Patent ID: 7701685
Filing Date: 2010-04-20
Classification: H02M,H03K

Abstract:
1. An apparatus for providing over-current protection for a pulse-width modulator controlled power supply that operates on switching frames, comprising: first logic circuitry for generating a primary interrupt indicating a discrete event within a given switching frame wherein a detected output current is greater than a threshold current such that only a single primary interrupt will be generated during a given switching frame regardless of the number of discrete events occurring during such given switching frame and not requiring the discrete event to be continuous; second logic circuitry for generating a secondary interrupt responsive to occurrence of the discrete event generating the primary interrupt from the first logic circuitry for a predetermined number of sequential switching frames such that only one primary interrupt occurs during each of the predetermined number of sequential switching frames; and a controller for modifying an operation of the pulse-width modulator in response to the generation of the secondary interrupt to provide over-current protection.