Adc quantization effects in two-loop digital current controlled dc-dc power converters: Analysis and design guidelines

Catalina González-Castaño, Carlos Restrepo, Roberto Giral, Enric Vidal-Idiarte, Javier Calvente

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

This paper analyzes the presence of undesired quantization-induced perturbations (QIP) in a dc-dc buck-boost converter using a two-loop digital current control. This work introduces design conditions regarding control laws gains and signal quantization to avoid the quantization effects due to the addition of the outer voltage loop in a digital current controlled converter. The two-loop controller is composed of a multisampled average current control (MACC) in the inner current-programmed loop and a proportional-integrator compensator at the external loop. QIP conditions have been evaluated through simulations and experiments using a digitally controlled pulse width modulation (DPWM) buck-boost converter. A 400 V 1.6 kW proof-of-concept converter has been used to illustrate the presence of QIP and verify the design conditions. The controller is programmed in a digital signal controller (DSC) TMS320F28377S with a DPWM with 8.96-bit equivalent resolution, a 12-bit ADC for current sampling, and a 12-bit ADC for voltage sampling or a 16-bit ADC for voltage error sampling.

Original languageEnglish
Article number7179
Pages (from-to)1-15
Number of pages15
JournalApplied Sciences (Switzerland)
Volume10
Issue number20
DOIs
Publication statusPublished - 2 Oct 2020
Externally publishedYes

Keywords

  • Dc-dc power converter
  • Digital control
  • Limit-cycle oscillation (LCO)
  • Multisampled average current control (MACC)
  • Quantization-induced perturbations (QIP)

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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