Dryer and method for controlling same

Abstract

The disclosed dryer comprises: a drum; a plurality of drying electrodes arranged along the outer circumferential surface of the drum; a plurality of sterilization electrodes each disposed between the plurality of drying electrodes along the outer circumferential surface of the drum; a first RF power supply part and a second RF power supply part for generating RF signals; an impedance matching circuit for performing first impedance matching between the first RF power supply part and the plurality of drying electrodes or second impedance matching between the second RF power supply part and the plurality of sterilization electrodes; a first switch configured to connect the impedance matching circuit to the first RF power supply part or the second RF power supply part; a second switch configured to connect the impedance matching circuit and the plurality of drying electrodes; a third switch configured to connect the impedance matching circuit and the plurality of sterilization electrodes; and a control part.

Description

Dryer and method of controlling the same

[0001] The disclosed invention relates to a dryer capable of drying an object through genetic heating and a method for controlling the same.

[0002] A dryer is a device that dries an object (e.g., clothing) by removing moisture contained in the object. Various types of drying devices exist. For example, there is a dryer that supplies hot air into a drum containing the object to dry it. When supplying hot air into the drum, heat is transferred from air, which has a low specific heat, to water, which has a high specific heat. This results in low heat transfer efficiency and, consequently, low drying efficiency. Furthermore, the high-temperature air supplied into the drum can damage the object.

[0003] For another example, there are dryers that can dry objects using dielectric heating using RF (Radio Frequency). Conventional dryers using dielectric heating place the object between two parallel, flat electrodes and heat the water contained in the object by generating an electric field between the two flat electrodes. However, conventional dryers using dielectric heating only dry the object and do not provide a sterilizing function.

[0004] The disclosed invention provides a dryer and a control method capable of performing both a drying operation and a sterilizing operation by separately providing a drying electrode for drying an object accommodated in a drum and a sterilizing electrode for sterilizing the object.

[0005] The disclosed invention provides a dryer and a control method capable of providing power suitable for drying an object and power suitable for sterilizing the object.

[0006] The disclosed invention provides a dryer and a control method capable of maximizing the drying efficiency of an object while simultaneously achieving a sterilizing effect on the object.

[0007] According to one embodiment, a dryer (1) comprises: a drum; a plurality of drying electrodes arranged along an outer circumference of the drum; a plurality of sterilizing electrodes arranged between the plurality of drying electrodes along an outer circumference of the drum; a first RF power supply unit and a second RF power supply unit for generating RF signals; an impedance matching circuit for performing first impedance matching between the first RF power supply unit and the plurality of drying electrodes or second impedance matching between the second RF power supply unit and the plurality of sterilizing electrodes; a first switch configured to connect the impedance matching circuit to the first RF power supply unit or the second RF power supply unit; a second switch configured to connect the impedance matching circuit to the plurality of drying electrodes; a third switch configured to connect the impedance matching circuit to the plurality of sterilizing electrodes; And, in order to alternately perform the drying operation and the sterilization operation, it may include a control unit that controls the first RF power supply unit, the second RF power supply unit, the impedance matching circuit, the first switch, the second switch, and the third switch.

[0008] A method for controlling a dryer according to one embodiment may include: performing a drying operation by controlling the first switch, the second switch, and the third switch to connect the first RF power supply unit, the impedance matching circuit, and the plurality of drying electrodes; performing a sterilizing operation by controlling the first switch, the second switch, and the third switch to connect the second RF power supply unit, the impedance matching circuit, and the plurality of sterilizing electrodes; and alternately performing the drying operation and the sterilizing operation.

[0009] The disclosed dryer and control method can perform both drying and sterilizing operations using separately provided drying electrodes and sterilizing electrodes.

[0010] The disclosed dryer and control method can provide power suitable for drying an object and power suitable for sterilizing the object.

[0011] The disclosed dryer and control method can maximize the drying efficiency of a target object while simultaneously achieving a sterilization effect on the target object. In addition to the sterilization effect, a deodorization effect on the target object can also be achieved.

[0012] Figure 1 illustrates a network system implemented by various electronic devices.

[0013] Figure 2 illustrates a dryer according to one embodiment.

[0014] Figure 3 is a cross-sectional view of a dryer according to one embodiment.

[0015] Figures 4 and 5 illustrate the arrangement structure of electrodes according to various embodiments.

[0016] Fig. 6 is a control block diagram of a dryer according to one embodiment.

[0017] Figure 7 illustrates a circuit system for drying and sterilizing operations of a dryer according to one embodiment.

[0018] Figures 8 and 9 illustrate detailed circuit structures of the circuit system illustrated in Figure 7.

[0019] Fig. 10 illustrates a circuit structure of a dryer according to one embodiment when the dryer performs a drying operation.

[0020] Fig. 11 illustrates a circuit structure of a dryer according to one embodiment when the dryer performs a sterilization operation.

[0021] Figure 12 is a graph illustrating an example of a method for controlling the drying time interval for a drying operation.

[0022] Figure 13 is a graph illustrating another example of a method for controlling the drying time interval for a drying operation.

[0023] Fig. 14 is a flowchart illustrating a method for controlling a dryer according to one embodiment.

[0024] Fig. 15 is a flowchart illustrating an example of time control of a drying operation in the control method of a dryer described in Fig. 14.

[0025] Fig. 16 is a flowchart illustrating another example of time control of a drying operation in the control method of a dryer described in Fig. 14.

[0026] It should be understood that the various embodiments and terms used in this document are not intended to limit the technical features described in this document to specific embodiments, but rather to include various modifications, equivalents, or substitutes of the embodiments.

[0027] In connection with the description of the drawings, similar reference numerals may be used for similar or related components.

[0028] The singular form of a noun corresponding to an item may include one or more items, unless the context clearly indicates otherwise.

[0029] In this document, each of the phrases "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 "at least one of A, B, or C" may include any one of the items listed together in that phrase, or all possible combinations thereof.

[0030] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish one component from another and do not qualify the components in any other respect (e.g., importance or order).

[0031] When a component (e.g., a first component) is referred to as being “coupled” or “connected” to another component (e.g., a second component), with or without the terms “functionally” or “communicatively,” it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

[0032] The terms “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in this document, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0033] When a component is said to be “connected,” “coupled,” “supported,” or “in contact with” another component, this includes not only cases where the components are directly connected, coupled, supported, or in contact, but also cases where the components are indirectly connected, coupled, supported, or in contact through a third component.

[0034] When we say that a component is "on" another component, this includes not only cases where the component is in contact with the other component, but also cases where there is another component between the two components.

[0035] The term “and / or” includes any combination of a plurality of related described elements or any one of a plurality of related described elements.

[0036] The operating principle and embodiments of the present invention will be described with reference to the attached drawings below.

[0037] Figure 1 illustrates a network system implemented by various electronic devices.

[0038] Referring to FIG. 1, the home appliance (10) may include a communication module (or communication interface) capable of communicating with other devices such as other home appliances, user devices (2), and / or servers (3), a user interface for receiving user input and / or outputting information to a user, at least one processor for controlling the operation of the home appliance (10), and at least one memory in which a program for controlling the operation of the home appliance (10) is stored.

[0039] The home appliance (10) may be at least one of various types of home appliances. For example, the home appliance (10) may include at least one of a refrigerator (11), a dishwasher (12), an electric range (13), an electric oven (14), an air conditioner (15), a clothes manager (16), a washing machine (17), a dryer (18), and a microwave oven (19), as illustrated.

[0040] The home appliance (10) is not limited to that illustrated in FIG. 1. For example, the home appliance (10) may include various home appliances, such as a cleaning robot, a vacuum cleaner, and a television, not illustrated in the drawing. Furthermore, the aforementioned home appliances are merely examples, and in addition to the aforementioned home appliances, other home appliances, user devices (2), or devices capable of performing the operations described below, connected to a server (3), may be included in the home appliance (10) according to one embodiment.

[0041] The server (3) may include a communication module (or communication interface) capable of communicating with other devices such as other servers, home appliances (10) and / or user devices (2), at least one processor capable of processing data received from other servers, home appliances (10) or user devices (2), and at least one memory capable of storing a program for processing data or processed data. The server (3) may be implemented as various computing devices such as a workstation, a cloud, a data drive, a data station, etc. The server (3) may be implemented as one or more servers that are physically or logically separated based on function, detailed configuration of function or data, etc., and may transmit and receive data through communication between each server and process the transmitted and received data.

[0042] The server (3) can perform functions such as managing user accounts, registering home appliances (10) by linking them to user accounts, and managing or controlling registered home appliances (10). For example, a user can access the server (3) through a user device (2) and create a user account. The user account can be identified by an ID and password set by the user. The server (3) can register home appliances (10) to the user account according to a set procedure. For example, the server (3) can register, manage, and control home appliances (10) by linking identification information (e.g., serial number or MAC address) of the home appliance (10) to the user account. The user device (2) can include a communication module (or communication interface) capable of communicating with the home appliance (10) and / or the server (3), a user interface for receiving user input or outputting information to the user, at least one processor for controlling the operation of the user device (2), and at least one memory storing a program for controlling the operation of the user device (2).

[0043] The user device (2) may be carried by the user or placed in the user's home or office, etc. The user device (2) may include, but is not limited to, a personal computer, a terminal, a portable telephone, a smart phone, a handheld device, a wearable device, etc.

[0044] A program (e.g., an application) for controlling a home appliance (10) may be stored in the memory of the user device (2). The application may be sold installed in the user device (2) or downloaded and installed from an external server.

[0045] A user can access a server (3) by executing an application installed on a user device (2), create a user account, and communicate with the server (3) based on the logged-in user account to register a home appliance (10).

[0046] For example, when the home appliance (10) is operated so that the home appliance (10) can be connected to the server (3) according to the procedure guided by the application installed on the user device (2), the home appliance (10) can be registered in the user account by registering the identification information (e.g., serial number or MAC address) of the home appliance (10) in the corresponding user account on the server (3).

[0047] A user can control a home appliance (10) using an application installed on the user device (2). For example, when a user logs into a user account using an application installed on the user device (2), a home appliance (10) registered to the user account appears, and when a control command for the home appliance (10) is input, the control command can be transmitted to the home appliance (10) via the server (3).

[0048] A network can include both wired and wireless networks. Wired networks include cable networks and / or telephone networks, while wireless networks can include any network that transmits and receives signals via radio waves. Wired and wireless networks can be interconnected.

[0049] The network may include a wide area network (WAN) such as the Internet, a local area network (LAN) formed around an Access Point (AP), and / or a short-range wireless network that does not pass through an Access Point (AP). Short-range wireless networks may include, but are not limited to, Bluetooth (IEEE 802.15.1), Zigbee (IEEE 802.15.4), Wi-Fi Direct, Near Field Communication (NFC), Z-Wave, etc., for example.

[0050] An access point (AP) can connect a home appliance (10) and / or a user device (2) to a wide area network (WAN) to which a server (3) is connected. The home appliance (10) and / or the user device (2) can be connected to the server (3) via the wide area network (WAN).

[0051] The access point (AP) can communicate with a home appliance (10) or user device (2) using wireless communication such as Wi-Fi (IEEE 802.11), Bluetooth (IEEE 802.15.1), or Zigbee (IEEE 802.15.4), and can connect to a wide area network (WAN) using wired communication, but is not limited thereto.

[0052] According to various embodiments, the home appliance (10) may be directly connected to the user device (2) and / or the server (3) without going through an access point (AP).

[0053] The home appliance (10) can be connected to the user device (2) and / or the server (3) via a long-distance wireless network and / or a short-distance wireless network.

[0054] For example, the home appliance (10) can be connected to the user device (2) via a short-range wireless network (e.g., Wi-Fi Direct).

[0055] As another example, the home appliance (10) may be connected to a user device (2) and / or a server (3) via a wide area network (WAN) using a long-distance wireless network (e.g., a cellular communication module).

[0056] As another example, a home appliance (10) can connect to a wide area network (WAN) using wired communication and be connected to a user device (2) or a server (3) through the wide area network (WAN).

[0057] If the home appliance (10) can connect to a wide area network (WAN) using wired communication, it can also function as an access relay. Accordingly, the home appliance (10) can connect other home appliances to the wide area network (WAN) to which the server (3) is connected. In addition, other home appliances can connect the home appliance (10) to the wide area network (WAN) to which the server (3) is connected.

[0058] A home appliance (10) can transmit information about its operation and / or status to another home appliance, a user device (2), and / or a server (3) via a network. For example, the home appliance (10) can transmit information about its operation and / or status to another home appliance, a user device (2), and / or a server (3) when a request is received from the server (3), when a specific event occurs in the home appliance (10), or periodically or in real time. When information about its operation and / or status is received from the home appliance (10), the server (3) can update the information about the operation and / or status of the home appliance (10) that has been stored therein, and transmit the updated information about the operation and / or status of the home appliance (10) to the user device (2) via a network. Here, updating information can include various operations in which existing information is changed, such as an operation of adding new information to existing information, an operation of replacing existing information with new information, etc.

[0059] The home appliance (10) can obtain various information from other home appliances, user devices (2), and / or servers (3), and provide the obtained information to the user. For example, the home appliance (10) can obtain information related to the function of the home appliance (10) (e.g., cooking methods, washing instructions, etc.) and various environmental information (e.g., weather, temperature, humidity, etc.) from the server (3), and output the obtained information through a user interface.

[0060] The home appliance (10) can operate according to control commands received from external devices such as other home appliances, user devices (2), and / or servers (3). For example, if the home appliance (10) has obtained prior approval from the user to operate according to control commands from the server (3) even without user input, the home appliance (10) can operate according to control commands received from the server (3). Here, the control commands received from the server (3) may include, but are not limited to, control commands input by the user through the user device (2) or control commands based on preset conditions.

[0061] The user device (2) can transmit information about the user to the home appliance (10) and / or the server (3) via the communication module. For example, the user device (2) can transmit information about the user's location, the user's health status, the user's preferences, the user's schedule, etc. to the server (3). The user device (2) can transmit information about the user to the server (3) with the user's prior consent.

[0062] The home appliance (10), the user device (2), and / or the server (3) may determine control commands using technologies such as artificial intelligence. For example, the server (3) may receive information regarding the operation and / or status of the home appliance (10) or information regarding the user of the user device (2), process the information using technologies such as artificial intelligence, and transmit the processing result or control command to the home appliance (10) or the user device (2) based on the processing result.

[0063] Figure 2 illustrates a dryer according to one embodiment.

[0064] The dryer (1) described below may correspond to the aforementioned home appliance (10).

[0065] Referring to FIG. 2, the dryer (1) may include a cabinet (1a) forming an exterior and a drum (20) rotatably installed within the cabinet (1a). The cabinet (1a) may be provided in an approximately hexahedral shape. The cabinet (1a) may include an upper cover (1b) providing an upper portion, a front cover (1c) providing a front portion, and a base providing a bottom portion.

[0066] For example, the front cover (1c), the top cover (1b), and the base, which constitute at least a portion of the cabinet (1a), may each be separately prepared and assembled. As another example, some components (e.g., the front cover, the top cover, and the base) that constitute at least a portion of the cabinet (1a) may be formed integrally.

[0067] An inlet (31) is provided on the front of the cabinet (1a) for loading or unloading clothing (not shown) as an object into or out of the drum (20). The dryer (1) may include a door (50) provided on the front (e.g., front cover (1c)) to open and close the inlet (31). After opening the door (50), a user can load or unload an object into or out of the drum (20) through the inlet (31). When the inlet (31) is closed and the dryer (1) starts operating, a door lock may lock the door (50).

[0068] A user interface (100) for interaction between a user and the dryer (1) may be provided on the upper front side of the cabinet (1a). The user interface (100) may obtain user input and display various information regarding the dryer (1). The location of the user interface (100) is not limited to the front. The user interface (100) may be provided at various locations of the dryer (1).

[0069] The user interface (100) may include a display. In addition, the user interface (100) may include an input unit (or input interface) for obtaining user input regarding the operation of the dryer (1). The input unit may include a rotatable dial and various buttons. In addition, the user interface (100) may include various types of input units and displays.

[0070] The display may be provided in the form of various display panels. For example, the display may include a liquid crystal display panel (LCD panel), a light emitting diode panel (LED panel), an organic light emitting diode panel (OLED panel), or a micro LED panel. The display may also be used as an input device, including a touch screen.

[0071] The display can display user-entered information or information provided to the user on various screens. The display can display information related to the operation of the dryer (1) in the form of at least an image or text. In addition, the display can display a graphical user interface (GUI) that enables control of the dryer (1). That is, the display can display UI elements (User Interface Elements), such as icons.

[0072] The input unit can transmit an electrical signal (e.g., voltage or current) corresponding to a user input to the control unit (300) of the dryer (1). The input unit can include various buttons and / or dials. For example, the input unit can include at least one of a power button for turning the dryer (1) on or off, a start / stop button for starting or stopping a drying operation, a drying mode button for selecting a drying mode, a temperature button for setting a drying temperature, and a time button for setting a drying time. The various buttons can be provided as physical buttons or touch buttons.

[0073] The dial included in the input unit may be configured to be rotatable. UI elements displayed on the display may move sequentially as the dial rotates. The dryer (1) may perform drying according to a selected drying mode. The drying mode may include drying parameters such as drying temperature and drying time. Different drying modes may be selected depending on the location of the object within the drum (20), the type of the object, and / or the amount of the object.

[0074] The dryer (1) may include a filter (40) detachably mounted on the front cover (1c). The filter (40) may filter out foreign substances such as lint that flow with the air circulating inside the drum (20). The dryer may include a lifter (21).

[0075] Figure 3 is a cross-sectional view of a dryer according to one embodiment.

[0076] Referring to Fig. 3, a cylindrical drum (20) may be provided inside the cabinet (1a). The drum (20) is provided to accommodate an object therein and enable drying. The drum (20) may be provided to be rotatable by receiving power from a motor (72). The drum (20) may be provided inside the cabinet (1a) to be rotatable around a rotating axis that is provided approximately horizontally with respect to the ground.

[0077] A lifter (21) may be provided on the inner surface of the drum (20) to lift an object when the drum (20) rotates. Depending on the rotation speed of the drum (20), the object may be repeatedly raised and lowered by the lifter (21). A roller (22) may be provided on the outer surface of the drum to support the drum (20) so that it rotates smoothly.

[0078] The driving device may be placed on the inner lower part of the cabinet (1a). The driving device may be mounted on the base of the dryer (1). The driving device may include a motor (72), a pulley (74) and a belt (75) for transmitting the power of the motor (72) to the drum (20).

[0079] A pulley (74) can be connected to a rotary shaft (73) connected to a motor (72). When the rotary shaft (73) is rotated by the motor (72), the pulley (74) can rotate together with the rotary shaft (73). A belt (75) can be installed so as to be wound around the outer surface of the pulley (74) and the outer surface of the drum (20). When the belt (75) is rotated by the driving force of the motor (72), the drum (20) can rotate together with the belt (75). The drum (20) can rotate clockwise or counterclockwise.

[0080] A passage (80) for circulating air may be formed inside the cabinet (1a) and inside the drum (20). The passage (80) may include an air exhaust passage (81) for discharging air from inside the drum (20) to outside the drum (20), and an air supply passage (82) for supplying air to inside the drum (20).

[0081] The dryer (1) may include an exhaust duct (60) forming an air exhaust path (81). A filter (40) may be arranged at an inlet (61) of the exhaust duct (60). The exhaust duct (60) may pass through the cabinet (1a), and an outlet (63) of the exhaust duct (60) may be exposed to the outside of the cabinet (1a). Air flowing into the inlet (61) of the exhaust duct (60) may be filtered while passing through the filter (40). The filter (40) may filter out foreign substances such as lint contained in the air.

[0082] A fan (71) for circulating air may be provided inside the cabinet (1a). By the rotation of the fan (71), air inside the drum (20) may be introduced into the exhaust duct (60). In addition, by the rotation of the fan (71), air may be supplied into the drum (20) through the air supply path (83) and the air inlet (20b) of the drum (20). The air supplied into the drum (20) may be used for drying the object.

[0083] The motor (72) can rotate not only the drum (20) but also the fan (71). Although the drum (20) and the fan (71) are exemplified as being driven by a single motor (72), this is not limited thereto. A separate fan motor (not shown) may be provided to drive the fan (71). In addition, the motor (72) may be directly connected to the drum (20) to rotate the drum (20). If the motor (72) is directly connected to the drum (20), the pulley (74) and the belt (75) may be omitted.

[0084] A plurality of electrodes may be provided between the cabinet (1a) and the drum (20). For example, a drying electrode (90a) and a sterilizing electrode (91c) may be provided between the cabinet (1a) and the drum (20). The drying electrode (90a) and the sterilizing electrode (91c) may be spaced apart from each other along the periphery of the drum (20). The drying electrode (90a) and the sterilizing electrode (91c) may be cross-spaced. The drying electrode (90a) and the sterilizing electrode (91c) may also be spaced apart from the cabinet (1a) and the drum (20).

[0085] Figures 4 and 5 illustrate the arrangement structure of electrodes according to various embodiments.

[0086] Referring to FIGS. 4 and 5, a plurality of drying electrodes (90) and a plurality of sterilizing electrodes (91) may be cross-arranged along the periphery of the drum (20). The plurality of drying electrodes (90) and the plurality of sterilizing electrodes (91) may be spaced apart from each other. Each of the plurality of drying electrodes (90) and the plurality of sterilizing electrodes (91) may be provided in a plate shape having a curvature. The plurality of drying electrodes (90) may be spaced apart from each other along the outer circumference of the drum (20). The plurality of sterilizing electrodes (91) may be arranged between the plurality of drying electrodes (90) along the outer circumference of the drum (20).

[0087] A plurality of drying electrodes (90) and a plurality of sterilizing electrodes (91) can be fixed between the cabinet (1a) and the drum (20). The drum (20) is not connected to the drying electrodes (90) and the sterilizing electrodes (91). Therefore, the drying electrodes (90) and the sterilizing electrodes (91) do not restrict the rotation of the drum (20). In addition, since the drying electrodes (90) and the sterilizing electrodes (91) are arranged along the periphery of the drum (20), the drying electrodes (90) and the sterilizing electrodes (91) can generate electric fields in various regions within the drum (20). Therefore, the disclosed dryer (1) can generate an electric field within the drum (20) through the drying electrodes (90) and the sterilizing electrodes (91) even while the drum (20) rotates, and can perform drying and sterilization of an object.

[0088] For example, as illustrated in FIG. 4, three drying electrodes (90: 90a, 90b, 90c) and three sterilizing electrodes (91: 91a, 91b, 91c) may be arranged along the periphery of the drum (20). The first drying electrode (90a) may be provided on the upper right side of the drum (20). The second drying electrode (90b) may be provided at a lower position of the drum (20) (e.g., below the drum (20)) adjacent to the first drying electrode (90a). The third drying electrode (90c) may be provided on the upper left side of the drum (20) adjacent to the first drying electrode (90a).

[0089] The first sterilizing electrode (91a) may be arranged between the first drying electrode (90a) and the second drying electrode (90b). The second sterilizing electrode (91b) may be arranged between the second drying electrode (90b) and the third drying electrode (90c). The third sterilizing electrode (91c) may be arranged between the first drying electrode (90a) and the third drying electrode (90c). Through the arrangement of the drying electrode (90) and the sterilizing electrode (91), drying and sterilization of the object in the entire area within the drum (20) becomes possible.

[0090] Referring to Fig. 5, it is also possible to provide only the first sterilizing electrode (91a) and the second sterilizing electrode (91b) excluding the third sterilizing electrode (91c). That is, no sterilizing electrode may be provided between the first drying electrode (90a) and the third drying electrode (90c). When the drum (20) rotates, an object moving within the drum (20) remains in the lower space within the drum (20) longer due to gravity. Therefore, sterilization of the object can be achieved simply by arranging the first sterilizing electrode (91a) between the first drying electrode (90a) and the second drying electrode (90b), and arranging the second sterilizing electrode (91b) between the second drying electrode (90b) and the third drying electrode (90c).

[0091] The number and arrangement of the drying electrodes (90) and the sterilizing electrodes (91) are not limited to those illustrated in FIGS. 4 and 5. Three or more drying electrodes (90) and three or more sterilizing electrodes (91) may be provided, respectively.

[0092] The sterilizing electrode (91) may have a smaller size than the drying electrode (90). For example, the first width of each of the plurality of drying electrodes (90) may be provided to be larger than the second width of each of the plurality of sterilizing electrodes (91). In addition, the first thickness of each of the plurality of drying electrodes (90) may be provided to be larger than the second thickness of each of the plurality of sterilizing electrodes (91). By making the thickness of the drying electrode (90) larger than the thickness of the sterilizing electrode (91), the drying efficiency can be increased. Generally, more energy and time are required for drying the object than for sterilizing the object. By making the area of ​​the drying electrode (90) relatively large, the area where the electric field is generated during the drying operation can be expanded. By making the thickness of the drying electrode (90) relatively large, the intensity of the electric field during the drying operation can be increased.

[0093] The properties of the power required for drying differ from those required for sterilization. To achieve a drying effect, a relatively low voltage and a relatively high current must be applied to the electrodes. Conversely, to achieve a sterilizing effect, a relatively high voltage and a relatively low current must be applied to the electrodes. Therefore, it is impossible to achieve both drying and sterilizing effects using the same electrodes and circuit.

[0094] The disclosed dryer (1) provides a drying electrode (90) and a sterilizing electrode (91) separately, and includes a circuit structure capable of supplying suitable power to the drying electrode (90) and the sterilizing electrode (91). The disclosed dryer (1) can apply a relatively low voltage and a relatively large current to the drying electrode (90). In addition, the disclosed dryer (1) can apply a relatively high voltage and a relatively small current to the sterilizing electrode (91). When power is supplied to each of the drying electrode (90) and the sterilizing electrode (91), an electric field can be generated inside the drum (20).

[0095] The electric field generated inside the drum (20) by the drying electrode (90) can vibrate the dielectric (e.g., water molecules) contained in the object. When the dielectric (e.g., water molecules) vibrates, dipole frictional heat is generated, which can heat the dielectric. The object can be dried by evaporating the heated dielectric. The evaporated dielectric can be discharged outside the drum (20) together with the air supplied into the drum (20).

[0096] The electric field generated inside the drum (20) by the sterilizing electrode (91) can destroy the cell membranes of microorganisms such as bacteria, thereby eliminating the microorganisms. When a strong electric field is applied to the microorganisms, the potential difference between the cell membranes increases, and since the charges generated on both surfaces of the cell membranes have opposite charges, an attractive force acts between the two charges. This attractive force compresses the cell membrane and reduces its thickness. When the thickness of the cell membrane decreases, pores are formed in the cell membrane, and the cell membrane is destroyed, thereby killing the microorganisms. Even if the electric field is generated for a short time by the sterilizing electrode (91), a sterilizing effect can be achieved on the target object.

[0097] The electric field generated inside the drum (20) by the sterilizing electrode (91) can also deodorize the target object. When a relatively high voltage is applied to the sterilizing electrode (91), corona discharge can occur. The discharge phenomenon that occurs as gas particles on the electrode surface are excited and ionized due to the high voltage applied between the two electrodes is called corona discharge. That is, when an object containing odor particles (e.g., clothing) is exposed to a high-voltage electric field, the odor particles can be separated from the object by the corona discharge phenomenon. Therefore, deodorization of the object is possible.

[0098]

[0099] Fig. 6 is a control block diagram of a dryer according to one embodiment. The operation of the dryer (1) is described in detail below.

[0100] Referring to FIG. 6, the dryer (1) may include a circuit system for performing a drying operation and a sterilizing operation. For example, the dryer (1) may include an EMI (Electro Magnetic Interference) filter (110), a power factor correction circuit (120), a DC converter (130), a first RF power supply unit (140), a second RF power supply unit (150), an impedance matching circuit (160), a first switch (SM), a second switch (SE1), a third switch (SE2), a drying electrode (90), a sterilizing electrode (91), and a control unit (300). In addition, the dryer (1) may include a motor (72) for rotating a drum (20) and a fan (71), a user interface (100), and a communication interface (200).

[0101] The user interface (100) can acquire user input and display various information regarding the operation of the dryer (1). The user interface (100) may include an input unit (or input interface) for acquiring user input and a display for displaying information. In addition, the user interface (100) may also include an output interface for outputting information (e.g., a speaker for outputting sound).

[0102] The user interface (100) may display operating information of the dryer (1). For example, the user interface (100) may display a drying mode, a drying temperature, an estimated drying time, and / or a remaining time until the end of drying. The drying mode may include predetermined drying settings (e.g., drying level, additional time to prevent wrinkles, drying time) depending on the type of object (e.g., shirt, blanket, underwear) and material (e.g., cotton, wool). For example, the standard drying may include drying settings applicable to most objects, and the blanket drying may include drying settings optimized for drying blankets. The drying settings of the drying mode may also include a sterilization time and a sterilization intensity.

[0103] Additionally, the user interface (100) may display the sterilization mode separately from the drying setting. The user may select the sterilization mode by manipulating the user interface (100). When the sterilization mode is selected, the dryer (1) may perform the sterilization operation together with or independently of the drying operation.

[0104] The communication interface (200) can communicate with at least one of the user device (2) and / or the server (3) via a network. The control unit (300) can obtain various information, various signals, and / or various data from the user device (2) and / or the server (3) via the communication interface (200). For example, the communication interface (200) can receive a remote control signal from the user device (2). The control unit (300) can obtain firmware and / or software for the operation of the dryer (1) from the server (3) via the communication interface (200).

[0105] The communication interface (200) may include various communication circuits. The communication interface (200) may include wireless communication circuits and / or wired communication circuits. For example, a communication circuit supporting wireless communication methods such as wireless local area network (WLAN), home radio frequency (RF), infrared communication, ultra-wide band (UWB) communication, Wi-Fi, Bluetooth, and Zigbee may be provided.

[0106] The control unit (300) can be electrically connected to components of the dryer (1) and can control the components of the dryer (1). For example, the control unit (300) can control the motor (72) to rotate the drum (20) and the fan (71). The control unit (300) can control the EMI filter (110), the power factor correction circuit (120), the DC converter (130), the first RF power supply unit (140), the second RF power supply unit (150), the impedance matching circuit (160), the first switch (SM), the second switch (SE1), and the third switch (SE2) to supply power to each of the drying electrode (90) and the sterilizing electrode (91).

[0107] The control unit (300) may include a processor (310) and a memory (320). The memory (320) may include volatile memory (e.g., S-RAM, D-RAM) and non-volatile memory (e.g., ROM, EPROM). The processor (310) and the memory (320) may be implemented as separate chips or as a single chip. In addition, a plurality of processors and a plurality of memories may be provided. The processor (310) may process various data and various signals using instructions, data, programs, and / or software stored in the memory (320). The processor (310) may generate control signals for controlling components of the dryer (1). The processor (310) may include one core or a plurality of cores.

[0108] An EMI (Electro Magnetic Interference) filter (110) can remove noise contained in AC power supplied from a commercial power source (AC). The EMI filter (110) can be provided as a circuit in which various electronic components, such as capacitors, inductors, and diodes, are connected in parallel and / or in series. The EMI filter (110) can discharge noise contained in AC power through a ground line. The EMI filter (110) can be provided as a passive filter or an active filter.

[0109] The power factor correction circuit (120) can compensate for the power factor of AC power. The power factor correction circuit (120) can compensate for the power factor by reducing or eliminating reactive power among the active power and reactive power that constitute the AC power. By compensating for the power factor, power loss can be reduced. The power factor correction circuit (120) can be provided as a circuit in which various electronic components, such as capacitors, inductors, and diodes, are connected in parallel and / or in series. The power factor correction circuit (120) can be controlled by the control unit (300).

[0110] The DC converter (130) can convert the power output from the power factor correction circuit (120) into DC power suitable for the first RF power supply unit (140) and the second RF power supply unit (150). The DC converter (130) can transmit the converted DC power to the first RF power supply unit (140) and the second RF power supply unit (150). The DC converter (130) can be provided as a circuit in which various electronic components such as transistors, inductors, and diodes are connected in parallel and / or in series.

[0111] The control unit (300) can control the DC converter (130) to adjust the magnitude of the voltage applied to the drying electrode (90) and / or the sterilizing electrode (91). As the power supplied to the first RF power supply unit (140) and the second RF power supply unit (150) increases, the amplitude of the RF signal increases, and the magnitude of the voltage applied to the drying electrode (90) and / or the sterilizing electrode (91) can increase. The magnitude of the voltage can be expressed as an effective value.

[0112] The first RF power supply unit (140) can generate an RF signal and apply the RF signal to the drying electrode (90). A sine wave power can be applied to the drying electrode (90) by the RF signal. The control unit (300) can control the first RF power supply unit (140) to adjust the RF power applied to the drying electrode (90). When RF power is supplied to the drying electrode (90), an electric field for dielectric heating of the target object can be generated within the drum (20).

[0113] The phase of the RF power applied to each of the plurality of dry electrodes (90) may be different. As RF power having different phases is applied to the plurality of dry electrodes (90), a rotating electric field may be generated within the drum (20). That is, the intensity of the electric field generated between two adjacent dry electrodes (90) may periodically repeat increasing and decreasing.

[0114] The second RF power supply unit (150) can generate an RF signal and apply the RF signal to the sterilizing electrode (91). A sine wave power can be applied to the sterilizing electrode (91) by the RF signal. The control unit (300) can control the second RF power supply unit (150) to adjust the RF power applied to the sterilizing electrode (91). When RF power is supplied to the sterilizing electrode (91), an electric field for sterilizing the target object can be generated within the drum (20).

[0115] The phase of the RF power applied to each of the plurality of sterilizing electrodes (91) may be different. As RF power having different phases is applied to the plurality of sterilizing electrodes (91), a rotating electric field may be generated within the drum (20). That is, the intensity of the electric field generated between two adjacent sterilizing electrodes (91) may periodically repeat increasing and decreasing.

[0116] The control unit (300) can control the first RF power supply unit (140) so that a relatively low voltage and a relatively large current are applied to the drying electrode (90). The control unit (300) can control the second RF power supply unit (150) so that a relatively high voltage and a relatively small current are applied to the sterilizing electrode (91). The voltage applied to the drying electrode (90) may be referred to as a first voltage. The current applied to the drying electrode (90) may be referred to as a first current. The voltage applied to the sterilizing electrode (91) may be referred to as a second voltage. The current applied to the sterilizing electrode (91) may be referred to as a second current. The first voltage may be lower than the second voltage. The magnitude of the first current may be greater than the magnitude of the second current.

[0117] An impedance matching circuit (160) may be provided between the first RF power supply unit (140), the second RF power supply unit (150), the drying electrode (90), and the sterilizing electrode (91). An RF signal generated by the first RF power supply unit (140) may be transmitted to the drying electrode (90) through the impedance matching circuit (160). An RF signal generated by the second RF power supply unit (150) may be transmitted to the sterilizing electrode (91) through the impedance matching circuit (160).

[0118] The impedance matching circuit (160) can match the output impedance of the RF power supply unit (140, 150) and the electrode impedance of each of the plurality of electrodes (90, 91). The impedance matching circuit (160) can match the output impedance of the first RF power supply unit (140) and the electrode impedance of the drying electrode (90). The impedance matching circuit (160) can match the output impedance of the second RF power supply unit (150) and the electrode impedance of the sterilizing electrode (91).

[0119] If there is a difference between the output impedance of the RF power supply unit (140, 150) and the electrode impedance of the electrodes (90, 91), reflected power is generated from the electrodes (90, 91), and the power transmission efficiency is reduced. In order to minimize the reflected power, matching of the output impedance of the RF power supply unit (140, 150) and the electrode impedance of the electrodes (90, 91) is required. The control unit (300) can perform impedance matching by controlling the impedance matching circuit (160).

[0120] The control unit (300) can determine the electrode impedance of the drying electrode (90) or the electrode impedance of the sterilizing electrode (91) based on the magnitude of the voltage detected at the output terminal of the impedance matching circuit (160). Since the drying electrode (90) and the sterilizing electrode (91) have different sizes, the electrode impedance of the drying electrode (90) and the electrode impedance of the sterilizing electrode (91) may be different from each other. Therefore, the impedance matching for the drying electrode (90) and the impedance matching for the sterilizing electrode (91) need to be performed separately. The control unit (300) can control the impedance matching circuit (160) to perform the first impedance matching between the first RF power supply unit (140) and the drying electrode (90) or the second impedance matching between the second RF power supply unit (150) and the sterilizing electrode (91).

[0121] The electrode impedance of each of the drying electrode (90) and the sterilizing electrode (91) may vary depending on various factors such as the amount of the object accommodated in the drum (20), the type of the object, the size of the object, the amount of water contained in the object, and the distribution state of the object. For example, if a dielectric having a high permittivity (e.g., water) exists between the plurality of electrodes (90, 91), the intensity of the electric field formed between the electrodes (90, 91) may decrease because charges are accumulated in the dielectric. When the intensity of the electric field decreases, the magnitude of the voltage detected at the electrodes (90, 91) may decrease, and the electrode impedance may decrease. As the drying of the object progresses, the water contained in the object is reduced and / or removed, and thus the electrode impedance may be detected to gradually increase.

[0122] In other words, as drying progresses, the difference between the magnitude of the voltage detected at the drying electrode (90) and / or the sterilizing electrode (91) and the magnitude of the reference voltage may gradually decrease. The control unit (300) may determine the dryness of the object based on the change in the magnitude of the voltage detected at the drying electrode (90) and / or the sterilizing electrode (91) and / or the change in electrode impedance. The control unit (300) may determine the completion of drying based on the dryness of the object reaching a tolerance range of a predetermined reference dryness. In addition, the control unit (300) may determine the completion of drying when the electrode impedance of the drying electrode (90) and / or the sterilizing electrode (91) is greater than or equal to a predetermined threshold value.

[0123] Depending on the location of the object within the drum (20), the electrode impedance detected by each of the plurality of electrodes (90, 91) may differ. The control unit (300) may obtain distribution information of the object using the electrode impedance of each of the plurality of electrodes (90, 91). In addition, the control unit (300) may determine the amount of water (i.e., moisture content) contained in the object based on the detected electrode impedance.

[0124] The first switch (SM) can connect the impedance matching circuit (160) to the first RF power supply unit (140) or the second RF power supply unit (150). The control unit (300) is electrically connected to the first switch (SM) and can control the first switch (SM). Depending on the switching of the first switch (SM), the first RF power supply unit (140) and the impedance matching circuit (160) can be connected, or the second RF power supply unit (150) and the impedance matching circuit (160) can be connected.

[0125] The first switch (SM) may be referred to as a 'mode change switch'. The control unit (300) may control the first switch (SM) to change the operation mode of the dryer (1) to a drying mode or a sterilization mode. The dryer (1) may perform a drying operation corresponding to the drying mode. The dryer (1) may perform a sterilization operation corresponding to the sterilization mode.

[0126] The second switch (SE1) can connect the impedance matching circuit (160) and the dry electrode (90). The control unit (300) is electrically connected to the second switch (SE1) and can control the second switch (SE1). When the second switch (SE1) is closed, the impedance matching circuit (160) and the dry electrode (90) are connected. When the second switch (SE1) is opened, the connection between the impedance matching circuit (160) and the dry electrode (90) is disconnected. The second switch (SE1) may be referred to as a 'dry electrode switch'.

[0127] The third switch (SE2) can connect the impedance matching circuit (160) and the sterilizing electrode (91). The control unit (300) is electrically connected to the third switch (SE2) and can control the third switch (SE2). When the third switch (SE2) is closed, the impedance matching circuit (160) and the sterilizing electrode (91) are connected. When the third switch (SE2) is opened, the connection between the impedance matching circuit (160) and the sterilizing electrode (91) is disconnected. The third switch (SE2) may be referred to as a 'sterilizing electrode switch'.

[0128] Although the second switch (SE1) and the third switch (SE2) are exemplified as being provided separately, this is not a limitation. For example, the second switch (SE1) and the third switch (SE2) may be provided as a single electrode selection switch. In this case, depending on the switching of the electrode selection switch, the impedance matching circuit (160) and the drying electrode (90) may be connected, or the impedance matching circuit (160) and the sterilizing electrode (91) may be connected.

[0129] The control unit (300) can alternately perform a drying operation for drying an object in a drum (20) and a sterilizing operation for sterilizing the object. In order to alternately perform the drying operation and the sterilizing operation, the control unit (300) can control the first RF power supply unit (140), the second RF power supply unit (150), the impedance matching circuit (160), the first switch (SM), the second switch (SE1), and the third switch (SE2).

[0130] The control unit (300) can alternately perform the drying operation and the sterilization operation multiple times. The total operating time of the dryer (1) can be divided into a drying time and a sterilization time. The drying time represents the sum of the drying time intervals for each of the plurality of drying operations. The sterilization time represents the sum of the sterilization time intervals for each of the plurality of sterilization operations. The sterilization time interval can be maintained constant. In order to maximize drying efficiency, the drying time can be set longer than the sterilization time.

[0131] The control unit (300) can adjust the drying time interval for each of the plurality of drying operations while alternately performing the plurality of drying operations and the plurality of sterilizing operations. For example, the control unit (300) can linearly or non-linearly decrease the drying time interval during a predetermined intensive drying time, and maintain the drying time interval constant based on the elapse of the predetermined intensive drying time. In another example, the control unit (300) can maintain the drying time interval constant during a predetermined intensive drying time, and reduce the drying time interval based on the elapse of the predetermined intensive drying time.

[0132] When the dryer (1) first starts drying, the drying of the object proceeds relatively quickly, and after a certain period of time, the drying of the object proceeds relatively slowly. In other words, the moisture content of the object decreases rapidly in the early stages of drying, and as drying progresses, the change in moisture content decreases. The disclosed dryer (1) can increase both drying efficiency and sterilization efficiency by adjusting the drying time interval in consideration of changes in the moisture content of the object.

[0133] Fig. 7 illustrates a circuit system for the drying and sterilizing operations of a dryer according to one embodiment. Figs. 8 and 9 illustrate detailed circuit structures of the circuit system illustrated in Fig. 7.

[0134] Referring to FIGS. 7, 8, and 9, an EMI filter (110) is connected to a commercial power source (AC) and can remove noise from AC power supplied from the commercial power source (AC). The EMI filter (110) can provide AC power with noise removed to a power factor correction circuit (120). The EMI filter (110) can be provided as a circuit in which various elements are connected in parallel and / or in series. For example, the EMI filter (110) can include a plurality of capacitors (C1, C2) connected in parallel, a plurality of inductors (L1, L2) implementing a transformer, and a plurality of diodes (D1, D2, D3, D4) forming a bridge. The circuit structure of the EMI filter (110) is not limited to the one illustrated. The circuit structure of the EMI filter (110) can be provided in various ways depending on the design.

[0135] The power factor correction circuit (120) can compensate for the power factor of AC power provided from the EMI filter (110). The power factor correction circuit (120) can provide power with the power factor compensated to the DC converter (130). The power factor correction circuit (120) can be provided as a circuit in which various elements are connected in parallel and / or series. For example, the power factor correction circuit (120) can include a plurality of electrolytic capacitors (Cpf1, Cpf2), an inductor (Lpf), a diode (Dpf), and a switching element (SW_pf). The switching element (SW_pf) can correspond to a transistor. The transistor can allow or block the flow of current depending on the application of voltage. The circuit structure of the power factor correction circuit (120) is not limited to the exemplified one. The circuit structure of the power factor correction circuit (120) can be provided in various ways depending on the design.

[0136] The DC converter (130) can convert the power output from the power factor correction circuit (120) into DC power. The DC converter (130) can transmit the converted DC power to the first RF power supply (140) and the second RF power supply (150). The DC converter (130) can be provided as a circuit in which various elements are connected in parallel and / or series. For example, the DC converter (130) can include a switching element (SW_dc), an inductor (Ldc), and a diode (Ddc). The switching element (SW_dc) can correspond to a transistor. The circuit structure of the DC converter (130) is not limited to the example. The circuit structure of the DC converter (130) can be provided in various ways depending on the design.

[0137] The first RF power supply unit (140) may be provided as a circuit including various elements for generating an RF signal. For example, the first RF power supply unit (140) may include an electrolytic capacitor (Cpa11), a capacitor (Cpa12), a plurality of inductors (Lpa11, Lpa12), and a switching element (SW_pa1). The electrolytic capacitor (Cpa11) may connect the Vpa node and the ground (GND). The switching element (SW_pa1) and the inductor (Lpa11) may be connected in series between the Vpa node and the ground (GND). In addition, the inductor (Lpa12) and the capacitor (Cpa12) connected in series may be arranged between the N1 node connecting the switching element (SW_pa1) and the inductor (Lpa11) and the first switch (SM).

[0138] The switching element (SW_pa1) of the first RF power supply unit (140) corresponds to a transistor and may be referred to as a 'first switching element'. The control unit (300) can activate or deactivate the first RF power supply unit (140) by controlling the switching element (SW_pa1). The control unit (300) can control the operation of the first RF power supply unit (140) by adjusting the voltage applied to the switching element (SW_pa1). When the switching element (SW_pa1) is turned on, the operation of the first RF power supply unit (140) can be activated. When the switching element (SW_pa1) is turned off, the operation of the first RF power supply unit (140) can be deactivated.

[0139] The circuit structure of the second RF power supply unit (150) may be the same as the circuit structure of the first RF power supply unit (140). For example, the second RF power supply unit (150) may include an electrolytic capacitor (Cpa21), a capacitor (Cpa22), a plurality of inductors (Lpa21, Lpa22), and a switching element (SW_pa2). The electrolytic capacitor (Cpa21) may connect the Vpa node and the ground (GND). The switching element (SW_pa2) and the inductor (Lpa21) may be connected in series between the Vpa node and the ground (GND). In addition, the inductor (Lpa22) and the capacitor (Cpa22) connected in series may be arranged between the N2 node connecting the switching element (SW_pa2) and the inductor (Lpa21) and the first switch (SM).

[0140] The switching element (SW_pa2) of the second RF power supply unit (150) corresponds to a transistor and may be referred to as a 'second switching element'. The control unit (300) can activate or deactivate the second RF power supply unit (150) by controlling the switching element (SW_pa2). The control unit (300) can control the operation of the second RF power supply unit (150) by adjusting the voltage applied to the switching element (SW_pa2). When the switching element (SW_pa2) is turned on, the operation of the second RF power supply unit (150) can be activated. When the switching element (SW_pa2) is turned off, the operation of the second RF power supply unit (150) can be deactivated.

[0141] The control unit (300) can activate the first RF power supply unit (140) and deactivate the second RF power supply unit (150) during the drying operation. The control unit (300) can deactivate the first RF power supply unit (140) and activate the second RF power supply unit (150) during the sterilization operation.

[0142] The first switch (SM) may be connected to the output terminal of the first RF power supply unit (140) or the output terminal of the second RF power supply unit (150). In addition, the first switch (SM) may be connected to an impedance matching circuit (160). The first switch (SM) may connect the impedance matching circuit (160) to the first RF power supply unit (140) or the second RF power supply unit (150).

[0143] The control unit (300) can control the first switch (SM) to connect the first RF power supply unit (140) and the impedance matching circuit (160) to perform a drying operation. The control unit (300) can control the first switch (SM) to connect the second RF power supply unit (150) and the impedance matching circuit (160) to perform a sterilization operation.

[0144] The impedance matching circuit (160) may be provided as a circuit in which a plurality of inductors (L), a plurality of capacitors (C), and a plurality of switches are connected in series and / or in parallel. The plurality of switches included in the impedance matching circuit (160) may be opened or closed under the control of the control unit (300). As the plurality of switches are controlled, impedance matching may be performed. In Fig. 9, the impedance matching circuit (160) is illustrated as including three parallel-connected inductors (L), three parallel-connected capacitors (C), and nine switches, but is not limited thereto. The structure of the impedance matching circuit (160) may be variously changed depending on the design.

[0145] A second switch (SE1) and a third switch (SE2) may be connected to the output terminal of the impedance matching circuit (160). The second switch (SE1) may connect the impedance matching circuit (160) and the drying electrode (90). The third switch (SE2) may connect the impedance matching circuit (160) and the sterilizing electrode (91). An inductor (Ldr) provided between the second switch (SE1) and the drying electrode (90) may prevent a spark from being generated when the second switch (SE1) is closed. An inductor (Lst) provided between the third switch (SE2) and the sterilizing electrode (91) may prevent a spark from being generated when the third switch (SE2) is closed.

[0146] In order to connect a plurality of drying electrodes (90) and a plurality of sterilizing electrodes (91) to the impedance matching circuit (160), a plurality of second switches (SE1) and a plurality of third switches (SE2) may be connected to the output terminal of the impedance matching circuit (160).

[0147] In response to the provision of a plurality of drying electrodes (90) and a plurality of sterilizing electrodes (91), it is also possible to provide a plurality of impedance matching circuits (160). For example, one drying electrode (90), one sterilizing electrode (91), and one impedance matching circuit (160) may be provided as a set. Each of the plurality of impedance matching circuits (160) may be connected to a first RF power supply unit (140) for a drying operation or to a second RF power supply unit (150) for a sterilizing operation.

[0148] The control unit (300) can control the impedance matching circuit (160) to match the output impedance of the first RF power supply unit (140) and the electrode impedance of the drying electrode (90) to perform the drying operation. The impedance matching between the first RF power supply unit (140) and the drying electrode (90) for the drying operation can be referred to as 'first impedance matching'.

[0149] The control unit (300) can control the impedance matching circuit (160) to match the output impedance of the second RF power supply unit (150) and the electrode impedance of the sterilizing electrode (91) to perform the sterilizing operation. The impedance matching between the second RF power supply unit (150) and the sterilizing electrode (91) for the sterilizing operation can be referred to as 'second impedance matching'.

[0150] The dryer (1) can alternately perform drying and sterilizing operations. To this end, the control unit (300) can control the impedance matching circuit (160) to perform a second impedance matching after the drying operation and before the sterilizing operation. The control unit (300) can control the impedance matching circuit (160) to perform a first impedance matching after the sterilizing operation and before the drying operation.

[0151] Fig. 10 illustrates a circuit structure of a dryer according to one embodiment when the dryer performs a drying operation.

[0152] Referring to FIG. 10, the control unit (300) of the dryer (1) can control the first switch (SM), the second switch (SE1), and the third switch (SE2) to connect the first RF power supply unit (140), the impedance matching circuit (160), and the drying electrode (90) to perform a drying operation.

[0153] The control unit (300) can control the first switch (SM) to connect the first RF power supply unit (140) and the impedance matching circuit (160) to perform the drying operation. The control unit (300) can close the second switch (SE1) to connect the impedance matching circuit (160) and the drying electrode (90). The control unit (300) can open the third switch (SE2) to cut off the connection between the impedance matching circuit (160) and the sterilizing electrode (91).

[0154] In addition, the control unit (300) can activate the first RF power supply unit (140) and deactivate the second RF power supply unit (150) during the drying operation. The control unit (300) can control the first RF power supply unit (140) to apply a first voltage and a first current to the drying electrodes (90) during the drying operation. The first voltage and the first current can be applied to each of the plurality of drying electrodes (90). Accordingly, an electric field for drying the object can be generated within the drum (20) during the drying operation.

[0155] Fig. 11 illustrates a circuit structure of a dryer according to one embodiment when the dryer performs a sterilization operation.

[0156] Referring to FIG. 11, the control unit (300) of the dryer (1) can control the first switch (SM), the second switch (SE1) and the third switch (SE2) to connect the second RF power supply unit (150), the impedance matching circuit (160) and the sterilizing electrode (91) to perform a sterilizing operation.

[0157] The control unit (300) can control the first switch (SM) to connect the second RF power supply unit (150) and the impedance matching circuit (160) to perform a sterilization operation. The control unit (300) can open the second switch (SE1) to block the connection between the impedance matching circuit (160) and the drying electrode (90). The control unit (300) can close the third switch (SE2) to connect the impedance matching circuit (160) and the sterilization electrode (91).

[0158] In addition, the control unit (300) can deactivate the first RF power supply unit (140) and activate the second RF power supply unit (150) during the sterilization operation. The control unit (300) can control the second RF power supply unit (150) to apply a second voltage and a second current to the sterilizing electrode (91) during the sterilization operation. The second voltage and the second current can be applied to each of the plurality of sterilizing electrodes (91). Accordingly, an electric field for sterilizing the target object can be generated within the drum (20) during the sterilization operation.

[0159] The first voltage applied to the drying electrode (90) for the drying operation may be lower than the second voltage applied to the sterilizing electrode (91) for the sterilizing operation. The first current applied to the drying electrode (90) for the drying operation may be greater than the second current applied to the sterilizing electrode (91) for the sterilizing operation.

[0160] Fig. 12 is a graph illustrating an example of a method for controlling a drying time interval for a drying operation. Fig. 13 is a graph illustrating another example of a method for controlling a drying time interval for a drying operation.

[0161] As described above, the control unit (300) of the dryer (1) can alternately perform the drying operation and the sterilizing operation multiple times. The total operating time of the dryer (1) can be divided into a drying time and a sterilizing time. The drying time represents the sum of the drying time intervals for each of the plurality of drying operations. The sterilizing time represents the sum of the sterilizing time intervals for each of the plurality of sterilizing operations. In order to maximize drying efficiency, the drying time can be set longer than the sterilizing time.

[0162] Referring to FIGS. 12 and 13, the drying operation and the sterilizing operation may be alternately performed from the time point t1 when the operation of the dryer (1) starts to the time point t_end when the operation of the dryer (1) ends. That is, the drying operation and the sterilizing operation may be alternately and repeatedly performed. For example, the drying operation may be performed from the time point t1 to the time point t2, and the sterilizing operation may be performed from the time point t3 to the time point t4. Impedance matching (Im1) between the second RF power supply unit (150) and the sterilizing electrode (91) may be performed between the time points t2 and t3. Since the impedance matching simply changes the inductance and capacitance of the impedance matching circuit (160), the time required for the impedance matching is very short.

[0163] At time t4, the sterilization operation is completed, and impedance matching (Im2) between the first RF power supply unit (140) and the drying electrode (90) may be performed between time t4 and time t5. The drying operation may be performed again from time t5 to time t6. When the drying operation is completed at time t6, impedance matching (Im3) between the second RF power supply unit (150) and the sterilizing electrode (91) may be performed again between time t6 and time t7, and then the sterilization operation may be performed from time t7 to time t8. When the sterilization operation is completed, impedance matching (Im4) between the first RF power supply unit (140) and the drying electrode (90) may be performed again between time t8 and time t9, and then the drying operation may be performed from time t9 to time t10.

[0164] The total operating time of the dryer (1) from the time point t1 to the time point t_end may include multiple drying time intervals and multiple sterilization time intervals. The dryer (1) may adjust the drying time intervals for each of the multiple drying operations while alternately performing the multiple drying operations and the multiple sterilization operations.

[0165] During multiple drying operations, the moisture content of an object can decrease linearly or nonlinearly. Initially, moisture contained in the object is rapidly removed, and over time, the change in moisture content gradually decreases, converging to zero. Adjusting the drying time interval to account for these moisture content changes can improve both drying and sterilization efficiency.

[0166] For example, as illustrated in FIG. 12, the dryer (1) can linearly or nonlinearly reduce the drying time interval during the intensive drying time from time t1 to time tn. Comparing the first drying time interval (Dr1) from time t1 to time t2, the second drying time interval (Dr2) from time t5 to time t6, and the third drying time interval (Dr3) from time t9 to time t10, the first drying time interval (Dr1) is the longest, and the third drying time interval (Dr3) is the shortest. The second drying time interval (Dr2) is shorter than the first drying time interval (Dr1) and longer than the third drying time interval (Dr4). N drying operations can be performed within the intensive drying time. The first drying time interval (Dr1) of the first drying operation can be set to be the longest, and the n-th drying time interval (Dr_n) of the n-th drying operation can be set to be the shortest.

[0167] The dryer (1) can maintain the drying time interval at a constant level without further reducing the drying time interval after the intensive drying time has elapsed. That is, the drying time intervals of the drying operations performed after the time point tn can all be the same. In addition, the drying time intervals of the drying operations performed after the time point tn can be the same as the sterilization time interval. The (n+1)-th drying time interval (Dr_n+1) of the (n+1)-th drying operation can be the same as the (n)-th drying time interval (Dr_n).

[0168] During the entire operation time of the dryer (1), multiple sterilization time intervals can all be set to be the same. That is, the sterilization time intervals can be maintained constant. For example, in FIGS. 12 and 13, the first sterilization time interval (St1) from time t3 to time t4, the second sterilization time interval (St2) from time t7 to time t8, the third sterilization time interval (St3) from time t11 to time t12, and the nth sterilization time interval (St_n) after time tn are all the same. In addition, the nth sterilization time interval (St_n) can be the same as the nth drying time interval (Dr_n).

[0169] The sterilization time interval is not limited to the example, and multiple sterilization time intervals can also be adjusted.

[0170] For another example, as illustrated in FIG. 13, the control unit (300) can maintain a constant drying time interval during a predetermined intensive drying time, and decrease the drying time interval based on the elapse of the predetermined intensive drying time. Comparing the first drying time interval (Dr1), the second drying time interval (Dr2), the third drying time interval (Dr3), and the n-th drying time interval (Dr_n) in FIG. 13, the first drying time interval (Dr1), the second drying time interval (Dr2), the third drying time interval (Dr3), and the n-th drying time interval (Dr_n) are the same. That is, the drying time intervals for n drying operations performed within the intensive drying time can be set to be the same. In addition, the drying time intervals of each of the plurality of drying operations performed during the intensive drying time are greater than the sterilization time interval.

[0171] Comparing Figures 12 and 13, the number of times the sterilization operation is performed within the intensive drying time differs. That is, the number of sterilization operations within the intensive drying time is greater in Figure 12. If the initial drying time interval is maintained constant during the intensive drying time, the sterilization effect may be slightly reduced, but the drying effect can be maximized.

[0172] The dryer (1) can reduce the drying time interval when the intensive drying time has elapsed. The nth sterilization time interval (St_n) after the time point tn and the n+1th drying time interval (Dr_n+1) can be the same.

[0173] Meanwhile, the intensive drying time and drying time interval can also be adjusted based on the amount of the object or user input. For example, when the amount of the object is relatively small or the sterilization intensity is set relatively high by user input, the dryer (1) can linearly or non-linearly reduce the drying time interval within the intensive drying time as described in Fig. 12. Conversely, when the amount of the object is relatively large or the sterilization intensity is set relatively low by user input, the dryer (1) can maintain the drying time interval within the intensive drying time at a constant level as described in Fig. 13.

[0174] Fig. 14 is a flowchart illustrating a method for controlling a dryer according to one embodiment.

[0175] Referring to Fig. 14, the dryer (1) can perform a drying operation to dry an object accommodated in a drum (20) (1401). To perform the drying operation, the control unit (300) can control the first switch (SM) so that the first RF power supply unit (140) and the impedance matching circuit (160) are connected. The control unit (300) can close the second switch (SE1) so that the impedance matching circuit (160) and the drying electrode (90) are connected. The control unit (300) can open the third switch (SE2) so that the connection between the impedance matching circuit (160) and the sterilizing electrode (91) is cut off. The control unit (300) can activate the first RF power supply unit (140) and deactivate the second RF power supply unit (150) during the drying operation. The drying operation can be performed during the drying time interval.

[0176] Although not shown, before performing the drying operation of step 1401, the dryer (1) can perform impedance matching (first impedance matching) to match the output impedance of the first RF power supply unit (140) and the electrode impedance of the drying electrode (90).

[0177] The dryer (1) can perform impedance matching (second impedance matching) to match the output impedance of the second RF power supply unit (150) and the electrode impedance of the sterilizing electrode (91) before the sterilizing operation after the drying operation (1402).

[0178] After impedance matching between the second RF power supply unit (150) and the sterilizing electrode (91), the dryer (1) can perform a sterilizing operation to sterilize the object (1403). The control unit (300) can control the first switch (SM) to connect the second RF power supply unit (150) and the impedance matching circuit (160) to perform the sterilizing operation. The control unit (300) can open the second switch (SE1) to cut off the connection between the impedance matching circuit (160) and the drying electrode (90). The control unit (300) can close the third switch (SE2) to connect the impedance matching circuit (160) and the sterilizing electrode (91). In addition, the control unit (300) can deactivate the first RF power supply unit (140) and activate the second RF power supply unit (150) during the sterilizing operation. The sterilization operation can be performed during the sterilization time interval.

[0179] After the sterilization operation, the dryer (1) can perform impedance matching (first impedance matching) again to match the output impedance of the first RF power supply unit (140) and the electrode impedance of the drying electrode (90) (1404).

[0180] The dryer (1) can determine whether the drying of the object is complete (1405). For example, the control unit (300) of the dryer (1) can determine the dryness of the object based on a change in the magnitude of the voltage detected by the drying electrode (90) and / or the sterilizing electrode (91) and / or a change in the electrode impedance. The control unit (300) can determine the drying completion based on whether the dryness of the object reaches a tolerance range of a predetermined reference dryness. In addition, the control unit (300) can determine the drying completion when the electrode impedance of the drying electrode (90) and / or the sterilizing electrode (91) is greater than or equal to a predetermined threshold value.

[0181] If the drying of the object is not completed, the dryer (1) can continue to perform the drying operation. The dryer (1) can alternately perform the drying operation and the sterilization operation multiple times until the completion of drying is determined.

[0182] Fig. 15 is a flowchart illustrating an example of time control of a drying operation in the control method of a dryer described in Fig. 14.

[0183] Referring to Fig. 15, steps 1501, 1502, 1503, 1504, and 1505 are identical to steps 1401, 1402, 1403, 1404, and 1405 described in Fig. 14. If the drying operation of the object is not completed after the drying operation is performed during the drying time interval, the dryer (1) can determine whether the intensive drying time has elapsed (1506).

[0184] If the intensive drying time has not elapsed, the control unit (300) of the dryer (1) can reduce the drying time interval for the drying operation (1507). The control unit (300) can linearly or non-linearly reduce the drying time interval for each of the plurality of drying operations performed during the intensive drying time. The control unit (300) can maintain the drying time interval for the drying operation performed after the intensive drying time has elapsed at a constant level. In other words, the dryer (1) can gradually reduce the drying time interval during the intensive drying time, and not reduce the drying time interval when the intensive drying time has elapsed. Through this, the dryer (1) can increase both drying efficiency and sterilization efficiency.

[0185] Fig. 16 is a flowchart illustrating another example of time control of a drying operation in the control method of a dryer described in Fig. 14.

[0186] Referring to FIG. 16, steps 1601, 1602, 1603, 1604, and 1605 are identical to steps 1401, 1402, 1403, 1404, and 1405 described in FIG. 14. Step 1606 is identical to step 1506 described in FIG. 15.

[0187] The control unit (300) of the dryer (1) can maintain a constant drying time interval for each of the plurality of drying operations performed during the intensive drying time. The drying time intervals for n drying operations performed within the intensive drying time can be set to be the same. In this case, the drying time intervals for each of the plurality of drying operations performed during the intensive drying time are greater than the sterilization time interval. The control unit (300) can reduce the drying time interval of the drying operation performed after the intensive drying time has elapsed (1607).

[0188] According to one embodiment, a dryer (1) comprises: a drum; a plurality of drying electrodes spaced apart from each other along an outer circumference of the drum; a plurality of sterilizing electrodes arranged between the plurality of drying electrodes along an outer circumference of the drum and having a size smaller than the plurality of drying electrodes; a first RF power supply unit and a second RF power supply unit for generating RF signals; an impedance matching circuit for performing first impedance matching between the first RF power supply unit and the plurality of drying electrodes or second impedance matching between the second RF power supply unit and the plurality of sterilizing electrodes; a first switch configured to connect the impedance matching circuit to the first RF power supply unit or the second RF power supply unit; a second switch configured to connect the impedance matching circuit to the plurality of drying electrodes; a third switch configured to connect the impedance matching circuit to the plurality of sterilizing electrodes; And, in order to alternately perform the drying operation and the sterilization operation, it may include a control unit that controls the first RF power supply unit, the second RF power supply unit, the impedance matching circuit, the first switch, the second switch, and the third switch.

[0189] The above control unit can alternately perform the drying operation and the sterilizing operation multiple times (e.g., two or more times). The control unit can adjust the drying time interval for each of the plurality of drying operations while alternately performing the plurality of drying operations and the plurality of sterilizing operations.

[0190] The above control unit can linearly or nonlinearly reduce the drying time interval for each drying operation performed during a predetermined intensive drying time, and maintain the drying time interval at a constant level based on the elapse of the predetermined intensive drying time.

[0191] The above control unit can maintain the drying time interval for each drying operation performed for a predetermined intensive drying time at a constant level, and can reduce the drying time interval based on the elapse of the predetermined intensive drying time.

[0192] The control unit can activate the first RF power supply unit and deactivate the second RF power supply unit during the drying operation. The control unit can deactivate the first RF power supply unit and activate the second RF power supply unit during the sterilization operation.

[0193] The control unit may control the first RF power supply unit to apply a first voltage and a first current to the plurality of drying electrodes during the drying operation. The control unit may control the second RF power supply unit to apply a second voltage and a second current to the plurality of sterilizing electrodes during the sterilizing operation. The first voltage may be lower than the second voltage, and the first current may be greater than the second current.

[0194] The control unit may control the impedance matching circuit to perform the second impedance matching after the drying operation is performed and before the sterilizing operation is performed. The control unit may control the impedance matching circuit to perform the first impedance matching after the sterilizing operation is performed and before the drying operation is performed. The control unit may control the first switch, the second switch, and the third switch to connect the first RF power supply unit, the impedance matching circuit, and the plurality of drying electrodes to perform the drying operation. The control unit may control the first switch, the second switch, and the third switch to connect the second RF power supply unit, the impedance matching circuit, and the plurality of sterilizing electrodes to perform the sterilizing operation.

[0195] The control unit may control the first switch to connect the first RF power supply unit and the impedance matching circuit to perform the drying operation, close the second switch to connect the impedance matching circuit and the plurality of drying electrodes, and open the third switch to block the connection between the impedance matching circuit and the plurality of sterilizing electrodes.

[0196] The control unit may control the first switch to connect the second RF power supply unit and the impedance matching circuit to perform the sterilization operation, open the second switch to block the connection between the impedance matching circuit and the plurality of drying electrodes, and close the third switch to connect the impedance matching circuit and the plurality of sterilization electrodes.

[0197] The first width of each of the plurality of drying electrodes may be provided to be larger than the second width of each of the plurality of sterilizing electrodes.

[0198] The first thickness of each of the plurality of drying electrodes may be provided to be greater than the second thickness of each of the plurality of sterilizing electrodes.

[0199] A method for controlling a dryer comprising a drum and a plurality of drying electrodes spaced apart along an outer surface of the drum and a plurality of sterilizing electrodes arranged between the plurality of drying electrodes along an outer surface of the drum, the dryer may include a first switch configured to connect an impedance matching circuit to a first RF power supply unit or a second RF power supply unit; a second switch configured to connect the impedance matching circuit and the plurality of drying electrodes; and a third switch configured to connect the impedance matching circuit and the plurality of sterilizing electrodes.

[0200] A method for controlling a dryer according to one embodiment may include: performing a drying operation by controlling the first switch, the second switch, and the third switch to connect the first RF power supply unit, the impedance matching circuit, and the plurality of drying electrodes; performing a sterilizing operation by controlling the first switch, the second switch, and the third switch to connect the second RF power supply unit, the impedance matching circuit, and the plurality of sterilizing electrodes; and alternately performing the drying operation and the sterilizing operation.

[0201] Alternatingly performing the above drying operation and the above sterilizing operation may include controlling a drying time interval for each of the plurality of drying operations while alternately performing the plurality of drying operations and the plurality of sterilizing operations.

[0202] Controlling the drying time interval for each of the plurality of drying operations may include linearly or non-linearly decreasing the drying time interval during a predetermined intensive drying time; and maintaining the drying time interval constant based on the elapse of the predetermined intensive drying time.

[0203] Controlling the drying time interval for each of the plurality of drying operations may include maintaining the drying time interval constant for a predetermined intensive drying time; and decreasing the drying time interval based on the elapse of the predetermined intensive drying time.

[0204] Performing the drying operation may include controlling the first RF power supply unit to apply a first voltage and a first current to the plurality of drying electrodes. Performing the sterilizing operation may include controlling the second RF power supply unit to apply a second voltage and a second current to the plurality of sterilizing electrodes. The first voltage may be lower than the second voltage, and the first current may be greater than the second current.

[0205] Alternating the drying operation and the sterilizing operation may include controlling the impedance matching circuit to perform a first impedance matching between the first RF power supply unit and the plurality of drying electrodes after the sterilizing operation is performed and before the drying operation is performed; and controlling the impedance matching circuit to perform a second impedance matching between the second RF power supply unit and the plurality of sterilizing electrodes after the drying operation is performed and before the sterilizing operation is performed.

[0206] Performing the drying operation may include controlling the first switch so that the first RF power supply unit and the impedance matching circuit are connected; closing the second switch so that the impedance matching circuit and the plurality of drying electrodes are connected; and opening the third switch so that the connection between the impedance matching circuit and the plurality of sterilizing electrodes is cut off.

[0207] Performing the sterilizing operation may include controlling the first switch so that the second RF power supply unit and the impedance matching circuit are connected; opening the second switch so that the connection between the impedance matching circuit and the plurality of drying electrodes is cut off; and closing the third switch so that the impedance matching circuit and the plurality of sterilizing electrodes are connected.

[0208] The disclosed dryer and control method can perform both drying and sterilizing operations using separately provided drying electrodes and sterilizing electrodes.

[0209] The disclosed dryer and control method can provide power suitable for drying an object and power suitable for sterilizing the object.

[0210] The disclosed dryer and control method can maximize the drying efficiency of a target object while simultaneously achieving a sterilization effect on the target object. In addition to the sterilization effect, a deodorization effect on the target object can also be achieved.

[0211] Meanwhile, the disclosed embodiments may be implemented in the form of a storage medium storing computer-executable instructions. The instructions may be stored in the form of program code, and when executed by a processor, may generate program modules to perform the operations of the disclosed embodiments.

[0212] A device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, the term "non-transitory storage medium" simply means a tangible device that does not contain signals (e.g., electromagnetic waves). This term does not distinguish between cases where data is permanently stored in the storage medium and cases where data is temporarily stored. For example, a "non-transitory storage medium" may include a buffer in which data is temporarily stored.

[0213] The methods according to various embodiments disclosed in this document may be provided as included in a computer program product. The computer program product may be traded as a product between a seller and a buyer. 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 may be distributed online (e.g., downloaded or uploaded) via an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product (e.g., a downloadable app) may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0214] The disclosed embodiments have been described with reference to the attached drawings as described above. Those skilled in the art will understand that the present invention can be implemented in forms other than the disclosed embodiments without altering the technical spirit or essential features of the present invention. The disclosed embodiments are illustrative and should not be construed as limiting.

Claims

1. Drum; A plurality of dry electrodes arranged along the outer surface of the drum; A plurality of sterilizing electrodes arranged between the plurality of drying electrodes along the outer surface of the drum; A first RF power supply unit and a second RF power supply unit for generating an RF signal; An impedance matching circuit that performs first impedance matching between the first RF power supply unit and the plurality of drying electrodes or second impedance matching between the second RF power supply unit and the plurality of sterilizing electrodes; A first switch configured to connect the impedance matching circuit to the first RF power supply unit or the second RF power supply unit; A second switch configured to connect the impedance matching circuit and the plurality of dry electrodes; A third switch configured to connect the impedance matching circuit and the plurality of sterilizing electrodes; and A dryer comprising a control unit that controls the first RF power supply unit, the second RF power supply unit, the impedance matching circuit, the first switch, the second switch, and the third switch to alternately perform a drying operation and a sterilizing operation.

2. In paragraph 1, The above control unit The above drying operation and the above sterilization operation are alternately performed at least twice, A dryer that controls the drying time interval for each of the plurality of drying operations while alternately performing a plurality of drying operations and a plurality of sterilizing operations.

3. In paragraph 2, The above control unit Linearly or non-linearly reduce the drying time interval for each drying operation performed during a predetermined intensive drying time, A dryer that maintains a constant drying time interval for each drying operation performed after the above-determined concentrated drying time has elapsed.

4. In paragraph 2, The above control unit Maintaining the above drying time interval for each drying operation performed during a predetermined concentrated drying time constant, A dryer that reduces the drying time interval for each drying operation performed after the above-determined concentrated drying time has elapsed.

5. In paragraph 1, The above control unit During the above drying operation, the first RF power supply unit is activated and the second RF power supply unit is deactivated, A dryer that deactivates the first RF power supply unit and activates the second RF power supply unit during the above sterilization operation.

6. In paragraph 1, The above control unit Controlling the first RF power supply unit to apply a first voltage and a first current to the drying electrode during the drying operation; Controlling the second RF power supply unit to apply a second voltage and a second current to the sterilizing electrode during the sterilizing operation; A dryer wherein the first voltage is lower than the second voltage and the first current is greater than the second current.

7. In paragraph 1, The above control unit Controlling the impedance matching circuit to perform the second impedance matching before the sterilization operation is performed after the drying operation is performed, A dryer that controls the impedance matching circuit to perform the first impedance matching before the drying operation is performed after the sterilization operation is performed.

8. In paragraph 1, The above control unit Controlling the first switch, the second switch and the third switch to connect the first RF power supply unit, the impedance matching circuit and the plurality of drying electrodes to perform the drying operation; A dryer that controls the first switch, the second switch, and the third switch to connect the second RF power supply unit, the impedance matching circuit, and the plurality of sterilizing electrodes to perform the sterilizing operation.

9. In paragraph 8, The above control unit A dryer that controls the first switch to connect the first RF power supply unit and the impedance matching circuit to perform the drying operation, closes the second switch to connect the impedance matching circuit and the plurality of drying electrodes, and opens the third switch to block the connection between the impedance matching circuit and the plurality of sterilizing electrodes.

10. In paragraph 8, The above control unit A dryer that controls the first switch to connect the second RF power supply unit and the impedance matching circuit to perform the sterilization operation, opens the second switch to block the connection between the impedance matching circuit and the plurality of drying electrodes, and closes the third switch to connect the impedance matching circuit and the plurality of sterilizing electrodes.

11. In paragraph 1, A dryer, wherein the first width of each of the plurality of drying electrodes is larger than the second width of each of the plurality of sterilizing electrodes.

12. In paragraph 1, A control method for a dryer, wherein the first thickness of each of the plurality of drying electrodes is provided to be greater than the second thickness of each of the plurality of sterilizing electrodes.

13. A method for controlling a dryer including a drum and a plurality of drying electrodes arranged along the outer surface of the drum and a plurality of sterilizing electrodes arranged between the plurality of drying electrodes along the outer surface of the drum, The above dryer A first switch configured to connect the impedance matching circuit to a first RF power supply or a second RF power supply; A second switch configured to connect the impedance matching circuit and the plurality of dry electrodes; and A third switch configured to connect the impedance matching circuit and the plurality of sterilizing electrodes; The above control method A drying operation is performed by controlling the first switch, the second switch, and the third switch to connect the first RF power supply unit, the impedance matching circuit, and the plurality of drying electrodes; A sterilizing operation is performed by controlling the first switch, the second switch, and the third switch to connect the second RF power supply unit, the impedance matching circuit, and the plurality of sterilizing electrodes; A control method for a dryer, comprising: alternately performing the drying operation and the sterilizing operation.

14. In paragraph 13, Alternating the above drying operation and the above sterilization operation A control method for a dryer, comprising: adjusting a drying time interval for each of a plurality of drying operations while alternately performing a plurality of drying operations and a plurality of sterilizing operations.

15. In paragraph 14, Controlling the drying time interval for each of the above multiple drying operations is as follows: Linearly or non-linearly reducing the drying time interval for each drying operation performed during a predetermined concentrated drying time; A control method for a dryer, comprising: maintaining the drying time interval constant based on the elapse of the above-determined concentrated drying time.

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