LED security light and LED security light control device thereof

• US 10,028,351 B2
• Filed: 12/12/2016
• Issued: 07/17/2018
• 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): Barnie, Rexford
• Assistant Examiner(s): DHILLON, JAGDEEP S
• Application Number:
  US15/375,746
• Publication Number:
  US 20170094743A1
• Time in Patent Office: 582 Days
• Field of Search: 307 72, 307 66, 307 91, 307 101, 307 43, 307 64, 307 31, 307 29, 315291, 315360, 315149, 315362, 362231, 362 20
• CPC Class Codes: G08B 13/189 using passive radiation detection systems
• CPC Class Codes: G08B 15/00 Identifying, scaring or incapacitating burglars, thieves or intruders, e.g. by explosives
• CPC Class Codes: H02J 7/35 with light sensitive cells
• 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 45/44 with an active control inside an LED matrix
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines
• CPC Class Codes: H05B 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 47/19 via wireless transmission
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

A LED security light includes a power supply unit, a light sensing unit, a motion sensor unit, a loading and power control unit, an external control unit and a light-emitting unit. In responding respectively to signals outputted from the light sensing unit and the motion sensor unit, the LED security light is turned on at dusk for generating different level illuminations performed by the light emitting unit and turned off at dawn. The light emitting unit includes one or a plurality of LEDs. The external control unit is for setting illumination characteristics of the light emitting unit. The power supply unit comprises a solar power module as a first power source and a backup battery module as a second power source.

Claims

1. A LED security light, comprising:

a light emitting unit;

a photo sensor unit;

a motion sensor unit;

a loading and power control unit;

a power supply unit comprising a first power source and

a second power source; and

a first external control unit electrically connected to the loading and power control unit;

wherein the light emitting unit comprises an unidirectional semiconductor switching device electrically connected in series with a LED lamp;

wherein the loading and power control unit comprises a controller electrically coupled with the unidirectional semiconductor switching device, the photo sensor unit and the motion sensor unit respectively;

wherein the controller is operated in conjunction with a power switching circuitry for selecting and connecting at least one of the first power source and the second power source to the light emitting unit for powering the LED lamp;

wherein when the first power source is connected to the light emitting unit, the controller activates a first subroutine to output a first pulse width modulation signal to control a conduction state or cutoff state of the unidirectional semiconductor switching device to deliver different average electric currents to the LED lamp to perform different illuminations according to signals received from the photo sensor unit and the motion sensors unit;

wherein when an ambient light detected by the photo sensor unit is lower than a first predetermined value of an environmental light intensity, the loading and power control unit activates the motion sensor unit and manages the LED lamp to perform a first low level light intensity, wherein the first low level light intensity includes an option of zero light intensity;

wherein when the ambient light detected by the photo sensor unit is higher than a second predetermined value of the environmental light intensity, the loading and power control unit operates to deactivate the motion sensor unit and manages to cutoff the conduction of the unidirectional semiconductor switching device;

wherein when a motion intrusion is detected by the motion sensor, the loading and power control unit manages to increase an average electric current to drive the LED lamp for generating a first high level light intensity to create an effect of security alert;

wherein when the second power source is connected to the light emitting unit, the controller activates a second subroutine to output a second pulse width modulation signal to control a conduction state or cutoff state of the unidirectional semiconductor switching device to deliver different average electric currents to drive the LED lamp to perform different illuminations according to signals received from the photo sensor unit and the motion sensor unit;

wherein when the ambient light detected by the photo sensor unit is lower than the first predetermined value of the environmental light intensity, the loading and power control unit activates the motion sensor unit and manage to perform a second low level light intensity, wherein the second low level light intensity includes the option of zero light intensity;

wherein when the ambient light detected by the photo sensor unit is higher than the second predetermined value of the environmental light intensity, the loading and power control unit operates to deactivate the motion sensor unit and manages to cutoff the conduction of the unidirectional semiconductor switching device;

wherein when the motion intrusion is detected by the motion sensor unit, the loading and power control unit manages to increase an average electric current to drive the LED lamp for generating a second high level light intensity, wherein the first high level light intensity is greater than the second high level light intensity;

wherein the first external control unit is electrically coupled to the controller for setting respectively a time duration of said illumination.

2. The LED security light according to claim 1, wherein the first power source is a solar power module comprising a solar panel for converting solar light into electrical energy, a charging circuit and a power storage unit for storing the electrical energy.

3. The LED security light according to claim 1, wherein the power switching circuitry comprises a voltage detector for detecting an output voltage of the first power source during an operating period of the LED security light;

wherein when the output voltage of the first power source detected by the voltage detector is equal to or greater than a first predetermined threshold voltage, the controller manages to operate the power switching circuitry to connect the first power source to the light emitting unit.

4. The LED security light according to claim 3, wherein when the output voltage of the first power source detected by the voltage detector of the power switching circuitry is lower than a second predetermined threshold voltage, the controller manages to operate the power switching circuitry to connect the second power source to the light emitting unit.

5. The LED security light according to claim 4, wherein the power switching circuitry includes a first power switching element, wherein when the power switching circuitry is operated to connect the second power source to the light emitting unit, the controller manages to turn on the first power switching element.

6. The LED security light according to claim 4, wherein when the power switching circuitry operates to connect the second power source to the light emitting unit, the controller manages to continuously connect the first power source to the light emitting unit.

7. The LED security light according to claim 1, wherein the second power source is a non-rechargeable battery unit.

8. The LED security light according to claim 1, wherein the second power source is a rechargeable battery unit.

9. The LED security light according to claim 1,

wherein the first power source is a solar power module and the second power source is a rechargeable battery unit;

wherein when the solar power module is in a charging state operated by a charging circuit, the power switching circuitry utilizes a voltage detector to detect the output voltage of the first power source being equal to a maximum voltage level designed for the first power source indicating the first power source is fully charged, the controller manages the charging circuit to connect to the second power source, wherein when the output voltage of the second power source becomes equal to a second maximum voltage level designed for the second power source indicating the second power source is fully charged, the controller further manages the charging circuit to reconnect with the first power source.

10. The LED security light according to claim 1, wherein a second external control unit is further installed to be electrically coupled with the controller for adjusting the first low level light intensity in an operating range between 0% and 50% of a maximum illumination capacity designed for the first power source.

11. The LED security light according to claim 1, wherein a third external control unit is further installed to be electrically coupled with the controller for adjusting the first high level light intensity in an operating range between 50% and 100% of the maximum illumination capacity designed for the first power source.

12. The LED security light according to claim 1, wherein the second external control unit is also used for adjusting the second low level light intensity in an operating range between 0% and 50% of a maximum illumination capacity designed for the second power source.

13. The LED security light according to claim 1, wherein the third external control unit is also used for adjusting the second high level light intensity in an operating range between 50% and 100% of the maximum illumination capacity designed with the second power source.

14. The LED security light according to claim 5, wherein the first power switching element is a transistor.

15. The LED security light according to claim 5, wherein the first power switching element is a relay.