Noise properties of pulse-width modulated power converters: open-loop effects

Pallab Midya; Philip T. Krein

doi:10.1109/63.892828

Noise properties of pulse-width modulated power converters: open-loop effects

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Abstract

The pulse-width modulation (PWM) process in dc-dc and dc-ac converters introduces characteristic nonlinear behavior. When PWM is performed in the presence of noise, specific effects are seen on the duty ratio and consequently on the output of the converter. Small-signal concepts do not model nonlinear noise issues. Here, the probability density function of the duty ratio and its implications are obtained analytically, given external noise that follows a Gaussian distribution. The results are verified with Monte Carlo simulation and confirmed by experiments. For a dc-dc converter, noise is shown to introduce a dc shift at the output. The degree of nonlinear effect on a converter depends on the noise derivative level. For an inverter, noise can produce significant dc offset at the output. Closed-form expressions from the analysis can be used to evaluate noise sensitivity of a design.

Original language	English (US)
Pages (from-to)	1134-1143
Number of pages	10
Journal	IEEE Transactions on Power Electronics
Volume	15
Issue number	6
DOIs	https://doi.org/10.1109/63.892828
State	Published - Nov 2000

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Electrical and Electronic Engineering

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10.1109/63.892828

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title = "Noise properties of pulse-width modulated power converters: open-loop effects",

abstract = "The pulse-width modulation (PWM) process in dc-dc and dc-ac converters introduces characteristic nonlinear behavior. When PWM is performed in the presence of noise, specific effects are seen on the duty ratio and consequently on the output of the converter. Small-signal concepts do not model nonlinear noise issues. Here, the probability density function of the duty ratio and its implications are obtained analytically, given external noise that follows a Gaussian distribution. The results are verified with Monte Carlo simulation and confirmed by experiments. For a dc-dc converter, noise is shown to introduce a dc shift at the output. The degree of nonlinear effect on a converter depends on the noise derivative level. For an inverter, noise can produce significant dc offset at the output. Closed-form expressions from the analysis can be used to evaluate noise sensitivity of a design.",

author = "Pallab Midya and Krein, {Philip T.}",

note = "Funding Information: Manuscript received March 31, 1998; revised July 14, 2000. This work was supported in part by the Power Affiliates Program, University of Illinois at Urbana-Champaign, and a Fulbright Scholarship from the Fulbright Commission in the U.K. Recommended by Associate Editor T. Sloane. P. Midya is with the Motorola Corporate Research Laboratory, Schaumburg, IL 60196 USA. P. T. Krein is with the Department of Electrical and Computer Engineering, University of Illinois, Urbana, IL 61801 USA. Publisher Item Identifier S 0885-8993(00)09800-8.",

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N1 - Funding Information: Manuscript received March 31, 1998; revised July 14, 2000. This work was supported in part by the Power Affiliates Program, University of Illinois at Urbana-Champaign, and a Fulbright Scholarship from the Fulbright Commission in the U.K. Recommended by Associate Editor T. Sloane. P. Midya is with the Motorola Corporate Research Laboratory, Schaumburg, IL 60196 USA. P. T. Krein is with the Department of Electrical and Computer Engineering, University of Illinois, Urbana, IL 61801 USA. Publisher Item Identifier S 0885-8993(00)09800-8.

PY - 2000/11

Y1 - 2000/11

N2 - The pulse-width modulation (PWM) process in dc-dc and dc-ac converters introduces characteristic nonlinear behavior. When PWM is performed in the presence of noise, specific effects are seen on the duty ratio and consequently on the output of the converter. Small-signal concepts do not model nonlinear noise issues. Here, the probability density function of the duty ratio and its implications are obtained analytically, given external noise that follows a Gaussian distribution. The results are verified with Monte Carlo simulation and confirmed by experiments. For a dc-dc converter, noise is shown to introduce a dc shift at the output. The degree of nonlinear effect on a converter depends on the noise derivative level. For an inverter, noise can produce significant dc offset at the output. Closed-form expressions from the analysis can be used to evaluate noise sensitivity of a design.

AB - The pulse-width modulation (PWM) process in dc-dc and dc-ac converters introduces characteristic nonlinear behavior. When PWM is performed in the presence of noise, specific effects are seen on the duty ratio and consequently on the output of the converter. Small-signal concepts do not model nonlinear noise issues. Here, the probability density function of the duty ratio and its implications are obtained analytically, given external noise that follows a Gaussian distribution. The results are verified with Monte Carlo simulation and confirmed by experiments. For a dc-dc converter, noise is shown to introduce a dc shift at the output. The degree of nonlinear effect on a converter depends on the noise derivative level. For an inverter, noise can produce significant dc offset at the output. Closed-form expressions from the analysis can be used to evaluate noise sensitivity of a design.

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Noise properties of pulse-width modulated power converters: open-loop effects

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