Abstract
In this paper, an interleaved high-power zero-current-switching (ZCS) onboard charger (OBC) based on the three-phase single-switch buck rectifier is proposed for application to plug-in electric vehicles (EVs). The multi-resonant structure is used to achieve high efficiency and high power density, which are necessary to reduce the volume and weight of the OBC. This study focuses on the border conditions of ZCS converting with a battery load, which means the variation ranges of the output voltage and current are very large. Furthermore, a novel hybrid control method combining pulse frequency modulation (PFM) and pulse width modulation (PWM) together is presented to ensure a driving frequency higher than 10 kHz, and this will reduce the unexpected inner resonant power flow and decrease the total harmonic distortion (THD) of the input current under a light load at the end of the charging process. Finally, a prototype is established, and experiments are carried out. According to the experimental results, the conversion efficiency is higher than 93.5%, the THD about 4.3% and power factor (PF) 0.98 under the maximum power output condition. Besides, a three-stage charging process is also carried out the experimental platform.
Highlights
Due to the environmental and energy crises, more and more researchers are paying attention to novel energy vehicles, such as electric vehicles (EVs) and hybrid electric vehicles (HEVs)
It is widely known that battery chargers play a critical role in the development of EVs, and the charging time and lifetime of batteries are closely related to the characteristics of the chargers
Different from FBCs, onboard charger (OBC) mean taking the chargers with the vehicles and having relatively higher flexibility, which makes it possible to get charged through a socket
Summary
Due to the environmental and energy crises, more and more researchers are paying attention to novel energy vehicles, such as electric vehicles (EVs) and hybrid electric vehicles (HEVs). The buck IPQCs with high-frequency switching devices are extensively used in battery charging for automotive applications [16] These circuits can reduce the filter size and weight and enhance the efficiency of the system. Erickson and Yungtaek Jang proposed a new zero-current-switching (ZCS) three-phase high quality rectifier, which is illustrated in Figure 3 [15,20,21] In this three-phase ZCS buck circuit, continuous input and output currents, a high power factor and low harmonic rectification are achieved. In view of the aforementioned advantages, this three-phase ZCS buck topology is adopted and optimized in this article This topology can satisfy the requirement of single-stage OBC in general, the battery characteristics and the ZCS boundary condition of the multi-resonant tank, as well as their influence on each other have to be considered.
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