共查询到10条相似文献,搜索用时 78 毫秒
1.
镉镍蓄电池组快速充电探讨 总被引:2,自引:0,他引:2
快速充电是镉镍蓄电池的难点和热点问题。介绍了由10个单体串联组成的镉镍蓄电池组的快速充电实验方法和实践结果。实验结果表明,只要根据具体情况确定合适的充电电流,严格控制充电量和环境温度,保证散热良好,就能达到快速充电的目的。 相似文献
2.
3.
电动自行车用蓄电池的电性能在很大程度上受极板性能的影响,而极板性能在很大程度上又受极板化成充电制式的影响。极板化成充电制式不仅影响极板质量,还影响生产成本及能耗。根据作者多年的工作经验,总结出了一套行之有效的方法。 相似文献
4.
针对动力电池组三段式充电特性,设计了用于动力电池组充电的三相电流型PWM整流器的主电路,采用了电流空间矢量调制的间接电流控制策略和PI控制器实现网侧单位功率因数运行和直流侧电流稳定输出。为了避免传统电流矢量调制所需要的坐标轴系变换,给出了在三相静止坐标系下的电流矢量调制算法。在此基础上给出了由TMS320F2808芯片控制的电流型PWM充电器控制系统。详细介绍了PI控制器、三相电压调理电路及二/三值逻辑转换的设计方法。该装置省去了网侧电流检测,能在较宽范围内输出纹波较小的充电电流,动、静态性能良好。计算机仿真与动力电池组充电实验结果表明,所提设计方案是可行的。 相似文献
5.
The International Electrotechnical Commission (IEC) has prescribed an immunity test (IEC61000‐4‐2) of electronic equipment against electrostatic discharges (ESDs), in which a discharge current to be injected onto equipment under test is specified. As for the waveform, however, not the whole waveform but only the rise time, the first peak, and the current amplitudes at 30 and 60 ns are given in the time domain together with their uncertainties, which are required to check on the condition that an ESD generator (ESD‐gun) shall be arranged vertically to an IEC‐recommended calibration target and its earth return wire is kept away as far as possible from a vertical ground plane (IEC standard arrangement). In this study, to clarify how arrangements of an ESD‐gun and its earth return wire affect discharge currents, we measured discharge current waveforms for contact discharges of an ESD‐gun onto an IEC calibration target with respect to various inclinations of the ESD‐gun and arrangements of its earth return wire, and also calculated their current power spectra normalized to that of the discharge current for the IEC standard arrangement. As a result, we found that inclinations of the ESD gun affect the first peak current, which increases current power spectra by 14 dB at frequencies over 300 MHz, and that arrangements of the return wire influence the current waveforms between the first and second peaks, which provides variations in power spectra by ±12 dB in the frequency range from 10 MHz to 200 MHz. This finding suggests that arrangements of an ESD‐gun and its earth return wire are likely to cause different immunity test results. It was also found that in comparison with measured discharge currents for the standard arrangement, the calculated waveform of a discharge current from a formula, which has been included in the recent standard, has a more gentle falling waveform, and produces power spectra of +15 dB in the frequency range from 10 MHz to 200 MHz and –12 dB at frequencies over 300 MHz. © 2012 Wiley Periodicals, Inc. Electr Eng Jpn, 180(1): 9–14, 2012; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21270 相似文献
6.
7.
8.
小型VRLA电池分段恒流充电特性的研究 总被引:1,自引:1,他引:1
通过对电动自行车用小型阀控铅酸蓄电池(后称VRLA电池)特性的分析,研究了一种新的充电方式———分段恒流充电方式。通过对首段充电电流及充电电流段数进行的研究,结果表明:采用首段0 5C电流充电,四段或五段恒流充电,可使充电时间缩短到小于150min,同时电池的循环寿命达到大于250次,与"恒流—恒压—浮充"及"恒流—恒流—恒压"充电方式比较,分段恒流充电方式不仅充电时间短、循环寿命长、而且电池温升低、失水少。对电池性能衰减机理的研究表明:采用分段恒流充电能抑制VRLA电池正极板活性物质的软化和负极板活性物质的硫酸盐化。 相似文献
9.
电流回路变动过的线路保护须进行带负荷试验后才能投入运行.针对常规带负荷试验存在的耗时长、负荷不稳定、改接线风险性大的问题,提出了利用线路在空充状态下的电容电流进行带负荷试验的方法.首先分析了线路空充电流特性及其在带负荷试验中的适用性,给出了空充电流带负荷试验的适用范围.其次通过与常规带负荷试验进行对比,论证了所提出的带... 相似文献