Someone asked: How is apparent power calculated?
Apparent power from the source (see study book) is the product of the rms value of the source voltage and the rms value of the source current. The voltage is sinusoidal, so its rms value is its peak value (which is 340 V) divided by the square root of 2 and this gives 240.4 V. The current is not sinusoidal, but its fourier series is given. Therefore its rms value has been calculated by the formula given as equation 3.44 of the study book. Excecise 5.2 Someone said: In the solution to the question which refers to a step-up converter, the equation for the step-down conveter has been used to calculate critical current. My response: You will see that the formula used in the workbook is the same as equation 5.33 if you realise that for a boost converter output voltage is (input voltage)/(1-D). So equation 5.33 has been used, not equation 5.18. It is a coincidence that when you substitute Vd/(1-D) for Vo in equation 5.33 you get equation 5.18.
