Transformer and converter including same

Abstract

A transformer and a conductor according to an embodiment of the present invention comprise: a core; a first winding disposed to surround a part of the core; and a second winding disposed to surround the first winding and a part of the core and insulated from the first winding.

Description

[Technical Field]

[0001] The present disclosure relates to a transformer, and more particularly, to a transformer with high heat dissipation efficiency.[Background Art]

[0002] Eco-friendly vehicles typically include a high-voltage battery for driving the vehicle and a low-voltage battery for driving electrical components of the vehicle. Electric energy charged in the high-voltage battery is used as a power source for the vehicle, and electric energy charged in the low-voltage battery is used as a power source for the electrical components of the vehicle.

[0003] An eco-friendly vehicle may include a circuit for power conversion and a circuit for battery charging. Such circuits often include a transformer. However, heat generated from the transformer may cause the surroundings of the transformer to be heated.

[0004] Losses generated during operation of a transformer may be classified into conduction losses and core losses. In particular, in the case of an LDC converter that requires a high output current, conduction losses caused by the high current may be regarded as a primary source of heat generation in the transformer. Heat generated in the transformer due to such conduction losses may adversely affect the temperature of the overall system and the reliability and performance of a product.

[0005] Patent Document 1 discloses a planar transformer structure that includes, in addition to essential components such as a core and windings (busbars), a heat sink additionally coupled for the purpose of heat dissipation. However, Patent Document 1 has a drawback in that manufacturing costs increase due to the additional heat sink.

[0006] Patent Document 2 relates to a cooling structure of a planar transformer, and more particularly to a cooling structure for a planar transformer using a multi-layer circuit board. However, the structure is limited to planar transformers and thus has a drawback in that it is difficult to apply the structure to general-purpose transformers having a conventional structure.[Prior Art Document][Patent Document]

[0007] Korean Patent Application No. 2020-0143028 Korean Patent Publication No. 10-2486164 [Technical Problem]

[0008] An object of the present disclosure is to provide a transformer capable of effectively dissipating heat generated in the transformer due to conduction losses caused by high current in an LDC converter requiring a high output current.

[0009] Another object of the present disclosure is to provide a transformer capable of cooling heat generated in the transformer due to conduction losses caused by high current in an LDC converter requiring a high output current without adding a separate structure.

[0010] Another object of the present disclosure is to provide a transformer having improved heat dissipation efficiency by efficiently transferring heat generated in the transformer to a heat sink without an additional member.

[0011] The objects of the present disclosure are not limited to the objects described above, and other objects not stated herein will be clearly understood by those skilled in the art from the following description.[Technical Solution]

[0012] In order to accomplish the above and other objects, a portion of a second winding is exposed to an outside of a core, the second winding is disposed to surround a first winding, and the first winding is disposed to surround a portion of the core.

[0013] Specifically, the present disclosure is characterized by including a core; a first winding disposed to surround a portion of the core; and a second winding disposed to surround the portion of the core and the first winding, the second winding being insulated from the first winding.

[0014] The core may include a first hole and a second hole through which a portion of the first winding and a portion of the second winding pass.

[0015] The core may further include: a central portion positioned inside the first winding and the second winding; and an outer portion connecting opposite ends of the central portion to define the first hole and the second hole between the outer portion and the central portion.

[0016] The central portion may extend in a first direction, and the first hole and the second hole may be formed in a second direction intersecting the first direction.

[0017] The present disclosure may further include a bobbin disposed between the outer portion and the second winding.

[0018] The first winding may be disposed to surround the central portion, and the second winding may be disposed to surround the central portion and the first winding.

[0019] The outer portion may be disposed to surround a portion of the first winding and a portion of the second winding.

[0020] The outer portion may be disposed so as not to overlap the first winding and the second winding in the second direction.

[0021] The present disclosure may further include an inductor core connected to the core; and an inductor winding disposed to surround a portion of the inductor core.

[0022] The core may include: a first hole and a second hole through which a portion of the first winding and a portion of the second winding pass; a central portion positioned inside the first winding and the second winding; and an outer portion connecting opposite ends of the central portion to define the first hole and the second hole between the outer portion and the central portion.

[0023] The inductor core may include: a third hole and a fourth hole through which a portion of the inductor winding passes; an inductor central portion positioned inside the inductor winding and having one end connected to the outer portion; and an inductor outer portion connecting the one end of the inductor central portion and the outer portion to define the third hole and the fourth hole.

[0024] The inductor winding may be disposed to surround the inductor central portion.

[0025] The inductor outer portion and a portion of the outer portion may be disposed to surround a portion of the inductor winding.

[0026] The outer portion and the inductor outer portion may be disposed so as not to overlap the first winding, the second winding, and the inductor winding in one direction.

[0027] In addition, the present disclosure includes: a heat sink configured to receive and circulate a cooling medium; a circuit board positioned above the heat sink and having a circuit formed thereon; and a transformer positioned on the circuit board. The transformer includes: a core; a first winding disposed to surround a portion of the core; and a second winding disposed to surround the portion of the core and the first winding, the second winding being insulated from the first winding. The circuit board includes a heat dissipation hole in which a portion of the second winding is positioned.

[0028] The present disclosure may further include an insulating sheet configured to connect and insulate a portion of the second winding exposed through the heat dissipation hole and a portion of the heat sink.

[0029] The heat sink may include: a heat dissipation plate defining therein a flow path through which a cooling medium flows; a coolant inlet through which the cooling medium is supplied to the heat dissipation plate; a coolant outlet through which the cooling medium is discharged from the heat dissipation plate; and a heat dissipation member protruding from the heat dissipation plate and positioned closer to the transformer than the heat dissipation plate.

[0030] A portion of the heat dissipation member may be positioned within the heat dissipation hole.

[0031] The transformer may further include a support portion connected to the second winding so as to fix the transformer to the circuit board. The circuit board may further include a support hole to which the support portion is coupled.

[0032] The core may include: a first hole and a second hole through which a portion of the first winding and a portion of the second winding pass; a central portion positioned inside the first winding and the second winding; and an outer portion connecting opposite ends of the central portion to define the first hole and the second hole between the outer portion and the central portion. The first hole, the second hole, and the heat dissipation hole may be formed in a same direction.

[0033] Details of other embodiments are included in the detailed description and the accompanying drawings.[Advantageous Effects]

[0034] A transformer and a converter of the present disclosure have one or more of the following effects.

[0035] First, in the present disclosure, a portion of a second winding, in which a high temperature is generated due to conduction losses caused by a high current, is exposed to the outside of a core, and the second winding is disposed to surround a first winding. Accordingly, the second winding, which generates high heat, contacts outside air, thereby enabling effective heat dissipation. In addition, as cooling is performed directly rather than indirectly, temperature management of the overall system is facilitated.

[0036] Second, in the present disclosure, a core of an inductor and a core of a transformer are integrally formed, and a second winding of the transformer and a winding of the inductor are exposed to the outside, thereby reducing manufacturing costs of the core. In addition, by using a single core, it is possible to reduce the space occupied by the transformer and the inductor and to effectively dissipate heat generated in the inductor and the transformer.

[0037] Third, in the present disclosure, a heat dissipation hole is formed in a circuit board on which the transformer is mounted so that the second winding of the transformer is positioned within the heat dissipation hole, and a heat generating element of a heat sink is inserted into the heat dissipation hole. Accordingly, heat generated from the second winding is dissipated by contacting outside air at an upper portion of the second winding, and a lower portion of the second winding is doubly cooled by a cooling medium through a heat dissipation member and the heat sink.

[0038] The effects of the present disclosure are not limited to the effects described above, and other effects not mentioned will be clearly understood by those skilled in the art from the claims.[Brief Description of Drawings]

[0039] FIG. 1 is a perspective view of a transformer according to an embodiment of the present disclosure. FIG. 2 is a plan view of the transformer shown in FIG. 1. FIG. 3 is a cross-sectional view taken along line 3-3' of the transformer shown in FIG. 1. FIG. 4 is a perspective view of the transformer shown in FIG. 1 with some components removed. FIG. 5 is a perspective view of a transformer according to another embodiment of the present disclosure. FIG. 6 is a plan view of the transformer shown in FIG. 5. FIG. 7 is a cross-sectional view taken along line 7-7' of the transformer shown in FIG. 5. FIG. 8 is a plan view of an integrated core shown in FIG. 5. FIG. 9 is a perspective view of a converter according to an embodiment of the present disclosure. FIG. 10 is an exploded perspective view of the converter shown in FIG. 9. FIG. 11 is an exploded perspective view of the converter shown in FIG. 9, viewed from a direction different from that of FIG. 10. FIG. 12 is a cross-sectional view taken along line 12-12' of the converter shown in FIG. 9. FIG. 13 is a reference view illustrating a coupling relationship between a second winding of a transformer and a circuit board, according to an embodiment of the present disclosure. FIG. 14 is a reference view of FIG. 13 viewed from rear. [Mode for the Invention]

[0040] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The technical terms used herein are used to merely describe specific embodiments and should not be construed as limiting the present disclosure. In addition, the technical terms used herein should be, unless defined otherwise, interpreted as having meanings generally understood by those skilled in the art but not too broadly or too narrowly. Further, the technical terms used herein, which are determined not to exactly represent the disclosure, should be replaced by or understood by such technical terms as being able to be exactly understood by those skilled in the art. Further, the general terms used herein should be interpreted in the context as defined in the dictionary, but not in an excessively narrowed manner.

[0041] FIG. 1 is a perspective view of a transformer according to an embodiment of the present disclosure, FIG. 2 is a plan view of the transformer shown in FIG. 1, FIG. 3 is a cross-sectional view taken along line 3-3' of the transformer shown in FIG. 1, and FIG. 4 is a perspective view of the transformer shown in FIG. 1 with some components removed.

[0042] Referring to FIGS. 1 to 4, a transformer 100 according to an embodiment of the present disclosure includes a core 110, a first winding 120 disposed to surround a portion of the core 110, and a second winding 130 disposed to surround the first winding 120 and the portion of the core 110 and insulated from the first winding 120.

[0043] The core 110 may include a magnetic material having magnetic properties. The core 110 may have a structure in which a portion of the second winding 130 is exposed to the outside of the core 110 and another portion of the second winding 130 is positioned inside the core 110.

[0044] For example, the core 110 may include a first hole 113 and a second hole 114 through which a portion of the first winding 120 and a portion of the second winding 130 pass. The first hole 113 and the second hole 114 may have a rectangular shape elongated in one direction.

[0045] The core 110 may include a central portion 111 positioned inside the first winding 120 and the second winding 130, and an outer portion 112 connecting opposite ends of the central portion 111 to define the first hole 113 and the second hole 114 between the outer portion 112 and the central portion 111.

[0046] The central portion 111 extends in a first direction (a front-rear (FR) direction). The outer portion 112 may define a closed curve when viewed from above. Specifically, the outer portion 112 may be connected to front and rear ends of the central portion 111, and may have a rectangular ring shape surrounding the central portion 111.

[0047] The first hole 113 and the second hole 114 may be formed in a second direction intersecting the first direction. Here, when a hole is formed in one direction, it means that the hole is open in one direction and closed in another direction perpendicular to the one direction.

[0048] Specifically, the first hole 113 and the second hole 114 may be formed to be open in an up-down (UD) direction.

[0049] The first winding 120 may include a conductive coil having an outer surface covered with an insulating material. The first winding 120 may be disposed to surround a portion of the core 110. A first power source may be electrically connected to the first winding 120.

[0050] Specifically, the first winding 120 may be disposed to surround the central portion 111 of the core 110. The first winding 120 may be wound around the central portion 111. The first winding 120 may define an internal space 121 that is open in the front-rear direction.

[0051] The second winding 130 may include a conductive coil having an outer surface covered with an insulating material. The second winding 130 may be disposed to surround a portion of the core 110 and the first winding 120. A second power source may be electrically connected to the second winding 130.

[0052] A current flowing through the second winding 130 may be higher than a current flowing through the first winding 120.

[0053] Specifically, the second winding 130 may be disposed to surround the central portion 111 of the core 110 and the first winding 120. The second winding 130 may be arranged in a plurality of rows. In this case, the second winding 130 may be disposed to surround a portion of the first winding 120 so that another portion of the first winding 120 is exposed to the outside.

[0054] The outer portion 112 may be disposed to surround a portion of the first winding 120 and a portion of the second winding 130. Accordingly, a portion of the second winding 130 may be exposed to the outside of the outer portion 112. A portion of the first winding 120 may be exposed to the outside of the outer portion 112, or may not be exposed.

[0055] A portion of the first winding 120 and a portion of the second winding 130 may be positioned inside the first hole 113 and the second hole 114 formed in the core 110.

[0056] The first winding 120 may be positioned so as not to overlap the second winding 130 in the front-rear direction. The first winding 120 may be positioned to overlap the second winding 130 in the up-down direction and a left-right (LeRi) direction.

[0057] Accordingly, an upper end of the second coil 130 is positioned above an upper end of the central portion 111 and an upper end of the outer portion 112, and a lower end of the second coil 130 is positioned below a lower end of the central portion 111 and a lower end of the outer portion 112.

[0058] The outer portion 112 may be positioned so as not to overlap the first winding 120 and the second winding 130 in the second direction. Specifically, the outer portion 112 may be positioned so as not to overlap the first winding 120 and the second winding 130 in the up-down direction, thereby exposing a portion of the second winding 130 to the outside of the core 110.

[0059] The outer portion 112 may be positioned to overlap the first winding 120, the second winding 130, and the central portion 111 in the front-rear direction and the left-right direction.

[0060] Accordingly, a portion of the second winding 130 exposed above the core 110 may contact outside air to dissipate heat of the second winding 130, and a portion of the second winding 130 exposed below the core 110 may contact outside air or exchange heat with a heat sink, thereby efficiently dissipating heat from the second winding 130 both upward and downward.

[0061] A bobbin may be disposed between the outer portion 112 and the second winding 130. The bobbin is an insulator for preventing a short circuit between the core 110 and the second winding 130.

[0062] In addition, the transformer 100 of the present disclosure may include a plurality of support portions 151, 152, and 153 connected to the first winding 120 or the second winding 130. The plurality of support portions 151, 152, and 153 may be connected to the first winding 120 or the second winding 130 to supply power to the first winding 120 or the second winding 130 and to fix the transformer 100 to a circuit board 300.

[0063] The plurality of support portions 151, 152, and 153 may protrude below the core 110.

[0064] FIG. 5 is a perspective view of a transformer 100' according to another embodiment of the present disclosure, FIG. 6 is a plan view of the transformer 100' shown in FIG. 5, FIG. 7 is a cross-sectional view taken along line 7-7' of the transformer 100' shown in FIG. 5, and FIG. 8 is a plan view of an integrated core 10 shown in FIG. 5.

[0065] Referring to FIGS. 5 to 8, the transformer 100' of this embodiment is an integrated transformer 100 including an inductor.

[0066] The transformer 100' according to another embodiment of the present disclosure includes a core 110, a first winding 120 disposed to surround a portion of the core 110, a second winding 130 disposed to surround the first winding 120 and the portion of the core 110 and insulated from the first winding 120, an inductor core 160 connected to the core 110, and an inductor winding 170 disposed to surround a portion of the inductor core 160.

[0067] The transformer 100 of this embodiment further includes the inductor core 160 and the inductor winding 170 in addition to those of the embodiment shown in FIGS. 1 to 4. In the following description, components not specifically described are considered to be the same as those of the embodiment shown in FIGS. 1 to 4.

[0068] In this embodiment, the core 110 and the inductor core 160 may be integrally formed in order to reduce the space occupied by the transformer 100'. The core 110 and the inductor core 160 may be collectively referred to as an integrated core 10.

[0069] The integrated core 10 may include a magnetic material having magnetic properties.

[0070] For example, the core 110 may include a first hole 113 and a second hole 114 through which a portion of the first winding 120 and a portion of the second winding 130 pass. The first hole 113 and the second hole 114 may have a rectangular shape elongated in one direction. The core 110 may include a central portion 111 positioned inside the first winding 120 and the second winding 130, and an outer portion 112 that connects opposite ends of the central portion 111 to define the first hole 113 and the second hole 114 between the outer portion 112 and the central portion 111.

[0071] The central portion 111 extends in a first direction (front-rear direction). The outer portion 112 may define a closed curve on a plane. Specifically, the outer portion 112 may be connected to a front end and a rear end of the central portion 111, and may have a rectangular ring shape surrounding the central portion 111. Specifically, the first hole 113 and the second hole 114 may be formed to be open in the up-down direction.

[0072] The inductor core 160 may be connected to the core 110 and may provide a space in which the inductor winding 170 is wound. The inductor core 160 may have a structure in which a portion of the inductor winding 170 is exposed to the outside.

[0073] For example, the inductor core 160 may include a third hole 163 and a fourth hole 164 through which a portion of the inductor winding 170 passes, an inductor central portion 161 that is positioned inside the inductor winding 170 and has one end connected to the outer portion 112, and an inductor outer portion 162 that connects the one end of the inductor central portion 161 and the outer portion 112 to define the third hole 163 and the fourth hole 164.

[0074] The inductor central portion 161 extends in the front-rear direction. The inductor outer portion 162 may define a closed curve together with a portion of the outer portion 112 when viewed from above. Specifically, the inductor outer portion 162 may be connected to a rear end of the inductor central portion 161 and a rear end of the outer portion 112 of the core 110.

[0075] The inductor outer portion 162 may have a '' shape that surrounds left, right, and rear sides of the inductor center portion 161 when viewed from above. As another example, the inductor outer portion 162 may have a rectangular ring shape surrounding the inductor center portion 161 when viewed from above, and one surface of the inductor outer portion 162 may be connected to the rear end of the outer portion 112.

[0076] The outer portion 112 and the inductor outer portion 162 may have the same height in the up-down direction.

[0077] The inductor winding 170 may be disposed to surround the inductor central portion 161. The inductor winding 170 may be wound around the inductor central portion 161. The inductor winding 170 may be a conductive coil coated with an insulating material.

[0078] The inductor outer portion 162 and a portion of the outer portion 112 may be disposed to surround a portion of the inductor winding 170. Specifically, the inductor outer portion 162 and the portion of the outer portion 112 may be disposed to surround a portion of the inductor winding 170 when viewed in the up-down direction.

[0079] The outer portion 112 and the inductor outer portion 162 may be positioned so as not to overlap the first winding 120, the second winding 130, and the inductor winding 170 in one direction. Specifically, the outer portion 112 and the inductor outer portion 162 may be positioned so as not to overlap the first winding 120, the second winding 130, and the inductor winding 170 in the up-down direction.

[0080] The outer portion 112 and the inductor outer portion 162 may be positioned to overlap the first winding 120, the second winding 130, and the inductor winding 170 in the front-rear direction.

[0081] Upper ends of the outer portion 112 and the inductor outer portion 162 may be positioned below or at the same height as an upper end of the first winding 120, an upper end of the second winding 130, and an upper end of the inductor winding 170.

[0082] Lower ends of the outer portion 112 and the inductor outer portion 162 may be positioned above or at the same height as a lower end of the first winding 120, a lower end of the second winding 130, and a lower end of the inductor winding 170.

[0083] Accordingly, by exposing the upper and lower portions of the second winding 130 and the inductor winding 170, which generate a relatively large amount of heat, to the outside, it is possible to improve heat dissipation efficiency of the transformer 100 without an additional structure.

[0084] A length of the central portion 111 may be greater than a length of the inductor central portion 161. A thickness of the outer portion 112 may be greater than a thickness of the inductor outer portion 162.

[0085] An inductor bobbin may be disposed between the inductor outer portion 162 and the inductor winding 170. The inductor bobbin is an insulator for preventing a short circuit between the inductor core 160 and the inductor winding 170.

[0086] FIG. 9 is a perspective view of a converter 1 according to an embodiment of the present disclosure, FIG. 10 is an exploded perspective view of the converter 1 shown in FIG. 9, and FIG. 11 is an exploded perspective view of the converter 1 shown in FIG. 9, viewed from a direction different from that of FIG. 10.

[0087] The converter 1 refers to a device that converts electrical energy into another form.

[0088] For example, the converter 1 may function as one of a DC-DC converter 1, an AC-DC converter 1, a DC-AC converter 1, an AC-AC converter 1, and an LDC 1.

[0089] The DC-DC converter 1 is a device that converts a direct current (DC) voltage into another direct current voltage; the AC-DC converter 1 is a device that converts an alternating current (AC) voltage into a direct current (DC); the DC-AC converter 1 is a device that converts a direct current (DC) voltage into an alternating current (AC); the AC-AC converter 1 is a device that converts an alternating current (AC) voltage into another alternating current voltage; and the LDC (line diverter converter) 1 is used as a power conversion and protection device and is configured to safely manage alternating current (AC) power supplied from a power grid and protect connected devices and systems from power abnormalities.

[0090] The converter 1 according to an embodiment of the present disclosure includes a heat sink 200 configured to receive and circulate a cooling medium, a circuit board 300 positioned above the heat sink 200 and having a circuit formed thereon, and a transformer 100 positioned on the circuit board 300.

[0091] The transformer 100 positioned on the circuit board 300 may be any one of the transformers 100 and 100' of FIGS. 1 to 8. The transformer 100 may be mounted on the circuit board 300.

[0092] The heat sink 200 may be configured to receive and circulate a cooling medium, thereby cooling heat of the transformer 100 and / or the circuit board 300 through the cooling medium.

[0093] For example, the heat sink 200 may include a heat dissipation plate (210, 220) defining therein a flow path through which the cooling medium flows, a coolant inlet 240 through which the cooling medium is supplied to the heat dissipation plate (210, 220), a coolant outlet 250 through which the cooling medium is discharged from the heat dissipation plate (210, 220), and a heat dissipation member 230 protruding from the heat dissipation plate (210, 220) and positioned closer to the transformer 100 than the heat dissipation plate (210, 220).

[0094] In the heat dissipation plate (210, 220), a flow path 222 through which a cooling medium flows may be defined. Specifically, the heat dissipation plate (210, 220) may include an upper member 220 having a guide 221 configured to guide the cooling medium, and a lower member 210 coupled to the upper member 220 to define the flow path. The upper member 220 and the lower member 210 may be coupled by a fastening member 260.

[0095] The heat dissipation member 230 may protrude from the heat dissipation plate (210, 220) so as to be positioned closer to the transformer 100 than the heat dissipation plate (210, 220). The heat dissipation member 230 is configured to effectively transfer heat from a specific component positioned in the transformer 100 or the circuit board 300. Therefore, the heat dissipation member 230 and the heat dissipation plate (210, 220) may include a metal having excellent thermal conductivity.

[0096] The heat dissipation member 230 may have a planar area smaller than a planar area of the heat dissipation plate (210, 220) in order to intensively cool a component generating heat on the circuit board 300.

[0097] The heat dissipation member 230 may have a rectangular prism shape protruding upward from an upper surface of the upper member 220.

[0098] The circuit board 300 may be positioned above the heat sink 200. Various electronic components for performing functions of the converter 1 may be mounted on the circuit board 300.

[0099] The circuit board 300 may further include a heat dissipation hole 310 for increasing heat dissipation efficiency of the electronic components mounted on the circuit board 300.

[0100] Hereinafter, the heat dissipation hole 310 and its surrounding components will be described in detail.

[0101] FIG. 12 is a cross-sectional view taken along line 12-12' of the converter 1 shown in FIG. 9, FIG. 13 is a reference view illustrating a coupling relationship between the second winding 130 and the circuit board 300 of the transformer 100, according to an embodiment of the present disclosure, and FIG. 14 is a reference view of FIG. 13 viewed from rear.

[0102] Referring to FIGS. 12 to 14, the heat dissipation hole 310 is formed through the circuit board 300. The heat dissipation hole 310 is open in the up-down direction.

[0103] The heat dissipation hole 310 is configured to bring a specific component of the transformer 100 and the heat dissipation member 230 of the heat sink 200 into close proximity or into contact with each other, so that heat generated in the transformer 100 is directly transferred to the heat sink 200 through the heat dissipation member 230.

[0104] In detail, a portion of the second winding 130 may be positioned inside the heat dissipation hole 310. In addition, a portion of the heat dissipation member 230 may be positioned inside the heat dissipation hole 310.

[0105] The first hole 113, the second hole 114, and the heat dissipation hole 310 may be formed in the same direction.

[0106] The heat dissipation hole 310 may overlap the heat dissipation member 230 in a vertical direction. The heat dissipation hole 310 may overlap the first winding 120 and the second winding 130 in the vertical direction. Also, the heat dissipation hole 310 may overlap the central portion 111 of the core 110 in the vertical direction.

[0107] A portion of the second winding 130 may be positioned inside the heat dissipation hole 310 such that the second winding 130 comes into contact with or is positioned close to the heat dissipation member 230. Accordingly, heat generated in a lower portion of the second winding 130, where the greatest amount of heat is generated, may be dissipated through the heat sink 200, and heat generated in an upper portion of the second winding 130 may be cooled by outside air, thereby implementing a dual cooling structure that enables efficient heat dissipation.

[0108] The present disclosure may further include an insulating sheet (not shown) configured to connect and insulate a portion of the second winding 130 exposed through the heat dissipation hole 310 and a portion of the heat sink 200. The insulating sheet may be made of an insulating material having excellent thermal conductivity.

[0109] The circuit board 300 may further include a support hole 320 to which the support portion 151, 152, 153 is coupled. The support hole 320 may be positioned adjacent to the heat dissipation hole 310.

[0110] It will be apparent that, although the preferred embodiments have been shown and described above, the present disclosure is not limited to the above-described specific embodiments, and various modifications and variations can be made by those skilled in the art without departing from the scope of the appended claims. Therefore, it is intended that the modifications and variations should not be understood independently of the technical spirit or prospect of the present disclosure.

Claims

1. A transformer comprising: a core; a first winding disposed to surround a portion of the core; and a second winding disposed to surround the portion of the core and the first winding, the second winding being insulated from the first winding.

2. The transformer of claim 1, wherein the core comprises a first hole and a second hole through which a portion of the first winding and a portion of the second winding pass.

3. The transformer of claim 2, wherein the core further comprises: a central portion positioned inside the first winding and the second winding; and an outer portion connecting opposite ends of the central portion to define the first hole and the second hole between the outer portion and the central portion.

4. The transformer of claim 3, wherein the central portion extends in a first direction, and the first hole and the second hole are formed in a second direction intersecting the first direction.

5. The transformer of claim 4, further comprising a bobbin disposed between the outer portion and the second winding.

6. The transformer of claim 3, wherein: the first winding is disposed to surround the central portion; and the second winding is disposed to surround the central portion and the first winding.

7. The transformer of claim 3, wherein the outer portion is disposed to surround a portion of the first winding and a portion of the second winding.

8. The transformer of claim 4, wherein the outer portion is disposed so as not to overlap the first winding and the second winding in the second direction.

9. The transformer of claim 1, further comprising: an inductor core connected to the core; and an inductor winding disposed to surround a portion of the inductor core.

10. The transformer of claim 9, wherein the core comprises: a first hole and a second hole through which a portion of the first winding and a portion of the second winding pass; a central portion positioned inside the first winding and the second winding; and an outer portion connecting opposite ends of the central portion to define the first hole and the second hole between the outer portion and the central portion.

11. The transformer of claim 10, wherein the inductor core comprises: a third hole and a fourth hole through which a portion of the inductor winding passes; an inductor central portion positioned inside the inductor winding and having one end connected to the outer portion; and an inductor outer portion connecting the one end of the inductor central portion and the outer portion to define the third hole and the fourth hole.

12. The transformer of claim 11, wherein the inductor winding is disposed to surround the inductor central portion.

13. The transformer of claim 11, wherein the inductor outer portion and a portion of the outer portion are disposed to surround a portion of the inductor winding.

14. The transformer of claim 11, wherein the outer portion and the inductor outer portion are disposed so as not to overlap the first winding, the second winding, and the inductor winding in one direction.

15. A converter comprising: a heat sink configured to receive and circulate a cooling medium; a circuit board positioned above the heat sink and having a circuit formed thereon; and a transformer positioned on the circuit board, wherein the transformer comprises: a core; a first winding disposed to surround a portion of the core; and a second winding disposed to surround the portion of the core and the first winding, the second winding being insulated from the first winding, and wherein the circuit board comprises a heat dissipation hole in which a portion of the second winding is positioned.

16. The converter of claim 15, further comprising an insulating sheet configured to connect and insulate a portion of the second winding exposed through the heat dissipation hole and a portion of the heat sink.

17. The converter of claim 15, wherein the heat sink comprises: a heat dissipation plate defining therein a flow path through which a cooling medium flows; a coolant inlet through which the cooling medium is supplied to the heat dissipation plate; a coolant outlet through which the cooling medium is discharged from the heat dissipation plate; and a heat dissipation member protruding from the heat dissipation plate and positioned closer to the transformer than the heat dissipation plate.

18. The converter of claim 17, wherein a portion of the heat dissipation member is positioned within the heat dissipation hole.

19. The converter of claim 15, wherein the transformer further comprises a support portion connected to the second winding so as to fix the transformer to the circuit board, and wherein the circuit board further comprises a support hole to which the support portion is coupled.

20. The converter of claim 15, wherein the core comprises: a first hole and a second hole through which a portion of the first winding and a portion of the second winding pass; a central portion positioned inside the first winding and the second winding; and an outer portion connecting opposite ends of the central portion to define the first hole and the second hole between the outer portion and the central portion, and wherein the first hole, the second hole, and the heat dissipation hole are formed in a same direction.

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