Next Article in Journal
Comparative Study on Game-Theoretic Optimum Sizing and Economical Analysis of a Networked Microgrid
Next Article in Special Issue
High-Efficiency Bidirectional LLC Resonant Converter with Primary Auxiliary Windings
Previous Article in Journal
Research on Access Mode of the Flexible DC Power Distribution System into AC System
Previous Article in Special Issue
Modeling and Control of Double-Sided LCC Compensation Topology with Semi-Bridgeless Active Rectifier for Inductive Power Transfer System
Open AccessArticle

Voltage Balance Switching Scheme for Series-Connected SiC MOSFET LLC Resonant Converter

The Department of Electrical and Biomedical Engineering, Hanyang University, Seoul 04763, Korea
*
Author to whom correspondence should be addressed.
Energies 2019, 12(20), 4003; https://doi.org/10.3390/en12204003
Received: 30 September 2019 / Revised: 19 October 2019 / Accepted: 20 October 2019 / Published: 21 October 2019
(This article belongs to the Special Issue Advanced in Resonant Converter and Dual Active Bridge Converter)
To achieve high efficiency and power density, silicon carbide (SiC)-based Inductor-Inductor-Capacitor (LLC) resonant converters are applied to the DC/DC converter stage of a solid-state transformer (SST). However, because the input voltage of an SST is higher than the rated voltage of a commercial SiC device, it is essential to connect SiC devices in series. This structure is advantageous in terms of voltage rating, but a parasitic capacitance tolerance between series-connected SiC devices causes voltage imbalance. Such imbalance greatly reduces system stability as it causes overvoltage breakdown of SiC device. Therefore, this paper proposes a switching scheme to solve the voltage imbalance between SiC metal-oxide-semiconductor field-effect transistors (MOSFETs). The proposed scheme sequentially turns off series-connected SiC MOSFETs to compensate for the turn-off delays caused by parasitic capacitor tolerances. In addition, dead-time selection methods to achieve voltage balance and zero voltage switching simultaneously are provided in detail. To verify the effectiveness of the proposed scheme, experiments were conducted on a 2 kW series-connected SiC MOSFET LLC resonant converter prototype. View Full-Text
Keywords: series-connected SiC MOSFETs; voltage balancing; solid-state transformer; LLC resonant converter series-connected SiC MOSFETs; voltage balancing; solid-state transformer; LLC resonant converter
Show Figures

Figure 1

MDPI and ACS Style

Cha, H.-R.; Kim, R.-Y. Voltage Balance Switching Scheme for Series-Connected SiC MOSFET LLC Resonant Converter. Energies 2019, 12, 4003.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop