Power Electronics controlled rectifier solved example

[jaus tail]

Homework Statement

Homework Equations

Solved example

The Attempt at a Solution

I think the red part should be (alpha/firing angle) = 180 - 45
Here since the angle is 45, it makes no difference if you do 90 + 45 or 180 - 45, but i think it should be 180 - 45.
Am I right?

 

[gneill]

Yes, I believe that you are correct.