Single-Stage Wireless Battery Charging Circuit with Coupling Coefficient Prediction

This paper proposes a single-stage wireless battery charging circuit with a coupling coefficient prediction method. The proposed circuit consists of only two stages: full bridge inverter with transmitter coil in the first stage and full bridge rectifier with receiver coil in the second stage. This c...

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Autores principales:	Sang-Won Lee, Young-Kyun Cho
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	wireless power transfer (WPT) circuit series-series compensation wireless battery charger Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/87596be8cde4467986a579361a6c4861
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spelling	oai:doaj.org-article:87596be8cde4467986a579361a6c48612021-11-11T15:38:09ZSingle-Stage Wireless Battery Charging Circuit with Coupling Coefficient Prediction10.3390/electronics102126152079-9292https://doaj.org/article/87596be8cde4467986a579361a6c48612021-10-01T00:00:00Zhttps://www.mdpi.com/2079-9292/10/21/2615https://doaj.org/toc/2079-9292This paper proposes a single-stage wireless battery charging circuit with a coupling coefficient prediction method. The proposed circuit consists of only two stages: full bridge inverter with transmitter coil in the first stage and full bridge rectifier with receiver coil in the second stage. This circuit implements the constant current (CC) charging mode at the resonant frequency of two coils and the constant voltage (CV) charging mode at a specific frequency that is dependent on the coupling coefficient of two coils. The operation at a specific frequency guarantees the CV operation regardless of load condition and reduces the switching losses than the operation at the resonant frequency owing to a zero-voltage switching (ZVS) operation. In CC-CV modes, the phase-shift technique is additionally applied to improve the output voltage/current regulation. Unlike other approaches, the proposed single-stage wireless battery charging circuit does not require multiple stages of power conversion, or additional components, a pre-measured coupling coefficient or a complex control algorithm for CC-CV charging operation. The prototype proposed circuit was tested under various coil alignment conditions, and successfully implemented the CC-CV charging operation for a 36 V battery pack. The predicted coupling coefficient had an error of ≤0.62% in the coil alignment condition, and the circuit had errors of ≤0.32%, ≤0.1% in the output current and voltage regulation, respectively.Sang-Won LeeYoung-Kyun ChoMDPI AGarticlewireless power transfer (WPT) circuitseries-series compensationwireless battery chargerElectronicsTK7800-8360ENElectronics, Vol 10, Iss 2615, p 2615 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	wireless power transfer (WPT) circuit series-series compensation wireless battery charger Electronics TK7800-8360
spellingShingle	wireless power transfer (WPT) circuit series-series compensation wireless battery charger Electronics TK7800-8360 Sang-Won Lee Young-Kyun Cho Single-Stage Wireless Battery Charging Circuit with Coupling Coefficient Prediction
description	This paper proposes a single-stage wireless battery charging circuit with a coupling coefficient prediction method. The proposed circuit consists of only two stages: full bridge inverter with transmitter coil in the first stage and full bridge rectifier with receiver coil in the second stage. This circuit implements the constant current (CC) charging mode at the resonant frequency of two coils and the constant voltage (CV) charging mode at a specific frequency that is dependent on the coupling coefficient of two coils. The operation at a specific frequency guarantees the CV operation regardless of load condition and reduces the switching losses than the operation at the resonant frequency owing to a zero-voltage switching (ZVS) operation. In CC-CV modes, the phase-shift technique is additionally applied to improve the output voltage/current regulation. Unlike other approaches, the proposed single-stage wireless battery charging circuit does not require multiple stages of power conversion, or additional components, a pre-measured coupling coefficient or a complex control algorithm for CC-CV charging operation. The prototype proposed circuit was tested under various coil alignment conditions, and successfully implemented the CC-CV charging operation for a 36 V battery pack. The predicted coupling coefficient had an error of ≤0.62% in the coil alignment condition, and the circuit had errors of ≤0.32%, ≤0.1% in the output current and voltage regulation, respectively.
format	article
author	Sang-Won Lee Young-Kyun Cho
author_facet	Sang-Won Lee Young-Kyun Cho
author_sort	Sang-Won Lee
title	Single-Stage Wireless Battery Charging Circuit with Coupling Coefficient Prediction
title_short	Single-Stage Wireless Battery Charging Circuit with Coupling Coefficient Prediction
title_full	Single-Stage Wireless Battery Charging Circuit with Coupling Coefficient Prediction
title_fullStr	Single-Stage Wireless Battery Charging Circuit with Coupling Coefficient Prediction
title_full_unstemmed	Single-Stage Wireless Battery Charging Circuit with Coupling Coefficient Prediction
title_sort	single-stage wireless battery charging circuit with coupling coefficient prediction
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/87596be8cde4467986a579361a6c4861
work_keys_str_mv	AT sangwonlee singlestagewirelessbatterychargingcircuitwithcouplingcoefficientprediction AT youngkyuncho singlestagewirelessbatterychargingcircuitwithcouplingcoefficientprediction
_version_	1718434810443071488

Single-Stage Wireless Battery Charging Circuit with Coupling Coefficient Prediction

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