宽范围高效率双有源桥DC-AC变换器拓扑及其调制技术

doi:10.19595/j.cnki.1000-6753.tces.251367

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Abstract The dual active bridge（DAB）DC-AC converter faces challenges such as limited soft-switching range, high current stress, and low efficiency across a wide input voltage and load range. Although existing modulation strategies can enhance the performance of DAB converters, they typically require complex control and impose a high computational burden. As for topological improvements, most solutions are constrained by either a narrow input voltage range or structural complexity. Thus, a topology-construction concept for the DC-AC converter is proposed. The proposed approach dynamically adjusts the DAB stage's input voltage via a DC-DC converter, ensuring consistent operation under voltage-matching conditions.
The two-stage four-switch Buck-Boost（FSBB）cascaded DAB-DC-AC converter is selected as an example. The front-stage FSBB converter employs a Buck-Boost modulation strategy. By introducing the intermediate
bus-voltage reference $ v_{\mathrm{bus}}^{*} $ and the input voltage V_dc, the FSBB implements a composite control scheme that combines voltage feedforward and bus-voltage closed-loop control, ensuring fast and accurate bus-voltage tracking. Under the voltage-matching condition, the DAB-DC-AC converter does not require complex modulation and control strategies. Thus, the DAB stage employs single-phase-shift（SPS）modulation with a single PI controller to achieve stable, efficient power conversion.
A 500 W experimental prototype has been built. Experimental results indicate that under the input voltage range of 32 V to 62 V, the proposed topology maintains a stable inductor L_k current stress of 8.4 A, which is significantly lower than the 16.2 A to 29.2 A in the single-stage DAB-DC-AC converter. In terms of soft-switching range, the single-stage DAB-DC-AC converter achieves zero-voltage switching（ZVS）for the switches only when the output voltage exceeds 126 V at an input voltage of 32 V. As the input voltage increases, the soft-switching range gradually decreases. In contrast, the proposed topology achieves ZVS at output voltages above 91 V under the same input conditions, with minimal sensitivity to input-voltage variations. In terms of efficiency, while the FSBB stage introduces additional switching and inductor losses, the DAB stage achieves lower losses due to its wider soft-switching range and lower inductor current. The proposed topology can maintain an efficiency range of 94.56%~95.65% across different input voltages. Over a wide load range, it can also achieve a stable, high-efficiency output compared with a single-stage DAB-DC-AC converter.
The feasibility of the proposed topology construction is verified through theoretical analysis and tests. It simplifies the control structure of the DAB stage, reduces current stress, and enhances overall system performance across a wide range of input voltages and loads. Furthermore, it demonstrates a viable approach to designing isolated DC-AC converters across a wide range of operating conditions.

Key words： Dual active bridge DC-AC converter four-switch buck-boost converter wide input voltage wide load range high efficiency

Received: 06 August 2025

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	Chen Qiang
	Zhao Zhigang
	Wang Shilong
	Ma Mingyao
	Zhang Xing

Cite this article:

Chen Qiang,Zhao Zhigang,Wang Shilong等. Topology and Modulation Technology of Wide-Range High-Efficiency Dual Active Bridge-DC-AC Converter[J]. Transactions of China Electrotechnical Society, 2026, 41(16): 5551-5563.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.251367 OR https://dgjsxb.ces-transaction.com/EN/Y2026/V41/I16/5551

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