直流斩波器的失控保护

The Out-of-control Protection of A DC Chopper

直流斩波器失控是斩波调速系统中常遇到的一个重要问题,如何对斩波器失控进行合理有效的保护是一个有待深入研究的课题,本文先讨论了直流斩波器失控的一般问题,接着介绍了应用主晶闸管导通时间为信号的失控保护及换流能量不足引起失控时的保护。

The out-of-control protection of dc chopper is an important pro-blem frequenty met in the chopping speed-regulating system.How to resonably and efficiently protect a dc chopper from getting out of control is a subject which remains to be further studied.This paper first discusses the general out-of-control problems of a dc chopper, and then introduces the out-of-eontrol protection that uses the turn-on time of the main thyristor as signal and the protection against the out-of-control caused by insufficient transfer-current energy.Finally the paper introduces a distingu-ishing circuit of out-of-control protection of a chopper which makes use of the current-instantaneons-value control, which is developed recently by the author himself.