The Optimal Design of Coupled Inductor in Interleaving BDC

The working mode and equivalent inductance of the three-phase Buck+Boost interleaving and magnetically integrated bidirectional DC/DC converter(BDC) are studied when its duty circle is changed from 0~1,under Buck mode.The relationship among equivalent inductance,steady state current ripple,transient current response speed,duty cycle and coupling coefficient is studied deeply.At last,the optimal design formula is given.The theory is verified by simulation and experiment.