Open AccessSensorless parameter estimation and current‐sharing strategy in two‐phase and multiphase IPOP DAB DC–DC converters
Author(s) -
Wang Yubin,
Wang Fan,
Lin Yifei,
Hao Tianqu
Publication year - 2018
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.2017.0860
Subject(s) - converters , phase (matter) , three phase , current (fluid) , control theory (sociology) , computer science , electrical engineering , physics , engineering , voltage , control (management) , artificial intelligence , quantum mechanics
A sensorless current‐sharing strategy for two‐phase and multiphase input‐parallel output‐parallel (IPOP) DC–DC converters is proposed here. A dual‐active‐bridge (DAB) DC–DC converter is chosen as the basic DC–DC converter. With this strategy in two‐phase IPOP DAB DC–DC converters, the parameter mismatches between phases are estimated by perturbing the duty cycle in one phase and measuring the changes of duty cycles in both phases, then the duty cycles are adjusted to compensate the mismatches, thus achieving current sharing without current sensor. With this strategy in multiphase IPOP DAB DC–DC converters, by perturbing the duty cycles in ( N − 1) out of N phases in turn and measuring the changes of duty cycles, respectively, the parameter mismatches among phases are estimated. According to the mismatches, a set of variables, which are proportional to the per‐phase output currents, are calculated. Then with a current‐sharing regulator, parameter mismatches are compensated, thus achieving current sharing without current sensor. The validity and feasibility of the proposed sensorless current‐sharing strategy are verified through both simulation and prototype experimental results.