Solar charger circuit
Source: InternetPublisher:newlandmark Keywords: Charger circuit solar charger LED voltage drop Updated: 2020/03/23
Circuit working principle: LED is a high-brightness light-emitting diode used for lighting and power display
. R is the current limiting resistor, its resistance = board voltage - LED forward voltage drop /light-
emitting diode current. VD1 and VD2 are step-down diodes. Generally, the forward voltage drop of silicon tubes is 0.6 V.
The two lithium batteries are equipped with overcharge and over-discharge protection circuits, and are switched to parallel or series connection
via S5 and S3 and S4. JF switch combination can output 2.5 V, 3.4 V, 4V, 6.5 V,
7.8 V, 8v (sufficient state) voltage.
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