PROJECT TITLE :

Adaptive Voltage-Controlled Oscillator for Improved Dynamic Performance in LLC Resonant Converter

ABSTRACT:

This paper proposes an adaptive voltage-controlled oscillator (VCO) to improve the dynamic performance in LLC resonant converters. The proposed adaptive VCO is meant to have frequency-dependent little-signal gains, thus that the variation of low-frequency magnitude in frequency response of LLC resonant converter is effectively adjusted. Thus, an enhanced dynamic performance is obtained over wide-operating ranges. Through approximated derivation, the proposed adaptive VCO encompasses a straightforward formula and will not need any further sensing circuits. Furthermore, it's strong to variation of circuit parameters. Dynamic performance enhancement was verified by experimental results with a 14four-W laboratory prototype 0.5-bridge LLC resonant converter.