交交变频器余弦交截法微机实现方法研究

Study On Realization Of Cosine Wave Crossing Method in AC-AC Conve rter

介绍了交交变频器常用控制方法1:余弦交截法的基本原理,以及在控制系统中的微机实现方法,总结了两种余弦交截法的实现方式。方式1中重点说明了如何通过改进余弦交截法,快速实时近似求解触发时间常数。方式2介绍了三种常见的离线计算时间常数方法,并给出了触发程序框图。分析了两种方式的优缺点和各自应用范围。

Common control method of AC-AC converter, that is basic principle of cosine ware crossing method and realization of microcmputer in the control system are presented, two binds of realization of cosine waure cossing methods are summarized. In the first ways,how to improue cosine ware crnsing method and find approximate time constant in real- time are showed. In the secord way, three kinds of common off-line operation time constauts are presented and the chat of trigging program is giver. The advantages and disadvantages of the two woys and their eah scopes are analyzed.