An AC adapter that allows a lower power rating while still providing the necessary power to a load which is substantially constant over a varying voltage range and to charge a discharged Ni-Cad battery in a desired time. The AC adapter regulates its output power to a maximum level just greater than the...http://www.google.com.au/patents/US5382893?utm_source=gb-gplus-sharePatent US5382893 - Maximum power regulated battery charger
