GB1402386A - Protective circuits - Google Patents

Protective circuits

Info

Publication number
GB1402386A
GB1402386A GB4222673A GB4222673A GB1402386A GB 1402386 A GB1402386 A GB 1402386A GB 4222673 A GB4222673 A GB 4222673A GB 4222673 A GB4222673 A GB 4222673A GB 1402386 A GB1402386 A GB 1402386A
Authority
GB
United Kingdom
Prior art keywords
emitter
transistor
power supply
supply
voltage
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.)
Expired
Application number
GB4222673A
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.)
Bodenseewerk Geratetechnik GmbH
Original Assignee
Bodenseewerk Geratetechnik 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 Bodenseewerk Geratetechnik GmbH filed Critical Bodenseewerk Geratetechnik GmbH
Publication of GB1402386A publication Critical patent/GB1402386A/en
Expired legal-status Critical Current

Links

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
    • G05F1/56—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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Electronic Switches (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Dc-Dc Converters (AREA)
  • Power Conversion In General (AREA)

Abstract

1402386 Electric protective systems BODENSEEWERK GERATETECHNIK GmbH 7 Sept 1973 [4 Oct 1972] 42226/73 Heading H2K A protective circuit for a voltage regulated power supply includes an optical coupler comprising a radiation sensitive element 24 and a co-operating radiation emitter 26; the emitter being energizable by the output voltage of the power supply and the element 24 is arranged to inhibit the output of the power supply if radiation from the emitter 26 ceases. The emitter 26 is a luminescent diode and the element 24 is a phototransistor. Voltage regulation is effected by a differential amplifier 10 using a reference voltage from a source 14. The supply includes a bridge rectifier 1 fed from a transformer secondary 4 which has other secondaries 5, (6, Fig. 2, not shown), feeding other supply lines arranged, on voltage drop, to short circuit the emitter 26 by a transistor 50 or diode 46 and since the control amplifiers 42, 40 of these supplies receive their reference voltages from the supply through transistor 18 these supplies are also interrupted when the first mentioned power supply is inhibited. When the photo transistor 24 ceases to conduct the amplifier 10 is saturated and charges a capacitor 28 until a Schottky diode 32 breaks down to turn transistor 16 on to make transistor 18 reconnect the supply which will be maintained if the fault is no longer present so that the emitter 26 operated the photo transistor 24.
GB4222673A 1972-10-04 1973-09-07 Protective circuits Expired GB1402386A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722248602 DE2248602C3 (en) 1972-10-04 1972-10-04 Circuit arrangement for securing voltage-regulated power supplies

Publications (1)

Publication Number Publication Date
GB1402386A true GB1402386A (en) 1975-08-06

Family

ID=5858127

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4222673A Expired GB1402386A (en) 1972-10-04 1973-09-07 Protective circuits

Country Status (3)

Country Link
DE (1) DE2248602C3 (en)
GB (1) GB1402386A (en)
IT (1) IT993995B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2236919A (en) * 1989-10-04 1991-04-17 Kone Elevator Gmbh Overload and short-circuit protection of electric output drivers
US5091816A (en) * 1989-10-10 1992-02-25 Kone Elevator Gmbh Procedure and device for overload and short-circuit protection of output drivers
GB2259617A (en) * 1991-09-10 1993-03-17 Matsushita Electric Ind Co Ltd Protecting a power supply circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2236919A (en) * 1989-10-04 1991-04-17 Kone Elevator Gmbh Overload and short-circuit protection of electric output drivers
GB2236919B (en) * 1989-10-04 1994-03-30 Kone Elevator Gmbh Overload and short-circuit protection circuit
US5091816A (en) * 1989-10-10 1992-02-25 Kone Elevator Gmbh Procedure and device for overload and short-circuit protection of output drivers
GB2259617A (en) * 1991-09-10 1993-03-17 Matsushita Electric Ind Co Ltd Protecting a power supply circuit
US5381294A (en) * 1991-09-10 1995-01-10 Matsushita Electric Industrial Co., Ltd. Device for protecting power supply circuit
GB2259617B (en) * 1991-09-10 1995-08-02 Matsushita Electric Ind Co Ltd Device for protecting power supply circuit

Also Published As

Publication number Publication date
DE2248602C3 (en) 1979-05-10
IT993995B (en) 1975-09-30
DE2248602B2 (en) 1978-09-14
DE2248602A1 (en) 1974-04-18

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee