Open AccessImplementation and analysis of ultracapacitor charger in hybrid energy‐storage system for electric‐vehicle applications
Author(s) -
Tseng KuoChing,
Chang YuCheng,
Cheng ChunAn
Publication year - 2020
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2019.1469
Subject(s) - rectification , supercapacitor , electrical engineering , voltage , energy storage , electric vehicle , automotive engineering , engineering , power (physics) , chemistry , capacitance , physics , electrode , quantum mechanics
The light rail vehicles (commonly known as tramways or lightly laid railways) offer environmental advantages and have evoked an impressive attraction. The hybrid energy‐storage systems efficiently supply energy for the light rail vehicles during the travel. This study implements and analyses an ultracapacitor charger in hybrid energy‐storage system for electric‐vehicle applications. Moreover, an ultracapacitor charger based on a full‐bridge DC–DC converter that utilises a synchronous‐rectification technique and high charging‐current capability is presented. The proposed converter's current‐doubler synchronous rectification reduces the secondary circulating current and recycles the energy of the leakage current to the power‐source lead to further increase conversion efficiency. A prototype of this ultracapacitor charger, with an input voltage of 380 V and an output voltage of 14.6 V, has been implemented; the measured efficiency is 92.1% at a full load of 1 kW. In addition, the experimental results show the highest efficiency is 93.4% at an output power of 600 W. Furthermore, an ultracapacitor of 250 F is charged by the presented converter with a charging current of 65 A, and experimental waveforms illustrate that the charging time of the ultracapacitor voltage from 0 to 14.6 V is within 1 min.