Patent ID: 8018694
Filing Date: 2011-09-13
Classification: H02M,Y02B

Abstract:
1. A method for over-current protection in a power converter system, the method comprising: switching one or more transistors in the power converter system at a primary frequency to cause current to flow through an inductor of the power converter system; comparing a feedback voltage which is indicative of output voltage of the power converter system against a reference value and outputting a voltage at a compensation node in response; monitoring the voltage at the compensation node, wherein the voltage at the compensation node is indicative of current flowing through the inductor of the power converter system; if the voltage at the compensation node reaches a predetermined value and the feedback voltage is fractionally lower than the reference value, clamping the voltage at the compensation node so that the switching of the one or more transistors ceases, thus allowing the current flowing through the inductor to decay; when the current flowing through the inductor has decayed to a predetermined level, allowing the switching of the one or more transistors to resume.