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0090-35771 AMAT 半導體儀器
0090-35771 AMAT 半導體儀器
0090-35771 AMAT 半導體儀器
微功率DC-DC電源模塊以高集成度、高可靠性、簡化設計等多重優勢，廣泛應用於電路設計中。雖然其應用電路簡單，操作簡單，但往往在應用時還是會遇到一些常見問題。針對此本文對電源模塊常見的應用問題以及如何排除故障進行一次詳細的分析。
微功率DC-DC電源模塊以高集成度、高可靠性、簡化設計等多重優勢，受到很多電子設計者的青睞。電源模塊雖然應用電路簡單，操作簡單，但往往在應用時還是會遇到一些常見問題。針對此本文對電源模塊常見的應用問題以及如何排除故障進行詳細的分析，希望對設計者的電源模塊選型時有所幫助。
常見問題一：輸出紋波噪聲偏大
原因1：模塊在使用時，負載為動態負載，使得模塊輸出電壓峰峰值變大，但注意這不是紋波噪聲。
當負載電流如果進行周期性突變時，模塊輸出電壓的峰峰值會變大。這是一個瞬態量，但有時會被誤以為是紋波噪聲。所以當使用一個電源模塊給多個電路單元供電時，對於有周期性負載變化的電路，前級需要增加π型濾波，減小這部分電路的瞬態變化對其他電路的幹擾。
例如，下圖中電路B由於負載大小的變化，使得輸入電壓波動。為了減小電路B對電路A的幹擾，建議在電路B的輸入端增加π型濾波。
圖 1 電路鏈接框圖
原因2：示波器地線問題
在測試電源輸出的紋波噪聲時，示波器的地線夾和地線、模塊輸出引腳形成一個環路，類似於天線接收器，會引入其他噪聲。如果測試的環境幹擾大，這種噪聲也會由示波器引入，影響紋波噪聲測試的結果。
且平常我們購買的示波器探頭的地與示波器內部的大地線相連，這種情況對工頻幹擾的抗擾能力弱，容易引入幹擾噪聲。所以在使用中好保證示波器探頭浮地處理(隔離開示波器的電源地，或者直接使用電池供電的示波器)，減少引入的幹擾。如果測量對象的供電電源也是浮地，這樣，這樣就不會導致電路特性的改變，使模塊輸出噪聲增大。
常見問題二：模塊啟動後，輸出電壓偏低
原因1：輸入端有防反接電路
圖 2 模塊防反接鏈接框圖
舉例：圖2中的ZY_FKES-3W模塊是定壓輸入非穩壓輸出模塊，其輸出電壓會隨著輸入電壓和負載大小的變化而變化的。由於在電路設計時，在其輸入側增加了防反接二極管，於是這會導致到模塊輸入端的電壓降低，從而輸出電壓變小。因為我們在設計使用防反接二極管時，要考慮二極管的正向導通壓降。
原因2：輸出導線阻抗過大或者電壓表連接不規範
圖 3 模塊連接框圖
在使用電源模塊時，我們在測試輸出電壓，經常貪圖方便直接測試被供電電路輸入端的電壓。但由於模塊輸出端到被供電電路的輸入端之間的阻抗過大，所以會使得測量值比實際值偏低。因此在測試電源模塊的輸出電壓時，應該測量模塊輸出引腳之間的電壓，而非被供電電路輸入端的電壓。
原因3：在使用模塊時，未準確估算出所需的電源模塊功率，使模塊處於超載啟動或者超載工作狀態
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