INFLUENCE OF EQUIVALENT SERIES RESISTANCE OF OUTPUT CAPACITORS ON THE TRANSFER
FUNCTION OF FLYBACK CONVERTER 

Dmitry V. Yakushov, Leading circuit engineer, design bureau, Industrial and Commercial Company "Polyot" (6 Industrialny passage, Zarechny, Penza region, Russia); postgraduate student, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: hammer.fate@yandex.ru
Ekaterina A. Pecherskaya, Doctor of technical sciences, professor, head of the sub-department of information and measuring equipment and metrology, Penza State University (40 Krasnaya street, Penza, Russia), E-mail: iit@pnzgu.ru 

Background. The object of study is a flyback converter. The subject of the study is the influence of the equivalent series resistance (ESR) of capacitors on the transfer characteristic of the conversion stage. The goal is to identify the need to take into account the ESR of capacitors at the stage of development of a flyback converter. Materials and methods. To determine the influence of the ESR of capacitors on the transfer characteristic of the conversion stage, the small-signal model of Christophe P. Basso is used. Results. As a result, a strong influence of the ESR of capacitors was revealed at frequencies above the zero of the transfer function formed by the ESR of capacitors, especially in the region of subharmonic oscillations. Conclusions. It has been established that at the design stage of a power supply it is extremely important to take into account the ESR of capacitors and ensure stable operation of the power supply at any possible value. 

conversion, capacitors, power supply, stability, characteristic, frequency 

Yakushov D.V., Pecherskaya E.A. Influence of equivalent series resistance of output capacitors on the transfer function of flyback converter. Izmerenie. Monitoring. Upravlenie. Kontrol' = Measuring. Monitoring. Management. Control. 2024;(2):61–66. (In Russ.). doi: 10.21685/2307-5538-2024-2-7