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This paper presents a comparison study of three isolated DC/DC circuit topologies, LLC resonant circuit, phase shift bridge circuit and phase shift quasi switched capacitor (QSC) circuit. The device stress of three circuits is compared using total switching device power (SDP) which can be used as an indicator of circuit efficiency, device cooling requirement, device packaging requirement and cost...
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 medium power rating two-level three phase voltage source inverter is among the most popular power conversion systems. The typical switching frequency of the commercial medium power rating inverter, however, is limited to tens of kHz. By increasing the switching frequency and using emerging gallium-nitride devices, the size of the overall system can be greatly reduced. This paper begins by reviewing...
Paralleling devices is an effective way to achieve higher power applications while still having the convenience brought by discrete devices. However, very few papers investigate the challenges of paralleling Gallium Nitride high electron mobility transistors (GaN HEMTs) in cascode configuration, especially the potential failure modes and its related mechanisms. In this paper, a comprehensive study...
This paper introduces a high step-up ratio isolated dc-dc circuit which can be used as an interface between 20 V-40 V PV panels and high voltage dc system, up to 1000 V. By combining the switched inductor (SL) and quasi switched capacitor (QSC) structures with the traditional isolated full bridge circuit, the 50 times boost ratio is realized with small turns ratio. In this case, the leakage inductance...
The general way to design the output inductor is taking the critical discontinue current as the basis, then selecting the inductor current ripple according to the experiential equations to calculate the inductor value. This method neglects the effects of the inductor current ripple on the overall stresses of the converter, and can't provides ideal output inductor values, so it will affect the actual...
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