KR20180028840A - Power conversion device - Google Patents

Abstract

The present invention relates to a power converting device. The power converting device comprises: a first housing including an inner space by coupling a front case and a rear case; a second housing separated from the first housing and including an accommodation space formed therein; a connection part disposed between the first housing and the second housing and connecting the first housing with the second housing; and an insulating space formed between the first housing and the second housing and preventing heat generated in the first and second housings from being transferred to each other. According to the present invention, the power converting device can prevent a temperature of a power converting device from being increased by separately accommodating a power converting element and a reactor generating relatively high heat. The power converting device can prevent water drops from penetrating the housing through a through hole through which a wire electrically connecting the power converting element with the reactor passes. Further, the power converting device can provide a power converting device with increased safety of a product by discharging heat generated from the power converting element and heat generated from the reactor to the outside.

Description

POWER CONVERSION DEVICE

The present invention relates to a power conversion apparatus.

The energy storage system stores the electric power generated from a power plant and supplied to the electric power system or the electric power generated from renewable energy such as solar, wind, and water power into a storage system including a battery or the like, It is a system that improves the energy efficiency by using it selectively and efficiently.

Using energy storage systems can equalize electrical loads with large time and seasonal variations. This can improve the overall load factor. In addition, the power generation cost can be lowered. In addition, it is possible to reduce the investment cost and operating cost required for the expansion of electric power facilities. In addition, it can lower the electricity bill and save energy.

These energy storage systems are installed in connection with power systems, generators, transmission and distribution, and customers, and are equipped with frequency regulation, generator output stabilization using peak energy, peak shaving, load leveling, And emergency power supply.

Energy storage systems are divided into physical energy storage and chemical energy storage depending on the storage method. Physical energy storage includes pumped storage, compressed air storage, and flywheel. Chemical storage includes lithium ion batteries, lead acid batteries, and Nas batteries.

Thus, the energy storage system discharges the charged electric power to supply electric power when necessary. This allows the energy storage system to supply power flexibly.

The energy storage system includes a battery module that can store electric energy, and a battery module that converts electric energy supplied from the outside into electric energy suitable for charging to be charged in the battery module, And may include a power conversion device capable of converting the electric energy into a required electric energy.

The power conversion apparatus can convert electrical energy in the form of direct current (DC) power generated by absorbing light from the sun into electric energy in the form of alternating current (AC) power required by the customer. Then, the electric energy stored in the battery module can be converted into electric energy of AC (alternating current) or DC (direct current) power type demanded by the customer.

That is, the power conversion apparatus can perform a function of converting the characteristics of electric energy required by each customer.

In addition, since the power converter emits a large amount of heat from the power conversion device during the conversion of the characteristics of the electric energy, the heat dissipation of the power conversion device is an important issue.

For example, Korean Patent Laid-Open Publication No. 10-2013-0116742, " Photovoltaic power conversion device " is disclosed.

According to the conventional technology, a reactor is brought into contact with a heat sink to dissipate heat from the power conversion apparatus, and a thermal grease is interposed between the reactor and the heat sink. However, There is a limit to obtaining.

Korean Patent Laid-Open Publication No. 10-2013-0116742, "Solar Power Conversion Device"

The present invention can provide a power conversion device capable of preventing a plurality of heat sources generating heat from being spaced apart from each other to prevent an internal temperature from being improved by different heat sources.

The present invention can provide a power conversion device capable of preventing foreign matter such as water droplets from penetrating into a hole through a hole through which a wire or the like can pass.

That is, the present invention can provide a power conversion device capable of improving the thermal efficiency and waterproof efficiency.

The power conversion apparatus according to the present invention may include a first housing and a second housing.

The first housing may be formed to have an inner space by engaging the front case and the rear case.

The second housing may be spaced apart from the first housing and may have a receiving space therein.

In addition, a circuit board and a power conversion element for converting power may be disposed in the inner space of the first housing.

The rear case of the first housing may be provided with a radiating fin for discharging heat generated from the power converting element to the outside.

In addition, a reactor for converting power may be disposed in the accommodation space of the second housing.

The first housing and the second housing are respectively provided with first through holes and second through holes through which electric wires can be electrically connected to the components housed in the first housing and the second housing, respectively .

The first through hole and the second through hole may each be provided with a sealing portion sealing the first through hole and the second through hole in a state where the electric wire is disposed.

Also, the first housing and the second housing may be connected to each other by a connecting portion in a state of being separated from each other.

In addition, a heat-insulating space is provided between the first housing and the second housing to prevent heat generated in the first housing and the second housing from being transmitted to each other.

According to the present invention, the temperature of the power conversion apparatus can be prevented from increasing by separately accommodating the power conversion element and the reactor, which generate relatively high heat, from each other.

According to the present invention, it is possible to provide a power conversion device capable of preventing water droplets or the like from penetrating into the inside of a housing through a through hole through which an electric wire electrically connecting a power conversion element and a reactor can pass.

According to the present invention, it is possible to provide a power conversion device in which the heat generated in the power conversion element and the heat generated in the reactor are discharged to the outside, whereby the safety of the product is improved.

1 is a front perspective view of a power conversion apparatus according to the present embodiment.
2 is a rear perspective view of the power conversion apparatus according to the present embodiment.
3 is a cross-sectional view of the AA region of FIG.
4 is an exploded perspective view of the power conversion device according to the present embodiment.
5 is an exploded perspective view of the reactor housing according to the present embodiment.
FIG. 6 is a cross-sectional view of the BB region of FIG. 2; FIG.

Hereinafter, embodiments related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Those skilled in the art, who understands the spirit of the present invention, can easily implement other embodiments included in the scope of the same concept by adding, changing, deleting, and adding components. However, this also falls within the scope of the present invention.

It is to be understood that, although the present invention may be embodied in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein, It can be expressed.

FIG. 1 is a front perspective view of a power conversion apparatus according to the present embodiment, and FIG. 2 is a rear perspective view of a power conversion apparatus according to the present embodiment.

Referring to FIGS. 1 and 2, the power conversion apparatus 1 according to the present embodiment may include a housing 10 forming a body. An internal space may be formed in the housing 10. 3), the power conversion elements 131 and 132 (see FIG. 3), and the like constituting the power conversion apparatus 1 may be disposed in the internal space.

The housing 10 may be removably formed. The housing 10 may be provided by a combination of the front case 11 and the rear case 12 (see FIG. 2). The front case 11 may provide a front surface of the housing 10. The rear case 12 may provide a rear surface of the housing 10. The front case 11 and the rear case 12 may be fitted to each other. For example, the front case 11 and the rear case 12 may be polygonal openings facing each other.

When the front case 11 is provided to be larger than the rear case 12, the front case 11 covers the rear case 12 to form a body. When the rear case 12 is provided to be larger than the front case 11, the rear case 12 may cover the front case 11 to form a body. The present invention is not limited to this. In the present embodiment, the front case 11 covers the rear case 12 to form a body.

A display unit 101 may be provided on the front surface of the housing 10 to indicate the operation state of the power conversion apparatus 1. [

In detail, the display unit 101 may be provided in the front case 11. The front case 11 may be provided with an insertion hole 111 (see FIG. 4) for mounting the display unit 101 thereon. The display unit 101 may be inserted into the insertion hole 111 and fixed by a fastening member. The display unit 101 may be connected to a circuit board or the like accommodated in the housing 10 to operate. The display unit 101 may be provided as a touch display that not only externally displays the operation state of the power conversion apparatus 1 but also receives an operation signal from the outside. It is not limited to this idea.

The housing 10 may further include a reactor housing 20 having a housing space separate from the housing 10 and spaced apart from the housing 10 at the rear of the housing 10. At this time, the housing 10 may be referred to as a " first housing " of the power conversion apparatus 1. The reactor housing 20 may be referred to as a " second housing " of the power conversion apparatus 1.

In the present embodiment, it can be understood that the second housing is referred to as the reactor housing 20 by accommodating the reactor 23 (see FIG. 3). The present invention is not limited to this, and other components or elements other than the reactor 23 may be accommodated in the second housing. It would also be possible to add a third housing, a fourth housing, etc., as well as the second housing.

The parts accommodated in each housing, that is, the plurality of power conversion parts provided for converting the electric power, are referred to as " first electric power component ", " second electric power component " Can be called.

For example, the component housed in the first housing may be referred to as a first power component, and the first power component may include the circuit board 13, the power conversion elements 131 and 132, and the like. The parts accommodated in the second housing may be referred to as a second power component, and the reactor 23 may be included in the second power component. It is not limited to this idea.

The reactor housing 20 and the housing 10 may be connected to each other by a connecting portion 30. [ The connection portion 30 may protrude from the reactor housing 20. The connection portion 30 may protrude from the housing 10. It is not limited to this idea.

A heat dissipation fin 121 may be provided on the rear surface of the housing 10 to dissipate heat generated in the power conversion elements 131 and 132 received in the inner space of the housing 10 to the outside.

In detail, the radiating fin 121 may protrude rearward from the rear case 12. The plurality of heat dissipation fins 121 may be provided. The radiating fins 121 and the radiating fins 121 may be spaced apart from each other. The radiating fins 121 may be formed integrally with the rear case 12.

Heat may be transferred from the power conversion elements 131 and 132 accommodated in the inner space to the outside. That is, the radiating fins 121 may be disposed at positions corresponding to the power conversion elements 131 and 132 disposed in the inner space. The radiating fins 121 of the present embodiment are shown as being disposed on both sides of the reactor housing 20.

On the rear surface of the housing 10, fixing parts 41 and 42 for fixing the housing 10 such as a wall, a support stand, and the like may be provided.

In detail, the housing 10 may be fixed to the fixing structure such as a wall, a support, etc. by the fixing portions 41 and 42. The fixing portions 41 and 42 may include an upper fixing portion 41 and a lower fixing portion 42. The fixing portions 41 and 42 are fixed to the rear case 12 and the fixing portions 41 and 42 are fixed to a fixing structure such as a wall and a supporting stand so that the housing 10 can be fixed to a wall, And can be supported in a fixed structure.

The upper fixing part 41 may be disposed on the upper part of the rear case 12. [ The upper fixing part 41 may be connected to the radiating fin 121. The upper fixing part 41 may be coupled to the rear surface of the rear case 12 by being connected to the radiating fin 121. When the upper fixing part 41 is caught by a fixing structure such as a wall, a supporting stand, or the like, the rear case 12 can be fixed. The upper fixing part 41 may be fastened to the fixing structure such as a wall, a support, or the like by the fastening member.

The lower fixing part 42 may be disposed at a lower portion of the rear case 12. The lower fixing part 42 may be disposed on the same line as the upper fixing part 41. That is, the lower fixing part 42 may be spaced apart from the rear case 12. At this time, a support 123 connecting the lower fixing part 42 and the rear case 12 may be provided. The support portion 123 and the lower fixing portion 42 may be connected to each other. The lower fixing part 42 may be fixed to the fixing structure such as the wall, the supporting frame, or the like by a fastening member.

The support portion 123 may protrude rearward from the rear case 12. The support portion 123 may be connected to the lower fixing portion 42. In other words, the lower fixing part 42 is connected to the supporting part 123 protruding rearward from the rear case 12 so that the lower fixing part 42 is aligned with the upper fixing part 41 . With such a configuration, even if the housing 10 is fixed to a fixed structure such as a wall, a support stand, or the like, it can be supported in a parallel direction without being inclined.

3 is a cross-sectional view of the region A-A of FIG. 2;

Referring to FIG. 3, the circuit board 13 and the power conversion elements 131 and 132 may be disposed inside the housing 10 according to the present embodiment. The circuit board 13 and the power conversion elements 131 and 132 may be electrically connected to each other.

The circuit board 13 may be provided as a printed circuit board. A plurality of elements may be mounted on the circuit board 13. The power conversion elements 131 and 132 may be connected to the circuit board 13.

The power conversion elements 131 and 132 may be provided as IGBTs, for example. The power conversion devices 131 and 132 are core components for converting power in the power conversion device 1 and can emit high-temperature heat in the process of converting power.

Therefore, in order to dissipate the heat generated from the power conversion elements 131 and 132 to the outside, the rear case 12 may be provided with a radiating fin 121. The power conversion elements 131 and 132 may be directly connected to the rear case 12.

That is, the power conversion elements 131 and 132 directly contact the rear case 12 to discharge heat, and the discharged heat is transmitted to the radiating fins 121 provided at the positions where the power converting elements 131 and 132 are disposed And can be transmitted to the outside.

At this time, the rear case 12 and the radiating fins 121 provided with the power conversion elements 131 and 132 may be provided with a material having a high thermal conductivity. For example, the rear case 12 and the radiating fin 121 may be regarded as one heat sink. It is not limited to this idea.

A reactor 23 may be disposed inside the reactor housing 20 according to the present embodiment. The reactor 23 may stabilize the power applied from the outside or stabilize the power converted by the power conversion elements 131 and 132. The reactor 23 generates high-temperature heat to stabilize the power applied to the reactor 23. Therefore, the reactor 23 can operate as a heat source for generating heat at a high temperature, for example, the power conversion device 1, like the power conversion devices 131 and 132.

The heat generated in the reactor 23 is transferred to the reactor housing 20, and the heat transferred to the reactor housing 20 can be discharged to the outside. In order to more efficiently discharge the heat generated from the reactor 23 to the outside of the reactor housing 20, a material having an excellent thermal conductivity or an excellent heat dissipation performance is disposed inside the reactor housing 20 Can be filled.

For example, the liquid housing material 20 may be solidified by inserting a liquid material having excellent heat dissipation performance or a material having a high thermal conductivity into the reactor housing 20. In other words, a material for heat dissipation may be sealed inside the reactor housing 20.

According to this structure, the heat generated in the reactor 23 is more efficiently transferred to the reactor housing 20, and the heat transferred to the reactor housing 20 can be discharged to the outside.

FIG. 4 is an exploded perspective view of the power conversion apparatus according to the present embodiment, and FIG. 5 is an exploded perspective view of the reactor housing according to the present embodiment.

4 and 5, the power conversion apparatus 1 according to the present embodiment may include a housing 10 formed by combining a front case 11 and a rear case 12. [ The power conversion apparatus 1 may include a reactor housing 20 formed by a combination of a basket 21 and a basket cover 22. The housing 10 and the reactor housing 20 may be connected to each other by a connecting portion 30. [

The circuit board 13 may be disposed inside the housing 10. The power conversion elements 131 and 132 may be mounted on the circuit board 13. The power conversion elements 131 and 132 and the circuit board 13 may be electrically connected to each other. The circuit board 13 may be fixed to the front case 11 or the rear case 12. In the present embodiment, it is assumed that the circuit board 13 is fixed to the rear case 12.

A reactor (23) may be disposed inside the reactor housing (20). The reactor 23 may be fixed to the basket 21 or the basket cover 22. In the present embodiment, the reactor 23 is described as being fixed to the basket 21.

In detail, the reactor housing 20 can receive the reactor 23. The reactor housing 20 may be spaced apart from the rear case 12. The reactor housing 20 may include a basket 21 for forming a body and a basket cover 22 for shielding the basket 21. The reactor 23 may be covered by the basket cover 22 while being accommodated in the basket 21.

The basket cover (22) may shield one opening of the basket (21). Also, the basket cover 22 may be connected to one side of the basket 21, and may be provided in a rotating door manner. It is not limited to this idea.

The circuit board 13, the power conversion elements 131 and 132, and the reactor 23 may be electrically connected to each other. For this, the reactor 23 and the circuit board 13 may be connected to each other by a wire 24. The electric wire 24 may be connected to the housing 10 through the reactor housing 20.

That is, the housing 10 and the reactor housing 20 may have a first through hole 125 and a second through hole 211 through which the electric wire 24 can pass, respectively. The first through hole 125 may be provided in the housing 10. The second through hole 211 may be provided in the reactor housing 20.

The first through hole 125 and the second through hole 211 may be provided in directions opposite to each other. The first through hole 125 and the second through hole 211 may be formed in various shapes such as a circular shape and a polygonal shape, but they are shown to be provided in a polygonal shape in the present embodiment.

The rear case (12) may be provided with the connection portion (30). The reactor housing 20 may be fixed to the connection portion 30. [

In detail, the connection portion 30 may protrude from a rear surface of the rear case 12 toward a rear direction. The connection portion 30 may be formed so as to surround a portion of the reactor housing 20. The connection portion 30 may be disposed so that the rear case 12 and the reactor housing 20 are spaced apart from each other by a predetermined distance.

For example, the connection portion 30 may be formed to surround the corner portion of the reactor housing 20 formed in a polygonal shape. The connection part 30 may be provided with a spacing part 301 for spacing the reactor housing 20 and the rear case 12 at a predetermined interval.

That is, the reactor housing 20 may be inserted into the connection portion 30 while being surrounded by the connection portion 30. When the reactor housing 20 is inserted into the connection portion 30, one side of the reactor housing 20 may contact the separation portion 301. The rear case 12 and the reactor housing 20 are spaced apart from each other by the spacing part 301 so that the rear housing 12 and the reactor housing 20 are separated from each other. Can be fixed.

The connecting portion 30 may not be provided to surround the reactor housing 20 but may be provided in the form of a pipe connecting the housing 10 and the reactor housing 20. [ The first through hole 125 and the second through hole 211 provided in the housing 10 and the reactor housing 20 may be provided on the connection portion 30. [ The connection portion 30 may be fixedly coupled to the housing 10 and the reactor housing 20 by welding or the like.

The connecting portion 30 may be provided so as to surround the reactor housing 20 so that the reactor housing 20 can be separated from the connecting portion 30 .

6 is a cross-sectional view taken along the line B-B of FIG.

6, the circuit board 13 and the power conversion elements 131 and 132 disposed inside the housing 10 and the reactor 23 disposed inside the reactor housing 20 are connected to the electric wires (Not shown). A first through hole 125 through which the electric wire 24 can pass may be formed in the housing 10. In addition, a second through hole 211 through which the electric wire 24 can pass may be formed in the reactor housing 20.

The first through hole 125 and the second through hole 211 may be filled with water droplets or the like in the first through hole 125 and the second through hole 211 in a state where the electric wire 24 is disposed in the first through hole 125 and the second through hole 211 And a sealing portion for preventing penetration. The sealing portion may be provided in a space between the electric wire 24 and the first through hole 125. The sealing portion may be provided in a space between the electric wire 24 and the second through hole 211. The sealing portion may be provided, for example, with a material having a waterproof function such as rubber material, silicone, or the like.

In the present embodiment, the positions of the first through holes 125 and the second through holes 211 are formed at positions corresponding to substantially the center of the reactor housing 20. This is for providing the shortest length of the electric wire 24 connecting the first through hole 125 and the second through hole 211.

Alternatively, the first through-hole 125 and the second through-hole 211 may be disposed adjacent to the connection portion 30. The first through hole 125 and the second through hole 211 may be disposed inside the connection portion 30 that is partially bent to surround the reactor housing 20. When the first through hole 125 and the second through hole 211 are disposed inside the connection portion 30, water drops falling down from the upper portion of the power inverter 1, Penetration into the first through hole 125 and the second through hole 211 by the connection portion 30 can be prevented.

That is, the connection portion 30 may serve as a roof for preventing water droplets from penetrating above the first through holes 125 and the second through holes 211.

When the housing 10 and the reactor housing 20 are fixed by the connecting portion 30, the housing 10 and the reactor housing 20 may be spaced apart from each other by the spacing portion 301 have. At this time, a space formed between the housing 10 and the reactor housing 20 may be referred to as a heat insulating space S.

The heat insulating space S is disposed between the housing 10 and the reactor housing 20, and air can be disposed therebetween. Heat generated in the reactor housing 20 by the air disposed between the housing 10 and the reactor housing 20 can be prevented from being transmitted to the housing 10. In addition, the heat generated in the housing 10 can be prevented from being transmitted to the reactor housing 20.

That is, by forming the heat insulating space S between the housing 10 and the reactor housing 20, the temperature rise of the housing 10 and the reactor housing 20 can be suppressed.

1 power conversion device 10 housing (first housing)
11 Front case 12 Rear case
13 circuit board 20 reactor housing (second housing)
21 basket 22 basket
23 Reactor 24 Wires
30 connection part 41 upper fixing part
42 Lower fixing part 121 Radiating pin
125 first through hole 211 second through hole

Claims (12)

A first housing formed to have an inner space by a combination of a front case and a rear case;
A second housing disposed to be spaced apart from the first housing and having a receiving space therein;
A connecting portion disposed between the first housing and the second housing, the connecting portion connecting the first housing and the second housing; And
And a heat insulating space formed between the first housing and the second housing and preventing heat generated in the first housing and the second housing from being transmitted to each other. The method according to claim 1,
A printed circuit board and a power conversion element are disposed inside the first housing,
And a reactor is disposed inside the second housing. 3. The method of claim 2,
And an electric wire for electrically connecting the printed circuit board and the power conversion element to the reactor,
Wherein each of the first housing and the second housing is provided with a first through hole and a second through hole through which the electric wire passes. The method of claim 3,
And the first through-hole and the second through-hole are arranged to face each other. 5. The method of claim 4,
Wherein the connection portion is formed so as to be at least partially bent, and the first through hole and the second through hole are disposed inside a bent portion of the connection portion. The method of claim 3,
And a sealing portion sealing the first through hole and the second through hole with the electric wire disposed in the first through hole and the second through hole. 3. The method of claim 2,
And the power conversion element is brought into contact with the inside of the rear case. 8. The method of claim 7,
And a heat radiating fin for discharging heat generated from the power converting element to the outside is provided outside the rear case. The method according to claim 1,
Wherein the connection portion extends from the first housing and is configured to enclose at least a portion of the second housing. 10. The method of claim 9,
And the second housing is inserted into the connection portion and is mounted, and the first housing and the second housing are spaced apart from each other by a predetermined distance. 3. The method of claim 2,
The second housing includes:
A basket forming a body and having at least one side thereof opened; And
And a basket cover for shielding an opened one surface of the basket. A first housing forming a body and having an inner space;
A first power component housed in the interior space;
A second power component electrically coupled to the first power component;
A second housing spaced apart from the first housing and having a receiving space for receiving the second power component;
A connecting portion connecting the first housing and the second housing; And
And a heat insulating space located between the first housing and the second housing and formed by outside air.

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