Technical FAQs 4

How do you charge a super capacitor?

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.

Can a supercapacitor charge more than rated voltage?

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.

How fast can a supercapacitor be charged?

The charging time depends on the capacitance value and the charging current. Generally, supercapacitors can be charged much faster than batteries, typically in seconds to minutes. 2. What is the maximum voltage a supercapacitor can be charged to?

Why does a super capacitor charge at a constant voltage?

Eventually, the super capacitor voltage, and therefore the charging circuit’s operating efficiency, increases so the capacitor charges at the desired constant (fast or max) charge current, ICHG, until it reaches and remains at constant voltage (CV) regulation voltage, VREG.

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