Time Domain Modelling of LLC Converter

This paper presents the time domain model of an LLC converter. Reducing switching losses at increased frequency has become one of the essential requirements for designing converters. There are several techniques that are used for controlling and designing the LLC converter. Fundamental harmonic analysis (FHA) is a frequency-domain analysis with a low accuracy. Other methods are time-domain analysis and state-plane methods that use the exact model of the converter to describe the accurate behavior of the system. The time-domain analysis (TDA) has a higher frequency than the FHA and provides optimized parameters and results. TDA is performed by dividing the time duration into different stages, and the proposed model discusses the four stages that are P, P
x
, O
x
, and N
x
. The proposed mathematical model is implemented and analyzed through MATLAB using different conditions to understand the working modes of the converter. The system efficiency was observed to be up to 97% and the model was stable and effective.