基于LT4356的本质安全型电源保护模块设计

Design of protection module of intrinsic safety power supply based on LT4356

针对目前本质安全型电源保护模块存在保护功能简单、转换效率低、抗干扰能力差、本质安全电流较小等问题,设计了一种基于LT4356浪涌抑制器的本质安全型电源保护模块;详细分析了该模块中软启动,过压、过流及电压跌落故障保护,保护锁定功能的实现原理。该模块实现输出电压DC5~18V,输出本质安全电流850~1 000mA,故障保护时间在2μs以内,符合GB 3836.4—2010本质安全要求。

In view of problems of simple protection function,low conversion efficiency,poor antiinterference ability and low intrinsic safety current existed in current protection module of intrinsic safetypower supply,aprotection module of intrinsic safety power supply based on surge suppressor LT4356 was designed.Function realization principle of the module was analyzed,including soft start,over-voltage,over-current and voltage sag protection,protection locking.The module with output voltage is DC5-18 V,the maximum current is 850-1 000 mA and fault protection time within 2μs,which meets intrinsic safety requirements of GB 3836.4-2010.