US1781308A - High-frequency differential transformer - Google Patents
High-frequency differential transformer Download PDFInfo
- Publication number
- US1781308A US1781308A US367093A US36709329A US1781308A US 1781308 A US1781308 A US 1781308A US 367093 A US367093 A US 367093A US 36709329 A US36709329 A US 36709329A US 1781308 A US1781308 A US 1781308A
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- United States
- Prior art keywords
- coil
- transformer
- differential transformer
- cable
- windings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S174/00—Electricity: conductors and insulators
- Y10S174/13—High voltage cable, e.g. above 10kv, corona prevention
- Y10S174/14—High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding
- Y10S174/24—High voltage cable, e.g. above 10kv, corona prevention having a particular cable application, e.g. winding in an inductive device, e.g. reactor, electromagnet
- Y10S174/25—Transformer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling
Description
Nov. 11, 1930. M. vos 1,781,308
HIGH FREQUENCY DIFFERENTIAL TRANSFORMER Filed May 29, 1929 M/vewfa 1L Patented Nov. 11, 1930 UNITED STATES PATENT OFFICE MAURITZ VOS, OF STOCKHOLM, SWEDEN, ASSIGNOR TO TELEFONAKTIEBOLAGET L. M. ERICSSON, OF STOCKHOLM, SWEDEN, A COMPANY OF SWEDEN HIGH-FREQUENCY DIFFERENTIAL TRANSFORMER Application filed May 29, 1929, Serial No. 367,093, and in Sweden May 30, 1928.
scribed with reference to the accompanying drawing. Figure 1 shows diagrammatical- 1y for comparison the usual construction of a differential transformer adapted for ordinary speech current-s. Figure 2 shows diagrammatically an embodiment of a high fre-- quency differential transformer according to the invention. Figure 3 shows diagrammatically a detail of the one part of the transformer according to Figure 2. Figure 4 shows a section of the winding on a larger scale, and Figure 5 is a side elevation of one of two separate coils forming together the transformer, said coil being shown in a partial wound condition.
Differential transformers for telephone purposes must be constructed to meet the following general requirements:
1. The coupling coefficient between the different windings must be approximately equal to 1.
2. The transformer must be connected to the line in such a manner that in all respects it is symmetrical in relation to earth.
3. The ohmic and iron losses must be small.
These requirements are easy to fulfill in respect of differential transformers for lower frequencies such as speech frequencies. In the design of such a differential transformer for ordinary telephone currents, as shown diagrammatically in Figure 1, the primary winding is divided into four partial windings A A A A, which, connected in series, two partial windings being in-' cluded in each of the branches of the incoming or outgoing line L, to which the differential transformer is connected by the terminals 1. Inserted between the opposite terminals 2 of the primary winding is a balance impedance N having the same impedance value as the line. The secondary winding consists of two partial windings B 13 connected in series each of which is coupled inductively to one partial winding A and A, respectively or A and A respectively in each of the line branches. As the use of an iron core in this case does not result in any substantial losses or other inconveniences, the coupling coefficient between the windings may be made sufficiently tight without difficulty. The two amplifiers of the two-wire repeater operating in opposite directions of propagation are connected up to the middle terminals 3 of the primary winding and the terminals 1 of the secondary winding respectively. The letter I designates for instance the input impedance of one of said amplifiers, while U designates the output impedance of the otheramplifier. The partial windings included in different branches of the line L, evidently, form in relation to each other a condenser interconnected between the branches and having a comparatively large capacity. In a transformer for currents of low frequency said capacity does not, however, disturb the speech transmission to any noticeable degree.
On the other hand, certain constructive difficulties arise when designing a differential transformer for high frequency currents. In this case the following additional requirements must be fulfilled by the differential transformer 4. The transformer must not introduce any capacity between the branches of the line because such a capacity would represent a short-circuit for the high frequency currents.
5. The high degree of coupling required between the windings must be brought about without the use of iron cores as otherwise the iron losses would be too great.
According to the invention the required light coupling in the ironless differential transformer and the desired absence of capacity between the branches is brought about by composing the differential transformer of two separate coils adapted to be connected to each one of the branches of a line circuit, each of said coils consisting of two series connected primary partial windings and two sec- Ondary partial windings which four partial windings are formed b parallel conductors of a twisted quad of a four core cable, means protecting each of the coils against capacitive influence of the other coil being provided.
Figure 2 shows diagranimatically a differential transformer for high frequency designed according to the invention. The one of the two coils of the transformer comprises the two primary partial windings A A connected in series in the one line branch and the two secondary partial windings B B The second coil of the transformer similarly comp rises two primary partial windings A A connected in series in the other line branch and two secondary partial windings B 13.. Each of said transformer coils is enclosed in acover 5 and 5 respectively. The differential transformer is thus sub-divided into two parts capacitively separated from each other and included in different line branches. Each coil is mounted on a bobbin 6, Figure 5, provided with two annular coil spaces 89 separated by a partition 7. The
four partial windings of each coil are formed by four parallel stranded conductors 10 of afour-core cable or a quad wire bundle 11 the one half of which is wound in the coil space 8 and the other half in the coil space 9 on the bobbin 6. The transformer as a whole will, consequently, comprise two bobbins 6 each provided with windings as described. The
winding on of the cable 11 is performed, as
shown in Figure 5, in such a manner that the cable at its middle point 12 is pressed into a radial slot 13 in the partition 7 down to the bottom of the coil spaces. Thereupon first the one half of the cable is wound on in the appertaining coil space, while the other half in its entirety is allowed to participate in the rotation of the bobbin. After the first mentioned coil space, by way of example 8, has been thus filled by one half of the cable, the second half of the cable is wound on in the opposite direction in the other coil space 9. During the winding on of the cable the latter is twisted uniformly so that the four wires are-twisted mutually with a constant pitch. By this method all the winding parts will be in-a quite equivalent relation to each other.
By the described disposition of the coils a complete symmetry in each coil is obtained. This can be seen most clearly in Figure 3 which illustrates diagrammatically the winding arrangement for the upper coil in Figure 2. In Figure 3 two groups of four windings are shown each group representing one half of the cable 11 and each being provided in a coil space 8 or 9 respectively. The junctions 12 between the two groups correspond to the transversal part 12 of the cable squeezed into the slot 13 of the partition. Each of the partial windings A A B 2 are illustrated in Figure 3 as comprising two windings. elements connected in series said winding elements being disposed each in one of the winding spaces 8, 9 of the bobbin. By disposing the middle point of the winding in nermost in the coil all the tappings can be arranged on the outside of the coil, as shown in Figure 3. The tappings a, 0 and d, e respectively mutually corresponding to each other will then be disposed symmetrically on opposite sides of the partition 7 whereas the middle point tapping b of the primary winding half will be disposed in the middle on the outside of the coil.
By the described disposition of the four partial windings in each coil 2. coupling coeflicient between the different part windings is obtained which partically equals 1.
The above described arrangement in which the differential transformer is composed of two separate coils and made up of a twisted quad cable may, of course, also be applied in those cases when iron may be allowed to be present in the circuit. This arrangement has the advantage among other that the capacity between the line branches is reduced.
I claim:
1. A transformer for high frequency 0scillations comprising in combination two separate coils adapted to be connected to each one of the branches of a line circuit, each of said coils consisting of two series connected primary partial windings and two secondary partial windings which four partial windings are formed by parallel conductors of a twisted quad of a four-core cable, and means protecting each of the coils against capacitiveinfluence of the other coil.
2. A transformer as claimed in claim 1, characterized by the four conductors being twisted together with a uniform pitch.
3. A transformer as claimed in claim 1, characterized by the middle point of the twisted cable of each coil being disposed innermost in the coil from which point the two halves of the twisted cable are wound in opposite directions.
4. A transformer as claimed in claim 1, characterized by the middle point of the twisted cable on each coil being squeezed into a radial slot in a partition dividing the coil into two e ual parts, the two halves of the twisted cab e being wound on opposite sides of and symmetrically in relation to said partition.
In testimony whereof I aflix my signature.
MAURITZ' VOS.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE1781308X | 1928-05-30 |
Publications (1)
Publication Number | Publication Date |
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US1781308A true US1781308A (en) | 1930-11-11 |
Family
ID=20423577
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US367093A Expired - Lifetime US1781308A (en) | 1928-05-30 | 1929-05-29 | High-frequency differential transformer |
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US (1) | US1781308A (en) |
Cited By (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2654058A (en) * | 1948-12-22 | 1953-09-29 | Frank H Mcintosh | Wide band transformer |
US3168715A (en) * | 1962-06-27 | 1965-02-02 | Gen Electric | Trifilar wound hybrid transformer |
US3428920A (en) * | 1966-11-29 | 1969-02-18 | Adams Russel Co Inc | N-way electrical power divider wherein n is an odd number |
US4484974A (en) * | 1983-06-27 | 1984-11-27 | Loral Corporation | Multiple layer coil winding system |
US4635019A (en) * | 1984-08-21 | 1987-01-06 | Tdk Corporation | Coil apparatus with divided windings |
WO1999028923A1 (en) * | 1997-11-28 | 1999-06-10 | Abb Ab | Transformer |
US6261437B1 (en) | 1996-11-04 | 2001-07-17 | Asea Brown Boveri Ab | Anode, process for anodizing, anodized wire and electric device comprising such anodized wire |
US6279850B1 (en) | 1996-11-04 | 2001-08-28 | Abb Ab | Cable forerunner |
US6357688B1 (en) | 1997-02-03 | 2002-03-19 | Abb Ab | Coiling device |
US6369470B1 (en) | 1996-11-04 | 2002-04-09 | Abb Ab | Axial cooling of a rotor |
US6376775B1 (en) | 1996-05-29 | 2002-04-23 | Abb Ab | Conductor for high-voltage windings and a rotating electric machine comprising a winding including the conductor |
US6396187B1 (en) | 1996-11-04 | 2002-05-28 | Asea Brown Boveri Ab | Laminated magnetic core for electric machines |
US6417456B1 (en) | 1996-05-29 | 2002-07-09 | Abb Ab | Insulated conductor for high-voltage windings and a method of manufacturing the same |
US6429563B1 (en) | 1997-02-03 | 2002-08-06 | Abb Ab | Mounting device for rotating electric machines |
US6439497B1 (en) | 1997-02-03 | 2002-08-27 | Abb Ab | Method and device for mounting a winding |
US6465979B1 (en) | 1997-02-03 | 2002-10-15 | Abb Ab | Series compensation of electric alternating current machines |
US6525265B1 (en) | 1997-11-28 | 2003-02-25 | Asea Brown Boveri Ab | High voltage power cable termination |
US6525504B1 (en) | 1997-11-28 | 2003-02-25 | Abb Ab | Method and device for controlling the magnetic flux in a rotating high voltage electric alternating current machine |
US6577487B2 (en) | 1996-05-29 | 2003-06-10 | Asea Brown Boveri Ab | Reduction of harmonics in AC machines |
US6646363B2 (en) | 1997-02-03 | 2003-11-11 | Abb Ab | Rotating electric machine with coil supports |
US6801421B1 (en) | 1998-09-29 | 2004-10-05 | Abb Ab | Switchable flux control for high power static electromagnetic devices |
US6822363B2 (en) | 1996-05-29 | 2004-11-23 | Abb Ab | Electromagnetic device |
US6825585B1 (en) | 1997-02-03 | 2004-11-30 | Abb Ab | End plate |
US6828701B1 (en) | 1997-02-03 | 2004-12-07 | Asea Brown Boveri Ab | Synchronous machine with power and voltage control |
US6831388B1 (en) | 1996-05-29 | 2004-12-14 | Abb Ab | Synchronous compensator plant |
US6873080B1 (en) | 1997-09-30 | 2005-03-29 | Abb Ab | Synchronous compensator plant |
US6885273B2 (en) | 2000-03-30 | 2005-04-26 | Abb Ab | Induction devices with distributed air gaps |
US6891303B2 (en) | 1996-05-29 | 2005-05-10 | Abb Ab | High voltage AC machine winding with grounded neutral circuit |
US6970063B1 (en) | 1997-02-03 | 2005-11-29 | Abb Ab | Power transformer/inductor |
US6972505B1 (en) | 1996-05-29 | 2005-12-06 | Abb | Rotating electrical machine having high-voltage stator winding and elongated support devices supporting the winding and method for manufacturing the same |
US6995646B1 (en) | 1997-02-03 | 2006-02-07 | Abb Ab | Transformer with voltage regulating means |
US7019429B1 (en) | 1997-11-27 | 2006-03-28 | Asea Brown Boveri Ab | Method of applying a tube member in a stator slot in a rotating electrical machine |
US7045704B2 (en) | 2000-04-28 | 2006-05-16 | Abb Ab | Stationary induction machine and a cable therefor |
US7046492B2 (en) | 1997-02-03 | 2006-05-16 | Abb Ab | Power transformer/inductor |
US7061133B1 (en) | 1997-11-28 | 2006-06-13 | Abb Ab | Wind power plant |
US7141908B2 (en) | 2000-03-01 | 2006-11-28 | Abb Ab | Rotating electrical machine |
US20200243249A1 (en) * | 2019-01-28 | 2020-07-30 | Murata Manufacturing Co., Ltd. | Coil component |
US20210134508A1 (en) * | 2019-10-30 | 2021-05-06 | Infineon Technologies Ag | Circuit with transformer and corresponding method |
-
1929
- 1929-05-29 US US367093A patent/US1781308A/en not_active Expired - Lifetime
Cited By (46)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2654058A (en) * | 1948-12-22 | 1953-09-29 | Frank H Mcintosh | Wide band transformer |
US3168715A (en) * | 1962-06-27 | 1965-02-02 | Gen Electric | Trifilar wound hybrid transformer |
US3428920A (en) * | 1966-11-29 | 1969-02-18 | Adams Russel Co Inc | N-way electrical power divider wherein n is an odd number |
US4484974A (en) * | 1983-06-27 | 1984-11-27 | Loral Corporation | Multiple layer coil winding system |
US4635019A (en) * | 1984-08-21 | 1987-01-06 | Tdk Corporation | Coil apparatus with divided windings |
US6919664B2 (en) | 1996-05-29 | 2005-07-19 | Abb Ab | High voltage plants with electric motors |
US6940380B1 (en) | 1996-05-29 | 2005-09-06 | Abb Ab | Transformer/reactor |
US6936947B1 (en) | 1996-05-29 | 2005-08-30 | Abb Ab | Turbo generator plant with a high voltage electric generator |
US6577487B2 (en) | 1996-05-29 | 2003-06-10 | Asea Brown Boveri Ab | Reduction of harmonics in AC machines |
US6906447B2 (en) | 1996-05-29 | 2005-06-14 | Abb Ab | Rotating asynchronous converter and a generator device |
US6376775B1 (en) | 1996-05-29 | 2002-04-23 | Abb Ab | Conductor for high-voltage windings and a rotating electric machine comprising a winding including the conductor |
US6972505B1 (en) | 1996-05-29 | 2005-12-06 | Abb | Rotating electrical machine having high-voltage stator winding and elongated support devices supporting the winding and method for manufacturing the same |
US6417456B1 (en) | 1996-05-29 | 2002-07-09 | Abb Ab | Insulated conductor for high-voltage windings and a method of manufacturing the same |
US6894416B1 (en) | 1996-05-29 | 2005-05-17 | Abb Ab | Hydro-generator plant |
US6891303B2 (en) | 1996-05-29 | 2005-05-10 | Abb Ab | High voltage AC machine winding with grounded neutral circuit |
US6831388B1 (en) | 1996-05-29 | 2004-12-14 | Abb Ab | Synchronous compensator plant |
US6822363B2 (en) | 1996-05-29 | 2004-11-23 | Abb Ab | Electromagnetic device |
US6396187B1 (en) | 1996-11-04 | 2002-05-28 | Asea Brown Boveri Ab | Laminated magnetic core for electric machines |
US6369470B1 (en) | 1996-11-04 | 2002-04-09 | Abb Ab | Axial cooling of a rotor |
US6261437B1 (en) | 1996-11-04 | 2001-07-17 | Asea Brown Boveri Ab | Anode, process for anodizing, anodized wire and electric device comprising such anodized wire |
US6279850B1 (en) | 1996-11-04 | 2001-08-28 | Abb Ab | Cable forerunner |
US7046492B2 (en) | 1997-02-03 | 2006-05-16 | Abb Ab | Power transformer/inductor |
US6970063B1 (en) | 1997-02-03 | 2005-11-29 | Abb Ab | Power transformer/inductor |
US6828701B1 (en) | 1997-02-03 | 2004-12-07 | Asea Brown Boveri Ab | Synchronous machine with power and voltage control |
US6465979B1 (en) | 1997-02-03 | 2002-10-15 | Abb Ab | Series compensation of electric alternating current machines |
US6995646B1 (en) | 1997-02-03 | 2006-02-07 | Abb Ab | Transformer with voltage regulating means |
US6825585B1 (en) | 1997-02-03 | 2004-11-30 | Abb Ab | End plate |
US6646363B2 (en) | 1997-02-03 | 2003-11-11 | Abb Ab | Rotating electric machine with coil supports |
US6439497B1 (en) | 1997-02-03 | 2002-08-27 | Abb Ab | Method and device for mounting a winding |
US6429563B1 (en) | 1997-02-03 | 2002-08-06 | Abb Ab | Mounting device for rotating electric machines |
US6357688B1 (en) | 1997-02-03 | 2002-03-19 | Abb Ab | Coiling device |
US6873080B1 (en) | 1997-09-30 | 2005-03-29 | Abb Ab | Synchronous compensator plant |
US7019429B1 (en) | 1997-11-27 | 2006-03-28 | Asea Brown Boveri Ab | Method of applying a tube member in a stator slot in a rotating electrical machine |
US6525504B1 (en) | 1997-11-28 | 2003-02-25 | Abb Ab | Method and device for controlling the magnetic flux in a rotating high voltage electric alternating current machine |
WO1999028923A1 (en) * | 1997-11-28 | 1999-06-10 | Abb Ab | Transformer |
US6867674B1 (en) | 1997-11-28 | 2005-03-15 | Asea Brown Boveri Ab | Transformer |
US6525265B1 (en) | 1997-11-28 | 2003-02-25 | Asea Brown Boveri Ab | High voltage power cable termination |
US7061133B1 (en) | 1997-11-28 | 2006-06-13 | Abb Ab | Wind power plant |
US6801421B1 (en) | 1998-09-29 | 2004-10-05 | Abb Ab | Switchable flux control for high power static electromagnetic devices |
US7141908B2 (en) | 2000-03-01 | 2006-11-28 | Abb Ab | Rotating electrical machine |
US6885273B2 (en) | 2000-03-30 | 2005-04-26 | Abb Ab | Induction devices with distributed air gaps |
US7045704B2 (en) | 2000-04-28 | 2006-05-16 | Abb Ab | Stationary induction machine and a cable therefor |
US20200243249A1 (en) * | 2019-01-28 | 2020-07-30 | Murata Manufacturing Co., Ltd. | Coil component |
US11798729B2 (en) * | 2019-01-28 | 2023-10-24 | Murata Manufacturing Co., Ltd. | Coil component |
US20210134508A1 (en) * | 2019-10-30 | 2021-05-06 | Infineon Technologies Ag | Circuit with transformer and corresponding method |
US11923120B2 (en) * | 2019-10-30 | 2024-03-05 | Infineon Technologies Ag | Circuit with transformer and corresponding method |
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