模块化全固态高压ns脉冲开关技术

Solid-state High-voltage Nanosecond Switch Module

为满足脉冲功率技术所需高电压幅值、高重复频率脉冲源的要求,研究了一种新型绝缘栅双极晶体管(IGBT)串联技术,它用5个IGBT进行串联,并将控制、驱动、均压、缓冲电路和IGBT组成一体化模块结构,模块的体积小、重量轻。驱动信号经高频脉冲变压器耦合,可以同步驱动多个高电位的IGBT,输出脉冲的宽度和频率由单片机控制。经试验表明,100Ω的电阻负载时每个模块可输出前沿<100 ns、脉冲频率160 Hz^10 kHz、脉冲幅值约3.5 kV的可调脉冲电压,而且模块可以进行多个串并联。

A compact high voltage nanosecond pulser used for gap switch with a triggering electrode is produced. Instead of the traditional spark gap in the Marx generator, this pulse generator uses series-connected IGBTs as the switching component. A novel method using parallel pulse transformer to generate synchronal trigger pulses of series-connected IGBTs is studied. Meanwhile, snubber and voltage balance circuit of series-connected IGBTs is also studied. Fast recovered diodes are used for the protection of the IGBTs. A microcontroller system is used for generation of base control single. Pulse width and pulse frequency can be easily controlled by the mierocontroller. All of these parts are made into a module. Further studies have looked at the performance and operation of a switch emplo- ying five 1 kV IGBTs. Adjustable pulse of front duration less than 100 nanosecond and pulse frequency from 160 Hz to 10 kHz and maxim pulse amplitude 3.5 kV are generated when the load is a resistor of 100 Ω. If several modules are serially connected, higher level pulse can be generated.