Use of Sigma-Delta modulation to control EMI from switchmode power supplies
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 (����) modulation is proposed as an alternative switching technique to reduce conducted EMI from SMPS. The...
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ndltd-ORGSU-oai-ir.library.oregonstate.edu-1957-336352012-09-19T03:59:42ZUse of Sigma-Delta modulation to control EMI from switchmode power suppliesParamesh, Jeyanandh K.Modulation (Electronics)Electromagnetic interferenceSwitching power suppliesConducted 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 (����) modulation is proposed as an alternative switching technique to reduce conducted EMI from SMPS. The result of using ���� 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 ���� 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.Graduation date: 1999von Jouanne, Annette2012-09-18T19:54:06Z2012-09-18T19:54:06Z1998-07-071998-07-07Thesis/Dissertationhttp://hdl.handle.net/1957/33635en_US |
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en_US |
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Modulation (Electronics) Electromagnetic interference Switching power supplies |
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Modulation (Electronics) Electromagnetic interference Switching power supplies Paramesh, Jeyanandh K. Use of Sigma-Delta modulation to control EMI from switchmode power supplies |
description |
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 (����) modulation is proposed as an alternative switching technique to reduce conducted EMI from SMPS. The result of using ���� 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 ����
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. === Graduation date: 1999 |
author2 |
von Jouanne, Annette |
author_facet |
von Jouanne, Annette Paramesh, Jeyanandh K. |
author |
Paramesh, Jeyanandh K. |
author_sort |
Paramesh, Jeyanandh K. |
title |
Use of Sigma-Delta modulation to control EMI from switchmode power supplies |
title_short |
Use of Sigma-Delta modulation to control EMI from switchmode power supplies |
title_full |
Use of Sigma-Delta modulation to control EMI from switchmode power supplies |
title_fullStr |
Use of Sigma-Delta modulation to control EMI from switchmode power supplies |
title_full_unstemmed |
Use of Sigma-Delta modulation to control EMI from switchmode power supplies |
title_sort |
use of sigma-delta modulation to control emi from switchmode power supplies |
publishDate |
2012 |
url |
http://hdl.handle.net/1957/33635 |
work_keys_str_mv |
AT parameshjeyanandhk useofsigmadeltamodulationtocontrolemifromswitchmodepowersupplies |
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1716392960818413568 |