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    1. 深圳市全業電子有限公司歡迎您!

      全業電子:自恢復保險絲在移動電源電路防護中的應用

      作者:admin????來源:未知????發布時間:2020-07-23 09:33????瀏覽量:

        如今智能手機耗電量越來越大,大部分的智能手機電池都不可拆卸,一款容量大攜帶方便的移動電源就成了人們出門旅行必備的電子產品。但最近移動電源安全事故頻出,讓消費者與工程師不得不重新審視移動電源的設計與研發,除開移動電源的內部構造,對于移動電源中的電路防護,你又了解多少呢?


        移動電源的設計,首先要安全的給聚合物電池充電,因為電池成本比較高,而且為了系統的安全可靠工作,要有一個充電管理系統。當需要給便攜式設備充電時,聚合物電池對外放電,因為便攜式設備普遍輸入電壓為5V,所以有一個升壓5V的系統。不論是充電管理系統還是升壓系統,都需要電路板來提供,所以移動電源內部電路板設計得好壞決定了產品的智能與否。

        
        1.過充保護;鋰電池過充保護是用電源管理芯片去檢測電壓實現的,芯片內部在基準設置狀態下(手機鋰電池一般為3.5V)。當基準慢慢上升,當上升到VSS-VDD設計值時,這時的電壓就是保護過充關斷電壓,通過邏輯關系輸出低或者高電平來控制外部控制電路來實現過充保護。當電壓緩慢下降時設置VSS-VDD電壓值來 取基準值當基準檢測到在設置以下時,這是邏輯關系解除過充保護。

        
        2.過放保護;過放保護電壓是指放電過渡時保護電池的最低電壓,放電到這個電壓點時,保護電路切斷電路,達到保護電池的目的。根據電池壽命與放電深度的關系及電池電壓 與放電率和放電深度關系,結合設備實際負荷,確定電池放電終止電壓,設計電池放電防護電路。

        
        3.短路保護;短路造成的回路電流一般在額定工作電流的10倍以上,而過電流保護需要延遲約幾十毫秒,直接短路導致的數十倍額定電流在幾十毫秒內也會對電池組的性能產 生影響?,F有的保護方式有PPPTC法,該方法是通過電流產生的熱切斷回路,也需要毫秒級的反應時間,同時增加了回路中的阻抗。也有專用于電池組的短路集成芯片,此芯片應用范圍窄、成本高。


        4.PPTC介紹;PPTC采用高分子有機聚合物在高壓、高溫,硫化反應的條件下,攙加導電粒子材料后,經過特殊的工藝加工而成。自恢復保險絲(PPTC:高分子自恢復保險絲)是一種正溫度系數聚合物熱敏電阻,作過流保護用,可代替電流保險絲。由于聚合物自恢復保險絲為導體,其上會有電流通過。當有過電流通過聚合物自恢復保險絲時,產生的熱量(為I2R)將使其膨脹。從而碳黑粒子將分開、聚合物自恢復保險絲的電阻將上升。這將促使聚合物自恢復保險絲更快的產生熱、膨脹得更大,進一步使電 阻升高。當溫度達到125°C時,電阻變化顯著,從而使電流明顯減小。此時流過聚合物自恢復保險絲的小電流足以使其保持在這個溫度和處于高阻狀態。當故障清 除后,聚合物自恢復保險絲收縮至原來的形狀重新將碳黑粒子聯結起來,從而降低電阻至具有規定的保持電流這個水平。

       如需更多幫助,請點擊商橋在線客服咨詢,歡迎您的光臨,我們將竭誠為您服務!

       

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