三相阶梯式耦合电感综合建模和多目标优化OA

Aimed at the difficulties in improving the efficiency and power density in interleaved boost converters for electric vehicle onboard power supplies,which are caused by high power demands and stringent spatial constraints,a three-phase coupled inductor with ladder magnetic core and the corresponding multi-objective optimization design meth-od are proposed.First,a three-phase coupled inductor with ladder magnetic core is put forward to enhance the spatial utilization.A mathematical model of the coupled inductor is developed,and distinct magnetic reluctance models are uti-lized to separately compute the DC and AC magnetic flux components,thereby overcoming the limitations of complexity and low accuracy associated with the conventional calculation approaches for magnetic flux.Second,an optimization scheme for this mathematical model is established with an objective of minimizing the inductor volume while incorporat-ing constraints such as efficiency,magnetic flux density and input current ripple.This enables the simultaneous optimi-zation of converter efficiency and coupled inductor volume.Through the analysis of the Pareto front between volume and efficiency,the superior power density performance of the proposed structure is demonstrated in comparison with the vol-ume of common core structures.Finally,a 30 kW experimental prototype was constructed,and experimental results in-dicate that the proposed three-phase coupled inductor with ladder magnetic core can effectively enhance both the power density and efficiency of the interleaved Boost converter under the optimization scheme,making it suitable for electric vehicle onboard power supplies.