CN211406004U - Signal transmitting device for reducing transient electromagnetic turn-off time - Google Patents
Signal transmitting device for reducing transient electromagnetic turn-off time Download PDFInfo
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- CN211406004U CN211406004U CN202020442900.2U CN202020442900U CN211406004U CN 211406004 U CN211406004 U CN 211406004U CN 202020442900 U CN202020442900 U CN 202020442900U CN 211406004 U CN211406004 U CN 211406004U
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Abstract
The utility model discloses a reduce signal transmission device of transition electromagnetism turn-off time, electronic switch I including transmitting coil, control transmitting coil connected mode, the electronic switch II of constituteing the bridge arm, transmitting coil is the paired line, and the paired line includes first wire and second wire, and II one ends of electronic switch are connected to first wire, and the one end of electronic switch I is connected to II other ends of electronic switch, and the second wire is connected to the other end of electronic switch I, and the connected mode through I control first wire of electronic switch and second wire both ends is head to head, tail to end or head to tail, forms after first wire and the second wire are connected and sends the return circuit. The utility model discloses can show the turn-off time that reduces emission current, effectively measure early signal of saying, improve the SNR that the late period was said, realize transient electromagnetism shallow layer and deep geological information's effective extraction.
Description
Technical Field
The utility model relates to an electrical prospecting technical field, in particular to reduce signal emission device of transition electromagnetism turn-off time.
Background
The transient electromagnetic method is also called time domain electromagnetic method, and is a method that a primary pulse magnetic field is transmitted to the underground by using an ungrounded loop or a ground wire source, and a secondary eddy current field is observed by using a coil or a ground electrode during the interval of the primary pulse magnetic field. The decay process of the secondary field is generally divided into early, middle and late stages. The early electromagnetic field is equivalent to a high-frequency component in a frequency domain, the attenuation is fast, and the skin depth is small; the late component is equivalent to the low-frequency component in the frequency domain, the attenuation is slow, and the skin depth is large. And the earth electric characteristics of different depths can be obtained by measuring the time change rule of the secondary field of each time period after power failure.
At present, an ungrounded loop is used as a common transient electromagnetic transmitting antenna, the working method of the transmitting antenna is that two groups of switches for forming a bridge arm and a transmitting loop are connected into a full-bridge transmitting circuit to realize the magnetic field transmission of bipolar square wave current, the transmitting loop is usually wound by 2 or more turns of wires or is arranged into a square frame or a rectangular frame, and the side length of a transmitting wire frame is usually designed within the range of n multiplied by 10m to n multiplied by 1Km according to different detection depths. Under the condition that the transmitting voltage U and the antenna of the transient electromagnetic wire frame are unchanged, the turn-off time of the transmitting current in the wire frame hardly changes along with the time. Therefore, the measurement of transient electromagnetic signals is affected by the turn-off time, which causes early data distortion and failure to extract and identify shallow (close) geological information.
Off-time:
wherein the content of the first and second substances,Lin order to transmit the loop inductance,Rin order to transmit the loop resistance,I 0 in order to switch off the current before it,Uis the output voltage before turn-off.
At present, the problem of reducing the primary field off time remains an important problem that those skilled in the field of transient electromagnetism are trying to explore and try to solve.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a simple structure, the high signal emission device who reduces transition electromagnetism turn-off time of reliability.
The utility model provides a technical scheme of above-mentioned problem is: a signal transmitting device for reducing transient electromagnetic turn-off time comprises a transmitting coil, an electronic switch I and an electronic switch II, wherein the electronic switch I is used for controlling the connection mode of the transmitting coil, the electronic switch II forms a bridge arm, the transmitting coil is a twisted pair, the twisted pair comprises a first conducting wire and a second conducting wire, the first conducting wire is connected with one end of the electronic switch II, the other end of the electronic switch II is connected with one end of the electronic switch I, the other end of the electronic switch I is connected with the second conducting wire, the connection mode of the first conducting wire and the second conducting wire is controlled to be in head-to-head connection, tail-to-tail connection or head-to-tail connection through the electronic switch I, and a transmitting loop.
The signal transmitting device for reducing the transient electromagnetic turn-off time comprises an electronic switch II, a power supply and a power supply, wherein the electronic switch II comprises a first switch, a second switch, a third switch and a fourth switch, one end of the first switch and one end of the fourth switch are connected together and then connected to the positive electrode of the power supply, the other end of the first switch and one end of the second switch are connected together and then connected to one end of the electronic switch I as an output electrode B of the electronic switch II, the other end of the fourth switch and one end of the third switch are connected together and then connected to the head end of a first lead as an output electrode A of the electronic switch II, and the other end of the second switch and the other end of the third switch are connected together and then grounded.
The signal transmitting device for reducing the transient electromagnetic turn-off time is characterized in that the electronic switch I is a double-pole double-throw switch, the electronic switch I comprises an upper fixed contact and a lower fixed contact which are positioned in the middle, an upper movable contact I and a lower movable contact I which are positioned in the left side, and an upper movable contact II and a lower movable contact II which are positioned in the right side, the upper fixed contact is connected with an output electrode B of the electronic switch II, the lower fixed contact is connected with the tail end of a first wire, the upper movable contact I and the lower movable contact II are both connected with the tail end of a second wire, and the lower movable contact I and the upper movable contact II are both connected with the head end of the second wire.
According to the signal transmitting device for reducing the transient electromagnetic turn-off time, when a signal is transmitted, the electronic switch I is arranged at the left end, the tail end of the first wire in the transmitting loop formed by the twisted pair is connected with the head end of the second wire, the head end of the first wire is connected with the output electrode A of the electronic switch II, the tail end of the second wire is connected with the output electrode B of the electronic switch II, and magnetic fields generated by currents of the first wire and the second wire are equal in size and same in direction.
When the signal transmitting device for reducing transient electromagnetic turn-off time stops transmitting signals, the first switch and the fourth switch in the electronic switch II are disconnected, the second switch and the third switch are conducted and grounded, the electronic switch I is arranged at the right end, the tail end of a first wire in a transmitting loop formed by a twisted pair is connected with the tail end of a second wire, the head end of the first wire is connected with an output electrode A of the electronic switch II, the head end of the second wire is connected with an output electrode B of the electronic switch II, at the moment, a load output by the electronic switch II becomes the twisted pair, the resistance is realized, the inductance is zero, after the signal transmitting device is turned off, if currents exist in the first wire and the second wire of the twisted pair, the currents are equal and opposite in direction, and an externally generated magnetic field is zero.
According to the signal transmitting device for reducing the transient electromagnetic turn-off time, the transmitting loop is square or rectangular or circular or oval.
The beneficial effects of the utility model reside in that: the utility model discloses can show the turn-off time that reduces emission current, effectively measure early signal of saying, improve the SNR that the late period was said, realize transient electromagnetism shallow layer (closely) and deep (remote) geological information's effective extraction.
Drawings
Fig. 1 is a schematic structural diagram of the signal transmitting device of the present invention.
Fig. 2 is a schematic diagram of an equivalent circuit when transmitting an electromagnetic signal.
Fig. 3 is a schematic diagram of an equivalent circuit principle when the transmission signal is turned off.
Fig. 4 is a waveform diagram of a bipolar square wave current signal for transient electromagnetic emission.
Fig. 5 is a schematic circuit diagram of the case where a positive polarity current is output.
Fig. 6 is a waveform diagram of a key point when a positive polarity current is output.
Fig. 7 is a schematic circuit diagram when a negative polarity current is output.
Fig. 8 is a waveform diagram of a key point when a negative polarity current is output.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1, a signal transmitting device for reducing transient electromagnetic turn-off time includes a transmitting coil, an electronic switch i for controlling a connection mode of the transmitting coil, and an electronic switch ii for forming a bridge arm, where the transmitting coil is a twisted pair, the twisted pair includes a first wire and a second wire, the first wire is represented by a black solid line, the second wire is represented by a dotted line, the first wire is connected to one end of the electronic switch ii, the other end of the electronic switch ii is connected to one end of the electronic switch i, the other end of the electronic switch i is connected to the second wire, the connection mode of the two ends of the first wire and the second wire is controlled by the electronic switch i to be head-to-tail connection or head-to-tail connection, and the first wire and the second wire are connected to form a transmitting loop.
For convenience of description, the transmitting loop is square, rectangular, circular, oval, and may be formed into any other regular or irregular shape.
The electronic switch II comprises a first switch K1, a second switch K2, a third switch K3 and a fourth switch K4, one end of the first switch K1 and one end of the fourth switch K4 are connected together and then connected to the positive electrode of a power supply, the other end of the first switch K1 and one end of the second switch K2 are connected together and serve as an output electrode B of the electronic switch II to be connected to one end of the electronic switch I, the other end of the fourth switch K4 and one end of the third switch K3 are connected together and serve as an output electrode A of the electronic switch II to be connected to the head end (namely 1 end) of a first lead, and the other end of the second switch K2 and the other end of the third switch K3 are connected together and then grounded. When the electronic switch is designed by adopting the N-channel enhanced high-speed field effect transistor, each switch of the electronic switch II can be connected by the source electrodes of the two field effect transistors, and the drain electrodes are respectively used as two contacts of the switch to form an electronic switchOff when the gate-source voltage V of the two field effect transistorsGSWhen the voltage is high, the electronic switch is conducted, VGSWhen the voltage is low level, the electronic switch is cut off; each bridge arm switch of the electronic switch II consists of 1N-channel enhancement type field effect transistor, the drains of the first switch K1 and the fourth switch K4 are connected with the positive electrode of a power supply, the sources of the second switch K2 and the third switch K3 are grounded, when the grid source voltage is high level, the switches are switched on, and when the grid source voltage is low level, the switches are switched off.
The electronic switch I is a double-pole double-throw switch, the electronic switch I comprises an upper fixed contact and a lower fixed contact which are positioned in the middle, an upper movable contact I and a lower movable contact I which are positioned in the left side, and an upper movable contact II and a lower movable contact II which are positioned in the right side, the upper fixed contact is connected with an output electrode B of the electronic switch II, the lower fixed contact is connected with the tail end (namely 3 ends) of a first wire, the upper movable contact I and the lower movable contact II are both connected with the tail end (namely 4 ends) of a second wire, and the lower movable contact I and the upper movable contact II are both connected with the head end (namely 2 ends) of the second wire.
When the signal is transmitted, the second switch K2 and the fourth switch K4 in the electronic switch II are disconnected, the first switch K1 and the third switch K3 are switched on, and when a negative polarity current is output (A-, B +), or the first switch K1 and the third switch K3 in the electronic switch II are disconnected, the second switch K2 and the fourth switch K4 are switched on, and when a positive polarity current is output (A +, B-); meanwhile, the electronic switch I is arranged at the left end, the tail end of a first lead in a transmitting return wire formed by a twisted pair is connected with the head end of a second lead, the head end of the first lead is connected with an output electrode A of the electronic switch II, the tail end of the second lead is connected with an output electrode B of the electronic switch II, and magnetic fields generated by currents of the first lead and the second lead are equal in size and same in direction;
the electronic switch I is arranged at the left end, the tail end of a first wire in a transmitting return wire formed by the twisted pair is connected with the head end of a second wire, the head end of the first wire is connected with an output electrode A of the electronic switch II, the tail end of the second wire is connected with an output electrode B of the electronic switch II, and magnetic fields generated by currents of the first wire and the second wire are equal in size and same in direction. As shown in fig. 2, it can be easily seen that the antenna connection mode when transmitting signals is that two wires of the twisted pair are connected in series in the figure to generate magnetic field signals with equal magnitude and same polarity for superposition output.
When the signal transmission is stopped, a first switch K1 and a fourth switch K4 in an electronic switch II are disconnected, a second switch K2 and a third switch K3 are conducted and grounded, the electronic switch I is arranged at the right end, the tail end of a first wire in a transmission return wire formed by a twisted pair is connected with the tail end of a second wire, the head end of the first wire is connected with an output electrode A of the electronic switch II, the head end of the second wire is connected with an output electrode B of the electronic switch II, at the moment, a load output by the electronic switch II is changed into the twisted pair, the resistance is achieved, the inductance is zero, after the disconnection, if currents exist in the first wire and the second wire of the twisted pair, the currents are equal and opposite in direction, and the externally generated magnetic field is zero. As shown in fig. 3, it can be easily seen that the connection mode of the transmission loop when the current is turned off is that ends 1 and 2 of the twisted pair are respectively connected to the electronic switch ii A, B, the terminals are short-circuited ( ends 3 and 4 of the twisted pair are connected), the second switch K2 and the third switch K3 are in saturation conduction and grounded, the twisted pair load of the electronic switch ii is a pure resistive load, the turn-off time is mainly determined by the fall time of the switch circuit itself, and after the turn-off, even if the current exists in the twisted pair, the currents in the two wires are equal in magnitude and opposite in direction, and the magnetic field generated externally is zero.
A signal transmission method of a signal transmission apparatus for reducing a transient electromagnetic off-time, comprising the steps of:
the method comprises the following steps: judging whether a signal needs to be transmitted or a signal is turned off, if so, entering a step two, and if so, entering a step three;
step two: the electronic switch I is arranged at the left end, the tail end of a first lead in a transmitting return wire formed by a twisted pair is connected with the head end of a second lead, the head end of the first lead is connected with an output electrode A of the electronic switch II, the tail end of the second lead is connected with an output electrode B of the electronic switch II, and magnetic fields generated by currents of the first lead and the second lead are equal in size and same in direction;
step three: a first switch K1 and a fourth switch K4 in an electronic switch II are disconnected, a second switch K2 and a third switch K3 are conducted and grounded, meanwhile, the electronic switch I is arranged at the right end, the tail end of a first wire in a transmitting loop formed by a twisted pair is connected with the tail end of a second wire, the head end of the first wire is connected with an output electrode A of the electronic switch II, the head end of the second wire is connected with an output electrode B of the electronic switch II, at the moment, a load output by the electronic switch II is changed into the twisted pair, the resistance is achieved, the inductance is zero, after the electronic switch II is switched off, if currents exist in the first wire and the second wire of the twisted pair, the currents are equal in magnitude and opposite in direction, and a magnetic field generated externally is.
As shown in fig. 4, when the transient electromagnetic method is applied, the shorter the turn-off time is, the shallower the observation blind area is, the higher the signal-to-noise ratio of the collected signal is, and the smaller the influence on the measurement is.
FIG. 5 illustrates an embodiment of emitting a positive polarity current using an N-type enhancement mode high speed FET at V as the electronic switching device, such as a power switch of a GaN FET or a MOSFETGSSaturated conduction (switch closed) at high level, VGSAnd is turned off (the switch is turned off) when the voltage is low. When the signal is transmitted (A +, B-), namely V of field effect tubes K1 and K3GSAt high level, K1 and K3 are in saturated conduction, and the gate-source voltage V of K2 and K4GSWhen the voltage is low, the K2 and the K4 are disconnected, the current is output from the A pole, is input from the 1 end and output from the 3 end of 1 of the twisted pair, flows through the electronic switches K11 and K12 which are in saturation conduction, is input from the 2 end and output from the 4 end of the twisted pair, and returns to the B pole through the K31 and K32 which are in saturation conduction; when the current is turned off (V)A=0，VB= 0), K1, K4 are disconnected, K2, K3 are connected to ground, K11, K12, K31, K32 are disconnected, K41, K42, K21, K22 are connected, 3, 4 ends of the twisted pair are connected through the connected K41, K42, 2 ends of the twisted pair are connected with the B pole through the connected K21, K22, A, B is connected through the saturated connected K2, K3 and is connected with the power ground. In the figure, the drain electrode of each field effect tube is connected with the cathode of a surge absorption diode, the anode of the surge absorption diode is connected with the source electrode of the same field effect tube, and the minimum reverse breakdown voltage of the selected surge absorption diode is slightly lower than that of the field effect tubeThe drain-source breakdown voltage is used for protecting the field effect tube and improving the working reliability of the signal transmitting circuit.
Referring to FIG. 6 in conjunction with FIG. 5, when a positive polarity current is output (A +, B-), a current waveform I is outputA-BCorresponding to the section T1, VGS of the field effect transistors K1, K11, K12, K31, and K32 are all high level, the switching transistors are fully turned on, VGS =0 of the field effect transistors K2, K21, K22, K41, and K42 is high level, VGS of the K3 is high level, and VGS of the K4 is low level, at this time, the current output by the positive electrode (DC terminal) of the DC power supply passes through the K1 which is fully turned on to the point a, then passes through the L1 from the left end (1 end) of one wire L1 in the twisted pair to the right end (3 end) of the L1, then passes through the K11 and K12 which are fully turned on to the left end (2 end) of the other wire L2 in the twisted pair, then passes through the L2 to the right end (L4) of the L2, then passes through the K31 and K32 which are fully turned on to the point B, and then passes through the K3 which is fully turned; when the current is turned off, the output current waveform corresponds to IA-BCorresponding to the section T2, VGS =0 of the field effect transistors K1, K11, K12, K31, and K32, VGS of the field effect transistors K3, K21, K22, K41, and K42 are all high level, the switch transistors are fully turned on, VGS of the field effect transistor K2 is high level, VGS of the field effect transistor K4 is low level, at this time, the left end (1 end) of one wire L1 in the twisted pair is grounded through the electronic switch K2 that is in saturation conduction, the left end (2 end) of the other wire L2 in the twisted pair is grounded through the electronic switches K21 and K22 that are in saturation conduction and then through the electronic switch K3 that is in saturation conduction, and the right end (4 end) of the wire L2 is shorted with the right end (3 end) of the wire L1 in the twisted pair through the electronic switches K41 and K42 that are in saturation conduction.
FIG. 7 shows an embodiment of emitting negative polarity current, in which an N-type enhancement mode high speed FET is used as an electronic switching device, such as a power switch of GaN FET or MOSFET, with the FET being at VGSSaturated conduction (switch closed) at high level, VGSAnd is turned off (the switch is turned off) when the voltage is low. When emitting signals (A-, B +), i.e. V of FETs K2, K4GSAt high level, K2 and K4 are in saturated conduction, and the gate-source voltage V of K1 and K3GSAt low level, K1 and K3 are turned off, and K11, K12, K31 and K32 are turned on in saturation (V)GSHigh level), K41, K42, K21 and K22 are cut off (V)GS=0，），The current is from the positive pole (DC end) of the direct current power supply to the point B through the saturated conducting switch K4, then the B pole outputs the saturated conducting electronic switches K31 and K32 to be connected with the right end (4 end) of the L2 in the twisted pair, the left end (2 end) of the L2 is connected with the right end (3 end) of the other L1 in the twisted pair through the saturated conducting K11 and K12, and the left end (1 end) of the L1 is connected with the power ground through the saturated conducting electronic switch K2; v of K1, K4 when emission current is turned offGSAt low level, K1 and K4 are off, and V of K2 and K3 are offGSAt high level, K2 and K3 are grounded and V isA=0，VB=0, K11, K12, K31, K32 cut off (V)GS= 0), K41, K42, K21, and K22 are in saturated conduction (V)GSHigh level), the 3 and 4 ends of the right end of the twisted pair are short-circuited through K41 and K42 which are in saturation conduction, the 2 end of the twisted pair is connected with the B pole through K21 and K22 which are in conduction, and A, B is connected with the ground through K2 and K3 which are in saturation conduction. In the figure, the drain electrode of each field effect tube is connected with the cathode of a surge absorption diode, the anode of the surge absorption diode is connected with the source electrode of the same field effect tube, and the minimum reverse breakdown voltage of the surge absorption diode is selected to be slightly lower than the drain-source breakdown voltage of the field effect tube, so that the field effect tubes are protected, and the working reliability of the signal transmitting circuit is improved.
Referring to FIG. 8 in conjunction with FIG. 7, when a negative polarity current is output (A-, B +), a current waveform I is outputA-BCorresponding to the section T3, the field effect transistors K4, K11, K12, K31, and K32 are in saturated conduction (VGS is high level), the field effect transistors K3, K21, K22, K41, and K42 are off (VGS = 0), the VGS of K2 is high level, K2 is on, the VGS of K1 is low level, and K1 is off, at this time, the current output by the positive pole (DC end) of the DC power supply passes through the K4 in saturated conduction to the point B, then the K31 and K32 in saturated conduction are connected to the right end (4 end) of the L2 in the twisted pair, then the left end (2 end) of the L2 in the twisted pair is connected to the right end (3 end) of the L1 in the twisted pair through the switches K11 and K12 in saturated conduction, the left end (1 end) of the L1 is grounded through the K2 in saturated conduction, and the currents in two wires in the same direction are superimposed and output magnetic fields. When the current is turned off, the output current waveform corresponds to IA-BCorresponding to T4 stage, field effect transistors K4, K11, K12 and K31VGS =0 of the K32, the field effect transistors K3, K21, K22, K41, and K42 are in saturation conduction (VGS is all at a high level), K2 is in saturation conduction (VGS is at a high level), and K1 is turned off (VGS = 0), at this time, the left end (1 end) of one wire L1 in the twisted pair is grounded through the electronic switch K2 in saturation conduction, the left end (2 end) of the other wire L2 in the twisted pair is grounded through the electronic switches K21 and K22 in saturation conduction and then through the electronic switch K3 in saturation conduction, and the right end (4 end) of the wire L2 is shorted with the right end (3 end) of the wire L1 in the twisted pair through the electronic switches K41 and K42 in saturation conduction.
The embodiment of the utility model is introduced by using the most widely used bipolar square wave emission, and is also applicable when bipolar rectangular waves or combined rectangular waves are adopted for emission; when single-polarity square waves, rectangular waves or combined rectangular waves are adopted for signal transmission, the utility model is also applicable.
The utility model discloses not only be applicable to the transmission of transient electromagnetic signal, also be applicable to the situation that adopts other artifical source electromagnetic method exploration signal transmission of magnetic source transmission.
Adopt when small-size transmission wire frame transmission signal, can put into high magnetic conductivity's soft magnetic material in the wire frame, reach and reduce the transmitting antenna size, compromise the purpose of signal transmission intensity and portability, consequently the utility model relates to a put into the situation that high magnetic conductivity soft magnetic material is used for magnetic field transmission in the wire frame equally the utility model discloses a protection scope and so on.
Claims (6)
1. A signal transmitting device for reducing transient electromagnetic off-times, comprising: the transmission coil is a twisted pair, the twisted pair comprises a first wire and a second wire, the first wire is connected with one end of the electronic switch I, the other end of the electronic switch II is connected with one end of the electronic switch I, the other end of the electronic switch I is connected with the second wire, the connection modes of the first wire and the second wire are controlled to be head-to-head connection, tail-to-tail connection or head-to-tail connection through the electronic switch I, and the first wire and the second wire form a transmission loop after being connected.
2. A signal transmission device for reducing transient electromagnetic off-times as claimed in claim 1, wherein: the electronic switch II comprises a first switch, a second switch, a third switch and a fourth switch, one end of the first switch and one end of the fourth switch are connected together and then connected to the positive electrode of a power supply, the other end of the first switch and one end of the second switch are connected together and then connected to one end of the electronic switch I as an output electrode B of the electronic switch II, the other end of the fourth switch and one end of the third switch are connected together and then connected to the head end of the first lead as an output electrode A of the electronic switch II, and the other end of the second switch and the other end of the third switch are connected together and then grounded.
3. A signal transmission device for reducing transient electromagnetic off-times as claimed in claim 2, wherein: the electronic switch I is a double-pole double-throw switch, the electronic switch I comprises an upper fixed contact and a lower fixed contact which are located in the middle, an upper movable contact I and a lower movable contact I which are located in the left side, and an upper movable contact II and a lower movable contact II which are located in the right side, the upper fixed contact is connected with an output electrode B of the electronic switch II, the lower fixed contact is connected with the tail end of a first wire, the upper movable contact I and the lower movable contact II are both connected with the tail end of a second wire, and the lower movable contact I and the upper movable contact II are both connected with the head end of the second wire.
4. A signal transmission device for reducing transient electromagnetic off-times as claimed in claim 3, wherein: when a signal is transmitted, the electronic switch I is arranged at the left end, the tail end of a first wire in a transmitting return wire formed by the twisted pair is connected with the head end of a second wire, the head end of the first wire is connected with an output electrode A of the electronic switch II, the tail end of the second wire is connected with an output electrode B of the electronic switch II, and magnetic fields generated by currents of the first wire and the second wire are equal in size and same in direction.
5. A signal transmission device for reducing transient electromagnetic off-times as claimed in claim 3, wherein: when the transmission of signals is stopped, a first switch and a fourth switch in an electronic switch II are disconnected, a second switch and a third switch are conducted and grounded, an electronic switch I is arranged at the right end, the tail end of a first wire in a transmission loop formed by a twisted pair is connected with the tail end of a second wire, the head end of the first wire is connected with an output electrode A of the electronic switch II, the head end of the second wire is connected with an output electrode B of the electronic switch II, at the moment, a load output by the electronic switch II becomes the twisted pair and is resistive, the inductance is zero, after the electronic switch II is switched off, if currents exist in the first wire and the second wire of the twisted pair, the currents are equal in magnitude and opposite in direction, and the externally generated magnetic field is zero.
6. A signal transmission device for reducing transient electromagnetic off-times as claimed in claim 1, wherein: the sending loop is square or rectangular or circular or oval.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111313916A (en) * | 2020-03-31 | 2020-06-19 | 湖南科技大学 | Signal transmitting device and method for reducing transient electromagnetic turn-off time |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111313916A (en) * | 2020-03-31 | 2020-06-19 | 湖南科技大学 | Signal transmitting device and method for reducing transient electromagnetic turn-off time |
| CN111313916B (en) * | 2020-03-31 | 2024-03-08 | 湖南科技大学 | Signal transmitting device and method for reducing transient electromagnetic turn-off time |
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