The invention relates to a control means and method for a transistor switch circuit controlling a power supply circuit for providing electric power to a load, comprising: a power supply stage having an LC circuit with an inductor, and a control stage having an estimation of the inductor current as a...http://www.google.de/patents/US7098630?utm_source=gb-gplus-sharePatent US7098630 - Control means and methods for a transistor switch circuit
