Bridge and center-trapped full wave rectifiers

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SUMMARY

The output DC voltage of a center-tapped rectifier is half that of a bridge rectifier when using the same transformer primary-to-secondary ratio. In a center-tapped configuration with two diodes, only half of the total secondary voltage is rectified during each half cycle. Conversely, a bridge rectifier utilizes four diodes to rectify the full secondary voltage on each half cycle of the mains waveform. This conclusion holds true even if the center-tapped transformer has a total secondary voltage that is double that of the bridge rectifier, excluding diode voltage drops.

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Why the output DC voltage of the center trapped rectifier is half that of a bridge rectifier??
 
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If you mean for the same transformer primary-to-secondary ratio but with the center tap used in one case (with 2 diodes) and with the the total winding used in the other (with 4 diodes in a bridge configuration) - then yes that's true. In the first case only half the total secondary voltage is rectified on each half cycle whereas in the latter case the full secondary voltage is rectified on each half cycle of the mains waveform. If the CT case had a different transformer with a total secondary voltage twice that of the other, then the result would be the same - ignoring the diode voltage drops.
 

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