the circuit of charging controller uses a 7.2V solar panel and a variable voltage regulator which LM317.
once the solar panel get the energy from sunlight, the LED will turn ON.
the charging current passed through diode to the LM317 by using adjust pin, output voltage and current can be regulated.
variable resistor placed between the adjust pin and ground to provide an output voltage of 5v of battery.
resistor and diode to prevent discharge of current from the battery.
the solar will charge the rechargeable battery back up and also charge the battery phone directly. if NO solar energy, the back up battery can charge the phone.
as at the pic controller, there have power supply circuit which using voltage regulator of 7805 to convert the DC voltage from 9V to 5VDC. this is because the 5VDC using to operated the PIC and relay driver. PIC will show the value of voltage and the relay will be as a switch to cut off the current when the charger fully charge. then, it will avoid overcharging.
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