引用第7楼black于2011-08-05 23:28发表的 :
隔直电容过大了 没有必要
补充Black版主的发言
源引GDT design中一段话：
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Primary AC Coupling
Brief discussion about the requirement for a capacitor in series with the primary of a GDT.
Capacitor Type and Size
A low loss capacitor, preferably a plastic foil or film type, is ideal for the coupling capacitor. The high peak currents means that a low ESR (equivalent series resistance) would be preferred, a characteristic of plastic film caps.
A value of 100nF to 1uF should be adequate for typical SSTC duty