Modelling, control and realisation of the single-ended forward converter with resonant reset at the secondary side

• Published in: IET power electronics Vol. 8; no. 11; pp. 2097 - 2106
• Main Authors: Waltrich, Gierri, Barbi, Ivo
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 01.11.2015
• Subjects: Converters; Electric potential; Inductance; magnetising inductance; Modelling; power 600 W; resonant capacitor; resonant power convertors; resonant reset; single‐ended forward converter realisation; step‐down converter; step‐up converter; Switches; transformer reset; Transformers; Voltage; voltage stress; step-up converter; transformers; resonant capacitor; resonant power convertors; magnetising inductance; single-ended forward converter realisation; transformer reset; resonant reset; voltage stress; power 600 W; step-down converter
• ISSN: 1755-4535; 1755-4543; 1755-4543
• DOI: 10.1049/iet-pel.2014.0956

This study presents modelling, control and realisation of a forward converter with resonant reset at the secondary side. The transformer reset occurs through the resonance between its magnetising inductance and the resonant capacitor during the switch off time. The mechanism is similar to a forward converter with resonant reset at the primary side. The only difference is that the transformer-stored energy can now be partially delivered to the load instead of being dissipated in the switch at turn-on. Another advantage compared with conventional forward converters is the lower switch voltage stress and transformer size, which are theoretically proved to be lower. Furthermore, this converter can be used as a step-up and step-down converter. To verify all the mentioned features, simulations were carried out and a 600 W prototype was implemented experimentally, reaching a maximum efficiency of 94.3%.