AIN SHAMS ENGINEERING JOURNAL, cilt.15, sa.3, ss.1-9, 2024 (SCI-Expanded)
In this paper, a multi-functional quasi-single stage, bi-directional
electric vehicle charger topology is proposed to realize high efficiency
power conversion in all AC/DC, DC/DC, and DC/AC forms. The proposed
circuitry includes a noninverting buck boost converter (NBB) and an
H-bridge inverter. The NBB converter generates the desired output
voltage waveform in the rectified form then the inverter unfolds the
waveform to the AC waveform. The advantages of this circuit are the
reduced losses due to the high frequency switching only occurring at the
NBB converter and passive element sizes are smaller leading to reduced
losses and cost. The proposed charger is designed for 2 kVA rating and
simulated for all vehicle, grid, and another vehicle interaction modes.
Then the circuit is experimentally tested and is validated that the
proposed circuit can operate in all three modes at a wide range of
loading and power factor conditions with over 92% efficiency.