EP0302856B1 - Ferroresonante transformatoren mit konstanter spannung - Google Patents

Ferroresonante transformatoren mit konstanter spannung Download PDF

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Publication number
EP0302856B1
EP0302856B1 EP87901457A EP87901457A EP0302856B1 EP 0302856 B1 EP0302856 B1 EP 0302856B1 EP 87901457 A EP87901457 A EP 87901457A EP 87901457 A EP87901457 A EP 87901457A EP 0302856 B1 EP0302856 B1 EP 0302856B1
Authority
EP
European Patent Office
Prior art keywords
core
cores
wound
gap
magnetic circuit
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
EP87901457A
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English (en)
French (fr)
Other versions
EP0302856A1 (de
Inventor
Lorenzo Petrogalli
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.)
ELEKTRENE Srl
Original Assignee
ELEKTRENE Srl
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 ELEKTRENE Srl filed Critical ELEKTRENE Srl
Priority to AT87901457T priority Critical patent/ATE63648T1/de
Publication of EP0302856A1 publication Critical patent/EP0302856A1/de
Application granted granted Critical
Publication of EP0302856B1 publication Critical patent/EP0302856B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/04—Regulating voltage or current wherein the variable is ac
    • G05F3/06—Regulating voltage or current wherein the variable is ac using combinations of saturated and unsaturated inductive devices, e.g. combined with resonant circuit
    • 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

Definitions

  • the present invention relates to ferroresonant constant-voltage transformers. These are now widely used in order to obtain a stabilized voltage. These transformers are enjoying an increased sale on the market owing to the fact that many electronic products now in common use need a constant imput voltage in order to work properly.
  • GB-A-1-020.093 foresees a transformer having two cores: one with and the other without gap, both being provided with two adjacent portions on which the secondary winding is wound while the primary winding is wound only on the core's portion without gap, thus with a saturated magnetic circuit.
  • This arrangement is quite inefficient because an input voltage increment causes the current to rise while the magnetic permeability of the material is reduced tending to saturation. At this point the primary winding subjected to a very high current, produces an anomalous heating and thus excessive heat losses.
  • FR-A-2.140.038 shows two continuous cores (without gap) also having two adjacent portions on which a primary winding is wound.
  • a feed back secondary winding is also necessary for obtaining a constant voltage besides the main secondary winding. This complicates the construction and makes it more expensive and less reliable.
  • Aim of this invention is to carry out an improved ferroresonant transformer having a good efficiency, better than that of the present transformers, thus enabling considerable variations comprised between -50% and +30% obtaining output variations comprised within ⁇ 2%.
  • the proposed transformer is made up of two cores 10 and 20 each one comprising a single spiral wound core sheet strip that is cut in half to form two C-shaped portions respectively 15 and 16; 25 and 26. Both cores have a portion, respectively 11 and 21, that is adjacent to the other portion 11 or 21. Around both adjacent portions the transformer's primary P is wound. Around another section 22 of the saturated magnetic core 20 (without gap) the secondary S is wound.
  • Core 10 is made so as to work always in a linear magnetic field, whilst core 20 is made so as to work always with a saturated magnetic field. To do so, the facing surfaces of portions 25 and 26 of core 20 are lapped in a mirror-like way on their lacing surfaces 27, then they are drawn together so that in between portions 25 and 26 the gap is practically "zero".
  • Core 10, on which only the primary winding P is wound is instead provided with two gaps 18 between the two lacingsurfaces 17.
  • the total value of the two gaps is preferably comprised between 000,2 and 2 per thousand of the core's magnetic circuit, i.e. for a 20 W power the circuit is about 130 mm. and the two gaps' total value is 0,05 mm. equal to the 0,4 per thousand, for a 250 W power the magnetic circuit is about 260 mm. and the total value of the two gaps is 0,4 mm. equal to the 1,5 per thousand.
  • the extension of the magnetic field of core 10 is solely that strictly necessary for accomodating winding P.
  • the extension of core 20's magnetic circuit is on the contrary much greater particularly it is at least a 10% bigger than the magnetic field extension of core 10.
  • the two cores are preferably obtained by winding a magnetic core shaped as a continuous strip whose grains, as known, are positioned in the direction of lamination. This continuous strip is spiral wound starting from the inner winding's surface indicated with 13 and respectively with 23, and continuing until the outside surface, indicated respectively with 14 and 24 is reached. Each annular core is then cut in half thus forming two portions having opposed facing surfaces 17 and 27.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Coils Or Transformers For Communication (AREA)

Claims (2)

1. Ferroresonanter Trasformator mit zwei getrennten ringförmigen Kernen (10, 20), die jeweils aus zwei C-förmigen Teilen bestehen, die durch Trennen eines einzelnen Kerns, der aus einem zur Spirale aufgewickelten Streifen besteht, erhalten werden, wobei die beiden C-förmigen Teile jedes ringförmigen Kerns entgegengesetzte, gegenüberliegende Flächen (17, 27) aufweisen, einer (10) der beiden Kerne mit einem Luftspalt (18) versehen ist, der ihn im linearen Magnetfeld arbeiten läßt, während der andere Kern (20) keinen Luftspalt aufweist, weshalb sein Magnetkreis gesättigt ist; die beiden Kerne haben benachbarte Teile (11, 12), um die die Primärspule gewickelt ist, während eine Sekundärspule um einen Teil eines der beiden von der Primärspule entfernten Kerns gewickelt ist, wobei die beiden Kerne (10, 20) verschiedene Magnetkreise haben, dadurch gekennzeichnet, daß die Sekundärspule (S) auf den Kern (20) gewickelt wird, der keinen Luftspalt hat und daß die entgegengesetzten gegenüberliegenden ringförmigen Flächen dieses Kerns (20) durch Läppen geformt werden.
2. Transformator nach Anspruch 1, dadurch gekennzeichnet, daß der gesamte Luftspalt (17 + 17) zwischen den beiden Halbkernen (15, 16) zwischen 1 und 5 vom Tausend der Erstreckung des Magnetkreises liegt.
EP87901457A 1986-02-28 1987-02-24 Ferroresonante transformatoren mit konstanter spannung Expired - Lifetime EP0302856B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87901457T ATE63648T1 (de) 1986-02-28 1987-02-24 Ferroresonante transformatoren mit konstanter spannung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1960086 1986-02-28
IT19600/86A IT1190079B (it) 1986-02-28 1986-02-28 Perfezionamenti ai trasformatori a ferro-risonanza (ferroresonant constant-voltage transformer)

Publications (2)

Publication Number Publication Date
EP0302856A1 EP0302856A1 (de) 1989-02-15
EP0302856B1 true EP0302856B1 (de) 1991-05-15

Family

ID=11159362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87901457A Expired - Lifetime EP0302856B1 (de) 1986-02-28 1987-02-24 Ferroresonante transformatoren mit konstanter spannung

Country Status (4)

Country Link
EP (1) EP0302856B1 (de)
AU (1) AU7125387A (de)
IT (1) IT1190079B (de)
WO (1) WO1987005412A1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1149809B (de) * 1961-05-12 1963-06-06 Frako Kondensatoren Und Appbau Stabilisierte Netzgleichrichterschaltung
GB1050605A (de) * 1961-09-21
DE2225720A1 (de) * 1971-05-28 1972-12-14 Parlour William J Ltd Elektrisches Gerat
US3708744A (en) * 1971-08-18 1973-01-02 Westinghouse Electric Corp Regulating and filtering transformer

Also Published As

Publication number Publication date
IT8619600A0 (it) 1986-02-28
AU7125387A (en) 1987-09-28
WO1987005412A1 (en) 1987-09-11
IT1190079B (it) 1988-02-10
IT8619600A1 (it) 1987-08-28
EP0302856A1 (de) 1989-02-15

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