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access icon free Magnetising-current-assisted wide ZVS range push–pull DC/DC converter with reduced circulating energy

© The Institution of Engineering and Technology
Received 19/12/2016, Accepted 13/09/2017, Revised 15/08/2017, Published 14/09/2017

An improved high efficiency wide zero-voltage-switching (ZVS) range push–pull converter for low-voltage to high-voltage power conversion is proposed in this study. For this improved converter, all of primary switches are turned on with ZVS operation from full load to light load by using the energy stored in the leakage inductance aided by the magnetising inductance. The resonance between the leakage inductor and the voltage-doubler-rectifier capacitors reduces not only the voltage and current stresses of rectifier diodes but also the turns ratio of high-frequency transformer and conduction loss. In addition, the circulating energy is decreased dramatically compared with the similar converter resulting in lower conduction loss. This topology features simpler structure and higher efficiency. Detailed operational principle, design, comparative study and experimental results are fully discussed in the text. Finally, a 200 W experimental prototype has been built to verify the effectiveness of the proposed concept.

Inspec keywords: power transformers; power semiconductor diodes; power capacitors; DC-DC power convertors; power semiconductor switches; rectifiers; zero voltage switching

Other keywords: leakage inductor; leakage inductance; power 200 W; magnetising-current-assisted wide ZVS range push-pull DC-DC converter; conduction loss; low-voltage-to-high-voltage power conversion; high efficiency wide zero-voltage-switching range push-pull converter; turns ratio; voltage-doubler-rectifier capacitors; magnetising inductance; reduced circulating energy; rectifier diodes; high-frequency transformer; primary switches; current stress; voltage stress; ZVS operation

Subjects: DC-DC power convertors; Power electronics, supply and supervisory circuits; AC-DC power convertors (rectifiers); Junction and barrier diodes; Transformers and reactors; Power semiconductor devices; Relays and switches

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