KR20190027723A - Photovoltaic module, trunk cable, and photovoltaic module including the same - Google Patents

Abstract

The present invention relates to a photovoltaic module, a trunk cable, and a photovoltaic system including the same. According to an embodiment of the present invention, the photovoltaic module includes: a solar cell module; a junction box placed on the rear side of the solar cell module, and converting DC power from the solar cell module to output AC power; and a first cable electrically connected with the junction box to output the AC power. The junction box includes: an insulating case placed on the rear side of the solar cell module and made of an insulating material; a converter placed in the insulating case, and converting the level of the DC power from the solar cell module; and a circuit board including an inverter converting the DC power from the converter into AC power. The first cable includes first and second conductive lines to output the AC power from the circuit board to the outside, without grounding lines. Thus, the junction box is able to be compact.

Description

TECHNICAL FIELD [0001] The present invention relates to a photovoltaic module, a trunk cable, and a photovoltaic system having the photovoltaic module, a trunk cable, and a photovoltaic module,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar module, a trunk cable, and a solar light system having the same, and more particularly, to a solar module, a trunk cable, .

With the recent depletion of existing energy sources such as oil and coal, interest in alternative energy to replace them is increasing. Among them, solar cells are attracting attention as a next-generation battery that converts solar energy directly into electrical energy using semiconductor devices.

On the other hand, the photovoltaic module means that solar cells for solar power generation are connected in series or parallel, and the photovoltaic module can include a junction box for collecting the electricity produced by the solar cell.

On the other hand, since various circuit elements are arranged in the junction box, grounding and insulation become important. In this regard, Korean Patent Publication No. 10-20150089341 discloses a circuit element arrangement in a metal case. However, according to this publication, there is a disadvantage that a separate insulating member must be disposed in the metal case to insulate the circuit element.

An object of the present invention is to provide a solar module, a trunk cable, and a solar light system having the solar module, which can compactly realize the junction box size.

According to an aspect of the present invention, there is provided a solar module including: a solar cell module; a junction box disposed on a back surface of the solar cell module and configured to convert a DC power from the solar cell module to output an AC power; And a first cable electrically connected to the junction box and outputting an AC power, wherein the junction box comprises: an insulating case made of an insulating material disposed on a back surface of the solar cell module; And a circuit board on which an inverter for converting a direct current power from the converter to an alternating current power is mounted. The first cable is a circuit for outputting the alternating current power outputted from the circuit board to the outside A first conductive line and a second conductive line, and does not have a ground line.

According to another aspect of the present invention, there is provided a photovoltaic module including a solar cell module, and a bypass disposed in a rear surface of the solar cell module for bypassing the photovoltaic module, A second junction box spaced apart from the first junction box and converting the direct current power from the first junction box to output an alternating current power; and a second junction box electrically connected to the second junction box, And the second junction box includes an insulating case made of an insulating material disposed on the back surface of the solar cell module and a cable disposed in the insulating case for converting the level of the DC power from the solar cell module And a circuit board on which an inverter for converting a DC power from the converter to an AC power is mounted, And first and second conductive lines for outputting AC power to the outside, and does not have a ground line.

In order to achieve the above object, a trunk cable according to an exemplary embodiment of the present invention includes a cable through which an AC power input from an adjacent first solar module is connected, a connector connected to a single output cable through which an AC power from a junction box flows, And a second connector for outputting an AC power to an adjacent second solar module, wherein an interface portion into which AC power is input from one end of the cable, a third connector connected to the other end of the cable, And the cable has first and second conductive lines, and does not have a ground line.

According to another aspect of the present invention, there is provided a solar light system including a plurality of solar cell modules, a plurality of junction boxes for converting AC power from each solar cell module to output AC power, A plurality of single output cables each having first and second conductive lines electrically connected to respective junction boxes for outputting AC power and having no ground line and a single output cable of each solar cell module, And a plurality of trunk cables for externally outputting AC power of the plurality of junction boxes.

A solar cell module according to an embodiment of the present invention includes a solar cell module, a junction box disposed on the back surface of the solar cell module, for converting AC power from the solar cell module and outputting AC power, And a first cable connected and outputting an AC power, wherein the junction box comprises: an insulating case made of an insulating material disposed on a back surface of the solar cell module; an insulating case disposed in the insulating case, And a circuit board on which an inverter for converting the direct current power from the converter to the alternating current power is mounted. The first cable includes first and second cables for outputting the alternating current power outputted from the circuit board to the outside, 2 conductive lines, and does not have a ground line. In this case, since no separate insulating member is disposed in the insulating case, the size of the junction box can be compactly realized. In particular, the thickness of the junction box can be reduced.

On the other hand, by including the first cable and the second cable for connecting the first cable from the adjacent solar module, parallel connection with the adjacent solar module becomes possible.

On the other hand, the cable is electrically connected to the junction box through one through-hole formed in the junction box, and is configured without a separate ground line, so that the cable size can be compactly realized. In addition, the manufacturing cost can be reduced.

Particularly, the converter and the inverter in the circuit board are electrically connected to the floating ground, and there is no need to form a separate ground.

On the other hand, the plug further includes a plug for supplying the AC power from the cable to the external outlet, and the plug has the first and second projections corresponding to the first and second conductive lines, .

An interface unit for receiving an AC power from an adjacent solar module and an AC power from a cable and outputting an AC power to the outside, and a third cable for outputting an AC power from the interface to the outside And the third cable has the third and fourth conductive lines and does not have a ground line, thereby realizing a compact size of the third cable.

On the other hand, the circuit board includes a plurality of conductive layers spaced from each other, and the converter and the inverter are connected to the first conductive layer of the plurality of conductive layers, and the converter and the inverter include a second conductive And electrically connected to the floating ground formed on the layer, it is possible to reduce electromagnetic interference (EMI) generated in the circuit board.

In particular, by making the conductive area of the second conductive layer, in which the floating ground is formed, among the plurality of conductive layers larger than the conductive area of the other conductive layer, electromagnetic interference (EMI) do.

On the other hand, the circuit board further includes a first filter portion for noise reduction at the output end of the inverter, thereby reducing electromagnetic interference (EMI) generated in the circuit board.

On the other hand, the circuit board can be brought into contact with at least one of the first insulating case and the second insulating case, thereby reducing the thickness of the junction box.

In particular, the second conductive layer in the circuit board can be brought into contact with the second insulating case, thereby reducing the thickness of the junction box.

According to another aspect of the present invention, there is provided a photovoltaic module including: a solar cell module; a first diode disposed on a back surface of the solar cell module and having a bypass diode for bypassing a DC power source from the solar cell module; A second junction box which is spaced apart from the first junction box and converts a direct current power from the first junction box to output an alternating current power, a cable which is electrically connected to the second junction box, The second junction box includes an insulating case made of an insulating material disposed on the back surface of the solar cell module, a converter disposed in the insulating case and converting the level of the DC power from the solar cell module, And a circuit board on which an inverter for converting DC power into AC power is mounted. The cable outputs AC power output from the circuit board to the outside For, first provided with a first and second conductive lines, and does not include a ground line. In this case, since no separate insulating member is disposed in the insulating case, the size of the junction box can be compactly realized. In particular, the thickness of the junction box can be reduced.

A trunk cable according to an embodiment of the present invention includes a first connector connected to a connector of a single output cable through which an AC power from an adjoining first solar module flows, And a second connector for outputting an AC power to an adjacent second solar module, wherein the cable includes an interface unit to which an AC power from one end of the cable is input, and a third connector connected to the other end of the cable, , First and second conductive lines, and does not have a ground line. In this case, since the ground line is not provided in the cable, the size of the cable can be compactly realized. In particular, the thickness of the cable can be reduced.

According to another aspect of the present invention, there is provided a solar light system including a plurality of solar cell modules, a plurality of junction boxes for converting AC power from each solar cell module to output AC power, A plurality of single output cables each having first and second conductive lines electrically connected to respective junction boxes for outputting AC power and having no ground line and a single output cable of each solar cell module, And a plurality of trunk cables for externally outputting AC power of the plurality of junction boxes. In this case, since no separate insulating member is disposed in the insulating case, the size of the junction box can be compactly realized. In particular, the thickness of the junction box can be reduced.

1 is a front view of a solar module according to an embodiment of the present invention.
Fig. 2 is a rear view of the solar module of Fig. 1;
3 is an example of a configuration diagram of a solar photovoltaic system according to an embodiment of the present invention.
Fig. 4 is a rear view of the second solar module of Fig. 3; Fig.
FIG. 5 is an exploded perspective view of the junction box of FIG. 2; FIG.
6 to 6C are various examples of cross-sectional views of the junction box of Fig.
7 is a view showing an internal exploded view of a conventional junction box.
8 is an example of a block diagram inside the junction box of Fig.
9 is an example of a block diagram inside the junction box of Fig.
10A is an example of an internal circuit diagram of the junction box of FIG.
10B is another example of the internal circuit diagram of the junction box of FIG.
Fig. 11 is an exploded view of the circuit board of Fig. 2. Fig.
12 is a rear view of a solar module according to another embodiment of the present invention.
13 is a rear view of a solar module according to another embodiment of the present invention.
14 is an exploded perspective view of the solar cell module of FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings.

The suffix "module" and " part "for components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Accordingly, the terms "module" and "part" may be used interchangeably.

FIG. 1 is a front view of a solar module according to an embodiment of the present invention, and FIG. 2 is a rear view of the solar module of FIG. 1.

A solar cell module 100 according to an embodiment of the present invention includes a solar cell module 100 and a junction box 200 located on the back surface of the solar cell module 100. [

First, the solar cell module 100 may include a plurality of solar cells 130.

The solar cell 130 is a semiconductor device that converts solar energy into electrical energy and is a silicon solar cell, a compound semiconductor solar cell, and a stacked solar cell tandem solar cell, a dye-sensitized solar cell, or a CdTe or CIGS solar cell.

Each solar cell 130 may be electrically connected in series, parallel, or series-parallel.

In the drawing, ten solar cells 130 are connected to one string, and a total of six strings are connected in series to each other, but various modifications are possible.

The photovoltaic module 50 according to the embodiment of the present invention includes a solar cell module 100 and a solar cell module 100 disposed on the back surface of the solar cell module 100 and adapted to convert the direct current power from the solar cell module 100 And a cable 320 electrically connected to the junction box 200 and outputting an alternating current power source.

The junction box 200 includes an insulating case 491 and 492 made of an insulating material disposed on the back surface of the solar cell module 100 and a pair of insulating cases 491 and 492 disposed in the insulating cases 491 and 492, And a circuit board 37 on which an inverter 540 for converting DC power from the converter 530 to AC power is mounted. In this case, since no separate insulating member is disposed in the insulating case 491 and 492, the size of the junction box 200 can be compactly realized. In particular, the thickness of the junction box 200 can be reduced.

On the other hand, the insulating case 491, 492 may be made by molding with at least one resin of polycarbonate (PC), polyethylene (PE), polyethylene ether (PPE) or polystyrene.

The cable 320 includes first and second conductive lines 320b and 320c for outputting AC power output from the circuit board 37 to the outside and does not include a ground line do.

The cable 320 is electrically connected to the junction box 200 through one through hole formed in the junction box 200 and is constructed without a separate ground line so that the cable 320 can be made compact in size . In addition, the manufacturing cost can be reduced.

Particularly, the converter 530 and the inverter 540 in the circuit board 37 are electrically connected to the floating ground FGND, and there is no need to form a separate ground.

Meanwhile, the solar module 50 may include a connector connected to an end of the cable 320 for connecting the AC power source to an adjacent solar module or the outside. The connector at this time may be electrically connected to an inlet, an outlet, a grid, a smart meter, or a gateway.

For example, the photovoltaic module 50 may include an AC power source from the cable 320 to a neighboring photovoltaic module or a plug for outputting the photovoltaic module to the outside.

The plug 300 has the first and second protrusions 310b and 310c corresponding to the first and second conductive lines 320b and 320c so that the size of the plug 300 Can be implemented compactly.

Meanwhile, the first and second conductive lines 320b and 320c may be an L line neutral line for electrical signal transmission.

The first power terminal 310b and the second power terminal 310c may be a hot terminal or a neutral terminal of the North American standard.

The plug 300 having the first power terminal 310b and the second power terminal 310c can be connected to each of the terminals 350b and 350c of the outlet 350 disposed inside and outside the building By this connection, the AC power from the solar module 50 can be easily supplied to the system through the outlets 350 in the building.

According to this method of the present invention, there is no need for a separate device for connecting the solar module and the outlet, so that convenience for the user can be improved. Particularly, the purchaser of the solar module can easily connect the solar module to the outlet 350 by installing the solar module in the building and using the plug 300 without the need of a separate service provider.

2, the junction box 200 may include a bypass diode unit 510, a converter 530, a capacitor C1, an inverter 540, and a control unit 550. In addition, This will be described later with reference to FIG.

According to the embodiment of the present invention, the junction box 200 includes the insulating cases 491 and 492, and the circuit board 37 may be disposed in the insulating cases 491 and 492. Thereby, the junction box 200 does not need to be attached to the frame 105 for the grounding of the junction box 200 and the frame 105 and the predetermined It is possible to dispose them apart from the distance Dr.

3 is an example of a configuration diagram of a solar photovoltaic system according to an embodiment of the present invention.

The solar cell system 10 according to the embodiment of the present invention includes a plurality of solar cell modules 100a, 1000b, ..., 100n, a plurality of solar cell modules 100a, 1000b, 200n, 200n, 200b, ..., 200n, which convert DC power from a plurality of switching elements (200a, 200b, ..., 100n) 330b, ..., 330n of the solar cell modules 100a, 1000b, ..., 100n are connected to a plurality of junction boxes A plurality of trunk cables 88a, 88b, ..., 88n for outputting alternating current power of the solar cells 200a, 200b, ..., 200n to the outside, a cable 320 connected to the nth solar module 50n, .

The cables 330a, 330b, ..., and 330n are connected to the first and second output terminals for outputting AC power output from the circuit board 37 in the junction boxes 200a, 200b, ..., A second conductive line, and is not provided with a ground line. Accordingly, each of the cables 330a, 330b, ..., 330n may be referred to as a single output cable.

The plurality of trunk cables 88a, 88b, ..., 88n include cables 90a, 90b, ..., 908n through which AC power is input from adjacent solar modules, cables 90a, 90b, ..., A plurality of interface units 342a, 342b, ..., and 342n to which AC power from one end of the cables 90a to 908n are input and a plurality of And may include third connectors 89a, 89b, ..., 89n.

On the other hand, the plurality of interface units 342a, 342b, ..., and 342n are connected to the single output cables 330a, 330b, ..., 330n through which the AC power from the junction boxes 200a, 200b, 902n, 902a, 902b, ..., 902n connected to the connectors 38a, 38b, ..., 38n of the first and second solar modules, and second connectors 904a, 9040b , ..., 904n.

On the other hand, the cables 90a, 90b, ..., and 908n in the trunk cables 88a, 88b, ..., 88n are provided with third and second conductive lines, respectively, .

On the other hand, the AC power from the connectors 89a, 89b, ..., 89n and the AC power from the junction boxes 200a, 200b, ..., 200n through the interface units 342a, 342b, Can be merged and output to the outside.

On the other hand, at the ends of the plurality of cables 330a, 330b, ..., 330n outputting the AC power output from the junction boxes 200a, 200b, ..., 200n, the interfaces 342a, 342b, ..., , 38n may be connected for connection with the connectors 38a, 34b, 34n.

That is, the connectors 38a, 30b, ..., 38n may be connected for connection between the plurality of cables 330a, 330b, ..., 330n and the interfaces 342a, 342b, ..., 342n .

Meanwhile, the cable 320 connected to the nth photovoltaic module 50n may be electrically connected to an inlet, an outlet, a grid, a smart meter, or a gateway. The cable 320 at this time has first and second conductive lines 320b and 320c and is not provided with a ground line.

Fig. 4 is a rear view of the second solar module of Fig. 3; Fig.

A cable 330b for outputting AC power output from the junction box 200b and the junction box 200b and a connector 330b for connecting to the cable 330b are provided on the rear surface of the second solar module 100b, 38b, and a trunk cable 88b.

On the other hand, the junction box 200b includes an insulating case, and a circuit board may be disposed in the insulating case. Thereby, the junction box 200b does not need to be attached to the frame 105 for the grounding of the junction box 200b. As shown in the figure, on the back surface of the solar cell module 100, It is possible to dispose them apart from the distance Dr.

The connector 89b receives AC power from an adjacent solar module. For example, the connector 89b may be coupled to the second connector 904b of the interface portion 342a of the adjacent solar module 50a.

On the other hand, a trunk cable 88b may be provided to electrically connect the connector 89b and the interface unit 342b.

On the other hand, the trunk cable 88b includes a cable 90b, a first connector 902b having a structure that is located at one end (right side in the drawing) of the cable 90b and connected to the connector 38b, And a third connector 904b having a structure that is located at the other end (left side in the figure) of the cable 90b and connected to the second connector 904b 89b.

The first connector 902b is a portion to which the connector 38b is connected and can connect the trunk cable 88b and the AC output cable 87b by connecting the connector 38b and the first connector 902b have.

One of the connector 38b and the first connector 902b may have a male connector structure and the other may have a male connector structure in which a male connector structure is inserted.

For example, by fitting the connector 38b with the male connector structure and the first connector 902b with the female connector structure and the more easily movable connector 38b into the first connector 902b, 38b and the first connector 902b. However, the present invention is not limited thereto.

The second connector 904b is a portion to which the third connector 89b of the neighboring solar module 50 is connected. The neighboring solar modules 50 can be connected to each other or connected to a power network or a power system by connecting the second connector 904b and the third connector 89b of the neighboring solar module 50. [

One of the second connector 904b and the third connector 89b may have a male connector structure and the other may have a male connector structure into which a male connector structure is inserted. The second connector 904b has a male connector structure and the third connector 89b has a female connector structure so that the second connector 904b can be moved more easily to the third connector (not shown) of the interface portion 342b 89b, the second connector 904b and the third connector 89b can be connected more easily. However, the present invention is not limited thereto.

On the other hand, the cable 90b in the trunk cable 88b may include two conductive lines 90bb and 90bc without a ground line.

On the other hand, the cable 330b has two conductive lines 330bb and 330bc for externally outputting AC power output from the circuit board 37 in the junction box 200b, .

According to this, since the cable 330b is configured without a separate ground line, the size of the cable 330b can be compactly realized. In addition, the manufacturing cost can be reduced.

The cable 330b is electrically connected to the junction box 200b through one through hole formed in the junction box 200 and is constructed without a separate ground line so that the cable 330b can be compactly implemented . In addition, the manufacturing cost can be reduced.

FIG. 5 is an exploded perspective view of the junction box of FIG. 2; FIG.

The junction box 200 according to the present embodiment includes a bypass diode 510 electrically connected to a terminal 31 and / or a terminal 31 connected to the solar cell 130, And may include an inverter 540 electrically connected to the bypass diode unit 510.

At this time, the terminal 31 may be connected to the ribbon 122 drawn out from the solar cell 130.

The terminal 31, the bypass diode 510, the converter 530, the inverter 540 and the like in the junction box 200 according to the present embodiment can be mounted on the circuit board 37 together. Thereby, the terminal 31, the bypass diode unit 510, and the like. The converter 530, and the inverter 540 are integrated by the circuit board 37.

In this embodiment, the junction box 200 may include a first insulating case 491, a second insulating case 492, and a circuit board 37 which are joined together to form an integral case.

More specifically, the junction box 200 includes a first insulating case 491 disposed on the back surface of the solar cell module 100, a second insulating case 492 disposed on the first insulating case 491, A circuit board 37 on which a converter 530 for converting the level of the DC power source and an inverter 540 for converting DC power from the converter 530 to AC power are mounted, And a second insulation case 492 disposed on the circuit board 37.

Thus, the terminal 31, the bypass diode 510, the converter 530, and the inverter 540, which are located inside the first insulation case 491 and the second insulation case 492, The bypass diode unit 510, the converter 530, the inverter 530, and the inverter 530. The first and second insulation cases 491 and 492 are connected to each other through the terminal 31, the bypass diode 510, (540) can be stably received.

The junction box 200 may include a structure for connection with the solar cell 130, the outside (for example, another solar cell module 100 or a power grid), and the like.

That is, the junction box 200 includes a first through hole 49a through which the ribbon 122 for connection with the solar cell 130 passes, and a second through hole 49b through which the alternating voltage generated by the junction box 200 is transmitted And a second through hole 49b through which the output cable 320 passes.

That is, the first through hole 49a for connection with the solar cell 130 and the second through hole 49b for the AC output cable 320 may be formed in the same junction box 200. [

For example, the first through hole 49a may be formed on a surface adjacent to the solar cell module 100 (i.e., the bottom surface 4942 of the first insulating case 491).

Then, the ribbon 122 drawn out from the solar cell 130 through the holes (not shown) formed in the second sealing layer 14b and the rear substrate 18 is guided to the terminal 31 in a shorter path You can connect.

The first through holes 49a may be a single hole through which a plurality of (n) ribbons 122 corresponding to solar cell strings or the like are passed together, or a plurality of Holes may be included.

In the drawing, the first insulating case 491 includes a first through-hole 49a through which a plurality of ribbons 122 are passed together, thereby facilitating the processing of the first insulating case 491. FIG.

The second through hole 49b may be formed at a position where external circuit connection can be easily performed.

The second through hole 49b is located on the side surface 4944 far from the terminal 31 in this embodiment and the voltage provided from the solar cell module 100 to the terminal 31 is supplied to the bypass diode portion 510 And the junction box 200, and then is led out to the outside through the AC output cable 320.

Thus, the arrangement of the terminal 31, the bypass diode 510, the converter 530, and the inverter 540 can be efficiently performed.

On the other hand, in the present embodiment, it is exemplified that the output cable output from the circuit board 37 is the AC output cable 320.

Accordingly, one AC output cable 320 can be drawn out through the second through hole 49b.

On the other hand, the AC output cable 320 may include only the first and second conductive lines 320b and 320c without a ground line, as described with reference to FIG.

 That is, the AC output cable 320 in which the two conductive lines are combined can pass through one second through hole 49b, thereby simplifying the structure.

The junction box 200 is implemented as the insulation case 491 and 492 so that the junction box 200 needs to be attached to the frame 105 for the grounding of the junction box 200. [ And can be disposed on the back surface of the solar cell module 100, spaced apart from the frame 105 by a predetermined distance Dr as shown in the drawing.

On the other hand, the junction box 200 and the solar cell module 100 may be joined together by a joining member (not shown), but not limited thereto, and may be joined to each other by a joining member (not shown).

On the other hand, an adhesive member (not shown) is placed on the bottom surface (for example, the bottom surface 4942 of the first insulating case 491) of the junction box 200 adjacent to the solar cell module 100, The module 100 and the junction box 200 (or the junction box 200) are stably fixed to have excellent airtightness characteristics, sealing properties, and waterproof properties.

More specifically, the adhesive member (not shown) may be formed to have a closed space therein while enclosing the first through-hole 49a of the junction box 200 in plan view.

The ribbon 122 is positioned inside the junction box 200 by the first through hole 49a formed in the junction box 200 and the solar cell module (not shown) located inside the adhesive member 100 and the junction box 200 and the outer space. Thus, the junction box 200 having the first through-hole 49a can be sealed.

As described above, the junction box 200 includes the first through hole 49a and the second through hole 49b. Since the AC output cable 320 is disposed in the second through hole 49b, The first through hole 49a must be opened so that the ribbon 122 can smoothly pass through the first through hole 49a.

Accordingly, external materials, moisture, impurities, and the like may be introduced into the junction box 200 by the first through-hole 49a unless a separate adhesive member (not shown) is formed.

Accordingly, in this embodiment, an adhesive member (not shown) surrounding the space opened by the first through-hole 49a is formed and the inside of the junction box 200 communicates with the outside through the first through-hole 49a Can be prevented.

Accordingly, the airtightness, sealing, and waterproof characteristics of the junction box 200 can be improved. In addition, the junction box 200 can be fixed to the solar cell module 100 by an adhesive member (not shown) to improve the stability of fixation.

As the adhesive member (not shown), various materials having excellent adhesive properties, sealing properties and the like can be used. For example, a sealant or the like can be used as an adhesive member (not shown). Various variations are possible.

The junction box 200 described above may include various insulating materials capable of maintaining an outer shape or an outer surface and capable of protecting various parts, articles, members, and the like located therein. For example, if the insulating case 491 and 492 of the junction box 200 are formed of resin, the insulating property can be improved and the cost can be reduced.

6, the junction box 200 includes a first insulating case 491 and a second insulating case 492 which are joined together to form an integral case.

In this state, when the first insulating case 491 and the second insulating case 492 are separated from each other, the terminal 31, the bypass diode 510, the converter 530, and the inverter 540 are inserted The bypass diode unit 510, the converter 530, and the inverter (not shown), which are located inside the first insulation case 491 and the second insulation case 492, 540 can be stably accommodated.

The first insulating case 491 includes an inner space 494 having a bottom surface 4942 and a side surface 4944 and an inner space 4942 and a bottom surface 4942 extending from the top of the inner space 494, And a flange 496 extending parallel or inclined with respect to the flange 496.

At this time, the side surface 4944 is formed on all the edges of the bottom surface 4942 so that the inner space portion 494 can be formed to open only one side of the inner space.

For example, when the bottom surface 4942 is a rectangle, the bottom surface 4942 may have four sides 4944 extending from four edges constituting the quadrangle so that only one surface is formed in the rectangular parallelepiped. For example, the inner space portion 494 may have at least five surfaces and only one side thereof may have an open structure.

In the drawing, the bottom surface 4942 may have a shape having four straight lines and a rounded corner at a portion where two adjacent straight lines meet.

For example, the bottom surface 4942 may have a roughly rectangular shape, and a portion corresponding to four corners of the rectangular shape may have a rounded shape. The side surface 4944 may extend entirely from the edge of the bottom surface 4942 and extend (for example, perpendicularly) to intersect the bottom surface 4942.

Thus, the side surface 4944 can be formed to include four rounded surfaces each located between four planes corresponding to four straight lines and two planes adjacent to each other. Accordingly, the internal space can be sufficiently secured, and the user can be prevented from being injured by sharp edges. However, the present invention is not limited thereto, and the shape of the bottom surface 4942 and the side surface 4944 may be variously modified.

The joint flange 496 may be formed in a shape that bends and extends from the side surface 4944. The joining flange 496 provides a region where the joining member 493 is to be applied so that the first insulating case 491 and the second insulating case 492 can be joined to each other by the joining member 493. [

At this time, the joint flange 496 is bent from the side surface 4944 and extends outward to open all of the internal space of the internal space portion 494, and the terminal 31, the bypass diode portion 510, the converter 530 , The inverter 540 is easily mounted and released without being caught by the joint flange 496.

The joint flange 496 may be comprised of a flat surface parallel to the bottom surface 4942 and / or a flat surface perpendicular to the side surface 4944. Then, the joining member 493 can be stably applied on the joining flange 496. [ However, the present invention is not limited thereto.

In this embodiment, the joint flange 496 is formed continuously so as to extend entirely from the end of the side surface 4944 and to close the inside of the internal space portion 494 when seen in plan view.

Here, the joint flange 496 may be formed to be a flat surface so as to be positioned on the same plane. The first insulation case 491 and the second insulation case 492 are entirely joined by the joint member 493 applied to the joint flange 496 so that the airtightness of the interior of the junction box 200 can be kept high .

At this time, the width of the joint flange 496 is made uniform as a whole to uniformly apply the joint member 493, thereby stably bonding the first insulation case 491 and the second insulation case 492. When a cutting mechanism (for example, a knife or the like) is inserted between the joint flange 496 and the second insulation case 492 and the joint flange 496 moves along the joint flange 496 when repair, replacement or the like is required, The first insulating case 491 and the second insulating case 492 can be easily separated by cutting the insulating case 493. That is, since the cutting mechanism is moved along the flat surface of the joint flange 496, the first insulating case 491 and the second insulating case 492 can be easily separated from each other.

The second insulating case 492 may have a plate shape having an edge shape that matches an outer edge of the joint flange 496 and covers an open one side of the inner space portion 494. [

The second insulating case 492 includes an inner portion 497 which is formed to be flat so as to be parallel with the bottom surface 4942 and a second insulating case 492 which is away from the first insulating case 491 while facing outward from the inner portion 497. [ (Not shown). A portion of the outer portion 499 overlapping with the joining flange 496 is joined by the joining flange 496 and the joining member 493.

When forming the outer portion 499 inclined toward the outside as described above, a boundary line (or a boundary portion) that can be visually recognized or perceived by the equipment can be provided between the inner portion 497 and the outer portion 499 . The approximate position of the first insulating case 491 and the second insulating case 492 can be matched by positioning the inner portion 497 to be above the joint flange 496 or not to leave the joint flange 496 have.

At this time, the inner portion 497 may have an area smaller than the bottom surface 4942. For example, the width W2 of the outer portion 499 may be greater than the width W1 of the joint flange 496. [ The boundary between the inner portion 497 and the outer portion 499 is then positioned within the joint flange 496 (i.e., on the inner space) to define a first insulating case 491 and a second insulating case 492, It is possible to more easily adjust the approximate position of Thus, the boundary between the inner portion 497 and the outer portion 499 can be used as a kind of guide, alignment mark, and the like.

When the outer portion 499 is tilted away from the inner portion 497 toward the outside, the distance between the joining flange 496 and the outer portion 499, i.e., the distance between them The thickness of the joining member 493 located at the outer edge of the joining member 493 becomes larger at the outer edge than at the inner edge. Since the distance between the first insulating case 491 and the second insulating case 492 at the outer edge portion of the joint flange 496 is large, the first insulating case 491 and the second insulating case 492 The cutting mechanism can more easily be cut between the joint flange 496 and the outer portion 499 when cutting the flange 492. [

The bonding member 493 positioned between the bonding flange 496 of the first insulating case 491 and the outer portion 499 of the second insulating case 492 overlapping the first insulating case 491 and the second insulating case 492, The insulating case 492 is bonded and sealed to prevent impurities, contaminants, and the like from entering from the outside, and to improve sealing characteristics and waterproof characteristics. Various materials having bonding and / or sealing properties can be used for the joining member 493. For example, a sealant or the like may be used. However, the present invention is not limited thereto.

However, the present invention is not limited to this, and it is also possible that the junction box 200 is formed without covering the inner space as a whole. In addition, it is possible to make various modifications such that the side surface is not formed or only a part of the first insulating case 491 is formed, and the side surface is formed at least a part of the second insulating case 492. In addition, it is also possible for the junction box 200 to include three or more parts to be coupled to each other, and various other modifications are possible.

If the first insulating case 491 and the second insulating case 492 are provided together, the components and the like located therein can be easily inserted and removed. By joining them by the joining member 493, It is possible to prevent problems caused by external moisture or the like from being sealed, and to stably protect parts located inside from external impacts. However, the present invention is not limited thereto, and it is also possible that the junction box 200 includes at least one of the first insulating case 491 and the second insulating case 492. For example, when the solar cell module 100 is connected to the solar cell module 100 by the second insulating case 492 by not contacting the second insulating case 492 and bringing the joint flange 496 of the first insulating case 491 into close contact with the solar cell module 100, A case 492, and the like.

On the other hand, the circuit board 37 may be in contact with at least one of the first insulating case 491 and the second insulating case 492. [

6 shows an example of a sectional view of the junction box 200. Referring to FIG. 6, a circuit board 37 is disposed between a first insulating case 491 and a second insulating case 492 which are bonded to each other .

The first insulating case 491 accommodates the circuit board 37 and the second insulating case 492 can cover the circuit board 37. [

Particularly, the circuit board 37 can be disposed in contact with the first insulating case 491 on the first insulating case 491 disposed on the solar cell module 100. [

On the other hand, since the first insulating case 491 and the second insulating case 492 can be realized by a non-metallic plastics special resin or the like, they are insulated from the circuit board 37 itself. The circuit board 37 can be disposed on the first insulating case 491 in contact with the first insulating case 491 as shown in the figure.

In this case, since a separate space is not provided between the first insulating case 491 and the circuit board 37, the thickness h1 of the junction box can be reduced. Accordingly, there is an advantage that the size of the junction box 200 can be compactly implemented.

Since the first insulating case 491 and the second insulating case 492 can be realized by a non-metallic plastis resin or the like, the circuit board 37 and the first insulating case 491 or the second insulating case 492 492. In this case, Accordingly, the thickness h1 of the junction box can be lowered, and consequently, the size of the junction box 200 can be compactly realized.

6B is another example of the sectional view of the junction box 200. Referring to FIG. 6B, an insulation member ISI for insulation is provided between the first insulation case 491 and the circuit board 37, There is a difference in that there are further arranged.

In the figure, it is illustrated that the insulating member ISI is in contact with the upper surface FF of the circuit board 37 and the back surface BF of the back surface BF.

On the other hand, by further arranging the insulating member on the first insulating case 491 and the circuit board 37, the circuit elements in the circuit board 37 can be further protected.

On the other hand, as shown in FIG. 6B, the size of the insulating member ISI is preferably larger than the size of the circuit board 37. In order to insulate the entire circuit board 37, it is preferable that the size of the insulating member ISI is larger than the size of the circuit board 37. [

6C, another example of the cross-sectional view of the junction box 200 is shown in FIG. 6C. In FIG. 6C, the coating layer POT is formed on the back surface BF of the circuit board 37, There is a difference.

The coating layer is for insulating the back surface of the circuit board 37, and may be formed of an insulating layer or a potting material.

As described above, the circuit element in the circuit board 37 can be further protected by the coating layer POT formed on the back surface BF of the circuit board 37. [

7 is a view showing an internal exploded view of a conventional junction box.

Referring to the drawings, a conventional junction box 200x includes a first metal case 491x, a second metal case 492x, a circuit board 37x, and a first metal case 491x which are joined together to form an integral case. 491x and the circuit board 37x and a second insulating member 594x between the second metal case 492x and the circuit board 37x.

The conventional junction box 200x has an outer appearance formed by the first metal case 491x and the second metal case 492x for the grounding of the junction box and the like.

However, when the first metal case 491x and the second metal case 492x are used, the electromagnetic noise between the circuit board 37x and the first metal case 491x or the second metal case 492x is a problem .

7, the first insulating member 592x between the first metal case 491x and the circuit board 37x, the second insulating member 592x between the second metal case 492x and the circuit board 37x, (594x).

According to this structure, the first insulating member 592x and the second insulating member 594x are required, and the circuit board 37x and the first metal case 491x or the second metal case 492x are sufficiently It is disadvantageous in that the thickness of the junction box 200x becomes thick.

Further, as the thickness of the junction box 200x increases, the thickness of the frame disposed on the back surface of the junction box 200x must be increased so that the junction box 200x does not protrude from the back surface of the solar module have.

Accordingly, in the present invention, the case of the junction box is made of an insulating case made of a plastic material rather than a metal.

2, the junction box 200 according to the embodiment of the present invention includes a first insulating case 491, a second insulating case 492, and a circuit board (37).

More specifically, the junction box 200 includes a first insulating case 491 disposed on the back surface of the solar cell module 100, a second insulating case 492 disposed on the first insulating case 491, A circuit board 37 on which a converter 530 for converting the level of the DC power source and an inverter 540 for converting DC power from the converter 530 to AC power are mounted, And a second insulation case 492 disposed on the circuit board 37.

Particularly, no insulating member is disposed between the first insulating case 491 and the circuit board 37, or between the second insulating case 492 and the circuit board 37.

In this case, since the insulating members 592x and 594x as shown in FIG. 7 are removed, the size of the junction box 200 can be compactly realized. In particular, the thickness of the junction box 200 can be reduced.

8 is an example of a block diagram inside the junction box of Fig.

The conventional junction box 200x may include an internal power conversion module 700x and may include a bypass diode 510x, a converter 530x, a capacitor C1x, an inverter 540x, , And a control unit 550x.

According to the drawing, AC power can be outputted through a cable 320x electrically connected to the inverter 540x. At this time, the cable 320x may include first and second conductive lines 320bx and 320cx, and a ground line 320ax.

According to this, unlike FIG. 2, since the ground line 320ax is further included in the cable 320x, the cable 320x can not be constructed compact.

Also, there is a disadvantage that a separate ground (GND) must be provided for the grounding of the converter 530x and the inverter 540x in the junction box 200x.

9 is an example of a block diagram inside the junction box of Fig.

The power conversion module 700 in the junction box 200 includes a bypass diode 510, a converter 530, a capacitor C1, an inverter 540, and a control unit 550 .

The bypass diode unit 510 includes bypass diodes Dc, Db, Da disposed between the first to fourth conductive lines 135a, 135b, 135c, and 135d of the solar cell module 100, . At this time, it is preferable that the number of the bypass diodes is one or more and smaller than the number of the conductive lines by one.

The bypass diodes Dc, Db and Da are connected to the first to fourth conductive lines 135a, 135b, 135c and 135d in the solar cell module 50, Power is input. The bypass diodes Dc, Db, and Da can be bypassed when a reverse voltage is generated from a DC power source from at least one of the first through fourth conductive lines 135a, 135b, 135c, and 135d have.

Meanwhile, the input power supply Vpv through the bypass diode 510 is input to the converter 530.

The converter 530 can convert the level of the input power supply Vpv output from the bypass diode unit 510 and output the converted DC power.

Accordingly, a level-changed DC power can be stored in the capacitor C1. Both ends of the dc short capacitor C1 may be referred to as a dc stage, and the capacitor C1 may be referred to as a dc short capacitor.

The inverter 540 can convert the direct current power stored in the dc short capacitor C1 into the alternating current power.

On the other hand, according to the drawing, alternating current power can be outputted through the cable 320 electrically connected to the inverter 540. At this time, the cable 320 includes first and second conductive lines 320bx and 320c, and may not include the ground line 320a.

According to this, unlike FIG. 8, since the ground line 320a is not provided in the cable 320, there is an advantage that the cable 320 is configured compactly.

On the other hand, a floating ground FGND formed on the circuit board 37 can be used for grounding the converter 530 and the inverter 540 in the junction box 200 without providing a separate ground GND. Thus, the grounding of the converter 530 and the inverter 540 can be easily realized.

10A is an example of an internal circuit diagram of the junction box of FIG.

Referring to the drawing, Fig. 10A illustrates a tapped inductor converter as converter 530. Fig.

The converter 530 can perform power conversion using the DC power supply Vpv output from the bypass diode unit 510. [

The tap inductor converter 611a includes a tap inductor T1, a switching device S1 connected between the tap inductor T1 and the ground terminal, a diode D1 connected to the output terminal of the tap inductor and performing one- . On the other hand, a dc short capacitor C1 is connected between the output terminal of the diode D1, that is, between the cathode and the ground terminal.

Specifically, the switching element S1 can be connected between the taps of the tap inductor T and the ground terminal. The output terminal (secondary side) of the tap inductor T is connected to the anode of the diode D1 and the dc-side capacitor C1 is connected between the cathode of the diode D1 and the ground terminal do.

On the other hand, the primary side and the secondary side of the tap inductor T have opposite polarities. On the other hand, the tap inductor T may be referred to as a switching transformer.

On the other hand, the primary side and the secondary side of the tap inductor T are connected to each other as shown in the drawing. Thereby, the tap inductor converter can be a non-insulated type converter.

On the other hand, the inverter 540 converts the level-converted DC power from the converter 530 to AC power. In the drawing, a full-bridge inverter is illustrated. Namely, the upper and lower arm switching elements Sa and Sb connected in series to each other and the lower arm switching elements S'a and S'b are paired, and two pairs of upper and lower arm switching elements are connected in parallel to each other (Sa & Sb & S'b). Diodes are connected in anti-parallel to each switching element Sa, S'a, Sb, S'b.

The switching elements in the inverter 540 are turned on / off based on the inverter switching control signal from the controller 550. [ As a result, AC power having a predetermined frequency is output. Preferably, it has a frequency (approximately 60 Hz or 50 Hz) that is equal to the alternating frequency of the grid.

The first filter unit 560 is disposed at an output terminal of the inverter 540 and performs an understanding of low-pass filtering and smoothing of the AC power output from the inverter 540. To this end, in the figure, the inductors Lf1 and Lf2 are exemplified, but various examples are possible.

As a result, electromagnetic noise (EMI) generated in the inverter 540 can be reduced. Further, the electromagnetic noise generated in the circuit board 37 can be reduced.

The converter input current sensing unit A senses an input current ic1 input to the converter 530. The converter input voltage sensing unit B senses an input voltage vc1 input to the converter 530, Lt; / RTI > The sensed input current ic1 and the input voltage vc1 may be input to the control unit 550. [

The converter output current sensing unit C senses an output current ic2 output from the converter 530 or a dc step current and the converter output voltage sensing unit D senses the output current ic2 outputted from the converter 530 And detects the output voltage vc2, i.e., the dc voltage. The sensed output current ic2 and the output voltage vc2 may be input to the control unit 550. [

The inverter output current sensing unit E senses the current ic3 output from the inverter 540 and the inverter output voltage sensing unit F senses the voltage vc3 output from the inverter 540 do. The detected current ic3 and the voltage vc3 are input to the control unit 550. [

On the other hand, the control unit 550 can output a control signal for controlling the switching element S1 of the converter 530 in Fig. In particular, the control unit 550 controls the control unit 550 so that the output voltage vc2 is at least one of the detected input current ic1, the input voltage vc1, the output current ic2, the output voltage vc2, the output current ic3, On timing signal of the switching element S1 in the converter 530 can be output.

On the other hand, the control unit 550 may output an inverter control signal for controlling each of the switching elements Sa, S'a, Sb, S'b of the inverter 540. In particular, the control unit 550 controls the control unit 550 so that the output voltage vc2 is at least one of the detected input current ic1, the input voltage vc1, the output current ic2, the output voltage vc2, the output current ic3, On timing signals of the respective switching elements Sa, S'a, Sb, S'b of the inverter 540 can be outputted based on the above-mentioned signals.

On the other hand, the control unit 550 can control the converter 530 to calculate the maximum power point for the solar cell module 100 and accordingly output the DC power corresponding to the maximum power.

On the other hand, as described above, the floating ground (FGND) formed on the circuit board 37 can be used for grounding the converter 530 and the inverter 540. Thus, the grounding of the converter 530 and the inverter 540 can be easily realized.

10B is another example of the internal circuit diagram of the power conversion module of FIG.

The power conversion module 700b of FIG. 10B includes a bypass diode 510, a converter 530, a dc short capacitor C1, an inverter 540, A second filter unit 550, and a first filter unit 560.

However, unlike the power conversion module 700 of FIG. 10A, the power conversion module 700b of FIG. 10b further includes a second filter portion 565 for reducing noise at an input terminal of the converter 530, .

Since the second filter portion 565 on the input side and the first filter portion 560 on the output side are arranged on the circuit board 37, electromagnetic noise (EMI) generated on the circuit board 37, Can be further reduced.

Fig. 11 is an exploded view of the circuit board of Fig. 2. Fig.

Referring to the drawings, a circuit board 37 according to an embodiment of the present invention may include a plurality of conductive layers 1110 to 1140 that are spaced apart from each other. On the other hand, an insulating layer may be formed between the plurality of conductive layers 1110 to 1140.

In the drawing, a first conductive layer 1110 is formed on the uppermost portion of the plurality of conductive layers 1110 to 1140, a second conductive layer 1120 is formed on the lowermost portion, and a third conductive layer (not shown) on the second conductive layer 1120 1130 and a fourth conductive layer 1140 on the third conductive layer 1130. [

In the first conductive layer 1110, a plurality of circuit elements can be mounted. For example, the bypass diode in the bypass diode section 510, the capacitor C1, the circuit elements in the converter 530, the circuit elements in the inverter 540, The circuit elements of the second filter portion 565, the circuit elements of the input current sensing portion A, the circuit elements of the input voltage sensing portion B, the converter output of the first filter portion 560, Circuit elements of the current detection section C, circuit elements of the converter output voltage detection section D, and the like.

On the other hand, the respective circuit elements can be mounted on the first conductive layer 1110 by soldering, bonding or the like.

The converter 530 and the inverter 540 may be electrically connected to the floating ground FGND formed in the second conductive layer 1120. The second conductive layer 1120 may be formed on the floating ground FGND, .

To this end, the converter 530 and a portion of the inverter 540 mounted on the first conductive layer 1110 are electrically connected through a conductive potion between the first conductive layer 1110 and the second conductive layer 1130 And the second conductive layer 1120, as shown in FIG.

On the other hand, a control signal from the control section 550 can flow to the third conductive layer 1130.

For example, the converter 530 and the inverter 540 can perform the switching operation by the control signal from the control unit 550, respectively.

To this end, the converter 530 and a portion of the inverter 540 mounted on the first conductive layer 1110 are electrically connected through a conductive potion between the first conductive layer 1110 and the third conductive layer 1130 And the third conductive layer 1130, as shown in FIG.

On the other hand, a DC power source or an AC power source can flow to the fourth conductive layer 1140.

The direct current power from the solar cell module 100, the direct current power from the capacitor C1 or the direct current power from the converter 530 and the alternating current power from the inverter 540 are supplied to the fourth conductive layer 1140, , And the like.

Meanwhile, the above-described cable 320 may be electrically connected to the AC power line portion formed in the fourth conductive layer 1140.

A part of the bypass diode unit 510, the capacitor C1, the converter 530 and the inverter 540 mounted on the first conductive layer 1110 is electrically connected to the first conductive layer 1110 and the fourth conductive May be electrically connected to the fourth conductive layer 1140 through a conductive portion between the first conductive layer 1140 and the second conductive layer 1140. [

 On the other hand, it is preferable that the conductive area of the second conductive layer 1120 in which the floating ground (FGND) among the plurality of conductive layers 1110 to 1140 is formed is larger than the conductive area of the other conductive layers.

In the drawing, the conductive lines are formed on the third to fourth conductive layers 1130 and 1140 of the plurality of conductive layers 1110 to 1140, respectively. However, the second conductive layer 1120 may be formed as a separate conductive line , The whole is formed of a conductive member.

If the conductive area of the second conductive layer 1120 in which the floating ground FGND is formed is larger than the conductive area of the other conductive layer among the plurality of conductive layers 1110 to 1140 as described above, It is possible to reduce the electromagnetic noise (EMI).

On the other hand, the second conductive layer 1120 in the circuit board 37 may be able to contact the second insulating case 492 as shown in Fig. Accordingly, the thickness of the junction box 200 can be reduced, and therefore, the junction box 200 can be compactly implemented.

12 is a rear view of a solar module according to another embodiment of the present invention.

Referring to the drawings, a solar module 50M according to another embodiment of the present invention includes a solar cell module 100, a plurality of solar cells 100 disposed on the back surface of the solar cell module 100, A first junction box 1200 having a bypass diode for bypassing a DC power source and a second junction box 1200 which is spaced apart from the first junction box 1200 and converts the DC power from the second junction box 200, And a second junction box 200 for outputting the output signal.

Compared with FIG. 2, there is a difference in that the first junction box 1200 is further provided.

The first junction box 1200 may include a bypass diode 510 including a bypass diode, and may output a DC power source.

The first junction box 1200 may have an insulation case, similar to the junction box 200 of FIG. 2, and a circuit board having a bypass diode 510 in the insulation case may be disposed.

Since the first junction box 1200 is formed of an insulating case, it is not necessary to dispose an additional insulating member in the first junction box 1200, so that the size of the first junction box 1200 can be compactly realized . In particular, the thickness of the first junction box 1200 can be reduced.

The second junction box 200 may include a converter 530, a capacitor C1, an inverter 540 and a control unit 550, a first filter unit 560, a second filter unit 565, have.

A DC power cable 1220 may be disposed between the first junction box 1200 and the second junction box 200 and the DC power cable 1220 may be connected to two conductive lines 1220b, and 1220c. Thus, DC power can be transmitted to the second junction box 200.

The second junction box 200 includes a first insulation case 491 disposed on the back surface of the solar cell module 100 and a second insulation case 492 disposed on the first insulation case 491, A circuit board 37 on which an inverter 540 for converting DC power from a converter 530 to an AC power source is mounted; And a second insulating case 492 which is connected to the circuit board 37 and is disposed on the circuit board 37.

The AC power cable 320 preferably includes the first and second conductive lines 320b and 320c as described above, and preferably does not have a ground line.

12, the solar module 50M of FIG. 12 may further include a plug 300 for supplying AC power from the cable 320 to the external outlet 350, as shown in FIG. At this time, the plug 300 may include first and second protrusions 310b and 310c corresponding to the first and second conductive lines 320b and 320c.

On the other hand, the solar module 50M of FIG. 12 receives AC power from the adjacent solar module 50 and AC power from the cable 320 as shown in FIG. 4, and outputs AC power to the outside And a second cable 330 for externally outputting AC power from the interface unit 342a.

At this time, the second cable 330 includes the third and fourth conductive lines 330bb and 330cb, and preferably does not have a ground line.

The circuit board 37 in the second junction box 200 includes a plurality of conductive layers 1110 to 1140 spaced from each other and the converter 530 and the inverter 540 include a plurality of conductive layers 1110 The converter 530 and the inverter 540 are connected to the floating ground FGND formed in the second conductive layer 1120 spaced apart from the first conductive layer 1110, As shown in Fig.

The second junction box 200 may include a first insulation case 491, a circuit board 37 and a second insulation case 492. The second junction box 200 may include a separate insulation member 491, The size of the second junction box 200 can be compactly implemented. In particular, the thickness of the second junction box 200 can be reduced.

The description of the second junction box 200 will be omitted with reference to FIGS. 2 to 11. FIG.

13 is a rear view of a solar module according to another embodiment of the present invention.

Referring to the drawings, a solar module 50N according to another embodiment of the present invention includes a frame FR fixed to an outer frame of the solar cell module 100, And a junction box 200 disposed on the upper rear frame FRa of the rear frame FR to which DC power from the solar cell module 100 is converted to output AC power.

Compared with Fig. 2, the solar module 50N differs in that the junction box 200 is disposed in the upper rear frame FRa.

The junction box 200 disposed in the side frame FRa includes a first insulating case 491 disposed on the back surface of the solar cell module 100 and a second insulating case 492 disposed on the first insulating case 491, A circuit board 37 on which a converter 530 for converting the level of the DC power from the solar cell module 100 and an inverter 540 for converting the DC power from the converter 530 to AC power are mounted, 1 may be provided with a second insulating case 492 which is joined to the insulating case 491 and is disposed on the circuit board 37. [ In this case, since no separate insulating member is disposed in the insulating case 491 and 492, the size of the junction box 200 can be compactly realized. In particular, the thickness of the junction box 200 can be reduced.

Meanwhile, the cable 320 preferably includes first and second conductive lines 320b and 320c for outputting AC power output from the circuit board 37 to the outside, and does not have a ground line .

The circuit board in the junction box 200 includes a plurality of conductive layers 1110 to 1140 that are spaced apart from each other and the converter 530 and the inverter 540 are connected to each other through a plurality of conductive layers 1110 to 1140, 1 conductive layer 1110 and the converter 530 and the inverter 540 are electrically connected to the floating ground FGND formed in the second conductive layer 1120 spaced apart from the first conductive layer 1110 .

The description of the second junction box 200 will be omitted with reference to FIGS. 2 to 11. FIG.

14 is an exploded perspective view of the solar cell module of FIG.

Referring to FIG. 14, the solar cell module 100 of FIG. 1 may include a plurality of solar cells 130. The first sealing material 120 and the second sealing material 150 located on the lower surface and the upper surface of the plurality of solar cells 130 and the rear substrate 110 and the second sealing material 120 located on the lower surfaces of the first sealing material 120, And may further include a front substrate 160 positioned on the top surface of the sealing member 150.

The solar cell 130 is a semiconductor device that converts solar energy into electrical energy. The solar cell 130 may be a silicon solar cell, a compound semiconductor solar cell, a tandem solar cell, Dye-sensitized or CdTe, CIGS type solar cells, thin film solar cells, and the like.

The solar cell 130 is formed of a light receiving surface on which solar light is incident and a rear surface opposite to the light receiving surface. For example, the solar cell 130 includes a silicon substrate of a first conductivity type, a second conductivity type semiconductor layer formed on the silicon substrate and having a conductivity type opposite to that of the first conductivity type, And a second conductive type semiconductor layer formed on the second conductive type semiconductor layer, wherein the second conductive type semiconductor layer includes a first conductive type semiconductor layer and a second conductive type semiconductor layer, An electrode, and a rear electrode formed on the rear surface of the silicon substrate.

Each solar cell 130 may be electrically connected in series, parallel, or series-parallel. Specifically, a plurality of solar cells 130 can be electrically connected by a ribbon 133. [ The ribbon 133 may be bonded to the front electrode formed on the light receiving surface of the solar cell 130 and the rear electrode collecting electrode formed on the rear surface of another adjacent solar cell 130. [

In the figure, it is illustrated that the ribbon 133 is formed in two lines, and the solar cell 130 is connected in series by the ribbon 133 to form the solar cell string 140.

Thus, as shown in FIG. 1, six strings are formed, and each string may have ten solar cells.

The back substrate 110 may be, but is not limited to, a TPT (Tedlar / PET / Tedlar) type having a waterproof, insulating and ultraviolet shielding function as a back sheet. Although the rear substrate 110 is shown as a rectangular shape in FIG. 4, the rear substrate 110 may be formed in various shapes such as a circular shape and a semicircular shape according to the environment in which the solar cell module 100 is installed.

The first sealing member 120 may be attached to the rear substrate 110 to have the same size as the rear substrate 110 and a plurality of solar cells 130 may be formed on the first sealing member 120 And can be positioned adjacent to each other so as to achieve the same.

The second sealing member 150 may be positioned on the solar cell 130 and may be laminated to the first sealing member 120.

Here, the first sealant 120 and the second sealant 150 allow each element of the solar cell to chemically bond. The first sealing material 120 and the second sealing material 150 can be various examples such as an ethylene vinyl acetate (EVA) film.

On the other hand, the front substrate 160 is preferably placed on the second sealing material 150 so as to transmit sunlight, and is preferably made of tempered glass in order to protect the solar cell 130 from an external impact or the like. Further, it is more preferable to use a low-iron-content tempered glass containing a small amount of iron in order to prevent the reflection of sunlight and increase the transmittance of sunlight.

It is to be understood that the invention is not to be limited in its application to the details of construction and the manner in which the above described embodiments of the invention are put into practice, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention.

Claims (20)

Solar cell module;
A junction box disposed on a rear surface of the solar cell module, for converting a DC power from the solar cell module to output an AC power;
And a first cable electrically connected to the junction box and outputting the AC power,
The junction box includes:
An insulating case made of an insulating material disposed on a rear surface of the solar cell module;
And a circuit board disposed in the insulating case, the circuit board having a converter for converting the level of the DC power from the solar cell module, and an inverter for converting the DC power from the converter to AC power,
Wherein the first cable comprises:
And first and second conductive lines for outputting AC power output from the circuit board to the outside, wherein the first and second conductive lines are not provided with a ground line. The method according to claim 1,
Wherein the insulating case comprises:
Wherein the at least one resin is molded from at least one resin selected from the group consisting of polycarbonate (PC), polyethylene (PE), polyethylene ether (PPE), and polystyrene. The method according to claim 1,
And a connector connected to an end of the first cable for connection to an adjacent solar module or to an outside. The method according to claim 1,
Wherein the insulating case comprises:
A first insulating case for accommodating the circuit board; and a second insulating case formed on the first insulating case and covering the circuit board. The method according to claim 1,
Wherein the converter and the inverter are electrically connected to the floating ground. 5. The method of claim 4,
Wherein an insulating member is not disposed between the first insulating case and the circuit board or between the second insulating case and the circuit board. 5. The method of claim 4,
The junction box includes:
And an insulating member disposed between the first insulating case and the circuit board. The method according to claim 1,
Wherein a coating layer is formed on the back surface of the circuit board. The method according to claim 1,
And a plug for supplying the AC power from the first cable to an external outlet,
Wherein the plug has first and second protrusions corresponding to the first and second conductive lines. The method according to claim 1,
The circuit board includes:
And a plurality of conductive layers spaced from each other,
Wherein the converter and the inverter are connected to the first conductive layer of the plurality of conductive layers,
Wherein the converter and the inverter are electrically connected to a floating ground formed in a second conductive layer spaced apart from the first conductive layer. 11. The method of claim 10,
A controller for controlling the converter and the inverter is further mounted on the circuit board,
And a control signal from the control section flows to a third conductive layer between the first conductive layer and the second conductive layer. 12. The method of claim 11,
And the DC power supply or the AC power supply flows to the fourth conductive layer between the first conductive layer and the third conductive layer. 11. The method of claim 10,
Wherein a conductive area of the second conductive layer in which the floating ground is formed among the plurality of conductive layers is larger than a conductive area of the other conductive layer. The method according to claim 1,
Further comprising a first filter portion for reducing noise in an output terminal of the inverter, on the circuit board. 15. The method of claim 14,
And a second filter portion for noise reduction is further disposed in the input end of the converter. Solar cell module;
A first junction box disposed on a back surface of the solar cell module and having a bypass diode for bypassing the DC power source from the solar cell module;
A second junction box spaced apart from the first junction box to convert a DC power from the first junction box and output an AC power;
And a cable which is electrically connected to the second junction box and outputs the AC power,
The second junction box includes:
An insulating case made of an insulating material disposed on a rear surface of the solar cell module;
And a circuit board disposed in the insulating case, the circuit board having a converter for converting the level of the DC power from the solar cell module, and an inverter for converting the DC power from the converter to AC power,
The cable,
And first and second conductive lines for outputting AC power output from the circuit board to the outside, wherein the first and second conductive lines are not provided with a ground line. 17. The method of claim 16,
The circuit board includes:
And a plurality of conductive layers spaced from each other,
Wherein the converter and the inverter are connected to the first conductive layer of the plurality of conductive layers,
Wherein the converter and the inverter are electrically connected to a floating ground formed in a second conductive layer spaced apart from the first conductive layer. A cable through which an AC power input from an adjacent first solar module flows;
A first connector connected to a connector of a single output cable through which an AC power from the junction box flows, and a second connector for outputting an AC power to an adjacent second solar module, wherein an AC power source An input interface unit;
And a third connector connected to the other end of the cable,
The cable,
The trunk cable comprising first and second conductive lines, and without a ground line. A plurality of solar cell modules;
A plurality of junction boxes for converting direct current power from each of the solar cell modules and outputting an alternating current power;
A plurality of single output cables electrically connected to the respective junction boxes and having first and second conductive lines for outputting the alternating current power supply and not having a ground line;
And a plurality of trunk cables connecting the single output cables of each of the solar cell modules and outputting AC power of the plurality of junction boxes to the outside. 20. The method of claim 19,
Each of the trunk cables,
A cable through which an AC power input from an adjacent first solar module flows;
A first connector connected to a connector of a single output cable through which an AC power from the junction box flows, and a second connector for outputting an AC power to an adjacent second solar module, wherein an AC power source An input interface unit;
And a third connector connected to the other end of the cable,
The cable,
Third, and fourth conductive lines, and does not have a ground line.

Images