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Title: Design of a single-stage inductive-power-transfer converter for efficient EV battery charging
Authors: Huang, ZC 
Wong, SC 
Tse, CK 
Keywords: Battery charger
Electric vehicles (EVs)
System efficiency
Wireless power transfer
Issue Date: 2017
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on vehicular technology, 2017, v. 66, no. 7, p. 5808-5821 How to cite?
Journal: IEEE transactions on vehicular technology 
Abstract: This paper studies wireless charging of lithium-ion batteries for electric vehicles. The charging profile mandates a constant-current (CC) charging for a discharged battery until the battery voltage reaches the cutoff voltage at rated power. The charging continues at the cutoff voltage with a constant-voltage (CV) charging at a power level down to 3% of the rated power in order to fully charge the battery. An inductive-power-transfer (IPT) converter should be designed with minimal number of stages to achieve high efficiency. However, high efficiency for such a wide load range is difficult to achieve. Moreover, the efficiency-to-load relationship is distinctly different for CC and CV charging operations, posing difficulties for the single-stage design. This paper describes the design of a single-stage IPT converter that complies with the battery charging profile and, at the same time, achieves optimal efficiency. Design optimization includes soft switching for the entire battery load range, efficiency optimization for CC and CV modes of operation, and system efficiency optimization for the whole battery charging profile. Measured results of two experimental IPT battery chargers are presented for illustration and verification.
ISSN: 0018-9545
EISSN: 1939-9359
DOI: 10.1109/TVT.2016.2631596
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