scholarly journals Radiation of high-power ultrawideband pulses with elliptical polarization by four-element array of cylindrical helical antennas

2015 ◽  
Vol 33 (4) ◽  
pp. 633-640 ◽  
Author(s):  
Yu.A. Andreev ◽  
A.M. Efremov ◽  
V.I. Koshelev ◽  
B.M. Kovalchuk ◽  
V.V. Plisko ◽  
...  
Keyword(s):  
High Power ◽  
Pulse Generator ◽  
Power Source ◽  
Bipolar Pulse ◽  
Elliptical Polarization ◽  
Wave Transformer ◽  
Element Array ◽  
Helical Antennas ◽  
Elliptically Polarized ◽  
Polarized Radiation

AbstractA high-power source of ultrawideband radiation with elliptical polarization of the field has been created. The source includes a monopolar pulse generator, a bipolar pulse former, a wave transformer with the power divider, and a four-element array of cylindrical helical antennas. The array was excited by bipolar pulses of the length 1 ns and amplitude 225 kV. In the experiments, the pulses of the elliptically polarized radiation with the effective potential of 440 kV and high stability at a pulse repetition rate of 100 Hz were obtained.

scholarly journals High power current pulse generator based on reversible thyristor converter

2020 ◽  
Vol 62 (12) ◽  
pp. 964-971
Author(s):  
V. A. Kuznetsov ◽  
G. D. Polkovnikov ◽  
V. E. Gromov ◽  
V. A. Kuznetsova ◽  
O. A. Peregudov
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
High Power ◽  
Pulse Generator ◽  
Pulse Amplitude ◽  
Power Source ◽  
Current Pulses ◽  
Thyristor Converter ◽  
Capacitor Charge

In metal forming using high power current pulses, it becomes necessary to control both reproduction frequency and pulse amplitude. Description of a generator of high power current pulses with controlled thyristor converter is provided as a power source of charging device (charger) for regulating voltage (pulse amplitude) of capacitor charge. Faults of the generators associated with inrush current in capacitor charge modes are revealed, which reduces quality of supply network. To reduce time of transient processes while lowering voltage across capacitors, application of reverse thyristor converter is applied as a power source. Structural diagram of generator is considered, which includes reversible thyristor converter with separate control, power unit, capacitor recharge device, charger parameters automatic control system and capacitor charge process control system. Calculation of parameters of automatic control system regulators is presented. To obtain optimal transients, standard methodology for setting regulators to a modular optimum was used. In order to reduce overshoot at time of disturbances appearance, which can reach 100 % and higher, socalled logical device was introduced into the automatic control system. It blocks control pulses on thyristors of converter and simultaneously reduces signal at the output of current regulator to zero. Simulation model of high power current pulse generator in MatLab – Simulink environment was synthesized. Analysis of the model was carried out, and graphs are given that explain principle of device operation and transition processes under various operating modes. Generator application will allow user to adjust amplitude of current pulses with high speed and to obtain sufficiently high-quality transient processes of capacitors charge (discharge), which will have beneficial effect on supply network. Application of better converters will significantly increase frequency of reproduction of current pulses.

scholarly journals A Compact High-Power Ultra-Wideband Bipolar Pulse Generator

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Zhaoyang Wu ◽  
Wei Lu ◽  
Enyan Ding ◽  
Xiangyang Bao ◽  
Zhoubing Yang ◽  
...  
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
High Power ◽  
Pulse Generator ◽  
Pulse Generation ◽  
Ultra Wideband ◽  
Marx Generator ◽  
Bipolar Pulse ◽  
Peak Voltage ◽  
Spark Gap

A compact high-power ultra-wideband bipolar pulse generator based on a modified Marx circuit is designed, which is mainly composed of a primary power supply, Marx generator, sharpening and cutoff subnanosecond spark gap switches, and coaxial transmission lines. The Marx generator with modified circuit structure has thirty-two stages and is composed of eight disk-like modules. Each module consists of four capacitors, two spark gap switches, four charging inductors, and a mechanical support. To simplify the design of the charging structure and reduce the number of switches, four groups of inductors are used to charge the capacitors of the Marx generator, two of which are used for positive voltage charging and the other two for negative voltage charging. When the capacitor of each stage is charged to 35 kV, the maximum output peak voltage can reach 1 MV when the Marx generator is open circuit. The high-voltage pulse generated by the Marx generator charges the transmission line and forms a bipolar pulse through sharpening and cutoff switches. All transmission lines used for bipolar pulse generation have an impedance of 10 Ω. When the 950 kV pulse voltage generated by the Marx generator is fed into the transmission line, the bipolar pulse peak voltage can reach 390 kV, the center frequency of the pulse is about 400 MHz, and the output peak power is about 15.2 GW.

scholarly journals The Rabi problem with elliptical polarization

2020 ◽  
Vol 75 (11) ◽  
pp. 937-962
Author(s):  
Heinz-Jürgen Schmidt
Keyword(s):  
Floquet Theory ◽  
Equation Of Motion ◽  
Quantum Spin ◽  
Heun Equation ◽  
Elliptical Polarization ◽  
Third Order ◽  
Polynomial Coefficients ◽  
Resonance Frequencies ◽  
Classical Quantum ◽  
Elliptically Polarized

AbstractWe consider the solution of the equation of motion of a classical/quantum spin subject to a monochromatical, elliptically polarized external field. The classical Rabi problem can be reduced to third-order differential equations with polynomial coefficients and hence solved in terms of power series in close analogy to the confluent Heun equation occurring for linear polarization. Application of Floquet theory yields physically interesting quantities like the quasienergy as a function of the problem’s parameters and expressions for the Bloch–Siegert shift of resonance frequencies. Various limit cases are thoroughly investigated.

scholarly journals Electromagnetic Field Analysis and Design of a Hermetic Interior Permanent Magnet Synchronous Motor with Helical-Grooved Self-Cooling Case for Unmanned Aerial Vehicles

2021 ◽  
Vol 11 (11) ◽  
pp. 4856
Author(s):  
Hae-Sol Lee ◽  
Myeong-Hwan Hwang ◽  
Hyun-Rok Cha
Keyword(s):  
Electromagnetic Field ◽  
Unmanned Aerial Vehicles ◽  
Permanent Magnet ◽  
High Power ◽  
Heat Dissipation ◽  
Power Source ◽  
Flight Duration ◽  
Aerial Vehicles ◽  
Drive Motor ◽  
Interior Permanent Magnet

As unmanned aerial vehicles expand their utilization and coverage, research is in progress to develop low-weight and high-performance motors to efficiently carry out various missions. An electromagnetic field interior permanent magnet (IPM) motor was designed and analyzed in this study that improved the flight performance and flight duration of an unmanned aerial vehicle (UAV). The output power and efficiency of a conventional commercial UAV motor were improved by designing an IPM motor of the same size, providing high power output and high-speed operation by securing high power density, wide speed range, and mechanical stiffness. The cooling performance and efficiency of the drive motor were improved without requiring a separate power source for cooling by introducing the helical-grooved self-cooling case, which has a low heat generation structure. Furthermore, the motor is oil-cooled through rotating power without a separate power source, reducing the weight of the UAV. The heat dissipation characteristics were verified by fabricating a prototype and taking actual measurements to verify the validity of the heat dissipation characteristics. The results of this study are expected to improve the flight duration and performance of UAVs and contribute to the efficiency of the design of a UAV drive motor.

Design of a cascade high-power source with high efficiency

2018 ◽  
Author(s):  
Gangxiong Wu ◽  
Yanyu Wei ◽  
Qian Li ◽  
Xia Lei ◽  
Chong Ding ◽  
...  
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Power Source

High power pulse generator

Ultrasonics ◽  
1979 ◽  
Vol 17 (2) ◽  
pp. 51-52
Author(s):  
Metrotek Inc
Keyword(s):  
High Power ◽  
Pulse Generator ◽  
Power Pulse ◽  
High Power Pulse

scholarly journals Research on Design of Management System for Power Source Equalizing Charge based on FPGA control

2016 ◽  
Vol 12 (02) ◽  
pp. 20
Author(s):  
Haifeng Lin ◽  
Ruili Mao
Keyword(s):  
High Power ◽  
High Capacity ◽  
Power Source ◽  
Super Capacitor ◽  
Power Requirement ◽  
Design Scheme ◽  
Charging Mode ◽  
New Type ◽  
Mixed Power ◽  
Peak Value

The accumulator can store the energy in high capacity, and the super capacitor can charge and discharge in high power. The mixed power source composed by the accumulator and super capacitor not only has the characteristics for both of them but also meets the high-power requirement of high capacity and peak value. How to perform the equalizing charging for multiple power packs is a emphasis in the industry currently. On the basis of analysis for multiple equalizing charging methods, a new type of design scheme based on DC/DC and switch matrix is raised in this project, the thinking of intermittent charging mode is adopted and four BCAP0350 is served as the charging sample to perform the charging and discharging experiment as well as verify the composite charging design scheme is provided with the feasibility.

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