Translate 
Abstract
Abstract This paper proposes a battery charger system based around a high step-down DC–DC converter, which is capable of stepping down a 400-V input to a 25.6 V for charging a lithium-ion battery pack. The converter combines features of cascaded and interleaved buck converters, while also incorporating a switched capacitor. Hence, the converter can provide a higher step-down voltage gain for a given duty cycle. A constant current–constant voltage (CC–CV) control technique is used as the charging scheme. The battery charging capability of the converter is validated experimentally by building a 160-W lab-scale prototype for 0.5C and 1C charging rates. For result verification, a comparative analysis is conducted between the charging characteristics of the proposed prototype and a commercially available battery tester. The result shows a maximum average error of 0.87% and 0.56% for 0.5C and 1C charging rates, respectively. The converter’s ability to achieve over 92% charging efficiency across various charging rates demonstrates its suitability for charging light electric vehicles (LEVs).
Highlights
Increasing proliferation of internal combustion engine (ICE)based vehicles in recent years has become a great cause for concern, owing to its contribution toward greenhouse gas emissions [1]
The most common strategy is the constant current–constant voltage (CC-CV) control [17], which has been discussed at length in early literature [18, 19]
In the CV mode, the current control loop (CCL) reference value is derived from the output of the voltage control loop (VCL)
Summary
Increasing proliferation of internal combustion engine (ICE)based vehicles in recent years has become a great cause for concern, owing to its contribution toward greenhouse gas emissions [1]. The most common strategy is the constant current–constant voltage (CC-CV) control [17], which has been discussed at length in early literature [18, 19] In these works, advantages of this charging algorithm are highlighted, such as simple design, and a relatively longer battery life—provided the CC time is larger than the CV time. The authors of [20, 21] have developed a CC–CV algorithm through a mode selector switch between the current and voltage control loops Based on these findings, the cascade control strategy is more reliable compared to the mode selector approach due to a more seamless transition between CC and CV charging. The literature discussed so far indicates that there is considerable work done on DC–DC converters and their usage in LEV charging applications This includes works on charging control strategies such as CC-CV.
Sign-in/Register to view highlights & summary 
Paper version not known (
Free)
Published Version
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
