A Novel Fully Soft‐Switching DC–DC High Step‐Up Converter With Integrated Auxiliary Circuit

ABSTRACT This paper introduces a new high step‐up converter based on an interleaved structure. The topology achieves high efficiency by eliminating switching losses and reducing conduction losses. Fully soft switching condition is provided for all semiconductor devices. An auxiliary circuit is applied to ensure zero‐voltage switching for the main switches. Moreover, the auxiliary switch operates under zero current switching (ZCS) with the help of the leakage inductor. Additionally, all diodes turn off under ZCS, eliminating their reverse recovery issues. The recovered energy from the leakage inductor further enhances efficiency. Furthermore, the switches' voltage stress are clamped well below the output voltage, allowing the use of switches with low . The topology also features continuous input current with low ripple. The operation principles, theoretical analysis and a comparison with other similar topologies are represented. To verify the accuracy of the suggested converter, experimental results of 30 to 400 V are provided.