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Combined Power Transformer And Choke

IP.com Disclosure Number: IPCOM000037754D
Original Publication Date: 1989-Jun-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Gillett, JB: AUTHOR [+2]

Abstract

The magnetic component illustrated in the drawings functions as both a tightly coupled transformer and an output filter choke in a switched mode dc-dc power converter circuit. Referring to Fig. 1, the primary winding 11 of the transformer is wound with a segment on each outer limb of a three-limbed core 13, having a center limb 15. The winding segments 11 which are wired in series, are wound such that the primary flux, /p corresponding to the conventional transformer flux associated with the primary current ip, is cumulative in the center limb 15.

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Combined Power Transformer And Choke

The magnetic component illustrated in the drawings functions as both a tightly coupled transformer and an output filter choke in a switched mode dc-dc power converter circuit. Referring to Fig. 1, the primary winding 11 of the transformer is wound with a segment on each outer limb of a three-limbed core 13, having a center limb 15. The winding segments 11 which are wired in series, are wound such that the primary flux, /p corresponding to the conventional transformer flux associated with the primary current ip, is cumulative in the center limb 15.

Referring now to Fig. 2, the secondary winding 17, is wound such that the secondary current is, flowing through either or both rectifiers 19, 21 produces an associated flux, /s, in the direction shown. This flux corresponds to the flux of an output filter choke.

Winding each primary segment in close proximity to the secondary winding, as shown in Fig. 3, ensures the tightly coupled transfer behavior required in switch mode power converters.

Disclosed anonymously.

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