Topic: Analog Circuits
Diodes in the following circuit are ideal. Which is the correct waveform across $R_{L}$?
(The circuit shows a transformer with $N_p=3$ and three secondary windings $N_{s1}=3$, $N_{s2}=6$, $N_{s3}=3$ with a multi-diode full-wave rectifying arrangement).
- A. Full-wave rectified sine wave with peak 10
- B. Full-wave rectified sine wave with equal peaks of 5
- C. Full-wave rectified sine wave with alternating peaks of 10 and 5
- D. Unrectified sine wave with peak 10
Answer: B. Full-wave rectified sine wave with equal peaks of 5
Explanation: During the positive half cycle, $D_1$ is ON, and current flows from $D_1$ through $R_L$ to point A. During the negative half cycle, $D_4$ is ON, and current flows to $R_L$ through $D_4$ and through point A. In both cases, the active secondary turns utilized relative to the primary ($N_p=3$) are effectively symmetric (turns ratio is 1:1 for the active loop), yielding a full-wave rectified output with equal peaks of 5V.