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按照客戶電壓方案進行AC-DC電源輸出端浪涌測試,則等同于DC-DC電源輸入端浪涌測試。因為VRB-R3系列電源裸機是不具備相應的抗浪涌能力,并且其各類耐壓只有1500VDC。雖然其沒有PE輸入端,但進行4KV的共模浪涌一定會對產品造成損傷,其共模干擾會直接對后端的控制板造成影響;尤其是當控制板與箱體的距離很近時,將形成干擾路徑。經過實際模擬試驗也證實以上的干擾分析。
三、整改過程:
結合干擾三要素(干擾源、傳播路徑、被干擾對象),干擾源即為符合標準要求的共模浪涌4級,這因素是無法進行消除和改變;被干擾對象是其控制電路無法直接參與修改;因此只能通過傳播路徑進行優化整改。
優化措施1:在傳播路徑上進行干擾信號旁路處理
如圖1所示,若直接將Y電容更換為20D470K壓敏電阻進行鉗位,且后端DC-DC又具備一定隔離能力,客戶整體實驗結果確認OK。但此類系統標準規范要求AC-DC的輸出端對其PE端滿足2.5KVAC的隔離耐壓。而殘壓低的熱敏電阻無法滿足該耐壓要求,因此該優化措施不可行?蛻粜栳槍b信端口打靜電,在確保耐壓測試的漏電流不超標情況下,也需要保留這Y電容。
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