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

Yun Zhang; Yongping Gao; Jing Li; Mark Sumner

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

Vol. 18, No. 2, pp. 343-355, Mar. 2018

10.6113/JPE.2018.18.2.343

Asymmetric H-bridge

Bidirectional DC-DC converter

Common ground

Energy storage systems

Wide voltage-gain range

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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.

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Cite this article

[IEEE Style]

Y. Zhang, Y. Gao, J. Li, M. Sumner, "A Wide Voltage-Gain Range Asymmetric H-Bridge Bidirectional DC-DC Converter with a Common Ground for Energy Storage Systems," Journal of Power Electronics, vol. 18, no. 2, pp. 343-355, 2018. DOI: 10.6113/JPE.2018.18.2.343.

[ACM Style]

Yun Zhang, Yongping Gao, Jing Li, and Mark Sumner. 2018. A Wide Voltage-Gain Range Asymmetric H-Bridge Bidirectional DC-DC Converter with a Common Ground for Energy Storage Systems. Journal of Power Electronics, 18, 2, (2018), 343-355. DOI: 10.6113/JPE.2018.18.2.343.