AC/DC Four-Switches Boost Buck Converter for EV Battery Charging

Nowadays, the on-board battery charger is a high dominant trend in research. For the AC/DC stage, many topologies are proposed worldwide without having true benchmarks among these different structures. Conventional single switch buck-boost converters were utilized earlier in various applications. However, it could not meet the requirements of the on-board battery charger due to higher component stresses and low reliability in high-power applications. Thus, AC/DC four switches boost buck converters are desirable, in which the boost cascaded with buck is superior because of the primary benefit of having a continuous input current. Moreover, they are more reliable, highly efficient, and have a significant operating capability as buck or boost mode according to the battery state of charge. This paper will examine four different kinds of four switches boost buck by comparing their input current ripple and magnet design. Furthermore, the lowest input current ripple converter will be selected for modeling and validate it experimentally.