【应用】国产RS-485总线电路的防护用于新能源领域，达到接触静电±8KV，浪涌±5KA/±10KV

时间： 2022-07-05 来源：硕凯电子

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随着“碳中和”概念普及，光伏、风力、储能等行业再度迎来风口。而作为这些行业的常用通讯接口，RS-485往往需要添加保护电路来保障通讯稳定。RS-485总线在应用中需要添加外围保护电路来抵御高等级的静电或浪涌带来的影响，保障自身通讯稳定。一般的RS-485的防护方案通常会使用气体放电管和TVS管搭建防护电路，该电路的结电容较高，当总线上的节点数较多，总线的电容量较大，会对总线波形造成干扰，影响通信信号质量，因此为减小保护电路对总线通信的影响，硕凯推出一种低结电容的外围电路设计方案。

如图所示的保护电路，气体放电管将接口处的大部分浪涌电流泄放，采用TSS进一步降低气体放电管后的残压，从而保护后级电路。该保护电路可以达到接触静电±8KV，浪涌±5KA/±10KV，满足大部分工业现场对RS-485节点静电和浪涌等级的要求。

该防护电路使用的防护器件的参数如下：

陶瓷气体放电管（GDT）

自恢复保险丝（PPTC）

半导体放电管（TSS）

硕凯电子是一家专注于过压过流防护器件的公司，包括有陶瓷气体放电管、玻璃放电管、半导体放电管、瞬态抑制二极管、ESD静电抑制器、压敏电阻、自恢复保险丝、NTC热敏电阻等防护器件。

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本文由梁楚瑜转载自硕凯电子，原文标题为:新能源领域的RS-485总线电路的防护介绍，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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