EP2492930A2 - Transformer and drive device including the same - Google Patents

Transformer and drive device including the same Download PDF

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Publication number
EP2492930A2
EP2492930A2 EP12156016A EP12156016A EP2492930A2 EP 2492930 A2 EP2492930 A2 EP 2492930A2 EP 12156016 A EP12156016 A EP 12156016A EP 12156016 A EP12156016 A EP 12156016A EP 2492930 A2 EP2492930 A2 EP 2492930A2
Authority
EP
European Patent Office
Prior art keywords
frame
transformer
winding
spacer unit
insulating spacer
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Withdrawn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
EP12156016A
Other languages
German (de)
English (en)
French (fr)
Inventor
Yong Cao
Jianbo Gao
Haixuan Lin
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
Original Assignee
Osram 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 Osram GmbH filed Critical Osram GmbH
Publication of EP2492930A2 publication Critical patent/EP2492930A2/en
Withdrawn legal-status Critical Current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
    • H01F27/28—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
    • H01F27/326—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures specifically adapted for discharge lamp ballasts
    • 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
    • H01F38/08—High-leakage transformers or inductances
    • H01F38/10—Ballasts, e.g. for discharge lamps

Definitions

  • the present invention generally relates to the field of electrical technologies and particularly to a transformer and a drive device and a product following Safety Extra Low Voltage (SELV) requirement including the transformer and more particularly to a ballast including the transformer and a low voltage halogen lamp or Light Emitting Diode (LED) driven with such a ballast.
  • SELV Safety Extra Low Voltage
  • a ballast including the transformer and a low voltage halogen lamp or Light Emitting Diode (LED) driven with such a ballast.
  • a transformer is widely adopted in a product following SELV requirement.
  • various electrical isolation standards have to been complied with between a winding of the transformer and other electrical components over a Printed Circuit Board (PCB) other than the transformer, for example, a creepage distance and an electrical clearance are required to be sufficient (for example, a creepage distance and an electrical clearance shall be at least 6mm as regulated in IEC61347-2-2 and SELV requirement).
  • PCB Printed Circuit Board
  • the creepage distance refers to the shortest path measured over an isolation surface between two electrically conductive components or an electrically conductive component and an apparatus guard interface. That is, such a phenomenon occurs in different usage scenarios that an isolation material around a conductor is polarized to be charged, and the radius of this charged area, which is annular when the conductor is circular, is referred to as the creepage distance.
  • the electrical clearance refers to the shortest spatial distance between two electrically conductive components or an electrically conductive component and an apparatus guard interface, i.e., the shortest distance over which isolation can be achieved in the air while ensuring electrical performance stability and safety.
  • the electrical clearance and the creepage distance are generally increased using a winding wire with three layers of isolation lines or an isolation sheet arranged on the PCB.
  • a transformer including: a magnetic core; a frame; at least one winding wound over the frame; and an insulating spacer unit coupled with the frame and configured to offer compliance between the winding and another electrically conductive component outside the transformer with a predetermined electrical isolation standard.
  • the insulating spacer unit can be fixed at the external side of the area of the frame wound with the winding, and the insulating spacer unit can be further located between the area of the frame wound with the winding and the other electrically conductive component arranged proximate to the area.
  • the insulating spacer unit can completely or partially encircle the external side of the frame and can extend at the upper and lower ends of the insulating spacer unit respectively over a first predetermined length and a second predetermined length at a first predetermined angle and a second predetermined angle relative to the external side of the frame.
  • the insulating spacer unit can be an insulating sheet which can extend over the first predetermined length inward or outward radically along the frame at the upper edge of the external side of the frame and which can over the second predetermined length inward or outward radically along the frame at the lower edge of the external side of the frame.
  • a lock structure can be arranged in the area of the frame unwound with the winding to fix the insulating spacer unit and the frame.
  • the lock structure and the insulating spacer unit can be further arranged so that there is at least a predetermined creepage distance between the winding and the other electrically conductive component along the contact surface of the lock structure and the insulating spacer unit.
  • the insulating spacer unit can be formed integrally with the frame.
  • the transformer according to still another embodiment of the invention can be a transformer following SELV requirement.
  • the transformer can be an annular transformer following SELV requirement including a first winding wound over the magnetic core and a second winding wound over the frame as the at least one winding wound over the frame; and the frame surrounds the outside of the magnetic core.
  • a method for manufacturing a transformer which includes: preparing a magnetic core and a frame; winding at least one winding over the frame; and coupling the frame and an insulating spacer unit configured to offer compliance between the winding and another electrically conductive component outside the transformer with a predetermined electrical isolation standard.
  • a drive device for an apparatus following SELV requirement which includes the transformer, to drive the apparatus following SELV requirement to operate and an apparatus following SELV requirement including the drive device.
  • the apparatus following SELV requirement can be low voltage halogen lamp or an LED and the drive device can be a ballast.
  • Fig.1 illustrates an exploded view of a transformer according to an embodiment of the invention
  • Fig.2 illustrates a sectional view of the transformer according to the embodiment of the invention
  • Fig.3 illustrates a top view of the transformer according to the embodiment of the invention
  • Fig.4a-Fig.4d are schematic diagrams of various specific configurations of an insulating spacer unit in the transformer according to the embodiment of the invention.
  • Fig.5 is a flow chart of a method for manufacturing a transformer according to an embodiment of the invention.
  • a transformer including a magnetic core, a frame, at least one winding wound over the frame, and an insulating spacer unit coupled with the frame and configured to offer compliance between the winding and another electrically conductive component outside the transformer at least with a predetermined electrical isolation standard.
  • Fig.1 illustrates an exploded view of an annular transformer, e.g., an annular transformer for a drive device of a low voltage halogen lamp and an LED, according to an embodiment of the invention.
  • the annular transformer in Fig.1 includes a magnetic core C, a primary winding E wound over the magnetic core C, parts B and C of a frame surrounding outside the magnetic core C while snapping thereon, a secondary winding F wound outside the frame and an isolation sheet A coupled with the frame.
  • the isolation sheet A is configured to offer compliance between the secondary winding and another electrically conductive component outside the annular transformer at least with a predetermined electrical isolation standard, e.g., a creepage distance (with a typical value of 6mm) and an electrical clearance as regulated in the standard of IEC61347-2-2.
  • a predetermined electrical isolation standard e.g., a creepage distance (with a typical value of 6mm) and an electrical clearance as regulated in the standard of IEC61347-2-2.
  • the insulating sheet A in the embodiment of the invention is merely an example of the insulating space unit, and the insulating space unit can alternatively be formed appropriately into another shape, e.g., a bump shape, as needed for a design.
  • the secondary winding E can be wound over the frame instead of being wound directly over the magnetic core C.
  • Fig.3 is a top view of the annular transformer in Fig.1 after being assembled. it shall be noted that the secondary winding F is wound over only a part of the area of the frame as can be apparent in Fig.1 and Fig.3 , but the invention will not be limited thereto, and a secondary winding can alternatively be wound over the entire frame as needed in practice.
  • the insulating sheet A covers only the external side of the areas of the frame B and D wound with the secondary winding and parts of the adjacent areas thereof.
  • the invention will not be limited thereto, and the insulating sheet A can cover the external side of other areas of the frame unwound with the secondary winding and even the external side of the entire frame (that is, encircle the frame circumferentially).
  • the insulating sheet A can partially or completely encircle the external side of the frame, which can be dependent upon a site where an electrically conductive component other than the annular transformer is to be arranged with respect to the annular transformer.
  • the insulating sheet A can be provided only at a site where the electrically conductive component is to be arranged proximate to the area of the frame wound with the secondary winding.
  • the insulating sheet A can alternatively be provided at another appropriate site dependent upon another matter of design so long as the desired electrical isolation standard can be complied with.
  • an insulating sheet A can be arranged to cover the above sites as a whole, or a plurality of insulating sheets A can be arranged to cover the respective sites. Alternatively, a plurality of discrete insulating sheets A can be arranged dependent upon another matter of design.
  • Fig.2 is a sectional view of the annular transformer in Fig.1 taken along the line I-I (see Fig.1 ) after being assembled, where the reference numeral "G" schematically represents another electrically conductive component that may be arranged in the area adjacent to the transformer and therefore is not illustrated in the I-I sectional view.
  • the insulating sheet A covers the external side of the frame while abutting against the latter or while being arranged proximate to the latter.
  • the insulating sheet A is arranged encircling the external side of the frame of the annular transformer with its upper end extending outward radically along the frame of the annular transformer at the upper edge of the external side of the frame relative to the frame and its lower end extending inward radically along the frame at the lower edge of the external side of the frame relative to the frame, but the invention will not be limited thereto.
  • the upper end of the insulating sheet A can extend upward or inward radically along the frame at the upper edge of the frame and the lower end of the insulating sheet A can extend outward radically along the frame at the lower edge of the frame in an alternative embodiment.
  • the upper and lower ends of the insulating sheet A can extend in any appropriate direction relative to the external side of the frame at the upper or lower edges of the frame in another alternative embodiment.
  • the upper and lower ends of the insulating sheet A can extend at any predetermined angle (e.g., the angles ⁇ and ⁇ in Fig.4a to Fig.4d ) relative to the external side of the frame.
  • the angles ⁇ and ⁇ in Fig.4a are approximately 90 degrees
  • the angle ⁇ in Fig.4b is approximately 0 degree (that is, the upper end of the insulating sheet A extends in the direction along the external side of the frame).
  • the upper and lower ends of the insulating sheet A may not extend at the upper or lower edge of the frame but can extend from another site in any appropriate direction relative to the external side of the frame. It shall be noted that the lengths over which the upper and lower ends of the insulating sheet A extend and the angles ⁇ and ⁇ at which they extend relative to the external side of the frame B and D can be the same as or different from one another. Moreover in Fig.4a to Fig.4d , the two parts B and D of the frame have not been distinguished and the secondary winding F wound over the frame has not been illustrated for the sake of conciseness.
  • the electrical isolation standard e.g., a creepage distance, an electrical clearance, etc.
  • the creepage distance and the electrical clearance of 6mm as regulated in the standard of IEC61347-2-2 are taken as an example of the distance compliance with the electrical isolation standard, as illustrated in Fig.2 .
  • the electrically conductive component G as schematically illustrated in Fig.2 can be arranged proximate to the insulating sheet A while being spaced from the secondary winding F by at least the predetermined creepage distance and electrical clearance. This can make the entire circuit including the transformer compact, reduce the volume of an apparatus and lower the production cost thereof.
  • Fig.3 is a top view of the annular transformer in Fig.1 after being assembled.
  • a lock structure H arranged in the area of the frame unwound with the secondary winding to fix the frame and the insulating sheet A is illustrated in both Fig.1 and Fig.3 .
  • the lock structure H is formed of a lock part H1 ( Fig.1 ) on the frame and a lock part H2 ( Fig.1 ) on the insulating sheet A, but the invention will not be limited thereto.
  • the frame and the insulating sheet A can alternatively be coupled to one another in any other appropriate way, for example, connected to one another through a pin, etc..
  • the frame and the insulating sheet A can be fixed to one another in another way instead of being fixed through the lock structure H arranged in the area of the frame unwound with the secondary winding.
  • the contact line which is the projection of the contact face between the insulating sheet A and the frame onto the top view, as indicated by the thick solid line in Fig.3 , is of such a length that the creepage distance between the secondary winding and another electrically conductive component outside the annular transformer is at least the predetermined length as regulated in the relevant electrical isolation standard.
  • the creepage distance of 6mm as regulated in the standard of IEC61347-2-2 is taken as an example, as illustrated in Fig.3 , but the invention will not be limited thereto.
  • the lock structure can be arranged in the area of the frame unwound with the secondary winding at a site sufficiently distant from the secondary winding so that the creepage distance between the secondary winding and the other electrically conductive component is at least the predetermined length regardless how long the contact line, which is the projection of contact face between the insulating sheet A and the frame onto the top view, will be.
  • the electrically conductive component G as schematically illustrated in Fig.3 can be arranged proximate to the boundary between the insulating sheet A and the frame while being spaced from the secondary winding F by at least the predetermined creepage distance. This can make the entire circuit including the transformer compact and reduce the production cost thereof.
  • the frame and the insulating sheet can alternatively be formed integrally.
  • an electrically conductive component other than the transformer can be arranged proximate to the transformer as needed while ensuring the original functionality and performance of the circuit so that the entire product or component including the transformer can be downsized at a lower cost.
  • Fig.5 illustrates a method for manufacturing a transformer according to an embodiment of the invention.
  • the method includes the steps of: preparing a magnetic core and a frame (S10); winding at least one winding over the frame (S20); and coupling the frame with an insulating spacer unit configured to offer compliance between the winding and another electrically conductive component outside the transformer at least with a predetermined electrical isolation standard (S30).
  • an electrically conductive component other than the transformer can be arranged proximate to the transformer as needed while ensuring the original functionality and performance of the circuit so that the entire product or component including the transformer can be downsized at a lower cost.
  • the transformer according to the embodiments of the invention can be applicable to a product following SELV requirement and a drive device thereof and particularly to a low voltage halogen lamp and an LED and a drive device thereof (e.g., a ballast).
  • a product following SELV requirement and a drive device thereof shall also be construed as coming into the scope of the invention, and they will also similarly have the advantages of a small size and a low cost.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP12156016A 2011-02-25 2012-02-17 Transformer and drive device including the same Withdrawn EP2492930A2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011100514711A CN102651272A (zh) 2011-02-25 2011-02-25 变压器以及包括该变压器的驱动装置

Publications (1)

Publication Number Publication Date
EP2492930A2 true EP2492930A2 (en) 2012-08-29

Family

ID=45656092

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12156016A Withdrawn EP2492930A2 (en) 2011-02-25 2012-02-17 Transformer and drive device including the same

Country Status (2)

Country Link
EP (1) EP2492930A2 (zh)
CN (1) CN102651272A (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104979084A (zh) * 2014-04-14 2015-10-14 特富特科技(深圳)有限公司 一种磁性元件的固定装置
GB2576316A (en) * 2018-08-13 2020-02-19 Murata Manufacturing Co Isolation core for power converter

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104021924B (zh) * 2014-06-09 2016-07-06 中国航空工业集团公司北京航空制造工程研究所 一种高压逆变功率变压器及其制作方法
CN105118634B (zh) * 2015-09-23 2017-04-12 四川菲博斯科技有限责任公司 一种有效散热的变压器
CN105118633B (zh) * 2015-09-23 2017-04-12 四川菲博斯科技有限责任公司 一种均匀散热的变压器
CN105140010B (zh) * 2015-09-23 2017-04-12 四川菲博斯科技有限责任公司 一种环形变压器
CN105118632B (zh) * 2015-09-23 2017-04-12 四川菲博斯科技有限责任公司 一种变压器
JP6610284B2 (ja) * 2016-01-22 2019-11-27 Ｔｄｋ株式会社 コイル装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1784833A (en) * 1930-03-01 1930-12-16 Western Electric Co Toroidal inductance device
CN2347250Y (zh) * 1998-04-23 1999-11-03 王万勋 环形变压器
US6507260B1 (en) * 2000-04-27 2003-01-14 Echelon Corporation Electrical transformer for use with twisted pair
JP2007335805A (ja) * 2006-06-19 2007-12-27 Nippon Makisen Kogyo Kk 電源トランス
CN201072700Y (zh) * 2007-08-15 2008-06-11 中国电力科学研究院 可产生宽脉冲的脉冲变压器

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104979084A (zh) * 2014-04-14 2015-10-14 特富特科技(深圳)有限公司 一种磁性元件的固定装置
GB2576316A (en) * 2018-08-13 2020-02-19 Murata Manufacturing Co Isolation core for power converter
GB2576316B (en) * 2018-08-13 2021-03-03 Murata Manufacturing Co Isolation core for power converter

Also Published As

Publication number Publication date
CN102651272A (zh) 2012-08-29

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