过载电路保护电池和电源

摘要：电流检测放大器，双比较器，外部CMOS开关的组合，可以用来防止极性反接电池或负载短路的破坏性影响。

Maxim>AppNotes>CircuitProtectionKeywords:currentsenseamplifier,comparator,overloadprotection,comparators,currentoverload,batteryprotectionJan31,2001APPLICATIONNOTE731OverloadCircuitryProtectsBatteriesandPowerSuppliesAbstract:Acombinationofcurrent-senseamplifier,dual-comparator,andexternalCMOSswitchescanbeusedtopreventthedamagingeffectsofareversed-polaritybatteryorshort-circuitload.Themostwidelyuseddeviceforovercurrentprotectionisasimplefuse.Highcurrentduetoanoverloadheatsthefusiblemetalliclink,causingittomeltandopenthecircuit.Thefuseissimpleandeconomical.However,fuses'relativelylongreactiontime,highresistance,andneedforreplacementmakethemimpracticalforsomeapplications.Al