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

Research on Controlling Method of High-Power Electromagnetic Transmitter Power Supply

2013 ◽  
Vol 339 ◽  
pp. 614-620
Author(s):  
Fei Yu
Keyword(s):  
High Power ◽  
Power Supply ◽  
Control Method ◽  
Current Loop ◽  
Complex Environments ◽  
Loop Control ◽  
Transmitter Power ◽  
Current Sharing ◽  
Current Sharing Control ◽  
Electromagnetic Transmitter

High-power electromagnetic transmitter power supply is an important part of deep geophysical exploration equipment, especially in complex environments, where how to control the high accuracy and stable output of the power supply as well as the redundancy safety of the system become the key issue in its designing. A triple-loop control including inner current loop, outer voltage loop and load current forward feedback and a digitalized voltage/current sharing control method are proposed for the realization of the rapid, stable and highly accurate output of the system. System simulation and field geological exploration experiments demonstrate the effectiveness of the control method which could ensure both the systems excellent stability and the outputs accuracy.

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.

scholarly journals Three-Level DC-DC Controlled-Source Circuit of Marine Electromagnetic Detection Transmitter

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Haijun Tao ◽  
Guopeng Zhang ◽  
Zheng Zheng
Keyword(s):  
High Power ◽  
Electromagnetic Waves ◽  
High Efficiency ◽  
Mineral Resources ◽  
Soft Switching ◽  
High Voltage Power Supply ◽  
Controlled Source ◽  
Detection Depth ◽  
In Series ◽  
Electromagnetic Transmitter

Nowadays, marine electromagnetic method is a geophysical method which can effectively explore natural gas hydrate (NGH) resources. This method acquires seafloor structure and distribution laws of mineral resources by transmitting high-power electromagnetic waves to the seafloor, and its detection depth relies on the intensity of transmitted electromagnetic waves. At present, marine electromagnetic transmitter is not proper for transmission of high-power electromagnetic waves, and therefore, a novel controlled-source circuit of soft switching three-level marine electromagnetic transmitter is proposed in this paper, one step-down winding is added at the secondary side of high-frequency transformer in series connection with a linear inductor, asymmetric phase-shift PWM control is used, and soft switching of controlled-source circuit within the overall power range is realized. A detailed analysis of the operation process and circuit characteristics is given, and finally, a prototype is designed. Experimental results indicate that this circuit is of wide ZVS range and high efficiency, and it meets requirements for deep-sea detection of high-voltage power supply transmitter.

Dynamic Modeling and Wear-Based Remaining Useful Life Prediction of High Power Clutch Systems

2005 ◽  
Vol 48 (2) ◽  
pp. 208-217 ◽  
Author(s):  
Matthew Watson ◽  
Carl Byington ◽  
Douglas Edwards ◽  
Sanket Amin
Keyword(s):  
Dynamic Modeling ◽  
High Power ◽  
Life Prediction ◽  
Remaining Useful Life ◽  
Useful Life
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