高介碳酸钡陶瓷沿面闪络伪火花开关的研究

为了满足脉冲功率技术和脉冲电流试验技术对放电开关的要求,笔者设计了BaTiO3高介电常数的电介质沿面闪络伪火花开关的触发装置。通过对表面放电触发器的实验发现:在伪火花开关的工作气压范围内,高介沿面闪络触发器显示出很强的电荷发射能力和快速的电荷注入能力,在气压为7 Pa时,触发器能够在30 ns内释放1.5μC,触发电流的上升陡度为1.2×1011A/s,发射的电子数达到9.4×1012。对自放电电压为28 kV的伪火花开关,可靠工作的最低电压可降低到130 V,放电时延为35～100 ns,最小抖动为6～25 ns。

BaTiO3 Dielectric Surface Flashover Triggering Device of Pseudospark Switch

In order to meet the requirements of the pulsed power technology and pulse test technology to the switchers,a triggered device of BaTiO3 high dielectric surface flashover pseudospark switch(PSS) was designed and its triggering characteristics were investigated.The test results indicate that the high-dielectric triggered device shows excellent electric performances of higher electron emitting capability and fast charge injection within the limits of adjusted parameters like gas pressure and applied voltage.At the pressure 7 Pa,the emitted charge is 1.5 μC within 30 nanosecond,the rise time of injection current is about ten nanosecond,the current injection rate reaches to 1.2×1011 A/s and the number of emitted electrons up to 9.4×1012,these make PSS have small delay time and delay jitter.For the hold-off voltage of PSS 28 kV,the lowest voltage of trigger switch drops to 130 V,the corresponding maximum discharging delay time and delay jitter are respectively 100 ns and 25 ns when the gas pressure is 7 Pa.The minimum discharging delay time and delay jitter are less than 35 ns and 6 ns,respectively when the switch voltage is 28 kV.