Patent ID: 7095218
Filing Date: 2006-08-22
Classification: H02M,Y02B

Abstract:
1. A method for detecting a variation in a current supplied to a load that receives variable DC power via a first end of an inductor which is included in a synchronous rectification DC-DC converter, the DC-DC converter also including a first switching element connected to one of two terminals of a DC input power source and a second switching element connected to the other terminal, the first and second switching elements being connected to a second end of the inductor at a connecting point, the method comprising the steps of: turning the first and second switching elements on and off alternately in a prescribed switching period; filtering a voltage at the connecting point of the first and second switching elements with the second end of the inductor to obtain a filtered voltage; and determining an average output current of the DC-DC converter, the determining step comprising finding the difference between the filtered voltage and the voltage at the first end of the inductor.