WO2023214660A1

WO2023214660A1 - Electronic device performing dielectric heating and operating method thereof

Info

Publication number: WO2023214660A1
Application number: PCT/KR2023/003025
Authority: WO
Inventors: 고태동; 김지훈; 조민식; 최보환; 최진수; 유영호
Original assignee: 삼성전자 주식회사
Priority date: 2022-05-04
Filing date: 2023-03-06
Publication date: 2023-11-09

Abstract

An electronic device, according to one embodiment, may comprise: at least one capacitor; a coil connected to at least a portion of the at least one capacitor; a driving device including a structure for adjusting the length of the coil; a source that supplies AC power to the at least one capacitor; a detector configured to detect a phase difference between an output voltage and an output current of the source; and a controller. The controller may control the source so as to supply a first power for heating food disposed between electrodes constituting the at least one capacitor while the structure of the driving device is in a first state. The coil may be of a first length while the structure of the driving device is in the first state. The controller may check the phase difference between the output voltage and the output current detected by the detector while the first power is supplied. The controller may be configured to cause the driving device to change the structure of the driving device from the first state to a second state different from the first state on the basis of the phase difference while controlling the source so as to maintain the supply of the first power. While the structure of the driving device is in the second state, the coil may be of a second length different from the first length.

Description

Electronic devices that perform dielectric heating and their method of operation

The present disclosure relates to electronic devices that perform dielectric heating and methods of operating the same.

Dielectric heating is a technology that heats objects using a short-range electric field. When a high-frequency power of several tens of MHz is applied to an object (e.g., a heated object), a high-frequency electric field is generated, causing the polar molecules in the object to rotate or vibrate, and the object is heated due to the movement of the polar molecules. Dielectric heating technology is similar to the principle of a conventional microwave oven, but the electronic device that performs dielectric heating is driven at a lower frequency than that used in the microwave oven, so the penetration depth of heat becomes deeper and uniform heating is possible. Using its uniform heating properties, it can be applied to food care (e.g. thawing, ripening, drying, sterilization), clothing care (e.g. drying), skin care, advanced drying, or carbon capture. Microwave ovens use electric fields in the GHz band, so moisture loss may occur due to evaporation. In particular, due to uneven heating, certain parts of the food may be heated, but other parts may be insufficiently heated. An electronic device that performs dielectric heating can use an RF electric field in the MHz band to move the molecules of the food material itself rather than heating moisture, thereby enabling uniform heating.

An electronic device that performs dielectric heating can heat food using an electromagnetic field of a specified frequency. The electronic device may include a resonant circuit, and the resonant circuit may have a resonant frequency corresponding to a specified frequency. However, the resonant frequency of the resonant circuit may change depending on at least one of the type of food to be heated, the moisture content contained in the food, or the temperature. The changed resonant frequency may be different from the specific frequency of the electromagnetic field, which may cause a decrease in heating efficiency.

An electronic device and a method of operating the same according to an embodiment may adaptively change the resonance frequency based on a change in the characteristics of the food being heated.

According to one embodiment, the electronic device includes at least one capacitor, a coil connected to at least a portion of the at least one capacitor, a driving device including a structure for adjusting the length of the coil, and an alternating current applied to the at least one capacitor. It may include a source providing power, a detector configured to detect a phase difference between the output voltage and output current of the source, and the controller. The controller controls the source to provide first power for heating food disposed between electrodes constituting the at least one capacitor while the state of the structure of the driving device is in a first state. You can. The coil may be at a first length while the state of the structure of the drive device is in the first state. The controller may check the phase difference between the output voltage and the output current detected by the detector while the first power is being provided. The controller changes the state of the structure of the drive device from the first state to a second state different from the first state based on the phase difference while controlling the source to maintain provision of the first power. It can be set to control the driving device to do so. The coil may be of a second length different from the first length while the state of the structure of the drive device is in the second state.

According to one embodiment, at least one capacitor, a coil connected to at least a portion of the at least one capacitor, a driving device including a structure for adjusting the length of the coil, and providing alternating current power to the at least one capacitor A method of operating an electronic device comprising a source and a detector configured to detect a phase difference between an output voltage and an output current of the source, the method comprising: while the state of the structure of the drive device is in a first state, the at least one The method may include controlling the source to provide first power for heating food disposed between electrodes constituting a capacitor. The coil may be at a first length while the state of the structure of the drive device is in the first state. The method of operating the electronic device may include checking the phase difference between the output voltage and the output current detected by the detector while the first power is being provided. The method of operating the electronic device includes controlling the source to maintain provision of the first power, and changing the state of the structure of the driving device from the first state to a second state different from the first state based on the phase difference. Controlling the driving device to change between two states may include operations. The coil may be of a second length different from the first length while the state of the structure of the drive device is in the second state.

According to one embodiment, an electronic device and a method of operating the same may be provided that can adaptively change the resonance frequency based on a change in the characteristics of the food being heated. Accordingly, the possibility of a decrease in heating efficiency may be reduced.

FIG. 1A is a diagram for explaining an example operation of an electronic device that performs dielectric heating according to an embodiment.

Figure 1b shows dielectric constants at different frequencies for each of the various temperatures of water molecules.

2A is an example block diagram of an electronic device that performs dielectric heating according to one embodiment.

FIG. 2B shows a circuit diagram corresponding to an electronic device and food accommodated by the electronic device, according to an embodiment.

FIG. 2C is a diagram for explaining at least one exemplary capacitor according to an embodiment.

FIG. 2D is a diagram for explaining at least one exemplary capacitor according to an embodiment.

Figure 2E shows a coil according to one embodiment.

FIG. 3 illustrates a flowchart for explaining an exemplary operating method of an electronic device according to an embodiment.

FIG. 4 illustrates a flowchart for explaining an exemplary operating method of an electronic device according to an embodiment.

FIG. 5 illustrates a flowchart for explaining an exemplary operating method of an electronic device according to an embodiment.

FIG. 6 illustrates a flowchart for explaining an exemplary operating method of an electronic device according to an embodiment.

FIG. 7A shows a flowchart for explaining an example operating method of an electronic device according to an embodiment.

7B shows waveforms of output voltage and output current according to one embodiment.

Figure 8A shows a block diagram of an example electronic device according to one embodiment.

FIG. 8B is a diagram for explaining the operation of an exemplary timing analyzer according to an embodiment.

FIG. 8C is a diagram for explaining the operation of an exemplary priority analyzer according to an embodiment.

FIG. 9A is a diagram for explaining a change in the length of an exemplary coil according to an embodiment.

FIG. 9B is a diagram illustrating a change in the length of an exemplary coil according to an embodiment.

FIGS. 10A, 10B, 10C, 10D, 10E, and 10F are diagrams for explaining an exemplary driving device according to an embodiment.

An electronic device 101 that performs dielectric heating according to an embodiment may include a source 110 and a plurality of

electrodes

121 and 122. The source 110 may provide alternating current power to the first electrode 121 and the second electrode 122. Depending on the provision of alternating current power, the polarity of the potential applied to the first electrode 121 and the second electrode 122 may change. For example, during the first period, a positive potential may be applied to the first electrode 121 and a negative potential (or zero potential) may be applied to the second electrode 122, and during the second period, the second electrode 121 may be applied to the first electrode 121. A positive potential may be applied to the electrode 122 and a negative potential (or a potential of 0) may be applied to the first electrode 121. As described above, repetition of changes in the polarity of the potential may cause repetition of changes in the direction of the electric field formed between the

electrodes

121 and 122. As the direction of the electric field is repeatedly changed, the molecules 140 located between the

electrodes

121 and 122 may generate rotational and/or oscillatory movements due to a change in the direction in which they are oriented. The rotational and/or vibrational motion of the molecules 140 may cause an increase in the kinetic energy of the molecules, that is, an increase in temperature. Uniform heating of the entire food may be possible according to the rotational movement and/or vibrational movement of the water molecules in the food and/or other types of polar molecules constituting the food.

As will be described in more detail later, the

electrodes

121 and 122 may form a capacitor, and the capacitor and the coil (not shown) may form a resonance circuit. More specifically, the

electrodes

121 and 122 may constitute a capacitor of two conductor plates, and in the case where there is no food, the dielectric constant of the capacitor may be that of air. Meanwhile, when food is placed between the

electrodes

121 and 122, the dielectric constant of the capacitor may be determined according to the type of food, the moisture content in the food, and/or the temperature of the food. Heating efficiency may be high when the resonant frequency of the resonant circuit is preferably the same as the frequency of the signal provided from the source 110. However, depending on the type of food molecule, moisture content, and/or temperature of the food, the dielectric constant may change. Changes in dielectric constant cause changes in capacitance and therefore may cause changes in the resonant frequency of the resonant circuit. Figure 1b shows dielectric constants (131, 132, 133, 134, 135) at each frequency for various temperatures of water molecules. As shown in FIG. 1B, even one type of molecule (for example, a water molecule) may have a different dielectric constant depending on temperature, and thus it can be confirmed that a change in temperature causes a change in dielectric constant. In addition, foods contain, in addition to water molecules, various components such as glucose, starch, lactose, protein, salt, caseinate, and/or commercial mixtures. Molecules may be included, and the dielectric constants of each molecule may be different. In addition, the dielectric constant of each molecule may also change depending on temperature. Accordingly, the capacitance may change depending on the type of food placed between the

electrodes

121 and 122, moisture content, and/or temperature. Changes in capacitance can cause changes in the resonant frequency of the resonant circuit. As the resonance frequency changes, there is a possibility that heating efficiency may decrease. The electronic device 101 according to various embodiments may reduce the possibility of a decrease in heating efficiency by adaptively changing the resonance frequency in response to a change in capacitance (or performing impedance matching).

2A is an example block diagram of an electronic device that performs dielectric heating according to one embodiment. The embodiment of FIG. 2A will be described with reference to FIG. 2B. FIG. 2B shows a circuit diagram corresponding to an electronic device and food accommodated by the electronic device, according to an embodiment.

According to one embodiment, the electronic device 101 includes a source 201, at least one capacitor 203, a coil 205, a drive device 207, a controller 209, and/or a detector 211. It can be included.

According to one embodiment, the source 201 may provide alternating current power with a frequency of fs. The source 201 may include, for example, an oscillator, a DC/DC converter, and/or an amplifier to provide alternating current power, and there is no limitation on the form of implementation of the source 201. For example, the source 201 may provide alternating current power under the control of the controller 209. The controller 209 may control, for example, the size of AC power. The controller 209 may control, for example, the frequency (fs) of alternating current power. The controller 209 may control the magnitude and/or frequency (fs) of the alternating current power, for example, based on the type of food and/or heating mode, but there is no limitation.

According to one embodiment, at least one capacitor 203 and the coil 205 may form a resonance circuit. The resonant circuit may have a resonant frequency that depends on the capacitance of at least one capacitor 203 and the inductance of the coil 205. For example, the electronic device 101 may include at least one

capacitor

203a and 203b connected to the source 201, as shown in FIG. 2B. At least one capacitor (203a, 203b) is shown as two in the embodiment of FIG. 2B, but this is an example and there is no limit to the number of capacitors, and one capacitor may be included in the electronic device 101. Alternatively, three or more capacitors may be included in the electronic device 101. The capacitor 203a may form a first resonance circuit with the coil 205, and the capacitor 203b may form a second resonance circuit with the coil 205. The first resonance circuit and the second resonance circuit may preferably have a resonance frequency equal to the frequency (fs) of the alternating current power provided from the source 201. Meanwhile, it is merely an example that each of the

capacitors

203a and 203b constitutes the coil 205 and a plurality of resonance circuits, and the

capacitors

203a and 203b and the coil 205 constitute one resonance circuit. Those skilled in the art will understand that modifications to the design are also possible. The capacitance of each of the

capacitors

203a and 203b may be C1 and C2, and the capacitance may be the same, but may differ depending on implementation. Meanwhile, the

resistors

231 and 232 in the circuit diagram may correspond, for example, to food disposed between at least one

capacitor

203a and 203b. A potential of VC1 may be applied to the capacitor 203a, and a potential of VC2 may be applied to the capacitor 203b. A current i1 may flow in the capacitor 203a, a current i2 may flow in the capacitor 203b, and a current i1-i2 may flow in the coil 205. The resonant frequency may be, for example, equal to Equation 1.

In Equation 1, L may be inductance and C may be capacitance. The first resonance circuit formed by the capacitor 203a and the coil 205 is

It may have a first resonance frequency, and the second resonance circuit formed by the capacitor 203b and the coil 205 is

It may have a second resonant frequency of For example, the first resonant frequency and the second resonant frequency may be the same, but may be different depending on changes in capacitance depending on the environment. Meanwhile, the

capacitors

203a and 203b and the coil 205 may be implemented as one resonance circuit, and the resonance frequency may be

It can also be set to . In this case, the frequency fs of the alternating current power from the source 201 is the resonant frequency.

It can also be set to . The frequency (fs) of alternating current power is, e.g.

,

, or

Any one of the options can be selected, but there is no limitation. As described above, the capacitance changes based on the type of food, moisture content, and/or temperature disposed between the electrodes (e.g., electrodes 121 and 122) constituting the at least one capacitor 203. may be, and accordingly, the resonance frequency of the resonance circuit of Equation 1 may also be changed. Accordingly, there is a possibility that the resonant frequency may be different from the frequency (fs) of the alternating current power provided from the source 201. The difference in the resonant frequency and the frequency (fs) of the alternating current power may cause a phase difference between the voltage and current of the source 201. For example, in FIG. 2B, each of the voltage Vin and current Iin of the source 201 may be alternating current waveforms, and a phase difference may occur between the alternating current waveforms. The difference between the frequency (fs) of the alternating current power and the resonant frequency may cause a phase difference, and the phase difference may cause a decrease in heating efficiency. Accordingly, the electronic device 101 may adjust the inductance of the coil 205 so that the phase difference between the voltage Vin and the current Iin remains substantially 0. By adjusting the inductance, the resonant frequency of the resonant circuit in Equation 1 can be changed, and the phase difference between the voltage Vin and the current Iin can be controlled to be substantially zero. Here, those skilled in the art will understand that the phase difference between the voltage (Vin) and the current (Iin) being substantially zero may mean that the phase difference between the voltage (Vin) and the current (Iin) is less than or equal to the critical phase difference. will be.

As described above, the electronic device 101 adjusts the inductance of the coil 205 such that the phase difference between the voltage Vin and the current Iin is substantially zero (or less than a critical phase difference). You can. The detector 211 may detect the phase difference between the voltage Vin and the current Iin and provide the detected phase difference to the controller 209. The detector 211 may detect information related to the precedence of the phase of the voltage Vin and the phase of the current Iin and provide the information to the controller 209. Detector 211 determines the phase difference between voltage Vin and current Iin for a point within electronic device 101 (e.g., but not limited to a point connected to a terminal of source 201) and/ There is no limitation as long as it is a means that can provide information related to the lead, and example implementations will be described in more detail with reference to FIGS. 8A to 8C. The controller 209 may control the driving device 207 to adjust the inductance of the coil 205 based on the phase difference between the voltage Vin and current Iin provided from the detector 211. The drive device 207 is not limited as long as it includes, for example, at least one device and/or structure for changing the physical shape of the coil 205, example implementations are further detailed with reference to FIGS. 10A-10F. Please explain clearly. Changes in the physical shape of the coil 205 may cause changes in inductance. Those skilled in the art will understand that changes in the physical shape of the coil 205 in this document can be used interchangeably with changes in the inductance of the coil 205. The controller 209 directs the drive device 207 to adjust the inductance of the coil 205 based on information associated with the lead in phase of the voltage Vin and the phase of the current Iin provided from the detector 211. You can control it.

In one example, the controller 209 provides first association information between the phase difference of voltage Vin and current Iin and the degree of change of coil 205 (or control parameter of drive device 207). For reference, the degree of change of the coil 205 (or the control parameter of the driving device 207) corresponding to the confirmed phase difference can be confirmed. The controller 209 may control the driving device 209 based on the confirmed degree of change (or control parameter of the driving device 207). The controller 209 determines by referring to the second association information between the information associated with the lead of the phase of the voltage Vin and the phase of the current Iin and the direction of change (or the control parameter of the driving device 209). The change direction of the coil 205 (or the control parameter of the driving device 207) corresponding to the phase difference can be confirmed. The controller 209 may control the driving device 209 based on the confirmed change direction (or control parameter of the driving device 207). In another example, the controller 209 continuously changes the physical shape of the coil 205 until the phase difference between the voltage Vin and the current Iin is below a critical phase difference (e.g., a specified The driving device 207 can also be controlled to change the unit. Methods of changing the physical shape of the various coils 205 described above will be described in more detail later with reference to FIGS. 5 and/or 6.

In one embodiment, the controller 209 is, for example, at least one of a micro controlling unit (MCU), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a microprocessor, or an application processor (AP). However, those skilled in the art will understand that there is no limitation as long as the means can perform operations, control, and/or execution of instructions. In this document, when the electronic device 101 performs a specific operation, for example, the controller 209 performs a specific operation, or the controller 209 performs a specific operation when at least one piece of hardware included in the electronic device 101 is used. It may mean controlling to perform a specific action. Alternatively, the electronic device 101 performs a specific operation as at least one instruction for performing the specific operation stored in a storage circuit (e.g., memory) (not shown) of the electronic device 101 is executed, It may also mean causing the controller 209 or other hardware to perform a specific operation.

According to the above-mentioned, the electronic device 101 configures the physical shape of the coil 205 so that the phase difference between the voltage Vin and the current Iin is substantially 0 (or less than the critical phase difference). You can change it. As the phase difference between the voltage (Vin) and the current (Iin) becomes substantially 0, the possibility that heating efficiency deteriorates may be reduced.

FIG. 2C is a diagram for explaining at least one exemplary capacitor according to an embodiment. Referring to FIG. 2C, at least a portion of the

electrodes

241 and 242 may form, for example, the capacitor 203a in FIG. 2B. At least a portion of the

electrodes

243 and 242 may form, for example, the capacitor 203b in FIG. 2B. Food 270 may be placed between the

electrodes

241, 242, and 243. The capacitance of the

capacitors

203a and 203b may be different when the food 270 is placed between the

electrodes

241, 242, and 243 and when the food 270 is not placed between the

electrodes

241, 242, and 243. Alternatively, the capacitance may change depending on the moisture content and/or temperature of the food 270 . The electronic device 101 can control the phase difference between voltage and current to substantially 0 by adjusting the inductance of the coil. FIG. 2D is a diagram for explaining at least one exemplary capacitor according to an embodiment. Referring to FIG. 2D, the

electrodes

241 and 245 may form, for example, the capacitor 203a in FIG. 2B. The

electrodes

243 and 246 may form, for example, the capacitor 203b in FIG. 2B. Meanwhile, the shape and size of the electrodes according to FIGS. 2C and 2D, and/or the number of capacitors constituted by the electrodes are merely illustrative and are not limited.

Figure 2E shows a coil according to one embodiment.

Referring to FIG. 2E, the coil 205 according to one embodiment may have a spring shape and may be made of a material whose length l can be changed. In one example, the coil 205 may be an air-core coil in which no ferrite is disposed. In some cases, ferrite may have non-linear characteristics due to changes in shape, so the coil 205 may be implemented as an air-core coil, but there is no limitation. In other examples, ferrite may be placed inside the coil 205. There is no limit to the type of ferrite. For example, the inductance of coil 205 is μN ² A/l. μ is the permeability inside the coil 205. For example, in the case of an air-core coil, it may be the permeability of air. N may be the number of turns, A may be the area of the cross section of the coil 205, and l may be the length of the coil 205. As described above, the length l can be changed, and since inductance and length are inversely proportional, a change in length may cause a change in inductance. That is, the resonant frequency of the resonant circuit may change depending on the change in the length of the coil 205, which may also affect the phase difference between the output voltage and output current. If the length of coil 205 is appropriately adjusted, the phase difference between the output voltage and output current can be substantially zero (or less than a critical phase difference). Accordingly, the electronic device 101 may adjust the length of the coil 205 so that the phase difference between the output voltage and the output current is substantially 0 (or less than the critical phase difference). The length of the coil 205 may be adjusted, for example, by a driving device 207 that includes a structure capable of compressing or expanding the coil 205 in the longitudinal direction. The electronic device 101 can adjust the length of the coil 205 by controlling the driving device 207. As the inductance changes according to the adjustment of the length, the inductance can be adjusted adaptively to continuous dielectric constant changes. Meanwhile, those skilled in the art will understand that the spring shape of the coil 205 in FIG. 2E is only an example, and that there is no limit to the shape of the coil 205.

According to one embodiment, the electronic device 101, in operation 301, while the state of the structure of the driving device 207 is in the first state, between the electrodes of each of the at least one

capacitor

203a and 203b (e.g. For example, the source 201 may be controlled to provide first power for heating food disposed between the

electrodes

241 and 242 and between the

electrodes

243 and 242. While the state of the structure of the driving device 207 is in the first state, the length of the coil 205 may be the first length, and accordingly the at least one

capacitor

203a, 203b and the coil 205 constitute at least One resonant circuit may have a first resonant frequency. Meanwhile, the frequency and/or magnitude of the first power may be preset or may be set based on the heating mode, and there is no limitation. In operation 303, the electronic device 101 may check the phase difference between the output voltage and output current detected by the detector 211 while the first power is being provided. For example, the capacitance of the at least one capacitor (203a, 203b) may be changed depending on the type, moisture content, and/or temperature of the food disposed between the electrodes of each of the at least one capacitor (203a, 203b). . Accordingly, the phase difference between the output voltage and the output current may be substantially non-zero (or exceed a threshold phase difference). In operation 305, the electronic device 101 changes the state of the structure of the drive device 207 from the first state to the second state based on the phase difference while controlling the source 201 to maintain provision of the first power. The driving device 207 can be controlled to do so. Here, maintaining provision of the first power may mean, for example, that the frequency of the first power is maintained, that both the frequency and magnitude of the power are maintained, or that the magnitude of the power is maintained. While the state of the structure of the drive device 207 is in the second state, the length of the coil 205 may be the second length, and accordingly the at least one

capacitor

203a, 203b and the coil 205 constitute at least One resonant circuit may have a second resonant frequency. As the resonant frequency of at least one resonant circuit changes, the phase difference between the output voltage and output current may change. For example, the electronic device 101 may control the driving device 207 so that the phase difference between the output voltage and the output current is substantially 0 (or less than a critical phase difference). While the length of the coil 205 is the second length, the phase difference between the output voltage and the output current can be substantially zero (or can be below the critical phase difference), and thus the heating efficiency will not be reduced. You can.

According to one embodiment, the electronic device 101, in operation 401, while the state of the structure of the driving device 207 is in the first state, between the electrodes of each of the at least one

capacitor

electrodes

241 and 242 and between the

electrodes

capacitor

203a, 203b and the coil 205 constitute at least One resonant circuit may have a first resonant frequency. In operation 403, the electronic device 101 may check the phase difference between the output voltage and output current detected by the detector 211 while the first power is being provided. The electronic device 101 may check whether the confirmed phase difference exceeds the critical phase difference in operation 405. Here, the critical phase difference may be an experimentally set value at which the heating efficiency can be maintained above the critical efficiency, but those skilled in the art will understand that there is no limitation on the setting method. If the confirmed phase difference is greater than the threshold phase difference (405-Yes), the electronic device 101 controls the source 201 to maintain provision of the first power, based on the phase difference, in operation 407. The driving device 207 can be controlled to change the state of the structure of the driving device 207 from the first state to the second state. While the state of the structure of the drive device 207 is in the second state, the length of the coil 205 may be the second length, and accordingly the at least one

capacitor

203a, 203b and the coil 205 constitute at least One resonant circuit may have a second resonant frequency. As the resonant frequency of at least one resonant circuit changes, the phase difference between the output voltage and output current may change. If the confirmed phase difference is less than the critical phase difference (405-No), the electronic device 101 may maintain the state of the structure of the driving device 207 in the first state in operation 409. Those skilled in the art will understand that, given that the electronic device 101 does not perform any particular operation, an instruction corresponding to operation 409 may not exist. Meanwhile, in operation 407, the electronic device 101 may check again whether the phase difference exceeds the threshold difference after changing the state of the driving device 207 to the second state. If it is determined that the phase difference still exceeds the critical phase difference, the electronic device 101 may additionally change the state of the driving device 207 from the second state to another state. The electronic device 101 may repeat changing the state of the driving device 207 until the phase difference becomes less than or equal to the critical phase difference.

According to one embodiment, in operation 501, the electronic device 101 may check the phase difference between the output voltage and output current detected by the detector 211 while the first power is being provided. In operation 503, the electronic device 101 may check the length change size of the coil 205 and/or the control parameter of the driving device 207 corresponding to the phase difference. The electronic device 101 may store, for example, association information between the phase difference and the length change size of the coil 205 and/or association information between the phase difference and the control parameter of the driving device 207. Table 1 may provide association information between an example phase difference and the length change magnitude of the coil 205.

위상 차이의 범위Range of phase difference	코일의 길이 변경 크기Size of change in length of coil
a1 초과 a2 이하Above A1 and below A2	b1b1
a2 초과 a3 이하Above A2 and below A3	b2b2
a3 초과 a4 이하Above A3 and below A4	b3b3
a4 초과 a5 이하Above A4 and below A5	b4b4
a5 초과 a6 이하Above A5 and below A6	b5b5

In Table 1, those skilled in the art will understand that a1 to a6 and/or b1 to b5 are not limited as long as they are real numbers, and may be either positive or negative numbers. For example, a positive number may mean increasing the length of the coil 205, and a negative number may mean decreasing the length of the coil 205. In another example, the electronic device 101 may store associated information in which the length change size of the coil 205 consists of only positive numbers. In this case, the electronic device 101 may additionally store the information between the phase of the output voltage and the phase of the output current. Based on the information related to the lead, it is also possible to check whether the length of the coil increases or decreases, which will be described later. For example, assume that the electronic device 101 confirms that the phase difference between the output voltage and the output current is c. The electronic device 101, with reference to the relevant information shown in Table 1, confirms that the phase difference c is included in the range above a3 and below a4, and that the length change size of the coil corresponding to the range above a3 and below a4 is b3. You can check it. The electronic device 101 may control the driving device 207 to change the length of the coil 205 by the confirmed b3. The electronic device 101 operates the driving device 207 so that the length of the coil 205 is changed by b3 in a manner that refers to the association information between the control parameters of the driving device 207 and the length change size of the coil 205. However, this is an example and there is no limitation on the control method of the driving device 207. Alternatively, the electronic device 101 refers to the association information between the phase difference and the control parameters of the driving device 207, The driving device 207 may be controlled to change the length of the coil 205. For example, Table 2 may be an example of correlation information between phase differences and control parameters of the drive device 207.

위상 차이의 범위Range of phase difference	구동 장치의 제어 파라미터Control parameters of the drive unit
a1 초과 a2 이하Above A1 and below A2	r1r1
a2 초과 a3 이하Above A2 and below A3	r2r2
a3 초과 a4 이하Above A3 and below A4	r3r3
a4 초과 a5 이하Above A4 and below A5	r4r4
a5 초과 a6 이하Above A5 and below A6	r5r5

In Table 2, the control parameter may be, for example, the rotation angle (or number of rotations) of the motor included in the driving device 207, but this is exemplary and the driving device for changing the length of the coil 205 ( 207), there is no limit as long as it is a control parameter. Those skilled in the art will understand that r1 to r5 are not limited as long as they are real numbers, and may be either positive or negative numbers. For example, a positive number may mean rotating the motor included in the driving device 207 clockwise, and a negative number may mean rotating the motor included in the driving device 207 counterclockwise. In another example, the electronic device 101 may store associated information in which the control parameter consists of only positive numbers, in which case the electronic device 101 may additionally store information associated with the lead between the phase of the output voltage and the phase of the output current. Based on this, the rotation direction of the motor included in the driving device 207 can be confirmed, which will be described later. For example, assume that the electronic device 101 confirms that the phase difference between the output voltage and the output current is c. The electronic device 101 may refer to the relevant information shown in Table 2 to confirm that the phase difference c is included in the range between a3 and a4, and that the control parameter corresponding to the range between a3 and a4 is r3. . The electronic device 101 can control the driving device 207 using the confirmed control parameter r3.

According to one embodiment, in operation 601, the electronic device 101 may check the phase difference between the output voltage and output current detected by the detector 211 while the first power is being provided. The electronic device 101 may adjust the control parameters of the driving device 207 in designated units in operation 603. The electronic device 101 may check whether the phase difference between the output voltage and the output current is less than or equal to the critical phase difference in operation 605. If the phase difference between the output voltage and the output current is greater than the threshold phase difference (605-No), the electronic device 101 may adjust the control parameter of the driving device 207 in a specified unit in operation 603. . The electronic device 101 may repeat the adjustment of the control parameters of the driving device 207 in operation 603 until the phase difference between the output voltage and the output current becomes less than or equal to the critical phase difference. If the phase difference between the output voltage and the output current is confirmed to be less than the threshold phase difference (605-yes), the electronic device 101 may stop adjusting the control parameters of the driving device 207 in operation 607. there is. Those skilled in the art will understand that, given that the electronic device 101 does not perform any particular operation, an instruction corresponding to operation 607 may not exist. According to the above, the phase difference between the output voltage and the output current can be less than or equal to the critical phase difference, so that a decrease in heating efficiency can be prevented.

According to one embodiment, the electronic device 101 may set the adjustment unit of the control parameter of the driving device 207 differently for each phase difference. For example, if the phase difference is relatively large, the adjustment unit of the control parameter of the driving device 207 may be set relatively large, and if the phase difference is relatively small, the control parameter of the driving device 207 may be adjusted. The unit can be set to be relatively small. Accordingly, when the phase difference is relatively large, adjustment of the control parameters of the rough driving device 207 can be performed, and when the phase difference is relatively small, adjustment of the control parameters of the fine driving device 207 can be performed. Adjustment of control parameters may be performed.

FIG. 7A shows a flowchart for explaining an example operating method of an electronic device according to an embodiment. The embodiment of FIG. 7A will be described with reference to FIG. 7B. 7B shows waveforms of output voltage and output current according to one embodiment.

According to one embodiment, in operation 701, the electronic device 101 may check the phase difference between the output voltage and output current detected by the detector 211 while the first power is being provided. The electronic device 101 may check whether the phase of the output voltage leads the phase of the output current in operation 703. For example, in FIG. 7B , a waveform 771 of the output voltage and a waveform 772 of the output current identified according to one embodiment are shown. In the example of FIG. 7B, it can be seen that the output voltage waveform 771 is ahead of the output current waveform 772 by Φ. The detector 211 can check whether the phase of the output voltage leads the phase of the output current and output a detection result. If it is confirmed that the phase of the output voltage leads the phase of the output current (703 - Yes), the electronic device 101 may control the driving device 211 to increase the length of the coil 705 in operation 705. . If the phase of the output voltage leads the phase of the output current, the inductance may need to be reduced, which may require a reduction in the length of the coil 205. If it is confirmed that the phase of the output current leads the phase of the output voltage (703-No), the electronic device 101 may control the driving device 211 to reduce the length of the coil 705 in operation 707. . If the phase of the output current is ahead of the phase of the output voltage, the inductance may need to be increased, which may require an increase in the length of the coil 205.

In one embodiment, the detector (e.g., detector 211 in FIG. 2A) may include zero

crossing detectors

811 and 812 and/or a phase detector 820. Zero crossing detector 811 can receive alternating voltage 801. The zero crossing detector 811 has a rising edge when the AC voltage 801 changes from a 0 value to a positive value, and a falling edge when the AC voltage 801 changes from a positive value to a 0 value. A zero crossing waveform 813 with edges can be output. Zero crossing detector 811 may receive alternating current 802. Zero crossing detector 812 has a rising edge when alternating current 802 changes from a zero value to a positive value, and a falling edge when alternating current 802 changes from a positive value to a zero value. A zero crossing waveform 814 with edges can be output. The zero crossing waveform 813 corresponding to voltage and the zero crossing waveform 814 corresponding to current may be provided to the phase detector 820.

According to one embodiment, the phase detector 820 may include a timing analyzer 821 and/or a priority detector 822. The timing analyzer 821 can check the phase difference between the voltage 801 and the current 802 using the zero crossing waveform 813 and the zero crossing waveform 814 corresponding to the current. A detailed exemplary process for checking the phase difference will be described with reference to FIG. 8B. Timing analyzer 821 may provide information Δt associated with the phase difference to controller 830 (e.g., controller 209 in FIG. 2A). Information Δt associated with the phase difference may be expressed, for example, in time units in the time dimension, but those skilled in the art will understand that there is no limitation on the unit for expressing the phase difference. The timing analyzer 821 may provide a motor driving signal (Motor_ON) to the controller 830 when the information (Δt) associated with the phase difference exceeds the critical phase difference. Accordingly, since the motor driving signal (Motor_ON) is not output while the information (Δt) associated with the phase difference is below the critical phase difference, the controller 830 uses the driving device 840 (e.g., the driving device in FIG. 2 (207)) may not be controlled. Meanwhile, this is an example, and the timing analyzer 821 may not output the motor driving signal (Motor_ON). In this case, the controller 830 directly determines whether the information Δt associated with the phase difference exceeds the critical phase difference, and when the information Δt associated with the phase difference exceeds the critical phase difference, the driving device 840 can also be controlled. The controller 830 may control the driving device 840 to adjust the length of the coil 205 based on information Δt associated with the phase difference. For example, as described with reference to FIG. 5, the controller 830 may include first association information and/or information associated with the phase difference and a drive device between information associated with the phase difference and the magnitude of the change in length of the coil 205. By referring to the second related information between the control parameters of 840, the control parameters of the driving device 840 corresponding to the information Δt related to the phase difference can be confirmed. The controller 830 may provide a driving device control signal based on control parameters to the driving device 840. The driving device 840 may operate based on the received driving device control signal, and accordingly, the state of the structure of the driving device 840 may be changed to change the length of the coil 205. Alternatively, as described with reference to FIG. 6 , the controller 830 may adjust control parameters in designated units until the information Δt associated with the phase difference becomes less than or equal to the critical phase difference. In this case, the controller 830 determines whether the information Δt associated with the phase difference is less than or equal to the critical phase difference, and controls the driving device 840 when the information Δt associated with the phase difference is greater than the critical phase difference. can do. If the information Δt associated with the phase difference is less than or equal to the critical phase difference, control of the driving device 840 may be refrained. Meanwhile, as described above with reference to FIG. 6, the controller 830 can control the driving device 840 in designated units, and the designated unit is one value regardless of the information (Δt) associated with the phase difference. It may be set, or in another example, may be selected as one of a plurality of values corresponding to information (Δt) related to the phase difference.

In one embodiment, priority detector 822 determines whether the phase of voltage 801 leads the phase of current 802 or whether the phase of current 802 leads the phase of voltage 801. You can. As described above, when the phase of the voltage 801 leads the phase of the current 802, the inductance is required to be reduced and the length of the coil 205 is required to be increased. When the phase of the current 802 leads the phase of the voltage 801, the inductance is required to increase and the length of the coil 205 is required to be reduced. In one example, the drive device 840 increases the length of coil 205 when the motor rotates in the forward direction and increases the length of coil 205 when the motor rotates in the reverse direction. It may include a structure whose length decreases. In this case, the priority detector 822 detects that when the phase of the voltage 801 leads the phase of the current 802, the length of the coil 205 is required to increase, so that the motor of the driving device 840 A signal (F) indicating that forward rotation is required can be output. When the phase of the current 802 leads the phase of the voltage 801, the priority detector 822 rotates the motor of the driving device 840 in the reverse direction as a reduction in the length of the coil 205 is required. A signal (R) indicating this request can be output. The controller 830 may control the driving device 840 based on the signal (F or R) provided from the priority detector 822. If a signal F indicating that forward rotation is required is obtained, the controller 830 provides a control parameter corresponding to the information Δt associated with the phase difference, or a drive device control signal to cause forward rotation with a designated control parameter. can be provided as the driving device 840. If a signal R indicating that reverse rotation is required is obtained, the controller 830 provides a control parameter corresponding to the information Δt associated with the phase difference, or a drive device control signal to cause reverse rotation with a designated control parameter. can be provided as the driving device 840. Meanwhile, this is an example, and in another example, the driving device 840 increases the length of the coil 205 when the motor rotates in the forward direction and increases the length of the coil 205 when the motor rotates in the reverse direction. In this case, those skilled in the art will understand that the coil 205 may include a structure in which the length is reduced.

Meanwhile, in another example, priority detector 822 determines whether the phase of voltage 801 leads the phase of current 802, or whether the phase of current 802 leads the phase of voltage 801. Information may also be provided to the controller 830. In this case, the controller 830 determines whether the phase of the voltage 801 leads the phase of the current 802 or whether the phase of the current 802 leads the phase of the voltage 801. , the driving device 840 can also be controlled. For example, if information is obtained indicating that the phase of the voltage 801 leads the phase of the current 802, the controller 830 may send a drive control signal to the drive device to cause the length of the coil 205 to increase. 840). For example, the drive control signal may include, but is not limited to, forward rotation and control parameters of the motor within the drive unit 840. For example, if information is obtained indicating that the phase of the current 802 leads the phase of the voltage 801, the controller 830 may send a drive control signal to the drive device to cause the length of the coil 205 to be reduced. 840). For example, the drive control signal may include, but is not limited to, reverse rotation and control parameters of the motor in drive unit 840.

According to one embodiment, the zero crossing detector 811 may receive an alternating current voltage 801. The zero crossing detector 811 may output a zero crossing waveform 830 having an edge at the point when the AC voltage 801 crosses 0. Zero crossing detector 811 may receive alternating current 802. The zero crossing detector 812 may output a zero crossing waveform 840 having an edge at the point when the alternating current 802 crosses zero. The zero crossing waveform 830 corresponding to voltage and the zero crossing waveform 840 corresponding to current may be provided to the timing analyzer 821.

The delay element 831 included in the timing analyzer 821 according to one embodiment may delay the zero crossing waveform 830 according to a designated delay degree and output the delayed zero crossing waveform 832. The inverting element 833 may invert the delayed zero crossing waveform 832 and output the inverted crossing waveform 834. A zero crossing waveform 830 and an inverted crossing waveform 834 may be input to the AND element 835. The AND element 835 may output an AND operation result 836 for both

waveforms

830 and 834.

The delay element 841 included in the timing analyzer 821 according to one embodiment may delay the zero crossing waveform 840 according to a designated delay degree and output the delayed zero crossing waveform 842. The inverting element 843 may invert the delayed zero crossing waveform 842 and output the inverted crossing waveform 844. A zero crossing waveform 840 and an inverted crossing waveform 844 may be input to the AND element 845. The AND element 845 may output an AND operation result 846 for both

waveforms

830 and 834.

There may be a phase difference of Δt between the AND operation result 836 corresponding to the voltage 801 and the AND operation result 846 corresponding to the current 802 according to one embodiment, which is the voltage 801 and There may be a phase difference between the currents 802. Both

results

836 and 846 can be input to OR element 850. The OR element 850 may output the OR operation result 850a for both

results

836 and 846. The OR operation result 850a may include a pulse 850aa based on the voltage 801 and a pulse 850bb based on the current 802. There may be a phase difference (Δt) between pulse 850aa and pulse 850bb. The counter 851 can check the phase difference Δt between the pulse 850aa and the pulse 850bb using the clock provided from the clock source 854. The counter 851 may output (858) the confirmed phase difference (Δt) to the controller 830, for example. The controller 803 may control the driving device 840 based on the phase difference (Δt). Meanwhile, the one-shot circuit 852 may output a signal 853 that remains high for a specified period from the rising edge of the pulse 850bb of the OR operation result 850a. On the other hand, when the phase difference Δt between the voltage 801 and the current 802 is relatively small, the pulses 850aa and 805bb in the OR operation result 850a are not generated, but the OR operation result ( In 850a), it can be expressed as the presence of one pulse. In this case, the signal 853 output from the one-shot circuit 852 may be converted to high at a later point than in FIG. 8B. The controller 830 may check whether the phase difference Δt is less than or equal to the critical phase difference based on the signal 853 output from the one-shot circuit 852. For example, if the time point at which the signal 853 output from the one-shot circuit 852 is converted to high is before a designated time point, the controller 830 sets the phase difference Δt to the critical phase difference. It can be confirmed that it has been exceeded. The controller 830 may confirm that the phase difference Δt is less than or equal to the critical phase difference when the time point at which the signal 853 output from the one-shot circuit 852 is converted to high is after a designated time point. , there is no limit. According to the above description, the electronic device 101 can adjust the length of the coil 205 based on the phase difference Δt that is less than or equal to the critical phase difference.

FIG. 8C is a diagram for explaining the operation of an exemplary priority detector according to an embodiment.

According to one embodiment, the zero crossing detector 811 may receive an alternating current voltage 801. The zero crossing detector 811 may output a zero crossing waveform 861 having an edge at the point when the AC voltage 801 crosses 0. Zero crossing detector 811 may receive alternating current 802. The zero crossing detector 812 may output a zero crossing waveform 871 having an edge at the point when the alternating current 802 crosses 0. The zero crossing waveform 861 corresponding to voltage and the zero crossing waveform 871 corresponding to current may be provided to the priority detector 822.

The delay element 862 included in the priority detector 822 according to one embodiment may delay the zero crossing waveform 861 according to a designated delay degree and output the delayed zero crossing waveform 863. The inverting element 864 may invert the delayed zero crossing waveform 863 and output the inverted crossing waveform 865. A zero crossing waveform 861 and an inverted crossing waveform 865 may be input to the AND element 866. The AND element 866 can output the AND operation result 867 for both

waveforms

861 and 865. A zero crossing waveform 861 and an AND operation result 867 may be input to the flip-flop device 868. When the T terminal of the flip-flop device 868 is high, the output result of the Q terminal may be inverted for each rising edge of the C terminal. When the T terminal is low, there is no change in the output result of the Q terminal. Waveform 869 is the output result of the flip-flop device 868.

The delay element 872 included in the priority detector 822 according to one embodiment may delay the zero crossing waveform 871 according to a designated delay degree and output the delayed zero crossing waveform 873. The inverting element 874 may invert the delayed zero crossing waveform 873 and output the inverted crossing waveform 875. A zero crossing waveform 871 and an inverted crossing waveform 875 may be input to the AND element 876. The AND element 876 can output the AND operation result 877 for both

waveforms

861 and 865. A zero crossing waveform 871 and an AND operation result 877 may be input to the flip-flop device 878. When the T terminal of the flip-flop device 878 is high, the output result of the Q terminal may be inverted for each rising edge of the C terminal. When the T terminal is low, there is no change in the output result of the Q terminal. Waveform 879 is the output result of the flip-flop device 878. According to one embodiment, priority detector 822 may include AND

elements

881 and 883 and one-shot circuits 882. The Q terminal of the flip-flop device 868 may be connected to the first input terminal of the AND device 881. A one-shot circuit 884 is connected to the second input terminal of the AND element 881, and the waveform input to the second input terminal may be inverted. The Q terminal of the flip-flop element 878 may be connected to the first input terminal of the AND element 883. A one-shot circuit 882 is connected to the second input terminal of the AND element 883, and the waveform input to the second input terminal may be inverted. Accordingly, for example, when the phase of the voltage 801 leads the phase of the current 802, the portion of the output waveform 891 from the one-shot circuit 882 that transitions from low to high (879) may be included. When the phase of the voltage 801 leads the phase of the current 802, the output waveform 892 from the one-shot circuit 884 can remain low throughout the entire section. Although not shown, if the phase of the current 802 leads the phase of the voltage 801, the output waveform from the one-shot circuit 882 remains low, and the output from the one-shot circuit 884 The waveform may also include low to high transitions. The memory 893 may store

waveforms

891 and 892 output from the one-

shot circuits

882 and 884. The controller 830 refers to the memory 893 and uses the

waveforms

891 and 892 output from the one-

shot circuits

882 and 884 to provide lead information between the phase of the voltage 801 and the phase of the current 802. You can check. The electronic device 101 may determine whether the length of the coil 205 increases or decreases based on whether the phase of the voltage 801 and the phase of the current 802 lead. For example, when the phase of the voltage 801 is ahead of the phase of the current 802, the electronic device 101 may control the driving circuit 840 to increase the length of the coil 205. For example, when the phase of the current 802 is ahead of the phase of the voltage 801, the electronic device 101 may control the driving circuit 840 to reduce the length of the coil 205. Meanwhile, those skilled in the art will understand that the implementations of FIGS. 8A to 8C are merely exemplary and that there are no limitations to the configuration for checking the phase difference between the current and voltage and/or the lead information between the phase of the voltage and the phase of the current.

According to one embodiment, the electronic device 101 may include a source 901,

electrodes

911, 912, and 913, a ground plate 915, and a coil 918. The

electrodes

911 and 913 may be spaced apart by, for example, h_0-h_v. At least a portion of the

electrodes

911 and 913 may form a capacitor. The

electrodes

912 and 913 may be spaced apart by, for example, h_0-h_v. At least a portion of the

electrodes

912 and 913 may form a capacitor. An air core coil 918 may be connected to the electrode 913. Coil 918 may be connected to ground plate 915. Coil 918 may be supported by, for example, a ground plate 915. The electrode 913 may be supported by, for example, a coil 910 and/or a ground plate 915. Food 914 may be placed between the

electrodes

911 and 912 and the electrode 913. By alternating current power provided from the source 901, the direction of the electric field formed between the electrode 911 and at least part of the electrode 913 may be repeatedly changed, and the direction of the electric field formed between the electrode 912 and at least part of the electrode 913 may be repeatedly changed. Changes in direction of the electric field formed in between may be repeated. The food 914 may be heated by repeatedly changing the direction of the electric field. The detector 921 may receive the output voltage (v_s) and output current (v_s) of the source 901, and may determine the phase difference between the output voltage (v_s) and the output current (v_s) and/or the output voltage (v_s). ) and the phase of the output current (v_s) can be output. The electronic device 101, based on the phase difference between the output voltage (v_s) and the output current (v_s) and/or the lead information between the phase of the output voltage (v_s) and the phase of the output current (v_s), drives the device (920) can be controlled. The electrode 913 may move upward or downward according to the control of the driving device 920. As the electrode 913 moves, the length of the coil 918 between the electrode 913 and the ground plate 915 may change. A change in the length of the coil 918 may cause a change in the resonant frequency of each of the at least one capacitor and at least one resonant circuit composed of the coil. The electronic device 101 may adjust the length of the coil 918 so that the phase difference between the output voltage (v_s) and the output current (v_s) is substantially 0 (or less than a critical phase difference). In the embodiment of FIG. 9A, the distance between the electrodes constituting the capacitor (for example, the electrode 911 and at least a portion of the electrode 913) may change according to the movement of the electrode 913, which is the capacitance. may cause changes. This is an example, and those skilled in the art will understand that in another example, in order to change the length of the coil 918, the position of the electrode 913 may be fixed and the position of the ground plate 915 may be changed.

According to one embodiment, a coil 938 may be connected between the electrode 932 and the electrode 933. At least a portion of the

electrodes

931 and 933 may form a capacitor. At least a portion of the

electrodes

932 and 933 may form a capacitor. Food 935 may be placed between the

electrodes

931 and 932 and the electrode 933. As the direction of the electric field formed between the

electrodes

931 and 932 and the electrode 933 is repeatedly changed, the food 935 may be heated. The electrode 933 may be grounded. The electronic device 101 operates the coil ( A driving device (not shown) can be controlled to adjust the length of 938). The electrode 932 may move upward or downward according to the control of a driving device (not shown). As the electrode 932 moves, the length of the coil 938 between the electrode 932 and the electrode 933 may change. Changing the length of the coil 938 may cause a change in the resonant frequency of each of the at least one capacitor and at least one resonant circuit composed of the coil. The electronic device 101 may adjust the length of the coil 938 so that the phase difference between the output voltage (v_s) and the output current (v_s) is substantially 0 (or less than a critical phase difference). Meanwhile, those skilled in the art will understand that the arrangement of the electrode, coil, and ground plate according to FIGS. 9A and 9B is illustrative and is not limited.

10A to 10F are diagrams for explaining an exemplary driving device according to an embodiment.

Referring to FIGS. 10A and 10B , the driving device may include a motor 1001 and a gear 1002 connected to the motor 1001. As the motor 1001 rotates, the first gear 1002 may rotate. The first gear 1002 may be engaged with the second gear 1003, and the second gear 1003 may also rotate as the motor 1001 rotates. The second gear 1003 may be connected to the first fixing member 1004 through a screw 1008. Linear movement of the first fixing member 1004 may be possible by rotation of the screw 1008. For example, rotation of the second gear 1003 may cause linear movement of the first fixing member 1004. A shaft 1033 may be connected between the first fixing member 1004 and the second fixing member 1031. Buckling

prevention members

1020 and 1030 may be disposed on the shaft 1033. A coil may be wound on the

anti-buckling members

1020 and 1030. The buckling

prevention members

1020 and 1030 are not limited as long as they have a shape that can prevent buckling that may occur when the length of the coil is changed. A coil may be wound around an axis 1033 in the space 1005 between the first fixing member 1004 and the second fixing member 1031.

Figure 10c shows a side view of the first fixation member. Figure 10d shows a top view and a rear view of the first fixation member. Figure 10e shows a front view of the first fixation member. Figure 10f is a diagram for explaining the second fixing member. Referring to FIGS. 10C and 10D, a shaft 1033 may be connected to the first fixing member 1004. Buckling

prevention members

1020 and 1030 may be disposed on the shaft 1033.

Grooves

1031a and 1031b may be formed in the anti-buckling member 1030.

Referring to FIG. 10E, grooves 1032 may be formed in the

anti-buckling members

1020 and 1030. It can be seen that while the

grooves

1031a and 1031b are formed up to the top of the anti-buckling member 1030, the groove 1032 is not formed up to the top of the anti-buckling member 1030. As described above, a coil may be wound on the

anti-buckling members

1020 and 1030. The

grooves

1031a and 1031b may be used for coupling with the second fixing member 1031 after the coil is wound on the

anti-buckling members

1020 and 1030. More specifically, when assembling the first fixing member 1004 and the second fixing member 1040, the

protrusions

1037 and 1038 formed on the second fixing member 1031 may be inserted into the

grooves

1031a and 1031b. there is. Thereafter, the

protrusions

1037 and 1038 may be positioned at a portion where the shaft 1033 is exposed, and the first fixing member 1004 may be rotated 90 degrees at that portion. Thereafter, the

protrusions

1037 and 1038 may rest on the groove 1032 and other grooves (not shown). As the motor is driven, the first fixing member 1004 can move in the up and down direction while the

protrusions

1037 and 1038 are seated in the groove 1032 and other grooves (not shown).

According to one embodiment, the controller may be further configured to check at least one control parameter of the driving device based on the phase difference. The controller controls the drive device based on the at least one control parameter, at least as part of controlling the drive device to change the state of the structure of the drive device from the first state to the second state. It can be set to do so.

According to one embodiment, the controller may be further set to check the amount of change in length of the coil based on the phase difference. The controller controls the drive device based on the magnitude of the change in length of the coil, at least as part of controlling the drive device to change the state of the structure of the drive device from the first state to the second state. It can be set to do so.

According to one embodiment, the controller is configured to, at least as part of controlling the drive device to change the state of the structure of the drive device from the first state to the second state, wherein the phase difference equals a threshold phase difference. It can be set to control the drive device based on excess.

According to one embodiment, the controller, at least as part of controlling the drive device based on the phase difference exceeding the threshold phase difference, based on a signal received from the detector, determines that the phase difference exceeds the threshold. It can be set to check whether the phase difference is exceeded.

According to one embodiment, the controller may be set to refrain from changing the state of the structure of the drive device while the phase difference is less than or equal to the phase difference.

According to one embodiment, control of the driving device to change the structure of the driving device may be performed until the phase difference becomes less than or equal to the critical phase difference.

According to one embodiment, the controller, at least as part of an operation of controlling the drive device to change the state of the structure of the drive device from the first state to the second state, uses a control parameter in a designated unit. It can be set to control the driving device.

According to one embodiment, the controller uses a signal received from the detector as at least part of the operation of controlling the drive device to change the state of the structure of the drive device from the first state to the second state. Thus, based on the confirmation that the phase of the output voltage leads the phase of the output current, the driving device can be set to control the length of the coil to increase.

According to one embodiment, the controller uses a signal received from the detector as at least part of the operation of controlling the drive device to change the state of the structure of the drive device from the first state to the second state. Thus, based on the confirmation that the phase of the output current is ahead of the phase of the output voltage, the driving device can be set to control the length of the coil to decrease.

According to one embodiment, the electrodes constituting the at least one capacitor may include a first electrode and a second electrode constituting a first capacitor, and a third electrode constituting a second capacitor together with the second electrode. You can.

According to one embodiment, the electronic device may further include a ground plate connected to the second electrode. The coil may connect between the second electrode and the ground plate.

According to one embodiment, the coil may connect between the second electrode and the third electrode. The second electrode may be grounded.

According to one embodiment, the driving device may include a motor, a first fixing member that moves in a straight direction based on rotation of the motor, and a shaft on one side of which is connected to the first fixing member. The coil may be wound on the axis. The driving device may include a second fixing member connected to the other side of the shaft.

According to one embodiment, the driving device further includes at least one anti-buckling member disposed on the shaft, and at least a portion of the coil may be wound on the at least one anti-buckling member.

According to one embodiment, the method of operating the electronic device may further include checking at least one control parameter of the driving device based on the phase difference. The operation of controlling the driving device to change the state of the structure of the driving device from the first state to the second state may control the driving device based on the at least one control parameter.

According to one embodiment, the method of operating the electronic device may further include checking the size of the length change of the coil based on the phase difference. The operation of controlling the driving device to change the state of the structure of the driving device from the first state to the second state may control the driving device based on a change in length of the coil.

According to one embodiment, the operation of controlling the driving device to change the state of the structure of the driving device from the first state to the second state may include controlling the driving device based on the phase difference exceeding a threshold phase difference. You can control the device.

Electronic devices according to various embodiments disclosed in this document may be of various types. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. Electronic devices according to embodiments of this document are not limited to the above-described devices.

The various embodiments of this document and the terms used herein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various changes, equivalents, or replacements of the embodiments. In connection with the description of the drawings, similar reference numbers may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the above items, unless the relevant context clearly indicates otherwise. As used herein, “A or B”, “at least one of A and B”, “at least one of A or B”, “A, B or C”, “at least one of A, B and C”, and “A Each of phrases such as “at least one of , B, or C” may include any one of the items listed together in the corresponding phrase, or any possible combination thereof. Terms such as "first", "second", or "first" or "second" may be used simply to distinguish one component from another, and to refer to that component in other respects (e.g., importance or order) is not limited. One (e.g., first) component is said to be “coupled” or “connected” to another (e.g., second) component, with or without the terms “functionally” or “communicatively.” When mentioned, it means that any of the components can be connected to the other components directly (e.g. wired), wirelessly, or through a third component.

The term “module” used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and is interchangeable with terms such as logic, logic block, component, or circuit, for example. It can be used as A module may be an integrated part or a minimum unit of the parts or a part thereof that performs one or more functions. For example, according to one embodiment, the module may be implemented in the form of an application-specific integrated circuit (ASIC).

Various embodiments of the present document are software (e.g., one or more instructions stored in a storage medium (e.g., internal memory or external memory) that can be read by a machine (e.g., electronic device 101). : It can be implemented as a program). For example, a processor (e.g., controller) of a device (e.g., electronic device 101) may call at least one command among one or more commands stored from a storage medium and execute it. This allows the device to be operated to perform at least one function according to the at least one instruction called. The one or more instructions may include code generated by a compiler or code that can be executed by an interpreter. A storage medium that can be read by a device may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' only means that the storage medium is a tangible device and does not contain signals (e.g. electromagnetic waves), and this term refers to cases where data is semi-permanently stored in the storage medium. There is no distinction between temporary storage cases.

According to one embodiment, methods according to various embodiments disclosed in this document may be included and provided in a computer program product. Computer program products are commodities and can be traded between sellers and buyers. The computer program product may be distributed in the form of a machine-readable storage medium (e.g. compact disc read only memory (CD-ROM)) or through an application store (e.g. Play StoreTM) or on two user devices (e.g. It can be distributed (e.g. downloaded or uploaded) directly between smart phones) or online. In the case of online distribution, at least a portion of the computer program product may be at least temporarily stored or temporarily created in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

According to various embodiments, each component (e.g., module or program) of the above-described components may include a single or plural entity, and some of the plurality of entities may be separately placed in other components. there is. According to various embodiments, one or more of the components or operations described above may be omitted, or one or more other components or operations may be added. Alternatively or additionally, multiple components (eg, modules or programs) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each component of the plurality of components in the same or similar manner as those performed by the corresponding component of the plurality of components prior to the integration. . According to various embodiments, operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, or heuristically, or one or more of the operations may be executed in a different order, or omitted. Alternatively, one or more other operations may be added.

Claims

In electronic devices,

at least one capacitor;

a coil connected to at least some of the at least one capacitor;

a driving device including a structure for adjusting the length of the coil;

a source providing alternating current power to the at least one capacitor;

a detector configured to detect a phase difference between the output voltage and output current of the source; and

comprising the controller, wherein the controller:

While the state of the structure of the driving device is in a first state, control the source to provide first power for heating food disposed between electrodes constituting the at least one capacitor, and - the driving device wherein the coil is at a first length while the state of the structure is in the first state,

While the first power is being provided, determine the phase difference between the output voltage and the output current detected by the detector,

the drive device to change the state of the structure of the drive device from the first state to a second state different from the first state based on the phase difference, while controlling the source to maintain provision of the first power is set to control,

The electronic device wherein the coil is at a second length different from the first length while the state of the structure of the drive device is in the second state.
According to claim 1,

the controller is further configured to determine at least one control parameter of the drive device based on the phase difference,

The controller controls the drive device based on the at least one control parameter, at least as part of controlling the drive device to change the state of the structure of the drive device from the first state to the second state. An electronic device configured to do so.
According to claim 1,

the controller is further configured to determine the magnitude of change in length of the coil based on the phase difference,

The controller controls the drive device based on the magnitude of the change in length of the coil, at least as part of controlling the drive device to change the state of the structure of the drive device from the first state to the second state. An electronic device configured to do so.
According to claim 1,

The controller, at least as part of controlling the drive device to change the state of the structure of the drive device from the first state to the second state, controls the drive based on the phase difference exceeding a threshold phase difference. An electronic device set up to control a device.
According to claim 4,

The controller determines, based on a signal received from the detector, whether the phase difference exceeds the threshold phase difference, at least as part of controlling the drive device based on the phase difference exceeding the threshold phase difference. An electronic device set to check.
According to claim 4,

The electronic device wherein the controller is configured to refrain from changing the state of the structure of the drive device while the phase difference is less than or equal to the phase difference.
According to claim 4,

An electronic device in which control of the driving device for changing the structure of the driving device is performed until the phase difference becomes less than or equal to the critical phase difference.
According to claim 1,

The controller is configured to control the driving device using a control parameter in a designated unit, at least as part of an operation of controlling the driving device to change the state of the structure of the driving device from the first state to the second state. Set electronic device.
According to claim 1,

The controller, at least as part of controlling the drive device to change the state of the structure of the drive device from the first state to the second state, uses a signal received from the detector to determine the phase of the output voltage. An electronic device configured to control the drive device to increase the length of the coil, based on determining that the output current is ahead of phase.
According to claim 1,

The controller, at least as part of controlling the drive device to change the state of the structure of the drive device from the first state to the second state, uses a signal received from the detector to determine the phase of the output current. An electronic device configured to control the drive device to reduce the length of the coil, based on determining that the output voltage is ahead of phase.
According to claim 1,

The electrodes constituting the at least one capacitor include a first electrode and a second electrode constituting a first capacitor, and a third electrode constituting a second capacitor together with the second electrode.
According to claim 11,

The electronic device further includes a ground plate connected to the second electrode,

The coil connects the second electrode and the ground plate.
According to claim 11,

The coil connects between the second electrode and the third electrode,

An electronic device wherein the second electrode is grounded.
According to claim 1,

The driving device is,

motor;

a first fixing member that moves in a straight direction based on the rotation of the motor;

a shaft on one side of which is connected to the first fixing member, on which the coil is wound;

a second fixing member connected to the other side of the shaft; and

Further comprising at least one anti-buckling member disposed on the axis,

At least a portion of the coil is wound on the at least one anti-buckling member.
At least one capacitor, a coil connected to at least a portion of the at least one capacitor, a driving device including a structure for adjusting the length of the coil, a source for providing alternating current power to the at least one capacitor, and A method of operating an electronic device comprising a detector configured to detect a phase difference between an output voltage and an output current, comprising:

An operation of controlling the source to provide first power for heating food disposed between electrodes constituting the at least one capacitor while the state of the structure of the driving device is in a first state - the driving the coil is at a first length while the state of the structure of the device is in the first state;

checking the phase difference between the output voltage and the output current detected by the detector while the first power is being provided; and

the drive device to change the state of the structure of the drive device from the first state to a second state different from the first state based on the phase difference, while controlling the source to maintain provision of the first power Control the behavior

Including,

The method of claim 1 , wherein the coil has a second length different from the first length while the state of the structure of the drive device is in the second state.