LED light with power switch controlled color temperature
First Claim
1. An LED light with power switch controlled color temperature, comprising:
- a line voltage source;
a line voltage switch having as an input said line voltage source and having as an output a switched line voltage, said line voltage switch configured in a first mode to transmit said line voltage source to said switched line voltage output and in a second mode to completely interrupt transmission of said line voltage from said line voltage source to said switched line voltage output;
at least two LED light sources;
an LED driver having as an input said switched line voltage and having as an output a regulated LED power supply suitable to drive said at least two LED light sources, said LED driver configured to convert said switched line voltage to said regulated LED power supply output;
a feedback circuit having as an input said regulated LED power supply and as an output a time averaged representation of said regulated LED power supply;
a monitor having as an input said time averaged representation of said regulated LED power supply and having as an output a mode signal indicating whether said line voltage switch is operating in said first mode or said second mode;
a logic circuit having as an input said mode signal and configured to detect when said mode signal indicates said line voltage switch is operating in said second mode for a time sufficient to be indicative of a demand to switch a Correlated Color Temperature light output from said at least two LED light sources and having as an output a Correlated Color Temperature control signal that changes in value responsive to a detection of said demand to switch said Correlated Color Temperature light output; and
a regulator circuit having as an input said Correlated Color Temperature control signal and configured to selectively control a Correlated Color Temperature of said at least two LED light sources responsive to said Correlated Color Temperature control signal.
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Accused Products
Abstract
A voltage monitor and LED color controller circuit detects wall light dimmer and wall light switch on/off status based upon the output of an LED driver located downstream from the wall light dimmer and switch. Various switch time delays will produce several different outputs from an LED array, enabling wall dimmer switch control of intensity and Correlated Color Temperature (CCT). In addition, a preferred embodiment will first turn on in a default mode with a spectrum that is substantially devoid of violet wavelengths and provides only nominal amounts of blue light, to avoid undesirable disruption of circadian rhythm. In other embodiments, various controls may be provided that permit custom light therapy for various purpose and benefit.
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Citations
22 Claims
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1. An LED light with power switch controlled color temperature, comprising:
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a line voltage source; a line voltage switch having as an input said line voltage source and having as an output a switched line voltage, said line voltage switch configured in a first mode to transmit said line voltage source to said switched line voltage output and in a second mode to completely interrupt transmission of said line voltage from said line voltage source to said switched line voltage output; at least two LED light sources; an LED driver having as an input said switched line voltage and having as an output a regulated LED power supply suitable to drive said at least two LED light sources, said LED driver configured to convert said switched line voltage to said regulated LED power supply output; a feedback circuit having as an input said regulated LED power supply and as an output a time averaged representation of said regulated LED power supply; a monitor having as an input said time averaged representation of said regulated LED power supply and having as an output a mode signal indicating whether said line voltage switch is operating in said first mode or said second mode; a logic circuit having as an input said mode signal and configured to detect when said mode signal indicates said line voltage switch is operating in said second mode for a time sufficient to be indicative of a demand to switch a Correlated Color Temperature light output from said at least two LED light sources and having as an output a Correlated Color Temperature control signal that changes in value responsive to a detection of said demand to switch said Correlated Color Temperature light output; and a regulator circuit having as an input said Correlated Color Temperature control signal and configured to selectively control a Correlated Color Temperature of said at least two LED light sources responsive to said Correlated Color Temperature control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An LED light with power switch controlled Correlated Color Temperature, comprising:
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a line voltage source; a line voltage switch having as an input said line voltage source and having as an output a switched line voltage, said line voltage switch configured in a first mode to transmit said line voltage source to said switched line voltage output and in a second mode to interrupt transmission of said line voltage from said line voltage source to said switched line voltage output; at least two LED light sources; an LED driver having as an input said switched line voltage and having as an output a regulated LED power supply providing at least one of a constant current output and a constant voltage output suitable to drive said at least two LED light sources, said LED driver configured to convert said switched line voltage to said regulated LED power supply output; a feedback circuit having a pair of resistors in series across said regulated LED power supply that together define a voltage divider, and having a capacitor in parallel with a first one of said resistors, wherein a voltage across said capacitor provides a time averaged representation of said regulated LED power supply; a microprocessor having as an input said time averaged representation of said regulated LED power supply and configured to detect when said time averaged representation indicates said line voltage switch is operating in said second mode by detecting a voltage amplitude of said time averaged representation of said regulated LED power supply crossing a threshold value, and further configured to detect when said line voltage switch is operating in said second mode for a time sufficient to be indicative of a demand to switch a Correlated Color Temperature light output from said at least two LED light sources, and having as an output a Correlated Color Temperature control signal that changes in value responsive to a detection of said demand to switch said Correlated Color Temperature light output; a DC regulator having as an input said LED driver output and having as an output a suitable voltage to power said microprocessor, said DC regulator further having stored energy sufficient to power said microprocessor for at least a time period that starts with a time of detection of said line voltage switch operating in said second mode and ends with a time of detection of said demand to switch said Correlated Color Temperature light output; and a regulator circuit having as an input said Correlated Color Temperature control signal and configured to selectively control a Correlated Color Temperature of said at least two LED light sources responsive to said Correlated Color Temperature control signal. - View Dependent Claims (12, 13)
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14. A method of switching the combination of an AC line powered LED driver and LED driver powered LED light between two different Correlated Color Temperature values, comprising the steps of:
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time averaging an LED driver output; comparing said time-averaged LED driver output to a threshold value below which said time-averaged LED driver output is indicative of a complete interruption of AC line power transmission to said AC line powered LED driver; detecting when said time-averaged LED driver output drops below said threshold value responsive to said comparing step; determining responsive to said detecting step whether said time-averaged LED driver output remains below said threshold value for a time sufficient to be indicative of a demand to switch a Correlated Color Temperature light output from said LED driver powered LED light; and selectively controlling said Correlated Color Temperature light output from said LED driver powered LED light responsive to said determining step. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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Specification