Abstract
Electric mobility is nowadays one of the more important trends regarding pollution reduction and global warming due to fuel consumption. Big efforts are done in order to develop efficient and reliable power electronic systems for electric vehicles. In two stage on board-battery chargers, one way of improving efficiency is by means of ensuring the DC-DC isolated converter always operates in the nominal input/output voltage ratio, that could be achieved with a variable DC-link operation. In this paper, a four-switch buck-boost based AC/DC converter is deeply analyzed in order to improve its dynamic performance, the power factor and the total harmonic distortion. The converter suffers from a non-minimum phase characteristic in different input–output transfer functions, which reduces the closed-loop bandwidth of the system. Therefore, after a deep converter analysis has been done, different solutions have been evaluated and tested. Finally, a control to different output transfer functions of the converter become minimum phase, which allows us to increase the system bandwidth and, consequently, high power factor, low harmonics distortion, single control structure and fast dynamics for wide output voltage range are achieved.
Highlights
Transportation electrification had rapid growth beside the grid integration of efficient electric vehicle (EV), which is becoming exponentially essential
This paper focused on Level-2 on-board battery charging (OBC) where the input voltage maximum is 240 VAC
The minimum phase condition in (10) is satisfied for the boost mode, the converter can operate in buck mode, which needs to be validated
Summary
Transportation electrification had rapid growth beside the grid integration of efficient electric vehicle (EV), which is becoming exponentially essential. Many researchers have tried to minimize the electrolytic capacitors or eliminate them totally to increase the converter energy density aiming for low-cost solutions PFC in [10,11,12] It has a simple controller with the capability of universal input voltages from 85–240 V. Single-switch topologies with boost and buck functions, such as SEPIC, buck-boost and Cuk converters, can comply with the battery pack voltage requirement, but the main disadvantage of those single-switch converters is the components voltage and current stresses They are not preferable to be used in high power application where high efficiency and reliability are needed. The second section discusses the effect of introducing a small low power snubber circuit to make the transfer functions of duty cycle to input current and duty cycle to output voltage minimum phase. The feasibility of the proposal is validated by means of simulation in the last section
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
