Follow-up question about my understanding on rectification

  • #1
35
0

Main Question or Discussion Point

I understand the process of rectification but just only in theory. But I still have questions that I guess will be answered if I can experience or has experience about it (but sadly I don't have). Please kindly answer these questions:

1. Does the waveform of Vout can be considered as DC ( having imperfections in it) or it is still an AC?

2. Does the maximum voltage is still 220 VAC in the output waveform or I can apply the theoretical approach wherein there is some drop on LED (about 0.7 V) making the maximum voltage in the output waveform as 219.3 VAC?
rectifying.png
 

Answers and Replies

  • #2
1,176
214
1. Yes, DC. This is a basic topolgy of a half-wave rectifier
2. Output peak voltage is the same as input peak voltage (220√2 V), but output rms value is smaller.
 
  • #3
625
138
Q1 - yes you have a DC voltage at the output or ripple voltage. The DC voltage read by a voltmeter is around (√2 * 220V)/Π ≈ 99V
Q2- Without any load Vout = 220V but if you connect a load resistance the output voltage will drop about 0.7 V because the voltage droop across the diode.
 
  • #4
35
0
Q1 - yes you have a DC voltage at the output or ripple voltage. The DC voltage read by a voltmeter is around (√2 * 220V)/Π ≈ 99V
Q2- Without any load Vout = 220V but if you connect a load resistance the output voltage will drop about 0.7 V because the voltage droop across the diode.
If I add a load of 3k ohms (just for example). Does the output voltage will be sqrt(2)*220/2 - Vdrop of diode - Vdrop of resistor ?
 
  • #5
625
138
Yes, Vout = √2 * 220V/2 - 0.7V ≈ 154.8V
 

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