You can directly use a DC voltage regulator with constant voltage and current limiting to charge the supercapacitor, which is the simplest and most convenient.
1. Fast charging stage: When the battery can accept the maximum power, tracking the maximum power point of the solar cell is used to charge the battery. When the voltage across the battery reaches the conversion threshold, it enters the overcharge phase.
2 Overcharge stage: Use constant voltage charging method to give the battery a higher constant voltage and detect the charging current at the same time. When the charging current drops below the conversion threshold, the battery is considered fully charged and the charging circuit switches to the floating charge phase.
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