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1. (WO1991006968) FLYBACK CURRENT DAMPENING APPARATUS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/006968 International Application No.: PCT/US1990/000373
Publication Date: 16.05.1991 International Filing Date: 20.01.1990
IPC:
H01H 47/32 (2006.01) ,H02H 9/04 (2006.01)
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
H
ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
47
Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
22
for supplying energising current for relay coil
32
Energising current supplied by semiconductor device
H ELECTRICITY
02
GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
9
Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
04
responsive to excess voltage
Applicants:
CATERPILLAR INDUSTRIAL INC. [US/US]; 5960 Heisley Road Mentor, OH 44060, US
Inventors:
WIBLIN, Wayne, T.; US
WILD, Arthur (NMI); US
Agent:
HICKMAN, Alan, J. ; Caterpillar Industrial Inc. 100 Northeast Adams Street Peoria, IL 61629-6490, US
Priority Data:
431,81006.11.1989US
Title (EN) FLYBACK CURRENT DAMPENING APPARATUS
(FR) SYSTEME POUR AFFAIBLIR LE COURANT DE RETOUR
Abstract:
(EN) An apparatus (16) for dampening current in a coil (22) is provided. A switchable member (28) having 'ON' and 'OFF' states controls the current level in the coil (22) and a flyback circuit (48) allows current in the coil (22) to slowly dissipate when the switchable member (28) changes from the 'ON' to the 'OFF' state thereby preventing damaging voltage spikes. The flyback circuit (48) has a high resistance when the switchable member (28) changes from the 'ON' to the 'OFF' state so that the coil (22) current is dampened as quickly as possible without creating a destructive voltage and low resistance when the switchable member (28) is in the 'ON' state to conserve energy. A signalling device (60) creates a voltage signal as a function of current passing through the flyback circuit (48) and a receiving device (44) varies the resistance of the flyback circuit (48) in response to the voltage signal. The apparatus (16) is particularly suited for use in a motor control circuit (10).
(FR) Système (16) pour affaiblir le courant dans une bobine (22). Un commutateur (28) doté des deux positions 'MARCHE' et 'ARRET' commande le niveau du courant dans la bobine (22) et un circuit de retour (48) permet au courant se trouvant dans la bobine (22) de se dissiper lentement lorsque le commutateur (28) passe de la position 'MARCHE' à la position 'ARRET' ce qui évite alors les pointes de tension qui peuvent créer des dommages. Losque le commutateur (28) passe de la posistion 'MARCHE' à la position 'ARRET', le circuit de retour (48) possède une forte résistance qui permet d'affaiblir le courant de la bobine (22) aussi rapidement que possible sans créer une tension destructrice; une résistance faible sert à conserver l'énergie lorsque le commutateur (28) est en position 'MARCHE'. Un dispositif de signalisation (60) crée un signal de tension sous forme d'une fonction de courant traversant le circuit de retour (48) et un dispositif de réception (44) fait varier la résistance du circuit de retour (48) en réponse au signal de tension. Le système (16) est plus particulièrement adapté pour être utilisé dans un circuit de commande du moteur (10).
Designated States: CA, ES, JP, KR
European Patent Office (DE, ES, FR, GB, IT)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0452417KR1019920702005