First of all I am just a hobbyist in electronics and am self-taught - thus my problem! I like to work a lot with robotics. I just joined the site and did some searching, but thought I should post my request for assistance.
I need help designing a simple circuit to charge a 3.7V/20mA LiPo cell from a 4.2V/18ma solar cell. I have researched various charging chips and voltage doublers, but either I find overkill or the two together do not work well. I have an AC powered charger that would work to completely charge the cell, but this design request will be used in a small robotics platform and I thought that while it was just sitting there - any ambient light could give it a little bit of a charge. I know this is not optimal, but again this would be a supplemental charger. Since the solar cell at times only puts out 1.8 to 2.2 v at a distance of 2 feet from a light, I would think I would need some sort of charge pump/super capacitor to help out. The other major design consideration is that it needs to be as small a possible and fit within a 1" X .5" space. I planned to use SMT parts for the final design, but could use other parts for protoyping.
I realize this is a lot to ask, but I am hopeful that someone will be willing to help me out.
Thanks,
Mike
I need help designing a simple circuit to charge a 3.7V/20mA LiPo cell from a 4.2V/18ma solar cell. I have researched various charging chips and voltage doublers, but either I find overkill or the two together do not work well. I have an AC powered charger that would work to completely charge the cell, but this design request will be used in a small robotics platform and I thought that while it was just sitting there - any ambient light could give it a little bit of a charge. I know this is not optimal, but again this would be a supplemental charger. Since the solar cell at times only puts out 1.8 to 2.2 v at a distance of 2 feet from a light, I would think I would need some sort of charge pump/super capacitor to help out. The other major design consideration is that it needs to be as small a possible and fit within a 1" X .5" space. I planned to use SMT parts for the final design, but could use other parts for protoyping.
I realize this is a lot to ask, but I am hopeful that someone will be willing to help me out.
Thanks,
Mike