Isolated Ultrafast Gate Driver with Variable Duty Cycle for Pulse and VHF Power Electronics

2020 ◽  
Vol 35 (12) ◽  
pp. 12678-12685
Author(s):  
Xin Zan ◽  
Al-Thaddeus Avestruz
Keyword(s):  
Power Electronics ◽  
Duty Cycle ◽  
Gate Driver

scholarly journals RANCANG BANGUN DC – DC CONVERTER BERBASIS MICROCONTROLLER STM32F4 DAN MATLAB/SIMULINK

2020 ◽  
Vol 8 (1) ◽  
pp. 26-33
Author(s):  
Hilmansyah Hilmansyah ◽  
Restu Mukti Utomo
Keyword(s):  
Renewable Energy ◽  
Duty Cycle ◽  
Buck Converter ◽  
Matlab Simulink ◽  
Gate Driver

DC – DC converter banyak diplikasikan pada renewable energy, sel surya, sistem pengecasan baterai dan mobil listrik. Salah satu metode pada DC – DC converter adalah buck converter. Pada buck converter, tegangan keluaran lebih kecil dari tengangan masukkannya. Pada paper ini, buck converter didesain menggunakan microcontroller STM32F4 berbasis MATLAB/Simulink, TLP521 sebagai pengaman rangkaian daya buck converter dan rangkaian kendali STM32F4, IGBT FGH75T65UPD sebagai komponen switching, dan IR 2111 yang berfungsi sebagai gate driver untuk IGBT. Penanaman program STM32F4 dari MATLAB/Simulink menggunakan waijung blockset. Tegangan masukan pada buck converter didesain sebesar 35 V dengan tegangan keluaran sebesar 3,5 V sampai dengan 31,5 V dengan frekuensi switching pada IGBT maksimum sebesar 100 kHz. Data pada hasil eksperimen menunjukkan bahwa perubahan pada duty cycle akan berpengaruh pada tegangan keluaran, arus keluaran dan effisiensi dari buck converter.

scholarly journals High-Temperature SOI/SiC-Based DC-DC Converter Suite

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Bradley A. Reese ◽  
Brice McPherson ◽  
Robert Shaw ◽  
Jared Hornberger ◽  
Roberto M. Schupbach ◽  
...  
Keyword(s):  
High Temperature ◽  
Duty Cycle ◽  
Feedback Loop ◽  
Design Strategy ◽  
Power Transformers ◽  
Power Switches ◽  
Gate Driver ◽  
Power Inductors ◽  
Effects Of Radiation ◽  
Over Time

A complete design strategy (mechanical and electrical) for a 25 W 28 V/5 V dc-dc converter utilizing SiC and SOI electronics is presented. The converter includes a high-temperature SOI-based PWM controller featuring 150 kHz operation, a PID feedback loop, maximum duty cycle limit, complementary or symmetrical outputs, and a bootstrapped high-side gate driver. Several passive technologies were investigated for both control and power sections. Capacitor technologies were characterized over temperature and over time at 300C∘, power inductors designed and tested up to 350C∘, and power transformers designed and tested up to 500C∘. Northrop Grumman normally-off SiC JFETs were used as power switches and were characterized up to 250C∘. Efficiency and mass optimization routines were developed with the data gained from the first prototype. The effects of radiation on SiC and SOI electronics are then discussed. The results of the first prototype module are presented, with operation from 25C∘ up to an ambient temperature of 240C∘.

A Novel Wide Duty Cycle Range Wide Band High Frequency Isolated Gate Driver for Power Converters

2018 ◽  
Vol 54 (1) ◽  
pp. 437-446 ◽  
Author(s):  
B. Satish Naik ◽  
S. Shan ◽  
L. Umanand ◽  
B. Subba Reddy
Keyword(s):  
Duty Cycle ◽  
High Frequency ◽  
Power Converters ◽  
Wide Band ◽  
Gate Driver

Two-photon excitation microscopy in cellular biophysics

1995 ◽  
Vol 53 ◽  
pp. 62-63
Author(s):  
David W. Piston ◽  
Brian D. Bennett ◽  
Robert G. Summers
Keyword(s):  
Confocal Microscopy ◽  
Laser Beam ◽  
Duty Cycle ◽  
Excited Electronic State ◽  
Input Power ◽  
Two Photon ◽  
Simultaneous Absorption ◽  
Photon Excitation ◽  
Very High ◽  
Two Photon Excitation

Two-photon excitation microscopy (TPEM) provides attractive advantages over confocal microscopy for three-dimensionally resolved fluorescence imaging and photochemistry. Two-photon excitation arises from the simultaneous absorption of two photons in a single quantitized event whose probability is proportional to the square of the instantaneous intensity. For example, two red photons can cause the transition to an excited electronic state normally reached by absorption in the ultraviolet. In practice, two-photon excitation is made possible by the very high local instantaneous intensity provided by a combination of diffraction-limited focusing of a single laser beam in the microscope and the temporal concentration of 100 femtosecond pulses generated by a mode-locked laser. Resultant peak excitation intensities are 106 times greater than the CW intensities used in confocal microscopy, but the pulse duty cycle of 10-5 maintains the average input power on the order of 10 mW, only slightly greater than the power normally used in confocal microscopy.

Acoustic-Reflex Dynamics for Pulsed Signals

1978 ◽  
Vol 21 (2) ◽  
pp. 295-308
Author(s):  
Terry L. Wiley ◽  
Raymond S. Karlovich
Keyword(s):  
Duty Cycle ◽  
Acoustic Impedance ◽  
Normal Hearing ◽  
Broadband Noise ◽  
Threshold Shift ◽  
Temporary Threshold Shift ◽  
Acoustic Reflex ◽  
Stapedius Muscle ◽  
Duty Cycles

Contralateral acoustic-reflex measurements were taken for 10 normal-hearing subjects using a pulsed broadband noise as the reflex-activating signal. Acoustic impedance was measured at selected times during the on (response maximum) and off (response minimum) portions of the pulsed activator over a 2-min interval as a function of activator period and duty cycle. Major findings were that response maxima increased as a function of time for longer duty cycles and that response minima increased as a function of time for all duty cycles. It is hypothesized that these findings are attributable to the recovery characteristics of the stapedius muscle. An explanation of portions of the results from previous temporary threshold shift experiments on the basis of acoustic-reflex dynamics is proposed.

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