On Board Dual Active Bridge Converter for Electric Scooter

Abstract

After the recent increase in the popularity of electric scooters, which are small, earth friendly and more ef- is on the increase. cient onboard chargers. Despite being big in size, powerful chargers are big in size. do not have the efciency to power small cars such as scooters, onboard. chargers should be tiny, powerful, low cost, and dependable. This thesis proposes a design and model of a small onboard charger. on a Dual Active Bridge (DAB) converter. The proposed system uses a high-frequency (HF) isolated DC-DC converter, ftting power and galvanic isolation simultaneously and enabling power transfer between them easily. between the battery storage system and the source. For unidirectional oper- This modulation scheme is called Single Phase Shift (SPS) modulation scheme and used so as to simplify. the control strategy, reduce switching losses and reduce computational. overhead, which renders it suitable to deploy with a low-priced embedded. controller. The impact of non-ideal terms, such as leak- is also considered in the study. inductive coupling with age, switching losses and power-delivery parasitance. and voltage regulation. It is the MAT- system that is modelled and simulated. LAB/Simulink to check its performance in a variety of load and input. voltage conditions. In addition, a realistic prototype is created, feato make a full-bridge circuit of MOSFETs a high-frequency trans- former, and an Arduino-based controller to produce PWM (Pulse Width). Modulation) signals. The special emphasis is made on optimization of the trans- old design and switching approach to reduce the output voltage ripple. It is proposed to work, both in simulation and experimental results. system steadily DC output, efciency in power transfer and minimized. size, it can be used extensively in the applications of electric scooters. The design created can provide a viable approach to overcome the constraints of current charging systems.