Charger from solar panels. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Alternative energy sources
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This charger uses 12V solar panel and LM317 adjustable voltage regulator. The solar array contains solar panels, each of which produces a voltage of 1.2 volts. As a result, 12 V DC is obtained from the solar panels to charge the batteries.
A little about the charger. The current from the solar cells, through the diode D1, is supplied to the voltage regulator LM317. The ADJ (regulation) pin allows you to adjust the output current and voltage. Charging requires a voltage of 9 V, which is obtained by adjusting the variable resistor VR. Resistor R3 limits the charge current, and diode D2 serves to prevent battery discharge.
Transistor T1 and zener diode ZD serve to turn off charging after the battery is fully charged. When the battery voltage exceeds 6.8V, the zener diode opens and current flows to the base of transistor T1, which also opens and current from LM317 now passes through it to the minus of the power supply.
Author: Koltykov A.V.; Publication: cxem.net
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