Dual Input Common LLC-Resonant Tank based off-Grid Charger

Abstract

The paper proposes novel topology “dual input common LLC-resonant tank-based charger for charging the 72V, 60Ah Lithium-ion battery. With four active switches, the topology is a twin half-bridge LLC circuit. This design eliminates the need for additional circuit components by allowing the two sources to share the same resonant tank for transferring energy to the load. The converter is operating in differential mode. Current controlled Variable frequency control using simple PI controller is employed to regulate battery charging at different line and load perturbations. A simulation study is done on 3.3kW proposed charger using MATLAB/SIMULINK to support the theoretical concept.