485通訊壓力變送器電路板中的保護電路有哪些？
點擊次數：330 更新時間：2023-09-01
在485通訊壓力變送器電路板中，為了保護電路板和傳感器，通常會采用多種保護電路。這些保護電路能夠有效地防止電路板受到過電壓、過電流、靜電放電等因素的損壞，提高設備的可靠性和穩定性。以下是一些常見的保護電路：
1、過壓(ya)(ya)(ya)保(bao)(bao)護(hu)電(dian)路(lu)：過壓(ya)(ya)(ya)保(bao)(bao)護(hu)電(dian)路(lu)用于防止電(dian)路(lu)板受(shou)(shou)到過高(gao)的(de)電(dian)壓(ya)(ya)(ya)沖擊。它通(tong)常包括過壓(ya)(ya)(ya)保(bao)(bao)護(hu)二極管和過壓(ya)(ya)(ya)保(bao)(bao)護(hu)電(dian)阻。當輸入(ru)電(dian)壓(ya)(ya)(ya)超過設定的(de)閾值(zhi)時，過壓(ya)(ya)(ya)保(bao)(bao)護(hu)二極管會將過壓(ya)(ya)(ya)電(dian)流引(yin)導到地，保(bao)(bao)護(hu)485通(tong)訊壓(ya)(ya)(ya)力(li)變(bian)送器電(dian)路(lu)板不受(shou)(shou)損壞。
2、過(guo)(guo)(guo)流(liu)(liu)保(bao)(bao)(bao)護(hu)(hu)電(dian)路(lu)：過(guo)(guo)(guo)流(liu)(liu)保(bao)(bao)(bao)護(hu)(hu)電(dian)路(lu)用(yong)于防止電(dian)路(lu)板受(shou)到過(guo)(guo)(guo)大的(de)電(dian)流(liu)(liu)沖(chong)擊。它通常包括過(guo)(guo)(guo)流(liu)(liu)保(bao)(bao)(bao)護(hu)(hu)電(dian)阻和(he)過(guo)(guo)(guo)流(liu)(liu)保(bao)(bao)(bao)護(hu)(hu)開(kai)關(guan)。當電(dian)流(liu)(liu)超過(guo)(guo)(guo)設定的(de)閾值時，過(guo)(guo)(guo)流(liu)(liu)保(bao)(bao)(bao)護(hu)(hu)電(dian)阻會引(yin)起過(guo)(guo)(guo)壓，進而觸發過(guo)(guo)(guo)流(liu)(liu)保(bao)(bao)(bao)護(hu)(hu)開(kai)關(guan)，切斷電(dian)路(lu)，以保(bao)(bao)(bao)護(hu)(hu)電(dian)路(lu)板和(he)其(qi)他元(yuan)件。
3、靜電(dian)(dian)(dian)(dian)(dian)放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)保(bao)護(hu)電(dian)(dian)(dian)(dian)(dian)路(lu)：靜電(dian)(dian)(dian)(dian)(dian)放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)是電(dian)(dian)(dian)(dian)(dian)子設備(bei)常(chang)見的潛在(zai)危(wei)險之一。為了防止(zhi)靜電(dian)(dian)(dian)(dian)(dian)放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)對電(dian)(dian)(dian)(dian)(dian)路(lu)板造成(cheng)損害(hai)，通常(chang)會在(zai)輸(shu)入和輸(shu)出接口處(chu)添加靜電(dian)(dian)(dian)(dian)(dian)保(bao)護(hu)電(dian)(dian)(dian)(dian)(dian)路(lu)。這(zhe)種(zhong)保(bao)護(hu)電(dian)(dian)(dian)(dian)(dian)路(lu)主要采用(yong)靜電(dian)(dian)(dian)(dian)(dian)放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)二極管和靜電(dian)(dian)(dian)(dian)(dian)放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)保(bao)護(hu)電(dian)(dian)(dian)(dian)(dian)阻，能(neng)夠將靜電(dian)(dian)(dian)(dian)(dian)放(fang)(fang)(fang)(fang)電(dian)(dian)(dian)(dian)(dian)引導到(dao)地，保(bao)護(hu)電(dian)(dian)(dian)(dian)(dian)路(lu)板免受靜電(dian)(dian)(dian)(dian)(dian)損害(hai)。
4、溫(wen)度保(bao)護電(dian)路：溫(wen)度是影響(xiang)電(dian)路板(ban)和傳感器性能(neng)的重(zhong)要因(yin)素(su)之一。為了(le)防止過(guo)熱對(dui)設備造(zao)成損(sun)壞，通常(chang)會在485通訊壓力變送器電(dian)路板(ban)上添加(jia)溫(wen)度保(bao)護電(dian)路。這種保(bao)護電(dian)路可以監測電(dian)路板(ban)的溫(wen)度，當溫(wen)度超過(guo)設定的閾(yu)值時，會觸(chu)發(fa)保(bao)護機制(zhi)，如(ru)切斷電(dian)源或降低(di)功率，以保(bao)護設備不受過(guo)熱影響(xiang)。
5、過(guo)(guo)載(zai)(zai)保(bao)(bao)護電路(lu)：過(guo)(guo)載(zai)(zai)保(bao)(bao)護電路(lu)用于防止設備(bei)受到過(guo)(guo)大的(de)負載(zai)(zai)沖擊。它通常通過(guo)(guo)電流(liu)傳感器(qi)來(lai)監(jian)測負載(zai)(zai)電流(liu)，當電流(liu)超過(guo)(guo)設定的(de)閾(yu)值時，會觸發保(bao)(bao)護機制(zhi)，如切(qie)斷電源或降低輸出功(gong)率(lv)，以避免設備(bei)過(guo)(guo)載(zai)(zai)損壞。
6、瞬(shun)態保護電(dian)(dian)路(lu)：瞬(shun)態保護電(dian)(dian)路(lu)用于抵御電(dian)(dian)路(lu)中的瞬(shun)態干(gan)(gan)擾(rao)(rao)，如(ru)電(dian)(dian)磁干(gan)(gan)擾(rao)(rao)和(he)電(dian)(dian)壓峰值。這種保護電(dian)(dian)路(lu)通常(chang)包(bao)括瞬(shun)態電(dian)(dian)壓抑制器和(he)瞬(shun)態電(dian)(dian)壓抑制二極管，能夠將瞬(shun)態干(gan)(gan)擾(rao)(rao)引導到(dao)地，保護電(dian)(dian)路(lu)板免受干(gan)(gan)擾(rao)(rao)和(he)損壞。
以上是485通訊壓力變送器電(dian)路(lu)(lu)板中常見的保護(hu)電(dian)路(lu)(lu)。通過合理設計和(he)(he)應用這(zhe)些保護(hu)電(dian)路(lu)(lu)，可以有效地保護(hu)電(dian)路(lu)(lu)板和(he)(he)傳感(gan)器，提高(gao)設備(bei)的可靠性和(he)(he)穩(wen)定性，延長設備(bei)的使(shi)用壽(shou)命。在實際(ji)應用中，還需要(yao)根(gen)據具體的需求和(he)(he)環(huan)境條件，選擇(ze)適(shi)合的保護(hu)電(dian)路(lu)(lu)，并進行(xing)合理的布(bu)局和(he)(he)連接。
