SEPIC converter passive components design

This paper presents a novel method for the design of passive components for battery powered SEPIC dc-dc switching regulators. The method is based on use of Acceptability Boundary Regions (ABR), which determine an area, in the space of parameters, corresponding to commercial components which ensure acceptable voltage ripples, fulfillment of maximum allowed power dissipation, and non pulsating source current absorption. The effectiveness of this technique is strengthened by a practical method to assign a loss budget distribution among passive components. It is shown that the new approach allows to figure out most convenient design solutions without making preliminary assumptions of inductors current ripples, but rather considering them like an optimization parameter.