Design of Transient Electromagnetic Transmitter Based on FPGA

2014 ◽  
Vol 496-500 ◽  
pp. 630-633 ◽  
Author(s):  
Lei Zhang ◽  
Qing Ming Duan ◽  
Hao Sun ◽  
Ting Zhe Huang ◽  
Jun Wei Shi ◽  
...  
Keyword(s):  
High Power ◽  
Detection System ◽  
High Reliability ◽  
Field Application ◽  
Constant Voltage ◽  
Transient Electromagnetic ◽  
Electromagnetic Detection ◽  
Voltage Clamping ◽  
Electromagnetic Transmitter ◽  
Off Time

Transient electromagnetic transmitter is a part of the transient electromagnetic detection system. In the aspect of short turn-off time for high-power current, there are still many problems to be solved urgently. This paper put forward a design scheme of transient electromagnetic transmitter, amplified the control signal with triode, and put forward a kind of passive constant voltage clamping absorbing circuit, which made the turn-off time shorter and the linearity of the emission currents lagging edge higher. This transient electromagnetic transmitter system is portable and easy to operate. Through experiments we can prove that the transmitter has the characteristic of short turn-off time and high reliability, and it has reached the requirements of field application.

Research and Implementation of the Triangular Wave Pulse Power Device

2012 ◽  
Vol 241-244 ◽  
pp. 657-660
Author(s):  
Da Yong Wu ◽  
Sheng Bao Yu
Keyword(s):  
High Reliability ◽  
Pulsed Power ◽  
Pulse Power ◽  
Power Device ◽  
Detection Systems ◽  
Transient Electromagnetic ◽  
Voltage Clamping ◽  
Output Characteristics ◽  
Dual Polarity ◽  
Transmitted Waveform

The pulsed power is an important part of the airborne geophysical method detection systems. However, the traditional method of aerial transient electromagnetic transmitted waveform will cause the interference which is not conducive to process the post-data. The paper presents a new kind of dual polarity triangle pulse power device. The experimental results verify the correctness of theoretical analysis by using constant voltage clamping method to achieve emission of the isosceles triangular current pulse. Its falling edge of high linearity, high reliability, the output characteristics of a good anti-interference ability.

High Power UPS Selection Methodology and Installation Guideline for High Reliability Power Supply

2005 ◽  
Vol 1 (03) ◽  
pp. 396-402
Author(s):  
A. Sudrià ◽  
◽  
E. Jaureguialzo ◽  
A. Samper ◽  
R. Villafáfila ◽  
...  
Keyword(s):  
High Power ◽  
Power Supply ◽  
High Reliability ◽  
Selection Methodology

Design and Characteristics of Microfocus X-ray Source with Sealed Tube and Transmissive Target on Diamond Window

2021 ◽  
Vol 79 (6) ◽  
pp. 631-640
Author(s):  
Takaaki Tsunoda ◽  
Takeo Tsukamoto ◽  
Yoichi Ando ◽  
Yasuhiro Hamamoto ◽  
Yoichi Ikarashi ◽  
...  
Keyword(s):  
Power Density ◽  
High Power ◽  
High Speed ◽  
Electronic Device ◽  
High Reliability ◽  
Electronic Devices ◽  
Lithium Ion ◽  
High Power Density ◽  
High Magnification ◽  
X Ray

Electronic devices such as medical instruments implanted in the human body and electronic control units installed in automobiles have a large impact on human life. The electronic circuits in these devices require highly reliable operation. Radiographic testing has recently been in strong demand as a nondestructive way to help ensure high reliability. Companies that use high-density micrometer-scale circuits or lithium-ion batteries require high speed and high magnification inspection of all parts. The authors have developed a new X-ray source supporting these requirements. The X-ray source has a sealed tube with a transmissive target on a diamond window that offers advantages over X-ray sources having a sealed tube with a reflective target. The X-ray source provides high-power-density X-ray with no anode degradation and a longer shelf life. In this paper, the authors will summarize X-ray source classification relevant to electronic device inspection and will detail X-ray source performance requirements and challenges. The paper will also elaborate on technologies employed in the X-ray source including tube design implementations for high-power-density X-ray, high resolution, and high magnification simultaneously; reduced system downtime for automated X-ray inspection; and reduced dosages utilizing quick X-ray on-and-off emission control for protection of sensitive electronic devices.

scholarly journals Enhanced dynamic voltage clamping capability of Clustered IGBT at turn-off period

2016 ◽  
Vol 29 (1) ◽  
pp. 1-10
Author(s):  
Hong Long ◽  
Mark Sweet ◽  
Sankara Narayanan
Keyword(s):  
Numerical Evaluation ◽  
Load Condition ◽  
Operating Conditions ◽  
Current Gain ◽  
Power Devices ◽  
Inductive Load ◽  
Dynamic Voltage ◽  
Voltage Clamping ◽  
Safe Operating ◽  
Off Time

One of the critical requirements for high power devices is to have rugged and reliable capability against hash operating conditions. In this paper, we present the dynamic voltage clamping capability of 3.3kV Field Stop Clustered IGBT devices under extreme inductive load condition. It shows that PMOS trench gate CIGBT structure with outstanding performance of fast turn-off time and low over-shoot voltage. Further optimization of current gain of CIGBT structure is analyzed through numerical evaluation. A step further in the safe operating area has been achieved for high voltage devices by CIGBT technology.

scholarly journals Research on Mechanical Defect Detection and Diagnosis Method for GIS Equipment Based on Vibration Signal

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5507
Author(s):  
Liang He ◽  
Jie Yang ◽  
Ziwei Zhang ◽  
Zongwu Li ◽  
Dengwei Ding ◽  
...  
Keyword(s):  
Experimental Research ◽  
Detection System ◽  
Engineering Application ◽  
Vibration Signal ◽  
Signal Amplitude ◽  
Field Application ◽  
Large Current ◽  
Three Phase ◽  
Diagnosis Method ◽  
Detection And Diagnosis

Gas insulated switchgear equipment (GIS) is widely used in power system, and more attention has been paid to discharge defects than mechanical defects. However, since mechanical defects are a major cause of the failure in GIS, it is of great significance to carry out relevant research on mechanical defects. Detection and diagnosis methods of mechanical defects based on vibration signal are studied in this paper. Firstly, vibration mechanisms of GIS are analyzed. Due to structural differences between single phase insulated type GIS and three phase insulated type GIS, there are big differences in vibration mechanisms between the two types of GISs. Secondly, experimental research on mechanical defects is carried out based on a 110 kV GIS equipment and a self-developed vibration detection system; results show that mechanical defects can be diagnosed by analyzing signal amplitude, frequency spectrum and waveform distortion rate, and a large current is more beneficial for diagnosing mechanical defects. Lastly, field application has been carried out on 220 kV GIS equipment, and a poor contact defect is found, demonstrating that abnormal diagnosis can be realized by method proposed in this paper. Experimental research and field application demonstrate the feasibility and effectiveness of detection and diagnosis method for mechanical defects based on vibration signal and provide experience for subsequent engineering application.

scholarly journals Arbitrary Frequency Table Transmission Technology for a High-Power Borehole–Ground Electromagnetic Transmitter

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 11502-11507
Author(s):  
Xiaohua Zeng ◽  
Meng Wang ◽  
Sheng Jin ◽  
Hongmei Duan ◽  
Kai Chen
Keyword(s):  
High Power ◽  
Frequency Table ◽  
Electromagnetic Transmitter ◽  
Arbitrary Frequency

Usage of Broadcast Messaging in a Distributed Hash Table for Intrusion Detection

2011 ◽  
pp. 77-93
Author(s):  
Zoltán Czirkos ◽  
Gábor Hosszú
Keyword(s):  
Intrusion Detection ◽  
Intrusion Detection System ◽  
Detection System ◽  
High Reliability ◽  
Hash Table ◽  
User Interaction ◽  
Overlay Network ◽  
Peer To Peer ◽  
Transport Layer ◽  
Distributed Hash Table

In this chapter, the authors present a novel peer-to-peer based intrusion detection system called Komondor, more specifically, its internals regarding the utilized peer-to-peer transport layer. The novelty of our intrusion detection system is that it is composed of independent software instances running on different hosts and is organized into a peer-to-peer network. The maintenance of this overlay network does not require any user interaction. The applied P2P overlay network model enables the nodes to communicate evenly over an unstable network. The base of our Komondor NIDS is a P2P network similar to Kademlia. To achieve high reliability and availability, we had to modify the Kademlia overlay network in such a way so that it would be resistent to network failures and support broadcast messages. The main purpose of this chapter is to present our modifications and enhancements on Kademlia.

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