A Delay-Stabilized Controller for Buck Converter With Enhanced Stability and Noise Immunity

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Abstract
In this article, a new controller for a dc/dc buck converter is introduced, with a key feature that it does not rely on a current sensor, which minimizes sensitivity to sensor errors, including sensor noise and offsets. This is made possible by using a delayed, positive feedback term of the output voltage. The controller achieves stabilization without the need for current feedback during challenging situations of powering constant power loads and/or reverse power flow, i.e., the boost mode, operation. This article includes theoretical analyses using both approximate and precise methods, a step-by-step algorithm for designing controller parameters, and comprehensive performance evaluations through simulations and laboratory experiments, demonstrating its efficacy. This article concludes that the proposed method has robust stability and high noise immunity and is a suitable choice to be employed in extreme practical conditions.

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