Abstract
Although the sales volume is increasing yearly due to the improved technological maturity of electric vehicles (EVs), the charging infrastructure is insufficient. In addition, localization and technology development for power modules in a fast charging system is required. In this paper, a design and implementation of a power module for an EV ultra-fast charging system are proposed. In the power module, which has a 30 kW maximum power capacity, the AC/DC rectifier stage uses a Vienna rectifier topology, and the isolated DC/DC converter stage uses an LLC resonant converter topology. The LLC resonant converter controls the output voltage to respond to a wide output voltage of 150V to 1000V. In addition, in order to realize a wide output voltage range, a single relay is used on the secondary side of the LLC resonant converter to achieve a wide voltage range through the predefined two-mode selection. The validity and reliability of the proposed power module are verified through the experimental results for various load conditions.
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