JPH0897456A - Solar cell power generator - Google Patents

Abstract

PURPOSE: To easily find a defective solar cell panel, without using a circuit tester, etc., by providing reverse bias-preventing, bypassing and indicating light emitting diodes connected anti-parallel to the panels. CONSTITUTION: Each of light emitting diodes 7 is, when a reverse bias is applied due to a photovolatic force of other solar cell panel 1, forward biased to turn on and forward current flows. Similarly to the conventional bias diode, this prevents the reverse bias of each solar cell panel 1 from being applied. Each diode 7 lights due to the flow of the bias current. So far as an incident light on each panel 1 is not obstructed, the diode 7 of only a solar cell panel 1 (defective panel) providing no output because of failure lights. Thus, this panel can be found easily, without using a circuit tester, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell power generator formed by connecting a plurality of solar cell panels.

[0002]

2. Description of the Related Art Conventionally, a solar cell panel used in a photovoltaic power generation facility has a power generation output of about 15 V and several tens of sheets.
It is about W. Therefore, when the generated output of this solar cell panel is used for electric power, several tens of solar cell panels 1 are connected in series as shown in FIG.
A solar cell power generator of 00V and several hundred W is constructed.

Further, in FIG. 6, reference numeral 2 denotes a constant current source for displaying an equivalent circuit of each solar cell panel 1, which generates a photovoltaic power having a polarity of an arrow line. Reference numeral 3 denotes an internal diode of each solar cell panel 1 connected in antiparallel to the current source 2. Reference numeral 4 is a load to which the series combined output of each solar cell panel 1 is supplied. Then, as shown in FIG. 7A, each solar cell panel 1 is formed by attaching the solar cell 1a on the front side thereof to the frame body 1b.

Further, in the case of a type of about 10 W or more generally called for electric power, a connection box 6 is provided on the back surface (rear surface) side of the solar cell panel 1 as shown in FIG. Adjacent panels, etc. are connected via cables drawn from the positive and negative terminal blocks. Since the junction box 6 is used outdoors, packing is attached to the lid of the junction box 6 to ensure waterproofness and airtightness.

By the way, in the case of the solar cell generator of FIG. 6, when the incident light from any one of the solar cell panels 1 is blocked, no photovoltaic power is generated in this panel 1 and the current source 2 is equivalent to the equivalent circuit. Disappears and only the internal diode 3 remains. At this time, the total sum of the photovoltaic voltage of each of the remaining solar cell panels 1 (series combined voltage) is applied as a reverse bias to the non-output solar cell panel 1 having only the internal diode 3.

If the reverse bias voltage exceeds a predetermined value, the solar cell 1a of the non-output solar cell panel 1 may be destroyed due to an avalanche effect or the like. Therefore, in this type of conventional solar cell power generation device, as shown in FIG. 8, a reverse bias preventing bypass diode 5 is connected in antiparallel to each solar cell panel 1, and the diode 5 applies the reverse bias. Is prevented.

[0007]

In the case of the above-mentioned conventional solar cell power generator, in order to find out a solar cell panel (failure panel) 1 that has failed due to maintenance and inspection work, the output of each solar cell panel 1 is calculated one by one. It has to be measured by a tester or the like to test each state, which requires complicated work.

Moreover, when the leads of the tester are brought into contact with the terminal block of the connection box 6 for measurement, since the connection box 6 is provided on the back side of each solar cell panel 1, each solar cell panel 1 is arranged. Depending on the circumstances, it is difficult to open and close the junction box 6, which makes the work extremely difficult. That is, in the case of the conventional device, there is a problem in that the failed panel cannot be easily found, and the maintenance and inspection work cannot be simplified and made more efficient.

An object of the present invention is to make it possible to easily find a defective panel without using a tester or the like.

[0010]

In order to achieve the above-mentioned object, in a solar cell power generator of the present invention according to claim 1, a reverse bias prevention bypass and a reverse bias connected to each solar cell panel are connected in parallel. A light emitting diode for displaying the status is provided.

Further, in the solar cell power generator of the present invention according to claim 2, a reverse bias bypass diode connected in the reverse direction to each solar cell panel and a light bulb lit by the forward bypass current of the diode. The series circuit with the status indicator of the configuration is connected in parallel.

Further, in the solar cell power generator of the present invention according to claim 3, a status indicator lamp comprising forward light emitting diodes or light bulbs connected in series to each solar cell panel, and the solar cell panel and status indicator. A reverse bias preventing bypass diode connected in anti-parallel to each series circuit of the lamp.

[0013]

In the solar cell device of the present invention according to claim 1 configured as described above, when the incident light of each solar cell panel is not interrupted, the light emitting diode of the normal solar cell panel is A photovoltaic panel that has failed due to being reverse biased by photovoltaics and kept turned off.
The light-emitting diode of (1) is forward-biased by the photovoltaic power of the remaining solar cell panel and lights.

Therefore, a defective solar cell panel is found by visually inspecting the light emitting diodes of each solar cell panel for turning on and off, without using a tester or the like. Further, in the defective solar cell panel, application of a reverse bias based on the photovoltaic power of the remaining solar cell panels is prevented by the bypass action of the light emitting diodes.

Next, in the case of the solar cell power generator of the present invention according to claim 2, only the status indicator lamp of the defective solar cell panel is turned on, and in this case also, the status indicator lamp of each solar cell panel is turned on and off. A broken solar cell panel is discovered from.

Further, in the case of the solar cell power generator of the present invention according to claim 3, in a normal solar cell panel, the reverse bias preventing bypass diode is turned off, and the serially connected status indicator lamp of this panel is turned on. In the defective solar cell panel, the reverse bias prevention bypass diode is turned on, and the serially connected status indicator lamp of this panel is turned off. Therefore, in this case as well, the defective solar cell panel is found by turning on and off the status indicator lamp of each solar cell panel.

[0017]

EXAMPLES Examples will be described with reference to FIGS. 1 to 5. (First Embodiment) First, a first embodiment corresponding to claim 1 will be described with reference to FIGS.

In these drawings, the same reference numerals as those in FIGS. 6 to 8 designate the same or corresponding parts, and the difference from the conventional device of FIG. 8 is that, as shown in FIG. Instead of the bypass diode 5, a reverse bias preventing bypass / state display light emitting diode 7 is provided.

When a reverse bias based on the photovoltaic power of another solar cell panel 1 is applied to each light emitting diode 7, the light emitting diode 7 is forward biased by the reverse bias and turned on, and a forward bypass current flows. Similarly to the conventional bypass diode 5, application of reverse bias to each solar cell panel 1 is prevented.

Further, since each light emitting diode 7 is turned on by the flow of the bypass current, the solar cell panel which has failed and has no output in the state where the incident light of each solar cell panel 1 is not interrupted (failure). Only the light emitting diode 7 of the panel 1 is turned on.

Therefore, when carrying out maintenance and inspection, it is easy to visually check whether each light-emitting diode 7 is turned on or off while the incident light of each solar cell panel 1 is not blocked, without using a tester or the like. Failure panel 1
Is discovered.

Moreover, since each light emitting diode 7 is used both as the conventional bypass diode 5 and the status indicator lamp of the solar cell panel 1, the number of parts does not increase and the structure does not become complicated.

Each light emitting diode 7 may be mounted on the panel surface of the solar cell panel 1 as shown in FIG. 2, or as shown in FIGS. 3 (a) and 3 (b).
It may be provided in the connection box 6 on the back surface of the.

FIG. 3B shows a state in which the lid of the connection box 6 is removed, and 7a and 7b are positive and negative terminal blocks 8a and 8b.
Two light emitting diode elements are provided in parallel between them to form a diode 7. 9a and 9b are outlets for connecting cables.

When the light emitting diode 7 is provided in the connection box 6 as shown in FIGS. 3 (a) and 3 (b), the light emitting diode 7 can be seen from the outside through the lid, so that the lid is closed. Opening and closing is unnecessary, and maintenance and inspection work can be performed very easily regardless of the arrangement of the solar cell panels 1.

(Second Embodiment) Next, a second embodiment corresponding to claim 2 will be described with reference to FIG.
In the figure, the same reference numerals as those in FIG. 8 indicate the same or corresponding ones, and the difference from the conventional device is that each solar cell panel 1 has a reverse-bias preventing bypass diode 5 connected in the reverse direction, and the diode 5 The point is that a series circuit is connected in parallel with an incandescent electric bulb 10 as a status indicator lamp that is turned on by a bypass current in the forward direction.

The light bulb 10 is replaced with the bypass diode 5
Since the light is turned on by the bypass current of 1), when the maintenance inspection is performed in a state where the incident light of each solar cell panel 1 is not blocked, as in the case of the first embodiment, the light bulb 10 of the failure panel is
Only lights up.

Therefore, the light bulb 1 of each solar cell panel 1
By visually inspecting whether 0 is turned on or off, the defective panel can be easily found. In addition, the light bulb 10 may be provided on the panel surface of the solar cell panel 1, or may be provided on the connection box on the back surface thereof.

(Third Embodiment) Next, a third embodiment corresponding to claim 3 will be described with reference to FIG.
In the figure, the same reference numerals as those in FIG. 8 indicate the same or corresponding ones, and the difference from the conventional device is that a light emitting diode 11 as a status indicator lamp is forward-connected to each solar cell panel 1 in a forward direction. This is a point in which a reverse bias preventing bypass diode 5 is connected in antiparallel to each of the series circuits of the panel 1 and the light emitting diode 11.

In the case of this embodiment, the bypass diodes 5 are reverse-biased by the photovoltaic power of each solar cell panel 1 to be turned off, and the light emitting diode 11 is turned on when each solar cell panel 1 is normal. Therefore,
In the case of this embodiment as well, the defective panel can be easily found by visually inspecting whether the light emitting diode 11 is turned on or off.

The light emitting diode 11 may be provided on the panel surface of the solar cell panel 1 or may be provided on the connection box on the back surface thereof. Further, an incandescent lamp or the like may be used as the status indicator lamp instead of the light emitting diode 11.

[0032]

Since the present invention is configured as described above, it has the following effects. First, in the case of the solar cell device of the present invention according to claim 1, when the incident light of each solar cell panel 1 is not blocked, the light emitting diode 7 of the normal solar cell panel 1 is affected by the photovoltaic power of the panel 1. The light-emitting diode 7 of the defective solar cell panel 1 is reverse-biased and kept turned off, and is forward-biased by the photovoltaic power of the remaining solar cell panel 1 to be turned on.

Therefore, the defective solar cell panel 1 can be found without using a tester or the like by visually inspecting whether the light emitting diode 7 of each solar cell panel 1 is turned on or off, which simplifies the maintenance and inspection work. Efficiency can be improved.

In the case of the solar cell power generator of the present invention according to claim 2, only the status indicator lamp (light bulb 10) of the defective solar cell panel 1 is turned on, and the status indicator lamp of each solar cell panel 1 is turned on. The faulty solar cell panel 1 can be found from lighting and extinguishing, and the same effect as in the case of the invention according to claim 1 can be obtained.

Further, in the case of the solar cell power generator of the present invention according to claim 3, the reverse bias preventing bypass diode 5 of the normal solar cell panel 1 is turned off, and the panel 1
The status indicator lamp (light emitting diode 11) serially connected to is turned on, the reverse bias preventing bypass diode 5 of the defective solar cell panel 1 is turned on, and the status indicator lamp serially connected to the panel 1 is turned off.

Therefore, also in this case, each solar cell panel 1
The faulty solar cell panel can be found from the turning on and off of the status indicator lamp, and the same effects as those of the inventions according to claims 1 and 2 can be obtained.

[Brief description of drawings]

FIG. 1 is a connection diagram of a first embodiment of the present invention.

FIG. 2 is a perspective view of the solar cell panel showing an example of mounting the light emitting diode according to the first embodiment of the present invention as viewed from the front side.

FIG. 3A is a perspective view of the solar cell panel showing another example of mounting the light emitting diode according to the first embodiment of the present invention viewed from the back side, and FIG. 3B is a connection box of FIG. 3A. It is a top view in the state where the lid was removed.

FIG. 4 is a connection diagram of a second embodiment of the present invention.

FIG. 5 is a connection diagram of a third embodiment of the present invention.

FIG. 6 is a connection diagram of an example of a conventional device.

7A and 7B are perspective views of the solar cell panel of FIG. 6 viewed from the front side and the back side, respectively.

FIG. 8 is a connection diagram of another example of the conventional device.

[Explanation of symbols]

1 Solar Cell Panel 5 Reverse Bias Prevention Bypass Diode 7 Light Emitting Diode for Reverse Bias Prevention Bypass and Status Display 10 Light Bulb as Status Indicator 11 Light Emitting Diode as Status Indicator

Claims (3)

[Claims] 1. A solar cell power generation device formed by connecting a plurality of solar cell panels in series, comprising a reverse bias preventing bypass and a status display light emitting diode connected in anti-parallel to each of the solar cell panels. A solar cell power generator characterized in that 2. A solar cell power generation device formed by connecting a plurality of solar cell panels in series, wherein each of the solar cell panels has a reverse bias connection bypass diode for preventing reverse bias and a forward diode of the diode. A solar cell power generation device characterized in that a series circuit is connected in parallel with a status indicator lamp having a light bulb configuration that is turned on by a bypass current. 3. A solar cell power generation device formed by connecting a plurality of solar cell panels in series, wherein a status indicator light comprising forward light emitting diodes or light bulbs connected in series to each of the solar cell panels, A solar cell power generation device comprising: a reverse bias prevention bypass diode connected in anti-parallel to a series circuit of a solar cell panel and the status indicator light.