Abstract
In this paper, a novel AC magnetic transmitter current source circuit is proposed for application of frequency domain electromagnetic method (FEM) prospecting. The proposed current source circuit is capable of generating high frequency and high constant amplitude currents, which are key technical problems for FEM. It is suitable for very wide frequencies. The main circuit of the proposed current source consists of a rising-edge enhancing unit, a constant current control unit, and a high voltage clamping unit. Large constant clamping voltage is applied during the rising edge and the falling edge of the alternating square current to obtain a high frequency and high linearity current source. On the current flat stage, the constant current unit provides the energy to the load to ensure the constant amplitude of the output current. Detailed operations of the proposed magnetic current source are given. Simulation and experimental results demonstrate that the proposed circuit achieves short reversal time, the linearity of the rising/falling edge, constant amplitude and low power loss. These are the desired characteristics of the ac square current source probing transmitter for the magnetic FEM applications.
Highlights
The electromagnetic detection method has the advantages of deep exploration depth, high horizontal resolution, strong penetration capability and anti-interference, and has been widely used in geophysical exploration such as mineral exploration, water resources exploration and engineering geological survey [1,2,3,4]
For the key technical problems of frequency domain electromagnetic transmitter, this paper proposes bipolar broadband communication pulse current source circuit, the highest transmission frequency can reach 100 KHz, the maximum emission current is 15 A, the current rises rapidly to the set value with the slope of 107 A/s, the current is quickly turned off from the positive polarity amplitude to the negative polarity amplitude, and there is no dead-time in the middle, it can maintain the current value at 15 A in the flat stage, which achieves wide-band constant amplitude and the current amplitude is greatly improved at high frequencies
The wide-band banner current source circuit proposed in this paper adds constant current control and high voltage clamping measures to the traditional full-bridge circuit model
Summary
The electromagnetic detection method has the advantages of deep exploration depth, high horizontal resolution, strong penetration capability and anti-interference, and has been widely used in geophysical exploration such as mineral exploration, water resources exploration and engineering geological survey [1,2,3,4]. The frequency domain electromagnetic transmitter needs to solve the problems of fast commutation of current, high linearity of commutation, wide frequency transmission (500 Hz ~ 100 KHz) and constant current amplitude. For the key technical problems of frequency domain electromagnetic transmitter, this paper proposes bipolar broadband communication pulse current source circuit, the highest transmission frequency can reach 100 KHz, the maximum emission current is 15 A, the current rises rapidly to the set value with the slope of 107 A/s, the current is quickly turned off from the positive polarity amplitude to the negative polarity amplitude, and there is no dead-time in the middle, it can maintain the current value at 15 A in the flat stage, which achieves wide-band constant amplitude and the current amplitude is greatly improved at high frequencies. The proposed approach provides a solution to the high frequency and high current emission problems encountered in frequency domain transmission systems
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