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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Yes, that way the battery charger can manage the battery and the load independently. In case the main source power is not enough to provide power to the load, the battery will supplement the power.
OK, thank you Dragon, I think I came up with something - two P-FETs with the drain and source tied together. Two sources will connect to charger and battery respectively. I will ask a friend to run SPICE to confirm.
For Li-Ion battery, you should not connect the load directly to the battery as the battery in this case won't get charged properly, thus shorten the life of it.
I need to come up with a circuit that sits between the single cell Li-Ion charger and the battery so the uC can cut the battery off if the voltage gets lower than 3.0V. I heard of the bidirectional FET (since the battery will be charged as well as discharged) but could not find any reference...
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