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1. (WO1992010878) CIRCUIT PROTECTION DEVICE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/010878 International Application No.: PCT/GB1991/002215
Publication Date: 25.06.1992 International Filing Date: 12.12.1991
Chapter 2 Demand Filed: 06.03.1992
IPC:
H02H 3/07 (2006.01) ,H02H 3/087 (2006.01)
H ELECTRICITY
02
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3
Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
02
Details
06
with automatic reconnection
07
and with permanent disconnection after a predetermined number of reconnection cycles
H ELECTRICITY
02
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3
Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
08
responsive to excess current
087
for dc applications
Applicants:
RAYCHEM LIMITED [GB/GB]; Rolls House 7 Rolls Buildings Fetter Lane London EC4 1NH, GB (AllExceptUS)
PRYOR, Dennis, Malcolm [GB/GB]; GB (UsOnly)
CHALLIS, Michael [GB/GB]; GB (UsOnly)
Inventors:
PRYOR, Dennis, Malcolm; GB
CHALLIS, Michael; GB
Agent:
DLUGOSZ, Anthony, Charles ; Raychem Limited Faraday Road Dorcan Swindon Wiltshire SN3 5HH, GB
Priority Data:
9027111.513.12.1990GB
Title (EN) CIRCUIT PROTECTION DEVICE
(FR) DISPOSITIF DE PROTECTION DE CIRCUITS
Abstract:
(EN) A circuit protection arrangement that is intended to be series connected in a line of an electrical circuit comprises a transistor switch (1) that controls the circuit current and has a control input, and a control arrangement that controls the voltage of the control input of the switch. The control arrangement comprises a comparator circuit (3) that compares a fraction of the voltage across the switch (1) with a reference voltage, for example supplied by a Zener diode or bandgap diode, and opens the switch if the fraction is greater than the reference voltage. The comparator circuit is powered by the voltage drop in the line across the switch so that the arrangement can be formed as a two-terminal device that requires no external power source. The arrangement has the advantage that it exhibits a relatively small variation in performance with respect to temperature variations.
(FR) L'invention se rapporte à un agencement de protection de circuits, qui est conçu pour être connecté en série à une ligne d'un circuit électrique et qui comprend un commutateur à transistor (1) commandant le courant du circuit et comportant une entrée de commande, ainsi qu'un agencement de commande qui commande la tension de l'entrée de commande du commutateur. L'agencement de commande comprend un circuit comparateur (3) qui compare une fraction de la tension traversant le commutateur (1) avec une tension de référence, fournie par exemple par une diode Zener ou une diode à largeur de bande interdite et qui ouvre le commutateur lorsque cette fraction est supérieure à la tension de référence. Le circuit comparateur est alimenté par la chute de tension se produisant dans la ligne à travers le commutateur, de sorte que l'agencement peut être produit sous la forme d'un dispositif à deux bornes ne nécessitant aucune source d'alimentation externe. Cet agencement a l'avantage de présenter des variations de performances relativement faibles en relation avec les variations de température.
Designated States: AU, BR, CA, JP, KR, NO, SU, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, MC, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
NO19932149EP0561900US5465188JP3080988JPH06503452CA2096641
KR1019930703738AU1991090556