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Wide bandgap (WBG) semiconductor devices allow power electronic converters to achieve higher efficiency, higher power density and potentially higher reliability. However, the design challenges accompanied by applying the new WBG devices have risen accordingly. In this paper, a non-isolated bidirectional DC-DC converter equipped with Gallium Nitride (GaN) semiconductor transistors is presented. The...
This paper presents a unidirectional three phase inverter with a high frequency link. This topology can be used for the grid integration of renewable energy sources like photovoltaic, fuel cell etc, where power flow is unidirectional. The use of high frequency transformer (HFT) results in reduction of cost with improved power density. The switches in the proposed converter are either zero voltage...
A low-cost isolated high step-up dc-dc converter with a single switch and multiple output cells is proposed. The magnetizing inductance of the multiple-winding transformer and a multitude of capacitors are used to form a parallel LC resonant link. The capacitors create a Zero Voltage Switching (ZVS) condition at turn-on and turn-off and reduce the switching losses of the switch and diodes. Rate of...
This paper proposed a new topology that can achieve high-step-down conversion compared with traditional buck converter. A coupled inductor is employed to extend duty cycle which is for high-step-down applications. Soft-switching of all switches can be achieved. A prototype with 24 V input 5 V/2 A output is given to verify the circuit operation. Switching frequency is up to 1.3 MHz to minimize magnetics...
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