GB2290889A - A method for limiting the output current of a switched-mode power supply of flyback type in overload situations,and a switched-mode power supply of flyback ty - Google Patents

A method for limiting the output current of a switched-mode power supply of flyback type in overload situations,and a switched-mode power supply of flyback ty

Info

Publication number
GB2290889A
GB2290889A GB9518863A GB9518863A GB2290889A GB 2290889 A GB2290889 A GB 2290889A GB 9518863 A GB9518863 A GB 9518863A GB 9518863 A GB9518863 A GB 9518863A GB 2290889 A GB2290889 A GB 2290889A
Authority
GB
United Kingdom
Prior art keywords
power supply
switched
mode power
output current
flyback
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
GB9518863A
Other versions
GB2290889B (en
GB9518863D0 (en
Inventor
Goesta Baarman
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 GB9518863D0 publication Critical patent/GB9518863D0/en
Publication of GB2290889A publication Critical patent/GB2290889A/en
Application granted granted Critical
Publication of GB2290889B publication Critical patent/GB2290889B/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
    • H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H02H7/1227—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to abnormalities in the output circuit, e.g. short circuit

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention relates to a method for limiting the output current (Iout) of a switched-mode power supply of flyback type in overload situations and to a switched-mode power supply of flyback type. In accordance with the method, the output current (Iout) is limited by means of pulse width modulation (PWM) by adjusting, by means of a control circuit (13) known per se, the ratio of the duration of the ON and OFF phases of the switch (SW) of the primary circuit. In order for the output current not to increase inordinately in overload situations, the voltage (Vs) which is present on the primary side of the transformer (10) and which is dependant on the output voltage (Uout) of the power supply is utilized to control a current generator (21), and output current (Icc) of which is used to form a control signal for the control circuit (13). <IMAGE>
GB9518863A 1993-03-15 1994-03-11 Current limitation in a switched-mode power supply of flyback type Expired - Fee Related GB2290889B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI931137A FI92892C (en) 1993-03-15 1993-03-15 Method for limiting the output current of a flyback type switch mode power supply in overload situations and a flyback type switch mode power supply
PCT/FI1994/000090 WO1994022207A1 (en) 1993-03-15 1994-03-11 A method for limiting the output current of a switched-mode power supply of flyback type in overload situations, and a switched-mode power supply of flyback type

Publications (3)

Publication Number Publication Date
GB9518863D0 GB9518863D0 (en) 1995-11-22
GB2290889A true GB2290889A (en) 1996-01-10
GB2290889B GB2290889B (en) 1996-07-17

Family

ID=8537548

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9518863A Expired - Fee Related GB2290889B (en) 1993-03-15 1994-03-11 Current limitation in a switched-mode power supply of flyback type

Country Status (6)

Country Link
AU (1) AU6209294A (en)
DE (1) DE4491577T1 (en)
FI (1) FI92892C (en)
GB (1) GB2290889B (en)
SE (1) SE511444C2 (en)
WO (1) WO1994022207A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT406319B (en) * 1995-10-24 2000-04-25 Siemens Ag Oesterreich LOCK CONVERTER
WO2003003554A1 (en) * 2001-06-29 2003-01-09 Koninklijke Philips Electronics N.V. Current mode controlled switched mode power supply
CN1452308A (en) * 2002-04-18 2003-10-29 姜涛 Environment protection switch power supply
DE60318889T2 (en) * 2002-11-07 2009-01-15 Nxp B.V. POWER SUPPLY
AT506273B1 (en) * 2007-12-20 2012-03-15 Siemens Ag METHOD FOR OPERATING A SWITCHING TRANSFORMER

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4425611A (en) * 1981-10-16 1984-01-10 Rca Corporation Switching voltage regulators with output voltages indirectly regulated respective to directly regulated boosted input voltages
US4908755A (en) * 1988-03-25 1990-03-13 Siemens Aktiengesellschaft Method and circuit for limiting the output current of a flyback converter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4425611A (en) * 1981-10-16 1984-01-10 Rca Corporation Switching voltage regulators with output voltages indirectly regulated respective to directly regulated boosted input voltages
US4908755A (en) * 1988-03-25 1990-03-13 Siemens Aktiengesellschaft Method and circuit for limiting the output current of a flyback converter

Also Published As

Publication number Publication date
AU6209294A (en) 1994-10-11
DE4491577T1 (en) 1996-02-22
SE511444C2 (en) 1999-10-04
GB2290889B (en) 1996-07-17
WO1994022207A1 (en) 1994-09-29
FI92892B (en) 1994-09-30
SE9503099D0 (en) 1995-09-09
SE9503099L (en) 1995-09-08
FI931137A0 (en) 1993-03-15
GB9518863D0 (en) 1995-11-22
FI92892C (en) 1995-01-10

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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: 20110311