软件法扩展8951单片机D/A接口

8951 Soft D/A Technique

在一次PWM脉宽调制电路可输出模拟量的基础上 ,引进二次PWM的设计思路 从单片机数字量输出口输出的二次PWM信号经外围电路的滤波、放大和驱动 ,再驱动力加载装置 ,得到力幅、频率、脉宽三参量可程控的交变方波载荷力 介绍了二次PWM实现软件D/A的原理 ,同时也给出了软件实现的详细算法 该技术在最近开发的骨愈仪

The soft D/A interface design techniques which were applied to a kind of fracture healing instruments were presented.With this interface,based on PWM,the frequency,amplitude and the width of the output waves are all digitally adjustable.The principle and process were presented in detail as to how to implement this soft D/A.This soft D/A Technique has been successfully applied in fracture healing instruments recently.