This letter presents a favorable effect of the input filter on the stability of a filter‐converter system, which employs a cascade configuration of a voltage‐mode controlled buck converter and a third‐order input filter. Such an effect can enlarge the stable region of the stand‐alone buck converter when appropriately selecting the damping resistor of the input filter. Effectively, the frequency‐domain model based on the extra element theory is used to analyze and illustrate the input filter interaction regarding this favorable effect. Our work provides a supplementary view for engineers to deal with input filter interaction.
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Li et al. (2007) studied this question.
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