浪涌抑制的选择

shuszhao

<div style='margin: 0px 0px 10px; padding: 0px; text-align: justify; color: rgb(100, 100, 100); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: myFont, "Microsoft YaHei"; font-size: 16px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);">前几天，有位AVX的FAE特意过来和我交流MOV的运用，我这里一方面是做旧文回顾，第二个也是初步写一写，在选择浪涌抑制的情况。在新能源汽车里面，很大一部分的电路，是给浪涌给打坏的。由于在传统汽车电子里面，定义了足够强度的浪涌干扰，使得设计很清晰。而我们的新能源汽车里面，由于整车布置还有各种其他的原因，就使得浪涌超出了我们之前的定义，特别是我们在国内的车辆，整个实际的测定就是要超出原有的设计的。<div style='margin: 0px 0px 10px; padding: 0px; text-align: justify; color: rgb(100, 100, 100); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: myFont, "Microsoft YaHei"; font-size: 16px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);">我是有这样的建议：<ul style='margin: 0px; padding: 0px; text-align: justify; color: rgb(100, 100, 100); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: myFont, "Microsoft YaHei"; font-size: 16px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' .="list-paddingleft-2"><div style="margin: 0px 0px 10px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);">核心系统要在浪涌上考虑多50%和考虑足够的冗余，如出现TVS烧毁的时候，采用一些冗余效果可能就会比较好<div style="margin: 0px 0px 10px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);">需要评估基于新的电压体系下，各个参数的适用性，特别是器件供应商缺乏足够的数据来优化器件，还有给你足够的指导<div style="margin: 0px 0px 10px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);">TVS和MOV可以搭配，根据成本的情况来考虑选择，之前TVS的价格也下的比较快了<ul style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="list-paddingleft-2"><div style="margin: 0px 0px 10px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);">这里的实际不同封装的响应浪涌的情况，可以多做些对比测试
<div style='margin: 0px 0px 10px; padding: 0px; text-align: justify; color: rgb(100, 100, 100); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: myFont, "Microsoft YaHei"; font-size: 16px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);"><span style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="color: rgb(2, 30, 170);">旧文回顾<div style='margin: 0px 0px 10px; padding: 0px; text-align: justify; color: rgb(100, 100, 100); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: myFont, "Microsoft YaHei"; font-size: 16px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);"><span style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="color: rgb(2, 30, 170);">Metal Oxide Varistor 金属氧化物压敏电阻，今天要探讨的就是这个器件，一般的我们使用的贴片的较多，这里简称层叠的MOV为MLV（Multilayer Varistors）。

                               
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<div style='margin: 0px 0px 10px; padding: 0px; text-align: justify; color: rgb(100, 100, 100); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: myFont, "Microsoft YaHei"; font-size: 16px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);"><span style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="color: rgb(2, 30, 170);">我们选取一个5.6V和14V的MOV看VI特性曲线：

                               
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<div style='margin: 0px 0px 10px; padding: 0px; text-align: justify; color: rgb(100, 100, 100); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: myFont, "Microsoft YaHei"; font-size: 16px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);"><span style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="color: rgb(2, 30, 170);">等效电路如下图：

                               
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<div style='margin: 0px 0px 10px; padding: 0px; text-align: justify; color: rgb(100, 100, 100); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: myFont, "Microsoft YaHei"; font-size: 16px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);"><span style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="color: rgb(2, 30, 170);">MOV的特性一般从Datasheet来看以下几个：<div style='margin: 0px 0px 10px; padding: 0px; text-align: justify; color: rgb(100, 100, 100); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: myFont, "Microsoft YaHei"; font-size: 16px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);"><span style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="color: rgb(2, 30, 170);">汽车级MOV参数（直流）

                               
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<div style='margin: 0px 0px 10px; padding: 0px; text-align: justify; color: rgb(100, 100, 100); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: myFont, "Microsoft YaHei"; font-size: 16px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);"><span style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="color: rgb(2, 30, 170);">压敏电压(Breakdown Voltage)：<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">流过压敏电阻器的电流为1mA时，加在它两端的电压降称为压敏电压。<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">工作电压(Working Voltage)：<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">压敏电阻器正常工作时的电压，此时流过的电流为漏电流。<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">最大能量吸收能力(Energy Load-Dump)&(Energy 10*1000μs)<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">施加能量为某一定值的规定波形(这里我们一般分两种，一种是ISO7637中规定的抛负载波形，另外一种是上升时间10μs，持续时间1000μs的脉冲)的冲击电流，冲击后压敏电压变化的绝对值小于10%且样品无机械破损所能通过的最大能量。<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">耐浪涌电流能力(Peak Current @ Amp. 8*20μs)<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">压 敏电阻器经大脉冲电流冲击后，其U/I特性会产生蜕变。蜕变的结果会使漏电流增大，压敏电压下降。把满足下降要求的压敏电阻器所承受的最大冲击电流，称为 压敏电阻器的通流容量，也称为通流能力或通流量，它是表征压敏电阻器耐受高浪涌电流冲击的能力的一个参量。此参数与脉冲幅度，脉冲持续时间及所承受的脉冲 次数有关。

                               
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<div style='margin: 0px 0px 10px; padding: 0px; text-align: justify; color: rgb(100, 100, 100); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: myFont, "Microsoft YaHei"; font-size: 16px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);"><span style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="color: rgb(2, 30, 170);">一半工业级MOV参数

                               
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<div style='margin: 0px 0px 10px; padding: 0px; text-align: justify; color: rgb(100, 100, 100); text-transform: none; text-indent: 0px; letter-spacing: normal; font-family: myFont, "Microsoft YaHei"; font-size: 16px; font-style: normal; font-weight: normal; word-spacing: 0px; white-space: normal; word-wrap: break-word; box-sizing: border-box; orphans: 2; widows: 2; background-color: rgb(255, 255, 255); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;' .="box-sizing: inherit;margin-top: 10px;color: rgb(85, 85, 85);"><span style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="color: rgb(2, 30, 170);">最大直流工作电压（UDC）<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">在最高工作温度下连续施加1000小时的直流电压，然后在室温和正常湿度下存放1-2小时，压敏电阻器的压敏电压的变化绝对值小于10%所能施加的最大电压。<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">压敏电压(Breakdown Voltage)：<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">流过压敏电阻器的电流为1mA时，加在它两端的电压降称为压敏电压。<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">钳制电压（Max Clamping Voltage）：<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">流过压敏电阻器的电流为Ip时，加在它两端的电压降称为钳制电压，钳制电压也称为压敏电阻器的保护水平。<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">Ip：与压敏电阻器的电极面积及电压等级有关，一般Ip为1~100A。<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">最大能量吸收能力(Energy 10*1000μs)<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">施加能量为某一定值的规定波形(上升时间10μs，持续时间1000μs的脉冲)的冲击电流，冲击后压敏电压变化的绝对值小于10%且样品无机械破损所能通过的最大能量。<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">耐浪涌电流能力(Peak Current @ Amp. 8*20μs)<br style="margin: 0px; padding: 0px; word-wrap: break-word; box-sizing: border-box;" .="box-sizing: inherit;">压 敏电阻器经大脉冲电流冲击后，其U/I特性会产生蜕变。蜕变的结果会使漏电流增大，压敏电压下降。把满足下降要求的压敏电阻器所承受的最大冲击电流，称为 压敏电阻器的通流容量，也称为通流能力或通流量，它是表征压敏电阻器耐受高浪涌电流冲击的能力的一个参量。此参数与脉冲幅度，脉冲持续时间及所承受的脉冲 次数有关。

地沟油

        

weixiao

    

chen

wangy2000

好文章，收藏。谢谢。

ghyfb

longxuekai

这个好啊，看看

riverhill

  

gaibian

summer稳