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access icon openaccess PLL controller for achieving zero-voltage switching (ZVS) in inductorless half-bridge drive piezoelectric transformer resonant power supplies

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 21/06/2018, Accepted 27/07/2018, Published 22/01/2019

Inductorless half-bridge, piezoelectric transformer (PT) resonant power supplies require careful control if zero-voltage switching (ZVS) of the MOSFETs is to be achieved. Here, the authors describe how a phase-locked loop (PLL) may be used to achieve this by ensuring adequate deadtime exists between the two MOSFETs to allow the PT input voltage to fully charge to the DC link. Experimental results demonstrate the operation of the system.

Inspec keywords: piezoelectric devices; phase locked loops; resonant power convertors; MOSFET circuits; switching convertors; transformers; zero voltage switching

Other keywords: ZVL; zero-voltage switching; phase-locked loop; DC link; PT input voltage; PLL controller; dead time; MOSFETs; inductor-less half-bridge drive piezoelectric transformer resonant power supplies

Subjects: Power electronics, supply and supervisory circuits; Modulators, demodulators, discriminators and mixers

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http://iet.metastore.ingenta.com/content/journals/10.1049/joe.2018.8063
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