零磁通霍尔电流传感器磁路仿真

在分析霍尔电流传感器磁路的基础上,推导出零磁通霍尔电流传感器的直流传递函数,并根据这个传递函数,运用ANSYS对该类传感器的磁路进行三维空间电磁场仿真,得到了磁场强度和磁感应强度矢量的仿真模型,与磁路模型和传感器电路模型的分析结果进行对比,该模型可用于闭环霍尔电流传感器对极向场电源系统±15kA双向直流大电流的检测.     

EAST装置变流系统脉冲功放电路的改进

介绍一种在大功率电源中为晶闸管提供触发信号的脉冲功率放大器.该放大器采用开关电源芯片提供直流电压,信号通路采用GO133进行光电隔离,然后经比较电路对信号进行整形.经过上述处理的输出信号具有稳定性强,隔离电压高的特点.文中结合电路原理图进行分析,最后给出实验波形.     

A new digital Gaussian pulse shaping algorithm based on bilinear transformation

Nuclear pulse signal needs to be transformed to a suitable pulse shape to remove noise and improve energy resolution of a nuclear spectrometry system. In this paper, a new digital Gaussian shaping method is proposed.According to Sallen-Key analog Gaussian shaping filter circuits, the system function of Sallen-Key analog Gaussian shaping filter is deduced on the basis of Kirchhoff laws. The system function of the digital Gaussian shaping filter based on bilinear transformation is deduced too. The expression of unit impulse response of the digital Gaussian shaping filter is obtained by inverse z-transform. The response of digital Gaussian shaping filter is deduced from convolution sum of the unit impulse response and the digital nuclear pulse signal. The simulation and experimental results show that the digital nuclear pulse has been transformed to a pulse with a pseudo-Gaussian, which confirms the feasibility of the new digital Gaussian pulse shaping algorithm based on bilinear transformation.     

结合电工电子课程教学谈备课

如何提高年轻教员的备课讲课能力，历来是抓好教学质量的重点。本文就如何提高教学效果，提出了作者在课前准备方面的一些看法。     

基于密码数据安全防护的机键接口电路研究

本文通过阐述LED数码管显示器接口技术、行列式键盘及其接口技术,实现在密码键盘上产生按一定顺序变化的随机数(LED显示),对密码起到保护作用。     

基于电感耐压实验装置的DSP控制系统设计

介绍了一种基于电感试验装置的DsP控制系统设计.该系统采用TMS320LF2407A为微处理器,利用DSP内部集成的数模转换器采集外部可变电阻上的分压,控制两路对称PWM波形的频率和占空比,两路PWM输出经过功率放大后控制IGBT逆变器的通断,从而在变压器上获得高频电压.实验结果表明,该系统具有迅速跟随外部输入信号变化,调整精度高的特点,很好的满足了系统实际的测试要求.