A Modular Designed Three-phase ~98%-Efficiency 5kW/L On-board Fast Charger for Electric Vehicles Using Paralleled E-mode GaN HEMTs University of Michigan-Dearborn

Format:

Conference/Event

Author/Creator:

Bai, Bai, author.

Contributor:

Brown, Alan

Lu, Juncheng

McAmmond, Matt

Conference Name:

WCX 17: SAE World Congress Experience (2017-04-04 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2017

Summary:

AbstractMost of the present electric vehicle (EV) on-board chargers utilize a conventional design, id est, a boost-type Power Factor Correction (PFC) controller followed by an isolated DC/DC converter. Such design usually yields a ~94% wall-to-battery efficiency and 2~3kW/L power density at most, which makes a high-power charger, e.g., 20kW module difficult to fit in the vehicle. As described in this paper, first, an E-mode GaN HEMT based 7.2kW single-phase charger was built. Connecting three such modules to the three-phase grid allows a three-phase >20kW charger to be built, which compared to the conventional three-phase charger, saves the bulky DC-bus capacitor by using the indirect matrix converter topology. To push the efficiency and power density to the limit, comprehensive optimization is processed to optimize the single-phase module through incorporating the GaN HEMT switching performance and securing its zero-voltage switching. Close-loop control is implemented to minimize the output current ripple and balance the power among three single-phase modules. Simulation and experimental results validated that the proposed charger has an efficiency of ~98%, and a power density of ~5kW/L@20kW

Notes:

Vendor supplied data

Publisher Number:

2017-01-1697

Access Restriction:

Restricted for use by site license