ITECH双脉冲测试平台搭建方案

[{"attributes":{"color":"#000000"},"insert":"双脉冲测试(Double Pulse Test)是分析功率开关器件动态特性的常用测试，通过双脉冲测试可以便捷的评估功率器件的性能，获得稳态和动态过程中的主要参数，更好的评估器件性能，优化驱动设计等等。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"虽然功率半导体器件的手册上会有参数标注，但这些参数都是在标准测试条件下得到的。使用IGBT或者MOSFET做逆变器的工程师如果不加以测试，而直接在标定的工况下跑看能否达到设计的功率，无法全面了解器件性能，进而影响产品长期可靠性。又或者设计裕量过大带来成本增加，使得产品的市场竞争力下降。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"如果能在设计研发阶段，精准地了解器件的开关性能，将对整个产品的优化带来极大的好处。比如能在不同的电压、电流和温度下获得开关损耗，给系统仿真提供可靠的数据；又比如可以通过观察波形振荡情况来选择合适的门极电阻。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"ITECH作为功率半导体测试领域的领先供应商，为双脉冲测试提供多种先进电源及源表产品。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"□双脉冲测试平台"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"测试设备:"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"1.高压电源:IT6700H/IT6018C-1500-40/IT-M3906C-1500-12"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"2.电容组 "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"3.负载电感 "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"4.示波器"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"5.高压差分电压探头(1000:1)"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"6.电流探头"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"7.SMU: IT2806"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":{"image":"https://files.eteforum.com/article/202301/97f06012fdc10298.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"□双脉冲测试流程:"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"Step 1.在t0时刻，被测IGBT的门极接收到第一个脉冲，被测IGBT导通,母线电压U加在负载电感L上，电感上的电流线性上升，I=U*t/L"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"IGBT关断前的tl时刻，电感电流的数值由U和L决定；在U和L都确定时，电流的数值由IGBT开启的脉宽T1决定，开启时间越长，电流越大。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"执行点：通过改变脉冲宽度的大小，自主设定电流的数值。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":{"image":"https://files.eteforum.com/article/202301/a14580aaf34435b9.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"Step 2. tl到t2之间，IGBT关断，此时负载的电流L的电流由上管二极管续 流，该电流缓慢衰减。tl时刻，IGBT关断，因为母线杂散电感Ls的存在，会产生一定的电压尖峰，"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"关注点：在该时刻，重点是观察IGBT的关断过程，电压尖峰是重要的监控对象。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":{"image":"https://files.eteforum.com/article/202301/c18ef73d9ecee1ab.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"Step 3.在t2时刻，被测IGBT再次导通，续流二极管进入反向恢复状态，反向恢复电流会穿过IGBT,此时电流探头所测得的Ic为FRD反向电流与电感 电流叠加，产生电流尖峰。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"重点观察：IGBT的开通过程，电流峰值是重要的监控对象，同时应注意观察栅极波形是否存在震荡现象。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":{"image":"https://files.eteforum.com/article/202301/963397bc9665542d.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"Step 4.在t3时刻，被测IGBT再次关断，与第一次关断相同，因为母线杂散电感Ls的存在，会产生一定的电压尖峰。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"重点是观察：关断之后电压和电流是否存在不合适的震荡"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":{"image":"https://files.eteforum.com/article/202301/385e9f6bcbb10601.png"}},{"attributes":{"color":"#000000"},"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"□通过双脉冲测试我们可以得到什么？"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"1 .获取ICRM （最大峰值电流）IRBSOA（最大关断电流）"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":{"image":"https://files.eteforum.com/article/202301/6ce6c1c1bd040635.png"}},{"attributes":{"color":"#000000"},"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"2.测量主电路杂散电感：Us=Ls*di/dt"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":{"image":"https://files.eteforum.com/article/202301/6749dcdffc519c38.png"}},{"attributes":{"color":"#000000"},"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"3.评估续流二极管的风险"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":{"image":"https://files.eteforum.com/article/202301/fa4da36acd3a90d3.png"}},{"attributes":{"color":"#000000"},"insert":" "},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"□双脉冲测试中的电流源"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"随着功率半导体技术的发展，IGBT、MOSFET、BJT等半导体器件向小型化、集成化、大功率方向发展。为了避免大功率测试过程中温升对测试造成影响、甚至烧坏器件。在法规和行业测试中，通常会给被测器件施加满足功率条件下的瞬时电流脉冲，进行半导体器件相关参数测试。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"□电容储能式脉冲电流源"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"脉冲恒流源以储能电容放电的方式发生电流脉冲。从功能实现的角度分析，脉冲电源的工作电路由以下两个基本回路组成："},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":{"image":"https://files.eteforum.com/article/202301/5098b8c015755c32.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"电容充电电路：直流源通过限流电阻R给超级电容充电"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"脉充放电电流：超级电容C通过开关管对负载RL放电"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"脉冲电流幅值：电容C充电压控制和电阻RL决定"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"脉冲宽度：开关时间t决定"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"□电容充电"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"根据超级电容的特性，充电电源应当具备宽范围输出能力，可实现如下功能："},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"电压高速建立并维持稳定；"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"电流高速上升、无明显过冲；"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"ITECH高压电源推荐型号:"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"IT6018C-2250-20"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"IT6018C-1500-40"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"IT-M3906C-1500-12"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"IT6726V"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"IT6000C系列电源最高电压可达2250V, IT-M3900C系列电源可达 1500V,适应高电压测试需求。IT6726V参数为1200V/5A/3kW也可作为基础型选择。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"□充电电源典型案例:"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"某客户IGBT测试系统使用IT6018C-2250-20给16F电容充电测试:"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":" "},{"insert":{"image":"https://files.eteforum.com/article/202301/706c3a56359a4b70.png"}},{"attributes":{"align":"center"},"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"客户期望在超级电容充电过程中电压建立速度快，过冲小。使用ITECH IT6000C系列高性能直流电源产品，利用CC/CV优先权功能有优秀的表现,帮助用户提高测试效率。"},{"insert":"\n"},{"attributes":{"color":"#000000"},"insert":"——转自艾德克斯电子"},{"attributes":{"align":"right"},"insert":"\n"},{"insert":"\n"}]