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所属单位：自动化学院

发表刊物：Conf Proc IEEE Appl Power Electron Conf Expo APEC

摘要：The LLC converters are widely used in the unidirectional chargers. However, the reverse LLC voltage gain is lower than unity. The DC-link voltage is then lower than the peak grid voltage so that the buck type DC-AC converters cannot be grid-tied directly, which causes the LLC reverse operation difficult in bidirectional charging applications. This paper proposed a SiC bidirectional LLC on-board charger architecture to achieve high efficiency and high power density. The first stage is an interleaved bridgeless totem pole PFC to achieve unity power factor. The second stage is a 300-kHz LLC taking advantage of wide ZVS range and magnetic integration. Thanks to extra control freedom of high DC-link voltage, the DC-DC voltage gain regulation burden is shared by the DC/AC stage taking advantage of high voltage SiC MOSFETs. An LLC reverse voltage gain compensation control by regulating DC-link voltage is proposed to enable the LLC bidirectional operation. A digital adaptive synchronous rectification driving scheme is proposed based on the LLC primary driver signals. The adaptive SR on-time is modified in every switching control cycle guaranteeing fast transient response and suitable for high frequency applications. A prototype of 6.6 kW SiC bidirectional LLC charger was built and the battery voltage from 240 V to 420 V. The power density is 44 W/in with 3 kW /kg and increases 22.2% over the Wolfspeed design. The charging peak efficiency is 95.3% through, and 1.3% higher than the state-of-the-art products. The peak discharging efficiency under 6.6 kW is 95.6%, and 0.6% higher than the state-of-the-art efficiency. © 2019 IEEE.

是否译文：否

发表时间：2019-05-24

合写作者：Li, Haoran,Wang, Shengdong,Tang, Jiacheng,任小永,陈乾宏

通讯作者：张之梁