【经验】GDT放电管与MOV压敏电阻串联使用时是否导通在前？

时间： 2022-12-04 来源：优恩半导体官网

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在开关电源中，大家都知道GDT——陶瓷气体放电管通过是与MOV压敏电阻串联使用。那你知道他们之间谁先导通吗?

一般情况下大家都只了解到它们是在共模雷击时起到抑制雷击浪涌电压的一个作用，关于它们之间哪个先导通的问题都没人去深究，优恩半导体认为，要想知道GDT陶瓷气体放电管与压敏电阻哪个先导通，首先得了解它们的特性。

一、GDT放电管

GDT放电管一般采用陶瓷作为密封原料。它可以看成是一个电容很小的对称开关，正常工作状态下是关闭的，其极间电阻在兆欧级以上。其作用是限制浪涌电压，保护电路免受过压的损害。

GDT陶瓷气体放电管的参数：

1)反应时间是指从外加电压超过击穿电压到出现击穿的时间。GDT放电管的反应时间一般以微秒为单位。

2)允许功率负荷是指陶瓷气体放电管能够承受和耗散的较大能量，一般是8/20μs电流波形下能够承受及耗散的电流。

3)电容值是说在特定波形下(一般在1MHz频率)测得的GDT放电管两个电极之间的电容。GDT电管的电容很小，一般是≤1pF。

4)直流击穿电压是在陶瓷气体放电管上施加100V/s的直流电压时的击穿电压值。放电管产生火花时的电压即为击穿电压。气体放电管有多种不同规格的直流击穿电压，优恩半导体有最高5500V、最低70V的。其误差范围：一般为±20%，也有的为±15%。其值取决于气体种类和电极间距等因素。

二、MOV压敏电阻

通过对比分析可知，压敏电阻的电容在1kHz时为210pF，而GDT放电管在1MHz频率时的电容为1-2pF。

如果在两端加上雷击浪涌电压，放电管和压敏电阻之间的电压就会除以寄生电容。GDT放电管与压敏电阻两个器件串联时，通常小容量的分压较高，大容量的分压较小，MOV压敏电阻的寄生电容是陶瓷气体放电管的百倍，因此绝大部分的电压会给到放电管，放电管导通之后，再施加到压敏电阻上，此时压敏电阻就会导通。在这种MOV压敏电阻和GDT放电管串联使用的电路应用中，响应时间是放电管和压敏电阻响应的总和。

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本文由玉鹤甘茗转载自优恩半导体官网，原文标题为:GDT放电管与其他元件串联时是否导通在前？，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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