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GB1449607A - Electrical power supply systems - Google Patents

Electrical power supply systems

Info

Publication number
GB1449607A
GB1449607A GB4551072A GB4551072A GB1449607A GB 1449607 A GB1449607 A GB 1449607A GB 4551072 A GB4551072 A GB 4551072A GB 4551072 A GB4551072 A GB 4551072A GB 1449607 A GB1449607 A GB 1449607A
Authority
GB
United Kingdom
Prior art keywords
output
voltage
current
power supply
scr3
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
GB4551072A
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.)
DAVIS SON DERBY Ltd JOHN
Original Assignee
DAVIS SON DERBY Ltd JOHN
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 DAVIS SON DERBY Ltd JOHN filed Critical DAVIS SON DERBY Ltd JOHN
Priority to GB4551072A priority Critical patent/GB1449607A/en
Publication of GB1449607A publication Critical patent/GB1449607A/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
    • H02H3/02—Details
    • H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
    • H02H3/023—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order by short-circuiting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/008—Intrinsically safe circuits

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

1449607 Over-voltage and over-current protection circuits JOHN DAVIS & SON (DERBY) Ltd 3 Oct 1973 [3 Oct 1972] 45510/72 Heading H2H A power supply circuit is made intrinsically safe, even in a two-fault condition, by means of three clamp circuits, connected across the output and operated in response to excess current. As described, the A.C. supply is rectified at W1 and fed to a series regulator comprising transistors TR1...TR3 which provide 15V at the output CD. In the event of excess output current, the voltage across R5 is sufficient to trigger thyristors SCR1...SCR3 which shunt Zener diodes ZD1, ZD3 across the output so as to reduce the voltage to 8V. This action also turns on transistor TR4 which shunts the reference Zener diode ZD1<SP>1</SP>, so that the transistors TR1...TR3 reduce the output voltage sufficiently to turn off SCR1...SCR3 when the excessive output current has ceased. Zener diodes ZD4, ZD5 provide protection against excessive output voltage.
GB4551072A 1972-10-03 1972-10-03 Electrical power supply systems Expired GB1449607A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4551072A GB1449607A (en) 1972-10-03 1972-10-03 Electrical power supply systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4551072A GB1449607A (en) 1972-10-03 1972-10-03 Electrical power supply systems

Publications (1)

Publication Number Publication Date
GB1449607A true GB1449607A (en) 1976-09-15

Family

ID=10437490

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4551072A Expired GB1449607A (en) 1972-10-03 1972-10-03 Electrical power supply systems

Country Status (1)

Country Link
GB (1) GB1449607A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2937298A1 (en) * 1979-09-12 1981-04-02 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Power pack for mining equipment with built-in protection - has low ripple and includes output limiting inductance and clamping diodes controlling FET
GB2145858A (en) * 1983-08-27 1985-04-03 Hunslett Monitoring system
GB2176956A (en) * 1985-06-28 1987-01-07 Sgs Microelettronica Spa Voltage and current transient protection
GB2253956A (en) * 1991-03-19 1992-09-23 Meco Electronics Ltd A fast acting protection device for use with a power supply
GB2336046A (en) * 1998-04-03 1999-10-06 Harris Corp Overcurrent protection
EP1701423A2 (en) 2005-03-03 2006-09-13 Airbus Deutschland GmbH Arrangement for improving the short circuit withstandability of an appliance by use of a bypass
WO2008122339A1 (en) * 2007-04-04 2008-10-16 Stahl Schaltgeräte Gmbh Circuit arrangement for limiting voltage
US7778000B2 (en) 2005-03-03 2010-08-17 Airbrush Deutschland GmbH Measure for increasing the short-circuit resistance of a device by introducing parallel current paths

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2937298A1 (en) * 1979-09-12 1981-04-02 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Power pack for mining equipment with built-in protection - has low ripple and includes output limiting inductance and clamping diodes controlling FET
GB2145858A (en) * 1983-08-27 1985-04-03 Hunslett Monitoring system
GB2176956A (en) * 1985-06-28 1987-01-07 Sgs Microelettronica Spa Voltage and current transient protection
GB2253956A (en) * 1991-03-19 1992-09-23 Meco Electronics Ltd A fast acting protection device for use with a power supply
GB2253956B (en) * 1991-03-19 1994-09-14 Meco Electronics Ltd A fast acting protection device for use with a power supply
GB2336046B (en) * 1998-04-03 2002-04-17 Harris Corp High current protection for telephone interface
GB2336046A (en) * 1998-04-03 1999-10-06 Harris Corp Overcurrent protection
US6418222B2 (en) 1998-04-03 2002-07-09 Harris Corporation High current protection circuit for telephone interface
EP1701423A2 (en) 2005-03-03 2006-09-13 Airbus Deutschland GmbH Arrangement for improving the short circuit withstandability of an appliance by use of a bypass
EP1701423A3 (en) * 2005-03-03 2008-12-03 Airbus Deutschland GmbH Arrangement for improving the short circuit withstandability of an appliance by use of a bypass
US7778000B2 (en) 2005-03-03 2010-08-17 Airbrush Deutschland GmbH Measure for increasing the short-circuit resistance of a device by introducing parallel current paths
WO2008122339A1 (en) * 2007-04-04 2008-10-16 Stahl Schaltgeräte Gmbh Circuit arrangement for limiting voltage
US8649145B2 (en) 2007-04-04 2014-02-11 R. Stahl Schaltgerate Gmbh Circuit arrangement for limiting a voltage

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Legal Events

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