JPH0318890A - Light emitting device with solar battery - Google Patents

Abstract

PURPOSE:To execute a practical illumination even if the capacity is small by storing in advance electric power obtained by a solar battery at the time of a power generation mode, and executing the illumination by using this electric power only when a light beam is detected at the time of a detection mode. CONSTITUTION:In the daytime, that is, at the time of a power generation mode, a daytime/night switch 11 detects a variation of the outdoor light quantity and decides daytime or night, and in the case of the daytime side, such an operation as a solar battery panel 1 is switched to an inclination which can absorb efficiently a solar light, etc., is executed, and generated electric power is charged immediately to a battery 4. Also, when night comes, a daytime/night switch 10 connects the solar battery panel 1 and a prescribed time lighting device 8, and when a minute current is generated from the solar battery panel 1 due to optical energy of an automobile light, etc., it is amplified in the prescribed time lighting device 8, and when an automobile approaches and this signal exceeds a prescribed level, a lighting equipment 2 is lighted for a prescribed time. In such a way, even if an area of the solar battery 1 and the capacity of a power storage means 4 are small, the illumination can be executed efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of use in the IT industry] The present invention relates to a light emitting device with a solar cell that is equipped with a solar cell panel and emits light at night using electrical energy supplied by the solar cell panel.

INDUSTRIAL APPLICABILITY The present invention can be effectively utilized, for example, as a light-emitting device with a solar cell that illuminates a billboard or emits light at night.

[Prior Art] Conventionally, outdoor advertisements have been placed not only in urban areas but also everywhere because of their high advertising effectiveness. However, when attempting to install an outdoor billboard with night lighting, for example on a road leading to the suburbs, the following problems often occur.

(1) There is no power distribution equipment nearby, so electricity for lighting cannot be obtained.

(2) Even if there is a power supply facility nearby, maintenance costs such as electricity for lighting or electrical system management costs are required.

(3) Due to power supply equipment, the installation location of outdoor billboards is limited.

For this reason, many outdoor billboards such as roadside billboards are not illuminated at night, which is one of the factors that reduces advertising effectiveness.

In order to solve this problem, an outdoor billboard with solar cells as shown in FIG. 7, for example, has been considered. In the figure, power supplied from the solar cell panel 1 is charged into a storage battery 4 during the day, and at night, power is supplied from the storage battery 4 to the lighting fixture 2 to provide nighttime illumination. Further, discrimination between day and night is performed by a day/night switch 7, which selects charging of the storage battery 4 or lighting of the lighting fixture 2.

[Problems to be Solved by the Invention] However, the conventional example described above has the disadvantage that the area of the solar cell and the capacity of the required storage battery become large.

For example, if you plan to use a 100-meter lighting fixture for 8 hours at night, the amount of solar radiation per day will be 10 MJ/m'' (
Equivalent to the monthly average daily amount of total solar radiation in February in Tokyo), a simple calculation assuming that the solar cell module efficiency is 5% is approximately 6.
This requires a solar cell panel of rn' and a storage battery capable of charging and discharging electric power of 80011 hours, which increases the equipment cost and increases the size of the entire device, making it impractical.

Another problem is that the advertisements are illuminated even when there are no cars or no one around, so the advertisements are not energy efficient.

Another problem is that solar cells are not used at all at night.

[Object of the Invention] In view of the above problems, the present invention provides a light emitting device with a solar cell that can provide practical and efficient lighting even if the area of the solar cell and the capacity of the power storage means are small. The purpose is to

[Means for solving problems] The present invention is a means for solving the above-mentioned problems.

A solar cell having a power generation mode in which power is generated by receiving light and a detection mode in which light is detected; and a switching means for switching between the two modes.

J? that stores electric power generated by the solar cell in the power generation mode. ! means; and a light emitting means for emitting light using electric power stored in the electricity storage means when light is detected by the solar cell in the detection mode.

A light emitting device with a solar cell is provided.

[Embodiment] FIG. 1 is a block diagram showing an example of the basic configuration of the present invention.

In the figure, l is a solar panel used in the light generation mode and the detection mode, and a day/night switch 10.1 is used as a means for switching between the two modes.
1.

Reference numeral 4 denotes a storage battery that stores electric power generated during the power generation mode.

Reference numeral 9 denotes a tilting mechanism that switches the tilt of the solar cell panel l between the power generation mode and the detection mode.

Further, 8 is a part of the lighting means, and when light is detected by the solar panel 1 in the detection mode, the lighting equipment 2
This is a lighting device for a certain period of time.

In the figure, first, the operation during daytime 4, that is, the power generation mode, will be explained. The day/night switch 11 detects changes in the amount of outdoor light and determines whether it is day or night.

In the case of daytime, power from the storage battery 4 is supplied to the tilting mechanism 9,
Place the solar panel horizontally or use sunlight efficiently.
Switch to a slope that can be absorbed. The electric power generated by the solar panel 1 is immediately charged into the storage battery 4. Further, the day/night switch 10 is open during the day, and the current from the solar panel does not flow to the lighting device 8 for a certain period of time, so the lighting fixture 2 is not lit either.

On the other hand, at night, that is, in the light detection mode, the day/night switch 11 is set to the night side, and thereby the tilt mechanism 9 switches the tilt of the solar panel 1 to the vertical position or to a position facing downward.

In order to prevent the output voltage of the solar cell panel l from decreasing and the current flowing backward from the storage battery 4 side to the solar cell panel side, it is preferable to provide a backflow prevention means 16 such as a backflow prevention diode immediately before the storage battery 4.

In addition, the day/night switch 1O operates to connect the solar panel 1 and the lighting device 8 for a certain period of time at night.
When a minute current is generated from the solar panel due to light energy from a car light, etc., it is amplified in the lighting device 8 for a certain period of time, and when a car approaches and this signal exceeds a certain level, the lighting device 2 is turned on for a certain period of time. .

FIG. 2 shows an embodiment of the tilting mechanism 9 and the solar panel 1 according to the present invention. In the figure, the tilting of the solar panel 1 is performed by an electric motor 12, and the position 14 and Switch the nighttime digit N13. Therefore, the electric motor 12 is a DC motor or the like that rotates in reverse depending on the positive or negative power supply, and the day/night switch 11 that controls the motor is wired so as to supply electric power in reverse during the day and night. In addition, to prevent power consumption during holding position, limit
It is necessary to provide a switch, etc.

FIG. 4 shows an embodiment of the electrical system of the solar panel 1, storage battery 4, day/night switch 10, fixed time lamp 8, and lighting fixture 2 according to the present invention. Explain the function. Since the day/night switch 10 is closed at night, the signal current due to the weak light received by the solar panel 1 is amplified by the current input amplifier A1 through the day/night switch 10 and output as a voltage signal. R,,
C, is an RC filter for removing noise and relatively fast signal fluctuations. The voltage signal that has passed through the RC filter is further input to an AND circuit Nl. The other signal of NI is true only when luminaire 2 is off. Therefore, when light above a certain level is incident on the solar panel and the lighting fixture 2 is turned off, A
The output of the ND circuit N1 becomes true. This causes diode D2. C2 is charged through resistor R2, transistor TI is turned on, and lighting fixture 2 is lit. but,
Since the charge stored in C2 is gradually discharged through R3, R3G? Transistor T1 after a time determined by
is turned off, and the lighting fixture 2 is turned off. Therefore 0
By selecting appropriate values for 2 and R3, the lighting time can be arbitrarily adjusted.

Hereinafter, an outdoor advertising device incorporating the solar cell-equipped light emitting device of the present invention will be described in detail based on specific examples.

[Example 1] Showing an example in which an outdoor advertising device incorporating the device of the present invention is installed in the suburbs of Tokyo, the solar cell panel 1 is 3rn',
An amorphous silicon thick-ga battery with a module efficiency of 5% and an output voltage of 24V is used. 5 as lighting equipment 2
Install two 0w24v incandescent lights. A lighting device 8 for a certain period of time to turn on the lighting equipment 2. and the time constant R3C2 is about 3
minutes (Ω in R3-100, C2-300 JLF), the light will be on for about 3 minutes after the car light is detected. Further, as the storage battery 4, a lead storage battery with an IKWh of 24V is used. In addition, the tilting mechanism 9 is a 24V DC motor.
, outdoor advertising like 0 or more that uses 40W to change the tilt of the solar panel l in 30 seconds! If the IC device is used during the winter season (December) when the amount of solar radiation is the lowest, the average amount of solar radiation per day is 7.4 MJ/ffl'.

The energy stored in the storage battery during the day is approximately 3oowh. Of this energy, the energy required to switch the tilt of the solar panel l between morning and evening is about IWh, which is less than 1% of the stored energy. If the actual lighting time at night is 5 oz, the billboard can be effectively illuminated for 6 hours.For example, if the lighting starts at 6 o'clock on the street, it can be illuminated until 12 o'clock. be. This doubles the effective lighting advertising time compared to 3 hours when the lights are turned on continuously.

Also, to provide continuous lighting for 6 hours.

Although a solar cell panel of 6rn' is required, in this embodiment, by carrying out the present invention, only half the area of 3rn' is required, reducing both the size and cost of the advertising device.

[Example 2] FIG. 5 shows a second embodiment of the present invention.

In the figure, a monocrystalline silicon solar cell with a length of 1.5 m', an output voltage of 24 V, and a module efficiency of 15 is used as the solar cell panel l. Billboard 5 faces north,
The tilting mechanism 9 fixes the solar panel 1 at a position 14, that is, at a position tilted by about 30 degrees from the water mower, in order to efficiently receive sunlight during the day. Also, at night, in order to avoid disturbances such as moonlight and to efficiently receive car lights, it is fixed at FF113 at an angle of about 30" from the vertical. By doing this, at least the moonlight is not directly incident on the solar panel l. A 24V 40W DC motor is used for the tilt mechanism 9, and the tilt of the solar panel 1 is switched from 14 to 13 or from 13 to 14 in 30 seconds.

100V8011 (5QH2
)17) Use a fluorescent light, and the power supply to this fluorescent light is 24V.
lK11h lead acid battery 4 to DC-AC converter 15
(24V DC4100VAC50H2 conversion efficiency 90 ri) If this billboard is installed at the same place and time as in Example 1, it will provide 7 hours of continuous illumination, that is, the actual lighting time will be 5oz.

Advertising can be effectively illuminated for 14 hours.

[Example 3] The wSB diagram shows a third example of the present invention. In the figure, the billboard 5 faces south, and the solar cell panel 1 includes a CdS/CdTe heterojunction thin film solar cell (3rn ',
A module efficiency of 1 oz and an output voltage of 24 V) is used. During the day, it is tilted about 30" from the horizontal to efficiently receive sunlight (Fig. 6, 14), and at night, it is tilted about 30 degrees from vertical to efficiently receive car lights (Fig. 6, 13).
), switched by the tilting mechanism 9.

In addition, the advertising board 5 is transparent or semi-transparent here,
Illumination is performed from the back side of the advertising board 5 by the lighting equipment 2,
Lighting fixture 2 has 115V 400H2O 12 layers A/c
yellow-green electroluminescent lumen of rn' (l
rn'') is used.Power supply to the lamp j*Dc/
AC=+y bar 915 (24VDC→115V400
If a zero advertising device with a Hz conversion efficiency of 8 oz) is installed at the same place and time as shown in Example 1,
800Wh of electricity during the day can be stored in 4 storage batteries (l KWh 2
4V), and if the actual lighting time during the nighttime lighting is 501, the billboard can be effectively illuminated for about 5 hours.

At this time, if an attempt is made to provide continuous illumination for 5 hours, the area of the solar panel 1 will be doubled to 6 square meters, which is extremely large, and the capacity of the storage battery will also be doubled, to about 2 KWh. As described above, by implementing the present invention, it is possible to significantly reduce the size of solar cell panels and storage batteries, and to reduce costs.

[Other Embodiments] In addition to the embodiments described above, the tilting mechanism 9 of the solar panel l may be tilted around the center line of the solar panel l as shown in FIG. 3, for example. good.

In addition, the solar panel l can be installed at any location that can fulfill its function, such as the top of the billboard as shown in the conventional example shown in Figure 7, or the bottom of the back side or the bottom of the front side of the billboard. , you can install it anywhere.

In the above embodiments, an automobile is exemplified as a vehicle, but the vehicle may also be a train, a bike, or the like.

Further, the light emitting device of the present invention can be used not only for indirect illumination of billboards, but also for devices such as advertisements in which the light emitting devices themselves are arranged in the shape of letters.

As explained above, the solar cell-equipped light emitting device of the present invention can be used in an outdoor advertising device, and the tilt of the solar panel can be switched between daytime and nighttime, so that it can be used for power generation during the daytime and for detecting vehicle lights at nighttime. and by providing means for illuminating the advertisement for a period of time after the light is detected.

The following effects can be obtained.

(1) The area of the solar panel and the capacity of the storage battery can be reduced, reducing costs and downsizing the entire device.

(2) At night, since the lights are only illuminated when the vehicle approaches, effective and energy-efficient advertising can be provided, especially to the passengers of the vehicle.

(3) Since a solar panel is used as a light sensor at night, it can detect light over a larger area than a normal light sensor, and can detect a vehicle even if it is far away.

Although the above embodiment shows an example in which the present invention is applied to an outdoor advertising device, the present invention is not limited to the embodiment, and can be used as a device for display other than advertisements, or as a device for displaying things other than advertisements. Naru Teru IJI! As ItI or a light emitting device,
You can also use it.

[Effects of the Invention] As described above, according to the present invention, the electric power obtained by the solar cell during the 1 generation mode is stored, and the above-mentioned electric power is stored only when light is detected by the solar cell during the detection mode. Since the solar cells can be used to provide lighting, it is possible to improve the efficiency of energy use, and even if the area of the solar cell and the volume of the power storage means are small, practical lighting is possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a light emitting device with a solar cell according to the present invention, FIGS. 2 and 3 are diagrams showing a specific embodiment of the tilting mechanism 9 shown in pIS 1, and FIG. 4 is a diagram similar to that shown in FIG. An example of a specific circuit diagram. 5 and 6 show an embodiment of the structure of the device of the present invention, and FIG. 7 shows a conventional example. (2) Explanation of the symbols representing the main parts of the drawing 1. Solar cell panel; 2. Lighting equipment 3, support frame 4
．． Storage battery 5, advertising board 6. Upper stand? , 10.11 Day/night switch 8. fixed time lighting device 9;
Tilt mechanism 12. Electric motor 13, nighttime solar panel position 14, daytime solar panel position 15, DC-AC converter 16, backflow prevention means

Claims (2)

[Claims] (1) A solar cell having a power generation mode in which power is generated by receiving light and a detection mode in which light is detected, a switching means for switching between the two modes, and a storage battery that stores power generated by the solar cell in the power generation mode. A light emitting device with a solar cell, comprising: a light emitting device that emits light using electric power stored in the power storage device when light is detected by the solar cell in the detection mode. Device. (2) The solar cell according to claim 1, wherein the solar cell is oriented in a direction in which sunlight can be efficiently absorbed in the power generation mode, and in the direction of a light source to be detected in the detection mode. Equipped with light emitting device.