Lighting device having illumination compensation function and method thereof

Patent metadata

Field	Value
Publication number	US-2023292414-A1
Application number	US-202217857037-A
Country	US
Kind code	A1
Filing date	Jul 3, 2022
Priority date	Mar 11, 2022
Publication date	Sep 14, 2023
Grant date	—

Abstract

A lighting device includes a light source, a conducting wire, a controller and a coding switch. The conducting wire is connected to the light source. The controller is connected to a power source and a conducing wire. The coding switch is connected to the controller. The coded value of the coding switch is adjustable, such that the coded value is corresponding to the wire length of the conducting wire. The controller adjusts the duty cycle of a driving signal according the wire length corresponding to the coded value, and outputs the driving signal to the light source in order to drive the light source. The lighting device can provide the illumination compensation function via the coding switch without a phototube, which can significantly reduce the cost of the lighting device in order to satisfy the actual requirements.

First claim

1 . A lighting device having illumination compensation function, comprising:
a light source; a conducting wire, connected to the light source; a controller, connected to a power source and the conducting wire; and a coding switch, connected to the controller, wherein a coded value of the coding switch is adjustable, whereby the coded value is corresponding to a wire length of the conducting wire; wherein the controller adjusts a duty cycle of a driving signal according the wire length corresponding to the coded value, and outputs the driving signal to the light source in order to drive the light source, wherein the duty cycle of the driving signal is a sum of a reference duty cycle, and a product of the wire length of the conducting wire and a compensation coefficient.

2 . The lighting device having illumination compensation function as claimed in claim 1 , wherein the coding switch has a plurality of buttons, and on/off states of the buttons are corresponding to different coded values respectively.

3 . (canceled)

4 . The lighting device having illumination compensation function as claimed in claim 1 , wherein the compensation coefficient is a ratio of the duty cycle of the driving signal to the wire length of the conducting wire.

5 . The lighting device having illumination compensation function as claimed in claim 1 , wherein the light source is a lighting-emitting diode (LED) or an LED array.

6 . An illumination compensation method for a lighting device, comprising:
connecting a conducting wire to a light source; connecting a controller to a power source and the conducting wire; connecting a coding switch to the controller; adjusting a coded value of the coding switch to make the coded value be corresponding to a wire length of the conducting wire; adjusting a duty cycle of a driving signal of the controller according to the wire length corresponding to the coded value by the controller, wherein the duty cycle of the driving signal is a sum of a reference duty cycle, and a product of the wire length of the conducting wire and a compensation coefficient; and outputting the driving signal to the light source by the controller so as to drive the light source.

7 . The illumination compensation method for the lighting device as claimed in claim 6 , wherein the coding switch has a plurality of buttons, and on/off states of the buttons are corresponding to different coded values respectively.

8 . (canceled)

9 . The illumination compensation method for the lighting device as claimed in claim 6 , wherein the compensation coefficient is a ratio of the duty cycle of the driving signal to the wire length of the conducting wire.

10 . The illumination compensation method for the lighting device as claimed in claim 6 , wherein the light source is an LED or an LED array.

Assignees

• Xiamen Pvtech Co Ltd

Inventors

• Lu Fuxing
• Liu Rongtu
• Ye Hao

Classifications

• H05B45/30 Primary

  Driver circuits · CPC title

• H05B47/10

  Controlling the light source · CPC title

• Y02B20/40

  Control techniques providing energy savings, e.g. smart controller or presence detection · CPC title

• H05B45/10 Primary

  Controlling the intensity of the light · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title