High storage power chokes

All of these high storage power choke ranges use Hi-Flux powder cores. These are made from a nickel-iron alloy, which gives a much better hold-up of inductance with dc bias current - for instance 125u Hi-Flux core has a similar hold-up to 60u iron powder. This allows the use of a higher permaebility core, to give approximately twice the inductance of a similarly sized iron powder core. The higher ripple flux density that results is offset by a lower core loss, to allow the chokes to be used up to 50kHz or 100kHz, depending on the application. Although of inherently higher cost, a smaller sized core can be used, minimising the price penalty, and reducing the choke size.

High storage ranges

High energy storage chokes, with approximately twice the inductance of equivalent iron powder ranges. Multi-layer windings are used for optimum energy storage and low voltage drop. Used for compact SMPSU output chokes and emc chokes.

PFC power factor correction chokes, similar to the WH range but with inductances optimised for pfc chokes operating to c50kHz. Multi-layer windings are used to give high energy storage, as choke self-capacitance is not a prime consideration in this frequency range. Used for compact low power and medium power pfc chokes.