Closed form analysis of N-cell interleaved two-level DC-DC converters: The DC bus capacitor current stress

Parallel interleaved power converters are used in application that require high power capability, minimization of size, cost and losses of the passive components and improvement of the control performances. Interleaved dc-dc converter is an attractive solution widely used in various power conversion applications, such as voltage regulation modules (VRM), renewable applications, automotive and traction applications, power factor correctors (PFC) and power supplies. Apart some general analysis of interleaved converters presented in literature, there is not a single publication that gives detailed analysis and closed form equation of the dc bus capacitor current stress in case of N-cell interleaved dc-dc converter. In this paper, a detailed analysis of N-cell interleaved dc-dc converters with focus on the dc bus capacitor current stress is presented and a closed form equation of the dc bus capacitor RMS current is developed.