Patent ID: 9042127
Filing Date: 2015-05-26
Classification: H02M,H05B,Y02B

Abstract:
1. A method for controlling a switching operation of a switching power converter that comprises a semiconductor switch coupled in series to an inductor, the switching power converter consuming an input current from a power supply and providing an output current to a load, wherein the method comprises in each switching cycle: detecting a switch-on time instant for the semiconductor switch; closing the semiconductor switch thus enabling, at the detected switch-on time instant, the input current passing through the semiconductor switch; opening the semiconductor switch after a desired on-time, during which an input current rises from zero to a peak value, has passed; detecting a time interval, in which an instantaneous output current is not zero; obtaining a first value that represents the peak of the input current during the on-time; generating a first signal which has the first value during the detected time interval and is zero otherwise; averaging the first signal thus providing an averaged signal being an estimation of an average output current; and adjusting the desired on-time such that the averaged first signal approximately matches a pre-defined target value.