A driver apparatus

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An inductively powered device driver comprises a secondary winding to be coupled to a primary winding, a ferrite core formed of two separable parts 110, 120, and a permanent magnet 111, 112, 121, 123 attached to each part of the ferrite core. The two parts of the core are clamped together by the permanent magnets, thereby avoiding variation or degradation in the clamping force associated with the use of springs or mechanical mountings to fasten the core together. The permanent magnets are preferably separated from the ferrite core by an insulator 140, 141. A steel metal plate (150, Figure 4) may be positioned between the two parts of the ferrite core in the closed position. The permanent magnet preferably comprises a rare earth magnet, such as Neodymium (Nd), Samarium-Cobalt (SmCo) or Cerium (Ce). The driver may be placed along a power bus on a high frequency alternating current (HFAC) system to inductively couple power to an electrical device.