用于液体食品灭菌的双极性方波脉冲电源  

A Bipolar Square-Wave Pulsed Power Supply for Sterilization of Liquid Food

作　　者：朱博 马成勇 吴国延 苏贺 魏新劳[1] Zhu Bo;Ma Chengyong;Wu Guoyan;Su He;Wei Xinlao(Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education,Harbin University of Science and Technology,Harbin 150080,China;Huaneng Guanyun Clean Energy Power Generation Co.Ltd,Lianyungang 222228,China)

机构地区：[1]哈尔滨理工大学工程电介质及其应用教育部重点实验室,哈尔滨150080 [2]华能灌云清洁能源发电有限责任公司,连云港222228

出　　处：《电工技术学报》2024年第16期5121-5133,共13页Transactions of China Electrotechnical Society

摘　　要：为了满足高压脉冲电场(PEF)液体食品灭菌对脉冲电源的特殊要求,该文首先基于传统Marx电路提出了新的拓扑结构,以减少半导体开关的使用数量,设计了用于多样性负载残余电荷的放电回路,通过对双极性脉冲电路中半导体开关导通时序的控制,实现对双极性脉冲波形的陡化,并基于此设计搭建出可供液体食品灭菌实验用的双极性方波脉冲电源;其次,利用OrCAD仿真软件对电路进行可行性分析,验证了电源在阻容性负载下输出波形依然是方波,以及电路的钳位功能;最后,设计并搭建了3级双极性方波脉冲电源的实验样机。测试结果表明,双极性脉冲电源实现了±6 kV、50~500 Hz的高压脉冲输出,输出脉冲宽度达2~20µs,正、负极性脉冲上升沿与下降沿在300ns内。通过设计回路对负载及时放电,显著陡化了脉冲拖尾,具有良好的负载适应性。利用搭建的双极性方波脉冲电源灭菌实验平台对生鸡蛋清进行灭菌实验,结果表明,提高双极性方波脉冲输出的电压幅值、频率和宽度均可以增强对液体食品的灭菌效果,且脉冲电压幅值的提高对灭菌效果的提升更加显著,但脉冲电压幅值、频率和脉冲宽度的提高均会使液体食品温度升高从而导致异常放电,因此需要合理地调控三个参数来控制液体食品的温升以获得更好的灭菌效果。该文可为双极性方波脉冲液体灭菌技术提供理论和技术支持。Pulsed electric fields(PEF)sterilization technology has the advantages of low energy consumption,short sterilization time,high efficiency,and low processing temperature.The high-voltage pulsed electric field acts on the biofilm of the cell to form a transmembrane voltage.When the trans-mode voltage exceeds a certain critical value,cells rupture and ultimately die completely.The sterilization technology has a small temperature rise and can maximize the retention of food nutrition and flavor taste.This non-thermal sterilization technology has received extensive attention.At present,the bipolar pulse power supply solves the tailing phenomenon in the sterilization of liquid food by means of discharge circuit and controlling the conduction time of solid state switch,but the tailing phenomenon still exists,which will cause the temperature of the treated liquid to rise,damage food nutrition,affect taste,and lead to the abnormal discharge of the treated liquid.A new topology structure based on Marx circuit is proposed.This topology reduces the number of semiconductor switches used.A discharge circuit for residual charges of diverse loads is designed.The working process of the new topology circuit is introduced in detail.Combined with the control of the conduction sequence of the semiconductor switch in the bipolar pulse circuit,the output of the bipolar square wave pulse is realized.The feasibility analysis of the three-stage bipolar square wave pulse circuit is carried out by using OrCAD simulation software.It is verified by simulation that the output waveform of the power supply is still a square wave under the resistance-capacitance load,which realizes the steepening of the bipolar square wave pulse waveform.At the same time,it is verified that the circuit has clamping function.The experimental prototype of a three-stage bipolar square wave pulse power supply is designed and built.The performance index of the pulse power supply prototype and the selection of the main components are given.The solid-state switch uses AB

关 键 词：高压脉冲电场 脉冲灭菌 双极性方波 MARX电路 

分 类 号：TM832[电气工程—高电压与绝缘技术]