带自锁功能的双电源供电系统自适应切换电路

Adaptive Switching Circuit for Dual Power Supply System with Self-locking Function

许多便携式电子产品使用电池供电,同时使用交流适配器(或USB)作为外部电源,即双电源供电。因此,阐述电池和适配器切换的技术要求,分析常用的双电源切换方案的优缺点。针对适配器或USB提供的电流无法满足负载需求引发的问题,提出了一种带自锁功能的适配器/电池双电源供电系统自适应切换电路。该电路具有简单可靠、成本低等优点,可用于各类充电器产品。

Many portable electronic products use batteries as power supply,and use AC adapters (or USB) as external power supply,that is,dual power supply. Therefore,the technical requirements of battery and adapter switching are elaborated,and the advantages and disadvantages of common dual power switching schemes are analyzed. Aiming at the problem that the current supplied by adapter or USB can not meet the load demand,an adaptive switching circuit of adapter/ battery dual power supply system with self-locking function is proposed. The circuit has the advantages of simple,reliable and low cost,and can be used in various charger products.