How to power a microchip off 2 batteries?

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garynorris

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Hi

I have a pic microchip and use 2 batteries. I would like to power the pic off 2 batteries in case one depletes. I tried using a voltage regulator but it it was causing my supplies to short when I connect it to a different board but without this board it works fine. Any other ideas?

Thanks
 

I am not clear on what you have and want.

Now, you are using 2 batteries in series?

You want to have the batteries in parallel?

What regulator did you use? Can you show the circuit?
 

Gnerally speaking, it's surely possible. You didn't show what you have been trying, so we can't see what's the problem with your design.
 



I attached a quick overview. So I have 2 batteries and a charger board to charge the batteries. The board receives commands through spi from the microchip which is being powered by a LDO. If I disconnect the charger board I have no issues with the micropic as it gets 16.8V. When I connect to the board the one of the supplies shorts.

Hope that clear
 

When I connect to the board the one of the supplies shorts.
Click to expand...
That's true according to the schematic. So no idea how the circuit is intended to work. I would expect e.g. two batteries ORed by diodes...
 

I think it can made .but you tell correctly the algorithm what you want ?
want you do like relay ?
 

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