Dead-time optimization for SiC based voltage source converters using online condition monitoring

doi:https://doi.org/10.1109/WiPDA.2017.8170495

Title: Dead-time optimization for SiC based voltage source converters using online condition monitoring

Full Record
Other Related Research

Abstract

This paper introduces a dead-time optimization technique for a 2-level voltage source converter (VSC) using turn-off transition monitoring. Dead-time in a VSC impacts power quality, reliability, and efficiency. Silicon carbide (SiC) based VSCs are more sensitive to dead-time from increased reverse conduction losses and turn-off time variability with operating conditions and load characteristics. An online condition monitoring system for SiC devices has been developed using gate drive assist circuits and a micro-controller. It can be leveraged to monitor turn-off time and indicate the optimal dead-time in each switching cycle of any converter operation. It can also be used to specify load current polarity, which is needed for dead-time optimization in an inverter. This is an important distinction from other inverter dead-time elimination/optimization schemes as current around the zero current crossing is hard to accurately detect. A 1kW half-bridge inverter was assembled to test the turn-off time monitoring and dead-time optimization scheme. Results show 91% reduction in reverse conduction power losses in the SiC devices compared to a set dead-time of 500ns switching at 50 kHz.

Authors:

Dyer, Jacob ^[1]; Zhang, Zheyu ^[1]; Wang, Fei ^[2]; Costinett, Daniel J. ^[2];

^[2]; Blalock, Benjamin J. ^[2]

The University of Tennessee, Knoxville
ORNL

Publication Date:: 2017-11-01

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1468923

DOE Contract Number:: AC05-00OR22725

Resource Type:: Conference

Resource Relation:: Conference: IEEE Workshop on Wide Bandgap Devices and Applications - Albuquerque, New Mexico, United States of America - 11/1/2017 4:00:00 AM-11/3/2017 4:00:00 AM

Country of Publication:: United States

Language:: English

Citation Formats


                    Dyer, Jacob, Zhang, Zheyu, Wang, Fei, Costinett, Daniel J., Tolbert, Leon M., and Blalock, Benjamin J. Dead-time optimization for SiC based voltage source converters using online condition monitoring.  United States: N. p., 2017. 
        Web.  doi:10.1109/WiPDA.2017.8170495.

Copy to clipboard


                    Dyer, Jacob, Zhang, Zheyu, Wang, Fei, Costinett, Daniel J., Tolbert, Leon M., & Blalock, Benjamin J. Dead-time optimization for SiC based voltage source converters using online condition monitoring.  United States.  https://doi.org/10.1109/WiPDA.2017.8170495

Copy to clipboard


                    Dyer, Jacob, Zhang, Zheyu, Wang, Fei, Costinett, Daniel J., Tolbert, Leon M., and Blalock, Benjamin J. Wed .  
        "Dead-time optimization for SiC based voltage source converters using online condition monitoring".  United States.  https://doi.org/10.1109/WiPDA.2017.8170495.  https://www.osti.gov/servlets/purl/1468923.

Copy to clipboard


                    
@article{osti_1468923,

  title        = {Dead-time optimization for SiC based voltage source converters using online condition monitoring},

  author       = {Dyer, Jacob and Zhang, Zheyu and Wang, Fei and Costinett, Daniel J. and Tolbert, Leon M. and Blalock, Benjamin J.},

  abstractNote = {This paper introduces a dead-time optimization technique for a 2-level voltage source converter (VSC) using turn-off transition monitoring. Dead-time in a VSC impacts power quality, reliability, and efficiency. Silicon carbide (SiC) based VSCs are more sensitive to dead-time from increased reverse conduction losses and turn-off time variability with operating conditions and load characteristics. An online condition monitoring system for SiC devices has been developed using gate drive assist circuits and a micro-controller. It can be leveraged to monitor turn-off time and indicate the optimal dead-time in each switching cycle of any converter operation. It can also be used to specify load current polarity, which is needed for dead-time optimization in an inverter. This is an important distinction from other inverter dead-time elimination/optimization schemes as current around the zero current crossing is hard to accurately detect. A 1kW half-bridge inverter was assembled to test the turn-off time monitoring and dead-time optimization scheme. Results show 91% reduction in reverse conduction power losses in the SiC devices compared to a set dead-time of 500ns switching at 50 kHz.},

  doi          = {10.1109/WiPDA.2017.8170495},

  url          = {https://www.osti.gov/biblio/1468923},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2017},

  month        = {11}

}

Copy to clipboard

Conference:

View Conference (0.85 MB)

https://doi.org/10.1109/WiPDA.2017.8170495

Other availability

Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Online condition monitoring based dead-time compensation for high frequency SiC voltage source inverter

Conference Dyer, Jacob ; Zhang, Zheyu ; Wang, Fei ; ...

Dead-time, device output capacitance, and other non-ideal characteristics cause voltage error for the midpoint PWM voltage of the semiconductor phase-leg employed in a voltage-source inverter (VSI). Voltage-second balancing is a well-known concept to mitigate this distortion and improve converter power quality. This paper proposes a unique voltage-second balancing scheme for a SiC based voltage source inverter using online condition monitoring of turn-off delay time and drain-source voltage rise/fall time. This data is sent to the micro-controller to be used in an algorithm to actively adjust the duty cycle of the input PWM gate signals to match the voltage-second of themore »« less
https://doi.org/10.1109/APEC.2018.8341269

Full Text Available
Model-Based Dead Time Optimization for Voltage-Source Converters Utilizing Silicon Carbide Semiconductors

Journal Article Zhang, Zheyu ; Lu, Haifeng ; Costinett, Daniel J. ; ... - IEEE Transactions on Power Electronics

Dead time significantly affects the reliability, power quality, and efficiency of voltage-source converters. For silicon carbide (SiC) devices, considering the high sensitivity of turn-off time to the operating conditions (> 5× difference between light load and full load) and characteristics of inductive loads (> 2× difference between motor load and inductor), as well as large additional energy loss induced by the freewheeling diode conduction during the superfluous dead time (~15% of the switching loss), then the traditional fixed dead time setting becomes inappropriate. This paper introduces an approach to adaptively regulate the dead time considering the current operating condition andmore »« less
Cited by 2
https://doi.org/10.1109/TPEL.2016.2645578

Full Text Available
Online Junction Temperature Monitoring Using Intelligent Gate Drive for SiC Power Devices

Journal Article Zhang, Zheyu ; Dyer, Jacob ; Wu, Xuanlyu ; ... - IEEE Transactions on Power Electronics

Junction temperature is a prime design/operation parameter, as well as, a main indicator of device's health condition for power electronics converters. Compared to its silicon (Si) counterparts, it is more critical for silicon carbide (SiC) devices due to the reliability concern determined by the immaturity of new material and packaging. This paper presents a practical implementation using an intelligent gate drive for online junction temperature monitoring of SiC devices based on turn-off delay time as the thermo-sensitive electrical parameter. First, the sensitivity of turn-off delay time on the junction temperature for fast switching SiC devices is analyzed. A gate impedancemore »« less
https://doi.org/10.1109/TPEL.2018.2879511

Full Text Available
A Control Scheme to Mitigate the Dead-Time Effects in a Wireless Power Transfer System

Conference Kavimandan, Utkarsh ; Galigekere, Veda Prakash ; Onar, Omer ; ...

In practice, a dead-time is always provided between the complementary switching instances of the inverter phase-leg devices. At higher operating frequencies, the dead-time issues in wireless power transfer (WPT) systems become critical, especially as the power level increases. In certain operating conditions, the dead-time effect in wireless power transfer system affects the switching characteristics. Consequently, the switching losses in the power semiconductor devices increase and also impact the efficiency of the overall system. In this paper, a simple control scheme is proposed to eliminate the dead-time effect (or voltage polarity reversal) in the WPT inverter. The proposed control scheme monitorsmore »« less
Full Text Available
Soft Switching Over the Entire Line Cycle for a Quadruple Active Bridge DCX in a DC to Three-Phase AC Module

Conference Majmunovic, Branko ; Mukherjee, Satyaki ; Mallik, Rahul ; ...

This paper is focused on a transformer-isolated quadruple active bridge (QAB) dc-dc converter loaded by three full-bridge dc-ac inverters. The QAB functions as a "DC trans-former" (DCX) in the dc-to-three-phase ac module. The QAB outputs provide time-varying power at twice the line frequency, which presents challenges in maintaining zero voltage switching (ZVS) on the secondary sides during low-power portions of the line cycle. It is shown how ZVS can be achieved in a phase, even at zero-power transfer, using a relatively small circulating current provided by the magnetizing inductance of the high-frequency transformer. The approach is particularly effective in high-voltagemore »« less
https://doi.org/10.1109/APEC39645.2020.9124424

Similar Records