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This paper aims to study an active-clamped resonant flyback converter. The proposed resonant technique can increase the zero-voltage switching (ZVS) range. Gallium Nitride high electron mobility transistor (GaN HEMT) devices are also applied in this study to reduce the switching losses at high-frequency operation. Synchronous rectifier is designed on secondary side to minimize the conduction losses...
This paper designs and implements a high-voltage DC power supply with wide-range output voltage up to 30kV. There are two stages for the power conversion. The pre-stage circuit is a transition-mode (TM) power factor correction (PFC) converter for improving input power factor and providing a regulated 380V DC output. The post-stage is a DC/DC converter, to use a buck-type current-fed push-pull as its...
In this paper, a contact-less power charger for robot applications is studied and developed. Non-contact charging can be achieved by a separable magnetic-transformer design. The transformer primary core is in the charger unit and the secondary core is in the robots. The transformer air-gap is equal to the distance between these two parts. By theoretical analysis, software simulations and circuit implementation,...
This paper presents a module-integrated isolated solar micro-inverter with pseudo-DC link. The studied grid-tied micro-inverters can individually extract the maximum solar power from each photovoltaic (PV) panel and transfer to the AC utility system. High conversion efficiency and high maximum power point tracking (MPPT) accuracy can be achieved with the studied pseudo-DC link topology. The operation...
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