US 11,893,868 B2
Multi-level LED security light with motion sensor
Chia-Teh Chen, Taipei (TW)
Assigned to Vaxcel International Co., Ltd., Carol Stream, IL (US)
Filed by VAXCEL INTERNATIONAL CO., LTD., Carol Stream, IL (US)
Filed on Oct. 24, 2022, as Appl. No. 17/972,189.
Application 17/972,189 is a continuation of application No. 17/511,320, filed on Oct. 26, 2021, granted, now 11,657,691.
Application 17/511,320 is a continuation of application No. 17/202,879, filed on Mar. 16, 2021, granted, now 11,183,039, issued on Nov. 23, 2021.
Application 17/202,879 is a continuation of application No. 16/159,852, filed on Oct. 15, 2018, granted, now 10,985,596, issued on Apr. 20, 2021.
Application 16/159,852 is a continuation of application No. 15/393,768, filed on Dec. 29, 2016, granted, now 10,136,495, issued on Nov. 20, 2018.
Application 15/393,768 is a continuation of application No. 15/213,595, filed on Jul. 19, 2016, granted, now 9,622,328, issued on Apr. 11, 2017.
Application 15/213,595 is a continuation of application No. 14/478,150, filed on Sep. 5, 2014, granted, now 9,445,474, issued on Sep. 13, 2016.
Application 14/478,150 is a continuation of application No. 13/222,090, filed on Aug. 31, 2011, granted, now 8,866,392, issued on Oct. 21, 2014.
Prior Publication US 2023/0334970 A1, Oct. 19, 2023
Int. Cl. H05B 45/30 (2020.01); H05B 47/10 (2020.01); G08B 15/00 (2006.01); H05B 45/14 (2020.01); H05B 45/20 (2020.01); H05B 45/44 (2020.01); H05B 45/46 (2020.01); H05B 45/48 (2020.01); H05B 47/11 (2020.01); H05B 47/16 (2020.01); H05B 47/115 (2020.01); H05B 47/17 (2020.01); H05B 45/12 (2020.01); H05B 45/37 (2020.01); H05B 45/10 (2020.01); H05B 47/105 (2020.01); H05B 39/04 (2006.01); F21S 9/03 (2006.01); F21V 17/02 (2006.01); G08B 5/36 (2006.01); G08B 13/189 (2006.01); H02J 7/35 (2006.01); F21Y 115/10 (2016.01); G08B 13/00 (2006.01)
CPC G08B 15/00 (2013.01) [F21S 9/03 (2013.01); F21V 17/02 (2013.01); G08B 5/36 (2013.01); G08B 13/1895 (2013.01); G08B 15/002 (2013.01); H02J 7/35 (2013.01); H05B 39/042 (2013.01); H05B 39/044 (2013.01); H05B 45/10 (2020.01); H05B 45/12 (2020.01); H05B 45/14 (2020.01); H05B 45/20 (2020.01); H05B 45/37 (2020.01); H05B 45/44 (2020.01); H05B 45/46 (2020.01); H05B 45/48 (2020.01); H05B 47/10 (2020.01); H05B 47/105 (2020.01); H05B 47/11 (2020.01); H05B 47/115 (2020.01); H05B 47/16 (2020.01); H05B 47/17 (2020.01); F21Y 2115/10 (2016.08); G08B 13/00 (2013.01); G08B 13/189 (2013.01); Y02B 20/40 (2013.01)] 111 Claims
OG exemplary drawing
 
1. An LED security light comprising:
a light-emitting unit comprising a plurality of LEDs divided into two LED loads including a first LED load with N number LEDs emitting light with a first color temperature and a second LED load with M number 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 loading and power control unit;
a light sensing control unit;
a power supply unit; and
an external control unit including at least one external control device outputting at least one external control signal for tuning and setting the diffused light color temperature;
wherein the loading and power control unit includes at least a controller and an LED driver circuitry, wherein the LED driver circuitry is electrically connected with a power source of the power supply unit and the light-emitting unit for outputting a DC power with a constant current delivered to the light-emitting unit; wherein the LED driver circuitry is further configured with a first LED driver comprising a first semiconductor switching device electrically coupled to the first LED load and a second LED driver comprising a second semiconductor switching device electrically coupled to the second LED load;
wherein the controller is electrically coupled with the first LED driver, the second LED driver, the light sensing control unit, and the at least one external control device;
wherein when the light-emitting unit is in a turned-on state, the controller further outputs a first control signal to control a first conduction rate of the first semiconductor switching device of the first LED driver and a second control signal to control a second conduction rate of the second semiconductor switching device of the second LED driver to respectively deliver a first electric power to the first LED load and a second electric power to the second LED load to generate the diffused light with the diffused light color temperature thru the light diffuser according to the at least one external control signal;
wherein for tuning the diffused light color temperature, the controller operates a power allocation algorithm to reversely and complementarily adjust the first electric power and the second electric power respectively delivered to the first LED load and the second LED load such that a sum of the first electric power and the second electric power remains unchanged;
wherein for tuning the diffused light color temperature to a lower diffused light color temperature, the controller operates according to the power allocation algorithm to increase the first conduction rate of the first semiconductor switching device to increase the first electric power delivered to the first LED load and simultaneously operates to decrease the second conduction rate of the second semiconductor switching device to decrease the second electric power delivered to the second LED load with the same pace such that a total light intensity generated by the light-emitting unit remains unchanged while the diffused light color temperature is accordingly adjusted to the lower diffused light color temperature;
wherein for tuning the diffused light color temperature to a higher diffused light color temperature, the controller operates according to the power allocation algorithm to decrease the first conduction rate of the first semiconductor switching device to decrease the first electric power delivered to the first LED load and simultaneously operates to increase the second conduction rate of the second semiconductor switching device to increase the second electric power delivered to the second LED load with the same pace such that the total light intensity generated by the light-emitting unit remains unchanged while the diffused light color temperature is accordingly adjusted to the higher diffused light color temperature;
wherein when a light intensity level of an ambient light detected by the light sensing control unit is lower than a first predetermined value, the loading and power control unit operates to deliver an average electric power to the light-emitting unit to turn on the light-emitting unit to perform an illumination characterized by the diffused light with the diffused light color temperature;
wherein when the light intensity level of the ambient light detected by the light sensing control unit is higher than a second predetermined value, the loading and power control unit manages to turn off all the LEDs in the light-emitting unit; 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, a constant 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.