【经验】如何将簧片开关用作干簧继电器

时间： 2019-03-07 来源：Standex-Meder

技术问答

选型帮助

研发客服

商务客服

在干簧继电器中，簧片开关由电磁线圈激活，如图1是其简化示意图。干簧继电器需要相对较小的工作电源，一般由晶体管，TTL或者CMOS驱动。当开关处于干状态时（电流接近或小于5V@10mA）,继电器接触，进入工作状态。在自动化测试设备领域，干簧继电器每年可能要开关上千万次，这对于干簧继电器来说是个很大的挑战。

图1 干簧继电器示意图

使用合适的设计和材料，在干簧开关内部到线圈的周围布置静电屏蔽，通过继电器驱动屏蔽，允许耦合或者非常小的信号通路（纳伏级信号或者毫微微安级）同时保证非常小或者无干扰，如下图2.这事实上是使用其他技术是不可能的，除非不在意高昂的成本。

图2 干簧继电器线圈,簧片开关，屏蔽（同轴）布置图

使用同轴屏蔽，干簧继电器看起来像是高频信号的传输线。随着簧片开关越来越小，干簧继电器整体的封装也缩减到了8mm长，分布电容(开关到屏蔽层)也减小至0.8pF.如图3，干簧继电器的载频可以高达6GHz并且没有严重的信号强度损失（3dB）.典型的插入损耗低至0.2dB，在2GHz范围内1.1的电压驻波现在已经可以实现。干簧继电器的射频特性与砷化镓MOSFET相比在1G以上的频段更有价格优势。由于STANDEX-MEDER干簧继电器优越的RF特性，现在广泛应用于半导体测试设备和蜂窝通信设备。

图3 簧片开关贴在同轴屏蔽层可以提供优秀的GHz频段的RF特性

Standex-Meder在今天有大量的干簧继电器应用存在，并且数量每天都在增加。请查看Standex-Meder的应用部分以获取更多的细节应用

【选型】Standex-Meder（斯丹麦德）干簧继电器与传感器选型指南

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