摘要
准确可靠的触发技术是伪火花开关研究中的一项重要内容。因为触发方案的选择不仅关系到开关电极的结构设计 ,而且对开关的工作电压范围 ,频率和寿命有很大影响。本文首次采用半导体氧化锌 (ZnO)为材料 ,设计了伪火花开关的表面放电触发器 ,该触发器体积小 ,结构简单 ,可焙烧 ,大量实验 (>1 0 5次 )表明 ,其可靠性高 ,寿命长 ,用它触发的伪火花开关 (放电电压 30～ 2kV)具有稳定的放电时延 (80～ 4 0 0ns)和时延抖动 (2 0～ 5 0ns) ,由于触发电流大 ,因而可以在极低的开关电压下触发开关 ,对着火电压 30kV的伪火花开关 ,其最低可触发开关电压可至 4 40V。
Accurate and reliable triggering is one of the most important issues with high power pseudospark switches,for it not only has impact on the design of discharge chamber of switch,but also has influence on the dynamic range of operation voltage,repetition frequencies and lifetime of switch.The unique feature of pseudospark switch is its hollow cathode geometry.Hollow cathode produces hollow cathode effect,which provides switch with the protection for the triggering unit from erosion by high discharge plasma.In this paper,a ZnO surface flashover triggering is presented.This triggering unit possesses an excellent time delay (80～400ns) and jitter(20～50ns) at the switch voltage of 30～2kV.The emitted plasma electron density is high enough to trigger switch reliably down to switch voltage of 440V.
出处
《电工技术学报》
EI
CSCD
北大核心
2003年第4期46-50,共5页
Transactions of China Electrotechnical Society
基金
国家自然科学基金重点资助项目 ( 10 0 3 5 0 2 0 )
