摘要
为满足高压脉冲电场灭菌实验的需要,提出一种结合经典Marx发生器与全固态开关器件的高压双极性方波脉冲源设计方案. 选用全固态开关器件替代传统的火花间隙开关,以单极性Marx发生器为核心,实现能量压缩,通过全桥固态调制器可实现高压方波脉冲的双极性输出. 详细分析了电路的结构、工作过程、控制策略和负载适应能力. 以全固态IGBT为主开关器件,研制了脉冲源的高压主回路部分;设计了相应的控制电路和开关同步触发电路,通过光纤和隔离供电模块实现了信号传输和强弱电的隔离. 相比于常规的双极性高压脉冲源,该方案具有更简洁的电路结构和良好的负载适应能力,实现了输出脉冲极性可控、前沿更陡,脉冲频率、脉宽、电压幅值可调等优点. 实验结果表明,该脉冲源系统可以产生幅值范围-7~7 kV、每秒脉冲数1~1 000、脉宽范围2~10μs、极性可变的高压方波脉冲,为开展高压脉冲电场灭菌实验,寻找最佳灭菌电参数条件,提供了硬件支持.
In order to meet the requirement of sterilization experiments under high-voltage pulsed electric field, a layout of high-voltage bipolar square pulser was proposed based on the combination of classical Marx generator and all-solid-state switching devices. The latter was chosen to take the place of spark gap switches and passive isolation elements. The core of high voltage pulser is the active charge-discharge Marx generator to realize the energy compression. In addition, the polarity alteration of output pulses was realized by a full bridge solid-state modulator. The pulser' s structure, working process, control strategy and the load adaptability were illustrated. In fact,in Marx generator IGBT was taken as switch devices to form main circuit. In addition, the switch situation of synchronous trigger circuit was decided by the control circuit through the optical fiber, and signal transmission and electrical isolation were realized by the contol circuit with isolated power supply modules. Compared with the conventional bipolar high voltage pulser, this cir-cuit has better performance such as simple structure,good load adaptability,control ability of output pulse polarity and steep pulse front. Moreover, it is feafured by the adjustability of output pulse' s frequency and width and voltage amplitude. The test data shows that this pulser can generate bipolar pulse. The amplitude ranges from-7 to 7 kV, pulse per second is from 1 to 1 000, and pulse width is from 2 to10μs. Therefore, it is competent for further research on sterilization experiments under high-voltage pulsed electric field.
出处
《电机与控制学报》
EI
CSCD
北大核心
2015年第9期73-80,共8页
Electric Machines and Control
基金
国家自然科学基金(51077139)
重庆市电器检测工程技术研究中心(cstc2011pt-gc70009)