A new single stage, isolated, 3 phase AC/DC converter at 20KW level for electric vehicle charging purpose is proposed. The converter combines the dual stage of PFC+LLC converter into a single stage and thus achieves less than 2% total semiconductor losses. Intermediate DC bus is maintained at 900V to reduce the THD below the regulatory requirements and low switching losses of SiC switches enable excellent efficiency under these conditions. LLC converter control is done in a traditional way with frequency and PFC synchronizes with this LLC frequency to maintain good power factor with duty cycle modulation. System has been simulated in PLECS. Hardware result is also shown.
A New Single Stage, Isolated, 3-phase AC/DC Converter
2019-12-01
2513232 byte
Conference paper
Electronic Resource
English
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