Magnetic core with magnetic ribbon in gap thereof

Details Magnetic core with magnetic ribbon in gap thereof Magnetic core with magnetic ribbon in gap thereof

1979-01-02

1980-04-22

Kozma, Thomas J.

Inductor devices

With closed core interrupted by an air gap

336233, H01F 1706, H01F 2724

Patent

active

041997441

ABSTRACT:
A ferrite toroid has two radially extending gaps. Into each gap there is inserted an insulative shim having a magnetic metal ribbon folded over the shim. When current is applied to a winding on the core, the resultant magnetic flux is steered into the magnetic ribbons and around the gaps. For high frequency excitations eddy current losses in the ribbons are high and the windings have low Q but high inductance. At high winding currents, the magnetic ribbons are saturated, the inductance is reduced and the Q of the winding increases. In a switching voltage regulator, this inductor tends to generate only a small amount of ringing and electromagnetic radiation noise.

REFERENCES:
patent: 3212006 (1965-10-01), McQuarrie
patent: 3360753 (1967-12-01), Wroblewski
patent: 3725832 (1973-04-01), Schweitzer, Jr.
patent: 3748618 (1973-07-01), Kaiserwerth et al.

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