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The development of uninterruptible power supply systems, battery chargers, grid-tie inverters for solar panels and other systems requires DC-AC conversion of electrical energy. For safety reasons, galvanic isolation of the input and output circuits of the converter is mandatory. Therefore, the development of DC-AC converters with required energetic and weight-and-dimensional characteristics is an actual issue. In this work, on the basis of a literature review of converter circuit designs used to solve the designated tasks, the ways to improve the efficiency of DC-AC converter circuits are identified, in particular transition away from double energy conversion in favor of direct conversion and the use of resonant circuits in the power circuit to reduce switching losses in the converter. A circuit topology is proposed, a control algorithm is described, and methods of power components parameter selection are given for a bidirectional resonant DC-AC converter suitable for building uninterruptible power supply systems, battery chargers, and other systems requiring DC-AC conversion with galvanic isolation. A distinctive feature of the proposed circuit is that the conversion is performed in a single stage, without an intermediate DC link with energy storage. This allows for improved weight-and-dimensional and cost characteristics of the final products. A mathematical description of the converter operation is presented, analytical expressions for equivalent parameters have been derived, and converter control capabilities in various operation modes are examined. The results of experimental testing of a prototype converter in DC-AC and AC-DC conversion modes are given, confirming its operability and the validity of the presented theoretical calculations.

Key words: direct converter, resonant converter, bidirectional converter, LLC converter, uninterruptible power supply, isolated converter, frequency control, pulse-width modulation
Published in: INTEGRATED RADIOELECTRONIC DEVICES
Bibliography link: Burlaka V. V., Gulakov S. V., Golovin A. Yu. Bidirectional isolated resonant DC-AC converter. Izv. vuzov. Elektronika = Proc. Univ. Electronics. 2026;31(1):58–68. (In Russ.). https://doi.org/10.24151/1561-5405-2026-31-1-58-68.
Financial source: the work has been supported by the Ministry of Education and Science of the Russian Federation (Agreement no. 075-03-2024-177).

Vladimir V. Burlaka
Priazovskiy State Technical University – branch of National Research University “Moscow State University of Civil Engineering”, Russia, 287642, Donetsk People’s Republic, Mariupol, Universitetskaya st., 7

Sergey V. Gulakov
Priazovskiy State Technical University – branch of National Research University “Moscow State University of Civil Engineering”, Russia, 287642, Donetsk People’s Republic, Mariupol, Universitetskaya st., 7

Andrey Yu. Golovin
Priazovskiy State Technical University – branch of National Research University “Moscow State University of Civil Engineering”, Russia, 287642, Donetsk People’s Republic, Mariupol, Universitetskaya st., 7

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UDK: 621.341.572
Publication type: Scientific article
Source lang: Russian
DOI: 10.24151/1561-5405-2026-31-1-58-68
RISC id: MISDXC

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