【应用】金瑞电子PPTC热敏电阻用于LED照明中的过流和过热保护，具有低电阻和正温度系数特性

时间： 2022-09-15 来源：金瑞电子官网

技术问答

虽然许多高端LED驱动器件逐渐集成了过流、过热等保护功能，但在许多场合，特别是过热保护方面，仍然需要分立元器件方案作为协同保护方案，以使灯具具有更高的可靠性和更长的寿命。

PPTC是指高分子聚合物正温度热敏电阻，是由聚合物与导电粒子等构成，经过特殊加工后，导电粒子在聚合物中构成链状导电通路。当正常工作电流通过（或元件处于正常环境温度）时，PPTC呈低阻状态。当电路中有异常过电流通过（或环境温度升高）时，大电流（或环境温度升高）所产生的热量使聚合物迅速膨胀，切断了导电粒子所构成的导电通路，PPTC呈高阻状态。当电路中过电流（超温状态）排除后，聚合物冷却，体积恢复正常，其中导电粒子又重新构成导电通路，PPTC又呈初始的低阻状态。PPTC的体积小，成本低，可反复使用，实现了电路保护的自动启动和自动恢复。

在LED照明中，根据灯具应用场合的不同有不同的过热保护方式，通常分为两种。一种方式是达到规定温度立即启动关断保护（图4），此种保护通常应用于道路交通信号灯。另一种方式是到一定温度启动保护，进行降电流驱动（图5），此种保护通常应用于室内照明和道路照明。

图4：JK250，JK130系列产品用于交流LED照明系统的过流、过温关断保护。

图5：JK250，Jk130系列产品用于交流LED照明系统的过流、过温降电流保护。

深圳市金瑞电子材料有限公司针对LED照明应用开发了一款新产品。该产品在环境温度65℃下可以保证350mA电流正常通过，可在环境温度超过85℃时进行保护，通过合理设计、配置，可以分别以关断或调暗的方式对LED灯具进行保护。串并联相结合的巨型阵列照明或景观灯的过流和过热保护在成本与保护方案的相互平衡中，通常有两种保护方案可以采用。一是分路保护（图6）：对多串的LED系统，可以在每隔支路上串联一颗PPTC分别进行保护。这种方式的好处是可以实现精确保护，不会因为某一支路的故障而导致整个灯具的不工作，保护的可靠性好。二是主干路保护（图7）：这种保护就是在灯具的主回路上串联一颗PPTC，对整个灯具进行保护。这种方式的好处是成本低，占板面积小。

图6：LED阵列分路保护方案

图7：LED阵列主干路保护方案。

此外，PPTC可以作为温度传感器与LED驱动器配合使用，实现LED阵列照明的过热保护（图8），在大型阵列照明中，由于LED灯串众多且结构较为复杂，在实际应用中容易出现过热故障的位置，往往并不固定于某个特定的位置，因此单颗过热检测器件很难提供完善的过热保护。PPTC在正常工作下的低电阻以及正温度系数特性，可以方便地将数颗PPTC串联于热保护检测电路，实现多点过热监控。将多个PPTC串联、并安装于可能出现过热的部位。由于PPTC的低电阻，THRM引脚电平为0，电源电路正常工作。当灯具某处或多处发生过温故障时，THRM回路中的一颗或几颗PPTC受热，电阻急剧上升，THRM引脚电平变为高电平，从而启动LED驱动器设计的过热保护方案，实现过热关断或过热折减驱动。这种解决方案对LED面光源的过热保护而言经济有效。

图8：PPTC多热点过热保护方案的实现

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本文由Iris虹转载自金瑞电子官网，原文标题为:PPTC在LED照明中的过流和过热保护，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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目录- 公司简介瞬态抑制二极管静电保护器件半导体放电管气体放电管压敏电阻自恢复保险丝热敏电阻肖特基二极管整流二极管高压二极管稳压二极管场效应管霍尔传感器热保护器共模滤波器低压差线性稳压器

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选型指南 - 音特电子 - 2021/10/18 PDF 中文下载

金瑞电子（JK）PPTC自恢复保险丝选型指南

描述- 深圳市金瑞电子材料有限公司（简称金瑞公司）成立于2002年，是专业从事高分子PTC(简称PPTC)研发、生产、销售的国家级高新技术企业。金瑞公司拥有中国科学院金属研究所（沈阳）的技术背景，自主研发JK品牌的插件式，常规表面贴装，低阻表面贴装，圆环，条状式四大系列PPTC自恢复保险丝产品，产品型号有近1200个，耐压值有从6V到600V的各种产品。现在，JKPPTC产品覆盖了电子电器的众多领域。

型号- JK-P380,JK-NSMD350L-12,JKH30-050,JK-SMD0805-350L-12,JK-SMD0805-075L-12,JK-NSMD300L,JK60-025,JK-MSMD190L,JK250-020U,JK-NSMD050-30,JK-P260,JK-SMD0805,JK-MSMDL SERIES,JK60-030,JK30-090,JKH16-900,JK-MSMD075-33,JK-MSMD600L,JK16-1400,JK-NSMD050-24,JK-NSMD100-13.2,JK-SMD1210-035-30,JK-MSMD075,JK16-800,JK60-135,JK16-030(T),JK600-150U,JK-SMD0805-200L,JK60-017,JK-SMD1210-500L-12,JK-D170,JK-MSMD075-24,JK60-020,JK-D175,JK-SMD-0603-200L,JK-MSMD110-16,JK-SMD1210-450L-12,JK-SMD1210-175L-12,JK-SMD1210-350L,JK-SMD2920 SERIES,JK-MSMD500L-12,JK-MSMD500L,JK60-005,JK250-030U,JK60-250,JK30-075,JK60-010,JK60-375,JK-SMD1210L SERIES,JKH16-800,JK-MSMD050,JK16-1300,JK16-700,JK-MSMD850L,JK-NSMD650L,JK600-160U,JK-MSMD750L-12,JK-H1-4,JK-H1-2,JK-H1-3,JK-MSMD160,JK-MSMD450L-12,JK250-145U,JK-P180,JK-NSMD600L-12,JK-MSMD200-12,JK250 SERIES,JK-SMD0805-110L,JK-MSMD200-16,JK16-075(T),JK60-075,JK-SMD1210-050,JK-SMD-0603-300L,JK-SMD0805-010-24,JKH16-700,JK-SMD0603-050,JK-MSMD150,JK250-120U,JK-MSMD030,JK-SMD1210-175,JK-P175,JK16-200(T),JK-MSMD300L-12,JK-NSMD260L-12,JK60-065,JK-NSMD500L,JK60-185,JK-MSMD700L,JK16-600,JK-SMD0805-110L-12,JK-M900,JK-SMD0603-040,JK-SMD1210-200L-12,JK-H1,JK-MSMD260,JK-H3,JK-SMD1210-650L-12,JK-H2,SMD0805-010-24,JK-NSMD050-16,JK-MSMD020,JK-H9,JK-NSMD400L-12,JK-NSMD750L,JK-H8,JK-H5,JK-H4,JK-H7,JK-H6,JK60-050,JK-SMD0805-125L-12,JK-SMD1210-075,JKH16-600,JK-SMD1210-260L,JK-SMD0805-400L-12,JK-SMD1210-175L,JK-NSMD550L-12,JK-P070,JK-SMD1210-380L,JK-P190,JK-MSMD010,JK16-135(T),JK-MSMD014,JK-NSMD400L,JK-SMD1210-300L-12,JK-SMD0805-125L,JK60-160,JK-M800,JK60-040,JK-NSMD650L-12,JK16-500,JK-SMD1210-150L,JK30-800,JK-MSMD700L-12,JK□□□□□□-□,JK60-300,JK-M1000,JK-P300,JK-MSMD125,JK250-060U,JK-P420,JK-M270,JK-MSMD050-24,JK-NSMD600L,JK16-090,JKH16-500,JK-SMD1210-650L,JK-NSMD100,JK130-110,JK-MSMD110,JK-SMD1210-750L-12,JKH30-100,JK-MSMD014-33,JK250-180T,JK-M140,JK250-180U,JK-M260,JK-MSMD550L-12,JK-D210,JK-P SERIES,JK30-900,JK250-600U,JK-M175,JK-P200,JK600-110U,JK-SMD-0603-035L,JK-MSMD800L,JK130,JK250,JK-SMD1210-200L,JK-MSMD650L-12,JKH16-400,JK-SMD1210-190L-12,JK130-135,JK-NSMD200,JK130-017,JKH16-1000,JK130-015,JK-NSMD700L-12,JK-P550,JK250-1000U,JK-SMD0805-260L-12,JK-SMD0805-350L,JKH SERIES,JK130-010,JK-SMD1210-550L,JK130-250,JK-M190,JK-P100,JK-MSMD200,JK30-600,JK-SMD125L,JK-SMD1210-700L-12,JK250-040U,SMD0805-075,JK-MSMD SERIES,JK-SMD0603 SERIES,JK60-110,JKH16-300,JK-MSMD600L-12,JK-SMD100L,JK-SMD0805-175L,JK250-1200U,JK-P210,JK-P450,JK-MSMD125-8,JK-SMD0805L,JK-MSMD900L-12,JK-SMD0805-150L,JK250-800U,JK-NSMD050-13.2,JK-SMD0805-380L,JK130-200,JK30-700,JK16-050(T),JK-SMD200L,JK-NSMDL SERIES,JK-MSMD300,JK-SMD-0603-100L,JK60-200,JK-P120,JK-NSMD SERIES,JK250-050U,JK-SMD0805 SERIES,JK-SMD1210L,JK-MSMD110-24,JK-SMD0805-260L,JK-SMD300L-6,JK-MSMD260-16,JK-MSMD260-12,SMD0805-050,JKH16-200,JK-SMD1210-450L,JK16-110(T),JK16-900,JK-MSMD050-30,JK-MSMD190L-12,JK-MSMD800L-12,JK-P350,JK-MSMD260L,JK-SMD-0603-125L,JK-MSMD900L,JK-NSMD700L,JK-H3-2,JK-H3-3,JK-MSMD110-33,JK-NSMD150L,JK-NSMD380L,JK72-160,JK72-040,JK250-400U,JK-M550,JK-NSMD050,JK30-400,JK-NSMD075-13.2,SMD0805-035,JK-M430,JK-MSMD150-24,JK16-135,JK130-185,JK16-010,JK130-065,JK-SMD0805L SERIES,SMD0805-030,JK-NSMD260L,JK-NSMD500L-12,JK-SMD1210,JK-SMD1210-110-16,JK72-030,JKH16-1300,JK-NSMD175L,JK-SMD-0603-050L,JK-MSMD850L-12,SMD0805-020,JK30 SERIES,JK-SMD1210-500L,JK-M300,SMD0805-025,JK72-025,JK-SMD1210-110-12,JK-SMD1210-260L-12,JK130-075,JK-NSMD,JK-NSMD035,JK72-065,JK-M SERIES,JK72-185,JK-M450,JK-SMD-0603-075L,JK-NSMD150,JK-NSMD030,JK30-500,JK-SMD0805-110,JK-MSMD350L,SMD0805-010,JK600 SERIES,JK16-030,JK-SMD1210-350L-12,JK-P600,JK-M210,JK-SMD1210-600L-12,JK-SMD0805-175L-12,JK72-050,JKH16-1400,JK-SMD1210-380L-12,JK-SMD0805-100,JK-MSMD400L-12,JK130-090,JK-SMD0805-075L,SMD0805-005,JK16-025,JK-NSMD012,JK-SMD250L,JK130-025,JK-NSMD016,JK30-200,JK60-500,JK250-080U,JK-M350,JK-SMD-0603-150L,JK-MSMD550L,JK-NSMD010,JK16-050,SMD0805-110,JK-SMD1210-400L,JK-SMD1210-400L-12,JK-D,JK130-020,JK-H,JK-NSMD025,JK-NSMD175L-12,JKH16-1100,JK-NSMD450L-12,JK72-075,JK-SMD1210-075-24,JK-SMD0603L,JK-SMD-0603-175L,JK-SMD-0603-260L,JK-NSMD020,JK-NSMD750L-12,JK-SMD0805-300L-12,JK16-160,SMD0805-100,JK16 SERIES,JK-P730,JK-SMD1210-750L,JK130-030,JK-NSMD110,JK16-025(T),JK250-090U,JK-M370,JK30-300,JK16-075,JK-MSMD260L-12,JK-NSMD010-33,JK-D200,JK130-160,JK130 SERIES,JK-SMD1210 SERIES,JK130-040,JK250-2000U,JK-SMD1210-550L-12,JK-MSMD350L-12,JK-M,JK-NSMD005,JK-P,JK-M120,JK60 SERIES,JK-NSMD300L-12,JK72-090,JK-MSMD450L,JK130-050,JK-SMD1210-300L,JK16,JK-MSMD300L,JK-SMD185L,JK-SMD0805-050,JK30-120,JK-SMD1210-005,JK-SMD0603-010,JK30-250,JK-M950,JK250-100U,JK16-160(T),JKH,JK-SMD075L,JK-SMD0603L SERIES,JK72 SERIES,JK-SMD1210-010,JK-NSMD450L,JK-MSMD650L,JK16-1000,JK30-135,JK-M700,JK-SMD0603-003,JK-SMD1210-020,JK-SMD0603-005,JK-NSMD200L-12,JK-SMD0603-004,JK16-010(T),JK-SMD1210-150L-12,JK16-400,JK72-300,JK-SMD300L-16,JK-SMD1210-035-30V,JK-SMD0805-380L-12,JK-SMD260L,JK-NSMD380L-12,JK-SMD030L,JK-SMD200L-24,JK250-1500U,JK-SMD0805-075,JK-NSMD350L,JK-H SERIES,JK-M85

选型指南 - 金瑞电子 PDF 中文下载

【产品】符合RoHS规范且无卤素的表面贴装PPTC JK-nSMD（L），工作电流1.5~7.5A

金瑞电子推出JK-nSMD（L）系列表面贴装PPTC符合RoHS规范且无卤素，可以快速跳闸，1206尺寸，表面贴装，呈固态，工作电流：1.5A~7.5A，最大电压：6V/12V，工作温度：-40℃~85℃，具备CSA，UL，TUV认证。

产品发布时间 : 2023-01-31

JK-P300 PPTC热敏电阻产品规格书

型号- JK-P300

数据手册 - 金瑞电子 - 版本：A1 - 2022/9/5 PDF 中文下载

JK-SMD1206(L) Series PPTC of JK-nSMD (L) Series Surface-mount Devices

型号- JK-NSMD150L,JK-NSMD380L,JK-NSMD350L-12,JK-NSMD380L-12,JK-NSMD600L-12,JK-NSMDL SERIES,JK-NSMD300L,JK-NSMD400L-12,JK-NSMD750L,JK-NSMDL,JK-NSMD SERIES,JK-NSMD550L,JK-NSMD350L,JK-SMD1206L SERIES,JK-NSMD600L,JK-SMD1206 SERIES,JK-SMD1206L,JK-NSMD550L-12,JK-NSMD260L,JK-NSMD500L-12,JK-NSMD175L-12,JK-NSMD450L-12,JK-NSMD400L,JK-NSMD650L,JK-NSMD200L,JK-NSMD700L-12,JK-NSMD300L-12,JK-NSMD450L,JK-NSMD175L,JK-NSMD750L-12,JK-NSMD□□□L-□,JK-NSMD260L-12,JK-NSMD500L,JK-NSMD200L-12,JK-NSMD650L-12,JK-NSMD700L,JK SERIES,JK-NSMD150L-12,JK-NSMD,JK-SMD1206

数据手册 - 金瑞电子 - 2018/7/2 PDF 英文下载