I'm trying to create a Solar USB charger.
Charger Specifications:
2x 4.5V solar cells (100mAh each) charge an amount of batteries (must be >8V). Here I have 2x AA NiMH, and 1 Sony infoLithium 7.2V battery pack.
Female USB connector charges any device that requires a USB to charge. Like all USB charged devices, Apple products require 5V (the 7805 voltage reducer is used). The two "digital" ports on the USB are for newer Apple products; they require 2V each, given by the 33kΩ reducers.
Solar cells have a secondary circuit to directly trickle charge USB.
Yellow LED = solar only power to USB Red LED = batteries charging Green LED = battery only power to USB
Voltage must be above 8V for 7805 Voltage Reducer to output the required 5V.
Does this theoretical circuit work?
Charger Specifications:
2x 4.5V solar cells (100mAh each) charge an amount of batteries (must be >8V). Here I have 2x AA NiMH, and 1 Sony infoLithium 7.2V battery pack.
Female USB connector charges any device that requires a USB to charge. Like all USB charged devices, Apple products require 5V (the 7805 voltage reducer is used). The two "digital" ports on the USB are for newer Apple products; they require 2V each, given by the 33kΩ reducers.
Solar cells have a secondary circuit to directly trickle charge USB.
Yellow LED = solar only power to USB Red LED = batteries charging Green LED = battery only power to USB
Voltage must be above 8V for 7805 Voltage Reducer to output the required 5V.
Does this theoretical circuit work?