二極體是最簡單保護電源反接的方式。
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圖中 VR1 是 XT-30 端子的電源供應口。 當電源反接時,蕭特基二極體 SS54B 會阻斷逆向壓差電流。
電源保護建議使用蕭特基二極體(Schottky diode, SBD),反應速度最快。
須注意的參數,以 SS520B 為例:
結論:SS520B 能防反接 200V;但代價是正常工作時,源電壓會被降低 1V。
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