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WO1998023019A1 - Limiteur de tension pour la ligne d'alimentation - Google Patents

Limiteur de tension pour la ligne d'alimentation Download PDF

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Publication number
WO1998023019A1
WO1998023019A1 PCT/GB1997/003161 GB9703161W WO9823019A1 WO 1998023019 A1 WO1998023019 A1 WO 1998023019A1 GB 9703161 W GB9703161 W GB 9703161W WO 9823019 A1 WO9823019 A1 WO 9823019A1
Authority
WO
WIPO (PCT)
Prior art keywords
surge protector
voltage
current
feed line
circuit
Prior art date
Application number
PCT/GB1997/003161
Other languages
English (en)
Inventor
Anthony John Farrar
Basil Bernard Foster
Original Assignee
Alcatel Alsthom Compagnie Generale D'electricite
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 Alcatel Alsthom Compagnie Generale D'electricite filed Critical Alcatel Alsthom Compagnie Generale D'electricite
Publication of WO1998023019A1 publication Critical patent/WO1998023019A1/fr

Links

Classifications

    • 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
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/025—Current limitation using field effect transistors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/06—Arrangements for supplying operative power

Definitions

  • This invention relates to a surge protector for a power feed line and more particularly to such a protector in which an interference pulse is prevented from increasing line current above a predetermined threshold value.
  • This invention has resulted from the consideration of requirements for a unit suitable for connection in series with the output of a power feed equipment (PFE) , normally to drop low voltage .
  • PFE power feed equipment
  • a surge protector in which a predetermined threshold detector is arranged to provide a compensating voltage drop in opposition to a current surge on a power feed line.
  • the voltage drop may be applied by a power FET.
  • the unit may be arranged to be self protecting by arranging that the voltage drop is limited to a value safe for the voltage drop controlling device. Further protection may be arranged to limit the duration of the drop safe for a particular device. The duration for one specific application may be lOmS at 200V progressively increasing for lower drop voltages .
  • the surge protector may be self powered and a two terminal device control circuit may be powered from a DC/DC converter itself powered from across a diode string which is in series with the line before it is connected to the FET. Such an arrangement avoids any requirement for an auxiliary supply which is difficult to arrange with a Unit in the high-voltage PFE line.
  • the use of threshold current detection rather than rate-of rise of a current surge is particularly advantageous.
  • This 2 -terminal self-powered Compensator is designed to be connected in series with the output of a PFE, such as is employed for powering equipment employed in undersea optical communication systems, and is connected in the high-voltage line. Normally it drops only about 5V at a nominal 1.6A PFE output current employed in such a system. If an external interference pulse attempts to increase the current beyond a pre-set threshold above the nominal current, then the circuit increases its resistance to keep the current at the threshold for the duration of the pulse.
  • the circuit is self-protecting in that it has a maximum drop of nominal 200V, and it caters for a maximum pulse duration of nominal lOmS before reverting to a low drop.
  • the configuration must be such that the 30V Zener chain in the PFE Earth Isolation Shelf connected between System Earth and Station Earth does not bridge the possible 200V dropped by the compensator.
  • the conventional current path is from supply terminal TP1, through a diode chain 10 comprising diodes Dl, D2, D3 , D4 , a power field effect transistor TR1, resistor R4 and out from negative supply terminal TP2.
  • a nominal and reasonably constant 3V dropped across the diode chain powers a DC-DC converter 11 formed by transistors TR2 , TR3 , ferrite transformer Tl and associated components.
  • the transformer output is rectified by diodes D5 and D6, giving nominal 9V DC across C4.
  • This 9V feeds a zener diode ZD1 via a resistor R5 to provide an accurate 2.45V source, and powers a threshold detector 15 and operational amplifier circuit 16 including integrated circuit amplifier IC2.
  • a non-inverting input of IC2 is a reference voltage derived via a potentiometer chain 12 comprising resistor R7, potentiometer RV1 and resistor R8 from the accurate 2.45V source ZD1. The reference may be adjusted with RV1 from nominal 1.50 to 1.80V.
  • An inverting input to IC2 is taken from the voltage drop across a 1 Ohm current sensing resistor R4 through which substantially all of the line current passes excepting several mA in IC2, reference circuit and the later-described protection circuits. Note that there is an offset due to resistor R9 so that the aforementioned reference voltage would balance a voltage drop range in R4 of about 1.37 to 1.70V.
  • the circuit keeps the current near the threshold by adjusting FET conduction, i.e. by increasing FET voltage drop to compensate for the interference pulse which is attempting to increase the current from the PFE into the Cable System.
  • Loop stabilisation is provided by resistor RIO and capacitor C5 and the gate capacitance (several nF) of FET TR1. Loop gain is limited by resistor R9.
  • a Zener chain 14 comprising four zener diodes ZD13, ZD14, ZD15, ZD16 each defining a 51 volt drop starts to conduct at nominal 200V, causing a transistor TR5 to conduct and clamp down the feedback signal at the inverting input to IC2. Hence control is taken away from the current control loop, thereby causing IC2 to turn on the FET further. This action is in itself a control loop which causes the circuit to act as a large approximately 200V Zener diode, limiting the drop to this value. Diodes D17 and D18 safely conduct a sudden pulse during the response time of IC2 etc.
  • Such a voltage drop causes resistor R13 to bias Zener diodes ZDll to 10V so that a resistor R14 and diode Dll conduct to turn on a light emitting diode LED 12 which glows brightly. This is useful in setting-up and diagnosis where a pulse of 200V is indicated by a bright flash.
  • diode D19 conducts into the Zener chain 14 which acts as a simple diode chain, conducting safely at low voltage.
  • Protection can be required against prolonged high voltage drop caused by the current control loop threshold being less than the PFE current. Such may occur during setting-up of RVI or even of the PFE on site.
  • the FET TR1 junction dissipates over 300W at 200V, so there is a further circuit to limit the duration.
  • resistor R15 charges a capacitor C7, taking nominal lOmS to reach 0.65V at which point a transistor TR4 conducts and takes over control of the FET TR1 in the same way as described for TR5. Hence the voltage drop is reduced, and values are such that the steady voltage drop remains at nominal 12V until the external circuit no longer maintains this voltage and TR4 lets go and current falls below the threshold and the current control loop again takes control. With this nominal 12V drop, R13 passes sufficient current to illuminate D12 dimly, indicating control via TR4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

L'invention concerne un limiteur de tension présentant ue détecteur (15) à seuil prédéterminé, qui est configuré de sorte qu'il fournit une chute de tension de compensation en opposition à une pointe de courant dans une ligne d'alimentation. Le compensateur peut être monté en série avec la sortie d'un matériel d'alimentation du type utilisé pour alimenter l'équipement employé dans les systèmes de communication optiques sous-marins.
PCT/GB1997/003161 1996-11-18 1997-11-18 Limiteur de tension pour la ligne d'alimentation WO1998023019A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9623912.4 1996-11-18
GBGB9623912.4A GB9623912D0 (en) 1996-11-18 1996-11-18 Surge protector for power feed line

Publications (1)

Publication Number Publication Date
WO1998023019A1 true WO1998023019A1 (fr) 1998-05-28

Family

ID=10803077

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/003161 WO1998023019A1 (fr) 1996-11-18 1997-11-18 Limiteur de tension pour la ligne d'alimentation

Country Status (2)

Country Link
GB (1) GB9623912D0 (fr)
WO (1) WO1998023019A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012024014A1 (fr) * 2010-06-08 2012-02-23 Belkin International, Inc. Limiteur de surtension et procédé destiné à le produire
US8587148B2 (en) 2008-04-22 2013-11-19 Belkin International, Inc. Electric power supply and related methods
US8742943B2 (en) 2010-02-04 2014-06-03 Belkin International, Inc. Ground detection circuit and method of manufacturing the same
US8890372B2 (en) 2010-01-05 2014-11-18 Belkin International, Inc. Power supply and method related thereto

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2819204A1 (de) * 1978-05-02 1979-11-08 Felten & Guilleaume Carlswerk Schaltungsanordnung fuer eine gleich- und/oder wechselstromsensitive mit verstaerker versehene fehlerstrom-schutzschaltung
DE4128679C1 (fr) * 1991-08-29 1992-08-27 Ant Nachrichtentechnik Gmbh, 7150 Backnang, De

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2819204A1 (de) * 1978-05-02 1979-11-08 Felten & Guilleaume Carlswerk Schaltungsanordnung fuer eine gleich- und/oder wechselstromsensitive mit verstaerker versehene fehlerstrom-schutzschaltung
DE4128679C1 (fr) * 1991-08-29 1992-08-27 Ant Nachrichtentechnik Gmbh, 7150 Backnang, De

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8587148B2 (en) 2008-04-22 2013-11-19 Belkin International, Inc. Electric power supply and related methods
US8890372B2 (en) 2010-01-05 2014-11-18 Belkin International, Inc. Power supply and method related thereto
US8742943B2 (en) 2010-02-04 2014-06-03 Belkin International, Inc. Ground detection circuit and method of manufacturing the same
WO2012024014A1 (fr) * 2010-06-08 2012-02-23 Belkin International, Inc. Limiteur de surtension et procédé destiné à le produire

Also Published As

Publication number Publication date
GB9623912D0 (en) 1997-01-08

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