Dear members of All About Circuits,
in a question I need to "Design a linear power supply consisting of a transformer, bridge rectifier and smoothing circuit, for use in the UK, to provide a + 15 V output for a load drawing 2500 mA. The ripple voltage should be set at 5 %."
This is what I have done so far.
1) Vp - (2*0.7)=15V -> Vp = 15 + 1.4 = 16.4
2) Determine the transformer
Vp=16.4, hence Vrms=16.4/(√2)=11.6Vrms
Turns ratio=n:1= 230Vrms/11.16Vrms ≈ 20 turns ratio
3)Value of the ripple voltage= 5% of 15V = 0.75Vr
4) Determine the frequency
UK Mains = 50Hz, ripple frequency = 100Hz
5) To Find C= (Iload)/(2f Vr)= 2.5A/(2*50*0.75)=33mF
Is this enough? Which figure shall I report as the VA rating?
Do all these components make the power supply linear?
I hope that someone can help me.
Thanks in advance!
All the best!
in a question I need to "Design a linear power supply consisting of a transformer, bridge rectifier and smoothing circuit, for use in the UK, to provide a + 15 V output for a load drawing 2500 mA. The ripple voltage should be set at 5 %."
This is what I have done so far.
1) Vp - (2*0.7)=15V -> Vp = 15 + 1.4 = 16.4
2) Determine the transformer
Vp=16.4, hence Vrms=16.4/(√2)=11.6Vrms
Turns ratio=n:1= 230Vrms/11.16Vrms ≈ 20 turns ratio
3)Value of the ripple voltage= 5% of 15V = 0.75Vr
4) Determine the frequency
UK Mains = 50Hz, ripple frequency = 100Hz
5) To Find C= (Iload)/(2f Vr)= 2.5A/(2*50*0.75)=33mF
Is this enough? Which figure shall I report as the VA rating?
Do all these components make the power supply linear?
I hope that someone can help me.
Thanks in advance!
All the best!