GB1212318A - Overload protection circuit - Google Patents

Overload protection circuit

Info

Publication number
GB1212318A
GB1212318A GB2479169A GB2479169A GB1212318A GB 1212318 A GB1212318 A GB 1212318A GB 2479169 A GB2479169 A GB 2479169A GB 2479169 A GB2479169 A GB 2479169A GB 1212318 A GB1212318 A GB 1212318A
Authority
GB
United Kingdom
Prior art keywords
transistor
circuit
resistor
current
transistors
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
GB2479169A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1212318A publication Critical patent/GB1212318A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H02H3/08—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 excess current
    • 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
    • H02H3/08—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 excess current
    • H02H3/087—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 excess current for dc applications

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Amplifiers (AREA)
  • Dc-Dc Converters (AREA)
  • Bipolar Integrated Circuits (AREA)

Abstract

1,212,318. Protective arrangements. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 15 May, 1969 [18 May, 1968], No. 24791/69. Heading H2K. A two-terminal network for automatically interrupting a circuit when the current becomes excessive, comprises the series combination of a resistor 6, .a PNP transistor 16 and a NPN transistor 17, the transistor 16 having an additional collector connected through a voltage threshold device 18 to the terminal of the resistor 6 remote from the transistors. When the current is excessive, the voltage drop across the resistor 6 and the base-emitter circuit of the transistor 17 is sufficient to cause the device 18 to breakdown so that the additional collector of the transistor 16 intercepts the current to the normal collector and switches off the transistors. The device 18 may be formed by series-connected diodes. The network may be made as an integrated circuit, Fig. 5 (not shown), and two oppositely poled parallel networks may be used to protect an A.C. circuit, Figs. 6 and 7 (not shown).
GB2479169A 1968-05-18 1969-05-15 Overload protection circuit Expired GB1212318A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6807092A NL6807092A (en) 1968-05-18 1968-05-18

Publications (1)

Publication Number Publication Date
GB1212318A true GB1212318A (en) 1970-11-11

Family

ID=19803676

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2479169A Expired GB1212318A (en) 1968-05-18 1969-05-15 Overload protection circuit

Country Status (5)

Country Link
AT (1) AT288519B (en)
ES (1) ES367328A1 (en)
FR (1) FR2008826A1 (en)
GB (1) GB1212318A (en)
NL (1) NL6807092A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2234871A (en) * 1989-07-25 1991-02-13 Int Rectifier Corp Power delivery circuit with over current detection

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE430450B (en) * 1979-04-03 1983-11-14 Asea Ab TWO-POLE OVERCURRENT PROTECTION FOR CONNECTION IN A POWER-CARRYING WIRE
DE2935666C2 (en) * 1979-09-01 1983-03-10 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Arrangement for limiting the collector-emitter voltage of transistor power switches in the event of overload
DE3309492A1 (en) * 1983-03-14 1984-09-20 Siemens AG, 1000 Berlin und 8000 München ARRANGEMENT WITH A SWITCHING TRANSISTOR

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2234871A (en) * 1989-07-25 1991-02-13 Int Rectifier Corp Power delivery circuit with over current detection

Also Published As

Publication number Publication date
DE1924782A1 (en) 1969-11-27
FR2008826A1 (en) 1970-01-23
NL6807092A (en) 1969-11-20
AT288519B (en) 1971-03-10
DE1924782B2 (en) 1976-05-13
ES367328A1 (en) 1971-04-01

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Legal Events

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