Abstract
This study examines the control methods to improve the efficiency of modular chargers for electric vehicles. A modular charger is a system that combines modular power converters in parallel as much as necessary. Power converters are low in efficiency under light loads and maintain high efficiency under heavy loads. The modular charger including a plurality of modules could control the number of modules driven in parallel according to a charging amount required for an electric vehicle, thereby reducing an operation in a light load section and improving the overall efficiency of the charger. However, this method concentrates the load on some modules, and the life of the modules connected in parallel could becomes unbalanced. The modules could be operated uniformly by controlling the modules based on the result of monitoring the number of operations. This paper researched a method to improve the efficiency of a charger system by selecting and operating the modules depending on the charging load and number of operating of modules.
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