High flux and low loss cores

6 November 2002 Power Electronics / Power Management

Molypermalloy powder (MPP) cores are a distributive air gap type and have many outstanding characteristics - high resistivity, low hysteresis and eddy current losses and excellent inductance stability under both DC and AC conditions.

MPP cores from magnetics are ideal where high Q, high inductance stability, and moderate coil costs are required. Below 300 kHz, they are preferred for high Q filters, loading coils, resonant circuits, and RFI filters. Made in 10 permeabilities (14 to 550) with guaranteed inductance limits of ±8%, sizes range in IDs from 1,81 mm to 48,3 mm and ODs from 3,6 mm to 78,7 mm. Standard cores include both unstabilised and temperature stabilised (-65 to +125°C) types.

High Flux powder cores, made in six permeabilities (60 to 160), have a saturation flux density of 15 000 gauss, compared to 7000 gauss for MPP cores. They are ideal for in-line noise filters where inductors must support large AC voltages without core saturation occurring. In filter inductors, High Flux cores provide high energy storage.

For high frequency output inductors, low cost KOOL Mµ cores (five permeabilities - 26, 60, 75, 90, 125) offer up to 80% reduction in core losses over powdered iron.

MPP, High Flux, and KOOL Mµ cores are excellent for uni-directional drive applications such as pulse or fly-back transformers.

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