Open AccessSoft‐switching operation of the dual‐interleaved boost converter over all duty ratios
Author(s) -
Ahmed Md Rishad,
Todd Rebecca,
Forsyth Andrew John
Publication year - 2017
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.2016.0861
Subject(s) - snubber , inductor , transformer , duty cycle , capacitor , voltage , converters , electrical engineering , materials science , transistor , topology (electrical circuits) , electronic engineering , engineering
To extend the operating range of the snubber assisted zero‐voltage and zero‐current transition dual‐interleaved boost converter beyond its inherent soft‐switching limit of D = 0.5, a resonant pulse transformer is proposed instead of the resonant inductor. The 1 : 2 turns ratio of the transformer ensures full discharge of the snubber capacitor at all duty ratio values to facilitate zero‐voltage zero‐current switching at turn on of the main switching devices. The effectiveness of the topology has been confirmed by SPICE simulation and demonstrated by a 20 kW SiC metal–oxide–semiconductor field‐effect transistor converter. The prototype operated at 20 kW, 112 kHz, 320–600 V achieving 98.7% efficiency and achieved 98.2% efficiency at 6 kW. Taking the additional losses in the auxiliary circuit into account, the switching losses at 20 kW are reduced by 74% compared with hard‐switching operation, representing a 54% reduction in overall losses.