Resonant Tank Comparison of LC, LCC, and LCLC with Paralleled Inverter for Possible Surface Treatment Applications

This paper presents a resonant tank (RT) comparison of LC, LCC, and LCLC with paralleled inverter to generate plasma sources for possible material surface treatment. The compared multi-inverter system consists of three inverters with their outputs connected to the same load. Based on the aspects of sensitivity analysis, gain plots, simulation results and THD, the configurations of 2
^nd
, 3
^rd
, and 4
^th
-order RTs are discussed. The inverters with these three types of Resonant tanks with the unified phase shift and phase-difference controls are adopted to achieve identical output currents. Simulated results of two-module inverter system have demonstrated the analyses and discussions. Hardware measurements from two-modular parallel connected inverter systems with LCLC- D' RT have been also presented and to further verify the theoretical analyses simulation results of three inverter connected in parallel with ± 5-10% parameter difference has been also presented in this paper.