Question

In a single-phase full converter, if output voltage has peak and average voltage values of 325V and 133V respectively, then the firing angle is

• A. 40 degrees
• B. 50 degrees
• C. 140 degrees
• D. 130 degrees

Hint:

For a single-phase full converter, the firing angle affects the average output voltage. The higher the firing angle, the lower the output voltage.

Answer 1

The Correct Option is B

The firing angle \( \alpha \) for a single-phase full converter can be calculated using the relation between the average and peak values of the output voltage. Using the formula: \[ V_{avg} = \frac{V_{peak}}{\pi} \times (1 + \cos(\alpha)) \] Given \( V_{avg} = 133V \) and \( V_{peak} = 325V \), solving the equation for \( \alpha \) gives: \[ \alpha = 50^\circ \] Thus, the correct answer is 50 degrees.