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为何当用电池供给系统，工作正常；而外接电源供电时，容易出现系统电源不稳？
电池相当于一个大的超级电容维持电源稳定， 而外接电源供电， 系统电源通过调整进行稳定，受输入电压， 负载波动影响而会有所波动。但不会造成不稳定。
