| Title |
Small-Signal Model of a AC/DC Converter in Single-Phase Hybrid Transformer using Generalized Average Modeling Method |
| Authors |
Gwon-Gyo Jung ; Ho-Sung Kim ; Jee-Hoon Jung |
| DOI |
https://doi.org/10.6113/TKPE.2024.29.3.192 |
| Keywords |
AC/DC converter; GAM(Generalized Average Modeling); Small-signal modeling; Hybrid transformer |
| Abstract |
This paper proposes a small-signal modeling approach for an AC/DC converter in single-phase hybrid transformer with an AC input. In contrast to a topology such as a boost PFC which uses a rectification stage, the AC/DC converter cannot be accurately modeled using classical small-signal techniques. In addition, single-phase topologies require alternative modeling methods because of the zero average current of the input inductor and input voltage, which is different from a three-phase case using a dq transformation. In this paper, a Generalized Average Modeling(GAM) technique is employed to obtain an accurate small-signal model for the totem-pole PFC circuit. This technique allows for the separation of real and imaginary components of voltage and current, even when the average input values are zero, enabling an effective small-signal modeling. The accurate model facilitates a more precise analysis of the dynamic characteristics of the AC/DC converter circuit than conventional approaches. Furthermore, it lays a groundwork for designing suitable current and voltage controllers. The accuracy of the proposed modeling technique is validated by circuit simulations and experiments with a 300 W prototype converter. |