| Summary: | 碩士 === 國立臺北科技大學 === 電機工程系所 === 101 === The purpose of the thesis is to develop a power supply with high efficiency and low stand-by power consumption. The power supply is constructed with an electromagnetic interference (EMI) filter which can efficiently reduce EMI issues caused by the system. The pre-stage adopts a boost Power Factor Corrector to increase the power factor and decrease the current harmonic, thus improves the power quality and harmonic issue. The post-stage adopts a flyback converter circuit and operates with a synchronous rectification technique. As a result, the power consumption on the secondary circuit has been significantly reduced and the efficiency of power supply can be raised. When the output loading is tiny, the pulse-width modulation control circuit can close power factor corrector circuit and diminish the loss of power factor stage. In addition, by closing the pulse width modulation stage on the stand-by mode control circuit will greatly decrease the stand-by power consumption under no-load condition.
In conclusion, the thesis implements a high efficient power supply with low stand-by power consumption of which specifications include input voltage range of 90~264 Vac and output of 19 Vdc / 90 W. The practice power supply is implemented to test and verify the compliance with the of EPA requirements and Energy Star regulations.
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