US3766500A - Radio noise filter - Google Patents

Radio noise filter Download PDF

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Publication number
US3766500A
US3766500A US00160667A US3766500DA US3766500A US 3766500 A US3766500 A US 3766500A US 00160667 A US00160667 A US 00160667A US 3766500D A US3766500D A US 3766500DA US 3766500 A US3766500 A US 3766500A
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United States
Prior art keywords
casing
capacitor element
capacitor
noise filter
choke coil
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
US00160667A
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English (en)
Inventor
Lykke G Larsen
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Individual
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Individual
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H1/0007—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network of radio frequency interference filters

Definitions

  • auxiliary terminals are UNITED STATES PATENTS provided in each of the end pieces and the choke coils 1,972,268 9/1934 Lesh 333/79 X are connected between these auxiliary terminals which 3,506,936 4/ 1970 L005 et al. 333/79 are furthermore connected to the input and output 2,221,105 11/1940 Otto 333/79 terminals of the fil in any Suitable manner.
  • the present invention relates to a radio noise filter of the current lead-through type comprising a leadthrough capacitor or by-pass capacitor or capacitor combination accommodated in a casing, the two opposite ends of which consist of insulation material or have insulation pieces carrying input and output terminals for the current.
  • the two insulation pieces that carry the input and output terminals on noise filters of the type dealt with have to be sufficiently strong so as to be capable of withstanding the mechanical influences from the input and output conductors and, in addition, they will have to be of an insulation material which ignites only with difficulty, such as bakelite, bakelite laminate or similar material.
  • insulation pieces have to be carried or supported sufficiently securely so that they do not become detached when the filter is mounted or by influences from the input and output conductors of the apparatus to be fitted with the noise filter.
  • bakelized iron powder the mechanical strength of which is insufficient for them to have one end unsup ported, let alone to carry a terminal on this end.
  • Holders intended for collectively carrying several electrical components are known, but such holders, in their known form of construction, are incapable of safeguarding mechanically weak components against mechanical influences acting upon components andv holders. Moreover, their function requires them to be of insulation material and their complicated shape precludes their being fashioned by any methods other than moulding or pressing in materials of which thermosetting ones are the most suitable from a point of view of safety, for which reason their production is relatively slow and their production costs correspondingly high.
  • each of the insulating end pieces of the capacitor being provided with two auxiliary terminals, between which'two-choke coils are arranged and which are connected to the main terminals in such a way that the choke coils are, in a known manner, electrically sit-' uated between the input terminals of the noise filter and the capacitor or capacitor combination.
  • the choke coils are, in a known manner, electrically sit-' uated between the input terminals of the noise filter and the capacitor or capacitor combination.
  • the choke coils may be secured solely by means of the supply conductors or the noise filter may, in conformity with an embodiment according to the invention,
  • FIG. 1 shows an electrical circuit diagram with a noise filter according to the invention
  • FIG. 2 shows a noise filter according to the invention in side elevation
  • FIG. 3 shows the same noise filter seen from one end
  • FIG. 4 shows the same noise filter seen from the end after the removal of certain components
  • FIG. 5 shows a longitudinal section through the noise filter
  • FIG. 6 shows a section of the capacitor of the noise filter including a conductor in contact with one of the capacitor electrodes.
  • an electromotor M is shown which, via a noise filter capacitor C and two choke coils D is connected to mains terminals N, possibly via a switch (not shown).
  • the capacitor contains an auxiliary electrode that is connected to the capacitor casing which is indicated by a dotted curve.
  • the noise filter shown in FIGS. 2-4 which comprises those components which in FIG. 1 are indicated inside the rectangle denoted with S, has a cylindrical capacitor casing 1, in which a capacitor winding 2 is mounted.
  • a metal strip 3 is fitted, the ends of which are bent over, welded together and provided with a hole 4 which can be utilized when securing the noise filter on an electrical machine.
  • a cover 5 and 6, respectively, of insulation material is fitted around the capacitor casing.
  • cover 6 has been omitted so as to provide a clear view.
  • two projections 7,8 and 9,10, respectively, are arranged which terminate in resilient tags gripping around two choke coils 11 and 12 and thereby securing them.
  • capacitor casing l The ends of capacitor casing l are closed by discs of insulation material. Only one of these discs, 13, is'visible in the drawing. Each of the discs incorporates two contact spaces 14 and 15, as well as two soldering-flaps 16 and 17. Covers 5 and 6 are provided with apertures 18-21, through which spades l4 and 15 and soldering flaps l6 and 17 project. Moreover, covers 5 and 6 are provided with various projections and partitions 22-24, which are intended to ensure the necessary insulation between live parts.
  • those contact spades 14a and 15a which project over the end of the capacitor shown on the right-hand side of FIG. 2', and 5 are connected to two conductors 25 and 26 extending through capacitor winding 2 and which project from its'lefthand end and which, in their passage, each make contact with one ofthe capacitor electrodes 1 as more clearly shwon in FIG. 6.
  • one of the capacitor electrodes is designated 30 and the other one 31, whereas the insulation between the electrodes is designated 32.
  • the flat part of conductor 26 is shown in contact with the electrode 30.
  • Those portions of wires 25 and 26 which are located in the capacitor winding may tend to the right-hand end of the capacitor where they are connected to the two soldering flaps 16a, 17a.
  • soldering flaps l6 and 17 in insulation disc 13 at the left-hand end of the capacitor are connected to contact spades 14 and 15 mounted in the same disc.
  • the circuit shown inside rectangle S of FIG. 1 is hereby brought into being.
  • Soldering flaps l6 and 17 are expedient elements for establishing a connection to the choke coils. Projections 7-10 and the associated tags may be dispensed with, and the choke coils can be held solely by means of their supply conductors. in this case in particular will the soldering flaps be of relevance.
  • Wires 27 and 28 need not connect the left-hand ends of wires 25 and 26 to the soldering flaps at the righthand end of the capacitor, but can, instead, connect the soldering flaps at the right-hand end to the contact spades at the left-hand end, in which case wires 25 and 26 have to be connected to the soldering flaps at the left-hand end. There is no need for wires 27 and 28 to extend through a central hole in the capacitor winding, but they can be located outside same, possibly outside the capacitor casing. Wires 25 and 27 can be made up of one through wire. The same applies to wires 26 and 28.
  • the capacity of the capacitor winding is to all intents and purposes determined by the radio noise attenuation desired for the lower radio fre quencies, while the self-induction of the choke coils is of particular importance for the attenuation of higher frequencies.
  • the requisite capacity and self-induction values consequently depend upon the noise intensity and noise spectrum of the radio noise source.
  • the capacitor In actual practice it is not necessary in every case, in order to achieve satisfactory noise attenuation, for the capacitor to be a lead-through capacitor. There is then no need for connections 27 and 28 in the capacitor shown in FIGS.
  • a capacitor element surrounded by a cylindrical casing, said casing including insulation material, at least one choke coil positioned external to said casing and having one end connected to said capacitor element, connection terminals firmly anchored in said insulation material for connecting said choke coil and the capacitor element to conductors, external to said casing, the improvement comprising;
  • auxiliary terminals firmly anchored in the insulation v material and connecting said choke coil to said connection terminals.
  • a first auxiliary terminal electrically connects the other end of said choke coil to a first connection terminal and a second auxiliary terminal connects said one end of said choke coil to said capacitor element, said capacitor element being further connected to a second connection terminal.
  • the noise filter of claim 2 further including a second choke coil, additional holding means for maintaining said second choke coil in position outside said casing, third and fourth connection terminals and third and fourth auxiliary terminals anchored in said insulation material, said third auxiliary terminal electrically connecting said third connection terminal to one end of said second choke coil said fourth auxiliary terminal electrically connecting the other end of said second choke coil to said capacitor element, said capacitor element being connected to said fourth connection terminal.
  • said capacitor element comprises a wound capacitor having a central hole and two lead through conductors extending through said hole and electrically insulated form each other, said lead through conductors being electrically connected to said second and fourth auxiliary conductors respectively and said capacitor element.
  • said holding means includes resilient tabs for clamping and holding the choke coils.
  • the noise filter of claim 4 further including insulation covers disposed over said discs of insulating material.
  • a radio noise filter of the type comprised of a capacitor element encased in a protective casing said casing including insulating material and choke coils situated external to the casing and electrically connected to said capacitor element and additional circuitry through connection terminals anchored in said insulating material, the improvement comprising,
  • auxiliary terminals in addition to said connection terminals, anchored in said insulating material sad electrically connecting said choke coils to said connection terminals and the capcitor element, and holding means, including resilient taps, for maintaining the choke coils in position outside the cas-

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  • Filters And Equalizers (AREA)
US00160667A 1970-07-13 1971-07-08 Radio noise filter Expired - Lifetime US3766500A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK364070AA DK122989B (da) 1970-07-13 1970-07-13 Radiostøjfilter.

Publications (1)

Publication Number Publication Date
US3766500A true US3766500A (en) 1973-10-16

Family

ID=8125158

Family Applications (1)

Application Number Title Priority Date Filing Date
US00160667A Expired - Lifetime US3766500A (en) 1970-07-13 1971-07-08 Radio noise filter

Country Status (6)

Country Link
US (1) US3766500A (da)
DE (1) DE2050449C3 (da)
DK (1) DK122989B (da)
GB (1) GB1344939A (da)
NL (1) NL174209C (da)
SE (1) SE367108B (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6710673B1 (en) 1998-06-26 2004-03-23 Thomas Jokerst Return path noise reducer
US20080076356A1 (en) * 2006-09-27 2008-03-27 Conway Patrick R Wireless communication noise suppression system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006044304A1 (de) * 2006-09-16 2008-03-27 Pierburg Gmbh Anordnung einer Entstörschaltung für einen Gleichstrommotor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1972268A (en) * 1932-12-30 1934-09-04 Associated Electric Lab Inc Interference suppressor
US2073880A (en) * 1935-06-19 1937-03-16 Solar Mfg Corp Interference eliminating device
US2163775A (en) * 1937-04-19 1939-06-27 Rca Corp Radio frequency filter
US2221105A (en) * 1938-05-07 1940-11-12 Fides Gmbh Electric filter
US2939095A (en) * 1957-02-26 1960-05-31 Sprague Electric Co Line filter
US3267396A (en) * 1963-02-28 1966-08-16 Bird Electronic Corp High power filter
US3506936A (en) * 1967-04-03 1970-04-14 Motorola Inc Parallel plate feed-through capacitor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1972268A (en) * 1932-12-30 1934-09-04 Associated Electric Lab Inc Interference suppressor
US2073880A (en) * 1935-06-19 1937-03-16 Solar Mfg Corp Interference eliminating device
US2163775A (en) * 1937-04-19 1939-06-27 Rca Corp Radio frequency filter
US2221105A (en) * 1938-05-07 1940-11-12 Fides Gmbh Electric filter
US2939095A (en) * 1957-02-26 1960-05-31 Sprague Electric Co Line filter
US3267396A (en) * 1963-02-28 1966-08-16 Bird Electronic Corp High power filter
US3506936A (en) * 1967-04-03 1970-04-14 Motorola Inc Parallel plate feed-through capacitor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6710673B1 (en) 1998-06-26 2004-03-23 Thomas Jokerst Return path noise reducer
US20080076356A1 (en) * 2006-09-27 2008-03-27 Conway Patrick R Wireless communication noise suppression system
US8005429B2 (en) 2006-09-27 2011-08-23 Hewlett-Packard Development Company, L.P. Wireless communication noise suppression system

Also Published As

Publication number Publication date
SE367108B (da) 1974-05-13
DK122989B (da) 1972-05-01
DE2050449C3 (de) 1979-08-30
DE2050449A1 (de) 1972-01-20
NL174209C (nl) 1984-05-01
GB1344939A (en) 1974-01-23
DE2050449B2 (de) 1979-01-04
NL7109588A (da) 1972-01-17
NL174209B (nl) 1983-12-01

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