The light source module 13 is connected to the DC-to-DC converting module 12. In one embodiment, the light source module 13 can be a light-emitting diode (LED), several LEDs connected in series, an LED array, a bulb, or similar components.

The over-current short-circuit protection module 14 is connected to the light source module 13. The self-locking protection module 15 is connected to the over-current short-circuit protection module 14 and the power supplying module 11. The integral module 16 is connected to the self-locking protection module 15. The reference voltage generating module 17 is connected to the power supplying module 11, the self-locking protection module 15, and the over-current short-circuit protection module 14.

The embodiment just exemplifies the present invention and is not intended to limit the scope of the present invention; any equivalent modification and variation according to the spirit of the present invention is to be also included within the scope of the following claims and their equivalents.

Please refer to FIG. 2, which is the schematic view of the operating state of the lighting device having resettable over-current protection function in accordance with one embodiment of the present invention. As shown in FIG. 2, the power supplying module 11 generates an input voltage Vin.

Then, the DC-to-DC converting module 12 converts the input voltage Vin into generate a driving voltage Vd and outputs the driving voltage Vd to the light source module 13 so as to drive the light source module 13.