US Pat. No. 10,172,208

METHOD FOR ADJUSTING COLOR TEMPERATURE OF LED IN SINGLE LIGHT FIXTURE

ZHONGSHAN LUXMODE INDUSTR...

1. A method for adjusting a color temperature of an LED in a single light fixture, comprising providing a light fixture which includes at least two light-emitting modules, wherein the light-emitting modules respectively have a loop and a color temperature, are respectively controlled by different switches, and have different color temperatures;the switch element is selectively turned on or off, and the brightness of the corresponding light-emitting modules can be controlled, so that light emitted by the light fixture at least has more than three different color temperatures;
a number of the light-emitting modules is two for a first light-emitting module and a second light-emitting module; and
the switch element includes a first switch, electrically connected to the first light-emitting module, a second switch, electrically connected to the second light-emitting module, a first MOS transistor, a second MOS transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein:
a drain of the first MOS transistor is electrically connected to the first light-emitting module;
a source of the first MOS transistor is electrically connected to one end of the third resistor;
one end of the first resistor is respectively electrically connected to the other end of the third resistor and a gate of the first MOS transistor;
the other end of the first resistor is electrically connected to the first switch;
a drain of the second MOS transistor is electrically connected to the second light-emitting module;
a source of the second MOS transistor is electrically connected to one end of the fourth resistor;
one end of the second resistor is respectively electrically connected to the other end of the fourth resistor and a gate of the second MOS transistor; and
the other end of the second resistor is electrically connected to the second switch.