JPH0736384Y2 - Solar sign - Google Patents

Description

[Detailed Description of the Invention] Field of Industrial Application This invention applies to a sign such as a signboard such as a road guide signboard, a residential signboard, a store signboard, etc. It relates to the solar sign used.

2. Description of the Related Art Display objects used in conventional road guide sign boards, residential display boards, store front signboards, and various other types of structures can be read by sunlight in the daytime, but at night, they are illuminated. You can't read without it.

Therefore, an appropriate illuminating device is provided on the display object to illuminate it appropriately.

Problems to be Solved by the Invention In the above-mentioned display object provided with an appropriate lighting device, since a commercial power line is used as a power source for operating the lighting device, it is possible to place the wiring in a place where wiring is possible. Anyway, without it, lighting is impossible.

Further, even if the commercial power line is wired near the installation location of the display object, wiring work to the installation location is required. Further, there is a problem that wiring work or the like is required every time the installation position is changed.

Therefore, by using a solar cell instead of a commercial power source to secure the necessary power source by utilizing the light energy in the daytime or in a bright place by the solar cell, and by using an EL panel for a display board for characters and figures, Lighting at night is possible.

However, when the solar cell is used as a power source, the solar cell light-collecting panel is attached to the roof of the display object, etc., so that the display structure becomes large and if it is installed on the road, it will be an obstacle to pedestrians and passing vehicles. In addition, the size of the roof of this type of display is severely restricted by law, so it is difficult to use a solar cell.

Furthermore, the place where the solar sign board is installed is installed in a place where buildings and houses are built, so the sunshine conditions are bad,
The display power for lighting is insufficient.

EL as the illumination source (electroluminescence) varies depending on how-load lit, several from several candelas / m ² in comparison with what kind of load system very into luminance several thousand candelas / m ² such as fluorescent lamps Brightness of 100 candela / m ² and low.

Therefore, EL is not suitable as a light source for illuminating other objects or the surroundings, but conversely, as a backlight, this low-brightness surface light source is used for the limited purpose of giving night visibility to the display part such as a sign. It is suitable. That is, a sign such as a sign may be dazzling if it is sufficiently visible by itself and is too bright, or it may add extra light to the surrounding environment and become an obstacle. is there.

However, EL has the following power efficiency for lighting.
It belongs to the lowest class among many light sources.

That is, the EL and the LED (light emitting diode) using the semiconductor electroluminescence effect have extremely poor luminous efficiency (Lm / m: Lument / Watt) as compared with other light emitters.

The LED is a point light source, and the EL is a surface light source, so this inefficiency of light emission is deadly, for example, 1 m ²
If you try to turn on the EL panel of a commercial 100V AC power source at night for 10 hours at an illuminance that can be turned on, the solar cell area required for it will be at a horizontal angle of 42 ° when the sun is in the middle of the sun when the sun conditions are good. Even if it is installed to the south, it requires 6 to 10 times the light emitting area of the EL panel.

Therefore, there is a problem that a large area is required when installing a solar sign using a solar cell outdoors.

Means for Solving the Problems The present invention solves the above-mentioned problems, and an object thereof is to provide a display device that can be installed at any place where light energy can be obtained.

This device uses a solar cell that is a combination of monocrystalline or polycrystalline silicon solar cells and amorphous silicon solar cells as a power source, uses a light emitting part as an EL panel, and can emit light only from the pattern part that gives display information on the EL panel. The total area of the solar cells provided in the display device is EL
The panel is formed so that it does not exceed twice the total area of the light-emitting portion, and the light-emitting electric circuit of the solar cell source has an inverter circuit of a DC power source. From this DC power source, a voltage load is applied to EL via the inverter to emit light. This is a solar sign formed in an EL light emitting power supply circuit in which an inductor is provided between the EL of the EL light emitting circuit and the EL.

Action Photovoltaic power from direct sunlight can be obtained with single crystal or polycrystalline silicon solar cells. The wavelength spectrum of the received light spectrum of an amorphous silicon solar cell is about 0.8.
The short-wavelength component of less than μm, but the spectrum distribution of the irradiation energy of fine weather scatter light excluding direct sunlight component is 0.8 μm
Since the following short-wavelength components occupy almost 82% of that, it is easy to receive scattered light from the sky with an amorphous silicon carbide heterojunction solar cell, and it is possible to obtain an electromotive force by receiving scattered light from the sky. it can.

Embodiment An embodiment of the solar signature of the present invention will be described.

FIG. 1 is a perspective view of a solar sign of the present invention. The upper roof of a display device 2 having a display plate 3 using an EL panel on a base 1 is composed of a solar cell 4, and the solar cell 4 is used as a power source. It makes the panel emit light.

The outer dimensions of the solar cells 4 that make up the roof are 340 m / m x 115 m.
/ m 2 single crystal silicon solar cells 5 (for 24V charging),
External dimensions of 290 m / m × 11 on both sides of the single crystal silicon solar cell 5.
5m / m amorphous silicon solar cell 6 (for 12V charging)
A total of 4 sheets will be installed, 2 sheets each.

EL is a blue-green color with outer dimensions of 474 m / m x 582 m / m and only the light emitting part is patterned and produced.
Form to 1400 cm ² .

As shown in FIG. 2, the display panel 3 using this EL panel has two transparent substrates 7 and 8 formed of two transparent glass plates or synthetic resin plates arranged in parallel with a narrow gap therebetween. The transparent electrode films 9 and 10 are formed on the inner surfaces facing each other by vapor deposition or other means.

Having an electro-optical effect in the narrow gap between the transparent substrates 7 and 8
Provide EL panel 3. The EL panel 3 that serves as a surface light source is a character,
The EL active layer 12a and the ferroelectric layer 12b are formed on the light emitting pattern portion 12 only by the display pattern portion such as a figure by the division printing method or the like, and the other portion transmits a portion corresponding to the light energy indicated by the arrow L. The display device section 2 in which the non-light emitting section 11 is a transparent insulator layer is formed.

Electrode lead wires 13 and 14 connected to the transparent electrode films 9 and 10 are provided at the ends of the display device portion 2 thus formed.

An electric circuit for making the EL display section emit light is formed as shown in FIG.

A solar cell 4 for converting light energy into electric energy is formed by a single crystal silicon solar cell 5 and an amorphous silicon solar cell 6, and the electric energy obtained by this solar cell 4 is accumulated in a secondary battery 21. To be done. 22 is a controller for preventing over-discharge of the secondary battery 21, 23 is a voltmeter, 24 is an ammeter, and 25 and 25 are switches.

The EL lighting electric circuit 26, which is connected to the power supply electric circuit 20 and lights up the EL 27, is an oscillator for alternately opening and closing the P channel and the N channel of the complementary switching elements 28, 28. The frequency of the electric oscillation waveform f (not shown) can be variably set. Also, the EL lighting electric circuit 26 is a buffer capacitor 2
9, 29 Capacitor 30, 4 times step-up transformer 31 and inductor (about 400 m / m Henry) 32.

In addition, D ₁ and D ₂ are backflow prevention diodes, respectively.

The charging current from the solar battery to the secondary battery of this device is about 120 m / mA under the sunshine with the substrate installed almost horizontally around 12 o'clock in Tokyo, about 20 m / mA in the shade / blue sky, and the load current. Is 40m
Including all power consumption in the circuit at / mA, TOTAL load is less than 1 watt.

This device uses the output of the solar cell as a sensor, which is controlled by the controller, and when the illuminance on the solar cell is about 1 hour after sunset, the switches 25 and 25 are closed and EL27 is turned on, and the illuminance on the solar cell surface is changed. Is it over a certain level of illuminance,
Alternatively, when the battery voltage V becomes a certain voltage or less (over discharge limit), the switch 25 opens and the EL 27 turns off. The EL illuminance during lighting is about 16 lux / m ^{2 in} terms of surface illuminance and about 6 candela / m ² .

Next, FIG. 4 is a DC-DC inverter 33 in place of the step-up transformer 31 of the EL lighting electric circuit of FIG. 3 of the embodiment of the first aspect.
And an inductor (500 to 700 m / m Henry) is used. (The same reference numerals in the drawings have the same function.) Also, the solar cell 4 has two single crystal solar cells 5a (for charging 12V) with an outer size of 340 m / m x 115 m / m and 290 m / m. Four pieces of amorphous solar cells 6 (for charging 12 V) of 115 m / m were used.

With this device, the charging current from the solar cell to the secondary battery is almost the same in the sun when the base is placed approximately horizontally at 12 o'clock in Tokyo.
240m / mA, almost 40m / mA in shade / blue sky, load current 50m / mA
So, including all the power consumption in the circuit, TOTAL load is about 600m / m watt. Also, the illuminance of EL is about 16 lux /
m ² , and the brightness is about 6 candela / m ² . DC-D used again
C converter converts 12V DC to ± 48V DC,
It is obtained at an intermediate potential (zero volt potential) terminal and the conversion efficiency is 80% typical.

The difference between the first embodiment and the second embodiment is that, as an EL lighting method, a method of boosting the load voltage after AC exchange with an inverter (the former) and a method of boosting a DC electric wire before inputting to the inverter (the latter). However, the latter is superior to the former in terms of total efficiency in terms of adoption in this device.

In the second embodiment, the charging power in the shade is 480 m / m watts for a load of 600 m / m watts, and the average daily lighting time is, for example, 5 to 6 hours even in a place with no sunshine for one year. If it is limited to, it can be used. It should be noted that the combination of single crystal and amorphous is used for the solar electrode because the power generation capacity per area under direct sunlight is better than that of single crystalline, and in the case of shade scattered light, amorphous is superior to that of spectral absorption. The purpose is to replenish the difference in characteristics between the two, but when the device is used in a place close to one day of insolation, the solar cells in the second embodiment are all amorphous. It is preferable to use.

It should be noted that FIGS. 5 to 9 show an EL lighting electric circuit of another embodiment for lighting the EL connected to the power supply circuit 20 shown in FIGS. (The same reference numerals in the drawings have the same function.) FIG. 5 is a diagram in which buffer capacitors 29, 29 and a capacitor 30 are connected in the EL lighting electric circuit of FIG. 3, and 34 in the drawing is an oscillator. Is.

Fig. 6 shows a DC-DC inverter 33 installed between a DC power supply connection terminal and a pair of capacitors 29, 29 having the same capacity, and connecting between EL27 and the above capacitors 29, 29. is there.

7 shows switching elements 28c, 28d arranged in parallel with the switching elements 28, 28a, 28b, and FIG. 8 shows the switching element 28a of FIG. 7 in the EL lighting electric circuit of FIG. ~ 28d is provided.

The inverter used in the above has a circuit configuration as shown in FIG. 3 or FIG.
Is a fixed frequency sine wave whose pulse width (duty width) can be variably set, or more specifically, whether the pulse width is fixed and the frequency f can be variably set, or frequency f and its sine wave pulse An inverter having an oscillator is used which is characterized in that both widths (duty widths) can be independently variably set.

Further, as shown in FIG. 7 or FIG. 8, the inverter has switching section waves f ₁ and f _{2 having} different pulse widths (duty widths) in which the rising edges of the pulses are synchronized by the same frequency f.
It has two sets of push-pull switching circuits that are opened and closed by the pulse width of frequency f and f ₂ (duty width).
In this case, an inverter having an oscillator capable of independently variably setting each is used.

FIG. 9 shows an EL lighting control electric circuit.

The EL lighting control electric circuit includes a solar cell 4, a storage battery 58 that can be charged and discharged, and a voltage detector 53 that detects an electromotive voltage in the solar cell.
And a voltage detector 55 that detects the terminal voltage of the storage battery 58, a timer 57 that detects and sets the lighting time of the EL, a DC-AC inverter 59 that boosts the DC current from the storage battery and converts it to AC, and a voltage from the inverter output. EL panel generated by applying voltage
When the electromotive voltage generated by 27 and the solar cell 4 is above a certain voltage, the energizing circuit from the storage battery to the inverter 59 is opened, and when the electromotive voltage generated by the solar cell 4 is below a certain voltage, the energizing circuit from the storage battery to the inverter 59 is opened. When it is closed and the terminal voltage of the storage battery 58 is below a certain lower limit voltage, the energizing circuit from the storage battery to the inverter is opened, and the inverter once operates.
When the EL27 lights up, the timer 57 operates, and when the lighting time exceeds the set time of the timer, the energizing circuit from the storage battery to the inverter is opened, and the terminal voltage of the storage battery is fully charged when charging by the solar cell. If the voltage exceeds the upper limit voltage of the terminal and is above a certain set voltage, the charging circuit from the solar cell to the storage battery is opened, and the electromotive voltage of the solar cell is below a certain voltage. The lighting time after the inverter is activated (after EL lighting) is the timer setting time Below, the control circuit is configured to switch the circuit so that the energizing circuit from the storage battery to the inverter is closed only when all the conditions that the terminal voltage of the storage battery is equal to or higher than a certain lower limit voltage are satisfied.

Effect of the invention The solar sign of this invention converts light energy when it is bright in the daytime into electric energy and stores it. It is used as a lighting power source for the display part such as a guide display board, so that the place where commercial power line is not wired. But it can be installed and used.

In addition, when the display unit is turned on, only a display such as a character or a figure is turned on, so that power consumption is not required.
Further, since the solar cell is a combination of the single crystal silicon solar cell and the amorphous solar cell, it is possible to collect a larger amount of light energy than the conventional solar cell even in a place where the direct sunlight is poor and the sunshine condition is bad. Therefore, power shortage during the lighting time does not occur.

Further, the light receiving panel of the solar cell provided on the roof portion of the display device can be miniaturized, so that it will not interfere with pedestrians, passing vehicles, etc. when installed on the street.

[Brief description of drawings]

Fig. 1 shows an embodiment of the solar signature of the present invention. Fig. 1 is a perspective view of the solar signature, Fig. 2 is a sectional view of an EL display plate which can be partially omitted, and Figs. It is a circuit diagram of a circuit. 1 ... Substrate 2 ... Display device 3 ... EL display plate 4 ... Solar cell 5, 5a ... Monocrystalline or polycrystalline silicon solar cell 6 ... Amorphous silicon solar cell 20 ... Power supply circuit 26 ... EL Lighting electric circuit

Claims (2)

[Scope of utility model registration request] 1. A solar cell power source using a single crystal or polycrystal silicon solar cell and an amorphous silicon solar cell or an amorphous silicon carbide heterojunction cell in combination; A display device in which a panel is divided into a light emitting portion and a non-light emitting portion in the same panel by a division printing method or the like; light energy is converted into electric energy by the solar cell, and the EL panel is caused to emit light at night by charged power. A solar sign characterized by comprising a light-emitting electric circuit. 2. A light-emitting electric circuit of a solar cell power source has a direct current power source and an inverter circuit, and between the direct current power source and the EL of the EL light emitting circuit for applying a voltage load to the EL through the inverter to emit light. The solar sign according to claim 1, comprising an EL light emitting power supply circuit provided with an inductor.