Home appliance including inductor employing bias magnet

Abstract

According to one embodiment of the present disclosure, disclosed is a home appliance comprising a core to which a bias magnet is applied. The core of the home appliance comprises: a core including an air gap in a first leg; a coil wound around at least a part of the core so that a magnetic flux flows in the first leg; an upper magnet arranged above the air gap in the first leg; and a lower magnet arranged below the air gap in the first leg. In this case, the magnetic flux direction of the coil and the magnetic flux direction of the upper magnet and the lower magnet may be opposite to each other.

Description

Home appliances containing inductors employing bias magnets

[0001] The present disclosure relates to a home appliance including an inductor employing a bias magnet.

[0002] Home appliances often contain DC inductors, which allow current to flow in only one direction. DC inductors are widely used in PFC circuits. Ferrite cores are often used as cores for DC inductors. While ferrite cores offer the advantages of low cost and low magnetic loss at high frequencies, they are prone to magnetic saturation. Saturation significantly reduces inductance. Therefore, DC inductors containing ferrite cores are not suitable for high-current applications, such as PFC circuits in home appliances.

[0003] According to one embodiment of the present disclosure, a home appliance including an inductor including a bias magnet is disclosed. According to one embodiment, the home appliance may include a rectifier circuit for rectifying an AC voltage of an input power source, a power circuit for improving a power factor of a voltage rectified by the rectifier circuit, and a link capacitor connected to the power circuit and smoothing a DC voltage. According to one embodiment, the power circuit of the home appliance may include a PFC circuit, and the power circuit may include an inductor. According to one embodiment, the home appliance may include an SMPS including an inductor instead of the PFC circuit. According to one embodiment, the home appliance may include a power conversion device including an inductor instead of the PFC circuit.

[0004] According to one embodiment of the present disclosure, a home appliance including an inductor including a bias magnet is disclosed. In one embodiment, the home appliance may include a rectifier circuit for rectifying an AC voltage of an input power source, a PFC circuit for improving a power factor of the voltage rectified by the rectifier circuit, and a link capacitor connected to the PFC circuit for smoothing a DC voltage. In one embodiment, the home appliance may include a PFC circuit, and the PFC circuit may include an inductor. In one embodiment, the home appliance may include an SMPS including an inductor instead of the PFC circuit. In one embodiment, the home appliance may include a power conversion device including an inductor instead of the PFC circuit.

[0005] In one embodiment, an inductor included in a PFC circuit, an SMPS, and / or a power converter may include a core including an air gap in a first group. In one embodiment, the inductor may include a coil wound around at least a portion of the core such that magnetic flux flows in the first group. In one embodiment, the inductor may include an upper magnet disposed above the air gap in the first group. In one embodiment, the inductor may include a lower magnet disposed below the air gap in the first group. In one embodiment, in the inductor, a direction of magnetic flux by the coil and directions of magnetic flux by the upper magnet and the lower magnet are opposite to each other. In one embodiment, the inductor may include only one of the upper magnet or the lower magnet when the upper magnet or the lower magnet includes an electromagnet coil having a coil wound thereon.

[0006] FIG. 1A is a circuit diagram of a power conversion device using an inductor according to one embodiment of the present disclosure.

[0007] FIG. 1b is a circuit diagram of a power conversion device using an inductor according to one embodiment of the present disclosure.

[0008] FIG. 1c is a circuit diagram of a power conversion device using an inductor according to one embodiment of the present disclosure.

[0009] Figure 2 shows a BH curve representing the characteristics of an inductor.

[0010] FIG. 3 is a drawing showing moving the BH curve to the right according to one embodiment of the present disclosure.

[0011] FIG. 4 is a drawing showing a BH curve shifted to the right by applying a bias magnet according to one embodiment of the present disclosure.

[0012] FIG. 5 is a drawing showing a bias core in which a bias magnet is placed in an air gap of the core according to one embodiment of the present disclosure.

[0013] Figure 6 is a drawing showing that fringing flux occurs in a square core.

[0014] FIG. 7 is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0015] FIG. 8a is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0016] FIG. 8b is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0017] FIG. 8c is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0018] FIG. 8d is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0019] FIG. 9a is a core structure in which a bias magnet is formed on a side group according to one embodiment of the present disclosure.

[0020] FIG. 9b is a core structure in which a bias magnet is formed on a side group according to one embodiment of the present disclosure.

[0021] FIG. 9c is a core structure in which a bias magnet is formed on a side group according to one embodiment of the present disclosure.

[0022] FIG. 9d is a core structure in which a bias magnet is formed on a side group according to one embodiment of the present disclosure.

[0023] FIG. 10A illustrates a structure in which a bias magnet is attached to a square-shaped core according to one embodiment of the present disclosure.

[0024] FIG. 10b illustrates a structure in which a bias magnet is attached to a square-shaped core according to one embodiment of the present disclosure.

[0025] FIG. 10c illustrates a structure in which a bias magnet is attached to a square-shaped core according to one embodiment of the present disclosure.

[0026] FIG. 10d illustrates a structure in which a bias magnet is attached to a square-shaped core according to one embodiment of the present disclosure.

[0027] FIG. 11a is a core structure with a bias magnet attached by a coil according to one embodiment of the present disclosure.

[0028] FIG. 11b is a core structure with a bias magnet attached by a coil according to one embodiment of the present disclosure.

[0029] FIG. 11c is a core structure with a bias magnet attached by a coil according to one embodiment of the present disclosure.

[0030] FIG. 12a is a core structure with a bias magnet attached by a coil according to one embodiment of the present disclosure.

[0031] FIG. 12b is a core structure with a bias magnet attached by a coil according to one embodiment of the present disclosure.

[0032] FIG. 13a is a core structure with a bias magnet attached by a coil according to one embodiment of the present disclosure.

[0033] FIG. 13b is a core structure with a bias magnet attached by a coil according to one embodiment of the present disclosure.

[0034] FIG. 14a is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0035] FIG. 14b is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0036] FIG. 15A is a cross-sectional view of a bias magnet according to one embodiment of the present disclosure.

[0037] FIG. 15b is a cross-sectional view of a bias magnet according to one embodiment of the present disclosure.

[0038] FIG. 15c is a cross-sectional view of a bias magnet according to one embodiment of the present disclosure.

[0039] FIG. 15d is a cross-sectional view of a bias magnet according to one embodiment of the present disclosure.

[0040] FIG. 15e is a cross-sectional view of a bias magnet according to one embodiment of the present disclosure.

[0041] FIG. 15f is a perspective view of a bias magnet according to one embodiment of the present disclosure.

[0042] FIG. 16 is a drawing showing a bobbin structure according to one embodiment of the present disclosure.

[0043] FIG. 17a is a diagram showing a change in magnetic flux according to a change in coil current when a bias magnet is installed in the core midfoot according to one embodiment of the present disclosure.

[0044] FIG. 17b is a diagram showing a change in magnetic flux according to a change in coil current when a bias magnet is installed in the core midfoot according to one embodiment of the present disclosure.

[0045] FIG. 17c is a diagram showing a change in magnetic flux according to a change in coil current when a bias magnet is installed in the core midfoot according to one embodiment of the present disclosure.

[0046] FIG. 17d is a diagram showing a change in magnetic flux according to a change in coil current when a bias magnet is installed in the core midfoot according to one embodiment of the present disclosure.

[0047] FIG. 17e is a diagram showing a change in magnetic flux according to a change in coil current when a bias magnet is installed in a core mid-section according to one embodiment of the present disclosure.

[0048] FIG. 17e is a diagram showing a change in magnetic flux according to a change in coil current when a bias magnet is installed in a core mid-section according to one embodiment of the present disclosure.

[0049] FIG. 17f is a diagram showing a change in magnetic flux according to a change in coil current when a bias magnet is installed in a core mid-section according to one embodiment of the present disclosure.

[0050] FIG. 17g is a drawing showing a change in magnetic flux according to a change in coil current when a bias magnet is installed in a core mid-section according to one embodiment of the present disclosure.

[0051] FIG. 17h is a diagram showing a change in magnetic flux according to a change in coil current when a bias magnet is installed in a core mid-section according to one embodiment of the present disclosure.

[0052] FIG. 18 is a graph showing the relationship between current and inductance when a bias magnet according to one embodiment of the present disclosure is applied to a core.

[0053] FIG. 19 is a block diagram of a home appliance according to one embodiment of the present disclosure.

[0054] FIG. 20 illustrates an air conditioner using an inductor according to one embodiment of the present disclosure.

[0055] FIG. 21 illustrates a refrigerator using an inductor according to one embodiment of the present disclosure.

[0056] FIG. 22 illustrates a washing machine using an inductor according to one embodiment of the present disclosure.

[0057] FIG. 23 illustrates an induction heating device using an inductor according to one embodiment of the present disclosure.

[0058] The terms used in this disclosure will be briefly explained, and one embodiment of the present disclosure will be specifically described.

[0059] The terms used in this disclosure are selected from widely used, current terms, taking into account the functions of one embodiment of the disclosure. However, these terms may vary depending on the intentions of those skilled in the art, precedents, the emergence of new technologies, etc. Furthermore, in certain cases, terms may be arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the description of the relevant embodiments of the disclosure. Therefore, the terms used in this disclosure should not be defined simply as names of terms, but rather based on the meanings of the terms and the overall content of the disclosure.

[0060] In this disclosure, the expression “at least one of a, b or c” may refer to “a”, “b”, “c”, “a and b”, “a and c”, “b and c”, “all of a, b and c”, or variations thereof.

[0061] Throughout this disclosure, when a part is said to "include" a certain component, this does not mean that other components are excluded, but rather that other components may be included, unless otherwise specifically stated. Furthermore, terms such as "part," "module," etc., used in this disclosure refer to a unit that processes at least one function or operation, and "part" and "module" may be implemented as hardware or software, or as a combination of hardware and software.

[0062] Below, with reference to the attached drawings, embodiments of the present disclosure are described in detail so that those skilled in the art can easily implement the present disclosure. However, one embodiment of the present disclosure may be implemented in various different forms and is not limited to the embodiments described herein. In addition, in the drawings, parts irrelevant to the description are omitted to clearly describe one embodiment of the present disclosure, and similar parts are designated with similar drawing reference numerals throughout the present disclosure.

[0063] FIG. 1A is a circuit diagram of a power conversion device using an inductor according to one embodiment of the present disclosure.

[0064] Referring to FIG. 1A, a circuit diagram of a power conversion device including a power factor correction (PFC) circuit is disclosed. The power conversion device may be a power conversion device included in various home appliances according to an embodiment of the present disclosure.

[0065] The power conversion device (15) is composed of a rectifier (20), a power circuit (30), and a capacitor (37). In Fig. 1a, the power circuit (30) may include, for example, a PFC circuit. The capacitor (37) may be a DC link capacitor or simply a link capacitor. The input power source (10) may be an AC voltage, and the AC voltage may be rectified into a DC voltage through a rectifier (20) including a rectifier circuit. The rectified DC voltage may be established and smoothed as a DC voltage by the capacitor (37) through the power circuit (30). The rectifier circuit may include a bridge diode, but is not limited thereto, and a gate-controllable switch element may replace the diode. The power conversion device (100) is connected to a load (50) and supplies power required by the load (50) to the load (50). The PFC circuit (30) may include an inductor (31), a switch (33), and a diode (35). Increasing the inductance of the inductor (31) in the PFC circuit (30) can reduce the surge current in the misswitching section of the switch (33), but the volume of the system increases. On the other hand, decreasing the inductance of the inductor (31) in the PFC circuit (30) can increase the surge current in the misswitching section of the switch (33). The switch (33) of the PFC circuit (30) can use an active switch element. The switch (33) can be composed of an IGBT (Insulated Gate Bipolar Transistor), a transistor, or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), but is not limited thereto.

[0066] The inductor (31) of the PFC circuit (30) may include a DC inductor in which current flows in only one direction. According to one embodiment of the present disclosure, the inductor (31) may be a DC inductor and include an inductor with an expanded magnetic saturation region, including a bias magnet.

[0067] FIG. 1b is a circuit diagram of a power conversion device using an inductor according to one embodiment of the present disclosure.

[0068] Referring to FIG. 1B, a circuit diagram of a power conversion device using an inductor according to one embodiment of the present disclosure is disclosed. FIG. 1B illustrates a step-down converter (40, buck converter) as the power conversion device. The power conversion device may be a power conversion device included in various home appliances according to one embodiment of the present disclosure.

[0069] In the present disclosure, for example, the voltage across the voltage source (41 in FIG. 1b) corresponding to the DC link capacitor may be reduced and used for the load (50). In one embodiment, if the voltage across the DC link capacitor is 311 V and the load (50) is a device that is charged to 30 V as a type of energy storage device, the power conversion device of FIG. 1b may be a step-down converter (40).

[0070] A step-down converter (40) can convert (step-down convert) a high-voltage input voltage Vin (41) to provide a low voltage to a load (50). A switch (42), a diode (43), an inductor (44), and a capacitor (45) can be used for the step-down conversion. The step-down converter configuration according to FIG. 1B can vary depending on the designer's choice. Since the direction of the current flowing in the inductor (44) does not change, the inductor (44) can be a DC inductor using a bias magnet according to one embodiment of the present disclosure. In the present disclosure, the bias magnet includes a magnet that makes the inductor a biased inductor. In the present disclosure, the bias magnet can include a permanent magnet and / or an electromagnet by a coil. The DC inductor includes an inductor in which the current flowing in the inductor is in one direction.

[0071] Referring to FIG. 1C, a circuit diagram of a power conversion device using an inductor according to one embodiment of the present disclosure is disclosed. The power conversion device may be a power conversion device included in various home appliances according to one embodiment of the present disclosure.

[0072] The power conversion device (60) illustrated in Fig. 1c is a phase shift full bridge converter and can be used for loads with a high step-down ratio. The power conversion device (60) of Fig. 1c has a high voltage input, for example, 400 V, and can step down this input to a low voltage of approximately 12 V to approximately 48 V. The power conversion device (60) may include an inductor (51) including a bias magnet according to one embodiment of the present disclosure.

[0073] Figure 2 shows a BH curve representing the characteristics of an inductor.

[0074] The characteristics of the inductor can be explained by the BH curve shown in Fig. 2. As can be seen from the BH curve in Fig. 2, the magnetization of the magnetic material has nonlinear and hysteresis characteristics.

[0075] In the BH curve, H represents the magnetic field strength. H is the product of the number of coil turns times the current flowing through the coil divided by the magnetic path length (l). In an inductor, if the number of coil turns and the magnetic path length are fixed, H is proportional to the magnitude of the current flowing through the coil. Therefore, the current flowing through the coil wound around the core increases as you move to the right in Figure 2.

[0076] B is the magnetic flux density generated in the magnetic circuit by the inductor. The slope of the B-H curve represents the permeability of the inductor. The permeability of the inductor is proportional to the inductance of the inductor. When the slope of the B-H curve becomes flat, magnetic saturation occurs, which causes the inductance of the inductor to decrease. Therefore, the saturation point indicated in Fig. 2 indicates the point where the slope is small (the slope becomes flat). In the PFC (Power Factor Correction) circuit, the direction of the current flowing through the inductor is always constant. In other words, the inductor used in the PFC circuit is a DC inductor in which the direction of the current is constant. Therefore, the DC inductor needs to be designed so that the operating region (0 current to maximum current) of the PFC (circuit) does not reach the saturation point indicated in Fig. 2. The PFC may include at least one of a boost PFC, a passive PFC, and a buck PFC. In addition, although the BH curve in Fig. 2 is indicated as the operating region of the PFC, it is not necessarily limited thereto. For example, since a DC inductor can also be used in an SMPS, the operating region of the PFC in Fig. 2 can be replaced with the operating region of the SMPS. In addition, if the power conversion circuit uses a DC inductor, the PFC in Fig. 2 can be replaced by such a power conversion circuit.

[0077] As can be seen in Figure 2, in the case of PFC, the direction of the current is constant, so the inductor operates only in the first and fourth quadrants of the BH curve. If the BH curve could be shifted to the right, saturation could not occur at the point where saturation occurs in Figure 2.

[0078] FIG. 3 is a drawing showing moving the BH curve to the right according to one embodiment of the present disclosure.

[0079] In Fig. 3, the initial BH curve is the first BH curve (11) and the BH curve after moving is the second BH curve (12). As seen in Fig. 3, if the first BH curve (11) can be moved to the second BH curve (12), the region where saturation occurs in the first BH curve (11) can become a region where saturation no longer occurs in the second BH curve (12). Therefore, if the first BH curve (11) can be moved like the second BH curve (12), the usability of the DC inductor increases.

[0080] FIG. 4 is a drawing showing a BH curve shifted to the right by applying a bias magnet according to one embodiment of the present disclosure.

[0081] Referring to Fig. 4, the first BH curve (11) can be shifted to the second BH curve (12) by a bias magnet. Therefore, the saturation region in the first BH curve (11) is no longer a saturation region in the second BH curve (12). In addition, the boost converter operating region in the second BH curve (12) becomes much wider than the boost converter operating region in the first BH curve (11). In addition, the flux loss can also be further reduced in the second BH curve (12).

[0082] The core of the inductor that generates the second BH curve (12) in Fig. 4 is called a biased core. When a biased core is used as a DC inductor, the core size can be reduced and hysteresis loss can be reduced.

[0083] FIG. 5 is a drawing showing a bias core in which a bias magnet is placed in an air gap of the core according to one embodiment of the present disclosure.

[0084] Fig. 5 is an example of a bias core (1) showing a bias magnet (5) inserted into an air gap (3) of the core. The bias core (1) according to Fig. 5 is an EE-type core and includes an air gap in the center leg. A permanent magnet may be used as the bias magnet (5). However, when a bias core (1) as shown in Fig. 5 is used, the magnetic flux according to the coil wound on the bias core (1) is applied to the bias magnet (5) in the opposite direction to the magnetic flux of the bias magnet (5). If an overcurrent is applied to the coil due to a fault or momentary overload in a structure as shown in Fig. 5, irreversible demagnetization may occur in the bias magnet (5) because a large magnetic flux may be applied to the bias magnet (5) due to the overcurrent. If irreversible demagnetization occurs in the bias magnet (5), the bias magnet (5) may eventually lose its magnetism. When the bias magnet (5) loses its magnetism, the inductor operates as a normal inductor. Therefore, a bias core design that prevents the bias magnet (5) from becoming demagnetized is required.

[0085] Figure 6 is a drawing showing the generation of fringing flux in a square core.

[0086] When manufacturing a bias core, a bias magnet may be attached to the outer periphery of the core. To prevent irreversible demagnetization of the bias magnet, the bias magnet may be attached to the outer periphery of the core. In this case, an air gap may also be located on the outer periphery of the core to establish the magnetic flux path of the magnet. However, in this case, electromagnetic interference (EMI) problems may occur due to radiated noise caused by fringing flux generated around the air gap. Therefore, if the air gap is located on the outer leg of the core, it may be vulnerable to radiated noise.

[0087] FIG. 7 is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0088] Referring to Fig. 7, the bias magnets (150) included in the core (100) can be arranged in pairs, one above and one below the air gap (110). For convenience of explanation, the magnet above the air gap (110) is referred to as the upper magnet (150a), and the magnet below the air gap (110) is referred to as the lower magnet (150b).

[0089] The core (100) according to FIG. 7 is a path through which the magnetic flux generated by the coil (120) and the bias magnet (150) is mainly conducted. The core (100) may be a ferrite core, but is not limited thereto. The shape of the core (100) may be in the form of PQ, EE, or EI. Therefore, the shape of the core (100) is a shape having three legs and an air gap in the middle leg (middle leg). In order to distinguish the middle leg from the three legs, the middle leg may be referred to as the first leg. Of course, the first leg is relatively used throughout the present disclosure depending on the embodiment, and the leg on which the bias magnet is arranged in the core may be referred to as the first leg.

[0090] The air gap (110) is an empty space located in the middle of the path through which magnetic flux flows and limits the magnitude of the magnetic flux in the magnetic circuit. The air gap (110) functions similarly to a resistor that limits current in an electric circuit. The air gap (110) prevents saturation of the core (100) by limiting the magnitude of the magnetic flux. According to one embodiment of the present disclosure, the air gap may be located in the middle of the core (100).

[0091] The coil (120) is made of a conductor for generating magnetic flux. When current flows through the coil (120), coil magnetic flux (125) is generated by the coil (120). In other words, electrical energy is converted into magnetic energy by the coil (120). The direction of the coil magnetic flux (125) is determined by the direction of the current flowing through the coil (120) and the direction in which the coil (120) is wound. When the coil magnetic flux (125) exceeds the magnetic flux rating of the core (100), inductor saturation occurs. When inductor saturation occurs, the inductor can no longer operate as a normal inductor. Therefore, the core (100) must be designed so that the coil magnetic flux (125) is within the magnetic flux rating of the core (100).

[0092] A magnetic flux is also generated by the bias magnet (150). Let's call this the magnetic flux (155). The direction of the magnetic flux (155) by the bias magnet (150) is from the N pole to the S pole. Due to the magnetic flux resistance by the air gap (110), it is preferable that the magnetic flux is formed so that the magnetic flux comes out from the N pole of the upper magnet (150a) and enters the S pole of the lower magnet (150b). Therefore, according to one embodiment of the present disclosure, the bias magnet (150) can be designed so that the upper part of the upper magnet (150a) becomes the N pole and the lower part becomes the S pole, and similarly, the upper part of the lower magnet (150b) becomes the N pole and the lower part becomes the S pole. However, this is only one embodiment, and the magnetic poles of the upper magnet (150a) and the lower magnet (150b) can be arranged laterally with respect to the air gap (110). According to one embodiment of the present disclosure, when the magnetic poles are arranged horizontally, the inner side of the upper magnet (150a) may be the N pole and the outer side may be the S pole, and the inner side of the lower magnet (150b) may be the S pole and the outer side may be the N pole, based on the midfoot. In one embodiment, the magnetic poles of the bias magnet (150) may be arranged so that the direction of the coil magnetic flux (125) by the coil (120) and the direction of the magnet magnetic flux (155) are opposite. The arrangement of the bias magnet (150) will be described in more detail below.

[0093] In addition, the core (100) is designed so that the direction of the magnetic flux (155) by the bias magnet (150) is opposite to the direction of the coil flux (125) by the coil (120), thereby reducing the size of the total conducted magnetic flux (coil flux (125) - magnet flux (155)).

[0094] FIG. 8a is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0095] The core (100) according to FIG. 8a shows how the magnetic poles of the bias magnet (150) are arranged in the core structure of FIG. 7. According to one embodiment of the present disclosure, the magnetic poles are arranged so that the direction of the magnetic flux (155) by the bias magnet (150) is opposite to the direction of the coil magnetic flux (125). As shown in FIG. 8a, when the inner side of the upper magnet (150a) is arranged as the N pole and the outer side as the S pole, and the inner side of the lower magnet (150b) is arranged as the S pole and the outer side as the N pole, the magnetic flux (155) becomes opposite to the direction of the coil magnetic flux (125). The magnetic flux (155) coming from the N pole of the upper magnet (150a) cannot flow downward due to the magnetic flux resistance called the air gap (110), but flows upward along the middle of the core (100). The magnetic flux (155) flowing upwards through the core (100) enters the S pole arranged on the inside of the lower magnet (150b).

[0096] FIG. 8b is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0097] The core (100) according to FIG. 8b shows how the magnetic poles of the bias magnet (150) are arranged in the core structure of FIG. 7. In addition, in the core (100) according to FIG. 8b, the direction of the coil (120) is wound opposite to that in FIG. 8a, so that the direction of the coil magnetic flux (125) is opposite to that of the coil magnetic flux (125) in FIG. 8a. Therefore, the magnetic poles of the bias magnet (150) are arranged so that the direction of the magnet magnetic flux (155) is formed in the opposite direction to that of the coil magnetic flux (125). According to one embodiment of the present disclosure, the inner side of the upper magnet (150a) of the bias magnet (150) according to FIG. 8b is arranged such that the inner side becomes the S pole and the outer side becomes the N pole, and the inner side of the lower magnet (150b) is arranged such that the inner side becomes the N pole and the outer side becomes the S pole. By this arrangement of stimuli, the direction of the magnet flux (155) becomes opposite to the direction of the coil flux (125).

[0098] As described above, the magnetic flux (155) from the N pole of the lower magnet (150b) cannot flow upward due to the air gap (110) and flows downward along the middle of the core (100). The magnetic flux (155) flowing downward along the middle of the core (100) enters the S pole arranged on the inside of the upper magnet (150a).

[0099] FIG. 8c is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0100] In contrast to the magnetic poles of the bias magnets (150) in the core (100) structures of FIGS. 8a and 8b, which were arranged horizontally, the magnetic poles of the bias magnets (150) are arranged vertically in FIG. 8c. When the magnetic poles of the bias magnets (150) are arranged vertically, if the magnetic flux (155) is arranged in the opposite direction to the coil flux (125), the core (100) can become a bias core structure. However, when the magnetic poles of the bias magnets (150) are arranged vertically as in FIG. 8c, the strength of the magnetic poles must be a little stronger than in the core (100) structures of FIGS. 8a and 8b, in which the magnetic poles of the bias magnets (150) are arranged horizontally, to obtain an effect similar to that of the core (100) structure including the bias magnets (150) according to FIGS. 8a and 8b.

[0101] Referring to Fig. 8c, the upper magnet (150a) and the lower magnet (150b) are arranged with the N pole at the upper portion and the S pole at the lower portion. When the magnetic flux (155) is generated from the N pole of the upper magnet (150a), the magnetic flux cannot flow to the lower portion of the midfoot of the core (100) due to the air gap (110), but flows to the upper portion of the midfoot of the core (100). The magnetic flux (155) generated from the N pole of the upper magnet (150a) flows along the core (100) and enters the S pole of the lower magnet (150b). Of course, this is just one example, and if the direction in which the coil (120) is wound is reversed, the arrangement of the bias flux (150) also changes. An example of this is illustrated in Fig. 8d.

[0102] FIG. 8d is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0103] In Fig. 8d, as in Fig. 8c, the magnetic poles of the bias magnet (150) are arranged longitudinally. However, in Fig. 8d, the direction of the coil magnetic flux (125) is opposite to that in Fig. 8c.

[0104] Referring to Fig. 8d, a south pole is arranged at the top of the lower magnet (150b) and a north pole is arranged at the bottom. When the magnetic flux (155) comes out from the north pole of the lower magnet (150b), the magnetic flux cannot flow to the top of the middle of the core (100) due to the air gap (110) and instead flows to the bottom of the middle of the core (100). In addition, a south pole is arranged at the top of the upper magnet (150a) and a north pole is arranged at the bottom. The magnetic flux (155) coming out from the north pole of the lower magnet (150b) flows along the core (100) and then enters the south pole of the upper magnet (150a).

[0105] FIG. 9a is a core structure in which a bias magnet is formed on a side group according to one embodiment of the present disclosure.

[0106] While the core structure of FIGS. 8a to 8d had an air gap (110) in the middle, the core (100) according to FIG. 9a has air gaps (110) located in both side groups. In the core (100) according to FIGS. 9a to 9d, the first group (101) is a side group on both sides, and there is no air gap in the middle group (103). The shape of the core (100) may be in the form of PQ, EE, or EI.

[0107] According to one embodiment of the present disclosure, a bias magnet (150) may be placed on both side groups of the first group (101) having an air gap (110). The bias magnet (150) may be positioned above and below the air gap (110) in both side groups. The magnetic pole of the bias magnet (150) is placed such that the direction of the magnetic flux (155) generated by the bias magnet (150) is opposite to the direction of the magnetic flux (125) of the coil.

[0108] According to Fig. 9a, when the S pole is arranged on the inner side of the upper magnet (150a) and the N pole is arranged on the outer side, and the N pole is arranged on the inner side of the lower magnet (150b) and the S pole is arranged on the outer side, the magnetic flux (155) becomes opposite to the direction of the coil magnetic flux (125). The magnetic flux (155) coming from the N pole of the lower magnet (150b) cannot flow upward due to the air gap (110) and flows downward along the side group of the core (100). The magnetic flux (155) flowing downward along the side group of the core (100) passes through the middle group and enters the S pole arranged on the inner side of the upper magnet (150a).

[0109] Of course, this is just one example, and if the coil (120) in FIG. 9a is wound in the opposite direction, the magnetic pole arrangements of the upper magnet (150a) and the lower magnet (150b) are reversed. Accordingly, if the direction in which the coil (120) is wound in the opposite direction in FIG. 9a, the direction of the coil magnetic flux (125) will also be reversed, and therefore the direction of the magnet magnetic flux (155) must also be reversed. To this end, the magnetic poles are arranged so that the inner side of the upper magnet (150a) becomes the N pole and the outer side becomes the S pole, and the inner side of the lower magnet (150b) becomes the S pole and the outer side becomes the N pole.

[0110] FIG. 9b is a core structure in which a bias magnet is formed on a side group according to one embodiment of the present disclosure.

[0111] The core (100) according to Fig. 9b also has air gaps (110) located on both sides of the core (100) as in Fig. 9a.

[0112] The bias magnet (150) according to FIG. 9b is an example that, unlike that in FIG. 9a, does not surround the entire side group but only a portion of the side group. In FIG. 9b, the upper magnet (150a) and the lower magnet (150b) may be magnets that surround at least a portion of the side group (101), rather than the entire side group. According to one embodiment of the present disclosure, in the core (100) of FIG. 9b, the upper magnet (150a) of the right side group has its magnetic poles arranged only on the outer side, and the lower magnet (150b) has its magnetic poles arranged only on the inner side of the right side group. Conversely, in the core (100) of FIG. 9b, the upper magnet (150a) of the left side group has its magnetic poles arranged only on the inner side, and the lower magnet (150b) has its magnetic poles arranged only on the outer side of the left side group. The magnetic poles are arranged so that the magnetic flux flowing out or in from each magnetic pole flows in the opposite direction to the magnetic flux by the coil (120).

[0113] According to Fig. 9b, when the inner side of the upper magnet (150a) is arranged as the S pole and the outer side as the N pole, and the inner side of the lower magnet (150b) is arranged as the N pole and the outer side as the S pole, the magnetic flux (155) becomes opposite to the direction of the coil magnetic flux (125). The magnetic flux (155) coming from the N pole of the lower magnet (150b) cannot flow upward due to the air gap (110) but flows downward along the side pole of the core (100). The magnetic flux (155) flowing downward along the side pole of the core (100) passes through the middle pole and enters the S pole arranged on the inner side of the upper magnet (150a).

[0114] According to one embodiment of the present disclosure, the fact that the upper magnet (150a) and the lower magnet (150b) do not completely surround the side group (101), but rather at least partially surround it, means that they do not necessarily completely surround the side group (101).

[0115] FIG. 9c is a core structure in which a bias magnet is formed on a side group according to one embodiment of the present disclosure.

[0116] In contrast to the magnetic poles of the bias magnets (150) in the core (100) structures of FIGS. 9a and 9b, which were arranged horizontally, the magnetic poles of the bias magnets (150) in FIG. 9c are arranged vertically. When the magnetic poles of the bias magnets (150) are arranged vertically, if the magnetic flux (155) is arranged in the opposite direction to the coil flux (125), the core (100) can have a bias core structure.

[0117] Referring to Fig. 9c, the upper magnet (150a) and the lower magnet (150b) have the S pole and the lower magnet has the N pole, respectively.

[0118] When the magnetic flux (155) comes out from the N pole of the lower magnet (150b), the magnetic flux cannot flow to the upper part of the side group (101) of the core (100) due to the air gap (110), but flows to the lower part of the side group (101). The magnetic flux (155) coming out from the N pole of the lower magnet (150b) flows along the core (100) and enters the S pole of the upper magnet (150a) through the middle group (103). Of course, this is just one example, and if the direction in which the coil (120) is wound is reversed, the magnetic pole arrangement of the bias flux (150) also becomes reversed. For example, in FIG. 9c, if the direction in which the coil (120) is wound is reversed, the direction of the coil flux (125) changes, so the direction of the magnetic flux (155) by the bias magnet (150) also needs to be reversed. Therefore, the upper magnet (150a) and the lower magnet (150b) should have the N pole and the lower magnet should have the S pole respectively.

[0119] FIG. 9d is a core structure in which a bias magnet is formed on a side group according to one embodiment of the present disclosure.

[0120] In Fig. 9d, as in Fig. 9c, the magnetic poles of the upper magnet (150a) and the lower magnet (150b), which are bias magnets (150), are arranged vertically, but as in Fig. 9b, the upper magnet (150a) and the lower magnet (150b) do not surround the entire side group, but rather surround only a part of the side group. This is an example.

[0121] According to one embodiment of the present disclosure, in the core (100) of FIG. 9d, the upper magnet (150a) of the right side group has a magnetic pole arranged only on the inner side, and the lower magnet (150b) has a magnetic pole arranged only on the outer side of the right side group. Conversely, in the core (100) of FIG. 9d, the upper magnet (150a) of the left side group has a magnetic pole arranged only on the inner side, and the lower magnet (150b) has a magnetic pole arranged only on the outer side of the left side group. The magnetic poles are arranged so that the magnetic flux flowing out of or into each magnetic pole flows in the opposite direction to the magnetic flux by the coil (120).

[0122] According to Fig. 9d, when the magnetic poles of the upper magnet (150a) are arranged so that the upper pole becomes the S pole and the lower pole becomes the N pole, and when the magnetic poles of the lower magnet (150b) are also arranged so that the lower pole becomes the N pole and the upper pole becomes the S pole, the magnetic flux (155) becomes opposite to the direction of the coil magnetic flux (125). The magnetic flux (155) coming from the N pole of the lower magnet (150b) cannot flow upward due to the air gap (110) but flows downward along the side pole (101) of the core (100). The magnetic flux (155) flowing downward along the side pole of the core (100) enters the S pole arranged on the upper portion of the upper magnet (150a) through the middle pole (103).

[0123] FIG. 10A illustrates a structure in which a bias magnet is attached to a square-shaped core according to one embodiment of the present disclosure.

[0124] If the core according to the previous drawings 7, 8a to 9d was a core including a midfoot, the core (100) according to drawings 10a to 10d is a rectangular core without a midfoot.

[0125] According to one embodiment of the present disclosure, the core (100) of FIG. 10A may include a first group (101) including an air gap (110) and a second group (102) around which a coil (120) is wound. A bias magnet (150) may be attached to the core (100) above and below the air gap (110) with the air gap (110) as the center. The magnet above the air gap (110) may be referred to as an upper magnet (150a), and the magnet below it may be referred to as a lower magnet (150b). The magnetic pole of the bias magnet (150) is arranged so that the direction of the magnetic flux (155) by the bias magnet (150) is opposite to the direction of the coil flux (125) by the coil (120), as described above.

[0126] In Fig. 10a, since the coil flux (125) flows counterclockwise by the coil (120), the magnet flux (155) should flow clockwise. Accordingly, the inner side of the upper magnet (150a) of the bias magnet (150) becomes the S pole, and the outer side becomes the N pole, and the inner side of the lower magnet (150b) becomes the N pole, and the outer side becomes the S pole.

[0127] In the core (100) according to FIGS. 8a to 8d, the bias magnets (150) had to be arranged so that they almost surrounded both sides or all four sides of the middle group. On the other hand, in FIG. 10a, the magnetic flux flowing from the first group (101) cannot help but flow toward the second group (102), so even if the upper magnet (150a) and the lower magnet (150b) are attached only to the outer surface of the first group (101) as shown, the magnetic flux (155) as shown in FIG. 10a can be formed.

[0128] FIG. 10a shows an example in which the upper magnet (150a) and the lower magnet (150b) are attached only to the outer surface of the first group (101), but due to the characteristics of the square-shaped core, even if the upper magnet (150a) and the lower magnet (150b) are attached only to the inner surface of the first group (101), a desired magnetic flux (155) can be formed.

[0129] An example of such an example is shown in Fig. 10b.

[0130] FIG. 10b illustrates a structure in which a bias magnet is attached to a square-shaped core according to one embodiment of the present disclosure.

[0131] The core structure of Fig. 10b differs from that of Fig. 10a in that the upper magnet (150a) and the lower magnet (150b) of the bias magnet (150) are arranged on the inside of the first group (101) with the air gap (110) as the center. In addition to the core structure of Fig. 10b, either the upper magnet (150a) or the lower magnet (150b) may be arranged on the outside of the first group (101), and either may be arranged on the inside of the first group (101). Examples of such arrangements are shown in Figs. 10c and 10d.

[0132] FIG. 10c illustrates a structure in which a bias magnet is attached to a square-shaped core according to one embodiment of the present disclosure.

[0133] In the core structure according to Fig. 10c, the upper magnet (150a) is placed on the inner side of the first group (101), and the lower magnet (150b) is placed on the outer side of the first group (101). As described above, the magnetic poles of the upper magnet (150a) and the lower magnet (150b) are placed so that the direction of the magnet flux (155) is opposite to the direction of the coil flux (125).

[0134] FIG. 10d illustrates a structure in which a bias magnet is attached to a square-shaped core according to one embodiment of the present disclosure.

[0135] The core structure according to Fig. 10d is a structure in which, contrary to Fig. 10c, the upper magnet (150a) is arranged on the outer side of the first group (101), and the lower magnet (150b) is arranged on the inner side of the first group (101). However, it is preferable to understand that the outer side and the inner side in Figs. 10a to 10d are at least a portion of the entire length surrounding the first group (101). As can be seen from Figs. 10a to 10d, in the core structure having a square shape, the magnetic pole of the upper magnet (150a) is arranged on at least a portion of the upper side of the air gap (110), and the magnetic pole of the lower magnet (150b) is arranged on at least a portion of the lower side of the air gap (110). In other words, as shown in FIGS. 10a to 10d, there is no problem in functioning as a bias core if the core structure allows the magnetic flux (155) to be formed not only in the case where the magnetic pole is arranged on the inside or outside of the first group (101), but also in the case where the magnetic pole is arranged only on at least a portion of the periphery of the first group (101) so as to form the magnetic flux (155) according to FIGS. 10a to 10d. The cross-sectional structure in which the bias magnet (150) surrounds the core of the first group (101) will be described in detail later.

[0136] FIG. 11a is a core structure with a bias magnet attached by a coil according to one embodiment of the present disclosure.

[0137] The core (100) according to the previous drawings 8a to 10d uses a bias magnet (150) to operate as a bias core, but the bias magnet (150) can be replaced with a bias electromagnet (151) by an electromagnet coil.

[0138] According to one embodiment of the present disclosure, a core is illustrated in FIG. 11A using a bias electromagnet (151) by an electromagnet coil instead of a bias magnet (150). The direction of the magnetic flux (155) by the bias electromagnet (151) should be opposite to the direction of the magnetic flux by the coil (120), as in the case where the previous bias magnet (150) is used. According to one embodiment of the present disclosure, the bias electromagnet (151) may be positioned above the air gap (110). The electromagnet coil constituting the bias electromagnet (151) may be wound in the opposite direction to the winding direction of the coil (120) in consideration of the magnetic flux direction.

[0139] Unlike the case where the bias magnet (150) is used both above and below the air gap (110) in the previous FIGS. 8a to 8d, the bias electromagnet (151) can be positioned only above or below the air gap (110) to form the magnetic flux path shown in FIG. 11a by the bias electromagnet (151).

[0140] In the core (100) according to Fig. 11a, the first group (101) is a middle group, and since there is an air gap (110) in the middle group, an electromagnet coil can be wound on the upper or lower side of the air gap (110) to form a bias electromagnet (151).

[0141] In Fig. 11a, the bias electromagnet (151) is positioned above the air gap (110), while Fig. 11b illustrates an example in which the bias electromagnet (151) is positioned below the air gap (110). Even when the bias electromagnet (151) is positioned below the air gap (110), a bias core can be formed in the same manner as in the case of the core (100) in Fig. 11a.

[0142] FIG. 11C illustrates a core in which bias electromagnets (151) are positioned on both side groups other than the middle group with an air gap (110) according to one embodiment of the present disclosure. As described above, the coil of the bias electromagnet (151) may be positioned anywhere within the core (100) as long as it is wound so that a magnetic flux (155) is formed in the opposite direction to the coil flux (125) by the coil (120) of the core (100). In FIG. 11C, bias electromagnets (151) are positioned on both side groups without an air gap (110). FIG. 11C illustrates that both side groups can be the first group (101) according to one embodiment of the present disclosure.

[0143] FIG. 12a is a core structure with a bias magnet attached by a coil according to one embodiment of the present disclosure.

[0144] The core (100) of Fig. 12a has a structure with air gaps on both sides, like the cores according to Figs. 9a to 9d.

[0145] The core (100) may include a left air gap (110a) included in the left side group and a right air gap (110b) included in the right side group. According to one embodiment of the present disclosure, bias electromagnets (151) may be respectively arranged in both side groups of the first group (101). The bias electromagnet (151) is an electromagnet formed by a coil rather than a magnet having a magnetic pole as described with reference to FIGS. 11A and 11B. The coil of the bias electromagnet (151) may be wound so that a magnetic flux (155) is formed in the opposite direction to the coil flux (125) by the coil (120) of the core (100). In Fig. 12a, the right bias electromagnet (151) is shown as being wound on the upper side of the right air gap (110b) and the left bias electromagnet (151) is shown as being wound on the lower side of the left air gap (110a). However, this is only one example, and the bias electromagnet (151) can theoretically be located anywhere in the core (100) as long as it can generate a magnet flux (155) direction opposite to the coil flux (125) direction by the coil (120). Therefore, as in Fig. 12b, the bias electromagnet (151) can be located anywhere in the core (100), unlike in Figs. 9a to 9d, where the bias magnet (150) is located near the air gap (110).

[0146] FIG. 12b is a core structure with a bias magnet attached by a coil according to one embodiment of the present disclosure.

[0147] According to FIG. 12b, a bias electromagnet (151) by an electromagnet coil is positioned in a mid-foot without an air gap (110) according to one embodiment of the present disclosure. The direction of the magnetic flux (155) formed by the bias electromagnet (151) is opposite to the direction of the coil flux (125) by the coil (120). At this time, the mid-foot becomes the first foot (101) where the bias electromagnet (151) is positioned.

[0148] Figures 12a and 12b are only examples, and as previously described, the bias electromagnet (151) by the electromagnet coil can be located at any position that can form a magnetic flux (155) that forms a direction opposite to the magnetic flux by the coil (120).

[0149] FIG. 13a is a core structure with a bias magnet attached by a coil according to one embodiment of the present disclosure.

[0150] The core (100) of Fig. 13a has a structure in which an air gap (110) is formed in the first group (101), which is one side group, of a square-shaped core, similar to the cores according to Figs. 10a to 10d. According to one embodiment of the present disclosure, a bias electromagnet (151) may be placed in the first group (101) having the air gap (110). In this case, the bias electromagnet (151) may be placed above or below the air gap (110). As in the previous example, the coil of the bias electromagnet (151) may be wound so that a magnetic flux (155) is formed in the opposite direction to the coil flux (125) by the coil (120) of the core (100). In addition, theoretically, if a magnetic flux (155) direction opposite to the coil flux (125) direction by the coil (120) can be generated, the bias electromagnet (151) can be located anywhere within the core (100). Therefore, as in FIG. 13b, the bias electromagnet (151) can be located anywhere within the core (100), unlike in FIGS. 10a to 10d, where the bias magnet (150) was located near the air gap (110).

[0151] FIG. 13b is a core structure with a bias magnet attached by a coil according to one embodiment of the present disclosure.

[0152] According to FIG. 13b, a bias electromagnet (151) by an electromagnet coil is positioned on a side group without an air gap (110) according to one embodiment of the present disclosure. Therefore, the side group where the bias electromagnet (151) is positioned becomes the first group (101). Accordingly, both the coil (120) that generates coil flux (125) and the bias electromagnet (151) that generates magnet flux (155) are wound on the first group (101). The direction of the magnet flux (155) formed by the bias electromagnet (151) is opposite to the direction of the coil flux (125) by the coil (120).

[0153] FIG. 14a is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0154] FIG. 14a is a structure of a core (100) in which a bias magnet (150) is attached to a leg cross-section of the core (100) according to one embodiment of the present disclosure. While the bias magnets (150) disclosed in FIGS. 8a to 13b were not on the path of the coil magnetic flux (125), the bias magnet (150) according to FIG. 14a is on the path of the coil magnetic flux (125). According to one embodiment of the present disclosure, the bias magnet (150) according to FIG. 14a is placed on the cross-section of the first leg (101) facing each other with an air gap (110).

[0155] Continuing with reference to FIG. 14a, 1401 and 1403 are perspective views showing cross-sections where a bias magnet (150) is attached when the first group (101) is circular or rectangular, respectively. In FIG. 14a, the bias magnet (150) can be placed at one or both of the cross-sections between the air gap (110) in the first group (101).

[0156] According to one embodiment of the present disclosure, the cross-sectional area of ​​the bias magnet (150) as seen in 1401 and 1403 has a smaller area than the cross-sectional area of ​​the first group (101). According to one embodiment of the present disclosure, the cross-sectional area of ​​the bias magnet (150) of 1401 and 1403 has a smaller area than the cross-sectional area of ​​the first group (101) and can be positioned at the exact center of the cross-sectional area of ​​the first group (101).

[0157] The bias magnet (150) generates a magnet flux (155) in the opposite direction to the coil flux (125) by the coil (120), as in the previous embodiment.

[0158] FIG. 14b is a core structure with a bias magnet attached according to one embodiment of the present disclosure.

[0159] In Fig. 14b, the core (100) does not have an air gap in the middle, but has air gaps in both side groups. According to one embodiment, a bias magnet (150) is positioned on a left side group cross-section including a left air gap (110a), and also a bias magnet (150) is positioned on a right side group cross-section including a right air gap (110b). As in Fig. 14a, the cross-sectional area of ​​the bias magnet (150) is smaller than the area of ​​the side group cross-section. According to one embodiment of the present disclosure, the cross-sectional area of ​​the bias magnet (150) may be positioned at the exact center of the side group cross-section while having an area smaller than the area of ​​the side group cross-section.

[0160] FIG. 15A is a cross-sectional view of a bias magnet according to one embodiment of the present disclosure.

[0161] Referring to Fig. 15a, a cross-sectional view of a bias magnet (150) is illustrated. Since the bias magnet (150) of Fig. 15a has a circular shape, the legs of the core that the bias magnet (150) wraps around must be circular. The 1501 magnet has an outer pole as the N pole and an inner pole as the S pole, and the 1502 magnet has the opposite. In one embodiment, when the middle cross-section of the core (100) according to Fig. 8a is circular, the 1501 magnet of the bias magnet (150) of Fig. 15a can be used as a lower magnet (150b), and the 1502 magnet can be used as an upper magnet (150a). Alternatively, when the cross-section of the middle foot of the core (100) according to FIG. 8b is circular, the 1501 magnet of the bias magnet (150) of FIG. 15a can be used as the upper magnet (150a), and the 1502 magnet can be used as the lower magnet (150b). Alternatively, when the cross-section of the first foot (101) of the core (100) according to FIG. 9a is circular, the 1501 magnet of the bias magnet (150) of FIG. 15a can be used as the upper magnet (150a), and the 1502 magnet can be used as the lower magnet (150b).

[0162] FIG. 15b is a cross-sectional view of a bias magnet according to one embodiment of the present disclosure.

[0163] Referring to Fig. 15b, a cross-sectional view of a bias magnet (150) is illustrated. Similar to the bias magnet (150) of Fig. 15a, the legs of the core that the bias magnet (150) wraps around must be circular, but the difference is that the bias magnet (150) is not perfectly circular. The 1503 magnet has an outer pole as the N pole and an inner pole as the S pole, while the 1504 magnet has the opposite. Although the bias magnet (150) of Fig. 15b is semicircular, this is only an example, and the bias magnet (150) of Fig. 15b can be replaced by any bias magnet (150) that can wrap a circular core leg but is not perfectly circular. In one embodiment, when the cross-section of the midfoot of the core (100) according to FIG. 8a is circular, the 1503 magnet among the bias magnets (150) of FIG. 15b can be used as the lower magnet (150b), and the 1504 magnet can be used as the upper magnet (150a). Of course, in this case, the bias magnet (150) will not surround the entire midfoot according to FIG. 8a, but will surround only a portion of it. In addition, when the cross-section of the core leg that the bias magnet (150) surrounds in the core (100) according to FIGS. 8b, 9a, 9b, and 10a to 10d is circular, the bias magnet (150) of FIG. 15b can be used.

[0164] FIG. 15c is a cross-sectional view of a bias magnet according to one embodiment of the present disclosure.

[0165] Referring to Fig. 15c, a cross-sectional view of a bias magnet (150) is illustrated. Since the bias magnet (150) of Fig. 15c has a rectangular shape, the legs of the core that the bias magnet (150) wraps around must be rectangular. The 1505 magnet has an outer pole as the N pole and an inner pole as the S pole, and the 1506 magnet has the opposite. In one embodiment, when the central cross-section of the core (100) according to Fig. 8a is rectangular, the 1505 magnet of the bias magnet (150) of Fig. 15c can be used as a lower magnet (150b), and the 1506 magnet can be used as an upper magnet (150a). Alternatively, when the cross-section of the middle foot of the core (100) according to FIG. 8b is square, the 1505 magnet among the bias magnets (150) of FIG. 15c can be used as the upper magnet (150a), and the 1506 magnet can be used as the lower magnet (150b). Alternatively, when the cross-section of the first foot (101) of the core (100) according to FIG. 9a is square, the 1505 magnet among the bias magnets (150) of FIG. 15c can be used as the upper magnet (150a), and the 1506 magnet can be used as the lower magnet (150b).

[0166] FIG. 15d is a cross-sectional view of a bias magnet according to one embodiment of the present disclosure.

[0167] Since the bias magnet (150) of Fig. 15d has a rectangular shape, the legs of the core that the bias magnet (150) wraps around must be rectangular. However, while the bias magnet (150) of Fig. 15c wraps around the entire rectangular core leg, the bias magnet (150) of Fig. 15d differs in that four magnets are attached to each of the four faces of the rectangular core leg. Therefore, although Fig. 15d illustrates that magnets are attached to all four faces of the square, this is only one example, and magnets may be attached to only some of the four faces (one face, two faces, or three faces).

[0168] The 1507 magnet has an outer magnetic pole of the N pole and an inner magnetic pole of the S pole, and the 1508 magnet has the opposite. In one embodiment, when the mid-section of the core (100) according to FIG. 8a is square, the 1507 magnet of the bias magnet (150) of FIG. 15d can be used as a lower magnet (150b) and the 1508 magnet can be used as an upper magnet (150a). Alternatively, when the mid-section of the core (100) according to FIG. 8b is square, the 1507 magnet of the bias magnet (150) of FIG. 15d can be used as an upper magnet (150a) and the 1508 magnet can be used as a lower magnet (150b). Alternatively, when the cross-section of the first group (101) of the core (100) according to FIG. 9a is square, the 1507 magnet among the bias magnets (150) of FIG. 15d can be used as the upper magnet (150a), and the 1508 magnet can be used as the lower magnet (150b).

[0169] If the bias magnet (150) of Fig. 15d does not have magnets attached to all four faces of the core legs, but has magnets attached to two faces that face each other, or has magnets attached to three or fewer of the four faces of the core legs, it can be applied to all of the bias magnets (150) of the preceding Figs. 8a, 8b, 9a, 9b, and 10a to 10d.

[0170] FIG. 15e is a cross-sectional view of a bias magnet according to one embodiment of the present disclosure.

[0171] The bias magnet (150) of Fig. 15e must have a leg of the core that the bias magnet (150) wraps around that must be square. However, while the bias magnet (150) of Fig. 15d has four magnets attached to all four sides of the square core legs, the bias magnet (150) of Fig. 15e differs in that the magnet is attached to only one side of the square core leg.

[0172] The 1509 magnet has an outer pole of N and an inner pole of S, while the 1510 magnet has the opposite. In one embodiment, when the cross-section of the first group (101) of the core (100) according to FIG. 9a is square, the 1509 magnet of the bias magnet (150) of FIG. 15e can be used as an upper magnet (150a), and the 1510 magnet can be used as a lower magnet (150b).

[0173] The bias magnet (150) of Fig. 15e can be applied to all of the bias magnets (150) of Figs. 8a, 8b, 9a, 9b, and 10a to 10d.

[0174] FIG. 15f is a perspective view of a bias magnet according to one embodiment of the present disclosure.

[0175] If the bias magnets of FIGS. 15a to 15e are magnets attached transversely to the core (100) legs, the bias magnet of FIG. 15f is a magnet attached longitudinally to the core (100) legs - with the N pole and S pole arranged in a direction parallel to the legs.

[0176] Referring to FIG. 15f, magnets 1511 and 1512 are bias magnets that can be used when the legs of the core (100) are circular. Magnets 1513 and 1514 are bias magnets that can be used when the legs of the core (100) are square.

[0177] In one embodiment, magnets 1511 and 1513 are bias magnets that surround the entire core (100) leg. On the other hand, magnets 1512 and 1514 are magnets that can surround a portion of the core (100) leg. An example of applying a bias magnet that surrounds the entire core (100) leg and a magnet that can surround a portion of the core (100) leg has been described in detail through the preceding FIGS. 15a to 15e, and thus will be omitted here.

[0178] FIG. 16 is a drawing showing a bobbin structure according to one embodiment of the present disclosure.

[0179] A bobbin is a type of container on which a coil is wound, and is a structure used to support a core (100) and a bias magnet (150). For example, a hole is provided in the center of the 1601 bobbin of FIG. 16 into which a leg of the core (100)—for example, a midfoot—is inserted. For example, a midfoot of an EI core (100) can be inserted into this hole, and a coil can be wound around the bobbin's main shaft (1610).

[0180] Referring to Fig. 16, the 1601 bobbin is a basic bobbin, in which the legs of the core (100) are inserted into holes in the column (1610), and a coil can be wound around the column (1610). The bobbin columns of Fig. 16 may have a circular or rectangular cross-section depending on the shape of the core (100).

[0181] The bobbin 1602 includes a space where a bias magnet (150) can be attached and supported around the legs of the core (100) according to one embodiment of the present disclosure. The column (1612) of the bobbin 1602 has a space where a bias magnet (150) can be attached that can surround at least a portion of the legs of the core (100). For example, in the case where magnets are attached only to a portion of the rectangular cross-section in the preceding FIGS. 15b and 15d, the bias magnets according to 1512 and 1514 in FIGS. 15e and 15f can be placed in this space.

[0182] The bobbin 1603 includes a space to which a bias magnet (150) can be attached around the legs of the core (100) according to one embodiment of the present disclosure. The column (1613) of the bobbin 1603 has a space to which a bias magnet (150) can be attached that can completely surround the legs of the core (100). For example, in the case where magnets are attached to all cross sections in the preceding FIGS. 15a, 15c, and 15d, and in FIG. 15f, bias magnets according to 1511 and 1513 can be placed in this space.

[0183] FIG. 17a is a diagram showing a change in magnetic flux according to a change in coil current when a bias magnet is installed in the core midfoot according to one embodiment of the present disclosure.

[0184] Figures 17a to 17d are drawings briefly showing simulation results - changes in magnetic flux - in which the magnetic flux of the core (100) changes according to changes in the current of the coil (120).

[0185] Referring to Fig. 17a, for example, a change in magnetic flux when 0.1 A is applied to a coil (120) in a core (100) structure such as that in Fig. 8a is illustrated. The magnitude (strength) of the magnetic flux flowing in the core (100) illustrated in Figs. 17a to 17d is proportional to the length of the arrow line corresponding to the core magnetic flux (175). The core magnetic flux (175) is the vector sum of the coil magnetic flux according to the coil (120) and the magnet magnetic flux due to the bias magnet (150).

[0186] In the case of Fig. 17a, since the coil (120) current flowing in the current core (100) is small, the coil magnetic flux is hardly generated and most of the core magnetic flux (175) flowing in the core (100) is the magnetic flux caused by the bias magnet (150). Therefore, when the current of the coil (120) is very small, the magnetic flux according to the N pole and S pole of the bias magnet (150) becomes the main magnetic flux that forms the core magnetic flux (175).

[0187] Referring to Fig. 17b, the change in magnetic flux within the core (100) when a coil current of 10.1 A flows through the coil (120) is shown.

[0188] The core flux (175) according to Fig. 17b is still greater than the coil flux due to the bias magnet (150) as in Fig. 17a. However, compared to the case of Fig. 17a, since the current flowing through the coil (120) increases, the intensity of the coil flux due to the coil (120) increases, and the magnitude of the magnetic flux due to the bias magnet (150) becomes relatively smaller. Accordingly, it can be seen that the intensity (length of the arrow) of the core flux (175) becomes smaller than in the case of Fig. 17a.

[0189] Referring to Fig. 17c, a current of 15.1 A flows through the coil (120), and the magnitude of the coil magnetic flux due to the current flowing through the coil (120) is now greater than the magnet magnetic flux. Therefore, a magnetic flux direction is formed according to the coil magnetic flux due to the current flowing through the coil (120). The change in the magnetic flux within the core (100) from Fig. 17b to Fig. 17c corresponds to the B value moving from the fourth quadrant to the first quadrant in the second BH curve (12) of Fig. 4.

[0190] Referring to Fig. 17d, a 20.1 A current flows through the coil (120), and the coil magnetic flux due to the current flowing through the coil (120) becomes the main magnetic flux forming the core magnetic flux (175). It can be seen that the intensity of the core magnetic flux (175) according to Fig. 17d is greater than that of the core magnetic flux (175) according to Fig. 17c. The increase in the intensity of the coil magnetic flux as shown in Fig. 17d corresponds to approaching the saturation region in the first quadrant in the second BH curve (12) of Fig. 4. However, since the bias magnet (150) is applied, even if a 20.1 A current flows through the coil (120), the core (100) is not saturated.

[0191] FIGS. 17e to 17h are diagrams showing changes in magnetic flux according to changes in coil current when a bias magnet is installed in a core mid-section according to one embodiment of the present disclosure.

[0192] Figures 17e to 17h are drawings briefly showing simulation results - changes in magnetic flux - in which the magnetic flux of the core (100) changes according to changes in the current flowing in the coil (120).

[0193] The magnetic flux changes according to FIGS. 17e to 17h are basically the same as those of FIGS. 17a to 17d, except that the bias magnet (150) is installed in the mid-section of the core (100).

[0194] Referring to Fig. 17e, for example, a change in magnetic flux is illustrated when a current of 0.1 A flows through a coil (120) in a core (100) structure such as that in Fig. 14a. The magnitude of the core magnetic flux (175) flowing in the core (100) illustrated in Figs. 17e to 17h is proportional to the length of the arrow line. The core magnetic flux (175) is the vector sum of the coil magnetic flux according to the coil (120) and the magnet magnetic flux due to the bias magnet (150).

[0195] In the case of Fig. 17e, since the current of the coil (120) flowing in the current core (100) is small, the coil magnetic flux is hardly generated and most of the magnetic flux (175) flowing in the core (100) is the magnetic flux caused by the bias magnet (150). Therefore, when the current of the coil (120) is very small, such as 0.1 A, the magnetic flux according to the N pole and S pole of the bias magnet (150) becomes the main magnetic flux that forms the core magnetic flux (175).

[0196] Referring to FIG. 17f, the change in core magnetic flux (175) when a current of 10.1 A flows through the coil (120) is shown.

[0197] Referring to Fig. 17f, as in Fig. 17e, the magnetic flux due to the bias magnet (150) is still greater than the coil flux due to the coil (120). However, compared to the case of Fig. 17e, since the current flowing through the coil (120) has increased, the intensity of the coil flux due to the coil (120) has relatively increased, and thus the magnitude of the magnetic flux due to the bias magnet (150) has relatively decreased. Accordingly, it can be seen that the intensity (length of the arrow) of the core flux (175) has decreased compared to the case of Fig. 17e.

[0198] Referring to Fig. 17g, a current of 15.1 A flows through the coil (120), and the magnitude of the coil magnetic flux due to the current flowing through the coil (120) now becomes greater than the magnet magnetic flux. Therefore, the direction of the magnetic flux according to the coil magnetic flux due to the current flowing through the coil (120) becomes the direction of the core magnetic flux (175). The change in the core magnetic flux (175) within the core (100) from Fig. 17f to Fig. 17g corresponds to the B value moving from the fourth quadrant to the first quadrant in the second BH curve (12) of Fig. 4.

[0199] Referring to Fig. 17h, a 20.1 A current flows through the coil (120), and the coil magnetic flux due to the current flowing through the coil (120) becomes the main magnetic flux forming the core magnetic flux (175). It can be seen that the intensity of the core magnetic flux (175) according to Fig. 17h is greater than that of the core magnetic flux (175) according to Fig. 17g. The increase in the intensity of the coil magnetic flux as shown in Fig. 17h corresponds to approaching the saturation region in the first quadrant in the second BH curve (12) of Fig. 4. However, since the bias magnet (150) is applied, even if 20.1 A flows through the coil (120), the core (100) is not saturated.

[0200] FIG. 18 is a graph showing the relationship between current and inductance when a bias magnet according to one embodiment of the present disclosure is applied to a core.

[0201] Referring to FIG. 18, a first inductance graph (1810) showing the inductance of a core without a bias magnet (150) and a second inductance graph (1820) showing the inductance of a core with a bias magnet (150) are compared.

[0202] The inductance of the core without the bias magnet (150) is greater than that of the core with the bias magnet (150) when the current flowing through the coil is approximately 12 A or less. However, when the current flowing through the coil exceeds 12 A, the core without the bias magnet (150) enters the saturation region, and the inductance decreases significantly. In contrast, when the bias magnet (150) is provided, it can be seen that the core maintains an inductance value of 200 uH even when the current flowing through the coil exceeds 12 A and reaches 20 A. Therefore, it can be seen that when the bias magnet (150) is provided, the core does not reach the saturation region compared to the core without the bias magnet (150) even when the current flowing through the coil increases considerably.

[0203] FIG. 19 is a block diagram of a home appliance according to one embodiment of the present disclosure.

[0204] As illustrated in FIG. 19, a home appliance (2000) according to one embodiment of the present disclosure may include a driving unit (2100), a processor (2200), a communication interface (2300), an output interface (2500), a user input interface (2600), and a memory (2700). Not all components of the home appliance (2000) are essential, and each component may be added or subtracted depending on the design concept of the manufacturer.

[0205] Below, we will look at the above components in turn.

[0206] The driving unit (2100) can receive power from an external power source and supply current to a load according to a driving control signal of the processor (2200). The driving unit (2100) can include, but is not limited to, an EMI (Electro Magnetic Interference) filter (2111), a rectifier circuit (2112), an inverter circuit (2113), and a power circuit (3000).

[0207] The EMI filter (2111) blocks high-frequency noise included in AC power supplied from an external power source (ES) and allows AC voltage and AC current of a predetermined frequency (e.g., 50 Hz or 60 Hz) to pass. A fuse and a relay may be provided between the EMI filter (2111) and the external power source (ES) to block overcurrent. The AC power from which high-frequency noise has been blocked by the EMI filter (2111) is supplied to a rectifier circuit (2112).

[0208] The rectifier circuit (2112) may be, for example, a circuit such as the rectifier (20) of FIG. 1A. The rectifier circuit (2112) may convert an alternating current (AC) voltage into a direct current (DC) voltage. For example, the rectifier circuit (2112) may convert an AC voltage whose magnitude and polarity (positive voltage or negative voltage) vary over time into a DC voltage whose magnitude and polarity are constant, and may convert an AC current whose magnitude and direction (positive current or negative current) vary over time into a DC current whose magnitude is constant. The rectifier circuit (2112) may include a bridge diode. For example, the rectifier circuit (2112) may include four diodes. The bridge diodes may convert an input AC voltage whose polarity varies over time into a positive voltage whose polarity is constant, and may convert an input AC current whose direction varies over time into a positive current whose direction is constant. In one embodiment, the rectifier circuit (2112) may include two diodes and two thyristors. One thyristor and one diode can form one commutation leg, and another thyristor and one diode can form another commutation leg. However, this is when the input power is single-phase. If the input power is three-phase, a commutation circuit (2112) including three legs can be formed with three thyristors and three diodes. The processor (2200) can control the thyristors so that the voltage charged to the link capacitor increases gradually rather than abruptly.

[0209] The inverter circuit (2113) may include a switching circuit that supplies or cuts off current to a load (not shown). The switching circuit may include at least two switches. The at least two switches may be connected in series between the positive and negative lines output from the rectifier circuit (2112). The at least two switches may be turned on or off according to a driving control signal of the processor (2200).

[0210] The inverter circuit (2113) can control the current supplied to the load. For example, the magnitude and direction of the current flowing to the load can change depending on the turning on / off of at least two switches included in the inverter circuit (2113). In this case, the load can be supplied with an alternating current (having an alternating voltage of a second voltage level different from the voltage level of the input alternating current voltage). An alternating current in the form of a sinusoid is supplied to the load depending on the switching operation of at least two switches.

[0211] In Fig. 19, since the inverter circuit (2113) may be required when supplying alternating current to the load, the inverter circuit (2113) may not be required in the home appliance (2000) that supplies direct current to the load. In other words, according to one embodiment, the home appliance (2000) may not use the inverter circuit (2113) or may use a power circuit (3000) that completely omits the inverter circuit (2113) - for example, a PFC circuit (30). In this case, the power circuit (3000) may include an inductor (31) through which current flows in one direction, and the inductor (31) may include a PFC circuit (30) that includes a bias magnet (150) that prevents saturation of the inductor (31). The inductor (31) and bias magnet (150) according to one embodiment of the present disclosure are not only used in the PFC circuit (30), but can also be used in various power circuits or power conversion devices, including the SMPS (Switched Mode Power Supply) circuit.

[0212] The processor (2200) can control the overall operation of the home appliance (2000). The processor (2200) can control the communication interface (2300), the output interface (2500), the user input interface (2600), and the memory (2700) by executing programs stored in the memory (2700).

[0213] The processor (2200) may include various processing circuits and / or multiple processors. For example, the term “processor” as used herein, including in the claims, may include various processing circuits, including at least one processor. One or more processors in at least one processor may be configured to perform various functions described herein, individually and / or collectively, in a distributed fashion. As used herein, “processor,” “at least one processor,” and “one or more processors” may be configured to perform various functions. However, these terms encompass, without limitation, situations where one processor performs some of the functions and other processor(s) perform other parts of the functions, and situations where a single processor may perform all of the functions. Furthermore, the at least one processor may include a combination of processors that perform various functions of the disclosed functions in a distributed manner. The at least one processor may execute program instructions to achieve or perform various functions.

[0214] For example, there may be one processor (2200) or multiple processors. The home appliance (2000) may include only a main processor, or may include a main processor and at least one sub-processor.

[0215] According to one embodiment of the present disclosure, the processor (2200) may be equipped with an artificial intelligence (AI) processor. The AI ​​processor may be manufactured in the form of a dedicated hardware chip for artificial intelligence (AI), or may be manufactured as part of an existing general-purpose processor (e.g., CPU or application processor) or a graphics-only processor (e.g., GPU) and equipped in the home appliance (2000).

[0216] According to one embodiment of the present disclosure, the processor (2200) may perform controller operations of a harmonic extractor, a harmonic controller, a current controller, and a voltage controller that may be included in a control unit (not shown) of a home appliance (2000), for example. Here, the controller of the harmonic controller, the current controller, and the voltage controller may be a PI controller, but is not limited thereto.

[0217] The processor (2200) may include a communication interface (2300) to operate on an Internet of Things (IoT) network or a home network as needed.

[0218] The communication interface (2300) may include a short-range wireless communication interface (2310) and a long-range wireless communication interface (2320). The short-range wireless communication interface (2310) may include, but is not limited to, a Bluetooth communication interface, a BLE (Bluetooth Low Energy) communication interface, a near field communication interface, a WLAN (Wi-Fi) communication interface, a Zigbee communication interface, an infrared (IrDA, infrared Data Association) communication interface, a WFD (Wi-Fi Direct) communication interface, an UWB (Ultra Wideband) communication interface, an Ant+ communication interface, etc. The long-range communication interface (2320) transmits and receives a wireless signal with at least one of a base station, an external terminal, and a server on a mobile communication network. Here, the wireless signal may include various types of data according to transmission and reception of a voice call signal, a video call signal, or a text / multimedia message. The remote communication unit (2320) may include, but is not limited to, a 3G module, a 4G module, a 5G module, an LTE module, an NB-IoT module, an LTE-M module, etc.

[0219] According to one embodiment of the present disclosure, communication can be made with a server or other electrical device outside the home appliance (2000) through a communication interface (2300) and data can be transmitted and received.

[0220] The output interface (2500) is for outputting audio signals or video signals and may include a display unit (2510) and an audio output unit (2520).

[0221] According to one embodiment of the present disclosure, the home appliance (2000) can display information related to the home appliance (2000) through the display unit (2510). For example, the home appliance (2000), power factor information of the home appliance (2000) or harmonic component values ​​(e.g., % or A (ampere) of each harmonic component compared to the input current) can be displayed on the display unit (2510).

[0222] When the display unit (2510) and the touchpad are configured as a touch screen in a layered structure, the display unit (2510) can be used as an input device in addition to an output device. The display unit (2510) can include at least one of a liquid crystal display, a thin film transistor-liquid crystal display, a light-emitting diode (LED), an organic light-emitting diode, a flexible display, a 3D display, and an electrophoretic display. In addition, depending on the implementation form of the home appliance (2000), two or more display units (2510) can be included.

[0223] The audio output unit (2520) can output audio data received from the communication interface (2300) or stored in the memory (2700). In addition, the audio output unit (2520) can output audio signals related to functions performed in the home appliance (2000). The audio output unit (2520) can include a speaker, a buzzer, etc.

[0224] According to one embodiment of the present disclosure, the output interface (2500) may display the current power level, operating mode (e.g., low noise mode, normal mode, high power mode, etc.), power factor control status, current power factor, etc.

[0225] The user input interface (2600) is for receiving input from a user. The user input interface (2600) may be at least one of a key pad, a dome switch, a touch pad (contact electrostatic capacitance type, pressure resistive film type, infrared detection type, surface ultrasonic conduction type, integral tension measurement type, piezo effect type, etc.), a jog wheel, and a jog switch, but is not limited thereto.

[0226] The user input interface (2600) may include a voice recognition module. For example, the home appliance (2000) may receive a voice signal, which is an analog signal, through a microphone, and convert the voice portion into computer-readable text using an Automatic Speech Recognition (ASR) model. The home appliance (2000) may interpret the converted text using a Natural Language Understanding (NLU) model to obtain the user's utterance intent. Here, the ASR model or the NLU model may be an artificial intelligence model. The artificial intelligence model may be processed by an artificial intelligence processor designed with a hardware structure specialized for processing artificial intelligence models. The artificial intelligence model may be created through learning. Here, being created through learning means that a basic artificial intelligence model is learned using a plurality of learning data by a learning algorithm, thereby creating a predefined operation rule or artificial intelligence model set to perform a desired characteristic (or purpose). The artificial intelligence model may be composed of multiple neural network layers. Each of the multiple neural network layers has multiple weight values, and performs neural network operations through operations between the operation results of the previous layer and the multiple weight values.

[0227] Linguistic understanding is the technology of recognizing, applying, and processing human language / characters, including natural language processing, machine translation, dialog systems, question answering, and speech recognition / synthesis.

[0228] The memory (2700) may store a program for processing and controlling the processor (2200), and may store input / output data (e.g., power factor information of the home appliance (2000), information on harmonic components, etc.). The memory (2700) may also store an artificial intelligence model.

[0229] The memory (2700) may include at least one type of storage medium among a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (e.g., SD or XD memory, etc.), a RAM (Random Access Memory), a SRAM (Static Random Access Memory), a ROM (Read-Only Memory), an EEPROM (Electrically Erasable Programmable Read-Only Memory), a PROM (Programmable Read-Only Memory), a magnetic memory, a magnetic disk, and an optical disk. In addition, the home appliance (2000) may also operate a web storage or cloud server that performs a storage function on the Internet.

[0230] FIG. 20 illustrates an air conditioner using an inductor according to one embodiment of the present disclosure.

[0231] An air conditioner (5000) according to one embodiment of the present disclosure can absorb heat from an air-conditioned space (hereinafter referred to as "indoor") and release heat from the outside of the air-conditioned space (hereinafter referred to as "outdoor") for cooling the air-conditioned space, which is the target of air conditioning. In addition, the air conditioner (5000) can absorb heat from the outdoors and release heat to the indoors for heating the indoor space.

[0232] An air conditioner (5000) may include one or more outdoor units (5100) installed outdoors and one or more indoor units (5200) installed indoors. The outdoor unit (5100) may be electrically connected to the indoor unit (5200). For example, a user may input information (or commands) for controlling the indoor unit (5200) through a user interface panel (5220), and the outdoor unit (5100) may operate in response to the user input of the indoor unit (5200).

[0233] The outdoor unit (5100) can be fluidly connected to the indoor unit (5200) through a refrigerant pipe.

[0234] The outdoor unit (5100) is installed outdoors. The outdoor unit (5100) can perform heat exchange between the refrigerant and outdoor air by utilizing a phase change of the refrigerant (e.g., evaporation or condensation). This heat exchange can be achieved through an outdoor heat exchanger included in the outdoor unit (5100). For example, while the refrigerant condenses in the outdoor unit (5100), the refrigerant can release heat to the outdoor air. While the refrigerant evaporates in the outdoor unit (5100), the refrigerant can absorb heat from the outdoor air.

[0235] An indoor unit (5200) is installed indoors. The indoor unit (5200) can perform heat exchange between the refrigerant and indoor air by utilizing a phase change of the refrigerant (e.g., evaporation or condensation). At this time, the heat exchange can be performed through an indoor heat exchanger included in the indoor unit (5200). For example, while the refrigerant evaporates in the indoor unit (5200), the refrigerant can absorb heat from the indoor air, thereby cooling the indoor space. While the refrigerant condenses in the indoor unit (5200), the refrigerant can release heat to the indoor air, thereby heating the indoor space. The air conditioner (5000) may include a compressor, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger. The air conditioner (5000) may include a refrigerant pipe connecting the compressor, the outdoor heat exchanger, the expansion device, and the indoor heat exchanger.

[0236] An indoor unit (5200) of an air conditioner (5000) may include a user interface panel (5220) that displays operation information of the air conditioner (5000) and can receive commands from a user. A display unit of the user interface panel (5220) may receive information regarding the operation of the air conditioner (5000) from a processor that controls the operation of the air conditioner (5000) and display information corresponding to the received information. The display unit may include an indicator that displays the operation type of the air conditioner (5000) selected by the user or whether the power of the indoor unit (5200) is on / off. The indicator may include, for example, a liquid crystal display (LCD) panel, a light emitting diode (LED) panel, or a plurality of LEDs.

[0237] The outdoor unit (5100) includes an outdoor unit body (5101) forming the exterior of the outdoor unit (5100), and an outdoor unit fan (5102) provided on one side of the outdoor unit body (5101) to discharge heat-exchanged air.

[0238] The indoor unit (5200) may include an indoor unit body (5201) forming the exterior of the indoor unit (5200), an indoor unit discharge port (5202) provided on the front of the indoor unit body (5201) for discharging heat-exchanged air, and a user interface panel (5220) for receiving operation commands for the air conditioner (5000) from a user.

[0239] An air conditioner (5000) according to FIG. 20 may include a power circuit (3000) including a circuit such as an SMPS or PFC circuit including an inductor having a bias magnet (150) according to one embodiment of the present disclosure.

[0240] FIG. 21 illustrates a refrigerator using an inductor according to one embodiment of the present disclosure.

[0241] Referring to FIG. 21, a refrigerator (6000) according to one embodiment of the present disclosure may include an inductor equipped with a bias magnet (150). The inductor may be included in a power circuit (3000) including an SMPS or PFC circuit. The refrigerator (6000) may include a main body (6010). The main body (6010) may include an inner case, an outer case disposed outside the inner case, and an insulating material provided between the inner cases and the outer cases.

[0242] The "inner case" may include a case, plate, panel, or liner forming a storage compartment. The inner case may be formed as a single body or may be formed by assembling multiple plates. The "outer case" may form the outer appearance of the main body and may be joined to the outer surface of the inner case so that insulation is placed between the inner case and the outer case.

[0243] "Insulation" can insulate the interior and exterior of a storage room so that the temperature inside the storage room can be maintained at a set temperature without being affected by the external environment of the storage room. In one embodiment, the insulation can include foam insulation. The foam insulation can be formed by injecting and foaming urethane foam, a mixture of polyurethane and a foaming agent, between the inner and outer layers after securing them with a jig or the like.

[0244] In one embodiment, the insulation may include a vacuum insulation in addition to the foam insulation, or the insulation may consist solely of the vacuum insulation instead of the foam insulation. The vacuum insulation may include a core material and an outer shell material that accommodates the core material and seals the interior at a vacuum or near-vacuum pressure. The vacuum insulation may further include an adsorbent that adsorbs gases and moisture to stably maintain a vacuum state. However, the insulation is not limited to the foam insulation or vacuum insulation described above, and may include various materials that can be used for insulation.

[0245] A refrigerator (6000) according to one embodiment of the present disclosure may include a cold air supply device configured to supply cold air to a storage compartment.

[0246] A "refrigeration supply device" may include a system comprising a machine, mechanism, electronic device and / or a combination thereof that can generate and guide cold air to cool a storage room.

[0247] In one embodiment, a refrigeration supply device can generate refrigeration through a refrigeration cycle that includes the processes of compression, condensation, expansion, and evaporation of a refrigerant. To this end, the refrigeration supply device can include a compressor, a condenser, an expansion device, and an evaporator capable of driving the refrigeration cycle.

[0248] A refrigerator (6000) according to one embodiment of the present disclosure may include a machine room in which at least some components belonging to a cold air supply device are arranged.

[0249] The "machine room" may be designed to be partitioned and insulated from the storage room to prevent heat generated by components placed within the machine room from being transferred to the storage room. The interior of the machine room may be configured to be in communication with the exterior of the main body to dissipate heat from components placed within the machine room.

[0250] A refrigerator (6000) is a type of home appliance that supplies cold air generated by a compressor in a refrigeration supply unit to a storage compartment, allowing various foods to remain fresh for long periods of time. In addition to this long-term preservation function, the refrigerator (6000) is equipped with various additional functions. Representative functions include a communication function that enables the establishment of an IoT network and a function that outputs sound via speakers built into the refrigerator (6000).

[0251] Referring to FIG. 21, another refrigerator (6000) according to one embodiment of the present disclosure may include a main body (6010) and doors (6030a, 6030b, 6030c, 6030d) that can open and close a storage compartment.

[0252] A refrigerator (6000) according to one embodiment of the present disclosure may include a door (6030) configured to open and close an open side of a storage compartment.

[0253] The refrigerator (6000) according to FIG. 21 is illustrated with four doors (6030), but the number of doors (6030) is not limited thereto. The upper door (6030a) and the lower door (6030b) on the right side of the refrigerator (6000) may be configured as one door, and the upper door (6030c) and the lower door (6030d) on the left side of the refrigerator (6000) may be configured as one door. In addition, the number of doors of the refrigerator (6000) may be more or less than four. In addition, the positions of the doors (6030) may also be varied. Depending on the arrangement of the doors (6030) and the storage compartment, the refrigerator (6000) may be a French door type refrigerator, a side-by-side type refrigerator, etc. Between the plurality of doors (6030a, 6030b, 6030c, 6030d), there may be a handle area, which is a space where a user can insert a hand to open and close the door (6030).

[0254] The door (6030) may be configured to seal the storage compartment when the door (6030) is closed. The door (6030) may include insulation, similar to the body (6010), to insulate the storage compartment when the door (6030) is closed.

[0255] A refrigerator (6000) according to one embodiment may include a user interface panel (6220) on a door (6030). The user interface panel (6220) may be located on any one of the doors (6030a, 6030b, 6030c, 6030d).

[0256] FIG. 22 illustrates a washing machine using an inductor according to one embodiment of the present disclosure.

[0257] The washing machine (7000) according to FIG. 22 may include an inductor having a bias magnet (150). The inductor may be included in an SMPS or PFC circuit (30), and the washing machine (7000) may include such an SMPS or PFC circuit (30).

[0258] A washing machine (7000) may include a main body (7010), a water tank (not shown) installed inside the main body (7010), and a drum (7011) installed inside the water tank. A lifter (7012) may be installed inside the drum (7011) to lift laundry upward while the drum (7011) rotates and then drop it by gravity. The drum (7011) may perform washing, rinsing, and / or dehydration while rotating inside a tub described below. The drum (7011) may include a hole connecting the internal space of the drum (7011) and the internal space of the tub. The drum (7011) may have a generally cylindrical shape with one end open.

[0259] The main body (7010) of the washing machine (7000) may generally have a hexahedral shape, but is not limited thereto. An opening (7013) may be formed at the front center of the main body (7010) through which laundry may be placed or removed from the drum (7011), and a door (7014) for opening and closing the opening (7013) may be rotatably installed. At least a portion of the door (7014) may be transparent or translucent so that the interior surrounding the drum (7011) may be visible.

[0260] Although not illustrated in FIG. 22, the washing machine (7000) may include a tub provided inside the water tank to store water. The tub may be supported inside the water tank. The tub may have a generally cylindrical shape with one end open. The tub may be elastically supported from the water tank by a damper. The damper may connect the water tank and the tub. The damper may be provided to absorb vibration energy between the tub and the water tank when vibration generated when the drum (7011) rotates is transmitted to the tub and / or the water tank, thereby attenuating the vibration.

[0261] A user interface panel (7220) may be installed on the front upper side of the main body (7010) to display the operating status of the washing machine (7000) to the user or to enable the user to directly control the washing operation. The user interface panel (7220) may include an input unit as an input interface for receiving operation commands from the user and a display unit as an output interface for displaying operation information of the washing machine.

[0262] The input unit can provide an electrical output signal corresponding to a user input to a control unit (not shown) including a processor. The input unit can include, for example, a power button, an operation button, a course selection dial (or a course selection button), and a wash / rinse / spin setting button. The input button of the input unit can include, for example, a tact switch, a push switch, a slide switch, a toggle switch, a micro switch, or a touch switch.

[0263] The display unit can receive a signal from the processor and display information corresponding to the received signal. The display unit can include a screen that displays a washing course selected by rotating the course selection dial (or pressing the course selection button) and the operating time of the washing machine, and an indicator that displays a washing setting / rinse setting / spin setting selected by the setting button. The display unit can include, for example, a liquid crystal display (LCD) panel, a light emitting diode (LED) panel, or the like.

[0264] Although not shown in FIG. 22, the washing machine (7000) may include a drive device configured to rotate the drum (7011).

[0265] A driving device (not shown) may include a driving motor and a rotating shaft (not shown) for transmitting driving force generated by the driving motor to the drum (7011). The rotating shaft may pass through the tub and be connected to the drum (7011). The driving device may be arranged to rotate the drum (7011) forward or backward to perform washing, rinsing, and / or dehydration operations.

[0266] A water supply device (not shown) can supply water to the tub. The water supply device can include a water supply pipe and a water supply valve provided on the water supply pipe. The water supply pipe can be connected to an external water source. The water supply pipe can extend from the external water source to the detergent supply device and / or the tub. Water can be supplied to the tub via the detergent supply device. Water can be supplied to the tub without passing through the detergent supply device.

[0267] A water supply valve (not shown) can open or close the water supply line in response to an electrical signal from the processor. The water supply valve can allow or block the supply of water to the tub from an external water source. The water supply valve may include, for example, a solenoid valve that opens and closes in response to an electrical signal.

[0268] The washing machine (7000) may include a detergent supply device (not shown) configured to supply detergent to the tub. The detergent supply device may be configured to supply detergent into the tub during the water supply process. Water supplied through the water supply pipe may be mixed with detergent via the detergent supply device. The water mixed with detergent may be supplied into the tub. The detergent may include not only laundry detergent but also a dryer rinse, a deodorizer, a sterilizer, or an air freshener.

[0269] The washing machine (7000) may include a drainage device (not shown). The drainage device may be configured to discharge water contained in the tub to the outside. The drainage device may include a drainage pipe extending from the bottom of the tub to the outside of the housing, and a pump provided on the drainage pipe. The pump may pump water in the drainage pipe to the outside of the tank.

[0270] A drain hole (not shown) may be formed at the bottom of the tub to drain water stored in the tub to the outside of the tub. The drain hole may be connected to a drain pipe. The drain pipe may be provided with a drain valve to open and close the drain pipe.

[0271] A control unit including a processor can control various components of a washing machine (e.g., a drive motor, a water inlet valve). The control unit can control various components of the washing machine to perform at least one operation, including water supply, washing, rinsing, and / or spin-drying, according to user input inputted to a control panel. For example, the control unit can control the drive motor to adjust the rotation speed of a tub, or control the water inlet valve of a water supply device to supply water to the tub.

[0272] The control unit may include hardware such as a CPU or memory, and software such as a control program. For example, the control unit may include an algorithm for controlling the operation of components within the washing machine, at least one memory storing program-type data, and at least one processor performing the aforementioned operation using data stored in the at least one memory. The memory and the processor may each be implemented as separate chips. The processor may include one or more processor chips or one or more processing cores. The memory may include one or more memory chips or one or more memory blocks. Additionally, the memory and the processor may be implemented as a single chip.

[0273] A front loading washing machine (7000) according to Fig. 22 can wash laundry by rotating the drum (7011) to repeatedly raise and lower the laundry.

[0274] FIG. 23 illustrates an induction heating device using an inductor according to one embodiment of the present disclosure.

[0275] Referring to FIG. 23, an induction heating device (8000) as a home appliance according to one embodiment of the present disclosure may include an SMPS, and the SMPS may include an inductor equipped with a bias magnet (150).

[0276] The induction heating device (8000) may include multiple cooking zones (8201, 8202, 8203, 8204).

[0277] The cooking vessel (8100) may be a device for heating the contents within the cooking vessel (8100). The cooking vessel (8100) may be powered wirelessly from an induction heating device (8000) using electromagnetic induction. Accordingly, the cooking vessel (8100) according to one embodiment of the present disclosure may not include a power cord connected to a power outlet.

[0278] According to one embodiment of the present disclosure, the type of cooking vessel (8100) that wirelessly receives power from the induction heating device (8000) may vary. The cooking vessel (8100) may be a general induction heating (IH) vessel (hereinafter, IH vessel) containing a magnetic material.

[0279] An induction heating device (8000) according to one embodiment of the present disclosure may be a device that wirelessly transmits power to a cooking vessel (8100) positioned on a top plate of the induction heating device (8000) using electromagnetic induction. The induction heating device (8000) may include a working coil that generates a magnetic field for inductively heating the cooking vessel (8100). The working coil is a coil that forms a magnetic field through an electric current, and may be referred to as a heating coil throughout the present disclosure.

[0280] Generating a magnetic field by a heating coil may include transmitting power by utilizing a magnetic field induced in an IH metal (e.g., iron) through magnetic induction. For example, an induction heating device (8000) may generate eddy currents in a cooking vessel (8100) by flowing a current through the heating coil to form a magnetic field.

[0281] According to one embodiment of the present disclosure, the induction heating device (8000) may include a plurality of heating coils. For example, if the top plate of the induction heating device (8000) includes a plurality of cooking zones, the induction heating device (8000) may include a plurality of heating coils corresponding to each of the plurality of cooking zones.

[0282] The top plate of the induction heating device (8000) according to one embodiment of the present disclosure may be made of reinforced glass such as ceramic glass so as not to be easily broken.

[0283] According to one embodiment of the present disclosure, the induction heating device (8000) may include a communication interface for communicating with an external device. For example, the induction heating device (8000) may communicate with a cooking vessel (8100) or a server through the communication interface. The communication interface may include a short-range communication unit (e.g., an NFC communication unit, a Bluetooth communication unit, a BLE communication unit, etc.), a mobile communication unit, etc.

[0284] According to one embodiment of the present disclosure, an induction heating device (8000) can display various information and receive user commands through a user interface (8015). The user interface (8015) may include an input unit as an input interface for receiving operation commands from a user and a display unit as an output interface for displaying operation information of the induction heating device (8000). As an input interface, the input unit may include a touch key that operates by touch.

[0285] The input unit can provide an electrical output signal corresponding to a user input to a control unit (not shown) including a processor. The input unit can include, for example, input buttons, a power button, an operation button, and a heating stage setting button.

[0286] The display unit can receive a signal from the processor and display information corresponding to the received signal. The display unit can include a display (8400) that displays a heating stage. The display unit can include, for example, a liquid crystal display (LCD) panel, a light emitting diode (LED) panel, or the like.

[0287] According to one embodiment of the present disclosure, a home appliance including an inductor including a bias magnet is disclosed. In one embodiment, the home appliance may include a rectifier circuit for rectifying an AC voltage of an input power source, a PFC circuit for improving a power factor of the voltage rectified by the rectifier circuit, and a link capacitor connected to the PFC circuit for smoothing a DC voltage. In one embodiment, the home appliance may include a PFC circuit, and the PFC circuit may include an inductor. In one embodiment, the home appliance may include an SMPS including an inductor instead of the PFC circuit. In one embodiment, the home appliance may include a power conversion device including an inductor instead of the PFC circuit.

[0288] In one embodiment, an inductor included in a PFC circuit, an SMPS, and / or a power converter may include a core including an air gap in a first group. In one embodiment, the inductor may include a coil wound around at least a portion of the core such that magnetic flux flows in the first group. In one embodiment, the inductor may include an upper magnet disposed above the air gap in the first group. In one embodiment, the inductor may include a lower magnet disposed below the air gap in the first group. In one embodiment, in the inductor, a direction of magnetic flux by the coil and directions of magnetic flux by the upper magnet and the lower magnet are opposite to each other. In one embodiment, the inductor may include only one of the upper magnet or the lower magnet when the upper magnet or the lower magnet includes an electromagnet coil having a coil wound thereon.

[0289] In an inductor according to one embodiment of the present disclosure, the polarity arrangements of the upper magnet and the lower magnet are opposite to each other.

[0290] In an inductor according to one embodiment of the present disclosure, the first group may be a middle group of the core.

[0291] In an inductor according to one embodiment of the present disclosure, the coil may be wound around the first group.

[0292] In an inductor according to one embodiment of the present disclosure, the first group is a group on both sides of the core.

[0293] In an inductor according to one embodiment of the present disclosure, each of the upper magnets arranged on both side groups of the core has poles arranged opposite to each other.

[0294] In an inductor according to one embodiment of the present disclosure, there may be no air gap in the middle of the core.

[0295] In an inductor according to one embodiment of the present disclosure, the coil may be wound around the intermediate member.

[0296] An inductor according to one embodiment of the present disclosure is a square core, and the coil can be wound around a second group opposite to the first group.

[0297] In an inductor according to one embodiment of the present disclosure, the upper magnet may be disposed on the outside of the first group in the core center, and the lower magnet may be disposed on the inside of the first group, or the upper magnet may be disposed on the inside of the first group in the core center, and the lower magnet may be disposed on the outside of the first group.

[0298] In an inductor according to one embodiment of the present disclosure, the upper magnet and the lower magnet can surround at least a portion of the periphery of the first group.

[0299] In an inductor according to one embodiment of the present disclosure, the upper magnet and the lower magnet can surround at least a portion of the periphery of the first group in a circular or square shape.

[0300] In an inductor according to one embodiment of the present disclosure, when the upper magnet and the lower magnet surround at least a portion of the perimeter of the first group in a square shape, the upper magnet and the lower magnet may be attached to at least a portion of four sides of the square.

[0301] In an inductor according to one embodiment of the present disclosure, the N pole and the S pole of the upper magnet and the lower magnet may be arranged in the horizontal direction of the first group.

[0302] In an inductor according to one embodiment of the present disclosure, the N pole and the S pole of the upper magnet and the lower magnet may be arranged in a vertical direction of the first group.

[0303] In an inductor according to one embodiment of the present disclosure, the upper magnet and the lower magnet may be permanent magnets.

[0304] In an inductor according to one embodiment of the present disclosure, at least one of the upper magnet and the lower magnet may be an electromagnet formed by winding an electromagnet coil, and only one of the upper magnet and the lower magnet may be used as a bias magnet.

[0305] In one embodiment of the present disclosure, the home appliance may be at least one of an air conditioner, a refrigerator, and a washing machine, and the load connected to the PFC circuit or power conversion device may be a motor. In one embodiment, the load may be an energy storage device or a battery rather than a motor.

[0306] An inductor according to one embodiment of the present disclosure includes a bobbin coupled to the core, wherein the bobbin may include a space for supporting the upper magnet and the lower magnet.

[0307] An electrical appliance according to one embodiment of the present disclosure may include a core including an air gap in a first group. In one embodiment, the appliance may include a coil wound around at least a portion of the core such that magnetic flux flows in the first group. In one embodiment, the appliance may include a bias magnet disposed in at least one of the air gap cross-sections, the bias magnet having a size smaller than a width of an air gap cross-section and a height smaller than a gap height of the air gap in the first group. In one embodiment, the appliance may include an inductor in which the bias magnet is positioned at the center of the air gap cross-section, and the direction of magnetic flux by the coil and the direction of magnetic flux by the bias magnet are opposite to each other.

[0308] An appliance according to one embodiment of the present disclosure may include an inductor. The inductor according to one embodiment of the present disclosure may include a core including an air gap in a first group, and a coil wound around at least a portion of the core such that magnetic flux flows in the first group. The inductor according to one embodiment of the present disclosure may include an upper magnet disposed above the air gap in the first group, and a lower magnet disposed below the air gap in the first group. In one embodiment, if the upper magnet or the lower magnet is an electromagnet by a coil, only one of the upper magnet or the lower magnet may be used. In the inductor according to one embodiment of the present disclosure, the direction of the magnetic flux by the coil and the directions of the magnetic flux by the upper magnet and the lower magnet are opposite to each other.

[0309] A method according to an embodiment of the present disclosure may be implemented in the form of program commands that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program commands, data files, data structures, etc., alone or in combination. The program commands recorded on the medium may be those specially designed and configured for the present disclosure or may be those known and available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, and hardware devices specially configured to store and execute program commands, such as ROMs, RAMs, and flash memories. Examples of program commands include not only machine language codes generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter, etc.

[0310] Some embodiments of the present disclosure may also be implemented in the form of a recording medium containing computer-executable instructions, such as program modules, executed by a computer. Computer-readable media may be any available media that can be accessed by a computer, and include both volatile and nonvolatile media, removable and non-removable media. Furthermore, computer-readable media may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information, such as computer-readable instructions, data structures, program modules, or other data. Communication media typically includes computer-readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave, or other transport mechanism, and includes any information delivery media. Furthermore, some embodiments of the present disclosure may also be implemented as a computer program or computer program product containing computer-executable instructions, such as a computer program that is executed by a computer.

[0311] 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.

[0312] According to one embodiment, the method according to various embodiments disclosed in the present 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) through an application 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.

Claims

1. A rectifier circuit that rectifies the AC voltage of the input power supply; A power circuit for improving the power factor of the voltage rectified by the above rectifier circuit; and A link capacitor connected to the above power circuit and smoothing the DC voltage, The above power circuit includes an inductor, and the inductor comprises: A core containing an air gap in the first group, A coil wound around at least a portion of the core so that magnetic flux flows in the first group, An upper magnet disposed on the upper side of the air gap in the first group, and A home appliance including a lower magnet disposed at the lower portion of the air gap in the first group, wherein the magnetic flux direction by the coil and the magnetic flux direction by the upper magnet and the lower magnet are opposite to each other.

2. In paragraph 1, A home appliance in which the polarity arrangements of the upper magnet and the lower magnet are opposite to each other.

3. In any one of paragraphs 1 to 2, A home appliance, wherein the power circuit includes at least one of a PFC circuit, an SMPS, and a power conversion device including an inverter.

4. In any one of paragraphs 1 to 3, The above first group is the middle group of the above core, A home appliance in which the above coil is wound around the first group.

5. In any one of paragraphs 1 to 3, The above first group is a home appliance, which is a group on both sides of the core.

6. In paragraph 5, A home appliance in which each of the upper magnets arranged on both sides of the core have opposite poles.

7. In any one of paragraphs 5 to 6, A home appliance having no air gap in the middle of the above core.

8. In any one of paragraphs 5 to 7, A home appliance in which the coil is wound around the middle leg.

9. In any one of paragraphs 1 to 2, The above coil is wound around the second group opposite the first group, and is a home appliance.

10. In paragraph 9, The upper magnet is disposed on the outer side of the first group from the center of the core, and the lower magnet is disposed on the inner side of the first group, or A home appliance, wherein the upper magnet is disposed on the inner side of the first group in the center of the core, and the lower magnet is disposed on the outer side of the first group.

11. In any one of paragraphs 1 to 10, A home appliance, wherein the upper magnet and the lower magnet surround at least a portion of the circumference of the first group.

12. In any one of paragraphs 1 to 11, A home appliance in which the upper magnet and the lower magnet surround at least a portion of the circumference of the first group in a circular or square shape.

13. In paragraph 12, A home appliance, wherein when the upper magnet and the lower magnet surround at least a portion of the perimeter of the first group in a square shape, the upper magnet and the lower magnet are attached to at least a portion of four sides of the square.

14. In any one of paragraphs 1 to 13, A home appliance in which the N pole and the S pole of the upper magnet and the lower magnet are arranged in the horizontal direction of the first group or in the vertical direction of the first group.

15. In any one of paragraphs 1 to 14, The above inductor includes a bobbin coupled to the core, A home appliance, wherein the bobbin includes a space for supporting the upper magnet and the lower magnet.

Images