CA1176704A - High-voltage transformer - Google Patents
High-voltage transformerInfo
- Publication number
- CA1176704A CA1176704A CA000380978A CA380978A CA1176704A CA 1176704 A CA1176704 A CA 1176704A CA 000380978 A CA000380978 A CA 000380978A CA 380978 A CA380978 A CA 380978A CA 1176704 A CA1176704 A CA 1176704A
- Authority
- CA
- Canada
- Prior art keywords
- coil
- winding
- coils
- wound
- cylindrical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/18—Rotary transformers
-
- 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
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/42—Flyback transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F5/00—Coils
- H01F5/02—Coils wound on non-magnetic supports, e.g. formers
- H01F2005/022—Coils wound on non-magnetic supports, e.g. formers wound on formers with several winding chambers separated by flanges, e.g. for high voltage applications
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Insulating Of Coils (AREA)
- Coils Of Transformers For General Uses (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
ABSTRACT:
A high-voltage transformer, comprising a ferro-magnetic core on which at least one primary winding and one secondary winding are provided, said secondary wind-ing consisting of a series of wire-wound cylindrical coils, each of which coaxially surrounds the preceding coil and is separated therefrom by a cylindrical insulating body, every two successive coil being electrically connected by a diode, all of said diodes being connected in the same rectifying sense and each coil consisting of a number of series-connected sub-coils. Each coil is wound on a dimensionally stable cylindrical coil former which also forms the insulating body and on the surface of which at least ten winding chambers are defined by means of circum-ferential ridges, the depth of said chambers preferably being at the most equal to their width.
A high-voltage transformer, comprising a ferro-magnetic core on which at least one primary winding and one secondary winding are provided, said secondary wind-ing consisting of a series of wire-wound cylindrical coils, each of which coaxially surrounds the preceding coil and is separated therefrom by a cylindrical insulating body, every two successive coil being electrically connected by a diode, all of said diodes being connected in the same rectifying sense and each coil consisting of a number of series-connected sub-coils. Each coil is wound on a dimensionally stable cylindrical coil former which also forms the insulating body and on the surface of which at least ten winding chambers are defined by means of circum-ferential ridges, the depth of said chambers preferably being at the most equal to their width.
Description
'7~ '~
.~
PIIN 97~3 l 19.1.1981 High-voltage transformer.
The invention relates to a high-voltage trans-former, comprising a ferromagnetic core on which at least one primary winding and one secondary winding are pro-vided, said secondary winding consisting of a plurality of wire-wound cylindrical coils, each successive coil co-axially surrounding the preceding coil and being separated therefrom by a cylindrical insulating member, each pair of successive coils being electrically interconnected by a diode 5 all of said diodes b0ing poled in the same rectifying sense and each coil consisting of a number of series-connected sub-coils.
A high-voltage transformer of this k:ind is known from Netherlands Patent Application 771311~ (PHN
8970) laid open to public inspection. The division of the coils into sub-coils serves to compose each coil from more then one winding layer, so that either the number of coils constituting the secondary winding (and hence also the number of diod0s required) may be smaller or each coil may be shorter~ so that the dimensions of the ferromagnetic coil may be smaller. The cost of the transformar is re-duced in both cases.
It is a drawback of the known transformer con-struction that the manufacturing process is comparatively complex, because a special winding method has to be used and also because an insulating foil must be provided after the winding of each coil in order to insulate the coil from the next soil.
It is an object of the invention to provide a construction which enables a simpler and hence cheaper and more reliable manufacturing process, while the ad-vantages of the known construction are maintained.
To this end, -the high-voltage transformer in `
, - , .
.
:L ~ O ~
PHN 9783 2 19.1.1981 accordance wi-th the invention is characterized in that each coil is wound on a dimensionally stable cylindrical coil former which between successive coils also ~orms the insulating member~ circumferential ridg0s OIl the surface of each former defining a-t least ten winding chambers, in each of which a separate sub-coil is wound.
Preferably, the depth of the winding chambers at -the most equals the width.
This construction enables each coil to be separately wound on a coil former of its own without special steps being required during the winding of each sub-coil, after which the coil formers are simply slid into one anotherO The ridges prevent damaging the windings during this sliding movement. I~ desirable, -the entire secondary winding can be impregnated with a synthe tic material after assembly, possibly in combination with the primary winding. In order to ensure tha-t the syn-thetic material oan readily penetra-te between the turns o~ the secondary coils, a preferred embodiment o-~
the transformer in accordance with the invention ischaracterized in that each of the circumferential ridges has an interruption in at least two locations.
The invention will be described in detail here-inafter by way of example with reference to the accom-panying drawing.
Therein:
Figure 1 is a diagrammatic view of the con-struc-tion o~ an embodiment of a high-voltage trans-former in accordance with the invention~
3~ Figure 2 shows an electrical diagram of the high-voltage transformer shown in Figure 1, Figure 3 is a longitudinal sectional view on an increased scale of the secondary winding of the high-voltage trans~ormer shown in Figure 1, and Figure ~ is a cross-sectional view of the winding shown in Figure 3.
The high-voltage transformer shown in the PHN 97~3 3 19.1.19~1 Figures 1 and 2 (~or example, a line output trans~ormer ~or a television receiver) comprises a ferromagnetic core 1 which consists o~ two U-shaped portions and which supports a primary winding 3 and a secondary winding 5.
The secondary winding 5 o~ the em'bodiment shown in Figure 1 is coaxially arranged about the primary winding 3, but the primary winding may al-ternatively be provided on another limb o~ the core; underneath the secondary winding a coupling winding may be provided, i~ desirable.
The secondary winding 5 is composed (see also Figure 2) of a series o~ wire-wound cylindrical coils 7 (in this case three coils), each o~ which coaxially surrounds the preceding coil. A cylindrical insulating member (not shown in the Figures 1 and 2) is provided be-tween adjacent coils 7. Sucoessive pairs o~ coils are electrically connec-ted by a diode 9~ all o~ said diodes being poled in the same recti~ying sense as appears ~rom Figure 2. The last coil 7 is connected to an output connection 13 via a diode 11 which is connected in the same rectifying sense. The diode~9 and 11 are moun-ted on a diode holder 'l5 which is arranged on the secondary winding 5 and are conduc-tively connected to the coils via wires 17. The complete assembly ~ormed by -t~e secondary winding and the diodes is preferably moulde'~ in a synthetic resin (not shown). Because the coils 7 are coaxially arranged over one another~ they have a given capacitance wi-th respect to each other; this is symboli~ed by the capacitors 19 (denoted by broken lines) in Figure
.~
PIIN 97~3 l 19.1.1981 High-voltage transformer.
The invention relates to a high-voltage trans-former, comprising a ferromagnetic core on which at least one primary winding and one secondary winding are pro-vided, said secondary winding consisting of a plurality of wire-wound cylindrical coils, each successive coil co-axially surrounding the preceding coil and being separated therefrom by a cylindrical insulating member, each pair of successive coils being electrically interconnected by a diode 5 all of said diodes b0ing poled in the same rectifying sense and each coil consisting of a number of series-connected sub-coils.
A high-voltage transformer of this k:ind is known from Netherlands Patent Application 771311~ (PHN
8970) laid open to public inspection. The division of the coils into sub-coils serves to compose each coil from more then one winding layer, so that either the number of coils constituting the secondary winding (and hence also the number of diod0s required) may be smaller or each coil may be shorter~ so that the dimensions of the ferromagnetic coil may be smaller. The cost of the transformar is re-duced in both cases.
It is a drawback of the known transformer con-struction that the manufacturing process is comparatively complex, because a special winding method has to be used and also because an insulating foil must be provided after the winding of each coil in order to insulate the coil from the next soil.
It is an object of the invention to provide a construction which enables a simpler and hence cheaper and more reliable manufacturing process, while the ad-vantages of the known construction are maintained.
To this end, -the high-voltage transformer in `
, - , .
.
:L ~ O ~
PHN 9783 2 19.1.1981 accordance wi-th the invention is characterized in that each coil is wound on a dimensionally stable cylindrical coil former which between successive coils also ~orms the insulating member~ circumferential ridg0s OIl the surface of each former defining a-t least ten winding chambers, in each of which a separate sub-coil is wound.
Preferably, the depth of the winding chambers at -the most equals the width.
This construction enables each coil to be separately wound on a coil former of its own without special steps being required during the winding of each sub-coil, after which the coil formers are simply slid into one anotherO The ridges prevent damaging the windings during this sliding movement. I~ desirable, -the entire secondary winding can be impregnated with a synthe tic material after assembly, possibly in combination with the primary winding. In order to ensure tha-t the syn-thetic material oan readily penetra-te between the turns o~ the secondary coils, a preferred embodiment o-~
the transformer in accordance with the invention ischaracterized in that each of the circumferential ridges has an interruption in at least two locations.
The invention will be described in detail here-inafter by way of example with reference to the accom-panying drawing.
Therein:
Figure 1 is a diagrammatic view of the con-struc-tion o~ an embodiment of a high-voltage trans-former in accordance with the invention~
3~ Figure 2 shows an electrical diagram of the high-voltage transformer shown in Figure 1, Figure 3 is a longitudinal sectional view on an increased scale of the secondary winding of the high-voltage trans~ormer shown in Figure 1, and Figure ~ is a cross-sectional view of the winding shown in Figure 3.
The high-voltage transformer shown in the PHN 97~3 3 19.1.19~1 Figures 1 and 2 (~or example, a line output trans~ormer ~or a television receiver) comprises a ferromagnetic core 1 which consists o~ two U-shaped portions and which supports a primary winding 3 and a secondary winding 5.
The secondary winding 5 o~ the em'bodiment shown in Figure 1 is coaxially arranged about the primary winding 3, but the primary winding may al-ternatively be provided on another limb o~ the core; underneath the secondary winding a coupling winding may be provided, i~ desirable.
The secondary winding 5 is composed (see also Figure 2) of a series o~ wire-wound cylindrical coils 7 (in this case three coils), each o~ which coaxially surrounds the preceding coil. A cylindrical insulating member (not shown in the Figures 1 and 2) is provided be-tween adjacent coils 7. Sucoessive pairs o~ coils are electrically connec-ted by a diode 9~ all o~ said diodes being poled in the same recti~ying sense as appears ~rom Figure 2. The last coil 7 is connected to an output connection 13 via a diode 11 which is connected in the same rectifying sense. The diode~9 and 11 are moun-ted on a diode holder 'l5 which is arranged on the secondary winding 5 and are conduc-tively connected to the coils via wires 17. The complete assembly ~ormed by -t~e secondary winding and the diodes is preferably moulde'~ in a synthetic resin (not shown). Because the coils 7 are coaxially arranged over one another~ they have a given capacitance wi-th respect to each other; this is symboli~ed by the capacitors 19 (denoted by broken lines) in Figure
2.
Figure 3 is a longitudinal sectional view of the secondary winding 5 which shows that each of the coils 7 is wound on a cylindrical coil ~ormer 21 which is made o~ a suitable synthetic material~ ~or example, by injec-tion moulding. Consequently, the coil ~ormers are di-mensionally sta'ble and each coil former can be separately provided with a coil 7 in a winding machine, after which they are arranged coaxially over one another. The insu-lating body between adjacent coils is then ~ormed by the PHN 9783 4 19. 1 . 1981 coil former of the outer one of these two coils.
Each coil former 21 comprises a large number of circumferential ridges 23 which define winding chambers 25 on the surface of the coil former. A sub-coil 27 is wound in each winding chamber 25. All sub-coils 27 on a coil former 21 are connected in series and -together they form one coil 7. For the sake of simplicity, Figure
Figure 3 is a longitudinal sectional view of the secondary winding 5 which shows that each of the coils 7 is wound on a cylindrical coil ~ormer 21 which is made o~ a suitable synthetic material~ ~or example, by injec-tion moulding. Consequently, the coil ~ormers are di-mensionally sta'ble and each coil former can be separately provided with a coil 7 in a winding machine, after which they are arranged coaxially over one another. The insu-lating body between adjacent coils is then ~ormed by the PHN 9783 4 19. 1 . 1981 coil former of the outer one of these two coils.
Each coil former 21 comprises a large number of circumferential ridges 23 which define winding chambers 25 on the surface of the coil former. A sub-coil 27 is wound in each winding chamber 25. All sub-coils 27 on a coil former 21 are connected in series and -together they form one coil 7. For the sake of simplicity, Figure
3 shows only three sub-coils 27 per coil former 21. No special requirements are imposed as regards the winding of the sub-coils 27, and the series connection of the sub~coils is very simply realized by feeding the winding wire, after deposition of the required number of turns in a chamber, via a narrow slit or gap (not shown) in the intermediate circumferential ridge, to the next chamber where winding is continued.
The capacitance 19 between two successive coils 7 depends mainly on the wall thickness and the material of the coil formers 21 and on the height of the ridges 23. In order to realize a sufficiently high capacitance, the depth of the winding chambers 25 preferably should not exceed their width. In order to reduce the number of turns to be accommodated in a winding chamber, th0 number of winding chambers should exceed ten. An excessive number of turns in a winding chamber imposes the risk that the voltage difference between neighbouring turns can no longer be withstood by the insulation of the winding wire.
In a practical embodiment, each coil former 21 comprises twenty winding chambers 25 with a depth of O. 5 mm and a width of 1 mm. The thickness of the ridges 23 is O. 5 mm and each winding chamber accommodates 45 turns of wire having a thickness of O.O9 mm (in five layers), Figure 4 is a cross-sectional view of the secondary winding which shows that the circumferential ridges 23 are interrupted in four locations by interrupt-ion 29. These interruptions facilitate the penetration of 1~ ~'7~
PHN 9783 5 19.1.1981 an impregna-ting medium (for example, epoxy resin) with which the secondary winding is impregnated, if desired.
The number of interruptions 29 depends inter alia on the dimensions of the secondary winding 5 and on the number of coil formers 21. For thorough penetration of the impregna-~ng medium, this number of interruptions should at least be two.
The capacitance 19 between two successive coils 7 depends mainly on the wall thickness and the material of the coil formers 21 and on the height of the ridges 23. In order to realize a sufficiently high capacitance, the depth of the winding chambers 25 preferably should not exceed their width. In order to reduce the number of turns to be accommodated in a winding chamber, th0 number of winding chambers should exceed ten. An excessive number of turns in a winding chamber imposes the risk that the voltage difference between neighbouring turns can no longer be withstood by the insulation of the winding wire.
In a practical embodiment, each coil former 21 comprises twenty winding chambers 25 with a depth of O. 5 mm and a width of 1 mm. The thickness of the ridges 23 is O. 5 mm and each winding chamber accommodates 45 turns of wire having a thickness of O.O9 mm (in five layers), Figure 4 is a cross-sectional view of the secondary winding which shows that the circumferential ridges 23 are interrupted in four locations by interrupt-ion 29. These interruptions facilitate the penetration of 1~ ~'7~
PHN 9783 5 19.1.1981 an impregna-ting medium (for example, epoxy resin) with which the secondary winding is impregnated, if desired.
The number of interruptions 29 depends inter alia on the dimensions of the secondary winding 5 and on the number of coil formers 21. For thorough penetration of the impregna-~ng medium, this number of interruptions should at least be two.
Claims (2)
1. A high-voltage transformer, comprising a ferro-magnetic core on which at least one primary winding and one secondary winding are provided, said secondary winding consisting of a plurality of wire-wound cylindrical coils, each successive coil coaxially surrounding the preceding coil and being separated therefrom by a cylindrical insula-ting member, each pair of successive coils having a given capacitance with respect to each other and being electri-cally inter-connected by a diode, all of said diodes being poled in the same rectifying sense and each coil consisting of a number of series-connected sub-coils, each comprising at least two layers of turns, characterized in that each coil is wound on a dimensionally stable cylindrical coil former which, between successive coils, also forms the insulating member, circumferential ridges on the surface of each former defining at least ten winding chambers, in each of which a separate sub-coil is wound.
2. A high-voltage transformer as claimed in Claim 1, characterized in that the depth of each of the winding chambers at the most equals its width.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8003852 | 1980-07-03 | ||
| NL8003852A NL8003852A (en) | 1980-07-03 | 1980-07-03 | HIGH VOLTAGE TRANSFORMER. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1176704A true CA1176704A (en) | 1984-10-23 |
Family
ID=19835558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000380978A Expired CA1176704A (en) | 1980-07-03 | 1981-07-02 | High-voltage transformer |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0043615B1 (en) |
| JP (2) | JPS5745212A (en) |
| AU (1) | AU543541B2 (en) |
| CA (1) | CA1176704A (en) |
| DE (1) | DE3167432D1 (en) |
| ES (1) | ES503585A0 (en) |
| NL (1) | NL8003852A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4675639A (en) * | 1985-05-10 | 1987-06-23 | Rca Corporation | Transformer assembly and winding therefor |
| DE8519972U1 (en) * | 1985-07-10 | 1985-08-29 | Siemens AG, 1000 Berlin und 8000 München | Electrical connector strip |
| FR2775383B1 (en) * | 1998-02-25 | 2000-05-05 | Siraga Sa | ROTATING TRANSFORMER COMPRISING A FIXED BODY AND A ROTATING BODY ARRANGED ONE IN FRONT OF THE OTHER |
| US6552641B1 (en) * | 1999-07-27 | 2003-04-22 | Thomson Licensing S.A. | Transformer, especially for powering cathode ray tubes |
| RU2482562C2 (en) * | 2010-07-09 | 2013-05-20 | В & С Ворлд Ко. Лтд | Hv pulse coreless transformer |
| US10790077B2 (en) | 2017-10-31 | 2020-09-29 | Waymo Llc | Devices and methods for an electromagnetic coil |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5138046B2 (en) * | 1971-11-18 | 1976-10-19 | ||
| US3843903A (en) * | 1972-06-22 | 1974-10-22 | Matsushita Electric Ind Co Ltd | High voltage generator |
| NL159223C (en) * | 1973-10-10 | |||
| IT1023916B (en) * | 1974-11-11 | 1978-05-30 | Aes Applic Elettron Spa | POWER SUPPLY DEVICE, STAT REDUCER, CO WITH INVERTER AND FORCED VENTILATION, ESPECIALLY SUITABLE FOR HIGH FREQUEIZA ACCHE ELECTRIC WELDING |
| JPS5317447U (en) * | 1976-07-23 | 1978-02-14 | ||
| US4204263A (en) * | 1977-04-20 | 1980-05-20 | Denki Onkyo Co., Ltd. | Flyback transformer |
| JPS541006A (en) * | 1977-06-06 | 1979-01-06 | Ricoh Co Ltd | Magnetic recorder-reproducer |
| US4229786A (en) * | 1977-09-26 | 1980-10-21 | Murata Manufacturing Co., Inc. | Fly-back transformer with a low ringing ratio |
| NL7713118A (en) * | 1977-11-29 | 1979-05-31 | Philips Nv | HIGH VOLTAGE TRANSFORMER. |
-
1980
- 1980-07-03 NL NL8003852A patent/NL8003852A/en not_active Application Discontinuation
-
1981
- 1981-06-19 DE DE8181200697T patent/DE3167432D1/en not_active Expired
- 1981-06-19 EP EP19810200697 patent/EP0043615B1/en not_active Expired
- 1981-06-30 AU AU72409/81A patent/AU543541B2/en not_active Ceased
- 1981-06-30 JP JP56102202A patent/JPS5745212A/en active Pending
- 1981-07-01 ES ES503585A patent/ES503585A0/en active Granted
- 1981-07-02 CA CA000380978A patent/CA1176704A/en not_active Expired
-
1988
- 1988-03-15 JP JP3329488U patent/JPS63145311U/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5745212A (en) | 1982-03-15 |
| NL8003852A (en) | 1982-02-01 |
| DE3167432D1 (en) | 1985-01-10 |
| EP0043615B1 (en) | 1984-11-28 |
| AU543541B2 (en) | 1985-04-26 |
| AU7240981A (en) | 1982-01-07 |
| ES8204873A1 (en) | 1982-05-16 |
| ES503585A0 (en) | 1982-05-16 |
| EP0043615A1 (en) | 1982-01-13 |
| JPS63145311U (en) | 1988-09-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |