PLL control technique of LLC resonant converter for EVs battery charger

Abstract

In this paper, LLC resonant converter simulation with Phase Locked Loop (PLL) control technique is demonstrated for Electric Vehicles (EVs) battery charger. In order to have an efficient energy transfer among variable converter components, special control techniques of the converter must be considered to diminish switching losses. The presented LLC resonant converter is controlled under soft-switching conditions with respect to the different input voltages and load conditions. Furthermore, to decrease the battery charging time, constant current and constant voltage control methods are used. The design of the DC/DC resonant converter which outputs 60 V / 20 A with an input of 240 V is simulated delivering 1.2 kW. The simulation results show that PLL control technique makes the input current and the input voltage in phase under different output load and input voltage conditions.