KR20120116155A - Photovoltaic module - Google Patents

Abstract

PURPOSE: A solar module is provided to easily change a path by installing a switching element blocking a path of DC power supplied to a DC/DC converter unit. CONSTITUTION: A solar cell module includes a plurality of solar cells. A junction box(200) includes a DC/DC converter unit(230) converting the level of DC power supplied from the solar cell module. The junction box is attached on one surface of the solar cell module. The junction box includes a switching element(205) and a DC power terminal. The switching element blocks the path of the DC power supplied to the DC/DC converter unit. The DC power terminal is exposed to the outside of the junction box.

Description

Solar Modules {Photovoltaic module}

The present invention relates to a solar module, and more particularly, to a solar module that can easily measure the characteristics of the solar cell module through the junction box.

Recently, with the anticipation of depletion of existing energy sources such as oil and coal, there is increasing interest in alternative energy to replace them. Among them, solar cells are in the spotlight as next generation cells that directly convert solar energy into electrical energy using semiconductor devices.

On the other hand, the photovoltaic module refers to a state in which solar cells for photovoltaic power generation are connected in series or in parallel, and the photovoltaic module may include a junction box for collecting electricity produced by the solar cells.

An object of the present invention is to provide a solar module that can easily measure the characteristics of the solar cell module through the junction box.

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

A solar module according to an embodiment of the present invention for achieving the above object, the solar cell module having a plurality of solar cells, attached to one surface of the solar cell module, level conversion of the DC power supplied from the solar cell module And a junction box having a dc / dc converter unit for outputting the same, wherein the junction box includes a switching element that blocks a path from which DC power is supplied to the dc / dc converter unit, and is exposed to the outside of the junction box, It further includes a DC power supply terminal for outputting a DC power supply.

In addition, the solar module according to an embodiment of the present invention for achieving the above object is a solar cell module having a plurality of solar cells, and attached to one surface of the solar cell module, the DC power supplied from the solar cell module And a junction box having a dc / dc converter for outputting a level conversion, and the junction box is exposed to the outside of the junction box and outputs a direct current power when a path to which the direct current power is supplied to the dc / dc converter is blocked. It further comprises a DC power terminal, and a ground terminal exposed to the outside of the junction box.

According to an embodiment of the present invention, when the path of the DC power supplied from the solar cell module is changed, by providing a DC power terminal for outputting the DC power to the outside, it is easy to measure the characteristics of the solar cell module through the junction box You can do it.

On the other hand, by including a switching element for blocking the path to the DC power supply to the dc / dc converter, it is possible to easily change the path.

On the other hand, by providing a waterproof cap covering the DC power terminal exposed to the outside, it is possible to protect the DC power terminal.

On the other hand, the DC power supply terminal is attached to the lower portion of the junction box to be exposed in the ground direction, thereby protecting the DC power supply terminal from foreign matters.

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. 1.
4 is an example of a bypass diode configuration of the solar module of FIG. 1.
FIG. 5 is a block diagram schematically illustrating the connection of the solar module and the characteristic measurement circuit of FIG. 1.
6 is an example of an internal circuit diagram of a junction box of the solar module of FIG. 1.
7 illustrates an example of connection of a junction box and a characteristic measurement circuit.
8 illustrates another example of the connection of a junction box and a particular measurement circuit.
9 shows a characteristic curve of the solar module.
10 is an example of configuration diagram of a solar system according to an embodiment of the present invention.
11 is another example of a configuration diagram of a solar system according to an embodiment of the present invention.

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

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.

1 is a front view of a solar module according to an embodiment of the present invention, Figure 2 is a rear view of the solar module of Figure 1, Figure 3 is an exploded perspective view of the solar cell module of FIG.

1 to 3, the solar module 50 according to the embodiment of the present invention includes a solar cell module 100 and a junction box 200 located on one surface of the solar cell module 100. . In addition, the solar module 50 may further include a heat dissipation 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. In addition, the first sealing member 120 and the second sealing member 140 positioned on the lower surface and the upper surface of the plurality of solar cells 130, the rear substrate 110 and the second positioned on the lower surface of the first sealing member 120. It may further include a front substrate 160 located on the upper surface of the sealing material 140.

First, the solar cell 130, the solar cell 130 is a semiconductor device that converts solar energy into electrical energy, such as silicon solar cells, compound semiconductor solar cells, and stacked solar cells. And a tandem solar cell.

The solar cell 130 is formed of a light receiving surface on which sunlight is incident and a rear surface opposite to the light receiving surface. For example, the solar cell 130 includes a first conductive silicon substrate, a second conductive semiconductor layer formed on the silicon substrate and having a conductivity opposite to the first conductive type, and the second conductive semiconductor layer. An anti-reflection film formed on the second conductivity-type semiconductor layer, the at least one opening exposing at least one surface thereof, and a front electrode contacting a part of the second conductivity-type semiconductor layer exposed through the at least one opening; It may include a back electrode formed on the back of the silicon substrate.

Each solar cell 130 may be electrically connected in series or in parallel or in parallel. Specifically, the plurality of solar cells 130 may be electrically connected by the 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 current collecting electrode formed on the back surface of another adjacent solar cell 130.

In the figure, the ribbon 133 is formed in two lines, by the ribbon 133, the solar cells 130 are connected in a row, illustrating that the solar cell string 140 is formed. As a result, 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. FIG. 1 shows that the first solar cell string 140a and the second solar cell string 140b are formed by the bus ribbons 145a, 145c, and 145e disposed under the solar cell module 100, respectively. 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. In addition, in FIG. 1, the 2nd solar cell string 140b and the 3rd solar cell string 140c are respectively comprised by the bus ribbon 145b, 145d arrange | positioned on the upper part of the solar cell module 100, The 4th aspect It illustrates 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 to fourth conductive lines 135a, 135b, 135c, and 135d, respectively. And 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 disposed on the rear surface of the solar cell module 100. do. In the drawings, the first to fourth conductive lines 135a, 135b, 135c, and 135d extend to the rear surface of the solar cell module 100 through openings formed on the solar cell module 100.

On the other hand, it is preferable that the junction box 200 is further disposed adjacent to an end portion of which the conductive line extends from both ends of the solar cell module 100.

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 rear surface of the solar cell module 100, the junction box 200 may be used. ) Illustrates that the solar cell module 100 is located above the back of the solar cell module 100. As a result, the length of the conductive line can be reduced, and power loss can be reduced.

Unlike FIGS. 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 rear surface of the solar cell module 100, the junction box The 200 may be located at the lower side of the rear surface of the solar cell module 100.

The back substrate 110 is a back sheet, and functions as a waterproof, insulation, and UV protection, and may be a TPT (Tedlar / PET / Tedlar) type, but is not limited thereto. In addition, although the rear substrate 110 is shown in a rectangular shape in FIG. 3, the rear substrate 110 may be manufactured in various shapes such as a circle and a semi-circle according to an environment in which the solar cell module 100 is installed.

On the other hand, the first sealing material 120 may be attached to the same size as the rear substrate 110 on the rear substrate 110, the plurality of solar cells 130 on the first sealing material 120 is a few rows. Can be located next to each other to achieve.

The second sealing member 140 may be positioned on the solar cell 130 to be bonded to the first sealing member 120 by lamination.

Here, the first sealant 120 and the second sealant 140 allow each element of the solar cell to chemically bond. The first sealant 120 and the second sealant 140 may be various examples such as an ethylene vinyl acetate (EVA) film.

On the other hand, the front substrate 160 is located on the second sealing material 140 so as to transmit sunlight, it is preferable that the tempered glass in order to protect the solar cell 130 from an external impact. In addition, it is more preferable that it is a low iron tempered glass containing less iron in order to prevent reflection of sunlight and increase the transmittance of sunlight.

The junction box 200 is attached to the rear surface of the solar cell module 100 and may convert power using a DC power supplied from the solar cell module 100. Specifically, a dc / dc converter (230 of FIG. 6) for level conversion of a DC power supply may be provided. In addition, the junction box 200 may include bypass diodes Da, Db, and Dc that prevent current from flowing back between the strings of the solar cells. In addition, the junction box 200 may further include a capacitor unit 220 (refer to FIG. 6) that stores the DC power. In addition, an inverter unit (240 of FIG. 6) for converting DC power into AC power may be further provided. This will be described later with reference to FIG. 6.

As described above, the junction box 200 according to the exemplary embodiment of the present invention may include at least bypass diodes Da, Db, and Dc, and a dc / dc converter (230 of FIG. 6). When the junction box 200 is integrally formed with the solar cell module 100, as in the solar system of FIG. 11 or 12, which will be described later, the loss of DC power generated in each solar cell module 100 is minimized. It can be managed efficiently. Meanwhile, the junction box 200 integrally formed may be referred to as a module integrated converter (MIC) circuit.

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

To this end, the junction box 200 according to the embodiment of the present invention, the switching element 205 for blocking the path that the DC power supplied from the solar cell module 100 is supplied to the dc / dc converter 230. It may include. In addition, the junction box 200 may include a DC power terminal 207 that is exposed to the outside of the junction box and outputs DC power when the path is blocked. In addition, it may further include a ground terminal 209 exposed to the outside of the junction box.

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

Accordingly, a characteristic measuring circuit (PV simuulator) 300 for measuring the characteristics of the solar cell module 100, which will be described later, is connected to the DC power supply terminal 207 and the grounding terminal 209 to easily measure the characteristics. You can do it.

On the other hand, the switching element 205 may be provided with a button switch or a rotary switch exposed to the outside of the junction box. In FIG. 2, the button switch 205 is illustrated as a switching element. The button switch 205 is exposed to the outside of the junction box, and routes the DC power supply via the bypass diodes Da, Db, and Dc to the dc / dc converter 230 or the DC power supply terminal 207. Can be used to change.

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

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

Meanwhile, although not shown in FIG. 2, the junction box 200 may be detachable and further include a waterproof cap (not shown) covering the DC power terminal 207. The waterproof cap may be peeled off only during measurement, and other foreign matters such as moisture may not be absorbed by the DC power supply terminal 207. Therefore, the DC power supply terminal can be protected.

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

In addition, the DC power terminal 207 and the ground terminal 209 are junction boxes as shown in FIG. 2 in order to prevent foreign substances or the like from being adsorbed to the DC power terminal 207 and the ground terminal 209 exposed to the outside. Attached to the lower portion of the 200 may be exposed in the ground direction.

On the other hand, a method for measuring solar module characteristics according to an embodiment of the present invention will be described in more detail below with reference to FIG.

Meanwhile, in order to prevent moisture penetration of circuit elements in the junction box 200, the inside of the junction box may be coated with a moisture barrier to prevent moisture penetration.

On the other hand, an opening (not shown) is formed in the junction box 200 so that the above-described first to fourth conductive lines 135a, 135b, 135c, and 135d are bypass diodes Da, Db, Dc, and Dd in the junction box. ) Can be connected.

Meanwhile, when the junction box 200 is operated, high heat is generated from the bypass diodes Da, Db, Dc, and Dd, and the generated heat is a specific solar cell arranged at the position where the junction box 200 is attached. The efficiency of 130 can be reduced.

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

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

4 is an example of a bypass diode configuration of the solar module of FIG. 1.

Referring to the drawings, the bypass diodes Da, Db, and Dc may be connected to the 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, so that the first solar cell string 140a or the second solar cell string 140b is connected. 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 0.6V generated in a normal solar cell occurs, the potential of the cathode electrode is about 12V (= 0.6V * 20) relative to the potential of the anode electrode of the first bypass diode Da. Becomes higher. That is, the first bypass diode Da performs normal operation instead of bypass.

On the other hand, in one solar cell of the first solar cell string 140a, when a hot spot occurs due to shading or foreign matter adheres, the voltage generated in one solar cell is approximately 0.6V. The reverse voltage (approximately -15V) is generated rather than the voltage of. Accordingly, the potential of the anode electrode of the first bypass diode Da becomes about 15V higher than that of the cathode electrode. Accordingly, the first bypass diode Da performs the bypass operation. Therefore, the voltage generated by the solar cells in the first solar cell string 140a and the second solar cell string 140b is not supplied to the junction box 200. As described above, when a reverse voltage generated in some solar cells is generated, bypassing can prevent destruction of the solar cell. In addition, except for the hot spot region, the generated DC power can be supplied.

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

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

5 is a block diagram schematically illustrating the connection of the solar module and the characteristic measurement 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, and FIG. 7 is a junction box and characteristic measurement. One example of a circuit connection is illustrated, and FIG. 8 illustrates another example of the connection of a junction box and a specific measurement circuit, and FIG. 9 shows a characteristic curve of the solar module.

Referring to Figure 5, in order to determine the characteristics of the sun and the module 50, specifically, the open voltage (Voc) and the short-circuit current (Isc) characteristic curve (L) supplied from the solar cell module 100, Characteristic measurement circuit (PV simuulator) 300 is used.

The characteristic measurement circuit 300 illustrated in FIG. 7 or 8 may be operated as follows.

For example, when the characteristic measurement circuit 300 is directly connected to the solar cell module 100, during the first period, the first switching device Sl is turned off and the second switching device Sm is turned on. Let's do it. As a result, the voltage Vc1 remaining in the capacitor C1 is consumed in the resistor element 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. At the turn-on time of the first switching element S1, since the voltage Vc1 across the capacitor C1 is 0V, 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 using the current detector A, the short circuit current Isc is detected.

Thereafter, due to the current flowing through the capacitor C1, charges are accumulated in the capacitor C1, and the voltage Vc1 across the capacitor C1 is increased. At this time, the potential difference between the supplied DC voltage and the voltage Vc1 at both ends of the capacitor C1 decreases, so that the current ic1 decreases. As a result, a constant voltage (the same voltage as the supplied DC voltage) is stored in the normal state. Will be. At this time, when the voltage Vc1 of both ends of the capacitor C1 is detected using the voltage detector B, the open voltage Voc by the constant voltage is detected.

This short-circuit current Isc and the open-circuit voltage Voc characteristic curve L may be illustrated as shown in FIG. 9. On the other hand, the point where the solar cell module generates the maximum power is called the optimum operating junction (mpp), the corresponding voltage is called the maximum output operating voltage (Vmpp), and the corresponding current is called the maximum output operating current (Impp). Can be.

On the other hand, the turn on / off timing of the first switching element Sl and the second switching element Sm is controlled by the control unit 310 in the characteristic measurement circuit 300. In addition, the controller 310 receives the current ic1 detected by the current detector A, and receives the voltage Vc1 of both ends of the capacitor C1 detected by the voltage detector B.

Meanwhile, an internal circuit diagram of the junction box 200 according to the embodiment of the present invention may be illustrated as shown in FIG. 6.

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

For example, when the junction box 200 includes the bypass diode unit 210, the capacitor unit 220, and the dc / dc converter unit 230 except the inverter unit 240, the junction box ( 200 may output a DC power supply. In this case, when the junction box 200 performs a power optimizing function, the junction box 200 may be referred to as a power optimizer.

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

The bypass diode unit 210 includes first to fourth nodes disposed between a nodes, b nodes, c nodes, and d nodes corresponding to the first to fourth conductive lines 135a, 135b, 135c, and 135d, respectively. Third bypass diodes Da, Db, and Dc are included.

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

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

In addition to the flyback converter shown in the drawing, the dc / dc converter 230 may include a boost converter, a buck converter, a forward converter, and a combination thereof (for example, For example, Cascaded Buck-Boost Converter.

The inverter unit 240 converts the level-converted DC power supply into AC power. In the figure, a full-bridge inverter is illustrated. That is, the upper arm switching elements Sa and Sb and the lower arm switching elements S'a and S'b, which are connected in series with each other, become a pair, and a total of two pairs of upper and lower arm switching elements are parallel to each other (Sa & S'a, Sb & S'b). Diodes are connected in anti-parallel to each of the switching elements Sa, S'a, Sb, and S'b.

The switching elements in the inverter unit 240 turn on / off based on an inverter switching control signal from an inverter controller (not shown). As a result, an AC power supply having a predetermined frequency is output. Preferably, it is preferable to have the same frequency (approximately 60 Hz) as the alternating frequency of the grid.

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

Meanwhile, in the embodiment of the present invention, since the junction box 200 including the dc / dc converter 230 is connected to the solar cell module 100, the output terminal (e node, f node) of the junction box 200 is connected. In the case where the input terminal (g node, h node) of the characteristic measurement circuit 300 is connected to FIG.

In order to prevent this, in the embodiment of the present invention, the switching elements 205 and the like are used to control the circuit elements in the junction box 200 to bypass.

The switching element 205 is disposed between the bypass diode unit 210 and the capacitor unit 220 so that the direct current power source passing through the bypass diode unit 210 flows to the capacitor unit 220, or to the outside. It may be controlled to flow to the exposed DC power terminal 207. To this end, the switching element 205 may be implemented as a relay element.

According to the operation of the switching element 205, the x node may conduct with the y node (in case of FIG. 7) or the x node may conduct with the z node (in case of FIG. 8).

For example, when the switching element, in particular, the button switch 205 is pressed, the x node conducts with the z node (corresponding to FIG. 8) to cut off the path of the dc / dc converter 230, and the DC power supply It is operable to be output to the DC power supply terminal 207.

As another example, when the button switch 205 is pressed once more, the x node conducts with the y node (corresponding to FIG. 7) so that the path may be readjusted so that the DC power is output to the dc / dc converter 230. have. In this case, DC power is not output to the DC power supply terminal 207.

8 shows the bypass output terminal of the junction box 200, that is, the DC power terminal 207 (z node) and the ground terminal 209 in the bypass mode, respectively, and the input terminal of the characteristic measurement circuit 300 (g node). , h node).

As a result, the DC power output from the solar cell module 100 may be simply connected to the characteristic measurement circuit 300. Accordingly, it is possible to accurately grasp the characteristics of the solar cell module 100.

On the other hand, even when the junction box 200 does not include the inverter 240 but only the dc / dc converter 230, the bypass output terminal of the junction box 200, that is, the DC power supply terminal, is in the bypass mode. (207) (z node) and ground terminal 209 can be connected to the input terminal (g node, h node) of the characteristic measurement circuit 300, respectively.

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

Referring to the drawings, the solar system of FIG. 10 includes a plurality of solar modules 50a, 50b, ..., 50n. Each solar module 50a, 50b, ..., 50n may be provided with junction boxes 200a, 200b, ..., 200n for outputting AC power. At this time, the junction boxes 200a, 200b, ..., 200n may be referred to as micro inverters, and AC power output from each junction box 200a, 200b, ..., 200n is supplied to the grid. Will be.

Meanwhile, according to an embodiment of the present invention, the connection method of the junction box 200 and the characteristic measurement circuit 300 of FIG. 8 may be applied to the micro inverter of FIG. 10.

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

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

On the other hand, according to an embodiment of the present invention, the connection method of the junction box 200 and the characteristic measurement circuit 300 of FIG. 8 may be applied to the power optimizer of FIG.

The solar module according to the present invention is not limited to the configuration and method of the embodiments described as described above, the embodiments are a combination of all or some of the embodiments selectively so that various modifications can be made It may be configured.

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 having a plurality of solar cells; And
And a junction box attached to one surface of the solar cell module and having a dc / dc converter configured to level convert and output the DC power supplied from the solar cell module.
The junction box,
A switching device to block a path from which the DC power is supplied to the dc / dc converter; And
And a DC power terminal exposed to the outside of the junction box and outputting the DC power when the path is blocked. The method of claim 1,
And a ground terminal exposed to the outside of the junction box. The method of claim 1,
The switching device includes:
The solar module is exposed to the outside of the junction box, comprising a button switch or a rotary switch for changing the path. The method of claim 1,
The junction box,
Detachable, the solar module further comprises a; waterproof cap covering the DC power terminal. The method of claim 1,
The DC power terminal is attached to the lower portion of the junction box, the solar module, characterized in that exposed to the ground direction. The method of claim 1,
The solar cell module,
A bus ribbon connected to a string of solar cells formed by connecting a portion of the plurality of solar cells in a row; And
And a conductive line electrically connecting the bus ribbon and the junction box. The method of claim 6,
The junction box,
The solar module of claim 2, wherein one end of the solar cell module is disposed closer to the end of the conductive line. The method of claim 1,
The junction box,
And a bypass diode configured to bypass some of the plurality of solar cells. 9. The method of claim 8,
The switching device includes:
The solar module, characterized in that for blocking the path between the bypass diode and the dc / dc converter. The method of claim 1,
The junction box,
And a capacitor unit for storing the DC power supplied from the solar cell module. The method of claim 1,
The junction box,
And an inverter unit converting the level-converted DC power into AC power and outputting the converted AC power. A solar cell module having a plurality of solar cells; And
And a junction box attached to one surface of the solar cell module and having a dc / dc converter configured to level convert and output the DC power supplied from the solar cell module.
The junction box,
A DC power terminal exposed to the outside of the junction box and outputting the DC power when the path to which the DC power is supplied to the dc / dc converter is cut off; And
And a ground terminal exposed to the outside of the junction box.

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