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Publication numberUS3058078 A
Publication typeGrant
Publication dateOct 9, 1962
Filing dateAug 7, 1958
Priority dateFeb 21, 1956
Publication numberUS 3058078 A, US 3058078A, US-A-3058078, US3058078 A, US3058078A
InventorsHoh Siegfried R
Original AssigneeHoh Siegfried R
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Low capacitance transformer
US 3058078 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Oct. 9, 1962 `s. R. HoH

LOW CAPACITANCE TRANSFORMER Original Filed Feb. 2l, 1956 I NV E N TOR. fare/5,990

ni-c.,-

kloss of essential electrical characteristics.

United tats the Air Force Original application Feb. 21, 1956, Ser. No. 567,038. Dr-

vided and this application Aug. 7, 1958, Ser. No.

4 Claims. (Cl. 336-182) (Granted under Title 35, U.S. Code (i952), sec. 266) The invention described herein may be manufactured and used by or for the United States Government for governmental purposes without payment to me of any royalty thereon.

This application forms a division of my copending application Serial No. 567,038, tiled `February 2l, 1956. The invention relates to the development of a low distributed capacitance transformer suitable for use at higher frequencies than is` possible with conventional, commercially available components.

An object of this invention is the production of a novel transformer which is of very small size without a sacrifice of elec-trical characteristics.

Another object of this invention is the production of magnetically coupled transformer which does not normally require shielding or insulation.

A further object of this invention is to provide coupling devices utilizing non-'conducting ferromagnetic ferrites or powdered iron.

A further object of this invention is the production of a novel transformer which is easily manufactured and is low in cost.

'Fliese `and other advantages, features and objects of the invention will become more apparent from the following description taken in connection with the illustrative embodiments in the accompanying drawings, wherein:

FIG. 1 shows `an end view of a miniature high-frequency transformer in section; and

FIG. 2 illustrates a top View partly in section of the embodiment of FIGURE 1.

Miniaturization of components for high frequency work is aided by the utilization of the properties of the nonconducting ferromagnetic ferrites; accordingly, the novel design of a low distributed capacitance transformer of FIGURES 1 and 2 achieve this 'desired result without a The embodiment disclosed in the gures consists of a pair of at spiral conductors 24 and 25, comprising the transformer prim-ary and secondary, in a coplanar relationship on a non-conducting `ferromagnetic ferrite disc or plate 26. Disc 26 provides the coupling between the primary and secondary. Additional ferrite discs 27 `and 28 may be provided to increase the Q of the transformer and also results in providing a shielding effect.

Conductor 24, which is a duplicate of conductor 25, shown in FIGURE 1, may be formed in many ways to conform to standard mass production techniques. For example, since a non-conducting ferromagnetic ferrite is used, conductors 24 and 25 need not be insulated, thus allowing for a closer relationship between the elements comprising the transformer. Further reduction of the spacing and transformer cost may be achieved by utilizing stampe-d sheet metal conductors `or printing the conductors ydirectly on the discs. Another method which is admirably suited for high frequency applications involves the reduction of the ferrite in the shape of the conductors to metal to forrn the conductors.

Since the stray flux of the transformer is of a very low value, shielding will not normally be required, thus aiding in the reduction of size of the transformers without sacrificing the Q factor or other electrical characteristics.

While ferromagnetic ferrites because of their high permeability are the preferred magnetic materials for the above circuit elements, powdered iron materials may also be used for low frequency applications.

Although the invention has `been described with reference to particular embodiments, it will be understood to those skilled in the art that the invention is capable of a variety of alternative embodiments within the spirit and scope of the yappended claims.

I claim:

1. A trans-former for high frequency application comprising a disc of non-conducting ferromagnetic material and a pair of fiat, generally spiral shaped conductors in -a rcoplranar relationship to said disc, said conductors being in juxtaposed alignment along one surface only of said disc.

2. A device as dened in claim 1 including a pair of discs arranged to cover said conductors.

3. A transformer comprising a dat disc of magnetic material, a primary winding of a flat, generally spiral shape and a secondary winding of a dat, generally spiral shape, said windings being arranged on one side only of said `disc in a coplanar relationship.

4. A device las defined in claim 3 including a pair of llat discs of magnetic material arranged in a coplanar relationship to cover said primary and secondary.

References Cited in the file of this patent UNITED STATES PATENTS 2,114,031 Rust et al. Apr. 12, 1938 2,474,988 Sargrove July 5, 1949 2,850,707 Wroblewski et al Sept. 2, 1958 2,910,662 Rex Oct. 27, 1959 National Bureau of 1947, particularly pp.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2114031 *Aug 8, 1935Apr 12, 1938Rca CorpRemotely controllable radio and similar high frequency receivers
US2474988 *Aug 16, 1944Jul 5, 1949Sargrove John AdolphMethod of manufacturing electrical network circuits
US2850707 *Apr 15, 1954Sep 2, 1958Sylvania Electric ProdElectromagnetic coils
US2910662 *Jun 29, 1956Oct 27, 1959Harold B RexPrinted transformer
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4059493 *Apr 29, 1976Nov 22, 1977Cities Service CompanyAnode, anode basket and method of packaging anodes
US4246446 *Dec 19, 1978Jan 20, 1981Pioneer Electronic CorporationMoving coil pick-up with coils printed on opposite sides of waver
US4517540 *Mar 28, 1980May 14, 1985Mcdougal John ASpiral windings
US5126714 *Dec 20, 1990Jun 30, 1992The United States Of America As Represented By The Secretary Of The NavyIntegrated circuit transformer
US5300911 *Oct 9, 1992Apr 5, 1994International Business Machines CorporationMonolithic magnetic device with printed circuit interconnections
US5781077 *Jan 28, 1997Jul 14, 1998Burr-Brown CorporationReducing transformer interwinding capacitance
US7376212Dec 22, 2004May 20, 2008Silicon Laboratories Inc.RF isolator with differential input/output
US7421028Jun 3, 2004Sep 2, 2008Silicon Laboratories Inc.Transformer isolator for digital power supply
US7447492Jun 3, 2004Nov 4, 2008Silicon Laboratories Inc.On chip transformer isolator
US7460604Feb 23, 2005Dec 2, 2008Silicon Laboratories Inc.RF isolator for isolating voltage sensing and gate drivers
US7545059Feb 9, 2007Jun 9, 2009Analog Devices, Inc.Chip-scale coils and isolators based thereon
US7577223Jun 30, 2007Aug 18, 2009Silicon Laboratories Inc.Multiplexed RF isolator circuit
US7650130Nov 27, 2007Jan 19, 2010Silicon Laboratories Inc.Spread spectrum isolator
US7683654Mar 23, 2010Analog Devices, Inc.Signal isolators using micro-transformers
US7692444Jul 6, 2006Apr 6, 2010Analog Devices, Inc.Signal isolators using micro-transformers
US7719305Jan 22, 2008May 18, 2010Analog Devices, Inc.Signal isolator using micro-transformers
US7737871Jun 30, 2008Jun 15, 2010Silicon Laboratories Inc.MCU with integrated voltage isolator to provide a galvanic isolation between input and output
US7738568Jun 30, 2007Jun 15, 2010Silicon Laboratories Inc.Multiplexed RF isolator
US7821428Oct 26, 2010Silicon Laboratories Inc.MCU with integrated voltage isolator and integrated galvanically isolated asynchronous serial data link
US7856219Jun 28, 2007Dec 21, 2010Silicon Laboratories Inc.Transformer coils for providing voltage isolation
US7902627Mar 8, 2011Silicon Laboratories Inc.Capacitive isolation circuitry with improved common mode detector
US7920010Apr 5, 2011Analog Devices, Inc.Signal isolators using micro-transformers
US8049573Nov 1, 2011Silicon Laboratories Inc.Bidirectional multiplexed RF isolator
US8064872Jun 24, 2008Nov 22, 2011Silicon Laboratories Inc.On chip transformer isolator
US8169108May 1, 2012Silicon Laboratories Inc.Capacitive isolator
US8198951Mar 30, 2009Jun 12, 2012Silicon Laboratories Inc.Capacitive isolation circuitry
US8441325May 14, 2013Silicon Laboratories Inc.Isolator with complementary configurable memory
US8451032Dec 22, 2010May 28, 2013Silicon Laboratories Inc.Capacitive isolator with schmitt trigger
US8736343Mar 31, 2011May 27, 2014Analog Devices, Inc.Signal isolators using micro-transformers
US9293997Mar 14, 2013Mar 22, 2016Analog Devices GlobalIsolated error amplifier for isolated power supplies
US20050269657 *Jun 3, 2004Dec 8, 2005Timothy DupuisOn chip transformer isolator
US20050271147 *Jun 3, 2004Dec 8, 2005Timothy DupuisTransformer isolator for digital power supply
US20050271148 *Dec 22, 2004Dec 8, 2005Timothy DupuisRF isolator with differential input/output
US20050271149 *Feb 23, 2005Dec 8, 2005Timothy DupuisRF isolator for isolating voltage sensing and gate drivers
US20060250155 *Jul 6, 2006Nov 9, 2006Baoxing ChenSignal isolators using micro-transformers
US20080013635 *Jun 28, 2007Jan 17, 2008Silicon Laboratories Inc.Transformer coils for providing voltage isolation
US20080025450 *Jun 30, 2007Jan 31, 2008Silicon Laboratories Inc.Multiplexed rf isolator circuit
US20080030080 *Feb 9, 2007Feb 7, 2008Baoxing ChenChip-scale coils and isolators based thereon
US20080119142 *Nov 27, 2007May 22, 2008Silicon Laboratories Inc.Spread spectrum isolator
US20080136442 *Jan 22, 2008Jun 12, 2008Baoxing ChenSignal isolator using micro-transformers
US20080267301 *Jun 30, 2007Oct 30, 2008Silicon Laboratories Inc.Bidirectional multiplexed rf isolator
US20080317106 *Jun 30, 2008Dec 25, 2008Silicon Laboratories Inc.Mcu with integrated voltage isolator and integrated galvanically isolated asynchronous serial data link
US20090027243 *Jun 30, 2008Jan 29, 2009Silicon Laboratories Inc.Mcu with integrated voltage isolator to provide a galvanic isolation between input and output
US20090243028 *Mar 30, 2009Oct 1, 2009Silicon Laboratories Inc.Capacitive isolation circuitry with improved common mode detector
US20100052826 *Jun 30, 2009Mar 4, 2010Silicon Laboratories Inc.Isolator with complementary configurable memory
US20100134139 *Nov 10, 2009Jun 3, 2010Analog Devices, Inc.Signal isolators using micro-transformers
US20110175642 *Jul 21, 2011Analog Devices, Inc.Signal isolators using micro-transformers
WO1991007765A1 *Aug 22, 1990May 30, 1991Motorola, Inc.A planar transformer and a splitter/combiner using same
Classifications
U.S. Classification336/182, 336/221, 336/232, 336/200, 336/220, 336/83
International ClassificationH01F19/00
Cooperative ClassificationH01F19/00
European ClassificationH01F19/00