Patent ID: 7567070
Filing Date: 2009-07-28
Classification: H02M

Abstract:
1. A power supply regulator, comprising: a comparator having first and second inputs and an output, the first input of the comparator adapted to sense a current flow through a switch, the second input of the comparator adapted to sense a variable current limit value; and a controller coupled to the output of the comparator and to the switch to control switching of the switch to regulate an output of a power supply in response a feedback signal, wherein the controller disables the switch if the sensed current flow through the switch is greater than the sensed variable current limit value, wherein the variable current limit value is set to a first variable current limit value by the controller in response to an input line voltage of the power supply if there is not an over current condition during a first switching cycle that occurs after a skipped switching cycle of the switch, and wherein the variable current limit value is set to a second variable current limit value by the controller in response to the input line voltage if there is the over current condition during the first switching cycle that occurs after the skipped switching cycle.