Servo-amplifier for controlling a high-ohmic low-voltage source

G - Physics – 05 – F

Patent

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Details

G05F 1/46 (2006.01) H03K 17/082 (2006.01) H05B 41/392 (2006.01)

Patent

CA 2195442

A servo-amplifier for controlling a high-ohmic low-voltage source controllable between two boundary values of a pulse-width-modulated control signal, in which the input side has a galvanic separation and there is an operating voltage supply for the servo-amplifier. In an isolating transformer (1) for galvanic isolation, a circuit (with the components 4, 5, 6, 7) for finding the average of the pulse-width-modulated control signal for imaging the control signal is connected to a secondary winding (3) and the latter is also involved in a voltage multiplication circuit (17) to provide the operating voltage for the servo-amplifier. The servo-amplifier can in particular be protected against incorrect connection.

L'invention concerne un amplificateur de régulation pour moduler une source basse tension à haute impédance, modulable entre deux valeurs limites d'un signal de commande modulé par impulsions en largeur. Le côté entrée comporte une isolation électrique et il est prévu une alimentation en tension de fonctionnement pour l'amplificateur de réglage. Il est prévu, sur un transformateur de séparation (1) d'isolation électrique, qu'un circuit servant à former la moyenne (avec les composants 4, 5, 6, 7) à partir du signal de commande modulé par impulsions en largeur, afin de représenter le signal de commande, soit connecté à un enroulement secondaire (3) et que ce dernier (3) soit également intégré dans un circuit multiplicateur de tension (17) pour assurer la tension de fonctionnement de l'amplificateur de réglage. L'amplificateur de réglage peut notamment être protégé contre de mauvais raccordements.

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