PLC内部资源开发的探讨

利用PLC内部富余资源 ,实现对PLC外部输入控制电器的短路和开路故障检测。探讨了设计思路 ,给出了实际控制电器短路和开路故障的检测梯形图     

一种低压工作的开关电流Σ-Δ调制器

基于全差分开关电流存储单元,设计了一种二阶开关电流Σ-Δ调制器。采用标准0.18μm数字CMOS工艺,在spectre仿真器下进行优化仿真。实验表明,调制器在1.8 V工作电压、5 MHz采样频率、125倍过采样率下,输出波形与Matlab下的行为仿真波形接近,具备调制功能并达到12 bit分辨率。与类似研究相比,本设计在相当的分辨率条件下,实现了低电压工作。     

改进溢出判断电路的设计与仿真研究

传统数字芯片电路中,固定字长有符号数的加法或减法运算的溢出判断需要等到加法/减法运算结束之后才能进行。以四位有符号数加法/减法运算溢出判断逻辑为例提出一种改进的设计方式,能够在加法/减法运算结束之前对操作数进行判断,从而决定是否有溢出现象的发生。仿真发现,改进后的电路无论在规模上还是在运算速度上都有很大改善。     

A wind-flutter energy converter for powering wireless sensors

This paper describes a low-speed wind energy harvesting system that transfers aerodynamically induced flutter energy into electrical energy. A random airflow generates mechanical vibrations due to the fluid-structure interaction between a flexible belt and the airflow. An electromagnetic resonator with copper coils and a permanent magnet is designed to efficiently harvest electrical energy from the induced mechanical vibrations. Different groups of springs are compared at various wind conditions to maximize the power output. Typically ∼7 mW of electrical energy can be obtained at ∼3 m/s wind speed with a 1 m long belt. A power conditioning circuit with a charge pump and a DC-DC converter is used to convert the generated voltage into a stable 3.3 V DC for consumption. It is demonstrated that this generator can be used to drive a commercial wireless temperature sensor.     

RK–Butcher algorithms for singular system-based electronic circuit

In this paper, a new method of analysis for a singular system-based electronic circuits using the Runge–Kutta (RK)–Butcher algorithm is presented for linear time-invariant and time-varying cases. The discrete solutions obtained using the RK–Butcher algorithms are compared with the exact solutions of the electronic circuit problem and are found to be very accurate. Stability regions for the Single term walsh series method and the RK–Butcher algorithms are presented. Error graphs for inductor currents and capacitor voltages are presented in a graphical form to show the efficiency of this method. This RK–Butcher algorithm can be easily implemented in a digital computer and the solution can be obtained for any length of time.     

关于电力电子技术教学中MAtlAb/Simulink的应用研究

介绍MAtlAb/Simulink仿真软件的功能和仿真过程.以三相桥式全控整流电路为例,进行建模和仿真分析,并用于教学中.     

双余度舵系统设计与研究

为了提高舵系统可靠性,采用了冗余策略,设计了双余度舵系统.选用双余度永磁无刷直流电机作为舵机本体,采用均流技术等控制策略,实现系统软硬件设计.利用Matlab/Simulink,对双余度无刷直流电机本体和舵系统整体进行仿真验证.仿真结果和实验结果表明,该设计实现了对角度的高精度跟踪,整个系统稳态误差小、性能优良.