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Patent US3805792A successfully refreshed from Google Patents.
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EP0072151A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Transformers

Assignee: BAE Systems Electronics Ltd
•
Filing: 1982-07-29
•
Granted: —
•
Expires: 2002-07-29
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Abstract

Abstract A pulse transformer (3) is used in a radar transmitter to transform a high current pulse at relatively low voltage into a very high voltage pulse which can be used to directly drive a magnetron oscillator (4). The potential of the output pulse can be of the order of 30 kV and since the transformer is required to operate at very high peak powers of the order of two megawatts, it must be very carefully designed to avoid excessive electrical losses and voltage breakdown. The core material of the transformer consists of a closely wound reel of magnetic material in the form of an elongate tape, which is mechanically fragile. The magnetic core (31) is loosely mounted within a sealed container so that the primary (25, 26, 27, 28, 29) and secondary (35) windings surround it. A conductive shield (36) is placed around the magnetic material so as to protect it from the very large electric fields generated within the transformer. This prevents the ionisation of gases which could lead to the rapid deterioration of the magnetic core material.

Inventors

  • 👤 Robert Richardson

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 07:43
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/288; H01F27/2885; H01F27/34; H01F27/36; H01F27/363; H01F30/00; H01F30/06; H01F30/16

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 123 words
A transformer including a core material shaped to constitute a closed magnetic loop; a transformer primary winding and a secondary winding arranged in use to magnetically couple with said core material; and electrically conductive shielding means arranged to surround said core material so as to shield it from electric fields associated with the windings, and the shielding means having an electrical discontinuity so that it does not itself constitute a transformer winding; and wherein the core material is loosely mounted within the shielding means to minimise mechanical stress imposed upon the core material; and the primary winding including a central conductor which is encircled by the core material, and a plurality of studs arranged on a circle lying outside of said secondary winding.
Claim 2
Dependent Claim 123 words
A transformer including a core material shaped to constitute a closed magnetic loop; a transformer primary winding and a secondary winding arranged in use to magnetically couple with said core material; and electrically conductive shielding means arranged to surround said core material so as to shield it from electric fields associated with the windings, and the shielding means having an electrical discontinuity so that it does not itself constitute a transformer winding; and wherein the core material is loosely mounted within the shielding means to minimise mechanical stress imposed upon the core material; and the primary winding including a central conductor which is encircled by the core material, and a plurality of studs arranged on a circle lying outside of said secondary winding.
Claim 3
Dependent Claim 32 words
A transformer as claimed in claim 1 and wherein the core material is sealed in a closed hollow annular container having a shape and size slightly larger than the core material itself.
Claim 4
Dependent Claim 27 words
A transformer as claimed in claim 2 and wherein the outer surface of the container is provided with an electrically conductive coating to constitute said shielding means.
Claim 5
Dependent Claim 19 words
A transformer as claimed in claim 3 and wherein the discontinuity is a single continuous interruption of the coating.
Claim 6
Dependent Claim 38 words
A transformer as claimed in claim 3 or 4 and wherein the secondary winding is a high voltage winding which is wound around the container and spaced apart from the electrically conductive coating by intervening electrically insulating material.
Claim 7
Dependent Claim 19 words
A transformer as claimed in claim 5 and wherein the primary winding is a single turn low voltage winding.
Claim 8
Dependent Claim 25 words
A transformer as claimed in claim 6 and wherein the transformer windings are held in place by a settable resin which is moulded around them.
Claim 9
Dependent Claim 94 words
A transformer as claimed in claim 6 or 7 and wherein a conductive plate is provided to electrically link one end of each of the studs with the central conductor, and wherein a double sided printed circuit board is provided in contact with the other ends of each of the studs and the central conductor so that a conductive surface on one side of the printed circuit board makes electrical connection to said studs and a conductive surface on the other side of the printed circuit board makes electrical connection to said central conductor.
Claim 10
Dependent Claim 14 words
A pulse circuit including a transformer as claimed in any of the preceding claims.

References Cited (Backward Citations)

DE922839C Cited
DE1638852B2 Cited
DE2438631B2 Cited
GB1581415A Cited
DE2825854A1 Cited

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