Low leakage transformers for efficient line isolation in VHF swi

Electricity: power supply or regulation systems – Self-regulating – Using a transformer or inductor as the final control device

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336 82, 336170, 336188, 363126, H01F 2738

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active

045491305

ABSTRACT:
A transformer assembly suitable for use in very high frequency (VHF) switching power supplies that maintains a low leakage inductance between critical transformer windings while complying with the physical and electrical requirements imposed by standards for primary to secondary isolation. The transformer includes a telescopic bobbin assembly with an inner and an outer section that telescope together to form an interior clearance space or chamber between the two sections. The interior chamber has a narrow conduit exiting to the exterior of the bobbin assembly. Described are two embodiments for a transformer used in a forward-averaging type converter and a third embodiment for a transformer used in a frequency modulated converter.

REFERENCES:
patent: 2181899 (1939-12-01), Kennedy
patent: 2608610 (1952-08-01), Thulin
patent: 2659845 (1953-11-01), Calvert
patent: 3958328 (1976-05-01), Lee
patent: 3965408 (1976-06-01), Higuchi et al.
IBM TDB, vol. 21, No. 5, 10/78, to D. J. Clark, "Transformer Bobbin with Extended Interwinding Creepage Path", p. 1920.
IBM TDB, vol. 22, No. 9, 2/80, to J. K. Radcliffe, "Flat Winding Transformer", pp. 4009-4012.
Feng, et al., "Very-High Frequency DC-to-DC Conversion and Regulation in the Low-Megahertz Range", PCSC Record, 1971, pp. 58-65.

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