A digital technique to measure the loop gain of power converters

Fran González-Espín, Emilio Figueres, Gabriel Garcera, Raúl González, O. Carranza, L. G. González

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

The study of the loop gains frequency response in a power converter is a powerful tool commonly used for the design of the controllers used in the control stage. As the control of medium and high power electronic converters is usually performed digitally, it is useful to find a method to measure the digital loop gains. The purpose of this paper is to present a method for properly measuring the loop gain frequency response of digitally controlled power converters by means of an analog Frequency Response Analyzer (FRA). An analog sinusoidal reference signal generated by the FRA is injected through an Analog to Digital Converter (ADC) into the digital controller, and added to the discrete feedback signal. To obtain the frequency response of the open loop gain, both feedback and disturbed feedback signals are sent back to the FRA by using the Pulse Width Modulation (PWM) peripherals of the controller.

Original languageEnglish
Title of host publication2009 13th European Conference on Power Electronics and Applications, EPE '09
StatePublished - 2009
Externally publishedYes
Event2009 13th European Conference on Power Electronics and Applications, EPE '09 - Barcelona, Spain
Duration: 8 Sep 200910 Sep 2009

Publication series

Name2009 13th European Conference on Power Electronics and Applications, EPE '09

Conference

Conference2009 13th European Conference on Power Electronics and Applications, EPE '09
Country/TerritorySpain
CityBarcelona
Period8/09/0910/09/09

Keywords

  • Converter control
  • DSP
  • Measurement

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