Design and Controlled for Bridgeless Zeta-Luo Converter for EV Charging

Abstract: Thewidespreadadoptionofelectricvehicles(EVs)hasnecessitatedthedevelopmentofefficientand reliable charging infrastructure. Conventional EV chargers often employ bridge rectifiers, which can lead to significant conduction losses due to the presence of high-voltage diodes. To address this limitation, a novel EV charger based on a bridgeless (BL) isolated Zeta-Luo converter with built-in power factor (PF) preregulation capability at the supply side has been proposed. The BL isolated ZetaLuo converter is a combination ofa Zeta converter and aLuo converter, each operating during alternatehalves of the supply voltage cycle. This approach eliminates the need for bridge rectifiers, reducing conduction losses and improving overall efficiency. Additionally, the shared output inductors of the Zeta and Luo converters furthercontributeto the compact sizeand lightweight design ofthecharger.Thebuilt-in PFPreregulation capability ensures that the charger operates with a near-unity power factor, minimizing reactive power consumption and improving grid stability. This is achieved by regulating the input current waveform to closely match the input voltage waveform. The proposed EV charger offers several advantages over conventional chargers, including: The BL topology and shared output inductors significantly reduce semiconductor losses, leading to improved efficiency. The built-in PF Preregulation capability ensures near-unity power factor operation, minimizing reactive power consumption and improving grid stability. The elimination of bridge rectifiers and the sharing of output inductors result in a compact and lightweight charger design. Enhanced performance under sudden voltage variations: The proposed charger exhibits robust performance under sudden line voltage fluctuations, ensuring reliable EV charging even during unstable grid conditions. The Bridgeless Isolated Zeta–Luo Converter-Based EV Charger With PF Preregulation presents a promising solutionforefficientandreliableEVcharging.Itscombinationofhighefficiency,improvedpowerfactor, reduced size, and enhanced performance under voltage variations makes it an attractive choice for future EV charging infrastructure.