| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 99 === This thesis developed a 500 watt power supply for personal computer applications. A continuous conduction mode power factor corrector is used as the pre-regulator for improving the input power factor and reducing the total harmonic distortion of the input current. A half-bridge series resonant converter with synchronous rectification is adopted as the DC-DC conversion stage. Switching losses on the primary switches and conduction losses on the secondary rectifier can be significantly reduced. Two synchronous buck converters are implemented to step down the 12 V bus voltage to 5 V and 3.3 V output voltages, respectively. A flyback converter is adopted to provide the auxiliary and standby power supply.
The output specifications of the developed power supply are: 12 V/26 A, 5 V/20 A, 3.3 V /20 A, -12 V/1 A with an additional 5 V/2 A standby power supply. Experimental results of a prototype circuit are shown to verify the feasibility of the studied power supply system. Both the conversion efficiency and power factor meet the requirements of Energy Star specifications.
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