EP1657728B1 - Transformator - Google Patents

Transformator Download PDF

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Publication number
EP1657728B1
EP1657728B1 EP04425853A EP04425853A EP1657728B1 EP 1657728 B1 EP1657728 B1 EP 1657728B1 EP 04425853 A EP04425853 A EP 04425853A EP 04425853 A EP04425853 A EP 04425853A EP 1657728 B1 EP1657728 B1 EP 1657728B1
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EP
European Patent Office
Prior art keywords
transformer
core
bobbin
cover cap
primary
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.)
Active
Application number
EP04425853A
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English (en)
French (fr)
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EP1657728A1 (de
Inventor
Luca Bordin
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.)
Osram GmbH
Osram SpA
Original Assignee
Osram GmbH
Osram SpA
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 Osram GmbH, Osram SpA filed Critical Osram GmbH
Priority to EP04425853A priority Critical patent/EP1657728B1/de
Priority to AT04425853T priority patent/ATE470228T1/de
Priority to DE602004027503T priority patent/DE602004027503D1/de
Priority to PCT/EP2005/012261 priority patent/WO2006050995A2/en
Priority to CN200580038962.5A priority patent/CN101057305B/zh
Publication of EP1657728A1 publication Critical patent/EP1657728A1/de
Application granted granted Critical
Publication of EP1657728B1 publication Critical patent/EP1657728B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/10—Connecting leads to windings
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads
    • H01F2005/043—Arrangements of electric connections to coils, e.g. leads having multiple pin terminals, e.g. arranged in two parallel lines at both sides of the coil

Definitions

  • the present invention relates to (electrical) transformers.
  • Transformers are used in several areas e.g. in power supply units for halogen lamps, wherein an input line voltage (e. g. the typical 220-240 volt mains voltage of most European countries, while 100 - 120 volts are typical values for many American countries) is transformed into an output voltage of 6, 12 or 24 volts. Transformers are also frequently used as output isolating transformers in electronic converters for halogen lamps to produce a 12 volt output voltage.
  • an input line voltage e. g. the typical 220-240 volt mains voltage of most European countries, while 100 - 120 volts are typical values for many American countries
  • Transformers are also frequently used as output isolating transformers in electronic converters for halogen lamps to produce a 12 volt output voltage.
  • Thick copper wires are also currently used for the secondary windings. These wires exhibit a sufficient rigidity to permit automatic placement during assembly of the transformers. The ends of the primary winding are conversely soldered to associated pins. This is particularly the case for electronic transformers for halogen lamps. These are in fact step-down transformers, i.e. transformers where the voltage at the secondary winding is lower than the voltage at the primary winding, thus leading to a higher current at the secondary winding with respect to the current at the primary winding. This leads to thinner wires at the primary that must be soldered to the pins in order to have a sufficient degree of rigidity.
  • a bobbin having quite a simple structure is typically selected, with the main purposes of permitting fixing the pins and the secondary wires and supporting the magnetic part of the transformer. In some cases this inevitably involves the need of using a triple insulated wire for the secondary winding with the additional provision of a layer of insulating tape.
  • all components related to the primary must be placed at 3mm from the secondary winding if they are not isolated, very close to it if they are basic isolated. In the remainder of cases, all components related to the primary side must be placed at a distance of at least 3mm from the winding, if they have a basic insulation and at least 6mm if such an insulation is not provided.
  • typical requirements to be met in present-day applications are a maximum height of the transformer from the substrate less than 14.5mm, a power handling capacity of 75 Watts in nominal working conditions (European mains voltages) and the ability of fixing the ends of the wires of the windings in order to avoid problems likely to arise during the assembly phase of the transformer in production.
  • the object of the present invention is thus to provide a transformer adapted to fully satisfactorily meet the requirements set forth in the foregoing.
  • a particularly preferred embodiment of the invention uses an EFD (or EFF) core in the place of a ferrite core.
  • EFD core is a sort of E core, which is however "flatter" than an E core, the effective area being equal. In that way a power of the order of 75 Watts can be delivered in nominal European halotronic working conditions with the maximum height from the substrate of less than 14.5mm.
  • a particularly preferred embodiment of the invention provides for the presence of a bobbin around this kind of core that permits the whole transformer component to be in compliance with SELV (Safety Extra Low Voltage) insulation requirements.
  • the components referred to the primary side can be placed very close to transformer and the secondary tracks can run on the component side of the board since the secondary winding is reinforced insulated (following EN 61347) from the core, this being the more external conductive part of the component.
  • the transformer of the invention includes two winding chambers that are separated and placed close to each other.
  • the structure is an asymmetric one, namely insulation is provided at one chamber (usually the secondary winding chamber), in the form of reinforced insulation, contrary to the arrangement of EP-B-0793 243 , where double insulation is used. Insulation is preferably provided also outside the core (e.g. via extensions of a cover cap associated with the bobbin), and not just within.
  • a transformer as described herein can be automatically mounted (i.e. located on a substrate such as a PCB) even the secondary wire is a Litz wire, which is rather flexible.
  • the end terminals of the secondary windings are preferably soldered together with the pins, thus giving rise to thick pins that are stable and can be fixed as a normal pin.
  • the operation of soldering the winding wire to the pins is facilitated by the preferred provision of apertures in the form of e.g. notches (dead-holes) in the transformers casing. These notches retain the wire securely in place in possible cooperation with beak formations provided in the casing itself.
  • reference 1 designates as a whole a transformer adapted for use, e.g. in connection with the halogen lamps.
  • a transformer is usually intended to operate in a frequency range higher than the mains frequency and includes the basic following elements:
  • the two winding chambers 21 and 22 are thus separated and placed close to each other, i.e. side-by-side.
  • the transformer 1 described herein is particularly adapted to operate with cores of the EFD type (sometimes referred to also as EFF cores by some manufacturers in the Far East).
  • a particularly preferred embodiment of the arrangement described herein provides for the core 4 to be ferrite core of the EFD 25 type.
  • This core type slightly differs from standard E-type cores due to having a lowered profile while maintaining the same effective area (A e ).
  • Resorting to such a core is advantageous in that it leads to a transformer 1 having a lower thickness (height) overall while maintaining a good power handling capacity.
  • the arrangement described herein adopts such a core type while ensuring full compliance with insulation requirements as dictated by standards such as EN 61347 concerning the so-called SELV (Safety Extra Low Voltage) insulation requirement.
  • the arrangement described herein provides such a level of insulation by providing reinforced insulation of the secondary winding 32 with respect to the primary winding 31 and the ferrite core 4.
  • any electronic components related to the primary winding 31 can be mounted very close to the ferrite core 4 (this fact can be best appreciated in figure 2 ).
  • very close means distances lower than 1mm or even just the distance enough to avoid that such components may come in direct contact with each other (that is "touch” each other).
  • the reinforced level of insulation is achieved with an insulation thickness of at least 1mm between the primary winding 31 and the secondary winding 32 and between the secondary winding 32 and the ferrite core. Additionally, an air “creepage” and a given clearance are provided between the primary winding 31 and the secondary winding 32, on the one side, and between the secondary winding 32 and the ferrite core 4, on the other hand.
  • a value for such clearance is at least 6mm, while increased values of 6.4mm may be taken into account when complying with the American norm UL 1310 (Standard for Safety for Class 2 Power Units).
  • This norm is claimed by the American Subject UL 879A in order to cover LED (light emitting diodes) kits for field installations, where the transformer 1 can be used.
  • a protective cover cap of an electrically insulating material 52 is provided and adapted to be associated with the secondary winding chamber.
  • the cap 52 is typically comprised of the same electrically insulating material that comprises the other parts of the bobbin. The cap 52 will thus be considered in all respects as a part of the bobbin 2 of the transformer.
  • the thickness for all the walls surrounding the secondary chamber wherein the secondary winding 32 is wound is thus selected as having a minimum thickness of no less than 1mm, while 1.5mm is a preferred thickness for the lateral walls of the chambers due to a presence of labyrinths as better described in the following.
  • the cover cap 52 has approximately an "omega" or “mesa” shape overall (this can best appreciated in the front view of figure 3 ) and the lateral walls of the secondary winding chamber are thus defined by the lateral walls 520 of the cap 52.
  • the thickness of the walls between the primary and secondary windings 31, 32 which walls are designated 320 in figure 2 is typically 0.5mm.
  • a labyrinth is created at both ends of the secondary winding 32 by creating interpenetrating walls portions of those part of the bobbin structure situated at the ends of the secondary winding chamber and complementary wall formations provided in the cap 52.
  • a first set of interpenetrating walls is created by causing the wall 320 between the primary and secondary windings 31, and 32 to be provided with a groove 321 adapted to interpenetratingly cooperate with a protruding wall 521 provided at the inner (i.e. proximal) side of the cap 52.
  • the presence of the wall 521 and its interpenetrating relationship with the groove 321 provided in the wall 320 are best appreciated in the plan view of figure 4 .
  • a thoroughly similar labyrinth arrangement is provided at the opposite, outer (i.e. distal) end of the secondary winding 32 by providing an end wall 322 having a central notch or groove 323 adapted to interpenetratingly cooperate with another wall 522 protruding from the internal surface of the cap 52 as best appreciated in figure 3 .
  • the labyrinth arrangement associated with the central wall 320 has a typical nominal length of about 6.7mm, which is enough to provide an effective creepage distance between the primary and secondary windings 31, 32 in excess of 6.4mm.
  • the labyrinth arrangement associated with the wall 322 is usually arranged in order to provide a nominal creepage distance of about 6.5mm.
  • connection pins 6 associated with the secondary winding are usually located protruding from the lower surface of the bobbin 2. These can be provided by resorting to any standard techniques known for that purpose, e.g. in the form of metal pins inserted in the plastic mould for the bobbin. Alternatively, the pins 6 can be provided in the form of integral parts of the bobbin plastic mould over which the ends of the wire of the secondary winding are wound and soldered. Such an arrangement is described in EP-A-1 647 999 .
  • connection pins associated with the primary winding 21 are to the number of four while the secondary 6 are to the number of two. This is simply dictated by the fact the primary winding 22 may in fact be arranged to include different tap/contact points in order to render the transformer 1 adapted to operate with different input voltages while providing the same output voltage. If there is no need for that, the placement of the primary pins can be chosen at convenience.
  • a typical value in the arrangement shown is of at least 7.2mm, which appears to be thoroughly satisfactory for the application contemplated and ensuring SELV insulation.
  • Another factor that plays a role in determining the level insulation of the transformer described herein is given by the path between the secondary pins 6 (and the secondary winding 32) and the ferrite core 4 within the transformer.
  • the length of the path through the labyrinth that is established between the secondary winding and the ferrite core or between a possible secondary track on the component side of the board and the ferrite core is far more than 6.4mm.
  • the vertical height of the cover cap 52 has a maximum value in correspondence with the central wall 320 and gradually decreases towards the distal end of the cap 52 to reach a minimum value in correspondence with the end wall 322, thus avoiding to any obtrusive affect with respect to the secondary pins 6.
  • the cap 52 is designed in such a way to take up the overall "omega” or “mesa” shape.
  • the extensions (“beaks") 523 do not extend just in correspondence with the cap length 52 but also extend in a longitudinal direction of the transformer to envelope or embrace the core 4 for the complete extension thereof, thus supporting the core at its "secondary" end.
  • step-down applications the wire of the primary winding 31 is relatively thin and thus flexible while adapted to retain a given shape.
  • the arrangement described preferably resorts to standard arrangement e.g. by winding and soldering the wire to the pins 7.
  • step-up applications i.e. those applications where the voltage at the secondary winding is higher than the voltage at the primary winding, thus leading to a lower current at the secondary winding with respect to the current at the primary winding
  • step-up applications i.e. those applications where the voltage at the secondary winding is higher than the voltage at the primary winding, thus leading to a lower current at the secondary winding with respect to the current at the primary winding
  • the wire of the secondary winding 32 (and this will apply to the wire of the primary winding in the case of step-up applications) can be of three types: a copper wire covered by an insulating enamel, a Litz wire, or a conductor comprised of a braid of very thin wires.
  • a copper wire covered by an enamel is per se rather rigid, not unlike a pin by itself, whereby the respective ends can be extended through the base portion of the bobbin 2 and play the role of the pins 6 themselves thus permitting automated assembly of the transformer 1.
  • a Litz wire, or - even worse - a braid of very thin wires is intrinsically non rigid, which by necessity requires it to be wound around a pin or in any case fixed onto the pin in order to create a rigid member (pin) adapted to extend through the mounting hole in the printed circuit board.
  • Directly connecting a Litz wire to the tracks/strips provided in the board may reduce the temperatures in the secondary winding of 5-10°C. This currently leads to most transformers having a Litz wire secondary winding to be assembled manually by an operator.
  • two apertures in the form of notches (i.e. dead-holes) 8 are provided in the bobbin in the vicinity of the secondary pins 6.
  • the apertures 8 are directly produced during the moulding process of the bobbin 2.
  • the ends of the secondary winding 32 (schematically indicated as W and assumed to be comprised of Litz wire or a braid of thin wires) are thus passed through the notches 8 to be soldered to the pins 6.
  • the apertures/notches 8 permit the ends W to be safely kept in a fixed position while the wire ends W are being soldered to be the pin 6 to give rise to a rather massive arrangement.
  • molten solder once brought to the usual soldering temperatures used by winding machines for connecting the end of the windings to the pins, is a highly polar liquid. It intrinsically tends to fill the interstices between the wires (as those comprising e.g. a Litz wire or a wire braid). When removed from the soldering bath the wire ends will thus be in fact compacted and made solidary with the metallic pins 6.
  • a transformer 1 may be produced that is adapted to be easily assembled in an automated way. This while also benefiting from the advantages mentioned in terms of reducing the temperature at the connecting points with the PCB strips and the components located nearby.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Rectifiers (AREA)
  • Insulating Of Coils (AREA)
  • Coils Of Transformers For General Uses (AREA)

Claims (16)

  1. Transformator (1), umfassend:
    - eine Spule (2), die erste (21) und zweite (22) Wicklungskammern definiert,
    - einen Kern (4), der auf der Spule befestigt ist, und
    - erste (31) und zweite (32) Wicklungen, die in den ersten (21) und zweiten (22) Wicklungskammern jeweils gewickelt sind, wobei die Spule (2) eine Abdeckungskappe (52) in Verbindung mit der zweiten Wicklung (32) einschließt, wobei
    - die Spule (2) einschließlich der Abdeckungskappe (52) zur Bereitstellung einer Isolierung der zweiten Wicklung (32) in Bezug auf die erste Wicklung (31) und den Kern (4) gestaltet ist,
    dadurch gekennzeichnet, dass:
    - der Kern (4) ein EFD/EFF Kern ist,
    - die Abdeckungskappe (52) laterale Ausdehnungen (523) aufweist, die sich von der Abdeckungskappe (52) zum Umgeben der längs gerichteten Beine des EFD/EFF Kerns (4) erstrecken, und
    - die lateralen Ausdehnungen (523) eine allgemeine L-Form mit distalen Abschnitten aufweisen, die zumindest unwesentlich den Kern (4) bedecken, um einen Luftpfad zwischen der zweiten Wicklung (32) und dem Ferrit-Kern (4) auf der Außenseite des Transformators (1) zu erzeugen, wobei die Isolierung als eine verstärkte Isolierung vorgesehen ist.
  2. Transformator nach Anspruch 1, dadurch gekennzeichnet, dass die ersten (21) und zweiten (22) Wicklungskammern Seite an Seite angeordnet sind.
  3. Transformator nach entweder Anspruch 1 oder 2, dadurch gekennzeichnet, dass sich die Abdeckungskappe (52) und demnach die verstärkte Isolierung primär über die zweite Wicklung (32) erstreckt, ohne sich über die erste Wicklung (31) zu erstrecken.
  4. Transformator nach irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass sich die Abdeckungskappe (52) über die Gesamtheit der zweiten Wicklungskammer (22) erstreckt.
  5. Transformator nach irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Spule (2) einschließlich der Abdeckungskappe (52) aus einem isolierenden Material besteht.
  6. Transformator nach irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Spule (2) eine Trennwand (320) mit einer Wandstärke von zumindest 1 mm zwischen der ersten Wicklung (31) und der zweiten Wicklung (32) sowie Trennwände (520, 22, 322) mit einer Wandstärke von zumindest 1 mm zwischen der sekundären Wicklung (32) und dem Kern einschließt.
  7. Transformator nach irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Spule (2) einschließlich der Abdeckungskappe (52) zur Bereitstellung einer Kriech- und Luftstrecke von zumindest 6,4 mm zwischen der ersten (21) und der zweiten Wicklung (22) und zwischen der zweiten Wicklung (22) und dem Kern (4) gestaltet ist.
  8. Transformator nach irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die zweite Wicklungskammer (22) vollständig durch Wände mit einer Dicke von zumindest 1 mm umgeben ist.
  9. Transformator nach irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Abdeckungskappe (52) eine Omega- oder Mesaartige Gesamtform aufweist.
  10. Transformator nach Anspruch 1, dadurch gekennzeichnet, dass die lateralen Ausdehnungen (523) eine allgemeine C-Form aufweisen, die das äußere Bein des Ferrit-Kerns (4) umgeben.
  11. Transformator nach entweder Anspruch 1 oder 10, dadurch gekennzeichnet, dass sich die lateralen Ausdehnungen (523) der Abdeckungskappe (52) längsgerichtet über die Gesamtlänge des Abschnitts des Kerns (4) in Verbindung mit der zweiten Wicklung (32) erstrecken.
  12. Transformator nach irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Spule (2) eine Trennwand (320) zwischen den ersten (21) und zweiten (22) Wicklungskammern in Zusammenarbeit mit einer labyrinthartigen Anordnung mit der Abdeckungskappe (52) einschließt, wobei die labyrinthartige Anordnung einschließt:
    - eine Nut (321) in einer (320) der Trennwand (320) und der Abdeckungskappe (52), und
    - eine Wandgestaltung (521), die zur gegenseitig durchdringenden Erstreckung in die Nut (321) angepasst ist, wobei die Wandgestaltung von der anderen (52) der Trennwand (320) und der Kappe (52) hervorsteht.
  13. Transformator nach irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Spule (2) eine Endwand am distalen Ende der zweiten Wicklungskammer (22) einschließt, dem Kern (4) ausgesetzt, wobei die Endwand mit einer labyrinthartigen Anordnung verbunden ist, die einschließt:
    - eine Nut (323) in einer (322) der Endwand (322) der Abdeckungskappe (52), und
    - eine Wandgestaltung (522), die zum gegenseitig durchdringenden Erstrecken in die Nut (323) angepasst ist, wobei die Wandgestaltung von der anderen (52) des Endes (322) und der Kappe (52) hervorsteht.
  14. Transformator nach irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Spule (2) "L"-förmige Kerben (324) an dem distalen Ende der zweiten Wicklungskammer (22), dem Kern (4) ausgesetzt, einschließt, wobei die Kerben mit einer labyrinthartigen Anordnung verbunden sind, die einschließt:
    - die Kerben selbst (324), und
    - "L"-förmige Wandgestaltungen (524), die zur gegenseitigen durchdringenden Erstreckung in die Kerben (324) angepasst sind, wobei die Wandgestaltung von der Abdeckungskappe (52) hervorsteht, und
    - der innere vertikale Teil der lateralen Ausdehnung (523) der Spule (2) ausgesetzt ist.
  15. Transformator nach irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Spule (2) zugehörige elektrische Verbindungsstifte (6) für die Enden der zweiten Wicklung (32) aufweist, und wobei die Kriech- und Luftstrecke zwischen dem Ferrit-Kern (4) und den zweiten Stiften (6) zumindest 7,2 mm beträgt.
  16. Transformator nach irgendeinem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Abdeckungskappe (52) eine abnehmende Höhe aufweist, beginnend im Bereich zwischen der ersten (21) und zweiten (22) Kammer außerhalb des Transformators (1).
EP04425853A 2004-11-15 2004-11-15 Transformator Active EP1657728B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP04425853A EP1657728B1 (de) 2004-11-15 2004-11-15 Transformator
AT04425853T ATE470228T1 (de) 2004-11-15 2004-11-15 Transformator
DE602004027503T DE602004027503D1 (de) 2004-11-15 2004-11-15 Transformator
PCT/EP2005/012261 WO2006050995A2 (en) 2004-11-15 2005-11-15 A transformer and a related method of assembly
CN200580038962.5A CN101057305B (zh) 2004-11-15 2005-11-15 变压器及相关装配方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425853A EP1657728B1 (de) 2004-11-15 2004-11-15 Transformator

Publications (2)

Publication Number Publication Date
EP1657728A1 EP1657728A1 (de) 2006-05-17
EP1657728B1 true EP1657728B1 (de) 2010-06-02

Family

ID=34932887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425853A Active EP1657728B1 (de) 2004-11-15 2004-11-15 Transformator

Country Status (5)

Country Link
EP (1) EP1657728B1 (de)
CN (1) CN101057305B (de)
AT (1) ATE470228T1 (de)
DE (1) DE602004027503D1 (de)
WO (1) WO2006050995A2 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1693860B8 (de) 2005-02-22 2011-01-26 Osram Gesellschaft mit beschränkter Haftung Mehrkammertransformator
EP1796112B1 (de) * 2005-12-06 2010-05-05 Osram Gesellschaft mit Beschränkter Haftung Mehrkammer-Transformator
US9887035B2 (en) * 2014-01-28 2018-02-06 Sociedad Espanola De Electromedicina Y Calidad, S.A. High-voltage, high-frequency and high-power transformer
CN104616869A (zh) * 2015-02-11 2015-05-13 南京优倍电气有限公司 增强型本安变压器
CN108269679A (zh) * 2016-12-30 2018-07-10 致茂电子(苏州)有限公司 变压器结构
CN109545543A (zh) * 2018-11-30 2019-03-29 深圳原能电器有限公司 一种变压器的自动化加工方法及变压器
KR102419204B1 (ko) * 2022-01-06 2022-07-08 (주)다성하이텍 핀수를 확장한 변압기용 보빈 및 이를 포함한 변압기
KR102419203B1 (ko) * 2022-01-06 2022-07-08 (주)다성하이텍 안전거리 확보를 위한 변압기용 보빈 및 이를 포함한 변압기
CN116759229B (zh) * 2023-07-21 2023-11-17 沅江市金莫特电子有限公司 一种电子变压器生产装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1240795A (en) * 1969-02-12 1971-07-28 Hinchley Engineering Company L Transformer bobbins
DE2326126C2 (de) * 1972-05-30 1983-11-03 Tabuchi Denki K.K., Osaka Kleintransformator für hohe Spannung
US4405913A (en) * 1981-08-17 1983-09-20 Mid-West Transformer Company Coil body
US4980664A (en) * 1990-03-08 1990-12-25 Prem Magnetics Incorporated Transformer bobbin
DE19607714A1 (de) * 1996-02-29 1997-09-04 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Transformator

Also Published As

Publication number Publication date
CN101057305A (zh) 2007-10-17
WO2006050995A2 (en) 2006-05-18
EP1657728A1 (de) 2006-05-17
ATE470228T1 (de) 2010-06-15
WO2006050995A3 (en) 2006-08-03
DE602004027503D1 (de) 2010-07-15
CN101057305B (zh) 2011-07-06

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