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US3345595A - High-voltage coil for generating the high voltage in a television receiver - Google Patents

High-voltage coil for generating the high voltage in a television receiver Download PDF

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Publication number
US3345595A
US3345595A US478067A US47806765A US3345595A US 3345595 A US3345595 A US 3345595A US 478067 A US478067 A US 478067A US 47806765 A US47806765 A US 47806765A US 3345595 A US3345595 A US 3345595A
Authority
US
United States
Prior art keywords
core
winding
voltage
carrier
opening
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 - Lifetime
Application number
US478067A
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English (en)
Inventor
Robel Heinz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Application granted granted Critical
Publication of US3345595A publication Critical patent/US3345595A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/10—Single-phase transformers
    • 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
    • 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
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/15—Bag fasteners
    • Y10T24/155—Resilient slot bag tie

Definitions

  • the present invention relates to an electrical device, and, more particularly, to a high-voltage coil whose winding is carried by a carrier, especially a high-voltage coil for use as the sweep transformer in a television receiver.
  • a high-voltage coil usually comprises a ferrite or iron core which passes through a central opening of the coil carrier.
  • One way of preventing such arc-overs is to provide a large number of insulating layers between the inner surface of the windingthe same having the shape of a hollow cylinderand the surface of the core. This way of preventing arc-overs, however, has the drawback that it entails additional costs, besides not affording any truly reliable protection against arc-overs.
  • Another way of preventing such arc-overs is to provide a metal surface, for example, a perforated copper foil, at the wall of the central opening of the coil carrier. This metal foil lies directly against the inner wall. In this way, there will be no air gap between the winding and the metal cylinder which itself is at ground potential, and there will be no voltage across the metal cylinder and the core which could lead to arc-overs.
  • This way of preventing arc-overs is also an expensive solution for the problem at hand, one reason for this being that much meticulous work is needed to apply the metal foil. Also, care has to be taken that the foil lies snugly against the coil carrier at all points.
  • Still another way in which arc-overs have been sought to be avoided involves coating or spraying a conductive layer onto the wall of the inner opening, for example, a conductive graphite layer which is grounded by a suitable connection so that there will be no difference in potential between this layer and the core.
  • a conductive layer onto the wall of the inner opening
  • a conductive graphite layer which is grounded by a suitable connection so that there will be no difference in potential between this layer and the core.
  • the core and the winding could be molded together in one plastic body, and this would eliminate air gaps between the coil and the core and therefore the strong electric fields that could arise in such air gaps.
  • the practical drawback of this solution is that, especially in the case of a high-voltage transformer for use in television receivers, the core has to be adjustable. Were the core to be cast in with the carrier and winding, and were the requisite air gap in the magnetic circuit between the two halves of the core not absolutely precise, the massproduction of this item would, if there were no way in which to adjust the air gap subsequent to the casting step, inevitably result in an excessively high number of rejects.
  • the primary object of the present invention to overcome the drawbacks of the prior art by providing an uncomplicated way in which to reduce the 3,345,595 Patented Oct. 3, 1967 danger of arc-overs between the winding and the core of a high-voltage coil, and, with this object in view, the present invention resides, basically, in a high-voltage coil, incorporating a carrier and a core passing through this carrier, in which a basically very simple means, namely, an air gap, is provided for preventing arc-overs between the winding and the core.
  • the present invention resides in a high-voltage coil which comprises a carrier having an opening and carrying a winding, and a core passing through this opening of the carrier, there being, in the region of the win-ding, an air gap between the inner wall of the carrier and the outer surface of the core, the thickness of this air gap being such that the air gap forms an insulating means for preventing arc-overs between the winding and the core.
  • the winding carrier is annular and has a central opening, especially a cylindrical opening, through which the core passes.
  • FIGURE 1 is a circuit showing the serial connection of three capacitors, this circuit being referred to in the course of an explanation of the theoretical aspects underlying the present invention.
  • FIGURE 2 is a sectional view of a high-voltage coil according to the present invention.
  • insulating media which are located between the core and the winding, and among these insulating media is a narrow air gap between the inner wall of the winding carrier and the core.
  • Such an air gap has to be there in any event, in order to provide some tolerance in the dimensions of the core thereby to make it possible for the core to be passed through the carrier. It is this air gap which is the most dangerous for the above-mentioned arc-overs.
  • the stack of insulating materials between the core and the winding can be considered as a series-circuit of capacitors C C C shown in FIGURE 1, each having its own respective dielectric constant k, its respective plate area A in square meters, and its respective thickness d in meters, this being the distance between the plates of the capacitor.
  • the capacitance C, in farads, of each capacitor is therefore Ako where s is the permittivity of empty space with the numerical value 8.85 X10 coul. /newton-m.
  • the number of these capacitors is the same throughout the length of the winding. Since the same current i flows through all of these capacitors, all of the capacitors will, after a time interval 1, carry the same charge Q. From this, the following equation can be derived:
  • Equation 1 can also be established in the following purely mathematical manner:
  • the air gap in accordance with the present invention, is not made as small as possible, but is intentionally enlarged to a definite value. It is thus apparent from Equation 5 that an air gap of 1 mm. has the same effect as increasing by 4 mm. the thickness of the winding carrier which itself is made of insulating material.
  • FIGURE 2 shows a practical embodiment of a highvoltage coil according to the present invention, the same including a winding 1 molded to a winding carrier 2 which has the shape of a hollow cylinder and a wall thickness of, for example, 2 mm.
  • the carrier 2 also has a central cylindrical opening 3 and is provided, near the lower end of this opening 3, with an inwardly directed annular shoulder 4 so as to form a constriction 4a.
  • a sleeve 5, which itself is provided with an opening, is set into the upper end of the opening 3 so that here, too, the opening 3 is constricted as shown at 5a.
  • a cylindrical core 6 passes through the opening 3. As shown in FIG- URE 2, the inner diameter of the opening 3 is greater than the outer diameter of the core 6.
  • the core 6 is held in place by the shoulder 4 and sleeve 5 such-that an air gap 7 is formed between the inner wall 3a of the opening 3 and the outer surface 6a of the core 6.
  • the thickness d of the air gap is such that it forms an insulating means for preventing arc-overs between the winding 1 and the core 6.
  • each of the constrictions is spaced from the limit plane nearest to it, as shown by the spacing between the planes a and the planes b which are also at right angles to the axis of the central opening and which are the planes within which lie the inner ends of the shoulder 4 and sleeve 5. In this way, the air gap 7 will be located in the region of the winding 1.
  • FIGURE 2 also shows a branch of the core 6 as being at right angles to the branch of the core which passes through the opening 3.
  • This right-angle branch, identified at 6', passes under the left-hand portion of the carrier 2. Accordingly, the bottom face of the carrier 2 has a recess so that also in this region of the winding 1 will there be an air gap 8 between the surface of the carrier 2 and the core.
  • a high-voltage coil for generating the high voltage in a television receiver comprising, in combination:
  • annular carrier having an inner wall defining a central opening and carrying a winding surrounding said opening, said winding being located between two limit planes which are at right angles to the axis of said central opening;

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Details Of Television Scanning (AREA)
US478067A 1964-08-08 1965-08-09 High-voltage coil for generating the high voltage in a television receiver Expired - Lifetime US3345595A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET26762A DE1296666B (de) 1964-08-08 1964-08-08 Halterung fuer die Hochspannungsspule eines Zeilenablenktransformators in einem Fernsehempfaenger

Publications (1)

Publication Number Publication Date
US3345595A true US3345595A (en) 1967-10-03

Family

ID=7553035

Family Applications (1)

Application Number Title Priority Date Filing Date
US478067A Expired - Lifetime US3345595A (en) 1964-08-08 1965-08-09 High-voltage coil for generating the high voltage in a television receiver

Country Status (4)

Country Link
US (1) US3345595A (de)
AT (1) AT257712B (de)
DE (1) DE1296666B (de)
GB (1) GB1115046A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4030449A1 (de) * 2021-01-18 2022-07-20 Delta Electronics (Shanghai) Co., Ltd. Magnetisches element

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1922593A (en) * 1930-12-29 1933-08-15 Leiva Gaspar Electrical transformer
US2825849A (en) * 1954-06-29 1958-03-04 Rca Corp Cathode ray tube deflection and high voltage apparatus
US3091725A (en) * 1958-08-28 1963-05-28 American Radiator & Standard Electro-magnetic device
US3141115A (en) * 1960-01-20 1964-07-14 Parker Hannifin Corp Solenoid mounting for valve operating mechanism

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1485289A (en) * 1922-04-20 1924-02-26 Gen Electric Electric coil and method of making same
US2062014A (en) * 1936-02-08 1936-11-24 Piffath Peter Induction coil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1922593A (en) * 1930-12-29 1933-08-15 Leiva Gaspar Electrical transformer
US2825849A (en) * 1954-06-29 1958-03-04 Rca Corp Cathode ray tube deflection and high voltage apparatus
US3091725A (en) * 1958-08-28 1963-05-28 American Radiator & Standard Electro-magnetic device
US3141115A (en) * 1960-01-20 1964-07-14 Parker Hannifin Corp Solenoid mounting for valve operating mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4030449A1 (de) * 2021-01-18 2022-07-20 Delta Electronics (Shanghai) Co., Ltd. Magnetisches element

Also Published As

Publication number Publication date
GB1115046A (en) 1968-05-22
AT257712B (de) 1967-10-25
DE1296666B (de) 1969-06-04

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