I. Introduction
Nowadays, there are many types of topologies using multi-winding transformers, but most control strategies focus on controlling the switching frequency and bridge arm phase shift [1]–[2]. The leakage inductance of the transformer, which is part of the resonant inductance, plays an important role in influencing the voltage gain. If the leakage inductance between different windings is inconsistent, the voltage gain on the different input and output sides will deviate significantly with varying load sizes. Thus, multi-winding transformers have strict requirements for balancing leakage inductance between different primary and secondary windings.