Hint for CQ5-B: Use the MATLAB script in the CQ5-B to re-plot uncompensated open loop transfer function, . Find “given post compensation cross over frequency” on the plot;now you should be able to read phase from the plot at post compensation cross over frequency and calculate phase margin. Set your desired phase margin goal. At this stage, you have to read Procedure I in “Type III Compensator Design for Power Converters” by Liyu Cao [published in Power Electronics Technology, January 2011]. While you are reading this reference, you should be able to do following steps: Based on your phase margin goal, you should be able to calculate how much boost you need from type 3 compensator. Find K, separation factor based on the amount of boost you calculated in 5.a. You can calculate ?z1,?z2, ?p1, and ?p1. For finding KPWM*?I, please note that you should put magnitude of total compensated open loop transfer function, , equal 1. Please note that is the transfer function for type 3 compensator. You can also do:20 log?? =0?. Document Preview:

Hint for CQ5-B: Use the MATLAB script in the CQ5-B to re-plot uncompensated open loop transfer function, . Find “given post compensation cross over frequency” on the plot; now you should be able to read phase from the plot at post compensation cross over frequency and calculate phase margin. Set your desired phase margin goal. At this stage, you have to read Procedure I in “Type III Compensator Design for Power Converters” by Liyu Cao [published in Power Electronics Technology, January 2011]. While you are reading this reference, you should be able to do following steps: Based on your phase margin goal, you should be able to calculate how much boost you need from type 3 compensator. Find K, separation factor based on the amount of boost you calculated in 5.a. You can calculate ?z1, ?z2, ?p1, and ?p1. For finding KPWM*?I, please note that you should put magnitude of total compensated open loop transfer function, , equal 1. Please note that is the transfer function for type 3 compensator. You can also do: 20log=0.

Attachments:

Hint-for-Q5.docxCQ-5B-9-2-201….pdfType3Compensa….pdf