High-effect large-current electromagnetic transmitting system and method

Abstract

The invention relates to a high-effect large-current electromagnetic transmitting system, and the system comprises a medium-frequency high-voltage power supply, a large-current electromagnetic transmitting module, a main control unit, and an output waveform generator. The large-current electromagnetic transmitting module consists of a medium-frequency high-voltage transformer, a power conversion unit, and a current filter, wherein the medium-frequency high-voltage transformer, the power conversion unit and the current filter are connected together. The medium-frequency high-voltage transformer employs a large-transformer-ratio double-secondary-coil transformer, and the power conversion unit is located at a secondary coil end of the transformer, comprises two branch circuits and can achieve dipolar output, thereby guaranteeing that the symmetrical operation of the transformer in the positive and negative half cycles. Compared with a conventional transmitter, the system greatly improves the efficiency, and changes the topological structure of a conventional electromagnetic transmitting system. The power conversion unit employs a modularized design, and improves the controllability and expandability of the system.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic exploration, and relates to a high-efficiency and high-current electromagnetic emission system and a control method for realizing high-efficiency and high-power electromagnetic emission by using the system. Background technique [0002] Electromagnetic prospecting theory and technology are currently widely used in petroleum exploration, groundwater exploration, geothermal energy exploration, engineering exploration and site selection, mineral resource exploration, active fault exploration, seismic safety assessment, geological mapping, environmental exploration, dam disease diagnosis, The detection of underground buried objects and pipelines, the definition of seawater intrusion and underground pollution, the monitoring of underground resistivity changes, and the study of crust and upper mantle structures are of great significance, especially in energy exploration. Its theoretical methods ...

AI Technical Summary

Problems solved by technology

, the power consumption is concentrated on the power semiconductor device, resulting in concentrated heat and difficult heat dissipation

Especially in the case of limited space and heat dissipation conditions of the electromagnetic transmitter cabin under deep sea detection conditions, the design is more difficult, and the cost and installation difficulty are greatly increased

Especially in the occasions where the load resistance is very small and the output current and power are very large, such as the high-power electromagnetic transmitter of the present invention, the load resistance is tens of mΩ, which is close to a short circuit, and the output current is required to reach 1000A. The high internal resistance of the traditional scheme is much greater than load resistance, so most of the output power is consumed on the internal resistance

The circuit principle of the traditional scheme has inherent topology design defects, so it is difficult to achieve high power conversion and transmission efficiency

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