SuperFast Rechargable Battery Using GoldCap Capacitors
When compared to conventional disposable or rechargeable batteries, GoldCap capacitors offer a very rapid charging while delivering a high peak output current which makes them an interesting alternative power source.
Capacitors offer an interesting alternative power storage device which can retain their charge for years while being charged very quickly. A capacitor can handle a very high peak current for both charging and discharging and has a very low self-discharge characteristic compared to rechargeable cells. SuperCaps have huge storage capacity measured in farads rather than microfarads although they are small outline capacitors.
The maximum supply/operating voltage of SuperCaps is 2.3V and can be increased up to a more useful 9V using a voltage multiplier in the form of a switching voltage regulator. To ensure that the capacitor retains its charge over time, a small switch or jumper is fitted to the circuit. The capacitor can be recharged from a wide range of voltage sources while protecting the capacitor from over-voltage with the use of an LM317T voltage regulator. The IC has built-in over-temperature and over-current protection.
A standard mains adapter is used to charge the circuit where the input current of 1A is limited by the internal resistance of the adapter. This makes the capacitor to be fully charged in 20s. The output is regulated by a voltage reference using a reverse biased transistor to act as a Zener diode. A small ferrite coil or choke is contained in a switching regulator for the rest of the circuit.
Rest of the Project
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