TY - GEN
T1 - Constant Effective Duty Cycle Control for Flying Capacitor Balancing in flying Capacitor Multi-Level Converters
AU - Stillwell, Andrew
AU - Candan, Enver
AU - Pilawa-Podgurski, Robert C.N.
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/9/10
Y1 - 2018/9/10
N2 - One of the challenges of utilizing Flying Capacitor Multi-Level (FCML) converters is the flying capacitor balancing. Poorly balanced flying capacitors increase the switch voltage stress, which is detrimental to performance and device rating requirements. Previously, valley current detection was shown as a potential method to balance flying capacitors, but the method suffers from poor flying capacitor balancing performance at light load. Here, we investigate the light load conditions that lead to poor balancing and propose a new method, constant effective duty cycle (CEDC) compensation, which provides active balancing for the full load range of the converter. The proposed method is validated with an 4-level FCML experimental prototype, demonstrating excellent flying capacitor balancing over all load ranges and across multiple induced flying capacitor imbalances.
AB - One of the challenges of utilizing Flying Capacitor Multi-Level (FCML) converters is the flying capacitor balancing. Poorly balanced flying capacitors increase the switch voltage stress, which is detrimental to performance and device rating requirements. Previously, valley current detection was shown as a potential method to balance flying capacitors, but the method suffers from poor flying capacitor balancing performance at light load. Here, we investigate the light load conditions that lead to poor balancing and propose a new method, constant effective duty cycle (CEDC) compensation, which provides active balancing for the full load range of the converter. The proposed method is validated with an 4-level FCML experimental prototype, demonstrating excellent flying capacitor balancing over all load ranges and across multiple induced flying capacitor imbalances.
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U2 - 10.1109/COMPEL.2018.8460000
DO - 10.1109/COMPEL.2018.8460000
M3 - Conference contribution
AN - SCOPUS:85054495284
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 -