Investigation of a Resonant dc–dc Converter for Light Rail Transportation Applications

Abstract

A high efficiency dc-dc converter is studied for light rail transportation applications on DC microgrid systems. The adopted structure includes two series-connected resonant circuits with single isolated transformer from input 750 V to output 48 V. Two half-bridge resonant circuits and one voltage balance capacitor are used to reduce voltage rating of active devices and to realize split voltages balance. Two series resonant circuits are connected with input-series by single transformer to reduce primary root-mean-square currents. Therefore, power devices with low voltage rating are selected in studied circuit to reduce power loss on sower devices and transformer winding of the isolated transformer. Frequency control approach is adopted to adjust load voltage under different voltage condition and current variations. Since the equivalent resonant tank of the studied circuit is activated under inductive load, active devices are easily operated at zero-voltage switching over wide voltage and current operation range. The feasibility of the studied circuit has been verified with a 1 kW prototype.

A Unified Multimode Control of a DC–DC Interlinking Converter Integrated into a Hybrid Microgrid

“…The configuration of the system operating in this mode is illustrated in Figure 7. The system of Equation (11) and equilibrium points (12) are obtained:…”

“…By applying the Laplace transform to Equation (11) and replacing the equilibrium terms (12), we obtain the transfer function (13):…”

“…Note how the transfer function 14is not dependent on the operation point of the converter. The system of Equation (11) and equilibrium points (12) are obtained:…”

“…Most of the existing DC-DC bidirectional topologies can accomplish the requirements for ILCs. Isolated topologies, such as dual-active-bridge (DAB) or resonant converters, are reliable and can provide high converter ratios and increased efficiency at the expense of higher complexity in both implementation and control [8][9][10][11][12][13]. Multiport converters constitute the most sophisticated approach of this kind of circuit.…”

Analysis and Design of a ZVT Resonant Boost Converter Using an Auxiliary Resonant Circuit

“…There has been an increase in the interest of using renewable energy sources to replace fossil fuels in order to resolve problems related to environmental destruction and to combat climate change and extreme weather trends that may be caused by environmental and air pollution that have resulted from recent rapid industrialization [1,2].…”