In a single-phase full-wave bridge circuit and in a three-phase, delta full-wave bridge circuit, what will be the ripple voltage frequency respectively?

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BPSC AE Paper 6 (Electrical) 25 Mar 2022 Official Paper
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  1. Both will be twice the line frequency
  2. Both will be six times the line frequency
  3. Twice the line frequency, six times the line frequency
  4. None of the above

Answer (Detailed Solution Below)

Option 3 : Twice the line frequency, six times the line frequency
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Detailed Solution

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Concept:

Ripple frequency of three-phase full-wave converter:

F1 Jai.P 21-12-20 Savita D17

Figure: output voltage waveform of three-phase full-wave rectifier.

From the above output voltage waveform, we can observe that for a complete one cycle of input supply we got 6 pulses in the output.

So, the three-phase full-wave ac to dc converter is a 6-pulse converter.

Then the ripple frequency of the output f0 = m × f

Where,

m = number of pulses in the output per one complete cycle of the input

f = supply voltage frequency

Solution:

For single-phase full-wave bridge circuit f0 = 2 × f

For a three-phase full-wave converter f0 = 6 × f

Hence, the ratio output ripple-frequency to the supply-voltage frequency = f0 / f = 6

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