As the use of standard coupled inductors has grown, Coilcraft datasheets now provide application-specific characterizations to help designers select the best-suited inductor.
#WHAT IS TYPICAL COUPLING COEFFICIENT FOR A TOROID SERIES#
You may also connect them in series to achieve a higher inductance or for use as a tapped inductor. The windings may be connected to circuits separately for use as isolation transformers or as common mode chokes. You can connect coupled inductor windings in different configurations to serve different purposes. The loosely coupled windings (K ≈ 0.8) improve SEPIC efficiency by reducing circulating current and still provide twice the ripple current reduction of separate inductors. In fact, Coilcraft's MSC1278 Series of coupled inductors is designed with high leakage inductance for use in certain SEPIC applications. High-performance designs like Coilcraft's LPD and LPD-V families are able to provide the desired coupling factor while also providing a high measure of voltage isolation between windings.Ĭlose coupling may not be optimal for all applications. For both transformers and coupled inductors, the efficacy of the winding coupling, expressed as coupling coefficient k, depends on the core material properties as well as the physical arrangement of the windings and core.Ĭommon to transformers and coupled inductors is the fact that close coupling between the windings (k > 0.9) results in low leakage inductance and generally provides the most efficient energy transfer and widest usable frequency bandwidth. Both may have either a 1:1 or 1:N turns ratio and have similar winding-core arrangements, and they may even "look the same." Actually, the most appropriate name depends on the intended application.Ĭoupled inductors and flyback transformers both use cores to store energy received from a winding and then transfer that energy to the other winding. There is often little or no physical difference between what one engineer calls a coupled inductor and another calls a transformer. What is the difference between a coupled inductor and a transformer? Typical circuits using 1:1 COUPLED INDUCTORS
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