Solar voltage stabilizer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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The solar voltage regulator is shown in the diagram shown in the figure.
Ionistors C2, C3 serve as energy buffers for autonomous operation in poor lighting conditions. In bright light, they are recharged from two solar panels connected in parallel GB1 and GB2 with a nominal voltage of 4,8 V at a load current of 10 mA each. The Schottky diode VD1 prevents the ionistors from discharging through the internal resistance of the solar panels.
Since at idle the voltage of the solar battery can significantly exceed the nominal voltage, reaching 6 ... 9 V, it is necessary to protect both low-voltage ionistors and powered equipment from it. This is done using two identical voltage limiter nodes on transistors VT1 and VT2.
Two limiters are required - separately for each ionistor. Otherwise, as a result of a significant spread in capacitance and leakage current, the voltage will be unevenly distributed between them and on one of the ionistors will exceed the allowable one.
The voltage equality across the ionistors is achieved by adjusting the resistors R3 and R4. If it still remains large than the permissible one, you can leave two diodes in the VD2-VD4 and VD5-VD7 chains or replace one of them with Schottky diodes.
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