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电源切换与充电

Other Parts Discussed in Thread: TPS5430, BQ24295, BQ24195, BQ24035, BQ24296

请问如下需求如何实现:

电源1:备份电池是3.7V聚合锂电池,

电源2:TPS5430从12V转成的4V

用电设备的电压范围:3.4-4.5V

要求:当电源2有上电时从电源2取电,同时对电源1进行充电,当电源2断开时,从电源1取电,切换过程用电设备不能断电

麻烦指导,谢谢!