| Abstract |
The paper considers specific issues related to the design and realisation of observer-based feedback of
isolated output voltage for resonant power converters. To provide a focus to the study, a 3rd order
LCC converter is employed as a candidate topology. It is shown that whilst resonant converters
nominally operate at high switching frequencies to facilitate the use of small reactive components, by
appropriate pre-conditioning of non-isolated resonant-tank voltages and currents, the resulting
observer can be implemented at relatively low sampling frequencies, and hence, take advantage of
low-cost digital hardware.
Experimental results are used to demonstrate the accuracy of observer estimates under both transient
and steady-state operating conditions, and to show operation of the observer as part of a closed-loop
feedback system where the LCC resonant converter is used as a regulated power supply. |
