TY - GEN
T1 - Dynamic Level Selection for Full Range ZVS in Flying Capacitor Multi-Level Converters
AU - Blackwell, Margaret E.
AU - Stillwell, Andrew
AU - Pilawa-Podgurski, Robert C.N.
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/9/10
Y1 - 2018/9/10
N2 - This paper presents a control technique for flying capacitor multi-level (FCML) converters to achieve zero-voltage switching (ZVS) across the full range of duty cycles, with application in high power density and high efficiency power converters. Previous works have used variable frequency control to enable ZVS at specific duty cycles in FCML converters, but have not been able to use these methods to allow ZVS across the full range. This work uses dynamic level selection and variable frequency control to increase inductor current ripple at duty cycle ranges for which ZVS was previously unattainable. An experimental 5-level FCML prototype has been built using GaN devices on a single-sided PCB to demonstrate this control technique. We demonstrate 4-level and 5-level operation with ZVS at duty cycles that are not possible with 5-level operation alone, as well as a dynamic level transition with active capacitor voltage balancing.
AB - This paper presents a control technique for flying capacitor multi-level (FCML) converters to achieve zero-voltage switching (ZVS) across the full range of duty cycles, with application in high power density and high efficiency power converters. Previous works have used variable frequency control to enable ZVS at specific duty cycles in FCML converters, but have not been able to use these methods to allow ZVS across the full range. This work uses dynamic level selection and variable frequency control to increase inductor current ripple at duty cycle ranges for which ZVS was previously unattainable. An experimental 5-level FCML prototype has been built using GaN devices on a single-sided PCB to demonstrate this control technique. We demonstrate 4-level and 5-level operation with ZVS at duty cycles that are not possible with 5-level operation alone, as well as a dynamic level transition with active capacitor voltage balancing.
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U2 - 10.1109/COMPEL.2018.8460086
DO - 10.1109/COMPEL.2018.8460086
M3 - Conference contribution
AN - SCOPUS:85054515164
SN - 9781538655412
T3 - 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018
BT - 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018
Y2 - 25 June 2018 through 28 June 2018
ER -