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英飞凌IGBT厂家 > 英飞凌IGBT模块驱动 > 如何通过IGBT模块内置的NTC电阻测量芯片结温?

如何通过IGBT模块内置的NTC电阻测量芯片结温?

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白小姐四肖必选一肖SHENZHENYISHENGTONGKEJIYOUXIANGONGSI

时间 : 2018-09-21 21:16 浏览量 : 37

如何通过IGBT模块内置的NTC电阻测量芯片结温?

  • 摘要

IGBTMOKUAIDEXINPIANWENDUSHIDIANLIDIANZIXITONGFEICHANGZHONGYAODECANSHU。YOUYUWUFAZHIJIECELIANGXITONGYUNXINGSHIDEXINPIANWENDU,SUOYIDEYAOJIEZHUQITADEWENDUCHUANGANQI,BIRUIGBTMOKUAINEIZHIDENTCDIANZU,GENJUNTCDIANZUDESHISHISHUZHI,TONGGUOCHAXUNYUXIANCELIANGDEXINPIANWENDU-NTCDIANZUWENDUGUANXIQUXIAN,JIANJIEYUGUXINPIANWENDU。SUOYITIQIANQUEDINGXINPIANWENDUHEWENDUCHUANGANQIDEGUANXIQUXIANSHIFEICHANGZHONGYAODEGONGZUO。BENWENJIYUTEDINGDESHIYANZHUANGZHI,JIESHAOLEYIZHONGJIANYIKEKAODECELIANGFANGFA,YIHUOQUXINPIANWENDUHENTCDIANZUDEDUIYINGGUANXI。

JIESHAO

ZAISHEJIDIANLIDIANZIXITONGDECHUSHIJIEDUAN,TONGCHANGHUIZUODIANQIFANGZHENHEREFANGZHEN。DUIYUREFANGZHENLAISHUO,JINKENENGZHUNQUEDEQUEDINGIGBTXINPIANWENDUDUIYUYUCEMOKUAISHOUMINGZHIGUANZHONGYAO。SUIRANJEDECBIAOZHUN[1]DINGYILEin-siteJIEWENCELIANGFANGFA,DANSHICIFANGFADESHEBEISHIYONGKUNNANBINGQIEHENNANZAISHIJIYUNXINGDEXITONGZHONGJINXINGCELIANG。LINGWAIYIZHONGGUJIXINPIANWENDUDEJIANYIFANGFARUTU1ZUOCEDESHIYANPINGTAISUOSHI。

图1:左-测温试验台,由IGBT模块,电源,数据采集系统,冷却设备和测温设备组成 右-被测IGBT模块的红外图像,只加热二极管芯片

被测器件是英飞凌公司的一款PrimePACK模块FF1000R17IE4(1000A/1700V),固定在风冷散热器上并且冷却风速可调。通过测量保证散热器风量和实际系统的工况相同。芯片的温度用红外热成像仪测量(IR-Camera),芯片下方的基板壳温用贴在基板上的热电偶测量。NTC电阻值通过数据采集器记录并且根据IGBT模块数据手册中的电阻-温度曲线将电阻值转换成对应的温度值,同时用红外热成像仪直接测量NTC电阻的温度。被测器件通过低压直流源供电,当大电流通过芯片时,在芯片上产生压降和损耗,从而为芯片加热。图1中的右图是被测器件的热成像图,通过调节直流源的输出电流,可以改变芯片的加热功率,进而得到不同发热功率下的芯片温度。待芯片温度稳定后,记录数据采集器和热成像仪的测量结果,如表1所示:

表1 基于强迫风冷试验台的热测量结果

白小姐四肖必选一肖JIEZHUSHUJUCHULIGONGJU,BIRUExcel,DUICELIANGDENTCDIANZU[Ω]HEERJIGUANWENDU[℃]JINXINGXIAOZHENG,BIANKEDEDAOLIANGZHEDEDUIYINGGUANXItdiode=f(RNTC),JIANTU2,QIZHONGHAIBAOKUOXIANGYINGDEDUOXIANGSHICHAZHIGONGSHI。

图2 芯片温度和NTC电阻值的实测关系曲线(基于特定的测试台)

TU2ZHONGDEFEIXIANXINGQUXIANXUYAOYONG3CIDUOXIANGSHICHAZHICAINENGZHUNQUEMIAOSHU。NTCDIANZUDETEXINGCANSHUTONGCHANGYOUBANDAOTIDEGUIGESHUJICHU,SUOYIKEYIHENRONGYIDEBANTCDIANZUZHIZHUANHUANCHENGDUIYINGDEWENDUZHI。YONGNTCDIANZUDEWENDUTIHUANTU2ZHONGDENTCDIANZUZHI,BIANKEDEDAONTCDIANZUWENDUHEXINPIANWENDUDEXIANXINGDUIYINGGUANXItdiode=f(TNTC),RUTU3SUOSHI。

图3 芯片温度和NTC电阻温度的实测关系曲线(基于特定的测试台)

XITONGDELENGQUEFANGSHIDUISANREDEYINGXIANGYEBIJIAODA。ZAIFENGLENGXITONGZHONG,MOKUAICHANSHENGDERELIANGZAIJIBANHESANREQISHANGHENGXIANGCHUANBO,NENGCHONGFENDEJIARENTCDIANZU。RUGUOCAIYONGGAOXIAODESHUILENGXITONG,RELIANGZAIJIBANSHUIPINGFANGXIANGDEKUOSANCHENGDUJIAODI,CONGERJIANRUOLEYUNTCDIANZUDEREOUHE。SUOYI,ZAISHUILENGXITONGZHONG,XINPIANHENTCDIANZUZHIJIANDEWENCHAHUIZENGJIA。YUFENGLENGXITONGXIANGTONGDERECESHI(XIANGTONGDEMOKUAI,XIANGTONGDEREFUZAI)YEZAISHUILENGXITONGSHANGJINXINGLEZHONGFUSHIYAN,RUTU4SUOSHI。

图4 :左-水冷试验台;右-被测IGBT模块的红外图像,只加热二极管芯片

BIAO2SHISHUILENGXITONGDERECESHIJIEGUO,BAOKUODILIUSU(5.6L/min)HEGAOLIUSU(12.8L/min)LIANGZHONGSHUILENGGONGKUANG。ZAIMEIZHONGGONGKUANGXIA,TONGGUODIAOJIEXINPIANDEDIANLIU,SHIXINPIANDEWENTAIWENDUJINLIANGYIZHI。

表2 基于水冷试验台的热测量结果

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图5 :不同冷却条件下的芯片—NTC电阻温度曲线

白小姐四肖必选一肖RECESHIJIEGUOBIAOMING,XINPIANHENTCDIANZUZHIJIANDEWENDUCHASUILENGQUEXITONGXINGNENGDETISHENGERZENGJIA,SUOYIDUIYUBUTONGDEXITONGYINGYONGGONGKUANG,WUFAJICHUTONGYONGDEXINPIAN-NTCDIANZUWENDUQUXIAN。

  • 模型的局限

BENWENDERECESHIFANGFAJIANYAOJIESHAOLEHUOQUMOKUAINEIBUXINPIANWENDUYUNTCDIANZU(DIANZUZHI、WENDUZHI)ZHIJIANDEGUANXIQUXIAN。RUGUOXIANGHUODEGENGJIAJINGQUEDEGUANXIQUXIAN,ZEXUYAOZIXIKAOLVCESHIGUOCHENGZHONGMEIYIBUDEXIJIE,YOUQISHIDANGQUEDINGGUOZAIBAOHUDECHUFAZHISHI,BIXUGENGJIAZHUNQUEDECELIANGWENDU。

1)本方法的有效性

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2)最热点vs Tvj,max

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3)直流源vs交流源

ZAISHIJIXITONGZHONG,MOKUAIZHONGDEIGBTXINPIANHEERJIGUANXINPIANTONGSHIFARE,XINPIANZHIJIANYOUREOUHE。WEILEBIANYUCAOZUO,BENSHIYANCAIYONGZHILIUYUANJIAREBEICEMOKUAIDEERJIGUANXINPIAN,HULVELEXINPIANZHIJIANDEREOUHE。WEILESHIXINPIANFAREHEBICIZHIJIANDEOUHEGENGJIEJINSHIJIGONGKUANG,KEYICAIYONGJIAOLIUYUANDAITIZHILIUYUAN。CANKAOWENXIAN[5]XIANGXIJIESHAOLEJIAOLIUYUANJIAREXINPIANDEFANGFA。

  • 结论

对于内置NTC电阻的功率模块来说,芯片和NTC电阻之间没有通用的关联模型(热阻或者温度关系)。在特定的系统中进行热测试,是精确获得两者相互关系的必然手段。本实验基于特定的实验平台,通过对稳态热测试数据进行拟合,得到了NTC电阻和芯片温度之间的关系曲线。红外热成像方法的测温数据非常全面,包括芯片的热梯度和最热点等信息,同时还可以借助这种测温方法总体考虑整个系统的热设计。(英飞凌igbt厂家