Dimmer for preventing asymmetric current flow through an...

H - Electricity – 05 – B

Patent

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H05B 39/08 (2006.01)

Patent

CA 2644727

A two-wire dimmer is operable to control the amount of power delivered to a magnetic low-voltage (MLV) load and comprises a bidirectional semiconductor, a timing circuit, a trigger circuit having a variable voltage threshold, and a clamp circuit. When a timing voltage signal of the timing circuit exceeds an initial magnitude of the variable voltage threshold, the trigger circuit is operable to render the semiconductor switch conductive, reduce the timing voltage signal to a predetermined magnitude less than the initial magnitude, and to increase the variable voltage threshold to a second magnitude greater than the first magnitude. The clamp circuit limits the magnitude of the timing voltage signal to a clamp magnitude between the initial magnitude and the second magnitude, thereby preventing the timing voltage signal from exceeding the second magnitude. Accordingly, the MLV dimmer is prevented from conducting asymmetric current when an MLV transformer of the MLV load is unloaded.

La présente invention concerne un variateur à deux fils conçu pour commander la quantité de courant fournie à une charge magnétique basse tension (MLV). Ce variateur comprend un semi-conducteur bidirectionnel, un circuit de temporisation, un circuit déclencheur présentant un seuil de tension variable, ainsi qu'un circuit de calage. Lorsqu'un signal de tension de temporisation du circuit de temporisation dépasse une amplitude initiale du seuil de tension variable, le circuit déclencheur est conçu pour rendre conducteur le commutateur semi-conducteur, abaisser le signal de tension de temporisation à une amplitude prédéfinie qui est inférieure à l'amplitude initiale et augmenter le seuil de tension variable à une seconde amplitude qui est supérieure à la première amplitude. Le circuit de calage limite l'amplitude du signal de tension de temporisation à une amplitude de calage comprise entre l'amplitude initiale et la seconde amplitude, ce qui permet d'empêcher le signal de tension de temporisation de dépasser la seconde amplitude. Le variateur MLV ne peut ainsi pas conduire de courant asymétrique lorsqu'un transformateur MLV de la charge MLV n'est pas chargé.

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