Achieving Approximately Zero Ripples in Input Current of Coupled SIDO Boost Converter

This article focuses on the coupled inductor single input dual output (CI-SIDO) boost converter topology. The CI-SIDO boost converter can be used in many practical applications, such as electric vehicles, renewable energy systems, and portable electronic devices. Several applications, such as battery charging, fuel cells, photovoltaic systems, and ultracapacitors, require ripple-free currents, as the lifetime of sources in these applications gets reduced by higher current ripples. However, there is no method in the existing literature to obtain a zero-ripple input current in the CI-SIDO boost converter. This article proposes an approach to design a CI-SIDO boost converter such that the ripple in input current is either zero or less than the maximum specified ripple limit. The analytical proofs of the design method are presented, and the usability analysis is evaluated by taking practical design examples. The effect of variations in the input voltage, CI parameters, and closed-loop control on the proposed design method is analyzed. The proposed design method is verified in experiments by laboratory prototype and in LTspice simulations.