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http://dx.doi.org/10.6113/JPE.2018.18.2.343

A Wide Voltage-Gain Range Asymmetric H-Bridge Bidirectional DC-DC Converter with a Common Ground for Energy Storage Systems  

Zhang, Yun (School of Electrical and Information Engineering, Tianjin University)
Gao, Yongping (School of Electrical and Information Engineering, Tianjin University)
Li, Jing (Department of Electrical and Electronic Engineering, University of Nottingham Ningbo China)
Sumner, Mark (Department of Electrical and Electronic Engineering, University of Nottingham)
Publication Information
Journal of Power Electronics / v.18, no.2, 2018 , pp. 343-355 More about this Journal
Abstract
A wide-voltage-conversion range bidirectional DC-DC converter is proposed in this paper. The topology is comprised of one typical LC energy storage component and a special common grounded asymmetric H-bridge with four active power switches/anti-parallel diodes. The narrow output PWM voltage is generated from the voltage difference between two normal (wider) output PWM voltages from the asymmetric H-bridge with duty cycles close to 0.5. The equivalent switching frequency of the output PWM voltage is double the actual switching frequency, and a wide step-down/step-up ratio range is achieved. A 300W prototype has been constructed to validate the feasibility and effectiveness of the proposed bidirectional converter between the variable low voltage side (24V~48V) and the constant high voltage side (200V). The slave active power switches allow ZVS turn-on and turn-off without requiring any extra hardware. The maximum conversion efficiency is 94.7% in the step-down mode and 93.5% in the step-up mode. Therefore, the proposed bidirectional topology with a common ground is suitable for energy storage systems such as renewable power generation systems and electric vehicles with a hybrid energy source.
Keywords
Asymmetric H-bridge; Bidirectional DC-DC converter; Common ground; Energy storage systems; Wide voltage-gain range;
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