直流屏充電模塊的主要功能是實現AC/DC變換，還有系統控制、告警等功能。 自動/手動控制：直流屏充電模塊具有自動/手動控制功能，在自動工作方式下，充電模塊接收來自監控模塊的指令。通常情況下，所有合閘模塊應工作于自動狀態下，以實現監控模塊對電池的智能管理。手動狀態下，有模塊面板上的電位器來調節模塊的輸出電壓。 電壓調節：直流屏充電模塊接受監控模塊的指令，調節輸出電壓到設定值。電壓調整范圍可以在輸出電壓下限（一般為198V/99V）和上限（一般為286V/143V）之間。 限流：指將充電模塊的大輸出電流限制在一定的范圍內，以控制電池充電電流，防止電池過流充電。
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