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Single Ended Combined Transformer and Inductor

IP.com Disclosure Number: IPCOM000089279D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Hoffman, HS: AUTHOR

Abstract

This switching energy transfer circuit has a dual function transformer having a primary and two secondary windings, one of which is in the nature of an inductor which delivers its output in flyback mode. The two secondaries are so arranged that current flows continuously in the other secondary. This, in conjunction with the magnetic topology, essentially eliminates leakage relative to that winding.

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Single Ended Combined Transformer and Inductor

This switching energy transfer circuit has a dual function transformer having a primary and two secondary windings, one of which is in the nature of an inductor which delivers its output in flyback mode. The two secondaries are so arranged that current flows continuously in the other secondary. This, in conjunction with the magnetic topology, essentially eliminates leakage relative to that winding.

The overall transformer-inductor topology minimizes part count and provides self-resetting of the nonflyback transformer portion.

Fig. 1 is a plan view of the assembled transformer-inductor structure. Fig. 2 is an exploded, partly broken away, elevation section view. When assembled, the two portions of the core structure merge, as indicated by arrow 8. The three- legged magnetic structure is assembled with two coil structures 10, 12. Coil 10 is a transformer nonflyback secondary, and coil structure 12 includes the inductor or flyback secondary 14 and a primary winding 16. One magnetic leg 18, having an air gap 20, is the inductor leg. Another leg 22 is the transformer leg, and the third is a return leg 24. Return leg 24 is composed of parts 26 and 28. Part 28 carries 22, and 26 carries 18. Transformer leg 22 is surrounded by its secondary coil 10, and is in turn nearly surrounded by inductor leg 18. Around all this is the coil 12 containing the inductor secondary and primary winding.

Fig. 3 shows the electrical schematic corresponding to Figs. 1 and 2 as employed with an associated primary switch 30 and output connections 32. Transformer secondary...