KR101788013B1 - Photovoltaic module - Google Patents

Abstract

The present invention relates to a solar module. A solar cell module according to an embodiment of the present invention includes a solar cell module having a plurality of solar cells, a dc / dc converter that is attached to one surface of the solar cell module, converts the level of the DC power supplied from the solar cell module, And a junction box having a converter section, wherein the junction box includes: a switching device for blocking a path for supplying a DC power source to the dc / dc converter section; a DC power source for exposing the junction box to outside of the junction box, And a power supply terminal. This makes it possible to easily measure the characteristics of the solar cell module through the junction box.

Description

{PHOTOVOLTAIC MODULE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar module, and more particularly, to a solar module capable of easily measuring characteristics of the solar module through a junction box.

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.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a solar module capable of easily measuring characteristics of a solar cell module through a junction box.

It is another object of the present invention to provide a solar module including a converter unit for performing DC power level conversion in a junction box attached to the solar cell module.

According to an aspect of the present invention, there is provided a solar module including: a solar cell module having a plurality of solar cells; a solar cell module mounted on one surface of the solar cell module, And a dc / dc converter unit for outputting the dc / dc converter unit. The junction box includes a switching device for blocking a path for supplying DC power to the dc / dc converter unit, And a DC power supply terminal for outputting a DC power supply.

According to another aspect of the present invention, there is provided a solar module including: a solar cell module having a plurality of solar cells; a solar cell module mounted on one surface of the solar cell module, And a dc / dc converter for converting the output of the dc / dc converter to a level, and the junction box is exposed to the outside of the junction box. When the path for supplying DC power to the dc / dc converter is blocked, And a ground terminal exposed to the outside of the junction box.

According to the embodiment of the present invention, when the path of the DC power supplied from the solar cell module is changed, the DC power source terminal for outputting the DC power to the outside is provided so that the characteristics of the solar cell module can be easily measured .

On the other hand, since the DC-DC power supply has a switching element that cuts off the path to the dc / dc converter, the path can be easily changed.

On the other hand, the DC power source terminal can be protected by providing the waterproof cap covering the DC power source terminal exposed to the outside.

On the other hand, the DC power source terminal is attached to the lower portion of the junction box and exposed in the direction of the ground, so that the DC power source terminal can be protected from foreign matter or the like.

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 exploded perspective view of the solar cell module of FIG.
4 is an example of a bypass diode configuration of the solar module of FIG.
5 is a block diagram briefly illustrating the connection of the solar module and the characteristic measurement circuit of FIG.
6 is an example of an internal circuit diagram of the junction box of the solar module shown in Fig.
Figure 7 illustrates an example of connection of a junction box and a characteristic measurement circuit.
Figure 8 illustrates another example of the connection of a junction box and a particular measuring circuit.
9 shows a characteristic curve of the solar module.
10 is an example of a configuration diagram of a solar photovoltaic system according to an embodiment of the present invention.
FIG. 11 is another example of the configuration of a solar photovoltaic system according to an embodiment of the present invention.

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, FIG. 2 is a rear view of the solar module of FIG. 1, and FIG. 3 is an exploded perspective view of the solar module of FIG.

1 to 3, a solar module 50 according to an embodiment of the present invention includes a solar cell module 100 and a junction box 200 located on one side of the solar cell module 100 . The solar module 50 may further include a heat dissipating member (not shown) disposed between the solar cell module 100 and the junction box 200.

First, the solar cell module 100 may include a plurality of solar cells 130. The first sealing member 120 and the second sealing member 140 located on the lower surface of the plurality of solar cells 130 and the upper surface of the rear substrate 110 and the second sealing member 140 located on the lower surfaces of the first sealing member 120, And a front substrate 160 positioned on the upper surface of the sealing member 140. [

First, the solar cell 130 is a semiconductor device that converts solar energy into electrical energy. The solar cell 130 includes a silicon solar cell, a compound semiconductor solar cell, A tandem solar cell, or 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, An antireflection film formed on the second conductive type semiconductor layer and having at least one opening exposing a part of the surface of the second conductive type semiconductor layer; 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. By this, six strings 140a, 140b, 140c, 140d, 140e and 140f are formed, and each string includes ten solar cells. Unlike the drawings, various modifications are possible.

On the other hand, each solar cell string can be electrically connected by a bus ribbon. 1 shows a first solar cell string 140a and a second solar cell string 140b respectively formed by bus ribbons 145a, 145c and 145e disposed under the solar cell module 100, The battery string 140c and the fourth solar cell string 140d illustrate that the fifth solar cell string 140e and the sixth solar cell string 140f are electrically connected. 1 shows the second solar cell string 140b and the third solar cell string 140c respectively by the bus ribbons 145b and 145d disposed on the top of the solar cell module 100, And that the battery string 140d and the fifth solar cell string 140e are electrically connected.

On the other hand, the ribbon connected to the first string, the bus ribbons 145b and 145d, and the ribbon connected to the fourth string are electrically connected to the first through fourth conductive lines 135a, 135b, 135c, and 135d, respectively The first to fourth conductive lines 135a, 135b, 135c and 135d are connected to the bypass diodes Da, Db, Dc and Dd in the junction box 200 arranged on the back surface of the solar cell module 100, do. In the drawing, the first through fourth conductive lines 135a, 135b, 135c, and 135d extend through the openings formed on the solar cell module 100 to the back surface of the solar cell module 100. FIG.

It is preferable that the junction box 200 is disposed closer to an end of the solar cell module 100 where the conductive lines extend.

1 and 2, since the first to fourth conductive lines 135a, 135b, 135c, and 135d extend from the top of the solar cell module 100 to the back surface of the solar cell module 100, ) Is located at the upper part of the back surface of the solar cell module 100. FIG. Thereby, the length of the conductive line can be reduced, and the power loss can be reduced.

1 and 2, when the first to fourth conductive lines 135a, 135b, 135c, and 135d extend from the bottom of the solar cell module 100 to the back surface of the solar cell module 100, The solar cell module 200 may be positioned at the lower part of the back surface of the solar cell module 100.

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. 3, the rear substrate 110 may be formed in various shapes such as a circular shape or a semicircular shape depending on the environment in which the solar cell module 100 is installed.

The first sealing material 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 material 120 And can be positioned adjacent to each other so as to achieve the same.

The second sealing member 140 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 140 allow each element of the solar cell to chemically bond. The first sealing material 120 and the second sealing material 140 may 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 140 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.

The junction box 200 is mounted on the back surface of the solar cell module 100 and can be power-converted using the DC power supplied from the solar cell module 100. Specifically, it may include a dc / dc converter unit (230 in FIG. 6) for level-converting and outputting a DC power supply. In addition, the junction box 200 may include bypass diodes (Da, Db, Dc) that prevent current flow between the solar cell strings from flowing backward. In addition, the junction box 200 may further include a capacitor unit (220 in FIG. 6) for storing DC power. Further, it may further comprise an inverter unit (240 in Fig. 6) for converting a direct current power source into an alternating current power source. This will be described later with reference to FIG.

As described above, the junction box 200 according to the embodiment of the present invention may include at least the bypass diodes Da, Db, and Dc and the dc / dc converter unit 230 (FIG. 6). When the junction box 200 is formed integrally with the solar cell module 100, the loss of the DC power generated in each solar cell module 100 is minimized, as in the solar cell system shown in FIG. 11 or FIG. So that it can be efficiently managed. On the other hand, the junction box 200 integrally formed can be called a MIC (Module Integrated Converter) circuit.

The junction box 200 includes at least the bypass diodes Da, Db, and Dc and the dc / dc converter unit 230 (FIG. 6), so that a separate method for measuring the solar module characteristics is required do.

For this, the junction box 200 according to the embodiment of the present invention includes a switching device 205 that cuts off the path of the DC power supplied from the solar cell module 100 to the dc / dc converter unit 230 . In addition, the junction box 200 may include a DC power supply terminal 207 exposed to the outside of the junction box and outputting a DC power when the path is cut off. Further, it may further include a ground terminal 209 exposed to the outside of the junction box.

For example, when the switching device 205 operates, the path between the bypass diodes Da, Db, and Dc connected to each other and the dc / dc converter unit 230 (FIG. 6) may be cut off. In particular, the DC power supplied from the solar cell module 100 may be supplied to the DC power supply terminal 207 exposed to the outside, rather than the dc / dc converter portion 230 (FIG. 6). By the switching operation of the switching element 205, circuit elements below the dc / dc converter unit 230 in the junction box 200 are bypassed.

Thereby, a characteristic measuring circuit (PV simulator) 300 for measuring the characteristics of the solar cell module 100 to be described later is connected to the DC power supply terminal 207 and the ground terminal 209, .

On the other hand, the switching element 205 may include a button switch or a rotary switch which is exposed to the outside of the junction box. In Fig. 2, the button switch 205 is exemplified as a switching element. The button switch 205 is connected to the dc / dc converter unit 230 or the DC power supply terminal 207 via the bypass diode Da, Db or Dc. Can be used to change.

For example, when the button switch 205 is depressed, the path to the dc / dc converter unit 230 is cut off, and the DC power supply can be operated to be outputted to the DC power supply terminal 207. As another example, when the button switch 205 is pressed once more, the path can be adjusted again so that the DC power is outputted to the dc / dc converter unit 230. In this case, DC power is not output to the DC power supply terminal 207.

Although not shown in the drawings, it is also possible to maintain the path to the dc / dc converter section 230 or to maintain the path to the DC power supply terminal 207 by using a rotary switch (not shown).

2, the junction box 200 may further include a waterproof cap (not shown) that is detachable and covers the DC power source terminal 207. In addition, The waterproof cap can be peeled off only at the time of measurement, and other substances such as moisture are prevented from being adsorbed to the DC power terminal 207. Thus, the DC power source terminal can be protected.

On the other hand, the waterproof cap (not shown) may also be attached to the ground terminal 209.

2, a DC power supply terminal 207 and a ground terminal 209 are connected to a junction box 207 and a ground terminal 209 to prevent foreign substances from being attracted to the DC power supply terminal 207 and the ground terminal 209 exposed to the outside, And may be exposed to the ground.

Meanwhile, a method for measuring a solar module characteristic according to an embodiment of the present invention will be described in detail with reference to FIG. 6 below.

On the other hand, in order to prevent moisture penetration of the circuit elements in the junction box 200, a coating for preventing moisture permeation may be performed using silicon or the like inside the junction box.

The first through fourth conductive lines 135a, 135b, 135c and 135d are connected to bypass diodes Da, Db, Dc and Dd (not shown) in the junction box, ).

In the operation of the junction box 200, a high temperature is generated from the bypass diodes Da, Db, Dc, and Dd, and the generated heat is generated by a specific solar cell 200 arranged at a position where the junction box 200 is attached. Thereby reducing the efficiency of the light emitting device 130.

In order to prevent this, the solar module 50 according to the embodiment of the present invention may further include a heat dissipating member (not shown) disposed between the solar cell module 100 and the junction box 200. In order to disperse the heat generated in the junction box 200, the cross sectional area of the heat dissipating member 400 is preferably larger than the cross sectional area of the junction box 200. For example, on the entire rear surface of the solar cell module 100. The heat dissipating member (not shown) is preferably formed of a metal material such as gold (Au), silver (Ag), copper (Cu), aluminum (Al), tungsten (W) or the like with good thermal conductivity.

On the other hand, an external connection terminal (not shown) for outputting a power-converted DC power or an AC power to the outside may be formed on one side of the junction box 160.

4 is an example of a bypass diode configuration of the solar module of FIG.

Referring to the drawings, bypass diodes Da, Db, and Dc may be connected corresponding to six solar cell strings 140a, 140b, 140c, 140d, 140e, and 140f. Specifically, the first bypass diode Da is connected between the first solar cell string and the first bus ribbon 145a, and is connected to the first solar cell string 140a or the second solar cell string 140b When the reverse voltage is generated, the first solar cell string 140a and the second solar cell string 140b are bypassed.

For example, when a voltage of approximately 0.6 V generated in a normal solar cell is generated, the potential of the cathode electrode is approximately 12 V (= 0.6 V * 20), as compared with the potential of the anode electrode of the first bypass diode Da Lt; / RTI > That is, the first bypass diode Da operates normally, not bypass.

On the other hand, when a hot spot occurs due to shading or foreign matter adhering to any solar cell of the first solar cell string 140a, the voltage generated in any one solar cell is approximately 0.6V (About -15 V), rather than a voltage of about < / RTI > Accordingly, the potential of the anode electrode of the first bypass diode Da becomes higher by about 15 V than that of the cathode electrode. Accordingly, the first bypass diode Da performs the bypass operation. Therefore, the voltage generated in the solar cell in the first solar cell string 140a and the second solar cell string 140b is not supplied to the junction box 200. [ In this way, when a reverse voltage generated in some solar cells is generated, it is possible to prevent destruction of the solar cell or the like by bypassing. In addition, except for the hot spot region, it is possible to supply the generated DC power.

Next, the second bypass diode Db is connected between the first bus ribbon 145a and the second bus ribbon 145b, and is connected to the third solar cell string 140c or the fourth solar cell string 140d When the reverse voltage is generated, the third solar cell string 140c and the fourth solar cell string 140d are bypassed.

Next, the third bypass diode Dc is connected between the first solar cell string and the first bus ribbon 145a, and is connected to the first solar cell string 140a or the second solar cell string 140b When the voltage is generated, the first solar cell string and the second solar cell string are bypassed.

4, unlike FIG. 4, six bypass diodes can be connected corresponding to six solar cell strings, and various other modifications are possible.

Fig. 5 is a block diagram briefly illustrating the connection between the solar module and the characteristic measuring circuit of Fig. 1, Fig. 6 is an example of an internal circuit diagram of the junction box of the solar module of Fig. 1, Fig. 8 illustrates an example of circuit connection, Fig. 8 illustrates another example of connection of a junction box with a specific measurement circuit, and Fig. 9 shows a characteristic curve of the solar module.

5, in order to understand the characteristics of the solar module 50, specifically, the open-circuit voltage Voc and the short-circuit current Isc characteristic curve L supplied from the solar cell module 100, A characteristic measuring circuit (PV simulator) 300 is used.

The characteristic measuring circuit 300 shown in Fig. 7 or 8 can be operated as follows.

For example, when the characteristic measuring circuit 300 is connected directly to the solar cell module 100, during the first period, the first switching device Sl is turned off, the second switching device Sm is turned on . As a result, the voltage Vc1 remaining in the capacitor C1 is consumed in the resistor R1. As a result, the voltage Vc1 across the capacitor C1 becomes 0V.

Next, during the second period, the first switching element Sl is turned on and the second switching element Sm is turned off. The voltage Vc1 across the capacitor C1 is 0 V at the time point when the first switching device S1 is turned on so that the capacitor C1 operates in a short state. Therefore, when the current ic1 flowing between the first switching element Sl and the capacitor C1 is detected by using the current detecting section A, the short circuit current Isc is detected.

Thereafter, due to the current flowing in the capacitor C1, electric charge is accumulated in the capacitor C1 and the voltage Vc1 across the capacitor C1 rises. At this time, the potential difference between the supplied DC voltage and the both-end voltage Vc1 of the capacitor C1 is reduced, and the flowing current ic1 is reduced. As a result, a constant voltage (the same voltage as the supplied DC voltage) . At this time, when the voltage Vc1 at both ends of the capacitor C1 is detected using the voltage detection unit B, the open-circuit voltage Voc due to the constant voltage is detected.

The short-circuit current Isc and the open-circuit voltage Voc characteristic curve L can be illustrated as shown in Fig. On the other hand, a point at which the maximum power is generated in the solar cell module is referred to as an optimum operating point (mpp), a corresponding voltage is referred to as a maximum output operating voltage (Vmpp), and a corresponding current is referred to as a maximum output operating current .

Meanwhile, the turn-on / off timing of the first switching device Sl and the second switching device Sm is controlled by the control unit 310 in the characteristic measuring circuit 300. The control unit 310 receives the current ic1 detected by the current detecting unit A and receives the voltage Vc1 at both ends of the capacitor C1 detected by the voltage detecting unit B.

Meanwhile, an internal circuit diagram of the junction box 200 according to the embodiment of the present invention can be illustrated as shown in FIG.

The junction box 200 may include a bypass diode unit 210, a switching device 205, and a dc / dc converter unit 230. In addition, it may further include a capacitor unit 220 and an inverter unit 240.

For example, in the case where the junction box 200 includes the bypass diode unit 210, the capacitor unit 220, and the dc / dc converter unit 230 except for the inverter unit 240, 200 can output DC power. In this case, when the junction box 200 performs a power optimizing function, the junction box 200 may be called a power optimizer.

On the other hand, when the junction box 200 includes the inverter unit 240, the junction box 200 outputs AC power. The junction box 200 may be referred to as a micro inverter.

The bypass diode unit 210 includes first to fourth conductive lines arranged between angles of the a-node, the b-node, the c-node and the d-node corresponding to the first to fourth conductive lines 135a, 135b, 135c and 135d, And third bypass diodes Da, Db, and Dc.

The capacitor unit 220 stores the DC power supplied from the solar cell module 100. Although three capacitors Ca, Cb and Cc are connected in parallel in the figure, they may be connected in series or in series-parallel combination.

 The dc / dc converter unit 230 performs level conversion using the DC power stored in the capacitor unit 220. In the figure, a flyback converter using the turn-on timing of the switching element S1 and the winding ratio of the transformer T is illustrated. Thereby, the dc level boosting can be performed. Meanwhile, a converter control unit (not shown) for controlling the turn-on timing of the switching element S1 may be further provided.

The dc / dc converter unit 230 may be a boost converter, a buck converter, a forward converter, or the like in addition to the flyback converter shown in the drawing. For example, Cascaded Buck-Boost Converter, etc.).

The inverter unit 240 converts the level-converted DC power supply into an AC power supply. 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 unit 240 are turned on / off based on the inverter switching control signal from the inverter control unit (not shown). As a result, AC power having a predetermined frequency is output. Preferably, it has a frequency (approximately 60 Hz) equal to the alternating frequency of the grid.

Meanwhile, a capacitor unit (not shown) may be additionally provided between the dc / dc converter unit 230 and the inverter unit 240 to store the level-converted dc power. The capacitor unit (not shown) may include a plurality of capacitors, similar to the capacitor unit 220 described above.

In the embodiment of the present invention, since the junction box 200 having the dc / dc converter 230 is connected to the solar cell module 100, the output terminal of the junction box 200 (e-node, f- (G-node, h-node) of the characteristic measuring circuit 300 is connected to the input terminal (g-node, h-node) of the solar cell module 100 as shown in FIG. 7, the characteristics of the solar cell module 100 can not be known accurately due to various circuit elements.

In order to prevent this, in the embodiment of the present invention, the circuit elements in the junction box 200 are controlled to be bypassed by using the switching device 205 or the like.

The switching device 205 is disposed between the bypass diode unit 210 and the capacitor unit 220 and allows the DC power source through the bypass diode unit 210 to flow to the capacitor unit 220, To the exposed DC power supply terminal (207). To this end, the switching element 205 may be implemented as a relay element.

Depending on the operation of the switching element 205, the x node may be in conduction with the y node (in the case of Fig. 7) or the x node may be in conduction with the z node (in the case of Fig. 8).

For example, when the switching element, particularly the button switch 205, is pressed, the x-node is electrically connected to the z-node (corresponding to Fig. 8) to cut off the path of the dc / dc converter unit 230, DC power supply terminal 207 as shown in Fig.

As another example, when the button switch 205 is pressed again, the x-node is electrically connected to the y-node (corresponding to Fig. 7), and the path can be adjusted again so that the DC power is output to the dc / dc converter unit 230 have. In this case, DC power is not output to the DC power supply terminal 207.

8 shows a bypass mode in which the bypass output terminal of the junction box 200, that is, the DC power supply terminal 207 (z node) and the ground terminal 209 are connected to the input terminal of the characteristic measuring circuit 300 , h-node).

Thus, the direct current power output from the solar cell module 100 can be directly connected to the characteristic measuring circuit 300. Thus, the characteristics of the solar cell module 100 can be grasped accurately.

On the other hand, even when the junction box 200 does not include the inverter 240 and only the dc / dc converter 230 is provided, the bypass output of the junction box 200, that is, The node 207 and the ground terminal 209 can be connected to the input terminals (g-node, h-node) of the characteristic measuring circuit 300, respectively.

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

Referring to the drawings, the solar photovoltaic system of FIG. 10 includes a plurality of solar modules 50a, 50b, ..., 50n. Each solar module 50a, 50b, ..., 50n may include junction boxes 200a, 200b, ..., 200n for outputting AC power. The junction boxes 200a, 200b, ..., and 200n may be microinverters. The AC power output from the junction boxes 200a, 200b, ..., 200n may be supplied to the grid .

Meanwhile, the connection method of the junction box 200 and the characteristic measurement circuit 300 of FIG. 8 according to the embodiment of the present invention can be applied to the microinverter of FIG.

FIG. 11 is another example of the configuration of a solar photovoltaic system according to an embodiment of the present invention.

Referring to the drawings, the solar photovoltaic system of Fig. 11 includes a plurality of solar modules 50a, 50b, ..., 50n. Each solar module 50a, 50b, ..., 50n may include junction boxes 1200a, 1200b, ..., 1200n for outputting DC power. In addition, an inverter unit 1210 for converting DC power outputted from each of the solar module modules 50a, 50b, ..., 50n into AC power is further provided. At this time, the junction boxes 1200a, 1200b, ..., and 1200n can perform power optimization for efficiently outputting DC power.

Meanwhile, the connection method of the junction box 200 and the characteristic measurement circuit 300 of FIG. 8 according to the embodiment of the present invention can be applied to the power optimizer of FIG.

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 (12)

A solar cell module comprising a plurality of solar cells; And
And a junction box attached to one surface of the solar cell module, the junction box having a dc / dc converter unit for level-converting and outputting a DC power supplied from the solar cell module,
The junction box includes:
A switching device operating in a first mode in which the direct current power is supplied to the dc / dc converter part or in a second mode in which the direct current power is supplied to the dc / dc converter part; And
And a DC power supply terminal exposed to the outside of the junction box and outputting the DC power obtained through the switching element to the outside when the path is cut by the second mode,
And the DC power supply is supplied to the dc / dc converter section via the switching element in the first mode operation of the switching element. The method according to claim 1,
And a ground terminal exposed to the outside of the junction box. The method according to claim 1,
The switching device includes:
And a button switch or a rotary switch which is exposed outside the junction box and changes the path. The method according to claim 1,
The junction box includes:
And a waterproof cap which is detachable and covers the DC power source terminal. The method according to claim 1,
Wherein the DC power terminal is attached to a lower portion of the junction box and is exposed in a ground direction. The method according to claim 1,
In the solar cell module,
A bus ribbon connected to a solar cell string formed by connecting a part of the plurality of solar cells in a line; And
And a conductive line electrically connecting the bus ribbon and the junction box to each other. The method according to claim 6,
The junction box includes:
Wherein the conductive line is disposed adjacent to an end of the conductive line extending from both ends of the solar cell module. The method according to claim 1,
The junction box includes:
And a bypass diode for bypassing some solar cells among the plurality of solar cells. 9. The method of claim 8,
The switching device includes:
And disconnects the path between the bypass diode and the dc / dc converter unit. The method according to claim 1,
The junction box includes:
And a capacitor unit for storing the DC power supplied from the solar cell module. The method according to claim 1,
The junction box includes:
And an inverter unit converting the level-converted DC power into AC power and outputting the AC power. delete

Images