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Optimal techniques for power supply with transient current circuit are introduced in this paper. The circuit reduces switching loss of buck converter's main switch effectively. However, in our previous researches, it could be operated with high efficiency only at heavy loading. The techniques to get rid of this disadvantage are proposed and the validity of it is verified through experiments.
Soft switching for power factor collection (PFC) of high-end server power supply unit (PSU) is studied. FET loss of PFC circuit is caused by Ron-related loss and switching loss. The switching loss consists of switching-speed-related part and output capacitance (Coss)-related part. The switching-speed related-part can be reduced by using a high-speed FET and high-power gate driver; however, Coss-related...
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