Improvement of crosstalk tolerance in optical cross-connects by regenerative frequency converters

1996 ◽  
Vol 32 (19) ◽  
pp. 1801 ◽  
Author(s):  
C. Caspar ◽  
H.-M. Foisel ◽  
E. Patzak ◽  
B. Strebel ◽  
K. Weich
Keyword(s):  
Frequency Converters

Limited ride-through capabilities for direct frequency converters

2001 ◽  
Vol 16 (6) ◽  
pp. 837-845 ◽  
Author(s):  
C. Klumpner ◽  
I. Boldea ◽  
F. Blaabjerg
Keyword(s):  
Frequency Converters

scholarly journals Parasitic Loop Inductances Reduction in the PCB Layout in GaN-Based Power Converters Using S-Parameters and EM Simulations

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1495
Author(s):  
Loris Pace ◽  
Nadir Idir ◽  
Thierry Duquesne ◽  
Jean-Claude De Jaeger
Keyword(s):  
High Frequency ◽  
Printed Circuit Board ◽  
Power Converters ◽  
Calibration Procedure ◽  
Circuit Board ◽  
Design System ◽  
Switching Speed ◽  
Parasitic Inductance ◽  
Frequency Converters ◽  
S Parameters

Due to the high switching speed of Gallium Nitride (GaN) transistors, parasitic inductances have significant impacts on power losses and electromagnetic interferences (EMI) in GaN-based power converters. Thus, the proper design of high-frequency converters in a simulation tool requires accurate electromagnetic (EM) modeling of the commutation loops. This work proposes an EM modeling of the parasitic inductance of a GaN-based commutation cell on a printed circuit board (PCB) using Advanced Design System (ADS®) software. Two different PCB designs of the commutation loop, lateral (single-sided) and vertical (double-sided) are characterized in terms of parasitic inductance contribution. An experimental approach based on S-parameters, the Cold FET technique and a specific calibration procedure is developed to obtain reference values for comparison with the proposed models. First, lateral and vertical PCB loop inductances are extracted. Then, the whole commutation loop inductances including the packaging of the GaN transistors are determined by developing an EM model of the device’s internal parasitic. The switching waveforms of the GaN transistors in a 1 MHz DC/DC converter are given for the different commutation loop designs. Finally, a discussion is proposed on the presented results and the development of advanced tools for high-frequency GaN-based power electronics design.

scholarly journals Insulation Life Span of Low-Voltage Electric Motors—A Survey

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1738
Author(s):  
Vanessa Neves Höpner ◽  
Volmir Eugênio Wilhelm
Keyword(s):  
Life Span ◽  
Electric Motor ◽  
Low Voltage ◽  
Frequency Converter ◽  
Rate Of Change ◽  
High Rate ◽  
Switching Frequency ◽  
Electric Motors ◽  
Frequency Converters ◽  
High Switching Frequency

The use of static frequency converters, which have a high switching frequency, generates voltage pulses with a high rate of change over time. In combination with cable and motor impedance, this generates repetitive overvoltage at the motor terminals, influencing the occurrence of partial discharges between conductors, causing degradation of the insulation of electric motors. Understanding the effects resulting from the frequency converter–electric motor interaction is essential for developing and implementing insulation systems with characteristics that support the most diverse applications, have an operating life under economically viable conditions, and promote energy efficiency. With this objective, a search was carried out in three recognized databases. Duplicate articles were eliminated, resulting in 1069 articles, which were systematically categorized and reviewed, resulting in 481 articles discussing the causes of degradation in the insulation of electric motors powered by frequency converters. A bibliographic portfolio was built and evaluated, with 230 articles that present results on the factors that can be used in estimating the life span of electric motor insulation. In this structure, the historical evolution of the collected information, the authors who conducted the most research on the theme, and the relevance of the knowledge presented in the works were considered.

Current controller design for high switching frequency converters

2016 ◽  
Author(s):  
Roghayeh Gavagsaz-Ghoachani ◽  
Matheepot Phattanasak ◽  
Majid Zandi ◽  
Jean-Philippe Martin ◽  
Babak Nahid-Mobarakeh ◽  
...  
Keyword(s):  
Controller Design ◽  
Switching Frequency ◽  
Frequency Converters ◽  
Current Controller ◽  
High Switching Frequency

Effect of color converters on the performance of solar or light-emitting diode pumped solid-state lasers

2020 ◽  
Vol 22 (5) ◽  
pp. 287-290
Author(s):  
A.A. Sherniyozov ◽  
Sh.D. Payziyev ◽  
G.A. Khalikov ◽  
Kh.F. Zikrillayev ◽  
S.A. Bakhramov ◽  
...  
Keyword(s):  
Luminescence Intensity ◽  
Light Emitting Diode ◽  
Potential Candidate ◽  
Solid State Lasers ◽  
Light Emitting ◽  
Frequency Converters ◽  
External Frequency ◽  
Diode Pumped ◽  
Color Converter ◽  
Nd:Yag Crystal

The effect of using external frequency converters on the luminescence intensity of an Nd:YAG crystal is studied. The crystal is illuminated by light-emitting diode (LED) with and without Y3Al5O12:Ce3+ material as an external converter. Obtained experimental results show that the luminescence intensity of Nd:YAG crystal increased by 1.5 times when Nd:YAG crystal is illuminated by LED together with color converter based on Y3Al5O12:Ce3+ demonstrating that external frequency converters can be a potential candidate for creating more efficient solar or LED pumped lasers.

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