Can heating device

Abstract

A can heating device is disclosed. The can heating device completes the heating of multiple cans within a target time defined for each can by comparing the detected temperature value of each of the multiple cans with a target temperature value. Additionally, the can heating device easily sets the output value of a working coil group by reading an information code attached to the can. Furthermore, the can heating device heats multiple cans simultaneously by efficiently setting the connection relationship between a plurality of switching elements and a plurality of working coil groups within the driving circuit.

Description

Technology Field

[0001] The present invention relates to a can heating device capable of simultaneously heating a plurality of cans and rapidly increasing the temperature of the plurality of cans. Background Technology

[0003] A heating device for beverage cans used in convenience stores, etc., accommodates multiple beverage cans inside and heats the accommodated cans to a predetermined temperature to increase or maintain the temperature of the beverage cans. A user removes a beverage can from the heating device and drinks the beverage contained in the can.

[0004] Meanwhile, it is important for the beverage can heating device to heat the can to the temperature desired by the user quickly. To this end, temperature sensors that measure the temperature of the beverage can are used.

[0005] As prior art related to this, there are U.S. registered patent (US9674900) and Japanese registered patents (JP3259808 and JP3706928). The prior art is described below.

[0006] Figure 1 is a diagram illustrating the structure of an induction heating device for heating a conventional beverage can.

[0007] For reference, FIG. 1 is an excerpt from FIG. 1 of U.S. Patent 9674900. The reference numerals in FIG. 1 are limited to the components of FIG. 1.

[0008] Referring to FIG. 1, a resealable can (1) is received in a can holder (6), and a heating coil (9) is placed on the side of the can holder (6). The heating coil (9) heats the can (1) received in the can holder (6). A motor (7) is connected to the bottom portion (11) of the can holder (6), and based on the driving of the motor (7), the can holder (6) rotates about a central axis (A), and accordingly, the can (1) rotates. A radiation thermometer (10) measures the temperature of the cap (3) of the can (1), and if the measured temperature is a set temperature, the rotation of the can holder (6) and the can (1) stops.

[0009] Figure 2 is a drawing illustrating the structure of another conventional beverage can heating device.

[0010] For reference, FIG. 2 is an excerpt from FIG. 1 of Japanese registered patent JP3259808. The reference numerals in FIG. 2 are limited only to the components of FIG. 2.

[0011] Referring to FIG. 2, a cylindrical can guide (4) is positioned on the upper part of a rotating platform (5), and a can (3) is received in the space formed by the can guide (4) and the rotating platform (5). A heating coil (2) is positioned adjacent to the side of the can guide (4), and the heating coil (2) heats the received can (3). A rotating platform motor (6) is connected to the lower part of the rotating platform (5), and the rotating platform (5) rotates based on the driving of the rotating platform motor (6), and the can (3) rotates accordingly. A radiation temperature sensor (7) measures the temperature of the side of the can (3). A barcode reader (19) identifies a barcode containing information such as the contents, price, and manufacturing date of the can (3), and a manager manages the can (3) using the information contained in the barcode.

[0012] Figure 3 is a diagram illustrating the structure of another conventional beverage can heating device.

[0013] For reference, FIG. 3 is an excerpt from FIG. 1 of Japanese registered patent JP3706928. The reference numerals in FIG. 3 are limited only to the components of FIG. 3.

[0014] Referring to FIG. 3, a can (50) containing a beverage (5) is placed horizontally, and a heating coil (1) is placed adjacent to the can (50). The heating coil (1) heats the can (50). The side of the can (50) comes into contact with rollers (2, 3), and among the contacted rollers (2, 3), roller (2) is connected to a motor (4), and the can (50) rotates based on the operation of the rollers (2, 3). As the can (50) rotates, the temperature of the contents contained in the can (50) increases rapidly. A temperature sensor (7) measures the temperature of the end of the can (50). Based on the measured temperature, the heating time of the can (50) is determined.

[0015] Meanwhile, the conventional can heating device mentioned above has the disadvantage that the temperature of the can does not increase quickly because the heating coil and the can are somewhat separated.

[0016] In addition, a conventional can heating device may include two or more induction heating devices, and two or more cans may be heated using two or more induction heating devices.

[0017] However, for induction heating of two or more cans, conventional can heating devices must be equipped with an inverter corresponding to each heating coil. In this case, there are disadvantages such as the structure of the device becoming complex, the size of the device increasing, and the manufacturing cost increasing.

[0018] In addition, when heating two or more cans simultaneously, conventional can heating devices have the problem that the heating of two or more cans is completed at different times. That is, the optimal temperature for each of the two or more cans may differ, and if heating is completed at different times, the manager may experience difficulties in managing the cans. The problem to be solved

[0019] The objective of the present invention is to provide a can heating device capable of heating multiple cans simultaneously using a single inverter.

[0020] In addition, the objective of the present invention is to provide a can heating device capable of terminating the heating of multiple cans at the same time using a single inverter.

[0021] In addition, the objective of the present invention is to provide a can heating device capable of controlling the heating of a can using an information code attached to the can.

[0022] In addition, the objective of the present invention is to provide a can heating device having a simple and slim structure.

[0023] In addition, the objective of the present invention is to provide a can heating device capable of increasing the temperature of the contents inside a can in a short period of time.

[0024] The objective of the present invention is to provide a can heating device capable of heating cans of various diameters.

[0025] The objectives of the present invention are not limited to those mentioned above, and other objectives and advantages of the present invention not mentioned may be understood from the following description and will be more clearly understood by the embodiments of the present invention. means of solving the problem

[0027] A can heating device according to one embodiment of the present invention can complete the heating of a plurality of cans within a target time defined for each can by comparing the detected temperature value of each of the plurality of cans with a target temperature value.

[0028] A can heating device according to one embodiment of the present invention can easily set the output value of a working coil group by reading an information code attached to a can.

[0029] A can heating device according to one embodiment of the present invention can heat multiple cans simultaneously by efficiently setting the connection relationship between a plurality of switching elements and a plurality of working coil groups within a driving circuit.

[0030] A can heating device according to one embodiment of the present invention can simplify the structure of the driving circuit by heating a plurality of cans using a single inverter.

[0031] A can heating device according to one embodiment of the present invention can accommodate cans of various diameters by dividing the bobbin into a plurality of sub-bobbins.

[0032] A can heating device according to one embodiment of the present invention can rotate a received can by using a roller.

[0033] A can heating device according to one embodiment of the present invention comprises a plurality of can receiving portions for receiving a plurality of cans, a plurality of working coils disposed adjacent to each of the plurality of can receiving portions, a plurality of temperature sensors for detecting the temperature of each of the plurality of cans, and a driving circuit portion for driving each of the plurality of working coils, wherein the driving circuit portion comprises an inverter that provides driving power to each of the plurality of working coils including the plurality of switching elements, and an inverter control portion that controls the turn-on and turn-off of the plurality of switching elements, wherein the inverter control portion provides a switching control signal to the plurality of switching elements to compare the detected temperature value of each of the plurality of cans with a plurality of target temperature values ​​corresponding to each of the plurality of cans so that heating of each of the plurality of cans is completed within a corresponding target time, and the output value of each of the plurality of working coil groups is controlled by the switching control signal.

[0034] A can heating device according to another embodiment of the present invention comprises a bobbin in which a can is received, a lower plate disposed at the bottom of the bobbin, a working coil wound on the outer surface of the bobbin and heating the received can, a temperature sensor that detects the temperature of the bottom surface of the received can, a scanning unit that scans an information code attached to the received can, and a driving circuit unit that drives each of the plurality of working coils, wherein the driving circuit unit controls the working coils so that heating of the can is completed within a corresponding target time based on the detected temperature value of the can and the scanned information code. Effects of the invention

[0036] According to the present invention, the convenience of can management for a manager can be improved by completing the heating of a plurality of cans within a target time defined for each can.

[0037] In addition, according to the present invention, the heating of the can can be controlled in a simple manner by setting the output value of the working coil group using an information code attached to the can.

[0038] According to the present invention, by simplifying the structure of the driving circuit, the complexity and size of the structure of the can heating device can be reduced, and the manufacturing cost of the can heating device can be reduced.

[0039] According to the present invention, by configuring the structure of the bobbin to accommodate all cans of various diameters, all cans of various diameters can be heated.

[0040] According to the present invention, by rotating the received can, the temperature of the can can be rapidly increased.

[0041] In addition to the effects described above, the specific effects of the present invention are described together with the specific details for implementing the invention below. Brief explanation of the drawing

[0043] Figures 1 to 3 are drawings illustrating the structure of a conventional can heating device. FIG. 4 is a side cross-sectional view of a can heating device according to one embodiment of the present invention. FIG. 5 is a cross-sectional view of a can heating device according to one embodiment of the present invention. FIG. 6 is a perspective view of an induction heating device according to one embodiment of the present invention. FIG. 7 is an exploded perspective view of an induction heating device according to one embodiment of the present invention. FIG. 8 is a perspective view illustrating a shape in which a can is accommodated inside an induction heating device according to one embodiment of the present invention. FIG. 9 is a plan view illustrating the concept of a can being introduced into the interior of an induction heating device according to one embodiment of the present invention. FIG. 10 is a circuit diagram illustrating the schematic structure of a driving circuit section according to one embodiment of the present invention. FIGS. 11 and FIGS. 12 are drawings illustrating a switching control signal according to an embodiment of the present invention. FIG. 13 is a flowchart of a control method for a can heating device according to one embodiment of the present invention. Specific details for implementing the invention

[0044] The aforementioned objectives, features, and advantages are described in detail below with reference to the attached drawings, thereby enabling those skilled in the art to easily implement the technical concept of the present invention. In describing the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0045] In the following, the statement that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0046] In addition, where it is stated that one component is "connected," "combined," or "connected" to another component, it should be understood that while the components may be directly connected or connected to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "connected" through another component.

[0047] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0049] FIG. 4 is a side cross-sectional view of a can heating device (100) according to one embodiment of the present invention, and FIG. 5 is a front cross-sectional view of a can heating device (100) according to one embodiment of the present invention.

[0050] Referring to FIGS. 4 and 5, a can heating device (100) according to one embodiment of the present invention includes a housing (200), a plurality of covers (300), a plurality of induction heating devices (400), and a driving circuit unit (600).

[0051] Meanwhile, the components included in the can heating device (100) are not limited to the embodiments shown in FIGS. 4 and FIGS. 5, and some components may be added, changed, or deleted as needed.

[0052] The housing (200) forms the body of the can heating device (100) and includes a plurality of internal spaces. A plurality of induction heating devices (400) are located in each of the plurality of internal spaces. The housing (200) can be implemented in various modifications within the range of accommodating the can heating device (100), but for convenience of explanation, in the embodiment of the present invention, the components shown in FIGS. 4 and FIGS. 5 will be used as examples.

[0053] Each of the plurality of induction heating devices (400) accommodates a can (500) and heats the accommodated can (500).

[0054] Each of the plurality of induction heating devices (400) includes a working coil group (WCG). That is, the can heating device (100) includes a plurality of working coil groups (WCG). A working coil group (WCG) includes one or more electrically connected working coils (WC). That is, a working coil group (WCG) may include one working coil (WC) or two or more electrically connected working coils (WC).

[0055] Meanwhile, referring to FIG. 4, each of the plurality of induction heating devices (400) may be positioned in a corresponding internal space by being tilted at a predetermined angle from the vertical direction of the horizontal line. However, the present invention is not limited thereto, and the plurality of induction heating devices (400) may be positioned in a plurality of internal spaces in various positions. For example, the induction heating devices (400) may be positioned vertically or horizontally in the internal space.

[0056] A portion of the outer surface of the housing (200) is open, and a plurality of covers (300) are installed on the open portion of the housing (200). Various modifications can be implemented within the technical concept of installing the plurality of covers (300) so that a portion of the outer surface of the housing (200) can be opened and closed.

[0057] Each of the multiple covers (300) may be positioned to face each other with an open end of a plurality of induction heating devices (400). When the cover (300) is opened, a can (500) may be received into the interior of the induction heating device (400). When the insertion of the can (500) is complete, the cover (300) may be closed.

[0058] The driving circuit unit (600) drives a plurality of working coil groups (WCG) included in each of the plurality of induction heating devices (400). The driving circuit unit (600) includes one inverter and uses one inverter to provide driving power to the plurality of working coil groups (WCG). This will be explained in more detail below.

[0059] Meanwhile, although not shown in FIGS. 4 and 5, the can heating device (100) may further include a control unit and an output unit.

[0060] The control unit performs overall control of heating the can (500). That is, as described below, the control unit controls the operation of heating the can (500).

[0061] The control unit refers to a processor-based device. For example, the processor may include one or more of a central processing unit (CPU), an application processor, or a communication processor.

[0062] The output unit is a device that displays specific information to a user. As an example, the output unit may include a display and a speaker. The display may be composed of a liquid crystal display (LCD), a light-emitting diode display (LED), an organic light-emitting diode display (OLED), etc., and is a device capable of displaying an image or image frame to a user. The speaker outputs a sound signal to the user.

[0063] Meanwhile, the shape of each of the multiple induction heating devices (400) may be identical. Hereinafter, for the convenience of explanation, the structure and operation of one induction heating device (400) will be described on behalf of the multiple induction heating devices (400).

[0064] FIG. 6 is a perspective view of an induction heating device (400) according to one embodiment of the present invention. FIG. 7 is an exploded perspective view of an induction heating device (400) according to one embodiment of the present invention. FIG. 8 is a perspective view illustrating the shape in which a can (500) is received inside the induction heating device (400) according to one embodiment of the present invention. FIG. 9 is a plan view illustrating the concept of a can (500) being introduced into the induction heating device (400) according to one embodiment of the present invention.

[0065] Referring to FIGS. 6 to 9, an induction heating device (400) according to one embodiment of the present invention includes a bobbin (410), a working coil group (420), a lower plate (430), a roller (440), a shaft (450), a motor (460), a rotating plate (470), a bearing (480), a temperature sensor (490), and a scanner (495).

[0066] Below, the function of each component is explained in detail.

[0067] The bobbin (410) and the lower plate (430) function as a can receiving section for receiving cans.

[0068] The interior of the bobbin (410) has a hollow shape, and the interior shape of the bobbin (410) corresponds to the shape of the can (500). For example, since the can (500) generally has a cylindrical shape, the interior of the bobbin (410) may have a cylindrical shape. That is, the bobbin (410) has a hollow cylindrical shape. However, the shape of the bobbin (410) is not limited to the shape shown in FIGS. 6 to 9, and various shapes may be applied to the bobbin (410).

[0069] The upper surface of the bobbin (410) is open, and a can (500) can be inserted or withdrawn through the open upper surface.

[0070] The lower surface of the bobbin (410) can also be opened. This is because a rotating plate (470) is positioned at the bottom of the bobbin (410).

[0071] An incision (411) may be formed on the outer surface of the bobbin (410). The incision (411) may have the shape of a through hole. For example, the shape of the incision (411) may be square. However, the present invention is not limited thereto, and the incision (411) may have various shapes, such as a circular shape.

[0072] The number of incisions (411) may be multiple. Since the incisions (411) are formed in the bobbin (410) to bring the roller (440) into contact with the side of the can (500), the number of incisions (411) may be equal to the number of rollers (440).

[0073] A plurality of incisions (411) may include one or more first incisions (4111) and one or more second incisions (4112).

[0074] One or more first incisions (4111) are arranged in an up-and-down direction in a first portion of the outer surface of the bobbin (410). Each of the one or more first incisions (4111) is an incision for bringing one or more first rollers (441), described below, into contact with the side of the can (500).

[0075] One or more second incisions (4112) are arranged in an up-and-down direction in a second portion of the outer surface of the bobbin (410). Each of the one or more second incisions (4112) is an incision for bringing one or more second rollers (442), described below, into contact with the side of the can (500).

[0076] Meanwhile, the bobbin (410) can be fixedly installed in the internal space of the housing (200). That is, the bobbin (410) may not rotate.

[0077] The working coil (420) is wound on the outer surface of the bobbin (410). The working coil (420) heats the can (500) contained inside the bobbin (410).

[0078] Referring to FIGS. 6 to 9, the working coil (420) may be wound in a helical form on the outside of the outer surface of the bobbin (410). However, the present invention is not limited thereto, and the working coil (420) may be wound on the inside of the outer surface of the bobbin (410) or wound in a spiral form.

[0079] A working coil group (420) comprises one or more working coils (WC). One or more working coils (WC) are positioned on the outer surface of the bobbin (410). For example, one or more working coils (WC) may be wound on the outer surface of the bobbin (410). One or more working coils (WC) heat a can (500) housed inside the bobbin (410). One or more working coils (WC) may be electrically connected.

[0080] As an example, one or more working coils (WC) may include a first working coil (WC1) wound on the upper part of the bobbin (410), a second working coil (WC2) wound on the middle part of the bobbin (410), and a third working coil (WC3) wound on the lower part of the bobbin (410). However, the present invention is not limited thereto, and the number of one or more working coils (WC) may be one, two, or four or more. For convenience of explanation, it is assumed that the number of working coils (SC) is three.

[0081] According to one embodiment of the present invention, the first to third working coils (WC1, WC2, WC3) can be connected in parallel. That is, the first to third working coils (WC1, WC2, WC3) can receive driving power separately from each other.

[0082] Meanwhile, according to another embodiment of the present invention, the first to third working coils (WC1, WC2, WC3) may be connected in series. In this case, a single driving power may be supplied to all of the first to third working coils (WC1, WC2, WC3).

[0083] By using one or more working coils (WC), the problem of a portion of the received can (500) not being heated can be solved. That is, by using one or more working coils (WC), the can (500) can be heated more evenly.

[0084] One or more working coils (WC) can be positioned so as not to overlap with the incision (411). That is, one or more working coils (WC) can be positioned so as not to interfere with the plurality of incisions (411). Accordingly, the roller (440) can be prevented from coming into contact with the working coil (WC).

[0085] One or more working coils (WC) can be driven by driving power provided by the driving circuit unit (600). The circuit configuration of the driving circuit unit (600) is described in more detail below.

[0086] The lower plate (430) forms a can receiving section together with the bobbin (410). The lower plate (430) is positioned below the bobbin (410). The lower plate (430) performs the function of supporting the received can (500) at the bottom of the bobbin (410).

[0087] The lower plate (430) does not rotate and can be fixedly installed inside the housing (200).

[0088] In the plan view, the lower plate (430) may have a circular shape. However, the present invention is not limited thereto, and a lower plate (430) of various shapes, such as a rectangle, may be used.

[0089] A first hole (431) and a second hole (432) may be formed in the lower plate (430). As described below, the first hole (431) performs the function of passing a temperature sensing signal emitted from a temperature sensor (490), and the second hole (432) performs the function of passing a scan signal emitted from a scan unit (470). For example, the first hole (431) may be formed in the center of the lower plate (430), and the second hole (432) may be formed in the edge of the lower plate (430).

[0090] The roller (440) performs the function of rotating the can (500) received in the can receiving portion or supporting the received can (500). The roller (440) is located outside the bobbin (410) and can come into contact with the side of the received can (500) through the cut portion (411).

[0091] As mentioned above, there may be multiple rollers (440), and each of the multiple rollers (440) may come into contact with the side of the can (500) received through the multiple cut sections (411).

[0092] The roller (440) may include a first roller (441) and a second roller (442). That is, the plurality of rollers (440) may include one or more first rollers (441) and one or more second rollers (442).

[0093] The first roller (441) is a roller that rotates by the driving force of the motor (460) described below. The second roller (442) is a roller that does not rotate by the driving force of the motor (460) but supports the side of the received can (500). That is, the first roller (441) corresponds to a rotating roller, and the second roller (442) corresponds to a supporting roller.

[0094] The roller (440) can be installed on the shaft (450).

[0095] The shaft (450) is located outside the bobbin (410) and can be positioned along the length of the bobbin (410). The shaft (450) can be installed within the induction heating device (400) by passing through the center of the roller (440).

[0096] The shaft (450) may include a first shaft (451) and a second shaft (452).

[0097] The first shaft (451) is a shaft on which one or more first rollers (441) are installed. One or more first rollers (441) may be installed in parallel in the vertical direction on the first shaft (451). One or more first cuts (4111) are formed in the vertical direction on a first portion of the outer surface of the bobbin (410), and one or more first rollers (441) may be installed in the vertical direction on the first shaft (451) at positions corresponding to the positions of the one or more first cuts (4111).

[0098] The second shaft (452) is a shaft on which one or more second rollers (442) are installed. One or more second rollers (442) may be installed in parallel in the vertical direction on the second shaft (452). One or more second cutouts (4112) are formed in the vertical direction on the second portion of the outer surface of the bobbin (410), and one or more second rollers (442) may be installed in the vertical direction on the second shaft (452) at positions corresponding to the positions of the one or more second cutouts (4112).

[0099] FIGS. 6 to 8 illustrate the shape of an induction heating device (400) in which two first rollers (441) are installed on one first shaft (451) and four second rollers (442) are installed on two second shafts (452). However, the present invention is not limited thereto, and the number of first shafts (451) and second shafts (452) may be two or more.

[0100] According to one embodiment of the present invention, the shaft (450) can be moved in the radial direction of the bobbin (410). This is as illustrated in FIGS. 4, 6 and 9. As the position of the shaft (450) is movable, the roller (440) can be moved in the radial direction of the bobbin (410).

[0101] For example, the shaft (450) may be located at either a first position or a second position in the radial direction of the bobbin (410). The first position is a position of the shaft (450) such that the entire outer surface of the roller (440) is located outside the bobbin (410), and the second position is a position of the shaft (450) such that at least a portion of the outer surface of the roller (440) contacts the side of the can (500) contained in the bobbin (410). Accordingly, the distance between the center axis of the bobbin (410) and the first position may be greater than the distance between the center axis of the bobbin (410) and the second position.

[0102] Meanwhile, the present invention is not limited to the details described above. That is, either the first shaft (451) or the second shaft (452) may be movable in the radial direction of the bobbin (410). For example, the first shaft (451) may be movable in the radial direction of the bobbin (410), while the second shaft (452) may not be movable. For convenience of explanation, it is assumed below that both the first shaft (451) and the second shaft (452) are movable.

[0103] Hereinafter, with reference to FIG. 9, the concept of a can (500) being fed into and rotating in an induction heating device (400) will be explained in more detail.

[0104] FIG. 9(a) is a plan view showing the shape of the bobbin (410) before the can (500) is inserted into it. FIG. 9(b) is a plan view showing the shape of the bobbin (410) when the can (500) is inserted into it.

[0105] Referring to FIG. 9(b), the inner diameter (a) of the bobbin (410) is larger than the outer diameter (b) of the can (500). Also, referring to FIG. 9(a), when the can (500) is not inserted into the bobbin (410), the shaft (450) is positioned at a first position in the radial direction of the bobbin (410), and the entire outer surface of the roller (440) is positioned outside the bobbin (410). Thus, the can (500) can be easily inserted into the bobbin (410).

[0106] Additionally, when a can (500) is fed into the bobbin (410), the shaft (450) moves from a first position in the radial direction of the bobbin (410) to a second position, and at the second position, at least a portion of the outer surface of the roller (440) contacts the side of the received can (500). Thus, the received can (500) rotates due to the rotation of the first roller (441), and accordingly, the second roller (442) rotates. Furthermore, the received can (500) is fixed by the first roller (441) and the second roller (442) positioned at the second position so as not to come into contact with the inner surface of the bobbin (410), and no friction occurs between the received can (500) and the bobbin (410).

[0107] The motor (460) provides driving force. The motor (460) may be located outside the bobbin (410), for example, on the side of the bobbin (410).

[0108] The motor (460) may be connected to the first shaft (451), thereby allowing one or more first rollers (441) to be rotated. Additionally, the motor (460) may not be connected to the second shaft (452), thereby allowing one or more second rollers (442) not to be rotated by the motor (460).

[0109] More specifically, the drive shaft of the motor (460) is connected to one end of a drive force transmission device (465) (e.g., a pulley), and the other end of the drive force transmission device (465) is connected to a first shaft (451). The first shaft (451) and the drive shaft of the motor (460) can be indirectly connected through the drive force transmission device (465). Thus, the first shaft (451) can rotate by the driving force of the motor (460).

[0110] Meanwhile, although not illustrated in the drawings, according to another embodiment of the present invention, the drive shaft of the motor (460) may be directly connected to the first shaft (451).

[0111] One or more first rollers (441) are fixedly installed on the first shaft (451). Accordingly, one or more first rollers (441) can rotate based on the rotation of the first shaft (451), and the can (500) received by the rotating first rollers (441) can rotate.

[0112] Additionally, the motor (460) may not be connected to the second shaft (452). Therefore, the second shaft (452) may not rotate. Furthermore, one or more second rollers (442) may be installed so as to be rotatable rather than fixed to the second shaft (452). At this time, as the can (500) received by one or more first rollers (441) rotates, one or more second rollers (442) rotate. As one or more second rollers (442) rotate, friction with the rotating can (500) is minimized, and the can (500) is supported.

[0113] In summary, an induction heating device (400) according to one embodiment of the present invention can rotate a can (500) received in a can receiving portion based on the rotation of a first roller (441), which is one or more of the plurality of rollers (440), and the second roller (442), which is the remaining roller, rotates according to the rotation of the can (500). The first roller (441) supports the can (500) while rotating the can (500), and the second roller (442) performs only the function of supporting the can (500).

[0114] The rotating plate (470) is positioned between the bobbin (410) and the lower plate (430). The lower surface, i.e., the bottom surface, of the can (500) received is placed on the upper part of the rotating plate (470). The rotating plate (470) rotates based on the rotation of the received can (500) and simultaneously supports the bottom surface of the received can (500).

[0115] If the rotating plate (470) is not present, the bottom surface of the can (500) comes into direct contact with the upper surface of the lower plate (430). At this time, when the can (500) is rotated by the first roller (441), the bottom surface of the can (500) also rotates. Consequently, there is a problem of friction occurring between the bottom surface of the can (500) and the upper surface of the lower plate (430). The induction heating device (400) according to the present invention can reduce the aforementioned friction and make the rotation of the can (500) smoother by placing the rotating plate (470) between the bobbin (410) and the lower plate (430).

[0116] Referring to FIGS. 6 to 8, the rotating plate (470) may be ring-shaped. Accordingly, the central part of the rotating plate (470) is perforated. Also, in order to more stably support the bottom surface of the can (500), the upper surface of the rotating plate (470) may have a suitable width.

[0117] Meanwhile, when the lower part of the bobbin (410) and the upper surface of the rotating plate (470) come into contact with each other, friction may occur between the lower part of the bobbin (410) and the upper surface of the rotating plate (470) due to the rotation of the rotating plate (470). Therefore, the lower part of the bobbin (410) may be positioned at a certain distance from the upper surface of the rotating plate (470).

[0118] The bearing (480) is installed between the rotating plate (470) and the lower plate (430). The bearing (480) may be fixedly installed on the upper surface of the lower plate (430). Thus, the bearing (480) may not rotate.

[0119] The bearing (480) supports the rotation of the rotating plate (470) and further reduces friction. Referring to FIGS. 6 through 8, the bearing (480) may be ring-shaped. Accordingly, the central part of the bearing (480) is through.

[0120] In summary, a can heating device (100) according to one embodiment of the present invention forms a working coil (420) wound on the outer surface of a bobbin (410) in which a can (500) is received, and also forms an incision (411) into which a roller (440) can be inserted. Accordingly, the structure of the can heating device (100), which simultaneously performs heating and rotation of the can (500), can be made simple and slim.

[0121] Additionally, by rotating the can (500) received in the can receiving portion through the roller (440), internal flow of the contents of the can (500) is generated. Accordingly, heat transfer of the contents of the can (500) is increased, and the temperature of the contents of the can (500) can be rapidly increased.

[0122] In addition, the temperature of the can (500) can be increased more rapidly by winding a working coil (420) on the outer surface of the bobbin (410). That is, in conventional technologies, there is a certain gap between the heating coil and the can, but in the can heating device (100) according to the present invention, the working coil (420) is attached to the bobbin (410) in which the can (500) is accommodated. Therefore, the gap between the can (500) and the working coil (420) can be reduced, wasted power can be reduced, and the temperature of the can (500) can be increased more rapidly.

[0123] In addition, a can heating device (100) according to one embodiment of the present invention can rotate the can (500) while stably fixing the can (500) by bringing a roller (440) positioned outside the bobbin (410) into contact with the can (500) housed inside the bobbin (410). At this time, since the position of the roller (440) can be changed, the insertion and withdrawal of the can (500) into and out of the bobbin (410) can be made easier.

[0124] Again, referring to FIGS. 6 through 8, a temperature sensor (490) is positioned at the bottom of a lower plate (430) and radiates a temperature sensing signal to the bottom surface of a received can (500). Here, the temperature sensor (490) may be a non-contact infrared temperature sensor.

[0125] In particular, the temperature sensor (490) may be positioned below the first hole (431) formed in the center of the lower plate (430). The temperature sensor (490) may radiate a temperature sensing signal to the upper part of the lower plate (430) through the first hole (431). The radiated temperature sensing signal is received by the bottom surface of the can (500) received through the perforated center of the rotating plate (470) and the perforated center of the bearing (480). Accordingly, the temperature of the bottom surface of the can (500) can be detected. The detected temperature can be used to control the output of the working coil (420) and to control the rotation of the first roller (441).

[0126] An induction heating device (400) according to one embodiment of the present invention can accurately measure the temperature by measuring the temperature of the bottom surface of a can (500).

[0127] More specifically, the side of the container of the can (500) is coated with a specific material and color to distinguish it from other cans. However, the material of the container of the can (500) is different from the material of the coating material. Therefore, when measuring the temperature from the side of the can (500), the temperature of the container of the can (500) and the temperature of the contents inside the can (500) cannot be measured accurately. In particular, if the color of the coating material is a color with high reflectivity, the temperature of the container of the can (500) and the contents cannot be measured even more accurately.

[0128] However, the bottom surface of the can (500) is generally not painted and has the material and color of the container as is. Accordingly, the induction heating device (400) according to one embodiment of the present invention can accurately measure the temperature of the bottom surface of the can (500) by placing a temperature sensor (490) on the lower part of the lower plate (430).

[0129] The scanning unit (495) is positioned at the bottom of the lower plate (430) and emits a scan signal to the bottom surface of the received can (500).

[0130] The scan unit (495) can be positioned below the second hole formed at the edge of the lower plate (430). The scan unit (495) can radiate a scan signal to the upper part of the lower plate (430) through the second hole.

[0131] An information code may be attached to the bottom surface of the can (500), and the scanning unit (495) performs the function of identifying the information code. For example, the information code may be a barcode or a QR code.

[0132] The information code contains various information related to the can (500). For example, the information code may include information such as the type of contents of the can (500), the weight of the contents, the material of the container of the can (500), and the capacity of the container of the can (500). In particular, the information code may include information related to the target temperature of the can (500).

[0133] The scanning unit (495) can scan an information code and transmit the scanned information to the control unit. The control unit can identify various information using the transmitted information and control the output of the working coil (WC) based on the identified information. That is, the control unit can control the operation of the driving circuit unit (600) based on the identified information to control the output of the working coil (WC).

[0134] Meanwhile, the placement location of the scanning unit (495) is not limited to the details described above, and the scanning unit (495) may be placed at various locations. That is, if the information code is attached to a part other than the bottom surface of the can (500), the scanning unit (495) may be placed at a part of the induction heating device (400) corresponding to the part of the can (500) to which the information code is attached.

[0135] Additionally, the scanning unit (495) may be omitted from the induction heating device (400). In this case, the information included in the information code may be stored in advance in the memory within the control unit. Alternatively, the user may input the information through the input unit included in the induction heating device (400).

[0136] Hereinafter, a driving circuit unit (600) according to one embodiment of the present invention will be described in detail with reference to FIG. 10.

[0137] FIG. 10 is a circuit diagram illustrating the schematic structure of a driving circuit section (600) according to one embodiment of the present invention.

[0138] Referring to FIG. 10, the driving circuit section (600) includes a power supply section (610), a rectifier section (620), a DC link capacitor (630), an inverter (640), a plurality of resonant capacitor groups (650), and an inverter control section (660).

[0139] Each driving circuit (600) can be connected to a plurality, that is, N (a natural number greater than or equal to 2) working coil groups (420).

[0140] As previously mentioned, a working coil group (WCG) comprises one or more electrically connected working coils (WC). For convenience of explanation, in FIG. 10, one or more working coils (WC) (i.e., a working coil group (WCG)) are represented as a single component. Also, for convenience of explanation, in FIG. 10, three working coil groups (WCG1, WCG2, WCG3) are represented as being connected to a driving circuit (600). Furthermore, the terms working coil group (420) and working coil group (WCG) are to be used interchangeably.

[0141] Meanwhile, the driving circuit (600) can be implemented in various variations within the range of heating N working coil groups (WCG), but for convenience of explanation in the embodiment of the present invention, the components shown in FIG. 10 will be used as examples.

[0142] The power supply unit (610) outputs alternating current power. Specifically, the power supply unit (610) outputs alternating current power and provides it to the rectifier unit (620). The alternating current power may be commercial alternating current power.

[0143] The rectifier (620) rectifies the AC power supplied from the power supply (610) and converts it into DC power. As an example, the rectifier (620) may have a structure in which four diodes are connected in a full bridge configuration.

[0144] The DC power rectified by the rectifier (620) is supplied to a DC link capacitor (i.e., a smoothing capacitor) (630), and the DC link capacitor (630) can reduce the ripple of the DC power.

[0145] For reference, the DC link capacitor (630) can be connected in parallel between the rectifier (620) and the inverter (640). Additionally, a voltage from DC power is applied to one end of the DC link capacitor (630), and the other end of the DC link capacitor (630) can be connected to ground.

[0146] Additionally, although not shown in FIG. 10, the DC power rectified by the rectifier (620) can be supplied to a filter (not shown) rather than a DC link capacitor (630), and the filter can remove the AC component remaining in the DC power.

[0147] However, in the can heating device (100) according to one embodiment of the present invention, the DC power rectified by the rectifier (620) is provided to the DC link capacitor (630) as an example.

[0148] The DC power rectified by the rectifier (620) and the DC link capacitor (630) is supplied to the inverter (640).

[0149] The inverter (640) is connected to N working coil groups (WCG) and performs a switching operation to apply resonant current to the N working coil groups (WCG). That is, one inverter (640) exists within the driving circuit section (600), and one inverter (640) provides driving power to the N working coil groups (WCG).

[0150] Specifically, the inverter (640) can perform switching operations by receiving DC power from the rectifier (620). That is, the inverter (640) can receive DC power that is rectified by the rectifier (620) and has ripple reduced by the DC link capacitor (630). Meanwhile, the inverter (640) may be an inverter having a driving frequency of 100 kHz or higher using a wide band gap (WBG) power element.

[0151] The inverter (640) may include a plurality, that is, N+1 switching elements (S). Each of the N+1 switching elements (S) may include a transistor, and the transistor may be an IGBT (insulated gate bipolar mode transistor).

[0152] For example, as illustrated in FIG. 10, when the can heating device (100) includes three working coil groups (WCG1, WCG2, WCG3), the inverter (640) may include four switching elements (S1, S2, S3, S4).

[0153] N+1 switching elements (S) can be connected in series with each other. For example, when the number of switching elements (S) is 4, the other end of the first switching element (S1) is connected to one end of the second switching element (S2), the other end of the second switching element (S2) is connected to one end of the third switching element (S3), and the other end of the third switching element (S3) is connected to one end of the fourth switching element (S4). One end of the first switching element (S1) is connected to one end of the rectifier (620) and one end of the DC link capacitor (630), and the other end of the first switching element (S4) is connected to the other end of the rectifier (620) and the other end of the DC link capacitor (630).

[0154] Each of the N resonant capacitor groups (650) may be composed of two resonant capacitors (Cr). That is, each of the N resonant capacitor groups (650) may be composed of a first resonant capacitor (Cr1) and a second resonant capacitor (Cr2). At this time, the other end of the first resonant capacitor (Cr1) may be connected to one end of the second resonant capacitor (Cr2), one end of the first resonant capacitor (Cr1) may be connected to one end of the rectifier (620), and the other end of the second resonant capacitor (Cr2) may be connected to the other end of the rectifier (620).

[0155] Meanwhile, one end of the i-th working coil group (WCG) (a natural number greater than or equal to 1 and less than or equal to N) among the N working coil groups (WCG) can be connected between the i-th switching element (Si) and the i+1-th switching element (Si+1) among the N+1 switching elements (S). Also, the other end of the i-th working coil group (WCG) can be connected between the first resonant capacitor (Cr1) and the second resonant capacitor (Cr2) included in the i-th resonant capacitor group (650) among the N resonant capacitor groups (650).

[0156] For example, referring to FIG. 10, one end of the first working coil group (WCG1) is connected between the first switching element (S1) and the second switching element (S2), and the other end of the first working coil group (WCG1) is connected between the first-1 resonant capacitor (Cr11) and the first-2 resonant capacitor (Cr12) included in the first resonant capacitor group (650). Then, one end of the second working coil group (WCG2) is connected between the second switching element (S2) and the third switching element (S3), and the other end of the second working coil group (WCG2) is connected between the second-1 resonant capacitor (Cr21) and the second-2 resonant capacitor (Cr22) included in the second resonant capacitor group (650). Additionally, one end of the third working coil group (WCG3) is connected between the third switching element (S3) and the fourth switching element (S4), and the other end of the third working coil group (WCG3) is connected between the third-1 resonant capacitor (Cr31) and the third-2 resonant capacitor (Cr32) included in the third resonant capacitor group (650).

[0157] The resonant capacitor group (650) can form a resonant circuit together with the working coil group (WCG).

[0158] Each of the N+1 switching elements (S) receives a switching control signal from the inverter control unit (660) and can perform a switching operation based on the provided switching control signal.

[0159] The inverter control unit (660) generates a switching control signal to control the switching operation of the inverter (640) and provides the generated switching control signal to the inverter (640). When each of the plurality of switching elements (S) corresponds to a transistor, the switching control signal may be provided to the control electrode of each of the plurality of switching elements (S).

[0160] For example, the inverter control unit (650) generates a PWM control signal and provides it to the inverter (640), and the inverter (640) can perform a switching operation based on the PWM control signal.

[0161] According to one embodiment of the present invention, the switching control signal generated in the inverter (640) may include a first pulse signal, a second pulse signal, and a high level signal.

[0162] FIG. 11 is a diagram illustrating the concept of a switching control signal according to the present invention.

[0163] The first pulse signal and the second pulse signal are signals in which a high level and a low level are repeated sequentially. At this time, the phases of the first pulse signal and the second pulse signal are opposite to each other. That is, at a specific point in time, the first pulse signal has a level of either the high level or the low level, and the second pulse signal has a level different from either the high level or the low level. The high level signal is a signal in which the high level is continuously maintained.

[0164] An inverter control unit (660) according to one embodiment of the present invention may be controlled by the control unit mentioned above. Additionally, the inverter control unit (660) may control the inverter (640) so that heating of the can (500) is completed within a target time. At this time, the inverter control unit (660) may determine a switching control signal based on the detected temperature value detected by the temperature sensor (490) and the target temperature value corresponding to the can (500).

[0165] Hereinafter, the can heating operation of the present invention will be explained with reference to FIG. 12, focusing on an embodiment of a driving circuit unit (600) in which the induction heating device (400) and the working coil group (WCG) are three and the number of switching elements (S) included in the inverter (640) is four.

[0167] 1. Case A where only the first working coil group (WCG1) is driven

[0168] Case A is a case in which a can (500) is received in the first induction heating device (400), and a can (500) is not received in the second and third induction heating devices (400).

[0169] In this case, a first pulse signal may be provided to the first switching element (S1), and a second pulse signal may be provided to each of the second to fourth switching elements (S2, S3, S4). This is as illustrated in FIG. 12 (a).

[0170] Accordingly, the first working coil group (WCG1) is driven, the second and third working coil groups (WCG2, WCG3) are not driven, and only the can (500) contained in the first induction heating device (400) can be heated within the target time.

[0172] 2. Case B where only the second working coil group (WCG2) is driven

[0173] Case B is a case in which a can (500) is received in the second induction heating device (400), and a can (500) is not received in the first and third induction heating devices (400).

[0174] In this case, a first pulse signal may be provided to each of the first and second switching elements (S1, S2), and a second pulse signal may be provided to each of the third and fourth switching elements (S3, S4). This is as illustrated in FIG. 12 (b).

[0175] Accordingly, the second working coil group (WCG2) is driven, the first and third working coil groups (WCG1, WCG3) are not driven, and only the can (500) contained in the second induction heating device (400) can be heated within the target time.

[0177] 3. Case C where only the 3rd Working Coil Group (WCG3) is driven

[0178] Case C is a case in which a can (500) is received in the third induction heating device (400), and a can (500) is not received in the first and third induction heating devices (400).

[0179] In this case, a first pulse signal may be provided to each of the first to third switching elements (S1, S2, S3), and a second pulse signal may be provided to the fourth switching element (S4). This is as illustrated in (c) of FIG. 12.

[0180] Accordingly, the third working coil group (WCG3) is driven, the first and second working coil groups (WCG1, WCG2) are not driven, and only the can (500) contained in the third induction heating device (400) can be heated within the target time.

[0182] 4. Case D in which the first and second working coil groups (WCG1, WCG2) are driven

[0183] Case D is a case in which a can (500) is received in the first and second induction heating devices (400), and a can (500) is not received in the third induction heating device (400).

[0184] In this case, a first pulse signal may be provided to the first switching element (S1), a high-level signal may be provided to the second switching element (S2), and a second pulse signal may be provided to each of the third and fourth switching elements (S3, S4). This is as illustrated in (d) of FIG. 12.

[0185] Accordingly, the first and second working coil groups (WCG1, WCG2) are driven simultaneously, the third working coil group (WCG1, WCG2) is not driven, and the can (500) contained in the first and second induction heating devices (400) can be heated within the target time.

[0187] 5. Case E in which the second and third working coil groups (WCG2, WCG3) are driven

[0188] Case E is a case in which a can (500) is received in the second and third induction heating devices (400), and a can (500) is not received in the first induction heating device (400).

[0189] In this case, a first pulse signal may be provided to each of the first and second switching elements (S1, S2), a high level signal may be provided to the third switching element (S3), and a second pulse signal may be provided to the fourth switching element (S4). This is as illustrated in (e) of FIG. 12.

[0190] Accordingly, the second and third working coil groups (WCG2, WCG3) are driven simultaneously, the first working coil group (WCG1) is not driven, and the can (500) contained in the second and third induction heating devices (400) can be heated within the target time.

[0192] 6. Case F in which the first to third working coil groups (WCG1, WCG2, WCG3) are driven

[0193] Case F is a case in which a can (500) is accommodated in all of the first to third induction heating devices (400).

[0194] In this case, a first pulse signal may be provided to the first switching element (S1), a high level signal may be provided to each of the second and third switching elements (S2, S3), and a second pulse signal may be provided to the fourth switching element (S4). This is as illustrated in (f) of FIG. 12.

[0195] Accordingly, the first to third working coil groups (WCG1, WCG2, WCG3) are driven simultaneously, and the can (500) contained in the first and third induction heating devices (400) can be heated within a target time.

[0196] Although not described above, the first and third working coil groups (WCG1, WCG3) may not be driven simultaneously. In this case, the first and third working coil groups (WCG1, WCG3) may be driven via a time-sharing method.

[0197] Meanwhile, according to one embodiment of the present invention, the target time value corresponding to the received can (500) may be the same. That is, the can heating device (100) according to one embodiment of the present invention can complete the heating of the received can (300) at the same time.

[0198] At this time, when heating multiple cans (500) simultaneously, the duty ratio of the switching control signal of the inverter control unit (660) can be adjusted to control the output value of each of the multiple working coil groups (WCG).

[0199] That is, the capacity of the contents of the multiple cans (500), the materials of the containers, the target temperature, etc., may differ from one another for each of the multiple cans (500). Accordingly, the inverter control unit (660) can complete the heating of the multiple cans (500) at the same time by controlling the duty ratio of the switching control signal.

[0200] In summary, a can heating device (100) according to one embodiment of the present invention can provide driving power to a plurality of working coil groups (420) using a single inverter. Through this, the structure of the driving circuit unit (600) can be simplified, the complexity and size of the structure of the can heating device (100) can be reduced, and the manufacturing cost of the can heating device (100) can be reduced.

[0201] In particular, a can heating device (100) according to one embodiment of the present invention can heat a plurality of cans (500) simultaneously by efficiently setting the connection relationship between a plurality of switching elements (S) and a plurality of working coil groups (WCG) within a driving circuit unit (600).

[0202] In addition, a can heating device (100) according to one embodiment of the present invention can use a single inverter to terminate the heating of a plurality of cans (500) within a target time defined for each can (500). In particular, a can heating device (100) according to one embodiment of the present invention can terminate the heating of a plurality of cans (500) at the same completion time. Accordingly, convenience for the manager in managing cans can be achieved.

[0203] In addition, a can heating device (100) according to one embodiment of the present invention forms a working coil group (420) wound on the outer surface of a bobbin (410) in which a can (500) is received, and forms an incision (411) into which a roller (440) can be inserted. Accordingly, the structure of the can heating device (100), which simultaneously performs heating and rotation of the can (500), can be made simple and slim.

[0204] In addition, a can heating device (100) according to one embodiment of the present invention generates internal flow of the contents of a can (500) by rotating a can (500) received in a can receiving portion through a roller (440). Accordingly, heat transfer of the contents of the can (500) is increased, and the temperature of the contents of the can (500) can be rapidly increased.

[0205] In addition, a can heating device (100) according to one embodiment of the present invention can increase the temperature of a can (500) more rapidly by winding a working coil (420) on the outer surface of a bobbin (410).

[0206] Hereinafter, with reference to FIG. 13, the flow of the heating operation of the can (500) will be explained in more detail.

[0207] FIG. 13 is a flowchart of a control method for a can heating device (100) according to one embodiment of the present invention.

[0208] The steps illustrated in FIG. 13 are steps in which one induction heating device (400) heats a can. FIG. 13 is applicable to all induction heating devices (400) included in the can heating device (400).

[0209] Also, each step of FIG. 13 can be performed with the control unit at the center, and the concept of rotation of the can (500) is omitted for convenience of explanation.

[0210] The process performed at each stage is explained in detail below.

[0211] In step (S1305), the control unit determines whether the can (500) is received into the interior of the bobbin (410).

[0212] According to one embodiment of the present invention, the control unit can determine whether to accept the can (500) by using at least one of a cover opening signal transmitted from the cover (300) and the degree of attenuation of the resonant current flowing through the working coil group (420).

[0213] If the can (500) is not accepted, in step (S1310), the control unit may output a message indicating that the can (500) is not available through the output unit.

[0214] When the can (500) is received, in step (S1315), the control unit turns on the temperature sensor (490) and the scan unit (495). Thus, the temperature of the can (500) is detected, and the information code attached to the can (500) is scanned.

[0215] As previously mentioned, the information code may include at least one piece of information related to the type of contents of the can (500), the weight of the contents, the material of the container of the can (500), the capacity of the container of the can (500), and the target temperature of the can (500). The control unit may receive the at least one piece of information.

[0216] In step (S1320), the control unit sets the output value of the working coil group (420).

[0217] Since the target heating time of the can (500) is pre-set, in step (S1320), the output value of the working coil group (420) corresponding to the target heating time is set.

[0218] According to one embodiment of the present invention, the control unit can set the output value of the working coil group (420) based on the detected temperature and at least one received information.

[0219] As an example, the control unit can set the output value of the working coil group (420) based on the following mathematical formula 1.

[0221]

[0223] Here, Q is the output value, T1 is the detected temperature, T2 is the target temperature, and W W is the weight of the contents of the can (500), W g represents the weight of the container of the can (500), and CP represents the specific heat of the container of the can (500).

[0224] At this time, the target temperature may be included in at least one of the received information, or the user may input it through the input unit.

[0225] In step (S1325), the control unit turns on the working coil group (420). That is, the control unit controls the driving circuit unit (600) to turn on the working coil group (420). Accordingly, the can (500) is heated.

[0226] In step (S1330), the control unit determines whether the detected temperature has reached the target temperature.

[0227] If the detected temperature does not reach the target temperature, in step (S1335), the control unit controls the driving circuit unit (600) to maintain the heating of the can (500).

[0228] When the detected temperature reaches the target temperature, in step (S1340), the control unit controls the driving circuit unit (600) to keep the can (500) warm.

[0229] In step (S1345), the control unit determines whether the can (500) has been removed from the bobbin (410). This operates similarly to step (S1305).

[0230] If the can (500) does not detach, step (S1340) is performed.

[0231] When the can (500) is disengaged, in step (S1350), the control unit turns off the working coil group (420). That is, the control unit controls the driving circuit unit (600) to turn off the working coil group (420).

[0232] In short, a can heating device (100) according to one embodiment of the present invention can complete the heating of a plurality of cans (500) within a target time defined for each can (500) by comparing the detected temperature value and the target temperature value of each of the plurality of cans (500).

[0233] In particular, a can heating device (100) according to one embodiment of the present invention can use a single inverter (640) to terminate the heating of a plurality of cans (500) at the same time. Accordingly, convenience for the manager in managing cans can be achieved.

[0234] In addition, a can heating device according to one embodiment of the present invention can easily set the output value of a working coil group by reading an information code attached to a can. Accordingly, the heating of the can (500) can be controlled in a simple manner.

[0235] As described above, the present invention has been explained by specific details such as specific components, limited embodiments, and drawings; however, this is provided merely to aid in the overall understanding of the invention, and the invention is not limited to the above embodiments. A person skilled in the art to which the invention pertains can make various modifications and variations from this description. Therefore, the scope of the invention should not be limited to the described embodiments, and all things equivalent to or having equivalent variations to the claims set forth below, as well as the claims themselves, shall be considered to fall within the scope of the concept of the invention. Explanation of the symbols

[0237] 100: Can heating device 200: Housing 300: Cover 400, 1400: Induction heating device 410, 1410: Bobbin 411, 1411: 1st Sub Bobbin 412, 1412: 2nd sub-bobbin 420, 1420: Working coil group 430, 1430: Lower plate 440, 1435: Elastic element 450: Gap spacer 460, 1490: Temperature sensor 500: Can 600: Driving circuit section 610: Power supply unit 620: Rectifier unit 630: DC link capacitor 640: Inverter 650: Resonant capacitor 660: Inverter control unit 670: Third switching element 680: Switching control unit 1413: Incision 1440: Roller 1441: 1st roller 1442: 2nd roller 1450: Shaft 1451: First shaft 1452: Second shaft 1460: Motor 1465: Driving force transmission device 1470: Rotating plate 1480: Bearing

Claims

Claim 1 N (a natural number greater than or equal to 2) can receiving sections; N groups of working coils arranged adjacent to each of the N can receiving sections; N temperature sensors for detecting the temperature of each of the N cans; and a driving circuit unit for driving each of the N working coil groups; wherein the driving circuit unit comprises an inverter composed of N+1 switching elements connected in series to provide driving power to each of the N working coil groups, and an inverter control unit for controlling the driving of the N+1 switching elements, wherein the inverter control unit applies a switching control signal to the N+1 switching elements to ensure that heating is completed within a target time by comparing the detected temperature value of the temperature sensor with a target temperature value, and the output value of each of the N working coil groups is controlled by the switching control signal, and one end of the i-th (a natural number greater than or equal to 1 and less than or equal to N) working coil group among the N working coil groups is connected between the i-th and i+1-th switching elements among the N+1 switching elements, and the inverter control unit applies one of a high level signal, a first pulse signal, and a second pulse signal individually to the N+1 switching elements depending on whether a can is received in each of the N can receiving units, wherein the second pulse signal has an opposite phase to the first pulse signal, and the high level signal maintains a high level continuously. Signal, can heating device. Claim 2 delete Claim 3 delete Claim 4 A can heating device according to claim 1, wherein the driving circuit further comprises N groups of resonant capacitors, each of the N groups of resonant capacitors comprises a first and second resonant capacitor connected in series, and the other end of the i-th working coil group is connected between the first and second resonant capacitors included in the i-th group of resonant capacitors among the N groups of resonant capacitors. Claim 5 delete Claim 6 A can heating device according to claim 4, wherein the driving circuit further includes a rectifier that converts AC power into DC power, wherein one end of the rectifier is connected to one end of a first resonant capacitor included in each of the N capacitor groups and one end of a first switching element among the N working coil groups, and the other end of the rectifier is connected to the other end of a second resonant capacitor included in each of the N capacitor groups and the other end of a Nth switching element among the N working coil groups. Claim 7 A can heating device according to claim 4, wherein the N can receiving portions include first, second, and third can receiving portions, the N+1 switching elements include first, second, third, and fourth switching elements, the N working coil groups include first, second, and third working coil groups, and the N resonant capacitor groups include first, second, and third resonant capacitor groups. Claim 8 A can heating device according to claim 7, wherein when the can is received in the first can receiving portion and the can is not received in the second and third can receiving portions, the first pulse signal is applied to the first switching element and the second pulse signal is applied to the second to fourth switching elements, so that the first working coil group is driven and the second and third working coil groups are not driven. Claim 9 A can heating device according to claim 7, wherein when the can is received in the second can receiving portion and the can is not received in the first and third can receiving portions, the first pulse signal is applied to the first and second switching elements and the second pulse signal is applied to the third and fourth switching elements, so that the second working coil group is driven and the first and third working coil groups are not driven. Claim 10 A can heating device according to claim 7, wherein when the can is received in the third can receiving portion and the can is not received in the first and second can receiving portions, the first pulse signal is applied to the first to third switching elements and the second pulse signal is applied to the fourth switching element, so that the third working coil group is driven and the first and second working coil groups are not driven. Claim 11 A can heating device according to claim 7, wherein when the can is received in the first and second can receiving portions and the can is not received in the third can receiving portion, the first pulse signal is applied to the first switching element, the high level signal is applied to the second switching element, and the second pulse signal is applied to the third and fourth switching elements, so that the first and second working coil groups are driven and the third working coil group is not driven. Claim 12 A can heating device according to claim 7, wherein when the can is received in the second and third can receiving portions and the can is not received in the first can receiving portion, the first pulse signal is applied to the first and second switching elements, the high level signal is applied to the third switching element, and the second pulse signal is applied to the fourth switching element, so that the second and third working coil groups are driven and the first working coil group is not driven. Claim 13 A can heating device according to claim 7, wherein when the can is received in the first, second, and third can receiving portions, the first pulse signal is applied to the first switching element, the high level signal is applied to the second and third switching elements, and the second pulse signal is applied to the fourth switching element, thereby driving the first, second, and third working coil groups. Claim 14 A can heating device according to claim 1, further comprising: a scanning unit for scanning an information code attached to the can; wherein the information stored in the information code includes at least one of information related to the target temperature of the can, information on the type of contents of the can, information on the weight of the contents of the can, information on the material of the container of the can, and information on the weight of the container of the can, and the inverter control unit controls the duty ratio of the switching control signal to adjust the output value of the N working coil groups based on the at least one of the information. Claim 15 A can heating device according to claim 1, wherein the can receiving portion comprises: a bobbin having a plurality of cuts formed on its outer surface; and a plurality of rollers capable of contacting the side of the received can through the plurality of cuts, wherein the received can rotates based on the rotation of one or more of the plurality of rollers. Claim 16 A can heating device according to claim 15, wherein the can receiving portion further comprises: a lower plate positioned at the bottom of the bobbin and supporting the received can; a rotating plate positioned between the bobbin and the lower plate and rotating by the rotation of the received can; and a motor positioned outside the bobbin and providing driving force, wherein the plurality of rollers comprises one or more first rollers that rotate by the driving force of the motor and one or more second rollers that do not rotate by the driving force of the motor and support the side of the received can. Claim 17 delete

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