TWO-LEVEL LED SECURITY LIGHT WITH MOTION SENSOR

摘要

A two-level LED security light with a motion sensor. At night, the LED is turned on for a low level illumination. When the motion sensor detects any intrusion, the LED is switched from the low level illumination to a high level illumination for a short duration time. After the short duration time, the LED security light returns to the low level illumination for saving energy. The LED security light includes a power supply unit, a light sensing control unit, a motion sensing unit, a loading and power control unit, and a lighting-emitting unit. The lighting-emitting unit includes one or a plurality of LEDs which may be turned-on or turned-off according to the sensing results from the light sensing control unit. When the motion sensing unit detects an intrusion, the illumination of the LED security light can be immediately turned on to the high level to scare away the intruder.

主权项

1. A LED security light, comprising:
a light-emitting unit, comprising a LED lamp; a loading and power control unit; a light sensing control unit; a motion sensing unit; and a power supply unit; wherein the light-emitting unit is angle adjustable to provide illumination projection toward desired living spaces for performing security protection; wherein the loading and power control unit comprises a microcontroller electrically coupled with a switching circuitry, wherein the switching circuitry is electrically connected with a power source and the LED lamp of the light-emitting unit, wherein the microcontroller outputs a control signal to control a conduction period and a cut-off period of the switching circuitry for delivering different average electric powers from the power source to drive the light-emitting unit for generating different illuminations, wherein the microcontroller controls the switching circuitry respectively to have at least a short conduction period and at least a long conduction period such that the light-emitting unit respectively generates at least a low level illumination and at least a high level illumination according to signal received from the light sensing control unit or the motion sensing unit.