A Modified Hy-DPSM for Magnetizing Inductance Inspired Modified DAB for Wide Category of EV Charger Design With Flat Efficiency Profile

Major design challenge for portable charger design, is a wide electric vehicle (EV) battery voltage compatibility. Additionally, wide variation in power transfer deteriorates dc–dc conversion efficiency. To immune system for wide range of power transfer and voltage, some modifications are proposed in this work. These modifications are inspired by zero voltage switching (ZVS) aesthetically feature. This is done by considering both transfer and magnetizing inductance (
L_t
and
L_m
) into a DAB. Additionally, some modifications in conventional dual phase shift modulation (DPSM) are proposed. It is based on hybrid conduction angle control in DPSM. This is on account to achieve ZVS for all field effect transistors (FETs). These proposed modifications in both circuit and control, alter secondary side quantities, which extends ZVS region. This underlying concept emphasizes on optimizing peak current stress using Lagrange's multiplier approach. A 2.5 kW single phase system with 72–320 V EV battery voltage is considered to validate concept. Furthermore, to make active front end converter performance unaltered with grid voltage uncertainties, phase compensated fixed frequency tuned second order generalized integrator is used to estimate grid angle. A set of selective harmonic oscillators are used to limit grid current total harmonic distortion.