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Equalization Charging and Protection System for Electric Vehicle
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作者 李红林 孙逢春 +1 位作者 张承宁 邵桂辛 《Journal of Beijing Institute of Technology》 EI CAS 2004年第S1期73-77,共5页
A system is developed to improve the series battery packs uniformities and charging protection and the implementation of battery equalization charging and protection system is also introduced. The functions of equaliz... A system is developed to improve the series battery packs uniformities and charging protection and the implementation of battery equalization charging and protection system is also introduced. The functions of equalization charging and overcharging protection are analyzed and the control model of series battery packs equalization charging is setup. The diverting-current and feedback bus voltage are measured during the series Li-ion battery packs equalization charging experiment. The field operation on Electric luxury transit bus BFC6100EV shows that the system betters the battery series charging uniformities and overcharging protection, improves the battery performance and extends the battery life. 展开更多
关键词 equalization charging: Li-ion batten series: battery series management: electric vehicle
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Half-plane diffraction of Gaussian beams carrying two vortices of equal charges
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作者 何德 高曾辉 吕百达 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第10期219-227,共9页
This paper derives explicit expressions for the propagation of Gaussian beams carrying two vortices of equal charges m = ±1diffracted at a half-plane screen, which enables the study of the dynamic evolution of vo... This paper derives explicit expressions for the propagation of Gaussian beams carrying two vortices of equal charges m = ±1diffracted at a half-plane screen, which enables the study of the dynamic evolution of vortices in the diffraction field. It shows that there may be no vortices, a pair or several pairs of vortices of opposite charges m -=±, -1 in the diffraction field. Pair creation, annihilation and motion of vortices may appear upon propagation. The off-axis distance additionally affects the evolutionary behaviour. In the process the total topological charge is equal to zero, which is unequal to that of the vortex beam at the source plane. A comparison with the free-space propagation of two vortices of equal charges and a further extension are made. 展开更多
关键词 two vortices of equal charges diffraction at a half-plane screen dynamic evolution
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