JPH10189262A - Charged type illuminating method and device using solar battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charged type illumination method and device in which a low voltage range of a storage battery is applicable to elongate a possible lighting time, and in which lamp efficiency is also improved. SOLUTION: In a charged type illuminating method using a solar battery in which power generated by a solar battery 16 is charged to a storage battery 20, so electricity charged in the storage battery 20 is converted by an inverter 18 to AC at night for lighting a fluorescent lamp 21 provided with a stabilizer, output of the inverter 18 in starting the fluorescent lamp 21 is set to be AC of a low frequency and a high duty ratio, and the output of the inverter 18 after lighting the fluorescent lamp is set to be that of a high frequency and a low duty ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rechargeable lighting method using a solar cell which can be used for street lights and the like, and an apparatus therefor.

[0002]

2. Description of the Related Art Fluorescent lamps are widely used as street lamps for outdoor use because of their low power consumption and long operating life. They are usually arranged on telephone poles and lit at night using a commercial power supply. It has become. However, when using a commercial power supply, it is necessary to perform wiring work to the place where the power supply exists, and it is difficult to install it in a place without the power supply. A rechargeable lighting device using a solar cell that turns on a fluorescent lamp by operating an inverter using the storage battery as a power source at night has been used.

[0003]

However, the conventional fluorescent lamp has a negative characteristic as shown in FIG.
When a glow lamp 11 and a reactor 12 which is an example of a ballast are connected in series to the fluorescent lamp 10 and are turned on, current flows through the filaments 13 and 14 of the fluorescent lamp 10 through the reactor 12 and the glow lamp 11,
The filaments 13 and 14 are heated.
Therefore, when the frequency of the power supplied from the inverter is close to the commercial frequency (50 Hz or 60 Hz), current flows under substantially the same conditions as when using the commercial frequency. In the case of a commercial power supply, the fluctuation range of the power supply voltage is within ± 10%, so that it can be stably lit. However, in the case of a storage battery, its use range is as large as about ± 16%, and the voltage of the storage battery has dropped. In this case, the output voltage of the inverter also decreases, and the start current of the fluorescent lamp 10 decreases, which causes a start failure. In this case, the life of the fluorescent lamp 10 is shortened because the glow lamp 11 tries to turn on the fluorescent lamp continuously. Further, in the case of the glow starter, the life of the glow lamp 11 is shortened. Further, when the voltage of the storage battery is high, there is a problem that the lamp current is increased more than necessary and power consumption is increased. The present invention has been made in view of such circumstances, and provides a rechargeable lighting method and a device using a solar cell that can be used in an area where the voltage of a storage battery is low and that can be turned on for a longer time and that also improves lamp efficiency. The purpose is to do.

[0004]

According to the present invention, there is provided a semiconductor device comprising:
The rechargeable lighting method using a solar cell according to the present invention is to charge a storage battery with power generated by the solar cell, and convert the electricity charged in the storage battery by an inverter to AC at night, and a fluorescent lamp with a ballast. A rechargeable lighting method using a solar cell that is turned on, and when starting the fluorescent lamp,
The output of the inverter is a low frequency alternating current with a high duty ratio, and after the fluorescent lamp is turned on, the output of the inverter is a high frequency alternating current with a low duty ratio. Also,
A rechargeable lighting device using a solar battery according to claim 2 includes a solar battery, a storage battery for charging power generated by the solar battery, an inverter using the storage battery as a power source, and a ballast connected to the inverter. In a rechargeable lighting device using a solar cell having a fluorescent lamp, the control device of the inverter, when the fluorescent lamp is turned on, its output is low frequency and high duty ratio AC, and after the fluorescent lamp is turned on. And output control means for outputting an alternating current with a high frequency and a low duty ratio. In the above,
The duty ratio refers to the ratio of the actual energizing time to the total energizing time in the output waveform of the inverter.

[0005] In the rechargeable lighting method using the solar cell according to the first aspect and the rechargeable lighting apparatus using the solar cell according to the second aspect, when the fluorescent lamp with the ballast is turned on, the output of the inverter is started at the time of starting. It has a low frequency and a high duty ratio. Therefore, the ballast has a low impedance at low frequencies, so that a relatively large current flows through the filament of the fluorescent lamp and starts even when the voltage of the storage battery is relatively low. Then, after starting, an alternating current having a high frequency and a low duty ratio is output, so that the actual current flowing through the fluorescent lamp is suppressed, and the efficiency is improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is an explanatory diagram of a rechargeable lighting device using a solar cell according to one embodiment of the present invention, and FIG. 2 is an output waveform diagram of an inverter.

As shown in FIG. 1, a rechargeable lighting device 15 using a solar cell according to an embodiment of the present invention includes a solar cell (solar panel) 16 and a charge control circuit 17 connected to the solar cell. And a control device 19 including an inverter 18, a storage battery 20 for storing electric energy of the solar cell 16, and a fluorescent lamp 2 illuminated by the inverter 18.
And 1. Hereinafter, these will be described in detail.

As the solar cell 16, a commercially available solar cell having a power consumption of about two to three times the power consumption of the fluorescent lamp 21 serving as a load is used. The charge control circuit 17 is a control circuit for supplying electricity from the solar battery 16 to the storage battery 20. When the electromotive force of the solar battery 16 is smaller than the electromotive force of the storage battery 20, a current is supplied from the storage battery 20 to the solar battery 16. It has a reverse current prevention element that does not flow, detects the charging voltage of the storage battery 20, and when the storage battery 20 has an electromotive force of a certain level or more, the current from the solar cell 16 does not flow to the storage battery 20, The storage battery 20 can be prevented from being overcharged.

The inverter 18 has an illuminance sensor 2
The DC power stored in the storage battery 20 is converted into AC and supplied to the fluorescent lamp 21 when the ambient light is detected and it is determined that night has passed. The inverter 18 is a bridge-type inverter using a well-known transistor, and controls the current supplied to the base of the transistor connected in series with the load.
An alternating current having a waveform as shown in FIG. Further, the inverter 18 is provided with a current detection circuit for detecting a load current, and detects a large current when the fluorescent lamp 21 is started and a relatively small current when the fluorescent lamp 21 is discharged. The lighting state can be identified.

When the fluorescent lamp 21 is started (that is, when the fluorescent lamp 21 is turned on), the load current becomes a low frequency, high duty ratio current. Output control means is provided for controlling the base current of the transistor so that the current becomes a ratio current. The circuit configuration of this output control means is as follows:
For example, there is a known method such as dividing the counter to generate a signal at an appropriate time and supplying the signal to a flip-flop circuit to control the on / off state.

FIG. 2 shows a control waveform of the load current used in the rechargeable lighting device 15 using the solar cell according to this embodiment. FIG. 2A shows a waveform when the fluorescent lamp 21 is started.
(B) shows a waveform when the fluorescent lamp 21 is turned on. That is, in (A), the frequency is 45 Hz, and the duty ratio, which is the energizing time with respect to the entire time, is 100% (90 to 1).
00% is preferable), which is a voltage waveform when the fluorescent lamp 21 is started. As a result, the impedance of the ballast 12 (see FIG. 3) composed of the reactor can be reduced, and the current flowing through the filaments 13 and 14 can be increased. , 14 can be heated and the lighting of the fluorescent lamp 10 can be promoted.

Next, when the fluorescent lamp 21 is turned on, a decrease in the load current is detected, and as shown in FIG.
Hz, the duty ratio drops to about 75% (60 to 80
% Is preferable), so that the actual load current is reduced. This is because the fluorescent lamp is a discharge lamp, so its current-voltage curve has a negative characteristic or a drooping characteristic,
Although the current increases, the illuminance of the fluorescent lamp is not proportional to the increase in the current, that is, the supplied power. Therefore, it is efficient to obtain an appropriate illuminance (luminous intensity) with a minimum current. Is the reason.

Therefore, in the rechargeable lighting device 15 using this solar cell, the daytime power is generated by the solar cell 16 and the storage battery 20 is charged through the charging control circuit 17. Confirm that it is dark, and turn on inverter 18. When the fluorescent lamp 21 is started, the waveform of the inverter 18 is controlled so that the filament 13 and the waveform of FIG.
The heating of the lamp 14 is promoted to cause the discharge of the fluorescent lamp 10. When the fluorescent lamp 10 shifts to the main discharge, the load current decreases.
8 is as shown in FIG. 2 (B). As a result, the current is suppressed, so that the discharge life of the storage battery 20 is prolonged, and the storage battery 20 can be downsized and used for a long time.

In the above embodiment, the low frequency is set to 45 Hz and the high frequency is set to 90 Hz. However, at the low frequency, the fluorescent lamp can be started at a relatively low voltage (for example, 5 Hz).
5 to 30 Hz), and a high frequency is a frequency range in which the fluorescent lamp can be efficiently turned on (for example, 70 Hz to 150 Hz).
If so, another frequency may be used. Further, the control waveform of the inverter is a rectangular wave, but may be a sine wave or another waveform. In addition, when the rechargeable lighting device 15 using the solar cell is compared with a rechargeable lighting device using a solar cell that operates at a commercial frequency without converting the frequency according to the conventional example, the efficiency increases by 30 to 40%, It has been confirmed that the lighting time has been greatly increased.

[0015]

According to the rechargeable lighting method using the solar cell according to the first aspect and the rechargeable lighting apparatus using the solar cell according to the second aspect, as is clear from the above description, the efficiency of the fluorescent lamp is improved. did. In addition, since the fluorescent lamp can be turned on even at a lower voltage of the storage battery, the lighting time is greatly extended.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a rechargeable lighting device using a solar cell according to an embodiment of the present invention.

FIGS. 2A and 2B are output waveform diagrams of an inverter, wherein FIG. 2A shows a state when a fluorescent lamp is started and FIG.

FIG. 3 is an explanatory diagram of a fluorescent lamp.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 fluorescent lamp 11 glow lamp 12 ballast (reactor) 13 filament 14 filament 15 rechargeable lighting device using solar cell 16 solar cell (solar panel) 17 charging control circuit 18 inverter 19 controller 20 storage battery 21 fluorescent lamp 22 illuminance sensor

Claims (2)

[Claims] 1. A method of charging a storage battery with electric power generated by a solar battery, and converting the electricity charged in the storage battery by an inverter into AC at night to charge the storage battery with a solar cell that turns on a fluorescent lamp with a ballast. An illumination method, wherein when starting the fluorescent lamp, the output of the inverter is low frequency and high duty ratio alternating current, and after the fluorescent lamp is turned on, the output of the inverter is high frequency and low duty ratio alternating current. A rechargeable lighting method using a solar cell. 2. A solar cell comprising a solar cell, a storage battery for charging electric power generated by the solar cell, an inverter using the storage battery as a power source, and a fluorescent lamp with a ballast connected to the inverter. In the rechargeable lighting device, in the control device of the inverter, when the fluorescent lamp is turned on, its output is set to an alternating current having a low frequency and a high duty ratio, and after the fluorescent lamp is turned on, the output is changed to a high frequency and a low duty ratio. A rechargeable lighting device using a solar cell, wherein output control means for alternating current is provided.