Pulsewidth Locked Loop (PWLL) for Automatic Resonant Frequency Tracking in LLC DC–DC Transformer (LLC -DCX)
- 13 August 2012
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Power Electronics
- Vol. 28 (4), 1862-1869
- https://doi.org/10.1109/tpel.2012.2210912
Abstract
In recently developed distributed power architecture, the LLC resonant converter has been widely used as a dc–dc transformer (DCX) to provide a semiregulated or unregulated bus voltage. In order to achieve the highest efficiency, this paper proposes a novel switching frequency control scheme for the LLC-DCX. First, the synchronous rectifier (SR) gate-driving signals are tuned by eliminating the body diode conduction. Then, the pulsewidth locked loop (PWLL) is presented, by minimizing the pulsewidth difference between the main switch and the well-tuned SR gate-driving signals, the LLC-DCX always runs at the $f_0$ point to achieve the highest efficiency. For rapid prototyping purposes, the PWLL used to track $f_{0}$ is realized in a Cyclone III field programmable gate array.
Keywords
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