基于74HC4046新型频率跟踪电路的研究  

Study on New Frequency-tracking Circuit Based on 74HC4046

作　　者：车保川[1] 屈百达[1] 

机构地区：[1]江南大学通信与控制工程学院,江苏无锡214122

出　　处：《现代电子技术》2008年第3期188-190,共3页Modern Electronics Technique

摘　　要：频率跟踪是超声波电源的一个重要特性。讨论了超声波清洗机中自动频率跟踪的必要性,在介绍超声波清洗机的主电路原理、PLL锁相环原理的基础上,利用单片机检测超声电源负载的电流、电压的相位差,从而改变74HC4046的输出频率,完成了变步长频率跟踪软件设计。结果表明,该系统具有很好的频率跟踪性能。Frequency tracking is an important characteristic of ultrasonic power. In this paper, the necessity of frequency tracking in ultrasonic cleaning equipmens is discussed. Based on introduction on the principle of the mian circuit of the ultrasonic power supply for cleaning equipmens and the principle of PLL,the output frequency of 74HC4046 is changed by a single chip measuring the phase difference between volage and current. The software of adaptive tracking technique with varied frequency steps is completed. Fast and exact frequency tracking is realized.

关 键 词：超声波电源 锁相环 频率跟踪 74HC4046 变步长 

分 类 号：TB553[理学—物理]