A5063878180- Advanced DC-DC Converters
- Multilevel Inverters and Converters
- Silicon Carbide Semiconductor Technologies
- Microgrid Control and Optimization
- Energy Harvesting in Wireless Networks
- Advanced Battery Technologies Research
- Analog and Mixed-Signal Circuit Design
Colorado Power Electronics (United States)
2019-2024
University of Colorado Boulder
2019-2024
University of Colorado System
2022
This paper is focused on modeling of capacitor voltage imbalance in N-level flying multilevel (FCML) converters the presence imperfections timing control signals. A general state-space representation developed to facilitate applications two time-domain methods: an exact numerical steady-state solution based augmented approach, and a simpler approach linear-ripple inductor-current approximation. Examples 4-level 5-level FCML are examined show how depends signal mismatches, circuit parameter...
This paper presents a modeling method to accurately predict DC and ripple values of flying capacitor voltages inductor currents in hybrid converters by recognizing key relationship between median average these state variables. The is demonstrated for the Dual-Phase Multi-Inductor Hybrid (DP-MIH) converter 3-Level Buck converter. Analytical details intuitive explanations are presented well-known balancing problem current fluctuations converters. Simulation results at different operating...
Ensuring that the flying capacitor voltages are balanced is critical to operation of multilevel (FCML) converters. This paper systematically explores robust voltage balancing FCML converters using coupled inductors. Coupled inductors shown balance with any number levels or even phases, some singularities. Balancing improved an levels, and higher coupling coefficients. The two-phase, three-level converter yields strongest most reliable benefit from inductor balancing. a modest ratio can also...
This paper investigates the modeling, analysis, and design methods for passively balancing flying capacitor multilevel (FCML) converters using coupled inductors. Coupled inductors synergize with FCML by reducing inductor current ripple, switch stress, and, as proven in this paper, providing voltage balancing. enables topologies to be scaled well larger systems. proves that can solve unbalancing problem many converters. Moreover, tools are developed thoroughly explain quantify balancing,...
This paper introduces novel minimum-deviation control methods to improve step-load transient responses in non-inverting (four-switch) buck-boost dc-dc converters. The approach utilizes all possible switching states achieve sub-stantial response improvements compared buck-only or boost-only time-optimal (TOC) methods. Using state-plane trajectory analysis, analytical solutions with necessary conditions are developed for step-up and step-down load scenarios both buck boost modes of operation....
Recent work has demonstrated that utilization of all possible switching states in non-inverting buck-boost (NIBB) DCDC converters leads to substantial transient response improvements compared responses buck-only or boost-only modes operation. This paper presents a hybrid digital controller for NIBB converters, which utilizes PID control and sliding mode based the novel algorithm. The executes with an optimal surface achieving lowest output voltage deviation. implemented enables seamless...
This paper presents a novel autotuning method that intends to improve controller performance in mobile device battery chargers. The chargers have wide range of possible operating conditions and high converter parameter variations, making the design fixed-coefficient controllers challenging task. work aims tackle this issue using comprehensive, yet simple, self-tuning algorithm with goal maximize bandwidth guarantee stability. approach uses single-tone injection, single-node measurement,...
Parameter variations and unpredictable operating environments heavily impact the control performance of battery chargers in mobile device applications. To address this challenge, a comprehensive simple autotuning system has been developed. The algorithm presented work aims to maximize crossover frequency loop while maintaining stability margins. key innovations behind approach are use single-tone injection, single-node measurement, decomposition response signal into in-phase quadrature...