Warm dimming LED-filaments and LED-filament lamps
AssigneeIntematix Corporation
InventorsYi-Qun Li, Jun-Gang Zhao, Gang Wang
Life of this patent
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Abstract
An embodiment of an LED lamp that generates light of a color temperature that decreases with decreasing power applied to the LED lamp may include at least one lighting arrangement that may include a first LED array of serially connected first LED chips, a second LED array of serially connected second LED chips; a first photoluminescence layer covering the first LED array for generating light of a first color temperature; a second photoluminescence layer covering the second LED array for generating light of a second different color temperature; and a linear resistor serially connected to the first LED array, wherein the first LED array and second LED array are connected in parallel.
Claims12
An LED lamp for generating light of a color temperature that decreases with decreasing power applied to the LED lamp, the LED lamp comprising:
- a first LED string of serially connected first LED chips,
- a second LED string of serially connected second LED chips,
- a first photoluminescence arrangement for covering the first LED string for generating light of a first color temperature,
- a second photoluminescence arrangement for covering the second LED string for generating light of a second different color temperature, and
- a linear resistor serially connected with the first LED string;
- wherein the first LED string and second LED string are connected in parallel;
- and
- wherein a current/voltage characteristic (I-V) of the first LED string increases substantially linearly with increasing voltage and a current/voltage characteristic (I-V) of the second LED string increases generally exponentially with increasing voltage.
Dependencies are inferred from the claim text.