Illumination device and control method thereof

• US 20100289410A1
• Filed: 04/06/2010
• Published: 11/18/2010
• Est. Priority Date: 05/18/2009
• Status: Abandoned Application

• Current Assignee: Young Green Energy Co. (Coretronic Corporation)
• Original Assignee: Young Green Energy Co. (Coretronic Corporation)
• Inventors: Chou, Chih-Cheng, Chang, Ken-Chih, Wu, Chin-Hao, Wu, Shang-Hsuang
• Application Number:
  US12/662,206
• Publication Number:
  US 20100289410A1
• Time in Patent Office: Days
• US Class Current: 315/112
• CPC Class Codes: H05B 45/18 using temperature feedback

Abstract

An illumination device and a control method thereof are provided. The illumination device includes a fan and a light emitting diode module capable of emitting a light beam. The control method includes: detecting a fan signal of the fan; determining whether an operation of the fan is abnormal according to the fan signal, wherein a driving current of the LED module is reduced when the operation of the fan is determined to be abnormal; and a driving current of the LED module is reduced to a predetermined rang of the normal rated driving current when the fan is determined to be stop according to the fan signal.

Claims

1. A control method of an illumination device, the illumination device comprising a fan and a light emitting diode module capable of emitting a light beam, the control method comprising:

detecting a fan signal of the fan;

determining whether an operation of the fan is abnormal according to the fan signal, wherein a driving current of the light emitting diode module is reduced when the operation of the fan is determined to be abnormal; and

a driving current of the light emitting diode module being reduced to a predetermined range of the normal rated driving current when the fan is determined to be stop according to the fan signal.

2. The control method of the illumination device of claim 1, further comprising:

sending an abnormal signal to a control center outside of the illumination device when the operation of the fan is determined to be abnormal.

3. The control method of the illumination device of claim 1, further comprising:

detecting an environment temperature outside of the illumination device and determining a reduced level of the driving current according to the environment temperature when the operation of the fan is determined to be abnormal.

4. The control method of the illumination device of claim 1, wherein the fan comprises an operation detector configured to generate the fan signal according to the operation of the fan.

5. The control method of the illumination device of claim 1, wherein the predetermined range is greater than or equal to 30% and less than or equal to 90%.

6. The control method of the illumination device of claim 1, wherein the fan comprises a pulse generator configured to generate the fan signal, and a frequency of the fan signal is in direct proportion to the rotation speed of the fan.

7. The control method of the illumination device of claim 6, further comprising:

determining a reduced level of the driving current according to the frequency of the fan signal when the operation of the fan is determined to be abnormal.

8. An illumination device, comprising:

a light emitting diode module comprising at least one light emitting diode;

a fan capable of generating a convective air flow inside of the illumination device and generating a fan signal;

a driver electrically connected to the light emitting diode module and the fan and capable of driving the light emitting diode module to emit a light beam; and

a control circuit electrically connected to the fan and the driver and capable of receiving the fan signal and determining whether an operation of the fan is abnormal according to the fan signal, wherein a driving current of the light emitting diode module is reduced by the control circuit when the operation of the fan is determined to be abnormal according to the fan signal and the driving current of the light emitting diode module is reduced to a predetermined range of the normal rated driving current by the control circuit when the fan is determined to be stop according to the fan signal.

9. The illumination device of claim 8, wherein the driver sends an abnormal signal to a control center outside of the illumination device, when the fan is determined to be abnormal.

10. The illumination device of claim 8, further comprising:

a thermal sensor electrically connected to the control circuit and configured to detect an environment temperature outside of the illumination device;

wherein the control circuit determines a reduced level of the driving current according to the environment temperature when the operation of the fan is determined to be abnormal.

11. The illumination device of claim 8, wherein the fan comprises an operation detector configured to generate the fan signal according to the operation of the fan.

12. The illumination device of claim 8, wherein the predetermined arrange is greater than or equal to 30% and less than or equal to 90%.

13. The illumination device of claim 8, wherein the fan comprises a pulse generator configured to generate the fan signal and a frequency of the fan signal is in direct proportion to the rotation speed of the fan.

14. The illumination device of claim 13, wherein the control circuit determines a reduced level of the driving current according to the frequency of the fan signal when the operation of the fan is determined to be abnormal.

15. The illumination device of claim 8, wherein the control circuit adjusts the driver by using pulse width modulation to drive the driving current of the light emitting diode module.

16. The illumination device of claim 8, wherein the control circuit adjusts the driver by adjusting the voltage to drive the driving current of the light emitting diode module.