EP1313113A2 - Transformator - Google Patents

Transformator Download PDF

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Publication number
EP1313113A2
EP1313113A2 EP02257972A EP02257972A EP1313113A2 EP 1313113 A2 EP1313113 A2 EP 1313113A2 EP 02257972 A EP02257972 A EP 02257972A EP 02257972 A EP02257972 A EP 02257972A EP 1313113 A2 EP1313113 A2 EP 1313113A2
Authority
EP
European Patent Office
Prior art keywords
transformer
winding
shield
housing
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.)
Withdrawn
Application number
EP02257972A
Other languages
English (en)
French (fr)
Inventor
Jens Frank Markwardt
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.)
Friwo Far East Ltd
Original Assignee
Friwo Far East Ltd
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
Priority claimed from EP01309737A external-priority patent/EP1313111A1/de
Application filed by Friwo Far East Ltd filed Critical Friwo Far East Ltd
Priority to EP02257972A priority Critical patent/EP1313113A2/de
Publication of EP1313113A2 publication Critical patent/EP1313113A2/de
Withdrawn legal-status Critical Current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
    • H01F27/02—Casings
    • 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

Definitions

  • the present invention relates to transformers, and in particular to low voltage "plug-pack" transformers used for battery chargers in or for rechargeable consumer products.
  • the transformer comprises an iron core carrying first and secondary transformer windings.
  • the transformer is housed within an enclosure. Projecting from the outer surface of the enclosure are electrical pins adapted to engage an electrical wall outlet. The pins are in electrical connection with the primary winding for energising the transformer.
  • the secondary winding is connected to a rectifier and output cord.
  • the enclosure In order to comply with electrical safety standards the enclosure must be made from fire retardant material.
  • the choice of material depends on the operating temperature and normal fault operating temperature of the transformer according to various international safety standards such as UL1950 or EN60950. Fire retardant material is more expensive then normal plastics material and this adds to the cost of the enclosure.
  • an electrical transformer comprising:
  • the shield is fire-retardant.
  • the shield extends between the primary winding and the housing.
  • said or another shield extends between the secondary winding and the housing.
  • the transformer includes an electrical pin assembly detachable from the first and second electrical connectors, said pin assembly comprising a pair of pins that project from the housing to facilitate connection of the transformer with an electrical wall outlet.
  • the transformer includes a winding bobbin that is formed integrally with the shield.
  • a battery charger including:
  • not primary winding is formed on a bobbin that is formed in integrally with the shield.
  • Figures 1 to 4 show pins in a European configuration
  • Figures 5, 6 and 9 show pins in a British configuration
  • Figures 7, 8 and 10 show a transformer plug-pack having US-configured pins.
  • Figures 1 and 2 are perspective views of a battery charger that, externally, is substantially identical to those of known type.
  • An enclosure 1 houses a transformer and rectifier. Electrical pins 2 and 3 project from one side of the enclosure 1 and are connected electrically with the transformer. The pins 2 and 3 are adapted to plug into an electrical wall outlet (not shown) to energise the transformer. An electrical output cord (not shown) emerges from an aperture (shown with cord protector 4) in the enclosure 1.
  • the enclosure 1 is separable at an equator 5 into two enclosure parts 1a and 1b.
  • a transformer comprising an core 6 carrying a winding bobbin 19 with a first, or primary, winding 7 and second, or secondary, winding 8 wound thereon.
  • the secondary winding 8 is in electrical connection with a rectifier 9 for providing a low voltage DC output from the battery charger.
  • the plug-pack might be adapted for use in AC applications in which case there would be no rectifier.
  • the tails (not shown) of the primary winding 7 are connected to electrical connectors 10 and 11 respectively.
  • the electrical connectors 10 and 11 are supported in a housing 12 at one end of bobbin 19.
  • a cartridge 13 bears the two electrical pins 2 and 3.
  • the cartridge 13 is disposed in juxtaposition on enclosure part 1b so that pins 2 and 3 extend through apertures 14 and 15 therein.
  • the lower end of the electrical pins 2 and 3 engage the electrical connectors 10 and 11 to electrically communicate with the primary transformer winding 7. In this way, when the electrical pins are pluged into an electrical wall outlet the transformer is energised.
  • One uniqueness of the illustrated embodiments is the provision of a shield or cover 16 that protects the enclosure parts 1a and 1b from any sparks or flames that might be generated from the vicinity of the electrical connectors 10 and 11 and at least the tail portions of transformer primary winding 7.
  • the shield 16 can comprise an upper shield portion 16a that can extend alongside and adjacent the primary winding 7 as shown in Figure 3, or might extend further to alongside and adjacent the secondary winding 8 as shown in Figure 7.
  • the bottom extremity of the upper shield part 16a is received within the bottom shield part 16b.
  • the shield 16 can be a unitary piece that extends from the vicinity of the electrical connectors 10 and 11 and at least the tale portions of the transformer primary winding 7 to alongside and adjacent the secondary winding 8.
  • the shield 16, or shield parts 16a and 16b are fabricated from a fire-retardant material so as to protect the housing parts 1a and 1b from sparks and/or heat. In this regard, it might be worth noting that heat can be generated by the windings themselves.
  • the cover 16, or lower shield part 16b has two apertures 17 and 18 therein to facilitate access to electrical connectors 10 and 11 by lower ends of pins 2 and 3. Apertures 17 and 18 have shrouds so that the connection between lower ends of pins 2 and 3 and connectors 10 and 11 are enclosed by the cover 16.
  • the cover 16 made of fire retardant material shields at least the primary winding ("high voltage") connection parts of the transformer in a fire retardant manner as required by the appropriate safety standards.
  • An advantage of the invention is that it allows the outer enclosure 1 to be made to a less fire-retardant standard.
  • the cover 16 provides the necessary electrical protection. This reduces costs as a lower quantity of fire retardant material is required for the shield 16 while still providing a satisfactory level of safety for the transformer.
  • PBT Polybutylene Terephthalate
  • connectors 10 and 11 be omitted and the electrical pins 2 and 3 be in direct electrical contact with the tails of the primary winding 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
EP02257972A 2001-11-19 2002-11-19 Transformator Withdrawn EP1313113A2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02257972A EP1313113A2 (de) 2001-11-19 2002-11-19 Transformator

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP01309737A EP1313111A1 (de) 2001-11-19 2001-11-19 Transformator
EP01309737 2001-11-19
EP02257972A EP1313113A2 (de) 2001-11-19 2002-11-19 Transformator

Publications (1)

Publication Number Publication Date
EP1313113A2 true EP1313113A2 (de) 2003-05-21

Family

ID=26077191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02257972A Withdrawn EP1313113A2 (de) 2001-11-19 2002-11-19 Transformator

Country Status (1)

Country Link
EP (1) EP1313113A2 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1653487A1 (de) * 2004-10-19 2006-05-03 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Isolieranordnung für elektrische Bauelementen und Verfahren zur Herstellung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"INTERNATIONAL STANDARDS IEC 60065", 1998, GENEVA, SWITZERLAND, pages: 1 - 4, XP002970917
"INTERNATIONAL STANDARDS IEC 60950", 1999, IEC, GENEVA, SWITZERLAND, pages: 281, 285, XP002970916

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1653487A1 (de) * 2004-10-19 2006-05-03 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Isolieranordnung für elektrische Bauelementen und Verfahren zur Herstellung
CN1763873B (zh) * 2004-10-19 2010-05-26 电灯专利信托有限公司 用于电部件的绝缘装置和相关方法

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 20040218