Hello, for my GCSE Project I am making a solar powered power bank. I found a circuit online and made a few edits to it. Here is my circuit.
The 12v DC power source is representing the solar panel and the 5v battery is the Lithium IPhone battery. The current going into the IPhone battery is 538.93mA as shown. When the circuit is on, the transistor is showing a power dissipation between 2W and 3.5W. What I'm wondering if this will make the transistor too hot and if i'd need a heat sink or something like that. Or maybe if there is a different transistor I can use that will allow a collector current of ~500mA. The transistor I'm using right now is a 2N2222A NPN.
My final question is that I tried making a virtual breadboard of this circuit, and sometimes the transistor would blow up due to an Emitter-Base voltage of 6v exceeding the max limit of 5v. How do I combat this? The voltage at the base is ~7.16v and ~6.26 at the emitter. In case it's needed, the voltage at the collector is ~10.96.
This is the original circuit which i found on the internet (before I changed some things myself).
Thanks in advance,
Sid
The 12v DC power source is representing the solar panel and the 5v battery is the Lithium IPhone battery. The current going into the IPhone battery is 538.93mA as shown. When the circuit is on, the transistor is showing a power dissipation between 2W and 3.5W. What I'm wondering if this will make the transistor too hot and if i'd need a heat sink or something like that. Or maybe if there is a different transistor I can use that will allow a collector current of ~500mA. The transistor I'm using right now is a 2N2222A NPN.
My final question is that I tried making a virtual breadboard of this circuit, and sometimes the transistor would blow up due to an Emitter-Base voltage of 6v exceeding the max limit of 5v. How do I combat this? The voltage at the base is ~7.16v and ~6.26 at the emitter. In case it's needed, the voltage at the collector is ~10.96.
This is the original circuit which i found on the internet (before I changed some things myself).
Thanks in advance,
Sid
Attachments
-
40.5 KB Views: 2