DAB LCC Resonant Converter Triple Phase Shift Control Bi-directional Wireless Power Transfer

This paper presents the triple phase shift control method of the dual active bridge (DAB) LCC resonant converter for bi-directional high-efficiency wireless power transfer (WPT) applications in full operation range. The battery current amplitude feedback control regulates the primary side H-bridge internal phase shift angle. The battery side equivalent AC impedance is controlled at optimal value by regulating the battery side H-bridge internal phase shift angle. The phase shift angle amplitude between the two H-bridges is set to 90°. The power flow direction change is realized by simultaneously swapping the two internal phase shift angles together with the PWM modulator output gating signals to ensure the power is transferred from the phase leading H-bridge to the phase lagging H-bridge. The proposed DAB LCC resonant converter bi-directional battery charging and discharging control method has been verified in the PLECS circuit simulation and DC/DC converter hardware test.