JPH10319851A - Display panel by color solar batteries - Google Patents

Abstract

PROBLEM TO BE SOLVED: To scure safety by preventing it that a firing accident is generated by the generation of a hot spot heat at the time of displaying characters or pictures on a display panel with different colors by connecting color solar battery cells in series. SOLUTION: Relating to a display panel 1A in which numerous color solar battery cells or color modules (cells or modules) 2a, 2b are provided on a building or the like so as to become in a grid shape or the like and characters or graphics are displayed with their surface colors, a series circuit 4 is formed by only cells or modules 2a, 2b whose short-circuited current is approximate. Thus, even when they receive solar ray and a current is made to flow the series circuit 4, since color solar battery cells whose cuurent characteristics are low are not used in the circuit, a danger that the firing accident is generated by the generation of the hot spot heat is dissolved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a structure in which a large number of various color solar cells or color solar cell modules having different surface colors are arranged on a wall of a building, and characters, figures, pictures, and the like can be displayed. The present invention relates to a display panel in a photovoltaic power generation system, and particularly to a connection configuration of the color solar cell or the solar cell module.

[0002]

2. Description of the Related Art As is well known, a combination of a large number of color tiles, an appropriate selection of a light emitting plate having a surface color, etc., are arranged, and characters, figures, pictures, and the like are expressed by neon signs. However, color solar cells with various surface colors have been produced by selecting anti-reflection films and changing the thickness of the solar cells, and therefore, naturally, However, characters and the like can be displayed also by disposing the color solar cells and the color solar cell modules. However, when manufacturing a display panel using such color solar cells, color solar cells or solar cell modules having various surface colors are randomly used, connected in series, and a plurality of the series circuits are connected. When adopting the conventional connection means of connecting only in parallel, attention must be paid to the point that the following problems may occur.

[0003] That is, if various surface colors are obtained as a color solar cell by changing the anti-reflection film of the conventional solar cell or the like, the reflectance to sunlight or the like naturally changes. , The voltage-current characteristics at the time of power generation will change. More specifically, in the power characteristics described above, the voltage characteristics are substantially unaffected by the change in the surface color and become substantially constant, but the current characteristics show a considerable difference due to the difference in the surface color. It is.

Accordingly, as shown in FIG.
-Solar cell a1 , A2 , A3 , A4 series circuit
When connected to the load b, the color solar cell a3
But other color solar cells a1 , A2 , A4 short
If the current is lower than the short-circuit current value,
When the current flows, the color solar cell a3 Only electricity
Acting as a dynamic load, causing unusually large heat generation (hot spots).
Heat).

[0005]

SUMMARY OF THE INVENTION Based on the above points, the present invention is based on the above-mentioned aspect, and in the case of claim 1, the short-circuit current of a color solar cell or a color solar cell module having various surface colors is previously determined. When forming a series circuit, connect only the short-circuit current value as close as possible, thereby heating a specific color solar cell or color solar cell module,
This aims to prevent an unexpected accident from occurring.

According to a second aspect of the invention, instead of forming only one series circuit as in the first aspect, a series circuit for each group of the same plurality is formed by approximation of the short-circuit current value. By connecting the series circuit in parallel, the above object according to claim 1 is achieved,
Using color photovoltaic cells or color photovoltaic modules with various surface colors, it is possible to provide a wider variety of paintings and advertisements, and to provide all the power generated by light reception to one load. .

[0007]

According to the present invention, in order to attain the above object, according to the present invention, a large number of color solar cells or color solar cells modules are provided, and the color solar cells or color solar cells are provided. In a display panel configured to display characters, figures, and the like by using different surface colors of the battery module, the color solar cells or the color solar cell modules having the different surface colors have similar current characteristics. To provide a display panel using a color solar cell, in which a series circuit is formed.

According to the present invention, a plurality of color photovoltaic cells or color photovoltaic modules are provided, and characters, graphics, etc. are displayed by different surface colors of the color photovoltaic cells or color photovoltaic modules. In such a display panel, the color solar cells or the color solar cell modules having the different surface colors are grouped into a plurality of identical sheets each having an approximate current characteristic, and a plurality of groups are formed for each of these groups. It is an object of the present invention to provide a display panel using color solar cells, wherein separate series circuits are formed and the series circuits of each group are connected in parallel.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In claim 1 of the present application, a display panel 1A shown in FIG. 1A has a large number of color solar cells or color solar cell modules 2.
(Hereinafter referred to as a cell or a module) are arranged side by side in a grid on the gantry 3 or on the wall surface of the building, and in FIG. A color solar cell having two kinds of surface colors, that is, a cell or a module 2b in a white display is used.

Here, as can be understood from the actual wiring diagram of FIG. 1A and the electric circuit explanatory diagram of FIG. 1B, the cell or module 2a indicated by the oblique lines is made of polycrystalline silicon. The surface color is light blue, and polycrystalline silicon is used as a material for the cell or module 2b of the white display, and the surface color is blue. Therefore, the display panel 1
In A, the character D is displayed by the light blue of the cell or module 2a with the cell or module 2b being blue as the ground color.

The two types of cells or modules 2a and 2b are connected in series as clearly shown in FIG. 1B to form a series circuit 4, having a positive terminal 4a and a negative terminal 4b. However, in the present invention, the short-circuit current Isc as the average data of the cell or module 2a, 2b is 2.82, respectively.
(A) and 2.98 (A), all of which have similar current characteristics. In addition, Isc, which is average data when the material is polycrystalline silicon and the surface color is brown gold, is also 2.91 (A). It is also possible to connect.

As described above, when the above-described DC circuit 4 is used, the cells or modules 2a and 2b connected thereto are:
Since both have similar current characteristics,
Even if a current during power generation flows through the DC circuit 4, there is no cell or module with particularly low current characteristics.
Since cells or modules having low current characteristics are not mixed in the series circuit 4, no hot spot heat is generated, and a safe display panel 1A can be provided.

FIG. 2 also shows another embodiment according to the first aspect of the present invention.
As shown in FIG. 2, not only the letter D but also three letters D, H, and I are displayed.
In the display panel 1B, not only a larger number of color solar cells or color solar cell modules are provided on the gantry 3 but also two series circuits 4A and 4B are formed. In the series circuits 4A and 4B, loads are respectively connected between the positive terminal 4a and the negative terminal 4b and between the positive terminal 4c and the negative terminal 4d.

That is, in the above-mentioned series circuit 4A, cells or modules 2a indicated by regular oblique lines and cells or modules 2b indicated by white lines are adopted as in the case of FIG. Module 2
b are connected in series more than in FIG. On the other hand, in the series circuit 4B, a cell or module 2c indicated by a negative diagonal line and a cell or module 2d indicated by a cross line are newly connected in series. In this case, the former cell or module 2c is connected. Is polycrystalline silicon, and its surface color is gray. On the other hand, the latter cell or module 2d is also made of polycrystalline silicon, but gold is adopted as the surface color. In this case, the total number of cells or modules 2a and 2b in one series circuit 4 is 29 while the other series circuit 4B
Is 1 or the total number of cells or modules 2c and 2d is 1
It has decreased to six.

Therefore, the light blue cell or module 2a and the blue cell or module 2b in the above-described series circuit 4A have substantially similar short-circuit currents. However, the character D can be displayed.
On the other hand, in the other series circuit 4B, the material of the cell or module 2c indicated by the negative oblique line is polycrystalline silicon, the surface color thereof is gray, and the short-circuit current Isc as average data of the solar cell is 2 .52 (A),
The cell or module 2d of the cross line display is also made of polycrystalline silicon, and the surface color is gold.
Is 2.48 (A).

That is, cells or modules 2c, 2c
d has very similar current characteristics. Therefore, there is no concern that hot spot heat is generated. Therefore, blue is used as the ground color for cells or modules 2b in white display and gray for cells or modules 2c in negative oblique lines. , H are displayed, and the character I is displayed by gold in the cell of the intersection line display or the module 2d with the same blue as the ground color.

However, in the case of the configuration as shown in FIG. 2, the series circuit 4 disclosed in FIG. 1 is used separately from each other, so that the power generation by the cells or modules 2a and 2b is performed. The output is the positive terminal 4a
And a power output from the cell or module 2c, 2b is applied to a load between the positive terminal 4c and the negative terminal 4d. .

Next, a second aspect of the present invention will be described. The voltage characteristics of the cells or modules in each of the series circuits are matched with those of the first aspect of the present invention. Is configured to be able to supply the entire power generation output to one load. Therefore, according to the second aspect, as shown in FIG. 3, one of the cells or modules 2a, 2b, 2c, and 2d having different surface colors has an approximate current characteristic. The number of the serial circuits 5A and 5B in a plurality of columns is connected in parallel for each group.

Therefore, the display panel 1C shown in FIG.
Has a large number of color photovoltaic cells or color photovoltaic modules 2 mounted on a gantry 3 or the like as described above. In one series circuit 5A for each group, the cells or modules 2a, 2c, 2d are described. Are connected in series,
The total number (30) and the other group-based series circuits 5B
And the total number of cells or modules 2b connected in series is the same as the number of cells or modules 2b, so that the voltage characteristics of the series circuits 5A and 5B for each group can be matched.

The reason why the cells or modules 2a, 2c, and 2d are selected in the group-based series circuit 5A is that the cells or modules 2b having the largest short-circuit current Isc of 2.98 (A) are selected according to the groups. To be adopted in the series circuit 5B, and the remaining cells or modules 2a,
2.82, 2.52 for Isc of 2c and 2d, respectively.
The reason for this is to provide a safe display panel 1C by making the phase difference relatively small as in 2.48, and by doing so, avoiding the generation of hot spot heat as described above. In addition, according to the second aspect, even if a load is connected between the positive terminal 5a and the negative terminal 5b by connecting the series circuits 5A and 5B for each group in parallel, the voltage characteristic of each group is as described above. Since the alignment is performed as described above, there is no possibility that a failure occurs.

FIG. 4 shows a substantial wiring diagram of the display panel 1C shown in FIG. 3A, and as can be understood, the surface color is changed to blue by 40 cells or modules 2b. The ground color, which is a white display on the drawing, is displayed by the group-by-group series circuit 5A. The cell or module 2a in the group-by-group series circuit 5B uses the light blue surface color to indicate the letter D as a regular oblique line in the drawing, and the cell or module 2c to indicate the gray surface color as a negative oblique line in the drawing. The character "H" and the character "I" indicated by the cross line in the drawing are further displayed by the gold surface color of the cell or module 2d, and the power generation output based on all the cells or modules 2a, 2b, 2c and 2d is reduced. One load.

[0022]

According to the present invention, the cells or modules of the series circuit are all selected so as to have approximate current characteristics. Since there is no occurrence of fire, display panels made of color solar cells that are safe against accidents such as fires are formed on the walls of buildings, etc., thereby providing paintings and advertisement contents with high reliability. .

According to the second aspect, a plurality of series circuits for each group are connected in parallel, and for each cell or module of each series circuit for each group, a cell or module having an approximate current characteristic is selected. Since the modules are grouped as a plurality of identical modules, the generation of hot spot heat can be completely prevented. In addition, even if a plurality of series circuits for each group are used, there is no problem due to matching of voltage characteristics without causing a variety of problems. Thus, a complicated display can be realized.

[Brief description of the drawings]

FIG. 1 shows an example of a display panel using a color solar cell according to claim 1 of the present application, and FIG.
(B) is an explanatory view of the electric circuit.

FIG. 2 shows another example of the display panel according to claim 1;
(A) is a schematic front view thereof, and (B) is an electric circuit explanatory diagram.

3A and 3B show a display panel using a color solar cell according to claim 2 of the present application, wherein FIG. 3A is a schematic front view thereof, and FIG.

FIG. 4 is a substantial wiring diagram of the display panel shown in FIG. 3;

FIG. 5 is an explanatory equivalent circuit diagram in a case where hot spot heat is generated when power is generated by a series circuit of color solar cells.

[Explanation of symbols]

Reference Signs List 1A display panel 1C display panel 2 color solar cell or color solar cell module 4 series circuit 5A series circuit by group 5B series circuit by group

Claims (2)

[Claims] 1. A display panel in which a large number of color solar cells or color solar cell modules are provided, and characters, graphics, and the like are displayed by different surface colors of the color solar cells or color solar cell modules. Wherein the color solar cell or the color solar cell module having the different surface colors have similar current characteristics, and a series circuit is formed by them. 2. A display panel in which a large number of color solar cells or color solar cell modules are provided, and characters, graphics, and the like are displayed by different surface colors of the color solar cells or color solar cell modules. In the above, the color photovoltaic cells or color photovoltaic modules having the different surface colors are all grouped by the same plurality of sheets based on approximate current characteristics, and a plurality of group-series circuits are formed for each of these groups. A display panel using color solar cells, wherein the series circuits for each group are connected in parallel.