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The interleaved Boost resonant converter is a well-known topology for applications requiring high step-up ratios, such as photovoltaic (PV) applications. It features its step-up capability, low input current ripple, and soft-switching characteristics. Nevertheless, designing Boost inductors presents challenges. If the Boost inductance is too large, it results in a significant DC component in the inductor current, making it challenging to achieve soft switching on the low-voltage side. Conversely, if the Boost inductance is too small, it leads to a large peak-to-peak boost inductor current, increasing magnetic core losses. There is also a trade-off between boost inductors and magnetizing inductance, impacting conduction loss. This paper addresses these challenges by introducing an auxiliary inductor that facilitates full-range soft-switching. Although the auxiliary inductor will bring losses, it is possible to reduce the overall system loss based on the overall system loss. Additionally, the implementation of a quadruple rectifier reduces diode voltage stress, decreasing costs and diode losses. It also contributes to a low turn ratio transformer and reduced transformer size as well as losses. Finally, a 330W prototype operating with input voltage ranging from 44V to 66V and an output between 250V and 440V is presented to validate the proposed concept.
Zuo et al. (Sun,) studied this question.