Effect of inductor parasitic resistances on the voltage gain of high step‐up DC–DC converters for electric vehicle applications

Abstract

Reconfiguration, sizing and downsizing of the storage unit, in electrically propelled vehicles, are techniques that have been reported effective to improve the shelf life and performance of the storage cells. However, these solutions might decrease the rated voltage of the storage unit and therefore DC-DC converters with high voltage gain are suitable solutions to connect these low-voltage units to the motor drive, keeping a good performance of the vehicle. Moreover, parasitic resistances presented in the components of these converters have proved to influence the efficiency and the voltage gain of the converter. The ideal voltage gain of four high step-up converters is analysed, derived, and compared. These converters were selected because of their potential to be applied in electric mobility and their similarity in the techniques that use to achieve high voltage gain: interleaving phases and magnetic integration. One of the analysed topologies is proposed by the authors. Afterwards, the parasitic resistance effect is analysed to obtain the non-ideal voltage gain and the efficiency of these four topologies. Finally, the topology that presents the best trade-off between the non-ideal voltage gain and the efficiency is experimentally tested with a 100 W prototype IET Power Electron.

Practical Considerations for Designing Reliable DC/DC Converters, Applied to a BIPV Case

“…In [85] an Interleaved Boost with Integrated Winding Coupled Inductor (IBIWCI) is presented and the effect of the parasitic resistance on the voltage gain is compared to other coupled inductor boost topologies. It was found that the voltage gain of the IBIWCI suffers the least from this effect.…”

Finite Element Methods for Multi-objective optimization of a High Step-up Interleaved Boost Converter

“…6 considers different cases of ratios between the parasitic resistances RL and the load Ro and proves the importance of parasitic components in HSU converters. It is possible to conclude that when the ratio between the parasitic resistances in the windings and the resistance of the load increases, the voltage gain is increasingly affected [20].…”

“…As a result of this topology optimization procedure, the core EE50 PC40 was selected for the case study described above. This core is much smaller than the one that was originally selected and that have been tested in previous studies [20] [22].…”

“…This study analyses an HSU converter with a novel coupled-inductor capable of increasing the power density and the voltage gain. This converter acquires an outstanding performance thanks to the combination of the techniques of magnetic coupling and interleaving phases, which are effective for downsizing inductive and capacitive components in DC-DC converters [20]- [22]. Also, from the physics point of view, a reduction in the magnetic core size could represent a direct reduction on the iron losses [23].…”

Conversor CC-CC de Alto Ganho Boost-Quadrático-Duplo-Flyback

“…Conversores elevadores também possuem grande inserção em veículos elétricos fazendo parte do interfaceamento entre as fontes armazenadoras de energia (isto é, baterias, ultracapacitores e células combustível) e os motores elétricos [3], [4]. Também fazem parte dos sistemas das nanoredes e das microredes em corrente contínua (CC) [5], [6].…”