Concept:A bridge rectifier operates directly from a standard transformer secondary winding (or AC mains), eliminating the center tap. Furthermore, each diode in a bridge rectifier needs a Peak Inverse Voltage rating of only \(V_m\), compared to \(2V_m\) for a center-tapped rectifier.
Formula:$$\text{PIV}_{\text{Bridge}} = V_m \quad \text{vs} \quad \text{PIV}_{\text{Center-Tap}} = 2V_m$$
Solution:- Center-tapped rectifiers require a specialized transformer with a precise center tap and diodes rated for \(2V_m\).
- Bridge rectifiers utilize standard two-terminal transformer secondaries with diodes rated for \(V_m\).
- This makes bridge rectifiers more compact, cost-effective, and practical for most power supplies.
Why other options are incorrect:- Option A: Bridge rectifiers use 4 diodes, whereas center-tapped rectifiers use 2 diodes.
- Option C: Both rectifiers produce an output ripple frequency of \(2f\).
- Option D: Bridge rectifiers have two diode forward drops (\(2 \times 0.7\text{ V} = 1.4\text{ V}\)), which is higher than a center-tapped configuration (one diode drop).
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