Intelligent light fixture facilitating universal light bulb
View Patent ↗An intelligent light fixture facilitates the use of a ‘universal’ light bulb having a wattage rating. A lamp dimmer circuit disposed within the fixture is in electrical communication between the AC line and a socket. A bulb test circuit within the fixture is operative to determine the maximum wattage of the bulb. A controller, also within the fixture includes a wattage select input. The controller is operative to determine the maximum wattage of the bulb using the bulb test circuit, compare the maximum wattage to the wattage select input and, if the maximum wattage is greater than the wattage select input, control the dimmer circuit to ensure that the power delivered to the bulb does not exceed the wattage select input. The bulb test circuit may determine the maximum wattage of the bulb by measuring the resistance of the bulb's filament or alternatively, by temporarily impressing line voltage across the bulb and measuring the current drawn by the bulb's filament. Alternative embodiments provide a wattage dial disposed on an adapter unit or directly on the threaded base of a bulb.
1. An intelligent light fixture for use with a light bulb having a wattage rating, the fixture comprising:
an input to receive AC line voltage;
a socket into which a bulb is inserted;
a lamp dimmer circuit in electrical communication between the AC line and the socket;
a bulb test circuit in electrical communication with the socket, the bulb test circuit being operative to determine the maximum wattage of the bulb; and
a controller operated off of the AC line, the controller having a wattage select input, and wherein the controller is operative to perform the following functions:
a) determine the maximum wattage of the bulb using the bulb test circuit,
b) compare the maximum wattage to the wattage select input and, if the maximum wattage is greater than the wattage select input,
c) control the dimmer circuit to ensure that the power delivered to the bulb does not exceed the wattage select input.
2. The intelligent light fixture of claim 1 , wherein the bulb test circuit determines the maximum wattage of the bulb by measuring the resistance of the bulb's filament.
3. The intelligent light fixture of claim 1 , wherein the bulb test circuit determines the maximum wattage of the bulb by temporarily impressing line voltage across the bulb and measuring the current drawn by the bulb's filament.
4. The intelligent light fixture of claim 1 , further including an alarm to inform a user that a bulb has not been inserted in the socket or that the socket contains a burned-out bulb.