脉冲电场灭菌用固态高压开关的研制

针对脉冲电场灭菌技术对开关性能的特殊要求,提出了利用IGBT串联构成高压、大容量固态开关的技术。设计并实际制造出了可供高压脉冲电场灭菌用额定电压10 k V的固态高压开关。该开关采用8个1 700 V、400 A的IGBT串联,以栅极动态RCD为基本均压方式,以FPGA为主控单元,产生8路相对独立的基准控制脉冲,其脉宽、周期、延时均可调节,且以25 ns为步进调节。通过调节各路驱动信号的相对延时,使各单元分压均匀,消除过压影响,从而在负载端得到较为理想的方波脉冲。采用光纤隔离,使隔离电压不受限制。实验结果表明,该装置性能良好,可以满足脉冲电场灭菌的实际需求。

Development of solid-state high voltage switch for high-voltage pulsed electric field sterilization

Aiming at the special requirements of pulsed electric field sterilization technology to the per-formance of the switch ,the technology that constitutes the solid-state switch of high voltage and large ca-pacity by using IGBT series connection was presented .The solid-state high voltage switch for high-voltage pulsed electric field sterilization was designed and actually manufactured ,and its rated voltage is 10 kV. Eight 1700 V、400 A IGBTs series connection was adopted in the switch and gate dynamic RCD was taken as the basic voltage-balancing way .FPGA was used as the main control unit ,which generates eight rela-tively independent of the inference control pulses ,and its pulse width ,cycle,delay time can all be adjus-ted.25 ns was taken as the step adjustment .By adjusting the relative delay of each drive signal ,equal voltage was got in each unit ,over-voltage effects was eliminated ,so as to get ideal square-wave pulse on the load side .By using optical fiber isolation ,the isolation voltage is not restricted .The experimental re-sults show that the device has good performance and meets the actual demand of high -voltage pulsed elec-tric field sterilization .