A serial port interface can be used to take control of the power supply , to set g1 , g2 and g3 voltages , to select the xrii field , or to measure back the real electrode voltages ( see chapter4 ) 一个串行端口接点可被用来控制电源,设定g1 ， g2和g3电压,选择x线影像增强器视野,或延迟测量实际极间电压(看第4章) 。
The distributed complicated automation system is adopted . the power supply for the control system is the microprocessor controlled dc power supply . it has the advantages of reasonable structure , multi - functions and easy installation 二次系统采用分布式综合自动化系统，控制电源采用微机直流电源，具有结构合理、功能齐全、现场安装调试方便等特点。
In order to resolve the problem of fast switching on or off , intellectual control and smaller bulk of high voltage power required in er valve , a nc high - voltage power source is designed and made using singlechip technology and high frequency switch power technology , 针对电流变阀对高压控制电源要求的快速通断及智能控制和体积小的特点，采用单片机技术与高频开关电源技术，设计制作了一台用于电流变阀控制的数控高压电源装置。
The development of dc control power system described in this paper is oriented to the baoji - chengdu electric railway - engineering project . a dc control power system , which is based on plc , hf switch rectifier and valve control seal battery is described in the paper 本文结合宝成复线电气化工程，针对牵引变电所直流控制电源系统设计，阐述了一个基于plc控制器、高频开关整流装置和阀控式密封铅酸蓄电池的直流屏的设计和产品研制。
According to the following design theory : the dsp calculates in real time and produces three phases spwm waves to control the on or off of the 6 igbts in ipm respectively . ipm then inverts the commutated single phase direct current ( insulated gate bipolar transistor ) into three phases alternating current . when modulated signals of spwm are changed , the on - off time of switches also changes , so as to the voltage and frequency of output signals 本文提出了一种基于dsp (数字信号处理器tms320f240 )的通用的三相间接变频电源系统，利用分段同步调制法和混合查表法，实时计算不同频率下的采样周期、电压幅值、输出脉宽，产生双极性spwm波形，经驱动放大后用于ipm ( intelligentpowermodule )中的绝缘栅双极型晶体管栅级驱动，以控制电源的输出电压和频率，实现变频电源的智能数字控制。
The designing and researching of dc control power system of a typical traction power substation such as system designing , hmi and program designing , elements choice , panel configuration etc . are carried out . automation control and management of the system are introduced in the paper as well as plc , touch screen and collecting , inspecting device 文章描述了典型牵引变电所直流控制电源的系统设计，产品构成，元器件选择等，同时对本系统以plc为核心的管理单元，工业触摸屏为人机界面，以及全方位的采集、检测设备进行了叙述，介绍了系统在自动化控制和管理方面的技术特点。
Firstly , the current testing localization in the detection of electric bow is analyzed and the new system ' s whole construction developed in this thesis is introduced ; in the 2rd chapter , the embedded 110v dc power supply is analyzed and constructed , and with experiments , some dissonant results such as the fluctuation of output pwm ( pulse width modulation ) pulses , the power noise added to output voltage , and the drop of output voltage have been analyzed and the problems have been broken down one by one ; in chapter 3 , stepping motor ' s drive has been systematically dissertated , and combing stepping motor ' s subdivided drive technology , the author develops an intelligent mini - step driving circuit using a main - sub microprocessor structure , which is validated in the hybrid stepper based system ; in the 4th chapter , liquid crystal driving and displaying technology is specified in detail , with one sort of lcd modules ( tlm12864h ) , the author develops an feasible circuit for the new testing system , designs a menu mode based program struc ture and brings here some programming codes using franklin c51 programming language ; in chapter 5 , the above built system is used in the electric bow ' s practical detection , and the differentiating rate of this system is analyzed 论文首先分析了目前机车受电弓检修方式存在的局限并概述了本论文研制的受电弓测试系统的体系架构；第二章对系统内置110v直流控制电源进行了分析和设计，结合试验对输出pwm振荡、输出电源噪声大、输出电压下跌等现象进行了分析并提出解决措施；第三章论述了步进电机的驱动，结合步进电机微步驱动技术研制了基于上下位单片机组的混合式步进电机智能驱动电路，并在试验中得以验证；第四章详述了液晶驱动及显示技术，利用一款液晶显示模块tlm12864h研制出本系统用液晶显示电路，设计了菜单式的程序结构并以franklinc51编程方式给出部分子程序代码；第五章则将以上构建的整个系统应用在机车受电弓的实测中，并对测试分辨率进行了分析。
If we can find a way to artificially enhance the adsorption of activated carbon , its benefits on economy and environment will be considerable . it is the aim of this work to investigate electrosorption of chloroform in water on granular activated carbon . the potentials on working electrode are controlled by potentiostat and the concentration of chloroform is measured by headspace gas chromatography 实验用恒电位仪作控制电源，调节工作电极电位(相对于参比电极电位)来控制加在活性炭上的电场，用顶空进样法测定水中氯仿的剩余浓度，参照方法与依据都是国家标准方法或国外先进方法。
For the teaching the hardware pwm inverter is designed , including the choice of power module , filter tache , auxiliary power supply , brake unit and protection circuits . in addition data sampling system is contrived with encoder and current / voltage sensors . the control circuit with tms320f240 for the core is presented at last . the circuit includes memory extension , d / a converter digital i / o interface and the interface of the serial port . the way of space vector pwm realization is briefly introduced in this paper 接着，设计了pwm电压型逆变器，其中包括主回路功率模块与滤波环节、控制电源、制动单元及保护电路设计。另外还利用霍尔元件与编码器设计出数据采集系统。最后，给出了基于tms320f240的最小系统，包括存储器扩展、串口扩展、数字i o接口以及空间矢量pwm的实现。
There are many kinds of power switches on the home hold electronic appliances and most of them don ’ t have remote control interfaces , but all of them are connected to the electrical outlets , if the outlets are controlled on and off in the distance , we can control the power supplies of the home hold electronic appliances , in order to eliminate the electronic appliance fire hidden troubles 家用电器的电源开关方式多种多样,而且大多数家用电器都不具备远程控制接口,但是所有的电器设备都是连接在电源插座上,如果能够远程控制电源插座的通断,就可以达到控制家用电器电源通断的目的,及时消除火灾隐患。
