M.A. Romashchenko1, A.V. Gudkov2, O.Yu. Makarov3

1-3 FSBEI of HE “Voronezh State Technical University” (Voronezh, Russia)

1 kipr@vorstu.ru; 2 avgdk@mail.ru; 3 kipr@vorstu.ru;

Formulation of the problem. One of the requirements for AC/DC converters is the minimization of conducted interference levels. The power circuit of many AC/DC converters with output power of 120 W and higher includes an active power factor corrector (PFC), which is one of the main sources of conducted electromagnetic interference. The presence of an additional PFC stage complicates the modeling of the entire converter. Separate schematic modeling of the PFC will allow verification of its conducted emission levels at early design stages, as well as enable optimization of this stage. Subsequent integration of this model into a unified AC/DC converter model will facilitate preliminary assessment of the electromagnetic compatibility (EMC) compliance and allow for a shorter development cycle by optimizing the converter more efficiently.

Purpose. To develop an algorithm for schematic modeling of the PFC in the LTspice environment, aimed at solving EMC compliance tasks for AC/DC converters.

Results. The proposed algorithm was used to develop a model of a 500 W active single-phase PFC. A comparison was made between the simulation results and the interference spectrum of the experimental PFC sample within the frequency range of 0.15 to 30 MHz. In the sub-range of 150-600 kHz, the maximum error was -4.4 dBμV. In the sub-range of 600 kHz to 5 MHz, the maximum error significantly increased to -23 dBμV. In the sub-range of 5 to 30 MHz, the maximum error was -5 dBμV.

Practical significance. The algorithm enables engineering assessment of the PFC's conducted interference level with the possibility of optimizing its circuit. As a result, it becomes possible to integrate the PFC model into a unified AC/DC converter model for preliminary EMC compliance testing. This will allow reducing the number of laboratory measurements and product revisions needed during debugging and refinement.

Romashchenko M.A., Gudkov A.V., Makarov O.Yu. Algorithm for modeling a power factor corrector for EMC compliance tasks // Radiotekhnika. 2026. V. 90. № 7. P. 18−23. DOI: https://doi.org/10.18127/j00338486-202607-03

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4. Romashchenko M.A., Gudkov A.V. Ekvivalentnaya model' silovogo kontura AC/DC-preobrazovatelya dlya skhemotekhnicheskogo analiza konduktivnyh pomekh. Doklady TUSUR. 2025. T. 28. № 2. S. 62–69. DOI: 10.21293/1818-0442-2025-28-2-62-69 (In Russian).