JP4805097B2 - Self-luminous road fence - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a self-luminous road fence that can efficiently use energy from sunlight for light emission in a road fence that emits light from a light emitter using electric power generated by a solar cell.

  As a self-luminous road fence that can efficiently use energy from sunlight for light emission, for example, a light transmission panel provided at the upper part of the fence main body and having an upper surface set almost the same as the road surface, and through the light transmission panel A light emitter capable of emitting light in a substantially horizontal direction, a solar cell provided below the light transmissive panel, an electric double layer capacitor for storing an electromotive force of the solar cell, and an electromotive force of the solar cell. Charging control means for controlling and charging the electric double layer capacitor; a blinking control circuit for outputting a driving current for blinking the light emitter using the electric double layer capacitor as a power source; and pulse-modulating and driving the driving current An oscillation circuit that outputs a modulated pulse current; and power feedback means that converts a part of the pulse current into feedback power and feeds it back to the electric double layer capacitor. The power feedback means comprises a current detection circuit that detects the pulse current, and a rectification amplification circuit that rectifies and amplifies the detection output of the current detection circuit, and the light emitter is driven to blink by the pulse current, The self-luminous roadway constructed so that the output of the rectifying and amplifying circuit is fed back to the electric double layer capacitor and can be stored can effectively store the electromotive force of the solar cell and increase the use efficiency of sunlight. The structure made in this way is disclosed.

Japanese Patent Application Laid-Open No. 09-041333

  However, in the conventional self-luminous roadway as described in Patent Document 1, power is simply used by simply circulating the output of the rectifying and amplifying circuit to the power storage means. Since it is extremely small, the degree of efficient use of energy from sunlight is extremely small, and when used in places where solar cells are frequently shaded, such as in mountainous areas and urban areas, it is still a power storage means. There was a high possibility that the electric power stored would be insufficient.

  The present invention has been made in view of the problems as described above, and is intended to provide a self-luminous roadway which can use solar energy with high efficiency.

In order to achieve the above object, the present invention is configured as follows. That is, the self-luminous road fence according to the present invention includes a solar cell, a power storage means for storing power generated by the solar battery, a light emitter, and a control for controlling the power supplied from the power storage means to emit light from the light emitter. And the storage from the solar cell to the storage means is performed via the maximum power point tracking circuit, and the maximum power point tracking circuit is configured such that the output voltage is in a state where the solar cell and the storage means are connected. When the voltage becomes lower than the solar cell voltage, the intervention of the maximum power point tracking circuit is canceled .

  According to the self-luminous roadway according to the present invention, the maximum power point tracking circuit takes out power from the solar cell at the maximum current value regardless of the charging voltage of the power storage means, and the power voltage is charged to the power storage means. The battery can be charged by boosting the voltage according to the voltage suitable for the system, and even when installed in a place where the amount of sunlight is low, the maximum power can be extracted from the solar cell and the energy from sunlight can be used with high efficiency. can do.

The maximum power point tracking circuit is configured to cancel the intervention of the maximum power point tracking circuit when the output voltage becomes lower than the solar cell voltage when the solar cell and the power storage means are connected . since, by eliminating the power consumption by the maximum power point tracking circuit to release the maximum power point tracking circuit in a state where it is not necessary to use a maximum power point tracking circuit, Ru can allow further use by high efficiency energy by solar light .

  The power is extracted from the solar cell with the maximum current regardless of the charging voltage of the power storage means by the maximum power point tracking circuit according to the present invention, and the power is boosted to a voltage suitable for charging the power storage means by the booster circuit. By being able to be charged, even when installed in a place where the amount of sunlight is small, the maximum electric power can be taken out from the solar cell and the energy from sunlight can be used with high efficiency.

  BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment according to the present invention will be specifically described below with reference to the drawings.

  FIG. 1 is a circuit block diagram of an embodiment of a self-luminous road fence according to the present invention. First, in FIG. 1, a solar cell 1 is a power generation device that directly converts solar energy into electric energy, and can be used in any of a crystalline system, an amorphous system, and a compound system. The electric power generated by irradiating the solar cell 1 with light such as sunlight is stored in the power storage means 2 that is an electric double layer capacitor. This electric double layer capacitor 2 utilizes the dielectric phenomenon of the electric double layer, and about 50 Farads have been put into practical use. In this embodiment, the power storage means 2 which is a 50 Farad electric double layer capacitor which has been put into practical use is used.

  The power generated by the solar cell 1 is extracted by the maximum power point tracking circuit 3 at the maximum current value. The maximum power point tracking circuit 3 includes a storage circuit 31, a control circuit 32, and a booster circuit 33. The extracted power is boosted to a voltage suitable for storing power in the power storage means 2 by the maximum power point tracking circuit 3. This makes it possible to use solar energy with high efficiency.

  As a power storage method to the power storage means 2 by the maximum power point tracking circuit 3, for example, a method called a hill climbing method shown below can be used. Specifically, the open voltage of the solar cell 1 = a (V), the solar cell voltage when the solar cell 1 and the storage means 2 are connected = b (V), the optimum operating voltage of the solar cell 1 = c ( V), the maximum power point tracking circuit 3 stores the voltage a and the voltage c corresponding to the voltage a in the storage circuit 31, and the control circuit 32 makes it possible to measure the voltages a to c one by one. . Next, the voltage c corresponding to the open circuit voltage a of the solar cell 1 is read from the storage circuit 31 to the control circuit 32, and the power of the voltage c is output by the control circuit 32 by, for example, a pulse by PWM control. Output power. Here, the voltage d can also be measured by the control circuit 32. When the voltage d detected by the control circuit 32 is smaller than the voltage b, the voltage d is further increased by the booster circuit 33, and this operation is performed by the voltage b. Repeat until voltage d. By outputting power from the maximum power point tracking circuit 3 in the state of voltage b = voltage d, the optimum voltage for charging the power storage means 2 even when the open voltage a of the solar cell 1 is lower than the voltage b. The charging by b can be performed.

  In addition, when the optimum operating voltage c of the solar cell exceeds the voltage b suitable for power storage in the power storage means 2, it is not necessary to increase the voltage by the maximum power point tracking circuit 3, so the maximum power point tracking circuit 3 is released. It is preferable to do this. By canceling the maximum power point tracking circuit 3, the power consumed by the maximum power point tracking circuit 3 can be eliminated and the power can be used more efficiently. Further, it is preferable that the measurement of the voltage c by the control means 32 is continued and the maximum power point tracking circuit 3 is operated when the voltage c falls below the voltage b again.

  The electric power stored in the electric storage means 2 is made a predetermined voltage by the discharge constant voltage circuit 5, supplied to the light emitter 4 through the light emission pattern control circuit 8 which is an 8-bit microcomputer, and stored in the light emission pattern circuit 8. The light emitter 4 emits light in the light emission mode. Light emission by the illuminant 4 is performed only when it is detected by the day / night discrimination circuit 7 that it is nighttime. When the day / night discrimination circuit 7 detects that the ambient illuminance is below a certain level, the light emission from the discharge constant voltage circuit 5 occurs. When power is supplied to the pattern control circuit 8 and the illuminant 4 emits light, and the ambient illuminance exceeds a certain level, it is detected that it is daytime, and the supply of power to the light emission pattern control circuit 8 is stopped.

  FIG. 2 is a longitudinal sectional view showing an embodiment of a self-luminous road fence according to the present invention. The self-luminous road fence has a solar cell 1, a power storage means 2, and a control device 11 housed in a main body 10 embedded in a road surface G, and a maximum power point tracking circuit 3 and a discharge constant voltage circuit 5 in the control device 11. A day / night discrimination circuit 7 and a light emission pattern circuit 8 are provided. The upper surface of the main body 10 is a light-emitting diode that is blocked by a transparent synthetic resin lens body 20 so as not to prevent light from entering the solar cell 1 and is fitted into the lower surface of the lens body 20. The light emitted from the light emitting body 4 is refracted by the lens body 20 and is emitted at a slight angle with the road surface G to the outside.

  The effects relating to the efficient power storage to the power storage means in the self-luminous road fence according to the present invention will be described based on the following examples.

  The storage means is connected to the solar cell, the state of charge of the storage means from sunrise is measured for 75 minutes, and the result is shown in FIG. In FIG. 3, the output voltage of the power storage means in the self-light-emitting road fence according to the present invention is indicated by α, and the output voltage from the maximum power point tracking circuit is indicated by d. Further, when the maximum power point tracking circuit is not used, the output voltage of the power storage means is indicated by β, and the solar battery voltage in a state where the solar battery and the power storage means are connected is indicated by b.

  Comparing the voltage α and the voltage β, the voltage β is clearly higher until about 15 minutes after the maximum power point tracking circuit is unstable, but the voltage α increases after about 20 minutes after the stable operation. Since the voltage α exceeds 30 minutes later and the voltage difference ΔE after 75 minutes is about 0.1 V, the energy from sunlight is high in places with little sunlight such as urban areas and mountain areas. It is clearly shown that it can be used efficiently. In the present embodiment, the maximum power point tracking circuit is canceled 63 minutes after the output voltage of the power storage means exceeds the output voltage from the maximum power point tracking circuit.

It is a circuit block diagram in one embodiment of a self-luminous roadway concerning the present invention. It is a longitudinal cross-sectional view which shows one Embodiment of the self-light-emitting road fence concerning this invention. It is a graph which compares the electrical storage state of what used the maximum electric power point tracking circuit in a self-light-emitting type roadside, and what is not used.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solar cell 2 Power storage means 3 Maximum power point tracking circuit 4 Luminescent body

Claims (1)

Power storage from a solar cell to a power storage means, comprising a solar cell, power storage means for storing power generated by the solar battery, a light emitter, and a control circuit for controlling the power supplied from the power storage means to cause the light emitter to emit light Is performed via a maximum power point tracking circuit, and the maximum power point tracking circuit is configured to output a maximum power point when the output voltage becomes lower than the solar cell voltage in a state where the solar cell and the storage means are connected. A self-luminous road fence characterized in that the intervention of the following circuit is canceled .

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