【经验】如何解决保险丝由非故障电流导致的异常熔断问题?
保险丝是一种电流敏感元件,当有不被允许的故障电流通过时保险丝熔断是比较正常的保护功能,而实际应用经常有一些非故障电流导致的异常熔断让工程师非常头疼,本文将结合LITTELFUSE的SPF系列保险丝讨论一下如何解决保险丝由非故障电流导致的异常熔断问题。
如图1所示,是一个轨道交通电源二次电源供电的框图,一次电源输出采用电容C1进行滤波,二次电源输入采用保险丝F1用于保护二次电源及负载;一次电源输出600-800VDC,额定电流1A,短路电流限制在10A,根据参数要求,推荐Littelfuse的1000VDC耐压的SPF系列2A保险丝0SPF002.T,前期测试性能通过。在后续批量生产过程中,由于一次电源输出纹波滤波问题,将电容C1的容量调大,发现保险丝F1在开关机瞬间有异常熔断的现象。
图1 轨道交通电源二次电源供电的框图
测试开关机瞬间流过F1的电流波形如图2所示,发现电流瞬间的峰值可以达到60A,持续时间在200us左右,此时需要判断0SPF002.T能否抗的住这个脉冲的能量,首先需要根据保险丝的电流时间曲线图来初步判断是否合适。
图2 电容C1容量调大后流过保险丝F1的电流波形示意图
参考SPF系列规格书的电流时间曲线图如图2所示,发现曲线图并没有给出0SPF002.T在60A时对应的时间参数,只给出了最大9A电流的时间是0.01s。此时需要根据I2t来判断这个脉冲能量是否超过了保险丝能承受的上限值,目前波形的峰值电流是60A,考虑温度因素(0.78)和UL认证(0.75)的折算,实际参考电流IP=60A/(0.78*0.75)=102A,根据脉冲波形计算实际:
I2t=1/2*IP*T=1/2*1022*0.2*10﹣6=2.08A2s;
考虑10万次工作寿命的余量,实际最终选型需要的I2t值为2.08/0.22=9.45A2s。而0SPF002.T的I2t值为0.554A2s,比单次脉冲的能量都要小,故需要重新选更大I2t的保险丝,参考规格书4A的产品I2t值在23.031 A2s,同时额定电流也满足实际产品需求,综合评估,选择0SPF004.T的保险丝比较合适。
图2 SPF系列保险丝的电流时间曲线示意图
综上所述,对于非故障电流导致的保险丝异常熔断问题,除了从电流时间曲线上考虑外,还可以从I2t值评估保险丝所承受的脉冲余量是否足够。
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目录- 保险丝特性/术语/考量因素 选择清单 标准 包装/零件编号 免责声明 表面贴装保险丝 径向引线型保险丝 轴向引线型和管式保险丝 管式保险丝座 特殊应用保险丝
型号- 45302.5,0977016.XEP,03540903ZXGY,0154.125,03540821ZXBL,0482 0007ZXB,03540911ZXGY,01550009ZXA,111 501,111 505,111 506,0454003.,0454001.,01550009ZXU,3453HS3-010,03540001ZXGY,800,801,03540806ZXGY,802,454007,803,804,454005,454004,0477016.XEP,454003,0454002.,807,808,0482 0019ZXB,015401.6,015401.5,0100 0054,208 000P,0977.800XEP,0216 000XP,154.315,820 20,0453.250,0215.125XEP,345 101,225 000P,810,811,640 0000 1603,813,814,815,816,0482 0007ZXP,559 0000 00 01,0154.375,0275025.,121004,282008,65800001XXX,121001,282007,820,121002,821,282002,0100 0058,823,824,282001,0100 0056,3453LF2-010,03540912ZXGY,154.375,0216.800XEP,03540807ZXGY,100 058,0453002.,0453.080,100 054,100 056,01550114ZXA,830,03540902ZXGY,831,0281 0008H,0107 0002,853 0000 1009,834,0454007.,835,837,0477.800XEP,279 000,154.125,0106 0001,216SP,800 01,0154.315,101001,0482 0001ZXPF,0215001.XEP,0453003.,0482 0019ZXP,562 0000 1009,3453HS4-010,01550114ZXU,454002,454001,015403.5,453.062,02450002X,3453LF1-010,65800003XXX,0154.100,850,0482 0009ZXB,851,852,853,855,856,0454005.,02450002H,129 002,0213 000P,129 001,01550020ZXA,0100 0020,0482 0020ZXB,314 000P,866 0000 1009,02450001X,0453001.,15403.5,3453LF1-020,0281 0007H,0482 0020ZXP,0453.062,154.750 T,860,862,865,03540010ZXGY,866,837 0000 0005,02450001H,01550020ZXU,0454004.,0520 0005 ZXGY,313 000P,824 0000 0005,125002,125001,0213 000 XEP,870,03540808ZXGY,874,875,876,877,PICO 259,0217.315 XEP,3453LF4-010,0154.750,0453007.,649 0000 3039,0285.125 XRP,127 002,0281 0005H,640,816 0000 0005,655 0000 0405,400,646,648,649,0482 0015ZXP,127 001,0482 0009ZXBF,0217.400 XEP,815 0000 0005,342 058,52100001009,830 0000 0005,0453004.,01550104ZXU,0482 0002ZXPF,652,653,0482 0005ZXB,655,0482 0010ZXPF,656,101002,658,101003,646 1200 7113,659,01550104ZXA,03540011ZXGY,451.1,03540901ZXGY,0453005.,342 048,660,824 0000 0205,429,0215020P,0482 0017ZXB,649 0000 1039,435,437,438,659 0000 0009,0482 0005ZXP,0451.062,440,441,443,202,203,445,254 121,446,688,447,448,449,208,209,646 1200 7123,154001. T,0482 0003ZXPF,0154.500,0453008.,824 20,451,452,453,0520 0001,354 101-GY,454,213,456,215,03540012ZXGY,458,216,459,217,218,453.1,453.2,03540809ZXGY,453.8,453.5,0520 0004 Z,453.4,460,3453LF3-010,461,0451.080,312 000,462,220,464,465,0482 0008ZXBF,466,224,467,225,468,469,254 101,229,800 0000 0105,0482 0017ZXP,560 0000 13 19,01000020Z,471,230,472,0101 0001,473,232,233,0356 0011Z,234,477,235,239,125 001,125 003,570 0000 0001,125 002,0445 0001,03540601ZXGY,154002. T,109 002,345_ISF,02200029MXP,0281 0001,109 001,481,482,0101 0002,242,485,0101 0003,0482 0016ZXBF,04533.15,245,0356 0010Z,0215020.XEP,01550004ZXA,102064,345 101-010,0482 0002ZXB,0482 0002ZXP,03540005ZXGY,803 01,251,494,253,254,0122 055Z-1,348 677,354 700,01550004ZXU,348 671,03540101ZXGY,0482 0019ZXPF,15401.5 T,03540906ZXGY,3453QS2-010,0216.050XEP,345 101-020,03540803ZXGY,262,102071,263,265,266,267,268,520 001,269,520 003,520 004,PICO 259-UL913,0482 0007ZXBF,0235006.XEP,0482 0004ZXPF,0218 000P,272,030,273,274,03540602ZXGY,275,154.8,262 000,278,0239 000P,279,505 000P,0453.630,154.1,0154007.,0482 0014ZXP,154.5,154.4,154004. 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SERIES,0327XXX.LXS,02400103_,0997005_,033707.5_,157.5701.6141,156.5610.540_,3298600.ZXSTA,293 SERIES,028707.5_,0891XXX.U,0898250._,142.5395.XXXX,0891XXX.H,155.0892.6201,SHEV150.ZXBD,02400115P,142.5631.XXXX,0317010.M,4998150.M_,0287002._,0287025._,157.5701.6171,32980001ZXM8,157.5917.6501,0695XXX.PXP-HT,0298060._,4998060.M_,0997002_,156.5610.611_,0891020._,0495040_,142.7010.5802,3998900._,20EV125.ZXBDM,157.5916.5801,0317900.M,153.XXXX.6222,157.5700.5351,0HEVXXX.ZXP2Y,02400106P,153.XXXX.6102,02400118P,876-199,157.5700.6201,3998125._,02400105Z,0298250.ZXEH-LT,157.5701.6161,0895XXX.T,0298300._,0895XXX.U,0695025.PXPS,153.XXXX.610_,0998100._,0899040.Z,156.5610.612_,0997003_,0997015_,SHEV100.ZXBD,0317015.M,0297030._,142.5631.5802,902-192,0287003._,0HEVXXX.ZXPCB2,0297XXX.WXT,3298400._,0297XXX.WXNV,0891XXX.NXWS,156.5610.625_,0899030.Z,0899XXX.Z,0299025._,3998200._,142.7010.5702,0495050_,0HEVXXX.ZXPCBL,153.XXXX.6122,0317005.M,2938 SERIES,0895XXX.Z,157.5700.6301,02400108P,157.5700.6421,0495XXX.UXA,3998080._,10EV040.XXX,3298400.ZXSTA,153.XXXX.612_,0898350._,0327020._,3298060.H,0997025_,0297XXX.H,3298400.H,0888300._,3298060.Z,0297XXX.L,SHEV070.ZXBD,05980020Z,153.XXXX.6252,0695050.PXPS,0298XXX.ZXEH-UL,02400107P,0297XXX.U,153.0020.XXX2,0287004._,0327030._,0298XXX.ZXH,0997010_,0298XXX.UXP-1M8,0298XXX.UXP-1M6,0498XXX.MXTM6,0498175._,153.5395.XXXX,157.
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技术问答 发布时间 : 2019-12-12
【元件】LITTELFUSE推出行业首创超大电流SMD保险丝系列,提供150A和200A额定电流规格
LITTELFUSE近日宣布推出871系列超大电流SMD保险丝,这一创新系列是对881系列的补充,提供150A和200A保险丝额定电流,是对881系列125A最大额定电流的重大升级。871保险丝系列为电子设计人员提供单保险丝、表面安装解决方案,无需并联保险丝配置。
产品 发布时间 : 2024-10-09
Littelfuse(力特)POWR-GARD®保险丝选型表
描述- Littelfuse offers a variety of industrial power fuses to serve numerous applications. Littelfuse provides a innovative selection of power fuses to meet the needs of customers.
型号- PV-1A10F,KTK,DFJ,GLR,L50QS,C520,PV_A14LF10F,A50QS,BBS,CRN-R,235,239,CCMR,GMA,HP10M,LLSRK,LDFJ,ATDR,GMD,AG,SPXI,MID,481,SPXC,GMT,SEC,A2K-R,RF,LGR,AX,FLA,JTD,SPXV,TGS,ABC,JTD_ID,FLM,FRN-R,FLQ,FLU,251,SA,SC,NLN,SFE,JDL,NLS,LHR,KLKD,SL,KTU 2500-6000A,ASO,SP,A025F,A013F,FWC-10F,JLLN,CJ,ACK,CM,JLLS,ATC,FNA,TL,ATM,REN,ATO,ATQ,TR,HP15G,RES,A3T,FNM,L25S,FNQ,KLLU,A25X,A13X,RFA,RFC,CTS-R,JFL,LLSRK_ID,HP10M_CC,A4J,IDSR,HCTR,RFL,TJN,RFN,TJS,HSJ,RFS,LENRK,PSC,RFV,A70P,FLSR_ID,KLKR,NON,PSR,287,KTKR,NOS,PSX,A6K-R,LKU,HP15M,L15S,50KOTN,ECNR,JHC,KLNR,50KOTS,LPCC,CJS,KTNR,JHL,170M,TLO,TLN,RHN,TLS,AGA,PC_UD,RHS,TRS-R,AGC,A6T,L60QS,PV-30A10F,A60X,HEB,MOF,A60Q,MOL,L70S,AGU,LONRK,AGW,A2D-R,HET,CLF,L17T,CLL,KLC,GDB,GDA,ATMR,GDC,OTN,OTM,SLC,KLK,NRN,FRS-R,CLU,KLM,GDL,NRS,JJN,OTS,KLQ,JJS,KLU,SLO,SF60X,GEB,FLNR,A50P,L60S,JKS,TOO,A050F,KLPC,BLF,LOSRK,CNL,ERN,GFA,BLN,ERS,LPJ,BLS,AJT,HP15M_CC,GFN,L70QS,JLS,SF50P,A_UD,CTN-R,TPS,EBS,LPNRK,PV_A10FCT,ECSR,CRS-R,GGC,KN,ESS,ESR,FLNR_ID,CHSF,KS,KON,GGM,XL50F,KOS,L50S,SOO,KRP-C,PV_A14LF85L,A6D-R,MCR,MTH,L75QS,FLSR,SPF,ATQR,GEBN,MDA,KLDR,TRM,FWA,TRN-R,312,MDL,TRS,313,A015R,314,FWH,315,A015F,AMG,MDQ,LPSRK,CNN_E,AMI,FWP,MDV,MDX,KLSR,FWX,KAA,KTSR,KAC,KAB,MEG,A070F,A4BY,DCT,LCL,326,MEN,MEQ,A4BT,A4BQ,KTU 601-2000A,ANL,LCU,SAO,ANN,SPFI,SPFJ,LDC,HLR,KBH,A70QS,LLNRK,SF70P,216,217,218,NCLR,HCLR,XL70F,C519,OT,10KOTS,BAF,LEB,CCK,581,BAN,SF25X,FNQ-R,SF13X,225,A060F,229,LET,XL25X,LESRK,HP6J
【技术】Littelfuse解析保险丝及其应用注意事项
保险丝作为过流保护器件,在电子行业得到普遍应用,存在感非常强,却又那么不起眼,只要不是全新的设计方案,只要没出问题,经验的沿用以至于很多硬件工程师对于保险丝的参数与选型不明所以。Littelfuse浅显易懂地讲述保险丝及其应用注意事项,供有需人士参考。
技术探讨 发布时间 : 2022-08-31
294C Series PAL Fuses – Rated 32 V DC Fuse Datasheet
型号- 294C,0294080._,0294060._,0294100._,0294050._,0294020._,294C SERIES,0294120._,0294XXX.MXJ-C
【产品】紧凑型OMNI-BLOK®保险丝座254系列,配有增强型保险丝夹,独特设计可自动对准保险丝盖
254系列是Littelfuse公司推出的紧凑型OMNI-BLOK®保险丝座,与2AG保险丝搭配使用。254系列设计有焊接型端子、Q.C.端子或PCB板安装型端子可供选择,而针对PCB板安装又提供了正常环境下使用的镀锡黄铜端子或腐蚀性环境中使用的镀锡铍铜端子。此外,254系列保险丝座标配有增强型保险丝夹,这充分保证了器件稳定性和安全性,可用于保护电路、电池盒、车辆等领域。
新产品 发布时间 : 2019-03-21
Fuse Holders-High Currrent: Bolt-down Fuse Holders-Fuse Holder for MEGA ® Style Fuse
型号- 02981001ZXT,0298907-040,0298907-030
BLADE Fuse CARTRIDGE Fuse BOLT DOWN Fuse ZCASE Fuse MASTERFUSE Fuse Selection Chart
型号- 0299***.ZXT,3298***,0888***,4998***.MXISO,153.7011.***,142.5395****,0298***,0891***.NXWS,0695***.PXPS,0898***,0998***.UXISO,0297***.WXNV,0895***.Z,0878450,0899****.Z,0498***.MX1M6-IH,0698***,0998***,0999***.ZXN,153.5395.***,0299***,0327***.YXT2,0695040.PXP-HT,0287***.PXCN,0891***.NXS,0899****.ZXR,0297***.WXT,0498***,4998***,0298***.UXT,142.***,0287***.PXS,0598***,0297***.U,0695***.PXPS-HT,0495***,0891***.U,0327***,153.***.***,0997***.WXN,0695***.PXP,0297***.H,0298***.ZXEH-UL,3998***.ZXM10,0297***.L,0337***,3298***.ZXM10,0891***.H,0298***.***LT
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