Formulation of PID control for dc-dc converters based on capacitor current: A geometric context

Santanu Kapat, Philip T. Krein

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The output-voltage-derivative term of a proportional-integral-derivative (PID) controller injects significant noise in a dc-dc converter. This is mainly due to the presence of parasitic resistance and inductance of the output capacitor. Particularly during a large-signal transient, noise injection significantly degrades phase margin. Although noise characteristics can be improved by reducing the cut-off frequency of the low-pass filter associated with the voltage derivative, it degrades the closed-loop bandwidth. A new formulation of a PID controller is introduced to replace the output-voltage-derivative with information about the capacitor current, thus reducing noise injection. It is shown this new formulation preserves the fundamental principle of a PID controller and incorporates a load current feed-forward as well as inductor current dynamics. This can be helpful to further improve bandwidth and phase margin. The proposed method is shown to be equivalent to a voltage-mode controlled buck converter and a current-mode controlled boost converter with a PID controller in the voltage feedback loop.

Original languageEnglish (US)
Title of host publication2010 IEEE 12th Workshop on Control and Modeling for Power Electronics, COMPEL 2010
DOIs
StatePublished - Oct 22 2010
Event2010 IEEE 12th Workshop on Control and Modeling for Power Electronics, COMPEL 2010 - Boulder, CO, United States
Duration: Jun 28 2010Jun 30 2010

Publication series

Name2010 IEEE 12th Workshop on Control and Modeling for Power Electronics, COMPEL 2010

Other

Other2010 IEEE 12th Workshop on Control and Modeling for Power Electronics, COMPEL 2010
CountryUnited States
CityBoulder, CO
Period6/28/106/30/10

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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    Kapat, S., & Krein, P. T. (2010). Formulation of PID control for dc-dc converters based on capacitor current: A geometric context. In 2010 IEEE 12th Workshop on Control and Modeling for Power Electronics, COMPEL 2010 [5562368] (2010 IEEE 12th Workshop on Control and Modeling for Power Electronics, COMPEL 2010). https://doi.org/10.1109/COMPEL.2010.5562368