KR20120132097A - Photovoltaic module - Google Patents

Abstract

PURPOSE: A photovoltaic module is provided to easily supply AC power by including an inverter which converts DC power into AC power in a junction box. CONSTITUTION: A solar cell module(50) includes a plurality of solar cells(150), a front substrate(110), and a rear substrate(120). A plurality of ribbons(143) electrically connect the plurality of solar cells. A solar cell string(140) is electrically connected to a bus ribbon(145). An inverter converts DC power from the solar cell module to AC power. A screen(200) generates an electric field by receiving AC.

Description

Solar Modules {Photovoltaic module}

The present invention relates to a photovoltaic module, and more particularly, to a photovoltaic module capable of automatically removing foreign substances such as dust and snow and ice on the front surface of the photovoltaic module.

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.

Generally, several solar cells are connected in series or in parallel for solar power generation.In the case of foreign matter such as dust or snow accumulated on the light receiving surface of the photovoltaic module to which the solar light is incident, the reduction of sunlight is absorbed in series or parallel. Of the several solar cells connected, the output of a particular solar cell is reduced.

As such, when the output of a specific solar cell is reduced and several solar cells are connected in series, the total current is adjusted toward the lower current, and when connected in parallel under the same conditions, the total voltage is adjusted toward the lower voltage, thereby improving the efficiency of the solar module. Can be degraded. In addition, the low output solar cell may act as a hot spot, and there is a risk of heat generation and destruction as time passes.

An object of the present invention is to provide a solar module that generates an electric field to automatically remove foreign substances such as dust on the front of the solar module, and generates heat to automatically remove snow and ice on the front of the solar module. have.

The 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, the inverter unit for converting and outputting the DC power supplied from the solar cell module to AC power and AC power The screen may include a screen for generating an electric field, and the screen may include at least two electrode patterns to which AC power is applied and spaced from each other, and a switch unit for connecting and disconnecting at least two electrode patterns.

In addition, it includes a junction box located on the rear of the solar cell module, the interlock unit may be located in the junction box.

In addition, at least two electrode patterns may include a first electrode pattern and a second electrode pattern, and the first electrode pattern may include a first connection part connecting one end of the first plurality of electrode lines and the first plurality of electrode lines parallel to each other. The second electrode pattern includes a second connecting portion connecting one end of the second plurality of electrode lines and the second plurality of electrode lines that are arranged to be parallel to each other and parallel to the first plurality of electrode lines, and wherein the switch unit includes the second plurality of switch portions. A plurality of first switches for connecting and disconnecting the other end and the first connection of the electrode line of the plurality of switches and a second switch for connecting and blocking the other end and the second connection of the first plurality of electrode lines.

According to the exemplary embodiment of the present invention, the foreign matter such as dust and snow on the front surface of the solar module can be automatically removed to prevent the efficiency of the solar module from being lowered and the occurrence of hot spots can be minimized.

In addition, by providing an inverter unit converting DC power into AC power and outputting the same in the junction box, it is possible to easily perform AC power supply through the junction box.

1 is an exploded perspective view of a solar module according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line AA ′ of the screen of the solar module of FIG. 1.
3 is a diagram illustrating an example of an internal circuit diagram of a junction box of the solar module of FIG. 1.
4 is a diagram illustrating an example of an internal circuit diagram of a junction box of the solar module of FIG. 1.
5 to 9 illustrate screens included in the solar module of the present invention.

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

In the drawings, each component is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. In addition, the size of each component does not entirely reflect the actual size, and the same identification code will be used for the same component.

In addition, suffixes "module" and " part "for the 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 an exploded perspective view of a solar module according to an embodiment of the present invention, Figure 2 is a cross-sectional view taken along the line AA 'of the screen of the solar module of Figure 1;

1, the solar module 100 according to an embodiment of the present invention is a solar cell module 50 having a plurality of solar cells 150, the DC power supplied from the solar cell module 50 It may include an inverter unit (not shown) for converting and outputting AC power and a screen 200 for generating an electric field by receiving AC power.

First, the solar cell module 50 includes a plurality of solar cells 150, a first sealing film 131, a second sealing film 132, and a solar cell 150 that seal the plurality of solar cells 150 from both sides. It may include a front substrate 110 to protect the light receiving surface of the rear substrate 120 to protect the back surface of the solar cell 150, a plurality of ribbons 143 for electrically connecting the plurality of solar cells 150 ) And a bus ribbon 145 connecting the plurality of ribbons 143 to each other.

The solar cell 150 is a semiconductor device that converts solar energy into electrical energy, and may be formed as 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 150 includes a first conductive silicon substrate, a second conductive semiconductor layer formed on the silicon substrate and having a conductivity type opposite to that of 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 be, but is not limited to, a silicon solar cell that may include a back electrode formed on a back surface of the silicon substrate, and the solar cell 150 may include a compound semiconductor solar cell and a compound semiconductor solar cell. Tandem solar cells, and the like.

 The plurality of solar cells 150 may be electrically connected in series, in parallel or in parallel by the ribbon 143. Specifically, the ribbon 143 may connect the front electrode formed on the light receiving surface of the solar cell 150 and the rear electrode formed on the back surface of another adjacent solar cell 150 by a tabbing process. The tabbing process may be performed by applying flux to one surface of the solar cell 150, placing the ribbon 143 on the flux-applied solar cell 150, and then firing the same.

As described above, the plurality of solar cells 150 electrically connected by the ribbon 143 form a string 140, and the solar cell strings 140 may be adjacent to each other to form several rows.

In the drawing, the ribbon 143 is formed in two lines, and by the ribbon 143, a plurality of solar cells 150 are connected in a row to form six strings, and each string has ten solar cells 150. Illustrates having a, but is not limited thereto, and various modifications are possible.

Meanwhile, each of the solar cell strings 140 may be electrically connected by the bus ribbon 145. In detail, the bus ribbon 145 may be disposed transversely at both ends of the solar cell string 140 disposed in a plurality of rows, and may alternately connect both ends of the ribbon 143 of the solar cell string 140. In addition, although not shown in the drawings, the bus ribbon 145 is connected to the junction box 170 disposed on the rear surface of the solar cell module 50.

As described above, the solar cell string 140 forming several rows may be positioned between the first sealing film 131 and the second sealing film 132.

The first sealing film 131 may be located on the light receiving surface of the solar cell 150, the second sealing film 132 may be located on the back surface of the solar cell 150, and the first sealing film 131 and the second The sealing film 132 is bonded by lamination to block moisture, oxygen, and the like, which may adversely affect the solar cell 150.

In addition, the first sealing film 131 and the second sealing film 132 allow each element of the solar cell 150 to be chemically bonded. The first sealing film 131 and the second sealing film 132 are made of ethylene vinyl acetate copolymer resin (EVA), polyvinyl butyral, ethylene vinyl acetate partial oxide, silicon resin, ester resin, olefin resin, and the like. Can be used.

The front substrate 110 is positioned on the first sealing film 131, and is preferably formed of tempered glass in order to protect the solar cell 150 from external impact and the like and to transmit sunlight. 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 rear substrate 120 is a layer for protecting the solar cell on the back surface of the solar cell 150, and functions as a waterproof, insulation, and UV blocking, but may be a TPT (Tedlar / PET / Tedlar) type, but is not limited thereto. . In addition, the rear substrate 120 is preferably made of a material having excellent reflectivity so that it can be reused by reflecting the sunlight incident from the front substrate 110 side, the double-sided solar cell is formed of a transparent material that can enter the sunlight You can also implement modules.

The solar cell module 50 generates a DC power, and the inverter unit (not shown) converts the DC power supplied from the solar cell module 50 into AC power and outputs the AC power. For example, the inverter unit (not shown) may be located in the junction box 170 to be described later, but is not limited thereto. For example, the micro inverter may be mounted on the solar cell module 50.

Referring to FIG. 1, the junction box 170 may be located on the rear substrate 120 of the solar cell module 50, and the capacitor unit and the electrical unit may be used to charge and discharge electrical energy produced from the solar cell 150. It may include a circuit element such as a diode to prevent the reverse flow. In order to protect the circuit device, the inside of the junction box 170 may be coated with a moisture barrier.

In addition, the junction box 170 generates high heat from a diode or the like during operation, and the generated heat may reduce the efficiency of a specific solar cell 150 arranged at a position where the junction box 170 is attached. It may further include a heat dissipation member (not shown) disposed between the battery module 50 and the junction box 170.

At this time, in order to disperse heat generated in the junction box 170, the area of the heat dissipation member (not shown) is preferably larger than the area of the junction box 170. For example, it may be formed on all of the rear surface of the solar cell module 50. In addition, the heat dissipation member (not shown) is preferably formed of a metal material such as gold (Au), silver (Ag), copper (Cu), aluminum (Al), tungsten (W) having good thermal conductivity.

Meanwhile, the junction box 170 may include an inverter unit (not shown) for converting and outputting DC power supplied from the solar cell module 50 to AC power as described below with reference to FIGS. 3 and 4. AC power output from the inverter unit (not shown) is supplied to the screen 200, whereby the screen may generate an electric field.

FIG. 2 is a cross-sectional view illustrating an AA ′ cross section of the screen 200 of the solar module 100 of FIG. 1. Referring to FIG. 2A, the screen 200 includes an electrode pattern to which an AC power is applied ( 220). For example, the electrode pattern 220 may be located in the base film 210.

The base film 210 is lighted so as not to interfere with insulation between the electrode patterns 220 and to absorb light to the solar cell 150 when the screen 200 is positioned on the front substrate 110 of the solar cell module 50. It may be formed of a polymer material having excellent permeability, such as polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polystyrene, polyepoxy, and the like.

Electrode pattern 220 is also a material having a light-transmissive property, such as ITO, when the screen 200 is located on the front substrate 110 of the solar cell module 50, so as not to interfere with light absorption to the solar cell 150, It may be formed of IZO (In-ZnO), GZO (Ga-ZnO), AZO (Al-ZnO), AGZO (Al-Ga ZnO), IGZO (In-Ga ZnO), IrOx, RuOx and the like.

On the other hand, the AC power output from the inverter unit (not shown) is supplied to the electrode pattern 220, the electrode pattern 220 is at least two electrode patterns 222 spaced apart from each other, as described later in Figures 5 to 9 , 224).

The at least two electrode patterns 222 and 224 spaced apart from each other may be alternately positioned. When the AC power is applied, the at least two electrode patterns 222 and 224 are open, and thus no current flows, and are charged with opposite polarities.

Therefore, when AC power is applied to at least two electrode patterns 222 and 224 spaced apart from each other, an electric field as shown in FIG.

On the other hand, since the applied AC power has a constant frequency, at least two electrode patterns 222 and 224 spaced apart from each other are periodically changed in polarity due to charging.

Referring to (b) of FIG. 2, a process in which foreign substances P such as dust are removed by an electric field is described first. First, foreign matters P such as dust charged with an anode or a cathode are charged by an electric field. Moving force in the direction and flotation force in the y direction. Here, the x direction does not mean a specific direction on the screen 200, but means any direction parallel to the surface of the screen 200.

That is, the foreign matter P, such as dust charged with the positive electrode or the negative electrode, floats on the surface of the screen 200 by the flotation force by the electric field, and at the same time occurs between at least two electrode patterns 222 and 224 spaced from each other. It is moved along the surface of the screen 200 by the periodic change of the electric field.

At this time, the moving force in the x-direction should be greater than the adhesion of foreign matter (P), such as dust, the floatation force in the y-direction has to have a force greater than the gravity and adhesion force to remove the foreign matter (P) such as dust from the surface of the screen 200. The movement force and the flotation force may be proportional to the size of the AC power applied to the electrode pattern 220, thereby controlling the size of the applied AC power to remove the foreign matter P having a large size.

In addition, the foreign matter (P) such as dust is removed faster the larger the frequency of the AC power applied to the electrode pattern 220, the faster the gap between the at least two electrode patterns 222, 224 spaced apart from each other. Can be.

On the other hand, foreign matter (P) such as dust that is not charged may also be removed on the screen 200 by the frictional charging effect. That is, the foreign matter (P) such as dust that is not charged is first settled on the surface of the screen 200, and after contact with the surface of the screen 200 will have a charge due to the frictional charging effect, the above-mentioned buoyancy and The moving force acts on the charged foreign matter P, and as a result can be removed on the screen 200.

Therefore, according to the present invention, it is possible to automatically remove foreign substances P such as dust attached to the light receiving surface of the solar module 100.

Meanwhile, as shown in FIGS. 5 to 9, the screen 200 may include a switch unit (not shown) that may connect at least two electrode patterns 222 and 224 spaced apart from each other. When c) is turned on, at least two electrode patterns 222 and 224 spaced apart from each other are in a disconnected state, and current flows. This current flow generates heat, and snow and ice on the front surface of the solar module 100 may be removed by the generated heat.

Therefore, the photovoltaic module 100 according to the present invention can automatically remove foreign substances such as dust and snow on the front surface of the photovoltaic module 100 and prevent the efficiency of the photovoltaic module 100 from being lowered. The occurrence of hot spots can be minimized. In addition, it is possible to increase the period of the periodic cleaning for the removal of foreign matter, it is possible to reduce the time and maintenance and management costs put into it.

On the other hand, the screen 200 may be attached to the front substrate 110 of the solar cell module 50 by a transparent adhesive layer (not shown). The transparent adhesive layer (not shown) may be in the form of a film or may be formed by applying an adhesive formed of a material having fluidity and adhesiveness, that is, acrylic or epoxy. The adhesive layer (not shown) attaches the screen 200 to the front substrate 110 and seals the electrode pattern 220 to protect the electrode pattern 220 from foreign matter such as moisture and dust. .

Meanwhile, in FIG. 1, the screen 200 is located on the front substrate 110 of the solar cell module 50, but is not limited thereto. The screen 200 may be located in the rear substrate 120. For example, the rear substrate 120 may be formed of a multilayer structure such as TPT (Tedlar / PET / Tedlar), and the screen 200 may be located inside the rear substrate 120 having a multilayer structure for insulation and the like. have.

As such, when the screen 200 is positioned between the multilayer structure of the rear substrate 120, the electrode pattern 220 and the base film 210 may have light transmissivity because they do not interfere with light absorption into the solar cell 150. no need. That is, the electrode pattern 220 may be made of an opaque metal material.

In addition, only the electrode pattern 220 except for the base film 210 may be formed between the multilayer structure of the rear substrate 120. In this case, the formed electrode pattern 220 may be covered with an insulating film to prevent electrical discharge and spark that may occur between the electrode patterns 220.

On the other hand, the solar module 100 according to an embodiment of the present invention is the operation of the charging and discharging unit (not shown) for charging and discharging the DC power produced by the solar cell module 50, AC power to the screen 200 It may include a control unit (not shown) for controlling the timing of supply, the operation of the switch unit (not shown).

The charging and discharging unit (not shown) charges the DC power produced by the solar cell module 50, and the charged charging power is a capacitor unit 172, an inverter unit 174, or a converter unit (to be described later with reference to FIGS. 3 and 4). 176). As the charge / discharge unit (not shown), a secondary battery or an electric double layer capacitor may be used.

The controller (not shown) supplies AC power to the screen 200 at a preset time, so that the foreign matter such as dust may be periodically removed, and the inverter unit 174, a charge / discharge unit (not shown), etc., which will be described later with reference to FIG. 3. Can be controlled. For example, in order to supply AC power to the screen 200 at night time without sunlight, the DC power is stored by controlling the charge / discharge unit (not shown) during the day time, and then charge / discharge unit (not shown) at the night time. It can be performed by controlling the discharge of and the operation of the inverter unit 174 to be described later in FIG.

In addition, the controller (not shown) senses the temperature of the surface of the solar module 100, controls the operation of the switch unit (not shown) of the screen 200, thereby generating heat to generate the solar module 100 You can remove snow or ice from the front.

3 is an example of an internal circuit diagram of a junction box of the solar module of FIG. 1.

Referring to FIG. 3, the junction box 170 according to an embodiment of the present invention may include a capacitor unit 172 and an inverter unit 174. Therefore, the junction box 170 may output AC power.

The capacitor unit 172 stores the DC power supplied from the solar cell module 50. 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.

In addition, the capacitor unit 172 is preferably attached to the junction box 170 to be detachable. For example, it is possible for each capacitor Ca, Cb, Cc to be arranged side by side in a frame as a stack structure. The capacitor unit 172 is a module and may be attached to or detached from the groove in the junction box 170. According to this structure, when the replacement according to the life of the capacitor unit 172, or when replacing by a failure, it is possible to facilitate the replacement operation.

The inverter unit 174 converts DC power 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 174 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.

In this way, the junction box 170 includes a capacitor unit 172 for storing DC power and an inverter unit 174 for converting and storing the stored DC power into AC power, thereby providing a simple operation through the junction box 170. AC power can be supplied to the screen 200 of FIG.

4 is an example of an internal circuit diagram of a junction box of the solar module of FIG. 1.

Referring to FIG. 4, the junction box 170 according to an exemplary embodiment of the present invention may include a capacitor unit 172, a dc / dc converter unit 176, and an inverter unit 174. Since the capacitor unit 172 and the inverter unit 174 are the same as those shown and described with reference to FIG. 3, detailed descriptions thereof will be omitted.

The dc / dc converter 176 performs level conversion by using the DC power stored in the capacitor 172. 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.

The dc / dc converter 172 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.

The DC power level converted as described above is converted into AC power by the inverter unit 174 and may be supplied to the screen 200 of FIG. 1. Therefore, the screen 200 can be supplied with an AC power having a large power, thereby making it possible to remove foreign matter of a large size.

Meanwhile, a capacitor unit (not shown) may be further included between the dc / dc converter unit 176 and the inverter unit 174 to store the level-converted DC power. The capacitor unit (not shown) may include a plurality of capacitors, similar to the capacitor unit 172 described above.

5 to 9 illustrate screens included in the solar module of the present invention.

First, referring to FIG. 5, the screen 300 may include an electrode pattern 320, and the electrode pattern 320 may include a first electrode pattern 322 and a second electrode pattern 324 spaced apart from each other. can do. In addition, the screen 300 may include a switch unit 340 connecting and blocking the first electrode pattern 322 and the second electrode pattern 324.

The first electrode pattern 322 and the second electrode pattern 324 spaced apart from each other are formed side by side so as not to cross each other, and may be formed to have a spiral so as to be alternately positioned. In addition, in order to maximize the electric field generated in the surface of the screen 400, as shown in the figure it may be formed to have the same basic shape as the base film 410 of the spiral structure.

On the other hand, when AC power is applied to the first electrode pattern 322 and the second electrode pattern 324, no current flows, and the first electrode pattern 322 and the second electrode pattern 324 have different polarities. It is charged. Therefore, the direction of the electric field generated between the first electrode pattern 322 and the second electrode pattern 324 is periodically changed, thereby removing foreign matter on the solar module.

In this case, as the distance between the first electrode pattern 322 and the second electrode pattern 324 adjacent to each other decreases, the removal speed of the foreign matter increases, but the distance between the first electrode pattern 322 and the second electrode pattern 324 increases. If too close, electrical discharges and sparks may occur between neighboring electrode patterns 264.

Therefore, it is preferable that the electrode pattern 320 has a shape surrounded by the base film 310 by forming a groove in the insulating base film 310 and embedding the electrode pattern 320 therein. .

On the other hand, the switch unit 340 connects and blocks the first electrode pattern 322 and the second electrode pattern 324 by the control of the control unit (control unit), for example, the control unit (not shown) is the By sensing the temperature, the operation of the switch unit 340 may be controlled accordingly.

If the switch unit 340 is in the ON state, the first electrode pattern 322 and the second electrode pattern 324 are short-circuited and a current flows. The current flowing through the first electrode pattern 322 and the second electrode pattern 324 generates heat due to resistance, and the generated heat can be removed by melting snow or ice accumulated on the front surface of the solar module. do.

Meanwhile, the first electrode pattern 322 and the second electrode pattern 324 are connected to the cable 380 so that AC power can be applied. At least one pair of cables 380 is connected to the first electrode pattern 322 and the second electrode pattern 324, and the other end is connected to the inverter unit (not shown) to supply AC power to the electrode pattern 320. To pass.

One end of the cable 380 may extend to the inside of the base film 310 to be soldered with the electrode pattern 320 or may be crimped while being inserted into the base film 310 to be electrically connected to the electrode pattern 320. .

In addition, (b) of FIG. 5 is a road in which part c of FIG. 5 (a) is enlarged, and as shown in FIG. 5 (b), a fastening groove 327 is formed at one end of the electrode pattern 320. One end of the cable 380 is formed with a connection terminal 382 that can be coupled with the fastening groove 327, and the cable 380 and the electrode pattern are coupled by the fastening groove 327 and the connection terminal 382. 320 can be easily connected.

In addition, the other end of the cable 380 connected to the inverter unit (not shown) may have the same configuration. Therefore, when an error occurs in the cable 380, the junction box (170 of FIG. 1) or the screen 300, it can be easily replaced. In addition, a groove may be formed in the cable 380, and a protrusion that may be coupled to the groove may be formed in the electrode pattern 320.

On the other hand, portions except for the connection terminal 382 of the cable 380 may be exposed to the outside, it is preferable that the structure is stacked or coated with an insulating layer 384.

The cable 380 and the base film 310 described above may be equally applied to FIGS. 6 to 9.

Referring to FIG. 6, the screen 400 may include an electrode pattern 420 formed in the base film 410 and connected to one end of a cable 480 for supplying AC power. In addition, the electrode pattern 420 may include a first electrode pattern 422, a second electrode pattern 424, and a third electrode pattern 426 formed in a spiral shape so as to be spaced apart from each other and formed side by side. The switch 440 is positioned at the other ends of the second and second electrode patterns 422 and 424 and 426 so that the first electrode pattern 422, the second electrode pattern 424, and the third electrode pattern 422 are positioned. Adjust connection and blocking of (426).

In this case, the AC power applied to the first electrode pattern 422, the second electrode pattern 424, and the third electrode pattern 426 may be a three-phase AC power source having a phase difference of 120 ° from each other. have. Therefore, power consumption consumed can be reduced. In addition, the first electrode pattern 422, the second electrode pattern 424, and the third electrode pattern 426, which are shorted by the switch unit 440, may be connected by a Y-wire.

The screen 500 illustrated in FIG. 7 includes an electrode pattern 520 including a first electrode pattern 522 and a second electrode pattern 524 in the base film 510.

The first electrode pattern 522 and the second electrode pattern 524 may be formed to be parallel to each other, and may include a continuous 'z-shape' bent to maximize the formation of the electric field. When the first electrode pattern 522 and the second electrode pattern 524 are formed to include a continuous 'z-shape' bending in the vertical direction, the first electrode pattern 522 and the second electrode pattern 524 are connected. And since the switch unit 540 for blocking can be formed in the corner portion of the base film 510, the manufacturing of the screen 500 can be easy. In addition, when the screen 500 is located in front of the solar module, it may not interfere with the progress of the incident sunlight.

Referring to FIG. 8, the screen 600 may include a first electrode pattern 620 and a second electrode pattern 630.

The first electrode pattern 620 includes a first plurality of electrode lines 622 parallel to each other and a first connection part 623 connecting one end of the first plurality of electrode lines 622 to each other, and the second electrode pattern 630. ) May include a second plurality of electrode lines 632 crossing the first plurality of electrode lines 622 and parallel to each other, and connecting one end of the second plurality of electrode lines 632 to each other. Can be.

In addition, the screen 600 includes a plurality of first switches 642 and other plurality of first electrode lines 622 connecting and disconnecting the other ends of the second plurality of electrode lines 632 and the first connection portion 623. It may include a plurality of second switches 644 for connecting and disconnecting the stage and the second connection portion 633.

The plurality of first switches 642 and the plurality of second switches 644 may be controlled by a controller (not shown). That is, when the plurality of first switches 642 and the plurality of second switches 644 are in an OFF state, an electric field is generated between the first electrode pattern 620 and the second electrode pattern 630, thereby providing a solar module. Foreign matter on the front surface or the screen 600 may be removed, and when the plurality of first switches 642 and the plurality of second switches 644 are turned on, snow or ice may be removed by the generation of heat caused by the flow of current. Can be.

In addition, the controller may control the plurality of first switches 642 and the plurality of second switches 644 to operate independently.

The screen 700 of FIG. 9 may include a first electrode pattern 720 and a second electrode pattern 730 similar to the screen 600 of FIG. 8. However, one end of the first plurality of electrode lines 722 parallel to each other is connected by the first pad 723, and one end of the second plurality of electrode lines 732 is connected by the second pad 733.

At least one of the first pad 723 and the second pad 733 may be wider than the width of the first plurality of electrode lines 722 and the second plurality of electrode lines 732. Therefore, the connection with the cable 780 for supplying AC power may be easy. In particular, the wide first pad 723 and the second pad 733 may be more easily formed in the insertion groove shown in FIG.

Meanwhile, the plurality of first switches 742 and the plurality of second switches 744 may operate under the control of the controller, and in particular, may operate independently.

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 (17)

A solar cell module having a plurality of solar cells;
An inverter unit for converting and outputting DC power supplied from the solar cell module into AC power; And
And a screen for generating an electric field by receiving the AC power.
The screen may include at least two electrode patterns to which the AC power is applied and spaced apart from each other, and a switch unit connecting and blocking the at least two electrode patterns. The method of claim 1,
Wherein said screen comprises a base film and said at least two electrode patterns are located within said base film. The method of claim 2,
The screen is located in front of the solar cell module,
The at least two electrode patterns are formed of a light transmitting material solar module. The method of claim 1,
The solar cell module includes a front substrate positioned on an upper surface of the plurality of solar cells and a rear substrate positioned on a rear surface of the plurality of solar cells.
The rear substrate has a multilayer structure, and the at least two electrode patterns are located inside the rear substrate having the multilayer structure. 5. The method of claim 4,
The at least two electrode patterns are solar modules formed of an opaque material. The method of claim 1,
It includes a junction box located at the rear of the solar cell module,
The solar module is located in the junction box. The method according to claim 6,
The junction box includes a capacitor unit for storing the DC power and a converter unit for level conversion of the stored DC power. The method of claim 1,
The at least two electrode patterns are three electrode patterns spaced apart from each other, and the AC power is a three-phase AC power supplied to the three electrode patterns. 9. The method of claim 8,
The switch unit is a solar module for connecting the three electrode patterns in a Y-wire. The method of claim 1,
The solar module further comprises a charge and discharge unit for charging and discharging the DC power. The method of claim 1,
And a control unit controlling the supply timing of the AC power to the screen and the operation of the switch unit. The method of claim 2,
It includes a cable connecting the inverter unit and the electrode pattern,
One end of the cable extends into the base film to connect with the electrode pattern. The method of claim 12,
A fastening groove is formed in the electrode pattern, and one end of the cable includes a connection terminal coupled to the fastening groove. The method of claim 1,
The at least two electrode patterns include a first electrode pattern and a second electrode pattern,
The first electrode pattern may include a first plurality of electrode lines parallel to each other and a first connection part connecting one end of the first plurality of electrode lines, and the second electrode pattern may be arranged to cross the first plurality of electrode lines. And a second connection part connecting one end of the second plurality of electrode lines and the second plurality of electrode lines to be parallel to each other,
The switch unit may include a plurality of first switches connecting and disconnecting the other ends of the second plurality of electrode lines and the first connection unit, and a plurality of first switches connecting and blocking the other ends of the first plurality of electrode lines and the second connection unit. Solar module comprising 2 switches. 15. The method of claim 14,
At least one of the first connector and the second connector is formed of a pad wider than the width of the first plurality of electrode lines and the second plurality of electrode lines. 15. The method of claim 14,
And a controller configured to control operations of the plurality of first switches and the plurality of second switches, wherein the plurality of first switches and the plurality of second switches operate independently under control of the controller. module. The method of claim 3,
A solar module comprising an adhesive layer between the screen and the solar cell module.

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