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.

A Novel High Power Factor Soft-Switching Converter

2012 ◽  
Vol 433-440 ◽  
pp. 5549-5555
Author(s):  
Yun Tao Yue ◽  
Yan Lin
Keyword(s):  
Power Factor ◽  
High Power ◽  
Power Supply ◽  
High Efficiency ◽  
Soft Switching ◽  
Switching Converter ◽  
Turn On ◽  
High Power Factor ◽  
Power Factor Corrector ◽  
Zero Voltage

A novel scheme of low power communication power supply with high power factor and soft-switching is presented, a power factor corrector and dc/dc converter of passive lossless soft-switching is based on a ML4803 IC control. DC/DC converter introduces a novel two-transistor forward soft-switching technique, which realizes zero-voltage turn-on and turn-off, with no additional switches. a communication power supply module is developed in this paper. It has the characteristics of rapid dynamic response, high power factor, high efficiency and small bulk ect.

scholarly journals Small-Signal Modeling of Marine Electromagnetic Detection Transmitter Controlled-Source Circuit

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Haijun Tao ◽  
Yiming Zhang ◽  
Xiguo Ren
Keyword(s):  
Electromagnetic Waves ◽  
Frequency Conversion ◽  
Input Voltage ◽  
Current Transformer ◽  
Soft Switching ◽  
Small Signal ◽  
Large Power ◽  
Loop Control ◽  
Controlled Source ◽  
Low Efficiency

Marine electromagnetic transmitter transmits electromagnetic waves with large power frequency conversion to the seabed to obtain the submarine structure and mineral resources. However, the current transmitter presents several problems, such as low efficiency, serious heat, and poor adaptability to the load. Soft-switching controlled-source circuit is used to reduce circuit losses. The mathematical model of controlled-source circuit should be established to realize a closed-loop control for increasing the output transient performance of electromagnetic waves. Given that the soft-switching controlled-source circuit has more status and that direct modeling is difficult, small-signal model of soft-switching controlled-source circuit is established based on that of hard-switching controlled-source circuit by analyzing the effect of output filter inductor current transformer leakage inductance and input voltage soft-switching controlled circuit on change in the duty cycle. Finally, experiments verify the accuracy and validity of the model.

Modeling of Soft-Switching Losses of IGBTs in High-Power High-Efficiency Dual-Active-Bridge DC/DC Converters

2013 ◽  
Vol 60 (2) ◽  
pp. 587-597 ◽  
Author(s):  
Gabriel Ortiz ◽  
Hirofumi Uemura ◽  
Dominik Bortis ◽  
Johann Walter Kolar ◽  
Oscar Apeldoorn
Keyword(s):  
High Power ◽  
High Efficiency ◽  
Soft Switching ◽  
Dual Active Bridge ◽  
Switching Losses

scholarly journals An Improved Current-Doubler Rectifier for the Marine Controlled Source Electromagnetic Transmitter

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Hongxi Song ◽  
Yiming Zhang ◽  
Yu Zhang
Keyword(s):  
Direct Current ◽  
Transformation Efficiency ◽  
Heating Temperature ◽  
Mineral Resources ◽  
Load Range ◽  
Zero Voltage Switching ◽  
Controlled Source ◽  
Insulated Gate Bipolar Transistor ◽  
Electromagnetic Transmitter ◽  
Zero Voltage

High power marine controlled source electromagnetic transmitters have gained interest with applications in marine geological survey and mineral resources exploration. The direct current to direct current (DC-DC) converter that is typically used in marine transmitters has some issues, as the insulated-gate bipolar transistor (IGBT) tube cannot achieve zero-voltage switching (ZVS). In particular, lagging-leg switching cannot easily achieve ZVS. The conversion efficiency of the heat converter requires improvement. This paper proposes an improved current-doubler rectifier for the marine controlled source electromagnetic transmitter (ICDR-MCSET). Resonant inductance is increased and a blocking capacitor is added to the converter (DC-DC) circuit, where the converter can achieve ZVS in a wide load range. This results in the effective decrease of the heating temperature and the improvement of transformation efficiency. Saber software simulation and a 20 KW electromagnetic transmitter are used to verify the results, which show that the method is feasible and effective.

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