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 > App Notes > Circuit Protection

Keywords: current sense amplifier, comparator, overload protection, comparators, current overload, battery protection Jan 31, 2001

APPLICATION NOTE 731
Overload Circuitry Protects Batteries and Power Supplies

Abstract: A combination of current-sense amplifier, dual-comparator, and external CMOS switches can be used to
prevent the damaging effects of a reversed-polarity battery or short-circuit load.

The most widely used device for overcurrent protection is a simple fuse. High current due to an overload heats the fusible
metallic link, causing it to melt and open the circuit. The fuse is simple and economical. However, fuses' relatively long
reaction time, high resistance, and need for replacement make them impractical for some applications.

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