Small Signal Analysis and Variable Frequency Control of Non-isolated Current-fed Half-Bridge Parallel LC Resonant-Impulse ZCS Voltage Doubler for Fuel Cell Vehicles

This paper presents detailed small signal modelling and closed loop control of non-isolated impulse commutated series LC resonance based half-bridge current-fed dc/dc converter achieving zero current switching (ZCS) of the semiconductor devices for high-voltage gain applications. State-space averaging technique is introduced to derive the transfer functions and implement a controller design of current fed non-isolated voltage doubler with series LC resonant adopting operated through the frequency modulation. Two-loop average current control is designed and implemented to evaluate and demonstrate the transient performance of the converter. Complete design procedure is presented. Simulation results with the designed controller are manifested to validate the stability of the designed control system using PSIM software 11.