Patent ID: 7733035

Claim:
A power supply device comprising a rectifier, an energy conversion system, a feedback circuit, a photo-coupling circuit, a system heat detection circuit, and a light-emitting diode (LED) module serving as a load end, and characteristic in that: in the rectifier, a bridge rectification circuit is adapted to convert an alternate current (AC) power into direct current (DC) pulses of positive cycles of Sine-wave, which are subjected to processing by filter capacitor means to become a DC voltage; in the energy conversion system, filtered wave of the filter capacitor means applies an oscillation signal to the energy conversion system, by which an alternate signal is transformed from a primary side of a transformer to a secondary side to induce a lowered voltage, the alternating pulsed AC power being then converted into DC power by fast diode means; in the feedback circuit, a portion of an output signal from the energy conversion system is applied to the photo-coupling circuit and the feedback circuit, wherein when variation occurs in the load end, the photo-coupling circuit first detects the variation and amplifies and applies an error signal to the feedback circuit and wherein the feedback circuit bases on a reference voltage to carry out reference voltage correction and applies the corrected signal to the energy conversion system; in the photo-coupling circuit, a voltage regulation mechanism is included and coupled to the LED module of the load end for amplification and application of the error signal to feedback circuit for reference voltage correction; in the system heat detection circuit, temperature detection is carried out for effectively providing protection and providing a detection preset reference to the photo-coupling circuit and the feedback circuit to allow the energy conversion system to gradually decrease/increase energy conversion for realizing heat balance that provides optimum operation environment and operation temperature; and the LED module of the load end is coupled to the voltage regulation mechanism of the photo-coupling circuit and the LED module is formed as a circuit that is composed of series-connected LEDs and/or parallel-connected LEDs and/or combinations of series-connected LEDs and parallel-connected LEDs.