PE #71: Improved Dynamic Model of Current-Mode-Controlled DC-DC Converters

This video shows the derivation of an improved dynamic model of current-mode-controlled dc-dc converters. The model is based on the analysis of the current-mode modulator in the discrete domain. A continuous model is also derived. Qspice simulations are shown to verify the model.

[@thavakkodi6290]

Sir great video as always . I am currently started working on Current control research for over current applications . Any materials ,tips to follow and authors to refer . information reg this would be helpful.😀

[@MarcosAlonsoElectronics]

Thanks for your comment

[@MarcosAlonsoElectronics]

20:00 The factor 0.85 is used to have the same DC output voltage in the simplified model as in the complete model. However, I realized later that by doing this we were also changing the amplitude of the perturbation of the simplified model. It is better to separate the DC and AC parts. See how on the corrected file available on GitHub: github.com/marcosalonsoelectronics/PE-71

[@MarcosAlonsoElectronics]

17:09 Another typo here. At the bottom of the slide the correct equation is wc=sqrt(12)*f as shown previously. Also: fc=wc/(2*pi)= 0.55*f. Sorry!

[@MarcosAlonsoElectronics]

All files are available here: github.com/marcosalonsoelectronics/PE-71

[@MarcosAlonsoElectronics]

13:52 There is a typo in the last equation. Instead of exp(sT) it should be exp(-sT). Sorry!

[@shaanvijaishankar5314]

Thank you for the video. How do add solve short circuit protection to this?

[@MarcosAlonsoElectronics]

You can add a voltage limiter at the output of the compensator. This will limit the transistor peak current and protect against short circuit. You have to measure the current through the transistor instead of the current through the inductor so that the transistor will be protected.