Analysis of Overcurrent Protection for Topology Morphing LLC Converters by Diode Clamping applicable to EV chargers

2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia) Pub Date : 2023-05-22 DOI:10.23919/ICPE2023-ECCEAsia54778.2023.10213670

Jiho. Kwak, Ki-Bum Park, I. Jang

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Abstract

Recently, EVs (Electric Vehicles) increased their pack voltage from 400V to 800V. It has shortened the charging time, but EVs with 800V now have to carry an extra boost converter with their OBCs (onboard chargers) since most fast chargers support only 400V systems. This consumes extra weight and volume from EVs. Therefore, chargers need to handle both 400V and 800V systems to make EVs more competitive in the market. However, the chargers’ efficiency will decrease due to the broader expected output voltage range. As a solution, this paper suggests a Topology morphing technique. Nonetheless, the main scope of this paper is the overcurrent protection of such applications since there isn’t much research about overcurrent protection schemes for topology morphing. This paper proposes diode clamping of a resonant capacitor in a capacitor-shared LLC converter applicable to EV chargers for overcurrent protection with simulation results.

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适用于电动汽车充电器的二极管箝位拓扑变形LLC变换器过流保护分析

最近，电动汽车(ev)将其电池组电压从400V提高到800V。它缩短了充电时间，但800V的电动汽车现在必须携带一个额外的升压转换器和车载充电器，因为大多数快速充电器只支持400V系统。这消耗了电动汽车额外的重量和体积。因此，充电器需要同时处理400V和800V系统，以使电动汽车在市场上更具竞争力。然而，充电器的效率将下降，由于更广泛的预期输出电压范围。为了解决这个问题，本文提出了一种拓扑变形技术。然而，由于对拓扑变形的过流保护方案的研究并不多，本文的主要研究范围是此类应用的过流保护。本文提出了一种适用于电动汽车充电器过流保护的电容共享LLC变换器中谐振电容的二极管箝位方法，并给出了仿真结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2023 11th International Conference on Power Electronics and ECCE Asia (ICPE 2023 - ECCE Asia)

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