Inductive devices

Details Inductive devices Inductive devices

1987-01-08

1987-09-15

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363133, 361 11, 361 58, H02H 7122

Patent

active

046943870

ABSTRACT:
An inductive device composed of a bead (10) of magnetic material, such as ferrite, has an aperture through which an electrical conductor (13) is adapted to pass and a reset winding (14) wound thereon and connected to a source of constant current. The constant reset current resets the bead of magnetic material so that the maximum volt-second absorbtion capability of the bead is available for preventing destructively high current spikes from flowing through the electrical conductor. The inductive device is advantageously used in the d.c. supply of the power transistors (101 and 102) of an inverter (100) to protect the transistors from current surges due to the simultaneous conduction of the transistors.

REFERENCES:
patent: 2594890 (1952-04-01), Ellwood
patent: 3831078 (1974-08-01), Peil
patent: 4190883 (1980-02-01), Cowett, Jr.
patent: 4275430 (1981-06-01), Seki et al.
patent: 4323840 (1982-04-01), Gawler
patent: 4328538 (1982-05-01), Pollmeier
patent: 4489370 (1984-12-01), Migliori

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