【经验】如何使用Keysight LCR表E4980AL测试变压器漏感?
现在的电子产品十分看重电源的稳定性、可靠性。开关电源因其效率高、体积小而被电子企业广泛应用,对于开关电源的测试方法和测试项目有很多。为了满足器件的降额使用要求,其中一项测试就是测试Vds(开关电源芯片MOS管漏极D和源极S之间的电压)余量。Vds测试需要测量不用电压应力下,上电瞬间、空载、重载、轻载-重载变化、重载-轻载变化等条件下的Vds,要满足降额要求(85%),否则测试不通过。
项目开发中使用到了反激式开关电源,局部pcb如图1所示,电子物料二元化要求开发多家变压器供应商,对新打样的变压器进行了测试,降额测试中发现在输入电压280V,电流0.7A测试条件下,Vds不满足降额要求(700V,85%降额),实测值为620V,为88.57%,如图2所示。
图1 局部pcb 图2 Vds-620V
实际变压器的等效模型如图3所示,开关电源测试Vds大小中和XL1有很大关系,笔者认为新变压器的漏感太大导致Vds降额不足,原因是漏感会存储一定的能量,漏感里面的能量不能传递到变压器副边,只能通过开关管以电压尖峰释放。漏感越大,存储的能量越多,所以尖峰越大。LCR测试仪是一种采用交流方式测量电感、电容、电阻、阻抗等无源元件参数的装置,为了比较新旧变压器的漏感大小,使用是德科技的LCR表E4980AL进行变压器漏感测试,笔者使用LCR仪,20 Hz 至500 kHz,在任意频率范围内均能提供 4 位分辨率,在高低阻抗下进行测量,均可实现卓越的测量可重复性和 0.05% 的基本测量精度。
图3 实际变压器等效模型
开关电源变压器漏感测试,将变压器的次级绕组短路,然后测试初级绕组的电感量,就是漏感.测试过程如下:
图4 测试条件设置(根据变压器规格书)
图5 变压器次级绕组短路
图 6 旧变压器初级绕组漏感
图7 新变压器初级绕组漏感
图8 旧变压器初级绕组电感
图9 新变压器初级绕组电感
结论
在变压器电感量大小相差不大的情况下,新变压器的漏感比约为51.9/596.4=8.7%。出于可靠性要求,变压器的漏感比应小于5%。
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Keysight(是德科技)测试仪器分销产品选型指南(英文)
目录- BenchVue Control and Analysis Software RF Bench and Handheld Instruments Handheld Spectrum Analyzers FieldFox Handheld Analyzers Spectrum Analyzers, Signal Analyzer Audio Analyzer and Signal Generator Power Sensors and Power Meters RF and Microwave Test Accessories Vector Network Analyzers and ECal Modules Essential Bench Oscilloscopes, Applications, and Probes Digital Multimeters Function/Arbitrary Waveform Generators Data Acquisition/Switch Units USB Products and Connectivity Frequency Counters/Timers Power Supplies Bench Power Supplies System Power Supplies Precision Power Supplies System Power Supplies(continued) DC Power Analyzer, SMUs, and DC Electronic Loads AC Power Sources LCR Meters Handheld Instruments
型号- U8480,B2911A,U1272A,N8926A,34460A,N7040A,U8000,N9340B,53140,N5742A,N5766A,34905A,N9918A,N6735B,N8480,N5743A,N5767A,N1914A,3024T,3012T,U1273A,34904A,N6746B,N6734B,U3800,U1282A,N8948A,34470A,N7042A,N1913A,N5744A,N5768A,34903A,N8924A,N9916A,N9928A,34939A,N6701C,N8949A,U1271A,N8925A,N8937A,N7041A,N1912A,N9000B,N5745A,N5769A,N2819A,3022T,3034T,N6700C,34902A,N9917A,34938A,N6736B,U1600,8491A,DSOX1102G,DSOX1102A,N9320B,P-SERIES,33509B,N7020A,N1911A,N9344C,N5746A,N3302A,N2818A,34901A,34937A,U1701B,82357B,U1273AX,U2802A,N5181B,N2142A,U1281A,B2902A,4024A,N5747A,N3303A,8490G,N2805A,3032T,N6702C,U1700,N6705C,N8928A,N9342C,33519B,B2901A,N3304A,N5748A,34947A,N2804A,N8929A,N5171B,N9343C,N2140A,X-SERIES,B2912A,N3305A,U8903B,N5749A,4022A,34934A,4034A,34946A,8480D,3054T,U2702A,N3306A,U1733C,U1210,U2300,N5700,34945A,3458A,TU1453A,U2701A,B2962A,1146B,N3307A,1147B,N7026A,33600A,33612A,B2961A,N9322C,N9310A,U1731C,2002A,53200,2014A,3104T,U1610A,U2723A,33611A,2004A,U1732C,J7205A,34942A,U3606B,53210A,J7205B,U2722A,N1810UL,33622A,3102T,34941A,N8760A,2012A,2024A,U2500,U1620A,33512B,33500B,33621A,N1810TL,3004A,N6700,N6705,N8761A,N2821A,33511B,N3300,4104A,2022A,N2820A,U2600,33510B,33522B,3014T,N2843A,E36100B,33521B,N9962A,87106D,AC6804B,E4982A,DAQM905A,34950A-34959A,N6750,N9950A,N8740A,E36103B,U2020,EDUX1002A,N9951A,33520B,N7007A,83050A,N2962A,53131A,P9243A,E4981A,U2741A,34972A,E36102B,J7211B,J7211A,J7211C,E36320A,N8741A,AC6802B,DAQM903A,U1270,N9960A,E36311A,N8762A,E36105B,N6781A,U2000,E3641A,EDUX1002G,N2863B,AC6803B,DAQM904A,N8900,U1280,84904L,U2751A,34970A,N9961A,B2900,E36104B,E3640A,AC6800B,N2862B,6002A,E3600,E-SERIES,E36313A,DAQM900A,U1250,U5850,N8756A,N8732A,N8950A,AC6801B,10070D,DAQM902A,U2761A,34980A,E36300A,E36312A,N6782A,DAQM901A,E36106B,53220A,N8757A,87222D,N8733A,N8951A,87222E,N9952A,87104D,P9242A,E4980A,6004A,53132A,N6785A,N6773A,U1452A,B2980A,N6761A,N8754A,N8742A,P9241A,N2871A,53230A,N8700,N4985A-S50,U1240,N6784A,E4981A-001,E4981A-002,N8755A,U1453A,N8731A,N2870A,8495D,N2797A,87405B,N2894A,N5770A,8495B,87405C,34420A,E3647A,10833F,34921A-25A,10833G,10833A,10833B,4154A,10833C,10833D,N6775A,U1450A,N8736A,N6763A,U1232A,N8954A,N6751A,N8930A,N7550,N9923A,N2796A,N9935A,N2893A,N5771A,E36100,E3646A,6811C,N4985A-S30,4032A,N8737A,N6786A,N6774A,N8943A,N6762A,E5063A,10834A,N8955A,U1451A,8494G,N8931A,E3634A,U1233A,3052T,N2783B,P9371A,N2795A,N5772A,6813C,E3649A,6800C,6812C,N6753A,N8758A,U1460A,N6741B,U1242C,N8734A,U1242B,N8952A,N6777A,N8940A,N6765A,P9370A,N2891A,N2782B,EPM SERIES,53181A,N5761A,34931A-33A,34465A,E3648A,4054A,N8759A,N6764A,U1231A,U1461A,N6752A,E9320,83020A,N8735A,N8941A,N6776A,N2793A,DAQ970A,N2890A,L2060,N2781B,U1240C,N9914A,82350C,N5750A,N5762A,U2063,E5810B,N8934A,N6743B,N9926A,P1912A,N8946A,N6731B,N9938A,U1252B,E3643A,E3631A,N6755A,14585A,N2792A,N2780B,U1241C,N5763A,E4980AL,N5751A,E36300,E9300,N8923A,N9915A,N8935A,N6742B,N9927A,E3630A,U1241B,4052A,U1253B,E3642A,N6766A,34908A,N6754A,N2791A,N9912A,N8738A,N9936A,U1190,U2040,N5752A,N5764A,34450A,DAQM907A,N8932A,N8944A,34907A,N8920A,E3645A,N6745B,E3633A,N6733B,L2050,N2790A,U1251B,N8739A,N9913A,N9925A,N5741A,DAQM908A,N5765A,34461A,U2053,N8945A,N6732B,N9937A,N8957A,N8921A,E3632A,E3620A,N6756A,E3644A,N6744B
Keysight Technologies(是德科技)——全球电子测试与测量设备的领先制造商
Keysight Technologies(是德科技),原安捷伦电子测试与测量部门。Keysight专注于电子测量行业,潜心服务该行业测试测量领域的客户。其电子测量业务在无线通信系统、新能源、汽车电子、工业、计算机及半导体等行业市场独占鳌头。
品牌简介 发布时间 : 2017-08-03
【选型】Keysight(是德科技)通用及基础测量仪器样本
目录- 示波器和探头 数字万用表 数字采集和开关 频率计数器、函数和任意波形发生器 电源 射频仪表
型号- U1272A,34460A,34133A,53140,N5742A,N5766A,E4980ALU-050,N2919A,N576XA,N5439A,6644A,661XC-220,54600S,34905A,3446MEMU,3000X,U2700,N674XB,34132A,34132B,53150,N5743A,53151,N5767A,661XC-OL2,664XA,3024T,N2918A,6621A,3000T,53152,6645A,N2918B,N9310A-1CM,661XC-230,U1273A,34904A,U1620,E364XA-1CM,N6746B,3000X,DSOXGPIB,N8948A,1000,34131A,DSOX4AUTO,N5744A,N5768A,N2917B,6622A,N3300A,8120-4383,TPS://WWW.SEKORM.COM/WEB/SEARCH/KEYWORDN2801A,34903A,663XB-0B3,DSOX4SENSOR,N8900A,66102A,N6701A,E5387A,66000,U1271A,N8949A,66002A 66001A,11059A,6624A,N5745A,668XA-0B3,8120-5488,N5769A,3022T,6623A,N3301A,33500,8120-5489,34902A,66101A,N9340B-AMA,N2916B,U1600,N6700B,33509B,N7020A,6625A,DSOXLAN,4000X,N3302A,N5746A,8120-5413,8120-6502,N2874,8120-5412,N574XA,U1604A,8120-6980,34901A,34925A,66104A,8120-6507,N2915A,8120-5414,U2802A,66321D,N9310A-1HB,DSO1072B,66321B,663XB-760,B2902A,4000X,6626A,N3303A,N5747A,8120-5421,N2829A,N2862,600,66103A,34924A,N2805A,N6702A,N6705B,N9330B,668XA-909,B2901A,6627A,668XA-908,N3304A,U1602A,N2828A,N5748A,34923A,34947A,8120-8705,N2804A,66106A,6628A,891A,669XA-0L2,N3305A,N5749A,34922A,E5805A,34946A,N2827A,60XX-220,N2803A,66105A,U8001A,DSOX4EMBD,N2849A-68701,1000B,3000,1000A,TPS://WWW.SEKORM.COM/WEB/SEARCH/KEYWORD54600S,N3306A,DSOX4MASK,U1600A,U1210,N2791A/N2891A,34921A,6575A,34945A,1158A,6551A,6684A,3446SECU,N2826A,5485X,N2802A,E363XA-0L2,1134A,DSO1052B,34172B,N3307A,657XA,U3400,6552A,N2801A,60XX-240,5462X,N2825A,34171B,N9340B-ADP,DSOX2000,33612A,33503A,1131A,N9310A,663XB-8ZJ,U1731B,6553A,N2800A,N3300A-UJ1,N2739A,N2848A,N2824A,8121-0695,8121-0694,DSOX2APPBNDL,33611A,B2960A,U8002A,E4980ALU-201,N33313A,1132A,DSOX2AUTO,8120-43831,U3606A,U1732B,6554A,34942A,681XB-1CP,BNC,1157A,U3606B,5464X,681XB-1CM,2000 X,N2738A,DSOX3ADVMATH,6551,N9340B-ABJ,8120-5490,8121-1330,N9340B-ABA,2000X,8121-1331,655XA,8120-8767,53100,8120-8768,34941A,6555A,34832A,663XB-120,N2822A,N9340B-AB2,3000TX,33500B,N5,N9330B-ADP,1130A,U2600A,N9340B-PA3,DSOX3EMBD,200,6641A,669XA-0B3,1131.,N2821A,DSOX3MASK,4000 X,5000,N3300,AC6800,6642A,34830A,N7900,N2820A,N2759A,33522A,33522B,1180CZ,663XB-100,DSOX4COMP,N9310A-1T,N9340B-TG3,6643A,N2867A,N2843A,U1401B,N9340B-INM,AC6804A,DSOX3AUDIO,34840B,DSOX4FLEX,669XA-908,669XA-909,N2733A,N2866B,N2733B,3458A-002,DSOX2EMBD,3458A-001,E2695A,DSO1012A,34972A,N9310A-1TC,60001,N2889A,N2756A,6063B-020,N2732A,AC6802A,6000A,U1270,6000X,DSO1014A,U1880A,N9340B-TAD,90000 X,663XB-020,N2779A,N2888A,6000L,DSOX3COMP,E2697A,N2863B,AC6803A,U2751A,34970A,L4411A,6000X,34401A,N9330B-202,N9330B-203,U1881A,N9330B-201,N2778A,N2887A,54826,8120-1689,7000,N2862B,E4980A-710,668XA-208,54830,U1250,DSOXEDK,6571A,681XB-208,N875XA,N2777A,6680A,N8756A,N8732A,N8950A,TPS://WWW.SEKORM.COM/WEB/SEARCH/KEYWORD1163A,E3610-17A,AC6801A,DSOX3FLEX,681XB-200,10070D,N2885A,N2752A,N5440A,E3451B,81180A,U2531A,54600,6572A,E4980AL-100,6681A,N8757A,N2776A,U3402A,N8733A,53147A,8120-2956,N8951A,681XB-230,N2884A,N2751A,N7971A,DSO1102B,6641A-45A,DSOX2COMP,64997A,6682A,U1230,6573A,U3401A,N6773A,B2980A,N8754A,N7970A,N2750A,DCA-J 86100D,53230A,6813B-019,N5442A,6631BA,8120,6574A,6683A,54620,U1240,N8755A,5484X,N8731A,N2797A,N5770A,N2882A,N873XA,N5443A,34420A,N7973A,10073D,DSOXDVM,E2678A,80000,N28,N6775A,N8736A,8120-2104,N6751A,N8954A,DSOX4PWR,N2881A,E2655C,6063B,N2796A,N5444A,P66321B,N5771A,6812B,N7972A,10074D,E2679A,N5468A,N9340B-XDM,6811B,11053A,9000X,N8737A,N6774A,DSOX3MSO,N8955A,E3634A,N2771B,N2880A,DSOXPERFMSO,N6450,N2795A,N5772A,N5469A,9000,6813B,N5445A,U2356A,8121-6203,N7951A,N6459,N6753A,N8758A,U1242B,N6971A,N8734A,33220A,N8952A,N6777A,681XB-026,53181A,681XB-020,U2331A,661XC-760,10072A,N7950A,60XX-0B3,U2355A,N7974A,DSOX4AUDIO,34465A,E5813A,34138A,E4356A-909,E4356A-908,U1461A,N8759A,N6752A,N6970A,N8735A,N677XB,N6776A,N2793A,N9340B-IBC,U1591A,11058A,U2354A,N5750A,N7953A,N7977A,N5447A,N5423A,E5810B,E5810A,N6731B,N6973A,N2914,DSOX4APPBNDL,661XC-0B3,E3631A,N6755A,N2792A,DSOX3VID,E2675A,DSOX2MASKM,34330A,U2353A,N7976A,E4980AL,N5751A,N9340B-1TC,N5448A,N5424A,N7952A,34136A,DSOX2SEM,N3331A,N6972A,U1241B,E3630A,DSOX4AERO,34908A,N6754A,E2676A,N2791A,N9330B-1TC,N8738A,10075A,U2352A,N5752A,N5425A,U1452AT,3000T X,N577XA,N5449A,DSOXT3DVMCTR,7000B,TPS://WWW.SEKORM.COM/WEB/SEARCH/KEYWORD10076C\,3000 X,U2700 USB,U1177A,N6951A,E363XA-1CM,N2836A-68701,34907A,E3633A,N6733B,E2677A,N9310A-001,N2790A,N675XA,66000A-909,E4980A-301,N8739A,66000A-908,N7954A,10076B,34134A,10076C,U2351A,N5426A,34461A,66319B,8120-4753,N6732B,N6950A,N8957A,E3632A,34906A,N6756A,N6974A,66319D,N9330B-BCG,B2911A,N2111A,8120-5570,N9340B,E2614A,1161A,DSOX3AERO,6632B,8120-5572,N1022B,8120-5573,33250A,54830S,8120-5337,N6735B,N6977A,N6711A,N6953A,661XC-100,1162A,E2615A,6633B,34945EXT,N9330B-BAT,3012T,8120-5342,N6710B,66002A,N6976A,90000Z,N6734B,N6952A,DSOX4WAVEGEN2,90000X,U8031A,663XB-1CM,90000Q,663XB-1CP,34470A,E2616A,N575XA,6634B,8120-6204,661XC-120,90000A,66332A,6651A-55,DSOX2WAVEGEN,34939A,N673XB,1132,1131,82351A,1160A,N2819A,6611C,3034T,N5406A,8120-8871,66000A-0L2,34938A,N6736B,N6954A,N6712A,90000,E5396A,N9320B,6612C,N2818A,E
电容容量的测定方法有什么?
电容测量是分析半导体、元器件、材料等器件及各种电子设备特征的一项基础且十分重要的测量。通常,使用电容表/LCR 表可在高达几 MHz 的多个频率范围内执行电容-电压测量(CV测试),对器件进行表征。电容测量是一种极为常见的测量,但也是一个明明可以预防但还是非常容易出现测量错误的测试领域。
设计经验 发布时间 : 2023-10-30
Keysight(是德科技) E4980A精密LCR表 用户指南(中文)
型号- E4980A/922/710/001/S,E4980A/001,E4980A-301,E4980A-201,E4980A/001/002/922,E4980A,E4980A/710/005/922/S,E4980A/922/002,E4980A/922/710/001/R/50C/011/3,E4980A/922/710,E4980A/922/002/ABA,E4980A/922/710/001,E4980A/922/710/R/50C/011/3,E4980A/922/710/S
Keysight(是德科技)阻抗测量附件选型指南
目录- Impedance Measurements Accessories Introduction Tips for Selecting Appropriate Accessories Impedance Measurements Accessories Product overview Up to 120 MHz (4-Terminal Pair) Components Up to 3 GHz (7 mm) Components Other Accessories Impedance Measurements Accessories part number Index
型号- 16451-60021,04191-85302,8710-0909,16047-00621,E4982A,16032-60071,16198AU-110,16452-60111,16197-90000,16452-00611,16197A,04191-85300,16194A-010,42036A,8710-2081,16451-60014,16380-90011,16451-60013,16196-90040,16380-85101,16334-60001,16451-60012,E4991B-002,E4981A,16196B,16196A,16196D,16196C,42037A,16380-85104,16334A,16201A,16380-90221,16193-60002,16452-24002,16196U-400,16065-90020,1540-0692,42038A,16196-60150,8710-1770,16334-90000,16196U-410,16452-00602,16380C,16452-00601,16065C,16380A,16089A,42030-60100,42942A-700,16065A,16089C,42039A,16089B,16198A,16452-00604,16452-00603,16061-70022,16092-08010,42032A,E4990A-120,16452A,16196-290302,16061-70021,1250-0080,16454-60101,42942-90020,16196-60250,1250-2375,16454-00601,16198A-522,16198AU-202,16198A-521,16198AU-201,16198A-520,16192A,1252-5821,5182-0434,16451B,5182-0435,5182-0436,42033A,5182-0433,16190-90020,16194A-701,16451-60001,16198A-530,16198AU-210,E4980A,16197-25006,42090A,1250-2840,16197-25007,8710-1181,16198A-531,E4991B,16197-25005,16200B,42941-90010,0515-1050,16454A,42034A,16047-01222,16047-01221,42091A,1401-0123,16047-90011,16198AU-104,16198AU-103,16198AU-102,16198AU-101,E4990A,16194A,16453A,16196-60350,16196-60114,16196-60112,42035A,16196-60113,0515-1229,16196U-020,16048-90031,16092A,42030-90001,16048H,16048G,16048D,16048E,16196-24004,16048A,16454-25002,16454-25003,16454-25004,16196C-710,1540-0622,16198A-200,16198AU-522,16198AU-521,16198AU-520,16198A-201,42941-60011,13200-90011,16196-29002,16453-90010,16089-90001,16047E,16196-60450,16196-60213,16196-60214,16047A,16196-60212,16454-25001,E5061B-3L3,16048-90050,E5061B-3L4,42030A,E5061B-3L5,0905-1277,16197A-001,16047-90040,16198A-210,16198AU-531,16198AU-530,42942-60011,04291-60043,16192-90040,16197-29001,0699-6926,42031A,16198AU-545,16198A-101,16198AU-540,16454-90020,16198A-100,16198AU-544,5188-4452,16048-90041,16198A-102,16191-29006,16191-29007,16190B,16191-29004,16191-29005,16191-29002,16191-29003,16089-90020,16191-29001,16196-29027,16196-60312,16196-29028,16191-29008,16196-29026,16197-00603,16198A-110,16197-00604,8121-0003,16192A-701,16453-60011,42941A,16034-90011,16034-90012,E4980AL,1250-1200,0955-1105,16065-90011,16452-90020,16192A-710,16196-60414,5182-7586,16453-60021,0699-2829,16196-60412,42942A,16198A-ABJ,16047-00640,16192A-010,16034-90041,19196D,16034H,42941-60002,16034E,42941-60004,16034G,0515-0914,16452-01201,16194-90030,16198A-ABA,16047-65001,MAR-21,16453-01213,0699-2488,16190-25011,04193-61679,E5061B,16092-90010,16197-60060
如何用简单的方法理解阻抗和导纳?
阻抗测量有多种可选择的方法,每种方法都有各自得优点和缺点。需要首先考虑测量的要求和条件,然后选择最合适的方法。需要考虑的因素包括频率覆盖范围、测量量程、测量精度和操作的方便性。没有一种方法能够包括所有的测量能力,因而在选择测量方法时需要折中考虑。
设计经验 发布时间 : 2023-10-21
【经验】解析如何用万用表测量电感?
电感怎么测量?LCR测试仪是一种采用交流方式测量电感、电容、电阻、阻抗等无源元件参数的装置。您可以使用是德科技U1733C LCR表完成电感测量。
设计经验 发布时间 : 2023-09-06
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提供是德(Keysight),罗德(R&S)测试测量仪器租赁服务,包括网络分析仪、无线通讯综测仪、信号发生器、频谱分析仪、信号分析仪、电源等仪器租赁服务;租赁费用按月计算,租赁价格按仪器配置而定。
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配备KEYSIGHT网络分析仪,可测量无线充电系统发射机/接收机线圈的阻抗,电感L、电阻R、电感C以及品质因数Q,仿真不同充电负载阻抗下的无线充电传输效率。支持到场/视频直播测试,资深专家全程指导。
实验室地址: 深圳 提交需求>
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