Method and related device for charging at the same voltage two or more capacitors connected in series

摘要

A pump capacitor (Cpump) or alternatively an energy storing inductor (Coil) is charged by coupling it to a voltage source (VIN), thereafter the charged pump capacitor (Cpump) or energy storing inductor (Coil) is connected in parallel to one of said capacitors or capacitance cell to be charged. The sequence of different connections of the pump capacitor (Cpump) or inductor (Coil) to the charge voltage source (VIN) and to the selected one of the capacitors of the series is actuated through a plurality of coordinately controlled switches (A,B,C,D,E) that establish distinct current circulation paths, according to a switched-capacitor or switched inductor technique, all driven by respective periodic control signals, generated from a master clock signal. In charging all the capacitance cells substantially at the same time, at every charge/discharge cycle it may be decided which capacitance or cell is going to be charged by connecting in parallel thereto the charged pump capacitor (Cpump) or charged inductor (Coil), depending on the voltages detected on each capacitance cell of a super capacitor.