High coupling transformer adapted to a chopping supply circuit

Details High coupling transformer adapted to a chopping supply circuit High coupling transformer adapted to a chopping supply circuit

1991-02-04

1993-02-02

Kozma, Thomas J.

Inductor devices

With electric and/or magnetic shielding means

336180, 336183, 336200, 336232, H01F 1504, H01F 2730

Patent

active

051841037

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a transformer having a high degree of coupling adapted for use with a chopper supply circuit. It also relates to a chopper supply circuit employing such a transformer.
The invention pertains to technology concerned with manufacturing and optimizing multi-layer transformers.
The invention enables electrical and mechanical characteristics to be reproduced for mass reproduction, while minimizing manufacturing controls and waste.
In multi-layer technology, a transformer includes primary and secondary circuits magnetically coupled to each other by way of a magnetic circuit; these two circuits are formed by stacking printed layer turns formed as an almost-closed conducting rail.
One variant, according to the invention, enables a transformer to deliver large currents by interleaving a multi-layer printed circuit with cut metal turns; these cut metal turns have a thickness greater than that of the printed layers.
The invention permits a transformer having a very high degree of coupling to be achieved. The invention is particularly adapted for use with a chopper supply circuit which drives the windings with currents having very high frequency variations.
The transformer according to the invention is intended to be mounted in chopper supplies having dimensions as small as possible. The transformer, according to the invention, is formed as flat as possible.
In order for the apparatus to develop a predetermined level of electric power in a minimum volume, it is desirable to provide a structure that is thermally optimized. A low thermal grading between the interior and exterior of the transformer is sought. By dividing the stacked layers into N printed circuit boards, the thermal exchange surface increases by a factor N.
Finally, to reduce parasitic coupling, the transformer of the present invention is electrically optimized to minimize primary-secondary parasitic current.
To remedy the many non-resolved problems of the prior art, the present invention concerns a multi-layered transformer having a high degree of coupling. The invention is characterized particularly by the fact that two adjacent turns are at potentials as close to each other as possible. The potentials of two immediately adjacent turns of the primary and secondary are as fixed as possible. The turns most remote from the turns having the fixed potential are at variable potentials relative to the fixed potential .
Other characteristics and advantages of the present invention will appear more clearly in the description of the attached figure wherein:
FIG. 1: a diagram of a connection of secondary turns in a transformer according to the invention,
FIG. 2: a diagram indicating how the turns in a transformer according to the invention are stacked,
FIG. 3: a connection diagram of the turns of the primary of a transformer according to the invention,
FIGS. 4a-4d: three embodiments of a special turn arranged between the primary and secondary of a transformer, according to the invention,
FIG. 5: a diagram indicating how fourteen layers are stacked to form a half-winding,
FIG. 6: a design showing how insulators are used to provide optimization,
FIG. 7: an electrical diagram of a possible design,
FIG. 8: a transformer according to the invention,
FIG. 9: a terminal hub,
FIG. 10: a drawing indicating how the printed circuits and the cut metal turns are stacked.
In FIG. 1 is illustrated a diagram for the connection of secondary turns of a transformer, illustrated in FIG. 7 as including half primary windings 44 and 45, as well as half secondary windings 46 and 47. Each half secondary winding 46, 47 includes two identical parts, each comprising an odd number of turns. To reduce leakage caused by separating the two parts of a half-secondary, each a half secondary turn of one part is connected to terminals of a corresponding turn of the other part. Schematically, turns (1), (2) and (3) of half-secondary part (7) contain terminals A, B, C, D, E, F. The other half-secondary part (8) includes turns (4), (5) and (6) having successive terminals

REFERENCES:
patent: 3419834 (1968-12-01), McKechnie et al.
patent: 3483499 (1969-12-01), Lugten
patent: 3833872 (1974-09-01), Marcus et al.
patent: 4012703 (1977-03-01), Chamberlayne
patent: 4201965 (1980-05-01), Onyshkevych
patent: 4547961 (1985-10-01), Bokil et al.
patent: 4937729 (1990-06-01), Gadreau et al.
Abstract of Japanese Patent publication, vol. 10 No. 108 (E-398) (2165) Apr. 23, 1986.

Affiliated with

Also associated with

Rating

High coupling transformer adapted to a chopping supply circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High coupling transformer adapted to a chopping supply circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High coupling transformer adapted to a chopping supply circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-9048