Pulse Electronics Designing Coupled Inductors

Using a previously derived circuit model, coupled inductor designs can be optimized for best performance in multiphase power converters.

In the January issue of Power Electronics Technology, the operation and benefits of the coupled inductor multiphase (CIMP) topology were reviewed, and the equations for the output and phase-ripple currents were derived using a circuit model representation of the coupled inductor. In the circuit model, the coupled inductor is represented by a leakage inductance in each phase (LK), a magnetizing inductance (LM) and an ideal transformer with a 1-to-1 turns ratio.