Power conversion device

Abstract

Power conversion device, which includes: a first housing (10) having an interior, wherein the first housing (10) is formed by combining a front housing (11) and a rear housing (12); a second housing (20) spaced apart from the first housing (10), the second housing (20) having an interior; Holders (30) projecting rearward from the rear of the rear housing (12), wherein the holders (30) at least partially cover the second housing (20), and wherein the holders (30) are provided to couple the first housing (10) and the second housing (20) together; and an insulating space (S) defined between the first housing (10) and the second housing (20), wherein the insulating space (S) prevents heat transfer between the first housing (10) and the second housing (20), wherein the second housing (20) is inserted within the holders (30), and Spacers (301) are provided to keep the first housing (10) and the second housing (20) at a predetermined distance from each other.

Description

background

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

[0002] An energy storage system is a system that increases energy efficiency by storing energy generated by a power plant and delivered through a power system, or energy generated from renewable energy such as sunlight, wind power, and hydropower, in a storage system such as a battery, and then selectively and efficiently using the energy when the energy is needed.

[0003] It is possible to even out an electrical load that varies significantly according to the time of day and season using an energy storage system. Accordingly, the overall load factor can be improved. Furthermore, electricity costs can be reduced. Furthermore, it is possible to reduce the costs of building and operating additional power plants. Furthermore, it is possible to reduce electrical loads and save energy.

[0004] Such an energy storage system can be installed in conjunction with a power system, a power generation system, a power supply system and users, etc., and can be used for frequency regulation, stabilization of an output of an electric generator using renewable energy, peak load balancing, load leveling, and as an emergency power source, etc.

[0005] Energy storage systems are generally divided into physical energy storage and chemical energy storage depending on the type of energy storage. Physical energy storage may include options such as pumping water, storing compressed air, and using a flywheel, among others. Chemical energy storage may include options such as using a lithium-ion battery, a lead-acid battery, and a NaS battery, among others.

[0006] Accordingly, energy storage systems deliver power by discharging stored electricity when power is needed. Therefore, energy storage systems can deliver power flexibly.

[0007] Meanwhile, energy storage systems may include: a battery module that can hold electrical energy; and a power conversion device that can convert electrical energy supplied from the outside into electrical energy suitable for charging the battery module or converting the electrical energy stored in the battery module into electrical energy required by users.

[0008] For example, the power conversion device can convert direct current energy obtained by absorbing sunlight into alternating current energy required by users. Furthermore, the power conversion device can convert the electrical energy stored in the battery module into alternating current energy or direct current energy required by users. The storage elements may not be arranged within the housing of the power conversion device. The storage elements may be arranged within a battery module separate from the power conversion device.

[0009] That is, the power conversion device can change the characteristics of electrical energy required by users.

[0010] The power conversion device can convert power supplied from a photovoltaic power generation unit and / or a commercial power supply and can output the converted power to a battery module. This involves converting the supplied direct current or alternating current into direct current output to the battery module. The power conversion device can also convert the power supplied from the photovoltaic power generation unit (direct current) and / or the battery module (direct current) and output the converted power (alternating current or direct current) to a load and a commercial power source. During conversion, the power conversion device can change the phase of the power if necessary.

[0011] Furthermore, when the power conversion device changes the characteristics of electric power, power conversion elements emit a lot of heat, so how to dissipate heat from the power conversion device is an important problem.

[0012] For example, a “solar power conversion unit” was disclosed in Korean Patent Application Laid-Open No. KR 10 2013 0 116 742 A.

[0013] According to this technology, a choke is in contact with a heat sink, and thermal grease is placed between the choke and the heat sink to dissipate heat from a power conversion device, but there are also difficulties in dissipating the heat sufficiently.

[0014] JP 2015 195652A relates to a power converter configured to convert direct current to alternating current using a plurality of switching elements, output the alternating current to an output line, and attenuate a high-frequency component contained in the alternating current by interposing a filter circuit including at least one reactor and a capacitor into the output line. The power converter includes a casing projecting outward from the interior of a housing through an opening and housing a reactor, and a member having a hole through which the output line connected to the plurality of switches is led out, which is provided between the casing and the housing and covers an opening. The plurality of switching elements are arranged to be positioned opposite the casing inside the housing, and at least one gap between the casing and the housing is radiated with heat.

[0015] JP 2015 76949A relates to a power converter comprising: a first housing for accommodating a power conversion circuit unit including a power semiconductor device; a second housing made of a material with high thermal conductivity and for accommodating a reactor for suppressing a harmonic caused by the operation of the power semiconductor device; a heat sink provided adjacent to and outside the first housing so as to oppose a position of the power semiconductor device within the first housing and performing natural cooling of the power semiconductor device; and a wiring unit for passing a connection line between the power semiconductor device and the reactor through open holes of the first and second housings.The first housing, the second housing, and a connection unit containing the wiring unit between the first and second housings are treated to be dustproof and waterproof. The second housing is separated from the power semiconductor device inside the first housing and the heat sink outside the first housing.

[0016] DE 10 2014 217 398 A1 relates to a housing body comprising a first housing, in the interior of which a first heat generator is accommodated, wherein in a first region of the outer surface a heat dissipator is arranged, which radiates the heat generated by the first heat generator to the outside, and a second housing, in the interior of which a second heat generator is accommodated, and which is fixed on a second region of the outer surface, which differs from the first region. Summary

[0017] An object of the present invention is to provide a power conversion device that can prevent an increase in an internal temperature due to different heat sources that generate heat.

[0018] Another object of the present invention is to provide a power conversion device that prevents foreign matter such as water droplets from flowing inward through holes through which wires may be laid.

[0019] That is, an object of the present invention is to provide a reliable power conversion device, particularly having higher heat dissipation efficiency and / or sealing efficiency.

[0020] The object is achieved by the features of the independent claims. Preferred embodiments are listed in the dependent claims.

[0021] A power conversion device according to the present invention may include a first housing and a second housing.

[0022] The first housing may be configured to have an interior space. The interior space is formed by combining a front housing and a rear housing.

[0023] The second housing may be spaced apart from the first housing. It may have an interior space.

[0024] A circuit board and power conversion elements for converting power may be arranged in the interior of the first housing.

[0025] Heat dissipation fins for dissipating heat from the power conversion elements may be arranged. They are preferably arranged in the rear housing of the first housing. The heat dissipation fins may be arranged at least on one side where the second housing is provided and coupled to the first housing.

[0026] One or more chokes for converting power and / or changing the phase of the power may be arranged in the interior of the second housing.

[0027] First holes and second holes for routing wires that electrically connect the parts in the first housing and the second housing may be formed on the first housing and / or the second housing.

[0028] Furthermore, sealing means for sealing the first hole and / or the second hole with the wires arranged therein may be arranged in the first hole and the second hole.

[0029] The first housing and the second housing may be coupled together by at least one holder with a predetermined gap therebetween.

[0030] An insulating space that prevents heat transfer between the first housing and the second housing may be defined between the first housing and the second housing.

[0031] In another solution, a power conversion device is provided, comprising: a first housing forming a body and having an internal space; a first power element disposed in the internal space; a second power element electrically connected to the first power element; a second housing spaced from the first housing and having a space for holding the second power element therein; at least one holder for coupling the first housing and the second housing to each other; and an insulating space defined between the first housing and the second housing and filled with outside air.

[0032] Preferably, the holders protrude backwards from the back of the first housing.

[0033] Preferably, a first hole and / or a second hole for laying wires that electrically connect the first power element and the second power element to each other are provided on the first housing and the second housing, respectively.

[0034] Preferably, the first hole and / or the second hole are sealed with sealants, wherein the wires extend through the first hole and / or the second hole.

[0035] Preferably, the second housing may be filled with a heat dissipation substance for dissipating heat from the second power element to the outside of the second housing.

[0036] According to the present invention, the power conversion elements that generate heat at a relatively high temperature and the reactors are kept separate, so that it is possible to prevent a temperature rise of the power conversion device.

[0037] Furthermore, according to the present invention, it is possible to provide a power conversion device that can prevent water drops, etc., from flowing into the housing through the holes through which wires electrically connecting the power conversion elements and the reactors pass.

[0038] Furthermore, according to the present invention, it is possible to provide a power conversion device having improved safety by dissipating heat from the power conversion elements and heat from the reactors to the outside. Brief description of the drawings

[0039] The present invention will be more fully understood from the detailed description given hereinafter and the accompanying drawings, which are provided by way of example only and thus are not limitative of the present invention, in which: Fig. 1 is a front perspective view of a power conversion device according to an embodiment of the present invention; Fig. 2 is a rear perspective view of the power conversion device according to an embodiment of the present invention; Fig. 3 is a cross-sectional view taken along the line AA of Fig. 2 is taken. Fig. 4 is an exploded perspective view of the power conversion device according to an embodiment of the present invention; Fig. 5 is an exploded perspective view of a throttle body according to an embodiment of the present invention; and Fig. 6 is a cross-sectional view taken along a line BB of Fig. 2 is taken. Detailed description of the embodiments

[0040] Embodiments of the present invention will be described in detail below with reference to the drawings. The suffixes "-module" and "-unit" used for the components in the following descriptions are used or provided purely for convenience in describing the disclosure and do not, in and of themselves, have any differentiated meanings or functions.

[0041] If it is determined that detailed descriptions of well-known functions or arrangements in the following description obscure the concept of the present invention, such detailed description will be omitted. Furthermore, the terms to be described below are defined in light of their function in the present invention and may be changed by the intention of a user, operator, or customer. Therefore, the definitions throughout this disclosure should be interpreted based on the contents.

[0042] Those skilled in the art who understand the concept of the present invention can easily obtain other embodiments within the concept by adding, changing, and removing components. However, these embodiments should be construed as being included within the concept of the present invention.

[0043] Furthermore, the components shown in the drawings may be shown differently or may be exaggerated in detail even in the same embodiment in order to help to more easily understand the present invention within the concept of the present invention.

[0044] Fig. 1 is a front perspective view of a power conversion device according to an embodiment of the present invention, and Fig. 2 is a rear perspective view of the power conversion device according to an embodiment of the present invention.

[0045] With reference to Fig. 1 and Fig. 2, a power conversion device 1 according to an embodiment of the present invention may include a housing 10 forming the entire body. A space may be defined within the housing 10. A circuit board 13 (see Fig. 3) and performance implementation elements 131 and 132 (see Fig. 2) the power conversion device 1 can be arranged in the interior.

[0046] The housing 10 can be divisible. The housing 10 can be formed by combining a front housing 11 and a rear housing 12 (see Fig. 2). The front housing 11 may provide the front of the housing 10. The rear housing 12 may provide the rear of the housing 10. The front housing 11 and the rear housing 12 may mate. For example, the front housing 11 and the rear housing 12 may be formed in polygonal shapes with open sides facing each other.

[0047] If the front housing 11 is made larger than the rear housing 12, the front housing 11 may at least partially cover parts of the rear housing 12, thereby forming the body. Alternatively, if the rear housing 12 is made larger than the front housing 11, the rear housing 12 may at least partially cover parts of the front housing 11, thereby forming the body. The present invention is not limited to this, and in this embodiment, it is exemplified that the front housing 11 covers parts of the rear housing 12, thereby forming the body. Thus, the rear housing 12 partially extends into the larger front housing 11, thereby forming an internal space within the housing 10. In other words, the front housing 11 and the rear housing 12 partially overlap.

[0048] A display 101 showing the operating state of the power conversion device 1 may be arranged on the front of the housing 10.

[0049] More specifically, the display 101 can be arranged on the front housing 11. A hole 111 (see Fig. 4) may be formed by the front housing 11. The display 101 may be mounted on the hole 111, but may also be mounted on other parts within the housing 10. The display 101 is inserted into the hole 111 and may be fixed by fasteners. The display 101 may be operatively connected to a circuit board, etc., disposed within the housing. The display 101 may be a touch display that not only displays the operating state of the power conversion device 1 to the outside, but can also receive operating signals / commands and / or inputs from the outside. However, the present invention is not limited to this.

[0050] A throttle housing 20 having an interior space separate from the housing 10 may be arranged at a predetermined distance behind the housing 10. Thus, the throttle housing 20 is provided outside the interior space of the housing 10. The housing 10 may be referred to as the "first housing" of the power conversion device 1. The throttle housing 20 may be referred to as the "second housing" of the power conversion device 1.

[0051] In this embodiment, one or more chokes 23 (see Fig. 3) is arranged in the second housing, so that it is clear that the second housing is referred to as the throttle housing 20. The present invention is not limited to this, and not only the one or more throttles 23, but also other parts and elements can be arranged in the second housing. Furthermore, it may be possible to add a third housing and a fourth housing, etc., in addition to the second housing.

[0052] The parts that can be arranged in the housings, ie a plurality of power conversion elements for converting power, can be referred to as “first power elements” and “second power elements” depending on the name of the housings in which the elements can be arranged.

[0053] For example, the elements arranged in the first housing may be referred to as first power elements, which may include the circuit board 13 and the power conversion elements 131 and 132. Furthermore, the elements arranged in the second housing may be referred to as second power elements, which may include the one or more reactors 23. However, the present invention is not limited thereto.

[0054] The throttle body 20 and the housing 10 may be coupled by brackets 30. The brackets 30 may protrude from the throttle body 20. Alternatively, the brackets 30 may protrude from the housing 10. However, the present invention is not limited thereto.

[0055] A heat dissipation fin 121 for dissipating heat generated by the power conversion elements 131 and 132 arranged in the housing 10 to the outside is arranged on the rear side of the housing 10.

[0056] More specifically, the heat dissipation fin 121 may protrude rearward from the rear housing 12. A plurality of heat dissipation fins 212 may be provided. The heat dissipation fins 121 may be spaced apart from one another. The heat dissipation fins 121 may be integrally formed with the rear housing 12.

[0057] The heat dissipation fins 121 can absorb heat from the one or more power conversion elements 131 and 132 in the interior and dissipate the heat to the outside. That is, the heat dissipation fins 121 can be arranged at positions corresponding to the power conversion elements 131 and 132 in the interior. In this embodiment, the heat dissipation fins 121 are arranged on both sides of the throttle body 20.

[0058] Fixing elements 41 and 42 for fixing the housing 10 to a fixed structure such as a wall or a support may be provided on the rear side of the housing 10.

[0059] More specifically, the housing 10 can be fixed to a fixed structure such as a wall or a support by the fixing members 41 and 42. The fixing members 41 and 42 can include an upper fixing member 41 and a lower fixing member 42. The fixing members 41 and 42 are fixed to the rear housing 12, and the housing 10 can be fixed to a fixed structure such as a wall or a support by fixing the fixing members 41 and 42 to the fixed structure such as a wall or a support.

[0060] The upper fixing member 41 may be disposed at an upper portion of the rear housing 12. The upper fixing member 41 may be coupled to the heat dissipation fins 121. The upper fixing member 41 may be connected to the rear side of the rear housing 12 by coupling to the heat dissipation fins 121. When the upper fixing member 41 is suspended from a fixed structure such as a wall or a support, the rear housing 12 may be fixed. The present invention is not limited to this, and the upper fixing member 41 may be attached to a fixed structure such as a wall or a support by fastening means.

[0061] The lower fixing element 42 may be arranged at a lower portion of the rear housing 12. The lower fixing element 42 may be vertically aligned with the upper fixing element 41. That is, the lower fixing element 42 is spaced apart from the rear housing 12. Support sections 123 may be provided to connect the lower fixing element 42 to the rear housing 12. The support sections 123 and the lower fixing element 42 may be coupled to each other. The lower fixing element 42 may be attached to a fixed structure such as a wall or a support by fasteners.

[0062] The support portions 123 may protrude rearward from the rear housing 12. The support portions 123 may be coupled to the lower fixing member 42. In other words, when the lower fixing member 42 is coupled to the fastening portions 123 that protrude rearward from the rear housing 12, the lower fixing member 42 and the upper fixing member may be vertically aligned one after the other. According to this arrangement, the housing 10 can be held parallel without tilting when fixed to a fixed structure such as a wall or a support.

[0063] Fig. 3 is a cross-sectional view taken along a line AA of Fig. 2 is taken.

[0064] With reference to Fig. 3, the circuit board 13 and the power conversion elements 131 and 132 according to the embodiment may be arranged in the housing 10. The circuit board 13 and the power conversion elements 131 and 132 may be electrically connected to each other.

[0065] The circuit board 13 may be a printed circuit board. Multiple devices may be arranged on the circuit board 13. The power conversion elements 131 and 132 may be connected to the circuit board 13.

[0066] The power conversion elements 131 and 132 may be IGBTs (Insulated Gate Bipolar Transistors). The power conversion elements 131 and 132, which are important parts for converting power in the power conversion device 1, may dissipate high-temperature heat during the power conversion process.

[0067] Accordingly, the heat dissipation fins 121 are arranged on the rear housing 12 to dissipate the heat generated by the power conversion elements 131 and 132 to the outside. The power conversion elements 131 and 132 can be directly connected to the rear housing 12.

[0068] This means that the heat generated by the power conversion elements 131 and 132 can be dissipated to the rear case 12, which is in direct contact with the power conversion elements 131 and 132, and the heat can be dissipated to the outside through the heat dissipation fins 121 arranged on the rear case 12 at locations corresponding to the power conversion elements 131 and 132. Thus, the heat dissipation fins 121 are arranged at locations that at least partially overlap with the power conversion elements 131 and 132.

[0069] The rear housing 12, which contacts the power conversion elements 131 and 132, and the heat dissipation fins 121 can be made of materials with high thermal conductivity. For example, the rear housing 12 and the heat dissipation fins 121 can be considered a heat sink. However, the present invention is not limited to this. The one or more reactors 23 may be arranged within the reactor housing 20 according to the embodiment. The one or more reactors 23 may stabilize power received from the outside and supplied to the power conversion elements 131 and 132, or the one or more reactors 23 may stabilize power converted by the power conversion elements 131 and 132 and to be supplied to power consumers outside the power conversion device. While stabilizing power, the one or more reactors 23 also generate high-temperature heat. Accordingly, the one or more reactors 23, similar to the power conversion elements 131 and 132, may be heat sources that generate high-temperature heat in the power conversion device 1. The one or more reactors 23 may introduce reactance into a circuit.Thus, the one or more chokes 23 may be provided to stabilize the current supplied to DC loads, AC loads and / or battery modules and / or solar modules, etc.

[0070] The power conversion device 1 can, for example, convert direct current energy obtained by solar modules absorbing sunlight into alternating current energy required by users. Furthermore, the power conversion device can convert the electrical energy stored in the battery module connected to the power conversion device 1 into alternating current or direct current required by users. The storage elements (rechargeable battery cells, supercapacitors) may not be arranged within the housing of the power conversion device 1. The storage elements may be arranged within a battery module separate from the power conversion device 1.

[0071] That is, the power conversion device 1 changes the characteristics of electrical energy supplied to the power conversion device 1 into a form required by users.

[0072] The power conversion device 1 can convert power fed in from a photovoltaic power generation unit and / or a commercial power supply and can output the converted power to a battery module. This involves converting the fed-in direct current or alternating current into direct current output to the battery module. The power conversion device 1 can also convert the power fed in from the photovoltaic power generation unit (direct current) and / or the battery module (direct current) and output the converted power (alternating current or direct current) to a load and a commercial power source. During the conversion, the power conversion device can change the phase of the power if necessary.

[0073] The heat from the one or more chokes 23 within the choke housing 20 is dissipated to the choke housing 20, and then the heat dissipated to the choke housing 20 can be dissipated to the outside. Furthermore, the choke housing 20 can be filled with a substance having high thermal conductivity or high heat dissipation capability to more efficiently dissipate heat from the one or more chokes 23 to the outside. Since the choke housing 20 is at least partially surrounded by or embedded in the heat dissipation fins 121, the heat dissipation fins 121 can further assist heat dissipation.

[0074] For example, it may be possible to fill the throttle housing 20 with a substance that has a high heat dissipation capacity or high thermal conductivity in a liquid state and then allow the substance to harden. In other words, the throttle housing 20 can be filled with a substance for heat dissipation.

[0075] According to this arrangement, the heat from the one or more throttles 23 can be efficiently transferred to the throttle body 20, and the heat transferred to the throttle bodies 20 can be dissipated to the outside.

[0076] Fig. 4 is an exploded perspective view of the power conversion device according to an embodiment of the present invention, and Fig. 5 is an exploded perspective view of the throttle body according to an embodiment of the present invention.

[0077] With reference to Fig. 4 and Fig. 5, the power conversion device 1 according to an embodiment of the present invention may include the housing 10 formed by combining the front housing 11 and the rear housing 12. The power conversion device 1 may further include the throttle body 20 formed by combining a basket 21 and a basket cover 22. The housing 10 and the throttle body 20 may be coupled by the brackets 30.

[0078] The circuit board 13 can be arranged within the housing 10. The power conversion elements 131 and 132 can be mounted on the circuit board 13. The power conversion elements 131 and 132 and the circuit board 13 can be electrically connected to each other. The circuit board 13 can be fixed to the front housing 11 or the rear housing 12. In the embodiment, the circuit board 13 is exemplified as being fixed to the rear housing 12.

[0079] The one or more throttles 23 can be arranged within the throttle housing 20. The one or more throttles 23 can be fixed to the basket 21 and / or the basket cover 22. In the embodiment, it is shown by way of example that the one or more throttles 23 are fixed to the basket 21.

[0080] More specifically, the throttle housing 20 may accommodate the one or more throttles 23 therein. The throttle housing 20 may be spaced apart from the rear housing 12. The throttle housing 20 may include the basket 21 forming the body and the basket cover 22 covering the basket 21. The one or more throttles 23 may be covered with the basket cover 22 within the basket 21.

[0081] The basket cover 22 can close the open side of the basket 21. The basket cover 22 can be connected to an edge of the basket 21 like a hinged door. However, the present invention is not limited thereto. The basket and / or the basket cover can include heat dissipation fins and / or ventilation slots to further improve heat dissipation. The ventilation slots can be provided on the back and / or bottom of the second housing to prevent water droplets from entering the interior of the second housing 20.

[0082] The circuit board 13, the power conversion elements 131 and 132, and the one or more chokes 23 may be electrically connected to one another. For this purpose, the one or more chokes 23 and the circuit board 13 may be connected to one another by wires 24. The wires may be connected to them through the housing 10 and the choke housing 20.

[0083] That is, a first hole 125 and a second hole 211 may be formed on the housing 10 and the throttle body 20, respectively, so that the wires 24 can pass through them. The first hole 125 may be formed on the housing 10. The second hole 211 may be formed on the throttle body 20.

[0084] The first hole 125 and the second hole 211 may be formed to face each other. The first hole 125 and the second hole 211 may be formed in various shapes, such as a circle or a polygon, but in the embodiment, they are formed in a polygonal shape.

[0085] The brackets 30 can be arranged on the rear housing 12. The throttle body 20 can be fixed to the brackets 30.

[0086] More specifically, the brackets 30 may protrude rearward from the rear of the rear housing 12. The brackets 30 may be configured to partially cover the throttle body 20. The rear housing 12 and the throttle body 20 may be arranged by the brackets 30 with a predetermined gap therebetween.

[0087] For example, the brackets 30 may be configured to cover the corners of the polygonal throttle body 20. A spacer 301 may be formed within the brackets 30 to space the throttle body 20 and the rear housing 12 with a predetermined gap therebetween.

[0088] That is, the throttle body 20 may be inserted inside the holders 30 with the corners covered by the holders 30. When the throttle body 20 is inserted inside the holders 30, one side of the throttle body 20 may be in contact with the spacers 301. Since the throttle body 20 side is in contact with the spacers 301, the rear housing 12 and the throttle body 20 may be fixed to the holders 30 by the spacers 301 with a gap therebetween.

[0089] The holder 30 may be formed in a tubular shape that connects the housing 10 and the throttle body 20 without covering the throttle body 20. In this case, the first hole 125 and the second hole 211 of the housing 10 and the throttle body 20 may be formed in the holders. Furthermore, the holders 30 may be fixed to the housing 10 and the throttle body 20 by welding, etc.

[0090] The present invention is not limited to this. The brackets 30 partially cover the throttle body 20 in the embodiment, so that the throttle body 20 can be separated from the brackets 30.

[0091] Fig. 6 is a cross-sectional view taken along a line BB of Fig. 2 is taken.

[0092] With reference to Fig. 6, the circuit board 13 and the power conversion elements 131 and 132 in the housing 10 and the one or more chokes 23 in the choke housing 20 may be electrically connected to each other by the wires 24. The first hole 125 through which the wires 24 pass may be formed on the housing 10. Furthermore, the second hole 211 through which the wires 24 pass may be formed on the choke housing 20.

[0093] A sealant may be disposed in the first hole 125 and / or the second hole 211 to prevent water droplets, etc., from flowing inward through the first hole 125 and the second hole 211, with the wires 24 passing through the holes. The sealant may be disposed in the space between the wires 24 and the first hole 125. The sealant may be made of a water-resistant material such as rubber or silicon.

[0094] It is exemplified in the embodiment that the first hole 125 and the second hole 211 are formed substantially in the center of the throttle body 20. This serves to minimize the lengths of the wires 24 passing through the first hole 125 and the second hole 211.

[0095] Alternatively, the first hole 125 and the second hole 211 may be formed close to the brackets 30. More specifically, the first hole 125 and the second hole 211 may be formed inside the brackets 30, which are partially curved to cover the throttle body 20. When the first hole 125 and the second hole 211 are formed inside the brackets 30, the brackets 30 prevent water drops, etc., from flowing down from the top of the power conversion device into the first hole 125 and the second hole 211.

[0096] That is, the holders 30 can act as an eave that prevents water drops etc. from flowing down into the first hole 125 and the second hole 211.

[0097] When the housing 10 and the throttle body 20 are combined by the holders 30, the housing 10 and the throttle body 20 can be spaced apart from each other by a predetermined distance by the spacers 301. The space between the housing 10 and the throttle body 20 in this assembly can be referred to as an insulating space S.

[0098] The space S is defined between the housing 10 and the throttle body 20 and can be filled with air. The air between the housing 10 and the throttle body 20 can prevent heat from being transferred from the throttle body 20 to the housing 10. Furthermore, heat can be prevented from being transferred from the housing 10 to the throttle body 20.

[0099] That is, since the insulating space S is defined between the housing 10 and the throttle body 20, it is possible to prevent the temperature of the housing 10 and the throttle body 20 from rising.

Claims

[1] Power conversion device comprising: a first housing (10) having an interior space, the first housing (10) being formed by combining a front housing (11) and a rear housing (12); a second housing (20) spaced from the first housing (10), the second housing (20) having an interior space; Holders (30) projecting rearwardly from the rear of the rear housing (12), the holders (30) at least partially covering the second housing (20), and the holders (30) being provided to couple the first housing (10) and the second housing (20) to each other; and an insulating space (S) defined between the first housing (10) and the second housing (20), the insulating space (S) preventing heat transfer between the first housing (10) and the second housing (20), wherein the second housing (20) is inserted within the holder (30), and Spacers (301) are provided to keep the first housing (10) and the second housing (20) at a predetermined distance from each other. [2] The device according to claim 1, wherein a printed circuit board (13) and power conversion elements (131, 132) are arranged within the first housing (10) and one or more chokes (23) are arranged in the second housing (20). [3] The device according to claim 2, further comprising wires (24) for electrically connecting the printed circuit board (13), the power conversion elements (131, 132) and the one or more chokes (23) to each other, wherein a first hole (125) and / or a second hole (211) for passing the wires (24) is / are provided, which is / are formed on the first housing (10) and / or the second housing (20), respectively. [4] The device according to claim 3, wherein the first hole (125) and the second hole (211) are arranged to at least partially face each other. [5] Device according to claim 3, wherein the holders (30) are at least partially curved and the first hole (125) and / or the second hole (211) is / are formed within the curved portions of the holders (30). [6] The device according to claim 3 or 5, wherein one or more sealing means are provided for sealing the first hole (125) and / or the second hole (211), wherein wires extend through the first hole (125) and / or the second hole (211). [7] Device according to one of claims 2 to 6, wherein the power conversion elements (131, 132) are in contact with an inner side of the rear housing (12) which, in combination with the front housing (11), forms the first housing (10). [8] A device according to any one of the preceding claims, wherein heat dissipation fins (121) are provided for dissipating heat generated in the first housing (10) from the interior of the first housing (10) to the outside of the rear housing (12). [9] Device according to one of the preceding claims, wherein the second housing (20) comprises: a heat dissipation substance filled into the interior of the second housing to dissipate heat to the outside of the second housing; a basket (21) forming a body, the basket (21) being open on at least one side; and / or a basket lid (22) covering the open side of the basket (21), wherein the basket (21) and / or the basket lid (22) is / are preferably provided with heat dissipation fins and / or ventilation slots. [10] Power conversion device comprising: a first housing (10) forming a body and having an interior space, the housing (10) being formed by combining a front housing (11) and a rear housing (12); a first power element (131) arranged in the interior space; a second power element (23) electrically connected to the first power element (131); a second housing (20) spaced from the first housing (10) and having a space for receiving the second power element (23) therein; Holders (30) for coupling the first housing (10) and the second housing (20) to each other, the holders (30) projecting rearwardly from the rear side of the rear housing (12), the holders (30) at least partially covering the second housing (20); and an insulating space (S) defined between the first housing (10) and the second housing (20) and filled with outside air, wherein the second housing (20) is inserted within the holder (30), and Spacers (301) are provided to keep the first housing (10) and the second housing (20) at a predetermined distance from each other.

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