Many system designers need an easy way to producea negative 3.3V power supply. In systems that alreadyhave a transformer, one option is to swap out the existingtransformer with one that has an additional secondarywinding. The problem with this solution is that manysystems now use transformers that are standard, offthe-shelf components, and most designers want toavoid replacing a standard, qualifi ed transformer with acustom version. An easier alternative is to produce thelow negative voltage rail by Stepping down an existingnegative rail. For example, if the system already employsan off-the-shelf transformer with two secondary windingsto produce ±12V, and a –3.3V rail is needed, a negativebuck converter can produce the –3.3V output from the–12V rail.
上传时间： 2013-10-09
上传用户：Jerry_Chow
提出一种基于凌阳单片机的步进电机加减速的控制方法。采用凌阳科技推出的16位结构工控单片机SPMC75F2413A为控制器，由Allegro公司生产的两相步进电机专用驱动器件SLA7042M构成步进电机的驱动电路，在传统的3段直线加减速控制算法基础上增加至7段S形曲线加减速过程，控制步进电机的启动和停止。实验结果表明，该控制方法克服了直线加减速中不连续、易造成系统冲击的问题，整个系统实现柔性控制，电机启动、停止连续性能提高30%。 Abstract: The method of controlled Stepping motor is referred based on SPMC75F2413A MCU， which adopts the 16 knots SPMC75F2413A MCU as the controller. The special-purpose actuation chip SLA7042M of two Stepping motor produced by Allegro Corporation constituted to actuation electric circuit. The purpose of increasing to seven section of S shape curve based on the traditional three sections of straight line is to control the start and stop process of Stepping motor. The experimental results show that the control method solves easy to pull-out and overshot problems. The overall system realizes flexible control， and the performance of motor start or stop continuity is increased 30%
上传时间： 2013-12-08
上传用户：jiangfire
The program md.f implements a simple molecular dynamics simulation in continuous real space. The velocity Verlet algorithm is used to implement the time Stepping. The force and energy computations are performed in parallel, as is the time integration. (The program uses some Fortran90 features, so an F90 compiler may be needed.)
标签： implements continuous simulation The
上传时间： 2016-04-03
上传用户：zhaiye
The main file in this list of programs is "vblast.m". Type "help vblast" on the command line for details.Study the coding by Stepping through the program. These programs require around 5000 packets for reasonable plotting accuracy.This has been implemented for a 2x2 system. The reader can program other variations. The program has been tested on MATLAB version 6.0 and above with signal processing toolbox and communication toolbox options.
标签： vblast programs command main
上传时间： 2016-08-24
上传用户：wcl168881111111
Communication software and platform develop sketch map and content and wrap up and step the computer network, such multi-platform information, in order to offer its explanation relying mainly on Stepping the platform of reference mainly as railway application,etc
标签： and Communication software platform
上传时间： 2016-10-28
上传用户：cooran
The 2D CFD Program NaSt2D The program is a 2D solver for the incompressible, transient Navier-Stokes equations including the temperature equation and free boundary problems. It uses finite differences for discretization on a structured equidistant staggered grid, central and upwind (donor-cell) discretization of the convective parts and an explicit time Stepping scheme. The free boundary value problems are treated with the MAC technique.
标签： incompressible Navier-Sto The transient
上传时间： 2013-11-30
上传用户：xfbs821
Asp.Net探针0.90源码（Asp.net2.0版） 探测信息如下： 服务器计算机名 http://localhost/ 服务器IP地址 127.0.0.1 服务器域名 localhost 服务器端口 80 服务器IIS版本 Microsoft-IIS/6.0 本文件所在文件夹 E:\downCode\ServerInfo\ 服务器操作系统 Microsoft Windows NT 5.2.3790 Service Pack 1 系统所在文件夹 C:\WINDOWS\system32 服务器脚本超时时间 30000秒 服务器的语言种类 Chinese (People s Republic of China) .NET Framework 版本 2.050727.42 服务器当前时间 2007-5-25 9:18:18 服务器IE版本 7.0000 服务器上次启动到现在已运行 51分钟 逻辑驱动器 A:\C:\D:\E:\F:\G:\H:\I:\ CPU 总数 2 CPU 类型 x86 Family 15 Model 3 Stepping 4, GenuineIntel 虚拟内存 61776M 当前程序占用内存 6.03M Asp.net所占内存 60.48M Asp.net所占CPU 4 当前Session数量 0 当前SessionID t4at4w45uh5pr455cq42gq55 当前系统用户名 NETWORK SERVICE 注意：当前版本只支持Asp.net2.0环境
上传时间： 2013-12-30
上传用户：evil
多功能智能遥控窗帘系统广泛地应用于家居、办公室等场合,同时也是智能家居的一部分。该设计主要利用STC89C52单片机核心电路、光敏电阻电路、步进电机电路、温湿度传感器、红外线控制电路、AD转换电路、LCD1602液晶显示屏等模块完成精确控制窗帘的开和关。multi-functional intelligent remote control curtain system is widely used in home,office and other occasions,and is also part of intelligent home.The design mainly uses STC89 C52 single-chip core circuit,photosensitive resistor circuit,Stepping motor circuit,temperature and humidity sensor,infrared control circuit,AD conversion circuit,LCD1602 LCD display and other modules to achieve accurate control of the curtain opening and closing.
上传时间： 2022-03-28
上传用户：
在传统智能小车驱动电路设计中,较多考虑使用直流电机还是步进电机,电机功率、能耗等性能参数。使用具有armCortexM4内核的STM32嵌入式平台控制四轮的4个直流电机。文章基于PWM技术及PID算法,对四轮进行精准地速度、转向及启停控制,实验表明此小车具有优越各种地形适应能力。In the traditional intelligent car drive circuit design,DC motor or Stepping motor,motor power,energy consumption and other performance parameters are considered.The four DC motors with four wheels are controlled by STM32 embedded platform with arm Cortex M4 kernel.Based on the PWM technology and PID algorithm,the accurate ground speed,steering,and start-stop control of the four wheels are carried out.The experiment shows that the vehicle has the superior adaptability to all kinds of terrains.
上传时间： 2022-04-02
上传用户：
