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.
The article from : http://www.storagebattery-factory.com/news/application-of-solar-cell-in-charger.html
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