A Time-Domain Modeling of Multi-Element Resonant Converter With Capacitive Output Filter
LLC Resonant Converter , CLL Resonant Converter , Solar PV , DC-DC Converter , Renewable Energy
In this thesis, an analytical based design tool has been proposed for the multi-elements resonant converters. A computer program has been written using the generalized equations in MATLAB App Designer. The MATLAB App Designer provides a graphical user interface (GUI) features to this tool. The time-domain analysis of CLL resonant converter has been introduced in the literature. An alternative time-domain analysis of LLC resonant converter has been proposed.This generalized analysis is used to model LLC resonant, CLL resonant and LC series resonant converter in time-domain. State-plane analysis has been also introduced for both LLC and CLL resonant converters. The performance curves for DC power, voltage gain, peak switch current, RMS value of switch current, peak capacitor voltage and zero voltage switching (ZVS) angle are presented as a function of the frequency and the load. State-of-the-art design examples have been shown. This work also proposes a novel Push-Pull resonant converter. The CLL resonant tank has been find to be best fit for secondary side resonance with push-pull configuration. A steady-state analysis of Push-Pull CLL resonant converter has been done in time-domain. The CLL resonant tank has been designed to provide both series and parallel resonance characteristic based on proper selection of inductance ratio and quality factor. A computer program has been written using the generalized equations in MATLAB App Designer for study and optimization of CLL resonant tank. Experimentation has been done to verify the soft-switching features of Push-Pull resonant converter. A comparative analysis is shown between LLC and CLL resonant tanks using design curves. Experimentation has been done to verify the theoretical findings from this tool on the experimental prototype of 400V/320W for LLC and CLL resonant converters operating between input voltage 20V-40V.