GB2298500A - Switched-mode power supply - Google Patents

Switched-mode power supply

Info

Publication number
GB2298500A
GB2298500A GB9607227A GB9607227A GB2298500A GB 2298500 A GB2298500 A GB 2298500A GB 9607227 A GB9607227 A GB 9607227A GB 9607227 A GB9607227 A GB 9607227A GB 2298500 A GB2298500 A GB 2298500A
Authority
GB
United Kingdom
Prior art keywords
power supply
primary
transformer
switch
switched
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.)
Granted
Application number
GB9607227A
Other versions
GB2298500B (en
GB9607227D0 (en
Inventor
Matti Tuominen
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.)
Nokia Oyj
Original Assignee
Nokia Telecommunications Oy
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 Nokia Telecommunications Oy filed Critical Nokia Telecommunications Oy
Publication of GB9607227D0 publication Critical patent/GB9607227D0/en
Publication of GB2298500A publication Critical patent/GB2298500A/en
Application granted granted Critical
Publication of GB2298500B publication Critical patent/GB2298500B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Ac-Ac Conversion (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention relates to a switched-mode power supply comprising (a) a transformer (T1) which is provided with primary and secondary windings (N, N1, N2) and through which power is transferred from the primary to the secondary, the transformer (T1) comprising at least two secondary windings (N1, N2) for forming at least two separate outputs for the power supply; (b) a first switch (SW1) provided in the primary circuit for chopping a primary current flowing through the primary winding (N) of the transformer; and (c) an adjustment circuit (13) controlling said first switch (SW1) and adjusting output voltage of the power supply by pulse width modulation by varying the ratio between the durations of the ON and OFF periods of the switch (SW1). In order that desired output voltages could be generated with a very high accuracy without significant power losses, an autotransformer (T2) known per se is connected after at least one of the secondary windings (N3).
GB9607227A 1993-10-11 1994-10-10 Switched-mode power supply Expired - Fee Related GB2298500B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI934477A FI94198C (en) 1993-10-11 1993-10-11 Switch Mode Power Supply
PCT/FI1994/000454 WO1995010877A1 (en) 1993-10-11 1994-10-10 Switched-mode power supply

Publications (3)

Publication Number Publication Date
GB9607227D0 GB9607227D0 (en) 1996-06-26
GB2298500A true GB2298500A (en) 1996-09-04
GB2298500B GB2298500B (en) 1997-07-16

Family

ID=8538748

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9607227A Expired - Fee Related GB2298500B (en) 1993-10-11 1994-10-10 Switched-mode power supply

Country Status (5)

Country Link
AU (1) AU7814594A (en)
DE (1) DE4497667T1 (en)
FI (1) FI94198C (en)
GB (1) GB2298500B (en)
WO (1) WO1995010877A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6046576A (en) * 1998-05-04 2000-04-04 Lucent Technologies Inc. Boost converter having reduced output voltage and method of operation thereof
FR2912567B1 (en) * 2007-02-13 2009-05-01 Hispano Suiza Sa UNIPOLAR OR BIPOLAR CUTTING CONVERTER HAVING THREE MAGNETICALLY COUPLED WINDINGS.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0254875A2 (en) * 1986-07-10 1988-02-03 Deutsche Thomson-Brandt GmbH Circuit arrangement for the supply of current to electronic devices

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0254875A2 (en) * 1986-07-10 1988-02-03 Deutsche Thomson-Brandt GmbH Circuit arrangement for the supply of current to electronic devices

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM Technical Disclosure Bulletin Vol. 24, No. 11b, April 1982, pages 6207-6208 *

Also Published As

Publication number Publication date
DE4497667T1 (en) 1996-10-17
WO1995010877A1 (en) 1995-04-20
FI934477A0 (en) 1993-10-11
FI94198B (en) 1995-04-13
AU7814594A (en) 1995-05-04
GB2298500B (en) 1997-07-16
FI94198C (en) 1995-07-25
GB9607227D0 (en) 1996-06-26

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20031010