A New Off-Board Electrical Vehicle Battery Charger: Topology, Analysis and Design

The extensive use of electric vehicles (EVs) can reduce concerns about climate change and fossil fuel shortages. One of the main obstacles to accepting EVs is the limitation of charging stations, which consists of high-charge batteries and high-energy charging infrastructure. A new transformer-less topology for boost dc-dc converters with higher power density and lower switch stress is proposed in this paper, which may be a suitable candidate for high-power fast-charging battery chargers of EVs. Throughout this paper, two operating modes of the proposed converter, continuous current mode (CCM) and discontinuous current mode (DCM), are analyzed in detail. Additionally, critical inductances and design considerations for the proposed converter are calculated. Finally, real-time verifications based on hardware-in-loop (HiL) simulation are carried out to assess the correctness of the proposed theoretical concepts

A New Transformer-Less Structure for a Boost DC-DC Converter with Suitable Voltage Stress

In this paper, a new structure is proposed for a boost dc–dc converter based on the voltage-lift (VL) technique. The main advantages of the proposed converter are its lack of transformer, simple structure, free and low input current ripple, high voltage gain capability by using an input source, suitable voltage stress on semiconductors and lower output capacitance. Herein, the analysis of the proposed converter operating and its elements voltage and current relations in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are presented, and the voltage gain of each operating mode is individually calculated. Additionally, the critical inductance, current stress of switches, calculation of passive components’ values and efficiency are analyzed. In addition, the proposed converter is compared with other studied boost converters in terms of ideal voltage gain in the CCM and the number of active and passive components, maximum voltage stress on semiconductors, and situation of input current ripples. The correctness of the theoretical concepts is examined from the experimental results using the laboratory prototype

A New Transformer-Less Structure for a Boost DC-DC Converter with Suitable Voltage Stress

In this paper, a new structure is proposed for a boost dc–dc converter based on the voltage-lift (VL) technique. The main advantages of the proposed converter are its lack of transformer, simple structure, free and low input current ripple, high voltage gain capability by using an input source, suitable voltage stress on semiconductors and lower output capacitance. Herein, the analysis of the proposed converter operating and its elements voltage and current relations in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) are presented, and the voltage gain of each operating mode is individually calculated. Additionally, the critical inductance, current stress of switches, calculation of passive components’ values and efficiency are analyzed. In addition, the proposed converter is compared with other studied boost converters in terms of ideal voltage gain in the CCM and the number of active and passive components, maximum voltage stress on semiconductors, and situation of input current ripples. The correctness of the theoretical concepts is examined from the experimental results using the laboratory prototype

Implementation and Efficiency Calculation of Fuel-Cell Vehicles Using a Bidirectional DC/DC Converter with ZVS

Fuel-cell (FC) vehicles are attracting much interest due to their advantages. In FC-powered vehicles, the application of DC/DC converters is for interfacing between the FC and the DC bus. Due to some of the inherent characteristics of FCs, such as large variations in the output voltage, efficiency improvement for different operation points is vital for optimal performance. Moreover, the bidirectional operation can be useful, for example, to charge supercapacitors in electric vehicles (EVs). In this article, the role of a DC/DC converter is as part of the interface system, and efficiency analysis is performed for an EV application. The design and application of the DC/DC converter are optimised based on the EV application\u27s use case scenario. First, the converter\u27s efficiency is analysed for a range of switching frequencies, input voltages, and duty cycles, with basic operations considered later. All the required relations and operating conditions are explained, and simulation results confirm the theoretical analysis