Communication circuit for a digital electronic dimming ballast

H - Electricity – 05 – B

Patent

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Details

H05B 37/02 (2006.01) H04L 25/02 (2006.01)

Patent

CA 2684512

A communication circuit for an electronic dimming ballast provides high-voltage miswire protection and improved rise and fall times of a transmitted digital signal. The electronic dimming ballast comprises a control circuit, which is coupled to a digital communication link, for example, a DALI communication link, via the communication circuit. The communication circuit comprises a receiving circuit for detecting when the digital ballast communication link is shorted and for providing a received digital message to the control circuit. The communication circuit also comprises a transmitting circuit for shorting the communication link in response to the control circuit. The communication circuit also includes a high-voltage fault protection circuit for protecting the circuitry of the communication circuit if the communication circuit high- voltage mains voltages. The communication circuit is operable to reliably transmit digital messages having improved rise and fall times. The communication circuit draws acceptable amounts of current when the communication link is alternatively in idle and active states.

La présente invention concerne un circuit de communication pour un ballast de gradation électronique fournissant une protection contre les défauts haute tension et des temps de montée et de retombée améliorés d'un signal numérique transmis. Le ballast de gradation électronique comprend un circuit de commande, qui est couplé à une liaison de communication numérique, par exemple, une liaison de communication DALI, via le circuit de communication. Le circuit de communication comprend un circuit de réception pour détecter lorsque la liaison de communication ballast est raccourcie et pour fournir un message numérique reçu au circuit de commande. Le circuit de communication comprend également un circuit de transmission pour raccourcir la liaison de communication en réponse au circuit de commande. Le circuit de communication comprend également un circuit de protection contre les défauts haute tension pour protéger la circuiterie du circuit de communication en cas de haute tension du circuit de communication. Le circuit de communication fonctionne pour transmettre de façon fiable les messages numériques dotés de temps de montée et de retombée améliorés. Le circuit de communication prélève des quantités acceptables de courant lorsque la liaison de communication est alternativement dans des états passifs et actifs.

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