Integrated DC/DC Converter Topology Study for Fuel Cell Hybrid Vehicles with Two Energy Sources

Abstract

Conventional hybrid vehicles with two energy sources require two separate on-board DC/DC converters to connect the battery and the fuel cell, which have the disadvantages of large size, high cost, high losses and few applicable operating conditions. To address this situation, this paper proposes an optimized on-board integrated DC/DC converter with a non-isolated multi-port scheme that integrates a unidirectional port for the fuel cell and a bidirectional port for the battery and load. This can achieve a combined energy supply and recovery with a single integrated converter, effectively overcoming the above disadvantages. The optimized converter topology is relatively simple, and the magnetic losses of the transformer are removed. Furthermore, the switched capacitor is introduced as a voltage doubling unit to achieve high-gain output, so the fuel cell and battery voltage demand levels are reduced under the same load conditions. In addition, it has superior performance in system energy management for hybrid vehicles, which can distribute power and switch operating states by controlling the on/off of switching devices to make it suitable for five driving conditions. This paper discusses in detail the operating principles of the converter and analyzes its steady-state performance under five operating modes, derives its dynamic model, and proposes a proportional-integral control scheme. Finally, the simulation model of the topology is built by Matlab/Simulink software to verify the converter operation in each driving state, and the simulation experimental results verify the applicability of the proposed integrated DC/DC converter topology.

A Critical Comparison of the Cuk and the Sheppard–Taylor Converter

“…If it is assumed that the diodes, the MOSFETs, and the inductors present the same resistance, the Equation ( 30) is obtained. On the other hand, the Equation (31) shows the conduction losses in the Cuk converter. In all the elements of the sum, except the one that represents the losses due to the current i 2 when the MOSFETs are off, the Sheppard-Taylor equation presents more elements.…”

A Comprehensive Review of Electric Vehicle Charging Stations with Solar Photovoltaic System Considering Market, Technical Requirements, Network Implications, and Future Challenges

“…The optimization of the photovoltaic charging system utilizing the soft computing approaches has a number of difficulties, despite the fact that these methods are successful in themselves. For instance, the fuzzy logic controller is simply appropriate for use in a system that has a limited number of charging outlets and electric vehicles that need to be charged [138]. The rule table will get more complex as well as the algorithm will take longer time to execute if there are a large number of energy sources and EVs.…”

Performance analysis of ZVS and ZCS boost converters for Solar Photo Voltaic Applications

“…For high performance, full-bridge phase shift transformers (PSFB) are widely utilized in medium-strength applications. Due to its straightforward design, switches operate with gentle switching without the need for additional components [9][10][11][12]. Even so, the full-scale input conversion unit with the phase-shift control mechanism is inappropriate for use with fluctuating input voltage due to some significant flaws in its monitoring system, including a small number of ZVS sets of lagging leg switches, a failure of the duty cycle, a significant failure of the current, and voltage variations around the output diode.…”