Abstract
In order to solve the considerable issues of air pollution, climate warming and fossil energy shortage, many governments around the world have formulated policies to encourage the development of electric vehicles over the past decade. This paper proposes a three-level dual-active-bridge (DAB) converter with blocking capacitors for bidirectional electric vehicle charger. In the proposed three-level DAB converter, two blocking capacitors are placed in series with the two windings of the transformer, respectively. Both of the two three-level bridges can operate in four modes, and generate square waves with four kinds of amplitude. Therefore, the proposed three-level DAB converter can adapt to the wide voltage range of electric vehicle. A working mode selection algorithm is developed to minimize the transformer RMS current of the three-level DAB converter. The optimal working mode can be selected in real time according to the voltage ratio and the active power. Finally, experimental results are presented to verify the feasibility and the advantage of the proposed three-level DAB converter.
Highlights
Air pollution, global warming, and incremental energy cost are considerable issues of the present world
Considering the above mentioned problem, this paper proposes a three-level DAB converter with blocking capacitors for bidirectional Electric vehicle (EV) charger
It can be observed that the ‘‘voltage-match’’ points range from 0.25 to 4. This means that the three-level DAB converter with blocking capacitors is suitable for wide output voltage range applications
Summary
Global warming, and incremental energy cost are considerable issues of the present world. Y. Xuan et al.: Three-Level DAB Converter With Blocking Capacitors for Bidirectional EV Charger. None of the bidirectional three-level DC-DC converters mentioned above have an enough wide output voltage range for electric vehicles. Considering the above mentioned problem, this paper proposes a three-level DAB converter with blocking capacitors for bidirectional EV charger. The conversion efficiency of the proposed three-level DAB converter is improved over a wide output voltage range. The two zero-level switching states should be selected alternately in order to keep the flying capacitor voltage equal to 0.5V1. As Fig. presents, by selecting appropriate switching states, the three-level full bridge can operate in four working modes. The two zero-level switching states, O1 and O2, are used in turn in order to keep the flying capacitor voltage equal to 0.5V1, as shown in Fig.
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