一种改进的相控整流充电机

本文提出了一种为机车110V蓄电池养护而设计的新型充放电机。它采用在传统有源逆变电路基础上改进的可控硅整流电路,在主电路与负载之间用IGBT连接。当发生逆变颠覆等故障时,控制电路封锁脉冲。IGBT快速关断,断开主电路与负载。这种改进的电路为传统的相控整流电路提供了可靠的保护。文章从充电机的主电路的设计、控制系统的设计以及控制软件的设计等方面进行了介绍。     

Real-time measurement of submicron aerosol particles having a log-normal size distribution by simultaneously using unipolar diffusion charger and unipolar field charger

Recently, Park et al. [(2007). Development and performance test of a unipolar diffusion charger for real-time measurements of submicron aerosol particles having a log-normal size distribution. Journal of Aerosol Science, 38, 420–430] have introduced a methodology for performing simple and fast measurements of submicron aerosol particles having a log-normal size distribution, using a unipolar diffusion charger, an electrometer, and a condensation particle counter (CPC). The methodology can be applied to particles of 30–700 nm and requires an assumption of their geometric standard deviation in size. In this paper we propose a much cheaper but faster method which involves substituting a unipolar field charger and another electrometer for the CPC. With the data obtained using this dual-charger system, we developed a data inversion algorithm and estimated the particle size distribution by minimizing the differences between the measured aerosol currents and the calculated values. To compare the size distribution with the data measured using a scanning mobility particle sizer (SMPS), sodium chloride (NaCl) particles smaller than in diameter, and dioctyl sebacate (DOS) particles with a diameter of 0.1–, were used. The estimated results for the NaCl and DOS particles were within 10% of the data measured with the SMPS, while a 33% deviation from the SMPS results was obtained in Park et al. [(2007). Development and performance test of a unipolar diffusion charger for real-time measurements of submicron aerosol particles having a log-normal size distribution. Journal of Aerosol Science, 38, 420–430]. Furthermore, the detection time obtained with the use of our dual-charger system was faster () than the 5 s obtained by Park et al. [(2007). Development and performance test of a unipolar diffusion charger for real-time measurements of submicron aerosol particles having a log-normal size distribution. Journal of Aerosol Science, 38, 420–430].     

车载充电机功率因数校正电路分析与对比

针对电动汽车车载充电机的应用,选取了传统Boost PFC电路与交错并联Boost PFC电路进行设计与实验。实验结果表明:交错并联Boost PFC电路比传统Boost PFC电路功率因数高,纹波电流小,对器件要求低,更加适合大功率车载充电机的应用。     

劣质充电器对电能表的影响

通过对客户多次烧坏电能表原因的查找,发现劣质电动车铅酸蓄电池充电器的振荡电压和谐波电压致使客户表计电压有效值升高而导致表计烧坏.同时探讨了谐波污染的产生、危害和防治.     

立式注塑机预料液缸系统的改进

分析了KT—300型立式注塑机液缸顶料造成塑料螺杆变形的原因,并对液缸结构及液路控制系统进行了改进.     

ControlLogix在贵冶残极加料机中的应用

本文介绍了美国Ａ－Ｂ公司的ＣｏｎｔｒｏｌＬｏｇｉｘ在贵溪冶炼厂转炉残极加料机中的应用。分别描述了系统网络的配置、框架模块的配置、梯形图编制、人机画面，同时描述了ＣｏｎｔｒｏｌＬｏｇｉｘ与传统ＰＬＣ相比的不同点。