Hello everyone,
I am in need of help with this simple power supply circuit. (Please see my attachment)
1) I don't understand how to find the R value.
2) Basically, the turns ratio is also not told, then how do we find the secondary voltage?
3) Does the Rs resistor at the primary side of transformer mean anything in the calculation?
4) What is that Risolation doing? How do I bring it into my equations?
Would some people be so kind as to share some thoughts please?
I am really stuck, I could only start by calculating Vm=Vrms*sqrt(2).
The 5.1V is assumed to be the DC value of the filter (Capacitor) also?
If yes then with maximum ripple factor=5%, we get Vripple=0.255V. (Vripple/Vdc = ripple factor)
Then I don't know how to continue.
The information on Vdc: +/ 5% is useful?
Thank you very much for your help,
I am really in need of them.
I am in need of help with this simple power supply circuit. (Please see my attachment)
1) I don't understand how to find the R value.
2) Basically, the turns ratio is also not told, then how do we find the secondary voltage?
3) Does the Rs resistor at the primary side of transformer mean anything in the calculation?
4) What is that Risolation doing? How do I bring it into my equations?
Would some people be so kind as to share some thoughts please?
I am really stuck, I could only start by calculating Vm=Vrms*sqrt(2).
The 5.1V is assumed to be the DC value of the filter (Capacitor) also?
If yes then with maximum ripple factor=5%, we get Vripple=0.255V. (Vripple/Vdc = ripple factor)
Then I don't know how to continue.
The information on Vdc: +/ 5% is useful?
Thank you very much for your help,
I am really in need of them.
Attachments

54.8 KB Views: 23

72.2 KB Views: 21