PMT校频技术在航标灯设计中的应用

Application of PMT Technique in Pharos Design

在航标灯应用研究中,为解决ATmega8L单片机在工作电压上升过程中,系统频率不稳定的问题,提出一种基于单片机电源管理技术(PWM)的校频方法。针对航标灯工作环境光照度变化缓慢的特点,提出过渡时间TINT的概念。利用AVR单片机PMT的空闲模式,结合看门狗唤醒功能,在不改动电路的前提下,实现了单片机系统时钟自动校频的功能。

In the design of pharos,in order to resolve the problem of frequency shaking during the process of rising of working voltage,a new method based on PMT technique is proposed.According to the feature of intensity of illumination in the environment of pharos,the concept of transit time（TINT） is issued.Without any changing of electric circuit,the function of auto frequency adjustment is enforced using the idle mode of ATmega8L based on PMT（power manage technique） and the waking up skill of watchdog.