基于扩展移相下考虑死区时间效应的双有源桥变换器运行特性分析

doi:10.19595/j.cnki.1000-6753.tces.250955

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Abstract Dual-active-bridge (DAB) converters are widely used in power conversion systems due to their advantages, including high-frequency isolation, simple and symmetrical structure, high power density, and soft-switching capability. Existing research on optimized control strategies for DAB converters is primarily based on traditional ideal models that generally neglect dead time. Moreover, most studies on dead-time focus on specific shift modes under single-phase or multiple-phase shift control. Focusing on the increased dead-time effect caused by higher switching frequency, this paper investigates the operating characteristics of dual- active-bridge converters under extended-phase-shift (EPS) control in the presence of dead-time.
First, based on a simplified equivalent model of the DAB circuit, with a single bridge arm as the object of study, the influence of dead time on the converter's operating waveform is analyzed. The output square-wave voltage of the H-bridge on both sides is determined by the combination of switching devices through which the current flows. The output voltage of a single bridge arm is related only to the driving signal during non-dead-time periods of conduction. The direction of the inductor current determines it during dead-time periods without conduction signals. Secondly, based on the bridge arm theory and the position relationship between the zero-crossing point of the inductor current and the dead-time period of each bridge arm, the DAB converter under EPS control is categorized into 23 operating modes, and the inequality constraints for each mode are established. A transmission power correction model based on the voltage conversion ratio k and the dead-time ratio M is also developed to quantify the influence of dead-time on the transmission power characteristic curve. Subsequently, the converter's operating characteristics under dead time are analyzed. Across different combinations of constraints and phase-shift ratios, the dead-time effect exhibits distinct phenomena that significantly alter the converter's transmission power characteristics. The impact of the voltage conversion ratio k and the dead-time ratio M on the transmission power characteristics is compared. Moreover, a distribution diagram of operating modes across the entire operating range is constructed. Once a specific k-M relationship is satisfied, the distortion modes within a particular area can be eliminated. Then, the transmission power correction mode is further simplified based on classification criteria for boundary conditions and dead-zone phenomena. Finally, the theoretical analysis is verified using the experimental platform.
The following conclusions can be drawn. (1) The addition of dead-time causes a series of different dead-time effects in the converter under specific operating parameters and switch combinations. (2) The dead-time ratio M causes a deviation between the actual power model in operation and the traditional ideal power model, and the deviation is more significant when the external phase shift ratio D₂ is small, or the converter is operating in a light-load mode. (3) The proposed power correction model can accurately characterize the transmission characteristics of the converter under actual operating conditions, providing a basis for the precise power control and dead-time compensation design of DAB converters.

Key words： Dual-active-bridge converter dead-time effect extended-phase-shifting (EPS) voltage distortion transmission power characteristics

Received: 04 June 2025

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TM46

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	Wei Guangcan
	Chen Jianfei
	He Yigang
	Wu Cong

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Wei Guangcan,Chen Jianfei,He Yigang等. Analysis of the Operating Characteristics of Dual-Active-Bridge Converter Considering the Effect of Dead-Time under Extended-Phase-Shift Operation[J]. Transactions of China Electrotechnical Society, 2026, 41(10): 3353-3369.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.250955 OR https://dgjsxb.ces-transaction.com/EN/Y2026/V41/I10/3353

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