One aspect of this disclosure relates to an apparatus for providing a selective capacitance. An embodiment of the apparatus includes a first and second capacitor in a stack, and a switching circuit connected between the first and second capacitors. The switching circuit has at least two states, and is...http://www.google.de/patents/US8170662?utm_source=gb-gplus-sharePatent US8170662 - Method and apparatus for charging partitioned capacitors
