Improved Delta-Sigma Modulator for Direct Switch Control of a DC-DC Converter

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Abstract

Digital Delta-Sigma modulators can be an interesting alternative to Pulse Width Modulation for generating switching signals of a power converter. Their noise-shaping behavior results in low output distortion for output frequencies well below the modulation frequency. To directly generate the switch control signals of a traditional DC-DC converter, a first-order modulator with a two-level quantizer is preferred as they are inherently stable for the entire output range. However, the noise attenuation of a first-order modulator is limited to 20dB per decade for frequencies below the modulation frequency. Additionally, they suffer from limit cycles due to the low modulator order and 2-level quantizer resolution. To overcome this problem, a fast feedback loop is proposed that acts on disturbances introduced by the quantizer and compensates low frequency noise. As a result, an improved Delta-Sigma modulator is obtained that remains stable for almost the entire output range but also provides improved noise attenuation like that of a second-order modulator. Moreover, the output noise signature is whitened resulting in less power being present at the limit cycle frequencies.

Original languageEnglish
Title of host publication2023 IEEE Applied Power Electronics Conference and Exposition (APEC)
PublisherInstitute of Electrical and Electronics Engineers
Pages2881-2887
Number of pages7
ISBN (Electronic)978-1-6654-7539-6
DOIs
Publication statusPublished - 2023
Event38th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023 - Orlando, United States
Duration: 19 Mar 202323 Mar 2023

Conference

Conference38th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023
Country/TerritoryUnited States
CityOrlando
Period19/03/2323/03/23

Keywords

  • Control
  • DC-DC Converter
  • Delta-Sigma Modulation
  • Feedback
  • Limit Cycles
  • Noise

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