Resonant inductor
The resonant inductor is the core component of LLC topology charging piles, which achieves precise resonant parameters (Lr=50 μ H ± 3%) through magnetic circuit symmetry design and air gap regulation. Adopting a layered and segmented winding process, the distributed capacitance is less than 10pF, combined with aluminum nitride substrate heat dissipation, and the temperature rise is controlled within 30K. The magnetic core is made of low loss MnZn ferrite (Bs ≥ 450mT), with a working frequency of 500kHz and a Q value greater than 150. The network composed of it and resonant capacitor (C=22nF) can achieve zero voltage switching (ZVS), reducing switching losses by 70%. Parameter matching needs to meet the soft switching condition of Cr/CoSs>5 and have a frequency offset tolerance of ± 20% to adapt to dynamic load regulation requirements.
