Tricyclic parallel control electrical source transmitter and control method

Abstract

The invention relates to a tricyclic parallel control electrical source transmitter and a control method. A three-phase alternator passes is connected with a ground load through a three-phase rectifying filter circuit, a full-bridge inversion circuit, a high-frequency isolation transformer, a full-bridge rectifying circuit, a filter inductor, a filter capacitor and a pulse current generator, a main controller is respectively connected with the full-bridge inversion circuit, a current loop detecting circuit, a voltage loop detecting circuit, a pulse current loop detecting circuit and the pulse current generator, and the electrical source transmitter is formed. The disadvantage that a single current loop can not be adaptive to characteristic changes of the ground load in a broadband range is remedied, real-time control over the output current is achieved, and control accuracy at the high-frequency moment is improved. The size of the transmitter is reduced substantially, the weight of the transmitter is reduced, and the number of components is reduced, so that the transmitter is more portable. Isolation voltage is larger than two times of the maximum working voltage of the transmitter, safety of equipment and operators is ensured, interference among signals is prevented, and the instrument can work more stably and reliably.

Description

Technical field: [0001] The invention relates to an electrical instrument in geophysical prospecting, especially suitable for transmitting pulse current frequency n×10 -1 Hz~n×10 1 kHz, the amplitude of the transmitting pulse current is tens of amperes, the impedance of the ground electrode is 10-80Ω, and the electromagnetic transmitter is separated by a distance of 0.5km-3km. Background technique: [0002] Among geophysical exploration methods, Controlled Source Audio-frequency Magnetotelluric (CSAMT) is widely used in metal ore detection and geothermal resource exploration due to its high work efficiency, detection accuracy, and horizontal and vertical resolution. , coal field and oil and gas structure exploration and other fields. CSAMT uses electromagnetic transmitters to form artificial field sources, sends electromagnetic wave fields to target areas, and detects underground structures by detecting electric and magnetic field signals through receivers. For the CSAMT ...

AI Technical Summary

Problems solved by technology

This method can adapt to the change of the grounding electrode impedance value of the earth load at low frequencies, but it cannot adapt to the change of the inductance value of the wire at high frequencies. The circuit cannot adjust and control the magnitude of the current value on the earth load

In addition, the device uses a two-speed DC power supply, a step-down chopper current stabilization circuit and a clamping circuit to control the output current on the earth load, and many devices are used, the cost is high, and the design and development cycle is long

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