宽带压控带阻滤波器分析

Analysis of the Broadband Voltage Controlled Band-stop Filter

在继电保护通讯中,通讯信号在传输过程中通常会受到外部某一宽频段信号的干扰。特别是在载波通讯方面,其严重影响了通讯质量以及继电保护装置动作。但传统的窄带阻滤波器的衰减范围过小,无法达到衰减此宽频段干扰信号的理想效果。而一种宽带压控型带阻滤波器能够满足这一要求,同时具有电路性能稳定、增益便于调节的优点。因此,分析这种压控型宽带阻滤波器,研究其输入与输出电压波形、幅频特性和相频特性,并扩展实例应用,证明其具有一定的现实意义。

In the relay communications, communication signals in the transmission process are often disturbed by outside a wide band signal, seriously affecting the communication quality and operation of protection devices par- ticularly in the carrier communications. However, traditional narrow band stop filters （including notch filter） have such a limited attenuation range that ideal effect of interference signal attenuation cannot be achieved in this band. A wideband voltage-controlled band-stop filter can meet this requirement, and the voltage control circuit has the advan- tages of stable performance and easily adjustable gain. The input and output amplitude frequency characteristics of voltage-controlled band-stop filter are analyzed and its extended applications are introduced.