What is the output of a 3 phase rectifier compared to its input?

In a three-phase rectifier, the output voltage is typically higher than the input AC voltage. This is due to the way three-phase systems function and how rectification converts AC to DC.

For three-phase systems, the average output voltage can be calculated as a function of the input line-to-line RMS voltage. The relationship is generally expressed as:

[ V_{dc} = \frac{3 \sqrt{3}}{\pi} V_{LL} ]

where ( V_{LL} ) represents the line-to-line RMS voltage of the input. This equation shows that the output DC voltage is a factor of the input voltage. The value approximately equates to 1.33 times the input line-to-line voltage when calculated.

Thus, the output of a three-phase rectifier compared to its input is around 1.33 times the input value, confirming that the correct answer is an increase by a factor of 1.33. This increase is beneficial in applications requiring higher voltage levels or ensuring that the rectified output meets the needs of load demands effectively.