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Saturday, April 25, 2020 | History

3 edition of Study of switching transients in high frequency converters found in the catalog.

Study of switching transients in high frequency converters

Study of switching transients in high frequency converters

final report

by

  • 376 Want to read
  • 30 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Transients (Electricity)

  • Edition Notes

    StatementDonald S. Zinger; principal investigator, Malik E. Elbuluk; co-principal investigator, Tony Lee.
    Series[NASA contractor report] -- NASA CR-193105., NASA contractor report -- NASA CR-193105.
    ContributionsElbuluk, Malik E., Lee, Tony., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Paginationv.
    ID Numbers
    Open LibraryOL14702972M

    converter to eliminate the dc transients from the high frequency transformer winding currents during operating phase angle change from one cycle to the next cycle. The proposed two phase shift method controls the alternating nature of high frequency current in transformer windings in one switching cycle without using any high frequency current File Size: 1MB. Dc-dc power converters are employed in a variety of applications, including power supplies for that removes the high-frequency switching harmonics: (a) schematic, (b) switch voltage waveform. v s is chosen to be sufficiently less than the switching frequency f s, so that the filter essentially passes only the dc component of v s. The voltage ripple specifications do not include very high frequency noise generated by the switching transients in the switch and the diode For the initial design calculations, the voltage drop across the diode when conducting can be assumed to be V, the MOSFET ON resistance Rav 50 ml, and you can neglect all other losses including.


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Study of switching transients in high frequency converters Download PDF EPUB FB2

STUDY OF SWITCHING TRANSIENTS IN HIGH FREQUENCY CONVERTERS NASA Grant NAG Final Report Department of Electrical Engineering University of Akron Akron, OH Donald S. Zinger Malik E. Co-Principal Investigator Co-Principal Tony Lee Research Assistant Elbuluk Investigator Prepared For NASA Lewis Research Center Cleveland, OH.

A high frequency ac source is used as the direct input to an ac/ac pulse-density-modulation (PDM) converter. This converter is a new concept which employs zero voltage switching techniques. Get this from a library.

Study of switching transients in high frequency converters: final report. [Donald S Zinger; Malik E Elbuluk; Tony S Lee; United States. National Aeronautics and Space Administration.]. With the existing technology, high frequency power systems become possible.

Use of such a system is advantageous in many aspects. A high frequency ac source is used as the direct input to an ac/ac pulse-density-modulation (PDM) converter. This converter is a new concept which employs zero voltage switching techniques.

This study presents a multi-scale transient model of cascaded H-bridge (CHB) converter for distribution network-interactive studies, which is capable of simulating slow-changing dynamics up to high-frequency switching transients.

The switching pulse behaviours of H-bridges are described using the waveform propagation theory. By taking individual H-bridge sub-modules Author: Hua Ye, Li Kong, Yanan Tang, Wei Pei, Wei Deng.

Develop models for analysis of the electrical high frequency transients occurring in wind parks. The models need to be alidv in a wide frequency range, between 50Hz and 10MHz.

Study the generation and propagation of high frequency transients in cable systems, i.e. oshore wind farms. The inuence of the dierent topologies is to be investigated. Power System Switching Transients Introduction.

An electrical transient occurs on a power system each time an abrupt circuit change occurs. This circuit change is usually the result of a normal switching operation, such as breaker opening or closing or simply turning a light switch on or off. Systems conducted a switch. ing transients study for a new.

“mega” data center that wanted. to protect their six cast coil. transformers against possible. damaging switching transients. caused by the switching of pri. mary vacuum circuit breakers. Switching Induced Transients: Transformer switching is the most commonly performed operation in any power delivery system and most of the times this operation can be performed without any undesirable consequences.

However, given the right combination of system parameters, switching can result in a violent interaction between theFile Size: KB. High frequency transients have been recognized for quite some time as a threat to electronic loads. Low and medium frequency oscillatory transients, such as utility capacitor bank switching, are usually of modest magnitudes but contain substantial energy, so their effects can be felt quite far electrically from the point of origin.

Abstract: High-frequency power converters enabled by wide bandgap (WBG) and silicon semiconductor devices offer distinct advantages in power density and dynamic performance. However, switching oscillations are commonly observed in these circuits with undesirable consequences.

This paper reviews the impacts, root causes, and mitigation techniques of switching Cited by: 5. The proposed Study of switching transients in high frequency converters book features low device stress, high efficiency over a wide load range, and excellent transient performance.

Two experimental prototypes have been built and evaluated. One is a MHz, 23 W converter which uses a high performance rf Cited by: Evaluation of Gallium Nitride Transistors in High Frequency Resonant and Soft-Switching DC–DC Converters Conference Paper in IEEE Transactions on Power Electronics 30(9).

(cont.) Soft switching and soft gating of the devices are employed to achieve efficient operation at a switching frequencies of 75 MHz in the first case and 50 MHz in the latter. In the 75 MHz case, efficiency ranges to 82%. The 50 MHz converter, has efficiencies in the high 70% range.

Of note is low energy storage requirement of this by: Sanjaya Maniktala, in Switching Power Supplies A - Z (Second Edition), As switching frequencies increase, it becomes of paramount importance to reduce the switching losses in the converter.

These are the losses associated with the transition of the switch from its on-state to its off-state, and back. The higher the switching frequency, the greater the number of times the. The currents do not reach high values, compared to the measured voltages, but it is observed high frequency components present in the measured currents as presented in Fig.

7, Fig. The recorded DC voltage transient is presented in Fig. 9, Fig. 10 from opening and closing operation on Switch 2, by: 3. This book consists of three main chapters which addresses important topics in Power Electronics such as: 1: Multilevel Converter Topologies.

This chapter describes traditional multilevel converter topologies with different switching transients and voltage control of capacitors. transient overvoltages as well as a myriad of other switching phenomena within end-user facilities.

Some power electronic devices generate significant transients when they switch. Transient overvoltages can be generated at high frequency (load switching and lightning), medium frequency (capacitor energizing), or low Size: KB.

Capacitor switching transients caused false turn-on of induction furnace SCRs and a short circuit through the converter’s DC bus. Fast-acting fuses blew to clear the short circuit. The fuse blowing event “chopped” current in the supplying transformer, creating huge transient voltages across the bus bars.

Transformer Modelling for High-Frequency Transients Introduction to High-Frequency Models Models for Internal Voltage Calculation Terminal Models Rotating Machines Overview Rotating Machine Models for Low-Frequency Transients Introduction converter’s high-frequency performance.

In this dissertation, the primary objectives are to develop the methodology of high-frequency modeling for the buck and multiphase buck converters, and to analyze their high-frequency characteristics. First, the nonlinearity of the pulse-width modulator (PWM) scheme is identified.

SWITCHING TRANSIENTS INDUCED TRANSFORMER FAILURES Presented to IEEE-IAS – Atlanta Chapter April, 19, By David Shipp, PE Case Study Overview: Data Center Transformer Failure Attributed to Circuit Breaker Induced Switching Transients System Configuration, Failure Analysis and RC Snubber Fix R.

McFadden – JB&B – NY, NY. Transient Recovery Voltages (TRVs) for High-Voltage Circuit Breakers Part 1 Denis Dufournet Chair CIGRE WG A & IEEE WG C, Fellow IEEE San Antonio (USA), 19/09/ Digital Control of High-Frequency Switched-Mode Power Converters (IEEE Press Series on Power Engineering Book 48) - Kindle edition by Corradini, Luca, Maksimovic, Dragan, Mattavelli, Paolo, Zane, Regan.

Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks, note taking and highlighting while reading Digital Control of High-Frequency 5/5(6).

high-frequencyregulators offer a combination of high switching frequency and ease of use, thereby reducing solution size and complexity. Besides solution size, a well-designedhigh switching frequency regulator has the advantage of a faster transient response and reduced output voltage ripple.

published his book ‘Transients in Power Systems’ with many examples of TNA studies. Peterson’s book is a practical survey of the particular phenomena (faults, sudden loss of load, switching surges, and so forth.) that can cause transients and is based on his practical experience with the General Electric Company in the by: Causes and Effects of Transient Voltages file:///C|/Users/Shannon/Documents/Causes%20and%20Effects%20of%20Transient%[06/11/ File Size: 99KB.

Minimizing output ripple and transients from a switching regulator can be important, especially when powering noise-sensitive devices such as high-resolution ADCs, where the output ripple can appear as a distinct spur on the ADC’s output spectrum. Voltage transients in power systems are caused by switching actions, lightning and faults in the system.

Different phenomena create different types of transients. Oscillatory transients are caused mainly by switching phenomena in the network. The most common switching action is capacitor bank switching. switching transients, IEEE Transaction on Power delivery, 27(1), January[2] Pawan Kumar Mehta, Tapash Debnath, Ranabir Mullick, Arijit Banerjee and Poulomi Mitra, Study and Analysis of switching Transient in the Power Distribution Network, Int.

on Recent Trends in Engineering and Technology, 6(1), NovEvolutions in microprocessor technology require the use of a high-frequency synchronous buck converter (SBC) in order to achieve low cost, low profile, fast transient response and high power density.

However, high frequency also causes more power loss on MOSFETs. Optimization of the MOSFETs plays an important role in the system performance.

Abdulahovic, T. Analysis of High-Frequency Electrical Transients in Offshore Wind Parks. Ph.D. Thesis, Chalmers University of Technology, Gothenburg, Sweden, [Google Scholar] Reza, M.; Breder, H. Cable System Transient Study: Vindforsk V Experiments with Switching Transients and Their Mitigation in a Windpower Collection Grid Scale Cited by: 1.

Statistical Protection System Study Monte Carlo Tests for Power Grid Switching Surge System Studies Modular Multilevel Converter in HVDC Applications High-End Super-Large Power Grid Simulations Motor Drive and FPGA-Based Real-Time Simulation Applications You can write a book review and share your experiences.

Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them.

It is not unusual that a frequency converter for big pumps above kW will add extra induction losses of 25–30%. In the upper power range, only a few of the frequency converters have a high switching frequency: to Hz is usual for the former generation of frequency converters.

In addition, a typical mistake is to test with the high-frequency filter of the tester switched on. DC/DC converter spike noise is high-frequency noise from 20 to 50 MHz, and thus leaving the high-frequency filter on naturally prevents measurement.

(See Fig. 9). Back-to-back switching: Energizing the second bank C 2 when the first bank C 1 is already energized is called back- to-back switching [5], and is simulated by closing switch S2 when C 1 is already operating in steady state. The resulting inrush to C 2 is a high-frequency transient which primarily involves the series combination of C 1, LB, and C 2, driven by the voltage V(0) on C File Size: KB.

Transient response can improve with higher switching frequency. Avoids frequency bands in which noise would be disruptive AM Broadcast Vehicle motion/position monitors Drawbacks of High Switching Frequency Efficiency is worse Switching loss is proportional to switching frequency FET Switch drive power is also proportional to frequency, and is.

I was reading about Benefits of High Switching Frequency, I found the following: Smaller converter can be cheaper – up to a certain power output. Beyond that power level small size might be worth some added cost.

Transient response can improve with higher switching frequency. Drawbacks of High Switching Frequency. High-Frequency Switching Power Converters.

The off-chip passive components (inductors and capacitors) in conventional switching power converters are becoming increasingly difficult to accommodate in many electronic devices due to their high cost and large footprint. A switched-mode power supply (switching-mode power supply, switch-mode power supply, switched power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently.

Like other power supplies, an SMPS transfers power from a DC or AC source (often mains power) to DC loads, such as a personal. High-frequency oscillatory transient These transients are linked with power electronics and switching events (e.g.

line or cable energization). Power electronics, like the switching power supply in computers, generate oscillatory voltage transients that repeat several times per 60 Hz cycle. These losses introduce a practical limit for the switching frequency of conventional converters and regulators.

There is, however, a solution: devices that use the Zero-Voltage Switching (ZVS) topology do not suffer from losses in the same way as conventional designs, allowing them to operate at higher frequencies, which in turn improves.