【经验】GDT放电管与MOV压敏电阻串联使用时是否导通在前?
在开关电源中,大家都知道GDT——陶瓷气体放电管通过是与MOV压敏电阻串联使用。那你知道他们之间谁先导通吗?
一般情况下大家都只了解到它们是在共模雷击时起到抑制雷击浪涌电压的一个作用,关于它们之间哪个先导通的问题都没人去深究,优恩半导体认为,要想知道GDT陶瓷气体放电管与压敏电阻哪个先导通,首先得了解它们的特性。
一、GDT放电管
GDT放电管一般采用陶瓷作为密封原料。它可以看成是一个电容很小的对称开关,正常工作状态下是关闭的,其极间电阻在兆欧级以上。其作用是限制浪涌电压,保护电路免受过压的损害。
GDT陶瓷气体放电管的参数:
1)反应时间是指从外加电压超过击穿电压到出现击穿的时间。GDT放电管的反应时间一般以微秒为单位。
2)允许功率负荷是指陶瓷气体放电管能够承受和耗散的较大能量,一般是8/20μs电流波形下能够承受及耗散的电流。
3)电容值是说在特定波形下(一般在1MHz频率)测得的GDT放电管两个电极之间的电容。GDT电管的电容很小,一般是≤1pF。
4)直流击穿电压是在陶瓷气体放电管上施加100V/s的直流电压时的击穿电压值。放电管产生火花时的电压即为击穿电压。 气体放电管有多种不同规格的直流击穿电压,优恩半导体有最高5500V、最低70V的。其误差范围:一般为±20%,也有的为±15%。其值取决于气体种类和电极间距等因素。
二、MOV压敏电阻
通过对比分析可知,压敏电阻的电容在1kHz时为210pF,而GDT放电管在1MHz频率时的电容为1-2pF。
如果在两端加上雷击浪涌电压,放电管和压敏电阻之间的电压就会除以寄生电容。GDT放电管与压敏电阻两个器件串联时,通常小容量的分压较高,大容量的分压较小,MOV压敏电阻的寄生电容是陶瓷气体放电管的百倍,因此绝大部分的电压会给到放电管,放电管导通之后,再施加到压敏电阻上,此时压敏电阻就会导通。在这种MOV压敏电阻和GDT放电管串联使用的电路应用中,响应时间是放电管和压敏电阻响应的总和。
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本文由玉鹤甘茗转载自优恩半导体官网,原文标题为:GDT放电管与其他元件串联时是否导通在前?,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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【应用】符合IEC 61000-4-5 Surge的AC36V电源端口浪涌&过压防护解决方案
AC36V电源广泛使用在工矿、船舶等LED电源,设备易遭受气候环境的影响而导致击雷击浪涌及过过压等损坏。本文推荐陶瓷气体放电管与压敏电阻串联搭配使用,可以延长压敏电阻的使用寿命及降低压敏电阻的漏电流,且后端的残压较单级防护降低很多。
【元件】UN3E3-XXXLSMD系列全方型外观结构的陶瓷气体放电管,更好用于通信、电力系统、医疗设备与工业等领域
优恩半导体UN3E3-XXXLSMD系列陶瓷气体放电管在设计采用了全方型的外观结构,这种设计不仅使得放电管在外观上更加美观大方,它在实际应用中也带来了诸多优势,如更便捷的安装与布局、更优化的电气性能、更高的稳定性,使其可以更好的应用于通信、电力系统、医疗设备与工业等领域。
DC24V电源端口浪涌保护
DC24V电源端口浪涌保护DC24V电源是一种为设备提供稳定、可靠的直流电压输出的电源,其广泛应用于工业自动化控制系统。此方案设计为多级保护的方式,初级采用通流能力较强的陶瓷气体放电管和压敏电阻组合来承受泻放大的浪涌电流,中间使用电感做退耦,次级选用响应电压精准、稳定且快速的TVS管做保护,能有效抑制各类浪涌过电压,使后端的DC芯片及电路得到全面的保护。
【技术】TVS管被击穿后的失效模式有哪些?
TVS(瞬态抑制二极管)可有效防护电路遭受瞬态浪涌电压及电流的危害。但它一旦被击穿,可能出现的现象一般有哪些?今天优恩半导体来为大家讲解。GDT放电管、TSS放电管、压敏电阻等电子元件是现如今在电子电路防护中用的比较多的几种过压保护器件,其应用领域十分广泛。
大功率TVS管在DC24V电源端口防护方案中的应用
DC24V电源广泛使用在LED、安防电源等行业,远距离户外传输,导致设备及易遭受雷击浪涌及过压等损坏,此方案采用UN公司经过多年经验积累开发出来大同流的TVS管,响应速度快、残压低,使后端的电路得到全面的防护。
优恩半导体(UNSEMI)ESD静电保护/雷击浪涌保护器件/串口芯片产品选型指南(英文)
目录- Company Introduction ESD Protection Diodes(ESD) Transient Voltage Suppressor(TVS) Thyristor Surge Suppressors(TSS) Sidac Thyristor(SIDAC) Metal Oxide Varistors(MOV) Gas Discharge Tube(GDT) Spark Gap Protectors(SPG) Micro Surge Protection Module(Micro-SPD) Polymeric Positive Thermal Coefficient(PPTC) RS485/422 Transceiver CAN Transceiver RJ45 Modular Jack connectors Small signal devices EMI Protection devices
型号- SMDJ-AT SERIES,UNS3K,07DXXKJ,UN2E8-XXXML SERIES,SMBJ,UN2E5-XXXLL SERIES,40DXXK SERIES,UN232,UN2E8-XXXL HV,4.0SMF SERIES,UN1812-XXXCSMD SERIES,10DXXKJ,5.0SMDJ-AT SERIES,P6KE SERIES,30KP SERIES,SACB SERIES,UNS1K SERIES,PXXXSC SERIES,P4KE,SMD0603 SERIES,10DXXK SERIES,10DXXKEC SERIES,UN490E,UN3E8-XXXHP,UNSDC12V-3L,07DXXK,07DXXL,UN3E5-XXXMSMD,20DXXK SERIES,PXXXSB,15KPS,PXXXSA,PXXXSB-2L,P4SMA SERIES,SA SERIES,SMAJ,UN2220 SERIES,05DXXKJ,SAC SERIES,SMF SERIES,PXXXSC,KXXXSA SERIES,20KP,5.0SMDJ SERIES,0402 SERIES,20KP SERIES,TPSMAJ SERIES,PXXXLB SERIES,SMCJ SERIES,UN3490,P4SMA,UNSDC24V-3L,SMDJ,UNS1K,UN3E6-XXXMM,UN65HVD75,UN2E8-XXXL HV SERIES,SMDT,UN1812 SERIES,UN3220 SERIES,1.5SMC,SA,UN2E8-XXXML,UNS4032 SERIES,UN2E8-XXXHL SERIES,UN2E5-XXXL HV,UNSDC58V-2L,SMD1210 SERIES,PXXXSD1,UN2E5-XXXLSMD,PXXXEC SERIES,UN3485,UN16,5KP,1.5KE SERIES,TP5.0SMDJ,14DXXL SERIES,07DXXKBC SERIES,UNS2K,UN2E8-XXXMSMD,UN2E5-XXXLL HV SERIES,10DXXKEC,UNSDC24V-2L,32DXXL SERIES,14DXXKJ SERIES,UN3E8-XXXHM SERIES,SMCJ,TPSMB SERIES,UN1210-XXXBSMD SERIES,UN3E6-XXXM,TPSMDJ SERIES,UN65HVD233,UN65HVD234,UN65HVD232,UN65HVD230,SMBJ-AT,UN2E5-XXXL,UN2E8-XXXM,UN1210-XXXBSMD,10DXXKJ SERIES,34SXX,KC SERIES,UN2E6-XXXLSMD SERIES,UN2E8-XXXH,UNB-XXXN-SMD,UN3E8-XXXHMF,32DXXKJ SERIES,UN1050,UN3232E,UNA-XXXM-SMD,UN1050ISODUB,PXXXG,32DXXKJ,40DXXK,UNS3220,UNB-XXXM-SMD,40DXXL,UN3085NE,SMCJS,UN2E8-XXXHSMD,TPSMB10J,32DXXK,32DXXL,PXXXEC,UN30,PXXXEB,PXXXEA,30KP,P6SMB SERIES,PXXXSC-2L SERIES,15KP,PXXXSC-2L,0603,SMD2920 SERIES,10SMBT,14DXXKJ,UN82C250,UNSRS485-2HL,UN82C251,10SMBJ,05DXXL SERIES,25DXXL SERIES,TPSMC SERIES,UN2H8-XXXL HV SERIES,UNSDC58V-3L,SM8Z SERIES,TPSMCJ SERIES,SM5Z,UN6,UN3E5-XXXL,UN3088E,KXXXG SERIES,PXXXTB,PXXXTA,UN2E5-XXXLSMD SERIES,KA SERIES,UNB-XXXN-SMD SERIES,UN3088ES,07DXXL SERIES,5KP SERIES,UN3485ISO,8KP SERIES,PXXXEA SERIES,UNA-XXXN/M SERIES,SMCJS SERIES,3KP,SM8Z,UN3E5-XXXLM,SMCJ-AT SERIES,LCE SERIES,UNC-XXXN/M SERIES,PXXXSA SERIES,UNSRS485-2H,SMCJ-AT,25DXXKJ SERIES,UN0805 SERIES,PXXXDM,POE58C,15SMBJ,PXXXTB SERIES,PXXXSB-2L SERIES,UNA-XXXN-SMD,40DXXKJ SERIES,UNS3220 SERIES,UN1206 SERIES,P4KE SERIES,SM5Z SERIES,UN2E8-XXXMSMD SERIES,UN3E6-XXXMM SERIES,05DXXK,05DXXL,UN600 SERIES,1012 SERIES,UNB-XXXN/M SERIES,8.0SMDJ,UNSRS485-2L,P6SMB,SACA SERIES,40DXXKJ,40DXXL SERIES,PXXXDM SERIES,SACA,UN0603 SERIES,SACB,UN2E5-XXXL SERIES,UN2H8-XXXLL HV SERIES,SMD2920,0402,8.0SMDJ SERIES,25DXXL,25DXXK,UN30 SERIES,10DXXL SERIES,20DXXL SERIES,25DXXKJ,5KPS,UNA-XXXN-SMD SERIES,UN485E,UN2E8-XXXHL,PXXXSB SERIES,UN485ES,PXXXTA SERIES,UN3E8-XXXHMF SERIES,UN2H8-XXXLL HV,SMDJ-AT,4.0SMF,SMF,TPSMB10J SERIES,0603 SERIES,5KPS SERIES,UN2E8-XXXH SERIES,KD SERIES,UN60,SMAJ-AT SERIES,TPSMDJ,UN1206-XXXASMD SERIES,UN2E8-XXXHSMD SERIES,UN3232E-T,UN1210 SERIES,14DXXKSC,07DXXKBC,10DXXK,UNSDC48V-2L,10DXXL,53DXXK,UN3E8-XXXHSMD SERIES,2012 SERIES,UN0805,UN3E5-XXXMSMD SERIES,KA,KB,UN1812-XXXCSMD,KC,TPSMCJ,UN2E8-XXXLL HV,KD,6.0SMAJ SERIES,14DXXKSC SERIES,UNS2K SERIES,10SMBJ SERIES,TP5.0SMDJ SERIES,SMD1812 SERIES,UN60 SERIES,5.0SMDJ,UN3490E,UNSDC48V-3L,20DXXKYC SERIES,SMD0603,SMD1812,KXXXSB SERIES,UN1206,UN16 SERIES,SMBJ SERIES,UNSRS422-2H,SMDT SERIES,UN1210,UNSRS422-2L,UN135 SERIES,TPSMBJ,PXXXLC SERIES,UNS4032,0201 SERIES,UN1206-XXXASMD,UN2H8-XXXL HV,5.0SMDJ-AT,UN3E5-XXXL SERIES,20DXXKYC,UN3485S,UN3E6-XXXM SERIES,34SXX SERIES,UN2E5-XXXLL,05DXXK SERIES,0201,UN3E8-XXXHP SERIES,UN3E8-XXXH SERIES,UN1042,UN3220,TPSMAJ,UN1040,UN2E8-XXXLL HV SERIES,15KP SERIES,8KP,UN2E5-XXXL HV SERIES,UN2E6-XXXLSMD,6.0SMAJ,UN3E8-XXXHSMD,32DXXK SERIES,34SXXJ SERIES,SMD1206 SERIES,SMBJ-AT SERIES,TPSMA SERIES,UNC-XXXM-SMD,LCE,UN600,14DXXK,UN6 SERIES,14DXXL,UNC-XXXN-SMD SERIES,UNSRS422-2HL,15SMBJ SERIES,SAC,SMD0805 SERIES,SMAJ SERIES,UN3E5-XXXLM SERIES,UN3E5-XXXLSMD SERIES,UN250 SERIES,UN3E8-XXXH,UN485CUA,UN488E,UN250,KB SERIES,PXXXLC,UN2E5-XXXLL HV,UN135,PXXXLB,PXXXLA,07DXXK SERIES,SMD1206,UN0603,UN1812,20DXXL,20DXXK,PXXXEB SERIES,10SMBT SERIES,1.5KE,14DXXK SERIES,UNC-XXXN-SMD,05DXXKJ SERIES,3KP SERIES,P6KE,07DXXKJ SERIES,UNS3K SERIES,KXXXSD1 SERIES,TPSMC,SMD0805,25DXXK SERIES,TPSMB,TPSMA6J SERIES,TPSMA,TPSMBJ SERIES,34SXXJ,20DXXKJ,SMD1210,20DXXKJ SERIES,SMDJ SERIES,UN2220,UN2E8-XXXM SERIES,TPSMA6J,UNSDC12V-2L,1.5SMC SERIES,15KPS SERIES,SMAJ-AT,PXXXLA SERIES,UN3E5-XXXLSMD
UN3E5 Series Double line Gas Discharge Tube
型号- UN3E5-250LSMD,UN3E5-300LSMD,UN3E5-350L,UN3E5-150L,UN3E5-470LSMD,UN3E5-XXXLM,UN3E5-600L,UN3E5-420L,UN3E5-420LSMD,UN3E5XXXLM,UN3E5,UN3E5-75L,UN3E5-150LSMD,UN3E5-75LSMD,UN3E5-90L,UN3E5-600LSM,UN3E5 SERIES,UN3E5-230L,UN3E5-230LSMD,UN3E5-250L,UN3E5-470L,UN3E5-XXXL,UN3E5-XXXLSMD,UN3E5-300L,UN3E5-90LSMD,UN3E5-350LSMD
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测试等级:空气放电30KV±5%;接触放电30KV±5%,适用标准:GB/T 17626.2、IEC61000-4-2、ISO10605、GB/T 19951;给用户产品出电路保护设计方案建议及整改。点击预约,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/上海 提交需求>
提供消费和车载电子静电摸底测试服务,测试接触放电和空气放电士20KV±20%,并将针对测试出的问题给出ESD整改方案。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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