Electrical prospecting signal transmission device capable of suppressing electromagnetic coupling interference and electrical prospecting signal transmission method using same

Patent metadata

Field	Value
Publication number	US-11846744-B2
Application number	US-202217687192-A
Country	US
Kind code	B2
Filing date	Mar 4, 2022
Priority date	Mar 31, 2020
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

An electrical prospecting signal transmission device capable of suppressing electromagnetic coupling interference, including a rectangular wave signal source, an output circuit for supplying power to the ground and a plurality of transmission channels. Each of the plurality of transmission channels includes an isolated driving circuit, a low-pass filter circuit and a power amplification circuit connected sequentially in series. The rectangular wave signal source is configured to generate a rectangular wave or a composite rectangular wave. A signal output terminal of the rectangular wave signal source is connected to an input terminal of the isolated driving circuit, and an output terminal of the power amplification circuit is connected to the output circuit to supply power to the ground.

First claim

What is claimed is:

1. An electrical prospecting signal transmission device capable of suppressing electromagnetic coupling interference, comprising:
a rectangular wave signal source;
an output circuit for supplying power to ground; and
a plurality of transmission channels;
wherein each of the plurality of transmission channels comprises an isolated driving circuit, a low-pass filter circuit and a power amplification circuit sequentially connected in series; the rectangular wave signal source is configured to generate a rectangular wave or a composite rectangular wave; a signal output terminal of the rectangular wave signal source is connected to an input terminal of the isolated driving circuit of each of the plurality of transmission channels; and an output terminal of the power amplification circuit of each of the plurality of transmission channels is connected to the output circuit to supply power to the ground.

2. The electrical prospecting signal transmission device of claim 1 , wherein the isolated driving circuit comprises a first resistor, a second resistor, an optocoupler, a first field effect transistor and a second field effect transistor; one end of the first resistor is configured as the input terminal of the isolated driving circuit, and is connected to the output terminal of the rectangular wave signal source; the other end of the first resistor is connected to a first pin of the optocoupler; a second pin of the optocoupler is connected to the ground; a third pin of the optocoupler and a source of the second field effect transistor are connected to a corresponding reference negative power supply VEE of a corresponding transmission channel of the plurality of transmission channels; a fourth pin of the optocoupler is connected to one end of the second resistor, a gate of the first field effect transistor and a gate of the second field effect transistor; the other end of the second resistor and a source of the first field effect transistor are connected to a reference power supply VCC; and a drain electrode of the first field effect transistor is connected to a drain electrode of the second field effect transistor and is configured as an output terminal of the isolated driving circuit.

3. The electrical prospecting signal transmission device of claim 2 , wherein the first field effect transistor is a P-channel enhancement-mode field effect transistor, and the second field effect transistor is an N-channel enhancement-mode field effect transistor.

4. The electrical prospecting signal transmission device of claim 2 , wherein the low-pass filter circuit comprises a capacitor and a first switch; one end of the first switch is configured as an input terminal of the low-pass filter circuit, and is connected to the output terminal of the isolated driving circuit; the other end of the first switch is connected to one end of the capacitor, and is configured as an output terminal of the low-pass filter circuit; the other end of the capacitor is connected to the ground; both ends of the first switch are connected in parallel with a plurality of branches; and each of the plurality of branches comprises a third resistor and a second switch connected in series.

5. The electrical prospecting signal transmission device of claim 4 , wherein low-pass filter circuits of the plurality of transmission channels have the same time constant, and the time constant is set to 0-40 ms.

6. The electrical prospecting signal transmission device of claim 1 , wherein the rectangular wave signal source is a single-chip microcomputer, a complex programmable logic device (CPLD), a field programmable gate array (FPGA), a digital signal processor (DSP), a direct digital synthesizer (DDS) or a sequential logic circuit.

7. The electrical prospecting signal transmission device of claim 1 , wherein output terminals of power amplification circuits of the plurality of transmission channels are separately connected to the output circuit, or are connected in series and then connected to the output circuit, so as to supply power to the ground.

8. An electrical prospecting signal transmission method using the electrical prospecting signal transmission device of claim 1 , comprising:
(S1) generating, by the rectangular wave signal source, a rectangular wave signal or a composite rectangular wave signal; and sending the rectangular wave signal or the composite rectangular wave signal to the plurality of transmission channels;
(S2) in each of the plurality of transmission channels, electrically isolating, by the isolated driving circuit, the rectangular wave signal or the composite rectangular wave signal; and outputting an isolated rectangular wave signal or an isolated composite rectangular wave signal;
(S3) filtering, by the low-pass filter circuit, the isolated rectangular wave signal or the isolated composite rectangular wave signal output by the isolated driving circuit; and outputting a filtered rectangular wave signal or a filtered composite rectangular wave signal;
(S4) amplifying, by the power amplification circuit, the filtered rectangular wave signal or the filtered composite rectangular wave signal output by the low-pass filter circuit; and outputting an amplified rectangular wave signal or an amplified composite rectangular wave signal; and
(S5) allowing amplified rectangular wave signals or amplified composite rectangular wave signals output by power amplification circuits of the plurality of transmission channels to pass through the output circuit to separately power the ground or to be connected in series to power the ground.

9. The electrical prospecting signal transmission method of claim 8 , wherein in step (S3), the number of branches connected to the low-pass filter circuit is adjusted by switching on-off second switches in the low-pass filter circuit, so as to change a time constant of the low-pass filter circuit.

Assignees

• Univ Hunan Science & Technology

Inventors

• Fu Guohong
• Cheng Hui
• Fu Songyuan
• Zhong Xiangqin

Classifications

• G01V3/083 Primary

  Controlled source electromagnetic [CSEM] surveying · CPC title

• G01V3/12

  operating with electromagnetic waves {(operating with millimetre waves G01V8/005)} · CPC title

• G01R29/26

  Measuring noise figure; Measuring signal-to-noise ratio · CPC title

• G01V2003/086

  Processing · CPC title

• G01V3/00 Primary

  Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation · CPC title