Longer charging time: Constant current charging typically takes longer to fully charge the supercapacitor compared to constant voltage charging. – Higher peak currents: The initial charging current can be high, especially when the supercapacitor is completely discharged, which may require proper current limiting and protection.
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.
In constant current charging, the supercapacitor is charged with a fixed current throughout the charging process. The charging circuit maintains a constant current by adjusting the voltage across the supercapacitor. The charging voltage increases linearly with time until it reaches the desired charging voltage.
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