Patent ID: 7394231
Filing Date: 2008-07-01
Classification: H02M

Abstract:
1. A regulator circuit for step-up and step-down operation having an input connectable to a power source and an output connectable to a load, the regulator circuit comprising: an inductor; a first controlled switch connected between a first inductor terminal and an input terminal; a second controlled switch connected between the first inductor terminal and a common connection; a third controlled switch connected between the second inductor terminal and the common connection; a fourth controlled switch connected between the second inductor terminal and an output terminal; and a control circuit coupled to a source of constant frequency clock cycles; wherein the control circuit is responsive to receipt of each clock pulse of the clock source to activate one of the controlled switches and deactivate another of the controlled switches and is responsive to current in the inductor attaining a current threshold during each clock cycle to reverse the switch activation and deactivation states for the remainder of the clock cycle.