Modeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application

In this paper, a comparative analysis of the average switch/inductor current between ideal and non-ideal buck and synchronous buck converters is performed and verified against a standard LTspice model. The mathematical modeling of the converters was performed using volt-sec and amp-sec balance equat...

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Autores principales:	Sumukh Surya, Mohan Krishna Srinivasan, Sheldon Williamson
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	average current control continuous conduction mode LTspice MATLAB/Simulink mathematical modeling non-ideal buck converter Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/968bb9ae6ede4f35bb3ea6b3ff4c8162
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id	oai:doaj.org-article:968bb9ae6ede4f35bb3ea6b3ff4c8162
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spelling	oai:doaj.org-article:968bb9ae6ede4f35bb3ea6b3ff4c81622021-11-11T15:39:52ZModeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application10.3390/electronics102126722079-9292https://doaj.org/article/968bb9ae6ede4f35bb3ea6b3ff4c81622021-10-01T00:00:00Zhttps://www.mdpi.com/2079-9292/10/21/2672https://doaj.org/toc/2079-9292In this paper, a comparative analysis of the average switch/inductor current between ideal and non-ideal buck and synchronous buck converters is performed and verified against a standard LTspice model. The mathematical modeling of the converters was performed using volt-sec and amp-sec balance equations and analyzed using MATLAB/Simulink. The transients in the output voltage and the inductor current were observed. The transfer function of the switch current to the duty cycle (G<sub>id</sub>) in open loop configuration for low-power converters operating in continuous conduction mode (CCM) was modeled using thestate space averaging (SSA) technique and analyzed using MATLAB/Simulink. Initially, using the volt-sec and amp-sec, balance equations for the converters were modeled. The switch current to duty ratio (G<sub>id</sub>) was derived using the SSA technique and verified using standard average models available in LTspice software. Though the G<sub>id</sub> was derived using various methods in earlier works, the analyses of parameters such as low frequency gain, stability, resonant frequency and the location of poles and zeros were not presented. It was observed that the converters were stable, and the non-ideal converter showed smaller resonant frequency than the ideal converter due to the equivalent series resistances (ESR) of the inductor and the capacitor. The non-ideal converters showed higher stability than the ideal converters due to the placement of the poles closer to the s-plane. However, the G<sub>id</sub> of the non-ideal converters remained the same in the open loop configuration.Sumukh SuryaMohan Krishna SrinivasanSheldon WilliamsonMDPI AGarticleaverage current controlcontinuous conduction modeLTspiceMATLAB/Simulinkmathematical modelingnon-ideal buck converterElectronicsTK7800-8360ENElectronics, Vol 10, Iss 2672, p 2672 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	average current control continuous conduction mode LTspice MATLAB/Simulink mathematical modeling non-ideal buck converter Electronics TK7800-8360
spellingShingle	average current control continuous conduction mode LTspice MATLAB/Simulink mathematical modeling non-ideal buck converter Electronics TK7800-8360 Sumukh Surya Mohan Krishna Srinivasan Sheldon Williamson Modeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application
description	In this paper, a comparative analysis of the average switch/inductor current between ideal and non-ideal buck and synchronous buck converters is performed and verified against a standard LTspice model. The mathematical modeling of the converters was performed using volt-sec and amp-sec balance equations and analyzed using MATLAB/Simulink. The transients in the output voltage and the inductor current were observed. The transfer function of the switch current to the duty cycle (G<sub>id</sub>) in open loop configuration for low-power converters operating in continuous conduction mode (CCM) was modeled using thestate space averaging (SSA) technique and analyzed using MATLAB/Simulink. Initially, using the volt-sec and amp-sec, balance equations for the converters were modeled. The switch current to duty ratio (G<sub>id</sub>) was derived using the SSA technique and verified using standard average models available in LTspice software. Though the G<sub>id</sub> was derived using various methods in earlier works, the analyses of parameters such as low frequency gain, stability, resonant frequency and the location of poles and zeros were not presented. It was observed that the converters were stable, and the non-ideal converter showed smaller resonant frequency than the ideal converter due to the equivalent series resistances (ESR) of the inductor and the capacitor. The non-ideal converters showed higher stability than the ideal converters due to the placement of the poles closer to the s-plane. However, the G<sub>id</sub> of the non-ideal converters remained the same in the open loop configuration.
format	article
author	Sumukh Surya Mohan Krishna Srinivasan Sheldon Williamson
author_facet	Sumukh Surya Mohan Krishna Srinivasan Sheldon Williamson
author_sort	Sumukh Surya
title	Modeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application
title_short	Modeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application
title_full	Modeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application
title_fullStr	Modeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application
title_full_unstemmed	Modeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application
title_sort	modeling of average current in non-ideal buck and synchronous buck converters for low power application
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/968bb9ae6ede4f35bb3ea6b3ff4c8162
work_keys_str_mv	AT sumukhsurya modelingofaveragecurrentinnonidealbuckandsynchronousbuckconvertersforlowpowerapplication AT mohankrishnasrinivasan modelingofaveragecurrentinnonidealbuckandsynchronousbuckconvertersforlowpowerapplication AT sheldonwilliamson modelingofaveragecurrentinnonidealbuckandsynchronousbuckconvertersforlowpowerapplication
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Modeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application

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