Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 11, Pages 13730-13742Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2022.3180226
Keywords
Electric vehicle (EV) charging; high efficiency; LLC resonant converter; soft switching
Categories
Funding
- Australian Research Council [DE210100473]
- Australian Research Council [DE210100473] Funding Source: Australian Research Council
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This article proposes a new method for EV charging applications based on the capacitor-clamped LLC converter topology and fixed-frequency PS modulation. Compared with traditional methods, it achieves a smaller phase shift variation range, lower turn-OFF current, and wider soft switching range, resulting in higher efficiency.
LLC resonant converter has been widely employed in electric vehicle (EV) charging applications. However, conventional frequency-modulated LLC converters generally demand a wide frequency variation range and are difficult to scale up, while the traditional phase-shifted (PS) LLC converters have the issues of ease of losing soft-switching condition and high turn-OFF current. In response to these challenges, this article proposes a new method for EV charging applications based on the capacitor-clamped LLC converter topology and fixed-frequency PS modulation. Compared with traditional PS LLC converters, the proposed method can achieve 1) smaller phase shift variation range, 2) lower turn-OFF current, and 3) wider soft switching range, resulting in higher efficiency. An 825-W prototype with 200 V input and 125-210 V output range verified the features of the proposed idea, and the efficiency reaches 97.82% at the maximum output power.
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