Small signal model for Boost Phase-shifted Full Bridge converter in high voltage application

Boost Phase-shifted (PS) Full-Bridge (FB) converter is a typical converter in high voltage application. Due to the requirement of high voltage insulator, its transformer is often designed with more leakage inductor and inter-layer capacitor. Considering leakage inductor and inter-layer capacitor's effect, accurate model of Boost PS FB converter is established. The difference between this model and the conventional model is analyzed. Based on this model, the closed-loop small signal model with average current-mode control is also given. The experimental results on a 530V/15kV, 5kW prototype proved the theoretical analysis.

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