The effect of stress on the frequency conversion efficiency of the large aperture frequency converter

AbstractIn order to solve the problem that the long cable variable voltage and variable frequency (VVVF) system does not adopt an effective capacitor voltage sharing control method, resulting in a poor effect of resonance overvoltage control, the resonance overvoltage control algorithm of the long cable VVVF system based on discrete mathematics is studied. First, the long cable frequency conversion drive system is established. In order to ensure voltage loss in the range of motor requirements, a frequency converter–cable–motor (ICM) system connection mode is used to maintain the system operation. Based on the research of the capacitor voltage balance control strategy of a long cable frequency conversion drive system, the discrete mathematical model of the AC side of the ICM system is established by using this control strategy. The improved constant active power controller is obtained by establishing the mathematical model, and the resonant overvoltage in a long cable frequency conversion drive is realized by using the constant active power controller. The experimental results show that the algorithm can effectively control the resonance overvoltage phenomenon in the long cable frequency control system, and the control accuracy is over 97%. It has good performance and can be applied in practice.

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Soliton crystal 50G Hz micro-comb for Q-band microwave frequency conversion

10.36227/techrxiv.11530251.v1 ◽

2020 ◽

Author(s):

David Moss

Keyword(s):

High Performance ◽

Frequency Conversion ◽

Frequency Converter ◽

Microwave Frequency ◽

Local Oscillator ◽

Rf Power ◽

Potential Cost ◽

Frequency Converters ◽

Spurious Suppression ◽

Good Agreement

We report a broadband microwave frequency converter based on a coherent Kerr optical micro-comb generated by an integrated micro-ring resonator. The coherent micro-comb displays features that are consistent with soliton crystal dynamics with an FSR of 48.9-GHz. We use this to demonstrate a high-performance millimeter-wave local oscillator at 48.9-GHz in the Q-band for microwave frequency conversion. We experimentally verify the microwave performance up to 40 GHz, achieving a ratio of −6.8 dB between output RF power and IF power and a spurious suppression ratio of > 43.5 dB. The experimental results show good agreement with theory and verify the effectiveness of microwave frequency converters based on coherent optical micro-combs, with the ability to achieve reduced size, complexity, and potential cost.

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Estimation of frequency conversion efficiency of THz devices using a ballistic electron wave swing circuit model

Semiconductor Science and Technology ◽

10.1088/0268-1242/31/6/065003 ◽

2016 ◽

Vol 31 (6) ◽

pp. 065003

Author(s):

Christian Schildbach ◽

Duu Sheng Ong ◽

Hans Hartnagel ◽

Lorenz-Peter Schmidt

Keyword(s):

Conversion Efficiency ◽

Frequency Conversion ◽

Circuit Model ◽

Electron Wave ◽

Ballistic Electron

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Applied Research on the Closed-Loop Control of Oil Production System with Progressing Cavity Pump

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.248.119 ◽

2012 ◽

Vol 248 ◽

pp. 119-123

Author(s):

Duan Yin Zhu ◽

Jian Ning Xu ◽

Yan Xiong Gao ◽

Wen Jie Lv

Keyword(s):

Production System ◽

Closed Loop ◽

Frequency Conversion ◽

Rotation Speed ◽

Frequency Converter ◽

Dynamic Change ◽

Oil Production ◽

Closed Loop Control ◽

Loop Control ◽

Highly Efficient

It aimed to dynamic change of oilfield productivity, maked sure that the progressing cavity pump is working in a highly efficient region. It combined variable frequency conversion technology and dynamic liquid level height control technology, the closed-loop control of oil production system with progressing cavity pump is made up of rotation-speed and torsion sensor, stepless motor, frequency converter, PLC and progressing cavity pump. The result show that the system can control the pump submergence depth by adjusting the rotation-speed and torsion of polish rod, and make sure the pump working in a highly efficient region finally. This system also can increase recovery efficiency and pump service life.

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Application of Frequency Converter Driver in Long Belt Conveyor

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.340.19 ◽

2011 ◽

Vol 340 ◽

pp. 19-22 ◽

Cited By ~ 1

Author(s):

Guo Huan Lou ◽

Hai Li Yin ◽

Shu Jie Li

Keyword(s):

Frequency Conversion ◽

Frequency Converter ◽

Belt Conveyor ◽

Long Distance ◽

Adjustable Speed Drive ◽

Constant Torque ◽

Start Up ◽

Torque Load ◽

Adjustable Speed ◽

Synchronous Drive

With the frequency converter for driving belt conveyor, the synchronous control of torque and speed for the belt-drive unit can be achieved and the start-up characteristics of belt conveyor can also be improved. This paper uses two methods for achieving synchronous drive of belt conveyor, one is synchronization through master-slave control of frequency converter itself, the second is adding external algorithm implemented by PLC systems. This article describes a variable-frequency adjustable-speed drive system used for long distance belt conveyor in mine main inclined shaft or ground. This frequency conversion device and system can be applied to the adjustable-speed drive process of constant torque load for conveyor.

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Advance Control Experiment of Vibration Machine with High Vibration Intensity Based on SCM – Dynamics Characteristics and Advanced Control

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.912-914.554 ◽

2014 ◽

Vol 912-914 ◽

pp. 554-558

Author(s):

Xiao Lan Yang ◽

Ji Feng Liu ◽

Meng Nan Si ◽

Jia Wei Li ◽

Biao Huang

Keyword(s):

Frequency Conversion ◽

Frequency Converter ◽

Vibration Exciter ◽

Vibration Machine ◽

Vibration Intensity ◽

Strongly Nonlinear ◽

Advanced Control ◽

Vibration Stress ◽

Double Mass ◽

Intensity Characteristic

The vibration-stress field could be formed by high vibration intensity in vibration machine to improve the ability of the collision, shock, shear and extrusion for the system, and it also can avoid plugging screen for vibration screening machine, which could make for solving some special requirements of the vibration machine. To research the vibration machines strongly nonlinear and high vibration intensity characteristic such as certain excitation and uncertain response, the vibration machine with its double-mass is built, and its vibration exciter uses two partial blocks as vibration motor. In addition, dynamic vibration differential equation is established. To achieve high vibration intensity results based on the vibration machines safe working, the advanced control based on the SCM and Intelligent frequency conversion is put forward, and the advanced control system with its host computer, frequency converter, SCM, charge-amplifier, sensor and the vibration machine is been established.

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Frequency conversion efficiency limitation in periodically poled KTP crystals and waveguides

10.1117/12.379949 ◽

2000 ◽

Cited By ~ 2

Author(s):

Moshe B. Oron ◽

David Eger ◽

Moti Katz ◽

Ariel Bruner ◽

Abraham Englander ◽

...

Keyword(s):

Conversion Efficiency ◽

Frequency Conversion ◽

Periodically Poled ◽

Periodically Poled Ktp

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Design of Small Step Frequency Conversion Module in S Band

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.263-266.152 ◽

2012 ◽

Vol 263-266 ◽

pp. 152-156

Author(s):

Yong Xie ◽

Sheng Liang ◽

Gao Feng Pan ◽

Jun Xue

Keyword(s):

Design Problem ◽

Main Part ◽

Frequency Conversion ◽

Frequency Converter ◽

Small Step ◽

Step Frequency ◽

Two Stage ◽

Conversion Technology

The small step frequency conversion module is an important unit for a type of simulation equipment. This paper tries to design a kind of small step frequency conversion module which solves the design problem of frequency converter in simulation equipment. The study of small step frequency conversion technology is the main part in this paper. It is using two-stage PLL and DDS which sets frequency and controls step, to meet the design need.

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