Entwurf von Flüssigkeitsbehältern

Design of Liquid Retaining Structures – Remarks on the Rules of the Guideline “Watertight Concrete” The use of watertight concrete structures is regulated by the guideline “Watertight Concrete” of the German Committee of Reinforced Concrete, especially requirements on the serviceability limit states. The scope of the guideline is valid for liquid retaining structures too. The essential characteristic of those structures is their defined tightness. Design concepts in order to fullfill requirements on durability of concrete tanks are discussed. Moreover, recommendations due to the design of moderate prestressed reinforced concrete tanks are given, containing the durable filling of planned cracks. Design aspects of the European Standard EC 2 Part 3 are discussed too.     

高频开关电源有源EMI滤波器应用研究

以反激式开关电源为研究平台,详细分析了开关电源中电磁干扰的问题,尤其是共模传导电磁干扰。重点研究基于运算放大器的有源共模传导EMI的抑制方法,并比较采用有源共模EMI滤波器和不采用有源共模EMI滤波器的实验原理及EMI水平。实验证明了该有源EMI滤波器工作稳定,滤波效果良好。     

低功耗电磁水表的信号处理方法

提出了一种低功耗电磁水表的信号处理方法,该方法不需要DSP(数字信号处理器)或高端的MCU平台,其电路主要结构旋转电容滤波器基于相敏检测技术,可以用通用运放、模拟开关及一般RC元件等器件组成,具有中心频率稳定、电路简单、成本低廉等优点。该方法可以从强宽带背景噪声中提取微弱信号,非常适合电磁水表信号的处理。通过比较滤波前后的信号频谱成分,验证了自举电路和旋转电容滤波器组合的方法的有效性。