CN207440309U - A kind of receiving coil damping resistance automatic matching device - Google Patents
A kind of receiving coil damping resistance automatic matching device Download PDFInfo
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- CN207440309U CN207440309U CN201721384464.2U CN201721384464U CN207440309U CN 207440309 U CN207440309 U CN 207440309U CN 201721384464 U CN201721384464 U CN 201721384464U CN 207440309 U CN207440309 U CN 207440309U
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Abstract
The utility model discloses a kind of receiving coil damping resistance automatic matching devices, including the first signal processing circuit, secondary signal process circuit, 3rd signal processing circuit, fourth signal process circuit, first match circuit, second match circuit, 3rd match circuit and the 4th match circuit, first signal processing circuit, secondary signal process circuit, the input terminal of 3rd signal processing circuit and fourth signal process circuit is connected to electric signal input end, first signal processing circuit, secondary signal process circuit, first output terminal of the 3rd signal processing circuit and fourth signal process circuit is connected to one end of the first current-limiting resistance, and it is connected to the first electrical signal, the utility model can meet the arbitrary matching of the damping resistance of the receiving coil to the different numbers of turn.
Description
Technical field
The utility model is related to transient electromagnetic detecting technical field more particularly to a kind of automatic of receiving coil damping resistances
With device.
Background technology
Transient electromagnetic method is one of important methods of information such as Underground medium electrical parameter, and transient electromagnetic method is typically
Primary field is established in underground using the pulse current of constant amplitude, pulse current periodically turns off, and detection geologic body generates
Secondary magnetic field by analyzing and handling secondary magnetic field data, determines subsurface geologic structures.Frequently with transient electrical in transient electromagnetic method
Magnetic reception device receives electromagnetic signal, and transient electromagnetic reception device receives electromagnetic signal by receiving coil, to carry out geology
The detection of body.By increasing the number of turn of receiving coil, capture area can be improved, the reception of transient electromagnetic reception device can be increased
The sensitivity of signal.But since the receiving coil number of turn increases, receiving coil self-induction and intrinsic distribution capacity significantly increase,
Two Jie's characteristics of its equivalent circuit be can not ignore, it is necessary in receiving coil both ends parallel connection damping resistance to eliminate output voltage waveforms
Vibration.
The prior art carries out the matching of damping resistance only for a certain specific single turn receiving coil, when change receiving coil
During the number of turn, it is necessary to while change the size of damping resistance, to match the receiving coil of the current number of turn, to eliminate output voltage waveforms
Vibration, when matching damping resistance, replacement damping resistance is relatively complicated, increases workload, reduces work efficiency, in the prior art
Damping resistance matching scheme be only satisfied with to the matching of the damping resistance of specific single turn receiving coil, when receiving line using multiturn
During circle, the arbitrary matching of the damping resistance of receiving coil to the different numbers of turn can not be met.
Therefore, there is an urgent need for invent a kind of Auto-matching of the small receiving coil damping resistance suitable for transient electromagnetic method detection
Device.
Utility model content
This application provides a kind of receiving coil damping resistance automatic matching device, to meet the reception line to the different numbers of turn
The arbitrary matching of the damping resistance of circle.
In order to solve the above-mentioned technical problem, the use of the new type embodiment discloses following technical solution：A kind of receiving coil
Damping resistance automatic matching device, including the first signal processing circuit, secondary signal process circuit, the 3rd signal processing circuit,
Fourth signal process circuit, the first match circuit, the second match circuit, the 3rd match circuit and the 4th match circuit, wherein,
First signal processing circuit, secondary signal process circuit, the 3rd signal processing circuit and fourth signal processing
The input terminal of circuit is connected to electric signal input end, first signal processing circuit, secondary signal process circuit, the 3rd letter
First output terminal of number process circuit and fourth signal process circuit is connected to one end of the first current-limiting resistance and is connected to
One electrical signal；
First signal processing circuit, secondary signal process circuit, the 3rd signal processing circuit and fourth signal processing
The second output terminal of circuit is electric with the first field-effect tube, the second field-effect tube, the 3rd field-effect tube and the 4th field-effect tube respectively
Property connection；
First signal processing circuit, secondary signal process circuit, the 3rd signal processing circuit and fourth signal processing
3rd output terminal of circuit matches electricity with first match circuit, the second match circuit, the 3rd match circuit and the 4th respectively
The bidirectional triode thyristor on road is electrically connected.
First match circuit, the second match circuit, the input terminal of the 3rd match circuit and the 4th match circuit connect
It is connected to the other end of first current-limiting resistance, first match circuit, the second match circuit, the 3rd match circuit and the 4th
The output terminal of match circuit is connected to the second electrical signal.
Preferably, first signal processing circuit, secondary signal process circuit, the 3rd signal processing circuit and the 4th letter
Current-limiting resistance is equipped on number input terminal of process circuit and the connection busbar of electric signal input end.
Preferably, first signal processing circuit, secondary signal process circuit, the 3rd signal processing circuit and the 4th letter
Number process circuit includes key light electric isolator and secondary photoisolator, and the input terminal of the key light electric isolator is respectively described
First signal processing circuit, secondary signal process circuit, the input terminal of the 3rd signal processing circuit and fourth signal process circuit,
First output terminal of the key light electric isolator is respectively first signal processing circuit, secondary signal process circuit, the 3rd
First output terminal of signal processing circuit and fourth signal process circuit, other two output terminal of the key light electric isolator with
Two input terminals of the pair photoisolator are electrically connected, and the first output terminal of the pair photoisolator is respectively described the
Second output of one signal processing circuit, secondary signal process circuit, the 3rd signal processing circuit and fourth signal process circuit
End, the second output terminal of the pair photoisolator is respectively first signal processing circuit, secondary signal process circuit, the
3rd output terminal of three signal processing circuits and fourth signal process circuit.
Preferably, one of electric connection busbar of the key light electric isolator and secondary photoisolator is equipped with current limliting
Resistance.
Preferably, first match circuit, the second match circuit, the 3rd match circuit and the 4th match circuit include
Build-out resistor, filter capacitor, bidirectional triode thyristor and current-limiting resistance, the bidirectional triode thyristor and the filter capacitor and current-limiting resistance
The one end of the input terminal of the series circuit parallel connection of composition, the bidirectional triode thyristor and filter capacitor with the build-out resistor is electrically connected
It connects, the other end of the build-out resistor is respectively first match circuit, the second match circuit, the 3rd match circuit and the 4th
The input terminal of match circuit.
Preferably, one end of first field-effect tube, the second field-effect tube, the 3rd field-effect tube and the 4th field-effect tube
It is grounded.
Preferably, first signal processing circuit, secondary signal process circuit, the 3rd signal processing circuit and the 4th letter
The resistance value of the input terminal of number process circuit and the current-limiting resistance on the connection busbar of electric signal input end is 620 Ω.
Preferably, the resistance of the current-limiting resistance and the first current-limiting resistance between the key light electric isolator and secondary photoisolator
It is worth for 360 Ω.
As seen from the above technical solution, the receiving coil damping resistance Auto-matching dress that the utility model embodiment provides
It puts, when not having input signal, key light electric isolator and secondary photoisolator are not turned on, so bidirectional triode thyristor is not led
Logical, circuit is turned on by the parallel branch of match circuit, and the matched resistance of electric current, filter capacitor and current-limiting resistance flow to the second electricity
Signal output part.And when one of signal arrives, key light electric isolator and secondary photoisolator turn on, and signal processing circuit is led
Lead to corresponding bidirectional triode thyristor pulse signal, corresponding build-out resistor is accessed circuit by corresponding bidirectional triode thyristor conducting.Example
Such as, when the key light electric isolator of the first signal processing circuit and secondary photoisolator start, secondary photoisolator is to corresponding
Bidirectional triode thyristor pulse signal, bidirectional triode thyristor conducting, so as to which corresponding build-out resistor accesses circuit without filter capacitor circuit,
Realize the access of build-out resistor.If the first match circuit, the second match circuit, the 3rd match circuit and the 4th match circuit
Build-out resistor select 1 times of resistance value, 2 times of resistance values, 4 times of resistance values, 8 times of resistance values respectively, then the build-out resistor of circuit can be realized from 1
Times resistance value is to the consecutive variations of 15 times of resistance values.
Description of the drawings
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of circuit signal for receiving coil damping resistance automatic matching device that the utility model embodiment provides
Figure；
Fig. 2 is a kind of receiving coil for receiving coil damping resistance automatic matching device that the utility model embodiment provides
Equivalent circuit diagram；
Fig. 3 is the coil turn-to-turn parasitic capacitance equivalent network figure of receiving coil.
Specific embodiment
In order to which those skilled in the art is made to more fully understand the technical solution in the utility model, below in conjunction with this reality
With the attached drawing in new embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that
The described embodiments are only a part of the embodiments of the utility model, instead of all the embodiments.Based on the utility model
In embodiment, the every other implementation that those of ordinary skill in the art are obtained without making creative work
Example should all belong to the scope of the utility model protection.
Referring to Fig. 1, Fig. 1 is a kind of receiving coil damping resistance automatic matching device that the utility model embodiment provides
Circuit diagram, to solve the problems, such as the arbitrary matching of the damping resistance of the receiving coil to the different numbers of turn, the utility model carries
Go out a kind of receiving coil damping resistance automatic matching device, the first signal processing circuit 110, secondary signal process circuit 111,
The input terminal of three signal processing circuits 112 and fourth signal process circuit 113 is connected to electric signal input end, at the first signal
Manage the first of circuit 110, secondary signal process circuit 111, the 3rd signal processing circuit 112 and fourth signal process circuit 113
Output terminal is connected to one end of the first current-limiting resistance R309 and is connected to the first electrical signal, the first current-limiting resistance
The resistance value of R309 is 360 Ω；
First signal processing circuit 110, secondary signal process circuit 111, the 3rd signal processing circuit 112 and fourth signal
The second output terminal of process circuit 113 respectively with the first field-effect tube U312, the second field-effect tube U313, the 3rd field-effect tube
U314 and the 4th field-effect tube U315 is electrically connected, the model FDS6688 of field-effect tube, the first field-effect tube U312, second
One end of field-effect tube U313, the 3rd field-effect tube U314 and the 4th field-effect tube U315 are grounded.
First signal processing circuit 110, secondary signal process circuit 111, the 3rd signal processing circuit 112 and fourth signal
3rd output terminal of process circuit 113 respectively with the first match circuit 120, the second match circuit 121, the 3rd match circuit 122
Be electrically connected with the bidirectional triode thyristor of the 4th match circuit 123, when signal access port input electrical signal, key light electric isolator and
Secondary photoisolator conducting, signal processing circuit are turned on to corresponding bidirectional triode thyristor pulse signal, corresponding bidirectional triode thyristor
Conducting, so as to which corresponding build-out resistor is accessed circuit.
First match circuit 120, the second match circuit 121, the 3rd match circuit 122 and the 4th match circuit 123 it is defeated
Enter the other end that end is connected to the first current-limiting resistance R309, the first match circuit 120, the matching of the second match circuit the 121, the 3rd
The output terminal of 122 and the 4th match circuit 123 of circuit is connected to the second electrical signal.
As a kind of preferred embodiment of the technical program, the first signal processing circuit 110, secondary signal process circuit
111st, the connection busbar of the input terminal and electric signal input end of the 3rd signal processing circuit 112 and fourth signal process circuit 113
On be equipped with current-limiting resistance, and the resistance value of above-mentioned current-limiting resistance is 620 Ω, and current-limiting resistance plays the role of current limliting, prevents electricity
Flow through big, above-mentioned current-limiting resistance and the first signal processing circuit 110, secondary signal process circuit 111, the 3rd signal processing circuit
112 and fourth signal process circuit 113 it is corresponding be respectively the second current-limiting resistance R318, the 3rd current-limiting resistance R320, the 4th
Current-limiting resistance R322 and the 5th current-limiting resistance R324.
As a kind of preferred embodiment of the technical program, the first signal processing circuit 110, secondary signal process circuit
111st, the 3rd signal processing circuit 112 and fourth signal process circuit 113 include key light electric isolator and secondary photoisolator,
The input terminal of key light electric isolator is respectively first signal processing circuit 110, the letter of secondary signal process circuit the 111, the 3rd
The input terminal of number process circuit 112 and fourth signal process circuit 113, the first output terminal of key light electric isolator is respectively described
First signal processing circuit 110, secondary signal process circuit 111, the 3rd signal processing circuit 112 and fourth signal process circuit
113 the first output terminal, other two output terminal of key light electric isolator and two input terminals of secondary photoisolator electrically connect
It connects, the first output terminal of the pair photoisolator is respectively first signal processing circuit 110, secondary signal process circuit
111st, the 3rd signal processing circuit 112 and the second output terminal of fourth signal process circuit 113, the second of secondary photoisolator are defeated
Outlet is respectively the first signal processing circuit 110, secondary signal process circuit 111, the 3rd signal processing circuit 112 and the 4th letter
3rd output terminal of number process circuit 113, the second output terminal of secondary photoisolator are electrically connected with corresponding bidirectional triode thyristor, main
The model of photoisolator and secondary photoisolator is MOC3081, key light electric isolator and secondary photoisolator and the first letter
Number process circuit 110,113 phase of secondary signal process circuit 111, the 3rd signal processing circuit 112 and fourth signal process circuit
It is corresponding be respectively divided into the first key light electric isolator U304, the second key light electric isolator U306, the 3rd key light electric isolator U308,
The secondary photoisolator U305 of 4th key light electric isolator U310 and first, the second secondary photoisolator U307, the 3rd secondary photoelectricity every
From device U309 and fourth officer photoisolator U311.
As a kind of preferred embodiment of the technical program, one of electricity of key light electric isolator and secondary photoisolator
Property connection busbar be equipped with current-limiting resistance, above-mentioned current-limiting resistance and the first signal processing circuit 110, secondary signal process circuit
111st, the 3rd signal processing circuit 112 and fourth signal process circuit 113 it is corresponding be respectively the 6th current-limiting resistance R319, the
Seven current-limiting resistance R321, the 8th current-limiting resistance R323 and the 9th current-limiting resistance R325, above-mentioned current-limiting resistance play metering function, prevent
Only the turning circuit of key light electric isolator and secondary photoisolator, which powers on, flows through greatly, plays the role of protection.
As another preferred embodiment of the technical program, the first match circuit 120, the second match circuit the 121, the 3rd
122 and the 4th match circuit 123 of match circuit includes build-out resistor, filter capacitor, bidirectional triode thyristor and current-limiting resistance, two-way
It is silicon-controlled with filter capacitor and series circuit that current-limiting resistance forms is in parallel, the input terminal of bidirectional triode thyristor and filter capacitor with
One end electrical connection of the build-out resistor, the model BTA41-1200B of bidirectional triode thyristor, the other end of build-out resistor are respectively
First match circuit 120, the second match circuit 121, the input terminal of the 3rd match circuit 122 and the 4th match circuit 123,
The other end with resistance is connected with the other end of the first current-limiting resistance R309, bidirectional triode thyristor and the first match circuit 120, second
Match circuit 121, the 3rd match circuit 122 and the 4th match circuit 123 is corresponding is respectively divided into the first bidirectional triode thyristor
Q301, the second bidirectional triode thyristor Q302, the 3rd bidirectional triode thyristor Q303 and the 4th bidirectional triode thyristor Q304, build-out resistor and first
Match circuit 120, the second match circuit 121, the 3rd match circuit 122 and the 4th match circuit 123 is corresponding is respectively divided into
First build-out resistor R310, the second build-out resistor R311, the 3rd build-out resistor R312 and the 4th build-out resistor R313, filter capacitor
With 123 corresponding points of the first match circuit 120, the second match circuit 121, the 3rd match circuit 122 and the 4th match circuit
It Wei not the first filter capacitor C314, the second filter capacitor C315, the 3rd filter capacitor C316 and the 4th filter capacitor C317.
Referring to Fig. 2, Fig. 2 is a kind of receiving coil damping resistance automatic matching device that the utility model embodiment provides
Receiving coil equivalent circuit diagram, v (t) are the induced electromotive force of receiving coil, i.e., pure secondary field induced voltage, L is receiving coil
Equivalent inductance, R is the internal resistance of receiving coil, and C is the distribution capacity of receiving coil, and R0 is and in the damping at receiving coil both ends
Resistance, u (t) are the voltage signal of acquisition system actual samples.The induced electromotive force v that receiving coil receives due to electromagnetic induction
(t) it is theoretic transient electromagnetic induced voltage signal, and the voltage signal that acquisition system samples in real work is u (t), two
Person is not same signal, only just tends to overlap in signal late period, v (t) and u (t), second-order circuit, and transmission function isDerivation is as follows：
By Laplace transform, can be reduced to,
In formula (1),
ω in formula (1) and (3)p, ω0The respectively resonant frequency and natural resonance frequency of receiving coil, definition damping system
Number,
Under conditions of critical damping ζ=1, can solve critical damping resistance is
The calculating of coil resistance R in formula (5),
ρ is winding wire resistivity in formula (6), and L is conductor length, and S is sectional area of wire.
The acquisition of inductance L in formula (5), using formula：
In formula (7), d is coil diameter, and φ is the amount changed with ratio beta,(l is the length of coil),
The acquisition of distribution capacity C in formula (5), the finite element software Ansoft based on Maxwell's differential equation
Maxwell, symmetrical 2-D electrostatic fields solver quickly simulation calculation can go out coil turn-to-turn parasitic capacitance, be referring to Fig. 3, Fig. 3
The coil turn-to-turn parasitic capacitance equivalent network figure of receiving coil, an one circle coil of node on behalf, the capacitance between node is circle
Between parasitic capacitance.After obtaining Fig. 3 coil turn-to-turn parasitic capacitances with Maxwell FEM bags, node is eliminated using matrix operation and is obtained
To C1NValue is the equivalent entrance capacitance value in coil both ends.
Its distribution capacity can be emulated in advance for different receiving coils, and by result storage using as tabling look-up
Data source is obtained, receiving coil effective area is fixed as 128m2Different size receiving coil parametric results it is as shown in the table：
| N | 2 | 4 | 8 | 16 | 24 | 32 | 48 | 64 |
| r/m | 4.515 | 3.192 | 2.257 | 1.596 | 1.303 | 1.129 | 0.922 | 0.798 |
| R/Ω | 0.493 | 0.697 | 0.985 | 1.393 | 1.706 | 1.971 | 2.414 | 2.786 |
| L/mH | 0.197 | 0.495 | 1.211 | 2.893 | 4.740 | 6.676 | 10.645 | 14.611 |
| C/pF | 3822.7 | 992.2 | 346.787 | 140.572 | 86.913 | 62.531 | 40.138 | 29.410 |
To sum up, can critical damping electricity be calculated by formula (5) according to the coil resistance R, inductance L and distribution capacity C calculated
Hinder R0, according to critical damping resistance R0Resistance value, corresponding bidirectional triode thyristor is turned on, completes the matching of damping resistance.
Claims (8)
1. a kind of receiving coil damping resistance automatic matching device, which is characterized in that including the first signal processing circuit (110),
Secondary signal process circuit (111), the 3rd signal processing circuit (112), fourth signal process circuit (113), the first matching electricity
Road (120), the second match circuit (121), the 3rd match circuit (122) and the 4th match circuit (123), wherein,
First signal processing circuit (110), secondary signal process circuit (111), the 3rd signal processing circuit (112) and
The input terminal of four signal processing circuits (113) is connected to electric signal input end, first signal processing circuit (110),
First output terminal of binary signal process circuit (111), the 3rd signal processing circuit (112) and fourth signal process circuit (113)
It is connected to one end of the first current-limiting resistance (R309) and is connected to the first electrical signal；
First signal processing circuit (110), secondary signal process circuit (111), the 3rd signal processing circuit (112) and
The second output terminal of four signal processing circuits (113) respectively with the first field-effect tube (U312), the second field-effect tube (U313),
Three field-effect tube (U314) and the 4th field-effect tube (U315) are electrically connected；
First signal processing circuit (110), secondary signal process circuit (111), the 3rd signal processing circuit (112) and
3rd output terminal of four signal processing circuits (113) respectively with first match circuit (120), the second match circuit (121),
The bidirectional triode thyristor of 3rd match circuit (122) and the 4th match circuit (123) is electrically connected；
First match circuit (120), the second match circuit (121), the 3rd match circuit (122) and the 4th match circuit
(123) input terminal is connected to the other end of first current-limiting resistance (R309), first match circuit (120),
The output terminal of two match circuits (121), the 3rd match circuit (122) and the 4th match circuit (123) is connected to the second telecommunications
Number output terminal.
2. receiving coil damping resistance automatic matching device according to claim 1, which is characterized in that first signal
Process circuit (110), secondary signal process circuit (111), the 3rd signal processing circuit (112) and fourth signal process circuit
(113) current-limiting resistance is equipped on input terminal and the connection busbar of electric signal input end.
3. receiving coil damping resistance automatic matching device according to claim 1, which is characterized in that first signal
Process circuit (110), secondary signal process circuit (111), the 3rd signal processing circuit (112) and fourth signal process circuit
(113) key light electric isolator and secondary photoisolator are included, the input terminal of the key light electric isolator is respectively described first
Signal processing circuit (110), secondary signal process circuit (111), the 3rd signal processing circuit (112) and fourth signal processing electricity
The input terminal on road (113), the first output terminal of the key light electric isolator be respectively first signal processing circuit (110),
First output of secondary signal process circuit (111), the 3rd signal processing circuit (112) and fourth signal process circuit (113)
End, other two output terminal of the key light electric isolator and two input terminals of the secondary photoisolator are electrically connected, institute
The first output terminal for stating secondary photoisolator is respectively first signal processing circuit (110), secondary signal process circuit
(111), the 3rd signal processing circuit (112) and the second output terminal of fourth signal process circuit (113), the pair Phototube Coupling
The second output terminal of device is respectively first signal processing circuit (110), secondary signal process circuit (111), the 3rd signal
3rd output terminal of process circuit (112) and fourth signal process circuit (113).
4. receiving coil damping resistance automatic matching device according to claim 3, which is characterized in that the key light electricity every
One of electric connection busbar from device and secondary photoisolator is equipped with current-limiting resistance.
5. receiving coil damping resistance automatic matching device according to claim 1, which is characterized in that first matching
Circuit (120), the second match circuit (121), the 3rd match circuit (122) and the 4th match circuit (123) include matching electricity
Resistance, filter capacitor, bidirectional triode thyristor and current-limiting resistance, the bidirectional triode thyristor are formed with the filter capacitor and current-limiting resistance
The one end of the input terminal of series circuit parallel connection, the bidirectional triode thyristor and filter capacitor with the build-out resistor is electrically connected, institute
The other end for stating build-out resistor is respectively first match circuit (120), the second match circuit (121), the 3rd match circuit
(122) and the input terminal of the 4th match circuit (123).
6. receiving coil damping resistance automatic matching device according to claim 1, which is characterized in that first effect
One end that (U312), the second field-effect tube (U313), the 3rd field-effect tube (U314) and the 4th field-effect tube (U315) should be managed is equal
Ground connection.
7. receiving coil damping resistance automatic matching device according to claim 3, which is characterized in that first signal
Process circuit (110), secondary signal process circuit (111), the 3rd signal processing circuit (112) and fourth signal process circuit
(113) resistance value of input terminal and the current-limiting resistance on the connection busbar of electric signal input end is 620 Ω.
8. receiving coil damping resistance automatic matching device according to claim 4, which is characterized in that the key light electricity every
It is 360 Ω from the current-limiting resistance between device and secondary photoisolator and the resistance value of the first current-limiting resistance (R309).
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| CN201721384464.2U CN207440309U (en) | 2017-10-25 | 2017-10-25 | A kind of receiving coil damping resistance automatic matching device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20230069682A1 (en) * | 2021-08-30 | 2023-03-02 | Guoqiang Xue | Adaptive damping magnetic field sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20230069682A1 (en) * | 2021-08-30 | 2023-03-02 | Guoqiang Xue | Adaptive damping magnetic field sensor |
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