【选型】锂电池CR123A供电智能家居产品过流保护器件选型推荐:自恢复保险丝1812L260,使设计满足EN60950

2020-05-22 世强
自恢复保险丝,1812L260,CR123A,Littelfuse 自恢复保险丝,1812L260,CR123A,Littelfuse 自恢复保险丝,1812L260,CR123A,Littelfuse 自恢复保险丝,1812L260,CR123A,Littelfuse

锂电池或者铅酸电池供电的产品,如果电池没有保护板,当系统短路时,若电池容量过大,就会引起电池爆炸,造成火灾危险。本文主要介绍了选择LITTELFUSE的过流保护器件PolySwitch 1812L260应用在锂电池CR123A供电智能家居产品上,使设计满足EN60950的安规要求。


根据EN60950标准 2.5 小节,受限制功率源应依从以下条件:输出受到固有的限制,应符合Table 2B限制;线性或非线性的阻抗输出也应符合Table 2B限制;若设计中使用PTC,所选PTC应通过IEC 60730-1第15, 17, J.15和J.17条规定的测试,或者符合IEC 60730-1对第2类设备的要求;使用过流保护设备的情况下,输出应符合Table 2C限制;若使用过流保护设备,则应该使用保险丝或不可调,不可自动恢复的机电设备。


笔者参与的智能家居产品采用3节CR123A电池并联供电,在电池并联的情况下,电池内阻变成单节电池的1/3,需要考虑系统短路一分钟后,电流避免大于8安培的情况;同时也要避开EN60950 4.7.2.1 中所要求的防火外壳;另外,EN60950 4.3.8 要求电池供电产品设计时应考虑减少火灾,爆炸等危险,包括电路内部故障和反极性安装等所造成的危险。因此要满足EN60950的安规要求,电池防反设计和过流保护设计必须考虑在内。由于机械结构设计上考虑了电池防反装置,因此原理图设计时为了节省成本,只加了过流保护设计。


通常电池供电的产品设计时过流保护器件会选用PolySwitch自恢复保险丝。PolySwitch是一种以传导性聚合物为基础的热敏电阻,具有正温度系数能力,阻抗随温度的增加而增大。选用Littlefuse的Polyswitch 1812L260,原理图设计如图1所示。该器件保持电流为2.6A,最大阻值为0.055欧姆,在系统正常工作电流情况下,对于电池电压的跌落影响很小,该器件已用于其它电池供电的产品上,且已经大批量生产,满足EN60950的安规要求。

图1 原理图设计


Littelfuse的过流保护器件根据封装尺寸有 Nano SMD, 0805L, LVR,1206L,2920L,1210L,1812L,2016L,30R,72R等,可根据产品设计需要选择不同封装尺寸的过流保护器件,选型参考指导如下:

  1. 确定产品应用的工作电压,工作电流,工作温度,封装要求。

  2. 根据温度递减曲线,查出环境温度下的保持电流折减比例,算出相应的保持电流。

  3. 根据计算的保持电流选择PolySwitch,要求选择的保险丝的保持电流大于计算的保持电流。

例如:该电池供电的智能家居产品,正常工作最大电流为1.2A,环境最高温度55度,工作电压3V,选1812L系列,根据温度递减曲线查出1812L在55℃时有70%衰减,那么Ihold=1.4/0.7=2 A。1812L260 保持电流为2.6A,满足需求。PCB布局如图2所示,电源走线从电池正极出来,经过1812L260,然后给系统供电。

       


图2  Littelfuse  1812L260 PCB布局


经过测试,电池电压经过1812L260,电压跌落几乎为0,可忽略不计。该产品已经通过CE认证且批量生产。

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型号- 30R135UU,72R300XF,1210L075/24PR,30R090UU,600R160-R1UR,1206L025YR,1812L,1812L350SL,1812L010/60DR,0603L050SLYR,2016L075/60,600R160-RAF,72R160XMR,0603L010YR,60R185XMR,1210L150TH,0805L110SLYR,16R1100G,1210L450SLWR,0402L050SLKR,0603L150SL,30R160UPR,1812L020PR,1206L110/12SL,2920L300DR,1206L175SLYR,72R090X,16R400GPR,16VT210SU,0805L260SLTH,1210L175WR,1812L200/12,LORHO,250S130¨CRCDR,30R300U,1812L200/16,16R1000GF,0805L100,16R250GU,20LR450,250R145-RA,2016L075/60MR,30R090,250R145-RAU,0402L020SL,2920L500/16,1206L260SLTHYR,1812L110/33MR,250S130¨CRC,250S130¨CRB,250S130¨CRA,16R135B,60R110XU,250S130V,2920L330/24MR,0603L075SL,0805L110,1206L175PR,250R145-RB,0603L,1206L012WR,16R500GU,24LT100,1812L150/12DR,1812L200/16DR,16R185BU,1210L380SL,600R160-RAUR,250S130¨CRBDR,30R800UH,15ST175U,250R145ZR,600R160F,16R1000G,16R110BPR,1206L380SLTHYR,16R250GPR,250R120-R3U,600R150-RA,600R150-RB,60R250,60R010,1812L075/33,250R120-R3,250R120-R2,250R120-R1,1210L200,1812L260/16MR,30R250UPR,72R135XMR,16R600GDR,1210L400SL,1206L300SLTHYR,30R700UMR,1206L450SL,250R120-RF,1206L200SLYR,250R120-RC,250R120-RA,0603L035YR,250R120-R2U,0603L175SL,1210L300SLYR,16R800GMR,60R375XH,16R110B,1812L190SLPR,16R1100GF,250R120TU,0805L075SLYR,16R1200G,250R120-RFZR,0402L,2920L200DR,2920L300,600R150F,2920L700SL,250R120-R1U,30R700UF,1210L075YR,2920L700SLPR,1210L110/16WR,60R110,1210L175SLYR,0805L010/24,16R600GU,2920L075/60MR,30R400U,60R050X,72R,60R,0402L010SLKR,72R090XPR,1206L050/15,1206L150SLYR,72R185XMR,2920L260PR,72R250XMR,1206L450SLWR,60R010XU,16VT210S,30R185,1812L075/24,1206L110SL,16R700GKLMR,1206L110TH,60R075X,LT SERIES,0603L100SLYR,1812L370SLPR,16R160BU,0805L110SL,60R025XPR,60R160X,0805L200SLTHYR,30R090UPR,2920L260/24,15LR380U,2920L,2920L185DR,16R500GPR,250R120T,60R090XPR,250R120U,30R300UU,1812L270SLPR,60R300X,1812L300SLPR,30R600U,72R075XU,0603L075SLYR,15LR260U,2016L,0402L020SLKR,06R075BU,06SL370GM,1206L075/16WR,1812L260SL,60R020XPR,20LR730,250R180MR,2920L330/24,06R155BPR,06SL190G,72R040XU,16R400G,1210L110THYR,2920L030DR,1812L160PR,2920L260/24DR,1812L075/33DR,1812L260TH,1210L035YR,1812L270SL,16R135BPR,1206L020YR,1206L075/13.2,30R250,0805L200SLTH,1812L050PR,600R150-RBF,0402L035SLKR,30R600UF,1210L350SL,16R300G,1206L075/13.6,72R075XPR,15LR260,15LR380,16R300GPR,30R185UPR,16R700GF,1812L014DR,60R160XMR,250R145U,0805L,1206L075SL,30R090U,2920L150DR,0805L050WR,1206L150TH,1812L200/12DR,0402L035SL,600R150-RAF,250R145T,1206L150SL,72R300XMR,1206L400SLWR,72R160XF,1812L150/24MR,30R500U,72R030XPR,2920L075DR,1206L075TH,1210L010WR,1812L350SLPR,LR,LT,1812L160/12DR,1812L150/24,60R025XU,2920L400/15MR,16R700GMR,0805L150SLYR,72R050XU,30R,16R1100GMR,60R010XPR,60R090,2920L200/24,1206L035YR,250R145-RBU,1206L050/15YR,16R800GF,1812L150/12,2920L400/15,VT SERIES,30R700U,1210L175SL,250R145TZR,0603L020YR,250S130¨CRADR,30R400UF,0805L300SL,1812L020/60,2016L050,1210L260SL,2016L050MR,16R250BU,1210L110/12WR,1812L010/60,06R120BPR,1812L075PR,30R400UMR,72R065XPR,60R135XF,SL SERIES,0805L010/24YR,16R250BPR,1812L370SL,30R160UU,20LR450U,0603L050SL,60R090X,1206L035/16,1210L020WR,1210L110/16,600R160-R1F,0402L010SL,250S130DR,60R185,24LT100U,72R020XPR,1206L150THWR,1210L380SLYR,1206L175SL,16R700GKL,72R300X,2920L050DR,2016L030,60R090XU,1210L110/12,2016L150,250R120ZR,16R185BPR,60R017XPR,1812L75/33,60R110XMR,1206L035/16YR,60R075XPR,60R025X,15ST175,250R180TMR,1812L150ZR,2920L050,1210L005WR,72R375X,1812L260THDR,1812L200THPR,72R050XPR,1812L125/16,12VL175XLU,0805L010YR,30R500UF,1812L75/24,16R700G,16R700GKLF,60R135X,2920L185,60R110X,1210L075,1812L160/12,16R900GF,1812L110,600R150-RBZR,600R,1812L125/6,60R040XPR,250R120-R1ZR,250R120-RFU,16R600G,2920L030,2920L150,30R800U,2016L100,1812L035/30DR,1812L075/24DR,16R135BU,250R120,30R185UU,SL,1812L010DR,2920L125PR,1206L200,1206L050YR,30R185U,ST,0603L150SLYR,1206L380SLTH,60R160XF,72R020X,30R600UMR,1812L300SL,60R050XU,0805L075SL,0805L260SLTHYR,72R250X,06SL370G,30R300,2016L075/060,1210L175,72R020XU,1812L260SLPR,250R180TF,16R1400GH,16R090BU,250R120-RAZR,0805L150SL,1812L050/30PR,30R160U,1210L260SLYR,60R065XPR,0805L020YR,1210L,1206L350SLTHYR,60R017X,1206L075SLYR,1206L110THYR,72R040XPR,2920L250DR,30R500,1210L110TH,1812L110/24DR,250R120-RCU,2016L200,0603L050YR,0805L300SLWR,1812L200,06R155BU,72R250XF,250R145,60R017XU,1812L020/60DR,1812L035/30,0603L050,1812L125/6PR,30R400,1206L400SL,60R030XPR,1210L350SLWR,60R300XF,VL,1206L260SLTH,06R120BU,72R065XU,1812L300MR,1210L400SLWR,VT,1210L450SL,16R,2920L500/16MR,1206L300SLTH,2920L075,250R120-RAU,72R030XU,250S130-RC,250S130-RB,16R110BU,250S130-RA,1812L300,2920L100PR,250S130,30R110UPR,30R250U,1206L110/12SLYR,0805L175SLYR,72R135X,0805L075WR,1206L016,16R500G,1206L150/12SL,0603L175SLYR,30R250UU,30R900U,16R900GMR,72R185XF,16R090B,1206L012,1206L075/13.2WR,600R150-RAZR,72R110X,1210L075/24,72R025X,0805L050,60R065XU,72R075X,1210L300SL,72R160X,0603L020,250R080ZR,72R090XU,1210L200SLYR,250R120TZR,60R185X,0603L025,0805L100WR,06R120B,2920L200/24DR,250R180,30R135U,60R040X,1206L025,06SL190GM,600R160-RA,72R135XF,06R075BPR,1206L020,1210L005,600R160UR,250R145-RBZR,12VL175XL,6

LITTELFUSE  - 选型指南 代理服务 技术支持 批量订货

竞沃电子将参加2024中国宁波(华东)智能家居创新峰会

本次智能家居技术创新峰会将设立第46届(宁波)AIoT&智能照明与驱动技术研讨会、第四届(宁波)家电电源与智能控制技术研讨会两大论坛,将对LED驱动电路设计与优化、开关电源设计原理与优化、智能家居安全与隐私保护、电源设计方案、智能控制算法、智能灯控中的传感器和先进控制器等前沿技术的研究及应用案例等技术话题进行深入的研讨。

2024-06-22 -  原厂动态 代理服务 技术支持 批量订货

Littelfuse多种汽车电子保护器件,助力实现稳健的车载通信

本文介绍了多种汽车电子保护器件,包括TVS二极管阵列、瞬态抑制二极管、ESD抑制器和自恢复保险丝,旨在提高汽车系统的安全性、便利性和舒适性。

2024-04-14 -  原厂动态 代理服务 技术支持 批量订货

【选型】Littelfuse(力特)保险丝座选型指南

目录- Fuse Characteristics, Terms and Consideration Factors    Fuse Selection Checklist    PTC Characteristics and Terms    PTC Product Applications    Typical PTC Circuit Protection Designs    Fuse Standards    Fuse and PTC Products Selection Guide    Fuse Packaging and Part Numbering   

型号- 1812L,471,230,472,473,232,233,234,235,477,874,875,876,239,877,2016L,461E,485,LORHO,400,157T,369,804,807,808,600R,437 SERIES,USBR,370,251,372,373,494,253,374,2205,SL,0603L,0805L,ST,382,262,383,263,385,265,266,267,268,269,303,429,1210L,LR,LT,391,1206L,392,272,273,274,395,154,275,396,397,398,157,278,399,219XA,279,312,950,313,30R,159,314,435,315,437,438,318,LORHO PTC,160,285,440,250S,441,250R,322,443,202,203,324,VL,325,446,326,447,448,449,208,209,VT,16R,451,452,332,453,154T,454,213,456,215,72R,216,458,60R,217,459,218,977,460,461,220,462,464,465,224,466,225,467,468,501,469,229,505,506,2920L,508

LITTELFUSE  - 选型指南 代理服务 技术支持 批量订货

自恢复保险丝(PTC)的ITRIP电流的意义是什么?

Itrip可以叫做跳变电流,就是指电流超过该值时,电阻会出现大幅增加。其作为自恢复保险丝特有的重要参数,在设计选型时要格外重视。

2017-09-26 -  技术问答 代理服务 技术支持 批量订货

1812L Series Surface Mount

型号- 1812L SERIES,1812L,1812L075/33,1812L160/12DR,1812L150/24,1812L010/60DR,1812L260/12MR,1812L035/60,1812L160,1812L260/16MR,1812L110/24DR,1812L150ZR,1812L035/60MR,1812L260THDR,1812L200THPR,1812L125/16,1812L380/12THYR-A,1812L110/33,1812L020PR,1812L035/30,1812L020/60DR,1812L150/12,1812L125/6PR,1812L150/16,1812L200/12,1812L200/16,1812L160/12,1812L300MR,1812L020/60,1812L110,1812L075,1812L050/60MR,1812L125/16DR,1812L160PR,1812L260TH,1812L075/33DR,1812L150,1812L125/6,1812L010/60,1812L110/33MR,1812L260/16,1812L075PR,1812L050/30,1812L050PR,1812L110/24,1812L260/12,1812L300,1812L035/30DR,1812L075/24DR,1812L010DR,1812L020,1812L014DR,1812L110PR,1812L110/16,1812L150/16DR,1812L075/24,1812L200/12DR,1812L050/60,1812L150/12DR,1812L200/16DR,1812L050,1812L110/16DR,1812L150/24MR,1812L014,1812L010,1812L200TH,1812L050/30PR

11/29/23  - LITTELFUSE  - 数据手册 代理服务 技术支持 批量订货 查看更多版本

功率涵盖200W~15000W!TVS瞬态抑制二极管制造商音特电子授权世强硬创代理

音特电子授权世强硬创代理旗下ESD静电保护元件、PPTC自恢复保险丝、TSS半导体放电管、SBR肖特基二极管等产品,其中,TVS瞬态抑制二极管作为主推产品之一,功率涵盖200W~15000W!

2023-04-21 -  签约新闻 代理服务 技术支持 批量订货

在伺服驱动器的预充电电路中,采用可控硅做软起动控制,其驱动采用变压器驱动,由于在实测时发现变压器存在磁芯饱和而电流短路的情况,所以希望能找一款过流保护器件?

可控硅驱动采用变压器驱动,脉冲变压器如果磁芯饱和就会有电流短路的情况,推荐采用littelfuse的自恢复保险丝PTC,型号0805L050WR和 0603L020YR,响应时间0.1ms,可以实现可靠地保护。

2018-04-28 -  技术问答 代理服务 技术支持 批量订货

LFPCN# 41490:Product End of Life Notification for 4 Low Rho SMD PPTC Part Numbers

型号- 1210L175SLYR,1210L380SLYR,1812L370SLPR,1812L350SLPR,1812L260SLPR,1812L270SLPR,1210L200SLYR,1210L400SLWR

September 26, 2023  - LITTELFUSE  - 产品变更通知及停产信息 代理服务 技术支持 批量订货

里阳半导体(Liown)汽车行业保护器件选型指南

目录- 公司简介    产品概述    汽车瞬态干扰相关标准    汽车AEC-Q101测试标准    汽车电子架构及保护器件应用   

型号- SMBJ5.0A,SM6S24A,SMCJ440A-Q,2R090MM-8,30KP-Q,SM8S33A,SMBJ6.5A,15KP36A-Q,5KP-Q,SM6S,SMCJ75A-Q,5KP36A-Q,SMBJ6.5CA,15KP-Q,SM8S30A,2R075ML-8,5.0SMDJ36A-Q,561KD20J,LTHXXA-YYBWGH,5.0SMDJ-Q系列,5KP33A-Q,SM8S系列,220KD10,220KD10J,20KP-Q,SMCJXXA,2R090ML-8,5KP24A-Q,SMBJ7.0A,180KD10,15KP30A-Q,5KP系列,5.0SMDJ-Q,SM8S,180KD10J,5.0SMDJ24A-Q,5KP,15KP20A-Q,SMBJ7.0CA,15KP24A-Q,15KPXXA-Q,SMBJ6.0A,SM8S20A,SM8SXXA,SMBJ30CA-Q,2R075MM-8,5.0SMDJ75A-Q,2R800ML-8,SMBJ16CA,SMBJ6.0CA,SM8S24A,SM8S36A,SM6S系列,P6SMAJ33CA-Q,SMBJ5.0CA

2022年08月  - 里阳半导体  - 选型指南 代理服务 技术支持 批量订货
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