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CORE-TYPE SPLIT-WINDING CONFIGURATION SWITCHED-MODE TRANSFORMER

IP.com Disclosure Number: IPCOM000005493D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2001-Oct-09
Document File: 2 page(s) / 77K

Publishing Venue

Motorola

Related People

Nikolai Goncharoff: AUTHOR [+2]

Abstract

The attached drawings show the configuration of a core-type split-winding switch mode transformer. This transformer is designed primarily for single-ended switched-mode circuits. Such circuits cost less because they use fewer components for a given power level than "push-pull" or balanced circuits.

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MOTOROLA Technical Developments Volume 3 March 1983

CORE-TYPE SPLIT-WINDING CONFIGURATION SWITCHED-MODE TRANSFORMER By Nikolai Goncharoff and Theodore V. Lester The attached drawings show the configuration of a core-type split-winding switch mode transformer.

This transformer is designed primarily for single-ended switched-mode circuits. Such circuits cost less because they use fewer components for a given power level than "push-pull" or balanced circuits.

   Since current flows through the transformer primary in one direction only, the core would become saturated unless an air gap is used. In this design, two small gaps (5 mils each) are used to reduce remanent magnetism in the core due to the unidirectional pulses.

Leakage reactance is reduced by the utilization of coaxial, non-concentric windings as shown in Fig. 1.

Two 5section bobbins are utilized in this design. Each bobbin is physically placed on the core sec- tion where the air gap is located, thus self-shielding of the core gap is achieved.

In addition to self-shielding, the 5section bobbin allows verification by sight of the dielectric in- sulation between windings.

   These transformers can be built with a variety of electrical and mechanical configurations for circuit-board or chassis mounting. With their small size and weight, they are very compatible with automated assembly equipment.

The improvements over the known technology are: It is a "corona-proof" transformer. The primary winding is separated in fo...