Patent ID: 11893868
Assignee: VAXCEL INTERNATIONAL CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  F  H  Y | IPC F  G  H

Claim 75:
76. An LED lighting device comprising:
a light-emitting unit comprising a plurality of LEDs divided into two LED loads including a first LED load with N number of LEDs emitting light with a first color temperature and a second LED load with M number of LEDs emitting light with a second color temperature, wherein the first color temperature is designed with a value in a range between 1800K and 3000K and the second color temperature is designed with a value in a range between 4000K and 6500K, wherein M and N are positive integers with a value of M being greater than or equal to a value of N;
a light diffuser covering the first LED load and the second LED load to create a diffused light with a diffused light color temperature;
a power allocation circuitry electrically connected with a power source from a power supply unit and the light-emitting unit to operate a plurality of different power loading options between delivering a first electric power to the first LED load and delivering a second electric power to the second LED load to perform an illumination characterized by the diffused light with the diffused light color temperature; and
at least one external control device to output at least one external control signal for tuning and selecting a corresponding diffused light color temperature performance;
wherein the power allocation circuitry is designed to operate the plurality of different power loading options according to a power allocation algorithm for distributing and loading a DC power between the first electric power delivered to the first LED load and the second electric power delivered to the second LED load, wherein each of the plurality of different power loading options is configured with a paired combination of the first electric power and the second electric power for generating the diffused light with the diffused light color temperature to form a diffused light color temperature switching scheme comprising a plurality of different diffused light color temperature performances for selection, wherein for generating and executing each of the plurality of different power loading options, the first electric power and the second electric power in each paired combination are to be reversely and complementarily adjusted according to the power allocation algorithm such that a sum of the first electric power and the second electric power respectively delivered to the first LED load and the second LED load is maintained at a constant level to characterize a technical foundation of the color temperature switching scheme; and
wherein the N number LEDs of the first LED load and the M number LEDs of the second LED load are respectively designed with a configuration of in series and/or in parallel connections such that when incorporated with a power level setting of the DC power, an electric current passing through each LED of the first LED load and each LED of the second LED load remains at a level such that a voltage V across each LED complies with an operating constraint of Vth<V<Vmax featuring electrical characteristics of an LED, wherein Vth is a reference value of a threshold voltage required to trigger each LED to start emitting light and Vmax is a reference value of a maximum operating voltage across each LED at which at least one LED construction in said plurality of LEDs is vulnerable to a thermal damage.