Single-Stage LLC Charger with PFC Functionality and Wide Input Voltage Range

2019 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2019-03-17 DOI:10.1109/APEC.2019.8721966

M. Wattenberg, U. Schwalbe, M. Pfost

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引用次数: 7

Abstract

We present a compact battery charger topology for weight and cost sensitive applications with an average output current of 9 A targeted for 36 V batteries commonly found in electric bicycles. Instead of using a conventional boost converter with large DC-link capacitors, we accomplish PFC-functionality by shaping the charging current into a sin2-shape. In addition, a novel control scheme without input-current sensing is introduced. A-priori knowledge is used to implement a feed-forward control in combination with a closed-loop output current control to maintain the target current. The use of a full-bridge/half-bridge LLC converter enables operation in a wide input-voltage range.A fully featured prototype has been built with a peak output power of 1050 W. An average output power of 400 W was measured, resulting in a power density of 1.8 kW/dm3. At 9 A charging current, a power factor of 0.96 was measured and the efficiency exceeds 93% on average with passive rectification.The impact of pulse charging has been evaluated on a 400 Wh battery which was charged with the proposed converter as well as CC-CV-charging for reference. Both charging schemes show similar battery surface temperatures.

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具有PFC功能和宽输入电压范围的单级LLC充电器

我们提出了一种紧凑型电池充电器拓扑结构，适用于重量和成本敏感的应用，平均输出电流为9 a，针对电动自行车中常见的36v电池。我们没有使用带有大型直流电容的传统升压转换器，而是通过将充电电流塑造成sin2形状来实现pfc功能。此外，还提出了一种不需要输入电流传感的新型控制方案。利用先验知识实现前馈控制，并结合闭环输出电流控制来维持目标电流。使用全桥/半桥LLC转换器可以在宽输入电压范围内工作。一个功能齐全的原型已经建成，峰值输出功率为1050瓦。测量的平均输出功率为400 W，功率密度为1.8 kW/dm3。在充电电流为9 A时，测量到的功率因数为0.96，无源整流效率平均超过93%。以400 Wh电池为实验对象，对脉冲充电的影响进行了评估，并以cc - cv充电为参考。两种充电方案显示出相似的电池表面温度。

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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2019 IEEE Applied Power Electronics Conference and Exposition (APEC)

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