基于Intel8254的运动平台数/模转换电路设计

摘要

提出了一种新型的运动平台数/模转换(D/A)电路.利用可编程定时/计数器8254具有可编程单次脉冲、对主频进行分频等特点,设计了一种数/模转换电路.实际应用表明,这种数/模转换电路简单实用,工作稳定,且成本低、抗干扰能力较强、实时性好,已经成功地应用于某型飞行模拟器三自由度运动平台控制系统中.该电路还可推广应用于飞行模拟器的仪表控制系统、操纵负荷仿真系统的数/模转换电路中.%A new type of digital-to-analog(D/A) converting circuit of motion platform is proposed this paper. The digital-to-analog convenor (DAC) was designed by means of the programmable timer/counter 8254. It has characteristics of programmable single pulse and divided frequency for dominant frequency. The application shows that this kind circuit is simple, practical, stable and low cost, has stronger anti-interference ability and better real-time performance) and has been successfully applied to the control system of a flight simulator 3-DOF motion platform. This circuit can also be applied to the instrumentation control system of flight simulator and DAC of control loading simulation system.