Dimming interface for power line

Details Dimming interface for power line Dimming interface for power line

2009-03-25

2011-12-06

Tan, Vibol (Department: 2819)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Plural load device regulation

C315S291000, C315S20000A, C315S2090SC, C315S312000

Reexamination Certificate

active

08072158

ABSTRACT:
An interface circuit for a lamp ballast includes first and second input power lines, L1and L2, with first and second respective switches, and a neutral power line N, all coupled to a diode bridge. Closing one of the first or second input power lines L1or L2causes a photodiode in an opto-isolator coupled to the diode bridge to turn ON, which in turn causes a MOSFET in a control circuit to be in an open state. When in the open state, a first resistor coupled to the source of the MOSFET is included in the control circuit and causes a lamp attached thereto to operate in a dimmed state. When both input power line switches are closed, L1and L2are both coupled to the diode bridge and thereby cause the phototransistor to be in an OFF state, which causes the MOSFET to close, thereby including a second resistor, coupled to the drain of the MOSFET, in the control circuit in parallel with the first resistor. This in turn causes the lamp to operate at full intensity.

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