Use of Sigma-Delta modulation to control EMI from switchmode power supplies Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/hd76s2785

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Conducted Electromagnetic Interference (EMI) is a major cause of concern in switchmode power supplies (SMPS) which commonly use standard pulsewidth modulation (PWM). In this thesis, Sigma-Delta (ΣΔ) modulation is proposed as an alternative switching technique to reduce conducted EMI from SMPS. The result of using ΣΔ modulation is a spread in the spectrum of the conducted emissions so that large concentrations of power at discrete frequencies are avoided. Experimental time-domain waveforms and spectra of the switching function from first-order and second-order ΣΔ modulators are presented to prove the viability of the scheme in EMI mitigation. These modulators are then applied to an off-the-shelf computer power supply and experimental results using FCC-specified methods show a reduction of roughly 5-10dB in EMI emissions over standard PWM modulators.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Submitted by John Valentino (valentjo@onid.orst.edu) on 2012-09-17T21:45:20Z No. of bitstreams: 1 ParameshJeyanandhK1999.pdf: 4120035 bytes, checksum: f900582dfaa4570e206ffb00451c7c18 (MD5)
  • description.provenance : Made available in DSpace on 2012-09-18T19:54:06Z (GMT). No. of bitstreams: 1 ParameshJeyanandhK1999.pdf: 4120035 bytes, checksum: f900582dfaa4570e206ffb00451c7c18 (MD5) Previous issue date: 1998-07-07
  • description.provenance : Item restricted to the OSU community at the authors request by Steve Van Tuyl. 9 March, 2015
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-18T19:52:24Z (GMT) No. of bitstreams: 1 ParameshJeyanandhK1999.pdf: 4120035 bytes, checksum: f900582dfaa4570e206ffb00451c7c18 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-18T19:54:06Z (GMT) No. of bitstreams: 1 ParameshJeyanandhK1999.pdf: 4120035 bytes, checksum: f900582dfaa4570e206ffb00451c7c18 (MD5)

Relationships

In Administrative Set:
Last modified: 08/09/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items