Small‐signal‐based study of a two stage AC/DC and DC/DC battery charger using battery one time constant model

Abstract

This study focuses on considering battery one time constant model in the design of controllers of a two-stage AC/DC and DC/DC battery charger using the small-signal approach. For this aim, small-signal models of DC/DC and AC/DC converters and also the battery model are obtained. Moreover, the effect of disturbance terms are analysed to be omitted in controller loops. Simulation and experimental results of a 1 kW laboratory prototype show appropriate performance of designed controllers in tracking reference signals. Also, tuned controllers using this approach have guaranteed unity power factor and low total harmonic distortion. Furthermore, a complete charge cycle of a lithium-ion battery evaluates the performance of the converter in different constant current/voltage controlling modes. In comparison with restive model consideration, results show a more accurate model with grater damping ration and better stability characteristics.

A fast charging of Li‐ion battery based on Lyapunov function for electrical vehicle

“…To achieve high power density, efficiency and reliability, fullbridge DC-DC converter is chosen [18][19][20][21][22]. Typically, most of the EV control schemes which are implemented in fast charge stations are based on converter topology without considering battery chemical structure [23].…”

“…Typically, the topology of fast charging stations with high frequency transformer consists of an Active Front End (AFE) rectifier with power factor correction capability coupled with an isolated DC‐DC converter. To achieve high power density, efficiency and reliability, full‐bridge DC‐DC converter is chosen [18–22].…”