Time-domain-attribute

摘要 电能表作为用电量的测量工具广泛的应用于各种场合。在电能表校表系统中,需要的最基本的输入信号源是高精度双路正弦信号源,并要求可对其频率、相位、幅值进行调节,来对电能表进行校准。 基于单片机的程控信号源设计，运用数字调相、数字调幅和数字调频等技术，要求实现相位、幅度、频率的高精度程控调节。本文设计了一种利用锁相环频率合成技术和数字波形合成技术组成的程控低频正弦波信号发生器，并给出了调幅、调频、调相的实用电路，频率调节通过改变8253计数器的分频系数来实现；相位调节由51单片机预置计数器的计数初值来完成，幅度的调整通过改变DAC1210II的参考电压来实现，使频率分辨率达0.01Hz,相位调节精度达0.1°，并介绍电路中的主要芯的功能及使用。输出正弦波频率和幅值的精度高，稳定性好，失真度低，电路简单、可靠、便于程控。 关键词：数字合成信号源；程控；调幅；调频；移相； (Abstract Meter consumption as the size of the measurement tool is widely used in various occasions. In single-phase power meter verify system, the most basic needs of the input signal is the source of two-way high-precision sine signal source, and may request its frequency, phase, amplitude in a certain step to adjust to the imitate of the actual electricity load with a right meter calibration. Design of the programmable signal supply controlled source，which based on the MCU，including digital phase adjustment，distal amplitude adjustment，digital frequency adjustment etc．The system should achieve high quality digital adjustment of phase, amplitude and frequency. This paper describes the use of a PLL frequency synthesizer technology, and digital wave form synthesis technology consisting of program-controlled low-frequency sine wave signal issued devices, and applies the amplitude， frequency， phase of practical circuit. Frequency can be adjusted through a change in the 8253 counter-frequ)

virtools教程 初级程序 vt初级基础教学学习资料 (Virtools tutorial primary program vt primary basic teaching learning materials)

由直流输电引起的次同步振荡的阻尼特性分析 很好的论文(Caused by HVDC damping oscillation characteristics of a good thesis)

基于51单片机的AD7705的调试程序 经验证很好用 和大家一起分享(51 Microcontroller based debugger AD7705 with proven good to share with everyone)

实现MPU-925X陀螺仪的9轴数据融合进行互补滤波(Realize the MPU - 925 - x 9 axis of gyroscope data fusion of complementary filter)

汽车尾灯控制器，这是我第一次上在，没什么经验，以后努力(car taillight controller, this is my first time in, no experience, after efforts)

基于51单片机，12864液晶整屏滚动显示，动态显示(Based on 51 single-chip, full-screen scroll 12864 LCD display, dynamic display)

说明：  使用STM32+SIM800C，拨打电话、发送短信、透传和手机蓝牙控制等(Using STM32 + SIM800C, dialing, sending short messages, transmission and Bluetooth control of mobile phones, etc)

控制三相步进电机及光电编码器的采集,当电机停止时,保证三相里面只有一相相通,防止停止时电流过大.(Control three-phase stepper motor and optical encoder collection, when the motor stops to ensure that only one phase of three-phase inside the heart, and to prevent too much current is stopped.)

说明：  采用STM32F429单片机连接摄像头采集图像，并附源码(STM32F429 MCU is used to connect camera to collect image, and source code is attached.)