R.I. Zudov1, V.A. Sorotsky2, A.M. Ulanov3

1-3 Peter the Great St. Petersburg Polytechnic University (St. Petersburg, Russia)

1 rzudov@spbstu.ru; 2 sorotsky@mail.spbstu.ru; 3 ulan-bator-1955@mail.ru

Along with the high efficiency switch-mode generators have rather noticeable level of higher harmonics in the output voltage. To reduce the requirements for harmonic filters, a staircase voltage can be used. However, as research have shown, even a small shift in the stages’ angles (about 0.03°), caused by the deviation of parameters and electronic devices’ delays, leads to an increase of higher harmonics level up to minus 40 dB. Proceeding from statistical modeling, it has been shown that with a fixed norm of the error vector of the stages’ angles the level of higher harmonics can vary from minus 40 to minus 90 dB.

To reduce the influence of parameters’ dispersion, several methods can be used, the most effective and least labor-intensive of which is adjusting the pulses’ width using a neural network. It is shown that the effectiveness of this method is limited by the minimum possible step of pulse width regulation. In particular, from the simulation results it follows that for a three-stage voltage the level of the second and third harmonics can be reduced to values less than minus 60 dB with a probability close to 1 with a step of pulse width regulation less than 0.03% of the period.

Zudov R.I., Sorotsky V.A., Ulanov A.M. Methods for reducing distortions of the output voltage spectrum of switch-mode generators. Radiotekhnika. 2024. V. 88. № 3. P. 32−41. DOI: https://doi.org/10.18127/j00338486-202403-04 (In Russian)

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