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1. CA2042389 - CIRCUIT D'ATTAQUE POUR ELEMENT SENSIBLE BI-COURANT

Office
Canada
Numéro de la demande 2042389
Date de la demande 09.10.1990
Numéro de publication 2042389
Date de publication 27.06.1991
Type de publication A1
CIB
H01H 47/32
HÉLECTRICITÉ
01ÉLÉMENTS ÉLECTRIQUES FONDAMENTAUX
HINTERRUPTEURS ÉLECTRIQUES; RELAIS; SÉLECTEURS; DISPOSITIFS DE PROTECTION
47Circuits autres que ceux appropriés à une application particulière du relais et prévue pour obtenir une caractéristique de fonctionnement donnée ou pour assurer un courant d'excitation donné
22pour l'alimentation de la bobine du relais en courant d'excitation
32Courant d'excitation fourni par un dispositif semi-conducteur
CPC
H01H 47/325
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
47Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
22for supplying energising current for relay coil
32Energising current supplied by semiconductor device
325by switching regulator
Inventeurs HOFFMAN, JOHN PAUL
Données relatives à la priorité 07456918 26.12.1989 US
Titre
(EN) DUAL CURRENT SENSING DRIVER CIRCUIT
(FR) CIRCUIT D'ATTAQUE POUR ELEMENT SENSIBLE BI-COURANT
Abrégé
(EN) -22- Abstract of the Disclosure Dual Current Sensing Driver Circuit A driver circuit (10) for an inductive load (12), such as a solenoid winding (16), includes flyback and energization current sensors (28,40) which respectively sense the current through the coil during flyback and energization. The flyback current sensor (28) includes a flyback current resistor (30) disposed in the flyback current path of the winding (16) for producing a flyback signal proportional to the flyback current. The energization current sensor (40) includes an energization current resistor (42) disposed within the energization current path of the winding (16). The energization current resistor (42) is adapted to produce an energization signal in response to the energization current flowing through the winding (16). Control of the solenoid winding (16) is effected by a switch (24) which connects and disconnects the winding (16) from a power source (VB) in response to the duty factor of a control signal. A first summing amplifier (54) receives the flyback and energization signals and produces an actual current signal in response to the received signals. A second summing amplifier (60) receives the actual current signal and a desired current signal and produces an error signal in response to a difference between the actual and desired current signals. A first comparator (68) receives the error signal and produces the control signal responsive to the error signal, wherein the duty factor of the control signal is responsive to the magnitude of error signal. The duty factor of the control signal is constantly adjusted in this manner to maintain the solenoid current at the desired level.