NDLI: Three-stage SiC-based bi-directional on-board battery charger with titanium level efficiency

Content Provider	IET Digital Library
Author	Radimov, Nikolay Li, Guibin Tang, Mengting Wang, Xiaoyu
Abstract	This Letter proposes a novel control and optimisation strategy for a bi-directional, three-stage, on-board battery charger (OBC) achieving 80 PLUS Titanium efficiency. The proposed strategy utilises the benefits of silicon carbide (SiC) devices and is based on direct current hysteretic control (DCHC) with optimisation of switching patterns and dead time. The OBC first stage is a solid-state transformer that provides the isolation barrier and is operated under zero-current switching/zero-voltage switching (ZVS) conditions. The second stage is a bi-directional buck–boost converter that operates in critical conduction mode (CRM) with automatic dead time optimisation to achieve ZVS operation. The third stage is an H-bridge inverter with a DCHC controlled current loop to optimise dynamic and steady-state performance and provide a smooth transition between CRM and continuous conduction mode. The DCHC is implemented using a hybrid software/hardware approach. The experimental results show that the OBC can not only change the power flow direction within a few milliseconds but can also provide reactive power support for the grid. Additionally, the OBC achieves a peak efficiency of 96.65% and a minimum total harmonic distortion equal to 1%.
Starting Page	1477
Ending Page	1480
Page Count	4
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 7, May (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2019.1263
Journal	IET Power Electronics
Publisher Date	2020-01-20
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	80 PLUS Titanium Efficiency Automatic Dead Time Optimisation Battery Chargers Bi-directional Buck–boost Converter Continuous Conduction Mode Control of Electric Power System Critical Conduction Mode Current Control Current Loop DC-DC Power Converter DCHC Direct Current Hysteretic Control Electric Current Control Harmonic Distortion Invertors Isolation Barrier OBC Optimisation Strategy Peak Efficiency Power Electronics Power Flow Direction Power Supply SiC Silicon Carbide Device Solid-state Transformer Steady-state Performance Supervisory Circuit Switching Converter Three-stage Silicon Carbide-based Bidirectionalon-board Battery Charger Titanium Level Efficiency Zero Current Switching Zero Voltage Switching ZVS Operation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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