电缆绝缘电阻测试仪中高压电源的设计  

Design of High-Voltage Power Supply of Cable Insulation Resistance Tester

作　　者：李琳琳[1] 王二宝 孙继银[1] 恒波 肖明芳[3] 

机构地区：[1]第二炮兵工程大学信息工程系 [2]第二炮兵装备部西安办事处驻航天四院军事代表室 [3]中国人民解放军96657部队

出　　处：《电测与仪表》2013年第5期101-104,119,共5页Electrical Measurement & Instrumentation

基　　金：军队重要科研基金资助项目(EP091045)

摘　　要：为满足电缆绝缘电阻测试"低电压输入,高电压输出"的需求,对有源钳位、脉宽调制和倍压整流等技术分析改进,提出一种新型的有源钳位倍压变换器。主回路中利用有源钳位技术实现磁芯磁通自动复位,提高了磁芯利用率,钳位电容与元器件产生谐振实现开关零压开通,减小开关损耗和电压应力;利用倍压技术降低变压器升压要求,减小了变换器体积;在控制回路中利用负反馈将输出电压输入脉宽调制芯片,控制脉冲占空比,提高了电源稳定性和负载特性。用软件仿真结果表明,该变换器能够为绝缘电阻测试提供稳定的高电压。To meet the power requirements of inputting low voltage and outputting high-voltage during cable insulation resistance test,the paper proposes a new type of active clamp voltage multiplying converters by analyzing and improving the technical of analysis active clamp pulse width modulation and voltage double rectifier.It uses main circuit in active clamp technique to achieve magnetic core flux automatic reset and increases core utilization.The clamp capacitor with other components produces resonant achieving opened switch to zero pressure,which reduces the switching loss and voltage stress.Doubling voltage technique is used to reduce transformer step-up requirements and converter bulk.Taking advantage of negative feedback in control loop,input output voltage into PWM chip and control pulse duty cycle can increase power stability and load characteristics.The software simulation result shows that the converter is able to provide a stable high insulation resistance test voltage.

关 键 词：脉宽调制 有源钳位 零压通断 倍压整流 负反馈 

分 类 号：TM935[电气工程—电力电子与电力传动] TN915.02[电子电信—通信与信息系统]