Integrated transformer and inductor

Details Integrated transformer and inductor Integrated transformer and inductor

1985-04-15

1986-09-23

Kozma, Thomas J.

Inductor devices

Core forms casing

336160, 336165, 336178, 336212, H01F 1706

Patent

active

046138412

ABSTRACT:
An electrical transformer comprises a hollow form exhibiting high magnetic permeability and interior projections extending between separable halves of the form to provide a low magnetic leakage transformer core. Primary and secondary windings are disposed around the central projections. Furthermore, there is included means internal to the form for providing a lower permeability magnetic circuit shunt path. The internal shunt path means is typically either a cylinder or disc structure. A reduction in stray magnetic flux is desirable since it means that smaller, less expensive transformers may be constructed. The transformer of the present invention is particularly useful in electronic ballast circuits for gas discharge lamps because the magnetic shunt path acts as a current-limiting inductor. Moreover, since the transformers of the present invention do not generate external magnetic fields, flux shields are not required to maintain high efficiency.

REFERENCES:
patent: 1803868 (1931-05-01), Porter
patent: 2494579 (1950-01-01), Pimlott et al.
patent: 2519224 (1950-08-01), Chiles, Jr. et al.
patent: 2567394 (1951-09-01), Nuttman
patent: 2823359 (1958-02-01), Wentworth
patent: 2949591 (1960-08-01), Craige
patent: 3407334 (1968-10-01), Attewell
patent: 4060759 (1977-11-01), Pana
patent: 4123690 (1978-10-01), Osteen
patent: 4356468 (1982-10-01), Van Laar

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