EP0192086A1 - Protection contre les courts-circuits d'un circuit linéaire d'alimentation - Google Patents

Protection contre les courts-circuits d'un circuit linéaire d'alimentation Download PDF

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Publication number
EP0192086A1
EP0192086A1 EP86101081A EP86101081A EP0192086A1 EP 0192086 A1 EP0192086 A1 EP 0192086A1 EP 86101081 A EP86101081 A EP 86101081A EP 86101081 A EP86101081 A EP 86101081A EP 0192086 A1 EP0192086 A1 EP 0192086A1
Authority
EP
European Patent Office
Prior art keywords
transistor
power supply
short
voltage
circuit
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
EP86101081A
Other languages
German (de)
English (en)
Other versions
EP0192086B1 (fr
Inventor
José-Ignacio Rodriguez
Erich Jung
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.)
Deutsche Thomson Brandt GmbH
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
Priority to AT86101081T priority Critical patent/ATE44102T1/de
Publication of EP0192086A1 publication Critical patent/EP0192086A1/fr
Application granted granted Critical
Publication of EP0192086B1 publication Critical patent/EP0192086B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/468—Regulating voltage or current wherein the variable actually regulated by the final control device is dc characterised by reference voltage circuitry, e.g. soft start, remote shutdown
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
    • G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
    • G05F1/573—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector

Definitions

  • the invention relates to a short-circuit-proof power supply that can be switched on electronically at a control terminal.
  • a power supply is required, for example, for the on-screen text (Btx) part of a television receiver.
  • Electronic switch-on is necessary because the power supply unit should only be switched on from the remote control when the screen is in text mode.
  • Known stabilized power supplies generally contain a transistor in the longitudinal path, which is controlled at its base in order to stabilize the output voltage.
  • the collector of another transistor is connected to the base, a reference voltage of - a Zener diode is applied to its emitter and a part of the output voltage is applied to its base as a control variable for stabilization.
  • the invention has for its object to provide a power supply of the type described with simple circuit means so that it can be switched on electronically and is protected against short-circuit at its output.
  • the circuit according to the invention requires only a few components, since the interaction of the components used at the same time ensures electronic activation and protection against a short circuit at the output. Additional short-circuit fuses with thyristors that have been used up to now are not required.
  • the power supply is switched on slowly, also called “soft", because initially in an advantageous manner. the charging capacitor is charged at the output and only then the actual one Power supply is switched on.
  • the power supply unit shown in the figure receives an unstabilized DC voltage of approximately 6.9-7.6 V at input terminal 1.
  • a stabilized DC voltage of + 5 V is present at output terminal 2.
  • the power supply contains a known stabilization circuit with transistors T3 and T4, resistors R5, R6, R7, R8 and Zener diodes D3 and D4.
  • the Zener diode D3 supplies the reference voltage at the emitter of the transistor T4.
  • the control voltage proportional to the output voltage is derived from the tapping of resistors R7, R8 and controls transistor T3 at the base via transistor T4 in the sense of stabilization.
  • the smoothing capacitor C1 and the protective resistor R1 are also connected to input terminal 1.
  • the additional circuit for the electronic switch-on and the short-circuit protection of the power supply consists of the transistors T1, T2, the resistors R2, R3, the capacitor C2 and the diodes D1, D2.
  • a remote control applies a voltage of + 5 V to control terminal 3.
  • the capacitor C2 now charges via the diode D2 and the capacitor C3 discharged up to that point.
  • the diode D2 blocks and thus disconnects the base of the transistor T2 from the charging capacitor C3.
  • the charging capacitor C3 already has a voltage of + 0.6V.
  • the power supply is initially switched off by the transistors T1 and T3.
  • the charging current for the capacitor C2 now continues to flow via the base / emitter path of the transistor T2 and the diode D1.
  • the transistor T2 thereby becomes conductive and generates a base current at the transistor T1.
  • the transistor T1 also becomes conductive, that is, it switches fully through, so that the entire control circuit shown begins to work with the transistors T3, T4. There is now a stabilized voltage of + 5V at output terminal 2.
  • the cathode of diode D2 is connected to earth, so that diode D2 conducts and the forward voltage of diode D2 of approximately 0.6 V is at the base of transistor T2.
  • the transistor T2 is conducting, however, would have the necessary for switching the base / E-emitter voltage and the forward voltage of the diode D1 to be overcome.
  • the sum of the last two voltages is greater than 0.6V.
  • the transistor T2 is therefore blocked.
  • the base of the transistor T1 is then no longer activated, so that the transistor T1 blocks and the control circuit with the transistors T3, T4 no longer receives any voltage.
  • the voltage at the output terminal 2 then breaks down as desired, so that the short circuit does not endanger components.
  • the device When the short circuit has been eliminated, the device is switched on as described. It is advantageous with this circuit that when the transistor T1 is switched on and thus the control circuit is started, the charging capacitor C3 is already open a voltage of + 0.6V is charged. If the capacitor C3 were discharged at this point in time, the circuit would immediately register a short circuit at the output and switch it off again when it was switched on.
  • the charging processes described result in a desired smooth switching on of the voltage at terminal 2 with a certain delay.
  • the switch-off effected with the transistor T1 can also take place with the transistor T3, so that the transistor T1 could then be saved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Dc-Dc Converters (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)
EP86101081A 1985-02-21 1986-01-28 Protection contre les courts-circuits d'un circuit linéaire d'alimentation Expired EP0192086B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86101081T ATE44102T1 (de) 1985-02-21 1986-01-28 Kurzschlusssicherung eines linearnetzteiles.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3505986 1985-02-21
DE19853505986 DE3505986A1 (de) 1985-02-21 1985-02-21 Kurzschlussfestes netzteil, insbesondere fuer einen fernsehempfaenger

Publications (2)

Publication Number Publication Date
EP0192086A1 true EP0192086A1 (fr) 1986-08-27
EP0192086B1 EP0192086B1 (fr) 1989-06-14

Family

ID=6263127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86101081A Expired EP0192086B1 (fr) 1985-02-21 1986-01-28 Protection contre les courts-circuits d'un circuit linéaire d'alimentation

Country Status (7)

Country Link
US (1) US4677519A (fr)
EP (1) EP0192086B1 (fr)
JP (1) JPS61240309A (fr)
AT (1) ATE44102T1 (fr)
DE (2) DE3505986A1 (fr)
HK (1) HK79990A (fr)
SG (1) SG65490G (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2672951B2 (ja) * 1987-10-20 1997-11-05 株式会社芝浦製作所 スイッチング駆動回路
ATE112868T1 (de) * 1988-12-21 1994-10-15 Siemens Ag Integrierbare schaltungsanordnung zur rückstromverringerung bei einem invers betriebenen transistor.
JPH02183817A (ja) * 1989-01-11 1990-07-18 Toshiba Corp 電源装置
JPH03107724U (fr) * 1990-02-19 1991-11-06
KR0150118B1 (ko) * 1995-06-02 1998-10-15 김광호 컴퓨터와 주변기기 접속시의 서지 노이즈 방지 장치
CN100349346C (zh) * 2002-06-10 2007-11-14 广达电脑股份有限公司 自动栓断电源保护装置
AU2002950581A0 (en) * 2002-08-02 2002-09-12 Wayne Callen Electrical safety circuit
CN107168436A (zh) * 2017-06-20 2017-09-15 合肥威艾尔智能技术有限公司 一种基于双闭环调节的双重稳压电源电路

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3109980A (en) * 1959-05-29 1963-11-05 North American Aviation Inc Short circuit protection device
US3517264A (en) * 1966-12-30 1970-06-23 Texas Instruments Inc Apparatus for protecting a d.c. load
DE1588103A1 (de) * 1967-06-02 1970-05-14 Huels Chemische Werke Ag Schnelle elektronische Kurzschlusssicherung
IT1067179B (it) * 1976-07-07 1985-03-12 Sits Soc It Telecom Siemens Fusibile elettronico
JPS56127214A (en) * 1980-03-11 1981-10-05 Toshiba Corp Power supply circuit
US4494164A (en) * 1982-04-02 1985-01-15 Ampex Corporation Overload protection device
US4530023A (en) * 1983-06-27 1985-07-16 Motorola, Inc. Solid state interrupt circuit
DE3331823A1 (de) * 1983-09-01 1985-03-21 Siemens AG, 1000 Berlin und 8000 München Stromversorgungseinrichtung fuer einen ueberstromausloeser

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ELECTRONIC DESIGN, Band 18, Nr. 8, 12. April 1970, Seite 105, Rochelle Park, US; D.E. O'N WADDINGTON: "Diode protects power supply from short circuits" *
IBM TECHNICAL DISCLOSURE BULLETIN, Band 23, Nr. 8, Januar 1981, Seiten 3655-3656, New York, US; H. KOZAK: "Dual voltage regulator" *
PATENTS ABSTRACTS OF JAPAN, Band 7, Nr. 290 (P-245) [1435], 24. Dezember 1983; & JP - A - 58 163 028 (MATSUSHITA DENKI SANGYO K.K.) 27-09-1983 *

Also Published As

Publication number Publication date
DE3505986A1 (de) 1986-08-21
DE3664009D1 (en) 1989-07-20
SG65490G (en) 1990-12-21
HK79990A (en) 1990-10-12
US4677519A (en) 1987-06-30
JPS61240309A (ja) 1986-10-25
ATE44102T1 (de) 1989-06-15
EP0192086B1 (fr) 1989-06-14

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