JPH02152197A - Solar-cell type night traffic lighting system - Google Patents

Abstract

PURPOSE:To reduce power consumption of a secondary cell as possible by utilizing a low consumption type luminaire for performing a lighting operation only at the time of sensing a human body during night and using a side lighting technique. CONSTITUTION:A secondary cell E2 is charged by electric power generated in a solar cell E1. A charging/discharging control unit A controls charging of the electric power from the solar cell E1 to the secondary cell E2 or discharging of the electric power from the secondary cell E2. A human body sensor S, which is an ultrasonic sensor not required for large power consumption, is operated by day/night sensing only during the night. A lighting control unit C is provided with timers 1, 2. When lighting is not required after a predetermined night lighting time elapses, the timer 1 does not perform lighting of a luminaire even in the case of sensing a human body. Meanwhile, the night-only timer 2 performs lighting of the luminaire at the time of sensing a human body and automatically extinguishes the luminaire after a predetermined time elapses. Whether day or night is determined according to a generated voltage of the solar cell E1. During night, a low consumption type luminaire 1 provided with an uneven reflecting surface 3 held between light emitters 2 is used.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a solar powered night traffic lighting system using solar cells.

``Prior Art and Problems to be Solved by the Invention'' Although attempts have been made to reduce power consumption in nighttime traffic lighting systems, they are still not sufficient. As shown in FIG. 3, the illumination device is one in which light is projected directly onto the illumination surface 102 from the light emitters 101, and is determined as follows.

"Means and Effects for Solving the Problems" In view of the above circumstances, the present invention provides a nighttime traffic lighting system using solar cells, which performs lighting operation only when a human body is detected at night, and reduces consumption by side lighting. The power consumption of the secondary battery that charges the power of the solar cell using the lighting device is reduced as much as possible.

"Example" Figure 1 shows the solar battery-powered night traffic lighting system.

A solar cell E1, a secondary battery E2 that charges the power generated by the solar cell E1, a charge/discharge control unit A that controls charging and discharging of the secondary battery E2, a lighting device B that performs lighting operation, and a human body sensor. It consists of a lighting control section C that controls lighting operation using a sensor S and a timer T.

The secondary battery E2 is charged with the power generated by the solar battery E1. The charge/discharge control unit A controls the charging of the secondary battery E2 with the power from the solar cell E, or controls the discharging of the power from the secondary battery E2. In charge/discharge control of the secondary battery E2, the maximum current is specified for charging and the terminal voltage is controlled, and the discharge end voltage is specified for discharging.

The human body sensor S is an ultrasonic sensor with low power consumption and operates only at night due to day/night sensing.

The lighting control section C has a timer 1 and a timer 2. Timer 1 is a timer that does not turn on the lights even if it detects a human body after a certain period of time has elapsed and the lights are no longer needed. This is a night-time timer that automatically turns off the light when the time elapses. Daytime and nighttime are sensed by the voltage generated by the solar cell E, and lighting control is switched between daytime and nighttime.

As shown in FIG. 2, a low consumption lighting device 1 using side lighting to suppress power consumption of the lighting section has light emitters 2 on both sides.
2, and apply paint between the light emitters 2 to form the uneven reflective surface 3. The lighting power consumption is expressed as: In the present invention, as compared to the conventional one shown in FIG. 3, due to the presence of the uneven reflecting surface 3, the light reaching area of the light emitter is larger and the power consumption for illumination is reduced.

"Effects of the Invention" As described above, the present invention performs side lighting, thereby reducing power consumption of the lighting section. Also, a timer is provided to control the lighting time. In addition, a human body sensor is provided that operates the lighting only when a human body is detected, controls charging and discharging of the secondary voltage, and detects day and night using the voltage of the solar cell. Therefore, in the solar powered night transportation system, the power consumption of the secondary battery can be reduced as much as possible.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the solar battery type night traffic lighting system of the present invention;
FIG. 2 is a longitudinal cross-sectional view of a side illumination device, and FIG. 3 is a longitudinal cross-sectional view of a conventional illumination device. El...Solar cell E2...Secondary battery A...Charge/discharge control unit B...Lighting device S...Human body detection sensor T...Timer C...Lighting control unit

Claims (1)

[Claims] (1) A solar cell, a secondary battery that charges the power generated by the solar cell, a charge/discharge control unit that controls charging and discharging of the secondary battery, a lighting device that performs lighting operations, a human body detection sensor, and a timer. In a solar-powered night traffic lighting system consisting of a lighting control unit that controls lighting operations, the lighting operates only when a human body is detected at night, and uses a low-consumption lighting device with side lighting to reduce the power consumption of secondary batteries. A solar-powered night traffic lighting system characterized by minimizing the amount of