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zhiliudianliuyuan
本系统以直流电流源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电流，设置步进等级可达1mA，并可由数码管显示实际输出电流值和电流设定值。本系统由单片机程控输出数字信号，经过D/A转换器（AD7543）输出模拟量，再经过运算放大器隔离放大，控制输出功率管的基极，随着功率管基极电压的变化而输出不同的电流。单片机系统还兼顾对恒流源进行实时监控，输出电流经过电流/电压转变后，通过A/D转换芯片，实时把模拟量转化为数据量，再经单片机分析处理， 通过数据形式的反馈环节，使电流更加稳定，这样构成稳定的压控电流源。实际测试结果表明，本系统输出电流稳定，不随负载和环境温度变化，并具有很高的精度，输出电流误差范围±5mA，输出电流可在20mA~2000mA范围内任意设定，因而可实际应用于需要高稳定度小功率恒流源的领域。(the system to DC current source to the core, MCU AT89S52 main controller, through the keyboard to set up DC power supply output current, set up to 1mA Stepping grades, digital control can be shown by the actual output current value and current setting. The system consists of programmable microcontroller digital signal output, after the D/A converters (AD7543) analog output. After Operational Amplifiers isolation, amplification and control of the output power base. With the power of the base voltage changes in the output current. SCM system also takes on the constant current source for real-time monitoring, after current output current/voltage changes, the A/D converter chip, real-time conversion from analog to the volume of data and then analyzed by the MCU, through data link in the )
- 2006-06-27 08:41:38下载
- 积分：1
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51_gprs
51单片机片上串口控制GPRS模块。用KEIL 软件调试成功。(51 MCU on-chip serial port to control the GPRS module. KEIL software debugging success.)
- 2012-06-21 11:26:24下载
- 积分：1
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AVR1628
AVR编写1628的C程序AVR编写1628的C程序(AVR C program written 1628 AVR C program written 1628)
- 2013-03-09 11:28:36下载
- 积分：1
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12864display
多级菜单通过1284显示！并由矩阵键盘控制(Multi-level menu through 1284 show! By Matrix keyboard control)
- 2013-11-01 11:06:30下载
- 积分：1
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基于W5500 的IAP
基于STM32单片机，通过W5500以太网芯片下载APP的IAP程序，实测正常使用。(Based on the STM32 microcontroller, download the APP IAP program through the W5500 Ethernet chip, and measure the normal usage.)
- 2021-03-26 10:49:13下载
- 积分：1
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333
基于分时电价的电动汽车有序充电控制策略设计(TOU-based electric vehicle charging control strategy design and orderly)
- 2014-04-01 18:26:24下载
- 积分：1
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grain-dryers
我的毕业设计，基于PLC的粮食烘干机，实现了粮食的自动烘干(I graduated the design, based on the PLC of grain dryers, implements the automatic drying of food)
- 2015-03-29 21:11:52下载
- 积分：1
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Wiegand_led
wiegand protocol. C++ project.Leds for Attiny
- 2012-01-27 04:20:37下载
- 积分：1
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pq
说明： 用PSCAD软件编写的典型的分布式发电机PQ控制(PQ control of the distributed generators)
- 2012-05-12 16:50:49下载
- 积分：1
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Reachability
iOS 网络状态监测。网络实时检测，用到Reachability（自行下载）,需加框架:SystemConfiguration.framework
ios程序需要用到网络检测，有些程序是刚启动时检测一次，而有些则从头到尾检测网络状态。(IOS network status monitoring.Real-time detection and Reachability (download), frame: SystemConfiguration.framework
IOS programs need to use network detection, some detection once when the program is launched, while others detect the network status start to finish.)
- 2015-02-20 12:33:27下载
- 积分：1
