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WO1986007214A1 - Circuit protecteur pour un bloc d'alimentation - Google Patents

Circuit protecteur pour un bloc d'alimentation Download PDF

Info

Publication number
WO1986007214A1
WO1986007214A1 PCT/EP1986/000276 EP8600276W WO8607214A1 WO 1986007214 A1 WO1986007214 A1 WO 1986007214A1 EP 8600276 W EP8600276 W EP 8600276W WO 8607214 A1 WO8607214 A1 WO 8607214A1
Authority
WO
WIPO (PCT)
Prior art keywords
power supply
electronic switch
transformer
control circuit
during
Prior art date
Application number
PCT/EP1986/000276
Other languages
German (de)
English (en)
Inventor
Erich Geiger
Uwe Hartmann
Original Assignee
Deutsche Thomson-Brandt 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 Deutsche Thomson-Brandt Gmbh filed Critical Deutsche Thomson-Brandt Gmbh
Publication of WO1986007214A1 publication Critical patent/WO1986007214A1/fr

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
    • 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
    • H02H7/1213—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 DC-DC converters
    • 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
    • H02M3/33523—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 with galvanic isolation between input and output of both the power stage and the feedback loop

Definitions

  • the invention is based on a protective circuit for a switched-mode power supply unit, which works as a flyback converter, for supplying electronic devices with a transformer, the primary winding of which is dependent on the load of a driver stage and is controlled by an electronic switch, whose width is modulated by pulses, during a charging phase to an unregulated DC voltage can be connected, a control circuit controlling the driver stage being provided, which changes the duty cycle of the pulses depending on the load on the switching power supply and the unregulated voltage and blocks the electronic switch during a discharge phase.
  • a protective circuit in which, in conjunction with a horizontal deflection circuit with a line transformer in a television receiver, a winding of the line transformer taps an information voltage which is compared in a threshold switch with a reference voltage, when exceeded a monostable Flip-flop is switched on.
  • the flip-flop switches off the driver stage, which blocks the final transistor which supplies the deflection current, so that the latter is protected from excessive current. (DE-PS 27 50 213). After that by the monostable
  • the flip-flop predetermined time constant, the horizontal deflection circuit comes back into operation and is switched off again when the fault information is still present. This process is repeated intermittently until the entire television receiver is switched off after a number of switch-offs.
  • switching power supplies for the power supply of electronic devices, in particular for the power supply of television receiving devices.
  • These work as flyback converters i.e. when the electronic switch, which is usually controlled with line-frequency pulses and is switched on in the manner described in the preamble of the claim, the energy is transmitted to the secondary side of the transformer.
  • Switching power supplies constructed in this way are also provided with a protective circuit which, in the event of excessive current in the electronic switch, is switched off in the manner described above.
  • the requirements are particularly high when switching power supplies are used in television receivers. They should initially have the highest possible control range, ie they should regulate mains voltages from 90V to 264V. The regulation is carried out by changing the duty cycle of the line-frequency control pulses. These switching power supplies are exposed to large load fluctuations, which are caused by the large beam current fluctuations and depending on the delivered low-frequency power. Future use in connection with cameras, screen text decoders and other peripheral devices will result in additional loads on the switching power supply.
  • both the peak value of the charging current flowing through the switched-on electronic switch and through the primary winding of the transformer and the discharge time during which the stored energy is released to the secondary side of the transformer are proportional ⁇ nal of the withdrawn power.
  • the charging time depends on the applied unregulated operating voltage and the power drawn.
  • the transformer should be dimensioned so that the discharge time and the charging time of the switching power supply are the same at maximum power and minimum voltage and thus the highest possible control is achieved and that the discharge phase and the charging phase do not overlap with this power. With the minimum power removed and the maximum unregulated operating voltage, the smallest possible charging time should not be. result in greater charge than discharge.
  • the load fluctuations in a television receiver can be very large due to the strong beam current fluctuations, especially since the contrast-c is set very high in the case of large-format picture tubes.
  • the jet current can be exceeded six to seven times for a short duration, for example for the duration of one or more fields.
  • Both the line amplifier and the power supply must be able to handle this overload without suffering damage.
  • This overload is greater the smaller the internal resistance of the line output stage.
  • This additional power to be applied affects the power supply unit and this would have to be overdimensioned for protection against these brief overloads.
  • the invention has for its object to provide in addition to the static protection circuit, a dynamic protection circuit which also protects the switching power supply of the type specified in the preamble of the claim against short-term overloads. This object is achieved by the invention specified in the patent claim.
  • the invention is described below using an exemplary embodiment of a switching power supply.
  • Figure 1 shows a switching power supply with the notified circuit measure
  • FIG. 2 shows diagrams to explain the mode of operation of the circuit according to FIG. 1.
  • FIG. 1 shows a known flyback switching power supply which generates the stable operating voltages U1 to Un for the television receiver from the unregulated DC voltage UB rectified from the mains voltage UN with the aid of the rectifier 1.
  • the switching power supply consists of a transformer 2 whose primary winding 3 is in series with the electronic switch 4, which is driven with i pulse-width-modulated pulses via the transistor 5 and the push-pull driver stage 6. At the secondary windings 7, the operating voltages Ul to Un are removed.
  • a control circuit 8 ensures a change in the duty cycle of the control pulses.
  • FIG. 2a shows the case of normal operation under extreme conditions for the switching power supply, ie for the case of the lowest unstabilized operating voltage ÜB with maximum power Pmax.
  • the overload case occurs at the time to.
  • the discharge time ie by reducing the di / dt
  • the charging current IL is already switched on again at the time t1, so that after a sustained overload the setpoint voltage US is exceeded after a few cycles and the electronic switch 4 becomes saturated and can be destroyed. Only after the overload has been removed at time t2 does the charging and discharging process return to normal values (FIG. 2b). However, if the overload is longer, it is easy to see that the electronic switch will be destroyed.
  • the registered circuit measure now inevitably prevents a charging process by the charging current IL as long as a discharge current IE is still flowing, ie in the extreme case described, the electronic switch 4 cannot be switched on again until the discharge current IE disappears.
  • This information reaches the transistor 5 via the diodes 10 and 11 and the resistor 12, which also receives the control pulses UT, which are thus partially effective, despite the control with the pulses UT (FIG. 2d) during the time ⁇ no charging current can occur, but the transformer is first completely discharged, which is indicated in FIG. 2c by the broken line.
  • the switched-mode power supply is not completely switched off here, only the regulation to the constant output voltage is deactivated for the duration of the overload. As long as about the 4 "is present, the information resistor 12 ', the electronic switch is" necessarily locked and can not be switched. The final value of the charging current IL is then not reached, so that the target voltage US is not reached and drops somewhat during the overload, but a brief drop in this no longer regulated target voltage is not discernible to the user of the television set. It is achieved with the circuit measure that the switching power supply does not have to be oversized for protection against short-term overload.

Landscapes

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

Abstract

Dans un circuit protecteur du bloc d'alimentation d'appareils électroniques, le transistor de commutation (4) est obligatoirement maintenu à l'état fermé par un circuit de commande (10, 11, 12) jusqu'à ce que le transformateur (2) du bloc d'alimentation soit complètement déchargé.
PCT/EP1986/000276 1985-05-21 1986-05-10 Circuit protecteur pour un bloc d'alimentation WO1986007214A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853518195 DE3518195A1 (de) 1985-05-21 1985-05-21 Schutzschaltung fuer ein schaltnetzteil
DEP3518195.8 1985-05-21

Publications (1)

Publication Number Publication Date
WO1986007214A1 true WO1986007214A1 (fr) 1986-12-04

Family

ID=6271233

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1986/000276 WO1986007214A1 (fr) 1985-05-21 1986-05-10 Circuit protecteur pour un bloc d'alimentation

Country Status (3)

Country Link
EP (1) EP0221974A1 (fr)
DE (1) DE3518195A1 (fr)
WO (1) WO1986007214A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2626419A1 (fr) * 1988-01-21 1989-07-28 Sgs Thomson Microelectronics Dispositif de surveillance de demagnetisation pour alimentation a decoupage a regulation primaire et secondaire
DE3844210A1 (de) * 1988-12-29 1990-07-05 Electronic Werke Deutschland Schaltnetzteil mit ueberlastschutz
EP0385544A1 (fr) * 1989-03-02 1990-09-05 Koninklijke Philips Electronics N.V. Circuit d'alimentation à découpage

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3733474A1 (de) * 1987-09-30 1989-04-20 Thomson Brandt Gmbh Schaltnetzteil
DE4117891A1 (de) * 1991-05-31 1992-12-03 Thomson Brandt Gmbh Schaltnetzteil
DE4431783A1 (de) * 1994-09-07 1996-03-14 Thomson Brandt Gmbh Schaltnetzteil

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2430481A1 (de) * 1973-06-28 1975-01-16 Honeywell Inc Verfahren zum betrieb einer wechselrichterschaltung und schaltungsanordnung zur durchfuehrung des verfahrens
DE2434688A1 (de) * 1973-07-26 1975-02-13 Sits Soc It Telecom Siemens Anlass- und schutzschaltung fuer einen gleichstrom-umrichter mit unsymmetrischem ausgang
FR2259473A1 (en) * 1974-01-28 1975-08-22 Radiotechnique Compelec Ringing-choke power supply - has fast response output regulation and is for computer memory supplies
DE2750213A1 (de) * 1977-11-10 1979-05-17 Loewe Opta Gmbh Schutzschaltung fuer eine gesteuerte generatorschaltung
DE3227174A1 (de) * 1982-07-21 1984-01-26 Trilux-Lenze Gmbh + Co Kg, 5760 Arnsberg Schaltungsanordnung zur erzeugung einer gleichspannung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3742371A (en) * 1971-12-16 1973-06-26 Tektronix Inc Wide range regulated power supply utilizing optimized energy storage
US3859563A (en) * 1973-07-09 1975-01-07 Lumedyne Inc Voltage converter and regulator
DE3312209A1 (de) * 1983-04-05 1984-10-11 Siemens AG, 1000 Berlin und 8000 München Sperrschwinger-schaltnetzteil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2430481A1 (de) * 1973-06-28 1975-01-16 Honeywell Inc Verfahren zum betrieb einer wechselrichterschaltung und schaltungsanordnung zur durchfuehrung des verfahrens
DE2434688A1 (de) * 1973-07-26 1975-02-13 Sits Soc It Telecom Siemens Anlass- und schutzschaltung fuer einen gleichstrom-umrichter mit unsymmetrischem ausgang
FR2259473A1 (en) * 1974-01-28 1975-08-22 Radiotechnique Compelec Ringing-choke power supply - has fast response output regulation and is for computer memory supplies
DE2750213A1 (de) * 1977-11-10 1979-05-17 Loewe Opta Gmbh Schutzschaltung fuer eine gesteuerte generatorschaltung
DE3227174A1 (de) * 1982-07-21 1984-01-26 Trilux-Lenze Gmbh + Co Kg, 5760 Arnsberg Schaltungsanordnung zur erzeugung einer gleichspannung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2626419A1 (fr) * 1988-01-21 1989-07-28 Sgs Thomson Microelectronics Dispositif de surveillance de demagnetisation pour alimentation a decoupage a regulation primaire et secondaire
EP0329571A1 (fr) * 1988-01-21 1989-08-23 STMicroelectronics S.A. Dispositif de surveillance de démagnétisation pour alimentation à découpage à régulation primaire et secondaire
US4885673A (en) * 1988-01-21 1989-12-05 Sgs-Thomson Microelectronics S.A. Demagnetization monitoring device for a switching power supply with a primary and a secondary regulation
DE3844210A1 (de) * 1988-12-29 1990-07-05 Electronic Werke Deutschland Schaltnetzteil mit ueberlastschutz
EP0385544A1 (fr) * 1989-03-02 1990-09-05 Koninklijke Philips Electronics N.V. Circuit d'alimentation à découpage
US5032967A (en) * 1989-03-02 1991-07-16 U.S. Philips Corporation SMPS apparatus having a demagnetization circuit

Also Published As

Publication number Publication date
EP0221974A1 (fr) 1987-05-20
DE3518195A1 (de) 1986-11-27

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