KR102153499B1 - Heating device and power control method - Google Patents

Abstract

The present invention discloses a heating device. According to a technical idea of the present disclosure, the heating device 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; a first driving unit which provides power to the first heating element; a second driving unit which provides power to the second heating element; a memory in which information on a first designated frequency and information on a second designated frequency having a value higher than the first designated frequency by a specific value are stored; and a control unit which controls the first driving unit and the second driving unit, wherein when the first heating element and the second heating element are sensed, the control unit controls the first driving unit to provide power to the first heating element at a first specified frequency, and controls the second driving unit to provide power to the second heating element at a second specified frequency. The present invention provides the heating device in which noise generated from the heating elements is reduced when a plurality of heating elements operate simultaneously.

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, a heating device according to the technical idea of the present disclosure provides a first heating element for induction heating a first heating element, a second heating element for induction heating a second heating element, and power to the first heating element. A memory storing information on a first driving unit providing power, a second driving unit providing power to the second heating element, information on a first designated frequency, and information on a second designated frequency having a value higher than the first designated frequency by a specific value, and And a control unit for controlling the first driving unit and the second driving unit, and the control unit controls the first driving unit to provide power of a first specified frequency to the first heating unit when the first heating unit and the second heating unit are detected, The second driving unit is controlled to provide power of a second specified frequency to the second heating element.

In an embodiment, a user interface for displaying information on output efficiency of each of the first and second heating targets may be further included.

In one embodiment, when the first and second objects to be heated are detected, the control unit is configured to provide information on the heating object corresponding to the first frequency range including the first specified frequency and the second frequency including the second specified frequency. The user interface may be controlled to display information on the object to be heated corresponding to an area.

In one embodiment, the control unit detects a first resonant frequency of the first heating object and a second resonant frequency of the second heating object, and when the first resonant frequency is excluded from the first frequency range, the first heating object The user interface may be controlled to display output efficiency information for, and when the second resonance frequency is excluded from the second frequency domain, the user interface may be controlled to display output efficiency information for the second heating object.

In an embodiment, the third heating element for induction heating the third heating element and a third driving unit for supplying power to the third heating element are further included, and the controller detects the first to the third heating element, The third driving unit may be controlled to provide power at one of the first designated frequency and the second designated frequency to the third heating element.

In order to achieve the above object, a heating device according to the technical idea of the present disclosure provides a first heating element for induction heating a first heating element, a second heating element for induction heating a second heating element, and power to the first heating element. A memory storing information on a first driving unit providing power, a second driving unit supplying power to a second heating element, information on a first designation frequency, and information on a second designation frequency having a value higher than the first designation frequency by a specific value, And a control unit for controlling the first driving unit and the second driving unit, and the control unit is configured to detect a first resonant frequency of the first heating unit and a second unit to be heated when the first heating unit and the second heating unit are detected. By detecting the resonance frequency and controlling the first driving unit and the second driving unit, the power of the second specified frequency is provided to a heating element that heats the heating object having a high frequency among the first and second resonance frequencies, and the first A power source having a first designated frequency may be provided to a heating element that heats a heating object having a lower frequency among the resonance frequency and the second resonance frequency.

In the heating device according to the technical idea of the present disclosure, when a plurality of heating elements operate at the same time, the plurality of heating elements operate simultaneously by controlling the driving units so that the difference between the driving frequencies of the respective heating elements exceeds the audible frequency of a person. It can reduce the noise generated when. In addition, it is possible to increase the output efficiency of the heating object to be used by providing the user with information on the heating element with low output efficiency and information on the heating element suitable for use according to the resonance frequencies of the heating objects.

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 illustrating a frequency control operation of a heating device according to an exemplary embodiment of the present disclosure.
5 is a flow chart illustrating a method of operating a heating device according to an exemplary embodiment of the present disclosure.
6 is a flow chart illustrating a method of operating a heating device according to an exemplary embodiment of the present disclosure.
7 is a flow chart showing 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 fully describe the present disclosure to those with 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.

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 40 may be disposed above the body to receive a plurality of heating elements 10_1 to 10_3 and a user's input and display status information of the plurality of heating elements 10_1 to 10_3. 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. ) May include a power supply unit 30 for generating electric power, a user interface 40, and a control unit 50 for controlling overall operations of the heating device 100.

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 and the second heating element 10_2 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. However, the present invention is not limited thereto, and the third heating element 10_3 may also be induction, and all of the plurality of heating elements 10_1 to 10_3 included in the heating device 100 may be induction.

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 FIG. 1, the first body to be heated 200_1 and the second body to be heated 200_2 are disposed in the heating device 100, but the third body to be heated may be further disposed on the third heating body 10_3. In addition, when the heating device 100 further includes a fourth heating element, the fourth heating element may be further disposed on the fourth heating element.

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. Each of the first body to be heated 200_1 and the second body to be heated 200_2 may have different sizes of load inductors and load resistances.

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 control unit 50, 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 50, and the second driving unit 20_2 may control the second driving unit 20_1 in response to the control of the control unit 50. 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 50.

In one embodiment, the user interface 40 may be provided on one side of the heating elements 10_1 to 10_3. However, the present invention is not limited thereto, and the user interface 40 may be provided in various shapes inside the heating device 100.

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. The user interface 40 generates 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 on/off operation of the selected heating element, adjustment of driving time and output adjustment, etc. It can be output to the control unit 50.

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 50. 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 output efficiency of each of the first heated body 200_1 and the second heated body 200_2 to the user through the display unit of the user interface 40. have. For example, when it is determined that the output efficiency of at least one of the first and second objects 200_1 and 200_2 to be heated is low, the display of the user interface 40 is Information about the output efficiency of the heating element can be provided. For example, the display unit of the user interface 40 may display a heating element in which a heating object having a relatively low output efficiency is disposed in a visual method and/or an audible method. Alternatively, for example, the display unit of the user interface 40 may display information on an object to be heated suitable for use in each of the simultaneously driven heating elements in a visual method and/or an audible method.

The control unit 50 may generally control the operation of various components in the heating device 100. The control unit 50 may be implemented in various forms such as a CPU (Central Processing Unit), a processor, a microprocessor, an application processor (AP), a microcontroller unit (MCU), a microcomputer, or a mini computer. .

The controller 50 may control the 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 50 may control an output of each of the plurality of heating elements 10_1 to 10_3 based on a user's setting received through the user interface 40.

In one embodiment, the controller 50 may detect the resonant frequency of the heating object when one heating object is disposed on the plate. The control unit 50 may provide power at a resonance frequency to a heating element in which the object to be heated is disposed.

On the other hand, in an embodiment, when a plurality of heating elements (for example, the first heating object 200_1 and the second heating object 200_2) are disposed on the plurality of heating elements, the control unit ( 50) may provide power of a first specified frequency to the first heating element 10_1, and may provide power of a second specified frequency to the second heating element 10_2. In this case, the second designation frequency may have a level higher than the first designation frequency by a specific value. For example, the specific value may be 20 kHz, which is the upper limit of the human audible frequency.

The first operating frequency provided to the first heating element 10_1 and the second operating frequency provided to the second heating element 10_2 do not match each other, and the difference between the first operating frequency and the second operating frequency is within the audible frequency of a person In the case of, noise may be generated. Therefore, when the first heating element 10_1 and the second heating element 10_2 are simultaneously driven, the control unit 50 sets the difference between the first operating frequency and the second operating frequency to be equal to or greater than the human audible frequency, 100) can be reduced.

When the first heating element 10_1 operates at a first designated frequency and the second heating element 10_2 operates at a second designated frequency, the control unit 50 controls the first heating element 200_1 and the second heating object 200_2. If it is determined that the output efficiency of) is low, the user interface 40 may be controlled to guide the user to the object to be heated with low output efficiency. For example, the control unit 50 determines whether the first resonant frequency f1 of the first heating object 200_1 is included in the first frequency region including the first designated frequency, or the second heating object 200_2 By determining whether the second resonant frequency f2 is included in the second frequency region including the second designated frequency, the output efficiency of each of the first heating object 200_1 and the second heating object 200_2 can be determined. I can. Based on the determination result, the controller 50 may control the user interface 40 to provide the user with information on the object to be heated with low output efficiency. Accordingly, the heating apparatus 100 according to the present disclosure may provide information on an object to be heated with low output efficiency to the user, and may guide the user to change and use the object to be heated with high output efficiency.

In one embodiment, the heating device 100 may further include a temperature sensor that detects the temperature of the object to be heated. The temperature sensor may detect the temperatures of the first and second objects to be heated 200_1 and 200_2, and the detected temperature of each of the first and second objects to be heated 200_1 and 200_2 A signal corresponding to may be transmitted to the controller 50. In one embodiment, the temperature sensor may detect the temperature of the first heating object 200_1 and the second heating object 200_2 in a non-contact manner. For example, the temperature sensor detects infrared rays to measure the temperature. It may be a sensor of a detection method. Alternatively, in one embodiment, the temperature sensor detects the temperature of the first heating target 200_1 and the second heating target 200_2 by contacting the first heating target 200_1 and the second heating target 200_2 You may. When the first heating element 10_1 operates at a first designated frequency and the second heating element 10_2 operates at a second designated frequency, the control unit 50 controls the first heating element 200_1 and the second heating object 200_2. ), it is also possible to determine the output efficiency of the first heating target 200_1 and the second heating target 200_2 based on the respective temperature information.

However, in this drawing, a case in which the first heating element 10_1 and the second heating element 10_2 are induction has been described, but the present disclosure is not limited thereto. When the heating device 100 includes three or more inductions and drives three or more inductions at the same time, the heating device 100 may match the operating frequencies of at least two inductions among the plurality of inductions to a first designated frequency. In addition, power of a second designated frequency may be provided to at least one other induction.

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 illustrating a frequency control operation of 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 object 200_1 is placed, but this is only for convenience of description, and the second heating element 10_2 or the second heating element 10_2 on which the second heating object 200_2 is placed 3 The same description can be applied to the third heating element on which the object to be heated is placed. In addition, in FIG. 3, the first driving unit 20_1 driving the first heating element 10_1 is shown, but the second driving unit 20_2 driving the second heating element 10_2 and the third driving unit 10_3 are 3 The same description may be applied to the driving unit 20_3.

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 50. 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 50, 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 50. 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 the first resonance frequency f1 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 f1, the output efficiency of the first heating object 200_1 may be lowered. The first resonant frequency f1 is the inductance value L_load of the first heating element 200_1, the load resistance value R_load, and the degree of coupling of the inductor between the first heating element 10_1 and the first heating element 200_1 Can be determined by

On the other hand, the second heating object 200_2 shown in FIG. 1 may operate at maximum power efficiency when power having a second resonance frequency f2 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 f2, the output efficiency of the second heating object 200_2 may decrease. The second resonant frequency f2 may be determined by an inductance value and 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 f1 and the second resonance frequency f2 may have different values.

The memory 60 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 50 may be stored in the memory 60. The memory 60 may include at least one of a nonvolatile memory such as a flash memory and a magneto-resistive memory, and a volatile memory such as DRAM and SRAM. The memory 60 may be implemented as hardware separate from the controller 50, but is not limited thereto. For example, when the controller 50 is implemented as a microcomputer or a mini-computer, the memory 60 may be implemented as a piece of hardware with the controller 50.

When the first heating object 200_1 is detected on the first heating element 10_1, the controller 50 may perform an operation of measuring a resonance frequency of the sensed heating object. In one embodiment, the control unit 50 may analyze the waveform of the resonance current flowing through the first heating element 10_1 and follow the resonance point through zero voltage switching (ZVS) control, and switch according to the tracking result. By controlling the unit 21, the first resonance frequency f1 can be detected. However, the heating device 100 of the present disclosure is not limited thereto, and may detect the first resonance frequency f1 of the first heating element 10_1 and the resonance frequency of the other heating element in various ways.

The controller 50 may control the switching operation of the switching unit 21 to adjust the frequency and/or duty ratio of the AC power output from the switching unit 21. The control unit 50 may control the switching operation of the switching unit 21 to adjust the operating frequency of the first heating element 10_1, and the induction heating output of the first heating element 10_1 can be adjusted as the operating frequency is controlled. have. In one embodiment, the control unit 50 controls the switching operation of the switching unit 21 so that the first heating element 10_1 is driven at one of a first designated frequency (f_d1) and a second designated frequency (f_d2). can do.

3 and 4, in one embodiment, a memory 60 includes a first designated frequency (f_d1), a first frequency domain (fr1), a second designated frequency (f_d2), and a second frequency domain (fr2). ) Can be stored. The first designation frequency f_d1 and the second designation frequency f_d2 may have a difference by a specific value Δf_a. In one embodiment, the specific value Δf_a may be the upper limit of the human audible frequency, for example, 20 kHz.

The control unit 50 determines the first resonant frequency f1 of the first heating object 200_1 based on the information on the first frequency region fr1 and the second frequency region fr2 stored in the memory 60. It may be compared with one of the first frequency domain fr1 and the second frequency domain fr2. That is, the control unit 50 determines whether the first resonant frequency f1 of the first heating object 200_1 is included in the first frequency region fr1 or the first resonant frequency of the first heating object 200_1 It may be determined whether (f1) is included in the second frequency domain fr2.

The first designated frequency f_d1 may be included in the first frequency domain fr1, and the second designated frequency f_d2 may be included in the second frequency domain fr2. The first frequency domain fr1 refers to a range of the resonance frequency of the heating object suitable for use in the first heating element 10_1 when the first heating element 10_1 is driven at the first designated frequency f_d1. The second frequency region fr2 is a range of the resonance frequency of the heating object suitable for use in the first heating element 10_1 when the first heating element 10_1 is driven at the second specified frequency f_d2. Can mean In an embodiment, when a heating object having a resonant frequency included in a frequency region fr_e other than the first frequency region fr1 and the second frequency region fr2 is disposed on the first heating element 10_1, The controller 50 may determine that the output efficiency of the heating object is low and control the user interface 40 to notify the user. For example, the first frequency region fr1 may include a frequency of 35 kHz or more, and the second frequency region fr2 may include a frequency of 30 kHz or less. However, the present disclosure is not limited to those shown in the drawings. That is, there is no frequency domain fr_e other than the first frequency domain fr1 and the second frequency domain fr2, and the first frequency domain fr1 and the second frequency domain fr2 are configured to be continuous with each other. May be.

In an embodiment, the memory 60 may further store characteristic information of the object to be heated. The information on the characteristics of the heating target may include information on the resonance frequencies of the heating targets previously measured. The control unit 50 displays information on an object to be heated having a resonant frequency close to the first specified frequency f_d1 or the second specified frequency f_d2, based on the characteristic information of the heating object stored in the memory 60. The user interface 40 can be controlled.

5 is a flow chart illustrating a method of operating a heating device according to an exemplary embodiment of the present disclosure.

Referring to FIGS. 1 and 5, in step S10, the heating device 100 may detect a plurality of objects to be heated disposed on a plate. For example, the first heating body 200_1 and the second heating body 200_2 may be disposed on the first heating body 10_1 and the second heating body 10_2, respectively, and the heating device 100 Can be detected.

In step S20, the heating device 100 may visually and/or audibly provide information on the first frequency domain and the second frequency domain to the user. For example, the heating device 100 is the first frequency so that the user can use the heating element having a resonant frequency in the first frequency region (for example, fr1 in FIG. 3) on the first heating element 10_1 Information on an object to be heated having a resonant frequency included in the region fr1 may be visually and/or aurally provided to the user. In addition, for example, the heating device 100 so that the user can use the heating element having a resonant frequency in the second frequency region (for example, fr2 in FIG. 3) on the second heating element 10_2 2 Information on an object to be heated having a resonant frequency included in the frequency domain may be visually and/or aurally provided to the user.

That is, the heating device 100 is based on the information on the first frequency region fr1 and the second frequency region fr2 stored in the memory (for example, 60 in FIG. 3), the first heating element 10_1 and Information on an object to be heated suitable for use in each of the second heating elements 10_2 may be provided to the user. Since the second frequency region is formed in a region higher than the first frequency region, the heating device 100 uses an element to be heated having a relatively high resonant frequency on the second heating element 10_2 and on the first heating element 10_1. The user can be guided to use an object to be heated having a relatively low resonance frequency.

In step S30, the heating device 100 provides power at a first designated frequency (eg, f_d1 in FIG. 3) to the first heating element 10_1, and a second designated frequency (eg, f_d2 in FIG. 3). ) May be provided to the second heating element 10_2. In this case, the second designation frequency f_d2 may have a level higher than the first designation frequency f_d1 by a specific value. For example, the specific value may be 20 kHz, which is the upper limit of the human audible frequency. Accordingly, the heating device 100 according to the present disclosure may reduce noise that may occur as a plurality of heating elements, that is, the first heating element 10_1 and the second heating element 10_2 operate simultaneously.

In one embodiment, when the third heating element is additionally sensed on the third heating element 10_3 in step S10, in step S30, the heating device 100 is at one of the first designated frequency and the second designated frequency. The power of may be provided to the third heating element 10_3. Therefore, even if three or more heating elements (for example, the first heating element 10_1, the second heating element 10_2, and the third heating element 10_3) are driven at the same time, the heating device 100 according to the present disclosure The difference between the frequencies at which they are driven is 0, or a specific value, that is, more than an audible frequency range. The heating device 100 may reduce noise that may occur as three or more heating elements operate simultaneously.

6 is a flow chart illustrating a method of operating a heating device according to an exemplary embodiment of the present disclosure.

Referring to FIGS. 1 and 6, in step S10, the heating device 100 may detect a plurality of objects to be heated disposed on a plate. For example, the first heating body 200_1 and the second heating body 200_2 may be disposed on the first heating body 10_1 and the second heating body 10_2, respectively, and the heating device 100 Can be detected.

In step S11, the heating device 100 may detect a resonance frequency of each of the plurality of objects to be heated. For example, the heating device 100 may detect a first resonant frequency f1 of the first body to be heated 200_1 and a second resonant frequency f2 of the second body to be heated 200_2. A method of detecting the resonance frequency of each of the heating targets, which varies depending on the inductance value of each of the heating targets, the load resistance value, and the degree of coupling of the inductor to the heating member, may be variously configured. The heating device 100 may store the detected first resonance frequency f1 and second resonance frequency f2 in a memory (eg, 60 of FIG. 3 ).

In step S13, the heating device 100 may determine whether the first resonant frequency f1 of the first heating object 200_1 is included in the first frequency region (eg, fr1 in FIG. 3 ). If the first resonant frequency f1 is not included in the first frequency region fr1, the heating device 100 visually and/or informs the user that the output efficiency of the first heating object 200_1 is low in step S17. Can be informed audibly.

In step S15, the heating device 100 may determine whether the second resonant frequency f2 of the second heating target 200_2 is included in the second frequency region (eg, fr2 in FIG. 3 ). If the second resonant frequency f2 is not included in the second frequency region fr2, the heating device 100 visually and/or informs the user that the output efficiency of the second heating object 200_2 is low in step S17. Can be informed audibly.

In step S30, the heating device 100 provides power at a first designated frequency (eg, f_d1 in FIG. 3) to the first heating element 10_1, and a second designated frequency (eg, f_d2 in FIG. 3). ) May be provided to the second heating element 10_2.

As the operating frequency of the first heating element 10_1 is closer to the first resonance frequency f1, the output efficiency of the first heating element 200_1 may increase. Accordingly, the heating device 100 checks whether the first resonant frequency f1 is included in the first frequency region fr1 including the first designated frequency f_d1. When the heating element 10_1 operates, the output efficiency of the first heating object 200_1 may be determined. For the same reason, the heating device 100 checks whether the second resonant frequency f2 is included in the second frequency region fr2 including the second designated frequency f_d2, so that the second designated frequency f_d2 is determined. 2 When the heating element 10_2 operates, the output efficiency of the second heating object 200_2 may be determined.

In addition, the heating device 100 is based on the information on the resonant frequencies of the objects to be heated stored in the memory 60, the heating object having a resonant frequency close to the first specified frequency (f_d1) and / or the second designation Information on an object to be heated having a resonant frequency close to the frequency f_d2 may be visually and/or aurally provided to the user.

7 is a flow chart showing a method of operating a heating device according to an exemplary embodiment of the present disclosure.

Referring to FIGS. 1 and 7, in step S10, the heating device 100 may detect a plurality of objects to be heated disposed on a plate. For example, the first heating body 200_1 and the second heating body 200_2 may be disposed on the first heating body 10_1 and the second heating body 10_2, respectively, and the heating device 100 Can be detected.

In step S11, the heating device 100 may detect a resonance frequency of each of the plurality of objects to be heated. For example, the heating device 100 may detect a first resonant frequency f1 of the first body to be heated 200_1 and a second resonant frequency f2 of the second body to be heated 200_2. A method of detecting the resonance frequency of each of the heating targets, which varies depending on the inductance value of each of the heating targets, the load resistance value, and the degree of coupling of the inductor to the heating member, may be variously configured. The heating device 100 may store the detected first resonance frequency f1 and second resonance frequency f2 in a memory (eg, 60 of FIG. 3 ).

In step S12, the heating device 100 may compare the magnitudes of the first resonance frequency f1 and the second resonance frequency f2. Based on the comparison result, in step S30a, the heating device 100 provides power at a second designated frequency (for example, f_d2 in FIG. 3) to the heating element in which the heating object having a relatively high resonance frequency is disposed, and , Power having a first designated frequency (eg, f_d1 in FIG. 3) may be provided to a heating element in which a heating object having a relatively low resonance frequency is disposed.

In order to reduce noise that may occur when a plurality of heating elements, for example, the first heating element 10_1 and the second heating element 10_2 operate at the same time, the heating device 100 according to the present disclosure is It is possible to operate at different frequencies with a frequency difference exceeding In order to increase output efficiency, the heating device 100 is relatively high among a plurality of heating targets disposed on a plate, for example, the first heating target 200_1 and the second heating target 200_2. Power having a second specified frequency f_d2 may be provided to the second heating element 10_2 on which the second heating object 200_2 having the second resonance frequency f2 is placed. On the other hand, the heating device 100 may provide power of the first designated frequency f_d1 to the first heating element 10_1 on which the first heating object 200_1 having a relatively low first resonance frequency f1 is placed. have.

Unlike that shown in FIG. 7, the heating device 100 has a first resonant frequency f1 and a second resonant frequency f2, respectively, in a first frequency region (for example, fr1 in FIG. 3) and a second frequency region. (For example, it may be checked whether it is included in one of the regions of fr2 in FIG. 3), and the power of a specified frequency corresponding to the included frequency region is provided to each of the first heating element 10_1 and the second heating element 10_2. I can.

For example, when the first resonant frequency f1 is included in the first frequency region fr1, the heating device 100 may provide power of the first designated frequency f_d1 to the first heating element 10_1. In addition, when the second resonant frequency f2 is included in the first frequency region fr1, power of the first designated frequency f_d1 may be provided to the second heating element 10_2. Alternatively, when the first resonant frequency f1 is included in the second frequency region fr2, the heating device 100 may provide power of the second specified frequency f_d2 to the first heating element 10_1, When the second resonant frequency f2 is included in the second frequency region fr2, power of the second specified frequency f_d2 may be provided to the second heating element 10_2. That is, the heating device 100 is based on the first resonance frequency (f1) and the second resonance frequency (f2), the same frequency (for example, the first heating element 10_1 and the second heating element 10_2) Power of a designated frequency (f_d1) and a second designated frequency (f_d2) selected from among) may be provided.

On the other hand, when the first resonant frequency f1 is included in the first frequency region fr1, the heating device 100 may provide power of the first designated frequency f_d1 to the first heating element 10_1, and 2 When the resonance frequency f2 is included in the second frequency region fr2, power of the second specified frequency f_d2 may be provided to the second heating element 10_2. Alternatively, when the first resonant frequency f1 is included in the second frequency region fr2, the heating device 100 may provide power of the second designated frequency f_d2 to the first heating element 10_1, and 2 When the resonance frequency f2 is included in the first frequency region fr1, power of the first specified frequency f_d1 may be provided to the second heating element 10_2. That is, the heating device 100 may provide power of different frequencies to the first heating element 10_1 and the second heating element 10_2 based on the first resonance frequency f1 and the second resonance frequency f2. have.

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.

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: control unit
60: memory

Claims (6)

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;
A first driving unit providing power to the first heating element;
A second driving unit providing power to the second heating element;
A user interface that displays information on output efficiency of each of the first and second objects to be heated;
In a first designated frequency, a second designated frequency having a value higher than the first designated frequency by a specific value, a first frequency region including the first designated frequency, and a second frequency region including the second designated frequency A memory for storing information about it; And
Includes; a control unit for controlling the first driving unit and the second driving unit,
The control unit,
When the first heating element and the second heating element are sensed, the first resonant frequency of the first heating element and the second heating element are analyzed by analyzing the waveforms of the current flowing through the first heating element and the second heating element. Detect the second resonant frequency of,
Controlling the first driving unit to provide power of the first specified frequency to the first heating element, and controlling a second driving unit to provide power of the second specified frequency to the second heating element,
When the second resonant frequency is excluded from the second frequency region, the heating device, characterized in that for controlling the user interface to indicate that the output efficiency of the second heating element is low. The method of claim 1,
The memory stores information on resonant frequencies of different heating objects,
The control unit controls a user interface to provide information on an object to be heated having a resonant frequency closest to the second designated frequency instead of the second object to be heated based on the information on the resonant frequency stored in the memory. Heating device characterized in that. The method of claim 1,
The control unit,
When the first body to be heated and the second body to be heated are detected, controlling the user interface to display information on the body to be heated corresponding to the first frequency domain and information on the body to be heated corresponding to the second frequency domain Heating device, characterized in that. The method of claim 1,
The control unit,
When the first resonant frequency is excluded from the first frequency range, the user interface is controlled to indicate that the output efficiency of the first heating element is low. The method of claim 1,
A third heating element for induction heating a third object to be heated; And
Further comprising; a third driving unit for providing power to the third heating element,
The control unit controls the third driving unit to provide power at one of the first and second designated frequencies to the third heating element when the first to the third heated body is detected. Heating device, characterized in that. 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;
A first driving unit providing power to the first heating element;
A second driving unit providing power to the second heating element;
A user interface that displays information on output efficiency of each of the first and second objects to be heated;
A first designated frequency, a second designated frequency having a value higher by a specific value than the first designated frequency, a first frequency region including the first designated frequency, and a second frequency region including the second designated frequency A memory for storing information about it; And
Includes; a control unit for controlling the first driving unit and the second driving unit,
The control unit,
When the first heating element and the second heating element are detected, the first resonant frequency of the first heating element and the second heating element are analyzed by analyzing the waveforms of the current flowing through the first heating element and the second heating element. Detect the second resonance frequency of,
By controlling the first driving unit and the second driving unit, the power of the second specified frequency is provided to a heating element that heats a heating element having a high frequency among the first and second resonance frequencies, and the first Provides a power of the first specified frequency to a heating element for heating the heating element of the lower frequency of the resonance frequency and the second resonance frequency,
And controlling the user interface to indicate that the output efficiency of the second heating element is low when a high frequency among the first resonance frequency and the second resonance frequency is excluded from the second frequency range.

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