Method and Apparatus for Controlling Power in a LED Lighting System
First Claim
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1. A modular lighting system, comprising:
- a voltage source; and
a plurality of lighting modules, each lighting module comprising;
at least one light source;
a power supply electrically connected to the voltage source and configured to regulate a current output from the power supply;
a processor configured to receive a reference signal and output a control signal corresponding to the reference signal; and
at least one switch selectively establishing an electrical connection between the power supply and the light source according to the control signal, wherein the electrical connections for the lighting modules are established at different times.
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Abstract
The LED light fixture includes white LEDs having multiple, different color temperatures. Preferably, white LEDs having color temperatures of about 3500 and about 5000 degrees Kelvin (K) are selected. The intensity of each LED may be varied and the light radiated from the LEDs is mixed together. The resulting light emitted from the housing is a white light having a variable color temperature ranging from about 3500 to about 5000 K. The housing is preferably extruded aluminum. A portion of the housing is configured to mix the light together and to focus the light such that the output light is about thirty degrees off center. Electrical loading is off set to minimize load on power supplies.
109 Citations
18 Claims
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1. A modular lighting system, comprising:
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a voltage source; and a plurality of lighting modules, each lighting module comprising; at least one light source; a power supply electrically connected to the voltage source and configured to regulate a current output from the power supply; a processor configured to receive a reference signal and output a control signal corresponding to the reference signal; and at least one switch selectively establishing an electrical connection between the power supply and the light source according to the control signal, wherein the electrical connections for the lighting modules are established at different times. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A modular lighting system, comprising
a voltage source; - and
a plurality of lighting modules, each lighting module comprising; a LED light source; a power supply electrically connected to the voltage source and configured to regulate a current output from the power supply to the LED light source; a switch connected in series between the power supply and the LED light source to establish an electrical connection between the power supply and the LED light source in a first operating mode and to break the electrical connection between the power supply and the LED light source in a second operating mode; a processor configured to execute a pulse width modulation algorithm having a switching period, the processor having a control output to select either the first or the second operating mode of the switch, an input configured to receive a synchronizing signal from one of the other lighting modules, and an output configured to transmit a corresponding synchronizing signal to one of the other lighting modules; and a memory device in communication with the processor storing a delay time, wherein the processors of each of the lighting modules are synchronized to select either the first or the second operating mode of their respective switch at a different time. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of controlling power supplied to a light system having a plurality of light modules, comprising the steps of:
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receiving a reference signal corresponding to a desired intensity of light; determining an on time for connecting a light source to a power supply on each light module as a function of the desired intensity and a switching period; energizing each light source for the on time, wherein the on time is a portion of the switching period; and staggering the start of the on time by a delay time for each successive light source. - View Dependent Claims (15, 16, 17, 18)
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Specification