场效应管或连接电源

摘要：本电源序感官的亏损主电源电压，并通过控制两个场效应管，自动负载切换到辅助（备份）供应。

Maxim>AppNotes>BATTERYMANAGEMENTPOWER-SUPPLYCIRCUITSKeywords:backupsupply,batteryoperation,diode-OR,MOSFET,power-supplysequencingJul25,2006APPLICATIONNOTE3864TheFET-ORConnectionforPowerSuppliesAbstract:Thispower-supplysequencersensesalossofthemainsupplyvoltageand,bycontrollingthetwoFETs,automaticallyswitchestheloadtothesecondary(backup)supply.TheFigure1circuitprovidesa"diode-OR"functionforapplicationsthatmustswitchautomaticallybetweenthemainandbackupsupplyvoltages.Suchapplicationsincludebattery-backedmemorysuppliesandanybattery-operateddevicewithawall-adapterconnection.Figure1.Thispower-supplysequencersensesalossofthemainsupplyvoltageand,bycontrollingth