EP1783788A2 - Transformator mit Strommessung - Google Patents

Transformator mit Strommessung Download PDF

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Publication number
EP1783788A2
EP1783788A2 EP06405455A EP06405455A EP1783788A2 EP 1783788 A2 EP1783788 A2 EP 1783788A2 EP 06405455 A EP06405455 A EP 06405455A EP 06405455 A EP06405455 A EP 06405455A EP 1783788 A2 EP1783788 A2 EP 1783788A2
Authority
EP
European Patent Office
Prior art keywords
transformer
current
winding
main transformer
power supply
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Withdrawn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
EP06405455A
Other languages
English (en)
French (fr)
Other versions
EP1783788A3 (de
Inventor
Nigel Springett
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.)
DET International Holding Ltd
Original Assignee
DET International Holding 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
Application filed by DET International Holding Ltd filed Critical DET International Holding Ltd
Priority to EP06405455A priority Critical patent/EP1783788A3/de
Publication of EP1783788A2 publication Critical patent/EP1783788A2/de
Publication of EP1783788A3 publication Critical patent/EP1783788A3/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Withdrawn legal-status Critical Current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
    • H01F27/40—Structural association with built-in electric component, e.g. fuse
    • H01F27/402—Association of measuring or protective means
    • 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
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions

Definitions

  • Rectifier diodes have the advantage that they are simple to design into a power supply. They are inserted into the power circuit and the voltage across the power train windings will force the diode to commutate when it is appropriate. Because of their simplicity, diode rectifiers are cheap and easy to incorporate into a given circuit. While offering a simple rectifier design, diode rectifiers have several downsides, e.g. diodes have a fixed forward voltage drop that is independent of the current. This results in high levels of power dissipation, especially at high current levels. When the efficiency of diode rectifiers is calculated for various output voltages, they are found to be efficient at high output voltages, but as the output voltage drops, the efficiency of diode rectifiers drops precipitously.
  • the current sensing device could be a resistive device in combination with an OPAMP or any other device that enables a current measurement
  • the current sensing device preferably includes a current transformer.
  • a primary winding of the current transformer is formed by a section of the at least one transformer winding of the main transformer and not by a junction wire that interconnects the transformer winding with another (preceding or subsequent) circuit of the power supply.
  • the same portion of a conductor forms a section of the transformer winding as well as the primary winding of the current transformer.
  • the primary current transformer winding and the winding of the main transformer have therefore at least one common (full or fractional) turn.
  • the main transformer includes not only one but at least two secondary windings.
  • the secondary windings are connected in series and a section of at least one of the secondary windings forms a primary winding of said current transformer. That is a section of only one secondary winding, a section of several secondary windings or a section of each secondary windings forms a primary winding of the current transformer.
  • the invention is preferably applied in a transformer with a push-pull output stage with two secondary windings connected in series. Accordingly, a section of the first secondary winding forms a primary winding of the current transformer and a section of the second secondary winding also forms a primary winding of the current transformer.
  • the invention is of particular benefit, since it allows a considerable reduction of costs, losses and size in comparison with a conventional transformer having a push-pull output stage with two separate current transformers each connected to one secondary winding.
  • the invention can also be used in other standard converter topologies such as for example forward, flyback, full-bridge, half-bridge, current or voltage fed and further push-pull converters as well as other converter topologies.
  • the invention is particularly suitable for power supplies with a resonant converter.
  • the power supply includes a resonant circuit.
  • an inductance of the main transformer forms an inductance of this resonant circuit. In a non-resonant power supply with a continuous current flow it is not possible to apply the invention.
  • the main transformer with more than one integrated current transformer, for example an additional current transformer on the primary side of the transformer.
  • the space and cost requirements would be increased as well thereby nullifying some of the advantages of the invention.
  • the converter 1 may include further components and circuits as known in the art. However, for a better clarity, these components and circuits have not been shown in the drawings.
  • Fig. 2 shows a schematic, perspective view of a transformer 131 according to the invention.
  • the transformer 131 includes a core that is made up of two E-type core halves 137.1, 137.2 that are for example clamped together by clamps 139.
  • a primary winding 132 is wound around the middle leg 138.
  • a first secondary winding 133 and a second secondary winding 134 are also wound around the middle leg 138, for example on top of the primary winding 132.
  • the first secondary winding 133 includes a first end portion 133.1 which is connected to a terminal (not shown), a centre portion 133.2 which is wound directly around the middle leg 138 and a second end portion 133.3 which is fed through a ring-type core 164and is then connected to a center tap 135.
  • the second secondary winding 134 includes a first end portion 134.1 which is connected to a terminal (not shown), a centre portion 134.2 which is wound directly around the middle leg 138 and a second end portion 134.3 which is fed through the ring-type core 164and is then connected to the center tap 135 too.
  • a further winding Around the ring-type core 164 is wound a further winding, the secondary winding 163.
  • the ring-type core 164, the primary windings 133.3 and 134.3 and the secondary winding 163 form the current transformer 160.
  • Fig. 3 shows a schematic, perspective view of another current transformer 260 integrated into one of the legs 238 of a main transformer 231.
  • the first secondary winding 233 includes a first end portion 233.1, a centre portion 233.2 which is wound around the leg 238 and a second end portion 233.3 which is fed through the ring-type core 264 of the integrated current transformer 260 and forms a further turn of the secondary winding 233 as well as a turn of the primary winding of the current transformer 260.
  • the second output is of the push-pull type as well and is connected in parallel to the first output. It is similar or even identical to the first output and includes a rectifier circuit 440 with synchronous rectifiers 441, 442 and an output circuit 450 with output capacitor 451.
  • the second output includes a further current transformer 460 that is integrated into the main transformer 431. An end portion 433.3 of the first secondary winding 433 of the main transformer 431 forms a primary winding of the current transformer 460 and an end portion 434.3 of the second secondary winding 434 also forms a primary winding of the current transformer 460.
  • the current transformer 460 further includes a secondary winding 463 for providing a current signal representing the sensed current in the secondary windings 433, 434. Again, no control circuit for controlling the switching of the switches of this transformer arrangement is shown.
  • Control circuits that generate one or more control signals for controlling the synchronous rectifiers or other switches of such a transformer arrangement in dependency of the output current flowing in the secondary windings are well known in the art and are therefore not described here.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
EP06405455A 2005-11-02 2006-10-26 Transformator mit Strommessung Withdrawn EP1783788A3 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06405455A EP1783788A3 (de) 2005-11-02 2006-10-26 Transformator mit Strommessung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05405619 2005-11-02
EP06405455A EP1783788A3 (de) 2005-11-02 2006-10-26 Transformator mit Strommessung

Publications (2)

Publication Number Publication Date
EP1783788A2 true EP1783788A2 (de) 2007-05-09
EP1783788A3 EP1783788A3 (de) 2009-03-25

Family

ID=37705772

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06405455A Withdrawn EP1783788A3 (de) 2005-11-02 2006-10-26 Transformator mit Strommessung

Country Status (1)

Country Link
EP (1) EP1783788A3 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101997416A (zh) * 2009-08-11 2011-03-30 台达电子工业股份有限公司 电源模块及其电路板组合
GB2475262A (en) * 2009-11-11 2011-05-18 E2V Tech Isolation transformer having monitor winding passing through primary core assemblies of primary winding
CN102636668A (zh) * 2012-05-10 2012-08-15 山东电力集团公司济南供电公司 一种卡接式传感器
EP2493063A1 (de) 2011-02-24 2012-08-29 DET International Holding Limited Mehrmalige Verwendung eines Stromwandlers
CN102684506A (zh) * 2012-05-09 2012-09-19 广州金升阳科技有限公司 一种提高自激推挽式变换器工作效率的方法及自激推挽式变换器
US9035736B2 (en) 2013-03-27 2015-05-19 General Electric Company Magnetic device having integrated current sensing element and methods of assembling same
EP3982381A1 (de) * 2020-10-06 2022-04-13 Hitachi Energy Switzerland AG Leistungstransformator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4999743A (en) * 1989-09-27 1991-03-12 At&T Bell Laboratories Transformer with included current sensing element
EP1172924A2 (de) * 2000-07-11 2002-01-16 Sony Corporation Schaltnetzteil mit verbessertem Leistungsfaktor mittels Spannungsrückkoppelung
WO2002041483A2 (en) * 2000-11-15 2002-05-23 Peco Ii, Inc. Apparatus and method for measuring dc load current of a switching power supply
US20050068792A1 (en) * 2003-09-30 2005-03-31 Masayuki Yasumura Switching power supply circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4999743A (en) * 1989-09-27 1991-03-12 At&T Bell Laboratories Transformer with included current sensing element
EP1172924A2 (de) * 2000-07-11 2002-01-16 Sony Corporation Schaltnetzteil mit verbessertem Leistungsfaktor mittels Spannungsrückkoppelung
WO2002041483A2 (en) * 2000-11-15 2002-05-23 Peco Ii, Inc. Apparatus and method for measuring dc load current of a switching power supply
US20050068792A1 (en) * 2003-09-30 2005-03-31 Masayuki Yasumura Switching power supply circuit

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101997416A (zh) * 2009-08-11 2011-03-30 台达电子工业股份有限公司 电源模块及其电路板组合
CN101997416B (zh) * 2009-08-11 2013-06-19 台达电子工业股份有限公司 电源模块及其电路板组合
GB2475262A (en) * 2009-11-11 2011-05-18 E2V Tech Isolation transformer having monitor winding passing through primary core assemblies of primary winding
GB2475262B (en) * 2009-11-11 2014-07-23 E2V Tech Uk Ltd Isolation transformer for a cathode heater supply for a microwave source
EP2493063A1 (de) 2011-02-24 2012-08-29 DET International Holding Limited Mehrmalige Verwendung eines Stromwandlers
US9214869B2 (en) 2011-02-24 2015-12-15 Det International Holding Limited Multiple use of a current transformer
CN102684506A (zh) * 2012-05-09 2012-09-19 广州金升阳科技有限公司 一种提高自激推挽式变换器工作效率的方法及自激推挽式变换器
CN102636668A (zh) * 2012-05-10 2012-08-15 山东电力集团公司济南供电公司 一种卡接式传感器
US9035736B2 (en) 2013-03-27 2015-05-19 General Electric Company Magnetic device having integrated current sensing element and methods of assembling same
US9171667B2 (en) 2013-03-27 2015-10-27 General Electric Company Magnetic device having integrated current sensing element and methods of assembling same
EP3982381A1 (de) * 2020-10-06 2022-04-13 Hitachi Energy Switzerland AG Leistungstransformator
WO2022073658A1 (en) * 2020-10-06 2022-04-14 Hitachi Energy Switzerland Ag Power transformer

Also Published As

Publication number Publication date
EP1783788A3 (de) 2009-03-25

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