Patent ID: 9648702
Date: 2017-05-09
CPC Classifications: F21S,F21V,F21Y,G08B,H02J,H05B,Y02B

Claim:
1. A two-level LED security light, comprising: a light-emitting unit; a loading and power control unit, comprising a microcontroller electrically coupled with a semiconductor switching device; a motion sensing unit, coupled to the microcontroller; a time setting unit, coupled to the microcontroller; and a power supply unit; wherein the light-emitting unit comprises at least one LED; wherein the semiconductor switching device is electrically connected in series with the power supply unit and the light-emitting unit, wherein the microcontroller with program codes outputs a pulse width modulation (PWM) signal to control the conduction period T wherein the short T wherein when the power supply unit begins to power the two-level LED security light, the microcontroller manages to output a pulse width modulation signal with a short T wherein when an intrusion is detected by the motion sensing unit, the high level illumination is triggered by a sensing signal generated from the motion sensing unit, and the microcontroller manages to change from the short T wherein the low level illumination and the high level illumination are alternately switched between deactivation and activation by the motion sensing unit according to the second predetermined duration set by the time setting unit.