scholarly journals WDM burst mode switching

2001 ◽  
Author(s):  
Johnathan Turner
Keyword(s):  
Mode Switching ◽  
Burst Mode

scholarly journals Evaluation of a Three-Phase Bidirectional Isolated DC-DC Converter with Varying Transformer Configurations Using Phase-Shift Modulation and Burst-Mode Switching

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2836
Author(s):  
Nuraina Syahira Mohd Sharifuddin ◽  
Nadia M. L. Tan ◽  
Hirofumi Akagi
Keyword(s):  
Phase Shift ◽  
Voltage Drop ◽  
Load Condition ◽  
Mode Switching ◽  
Power Transfer ◽  
Burst Mode ◽  
Light Load ◽  
Three Phase ◽  
Efficiency Performance ◽  
Intermittent Switching

This paper presents the performance of a three-phase bidirectional isolated DC-DC converter (3P-BIDC) in wye-wye (Yy), wye-delta (Yd), delta-wye (Dy), and delta-delta (Dd) transformer configurations, using enhanced switching strategy that combines phase-shift modulation and burst-mode switching. A simulation verification using PSCAD is carried out to study the feasibility and compare the efficiency performance of the 3P-BIDC with each transformer configuration, using intermittent switching, which combines the conventional phase-shift modulation (PSM) and burst-mode switching, in the light load condition. The model is tested with continuous switching that employs the conventional PSM from medium to high loads (greater than 0.3 p.u.) and with intermittent switching at light load (less than 0.3 p.u), in different transformer configurations. In all tests, the DC-link voltages are equal to the transformer turns ratio of 1:1. This paper also presents the power loss estimation in continuous and intermittent switching to verify the modelled losses in the 3P-BIDC in the Yy transformer configuration. The 3P-BIDC is modelled by taking into account the effects that on-state voltage drop in the insulated-gate bipolar transistor (IGBTs) and diodes, snubber capacitors, and three-phase transformer copper winding resistances will have on the conduction and switching losses, and copper losses in the 3P-BIDC. The intermitting switching improves the efficiency of the DC-DC converter with Yy, Yd, Dy, and Dd connections in light-load operation. The 3P-BIDC has the best efficiency performance using Yy and Dd transformer configurations for all power transfer conditions in continuous and intermittent switching. Moreover, the highest efficiency of 99.6% is achieved at the light power transfer of 0.29 p.u. in Yy and Dd transformer configurations. However, the theoretical current stress in the 3P-BIDC with a Dd transformer configuration is high. Operation of the converter with Dy transformer configuration is less favorable due to the efficiency achievements of lower than 95%, despite burst-mode switching being applied.

scholarly journals Low-load Efficiency Improvement of a Three-Phase Bidirectional Isolated DC-DC Converter (3P-BIDC) Via Enhanced Switching Strategy

2018 ◽  
Vol 7 (4.35) ◽  
pp. 932 ◽  
Author(s):  
N. S. Mohd Sharifuddin ◽  
N. M. L. Tana ◽  
H. Akagi
Keyword(s):  
Phase Shift ◽  
Load Condition ◽  
Mode Switching ◽  
Switching Strategy ◽  
Burst Mode ◽  
Modulation Technique ◽  
Three Phase ◽  
Low Load ◽  
Low Efficiency ◽  
Load Conditions

This paper presents the system design, operation and enhanced switching strategy of a three-phase bidirectional isolated dc-dc converter (3P-BIDC). The paper discusses the operating modes of the 3P-BIDC using phase-shift modulation (PSM), with analysis on its soft-switching characteristics. The phase-shift modulation is the simplest modulation technique that can be applied to the 3P-BIDC. However, it comes with the consequences of low efficiency performance in the low-load conditions. Therefore, this paper investigates the improvement in efficiency of the 3P-BIDC during low-load condition using an enhanced switching strategy combining burst-mode switching and phase-shift modulation. The model of a 700-V, 100-kW, 20-kHz 3P-BIDC and the enhanced switching strategy are verified via simulation using PSCAD. The simulation results shows that the combination of burst-mode and phase-shift modulation technique improves the efficiency of the 3P-BIDC at low-load conditions.  

Burst-Mode CMOS Transimpedance Amplifier Based on a Regulated-Cascode Circuit with Gain-Mode Switching

2019 ◽  
Vol E102.A (6) ◽  
pp. 845-848
Author(s):  
Takuya KOJIMA ◽  
Mamoru KUNIEDA ◽  
Makoto NAKAMURA ◽  
Daisuke ITO ◽  
Keiji KISHINE
Keyword(s):  
Mode Switching ◽  
Transimpedance Amplifier ◽  
Burst Mode

Effective ONU Accommodation through PON Systems with Multi-Stage Splitter Configuration Using ALC Burst-Mode SOAs

2014 ◽  
Vol E97.B (2) ◽  
pp. 432-440 ◽  
Author(s):  
Masamichi FUJIWARA ◽  
Ken-Ichi SUZUKI ◽  
Naoto YOSHIMOTO
Keyword(s):  
Burst Mode ◽  
Multi Stage

scholarly journals Research on predictive sliding mode control strategy for horizontal vibration of ultra-high-speed elevator car system based on adaptive fuzzy

2021 ◽  
Vol 54 (3-4) ◽  
pp. 360-373
Author(s):  
Hong Wang ◽  
Mingqin Zhang ◽  
Ruijun Zhang ◽  
Lixin Liu
Keyword(s):  
Sliding Mode Control ◽  
High Speed ◽  
Sliding Mode ◽  
Mode Switching ◽  
Parameter Uncertainties ◽  
Horizontal Vibration ◽  
Adaptive Fuzzy ◽  
Mode Control ◽  
System A ◽  
Ultra High Speed

In order to effectively suppress horizontal vibration of the ultra-high-speed elevator car system. Firstly, considering the nonlinearity of guide shoe, parameter uncertainties, and uncertain external disturbances of the elevator car system, a more practical active control model for horizontal vibration of the 4-DOF ultra-high-speed elevator car system is constructed and the rationality of the established model is verified by real elevator experiment. Secondly, a predictive sliding mode controller based on adaptive fuzzy (PSMC-AF) is proposed to reduce the horizontal vibration of the car system, the predictive sliding mode control law is achieved by optimizing the predictive sliding mode performance index. Simultaneously, in order to decrease the influence of uncertainty of the car system, a fuzzy logic system (FLS) is designed to approximate the compound uncertain disturbance term (CUDT) on-line. Furthermore, the continuous smooth hyperbolic tangent function (HTF) is introduced into the sliding mode switching term to compensate the fuzzy approximation error. The adaptive laws are designed to estimate the error gain and slope parameter, so as to increase the robustness of the system. Finally, numerical simulations are conducted on some representative guide rail excitations and the results are compared to the existing solution and passive system. The analysis has confirmed the effectiveness and robustness of the proposed control method.

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