A common rule of thumb is to limit the charging current to the supercapacitor’s rated current. The charging voltage should not exceed the supercapacitor’s rated voltage, to prevent overvoltage damage. A voltage regulation circuit is necessary.
Most super capacitors (supercaps) can be discharged down to 0 V and recharged to their maximum voltage with the manufacturer recommended charge current. A simple voltage regulating LED driver with constant current, usually regulated by sensing a low side, series current sense resistor, then a voltage clamp can be used to charge a super capacitor.
The charging current should be within the safe operating range specified by the supercapacitor manufacturer. Exceeding the maximum charging current can lead to excessive heat generation, reduced lifespan, and potential damage to the supercapacitor. Similarly, the charging voltage should not exceed the rated voltage of the supercapacitor.
1) You must never charge past the capacitor voltage rating. If you have a 2.5v super capacitor, you must NEVER charge it at a higher voltage. If you do, you risk damaging the integrity of the capacitor, or worse, an explosion. Personally, I never charge past 80-90% of the rated charge.
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