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I need to use Li-ion as a power supply for my PCB. I will use solar power (converted by solar cells with light from the nearest sun) for charging it (or them if I need 2 cells). But the problem is, I've never design or use a circuit like this before. This is not new, so I think you can help me to do this. After finding out for a while, I find that I can buy a CORTEX device of ARM easily in my village. If you've worked with this device, plz help me. Thanks.
Must be someone living in a dual-star constellation then, since the distance between stars are normally so large that that the second closest star is rather weak.
After read thise comments, I think I've found a solution. BQ24071 of Texas Instrument may be suitable for my application: - It has different pins for charging battery and loading system. - It supports output current up to 2-4A (this will fit 2A peak current of SIM300D) Do I have sth wrong?
By the way, let's consider about solar panel. Solar panel 6V/2.5W is the only one that output 6V I can find in my location (so, maximum current is about 410mA in theory and about 200-300mA in real). How long does it take to charge a 1200mAh Li-Po battery to full capacity? Is this solar panel okay, then?
Otherwise, I have to choose a 12V solar panel and a regulator will be need to output 6V for charging. In this case, how much power is enough (5W, 10W ...)
Another thing is regulator for microcontroller, would you recommend a selection for this (output ~3.3V from 4.4V) (saving as much as power is good)?