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Engineering
Electrical Engineering
Building a solar phone charger
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[QUOTE="meBigGuy, post: 5417350, member: 391788"] The basic architecture seems OK, but you need proper battery chargers and overdischarge protection. Regarding the LiPO A 5V regulator can be used to power a proper LiPO charger, but cannot charge it directly. You will get fire if you don't use a LiPO charger. I previously posted a link to Lithium charging. (note that the phone has a very sophisticated Lithium charging system that runs off the 5V from the USB connector) Regarding the Phone: Connecting 5V to a phone does not mean it will charge. Depending on the phone you need to do special things to the DP and DN pins. That can be a simple a shorting DP/DN tohether (most common) or connecting proper resistor values (iphones) or other things. Regarding the NiMH charging: Matching the solar cell to the NiMH batteries and charging them properly is also a concern, especially avoiding overcharge. I don't have the answer for that [URL]http://batteryuniversity.com/learn/article/charging_nickel_metal_hydride[/URL] [/QUOTE]
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Building a solar phone charger
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