This paper presents design of an isolated high-step-down DC-DC converter based on a class-DE power stage, operating at a 10 MHz switching frequency using enhancement mode Gallium Nitride (GaN) transistors. The converter operating principles are discussed, and the power stage design rated for 20 W is presented for a step-down from 200-300 V to 0-28…
Distributed energy generation (DEG) solely based on renewable energy sources (RES) provides a promising solution to today’s climate problems. However, DEG systems negatively impact grid stability. As such, researchers have proposed the utilization of electric vehicles (EVs) in order to improve grid stability through the provision of real and reactive power. Such schemes are known…
Zero voltage switching assistance design for DC-DC series resonant converter with constant input current for wide load range In under-sea dc power distribution systems, constant current feed is preferred over constant voltage feed for robustness against long distance cable impedance. The input voltage of each power converter module in a series connected dc power distribution…
Isolated grid-connected inverters are typically constructed of two stages, namely a voltage-source inverter stage and an isolated bidirectional dc-dc converter stage. Recently, two dual-bridge isolated series resonant dc-dc converters are used to synthesize segments of the line current and reconstruct the complete sinusoidal line currents using a three-phase unfolder. The unfolder technique synthesizes high quality…
Ultrasonic applications require precise knowledge of the dispatched wave in order to process the returning signal. In this work, a cost effective two stage resonant sinusoidal source is presented, capable to adjust on demand both frequency and amplitude of the sinusoidal output. The source tunes automatically to the load parameters using pre-calibration, and is able…
Electric-drive vehicles, including hybrid, plug-in hybrid, and electric vehicles, require a high-voltage (HV) battery pack for propulsion and a low-voltage (LV) dc bus for auxiliary loads. This paper presents an architecture that uses modular dc-dc bypass converters to perform active battery cell balancing and to supply current to auxiliary loads, eliminating the need for a…