lecture 204

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1 Concordia University Department of Electrical and computer Engineering  ELEC – 6481 Lecture 4 Design of the controller (Course notes) Approach based on Bode Plots The main goal is t o choose and t une a contro lle r that adjusts the loop transfer function to an ideal gain vs. frequency profile (below). The cross-over frequency (bandwidth) can be chosen as 10 to 20 % of the switching frequency of the converter and the phase margin from 45 to 60°.  ω Gain(db) ωx -20 db/dec -40 db/dec -40 db/dec

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