CN118285050A - Converter - Google Patents

Abstract

A converter, comprising: a housing; an electronic component disposed within the housing; and a heat radiating fin protruding from an outer surface of the housing, wherein the heat radiating fin includes: a plurality of first heat radiating fins arranged to be spaced apart from each other; and a plurality of second heat radiating fins arranged to be spaced apart from each other and arranged between the plurality of first heat radiating fins adjacent to each other, and wherein a length of the first heat radiating fins is longer than a length of the second heat radiating fins based on a first direction.

Description

Converter

Technical Field

The present embodiment relates to a converter.

Background

Engine electrical devices (starting devices, ignition devices, and charging devices) and lighting devices are common as automotive electrical devices, but most systems (including chassis electrical devices) have recently become electrically-electronic as vehicles have become more electronically controlled.

Various electric components (e.g., a lamp, an audio system, a heater, and an air conditioner) installed in an automobile are designed to receive electric power from a battery when the automobile is stopped and electric power from a generator when the automobile is driven, and at this time, the power generation capability of a 14V power system is used as a normal power supply voltage.

In recent years, with the development of the information technology industry, vehicles are adopting various new technologies (motor-driven power steering, the internet, etc.) aimed at enhancing the convenience of automobiles, and in the future, development of new technologies capable of maximally utilizing the current automobile systems is expected to continue.

Hybrid vehicles (HEVs), whether soft or hard, are equipped with a DC-DC converter (low voltage DC-DC converter) for powering an electrical load (12V). Further, a DC-DC converter, which is a generator (alternator) of a general gasoline vehicle, supplies a voltage of 12V to an electric load by reducing the high voltage of a main battery (typically, a high-voltage battery of 144V or higher).

DC-DC converters refer to electronic circuit devices that convert DC power of a certain voltage into DC power of another voltage, and are used in various fields such as television receivers and electric parts of automobiles.

Inside the converter, a plurality of electrical components that generate heat due to driving are arranged. In general, heat dissipation of the converter may be achieved by disposing one or more heat dissipation fins on an outer surface of the case forming an external shape. In other words, it is a structure that: wherein heat generated from the electrical component is conducted to the outside through the housing and dissipated to the outside through the heat dissipation fins.

However, considering that the heat generated from each electronic component is different, and the overall weight of the converter may increase due to the arrangement area of the heat radiating fins, there is a difficulty in designing the heat radiating structure.

Disclosure of Invention

[ Technical subject ]

The present embodiment aims to provide a converter capable of improving heat dissipation efficiency and reducing weight.

Technical scheme

The converter according to the present embodiment includes: a housing; an electronic component disposed within the housing; and a heat radiating fin protruding from an outer surface of the housing, wherein the heat radiating fin includes: a plurality of first heat radiating fins arranged to be spaced apart from each other; and a plurality of second heat radiating fins arranged to be spaced apart from each other and arranged between the plurality of first heat radiating fins adjacent to each other, and wherein a length of the first heat radiating fins is greater than a length of the second heat radiating fins based on a first direction.

The outer surface of the housing includes: a first region in which the first heat radiating fins are arranged; and a second region at which the first heat radiating fin and the second heat radiating fin are arranged, wherein a length of the second region is equal to or less than 1/2 of a sum of a length of the first region and a length of the second region.

A first gap is formed between adjacent ones of the plurality of first heat radiating fins in the first region, a second gap is formed between the first heat radiating fin and the second heat radiating fin in the second region, and the first gap may be larger than the second gap.

A third gap is formed between the two first heat radiating fins arranged at the center based on a second direction perpendicular to the first direction, and the third gap may be larger than the first gap.

On a side surface of the housing, a bracket is disposed, which protrudes outward and includes a coupling hole, and may include a rib: the rib connects the bracket and the first heat radiating fin or connects the bracket and the second heat radiating fin.

The rib may have a shape protruding from a surface of the case.

The first heat dissipation fin includes: a first guide region having one end disposed adjacent to one side surface of the housing; and a first heat dissipation area connected to the first guide area and having one end disposed adjacent to the other side surface of the housing, wherein an inclined surface may be disposed on a surface of the first guide area, the inclined surface having a shape such that a height protruding from an outer surface of the housing increases as the inclined surface approaches the first guide area.

The second heat dissipation fin includes: a second guide region, one end of the second guide region being disposed adjacent one end of the second region; and a second heat dissipation area connected to the second guide area and having one end disposed adjacent to the other end of the second area, wherein an inclined surface having a shape such that a height protruding from an outer surface of the housing increases as the inclined surface approaches the second heat dissipation area may be disposed on a surface of the second guide area.

A connection portion may be disposed between the first guide region and the first heat dissipation region, the connection portion having a larger cross-sectional area than other regions.

A converter according to another embodiment includes: a first housing; a second housing disposed at a lower portion of the first housing; an electronic component disposed between the first housing and the second housing; and a heat radiating fin protruding downward from a lower surface of the second housing, wherein the heat radiating fin includes: a plurality of first heat radiating fins arranged to be spaced apart from each other; a plurality of second heat radiating fins arranged to be spaced apart from each other and arranged between a plurality of adjacent first heat radiating fins, and wherein a lower surface of the second housing includes: a first region in which the first heat radiating fins are arranged; and a second region in which the first heat radiating fin and the second heat radiating fin are arranged.

[ Advantageous effects ]

The present embodiment has an advantage in that by forming a plurality of heat dissipation areas having an arrangement structure of heat dissipation fins of different lengths, heat dissipation efficiency can be improved in an area where heat generation is concentrated, while the weight of the converter can be reduced.

Drawings

Fig. 1 is a perspective view showing an upper surface of a transducer according to a first embodiment of the present invention.

Fig. 2 is a perspective view showing a lower surface of a transducer according to a first embodiment of the present invention.

Fig. 3 is a view showing fig. 2 from another angle.

Fig. 4 is a plan view showing a side surface of a transducer according to a first embodiment of the present invention.

Fig. 5 is an exploded perspective view of a transducer according to a first embodiment of the present invention.

Fig. 6 is a plan view showing the lower surface of the transducer according to the first embodiment of the present invention.

Fig. 7 is a plan view showing the lower surface of the transducer according to the second embodiment of the present invention.

Fig. 8 is a table comparing the heat dissipation efficiency of the converter according to the second embodiment of the present invention with that of the converter according to the first embodiment of the present invention.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical idea of the present invention is not limited to some embodiments to be described, but may be implemented in various forms, and one or more constituent elements may be selectively combined or replaced between the embodiments within the scope of the technical idea of the present invention.

Further, unless explicitly defined and described, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as meanings commonly understood by those skilled in the art, and commonly used terms, such as terms defined in dictionaries, may be interpreted in consideration of the meanings of the context of the related art.

Furthermore, the terminology used in the description of the embodiments is for the purpose of describing the embodiments only and is not intended to be limiting of the invention.

In this specification, the singular form may include the plural form unless specifically stated in the phrase, and when described as "at least one (or more than one) of a and B and C," it may include one or more of all combinations that may be combined with A, B and C.

In addition, in describing components of embodiments of the present invention, terms such as "first," "second," A, B, (a), and (b) may be used. These terms are only used to distinguish one element from another element and do not limit the nature, order, or sequence of the elements.

Also, when an element is described as being "connected," "coupled," or "interconnected" to another element, the element is not only directly connected, coupled, or interconnected to the other element, but also may include the case where there is yet another element between the element and the other element.

In addition, when described as being formed or arranged in "upper (above)" or "lower (below)" of each component, the "upper (above)" or "lower (below)" is meant to include not only the case where the two components are in direct contact but also the case where one or more other components are formed or arranged between the two components. Further, when expressed as "upper (upper)" or "lower (lower)", not only the upward direction but also the meaning based on the downward direction of one component may be included.

Fig. 1 is a perspective view showing an upper surface of a transducer according to a first embodiment of the present invention; fig. 2 is a perspective view showing a lower surface of a transducer according to a first embodiment of the present invention;

FIG. 3 is a view from another angle showing FIG. 2; fig. 4 is a plan view showing a side surface of a transducer according to a first embodiment of the present invention; fig. 5 is an exploded perspective view of a transducer according to a first embodiment of the present invention; and fig. 6 is a plan view showing the lower surface of the transducer according to the first embodiment of the present invention.

Referring to fig. 1 to 6, the external shape of the converter 10 according to the first embodiment of the present invention may be formed by coupling the first case 100 and the second case 200. The first housing 100 and the second housing 200 may be coupled in the up-down direction. The first and second cases 100 and 200 may include screw holes formed in corresponding regions, and may be coupled together by screws.

The first housing 100 may be disposed at an upper portion of the second housing 200. A protruding region 110 protruding more upward than other regions may be disposed at the upper surface of the first housing 100. A groove recessed more upward than other areas may be formed on a lower surface of the first housing 100 facing the protruding area 110. At least a portion of the electronic component 310 in the printed circuit board 300, which will be described later, may be disposed within the recess. The first housing 100 may be referred to as a cover because it covers the upper portions of the components within the transducer 10.

The second housing 200 may be disposed at a lower portion of the first housing 100. The second housing 200 may include an upper surface facing the first housing 100 and a lower surface facing the upper surface. The second housing 200 may be referred to as a base because it supports the components within the transducer 10 at a lower portion.

The first case 100 and the second case 200 may be formed of a metal material.

The second housing 200 may include a bracket 210 for coupling the converter 10 to an arrangement region of the converter 10. The bracket 210 may have an end portion protruding more outwardly than a side surface of the first case 100 or the second case 200. The bracket 210 may include: a leg portion 212 protruding downward from a lower surface of the second housing 200; and a coupling portion 214, the coupling portion 214 protruding outwardly from a lower end of the leg portion 212. The leg portions 212 may be arranged obliquely such that the distance from the side surface of the first housing 100 or the side surface of the second housing 200 increases as it travels downward. The coupling portion 214 is disposed parallel to the first housing 100 or the second housing 200, and may include a coupling hole 215 penetrating from the upper surface to the lower surface. Thus, the screw passing through the coupling hole 215 is screw-coupled to the mounting surface of the converter 10 so that the converter 10 can be fixed to the mounting surface.

The brackets 210 may be provided in plurality and arranged to be spaced apart from each other. For example, three brackets 210 are provided, one bracket being disposed on one side surface of the second housing 200, and two brackets may be disposed on the other side surface of the second housing 200 facing the one side surface. In this case, the bracket 210 disposed on one side surface and the bracket 210 disposed on the other side surface may be disposed not to overlap each other.

A groove 202 recessed more than other areas may be formed on the upper surface of the second housing 200. A heat sink material having high thermal conductivity may be applied to the groove 202. Or at least a part of an electronic component to be described later, which is disposed on the surface of the printed circuit board 300, may be disposed in the groove 202.

Meanwhile, in the present embodiment, the first housing 100 is disposed at an upper portion, the second housing 200 is disposed at a lower portion, but not limited thereto, the second housing 200 may be disposed at an upper portion, and the first housing 100 may be disposed at a lower portion. Further, the first housing 100 and the second housing 200 may be formed as one body, not in a separable configuration from each other.

Electronic components for driving the converter 10 may be disposed in an inner space of the converter 10 formed by the coupling of the first and second housings 100 and 200. As an example, the printed circuit board 300 may be disposed in the inner space. The printed circuit board 300 is formed in a plate shape, and the electronic parts 310 and 330 may be disposed on at least one of the upper and lower surfaces. The electronic components 310 and 330 may generate heat when they are driven. The electronic components 310 and 330 may include: a transformer for voltage regulation; an inductor 310 for inductance; and one or more FET elements 330.

The heat dissipation pad 400 may be disposed at a lower portion of the printed circuit board 300 in the inner space. The heat sink pad 400 is made of a material having high thermal conductivity and may have a plate shape. The upper surface of the heat dissipation pad 400 may be in contact with the lower surface of the printed circuit board 300, and the lower surface of the heat dissipation pad 400 may be in contact with the upper surface of the second case 200. Accordingly, heat generated from the electronic components 310 and 330 within the printed circuit board 300 may be transferred to the second case 200 through the heat dissipation pad 400.

Hereinafter, a heat dissipation structure of the converter 10 will be described.

The converter 10 may include heat dissipating fins. The heat radiating fins may be formed to protrude downward from the lower surface of the second case 200. The heat radiating fins can improve heat radiating efficiency by increasing the cross-sectional area of the outer surface of the converter 10. The heat dissipation fins may be arranged to overlap the electronic components 310 and 330 in the up-down direction.

The length direction of the heat radiating fin may be defined as the following direction: this direction is directed from one side surface of the second housing 200 where one bracket 210 of the plurality of brackets 210 is arranged toward the other side surface of the second housing 200 where two brackets 210 of the plurality of brackets 210 are arranged. Hereinafter, the length direction of the heat radiating fin (i.e., the direction connecting one side surface and the other side surface of the second case 200) will be defined and described as a first direction.

The heat radiating fins may include a plurality of first heat radiating fins 230 and a plurality of second heat radiating fins 250. At least some of the plurality of first heat radiating fins 230 may be disposed between adjacent second heat radiating fins 250. The plurality of second heat radiating fins 250 may be disposed between adjacent first heat radiating fins 230. The length of the first heat radiating fin 230 in the first direction may be longer than the length of the second heat radiating fin 250 in the first direction. The length of the second heat radiating fin 250 in the first direction may be less than or equal to 1/2 of the length of the first heat radiating fin 230 in the first direction. The length of the second heat radiating fin 250 in the first direction may be less than 1/2 of the length of the second case 200 in the first direction.

As shown in fig. 6, the lower surface of the second housing 200 may be divided into: a first region a adjacent to one side surface of the second case 200, and in which only the first heat radiating fins 230 are disposed; and a second region B adjacent to the other side surface of the second case 200, and in which the first heat radiating fins 230 and the second heat radiating fins 250 are disposed together. The length of the second region B in the first direction may be equal to or less than 1/2 of the sum of the lengths of the first region a and the second region B in the first direction. The second region B may be arranged to overlap the FET element 330 in the up-down direction.

The first heat radiating fins 230 may be provided in plurality and arranged to be spaced apart from each other. A first gap 270 may be formed between adjacent first heat radiating fins 230 in the first region a. A second gap 290 may be formed between the first heat radiating fin 230 and the second heat radiating fin 250 in the second region B. At least one of the gaps between the plurality of first heat radiating fins 230 may have a different length from other gaps. For example, as shown in fig. 2 and 6, a third gap 280 is formed between two first heat radiating fins 230 located at the center based on a second direction perpendicular to the first direction, and the third gap 280 may be formed to be larger than the first gap 270 or the second gap 290. Each of the two first heat radiating fins 230 arranged at the center based on the second direction may be connected to the leg 212 of the bracket 210.

The first heat dissipation fin 230 may include a first guide region 232 and a first heat dissipation region 234. One end of the first guide region 232 may be disposed adjacent to one side surface of the second housing 200. One end of the first heat dissipation area 234 may be disposed adjacent to the other side surface of the second case 200. The first inclined surface 233 may be formed on the lower surface of the first guide region 232 in a shape such that a height protruding from the lower surface of the second case 200 increases as it approaches the first heat dissipation region 234. Accordingly, the air flowing in from one side surface of the second case 200 can be easily guided to the region where the heat radiating fins are arranged.

A connection portion 237 (see fig. 6) having a larger cross-sectional area than other regions may be formed between the first guide region 232 and the first heat dissipation region 234. Accordingly, in the connection region between the first guide region 232 and the first heat dissipation region 234, strength may be increased. The connection portion 237 may be provided in plurality, and may be disposed in one region between one end and the other end of the first heat dissipation region 234.

The first heat radiating fin 230 may be connected to the bracket 210. The first heat radiating fin 230 may be connected to the leg 212 of the bracket 210. The second case 200 may include ribs 219 protruding downward from the lower surface and connecting the leg 212 and the first heat radiating fins 230. The rib 219 may have a thickness greater than that of the first heat radiating fin 230. By connecting the first heat radiating fin 230 and the bracket 210, the strength of the first heat radiating fin 230 can be enhanced.

The second heat radiating fins 250 may be provided in plurality and arranged to be spaced apart from each other. The second heat radiating fins 250 may be disposed in the second region B. The second heat radiating fins 250 may be disposed between adjacent first heat radiating fins 230. A second gap 290 may be formed between the second heat radiating fin 250 and the adjacent first heat radiating fin 230. The second gap 290 may be smaller than the first gap 270 or the third gap 280.

The second heat dissipation fin 250 may include a second guide region 252 and a second heat dissipation region 254. One end of the second guide region 252 is adjacent to one end of the second region B, and one end of the second heat dissipation region 254 may be adjacent to the other end of the second region B. The second inclined surface may be formed on the lower surface of the second guide region 252 in a shape such that the height protruding from the lower surface of the second housing 200 increases as it approaches the second heat dissipation region 254. Therefore, the air passing through the first region a can be easily guided to the second region B.

The second heat radiating fin 250 may be connected to the bracket 210. The second heat radiating fin 250 may be connected to the leg 212 of the bracket 210. The second case 200 may include ribs 219 protruding downward from the lower surface and connecting the leg 212 and the second heat radiating fins 250. The thickness of the rib 219 may be greater than the thickness of the second heat radiating fin 250. By connecting the second heat radiating fin 250 and the bracket 210, the strength of the second heat radiating fin 250 can be enhanced.

Based on the second direction, two second heat radiating fins 250 may be arranged between two first heat radiating fins 230 provided at the center. In this case, the first heat radiating fin 230 may not be disposed between the two second heat radiating fins 250. In other words, two second heat radiating fins 250 may be disposed in the third gap 280. Therefore, the center of gravity of the transducer 10 can be formed uniformly with respect to the center.

As shown in fig. 4, the lower surface of the bracket 210 and the lower surface of the heat radiating fin may be arranged to be stepped from each other. The lower surface of the bracket 210 may be disposed lower than the lower surface of the heat radiating fin.

With the above-described structure, a plurality of heat dissipation areas are formed by arranging the heat dissipation fins of different lengths, which has the advantage of "improving the heat dissipation efficiency in the area where heat generation is concentrated, while reducing the weight of the converter".

Fig. 7 is a plan view showing a lower surface of a transducer according to a second embodiment of the present invention; fig. 8 is a table comparing heat dissipation efficiency of a converter according to a second embodiment of the present invention with that of a converter according to a first embodiment of the present invention.

The present embodiment is otherwise identical to the first embodiment except that guide fins are added at the edges of the region where the heat radiating fins are formed. Therefore, hereinafter, only the characteristic portion of the present embodiment will be described, and the description of the first embodiment will be cited as a reference to the remaining portion.

Referring to fig. 7 and 8, according to the present embodiment, guide fins 260 may be disposed on the outer surface of the second housing 200. The guide fins 260 may be disposed outside the first and second heat radiating fins 230 and 250. When the region where the first and second heat dissipation fins 230 and 250 are formed on the outer surface of the second case 200 is referred to as a heat dissipation region, the guide fins 260 may form a boundary of the heat dissipation region. The guide fins 260 may be provided in plurality and may be disposed at both sides of the heat dissipation area, respectively. The guide fins 260 may be provided in plurality and arranged to be spaced apart from each other in the first direction. The first heat radiating fin 230 and the second heat radiating fin 250 may be disposed inside the plurality of guide fins 260. A plurality of guide fins 260 may be disposed adjacent to both sides of the lower surface of the second housing 200, respectively.

The protruding height of the guide fins 260 from the outer surface of the second housing 200 is the protruding height of the first heat radiating fins 230 from the outer surface of the second housing 200 or the outer surface of the second housing 200, and may be formed to be greater than the protruding height of the second heat radiating fins 250.

The guide fin 260 is formed in a plate shape and may be disposed perpendicular to the lower surface of the second housing 200.

The length of the guide fin 260 may correspond to the length of the first heat dissipation fin 230 or may be formed to be longer based on the second direction perpendicular to the first direction. Based on the length direction of the guide fin 260, one end of the guide fin 260 is disposed to form the same height as one end of the first heat radiating fin 230, and the other end of the guide fin 260 may be disposed to form the same height as the other end of the first heat radiating fin 230 or the other end of the second heat radiating fin 250.

According to the above structure, the air flow flowing through the heat dissipation area is guided by the guide fins 260, so that there is an advantage in that the heat dissipation efficiency can be further improved. As shown in fig. 8, it can be confirmed that the heat radiation effect is superior to that of the converter according to the first embodiment due to the air guide structure realized by the guide fins 260.

Further, since the heat dissipation area and the other area are separated by the guide fins 260, a space within the heat dissipation area can be protected from the other area, and a degree of freedom in design regarding the arrangement of the plurality of heat dissipation fins within the heat dissipation area can be increased.

Meanwhile, since the guide fins 260 are disposed at the outermost portion of the heat dissipation area, they may also be referred to as outermost fins.

In the above description, it is described that all the components constituting the embodiment of the present invention are combined or operated in one embodiment, but the present invention is not necessarily limited to these embodiments. In other words, all components may be selectively operated in combination with one or more components within the scope of the present invention. In addition, the foregoing terms "comprising," "including," or "having" mean that the corresponding elements may be inherent to the corresponding element unless expressly specified otherwise, and therefore should be understood to not exclude other elements but also include other elements. Unless otherwise defined, all terms (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. Unless explicitly defined in the present invention, terms commonly used (e.g., terms defined in a dictionary) should be construed as consistent with the context of the related art and should not be interpreted in an ideal or excessively formal sense.

The above description is merely illustrative of the technical idea of the present invention, and various modifications and adaptations can be made by those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are intended to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of the present invention should be construed by the appended claims, and all technical ideas within the equivalent scope should be construed to be included in the scope of the present invention.

Claims (10)

1.A converter, comprising:

A housing;

An electronic component disposed within the housing; and

A heat radiating fin protruding from an outer surface of the housing,

Wherein the heat radiating fins include a plurality of first heat radiating fins arranged to be spaced apart from each other and a plurality of second heat radiating fins arranged to be spaced apart from each other and arranged between the plurality of first heat radiating fins adjacent to each other, and

Wherein, based on the first direction, the length of the first radiating fin is longer than the length of the second radiating fin.

2. The converter according to claim 1,

Wherein the outer surface of the housing includes a first region in which the first heat radiating fins are arranged and a second region in which the first heat radiating fins and the second heat radiating fins are arranged, and

Wherein the length of the second region is equal to or less than 1/2 of the sum of the length of the first region and the length of the second region.

3. A converter according to claim 2,

Wherein first gaps are formed between adjacent ones of the plurality of first heat radiating fins in the first region,

Wherein a second gap is formed between the first heat radiating fin and the second heat radiating fin in the second region, and

Wherein the first gap is larger than the second gap.

4. A converter according to claim 3,

Wherein a third gap is formed between two of the first heat radiating fins arranged at the center based on a second direction perpendicular to the first direction, and

Wherein the third gap is greater than the first gap.

5. The converter according to claim 1,

Wherein a bracket is arranged on a side surface of the housing, the bracket protrudes outward and includes a coupling hole, and

Wherein ribs are included that connect the bracket and the first heat radiating fin or connect the bracket and the second heat radiating fin.

6. A converter according to claim 5,

Wherein the rib has a shape protruding from a surface of the housing.

7. The converter according to claim 1,

Wherein the first heat dissipation fin includes a first guide region having one end disposed adjacent to one side surface of the housing and a first heat dissipation region connected to the first guide region and having one end disposed adjacent to the other side surface of the housing, and

Wherein an inclined surface is arranged on a surface of the first guide region, the inclined surface having a shape such that a height protruding from an outer surface of the housing increases as the inclined surface approaches the first guide region.

8. A converter according to claim 2,

Wherein the second heat dissipation fin includes a second guide region and a second heat dissipation region, one end of the second guide region being disposed adjacent to one end of the second region, the second heat dissipation region being connected to the second guide region, and one end of the second heat dissipation region being disposed adjacent to the other end of the second region, and

Wherein an inclined surface is arranged on a surface of the second guide region, the inclined surface having a shape such that a height protruding from an outer surface of the housing increases as the inclined surface approaches the second heat dissipation region.

9. The converter according to claim 7,

Wherein a connecting portion having a larger cross-sectional area than other regions is arranged between the first guide region and the first heat dissipation region.

10. A converter, comprising:

a first housing;

A second housing disposed at a lower portion of the first housing;

an electronic component disposed between the first housing and the second housing; and

A heat radiating fin protruding downward from a lower surface of the second housing,

Wherein the heat radiating fins include a plurality of first heat radiating fins arranged to be spaced apart from each other and a plurality of second heat radiating fins arranged to be spaced apart from each other and arranged between a plurality of adjacent first heat radiating fins, and

Wherein the lower surface of the second housing includes a first region in which the first heat radiating fins are arranged and a second region in which the first heat radiating fins and the second heat radiating fins are arranged.