Modeling and Controlling Strategy of Four-Switch Buck-boost Convertor with Smooth Mode Transitions
Wei-zhong Zhang1, 2, *, Hui-pin Lin3, Yao Zhang2, Ji-min Jin2
Identifiers and Pagination:Year: 2017
First Page: 57
Last Page: 67
Publisher Id: TOEEJ-11-57
Article History:Received Date: 08/09/2016
Revision Received Date: 07/11/2016
Acceptance Date: 07/11/2016
Electronic publication date: 28/02/2017
Collection year: 2017
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Four-switch synchronous buck-boost (FSBB) converter is much suitable for battery management system for its characteristic of wide input voltage range, high efficiency, and positive voltage output. A three mode control scheme with two modulation signals and one carrier can be adopted to achieve the smooth transition among modes. Using feed forward voltage mode control, the input voltage information is injected into the control loop to prevent the disturbance effect on the output voltage through making input voltage construct the carrier signal. High efficiency is gained when the converter is operating in pulse skip mode in light load. The operating mode smooth transition and stability could be achieved by modeling the converter and designing the compensation. Finally, a power prototype was fabricated to validate the validity of the control strategy.