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Wide bandgap devices (WBGs) allow Power Factor Correction (PFC) circuits to operate at MHz frequency which leads to a better power density. Compared with kHz operation, MHz PFC in critical conduction mode (CrM) yields larger inductor valley current during the switch soft turn-on. Moreover, the input current distortion near grid voltage zero crossing has not been taken into account in the traditional...
Gallium Nitride (GaN) power devices become commercially available in recent years and they have demonstrated great potential in DC power supply applications. In this paper, the device loss of three GaN device based isolated DC/DC circuits, LLC circuit, dual active bridge (DAB) circuit and phase shift quasi switched capacitor (QSC) circuit, is investigated and compared using telecom power supply application...
The Quasi-Switched-Capacitor (QSC) resonant converter has been proposed to serve as the isolated dc/dc stage of ac/dc power adapters for portable electronics. Compared to Flyback and LLC resonant converters, its features include: 1) the voltage stress on the primary-side switches is reduced to 2/3 of the input voltage, which is friendlier to low-voltage switches whose figure of merits is generally...
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