Dimensioning of Ultra-Compact and Efficiency Power Electronics Featuring Active Pulsating Power Buffer for On-board EV Chargers
Shiyu Feng (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Thiago B. Soeiro – Mentor (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Pavol Bauer – Graduation committee member (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Alex Stefanov – Graduation committee member (TU Delft - Electrical Engineering, Mathematics and Computer Science)
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Abstract
The Electric Vehicle (EV) charging market is very dynamic. The so-called AC-type chargers can be found confined within the vehicle or on-board. This must be able to withstand the harsh environment with an ambient temperature of above 75℃. Therefore, compact and high-efficiency power electronics and implementing electrolytic-less capacitors in the power range of 6 kW to 12 kW is desired. The operation of the grid-connected power stage with DC active power buffer has become standard in high compact systems. More importantly, this solution eliminates the requirement of high energy storage in the DC-link because the pulsating power is compensated leading to an electrolytic-less capacitor design. As the lifetime of the power converter in high-temperature environments is typically limited by the usage of the electrolytic capacitor technology, a more reliable system is finally obtained with the active pulsating power buffer.