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Wu C.,Chongqing University | Wu C.,China changAn Automotive Engineering Institute | Li X.,China changAn Automotive Engineering Institute | Zhang Q.,Chongqing University | Xu Z.,Chongqing University
International Journal of Electric and Hybrid Vehicles | Year: 2015

The direct current/direct current converter (DC/DC) is an important component in electric vehicles (EVs), and it is one of the main electromagnetic interference (EMI) sources in EVs. On the basis of EVs' platform of Chang'an automobile, DC/DC working principle and its EMI mechanism are researched, and characteristics of EMI noise generated in a DC/DC converter are investigated through experiments. Then controlling methods for conducted and radiated EMI noises produced by DC/DC are proposed. Results show that the DC/DC designed by electromagnetic compatibility (EMC) technology has good EMI noise performance, and can be good to satisfy the application requirement in EVs. © Copyright 2015 Inderscience Enterprises Ltd.


Li X.,China changAn Automotive Engineering Institute | Li X.,State Key Laboratory of Vehicle NVH and Safety Technology | Wang Z.,China changAn Automotive Engineering Institute | He J.,China changAn Automotive Engineering Institute | He J.,State Key Laboratory of Vehicle NVH and Safety Technology
International Journal of Electric and Hybrid Vehicles | Year: 2013

Wavelet Packet Transform (WPT) is employed to analyse the common mode (CM) current signal from the ignition system of a Hybrid Electric Vehicle (HEV). The CM current signal is decomposed into 16 subbands using WPT in the frequency domain. The integrated energy parameter of Wavelet Packet Coefficient (WPC) is extracted to describe electromagnetic interference (EMI) characteristics. The location of the main frequency zone for energy distribution was confirmed as the frequency band (62.5-70.3 MHz). When WPT is used, the obtained CM current spectrum has the same energy features compared with the spectrum derived using Fast Fourier Transform (FFT). The results accurately indicate that when WPT is used, the extracted integration energy parameter of WPC can also represent EMI characteristics. Copyright © 2013 Inderscience Enterprises Ltd.


Li X.,CAS Institute of Electrical Engineering | Li X.,China Changan Automotive Engineering Institute | Li X.,State Key Laboratory of Vehicle NVH and Safety Technology | Wang L.,CAS Institute of Electrical Engineering | And 2 more authors.
International Journal of Electric and Hybrid Vehicles | Year: 2013

The Battery Management System (BMS) is an important part of the Electric Vehicle (EV) energy management. It provides important parameters of the vehicle control strategy. However, BMS works in a complex electromagnetic environment of the electric vehicle, therefore improving the Electromagnetic Compatibility (EMC) performance of the BMS is extremely essential to guarantee the vehicle safety and reliability. The electromagnetic environment of a Hybrid Electric Vehicle (HEV) and its. coupling mechanism to the BMS is researched in this paper, and by the optimisation design the EMC performance of the BMS is greatly enhanced. Results show that the optimised BMS can be a good adaptation in the HEV complex electromagnetic environment. Copyright © 2013 Inderscience Enterprises Ltd.

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