Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Reexamination Certificate
2011-07-19
2011-07-19
Fureman, Jared J (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
Reexamination Certificate
active
07983012
ABSTRACT:
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.
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Chitta Venkatesh
Dvorkin Elik
Veskovic Dragan
Fureman Jared J
Hoang Ann T
Lutron Electronics Co. Inc.
Rose Mark E.
Smith Philip N.
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