Application of Solar Cell in Charger

Integrated amorphous silicon solar cells and rechargeable, composed of amorphous silicon solar power batteries charger has begun to practical. Sunny day, put the charger in direct sunlight for about four hours, rechargeable nickel-cadmium battery that is almost full charge. In addition the charger at the output terminal with a dedicated wire, can be directly for other machines of electricity Cool, can also be in the charge of nickel-cadmium batteries for backup power.

The amorphous silicon solar power battery charger consists of amorphous silicon solar cells and chassis composition, the machine behind the installation of removable nickel-cadmium batteries.If the ambient temperature rises 3, the capacity of nickel-cadmium batteries will become smaller, so The nickel-cadmium battery is designed to be mounted on the back of a charger that is not exposed to direct sunlight. Circuit Composition As shown in Figure 8-5, the integrated amorphous silicon solar cell is connected to the nickel-cadmium battery through the anti-backflow diode.The design of the amorphous silicon solar battery charger requires charging from the nickel cadmium battery capacity and charging time Current.

Here to choose a single type of nickel-cadmium battery (capacity 450mAh) as the secondary battery charger, and consider the two lifePo4 batteries in series, in order to make the battery charge 4-6h a day, the charging electric Taki must be 10mA, sunny, In the 100mW / cm2 light intensity of the charge, the two series of nickel-cadmium batteries in the required charge voltage of 3V, anti-retrograde diode voltage drop of 0.7V, another assumption in 100mW / cm2 light intensity of solar cells under the most The operating voltage is 0.6 V, the current is 12mA / cm2, the series of series is 3.7 / 0.6 = 6.1 is required to use seven series solar cells, solar cells, the effective area of 100/12 = 8,3cm2.

The charging current is 0.22c, which meets the charging current requirement for solar cells as described in Section 7.5. In the integrated amorphous-Gui solar battery charger shown in Figure 8-3, the solar cell is in a lump On the bottom by the two groups of seven cells in series, through the switch can be string, parallel, to make it on four or two nickel-cadmium batteries. Figure 8-6 shows the charging characteristics of the amorphous silicon solar battery charger in our country (Japan> summer outdoor sunny day, as can be seen from the figure, the lifePo4 battery = in the sun can fully charge.

The charging current is maximized with the amorphous silicon solar cell at right angles to the direction of the sunlight, and becomes smaller as the sunlight is tilted. Therefore, in order to charge more efficiently, the lifePo4 battery should be as long as possible with the sunlight The angle of incidence of sunlight varies with time over time and also varies with latitude and season, since the earth's axis of rotation is inclined by 23 ° 30 'relative to the axis of the earth's orbit around the sun Therefore, the charger should be placed in the vernal equinox, equinox should be the same latitude, in the summer solstice should be latitude of a 23 °30), in the winter solstice should be (latitude 10 23 ° 30). Is the actual charger circuit diagram.

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