Power converter

Abstract

An embodiment of the present invention includes a bobbin containing a hollow; a coil wound on the bobbin; and a core disposed to enclose the coil and the bobbin, wherein the bobbin includes an upper part, a lower part, and a central part between the upper part and the lower part on which the coil is wound, and the lower part of the bobbin has a hole formed therein.

Description

Technical Field

[0001] The present invention relates to a power conversion device.

Background Art

[0002] Generally, an environmentally friendly vehicle is equipped with a power source composed of a drive motor driven by the power of an engine and / or a battery. Therefore, it refers to a vehicle that applies a structure in which the above power source is appropriately combined with the front wheels and can induce fuel efficiency improvement by power assistance of a motor operated by the voltage of a battery at the time of starting and / or accelerating the vehicle.

[0003] An environmentally friendly vehicle is equipped with a power conversion device (LDC: Low DC / DC Converter) that rectifies the power of a high-voltage battery into direct current. The power conversion device generally switches general direct current (DC) into alternating current (AC), and boosts or降压 this alternating current using a coil, transformer, capacitance, etc. Then, it rectifies again into direct current (DC) and plays a role of supplying electricity according to the voltage used by each electric field load.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The technical problem to be solved by the present invention is to provide a power conversion device.

Means for Solving the Problems

[0005] To solve the above technical problem, the transformer according to this embodiment includes a bobbin containing a hollow; a coil wound around the bobbin; and a core arranged to wrap the coil and the bobbin. The bobbin includes an upper part, a lower part, and a central part around which the coil is wound between the upper part and the lower part, and a hole is formed in the lower part of the bobbin.

[0006] The lower part of the bobbin includes a recess in which the hole is formed, and the recess may include a plurality of recesses formed spaced apart from the end of the lower part of the bobbin.

[0007] The upper part of the bobbin includes an upper surface facing the core and a projection that protrudes outward from the upper surface, the projection being able to overlap the coil from the upper part downward.

[0008] The aforementioned hole can be made so as not to overlap with the protruding portion in the direction from the upper part to the lower part.

[0009] The upper part of the bobbin includes a guide wall that protrudes between the upper surface and the protruding portion, and the inner surface of the guide wall can face the core.

[0010] To solve the aforementioned technical problems, the power converter according to this embodiment includes a first housing; a first substrate disposed in the first housing; and a transformer disposed on the first substrate, wherein the transformer includes a bobbin containing a hollow; a coil wound on the bobbin; and a core disposed to enclose the coil and the bobbin, wherein the bobbin includes an upper part, a lower part, and a central part between the upper part and the lower part on which the coil is wound, and the transformer can be coupled to the first housing by a screw disposed in a hole formed in the lower part of the bobbin.

[0011] A fixing member is inserted into the first housing from the outside to the inside, and the screw, which is positioned in the hole of the bobbin, can be coupled with the fixing member.

[0012] The system includes a second housing coupled to the first housing, and a second substrate disposed in the second housing, the second substrate including support members positioned in a location corresponding to the transformer.

[0013] The support member includes a first pad placed on the second substrate and a second pad placed on the first pad, the second pad may be made of an elastic material or a sponge material.

[0014] The upper part of the bobbin includes an upper surface facing the core and a projection that protrudes outward from the upper surface, the projection being able to overlap the coil from the upper part downward.

[0015] The hole in the bobbin can be made so as not to overlap with the protruding portion in the direction from the top to the bottom.

[0016] The upper part of the bobbin includes a guide wall that protrudes between the upper surface and the protruding portion, and the inner surface of the guide wall can face the core. [Effects of the Invention]

[0017] According to this embodiment, a large-volume transformer can be coupled to the housing to minimize the occurrence of substrate warping, and the effects of vertical vibration can be reduced via the support member.

[0018] Furthermore, by placing heat-generating components in an area that overlaps with the fan module, heat dissipation performance can be improved. Also, by placing components on both sides of the heatsink and structures in front of and behind it, air circulation can be concentrated on the heatsink.

[0019] Furthermore, by creating a space below the switching module, additional elements can be placed to improve space efficiency.

[0020] Furthermore, by arranging each component symmetrically with respect to the heatsink, the circuit design can be optimized and weight balance can be achieved.

[0021] Moreover, by integrating and applying a plurality of switching element parts to one heat sink, the maximum temperature of the parts in the switching module can be lowered, thermal equilibrium can be achieved, and the heat dissipation performance can be optimized.

Brief Description of the Drawings

[0022] [Figure 1] It is a perspective view of the power conversion device according to this embodiment. [Figure 2] It is an exploded perspective view of the power conversion device according to this embodiment. [Figure 3] It is an exploded perspective view of the power conversion device according to this embodiment. [Figure 4] It is a view of the first assembly according to this embodiment. [Figure 5] It is a view of the second assembly according to this embodiment. [Figure 6] It is a front view of the first switching module according to this embodiment. [Figure 7] It is a perspective view of the first switching module according to this embodiment. [Figure 8] It is a perspective view of the fourth switching module according to this embodiment. [Figure 9] It is a perspective view of the fourth switching module seen from another angle and FIG. 8. [Figure 10] It is a perspective view of the transformer according to this embodiment. [Figure 11] It is a perspective view of the bobbin according to this embodiment. [Figure 12] It is a view for explaining the arrangement of the transformer according to this embodiment. [Figure 13] It is a view of the first and second assemblies according to this embodiment. [Figure 14] It is a cross-sectional view taken along line A of FIG. 13. [Figure 15] It is a cross-sectional view taken along line B of FIG. 13. [Figure 16] It is a partial view of the second assembly according to this embodiment. [Figure 17] It is a partial view of the second assembly according to this embodiment. [Modes for carrying out the invention]

[0023] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0024] However, the technical concept of the present invention is not limited to the embodiments described, but can be embodied in various different forms, and within the scope of the technical concept of the present invention, one or more components of the embodiments can be selectively combined or substituted for each other.

[0025] Furthermore, unless explicitly defined and described, terms used in the embodiments of the present invention (including technical and scientific terms) should be interpreted in the sense generally understood by a person skilled in the art to which the invention pertains, and commonly used terms, such as those defined in dictionaries, should be interpreted in consideration of their contextual meaning as described in the present invention.

[0026] Furthermore, the terminology used in these embodiments is for illustrative purposes only and does not limit the present invention.

[0027] In this specification, singular types may also include plural types unless otherwise specified in the text, and when it says "A and / or at least one of B, C," it may include one or more of all possible combinations of A, B, and C.

[0028] Furthermore, when describing the components of this embodiment, terms such as 1st, 2nd, A, B, (a), (b), etc., can be used. Such terms are used to distinguish a component from other components, and the term does not limit the essence, order, or sequence of the component in question.

[0029] Furthermore, when it is stated that one component is “linked,” “joined,” or “connected” to another component, this may include not only cases where the component is directly “linked,” “joined,” or “connected” to the other component, but also cases where it is “linked,” “joined,” or “connected” by another component that lies between it and the other component.

[0030] Furthermore, when described as being formed or positioned "above" or "below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or positioned between the two components. Also, when expressed as "above" or "below," it can include not only an upward direction but also a downward direction relative to one component.

[0031] Figure 1 is a perspective view of the power converter according to this embodiment, Figure 2 is an exploded perspective view of the power converter according to this embodiment, Figure 3 is an exploded perspective view of the power converter according to this embodiment, Figure 4 is a drawing of the first assembly according to this embodiment, Figure 5 is a drawing of the second assembly according to this embodiment, Figure 6 is a front view of the first switching module according to this embodiment, Figure 7 is a perspective view of the first switching module according to this embodiment, Figure 8 is a perspective view of the fourth switching module according to this embodiment, and Figure 9 is a view of Figure 8 from a different angle. Figure 10 is a perspective view of the fourth switching module, Figure 11 is a perspective view of the bobbin according to this embodiment, Figure 12 is a diagram illustrating the arrangement of the transformer according to this embodiment, Figure 13 is a diagram of the first and second assemblies according to this embodiment, Figure 14 is a cross-sectional view taken from line A in Figure 13, Figure 15 is a cross-sectional view taken from line B in Figure 13, Figure 16 is a partial diagram of the second assembly according to this embodiment, and Figure 17 is a partial diagram of the second assembly according to this embodiment.

[0032] The power converter 1000 according to this embodiment may include a fan module 10, a first assembly 200 located in the first housing 20, and a second assembly 300 located in the second housing 30.

[0033] The power converter 1000 in this embodiment may be a power module. The power converter 1000 may be a power supply unit (PSU). The power converter 1000 may be a power circuit device that generates the required output power from input power. The power converter 1000 may be a device that supplies the power necessary for battery charging, and may be a device that converts the input commercial AC power into the DC power required by the battery and outputs it.

[0034] The power converter 1000 may include an EMI (Electromagnetic Interference) filter connected to the AC power supply to the power converter, a PFC (Power Factor Correction) section connected to the EMI filter, and a DC / DC converter section connected to the PFC section. Specifically, the EMI filter can remove noise from the AC power supply. The PFC section matches the voltage and rectification of the AC power supply rectified by the EMI filter in phase. The PFC section can also be called an AC / DC converter section. The PFC section boosts the input power supply after correcting the power factor. The DC / DC converter section then converts the power supply into a DC power supply that meets the specifications of the load being supplied.

[0035] The power converter 1000 may include components such as a fan module, EMI filter, AC socket, PFC section, DC-DC converter section, and flyback converter, and each component may affect the others depending on its size and mounting location. As a result, the overall size of the power converter 1000 may vary.

[0036] The fan module 10 can be positioned in front of the power converter 1000. The fan module 10 can be positioned on one side of the power converter 1000. The fan module 10 can cool the components positioned in the power converter 1000. A vent can be positioned behind the power converter 1000, on the opposite side from where the fan module 10 is positioned. When the fan module 10 operates, outside air flows in, cooling the heat-generating components. The direction connecting the fan module 10 to the vent can be called the first direction. The direction perpendicular to the first direction can be called the second direction.

[0037] The fan module 10 may include at least one fan that is placed on the panel 11. The fan module 10 may include first to third fans 12, 13, and 14 that are placed in a row on the panel 11. The first to third fans 12, 13, and 14 may be placed spaced apart from each other. The first to third fans 12, 13, and 14 may be placed in order. The second fan 13 may be placed between the first fan 12 and the third fan 14. The second fan 13 may be placed in the center of the panel 11. The first fan 12 may be placed adjacent to the second fan 13 from the side plates of the first housing 20 and the second housing 30. The third fan 14 may be placed adjacent to the second fan 13 from the side plates of the first housing 20 and the second housing 30. The first fan 12 and the second fan 13, and the second fan 13 and the third fan 14 may be placed at the same distance apart.

[0038] The first assembly 200 can be placed in the first housing 20. The first housing 20 may include a top plate on which the first assembly 200 is placed, and two side plates extending vertically from both sides of the top plate. The first assembly 200 can house components that constitute the AC / DC converter section. The first assembly 200 can receive AC power from the grid, convert it to DC power, and output it to the second assembly 300.

[0039] The second assembly 300 can be placed in the second housing 30. The second housing 30 may include a bottom plate on which the second assembly 300 is placed, and two side plates extending vertically from both sides of the bottom plate. The second assembly 300 can house components that constitute the DC / DC converter section. The second assembly 300 can receive DC power from the first assembly 200, convert it into power suitable for battery charging, and output it to the battery.

[0040] The power converter 1000 can have a hexahedral shape overall, with the side plates of the first housing 20 and the second housing 30 joined together, and the fan module 10 positioned at the front. However, it is not limited to this, and the shape of the power converter 1000 can be varied in many ways. In the power converter 1000, the first assembly 200 and the second assembly 300 can be arranged facing each other. The components arranged in the first assembly 200 and the components arranged in the second assembly 300 can be arranged facing each other.

[0041] The first assembly 200 may be an assembly on which components constituting the AC / DC converter section are arranged on the first substrate 201. Components arranged on the first substrate 201 may include a first switch module 210, a first capacitor 220, an inductor 240, a support member 230, and may also include input terminals, an EMI filter, and the like.

[0042] The first switch module 210 can be positioned as close as possible to the fan module 10. The inductor 240 can be positioned behind the first switch module 210. Since the first switch module 210 and the inductor 240 are heat-generating components among the parts included in the first assembly 200, they can be positioned as close as possible to the fan module 10. Since the multiple fans included in the fan module 10 are arranged to be densely clustered in the central part, the heat-generating components included in the first assembly 200 can be positioned facing the fans located in the central part. This concentrates air circulation in the central part where the heat-generating components are located, thereby enhancing the heat dissipation effect.

[0043] A virtual X-ray can be defined connecting the center of the first fan 12 to the vent, a virtual Y-ray can be defined connecting the center of the second fan 13 to the vent, and a virtual Z-ray can be defined connecting the center of the third fan 14 to the vent. The first switch module 210 can overlap with at least two of the virtual X-ray, Y-ray, and Z-ray. Multiple inductors 240 can overlap with at least two of the virtual X-ray, Y-ray, and Z-ray. The first switch module 210 can be positioned to overlap with at least two fans in a first direction connecting the fan module 10 to the vent. Multiple inductors 240 can be positioned to overlap with at least two fans in a first direction connecting the fan module 10 to the vent.

[0044] First capacitors 220 can be placed on both sides of the first switch module 210. The first capacitors 220 can be arranged in multiple rows and can act as a barrier to concentrate airflow on the first switch module 210. For example, the first capacitors 220 can be arranged in two rows, but they can also be arranged in a crossing pattern.

[0045] Support members 230, which support the transformers 340 of the second assembly 300 (described later), can be positioned on both sides of the inductor 240. The coupling of the first housing 20 and the second housing 30 positions the transformers 340 of the second assembly 300 on both sides of the inductor 240, and the transformers 340 of the second assembly 300 can act as barriers to concentrate the airflow into the inductor 240.

[0046] Referring to Figures 6 and 7, the first switch module 210 may include a heat sink 211 and an element section 214. Although the heat sink 211 and the element section 214 have been described as one configuration forming the first switch module 210, the heat sink 211 and the element section 214 may each be separate configurations. The first switch module 210 can be formed with the same configuration as the second switch module 310 and the third switch module 320.

[0047] The first to third switching modules 210, 310, and 320 may have different numbers of components placed on the heatsink depending on their size. Since the configurations included in the first to third switching modules 210, 310, and 320 can be the same, the explanation of the second and third switching modules 310 and 320 will be omitted when describing the first switching module 210.

[0048] The heat sink 211 may include a base 212 on which an element portion 214 is arranged on one surface, and heat dissipation pins 213 that protrude from the other surface of the base 212. Multiple heat dissipation pins 213 can be formed parallel to each other to form a flow path through which air can flow into the recessed area. The flow path formed between the multiple heat dissipation pins 213 can be formed in a straight line from the fan module 10 to the vent. Multiple heat dissipation pins 213 can be formed extending in a first direction. Multiple heat dissipation pins 213 can be formed parallel to each other. Multiple grooves formed between the multiple heat dissipation pins 213 can be formed parallel to each other.

[0049] One side of the base 212 may include a spacer hole 217 into which a spacer 203 is coupled. The spacer 203 is positioned in the spacer hole 217 and can be secured by a pop nut 202 inserted from the outer surface of the first housing 20. The spacer 203 is positioned in the spacer hole 217 and can be secured by a screw inserted from the outer surface of the first substrate 201. The spacer 203 is positioned at the edge of one side of the base 212 and can support the first switch module 210.

[0050] When the first switch module 210 is placed on the first substrate 201, the spacer 203 can support the first switch module 210 such that a separation space is formed between one surface of the base 212 and the first substrate 201. Additional components can be placed in the separation space formed between one surface of the base 212 and the first substrate 201. Additional components can be placed in the separation space between one surface of the base 212 and the first substrate 201 where the element portion 214 is not placed.

[0051] The element section 214 can be arranged on one surface of the base 212. Multiple element sections 214 can be arranged on one surface of the base 212, spaced apart from each other. The element section 214 can include a frame and multiple switching elements mounted inside the frame. The frame of the element section 214 can be made of an insulating material. Various switching elements and rectifier diodes can be mounted on the element section 214. By arranging the switching elements included in the element section 214 within a frame made of an insulating material, an insulating distance can be ensured.

[0052] By arranging multiple element units 214 on a single heat sink 211, the heat generated by the element units 214 can be managed in an integrated manner. From the perspective of thermal management of the power converter 1000, it is more stable for the temperature of the entire element unit to be higher than for a single element unit to overheat. This has the effect of lowering the maximum heat generation temperature generated by multiple element units.

[0053] One side of the element portion 214 may include a plurality of pins 215 connected to the first substrate 201. Multiple switches of the element portion 214 can be electrically connected to the first substrate 201 via the plurality of pins 215. The element portion 214 may include coupling holes 216. The frame of the element portion 214 may include coupling holes 216. The element portion 214 can be coupled to the heat sink 211 via screws coupled to the coupling holes 216.

[0054] Referring to area P in Figure 16 and area Q in Figure 17, in the first direction connecting the fan module 10 and the vent, at least one structure 370 can be positioned on one or the other of the switching modules. At the switching module closest to the fan module 10, the structure can be positioned in the direction facing the fan module 10. At the switching module furthest from the fan module 10, the structure can be positioned in the direction facing the vent. Here, the structure may be an electronic component or element, for example, a film capacitor.

[0055] The structure 370 prevents air from flowing into the separation space between the base 212 and the first substrate 201, allowing air circulation by the fan module 10 to be concentrated on the heatsink 211. The height of the structure 370 from the first substrate 201 can be greater than the spacer 203 and less than the base 212. By appropriately arranging structures 370 of various heights, air circulation can be guided to concentrate on the switching module.

[0056] The second assembly 300 may be an assembly on which components constituting the DC / DC converter section are arranged on the second substrate 301. Components arranged on the second substrate 301 may include a second switch module 310, a third switch module 320, a fourth switch module 330, a transformer 340, a second capacitor 350, a heat-generating component 360, and a structure 370.

[0057] The second switch module 310 can be positioned as close as possible to the fan module 10. A third switch module 320 can be positioned behind the second switch module 310. A heat-generating component 360 can be positioned between the second switch module 310 and the third switch module 320. Here, the heat-generating component 360 may be a resonant inductor. A fourth switch module 330 can be positioned behind the third switch module 320.

[0058] The second to fourth switching modules 310, 320, and 330 are heat-generating components among the parts included in the second assembly 300, and therefore can be placed adjacent to the fan module 10. Since the multiple fans included in the fan module 10 are arranged to be densely clustered in the central part, the heat-generating components included in the second assembly 300 can be positioned facing the fans located in the central part. This allows for concentrated air circulation in the central part where the heat-generating components are located, thereby enhancing the heat dissipation effect.

[0059] The second switch module 310, the third switch module 320, and the heat-generating component 360 can overlap with at least two virtual X-rays, Y-rays, and Z-rays. The fourth switch module 330 can overlap with at least one virtual X-ray, Y-ray, and Z-ray. The second switch module 310, the third switch module 320, and the heat-generating component 360 can be arranged to overlap with at least two fans in a first direction connecting the fan module 10 and the vent. The fourth switch module 330 can be arranged to overlap with at least one fan in a first direction connecting the fan module 10 and the vent.

[0060] The second to fourth switching modules 310, 320, and 330 can be arranged so that they overlap each other in the first direction. Each different switching module can be arranged so that they do not overlap in the second direction perpendicular to the first direction. The closer the second to fourth switching modules 310, 320, and 330 are to the fan module 10, the larger the heatsink can be. When the second switch module 310, third switch module 320, and fourth switch module 330 are arranged in order from the fan module 10, the heatsink of the second switch module 310 can be larger than that of the third switch module 320, and the heatsink of the third switch module 320 can be larger than that of the fourth switch module 330. This enhances the heat dissipation effect of the heat generated by each switching module.

[0061] Second capacitors 350 can be placed on both sides of the second switch module 310. The second capacitors 350 can be arranged in multiple rows and act as a barrier to concentrate airflow on the second switch module 310. For example, the second capacitors 350 can be arranged in two rows, but they can also be arranged in an intersecting pattern. Transformers 340 can be placed on both sides of the third switch module 320. With respect to the second substrate 301, the height of the transformers 340 is formed to be higher than the height of the third switch module 320 and act as a barrier to concentrate airflow on the third switch module 320.

[0062] At least one of the first to fourth switching modules 210, 310, 320, and 330 can be positioned on a virtual line that bisects the substrate in a second direction perpendicular to the first direction connecting the fan module 10 and the vent. At least one of the first to fourth switching modules 210, 310, 320, and 330 can be positioned on a virtual Y-line connecting the fan located at the center of the fan module 10 to the vent. At least one of the first to fourth switching modules 210, 310, 320, and 330 can be positioned in the central part of the substrate. This prevents weight imbalance of the power converter 1000 and ensures sufficient area for circuit connection by symmetrical circuit arrangement. Furthermore, it is possible to increase vortex flow to enhance heat dissipation and prevent imbalance in heat dissipation flow.

[0063] Figure 14 is a cross-sectional view taken from line A in Figure 13, and Figure 15 is a cross-sectional view taken from line B in Figure 13. The heat-generating components included in the power converter 1000 are located in the central part, and components other than the heat-generating components can be arranged in a symmetrical structure vertically or horizontally with respect to the heat-generating components.

[0064] In the cross-sectional view of Figure 14, the first switch module 210 and the second switch module 310 can be arranged facing each other, and the first capacitor 220 and the second capacitor 350 can be arranged facing each other. The first capacitor 220 and the second capacitor 350 can be arranged in contact with each other, minimizing the space between them. The first capacitor 220 and the second capacitor 350 can be arranged in close proximity, minimizing the space between them. As a result, the first capacitor 220 and the second capacitor 350 act as a barrier, guiding the air circulation to concentrate in the grooves between the heat dissipation pins of the first switch module 210 and the grooves between the heat dissipation pins of the second switch module 310 when the fan module 10 is operating.

[0065] In the cross-sectional view of Figure 15, the third switch module 320 and the inductor 240 are arranged facing each other, and transformers 340 can be positioned on both sides of the third switch module 320 and the inductor 240, respectively. A separation space can be formed between the third switch module 320 and the inductor 240. The size of the transformer 340 can be formed to correspond to the distance between the first substrate 201 and the second substrate 301. As a result, the transformer 340 acts as a barrier, guiding the air circulation when the fan module 10 is operating to concentrate in the groove between the heat dissipation pins of the third switch module 320 and in the separation space between the third switch module 320 and the inductor 240.

[0066] Referring to Figures 8 and 9, the fourth switch module 330 may include a heat sink 331, a pad 334, an element section 335, and a terminal section 335. The fourth switch module 330 may also be an O-ring diode connected to the output capacitor.

[0067] The heat sink 331 may include a base 332 on which an element portion 335 is arranged on one surface, and heat dissipation pins 333 that protrude from the other surface of the base 332. The heat sink 331 can be called a heat sink. Multiple heat dissipation pins 333 can be formed parallel to each other to form a flow path through which air can flow into the recessed area. The flow path formed between the multiple heat dissipation pins 333 can be formed in a straight line from the fan module 10 to the vent. Multiple flow paths formed between the multiple heat dissipation pins 333 can be formed parallel to each other.

[0068] A pad 334 can be placed between the base 332 and the element portion 335. The pad 334 may be an insulating pad. The element portion 335 can be placed on the pad 334. Various switching elements and O-ring diodes can be mounted on the element portion 335. The element portion 335 can be case-shaped and can have various switching elements and O-ring diodes mounted inside. One side of the element portion 335 may include a terminal portion 336 connected to the first substrate 201. The element portion 335 may include a plurality of protruding portions, and the terminal portion 336 can be placed on the plurality of protruding portions. The element portion 335 may include coupling holes. The element portion 335 can be coupled to the heat sink 331 via screws (S) coupled to the coupling holes.

[0069] The transformer 340 may include a core 341, a coil 342, and a bobbin 343.

[0070] The bobbin 343 may have a hollow shape and may include an upper part 3441, a middle part 3451, and a lower part 3461. A coil 342 may be wound in the middle part 3451. The coil 342 may include a primary coil wound in the middle part 3451 and a secondary coil wound around the primary coil. The coil 342 may include a primary coil wound in the middle part 3451 and adjacent to the upper part 3441, and a secondary coil wound adjacent to the lower part 3461. The core 341 may include an upper core formed to enclose the upper part 3441 and the coil 342 of the bobbin 343, and a lower core formed to enclose the lower part 3461 and the coil 342. The upper core and the lower core may be separate or a single configuration.

[0071] The upper part 3441 of the bobbin 343 may include an upper surface that contacts the core 341. The bobbin 343 may include a projection 3442 that protrudes outward from the upper surface. The bobbin 343 may include a projection 3442 that extends outward from the upper surface.

[0072] The lower surface of the projection 3442 can face the coil 342. The projection 3442 can overlap the coil 342 from top to bottom. The projection 3442 may include two projections 3442 protruding from the guide wall 3444. A fixing groove 3443 can be formed between the two projections 3442. The fixing groove 3443 can serve to support the wire terminals extending from the coil 342 so that they are locked and secured.

[0073] The outer surface of the protrusion 3442 can be formed in a rounded shape. The outer surface of the protrusion 3442 can be formed in a chamfered shape. The protrusion 3442 can be formed inward from the recessed portion 3462 of the lower part 3461 of the bobbin 343. The hole 3463 of the recessed portion 3462 can not overlap with the protrusion 3442 from top to bottom. This prevents interference by the protrusion 3442 when screw (S) is connected to the hole 3463 of the recessed portion 3462 from top to bottom.

[0074] The bobbin 343 may include a guide wall 3444 formed between its top surface and the protruding portion 3442. The bobbin 343 may include a guide wall 3444 projecting upward between its top surface and the protruding portion 3442. The guide wall 3444 can be formed between its top surface and the protruding portion 3442. The inner surface of the guide wall 3444 may be in contact with the core 341. The inner surface of the guide wall 3444 may face the core 341. The guide wall 3444 may serve to support the outer surface of the core 341 in order to prevent the core 341 from moving or detaching.

[0075] The lower part 3461 of the bobbin 343 may include a recessed portion 3462 formed on the underside at the end. The lower part 3461 of the bobbin 343 may include a recessed portion 3462 formed on the underside at the corner. A hole 3463 can be formed in the recessed portion 3462 that penetrates through it. A screw (S) can be coupled to the hole 3463 formed in the recessed portion 3462, and the screw (S) can be coupled to a pop nut 302 located on the second substrate 301 and the second housing 30.

[0076] This allows the transformer 340 to be fixedly coupled to both the second substrate 301 and the second housing 30. Since the transformer 340 is a large and heavy component among the parts placed in the second assembly 300, fixing it only to the second substrate 301 could cause warping of the second substrate 301, potentially damaging the components placed on the second substrate 301. Therefore, by doubly fixing the transformer 340 to both the second substrate 301 and the second housing 30, the transformer 340 can be stably positioned.

[0077] The lower part 3461 of the bobbin 343 may include a guide groove 3464 formed on the opposite side of the protrusion 3442 of the upper part 3441. The lower part 3461 of the bobbin 343 may also include a guide groove 3464 formed between two recessed parts 3462 of adjacent corners. The guide groove 3464 may include a plurality of guide grooves 3464 spaced apart from each other. The guide groove 3464 may overlap with the coil 342. The guide groove 3464 may be formed to facilitate the winding operation of the coil 342.

[0078] The support member 230, which is positioned in the first assembly 200, can be positioned to contact the transformer 340. The support member 230 can be positioned to contact the upper core 341 of the transformer 340. The support member 230 is positioned to contact the transformer 340 and can prevent upward movement of the transformer 340 and vertical vibration of the transformer 340.

[0079] The support member 230 may include a first pad 231 placed in the first assembly 200 and a second pad 232 placed on the first pad 231. The first pad 231 may be made of plastic or silicone material. The second pad 232 may be made of elastic or sponge material. The first pad 231 may include a hole that penetrates it. The support member 230 can be fixed to the first assembly 200 by screwing into the hole in the first pad 231. The screw in the hole in the first pad 231 can be fixed by coupling with a pop nut 202 inserted into the first housing 20. The hole in the first pad 231 may be formed in a chamber shape. The screw placed in the first pad 231 may be positioned inside the hole so as not to protrude outward from the first pad 231. The second pad 232 can be bonded onto the first pad 231. Adhesive can be placed between the first pad 231 and the second pad 232.

[0080] Those with ordinary skill in the art related to this embodiment will understand that it can be embodied in modified forms that do not deviate from the essential characteristics described above. Therefore, the disclosed method should be considered in an explanatory rather than restrictive view. The scope of the invention is shown in the claims, not in the foregoing description, and all differences within the same scope should be construed as being included in the invention.

Claims

1. Bobbin containing a hollow core; The coil wound on the bobbin; and It includes a core that is arranged to enclose the coil and the bobbin, The bobbin includes an upper part, a lower part, and a central part between the upper part and the lower part on which the coil is wound. A transformer in which a hole is formed in the lower part of the bobbin.

2. The lower part of the bobbin includes a recessed portion in which the hole is formed. The transformer according to claim 1, wherein the recessed portion includes a plurality of recessed portions formed at intervals from the lower end of the bobbin.

3. The upper part of the bobbin includes an upper surface facing the core and a projection that protrudes outward from the upper surface. The transformer according to claim 1, wherein the protruding portion overlaps with the coil from the upper part toward the lower part.

4. The transformer according to claim 3, wherein the hole does not overlap with the protruding portion in the direction from the upper part to the lower part.

5. The upper part of the bobbin includes a guide wall that is formed to protrude between the upper surface and the protruding portion. The inner surface of the guide wall faces the core, as described in claim 1.

6. Housing 1; A first substrate disposed in the first housing; and The first substrate includes a transformer, The aforementioned Transformer is Bobbin containing a hollow core; The coil wound on the bobbin; and It includes a core that is arranged to enclose the coil and the bobbin, The bobbin includes an upper part, a lower part, and a central part between the upper part and the lower part on which the coil is wound. The transformer is a power conversion device in which a screw is positioned in a hole formed in the lower part of the bobbin and is coupled to the first housing.

7. A fixing member is inserted into the first housing from the outside to the inside. The power conversion device according to claim 6, wherein the screw positioned in the hole of the bobbin is coupled to the fixing member.

8. A second housing coupled to the first housing; and The second housing includes a second substrate, The power conversion device according to claim 6, wherein the second substrate includes a support member positioned at a location corresponding to the transformer.

9. The support member includes a first pad disposed on the second substrate and a second pad disposed on the first pad. The power conversion device according to claim 8, wherein the second pad is made of an elastic material or a sponge material.

10. The upper part of the bobbin includes an upper surface facing the core and a projection that protrudes outward from the upper surface. The power conversion device according to claim 6, wherein the protruding portion overlaps with the coil from the upper part toward the lower part.

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