Output Filter with Adaptive Damping for Interleaved Converters with Low Ripple and High Dynamics

Abstract

Interleaved DC-DC converters are used in a wide range of applications offering a high current rating combined with ripple cancellation. In these systems, the design of the output stage is of crucial importance since it not only influences the output ripple at steady state but also affects the dynamic performance of the system. In particular, by reducing the output filter, a higher dynamic performance can be achieved, making interleaved converters especially interesting for high performance sources, used for example in accelerators. In this paper, an adaptive output filter with variable impedance, suitable for a wide range of inductive loads (e.g. magnets), is proposed for interleaved converters with low ripple and high dynamic specifications. The proposed solution is compared with a conventional filter topology and its superiority is exhibited through analytical calculations and simulations.