Transformer for vehicle

Abstract

A transformer for a vehicle, according to a disclosed embodiment of the present invention, comprises: a bobbin unit on which components are wound or which covers at least a part of the components; a coil unit wound on at least one outer circumferential surface of the bobbin unit; and a pair of bus bar units of which at least a part is covered by the bobbin unit and which are arranged to face each other on both sides with respect to the coil unit, wherein at least a part of the bobbin unit includes at least one heat dissipation hole.

Description

Automotive transformer

[0001] The present invention relates to a transformer for a vehicle, and more particularly, to a transformer for a vehicle for an LDC (Low voltage DC-DC Converter) with improved heat dissipation performance applied to an eco-friendly vehicle.

[0002] In the mobility sector, hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), electric vehicles (EVs), and fuel cell electric vehicles (FCEVs) are attracting attention as future eco-friendly vehicles that will replace fossil fuel-powered vehicles.

[0003] Various types of power conversion devices are used in electric vehicles, which are currently being actively commercialized. For example, an on-board charger (OBC) can be used to charge a high-voltage battery from an external source. Another example is a low-voltage DC-DC converter (LDC) to convert power from a high-voltage battery to a low-voltage battery (e.g., a 12V low-voltage battery).

[0004] Currently, eco-friendly vehicles are being developed and implemented with integrated charging systems capable of charging both the vehicle's built-in high-voltage battery and auxiliary battery, known as the Integrated Charging Control Unit (ICCU). The emergence of these integrated charging systems enables bidirectional power conversion, unlike previous technologies that only allowed one-way charging.

[0005] However, vehicle transformers used in LDCs generate heat due to power loss during the power conversion process. In particular, electric vehicles, a type of eco-friendly vehicle, can be charged at high speeds according to user demand. However, during high-speed charging, the large capacity and high output of the LDC can increase the heat generation and temperature.

[0006] Thus, heat generated during the charging process (or power conversion process) can negatively impact the power conversion performance of the vehicle transformer, potentially leading to its failure in the long term. Therefore, it is crucial to quickly dissipate the heat generated within the vehicle transformer to the outside.

[0007] In the past, various methods were devised to control the heat generation of the core penetrating the center of a vehicle transformer. However, during the power conversion process of a vehicle transformer, heat is generated not only in the core but also in the coil being wound, so heat dissipation of the entire components must be resolved.

[0008] In order to solve the above-mentioned problem, the disclosed embodiment of the present invention provides a vehicle transformer capable of efficiently dissipating heat generated inside the vehicle transformer to the outside.

[0009] The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

[0010] In order to solve the above-mentioned problem, a vehicle transformer according to a disclosed embodiment of the present invention includes a bobbin unit on which components are wound or which covers at least a portion of the components, a coil unit wound on at least one outer surface of the bobbin unit, and a pair of busbar units which are at least partially covered by the bobbin unit and are arranged oppositely on both sides of the coil unit, wherein at least some of the bobbin units may include at least one heat dissipation hole.

[0011] In addition, the bobbin unit may include a first bobbin unit disposed on one side of the coil unit, a second bobbin unit on which the coil unit is wound on at least a portion of the outer surface, and a third bobbin unit disposed on the other side of the coil unit opposite the first bobbin unit.

[0012] Additionally, each of the first bobbin unit, the second bobbin unit, and the third bobbin unit may have a central through hole of a concentric structure.

[0013] In addition, at least one of the first bobbin unit, the second bobbin unit, and the third bobbin unit includes at least one heat dissipation hole, and the heat dissipation hole may be formed on one radial side based on the central through hole of the first bobbin unit, the second bobbin unit, and the third bobbin unit.

[0014] In addition, the first bobbin unit has a first central through hole formed in a circular shape with a predetermined first diameter based on a first central axis, and has at least one first heat dissipation hole formed in a predetermined first area based on an axis parallel to the first central axis on the outer side of a first central ring forming an outer circumferential surface of the first central through hole, and the first bobbin unit can form at least one first rib by the at least one first heat dissipation hole.

[0015] In addition, the second bobbin unit has a second central through hole formed in a circular shape with a predetermined second diameter based on the second central axis, forms an outer circumferential surface of the second central through hole, and has at least one second heat dissipation hole formed in a predetermined second area based on an axis parallel to the second central axis on the outer side of the second central ring between which the coil unit is wound, and the second bobbin unit can form a heat dissipation opening by the at least one second heat dissipation hole.

[0016] In addition, the third bobbin unit has a third central through hole formed in a circular shape with a predetermined third diameter based on a third central axis, and has at least one third heat dissipation hole formed with a predetermined third area based on an axis parallel to the third central axis on the outside of a third central ring forming an outer circumferential surface of the third central through hole, and the third bobbin unit can form at least one third rib by the at least one third heat dissipation hole.

[0017] Additionally, the at least one heat dissipation hole formed in at least one of the first bobbin unit and the third bobbin unit may be formed to penetrate in an arc shape based on the central through hole of the first bobbin unit and the third bobbin unit.

[0018] Additionally, a plurality of heat dissipation holes formed in at least two of the first bobbin unit, the second bobbin unit, and the third bobbin unit may have shapes that correspond to each other.

[0019] In addition, the vehicle transformer according to the disclosed embodiment of the present invention may further include a heat dissipation means inserted into at least one heat dissipation hole and transmitting heat generated from the coil unit in at least one direction among the axial direction and the radial direction.

[0020] Additionally, the heat dissipation means may include a gap filler applied in the form of a gel to fill at least one heat dissipation hole.

[0021] Additionally, the heat dissipation means may include a thermal pad having a shape corresponding to at least one heat dissipation hole.

[0022] In addition, the heat dissipation means forms a plurality of layers including a first heat dissipation layer and a second heat dissipation layer, the first heat dissipation layer includes a gap filler applied in a gel form to fill the at least one heat dissipation hole with a first thickness, the second heat dissipation layer includes a thermal pad having a shape corresponding to the at least one heat dissipation hole and occupying the at least one heat dissipation hole with a second thickness, and heat generated from the coil unit can be sequentially transferred through the first heat dissipation layer and the second heat dissipation layer.

[0023] According to the proposed embodiment, the vehicle transformer according to the disclosed embodiment of the present invention includes at least one heat dissipation hole in the bobbin unit, so that it has an advantage in that heat generated from the coil unit can be easily dissipated to the outside compared to the prior art that uses a bobbin unit without a heat dissipation hole.

[0024] In addition, the vehicle transformer according to the disclosed embodiment of the present invention has an advantage in that the heat dissipation performance can be improved while the size of the vehicle transformer is reduced by at least one heat dissipation hole formed through one side of the central through hole of at least a portion of the bobbin unit.

[0025] In addition, the vehicle transformer according to the disclosed embodiment of the present invention has an advantage in that it can effectively dissipate heat generated while safely protecting components covered by the bobbin unit by having a plurality of heat dissipation holes having shapes corresponding to each other.

[0026] In addition, in the vehicle transformer according to the disclosed embodiment of the present invention, there is an advantage in that the heat generated can be effectively dissipated while more safely protecting the parts covered by the bobbin unit through a heat dissipation means formed in at least one heat dissipation hole.

[0027] In addition, in the vehicle transformer according to the disclosed embodiment of the present invention, there is an advantage in that the use of a gap filler as a heat dissipation means improves the adhesion with the heat-generating component, thereby enabling effective heat dissipation.

[0028] In addition, in the vehicle transformer according to the disclosed embodiment of the present invention, there is an advantage in that heat dissipation performance can be secured while safely protecting components built into the bobbin unit by using a thermal pad as a heat dissipation means.

[0029] In addition, in the vehicle transformer according to the disclosed embodiment of the present invention, by including a heat dissipation means including a plurality of layers, there is an advantage in that the adhesion with the heat-generating components built into the bobbin unit can be improved while safely protecting the components built into the bobbin unit.

[0030] FIG. 1 is an exemplary perspective view of a vehicle transformer according to a disclosed embodiment of the present invention.

[0031] Figure 2 is an exploded perspective view of a vehicle transformer according to a disclosed embodiment of the present invention.

[0032] FIG. 3 is a diagram for explaining a first bobbin unit among bobbin units, which are one component of a vehicle transformer according to a disclosed embodiment of the present invention.

[0033] FIG. 4 is a diagram for explaining a second bobbin unit among bobbin units, which are one component of a vehicle transformer according to a disclosed embodiment of the present invention.

[0034] FIG. 5 is for explaining a third bobbin unit among bobbin units, which are one component of a vehicle transformer according to a disclosed embodiment of the present invention.

[0035] FIG. 6 is a cross-sectional view of one side of a vehicle transformer according to a disclosed embodiment of the present invention.

[0036] [Explanation of symbols]

[0037] 1: Automotive transformer

[0038] 100: Bobbin unit 300: Coil unit

[0039] 500: A pair of busbar units 700: Core unit

[0040] 1000: Heat dissipation means

[0041] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided solely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined solely by the scope of the claims.

[0042] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, it should be understood that the "first" component referred to below may also be a "second" component within the technical scope of the present invention.

[0043] Identical reference numerals throughout the specification refer to identical components.

[0044] The individual features of the various embodiments of the present invention can be partially or wholly combined or combined with each other, and as can be fully understood by those skilled in the art, various technical connections and operations are possible, and each embodiment can be implemented independently of each other or can be implemented together in a related relationship.

[0045] Meanwhile, the tentative effects that can be expected by the technical features of the present invention that are not specifically mentioned in the specification of the present invention are treated as described in the specification, and the present embodiment is provided to more completely explain the present invention to a person having average knowledge in the art, and the contents shown in the drawings may be expressed exaggeratedly compared to the actual implementation of the invention, and a detailed description of a configuration that is judged to unnecessarily obscure the gist of the present invention is omitted or briefly described.

[0046] Hereinafter, the disclosed embodiments of the present invention will be described in detail with reference to the attached drawings.

[0047]

[0048] FIG. 1 is an exemplary perspective view of a vehicle transformer (1) according to a disclosed embodiment of the present invention.

[0049] Referring to FIG. 1, a vehicle transformer (1) according to the disclosed embodiment of the present invention includes a bobbin unit (100), a coil unit (300), and a pair of busbar units (500).

[0050] The bobbin unit (100) can form the outer periphery of a component when assembling a vehicle transformer (1) according to the disclosed embodiment of the present invention. By forming the outer periphery of a component, the bobbin unit (100) can protect components built into the bobbin unit (100) and can serve to insulate components that are energized (e.g., coil unit (300), a pair of busbar units (500)). That is, the bobbin unit (100) can cover at least a portion of components (e.g., coil unit (300)) around which components (e.g., coil unit (300)) are wound or components (e.g., coil unit (300) and a pair of busbar units (500)).

[0051] In particular, in the vehicle transformer (1) according to the disclosed embodiment of the present invention, at least a portion of the bobbin unit (100) may include at least one heat dissipation hole (not shown). Although not illustrated in detail in FIG. 1, the at least one heat dissipation hole may assist in heat dissipation of the core center into which at least a portion of the core unit (700) is inserted, but may primarily perform heat dissipation of the wound coil unit (300).

[0052] The coil unit (300) can be wound on at least one outer surface of the bobbin unit (100) described above. The coil unit (300) can be wound in a circular shape around the center of the bobbin unit (100), and when current is generated, a magnetic flux is generated due to the wound shape, thereby generating an induced electromotive force. Accordingly, power conversion can be performed. Meanwhile, heat can be generated in the coil unit (300) along with the induced electromotive force generated by the coil unit (300). It is necessary to quickly dissipate the heat generated from the coil unit (300) to the outside, thereby maintaining the performance of the overall vehicle transformer (1) and extending its lifespan.

[0053] A pair of busbar units (500) may serve to supply electric capacity. The pair of busbar units (500) may be at least partially covered by a bobbin unit (100). For example, a central portion (e.g., a circular portion) of each of the pair of busbar units (500) may be built into the bobbin unit (100) by the bobbin unit (100), and an end portion (e.g., a terminal portion) of each of the pair of busbar units (500) may be formed to protrude outward from the bobbin unit (100). The end portion of each of the pair of busbar units (500) may be electrically connected to the outside and may supply electric capacity to a vehicle transformer (1) according to the disclosed embodiment of the present invention. Each of the pair of busbar units (500) may be formed of a copper material in order to supply sufficient electric capacity for performing power conversion, but is not necessarily limited to the material presented herein.

[0054] In addition, a pair of busbar units (500) may be arranged oppositely on both sides of the coil unit (300). That is, one of the pair of busbar units (500) may be arranged on one side of the coil unit (300) (e.g., the upper side of the coil unit (300)), and the other of the pair of busbar units (500) may be arranged on the other side of the coil unit (300) (e.g., the lower side of the coil unit (300)). With this arrangement configuration, the pair of busbar units (500) may provide electric capacity to the vehicle transformer (1) including the coil unit (300).

[0055] In addition, the vehicle transformer (1) according to the disclosed embodiment of the present invention may further include a core unit (700). The core unit (700) may be a magnetic material, and may perform a role of absorbing and forming magnetic flux generated from the coil unit (300) to move the voltage generated from the primary coil to at least one of the secondary busbar units (500) to cause current to flow.

[0056]

[0057] Hereinafter, the detailed configuration of the vehicle transformer (1) according to the disclosed embodiment of the present invention will be described in more detail.

[0058] FIG. 2 is an exploded perspective view of a vehicle transformer (1) according to a disclosed embodiment of the present invention, FIG. 3 is for explaining a first bobbin unit (110) among bobbin units (100) which are one component of a vehicle transformer (1) according to a disclosed embodiment of the present invention, FIG. 4 is for explaining a second bobbin unit (130) among bobbin units (100) which are one component of a vehicle transformer (1) according to a disclosed embodiment of the present invention, and FIG. 5 is for explaining a third bobbin unit (150) among bobbin units (100) which are one component of a vehicle transformer (1) according to a disclosed embodiment of the present invention.

[0059] Referring to FIGS. 2 to 5, a bobbin unit (100), which is one component of a vehicle transformer (1) according to a disclosed embodiment of the present invention, may include a plurality of components. More specifically, the bobbin unit (100) may include a first bobbin unit (110), a second bobbin unit (130), and a third bobbin unit (150). For example, the first bobbin unit (110) may form an upper portion of the bobbin unit (100), the second bobbin unit (130) may form a middle portion of the bobbin unit (100), and the third bobbin unit (150) may form a lower portion of the bobbin unit (150). The first bobbin unit (110), the second bobbin unit (130), and the third bobbin unit (150) may be coupled to each other to cover at least a portion of the components.

[0060] Based on the position of the coil unit (300), the first bobbin unit (110) can be arranged on one side of the coil unit (300), the second bobbin unit (130) can have the coil unit (300) wound on at least a portion of the outer circumferential surface thereof, and the third bobbin unit (150) can be arranged on the other side facing the first bobbin unit (110) based on the coil unit (300). That is, the first bobbin unit (110), the second bobbin unit (130), and the third bobbin unit (150) can be sequentially formed in a stacked manner, and a structure can be formed in which the second bobbin unit (130) is coupled on the third bobbin unit (150), and the first bobbin unit (110) is coupled on the second bobbin unit (130).

[0061] In addition, each of the first bobbin unit (110), the second bobbin unit (130), and the third bobbin unit (150) may have a concentric center through hole (115, 135, 155). For example, the core center (701), which is a part of the core unit (700), may be inserted into the center through hole (115, 135, 155). Accordingly, power conversion of the vehicle transformer (1) is enabled. The center through hole (115, 135, 155) may be formed in a shape corresponding to the radial outer surface (e.g., radial direction in the xy plane) of the core center (701). In general, the core center (701) may have a columnar shape such as a rectangular parallelepiped or a cylinder, and the center through hole (115, 135, 155) may have a concentric structure so that the core center (701) can be easily penetrated.

[0062] In addition, at least one of the first bobbin unit (110), the second bobbin unit (130), and the third bobbin unit (150) may include at least one heat dissipation hole (116, 117, 136, 137, 156, 157). The at least one heat dissipation hole (116, 117, 136, 137, 156, 157) may serve to efficiently dissipate heat generated from the coil unit (300) to the outside. For example, the first bobbin unit (110), the second bobbin unit (130), and the third bobbin unit (150) may all include at least one heat dissipation hole (116, 117, 136, 137, 156, 157). Accordingly, compared to when at least one heat dissipation hole (116, 117, 136, 137, 156, 157) is not formed in the bobbin unit (100), heat generated from the coil unit (300) can be transferred to the outside more quickly and easily, and performance degradation of the vehicle transformer (1) can be prevented.

[0063] More specifically, at least one heat dissipation hole (116, 117, 136, 137, 156, 157) may be formed on one side in the radial direction (e.g., the radial direction in the xy plane) with respect to the central through holes (115, 135, 155) of the first bobbin unit (110), the second bobbin unit (130), and the third bobbin unit (150). In this way, since at least one heat dissipation hole (116, 117, 136, 137, 156, 157) is formed on one side in the radial direction (e.g., the radial direction in the xy plane) based on the central through hole (115, 135, 155), a heat dissipation path is induced in the axial direction (e.g., the z-axis direction) of the first bobbin unit (110), the second bobbin unit (130), and the third bobbin unit (150), and there is an advantage in that effective heat dissipation is possible.

[0064]

[0065] Below, the detailed configuration of the first bobbin unit (110) is described in more detail.

[0066] Referring to FIGS. 2 and 3, a bobbin unit (100), which is one component of a vehicle transformer (1) according to a disclosed embodiment of the present invention, may include a first bobbin unit (110). The first bobbin unit (110) may have a first center through hole (115) formed in a circular shape with a first diameter (D1) penetrating through the first bobbin unit body (111) with a first center axis (e.g., z-axis) as the reference. As described above, the first center through hole (115) may accommodate a core center portion (701), which is one component of a core unit (700). The first diameter (D1) of the first center through hole (115) may be formed to be larger than an outer diameter of the first core center portion (711) so as to accommodate the core center portion (701), particularly the first core center portion (711) of the first core unit (710).

[0067] In addition, the first bobbin unit (110) may include a first center ring (112) formed on the first bobbin unit body (111), and the first center ring (112) may form an outer surface of a first center through hole (115). The first bobbin unit (110) may have at least one first heat dissipation hole (116, 117) on the outer side of the first center ring (112). For example, the first heat dissipation hole (116, 117) may include a first heat dissipation hole (116) on one side and a first heat dissipation hole (117) on the other side, and the first heat dissipation holes (116, 117) may be formed to face each other with respect to the first center through hole (115).

[0068] In addition, at least one first heat dissipation hole (116, 117) may be formed to penetrate a predetermined first area based on an axis parallel to the first central axis. That is, at least one first heat dissipation hole (116, 117) may be formed to penetrate along a direction perpendicular to a surface of the first bobbin unit body (111), thereby forming a heat dissipation path in an axial direction (e.g., z-axis direction). Since an axial heat dissipation path is formed by at least one first heat dissipation hole (116, 117), there is an advantage in that heat generated from the coil unit (300) can be dissipated more efficiently.

[0069] In addition, the first bobbin unit (110) can form at least one first rib (113) by at least one first heat dissipation hole (116, 117). The first rib (113) can form a part of the outer surface of at least one heat dissipation hole (116, 117), and can include a first rib (113a) on one side forming a part of the outer surface of the first heat dissipation hole (116) on one side, and a first rib (113b) on the other side forming a part of the outer surface of the first heat dissipation hole (117) on the other side. In this way, since the first bobbin unit (110) includes the first rib (113), one of the pair of busbar units (500) (e.g., the first busbar unit (510)) arranged at the lower portion of the first bobbin unit (110) can be stably positioned, and the durability and assemblability of the first bobbin unit (110) can be improved.

[0070] Additionally, the first bobbin unit (110) may include a first bobbin unit extension (118) formed to extend a predetermined length in the axial direction (z-axis direction), and a terminal cover portion (119) formed to extend by bending from the first bobbin unit extension (118). For example, the terminal cover portion (119) may include a first terminal cover portion (119a), and a second terminal cover portion (119b) formed to be spaced apart from the first terminal cover portion (119a) at a predetermined distance. At least a portion of the terminal cover portion (119) is formed to have an opening so that at least a portion of the terminal unit (900) is exposed to the outside, and the terminal unit (900) with the exposed portion can be electrically connected to other external components.

[0071] Meanwhile, although not separately illustrated in FIGS. 2 and 3 of the present invention, the first bobbin unit (110) may further include at least one first sub-rib (not illustrated) that defines at least one first heat dissipation hole (116, 117) as needed. By including the first sub-rib, the durability of the first bobbin unit (110) can be improved.

[0072]

[0073] Below, the detailed configuration of the second bobbin unit (130) is described in more detail.

[0074] Referring to FIGS. 2 and 4, a bobbin unit (100), which is one component of a vehicle transformer (1) according to the disclosed embodiment of the present invention, may include a second bobbin unit (130). The second bobbin unit (130) may have a second central through hole (135) formed in a circular shape having a predetermined second diameter (D2) with respect to a second central axis (e.g., z-axis) in a second bobbin unit body (131). As described above, the second central through hole (135) may accommodate a core center portion (701), which is one component of a core unit (700). The second diameter (D2) of the second center through hole (135) may be formed to be larger than the outer diameter of the first core center (711) or the second core center (712) so as to accommodate the core center (701), particularly the first core center (711) of the first core unit (710) or the second core center (721) of the second core unit (720).

[0075] In addition, the second bobbin unit (130) may include a second center ring (132) formed on the second bobbin unit body (131), and the second center ring (132) may form an outer circumferential surface of the second center through hole (135). At this time, the coil unit (300) may be wound on the outer circumferential surface of the second bobbin unit body (131). In order for the coil unit (300) to be stably wound according to the required specifications, the outer diameter of the second bobbin unit body (131) may be formed to a size corresponding to the required specifications of the coil unit (300).

[0076] Meanwhile, the second bobbin unit (130) may include a second center ring (132a) formed on one side (e.g., upper) with respect to the second bobbin unit body (131), and a second center ring (132b) formed on the other side (e.g., lower) with respect to the second bobbin unit body (131). The coil unit (300) may be wound between the second center ring (132a) on one side and the second center ring (132b) on the other side.

[0077] The second bobbin unit (130) may have at least one second heat dissipation hole (136, 137) on the outer side of each of the second center rings (132). For example, the second heat dissipation holes (136, 137) may include a second heat dissipation hole (136) on one side and a second heat dissipation hole (137) on the other side, and the second heat dissipation holes (136, 137) may be formed to face each other with respect to the second center through hole (135).

[0078] Meanwhile, the second bobbin unit (130) may form a heat dissipation opening by at least one second heat dissipation hole (136, 137). Unlike the first bobbin unit (110) and the third bobbin unit (150), the second bobbin unit (130) may not form a separate rib. That is, the second heat dissipation holes (136, 137) may be formed as openings in an axis parallel to the second central axis and in a radial direction (for example, a radial direction in the xy plane). Accordingly, there is an advantage in that the coil unit (300) can be easily wound on one outer surface of the second bobbin unit (130), and heat generated from the coil unit (300) can be easily dissipated to the outside.

[0079] In addition, the second bobbin unit (130) may include a first wing portion (133) and a second wing portion (134) that are formed to protrude radially from a second center ring (132a) on one side and a second center ring (132b) on the other side, respectively. More specifically, the second bobbin unit (130) may include an upper first wing portion (133a) and an upper second wing portion (134a) that are formed to protrude radially from a second center ring (132a) on one side, and may include a lower first wing portion (133b) and a lower second wing portion (134b) that are formed to protrude radially from a second center ring (132b) on the other side. By the first wing portion (133) and the second wing portion (134), the area where the coil unit (300) is wound may be limited, and there is an advantage in that precise assembly of the vehicle transformer (1) is possible.

[0080]

[0081] Below, the detailed configuration of the third bobbin unit (150) is described in more detail.

[0082] Referring to FIGS. 2 and 5, a bobbin unit (100), which is one component of a vehicle transformer (1) according to the disclosed embodiment of the present invention, may include a third bobbin unit (150). The third bobbin unit (150) may have a third central through hole (155) formed in a circular shape with a predetermined third diameter (D3) penetrating through a third bobbin unit body (151) with a third central axis (e.g., z-axis) as the standard. As described above, the third central through hole (155) may accommodate a core center portion (701), which is one component of a core unit (700). The third diameter (D3) of the third central through hole (155) may be formed to be larger than an outer diameter of the second core center portion (721) so as to accommodate the core center portion (701), particularly the second core center portion (721) of the second core unit (720).

[0083] In addition, the third bobbin unit (150) may include a third center ring (152) formed on the third bobbin unit body (151), and the third center ring (152) may form an outer surface of a third center through hole (155). The third bobbin unit (150) may have at least one third heat dissipation hole (156, 157) on the outer side of the third center ring (152). For example, the third heat dissipation hole (156, 157) may include a third heat dissipation hole (156) on one side and a third heat dissipation hole (157) on the other side, and the third heat dissipation holes (156, 157) may be formed to face each other with respect to the third center through hole (155).

[0084] In addition, at least one third heat dissipation hole (156, 157) may be formed to penetrate a predetermined third area based on an axis parallel to the third central axis. That is, at least one third heat dissipation hole (156, 157) may be formed to penetrate along a direction perpendicular to a surface of the third bobbin unit body (151), thereby forming an axial (e.g., z-axis) heat dissipation path. Since an axial heat dissipation path is formed by at least one third heat dissipation hole (156, 157), there is an advantage in that heat generated from the coil unit (300) can be dissipated more efficiently.

[0085] In addition, the third bobbin unit (150) can form at least one third rib by at least one third heat dissipation hole (156, 157). The third rib can form a part of the outer surface of at least one third heat dissipation hole (156, 157), and can include a third rib on one side forming a part of the outer surface of the third heat dissipation hole (156) on one side, and a first rib on the other side forming a part of the outer surface of the third heat dissipation hole (157) on the other side. In this way, since the third bobbin unit (150) includes the third rib, the other one (for example, the second bus bar unit (520)) of the pair of bus bar units (500) arranged on the upper portion of the third bobbin unit (150) can be stably positioned, and the durability and assembling ability of the third bobbin unit (150) can be improved.

[0086] In addition, the third bobbin unit (150) may include a third bobbin unit extension portion (158) formed to extend a predetermined length in the axial direction (z-axis direction) from the outer surface of the third bobbin unit body (151), and a terminal mounting portion (159) formed to extend radially from the third bobbin unit body (151). The third bobbin unit extension portion (158) may cover the entire second bobbin unit (130), the entire coil unit (300), and at least a portion of a pair of busbar units (500), thereby safely protecting the components from the external environment.

[0087] In addition, the terminal mounting portion (159) may include a first terminal mounting portion (159a) and a second terminal mounting portion (159b) formed at a predetermined distance from the first terminal mounting portion (159a). The terminal mounting portion (159) may include a terminal unit receiving groove to support the terminal unit (900), and the terminal unit (900) mounted on the terminal mounting portion (159) may be electrically connected to other external components.

[0088] Meanwhile, although not separately illustrated in FIGS. 2 and 3 of the present invention, the third bobbin unit (150) may further include at least one third sub-rib (not illustrated) that defines at least one third heat dissipation hole (156, 157) as needed. By including the third sub-rib, the durability of the third bobbin unit (150) can be improved.

[0089]

[0090] A pair of busbar units (500) may include a first busbar unit (510) and a second busbar unit (520), and the first busbar unit (510) may be disposed above the coil unit (300), and the second busbar unit (520) may be disposed below the coil unit (300). In addition, each of the pair of busbar units (500) may form busbar center holes (505). For example, the first busbar unit (510) may form a first busbar center hole (515), and the second busbar unit (520) may form a second busbar center hole (525). The first busbar central hole (515) and the second busbar central hole (525) may have a diameter larger than the outer circumference of the core central portion (701) to accommodate the core central portion (701) of the core unit (700).

[0091]

[0092] Below, the coupling relationship and shape relationship between the first bobbin unit (110), the second bobbin unit (130), and the third bobbin unit (150) are described.

[0093] Referring to FIGS. 2 to 5, in the vehicle transformer (1) according to the disclosed embodiment of the present invention, at least one heat dissipation hole (116, 117, 156, 157) formed in at least one of the first bobbin unit (110) and the third bobbin unit (150) may be formed to penetrate in an arc shape based on the central through hole (115, 155) of the first bobbin unit (110) and the third bobbin unit (150). That is, since at least one first heat dissipation hole (116, 117) and at least one third heat dissipation hole (156, 157) have an arc shape, the opened area of ​​the heat dissipation hole is maximized, so that there is an advantage in that the coil unit (300) can be easily transmitted in the axial direction.

[0094] In addition, a plurality of heat dissipation holes (116, 117, 136, 137, 156, 157) formed in at least two of the first bobbin unit (110), the second bobbin unit (130), and the third bobbin unit (150) may have shapes that correspond to each other. For example, the first heat dissipation hole (116, 117) of the first bobbin unit (110), the second heat dissipation hole (136, 137) of the second bobbin unit (130), and the third heat dissipation hole (156, 157) of the third bobbin unit (150) may be formed as openings at positions that correspond in the axial direction. Accordingly, a heat dissipation path that is entirely open in one axial direction is formed, and heat generated from the coil unit (300) can be easily dissipated to the outside.

[0095]

[0096] Meanwhile, a core unit (700), which is a component of a vehicle transformer (1) according to the disclosed embodiment of the present invention, may include a core center (701) and a core side portion (702) formed at a predetermined distance and forming an outer surface of the core unit (700). More specifically, the core side portion (702) may include a first core side portion (712) of a first core unit (710) and a second core side portion (722) of a second core unit (720). The first core side portion (712) and the second core side portion (722) may cover a portion of the outer surface of the bobbin unit (100).

[0097]

[0098] Hereinafter, a heat dissipation means (1000), which is an additional configuration of a vehicle transformer (1) according to the disclosed embodiment of the present invention, will be described in detail.

[0099] Fig. 6 is a cross-sectional view of one side of a vehicle transformer (1) according to a disclosed embodiment of the present invention.

[0100] Referring to FIGS. 1 to 6 as a whole, a vehicle transformer (1) according to the disclosed embodiment of the present invention may further include a heat dissipation means (1000). More specifically, the heat dissipation means (1000) may be inserted and coupled into at least one heat dissipation hole (116, 117, 136, 137, 156, 157). In addition, the heat dissipation means (1000) may transfer heat generated from the coil unit (300) in at least one of an axial direction (e.g., a z-axis direction) and a radial direction (e.g., a radial direction in the xy plane). For example, the heat dissipation means (1000) may be formed between the coil unit (300) and the first busbar unit (510), between the first busbar unit (510) and the first bobbin unit (110), between the coil unit (300) and the second busbar unit (520), and between the second busbar unit (520) and the third bobbin unit (150). The heat dissipation means (1000) may be formed of a material having high thermal conductivity. By inserting the heat dissipation means (1000) into at least one heat dissipation hole (116, 117, 136, 137, 156, 157), heat generated from the coil unit (300) can be transferred and dissipated more quickly through the heat dissipation means (1000).

[0101] For example, the heat dissipation means (1000) may include a gap filler applied in a gel form to fill at least one heat dissipation hole (116, 117, 136, 137, 156, 157). For example, the gel-form gap filler may be thermal grease. By using the gel-form gap filler, the heat dissipation means (1000) is filled between the coil unit (300) and the bobbin unit (100), so that heat generated from the coil unit (300) can be easily dissipated to the outside.

[0102] As another example, the heat dissipation means (1000) may include a thermal pad having a shape corresponding to at least one heat dissipation hole (116, 117, 136, 137, 156, 157). The thermal pad may be formed of a material having high thermal conductivity and elasticity. The thermal pad may fill at least one heat dissipation hole (116, 117, 136, 137, 156, 157) by being compressed and expanded, and the heat dissipation means (1000) may be brought into close contact with the coil unit (300) by the expansion of the thermal pad. Accordingly, the heat dissipation means (1000) may be brought into close contact between the coil unit (300) and the bobbin unit (100) to easily dissipate heat generated from the coil unit (300) to the outside.

[0103] As another example, the heat dissipation means (1000) may form a plurality of layers. For example, the heat dissipation means (1000) may include a first heat dissipation layer and a second heat dissipation layer, and the first heat dissipation layer may include a gap filler that is applied in a gel form and fills at least one heat dissipation hole (116, 117, 136, 137, 156, 157) with a first thickness, and the second heat dissipation layer may include a thermal pad that has a shape corresponding to at least one heat dissipation hole (116, 117, 136, 137, 156, 157) and occupies at least one heat dissipation hole (116, 117, 136, 137, 156, 157) with a second thickness. Comparatively, since the gap filler is in a gel form, it may have a more irregular shape than the thermal pad. Accordingly, the gap filler may be filled to at least a portion of the thickness of the coil unit (300) and the second heat dissipation holes (136, 137), and the first heat dissipation holes (116, 117) and the third heat dissipation holes (156, 157), and the thermal pad may be arranged to the remaining portion of the thickness of the first heat dissipation holes (116, 117) and the third heat dissipation holes (156, 157). By this arrangement shape, heat generated from the coil unit (300) may be sequentially transferred in the vertical direction through the first heat dissipation layer and the second heat dissipation layer. Accordingly, the coil unit (300) and the gap filler are in close contact, and thermal pads having a relatively standardized shape are arranged in the portions facing outward from each of the first heat dissipation holes (116, 117) of the first bobbin unit (110) and the third heat dissipation holes (156, 157) of the third bobbin unit (150), so that heat generated from the coil unit (300) can be easily dissipated to the outside, and there is an advantage in that the inside of the bobbin unit (100) can be safely protected from the external environment.

[0104]

[0105] According to the proposed embodiment, the vehicle transformer (1) according to the disclosed embodiment of the present invention includes at least one heat dissipation hole (116, 117, 136, 137, 156, 157) in the bobbin unit (100), and thus has an advantage in that heat generated from the coil unit (300) can be easily dissipated to the outside compared to the prior art that uses a bobbin unit that does not have a heat dissipation hole (116, 117, 136, 137, 156, 157).

[0106] In addition, the vehicle transformer (1) according to the disclosed embodiment of the present invention has an advantage in that the heat dissipation performance can be improved while the size of the vehicle transformer is reduced by at least one heat dissipation hole (116, 117, 136, 137, 156, 157) formed through one side of at least a part of the central through hole (115, 135, 155) of the bobbin unit (100).

[0107] In addition, the vehicle transformer (1) according to the disclosed embodiment of the present invention has a plurality of heat dissipation holes (116, 117, 136, 137, 156, 157) having mutually corresponding shapes, thereby having the advantage of being able to effectively dissipate heat generated while safely protecting parts covered by the bobbin unit (100).

[0108] In addition, in the vehicle transformer (1) according to the disclosed embodiment of the present invention, there is an advantage in that heat generated can be effectively dissipated while more safely protecting the parts covered by the bobbin unit (100) through a heat dissipation means (1000) formed in at least one heat dissipation hole (116, 117, 136, 137, 156, 157).

[0109] In addition, in the vehicle transformer (1) according to the disclosed embodiment of the present invention, there is an advantage in that the use of a gap filler as a heat dissipation means (1000) improves the adhesion with the heat-generating component, thereby enabling effective heat dissipation.

[0110] In addition, in the vehicle transformer (1) according to the disclosed embodiment of the present invention, there is an advantage in that heat dissipation performance can be secured by using a thermal pad as a heat dissipation means (1000) while safely protecting components built into the bobbin unit.

[0111] In addition, in the vehicle transformer (1) according to the disclosed embodiment of the present invention, by including a heat dissipation means (1000) including a plurality of layers, there is an advantage in that the adhesion with the heat-generating components built into the bobbin unit (100) can be improved while safely protecting the components built into the bobbin unit (100).

[0112] In particular, when a vehicle transformer (1) according to the disclosed embodiment of the present invention is used, the temperature of the coil unit (300) is lowered by about 20°C compared to a vehicle transformer according to the prior art, thereby improving the performance of the vehicle transformer (1).

[0113]

[0114] Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications can be made within the scope of the patent claims, the detailed description of the invention, and the attached drawings, and it is obvious that this also falls within the scope of the present invention.

[0115] The present invention provides a vehicle transformer capable of efficiently dissipating heat generated inside the vehicle transformer to the outside.

Claims

1. In vehicle transformers, A bobbin unit on which parts are wound or covering at least a portion of said parts; A coil unit wound on at least one outer surface of the above bobbin unit; and A pair of busbar units, at least partly covered by the bobbin unit and arranged oppositely on both sides with respect to the coil unit; A vehicle transformer, characterized in that at least some of the above bobbin units include at least one heat dissipation hole.

2. In claim 1, The above bobbin unit, A first bobbin unit arranged on one side of the above coil unit; A second bobbin unit having the coil unit wound on at least a portion of the outer surface; and A vehicle transformer, characterized by including a third bobbin unit disposed on the other side opposite to the first bobbin unit based on the coil unit.

3. In claim 2, A vehicle transformer, characterized in that each of the first bobbin unit, the second bobbin unit, and the third bobbin unit has a concentric central through hole.

4. In claim 2, At least one of the first bobbin unit, the second bobbin unit, and the third bobbin unit includes at least one heat dissipation hole, A vehicle transformer, characterized in that the heat dissipation hole is formed on one radial side based on the central through holes of the first bobbin unit, the second bobbin unit, and the third bobbin unit.

5. In claim 2, The above first bobbin unit, It has a first central through hole formed in a circular shape with a predetermined first diameter based on the first central axis, At least one first heat dissipation hole is formed with a predetermined first area penetration based on an axis parallel to the first central axis on the outer side of the first center ring forming the outer surface of the first center penetration hole, A vehicle transformer, characterized in that the first bobbin unit forms at least one first rib by the at least one first heat dissipation hole.

6. In claim 2, The above second bobbin unit, It has a second central through hole formed in a circular shape with a predetermined second diameter based on the second central axis, The outer surface of the second central through hole is formed, and at least one second heat dissipation hole is formed with a predetermined second area through an axis parallel to the second central axis on the outer side of the second central ring between which the coil unit is wound. A vehicle transformer, characterized in that the second bobbin unit forms a heat dissipation opening by the at least one second heat dissipation hole.

7. In claim 2, The above third bobbin unit, It has a third central through hole formed in a circular shape with a predetermined third diameter based on the third central axis, At least one third heat dissipation hole is formed with a predetermined third area penetration based on an axis parallel to the third central axis on the outer side of the third center ring forming the outer surface of the third center penetration hole, A vehicle transformer, characterized in that the third bobbin unit forms at least one third rib by the at least one third heat dissipation hole.

8. In claim 4, A vehicle transformer, characterized in that the at least one heat dissipation hole formed in at least one of the first bobbin unit and the third bobbin unit is formed in an arc shape penetrating through the center through-hole of the first bobbin unit and the third bobbin unit.

9. In claim 4, A vehicle transformer, characterized in that a plurality of heat dissipation holes formed in at least two of the first bobbin unit, the second bobbin unit, and the third bobbin unit have mutually corresponding shapes.

10. In claim 4, A vehicle transformer further comprising a heat dissipation means inserted into at least one of the above heat dissipation holes and transmitting heat generated from the coil unit in at least one of the axial and radial directions.

11. In claim 10, A vehicle transformer, characterized in that the heat dissipation means includes a gap filler applied in the form of a gel and filling at least one heat dissipation hole.

12. In claim 10, A vehicle transformer, characterized in that the heat dissipation means includes a thermal pad having a shape corresponding to at least one heat dissipation hole.

13. In claim 10, The above heat dissipation means forms a plurality of layers including a first heat dissipation layer and a second heat dissipation layer, The first heat dissipation layer is applied in a gel form and includes a gap filler that fills at least one heat dissipation hole to a first thickness, The second heat dissipation layer includes a thermal pad having a shape corresponding to the at least one heat dissipation hole and occupying the at least one heat dissipation hole with a second thickness, A vehicle transformer, characterized in that heat generated from the coil unit is sequentially transferred through the first heat dissipation layer and the second heat dissipation layer.

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