is used for induction by generating an induction current in an object to be heated by using a change in a magnetic field generated around the coil when high-frequency power is applied to the coil to heat the object to be heated. When a plurality of heating elements operate through the induction heating method, there is a problem that noise is generated due to different operating frequencies.

A problem to be solved by the technical idea of the present disclosure is to provide a heating device in which noise generated from the heating elements is reduced when a plurality of heating elements operate simultaneously.

In order to achieve the above object, the heating apparatus according to an embodiment of the present disclosure includes: a first heating element for induction heating a first object to be heated, a second heating element for induction heating a second object to be heated, and a power supply to the first heating element A first driving unit that provides power, a second driving unit that provides power to the second heating element, a temperature sensor that generates temperature information according to the temperatures of the first and second heating elements, and the first driving unit and the second driving unit It includes a control unit for controlling, and the control unit controls the first driving unit and the second driving unit to provide power of a specified frequency to each of the first heating element and the second heating element, and based on the temperature information, the first heating element and the second It is possible to determine whether each of the heating targets has reached a reference temperature corresponding to a user's set output, and detect a resonance frequency of the second heating target having a temperature less than the reference temperature.

In an embodiment, the controller may control the first driving unit and the second driving unit to provide power at the resonance frequency of the second heating element to each of the first heating element and the second heating element.

In an embodiment, the control unit may control the first driving unit to turn off the first heating element while controlling the second driving unit to provide power at the resonance frequency of the second heating element to the second heating element.

In one embodiment, the control unit controls the second driving unit to provide power of the resonant frequency of the second heating element to the second heating element, and then the first heating element to provide power of a specified frequency to each of the first heating element and the second heating element. It is possible to control the driving unit and the second driving unit.

In an embodiment, the memory further includes a memory in which information on resonant frequencies of each of the different objects to be heated is stored, and the controller may select a specified frequency based on information on the resonant frequency stored in the memory.

In an embodiment, a memory in which the specified frequency is stored may be further included.

In order to achieve the above object, the heating apparatus according to an embodiment of the present disclosure includes: a first heating element for induction heating a first object to be heated, a second heating element for induction heating a second object to be heated, and a power supply to the first heating element A first driving unit providing power, a second driving unit providing power to the second heating element, a temperature sensor generating temperature information according to the temperature of the first heating element and the second heating element, and the first driving unit and the second And a control unit for controlling the driving unit, wherein the control unit detects a first resonant frequency of the first heated body and a second resonant frequency of the second heated body, and supplies power at the first resonance frequency to the first heating element and the second heating element. The first driving unit and the second driving unit may be controlled so as to be provided to each of them, and it may be determined whether the second heating object reaches a reference temperature corresponding to the user's set output based on the temperature information.

In an embodiment, when the second heating element is less than a reference temperature, the controller may control the first driving unit and the second driving unit to provide power of the second resonant frequency to the first heating element and the second heating element, respectively.

In an embodiment, when the second heating element is less than the reference temperature, the control unit controls the second driving unit to provide power of the resonant frequency of the second heating element to the second heating element, while the first driving unit is turned off. Can be controlled.

The heating apparatus according to the technical idea of the present disclosure may reduce noise generated when a plurality of heating elements simultaneously operate by controlling the operating frequency of each of the heating elements. In addition, the low output efficiency can be compensated for by adjusting the operating frequency of the heating element having relatively low output efficiency based on the temperature information of the heating object.

1 is a perspective view showing a heating device according to an exemplary embodiment of the present disclosure.
2 is a block diagram showing the configuration of the heating device shown in FIG.
3 is a diagram illustrating a heating device, an external power source, and an object to be heated according to an exemplary embodiment of the present disclosure.
4 is a diagram for explaining characteristic information of a heating object stored in a memory included in a heating device according to an exemplary embodiment of the present disclosure.
5 and 6 are flow charts illustrating a method of operating a heating device according to an exemplary embodiment of the present disclosure.
7 and 8 are flowcharts illustrating a method of operating a heating device according to an exemplary embodiment of the present disclosure.

Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, the embodiments of the present disclosure may be modified in various other forms, and the scope of the present disclosure should not be construed as being limited by the embodiments described below. It is preferable that the embodiments of the present disclosure be interpreted as being provided in order to more completely describe the present disclosure to those having average knowledge in the art. Identical symbols mean the same elements all the time. Furthermore, various elements and areas in the drawings are schematically drawn. Accordingly, the inventive concept is not limited by the relative size or spacing drawn in the accompanying drawings.

Unless otherwise defined, all terms used herein, including technical terms and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the inventive concept belongs. In addition, commonly used terms as defined in the dictionary should be construed as having a meaning consistent with what they mean in the context of the technology to which they are related, and in an excessively formal sense unless explicitly defined herein. It will be understood that it should not be interpreted.

1 is a perspective view showing a heating device according to an exemplary embodiment of the present disclosure. 2 is a block diagram showing the configuration of the heating device shown in FIG.

1 and 2, the heating device 100 may include a plate-shaped body. A user interface that is provided on one side of the plurality of heating elements 10_1 to 10_3 and the heating elements 10_1 to 10_3 on the upper part of the body to receive user input and display status information of the plurality of heating elements 10_1 to 10_3 40 can be placed. For example, the heating device 100 may be an electric range that uses electricity as an energy source to heat an object to be heated through a plurality of heating elements 10_1 to 10_3 corresponding to a crater.

The heating device 100 provides power to the plurality of heating elements 10_1 to 10_3 to drive the plurality of heating elements 10_1 to 10_3, a plurality of driving units 20_1 to 20_3, and a plurality of heating elements 10_1 to 10_3. A power supply unit 30 generating power provided by ), a user interface 40, a temperature sensor 50, and a control unit 60 for controlling overall operations of the heating device 100 may be included.

In one embodiment, the heating device 100 may include three heating elements, that is, a first heating element 10_1, a second heating element 10_2, and a third heating element 10_3, and the first heating element 10_1 A first driving unit 20_1 for supplying power to the second heating element 10_2, a second driving unit 20_2 for supplying electric power to the second heating element 10_2, and a third driving unit 20_3 for supplying electric power to the third heating element 10_3. I can. However, the present disclosure is not limited thereto, and the number of heating elements included in the heating device 100 may be variously configured. That is, the heating device 100 may include two heating elements, or may include four or more heating elements.

In one embodiment, the heating device 100 may include a plurality of inductions. For example, the first heating element 10_1 to the third heating element 10_3 may be induction. In an embodiment, the heating device 100 may include heating elements having different heating methods. For example, the first heating element 10_1 and the second heating element 10_2 may be induction, and the third heating element 10_3 may be a highlight.

A first body to be heated 200_1 and a second body to be heated 200_2 may be disposed on the first heating body 10_1 and the second heating body 10_2, respectively. The first body to be heated 200_1 and the second body to be heated 200_2 may represent objects heated by the heating device 100. The first body to be heated 200_1 and the second body to be heated 200_2 may include at least one of containers to be heated such as a pot, a frying pan, a steamer, a kettle, and a tea pot.

In one embodiment, the first heating body 200_1 and the second heating body 200_2 are induction load inductors electromagnetically coupled to the first heating body 10_1 and the second heating body 10_2 ( Inductor) can be expressed as an equivalent circuit in which the load resistance is connected. The first body to be heated 200_1 and the second body to be heated 200_2 may have different sizes of the load inductor and the size of the load resistance, respectively, and the first body to be heated 200_1 and the first body to be heated 200_1 and the second body to be heated using AC power of the same operating frequency. 2 When the heating target 200_2 is driven, the output efficiency may be different.

The power supply unit 30 may provide power to each of the plurality of driving units 20_1 to 20_3 from an external power source. Each of the plurality of driving units 20_1 to 20_3 may drive a corresponding heating element in response to the control of the controller 60, and may adjust the output of the corresponding heating element using power provided from the power supply unit 30. For example, the first driving unit 20_1 may adjust the output of the first heating element 10_1 in response to the control of the control unit 60, and the second driving unit 20_2 may control the second driving unit 20_1 in response to the control of the control unit 60. 2 The output of the heating element 10_2 can be adjusted, and the third driving unit 20_3 can adjust the output of the third heating element 10_3 in response to the control of the control unit 60.

The user interface 40 may provide a manipulation unit that receives a user's command and a display unit that displays information related to an operation state of each of the plurality of heating elements 10_1 to 10_3. That is, the user interface 40 provides a command corresponding to a user's manipulation, for example, selecting a plurality of heating elements 10_1 to 10_3 to be driven, or an on/off operation of the selected heating element, adjustment of driving time, and output adjustment. It can be generated and output to the control unit 60. The control unit is among various types of input devices such as capacitive touch panel, pressure sensitive touch panel, infrared type touch panel, ultrasonic type touch panel, physical button, optical key, keypad, (digital) pen sensor, and voice input device. It may include at least one. Depending on the implementation of the heating device 100, the operation unit may be implemented as one device with the display unit. For example, if the display unit includes a touchable display unit, the display unit may also perform a function of an input unit receiving a touch input signal.

The display unit of the user interface 40 may display an operating state of the heating device 100 such as on/off of the heating element, an output stage, a driving time, and a temperature, under the control of the controller 60. The display may provide various information on the operation of the heating device 100 by a visual method, an auditory method, or a method through other senses. To this end, the display unit may include a display unit and/or a speaker. In one embodiment, the heating device 100 may provide information on the driving efficiency of each of the first heating object 200_1 and the second heating object 200_2 to the user through the display unit of the user interface 40. have.

The temperature sensor 50 may detect the temperature of the object to be heated. For example, it is possible to detect the temperature of the first body to be heated 200_1 and the second body to be heated 200_2, and each of the detected first body to be heated 200_1 and the second body to be heated 200_2 A signal corresponding to the temperature may be transmitted to the controller 60. In one embodiment, the temperature sensor 50 may detect the temperatures of the first and second heated bodies 200_1 and 200_2 in a non-contact manner. For example, the temperature sensor 50 It may be a sensor that detects temperature by detecting infrared rays. Alternatively, in one embodiment, the temperature sensor 50 is in contact with the first body to be heated 200_1 and the second body to be heated 200_2 so that the first body to be heated 200_1 and the second body to be heated 200_2 You can also detect the temperature.

The control unit 60 may generally control the operation of various components in the heating device 100. The control unit 60 may be implemented in various forms such as a central processing unit (CPU), a processor, a microprocessor, an application processor (AP), a micro controller unit (MCU), a microcomputer, or a mini computer. .

The controller 60 may control an output of each of the plurality of heating elements 10_1 to 10_3 by controlling each of the plurality of driving units 20_1 to 20_3. The controller 60 may control the output of each of the plurality of heating elements 10_1 to 10_3 based on the user's setting received through the user interface 40.

In an embodiment, the control unit 60 may control the first driving unit 20_1 and the second driving unit 20_2 to match the operating frequencies of the first heating element 10_1 and the second heating element 10_2 with each other. When the first operating frequency of the first heating element 10_1 and the second operating frequency of the second heating element 10_2 are within an audible frequency of a person, noise may be generated. Accordingly, the control unit 60 can reduce noise by matching the first operating frequency and the second operating frequency.

In one embodiment, the control unit 60 may receive signals corresponding to the temperatures of the first heating object 200_1 and the second heating object 200_2 from the temperature sensor 50, respectively, and the first heating element ( 10_1) and the output efficiency of each of the second heating elements 10_2 may be determined. The control unit 60 may adjust the operating frequency of the first heating element 10_1 and the second heating element 10_2 to be close to the resonance frequency of the heating element having relatively low output efficiency. Accordingly, the control unit 60 may reduce noise that may occur when the first heating element 10_1 and the second heating element 10_2 are simultaneously driven, while increasing output efficiency.

3 is a diagram illustrating a heating device, an external power source, and an object to be heated according to an exemplary embodiment of the present disclosure. 4 is a diagram for explaining characteristic information of a heating object stored in a memory included in a heating device according to an exemplary embodiment of the present disclosure.

Referring to FIG. 3, the heating device 100 may receive power from an external power supply 300, and use the power provided from the external power supply 300 on the first heating element 10_1 of the heating device 100. The placed first body to be heated 200_1 may be heated. 3 shows the first heating element 10_1 on which the first heating element 200_1 is placed, but this is only for convenience of description, and the same in the second heating element 10_2 on which the second heating element 200_2 is placed. Description may apply. In addition, although FIG. 3 shows the first driving unit 20_1 for driving the first heating element 10_1, the same description can be applied to the second driving unit 20_2 for driving the second heating element 10_2.

The external power supply 300 may supply power to the heating device 100. The external power supply 300 may be a commercial power supply connected to the power input terminal of the heating device 100. The commercial power source may include 110V AC power, 220V AC power, 380V AC power, or other AC power having any voltage level depending on the country and/or region in which it is used.

The DC power generator 30 may generate a DC voltage by using the AC voltage received from the external power supply 300. The DC power generator 30 may be implemented using various types of rectifier circuits or rectifiers.

The first driver 20_1 may include a switching unit 21 and at least one capacitor (C of FIG. 3 ). The switching unit 21 may play a role of converting the DC voltage provided by the DC power generator 30 into an AC voltage under the control of the controller 60. If necessary, the switching unit 21 may generate an AC voltage having a higher frequency than the AC voltage received from the external power supply 300. The switching unit 21 may provide AC power having a specific frequency to the first heating element 10_1 under the control of the controller 60, and may generate a high-frequency magnetic field for induction heating.

In one embodiment, the switching unit 21 may be implemented as an inverter or the like. The switching unit 21 may include a switching element, and switching may be controlled under the control of the control unit 60. In one embodiment, the switching element may include an insulated gate bipolar transistor (IGBT). However, this is only an embodiment, and the switching unit 21 may include various types of switching elements such as a Silicon Controlled Rectifier (SCR), a MOS-FET, or an Integrated Gate-Commutated Thyristor (IGCT).

The first heating element 10_1 may receive AC power from the power supply unit 500 and may generate a magnetic field that changes over time by the supplied AC power. A change in the magnetic field generated by the first heating element 10_1 may cause a change in the magnetic flux around the first heating element 200_1, and a current is induced in the first heating element 200_1 due to the change in magnetic flux. Can be. The first heating element 10_1 may be referred to as a working coil. The first heating element 10_1 may be electromagnetically coupled to an inductor of the first heating object 200_1.

The first heating object 200_1 may be expressed as an equivalent circuit in which a load inductor electromagnetically coupled to the first heating element 10_1 of the heating device 100 and a load resistance are connected. As AC power is applied to the first heating element 10_1 of the heating device 100, the magnetic field around the inductor of the first heating element 200_1 electromagnetically coupled to the first heating element 10_1 is changed, Current may be induced in the inductor and load resistance of the heating body 200_1. As an induced current flows through the load resistor, the load resistor may generate heat, and the first body to be heated 200_1 may be heated by the heat generated from the load resistor.

The first heating element 10_1 and the first heating element 200_1 electromagnetically coupled between the first node Nd1 and the second node Nd2 are the first node Nd1 and the second node Nd2. It can be expressed as an equivalent circuit of equivalent impedance including an equivalent inductor and equivalent resistance connected in series therebetween. Therefore, even if the first driver 20_1 supplies an AC voltage with the same frequency and the same duty ratio, the inductance value L_load, the load resistance value R_load, and the first heating element 10_1 of the first heating object 200_1 According to the degree of coupling between the inductor of the first heating target 200_1 and the first heating target 200_1, the average power consumed by the first heating target 200_1 may vary.

In an embodiment, the first heating element 200_1 may operate at maximum power efficiency when power having a first resonance frequency is supplied to the first heating element 10_1. That is, as the operating frequency of the first heating element 10_1 increases from the first resonance frequency, the output efficiency of the first heating object 200_1 may be lowered. The first resonant frequency is determined by the inductance value (L_load) of the first heating object 200_1, the load resistance value (R_load), and the coupling degree of the inductor between the first heating element 10_1 and the first heating object 200_1. I can.

On the other hand, the second heating element 200_2 shown in FIG. 1 may operate at maximum power efficiency when power having a second resonance frequency is supplied to the second heating element 10_2. That is, as the operating frequency of the second heating element 10_2 increases from the second resonance frequency, the output efficiency of the second heating object 200_2 may be lowered. The second resonance frequency may be determined by an inductance value, a load resistance value of the second heating object 200_2, and a degree of coupling between the second heating element 10_2 and the inductor of the second heating object 200_2. In an embodiment, the first resonance frequency and the second resonance frequency may have different values.

The controller 60 may control a switching operation of the switching unit 21 to adjust a frequency and/or a duty ratio of the AC power output from the switching unit 21. The controller 60 may adjust the operating frequency of the first heating element 10_1, and the induction heating output of the first heating element 10_1 may be adjusted as the operating frequency is controlled.

3 and 4, the memory 70 may store information about the heating device 100 and various types of information necessary for controlling the heating device 100. For example, various types of information and algorithms required for a control operation of the controller 60 may be stored in the memory 70. The memory 70 may include at least one of a nonvolatile memory such as a flash memory and a magnetoresistive memory, and a volatile memory such as DRAM and SRAM. The memory 70 may be implemented as hardware separate from the controller 60, but is not limited thereto. For example, when the control unit 60 is implemented as a microcomputer or a mini-computer, the memory 70 may be implemented as one piece of hardware with the control unit 60.

In an embodiment, the memory 70 may store characteristic information of the object to be heated. The characteristic information of the heating object may include information on the resonance frequencies of the previously measured heating objects M1 to Mn. When the used object to be heated is detected, the controller 60 may perform an operation of measuring a resonance frequency of the sensed object to be heated, and may store the measured resonance frequency in the memory 70.

The control unit 60 may control the switching unit 21 to provide AC power having a specified frequency to the first heating element 10_1. The designated frequency may be a pre-designated frequency, and the designated frequency may be pre-determined based on the characteristic information of the heating object stored in the memory 70. For example, the controller 60 may extract an intermediate value of the resonant frequencies of the objects to be heated M1 to Mn stored in the memory 70 and determine the specified frequency. Alternatively, for example, the controller 60 may extract a mode from among the resonant frequencies of the objects M1 to Mn stored in the memory 70 to determine the specified frequency.

When the first heating element 10_1 operates at a specified frequency, the control unit 60 may receive a signal corresponding to the temperature of the first heating object 200_1 from the temperature sensor 50, and the first heating element 10_1 ) Output efficiency can be determined. If it is determined that the output efficiency of the first heating element 10_1 is low, the frequency of the AC power supplied to the first heating element 10_1 may be changed to the first resonant frequency.

5 and 6 are flow charts illustrating a method of operating a heating device according to an exemplary embodiment of the present disclosure. In FIG. 6, repeated descriptions of the same reference numerals as in FIG. 5 will be omitted.

Referring to FIGS. 1 and 5, in step S10, the heating device 100 may detect a plurality of disposed objects to be heated. For example, the first heating element 200_1 and the second heating element 200_2 may be disposed on the first heating element 10_1 and the second heating element 10_2, respectively. In this case, the first body to be heated 200_1 may be a container having a first resonant frequency (eg, 21 kHz), and the second body to be heated 200_2 may have a second resonance frequency (eg, 30 kHz). It can be courage.

In step S20, the heating device 100 may operate the first heating element 10_1 and the second heating element 10_2 at a specified frequency. That is, a switching signal having a specified frequency may be generated to provide AC power having a specified frequency to each of the first heating element 10_1 and the second heating element 10_2. By operating the first heating element 10_1 and the second heating element 10_2 at the same frequency, noise generated during the operation of the first heating element 10_1 and the second heating element 10_2 can be reduced.

In this case, the designated frequency may be a value stored in a memory. The designated frequency may be a known frequency of a generally widely used container, or may be a frequency selected based on information on resonant frequencies of the objects to be heated stored in the memory 70 of FIG. 4. For example, the highest resonant frequency among the resonant frequencies of the objects to be heated (M1 to Mn) may be selected as the specified frequency, or the average value of the resonant frequencies of the objects to be heated (M1 to Mn) It can also be selected with this specified frequency. For example, 21 kHz may be selected as the specified frequency.

In step S30, the heating device 100 may detect the temperatures of the first and second objects to be heated 200_1 and 200_2 when a predetermined time elapses. The predetermined time may be a predetermined time or a value stored in a memory.

In step S40, the heating device 100 may determine whether the temperature of each of the first body 200_1 and the second body 200_2 has reached a reference temperature. In this case, the reference temperature may be a value that varies according to a setting output set by a user. For example, the higher the set output, the higher the reference temperature. The reference temperatures of each of the first heating object 200_1 and the second heating object 200_2 may be different from each other or may be the same according to the user's set output.

That is, the heating device 100 may determine whether each of the first heated body 200_1 and the second heated body 200_2 has reached a reference temperature corresponding to the set output after a predetermined time has elapsed according to the set output. I can. When both the first heating target 200_1 and the second heating target 200_2 reach the reference temperature, the heating device 100 supplies power of the specified frequency to the first heating body 10_1 and the second heating body 10_2 Can continue to provide.

On the other hand, when the specified frequency is 21 kHz, the first resonant frequency is relatively close to the specified frequency compared to the second resonant frequency, so the output efficiency of the first heating object 200_1 is lower than that of the second heating object 200_2. I can. The second heating target 200_2 may not reach a reference temperature corresponding to the user's set output. That is, the temperature of the second body to be heated 200_2 may be less than the reference temperature.

However, the present disclosure is not limited thereto, and when the specified frequency is different from both the first resonant frequency and the second resonant frequency, the output efficiency of both the first heating object 200_1 and the second heating object 200_2 is It may be low, and neither of the first body to be heated 200_1 and the second body to be heated 200_2 may reach the reference temperature.

The heating device 100 is in step S50 when the second heating target 200_2 of the first heating target 200_1 and the second heating target 200_2 does not reach a reference temperature corresponding to the set output, A second resonance frequency (eg, 30 kHz) of the second heating target 200_2 that has not reached the reference temperature may be detected. A method of detecting the resonant frequency of the heating object, which varies depending on the inductance value of the heating object, the load resistance value, and the degree of coupling of the inductor to the heating element, may be configured in various ways. Alternatively, when both the first heating target 200_1 and the second heating target 200_2 do not reach the reference temperature corresponding to the user's set output, the first resonance frequency (for example, 21 kHz) and the second resonance It is also possible to detect all frequencies (eg, 30 kHz).

In step S60, the heating device 100 may provide power of the detected second resonance frequency (30 kHz) to each of the first heating element 10_1 and the second heating element 10_2.

In an embodiment, in step S50, when both the first and second resonant frequencies are detected, one of the first and second resonant frequencies is selected and the first heating element 10_1 and the second heating element 10_2 are selected. ) Can provide the power of the selected frequency. For example, among the first and second resonant frequencies, a second resonant frequency having a large difference from the specified frequency may be selected to operate the first heating element 10_1 and the second heating element 10_2.

The heating device according to the present disclosure operates the first heating element 10_1 and the second heating element 10_2 at the same frequency, thereby reducing noise generated during the operation of the first heating element 10_1 and the second heating element 10_2. , It is possible to compensate the efficiency of the heating element, which had low output efficiency.

1 and 6, in step S60a, the heating device 100 may provide power of the detected second resonance frequency to the second heating element 10_2, and the first heating element 10_1 may be turned off. have. Accordingly, when the power of the specified frequency is supplied, the output of the second heating target 200_2, which has relatively low output efficiency, can be compensated.

After performing step S60a for a certain period of time, in step S70, the heating device 100 may again supply power of a specified frequency to the first heating element 10_1 and the second heating element 10_2. The heating device according to the present disclosure operates the first heating element 10_1 and the second heating element 10_2 at the same frequency, thereby reducing noise generated during the operation of the first heating element 10_1 and the second heating element 10_2. By performing step S60a, the output efficiency of the second heating element 10_2, which has low output efficiency, may be compensated.

6 and 7 describe that the first heating element 200_1 and the second heating element 200_2 are disposed on the first heating element 10_1 and the second heating element 10_2, respectively, but this is for convenience of description. It is for, and the heating device according to the present disclosure is not limited thereto. A third heating member other than the first heating member 200_1 and the second heating member 200_2 may be further disposed on the third heating member 10_3. Power of a specified frequency may be provided to the third heating element 10_3 in step S20, and the temperature of the third heating element may be sensed in step S30, and a second resonance frequency to the third heating element 10_3 in step S60 Power can be provided. Alternatively, after the third heating element 10_3 is turned off together with the first heating element 10_1 in step S60a, power of a specified frequency may be provided to the third heating element in step S70.

7 and 8 are flowcharts illustrating a method of operating a heating device according to an exemplary embodiment of the present disclosure. In FIG. 8, redundant descriptions of the same symbols as in FIG. 7 will be omitted.

1 and 7, in step S10, the heating device 100 includes a first heating element 200_1 and a second heating element disposed on the first heating element 10_1 and the second heating element 10_2, respectively. The sieve 200_2 can be detected. In step S15, the heating device 100 is the first resonant frequency (for example, 21 kHz) of the first body to be heated 200_1 and the second resonance frequency (for example, 30 kHz) of the second body to be heated 200_2 ) Can be detected.

In step S20b, the heating device 100 selects a first resonant frequency that is one of the first resonant frequency and the second resonant frequency, and supplies the power of the first resonant frequency to the first heating element 10_1 and the second heating element 10_2 Can be provided. By operating the first heating element 10_1 and the second heating element 10_2 at the same frequency, noise generated during the operation of the first heating element 10_1 and the second heating element 10_2 can be reduced.

In step S30b, the heating device 100 may detect the temperature of the second heating target 200_2 when a predetermined time elapses. The predetermined time may be a predetermined time or a value stored in a memory. In step S30b, the temperature of the first body to be heated 200_1 may also be sensed.

In step S40a, the heating device 100 may determine whether the temperature of the second body to be heated 200_2 has reached the reference temperature. That is, the heating device 100 may determine whether each second heating object 200_2 reaches a temperature corresponding to the set output after a predetermined time has elapsed according to the set output set by the user.

When the temperature of the second heating object 200_2 does not reach the reference temperature corresponding to the set output, in step S60b, the heating device 100 is configured to use the first heating element 10_1 and the second heating element at the second resonance frequency. (10_2) can be operated. That is, a switching signal having a second resonant frequency may be generated to provide AC power having a second resonant frequency to each of the first heating element 10_1 and the second heating element 10_2.

On the other hand, if it is determined that the temperature of the second heating element 200_2 has reached a certain temperature corresponding to the set output, power of the first resonant frequency is continuously provided to the first heating element 10_1 and the second heating element 10_2. You may.

The heating device according to the present disclosure operates the first heating element 10_1 and the second heating element 10_2 at the same frequency, so that noise generated during the operation of the first heating element 10_1 and the second heating element 10_2 can be reduced. have. In addition, the temperature of the first heating element 200_1 and the second heating element 200_2 is measured, and the operating frequencies of the first heating element 10_1 and the second heating element 10_2 are adjusted based on the measured temperature information. By doing so, it is possible to compensate for the efficiency of the heat generating element having low output efficiency.

1 and 8, in step S60c, the heating device 100 may provide power of the detected second resonance frequency to the second heating element 10_2, and the first heating element 10_1 may be turned off. have. Accordingly, when the power of the first resonant frequency is supplied, the output of the second heating target 200_2, which has relatively low output efficiency, can be compensated.

After performing step S60c for a predetermined time, in step S70c, the heating device 100 may again supply power of the first resonance frequency to the first heating element 10_1 and the second heating element 10_2. The heating device according to the present disclosure operates the first heating element 10_1 and the second heating element 10_2 at the same frequency, thereby reducing noise generated during the operation of the first heating element 10_1 and the second heating element 10_2. By performing step S60c, the output efficiency of the second heating element 10_2, which has low output efficiency, may be compensated.

In FIGS. 7 and 8, it is described that the first heating element 200_1 and the second heating element 200_2 are disposed on the first heating element 10_1 and the second heating element 10_2, respectively, but this is for convenience of description. It is for, and the heating device according to the present disclosure is not limited thereto. A third heating member other than the first heating member 200_1 and the second heating member 200_2 may be further disposed on the third heating member 10_3. The heating device may detect the resonant frequency of the third heating element in step S15, and may provide power of the first resonance frequency to the third heating element 10_3 in step S20b. The heating device may sense the temperature of the third heating element in step S30b, and may provide power having a second resonance frequency to the third heating element 10_3 in step S60b. In this case, if it is determined that the third heating element has not reached the reference temperature in step S40b, power having a third resonance frequency may be additionally provided to the first to third heating elements 10_1 to 10_3.

Alternatively, in step S60c, the third heating element 10_3 is turned off together with the first heating element 10_1, and then, in step S70c, the power of the first resonance frequency is provided to the first to third heating elements 10_1 to 10_3. It could be.

The technical idea of the present disclosure described above is not limited to the above-described embodiment and the accompanying drawings. In addition, it will be apparent to those of ordinary skill in the art that various substitutions, modifications and changes are possible within the scope of the technical spirit of the present disclosure.

100: heating device
10_1~10_3: a plurality of heating elements
20_1~20_3: a plurality of driving units
30: power supply
40: user interface
50: temperature sensor
60: control unit
70: memory

Claims (9)

A first heating element for induction heating the first object to be heated;
A second heating element for induction heating a second object to be heated different from the first object to be heated;
A first driving unit providing power to the first heating element;
A second driving unit providing power to the second heating element;
A temperature sensor that generates temperature information according to temperatures of the first and second objects to be heated; And
Includes; a control unit for controlling the first driving unit and the second driving unit,
The control unit,
Controlling the first driving unit and the second driving unit to provide power of a specified frequency to each of the first heating element and the second heating element,
Based on the temperature information, it is determined whether each of the first heating object and the second heating object has reached a reference temperature corresponding to a user's set output,
Detecting a resonance frequency of the second heating object having a temperature less than the reference temperature,
And controlling the second driving unit to provide power at a resonance frequency of the second heating element to the second heating element. The method of claim 1,
The control unit,
While controlling the second driving unit to provide power of the resonant frequency of the second heating element to the second heating element, controlling the first driving unit to provide power of the resonant frequency of the second heating element to the first heating element Heating device, characterized in that. The method of claim 1,
The control unit,
And controlling the first driving unit so that the first heating element is turned off while controlling the second driving unit to provide power at a resonance frequency of the second heating element to the second heating element. The method of claim 3,
The control unit,
After controlling the second driving unit to provide power at the resonance frequency of the second heating element to the second heating element,
And controlling the first driving unit and the second driving unit to supply power of a specified frequency to each of the first heating element and the second heating element. The method of claim 1,
Further comprising a memory in which information on the resonance frequency of each of the different heating targets is stored,
And the control unit selects the designated frequency based on information on the resonance frequency stored in the memory. The method of claim 1,
And a memory in which the designated frequency is stored. A first heating element for induction heating the first object to be heated;
A second heating element for induction heating a second object to be heated different from the first object to be heated;
A first driving unit providing power to the first heating element;
A second driving unit providing power to the second heating element;
A temperature sensor that generates temperature information according to temperatures of the first and second objects to be heated; And
Includes; a control unit for controlling the first driving unit and the second driving unit,
The control unit,
Detecting a first resonant frequency of the first body to be heated and a second resonant frequency of the second body to be heated,
Controlling the first driving unit and the second driving unit to provide power of the first resonant frequency to each of the first heating element and the second heating element,
Based on the temperature information, it is determined whether the second heating object has reached a reference temperature corresponding to a user's set output,
When the second heating element is less than the reference temperature, the heating device, characterized in that controlling the second driving unit to provide the power of the resonant frequency of the second heating element to the second heating element. The method of claim 7,
The control unit,
While controlling the second driving unit to provide power of the resonant frequency of the second heating element to the second heating element, the first driving unit is controlled to provide the power of the second resonant frequency to the first heating element Heating device. The method of claim 7,
The control unit,
And controlling the first driving unit so that the first heating element is turned off while controlling the second driving unit to provide power at a resonance frequency of the second heating element to the second heating element.

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