LED显示屏是的主体元件是LED和驱动芯片,属于微电子产品的集合体,LED的工作电压在5V左右,一般工作电流为20毫安以下。它的工作特性决定了它面对静电和异常电压或电流冲击的抗性十分脆弱。这就需要我们在生产和使用过程中认识到这一点并给予足够的重视，采取措施对led显示屏进行保护。而电源接地是LED显示屏最常用的一种保护方法。下面河南电子屏厂家来跟(gen)大(da)家探讨一下吧！

为(wei)(wei)什(shen)么(me)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)要(yao)接地(di)(di)？这个和开关(guan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)的(de)工作模(mo)式(shi)有(you)关(guan)，我们(men)LED显(xian)示(shi)屏(ping)(ping)开关(guan)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)是(shi)一(yi)种(zhong)通过(guo)滤(lv)(lv)波(bo)(bo)—整流(liu)—脉冲调制(zhi)—输(shu)出整流(liu)—滤(lv)(lv)波(bo)(bo)等一(yi)系(xi)列手(shou)段将交流(liu)（AC）220V市电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)转化成直流(liu)(DC)5V直流(liu)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)稳定输(shu)出的(de)一(yi)种(zhong)设(she)备(bei)。为(wei)(wei)了(le)保(bao)证(zheng)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)AC/DC转化的(de)稳定性，电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)厂家按照国家3C强制(zhi)标准在AC220V输(shu)入(ru)端(duan)的(de)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路设(she)计中，从火线至(zhi)地(di)(di)线跨接一(yi)个EMI滤(lv)(lv)波(bo)(bo)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路。以(yi)保(bao)证(zheng)AC220V输(shu)入(ru)的(de)稳定性，所(suo)以(yi)所(suo)有(you)的(de)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)在工作是(shi)都(dou)会(hui)存(cun)在滤(lv)(lv)波(bo)(bo)漏(lou)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)，单个电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)的(de)漏(lou)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)的(de)3.5mA左右。漏(lou)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)约(yue)为(wei)(wei)110V。在显(xian)示(shi)屏(ping)(ping)不(bu)接地(di)(di)的(de)情况下，漏(lou)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)不(bu)但可能引起芯片损(sun)坏(huai)(huai)或(huo)者(zhe)灯(deng)管烧(shao)坏(huai)(huai)。如(ru)果使用20个电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)以(yi)上，累加的(de)漏(lou)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)达到70mA以(yi)上。足(zu)以(yi)导致(zhi)漏(lou)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)保(bao)护器(qi)(qi)动作，切(qie)断供电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)。这个也是(shi)为(wei)(wei)什(shen)么(me)我们(men)显(xian)示(shi)屏(ping)(ping)无法(fa)使用漏(lou)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)保(bao)护器(qi)(qi)的(de)原因。如(ru)果不(bu)接漏(lou)保(bao)而(er)(er)且(qie)显(xian)示(shi)屏(ping)(ping)不(bu)接地(di)(di)，电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)叠加的(de)漏(lou)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)将超(chao)过(guo)人(ren)体安全电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，110V的(de)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)足(zu)以(yi)致(zhi)人(ren)死地(di)(di)！而(er)(er)接地(di)(di)后，电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)外壳电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)压(ya)对(dui)人(ren)体接近0。表明电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)与人(ren)体之间不(bu)存(cun)在电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)位差，漏(lou)电(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)被导入(ru)大地(di)(di)。所(suo)以(yi),LED显(xian)示(shi)屏(ping)(ping)必须接地(di)(di)。

但是(shi)经常有(you)(you)客户采用错误的(de)接(jie)(jie)地方(fang)法为显示屏接(jie)(jie)地，常见的(de)有(you)(you)：

1、认为户外立柱(zhu)式结构的立柱(zhu)下端(duan)是与大地(di)(di)连接，所以(yi)不(bu)需(xu)要在(zai)做显示屏接地(di)(di)；

2、认为电源是锁在(zai)箱(xiang)体上(shang)，而箱(xiang)体之间是相互用(yong)锁扣与结构连接，所以结构接地(di)就代表电源也接地(di)。

此两类做法存在(zai)误(wu)区，我们的(de)(de)(de)立柱(zhu)是(shi)与地(di)基的(de)(de)(de)地(di)脚螺栓保持连接(jie)(jie)(jie)，而地(di)脚螺栓是(shi)预埋在(zai)混凝(ning)土里(li)面的(de)(de)(de)，混凝(ning)土的(de)(de)(de)电(dian)阻在(zai)100-500Ω的(de)(de)(de)范围(wei)内，接(jie)(jie)(jie)地(di)电(dian)阻过(guo)高将(jiang)导(dao)致漏(lou)电(dian)流泄放不(bu)及(ji)时(shi)(shi)或存在(zai)残留。我们的(de)(de)(de)箱(xiang)体(ti)表(biao)面有喷(pen)涂油漆，而油漆是(shi)电(dian)的(de)(de)(de)不(bu)良导(dao)体(ti)，将(jiang)会导(dao)致箱(xiang)体(ti)连接(jie)(jie)(jie)接(jie)(jie)(jie)地(di)的(de)(de)(de)接(jie)(jie)(jie)触不(bu)良或接(jie)(jie)(jie)地(di)电(dian)阻升高，有可能出(chu)现电(dian)火(huo)花(hua)干扰屏体(ti)信号(hao)。随(sui)着时(shi)(shi)间的(de)(de)(de)推移，箱(xiang)体(ti)或结(jie)构表(biao)面将(jiang)会出(chu)现氧化和(he)锈蚀，螺丝(si)等(deng)固定件也随(sui)着温差变化导(dao)致的(de)(de)(de)热胀冷缩(suo)逐渐松(song)动。将(jiang)会导(dao)致结(jie)构接(jie)(jie)(jie)地(di)的(de)(de)(de)效果减弱(ruo)甚至完(wan)全失效。形成安全隐患。导(dao)致漏(lou)流触电(dian)、芯(xin)片受(shou)干扰损坏等(deng)安全事故的(de)(de)(de)发生。

那(nei)么，标准的接(jie)地(di)应该是(shi)怎样(yang)的呢(ni)？如(ru)下所(suo)(suo)示：电(dian)源输入(ru)端(duan)(duan)有(you)3个接(jie)线(xian)(xian)端(duan)(duan)子(zi)(zi)，分别是(shi)火线(xian)(xian)端(duan)(duan)子(zi)(zi)、零线(xian)(xian)端(duan)(duan)子(zi)(zi)和(he)接(jie)地(di)端(duan)(duan)子(zi)(zi)。正确的接(jie)地(di)做法(fa)是(shi)使用接(jie)地(di)专(zhuan)用的黄绿双色线(xian)(xian)将所(suo)(suo)有(you)电(dian)源地(di)线(xian)(xian)端(duan)(duan)子(zi)(zi)串接(jie)并(bing)锁紧，然(ran)后引出连接(jie)至接(jie)地(di)端(duan)(duan)。

如果现场(chang)没有接(jie)(jie)地(di)(di)端(duan)子(zi)，可以连接(jie)(jie)至铁质(zhi)自来(lai)水(shui)管或铁质(zhi)下(xia)水(shui)管道(dao)等埋设与(yu)大(da)地(di)(di)并与(yu)大(da)地(di)(di)保持良好(hao)接(jie)(jie)触(chu)的(de)管道(dao)上，为保证(zheng)接(jie)(jie)触(chu)良好(hao)应在(zai)此类自然接(jie)(jie)地(di)(di)体(ti)上焊接(jie)(jie)接(jie)(jie)线(xian)端(duan)子(zi)，然后将(jiang)地(di)(di)线(xian)紧锁在(zai)接(jie)(jie)线(xian)端(duan)子(zi)上，不得(de)捆绑连接(jie)(jie)。但煤(mei)气等易燃(ran)易爆和的(de)管道(dao)不得(de)使(shi)用(yong)。或者(zhe)现场(chang)埋设接(jie)(jie)地(di)(di)体(ti)。接(jie)(jie)地(di)(di)体(ti)可以采用(yong)角(jiao)钢(gang)或者(zhe)钢(gang)管，水(shui)平或者(zhe)竖直埋入大(da)地(di)(di)中作为简易接(jie)(jie)地(di)(di)点(dian)(dian)，接(jie)(jie)地(di)(di)点(dian)(dian)应选择偏僻的(de)地(di)(di)方(fang)，以免行人(ren)或者(zhe)车辆破坏接(jie)(jie)地(di)(di)体(ti)。

我们接(jie)地(di)(di)(di)时(shi)(shi)接(jie)地(di)(di)(di)电(dian)阻必须小于4欧姆，以(yi)保(bao)证漏电(dian)流(liu)的及时(shi)(shi)泄(xie)放(fang)。需(xu)要(yao)注意的是，防(fang)雷(lei)接(jie)地(di)(di)(di)端(duan)在泄(xie)放(fang)雷(lei)击电(dian)流(liu)时(shi)(shi)由于大(da)地(di)(di)(di)电(dian)流(liu)的扩散需(xu)要(yao)一定时(shi)(shi)间，短时(shi)(shi)间内(nei)会导致大(da)地(di)(di)(di)电(dian)位升高(gao)，如(ru)果LED显示(shi)屏接(jie)地(di)(di)(di)联接(jie)至防(fang)雷(lei)接(jie)地(di)(di)(di)端(duan)，这(zhei)时(shi)(shi)大(da)地(di)(di)(di)电(dian)位比显示(shi)屏要(yao)高(gao)，雷(lei)击电(dian)流(liu)将会沿顺这(zhei)地(di)(di)(di)线传递(di)至屏体，造成设备损坏(huai)。所(suo)以(yi)LED显示(shi)屏这(zhei)种保(bao)护(hu)接(jie)地(di)(di)(di)不得联结至防(fang)雷(lei)接(jie)地(di)(di)(di)端(duan)上，保(bao)护(hu)接(jie)地(di)(di)(di)端(duan)必须距离(li)防(fang)雷(lei)接(jie)地(di)(di)(di)端(duan)20米以(yi)上。防(fang)止地(di)(di)(di)电(dian)位的反击。

LED接(jie)地(di)注意事项总结：

1、每个电源都(dou)必须从接(jie)地端子接(jie)地，并(bing)锁(suo)紧(jin)；

2、接地电(dian)阻(zu)不得大于4Ω；

3、地线(xian)应为专属导(dao)线(xian)，严禁(jin)和零线(xian)联接；

4、地线上不得安(an)装空开或熔(rong)断器(qi)；

5、地线(xian)和接(jie)地端子都应(ying)远离防(fang)雷接(jie)地端20以上；

严禁(jin)部分设(she)(she)备(bei)采用保(bao)(bao)护接(jie)(jie)地来(lai)代(dai)替保(bao)(bao)护接(jie)(jie)零，造(zao)成保(bao)(bao)护接(jie)(jie)地和保(bao)(bao)护接(jie)(jie)零混接(jie)(jie)错接(jie)(jie)。当(dang)某一保(bao)(bao)护接(jie)(jie)地设(she)(she)备(bei)的绝缘损(sun)坏，发生相线(xian)碰壳时，零线(xian)出现对地电压(ya)，于是使保(bao)(bao)护接(jie)(jie)零设(she)(she)备(bei)的外壳上就产生了危险电压(ya)。

因此(ci)，在(zai)同一母(mu)线(xian)供电(dian)的(de)线(xian)路中，保护接地(di)(di)和保护接零不能混用，即不可把一部(bu)分电(dian)气(qi)设备接零，而(er)将另一部(bu)分电(dian)气(qi)设备接地(di)(di)。一般市(shi)电(dian)都采(cai)用接零保护，故使用市(shi)电(dian)的(de)电(dian)气(qi)设备，应(ying)采(cai)取接零保护。

4、保护接(jie)零注(zhu)意事项

（1）在保(bao)(bao)护接(jie)零(ling)的电(dian)(dian)气系统中(zhong)。零(ling)线(xian)起(qi)着至关重要(yao)的作用。一旦零(ling)线(xian)断(duan)开，接(jie)在断(duan)线(xian)处(chu)(chu)后(hou)面的一段(duan)线(xian)路的电(dian)(dian)气设(she)备相(xiang)当于(yu)没有(you)(you)了保(bao)(bao)护接(jie)零(ling)和(he)保(bao)(bao)护接(jie)地，若在零(ling)线(xian)断(duan)处(chu)(chu)后(hou)面有(you)(you)电(dian)(dian)气设(she)备外(wai)壳漏电(dian)(dian)则不构(gou)成(cheng)短路回路，而(er)使熔体(ti)熔断(duan)。不但(dan)该台设(she)备外(wai)壳带有(you)(you)电(dian)(dian)压，而(er)且使得断(duan)线(xian)处(chu)(chu)后(hou)面的所有(you)(you)设(she)备的外(wai)壳都存(cun)在接(jie)近电(dian)(dian)源相(xiang)电(dian)(dian)压的对地电(dian)(dian)压，触电(dian)(dian)危险性将扩大。

所有电气设备(bei)接(jie)保(bao)护(hu)接(jie)零(ling)(ling)线(xian)(xian)均(jun)应以并(bing)联方式接(jie)在(zai)电源零(ling)(ling)线(xian)(xian)上(shang)，不允许串联，并(bing)用螺栓压(ya)紧，牢固(gu)可靠，接(jie)触良好。在(zai)零(ling)(ling)线(xian)(xian)上(shang)，禁(jin)止安装(zhuang)保(bao)险和单独开关。在(zai)特殊的环境中，零(ling)(ling)线(xian)(xian)做防(fang)腐处理也就不言(yan)而(er)喻了(le)。

（2）中(zhong)性(xing)点不(bu)接(jie)地(di)的(de)(de)三(san)相(xiang)四线制配电(dian)(dian)系(xi)(xi)统中(zhong)，不(bu)允(yun)许用(yong)保(bao)护(hu)接(jie)零(ling)，只(zhi)能用(yong)保(bao)护(hu)接(jie)地(di)。系(xi)(xi)统中(zhong)任意(yi)一相(xiang)发生接(jie)地(di)，整个系(xi)(xi)统仍照常运行，但大地(di)与接(jie)地(di)线等(deng)电(dian)(dian)位，则接(jie)在零(ling)线上的(de)(de)用(yong)电(dian)(dian)设备外壳对(dui)地(di)电(dian)(dian)压降等(deng)于接(jie)地(di)的(de)(de)相(xiang)线从(cong)接(jie)地(di)点到中(zhong)性(xing)点的(de)(de)电(dian)(dian)压值，是十分危险(xian)的(de)(de)。

（3）在采(cai)用保护接(jie)零系统(tong)中还(hai)要在电源中性(xing)点(dian)进(jin)行工作接(jie)地(di)(di)和零线(xian)一(yi)定间隔(ge)距(ju)离及终端进(jin)行重(zhong)复接(jie)地(di)(di)。在中性(xing)点(dian)接(jie)地(di)(di)的系统(tong)中除将变压器中性(xing)点(dian)做接(jie)地(di)(di)外，沿零线(xian)走(zou)向的一(yi)处(chu)或者(zhe)多处(chu)再次将零线(xian)接(jie)地(di)(di)叫重(zhong)复接(jie)地(di)(di)。

其作用(yong)是(shi)(shi)当电(dian)(dian)(dian)(dian)气设(she)(she)(she)备(bei)(bei)外(wai)壳(qiao)(qiao)漏(lou)(lou)电(dian)(dian)(dian)(dian)时(shi)可以降低(di)对(dui)地电(dian)(dian)(dian)(dian)压(ya)(ya)。当零线(xian)断(duan)时(shi)也减轻触电(dian)(dian)(dian)(dian)危(wei)险(xian)(xian)。当电(dian)(dian)(dian)(dian)气设(she)(she)(she)备(bei)(bei)外(wai)壳(qiao)(qiao)漏(lou)(lou)电(dian)(dian)(dian)(dian)时(shi)，经相线(xian)、零线(xian)构成短路回路，短路电(dian)(dian)(dian)(dian)流(liu)将熔断(duan)保险(xian)(xian)。设(she)(she)(she)备(bei)(bei)外(wai)壳(qiao)(qiao)随之断(duan)电(dian)(dian)(dian)(dian)，不(bu)会(hui)出现触电(dian)(dian)(dian)(dian)危(wei)险(xian)(xian)。但是(shi)(shi)保险(xian)(xian)熔断(duan)之前设(she)(she)(she)备(bei)(bei)带(dai)电(dian)(dian)(dian)(dian)，对(dui)人身(shen)还是(shi)(shi)有危(wei)险(xian)(xian)的(de)。若在接(jie)(jie)近(jin)设(she)(she)(she)备(bei)(bei)处再加接(jie)(jie)地装置(zhi)，即(ji)实(shi)行(xing)重复(fu)接(jie)(jie)地，带(dai)电(dian)(dian)(dian)(dian)设(she)(she)(she)备(bei)(bei)的(de)导体(ti)部(bu)分(fen)对(dui)地电(dian)(dian)(dian)(dian)压(ya)(ya)降低(di)。

（4）保(bao)(bao)护(hu)(hu)接零必须有可(ke)靠(kao)灵敏(min)的短路(lu)保(bao)(bao)护(hu)(hu)装置来配(pei)合，因此，熔(rong)断丝严禁用铜丝等金属材(cai)料来代(dai)替符合要求的金属熔(rong)断丝，否则(ze)接零保(bao)(bao)护(hu)(hu)将失去(qu)其保(bao)(bao)护(hu)(hu)作用。

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