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

Abstract

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.

Keywords

• conversion
• capacitors
• power supply
• stability
• characteristic
• frequency