Two-level LED security light with motion sensor

A lifestyle LED security light comprising:

• a light-emitting unit, configured with at least a first LED load for emitting light with a low color temperature and at least a second LED load for emitting light with a high color temperature;
• a diffuser covering the first LED load and the second LED load to create a diffused light with a mingled light color temperature;
• a loading and power control unit;
• a light sensing control unit;
• a motion sensing unit;
• a power supply unit;
• and
• an external control unit including at least a first external control device outputting at least one first external control signal;
• wherein the loading and power control unit comprises at least a first controller and a switching circuitry, wherein the first controller is electrically and respectively coupled with the light sensing control unit, the motion sensing unit, the switching circuitry and the first external control device;
• wherein the switching circuitry is electrically coupled between a power source of the power supply unit and the light-emitting unit, wherein the power source is a DC power source configured in the power supply unit to output at least one DC power;
• wherein the switching circuitry comprises at least a first controllable switching device and at least a second controllable switching device;
• wherein the first LED load and the second LED load are connected in parallel and are further respectively and electrically coupled to the first controllable switching device and the second controllable switching device;
• wherein the first controller outputs a first control signal to control a first conduction rate of the first controllable switching device for delivering a first electric power to the first LED load and simultaneously a second control signal to control a second conduction rate of the second controllable switching device for delivering a second electric power to the second LED load such that the light-emitting unit respectively generates illuminations of different light intensities and different mingled light color temperatures for performing different illumination modes according to signals respectively received from the light sensing control unit, the motion sensing unit and the first external control device;
• wherein when an ambient light detected by the light sensing control unit is lower than a first predetermined value, the loading and power control unit manages to deliver an electric power to the light-emitting unit to perform a first illumination mode with a first level illumination characterized by a first light intensity and a first mingled light color temperature for a first predetermined time duration with the motion sensing unit being temporarily deactivated;
• wherein upon a maturity of the first predetermined time duration the loading and power control unit manages to cutoff the electric power delivered to the light-emitting unit and at the same time the motion sensing unit is activated;
• wherein when a motion signal is detected by the motion sensing unit, the loading and power control unit manages to deliver the electric power to the light-emitting unit to perform a second illumination mode with a second level illumination characterized by a second light intensity and a second mingled light color temperature for a second predetermined time duration before being switched back to a turned off state;
• wherein the second light intensity of the second level illumination is equal to or higher than the first light intensity of the first level illumination;
• wherein when 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 switch off the light-emitting unit;
• wherein the first external control device generates the at least one first external control signal for tuning and setting the first mingled light color temperature of the first illumination mode or for tuning and setting the second mingled light color temperature of the second illumination mode;
• wherein the LEDs of the first LED load and the 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 an adequate level setting of the DC power source of the power supply unit an electric current passing through each LED of the first LED load and each LED of the second LED load remains at an adequate level such that a voltage V across each LED chip complies with an operating constraint of Vth<V<Vmax featuring electrical characteristics of the LED chip, wherein Vth is a threshold voltage required to trigger the LED to start emitting light and Vmax is a maximum operating voltage across the LED to avoid a thermal damage or burning out of LED construction.

A lifestyle LED security light comprising:

• a light-emitting unit, configured with at least a first LED load for emitting light with a low color temperature and at least a second LED load for emitting light with a high color temperature;
• a diffuser covering the first LED load and the second LED load to create a diffused light with a mingled light color temperature;
• a loading and power control unit;
• a light sensing control unit;
• a motion sensing unit;
• a power supply unit;
• and
• an external control unit including at least a first external control device outputting at least one first external control signal;
• wherein the loading and power control unit comprises at least a first controller and a switching circuitry, wherein the first controller is electrically and respectively coupled with the light sensing control unit, the motion sensing unit, the switching circuitry and the first external control device;
• wherein the switching circuitry is electrically coupled between at least one power source of the power supply unit and the light-emitting unit, wherein the at least one power source is a DC power source configured in the power supply unit to output at least one DC power;
• wherein the switching circuitry comprises at least a first controllable switching device and a second controllable switching device;
• wherein the first LED load and the second LED load are connected in parallel and are further respectively and electrically coupled to the first controllable switching device and the second controllable switching device;
• wherein the first controller outputs a first control signal to control a first conduction rate of the first controllable switching device for delivering a first electric power to the first LED load and simultaneously the first controller also outputs a second control signal to control a second conduction rate of the second controllable switching device for delivering a second electric power to the second LED load such that the light-emitting unit respectively generates illuminations of different light intensities and different mingled light color temperatures for performing different illumination modes according to signals respectively received from the light sensing control unit, the motion sensing unit and the first external control device;
• wherein when an ambient light detected by the light sensing control unit is lower than a first predetermined value, the loading and power control unit manages to deliver an electric power to the light-emitting unit to perform a first illumination mode with a first level illumination characterized by a first light intensity and a first mingled light color temperature for a first predetermined time duration with the motion sensing unit being temporarily deactivated;
• wherein upon a maturity of the first predetermined time duration the loading and power control unit manages to reduce the electric power delivered to the light-emitting unit to generate a low level illumination characterized by a low light intensity and at the same time the motion sensing unit is activated;
• wherein when a motion signal is detected by the motion sensing unit, the loading and power control unit manages to increase the electric power delivered to light-emitting unit to perform a second illumination mode with a second level illumination characterized by a second light intensity and a second mingled light color temperature for a second predetermined time duration before being switched back to the low level illumination, wherein the second light intensity of the second level illumination is equal to or higher than the first light intensity of the first level illumination, wherein the first light intensity of the first level illumination is equal to or higher than the low light intensity of the low level illumination;
• wherein when 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 switch off the light-emitting unit;
• wherein the first external control device generates the at least one first external control signal for tuning the first mingled light color temperature of the first illumination mode or for tuning the second mingled light color temperature of the second illumination mode;
• wherein the LEDs of the first LED load and the 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 an adequate level setting of the DC power source of the power supply unit an electric current passing through each LED of the first LED load and each LED of the second LED load remains at an adequate level such that a voltage V across each LED complies with an operating constraint of Vth<V<Vmax featuring electrical characteristics of a LED, wherein Vth is a threshold voltage required to trigger the LED to start emitting light and Vmax is a maximum operating voltage across the LED to avoid a thermal damage or burning out of LED construction.

A two-level LED security light comprising:

• a light-emitting unit configured with an LED load;
• a loading and power control unit;
• a light sensing control unit;
• a motion sensing unit;
• a power supply unit;
• and
• an external control unit including at least a first external control device outputting at least one first external control signal;
• wherein the LED load of the light-emitting unit includes a plurality of LEDs divided into two sets with a first set of N number LEDs and a second set of M number LEDs electrically connected in parallel, wherein N and M are positive integers, wherein the N number LEDs emits light with a low color temperature and the M number LEDs emits light with a high color temperature, wherein the first set of N number LEDs and the second set of M number LEDs are covered by a diffuser to create a diffused light with a mingled light color temperature;
• wherein the loading and power control unit includes at least a first controller and a switching circuitry, wherein the switching circuitry is electrically coupled between a DC power source configured in the power supply unit and the light-emitting unit, wherein the switching circuitry comprises a first controllable switching device electrically coupled between the DC power source and the first set of N number LEDs and a second controllable switching device electrically coupled between the DC power source and the second set of M number LEDs;
• wherein the first controller is electrically coupled with the light sensing control unit, the motion sensing unit, the first controllable switching device, the second controllable switching device and at least the first external control device;
• wherein the first controller outputs a first control signal to control a first conduction rate of the first controllable switching device for delivering a first electric power to the first set of N number LEDs and simultaneously the first controller also outputs a second control signal to control a second conduction rate of the second controllable switching device for delivering a second electric power to the second set of M number LEDs such that the light-emitting unit respectively generates illuminations of different light intensities and different mingled light color temperatures for performing different illuminations according to signals respectively received from the light sensing control unit, the motion sensing unit and at least the first external control device;
• wherein when an ambient light detected by the light sensing control unit is lower than a predetermined value, the loading and power control unit manages to deliver a low level electric power to the light-emitting unit to generate a low level illumination characterized by a low light intensity and a first mingled light color temperature;
• wherein when the ambient light detected by the light sensing control unit is higher than the predetermined value, the loading and power control unit manages to switch off the light-emitting unit;
• wherein when a motion intrusion is detected by the motion sensing unit, the loading and power control unit manages to deliver a high level electric power to the light-emitting unit to generate a high level illumination characterized by a high light intensity and a second mingled light color temperature for a predetermined time duration before switching back to perform the low level illumination with the first mingled light color temperature;
• wherein the first external control device generates the at least one first external control signal for tuning the first mingled light color temperature of the low level illumination or for tuning the second mingled light color temperature of the high level illumination;
• wherein the plurality of LEDs of the first set of N number LEDs and the second set of M number LEDs in conjunction with a power level setting of the DC power source of the power supply unit are respectively designed with a configuration of in series and/or in parallel connections of LEDs such that an electric current passing through each LED of the light-emitting unit remains at an adequate level, and 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 threshold voltage required to trigger each LED to start emitting light and Vmax is a maximum operating voltage across each LED to avoid a thermal damage or burning out of LED construction.

An LED lighting device configured with a running mingled light color temperature switching process of a color temperature switching scheme, comprising:

• a light-emitting unit configured with at least a first LED load for emitting light with a low color temperature and at least a second LED load for emitting light with a high color temperature;
• a diffuser covering the first LED load and the second LED load to create a diffused light with a mingled light color temperature;
• a mingled light color temperature tuning algorithm to generate the color temperature switching scheme comprising a plurality of different mingled light color temperature performances and to operate a running pick and play process of the plurality of different mingled light color temperature performances in the color temperature switching scheme by turns according to a prearranged sequence;
• a loading and power control unit to execute each of the plurality of different mingled light color temperature performances by turns according to the prearranged sequence to implement the running mingled light color temperature switching process;
• a power supply unit;
• and
• at least a first external control device to output at least one first external control signal to activate the running mingled light color temperature switching process;
• wherein the loading and power control unit comprises at least a first controller
• and a switching circuitry, wherein the switching circuitry is composed of a first controllable switching device and a second controllable switching device,
• wherein the first controller is electrically and respectively coupled with the first controllable switching device, the second controllable switching device, and the first external control device;
• wherein the switching circuitry is electrically coupled between a power source of the power supply unit and the light-emitting unit, wherein the power source is a DC power source configured in the power supply unit to output at least one DC power;
• wherein the first LED load and the second LED load are connected in parallel and are respectively and electrically coupled to the first controllable switching device and the second controllable switching device of the switching circuitry;
• wherein the first controller outputs a first control signal to control a first conduction rate of the first controllable switching device and a second control signal to control a second conduction rate of the second controllable switching device to respectively deliver a first electric power to the first LED load and a second electric power to the second LED load to perform an illumination with a light intensity and a mingled light color temperature performance according to the at least one first external control signal received from at least the first external control device;
• wherein the first controller is designed with the color temperature switching scheme comprising the plurality of different mingled light color temperature performances selectable for performing the mingled light color temperature of the light-emitting unit;
• wherein each of the plurality of different diffused light color temperature performances is designed according to the mingled light color temperature tuning algorithm that the first conduction rate of the first controllable switching device and the second conduction rate of the second controllable switching device are reversely and complementarily adjusted such that a sum of the first electric power delivered to the first LED load and the second electric power delivered to the second LED load remains unchanged while the mingled light color temperature is changed to a lower color temperature performance or a higher color temperature performance;
• wherein upon receiving the at least one first external control signal from the first external control device, the first controller operates a running pick and play process to continuously and recurrently perform each of the plurality of different mingled light color temperature performances by turns according to the prearranged sequence to implement the running mingled light color temperature switching process, the running mingled light color temperature switching process ceases at a time when the at least one first external control signal is terminated or a second external control signal is received by the first controller.