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

Transformer and converter including same

[0001] The present invention relates to a transformer, and more particularly, to a transformer having excellent heat dissipation efficiency.

[0002] Eco-friendly vehicles include a high-voltage battery for vehicle propulsion and a low-voltage battery for electrical power. The electric energy stored in the high-voltage battery powers the vehicle, while the electric energy stored in the low-voltage battery powers the vehicle's electrical power.

[0003] Eco-friendly vehicles may include circuits for power conversion and battery charging, and these circuits often include transformers, but there is a problem that the area around the transformer is heated by the heat generated from the transformer.

[0004] Losses occurring during transformer operation can be categorized into conduction loss and core loss. In particular, in LDC converters requiring high output current, conduction loss due to high current is the primary source of transformer heat generation. Transformer heat generation due to high current conduction loss poses a critical threat to the overall system temperature and product reliability and performance.

[0005] Patent Document 1 applies to a planar transformer structure, and in addition to the essential core and windings (busbars), a heat sink is additionally incorporated for heat dissipation. However, Patent Document 1 has the disadvantage of increased cost due to the additional heat sink.

[0006] In the case of patent document 2, it is limited to a cooling structure of a planar transformer, and more specifically, a cooling structure of a planar transformer using a multilayer circuit board, and has a disadvantage in that it is difficult to apply to a general-purpose transformer of a general form other than a planar transformer.

[0007]

[0008] [Prior Art Literature]

[0009] [Patent Document]

[0010] Korean Patent Application No. 2020-0143028

[0011] Korean Patent Publication No. 10-2486164

[0012]

[0013] The problem to be solved by the present invention is to provide a transformer that effectively dissipates heat generated by transformer heat generation due to conduction loss caused by high current in an LDC converter that requires high output current.

[0014] Another object of the present invention is to provide a transformer that cools the heat generated by the conduction loss due to the high current in an LDC converter requiring a high output current without adding a separate structure.

[0015] Another object of the present invention is to provide a converter with improved heat dissipation efficiency by efficiently transferring heat generated in a transformer to a heat sink without a separate additional member.

[0016] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art from the description below.

[0017] In order to achieve the above task, a part of the second winding is exposed to the outside of the core, the second winding is arranged to wrap around the first winding, and the first winding is arranged to wrap around a part of the core.

[0018] Specifically, the present invention is characterized by including a core, a first winding arranged to surround a portion of the core, and a second winding arranged to surround a portion of the core and the first winding and insulated from the first winding.

[0019] 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.

[0020] The core may further include a central portion located inside the first winding and the second winding, and an outer portion connecting both ends of the central portion to define the first hole and the second hole between the central portion and the outer portion.

[0021]

[0022] 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.

[0023] It may further include a bobbin positioned between the outer portion and the second winding.

[0024] The first winding may be arranged to surround the center, and the second winding may be arranged to surround the center and the first winding.

[0025] The above outer portion may be arranged to surround a portion of the first winding and a portion of the second winding.

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

[0027] In addition, the present invention may further include an inductor core connected to the core, and an inductor winding arranged to surround a portion of the inductor core.

[0028] 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 located inside the first winding and the second winding, and an outer portion connecting both ends of the central portion to define the first hole and the second hole between the central portion and the second winding.

[0029] The inductor core may include a third hole and a fourth hole through which a part of the inductor winding passes, an inductor center positioned inside the inductor winding and having one end connected to the outer portion, and an inductor outer portion connecting one end of the inductor center to the outer portion to define the third hole and the fourth hole.

[0030]

[0031] The above inductor winding can be arranged to surround the center of the inductor.

[0032] The outer portion of the inductor and a portion of the outer portion may be arranged to surround a portion of the inductor winding.

[0033] The above outer portion and the above inductor outer portion may be positioned so as not to overlap the first winding, the second winding and the inductor winding in one direction.

[0034] In addition, the present invention includes a heat sink configured to receive and circulate a cooling medium, a circuit board positioned on the heat sink and having a circuit formed thereon, and a transformer positioned on the circuit board, the transformer including a core, a first winding arranged to surround a portion of the core, and a second winding arranged to surround a portion of the core and the first winding and being insulated from the first winding, and the circuit board further includes a heat dissipation hole in which a portion of the second winding is positioned.

[0035] In addition, the present invention may further include an insulating sheet that connects and insulates a portion of the second winding exposed through the heat dissipation hole and a portion of the heat sink.

[0036] The heat sink may include a heat sink defining a path through which a cooling medium flows inside, a refrigerant inlet for supplying the cooling medium to the heat sink, a refrigerant outlet for discharging the cooling medium of the heat sink, and a heat sink protruding from the heat sink and positioned closer to the transformer than the heat sink.

[0037] A portion of the above heat dissipation body may be positioned inside the heat dissipation hole.

[0038] The transformer may further include a support portion connected to the second winding and fixing the transformer to the circuit board, and the circuit board may further include a support hole to which the support portion is coupled.

[0039] The core includes a first hole and a second hole through which a part of the first winding and a part of the second winding pass, a central portion located inside the first winding and the second winding, and an outer portion connecting both ends of the central portion to define the first hole and the second hole between the central portion and the outer portion, and the first hole, the second hole, and the heat dissipation hole can be formed in the same direction.

[0040] Specific details of other embodiments are included in the detailed description and drawings.

[0041] According to the transformer and converter of the present invention, one or more of the following effects are achieved.

[0042] First, the present invention has the advantage of exposing a portion of the second winding, which generates high heat due to conduction loss caused by high current, to the outside of the core, and arranging the second winding to surround the first winding, so that the second winding, which generates high heat, can effectively dissipate heat by coming into contact with the outside air, and since it is direct cooling rather than indirect cooling, it is easy to manage the temperature of the system.

[0043] Second, the present invention has the advantage of manufacturing the core of the inductor and the core of the transformer as one body, and the secondary winding of the transformer and the winding of the inductor are exposed to the outside, thereby reducing the manufacturing cost of the core itself, reducing the space occupied by the transformer and the inductor by using one core, and effectively dissipating heat generated from the inductor and the transformer.

[0044] Third, the present invention has an advantage in that a heat dissipation hole is formed in the circuit board on which the transformer is mounted, in which the second winding of the transformer is positioned, and a heating element is inserted into the heat dissipation hole, so that the heat generated in the second winding is dissipated by contact with the outside air at the upper part of the second winding, and the lower part of the second winding is doubly cooled by a cooling medium through the heat dissipation element and the heat sink.

[0045] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0046] Figure 1 is a perspective view of a transformer according to one embodiment of the present invention.

[0047] Figure 2 is a plan view of the transformer illustrated in Figure 1.

[0048] Fig. 3 is a cross-sectional view taken along line 3-3' of the transformer illustrated in Fig. 1.

[0049] Fig. 4 is a perspective view of the transformer illustrated in Fig. 1 with some parts removed.

[0050] Figure 5 is a perspective view of a transformer according to another embodiment of the present invention.

[0051] Figure 6 is a plan view of the transformer illustrated in Figure 5.

[0052] Fig. 7 is a cross-sectional view taken along line 7-7' of the transformer illustrated in Fig. 5.

[0053] Figure 8 is a plan view of the integrated core illustrated in Figure 5.

[0054] Figure 9 is a perspective view of a converter according to one embodiment of the present invention.

[0055] Figure 10 is an exploded perspective view of the converter illustrated in Figure 9.

[0056] Fig. 11 is an exploded perspective view of the converter illustrated in Fig. 9 viewed from a different direction than Fig. 10.

[0057] Fig. 12 is a cross-sectional view taken along line 12-12' of the converter illustrated in Fig. 9.

[0058] Fig. 13 is a reference diagram illustrating the coupling relationship between the second winding of a transformer and a circuit board according to one embodiment of the present invention.

[0059] Figure 14 is a reference drawing of Figure 13 viewed from the back.

[0060] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. However, it should be noted that the technical terms used in this specification are only used to describe specific embodiments and are not intended to limit the spirit of the technology disclosed in this specification. In addition, the technical terms used in this specification should be interpreted as having a meaning generally understood by a person having ordinary skill in the art to which the technology disclosed in this specification belongs, unless specifically defined to have a different meaning in this specification, and should not be interpreted in an excessively broad sense or an excessively narrow sense. In addition, when a technical term used in this specification is an incorrect technical term that does not accurately express the spirit of the technology disclosed in this specification, it should be replaced with a technical term that can be correctly understood by a person skilled in the art. In addition, general terms used in this specification should be interpreted according to their dictionary definitions or according to the preceding and following context, and should not be interpreted in an excessively narrow sense.

[0061] FIG. 1 is a perspective view of a transformer according to one embodiment of the present invention, FIG. 2 is a plan view of the transformer illustrated in FIG. 1, FIG. 3 is a cross-sectional view taken along line 3-3' of the transformer illustrated in FIG. 1, and FIG. 4 is a perspective view of the transformer illustrated in FIG. 1 with some parts removed.

[0062] Referring to FIGS. 1 to 4, a transformer (100) according to one embodiment of the present invention includes a core (110), a first winding (120) arranged to surround a portion of the core (110), and a second winding (130) arranged to surround a portion of the core (110) and the first winding (120) and is insulated from the first winding (120).

[0063] The core (110) may include a magnetic material having magnetism. The core (110) may have a structure in which a part of the second winding (130) is exposed to the outside of the core (110) and another part of the second winding (130) is located inside the core (110).

[0064] 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 be rectangular and elongated in one direction.

[0065] The core (110) may include a central portion (111) located inside the first winding (120) and the second winding (130), and an outer portion (112) connecting both ends of the central portion (111) to define a first hole (113) and a second hole (114) between the central portion (111).

[0066] The central portion (111) extends in the first direction (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 the front and rear ends of the central portion (111) and may have a square ring shape that surrounds the central portion (111).

[0067] The first hole (113) and the second hole (114) can 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 orthogonal to the one direction.

[0068] Specifically, the first hole (113) and the second hole (114) are formed to be open in the up-down (UD) direction.

[0069] The first winding (120) may include a conductive coil whose exterior is covered with an insulator. The first winding (120) is arranged to surround a portion of the core (110). A first power source may be electrically connected to the first winding (120).

[0070] Specifically, the first winding (120) can be arranged to surround the center (111) of the core (110). The first winding (120) is wound around the center (111). The first winding (120) can define an internal space (121) that is open in the front-back direction.

[0071] The second winding (130) may include a conductive coil whose exterior is covered with an insulator. The second winding (130) is arranged 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).

[0072] The current flowing in the second winding (130) may be higher than the current flowing in the first winding (120).

[0073] Specifically, the second winding (130) may be arranged to surround the center (111) of the core (110) and the first winding (120). The second winding (130) may also be arranged in multiple rows. In this case, the second winding (130) may be arranged to surround a portion of the first winding (120) so that another portion of the first winding (120) may be exposed to the outside.

[0074] The outer portion (112) may be arranged 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 or may not be exposed to the outside of the outer portion (112).

[0075] A portion of the first winding (120) and a portion of the second winding (130) are positioned inside the first hole (113) and the second hole (114) formed in the core (110).

[0076] The first winding (120) can be positioned so as not to overlap with the second winding (130) in the front-back direction. The first winding (120) can be positioned so as to overlap with the second winding (130) in the up-down direction and left-right direction (LeRi).

[0077] Accordingly, the upper end of the second winding (130) is positioned above the upper end of the central portion (111) and the upper end of the outer portion (112), and the lower end of the second winding (130) is positioned below the lower end of the central portion (111) and the lower end of the outer portion (112).

[0078] The outer portion (112) is positioned so as not to overlap the first winding (120) and the second winding (130) in the second direction. Specifically, the outer portion (112) is positioned so as not to overlap the first winding (120) and the second winding (130) in the vertical direction, thereby exposing a portion of the second winding (130) to the outside of the core (110).

[0079] The outer portion (112) is positioned to overlap with the first winding (120), the second winding (130), and the center portion (111) in the front-back and left-right directions.

[0080] Accordingly, the second winding (130) exposed above the core (110) is in contact with the outside air to dissipate the heat of the second winding (130), and the second winding (130) exposed below the core (110) is in contact with the outside air or exchanges heat with a heat sink to efficiently dissipate the heat of the second winding (130) from above and below.

[0081] A bobbin is positioned between the outer portion (112) and the second winding (130). The bobbin serves as an insulator and prevents short circuiting between the core (110) and the second winding (130).

[0082] In addition, the transformer (100) of the present invention may include a plurality of support members (151, 152, 153) connected to the first winding (120) or the second winding (130). The plurality of support members (151, 152, 153) are 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 may fix the transformer (100) to the circuit board (300).

[0083] A plurality of supports (151, 152, 153) may protrude below the core (110).

[0084]

[0085] FIG. 5 is a perspective view of a transformer (100') according to another embodiment of the present invention, FIG. 6 is a plan view of the transformer (100') illustrated in FIG. 5, FIG. 7 is a cross-sectional view taken along line 7-7' of the transformer (100') illustrated in FIG. 5, and FIG. 8 is a plan view of the integral core (10) illustrated in FIG. 5.

[0086] Referring to FIGS. 5 to 8, a transformer (100') according to one embodiment of the present invention is an integrated transformer (100) including an inductor.

[0087] A transformer (100') according to another embodiment of the present invention includes a core (110), a first winding (120) arranged to surround a portion of the core (110), a second winding (130) arranged to surround a portion of the core (110) and the first winding (120) and insulated from the first winding (120), an inductor core (160) connected to the core (110), and an inductor winding (170) arranged to surround a portion of the inductor core (160).

[0088] A transformer (100) of another embodiment of the present invention further includes an inductor core (160) and an inductor winding (170) in the embodiments of FIGS. 1 to 4. Hereinafter, the configuration without special description is considered to be the same as the configuration of the embodiments of FIGS. 1 to 4.

[0089] In another embodiment of the present invention, the core (110) and the inductor core (160) may be formed integrally to reduce the space occupied by the transformer (100'). The core (110) and the inductor core (160) may be collectively referred to as an integral core (10).

[0090] The integral core (10) may include a magnetic material having magnetism.

[0091] 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 be rectangular and elongated in one direction. The core (110) may include a center portion (111) located inside the first winding (120) and the second winding (130), and an outer portion (112) connecting both ends of the center portion (111) to define the first hole (113) and the second hole (114) between the center portion (111).

[0092] The central portion (111) extends in the first direction (front-back direction). The outer portion (112) may define a closed curve on a plane. Specifically, the outer portion (112) may be connected to the front and rear ends of the central portion (111) and may have a square ring shape surrounding the central portion (111). Specifically, the first hole (113) and the second hole (114) are formed to be open in the vertical direction.

[0093] The inductor core (160) is connected to the core (110) and provides a space in which the inductor winding (170) is wound. The inductor core (160) may have a structure that exposes a portion of the inductor winding (170) to the outside.

[0094] For example, the inductor core (160) may include a third hole (163) and a fourth hole (164) through which a part of the inductor winding (170) passes, an inductor center (161) located inside the inductor winding (170) and having one end connected to the outer portion (112), and an inductor outer portion (162) connecting one end of the inductor center (161) to the outer portion (112) to define the third hole (163) and the fourth hole (164).

[0095] The inductor center (161) extends in the forward and backward directions. The inductor outer portion (162) can define a closed curve together with a portion of the outer portion (112) when viewed from above. Specifically, the inductor outer portion (162) is connected to the rear end of the inductor center (161) and the rear end of the outer portion (112) of the core (110).

[0096] The inductor outer portion (162) may have a ㄷ shape that surrounds the 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 square ring shape that surrounds the inductor center portion (161) when viewed from above, and one side of the inductor outer portion (162) may be connected to the rear end of the outer portion (112).

[0097] The vertical heights of the outer portion (112) and the outer portion of the inductor (162) may be the same.

[0098] The inductor winding (170) is arranged to surround the inductor center (161). The inductor winding (170) is wound around the inductor center (161). The inductor winding (170) may be a coil of a conductive material coated with an insulator.

[0099] The inductor outer portion (162) and a portion of the outer portion (112) may be arranged to surround a portion of the inductor winding (170). Specifically, the inductor outer portion (162) and a portion of the outer portion (112) may be arranged to surround a portion of the inductor winding (170) when viewed from the top and bottom.

[0100] The outer portion (112) and the inductor outer portion (162) can be positioned so as not to overlap with 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) are positioned so as not to overlap with the first winding (120), the second winding (130), and the inductor winding (170) in the vertical direction.

[0101] The outer portion (112) and the inductor outer portion (162) can be positioned to overlap the first winding (120), the second winding (130), and the inductor winding (170) in the front-back direction.

[0102] The upper end of the outer portion (112) and the inductor outer portion (162) may be positioned below or at the same height as the upper end of the first winding (120), the upper end of the second winding (130), and the upper end of the inductor winding (170).

[0103] The lower end of the outer portion (112) and the inductor outer portion (162) may be positioned above or at the same height as the lower end of the first winding (120), the lower end of the second winding (130), and the lower end of the inductor winding (170).

[0104] Accordingly, the heat dissipation efficiency of the transformer (100) can be improved without additional structure by exposing the upper and lower portions of the second winding (130) and the inductor winding (170), which generate a lot of heat, to the outside.

[0105] The length of the central portion (111) may be longer than the length of the inductor central portion (161). The thickness of the outer portion (112) may be thicker than the thickness of the inductor outer portion (162).

[0106] An inductor bobbin is positioned between the inductor outer portion (162) and the inductor winding (170). The inductor bobbin is an insulator and prevents short circuiting between the inductor core (160) and the inductor winding (170).

[0107]

[0108] FIG. 9 is a perspective view of a converter (1) according to one embodiment of the present invention, FIG. 10 is an exploded perspective view of the converter (1) illustrated in FIG. 9, and FIG. 11 is an exploded perspective view of the converter (1) illustrated in FIG. 9 viewed from a different direction from FIG. 10.

[0109] A converter (1) refers to a device that converts electrical energy into another form.

[0110] For example, the converter (1) can 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.

[0111] A DC-DC converter (1) is a device that converts direct current (DC) voltage into another direct current voltage, an AC-DC converter (1) is a device that converts alternating current (AC) voltage into direct current (DC), a DC-AC converter (1) is a device that converts direct current (DC) voltage into alternating current (AC), an AC-AC converter (1) is a device that converts alternating current (AC) voltage into another alternating current voltage, and an LDC (line diverter converter (1)) device is used as a power conversion and protection device, and is a device that safely manages alternating current (AC) power coming from a power grid and protects connected devices and systems from power abnormalities.

[0112] Another converter (1) according to one embodiment of the present invention comprises 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).

[0113] The transformer (100) positioned on the circuit board (300) may be any one of the transformers (100, 100') of FIGS. 1 to 8. The transformer (100) may be mounted on the circuit board (300).

[0114] The heat sink (200) is configured to receive and circulate a cooling medium, thereby cooling the heat of the transformer (100) or / and the circuit board (300) through the cooling medium.

[0115] For example, the heat sink (200) may include a heat sink (210, 220) defining a path through which a cooling medium flows inside, a refrigerant inlet (240) supplying a cooling medium to the heat sink (210, 220), a refrigerant outlet (250) through which the cooling medium of the heat sink (210, 220) flows out, and a heat sink (230) protruding from the heat sink (210, 220) and positioned closer to the transformer (100) than the heat sink (210, 220).

[0116] In the case of the heat sink (210, 220), a flow path (222) through which a cooling medium flows is defined. Specifically, the heat sink (210, 220) may include an upper member (220) in which a guide (221) for guiding the cooling medium is formed, and a lower member (210) that is coupled with the upper member (220) to define a flow path. The upper member (220) and the lower member (210) are coupled by a fastening member (260).

[0117] The heat sink (230) protrudes from the heat sink (210, 220) and is positioned closer to the transformer (100) than the heat sink (210, 220). The heat sink (230) is configured to effectively transfer heat of a specific configuration located in the transformer (100) or the circuit board (300). Therefore, the heat sink (230) and the heat sink (210, 220) may include a metal having excellent heat transfer coefficient.

[0118] The heat sink (230) may have a smaller flat surface area than the flat surface area of ​​the heat sink (210, 220) in order to intensively cool the heat-generating member in the circuit board (300).

[0119] The radiator (230) may have a square pillar shape protruding upward from the upper surface of the upper member.

[0120] A circuit board (300) is positioned on top of a heat sink (200). Various electronic components for performing the function of the converter (1) can be mounted on the circuit board (300).

[0121] The circuit board (300) may further include a heat dissipation hole (310) to improve the heat dissipation efficiency of electronic components mounted on the circuit board (300).

[0122]

[0123] Below, the heat dissipation hole (310) and its surrounding configuration will be described in detail.

[0124] FIG. 12 is a cross-sectional view taken along line 12-12' of the converter (1) illustrated in FIG. 9, FIG. 13 is a reference view illustrating the coupling relationship between the second winding (130) and the circuit board (300) of the transformer (100) according to one embodiment of the present invention, and FIG. 14 is a reference view viewed from the back of FIG. 13.

[0125] Referring to FIGS. 12 to 14, a heat dissipation hole (310) is formed by penetrating the circuit board (300). The heat dissipation hole (310) is open in the vertical direction.

[0126] The heat dissipation hole (310) is configured to bring a part of the transformer (100) and the heat dissipation body (230) of the heat sink (200) as close as possible to or in contact with each other, thereby directly transferring the heat generated in the transformer (100) to the heat sink (200) through the heat dissipation body (230).

[0127] Specifically, a part of the second winding (130) may be positioned inside the heat dissipation hole (310). In addition, a part of the heat dissipation body (230) may be positioned inside the heat dissipation hole (310).

[0128] The first hole (113), the second hole (114) and the heat dissipation hole (310) can be formed in the same direction.

[0129] The heat dissipation hole (310) may be positioned to overlap with the heat dissipation body (230) in a vertical direction. The heat dissipation hole (310) may be positioned to overlap with the first winding (120) and the second winding (130) in a vertical direction. Of course, the heat dissipation hole (310) may be positioned to overlap with the center (111) of the core (110) in a vertical direction.

[0130] Since a part of the second winding (130) is positioned inside the heat dissipation hole (310), the second winding (130) is in contact with or close to the heat dissipation body (230), so that the heat of the lower part of the second winding (130) where the most heat is generated is dissipated through the heat sink (200), and the heat of the upper part of the second winding (130) is cooled by the outside air, thereby implementing a double cooling structure, thereby enabling efficient heat dissipation.

[0131] The present invention may further include an insulating sheet (not shown) that connects and insulates 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 selected from an insulating material having excellent thermal conductivity.

[0132] The circuit board (300) may further include a support hole (320) to which the support members (151, 152, 153) are coupled. The support hole (320) may be positioned adjacent to the heat dissipation hole (310).

[0133]

[0134] Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and various modifications may be made by a person skilled in the art to which the invention pertains without departing from the gist of the present invention as claimed in the claims. Furthermore, such modifications should not be understood individually from the technical idea or prospect of the present invention.

Claims

1. Core; A first winding arranged to surround a portion of the above core; A transformer comprising a second winding arranged to surround a portion of the core and the first winding and insulated from the first winding.

2. In paragraph 1, The above core is, A transformer comprising a first hole and a second hole through which a portion of the first winding and a portion of the second winding pass.

3. In paragraph 2, The above core is, A center located inside the first winding and the second winding, A transformer further comprising an outer portion connecting both ends of the central portion and defining the first hole and the second hole between the central portion and the outer portion.

4. In paragraph 3, A transformer in which 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. In paragraph 4, A transformer further comprising a bobbin positioned between the outer portion and the second winding.

6. In paragraph 3, The above first coil is arranged to surround the center, A transformer in which the second winding is arranged to surround the center and the first winding.

7. In paragraph 3, A transformer in which the outer shell is arranged to surround a portion of the first winding and a portion of the second winding.

8. In paragraph 4, A transformer in which the outer portion is positioned so as not to overlap the first winding and the second winding in the second direction.

9. In paragraph 1, An inductor core connected to the above core; A transformer further comprising an inductor winding arranged to surround a portion of the inductor core.

10. In paragraph 9, The above core is, A first hole and a second hole through which a portion of the first winding and a portion of the second winding pass; A center positioned inside the first winding and the second winding; and A transformer including an outer portion connecting both ends of the central portion and defining the first hole and the second hole between the central portion and the outer portion.

11. In paragraph 10, The above inductor core, Third and fourth holes through which part of the above inductor winding passes; An inductor center located inside the inductor winding and having one end connected to the outer portion; and A transformer comprising an inductor outer portion that is connected to one end of the central portion of the inductor and connects the outer portion to define the third hole and the fourth hole.

12. In paragraph 11, A transformer in which the above inductor winding is arranged to surround the center of the inductor.

13. In paragraph 11, A transformer in which the outer portion of the inductor and a portion of the outer portion are arranged to surround a portion of the inductor winding.

14. In paragraph 11, A transformer in which the outer portion and the outer portion of the inductor are positioned so as not to overlap the first winding, the second winding, and the inductor winding in one direction.

15. 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 including a transformer positioned on the circuit board; The above transformer, core; A first winding arranged to surround a portion of the core; and A second winding is disposed to surround a portion of the core and the first winding and is insulated from the first winding, A converter wherein the circuit board further includes a heat dissipation hole in which a portion of the second winding is positioned.

16. In paragraph 15, A converter further comprising an insulating sheet that connects and insulates a portion of the second winding exposed through the heat dissipation hole and a portion of the heat sink.

17. In paragraph 15, The above heat sink, A heat sink defining a path through which a cooling medium flows inside; A refrigerant inlet for supplying a cooling medium to the above heat sink; A refrigerant outlet through which the cooling medium of the above heat sink flows out; and A converter including a heat sink protruding from the heat sink and positioned closer to the transformer than the heat sink.

18. In paragraph 17, A converter wherein a portion of the above heat sink is located inside the above heat sink hole.

19. In paragraph 15, The above transformer, Further comprising a support member connected to the second winding and fixing the transformer to the circuit board, A converter wherein the circuit board further includes a support hole to which the support portion is coupled.

20. In paragraph 15, The above core is, A first hole and a second hole through which a portion of the first winding and a portion of the second winding pass; A center positioned inside the first winding and the second winding; and Including an outer portion that connects both ends of the central portion and defines the first hole and the second hole between the central portion and the outer portion, A converter in which the first hole, the second hole, and the heat dissipation hole are formed in the same direction.

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