scholarly journals Voltage Balancing of Multiphase FCML Converters with Coupled Inductors

2021 ◽  
Author(s):  
Daniel H. Zhou ◽  
Minjie Chen
Keyword(s):  
Steady State ◽  
Dynamic Model ◽  
Experimental Results ◽  
Voltage Balancing ◽  
Coupled Inductors ◽  
Periodic Disturbances ◽  
Capacitor Voltage ◽  
Theoretical Predictions ◽  
Flying Capacitors ◽  
Time Required

<div>Flying capacitor voltage balancing is critical for the performance of flying capacitor multilevel (FCML) converters. This paper investigates the intrinsic capacitor voltage balancing of multiphase FCML converters with coupled inductors. It is shown that the coupled inductor provides flying capacitor voltage balancing that minimizes steady-state imbalances due to periodic disturbances compared to converters with uncoupled inductors. A dynamic model of natural balancing of the converter is derived and used to estimate the time required for the flying capacitors to settle from an initial imbalance. The theoretical predictions are verified with analytical derivations, SPICE simulations, and experimental results.</div>

scholarly journals Voltage Balancing of Multiphase FCML Converters with Coupled Inductors

2021 ◽  
Author(s):  
Daniel H. Zhou ◽  
Minjie Chen
Keyword(s):  
Steady State ◽  
Dynamic Model ◽  
Experimental Results ◽  
Voltage Balancing ◽  
Coupled Inductors ◽  
Periodic Disturbances ◽  
Capacitor Voltage ◽  
Theoretical Predictions ◽  
Flying Capacitors ◽  
Time Required

<div>Flying capacitor voltage balancing is critical for the performance of flying capacitor multilevel (FCML) converters. This paper investigates the intrinsic capacitor voltage balancing of multiphase FCML converters with coupled inductors. It is shown that the coupled inductor provides flying capacitor voltage balancing that minimizes steady-state imbalances due to periodic disturbances compared to converters with uncoupled inductors. A dynamic model of natural balancing of the converter is derived and used to estimate the time required for the flying capacitors to settle from an initial imbalance. The theoretical predictions are verified with analytical derivations, SPICE simulations, and experimental results.</div>

A Different View on Dynamic Recrystallization

2012 ◽  
Vol 715-716 ◽  
pp. 235-242 ◽  
Author(s):  
Günter Gottstein
Keyword(s):  
Grain Size ◽  
Steady State ◽  
Dynamic Recrystallization ◽  
Grain Boundaries ◽  
Experimental Results ◽  
Critical Conditions ◽  
New Approach ◽  
Theoretical Predictions

A new approach to dynamic recrystallization (DRX) is introduced. It is based on the assumption that the critical conditions for DRX and the arrest of DRX grain boundaries are related to the development of mobile subboundaries. The theoretical predictions are compared to experimental results during incipient and steady-state DRX. The grain size sensitivity of the DRX grains establishes the desired link between deformation and DRX microstructure.

scholarly journals Improved Capacitor Voltage Balancing Algorithm for a Single-phase T-type Inverter

2021 ◽  
Vol 31.2 (149) ◽  
pp. 15-21
Keyword(s):  
Charge State ◽  
Pulse Width ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Experimental Results ◽  
Modulation Index ◽  
Modulation Method ◽  
Voltage Balancing ◽  
Capacitor Voltage ◽  
Independent Mode

The paper proposes an improved pulse width modulation algorithm to solve the voltage imbalance on DC capacitors for single-phase T-type inverter. By changing the modulation index, the residual states can be applied to the discharge/charge state on the DC capacitors to balance the voltage. The proposed algorithm is validated for application in single-phase T-type inverters in independent mode. The simulation and experimental results have confirmed the effectiveness of the improved pulse width modulation method for single-phase T-type inverter. The paper proposes an improved pulse width modulation algorithm to solve the voltage imbalance on DC capacitors for single-phase T-type inverter. By changing the modulation index, the residual states can be applied to the discharge/charge state on the DC capacitors to balance the voltage. The proposed algorithm is validated for application in single-phase T-type inverters in independent mode. The simulation and experimental results have confirmed the effectiveness of the improved pulse width modulation method for single-phase T-type inverter.

scholarly journals Digitally Controlled 4-Phase Bi-Directional Interleaved Dc-Dc Converter with Coupled Inductors / Digitāli Vadāms 4 Fāžu Divvirziena Līdzstrāvas Pārveidotājs Ar Saistītajām Droselēm

2015 ◽  
Vol 52 (4) ◽  
pp. 18-31 ◽  
Author(s):  
K. Kroics ◽  
U. Sirmelis ◽  
L. Grigans
Keyword(s):  
Steady State ◽  
Magnetic Structure ◽  
Single Phase ◽  
Experimental Results ◽  
Output Current ◽  
Current Stress ◽  
Integrated Magnetics ◽  
Coupled Inductors ◽  
Digitally Controlled ◽  
Current Ripple

Abstract The main advantages of multiphase interleaved DC-DC converters over single-phase converters are reduced current stress and reduced output current ripple. Nevertheless, inductor current ripple cannot be reduced only by an interleaving method. The integrated magnetic structure can be used to solve this problem. In this paper, the application of 2-phase coupled inductor designed in a convenient way by using commercially manufactured coil formers and ferrite cores is analysed to develop a 4-phase interleaved DC-DC converter. The steady state phase and output current ripple in a boost mode of the interleaved bidirectional DC-DC converter with integrated magnetics are analysed. The prototype of the converter has been built. The experimental results of the current ripple are presented in the paper.

Bridgeless SEPIC PFC Converter

2013 ◽  
Vol 313-314 ◽  
pp. 51-54
Author(s):  
Hyun Lark Do
Keyword(s):  
Steady State ◽  
Power Factor ◽  
Experimental Results ◽  
Unity Power Factor ◽  
Steady State Analysis ◽  
Coupled Inductors ◽  
State Analysis

A new bridgeless powerfactor correction (PFC) converter is proposed in this paper. The proposed converter isbased on single-ended primary inductor converter (SEPIC). In the proposed converter, conductionlosses are reduced and efficiency is improved by eliminating bridge diodes. In addition, input currentripple is significantly reduced by utilizing coupled inductors. Like a conventional SEPIC PFCconverter, the proposed converter provides almost unity power factor (PF). Steady-state analysis ofthe proposed converter is performed. Experimental results based on a prototype are alsoprovided to verify the effectiveness and feasibility of the proposed converter.

scholarly journals Performance Examination of SEPIC Based Hybrid Cascaded Single-Phase Multilevel Inverter

2019 ◽  
Vol 9 (2) ◽  
pp. 3644-3648
Keyword(s):  
Steady State ◽  
Single Phase ◽  
Multilevel Inverter ◽  
Passive Components ◽  
Voltage Balancing ◽  
Multilevel Inverters ◽  
Capacitor Voltage ◽  
Performance Examination ◽  
Transportation Applications ◽  
Complete Operation

In the present scenario, reduced part count(RPC) multilevel inverters are become popular compared to traditional multilevel inverters(MLIs). This is mainly due to reduced size and cost and alleviates the issues of more passive components, flying capacitor voltage balancing issues and the requirement of complex switching schemes. Also, the RPC is getting attraction for various industrial and transportation applications. Therefore, in this paper, a novel 17 level inverter is proposed by cascading MLIs with the reduced part count. The complete operation, switching schemes and output are presented to evolve the performance under steady-state conditions using MATLAB software.

Control of a Flexibly Mounted Stabilized Platform

1977 ◽  
Vol 99 (3) ◽  
pp. 174-182
Author(s):  
C. R. Burrows ◽  
T. P. Adams
Keyword(s):  
Control System ◽  
Steady State ◽  
Dynamic Performance ◽  
Digital Simulation ◽  
Experimental Results ◽  
Governing Equations ◽  
Positional Accuracy ◽  
Theoretical Predictions ◽  
Stabilized Platform ◽  
Improve Stability

The governing equations for a flexibly mounted stabilized platform are derived and solved using digital simulation. Theoretical predictions for the static and dynamic performance are compared with experimental results. This leads to a study of the effects of modifying the control system to improve stability and steady-state positional accuracy.

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