A new two-stage converter with reduction of DC-link capacitor for plug-in electric vehicle battery charger

2017 3rd International Conference on Computational Intelligence & Communication Technology (CICT) Pub Date : 2017-02-01 DOI:10.1109/CIACT.2017.7977338

A. Singh, M. Pathak, Y. S. Rao

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引用次数: 11

Abstract

The battery charger manufacturers want high power density with lower size and weight for on-board plug-in electric vehicles. But battery chargers with isolated converters is one of the major barriers for weight and power density. In addition, due to flow of second harmonic ripple in dc-link, a bulky dc-link capacitor is deployed at PFC stage, which has another cause of low power density in two stage battery charging. To deal with above aspects, this study presents a two-stage single-phase non-isolated converter for an onboard plug-in electric vehicles with sinusoidal charging battery method. The first stage is a conventional boost power factor correction (PFC) converter and the second stage is a proposed bidirectional dc/dc converter. In addition that, the second stage bidirectional dc/dc converter also has efficiency improvement compared to conventional two switches buck/ boost converter. The sinusoidal charging method of the battery allows to reduce the dc-link capacitor about 85–90% compared to conventional two-stage charging methods. The simulation results are shown to validate the proposed charger.

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一种新型两级变换器的直流电容减少插电式电动车充电器

电池充电器制造商希望为车载插电式电动汽车提供更小尺寸和更轻重量的高功率密度。但具有隔离转换器的电池充电器是重量和功率密度的主要障碍之一。此外，由于直流链路中二次谐波纹波的流动，在PFC级部署了体积庞大的直流电容，这是导致两级电池充电功率密度低的另一个原因。针对上述问题，本文提出了一种适用于车载插电式电动汽车正弦充电法的两级单相非隔离变换器。第一级是传统的升压功率因数校正(PFC)变换器，第二级是一种双向dc/dc变换器。此外，与传统的双开关降压/升压变换器相比，第二级双向dc/dc变换器的效率也有所提高。与传统的两段充电方法相比，该电池的正弦充电方法允许减少直流链路电容约85-90%。仿真结果验证了该充电器的有效性。

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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2017 3rd International Conference on Computational Intelligence & Communication Technology (CICT)

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