【经验】UPS软起方案中应用水泥电阻的问题和使用PTC的优势

时间： 2020-10-28 来源：世强

技术问答

一、软起电路描述

母线软启动电路的作用是在UPS上电开机进入正常工作状态之前将双母线或者单母线电容充至接近电池电压或接近市电峰值电压。如果没有软起电路，闭合市电主继电器或电池主继电器瞬间会产生短路电流，造成器件损坏。

图1、USP母线软起电路结构

二、水泥电阻在软起电路中存在的问题

在10kwUPS项目中以及目前市面上的主流UPS和光伏逆变器大多使用水泥电阻进行被动软起，使用水泥电阻作为软起的主要原因是水泥电阻软起方法简单、可靠性高。但是在目前的UPS上使用水泥电阻作为软起方案存在以下三个问题：

1、软起时间长大概在0.1S～1S之间(如：R=400Ω，C=800uf, T=RC=0.32s)。加上辅电源启动，LCD屏幕正常工作整个过程大概需要至少10S，不满足客户快速开机的需求。

2、水泥电阻软起在生产工厂在及市场上有着火的案例，母线软起电路过流，导致水泥电阻着火，严重时会使整个机器乃至使放UPS的机房发生火灾。

3、传统的水泥电阻软起电路，当母线短路的情况下，用电池进行软起，软起继电器触点无法脱开，导致电池持续放电，电阻持续升温，最终烧坏。

三、PTC电阻软起方案介绍

针对USP上使用水泥电阻软起方案的替代，推荐国产硕凯电子 SC600-200 PTC自恢复保险丝，它主要应用在电路保护，适用于不断受过流条件后损坏的场合。PTC在故障电流下的自我恢复能力，使其适用于用户或者技术人员接触不到的电路，或者是需要恒定正常运行的电路，PTC应用在UPS软起电路中有哪些优势，如何实现电路保护，本文介绍关于PTC在10kwUPS电源项目中的应用案例，将根据以往研发项目和日常技术支持中的体会，总结了一些经验，供读者参考。

硕凯电子SC600-200 PTC母线软起方案

图1中 UPS母线软起电路中使用2PCS Socay SC600-200 PTC，器件位号为R1、R2。软启电路输出挂接在市电整流桥之后。市电软启时，都是通过单相市电软启。软起电路采用Socay SC600-200 PTC方案，电路结构上通过对顶二极管的设计，防止振动环境下或电池（或）软起继电器粘连时市电与电池直通，软件误判反灌关机。UPS辅助电源上电后，如果市电电压满足要求，在市电过零点附近闭合市电软起继电器，通过母线电压采样母线电压上升至输入电压90%后闭合主继电器。如果市电异常，则闭合电池软起继电器，通过电池进行软起。

PTC在软起电路中的优势

Socay PTC 型号为SC600-200应用在软起电路中相比普通水泥电阻具有以下几点优势：

1）可重复使用，切断电源和排除故障后，自动恢复为正常状态，不会损坏器件。

2）短路保护，当母线短路,频繁软起母线时，PTC电阻流过电流，PTC本体温升不断上升，达到动作温度后，阻值增大呈开路状态保护电路。

3）性能优越，除过流保护，还能抗浪涌电流对电路的损害，能在未形成故障前就保护电路。

4）提升产品质量可靠性，能大大降低成品的自然损坏率,能大大延长产品的使用寿命，使产品更加稳定可靠，避免母线短路时故障扩大。

5）降低成本，PTC具有温度保护功能，可以选择阻值小的电阻，如硕凯SC600-200减少元件数量、PCB面积、作业过程损坏及附加成本；并能提高生产效率、降低不良率。

6）效率提高，能提升研发人员的设计效率和保护额准确性和可靠性，降低了运维成本和一些隐性成本。

7）缩短软起时间，持阻值恒定，PTC具有温度保护功能，因此可以选取阻值小的PTC，缩短母线软起时间。

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型号- 40D271K,P4SMA16A,SMAJ6.0CA,SMAJ40CA,SC3E6-300MM,SC30 SERIES,30KPA170CA,SMF10CA,KD-012,SCF035-30-1206R,SC2E6-350LSMD,5.0SMDJ170A,SCF1210,8.0SMDJ24A,SC3E5-600LM,SMDJ78CA,RCF300-1812R,SC3E8-150HMF,KD-015,SCGB-H SERIES,KD-025,KD-020,SCGB1005-B SERIES,SCF1206,5.0SMDJ300CA,SC3E6-420MM,1.5SMC13CA,SMCJ14CA,P4SMA18A,TH8S15CA,SCPB4516S600WTF,5.0SMDJ85A,SC2E8-2500LL,P4SMA16CA,SC2E8-250HL,SMCJ100CA,SC2E8-1600LL,20KPA48CA,53D112K,34S210K/40,SMBJ300A,5KP30A,SMF120CA,SMBJ150CA,SMDJ170A,8.0SMDJ26A,SCPB1608S301NPF,SMAJ70A,P4SMA520A,53D681K,SCF050-24-1206R,3KP80CA,SMDJ58A,32D122K,SA48CA,SMCJ30A,SC2H8-5000LL,SCGB1608H200HPF,SCGB1608H301EPF,SA180A,SCPB1068W471LPF,SMF190A,SA22CA,SCF110-1812,P6KE8.2CA,SMAJ100A,SC250-600,8.0SMDJ20A,SCF160-16-1812R,P4KE180A,5.0SMDJ170CA,SC2E8-250ML,SA110CA,30KPA54CA,P4SMA82CA,SC3E5-230LM,SMF3.3A,SMDJ54A,30KPA198A,SMDJ160CA,3KP14CA,20KPA180A,SMBJ400CA,5KP SERIES,SMF36CA,SCPB2012W221NPF,SMCJ80CA,SCF260-1812R,SCWL201610G-2R2ML,SC600,PXXXXLB,PXXXXLC,PXXXXLA,P6SMB51CA,P4KE22CA,53D241K,SMCJ220CA,8.0SMDJ22A,32D561K,SCPB4532S601QTF,SCWL201610H SERIES,TH8S28CA,15KPA40CA,5.0SMDJ80A,P4KE SERIES,1.5KE51A,SM6S SERIES,1.5SMC39CA,SM6S12A,SC3E8-800H,SC2E5-420LL,P6SMB,SA70CA,1.5KE36CA,SCF0805 SERIES,1.0SMBJ,TH8S33CA,15KPA100A,5KP36A,SCF150-1812R,SCA-601M,P6SMB16A,30KPA,SMAJ18CA,SA17CA,1.5KE170CA,SM6S11A,5KP90CA,SMF,SMDJ51A,3KP45CA,3KP140CA,P4SMA170A,TH8D33CA,P6SMB15A,SCGB3216S121丨TF,P4SMA10A,3KP58CA,SCGB3216S122HTF,1.5KE56A,SC2E8-75HSMD,1.5SMC440A,P6SMAJ,SC2E5-2700DL,SC2E6-90LSMD,SM6S14A,P6SMB520A,SA5.0CA,SCF160-1812,SM2KBF SERIES,SC2E5-300LL,5KP24CA,SCML2016G4R7MBE,SC2K8 SERIES,P6SMB16CA,P4SMA11A,SM6S13A,P6KE500A,SMBJ90A,SMF64A,SCPB2012S400RPF,SMBJ12CA,P6SMB13A,P4SMA12A,SCPB3216W121QTF,PXXXXSA SERIES,SM6S16A,SC2E8 SERIES,SC2E6-600LSMD,SC1812-420CSMD,P6SMB12A,TH8D20CA,SCF012-1206R,32D911K,P4SMA13A,SC2E6-420LSMD,P6KE180CA,P6SMB10A,SCGB2012S301HPF,SM6S15A,P4SMA47CA,SCML2012H2R2M05BP,P6SMB11A,KA-190,25D SERIES,P6SMB100CA,5.0SMDJ78CA,SC250-650,SCWL201610G-1R0ML,15KPA18CA,20D,P4KE400A,SCML2012H1R0MBE,SM6S18A,RCF160-1812,PXXXXTB SERIES,1.5KE10CA,SCF035-0805R,SCHB1608W241EPF,SC1206-90ASMD,34S850K/40,SMF60A,P4SMA15A,SCGB2012S102FPF,15KPA30A,SM6S17A,P6KE27CA,30KPA84A,SCB-141N,PXXXXEC,5KP33A,PXXXXEA,P6SMB82CA,PXXXXEB,15KPA180CA,SC2E8-150H,1.5SMC500CA,SC2E8-150M,5KP11CA,30KPA36CA,P4KE6.8CA,20KPA52CA,P6SMB47CA,1.5SMC250CA,SCHB1608-W SERIES,SCPB1005S100NPF,TH8S15A,SC3E5-75LSMD,P6SMB220CA,3KP140A,SC2E5-470L,SMDJ200CA,SMF70A,SMDJ190CA,15KPA24A,30KPA90A,1.5KE380CA,SC250-145T,3KP64A,P4KE20A,SMAJ48CA,SMBJ43CA,TPSMAJ SERIES,SCWL201610G-R47ML,53D SERIES,34S140K/40,SMCJ7.5A,SMAJ400A,SC1812-400CSMD+,30KPA71CA,SMF19CA,SA90A,30KPA102A,SMBJ18A,SCF035-1210R,1.5SMC75CA,25D,SMAJ300CA,P6KE220CA,SA40CA,SCF020-60-1812R,SCB-501M,15KPA22A,SC1812-350CSMD,TH8S16A,KA-170,SMBJ19A,SCGB3216S202ETF,20KPA96CA,SM6S20A,3KP9.0CA,S61089,SM6S,P6KE100CA,SMBJ16A,20KPA240CA,SMBJ30CA,P6SMB SERIES,SCWL252010H SERIES,5KP28A,SCGB1608H121EPF,30KPA108A,SMF110A,15KPA28A,SMAJ8.5CA,SC1210-420BSMD,SMAJ180A,P4KE100A,SC135-650,SCC-471M,SMBJ17A,SMF85CA,SMBJ120CA,5.0SMDJ220A,SM5S,SM8E,SM8S16CA,SM6S22A,20KPA120CA,5KP8.0A,1.5SMC10A,SC2E5-3500D,SC3E6-230M,3KP75CA,SMBJ14A,SM8S,P6SMB18A,SMDJ16CA,SCGB1608S221FPF,SMBJ130A,1.5SMC130CA,5.0SMDJ350A,SCPB1608S601LPF,15KPA26A,15KPA48CA,SMDJ440CA,34S350K/40,5KP120CA,SCGB1005S200FPF,SA100A,SMBJ15A,SCF125-2920R,SMAJ170CA,KA-133,SCWL252010G-R47ML,15KPA180A,30KPA260CA,SMBJ12A,SMAJ6.0A,P6KE62CA,SC3E8-150HP,SC250-1000S,TPSMEJ,SC3E8-150HM,1.5SMC91A,SA7.5CA,5.0SMDJ78A,SMCJ7.0A,SMDJ51CA,15KPA22CA,5.0SMDJ48CA,SMBJ13A,SCBE-471M,SC2E8-150MSMD,TPSMDJ,P6KE75A,P4SMA220A,KB-380,34S440K/65D,SMCJ150A,20KPA172A,SC1210-350BSMD,SC1812-90CSMD,TPSMCJ,SA6.0A,SCF200-1812R,5KP8.5A,SMAJ78A,KA-100,SC3E8-800HM,5KP120A,SC3E8-800HP,SMBJ10A,SMBJ11A,P4KE27A,5.0SMDJ400A,SMAJ22CA,SC3E5-350LM,TPSMBJ,SMCJ6.5CA,8.0SMDJ22CA,SMAJ75A,SMCJ36A,SA190CA,SCPB1005S121MPF,SM4KBF,5.0SMDJ75A,P4SMA9.1A,TH8S SERIES,SMF54CA,SC30-600,P4SMA91A,TPSMAJ,1.5KE100A,SC2E8-250MSMD,P6SMB170A,SMCJ45CA,3KP60A,30KPA84CA,SC3E5-470LM,P6KE75CA,TH8D28CA,P4KE24A,SCF030-1812R,SCPB3216S121WTF,SC16-600,SCA SERIES,SCGB1005S600FPF,SC3E5-150L,SMAJ6.5A,SMBJ440A,SMCJ58CA,SMDJ7.5CA,5.0SMDJ17CA,1.5KE18CA,5KP60CA,5.0SMDJ70CA,SMCJ33A,P4SMA350A,RCF260-1812R,SCGB3216S700KTF,SCF0805,P4KE22A,P4SMA6.8CA,10D SERIES,P4KE6.8A,SA6.5A,5.0SMDJ33CA,SA36CA,SMBJ,SMDJ20CA,SMF6.0A,P4SMA15CA,3KP6.0CA,SMDJ160A,3KP26CA,SCWL201610H-R47ML,SMAJ60A,SMAJ,SC2E8-75ML,5.0SMDJ70A,5.0SMDJ SERIES,SMF22CA,SMDJ48A,SMCJ7.0CA,SMCJ20A,P4KE36CA,SCF260-13-1812,P6KE200A,SMDJ,20KPA36CA,SC1206-470ASMD,SMBJ85A,1.5KE380A,P4KE120CA,P4SMA400CA,SCPB1608S600QPF,SC2K8-400SMD,SMF180A,SM8E43A,SMCJ,SM8S22CA,SMDJ33CA,SMDJ45A,1.5SMC8.2CA,SCC-401M,SMCJ13CA,SCB-201M,TH8S16CA,PXXXXSB SERIES,SMDJ64CA,3KP13CA,5KP180CA,SCWL252010G SERIES,1.5KE62A,20KPA26A,SCF020-0805R,20KPA104CA,PXXXXLA SERIES,SMCJ26CA,SA75A,TH8D,20KPA24A,TH8S,SMDJ43A,1.5SMC91CA,SCHB1608W601EPF,1.5SMC180CA,20KPA300CA,SCPB-S SERIES,1.5KE250A,SCF012-0603R,SA78A,53D361K,SMAJ85CA,P4SMA200A,SA190A,K1-076,1.5KE8.2A,2

选型指南 - 硕凯电子 - Ver Feb.2019 - Feb.2019 PDF 中文下载

湍流电子GDS系列导热绝缘片助力解决严苛环境下的新能源汽车发热需求，超强的抗撕裂强度（拉拔力＞40N）

在新能源行业，包括汽车、储能、光伏逆变器等应用中，高电压大电流已经成为行业发展的趋势，电流流过之处，即是导热和绝缘需求诞生之地。不论是为了提升电池性能而采用PTC进行主动发热，亦或是因为MOSFET、IGBT及各种电子元器件运行过程中的发热，都需要快速高效地使用有效手段传递出去。

产品发布时间 : 2024-08-13

芯进（CrossChip）磁传感器/隔离/驱动/IC选型指南

目录- 企业简介磁传感器隔离产品驱动产品通用IC

型号- CC6103E,CC6203,CC6201,CCI8741EHS,CC6115B,CC6402A,CCH477,INK1102,INK1105,CCI8740EH5WH,CCI8740EL3WH,INK1101,CC6213,CC6401E,CC6212,CC6207E,CC6210,CC8110,CC6130B,CC6207M,CC6211E,CCI8742ELS,CC6102R,CC6401S,CCI8741EL3WH,CC6209,CC6206,CCH477E,CC6207,CCI8741,CC6204,CCI8741EH5WH,CC8108,CCH477G,CC6205,CC6103,CC6104,CC6500,CCH890,CC6101,CC6102,CC6105B,CC6921B,CC7031,CCH891,CC6105R,CC6215,CCI8740ELS,CCI8742EL3WH,CC6115,CC6511,CC6112,CC6111,CC6403A,CC6920B,CCI8742EH5WH,CCI8332-2L8W,CC6201E,CC6905,CC6906,CC6903,CC6404A,CC6904,CC6902,CC6503,CC6504,CC6900,CC6105,CC6501,CC6502,CC6401,CC6121,CCI8741ELS,CC1108,CCI8740EH3WH,CCI8740EL5WH,CC6407C,CC6411,CC6533,CC6412,CC6531,CCI8742EHS,CC6410,CC6130,CC6925,CCI8741EL5WH,CC6926,CC6409,CC6923,CC6924,CC6407,CC6921,CCI8741EH3WH,CC6404,CC6922,WS2801,CC6402,CC6920,CC6403,CC6422,CC6541,CC6420,CC6421,CC6533B,INK1003,CC6419,CC6538,CC6417,CC6418,CC6536,CC6415,CC6537,CC6416,CC6930,CC6413,CCH284,CCI8740EHS,CC6411A,CC6430,CC6407E,CC6407S,CCI8742EH3WH,CCI8742EL5WH,CC74ACT244,CC74ACT245

选型指南 - 芯进电子 - V2 - 2023/10/20 PDF 中文下载

WAYON自恢复保险丝选型表

WAYON（维安半导体）提供自恢复保险丝选型：IH @25℃（A）:0.01-14，IT @25℃（A）：0.05-23.8，Vmax（V）：6-600，Imax（A）：1-100，Rmin（Ω）：0.0005-70，Pd Typ（W）：0.26-4.6.

Max Time to Trip Current（A）

Max Time to Trip Time （S）

选型表 - WAYON 立即选型

MZ3-2-56ROH 抑制浪涌用PTC热敏电阻器承认书（MZ3-2-56ROH PTC THERMISTORAS INRUSH CURRENT LIMITER APPROVALREQUEST）

型号- MZ3-2-56ROH,MZ3C13X356RH440L

数据手册 - 硕凯电子 - 版本 A - 2024.6.12 PDF 中英文下载

硕凯PPTC(贴片保险丝)选型表

提供硕凯电子PPTC自恢复保险丝选型，PPTC作为过流电子保护元件，采用高分子有机聚合物在高压、高温，硫化反应的条件下，掺加导电粒子材料后，经过特殊的工艺加工而成。相对传统保险丝硕凯PPTC自恢复保险丝具备过流过热保护，自动恢复双重功能。硕凯PPTC 具备多工作电压电流可供选择，可提供0603封装-2920封装纯贴片自恢复保险丝，工作电流从10ma-10a,工作电压从6V-60V，满足客户各种情况的需求！

产品型号	品类	封装	I hold(A)	I trip(A)	V max(Vdc)	I max(A)	P dtyp.(W)	Current(A)	Time(Sec.)	R min(Ω)	R max(Ω)
SCF005-0603R	Surface Mount Resettable PTCs	0603	0.05A	0.15A	15V	40A	0.5W	0.5A	0.1s	3.8Ω	30Ω

选型表 - 硕凯电子立即选型

瞻芯电子隔离型、单通道栅极驱动芯片IVCO1A0x获车规级认证，为汽车电子应用提供高可靠、高效率支持

日前，瞻芯电子的隔离型、单通道栅极驱动芯片IVCO1A0x系列4款新产品通过了车规级可靠性认证（AEC-Q100）。该系列芯片将在工规级产品基础上，新增4款车规级型号，为车载功率变换系统提供高可靠性、高效率的支持。

厂牌及品类发布时间 : 2023-06-09

【方案】高效率10kw三相光伏逆变器优选元器件方案

描述- 本方案通过采用WOLFSPEED高效SIC肖特基二极管，Vincotech MNPC T字型逆变IGBT模块及相关的器件，相比于分立器件方案，集成度高且寄生参数小，模块效率更高。

型号- C4D10120D,T-FLEXHD300,SMBJ,BGM111,LXS,SMDJ,C2M1000170D,1812L,SLM750,SLM152,SC92,PS9402,TGARD500,30R,RBN40H125S1FPQ-A0,EFR32MG,PS9031,60R,LSIC2SD120E10CC,SMAJ,SMCJ,WDU,SMF,SI4438-C,WGM110,MKP,MLX91210,10-FZ12NMA040SH-M267F,2920L,BVS,EFM32JG,SGM2019

优选器件方案 - ISABELLENHUETTE,WEIDMUELLER,LITTELFUSE,LAIRD,SILICON LABS,WIMA,CREE,NIPPON CHEMI-CON,MEIG,RENESAS,VINCOTECH,WOLFSPEED,ROGERS,MELEXIS,SGMICRO - V1.2 PDF 中文下载

SCF0603RB Series Surface Mount Resettable PTCs

型号- SCF020-0603RB,SCF003-0603RB,SCF004-0603RB,SCF010-0603RB,SCF040-0603RB,SCF050-0603RB,SCF005-0603RB,SCF001-0603RB,SCF002-0603RB,SCFXXX–0603RB,SCF035-0603RB,SCF0603RB SERIES,SCF025-0603RB,SCF030-0603RB

数据手册 - 硕凯电子 - Revision January 6, 2021 - January 6, 2021 PDF 英文下载查看更多版本