A High-Bandwidth Parallel Active Balancing Controller for Current-Controlled Flying Capacitor Multilevel Converters

Iyer, Rahul K.; Petric, Ivan Z.; Bayliss, Roderick S.; Brooks, Nathan C.; Pilawa-Podgurski, Robert C. N.

doi:10.1109/apec43580.2023.10131437

Cited by 7 publications

(2 citation statements)

References 16 publications

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“…During operation, said DC voltage value is ideally maintained by the natural balancing capability when employing Phase-Shifted PWM (PSPWM). However, in reality, natural balancing might not suffice [10][11][12], and, consequently, the active balancing concepts of the FCs [30,31] must be implemented to guarantee reliable performance of the motor drive.…”

Section: L-fccmentioning

confidence: 99%

“…The latter can be avoided by increasing the switching frequency in overload periods, which, however, increases the implementation complexity. Moreover, the FC voltages might require active control due to shortcomings in the natural balancing behavior when operated with, e.g., non-ideal source impedances, gate drive delays, and input voltage startup/fluctuations [10][11][12], which adds to the previously mentioned complexity.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Evaluation of Three-Phase Three-Level Flying Capacitor and Stacked Polyphase Bridge GaN Inverter Systems for Integrated Motor Drives

Rohner,

Huber,

Mirić

et al. 2024

Electronics

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This article presents a comprehensive comparative evaluation of a three-phase Three-Level (3L) Flying Capacitor Converter (FCC) and a spbi, specifically a converter system formed by two Series-Stacked Two-Level three-phase Converters (2L-SSC), for the realization of a 7.5 kW Integrated Motor Drive (IMD) with a high short-term overload capability. The 2L-SSC requires a motor with two three-phase windings and a split DC-link, but uses standard six-switch, two-level transistor configurations. In contrast, the bridge legs of the 3lfcc feature flying capacitors whose voltages must be actively balanced. Despite the 800 V DC-link voltage, both topologies employ the same set of 650 V GaN power transistors, i.e., the same total chip area, and if operated at the same switching frequency, show identical semiconductor losses. edm damage of the motor bearings is a relevant issue caused by the common-mode (CM) voltages of the inverter stage. The high effective switching frequency of the 3lfcc and the possibility of CM voltage canceling in the 2L-SSC facilitate mitigation of edm by means of CM chokes, whereby a substantially smaller CM choke with lower losses suffices for the 2L-SSC; based on exemplary designs, the 2L-SSC features only about 75% of the total volume and 85% of the nominal losses of the 3lfcc. If, alternatively, motor-friendliness is maximized by including DC-referenced sine-wave output filters, the 3lfcc’s higher effective switching frequency and the 2L-SSC’s need for two sets of filters due to the dual-winding-set motor change the outcome. In this case, the 3lfcc features only about 60% of the volume and only about 55% of the 2L-SSC’s nominal losses.

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Section: L-fccmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative Evaluation of Three-Phase Three-Level Flying Capacitor and Stacked Polyphase Bridge GaN Inverter Systems for Integrated Motor Drives

Rohner,

Huber,

Mirić

et al. 2024

Electronics

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Comparison of Voltage Balance and State Estimation Dynamics for Hybrid Switched-Capacitor Converter Topologies

Datta,

Stauth

2023

2023 IEEE 24th Workshop on Control and Modeling for Power Electronics (COMPEL)

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A Combined Power Factor Correcting and Active Voltage Balancing Control Technique for Buck-Type AC/DC Grid-Tied Flying Capacitor Multilevel Converters

Bayliss,

Brooks,

Pilawa-Podgurski

2023

2023 IEEE 24th Workshop on Control and Modeling for Power Electronics (COMPEL)

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Single-stage Power Factor Correction (PFC) ac-dc rectifiers open a pathway to achieve high power density and efficiency in grid-connected rectifier applications where the target dc voltage is lower than the peak ac voltage (e.g. data center power delivery, LED drivers). Typically in data center and similar applications, a two-stage solution employing a step-up ac-dc stage followed by a step-down dc-dc stage is employed to achieve grid to 48 V conversion. This approach suffers from the efficiency penalty of a cascade of power converters and typically lower power density due to the design of two separate power conversion stages. A single-stage, buck-type PFC rectifier where the output dc voltage is lower than the peak ac voltage circumvents these issues. This work analyzes and develops a single-stage bucktype PFC rectifier utilizing a six-level flying capacitor multilevel (FCML) converter with active flying capacitor voltage balancing and current control to achieve high power density rectification in a single-stage solution. This work is the first to achieve active balancing of capacitors combined with PFC operation in a stepdown FCML rectifier.

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A High-Bandwidth Parallel Active Balancing Controller for Current-Controlled Flying Capacitor Multilevel Converters

Cited by 7 publications

References 16 publications

Comparative Evaluation of Three-Phase Three-Level Flying Capacitor and Stacked Polyphase Bridge GaN Inverter Systems for Integrated Motor Drives

Comparative Evaluation of Three-Phase Three-Level Flying Capacitor and Stacked Polyphase Bridge GaN Inverter Systems for Integrated Motor Drives

Comparison of Voltage Balance and State Estimation Dynamics for Hybrid Switched-Capacitor Converter Topologies

A Combined Power Factor Correcting and Active Voltage Balancing Control Technique for Buck-Type AC/DC Grid-Tied Flying Capacitor Multilevel Converters

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