US3058078A - Low capacitance transformer - Google Patents
Low capacitance transformer Download PDFInfo
- Publication number
- US3058078A US3058078A US753849A US75384958A US3058078A US 3058078 A US3058078 A US 3058078A US 753849 A US753849 A US 753849A US 75384958 A US75384958 A US 75384958A US 3058078 A US3058078 A US 3058078A
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- transformer
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- low capacitance
- disc
- capacitance transformer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F19/00—Fixed transformers or mutual inductances of the signal type
Definitions
- 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.
- FIG. 1 shows ⁇ an end view of a miniature high-frequency transformer in section
- FIG. 2 illustrates a top View partly in section of the embodiment of FIGURE 1.
- 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.
- 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.
- 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.
- a device as dened in claim 1 including a pair of discs arranged to cover said conductors.
- 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.
- 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.
Description
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.
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.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US753849A US3058078A (en) | 1956-02-21 | 1958-08-07 | Low capacitance transformer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US56703856A | 1956-02-21 | 1956-02-21 | |
US753849A US3058078A (en) | 1956-02-21 | 1958-08-07 | Low capacitance transformer |
Publications (1)
Publication Number | Publication Date |
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US3058078A true US3058078A (en) | 1962-10-09 |
Family
ID=27074347
Family Applications (1)
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US753849A Expired - Lifetime US3058078A (en) | 1956-02-21 | 1958-08-07 | Low capacitance transformer |
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Cited By (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4059493A (en) * | 1976-04-29 | 1977-11-22 | Cities Service Company | Anode, anode basket and method of packaging anodes |
US4246446A (en) * | 1977-12-23 | 1981-01-20 | Pioneer Electronic Corporation | Moving coil pick-up with coils printed on opposite sides of waver |
US4517540A (en) * | 1977-05-13 | 1985-05-14 | Mcdougal John A | Spiral windings |
WO1991007765A1 (en) * | 1989-11-22 | 1991-05-30 | Motorola, Inc. | A planar transformer and a splitter/combiner using same |
US5126714A (en) * | 1990-12-20 | 1992-06-30 | The United States Of America As Represented By The Secretary Of The Navy | Integrated circuit transformer |
US5300911A (en) * | 1991-07-10 | 1994-04-05 | International Business Machines Corporation | Monolithic magnetic device with printed circuit interconnections |
US5781077A (en) * | 1997-01-28 | 1998-07-14 | Burr-Brown Corporation | Reducing transformer interwinding capacitance |
US20050269657A1 (en) * | 2004-06-03 | 2005-12-08 | Timothy Dupuis | On chip transformer isolator |
US20050271147A1 (en) * | 2004-06-03 | 2005-12-08 | Timothy Dupuis | Transformer isolator for digital power supply |
US20050271149A1 (en) * | 2004-06-03 | 2005-12-08 | Timothy Dupuis | RF isolator for isolating voltage sensing and gate drivers |
US20050271148A1 (en) * | 2004-06-03 | 2005-12-08 | Timothy Dupuis | RF isolator with differential input/output |
US20060250155A1 (en) * | 2003-04-30 | 2006-11-09 | Baoxing Chen | Signal isolators using micro-transformers |
US20080013635A1 (en) * | 2004-06-03 | 2008-01-17 | Silicon Laboratories Inc. | Transformer coils for providing voltage isolation |
US20080025450A1 (en) * | 2004-06-03 | 2008-01-31 | Silicon Laboratories Inc. | Multiplexed rf isolator circuit |
US20080030080A1 (en) * | 1997-10-23 | 2008-02-07 | Baoxing Chen | Chip-scale coils and isolators based thereon |
US20080136442A1 (en) * | 2006-07-06 | 2008-06-12 | Baoxing Chen | Signal isolator using micro-transformers |
US20080267301A1 (en) * | 2004-06-03 | 2008-10-30 | Silicon Laboratories Inc. | Bidirectional multiplexed rf isolator |
US20080317106A1 (en) * | 2004-06-03 | 2008-12-25 | Silicon Laboratories Inc. | Mcu with integrated voltage isolator and integrated galvanically isolated asynchronous serial data link |
US20090027243A1 (en) * | 2004-06-03 | 2009-01-29 | Silicon Laboratories Inc. | Mcu with integrated voltage isolator to provide a galvanic isolation between input and output |
US20090243028A1 (en) * | 2004-06-03 | 2009-10-01 | Silicon Laboratories Inc. | Capacitive isolation circuitry with improved common mode detector |
US20100052826A1 (en) * | 2004-06-03 | 2010-03-04 | Silicon Laboratories Inc. | Isolator with complementary configurable memory |
US7738568B2 (en) | 2004-06-03 | 2010-06-15 | Silicon Laboratories Inc. | Multiplexed RF isolator |
US8169108B2 (en) | 2004-06-03 | 2012-05-01 | Silicon Laboratories Inc. | Capacitive isolator |
US8198951B2 (en) | 2004-06-03 | 2012-06-12 | Silicon Laboratories Inc. | Capacitive isolation circuitry |
US8451032B2 (en) | 2010-12-22 | 2013-05-28 | Silicon Laboratories Inc. | Capacitive isolator with schmitt trigger |
US9293997B2 (en) | 2013-03-14 | 2016-03-22 | Analog Devices Global | Isolated error amplifier for isolated power supplies |
US9660848B2 (en) | 2014-09-15 | 2017-05-23 | Analog Devices Global | Methods and structures to generate on/off keyed carrier signals for signal isolators |
US9998301B2 (en) | 2014-11-03 | 2018-06-12 | Analog Devices, Inc. | Signal isolator system with protection for common mode transients |
US10270630B2 (en) | 2014-09-15 | 2019-04-23 | Analog Devices, Inc. | Demodulation of on-off-key modulated signals in signal isolator systems |
US10290608B2 (en) | 2016-09-13 | 2019-05-14 | Allegro Microsystems, Llc | Signal isolator having bidirectional diagnostic signal exchange |
US10419251B2 (en) | 2002-09-18 | 2019-09-17 | Infineon Technologies | Digital signal transfer using integrated transformers with electrical isolation |
US10536309B2 (en) | 2014-09-15 | 2020-01-14 | Analog Devices, Inc. | Demodulation of on-off-key modulated signals in signal isolator systems |
US11115244B2 (en) | 2019-09-17 | 2021-09-07 | Allegro Microsystems, Llc | Signal isolator with three state data transmission |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2114031A (en) * | 1934-08-03 | 1938-04-12 | Rca Corp | Remotely controllable radio and similar high frequency receivers |
US2474988A (en) * | 1943-08-30 | 1949-07-05 | Sargrove John Adolph | Method of manufacturing electrical network circuits |
US2850707A (en) * | 1954-04-15 | 1958-09-02 | Sylvania Electric Prod | Electromagnetic coils |
US2910662A (en) * | 1956-06-29 | 1959-10-27 | Harold B Rex | Printed transformer |
-
1958
- 1958-08-07 US US753849A patent/US3058078A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2114031A (en) * | 1934-08-03 | 1938-04-12 | Rca Corp | Remotely controllable radio and similar high frequency receivers |
US2474988A (en) * | 1943-08-30 | 1949-07-05 | Sargrove John Adolph | Method of manufacturing electrical network circuits |
US2850707A (en) * | 1954-04-15 | 1958-09-02 | Sylvania Electric Prod | Electromagnetic coils |
US2910662A (en) * | 1956-06-29 | 1959-10-27 | Harold B Rex | Printed transformer |
Cited By (56)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4059493A (en) * | 1976-04-29 | 1977-11-22 | Cities Service Company | Anode, anode basket and method of packaging anodes |
US4517540A (en) * | 1977-05-13 | 1985-05-14 | Mcdougal John A | Spiral windings |
US4246446A (en) * | 1977-12-23 | 1981-01-20 | Pioneer Electronic Corporation | Moving coil pick-up with coils printed on opposite sides of waver |
WO1991007765A1 (en) * | 1989-11-22 | 1991-05-30 | Motorola, Inc. | A planar transformer and a splitter/combiner using same |
US5126714A (en) * | 1990-12-20 | 1992-06-30 | The United States Of America As Represented By The Secretary Of The Navy | Integrated circuit transformer |
US5300911A (en) * | 1991-07-10 | 1994-04-05 | International Business Machines Corporation | Monolithic magnetic device with printed circuit interconnections |
US5781077A (en) * | 1997-01-28 | 1998-07-14 | Burr-Brown Corporation | Reducing transformer interwinding capacitance |
US20080030080A1 (en) * | 1997-10-23 | 2008-02-07 | Baoxing Chen | Chip-scale coils and isolators based thereon |
US7545059B2 (en) | 1997-10-23 | 2009-06-09 | Analog Devices, Inc. | Chip-scale coils and isolators based thereon |
US10419251B2 (en) | 2002-09-18 | 2019-09-17 | Infineon Technologies | Digital signal transfer using integrated transformers with electrical isolation |
US8736343B2 (en) | 2003-04-30 | 2014-05-27 | Analog Devices, Inc. | Signal isolators using micro-transformers |
US20060250155A1 (en) * | 2003-04-30 | 2006-11-09 | Baoxing Chen | Signal isolators using micro-transformers |
US20100134139A1 (en) * | 2003-04-30 | 2010-06-03 | Analog Devices, Inc. | Signal isolators using micro-transformers |
US7692444B2 (en) | 2003-04-30 | 2010-04-06 | Analog Devices, Inc. | Signal isolators using micro-transformers |
US7920010B2 (en) | 2003-04-30 | 2011-04-05 | Analog Devices, Inc. | Signal isolators using micro-transformers |
US7683654B2 (en) | 2003-04-30 | 2010-03-23 | Analog Devices, Inc. | Signal isolators using micro-transformers |
US20110175642A1 (en) * | 2003-04-30 | 2011-07-21 | Analog Devices, Inc. | Signal isolators using micro-transformers |
US7650130B2 (en) | 2004-06-03 | 2010-01-19 | Silicon Laboratories Inc. | Spread spectrum isolator |
US7856219B2 (en) | 2004-06-03 | 2010-12-21 | Silicon Laboratories Inc. | Transformer coils for providing voltage isolation |
US20080267301A1 (en) * | 2004-06-03 | 2008-10-30 | Silicon Laboratories Inc. | Bidirectional multiplexed rf isolator |
US7447492B2 (en) | 2004-06-03 | 2008-11-04 | Silicon Laboratories Inc. | On chip transformer isolator |
US7460604B2 (en) | 2004-06-03 | 2008-12-02 | Silicon Laboratories Inc. | RF isolator for isolating voltage sensing and gate drivers |
US20080317106A1 (en) * | 2004-06-03 | 2008-12-25 | Silicon Laboratories Inc. | Mcu with integrated voltage isolator and integrated galvanically isolated asynchronous serial data link |
US20090027243A1 (en) * | 2004-06-03 | 2009-01-29 | Silicon Laboratories Inc. | Mcu with integrated voltage isolator to provide a galvanic isolation between input and output |
US20050269657A1 (en) * | 2004-06-03 | 2005-12-08 | Timothy Dupuis | On chip transformer isolator |
US7577223B2 (en) | 2004-06-03 | 2009-08-18 | Silicon Laboratories Inc. | Multiplexed RF isolator circuit |
US20090243028A1 (en) * | 2004-06-03 | 2009-10-01 | Silicon Laboratories Inc. | Capacitive isolation circuitry with improved common mode detector |
US20080119142A1 (en) * | 2004-06-03 | 2008-05-22 | Silicon Laboratories Inc. | Spread spectrum isolator |
US20100052826A1 (en) * | 2004-06-03 | 2010-03-04 | Silicon Laboratories Inc. | Isolator with complementary configurable memory |
US7376212B2 (en) | 2004-06-03 | 2008-05-20 | Silicon Laboratories Inc. | RF isolator with differential input/output |
US20080025450A1 (en) * | 2004-06-03 | 2008-01-31 | Silicon Laboratories Inc. | Multiplexed rf isolator circuit |
US20050271147A1 (en) * | 2004-06-03 | 2005-12-08 | Timothy Dupuis | Transformer isolator for digital power supply |
US20080013635A1 (en) * | 2004-06-03 | 2008-01-17 | Silicon Laboratories Inc. | Transformer coils for providing voltage isolation |
US7738568B2 (en) | 2004-06-03 | 2010-06-15 | Silicon Laboratories Inc. | Multiplexed RF isolator |
US7737871B2 (en) | 2004-06-03 | 2010-06-15 | Silicon Laboratories Inc. | MCU with integrated voltage isolator to provide a galvanic isolation between input and output |
US7821428B2 (en) | 2004-06-03 | 2010-10-26 | Silicon Laboratories Inc. | MCU with integrated voltage isolator and integrated galvanically isolated asynchronous serial data link |
US7421028B2 (en) | 2004-06-03 | 2008-09-02 | Silicon Laboratories Inc. | Transformer isolator for digital power supply |
US7902627B2 (en) | 2004-06-03 | 2011-03-08 | Silicon Laboratories Inc. | Capacitive isolation circuitry with improved common mode detector |
US20050271148A1 (en) * | 2004-06-03 | 2005-12-08 | Timothy Dupuis | RF isolator with differential input/output |
US20050271149A1 (en) * | 2004-06-03 | 2005-12-08 | Timothy Dupuis | RF isolator for isolating voltage sensing and gate drivers |
US8049573B2 (en) | 2004-06-03 | 2011-11-01 | Silicon Laboratories Inc. | Bidirectional multiplexed RF isolator |
US8064872B2 (en) | 2004-06-03 | 2011-11-22 | Silicon Laboratories Inc. | On chip transformer isolator |
US8169108B2 (en) | 2004-06-03 | 2012-05-01 | Silicon Laboratories Inc. | Capacitive isolator |
US8198951B2 (en) | 2004-06-03 | 2012-06-12 | Silicon Laboratories Inc. | Capacitive isolation circuitry |
US8441325B2 (en) | 2004-06-03 | 2013-05-14 | Silicon Laboratories Inc. | Isolator with complementary configurable memory |
US7719305B2 (en) | 2006-07-06 | 2010-05-18 | Analog Devices, Inc. | Signal isolator using micro-transformers |
US20080136442A1 (en) * | 2006-07-06 | 2008-06-12 | Baoxing Chen | Signal isolator using micro-transformers |
US8451032B2 (en) | 2010-12-22 | 2013-05-28 | Silicon Laboratories Inc. | Capacitive isolator with schmitt trigger |
US9293997B2 (en) | 2013-03-14 | 2016-03-22 | Analog Devices Global | Isolated error amplifier for isolated power supplies |
US9660848B2 (en) | 2014-09-15 | 2017-05-23 | Analog Devices Global | Methods and structures to generate on/off keyed carrier signals for signal isolators |
US10270630B2 (en) | 2014-09-15 | 2019-04-23 | Analog Devices, Inc. | Demodulation of on-off-key modulated signals in signal isolator systems |
US10536309B2 (en) | 2014-09-15 | 2020-01-14 | Analog Devices, Inc. | Demodulation of on-off-key modulated signals in signal isolator systems |
US9998301B2 (en) | 2014-11-03 | 2018-06-12 | Analog Devices, Inc. | Signal isolator system with protection for common mode transients |
US10290608B2 (en) | 2016-09-13 | 2019-05-14 | Allegro Microsystems, Llc | Signal isolator having bidirectional diagnostic signal exchange |
US10651147B2 (en) | 2016-09-13 | 2020-05-12 | Allegro Microsystems, Llc | Signal isolator having bidirectional communication between die |
US11115244B2 (en) | 2019-09-17 | 2021-09-07 | Allegro Microsystems, Llc | Signal isolator with three state data transmission |
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