Modeling of Capacitor Voltage Imbalance in Flying Capacitor Multilevel DC-DC Converters

Janko Celikovic; Ratul Das; Hanh Phuc Le; Dragan Maksimovic

doi:10.1109/COMPEL.2019.8769615

Modeling of Capacitor Voltage Imbalance in Flying Capacitor Multilevel DC-DC Converters

Janko Celikovic
, Ratul Das
, Hanh Phuc Le
, Dragan Maksimovic

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

44 Scopus citations

Abstract

This paper is focused on modeling of capacitor voltage imbalance in N-level flying capacitor multilevel (FCML) converters in the presence of imperfections in timing of control signals. A general state-space representation is developed to facilitate applications of two time-domain modeling methods: An exact numerical steady-state solution based on the augmented state-space approach, and a simpler approach based on linear-ripple inductor-current approximation. Examples of 4-level and 5-level FCML converters are examined to show how voltage imbalance depends on control signal timing mismatches, circuit parameter values, and N. It is shown how substantial differences between even-level and odd-level FCML converters can be related to rank reduction in the linear-ripple model under ideal timing conditions. Modeling results are verified by circuit simulations and experiments on a reconfigurable FCML prototype.

Original language	English (US)
Title of host publication	2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781728118420
DOIs	https://doi.org/10.1109/COMPEL.2019.8769615
State	Published - Jun 2019
Externally published	Yes
Event	20th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2019 - Toronto, Canada Duration: Jun 17 2019 → Jun 20 2019

Publication series

Name	2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019

Conference

Conference	20th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2019
Country/Territory	Canada
City	Toronto
Period	6/17/19 → 6/20/19

Bibliographical note

Publisher Copyright:
© 2019 IEEE.

Publisher link

10.1109/COMPEL.2019.8769615

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Celikovic, J., Das, R., Le, H. P., & Maksimovic, D. (2019). Modeling of Capacitor Voltage Imbalance in Flying Capacitor Multilevel DC-DC Converters. In 2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019 Article 8769615 (2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/COMPEL.2019.8769615

Modeling of Capacitor Voltage Imbalance in Flying Capacitor Multilevel DC-DC Converters. / Celikovic, Janko; Das, Ratul; Le, Hanh Phuc et al.
2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019. Institute of Electrical and Electronics Engineers Inc., 2019. 8769615 (2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Celikovic, J, Das, R, Le, HP & Maksimovic, D 2019, Modeling of Capacitor Voltage Imbalance in Flying Capacitor Multilevel DC-DC Converters. in 2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019., 8769615, 2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019, Institute of Electrical and Electronics Engineers Inc., 20th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2019, Toronto, Canada, 6/17/19. https://doi.org/10.1109/COMPEL.2019.8769615

Celikovic J, Das R, Le HP, Maksimovic D. Modeling of Capacitor Voltage Imbalance in Flying Capacitor Multilevel DC-DC Converters. In 2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019. Institute of Electrical and Electronics Engineers Inc. 2019. 8769615. (2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019). doi: 10.1109/COMPEL.2019.8769615

Celikovic, Janko ; Das, Ratul ; Le, Hanh Phuc et al. / Modeling of Capacitor Voltage Imbalance in Flying Capacitor Multilevel DC-DC Converters. 2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019. Institute of Electrical and Electronics Engineers Inc., 2019. (2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019).

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title = "Modeling of Capacitor Voltage Imbalance in Flying Capacitor Multilevel DC-DC Converters",

abstract = "This paper is focused on modeling of capacitor voltage imbalance in N-level flying capacitor multilevel (FCML) converters in the presence of imperfections in timing of control signals. A general state-space representation is developed to facilitate applications of two time-domain modeling methods: An exact numerical steady-state solution based on the augmented state-space approach, and a simpler approach based on linear-ripple inductor-current approximation. Examples of 4-level and 5-level FCML converters are examined to show how voltage imbalance depends on control signal timing mismatches, circuit parameter values, and N. It is shown how substantial differences between even-level and odd-level FCML converters can be related to rank reduction in the linear-ripple model under ideal timing conditions. Modeling results are verified by circuit simulations and experiments on a reconfigurable FCML prototype.",

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PY - 2019/6

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AB - This paper is focused on modeling of capacitor voltage imbalance in N-level flying capacitor multilevel (FCML) converters in the presence of imperfections in timing of control signals. A general state-space representation is developed to facilitate applications of two time-domain modeling methods: An exact numerical steady-state solution based on the augmented state-space approach, and a simpler approach based on linear-ripple inductor-current approximation. Examples of 4-level and 5-level FCML converters are examined to show how voltage imbalance depends on control signal timing mismatches, circuit parameter values, and N. It is shown how substantial differences between even-level and odd-level FCML converters can be related to rank reduction in the linear-ripple model under ideal timing conditions. Modeling results are verified by circuit simulations and experiments on a reconfigurable FCML prototype.

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Modeling of Capacitor Voltage Imbalance in Flying Capacitor Multilevel DC-DC Converters

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