Patent US4134091A successfully refreshed from Google Patents.
US4134091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low cost, high efficiency radio frequency transformer
Assignee: Individual
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Filing: 1977-12-08
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Granted: 1979-01-09
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Expires: 1997-12-08
Abstract
Abstract Especially simple structure for an electrical transformer device provides cost effective fabrication thereof and offers improved operating performance particularly in a radio transmitter circuit for coupling high levels of radio frequency energy from the output of a radio frequency amplifier to an antenna system. One winding of the transformer is formed from a single, unitary, tubular member arranged into a U-shaped configuration which includes a pair of spaced sets of openings therein for the two-fold purpose of allowing efficient threading of a secondary winding therewithin and to improve air cooling characteristics of the device. A second winding comprises a wire passed through the interior of the tubular member, and a number of cylindrically shaped magnetic elements are sleeved over the tubular member to enhance the mutual inductive coupling between the windings. A circuit board having a cut-out zone therethrough is especially adapted to have the transformer device mounted thereon in an essentially flat position juxtaposed over the cut-out zone to provide maximum convection and conduction cooling of the transformer and thereby significantly increase the power handling capabilities of the device.
Inventors
- 👤 Noel A. Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:59
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/30; H01F27/306; H01F19/00; H01F19/04; H01F27/08; H01F27/085; H01F30/00; H01F30/06; H01F30/10; H01F41/00; H01F41/02; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071; Y10T29/49073
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
271 words
An electrical transformer device including: a first winding comprising a single, unitary, elongate, electrically conductive, tubular member arranged in a generally U-shaped configuration having a bight portion and a pair of legs projecting from said portion, there being a cut-away zone between said portion and each of said legs to provide a first pair of openings in said member thereat, the outer extremities of said legs being adapted for connection to one electrical circuit and functioning to physically support said device on a base surface, said member including a second pair of openings therein respectively in said legs thereof adjacent said extremities of the latter; magnetic means laterally enveloping central stretches of each said legs; and a second winding comprising an electrically conductive wire element having the length thereof passed through the interior of said tubular member and generally randomly disposed therewithin with respect to the longitudinal axis of the latter, said wire element extending through said second pair of openings and between the latter whereby to place said wire element in inductively coupled relationship to said member, said wire element being electrically insulated from said member and having the opposite extremities thereof respectively adapted to allow connection of said second winding with another electrical circuit. said first and second pairs of openings being in cooperative communication to allow convection of heat generated within said tubular member to the atmosphere, said leg extremities and said bight portion functioning to conduct heat away from said legs and radiate the same to the atmosphere, whereby to reduce the operating temperature of said device and thereby increase the power coupling capability of said device.
Claim 2
Dependent Claim
271 words
An electrical transformer device including: a first winding comprising a single, unitary, elongate, electrically conductive, tubular member arranged in a generally U-shaped configuration having a bight portion and a pair of legs projecting from said portion, there being a cut-away zone between said portion and each of said legs to provide a first pair of openings in said member thereat, the outer extremities of said legs being adapted for connection to one electrical circuit and functioning to physically support said device on a base surface, said member including a second pair of openings therein respectively in said legs thereof adjacent said extremities of the latter; magnetic means laterally enveloping central stretches of each said legs; and a second winding comprising an electrically conductive wire element having the length thereof passed through the interior of said tubular member and generally randomly disposed therewithin with respect to the longitudinal axis of the latter, said wire element extending through said second pair of openings and between the latter whereby to place said wire element in inductively coupled relationship to said member, said wire element being electrically insulated from said member and having the opposite extremities thereof respectively adapted to allow connection of said second winding with another electrical circuit. said first and second pairs of openings being in cooperative communication to allow convection of heat generated within said tubular member to the atmosphere, said leg extremities and said bight portion functioning to conduct heat away from said legs and radiate the same to the atmosphere, whereby to reduce the operating temperature of said device and thereby increase the power coupling capability of said device.
Claim 3
Dependent Claim
102 words
The invention of claim 1, wherein: said extremities of said legs diverge away from said central stretches of said legs and away from each other, and the respective openings of said first and second pairs thereof are substantially aligned with the corresponding longitudinal axes of said tubular member along said central stretches of said legs, said extremities of said wire element being trained through respectively associated ones of said first pair of openings whereby to allow connection of said second winding to said another electrical circuit at a location spaced from the connection of said leg extremities to said one electrical circuit.
Claim 4
Dependent Claim
60 words
The invention of claim 2, wherein said length of said wire is passed through said interior of said tubular member a number of times to form a plurality of coil turns, and the lengths of said wire of said coil turns are spirally twisted about each other whereby to provide, balanced, uniform inductive coupling between said first and second windings.
Claim 5
Independent Claim
119 words
A method of making a magnetically sleeved electrical transformer including the steps of: (a) making a first pair of spaced apart openings in a length of electrically conductive tubing, near central stretches of the latter; (b) making a second pair of openings in said tubing respectively adjacent the extremities of the latter; (c) forming said tubing into a generally U-shaped configuration having a bight portion and a pair of leg portions; (d) sliding a number of magnetic members onto said tubing from an extremity of the latter; (e) after step (d) above, bending said extremities of said tubing to form one winding; and (f) passing a length of wire through the interior of said tubing to provide another winding.
Claim 6
Independent Claim
119 words
A method of making a magnetically sleeved electrical transformer including the steps of: (a) making a first pair of spaced apart openings in a length of electrically conductive tubing, near central stretches of the latter; (b) making a second pair of openings in said tubing respectively adjacent the extremities of the latter; (c) forming said tubing into a generally U-shaped configuration having a bight portion and a pair of leg portions; (d) sliding a number of magnetic members onto said tubing from an extremity of the latter; (e) after step (d) above, bending said extremities of said tubing to form one winding; and (f) passing a length of wire through the interior of said tubing to provide another winding.
Claim 7
Dependent Claim
78 words
The invention of claim 4, wherein: step (f) includes the step of making a first pair of incisions on one side of tubing, and step (b) includes the step of making a second pair of incisions on the opposite side of said tubing, step (c) being performed by bending said legs away from respectively associated ones of said first pair of incisions, step (a) being carried out by bending said extremities away from said second pair of incisions.
Claim 8
Dependent Claim
38 words
The invention of claim 5, wherein step (f) includes the step of: training the extremities of said wire out through said first pair of openings to allow connection with an electrical circuit adjacent said bight of said tubing.
Claim 9
Dependent Claim
14 words
The invention of claim 4 wherein step (f) is performed after performing step (e).
Claim 10
Dependent Claim
48 words
The invention of claim 4 wherein step (f) is successively performed a number of times to provide a plurality of coil turns in said another winding, and further including the step of: spirally twisting the length of said wire in each of said coil turns about each other.
Claim 11
Dependent Claim
259 words
In combination with a radio frequency transmitter circuit: a generally planar, circuit supporting board having a first set of adjacent circuit connections on one side thereof and having a second set of adjacent circuit connections on said one side but spaced from said first set thereof, said board including cut-out portions forming a passageway extending through opposite planar sides thereof and between said first and second sets of circuit connections; and a radio frequency transformer device mounted on said board between said first and second sets of circuit connections, said device including a first winding comprising a single, unitary, electrically conductive tubular member arrange in a generally U-shaped configuration having a bight portion disposed adjacent said first set of circuit connections and a pair of legs projecting from said bight portion toward said second set of circuit connections generally parallel to said one side of said board and superimposed over said passageway, there being a cut-away zone between said bight portion and each of said legs to provide a first pair of openings in said member thereat, the free, outer extremities of said legs being electrically connected to said second set of circuit connections, said device including a second winding comprising an electrically conductive wire having the length thereof passed through the interior of said member whereby to place said wire in inductively coupled relationship to said member, said wire being electrically insulated from said member and having the opposite extremities thereof respectively trained through said openings in said member and connected with said first set of circuit connections.
Claim 12
Dependent Claim
259 words
In combination with a radio frequency transmitter circuit: a generally planar, circuit supporting board having a first set of adjacent circuit connections on one side thereof and having a second set of adjacent circuit connections on said one side but spaced from said first set thereof, said board including cut-out portions forming a passageway extending through opposite planar sides thereof and between said first and second sets of circuit connections; and a radio frequency transformer device mounted on said board between said first and second sets of circuit connections, said device including a first winding comprising a single, unitary, electrically conductive tubular member arrange in a generally U-shaped configuration having a bight portion disposed adjacent said first set of circuit connections and a pair of legs projecting from said bight portion toward said second set of circuit connections generally parallel to said one side of said board and superimposed over said passageway, there being a cut-away zone between said bight portion and each of said legs to provide a first pair of openings in said member thereat, the free, outer extremities of said legs being electrically connected to said second set of circuit connections, said device including a second winding comprising an electrically conductive wire having the length thereof passed through the interior of said member whereby to place said wire in inductively coupled relationship to said member, said wire being electrically insulated from said member and having the opposite extremities thereof respectively trained through said openings in said member and connected with said first set of circuit connections.
Claim 13
Dependent Claim
84 words
The invention of claim 9, wherein: said leg extremities extend over portions of said one side of said board adjacent said passageway and are secured to said board, and said bight portion of said member extends over a portion of said one side of said board adjacent said passageway and is secured to said board, said leg extremities and said bight portion cooperating to mount said transformer device on said board whereby suspend said legs in superimposed relationship over said passageway through said board.
Claim 14
Dependent Claim
59 words
The invention of claim 10, wherein there is further provided: a number of magnetic elements laterally enveloping stretches of said legs, each said magnetic elements having a hole therein adapted to receive one of said legs therethrough, said length of said wire being generally randomly disposed within said tubular member with respect to the longitudinal axis of the latter.
Claim 15
Dependent Claim
76 words
The invention of claim 11, wherein: central stretches of said legs extend essentially parallel to each other, and said leg extremities are divergent away from each other, there being a second pair of openings in said tubular member respectively between said leg extremities and said central stretches of said legs, said first and second pairs of opening cooperating with each other and with said passageway in said board to effect air cooling of said transformer device.
Claim 16
Dependent Claim
29 words
The invention of claim 12, wherein said bight is electrically connected to said first set of circuit connections whereby to provide a center electrical tap of said first winding.
Claim 17
Dependent Claim
57 words
The invention of claim 9 wherein said length of said wire is passed through said tubular member a number of times to form a plurality of coil turns, and the lengths of said wire of said coil turns are spirally twisted about each other whereby to provide balanced, uniform inductive coupling between said first and second windings.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |