Two-level LED security light with motion sensor

• US 9,622,328 B2
• Filed: 07/19/2016
• Issued: 04/11/2017
• Est. Priority Date: 08/31/2011
• Status: Active Grant

• Current Assignee: Vaxcel International Company Limited
• Original Assignee: Chia-Teh Chen
• Inventors: Chen, Chia-Teh
• Primary Examiner(s): Le, Tung X
• Application Number:
  US15/213,595
• Publication Number:
  US 20160330818A1
• Time in Patent Office: 266 Days
• Field of Search: 315149, 315152, 315154, 315307, 315308, 315312
• CPC Class Codes: F21S 9/03 rechargeable by exposure to light
• CPC Class Codes: F21V 17/02 with provision for adjustment F21V17/04 - F21V17/08 take precedence
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G08B 13/00 Burglar, theft or intruder alarms
• CPC Class Codes: G08B 13/189 using passive radiation detection systems
• CPC Class Codes: G08B 13/1895 using light change detection systems G08B13/194 takes precedence
• CPC Class Codes: G08B 15/00 Identifying, scaring or incapacitating burglars, thieves or intruders, e.g. by explosives
• CPC Class Codes: G08B 15/002 with occupancy simulation
• CPC Class Codes: G08B 5/36 using visible light sources
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: H05B 39/042 by measuring the incident light
• CPC Class Codes: H05B 39/044 continuously H05B39/042 takes precedence
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/12 using optical feedback
• CPC Class Codes: H05B 45/14 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/37 Converter circuits
• CPC Class Codes: H05B 45/44 with an active control inside an LED matrix
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines
• CPC Class Codes: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices
• CPC Class Codes: H05B 47/10 : Controlling the light source
• CPC Class Codes: H05B 47/105 : in response to determined parameters
• CPC Class Codes: H05B 47/11 : by determining the brightness or colour temperature of ambient light
• CPC Class Codes: H05B 47/115 : by determining the presence or movement of objects or living beings
• CPC Class Codes: H05B 47/16 : by timing means
• CPC Class Codes: H05B 47/17 : Operational modes, e.g. switching from manual to automatic mode or prohibiting specific operations
• CPC Class Codes: Y02B 10/10 : Photovoltaic [PV]
• CPC Class Codes: Y02B 20/40 : Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

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.

Claims

1. A two-level LED security light comprising:

a light-emitting unit;

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 controller electrically coupled with a controllable semiconductor switching device, wherein the controllable semiconductor switching device is electrically connected in series with the power supply unit and the light-emitting unit, wherein the controller with program codes outputs a pulse width modulation (PWM) signal to control a conduction period T_on and a cut-off period T_off of the controllable semiconductor switching device for delivering different average electric currents from the power supply unit to drive the light-emitting unit for generating different illuminations, wherein the controller controls the controllable semiconductor switching device respectively to have a short T_on and a long T_on of the conduction period such that the light-emitting unit respectively generates a low level and a high level illuminations according to signal(s) received from the light sensing control unit and the motion sensing unit.

2. A two-level LED security light comprising:

a light-emitting unit;

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 non-angle adjustable to provide illumination projection along a fixed direction;

wherein the loading and power control unit comprises a controller electrically coupled with a controllable semiconductor switching device, wherein the controllable semiconductor switching device is electrically connected in series with the power supply unit and the light-emitting unit, wherein the controller with program codes outputs a pulse width modulation (PWM) signal to control a conduction period T_on and a cut-off period T_off of the controllable semiconductor switching device for delivering different average electric currents from the power supply unit to drive the light-emitting unit for generating different illuminations, wherein the controller controls the controllable semiconductor switching device respectively to have a short T_on and a long T_on of the conduction period such that the light-emitting unit respectively generates a low level and a high level illuminations according to signal(s) received from the light sensing control unit and the motion sensing unit.