CN110344814A - A kind of logging instrument front-end circuit - Google Patents
A kind of logging instrument front-end circuit Download PDFInfo
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- CN110344814A CN110344814A CN201910635288.2A CN201910635288A CN110344814A CN 110344814 A CN110344814 A CN 110344814A CN 201910635288 A CN201910635288 A CN 201910635288A CN 110344814 A CN110344814 A CN 110344814A
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- 230000009466 transformation Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 239000003985 ceramic capacitor Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The present invention provides a kind of logging instrument front-end circuit, is made of distal power amplifier, step-up transformer and voltage-multiplying circuit, preamplifier three parts；Distal power amplifier, according to the external power drive signal for controlling output certain frequency and amplitude；Step-up transformer and voltage-multiplying circuit generate the suitable high pressure of logging instrument nuclear detector under the control of the power drive signal；Preamplifier to the output signal shaping of nuclear detector, is amplified to suitable curring time and amplitude.Due to that can eliminate the noise of controllable high-voltage generator significantly, controllable high-voltage generator and preamplifier two parts may be mounted at does not need any metallic shield together, meets the requirement of logging instrument miniaturization.
Description
Technical field
The present invention relates to a kind of front-end circuits of logging instrument, and in particular to a kind of logging instrument front-end circuit.
Background technique
Currently, due to the miniaturization and complication of tool configuration, so that the nuclear detector of logging instrument and its front-end circuit
The space that can be installed is smaller and smaller.Nuclear detector front-end circuit is by controllable high-voltage generator and preamplifier two parts group
At being made of inside controllable high-voltage generator pwm circuit, step-up transformer and rectification circuit etc., belong to high voltage-small current and open
Powered-down source, due to Switching Power Supply work when can generate certain noise, cannot be directly mounted together with preamplifier,
The metallic shield quarantine measures that must be used between preamplifier, can not thus design occupied space it is very small before
The performance boost of terminal circuit, logging instrument is affected.
Summary of the invention
In view of this, the present invention devises a kind of logging instrument front-end circuit, due to that can eliminate controllable high-voltage significantly
The noise of device, therefore controllable high-voltage generator and preamplifier two parts may be mounted at and not need any metal screen together
It covers, meets the requirement of logging instrument miniaturization.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of logging instrument front-end circuit, by distal power amplifier, step-up transformer and voltage-multiplying circuit, preamplifier
Three parts composition；
Distal power amplifier, according to the external power drive signal for controlling output certain frequency and amplitude；
Step-up transformer and voltage-multiplying circuit generate logging instrument nuclear detector and are suitble under the control of the power drive signal
High pressure；
Preamplifier to the output signal shaping of nuclear detector, is amplified to suitable curring time and amplitude.
Further, the input terminal of distal power amplifier of the present invention is separately connected the I/O port and ADC of CPU, defeated
For the frequency of power drive signal by the control of the I/O port output signal of CPU, the amplitude of output power driving signal is defeated by ADC out
The control of signal out.
Further, distal power amplifier of the present invention, by capacitor C11~C13, resistance R2~R6, R8~R11,
R15, triode Q1, Q2, Q3, amplifier U1 composition；
The I/O port of CPU is sequentially connected in series the negative input end after resistance R11, resistance R8, capacitor C11 and resistance R15 with amplifier U1
Connection, the positive input terminal of amplifier U1 are grounded by resistance R2；ADC series resistance R9 is followed by the base stage of triode Q3, triode Q3
Emitter be grounded by resistance R10, the collector of triode Q3 is connected between resistance R8 and capacitor C11；Resistance R6 and electricity
After holding C12 series connection, it is then parallelly connected between the negative input end and output end of amplifier U1；Divide after the output end series resistance R3 of amplifier U1
The base stage of other connecting triode Q1 and the base stage of Q2, the collector of triode Q1 connect positive voltage, and the emitter of Q2 meets negative voltage, Q1
Emitter connect the collector of Q2 as high-voltage driven signal output end, high-voltage driven signal output end pass sequentially through resistance R4 and
R5 ground connection, and be connected between resistance R4 and R5 with the negative input end of amplifier U1.
Further, the range of positive voltage of the present invention is+5V~+24V, and the range of negative voltage is -5V~-24V,
R11 selects 1K~10K, C13 to select 100pF~10nF.
Further, step-up transformer and voltage-multiplying circuit of the present invention, by capacitor C1~C9, diode D1~D8,
Resistance R1, transformer T1 composition；
One end of the winding A of transformer T1 is grounded, another termination driving signal input of winding A, the winding B of transformer T1
One termination C1 one end, winding B the other end ground connection, anode, the cathode of D2 and one end of C3 of another termination D1 of C1, C3
Other end connection D3 anode, the cathode of D4 and one end of C5, the other end connection anode of D5 of C5, the cathode of D6 and C7
One end, the other end of C7 connect the cathode of the anode of D7, D8, and the anode of D1 connects one end and the ground connection of C2, and the other end of C2 connects
One end of the cathode of D2, the anode of D3 and C4 is connect, the other end of C4 connects anode, the cathode of D5 and one end of C6 of D4, C6's
The other end connects anode, the cathode of D7 and one end of C8 of D6, the anode of the other end connection D8 of C8 and one end of R1, and R1's is another
One end connects one end of C9 and the output as negative high voltage, the other end ground connection of C9.
Further, the value range of capacitor C1~C9 of the present invention is 1nF to 10nF.
Further, preamplifier of the present invention, by resistance R7, R12~R14, capacitor C10 and amplifier U2 group
At；
The signal output of one end connection detector of R7, the other end connect negative terminal, one end of R13 and one end of C1 of U1,
The other end of the other end connection C10 of R13 and the output end of U1, one end of the output end connection R14 of amplifier, the other end of R14
For signal output, one end of the anode connection R12 of U2, the other end ground connection of R12.
Further, R7 of the present invention is that (10 Ω to 10K), R13 are 10K (4K~100K) C10 value 100pF to 10 Ω
((1uS~50uS)/R13)), R12 value is identical with R13.
Further, the output end of distal power amplifier of the present invention by cable connection to step-up transformer and again
The input terminal of volt circuit.
Further, preamplifier and step-up transformer and voltage-multiplying circuit of the present invention are mounted on one piece of circuit board
On.
Beneficial effect
Distal power amplifier of the present invention is since output voltage amplitude is small, and (two cables are close to institute for cable capacitance
The characteristic of formation) caused by power loss it is small, distal power amplifier can drive longer cable, while high pressure is by low
What the rectangular wave driving transformer of dv/dt and multiplication of voltage generated, the interference of circuit is small can to save housing shroud, and can and as preposition
Amplifier is placed on same pcb board, and the volume of entire front-end circuit is made to reach minimum, meanwhile, if using miniaturization
Surface mount elements, the volume of circuit will also further reduce.
Detailed description of the invention
Fig. 1 is the connection relationship diagram in embodiment distal power amplifier circuit between each component.
Fig. 2 is the connection relationship diagram in embodiment step-up transformer and voltage-multiplying circuit between each component.
Fig. 3 is the connection relationship diagram in embodiment preamplifier circuit between each component.
Specific embodiment
The present invention is further elaborated with reference to the accompanying drawings and detailed description.
A kind of logging instrument front-end circuit of the embodiment of the present invention, by distal power amplifier, step-up transformer and piezoelectricity again
Road, preamplifier three parts composition, wherein preamplifier and step-up transformer and voltage-multiplying circuit are mounted on one piece of circuit board
On, input terminal of the output end of distal power amplifier by cable connection to step-up transformer, the output company of step-up transformer
It is connected to the input terminal of voltage-multiplying circuit.
Distal power amplifier, according to the external power drive signal for controlling output certain frequency and amplitude；Boosting transformation
Device and voltage-multiplying circuit generate the suitable high pressure of logging instrument nuclear detector under the control of the power drive signal；Preposition amplification
Device to the output signal shaping of nuclear detector (PMT pipe), is amplified to suitable curring time and amplitude.
As shown in Figure 1, the connection relationship between the component composition of distal power amplifier each section and each component
As follows: it is made of capacitor C11~C13, resistance R2~R6, R8~R11, R15 triode Q1, Q2, Q3, amplifier U1.R8, R11
4.99K, C13 is selected to select 1nF, Q3 that 2N2222, R3 is selected to select 100 Ω, R2, R4, R5, R9, R5, R10 select 1K, R6, R15
Select 10K, C11 select 0.1uF, C12 select 1nF, Q1 select 2SC4541, Q2 select 2SA1736, circuit supply voltage be+
12V and -12V.
The output frequency of distal power amplifier is controlled by single-chip I/O mouth, and the amplitude of output is controlled by ADC signal；Specifically
Connection relationship are as follows: O mouthfuls of I of termination CPU (single-chip microcontroller) of R11, one end of another termination C13 of R11 and one end of R8, C13
One end ground connection, one end of another termination C11 of R8 and the collector of Q3, one end of another termination R15 of C11, R15's is another
One end of the negative terminal of U1, one end of R6, one end of R4, R5 are terminated, the other end of R5 is grounded, one end of another termination C12 of R6,
The output of another termination U1 of C12 and one end of R3, the base stage of another termination Q1 of R3 and the base stage of Q2, the collector of Q1 connects+
The emitter of 12V, Q2 meet -12V, and the emitter of Q1 connects the collector of Q2 and the other end of R4 and defeated as high-voltage driven signal
Out.The base stage of Q3 connects one end of R9, another termination high voltage control signal of R9, and the emitter of Q3 connects one end of R10, and R10's is another
One end ground connection, the collector of Q1 connect+12V (+5V~+24V), and the emitter of Q2 meets -12V (- 5V~-24V).
The square wave of the I/O port output 10KHz of single-chip microcontroller of the embodiment of the present invention (CPU), due to the rising edge and failing edge of square wave
It is very steep, very strong interference can be brought, the low-pass filter being made of R11 and C13 can smooth square wave rising edge and failing edge,
This signal passes through the amplitude limiter circuit of R8, R9, R10 and Q3 composition, the amplitude limiting characteristic of circuit by ADC output voltage control, finally
This circuit can the controlled 10KHZ square wave of output amplitude.Amplifier U1 and Q1, Q2 and its related resistors form power amplification circuit, put
Big and output power and the satisfactory 10KHZ square wave of amplitude.The ducting capacity of Q3 by ADC control signal amplitude influences, by
It is connected in parallel in signal input circuit in Q3, so the output amplitude of entire circuit is controlled by ADC control signal.
As shown in Fig. 2, step-up transformer and voltage-multiplying circuit, the company between the component composition of each section and each component
It is as follows to connect relationship: it is made of capacitor C1~C9, diode D1~D8, resistance R1, step-up transformer T1, step-up transformer T1 packet
Include input winding A and output winding B.Capacitor C1~C8, capacitance selection 0805 encapsulate the chip ceramic capacitor of 500V2.2nF, C9
The chip ceramic capacitor of 3KV4.7nF is selected, R1 selects 1M, D1~D8 to select FR107.Transformer T1 selects EPC13 transformer,
The turn ratio is 1:10.
One end of the winding A of transformer T1 is grounded, another termination driving signal input of winding A, the winding B of transformer T1
One termination C1 one end, winding B the other end ground connection, anode, the cathode of D2 and one end of C3 of another termination D1 of C1, C3
Other end connection D3 anode, the cathode of D4 and one end of C5, the other end connection anode of D5 of C5, the cathode of D6 and C7
One end, the other end of C7 connect the cathode of the anode of D7, D8, and the anode of D1 connects one end and the ground connection of C2, and the other end of C2 connects
One end of the cathode of D2, the anode of D3 and C4 is connect, the other end of C4 connects anode, the cathode of D5 and one end of C6 of D4, C6's
The other end connects anode, the cathode of D7 and one end of C8 of D6, the anode of the other end connection D8 of C8 and one end of R1, and R1's is another
One end connects one end of C9 and the output as negative high voltage, the other end ground connection of C9.
The amplitude for the 10KHZ square-wave signal that cable of the embodiment of the present invention provides only has tens volts, and step-up transformer is risen
10 times (5~20 times) are pressed, then are boosted 10 times by voltage-multiplying circuit, the final voltage for obtaining lying prostrate 1,000 to 2,000 more.
As shown in figure 3, the connection relationship between the component composition of preamplifier each section and each component is as follows:
It is made of resistance R7, R12~R14, capacitor C10 and amplifier U2.Resistance R7 selects 100 Ω, and R12, R13 select 10K, C10 choosing
100pF is selected, R14 selects 49.9 Ω, amplifier U2 to select AD746, and circuit supply voltage is+12V (+5V~+15V) and -12V (- 5V
~-15V).
The signal output of one end connection detector (PMT pipe) of R7, the other end connect the negative terminal of U1, one end of R13 and C1
One end, R13 the other end connection C10 the other end and U1 output end, amplifier output end connection R14 one end, R14's
The other end is signal output, one end of the anode connection R12 of U1, the other end ground connection of R12.
R7 of the embodiment of the present invention is that damping resistance prevents the oscillation of circuit, and R13 and C10 form wave-shaping circuit, R14 be in order to
The build-out resistor of amplifier driving cable oscillation is prevented, entire circuit constitutes charge amplifier, amplifies the letter of detector (PMT pipe)
Number.
Distal power generator is linear amplifier, is driven by the IO output square wave of other circuits such as single-chip microcontroller (CPU) etc.,
Distal power generator can export the very low rectangular wave of dv/dt, and frequency can be controlled its output electricity in 10kHz or so by ADC
The amplitude of pressure, output voltage amplitude control at tens volts hereinafter, therefore reduce the power loss of cable capacitance charge and discharge,
Can in longer cable power signals (be greater than 10 meters), the step-up transformer T1 near detector can be by voltage
10 times are increased, is then boosted by multiplication of voltage component, the voltage of more than 1,000 to 2,000 volts of nuclear detector needs, entire electricity are finally reached
Route in interfere it is small, preamplifier and step-up transformer and its voltage-multiplying circuit may be mounted at together.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (10)
1. a kind of logging instrument front-end circuit, which is characterized in that by distal power amplifier, step-up transformer and voltage-multiplying circuit,
Preamplifier three parts composition；
Distal power amplifier, according to the external power drive signal for controlling output certain frequency and amplitude；
Step-up transformer and voltage-multiplying circuit generate the suitable height of logging instrument nuclear detector under the control of the power drive signal
Pressure；
Preamplifier to the output signal shaping of nuclear detector, is amplified to suitable curring time and amplitude.
2. logging instrument front-end circuit according to claim 1, which is characterized in that the input terminal of the distal power amplifier
Be separately connected the I/O port and ADC of CPU, the frequency of output power driving signal by the I/O port output signal of CPU control, it is defeated
Control of the amplitude of power drive signal by ADC output signal out.
3. logging instrument front-end circuit according to claim 2, which is characterized in that the distal power amplifier, by capacitor
C11~C13, resistance R2~R6, R8~R11, R15, triode Q1, Q2, Q3, amplifier U1 composition；
The I/O port of CPU is connect after being sequentially connected in series resistance R11, resistance R8, capacitor C11 and resistance R15 with the negative input end of amplifier U1,
The positive input terminal of amplifier U1 is grounded by resistance R2；ADC series resistance R9 is followed by the base stage of triode Q3, the transmitting of triode Q3
Pole is grounded by resistance R10, and the collector of triode Q3 is connected between resistance R8 and capacitor C11；Resistance R6 and capacitor C12 string
After connection, it is then parallelly connected between the negative input end and output end of amplifier U1；It is separately connected after the output end series resistance R3 of amplifier U1
The base stage of triode Q1 and the base stage of Q2, the collector of triode Q1 connect positive voltage, and the emitter of Q2 connects negative voltage, the transmitting of Q1
Pole connects the collector of Q2 as high-voltage driven signal output end, and high-voltage driven signal output end passes sequentially through resistance R4 and R5 and connects
Ground, and be connected between resistance R4 and R5 with the negative input end of amplifier U1.
4. logging instrument front-end circuit according to claim 3, which is characterized in that the range of the positive voltage be+5V~+
24V, the range of negative voltage are -5V~-24V, and R11 selects 1K~10K, C13 to select 100pF~10nF.
5. logging instrument front-end circuit according to claim 1, which is characterized in that the step-up transformer and voltage-multiplying circuit,
It is made of capacitor C1~C9, diode D1~D8, resistance R1, transformer T1；
One end of the winding A of transformer T1 is grounded, another termination driving signal input of winding A, and the one of the winding B of transformer T1
One end of C1 is terminated, the other end ground connection of winding B, anode, the cathode of D2 and one end of C3 of another termination D1 of C1, C3's is another
One end connects anode, the cathode of D4 and one end of C5 of D3, and the other end of C5 connects the one of the anode of D5, the cathode of D6 and C7
End, the other end of C7 connect the cathode of the anode of D7, D8, and the anode of D1 connects one end and the ground connection of C2, the other end connection of C2
One end of the cathode of D2, the anode of D3 and C4, anode, the cathode of D5 and one end of C6 of the other end connection D4 of C4, C6's is another
One end connects anode, the cathode of D7 and one end of C8 of D6, the anode of the other end connection D8 of C8 and one end of R1, and R1's is another
End connects one end of C9 and the output as negative high voltage, the other end ground connection of C9.
6. logging instrument front-end circuit according to claim 5, which is characterized in that the value range of the capacitor C1~C9 is
1nF to 10nF.
7. logging instrument front-end circuit according to claim 2, which is characterized in that the preamplifier, by resistance
R7, R12~R14, capacitor C10 and amplifier U2 composition；
The signal output of one end connection detector of R7, the other end connect negative terminal, one end of R13 and one end of C1 of U1, R13's
The other end connects the other end of C10 and the output end of U1, and one end of the output end connection R14 of amplifier, the other end of R14 is signal
Output, one end of the anode connection R12 of U2, the other end ground connection of R12.
8. logging instrument front-end circuit according to claim 7, which is characterized in that the R7 is 10 Ω to 10K, R13 4K
~100K, C10 value 100pF, R12 value are identical with R13.
9. logging instrument front-end circuit according to claim 1, which is characterized in that the output end of the distal power amplifier
Pass through cable connection to step-up transformer and the input terminal of voltage-multiplying circuit.
10. logging instrument front-end circuit according to claim 1, which is characterized in that the preamplifier and boosting transformation
Device and voltage-multiplying circuit are mounted on one piece of circuit board.
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| CN201910635288.2A CN110344814B (en) | 2019-07-15 | 2019-07-15 | Front-end circuit for logging instrument |
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| CN201910635288.2A CN110344814B (en) | 2019-07-15 | 2019-07-15 | Front-end circuit for logging instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20210312594A1 (en) * | 2020-04-01 | 2021-10-07 | Hitachi, Ltd. | Ultrasonic imaging apparatus and image processing apparatus |
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| CN110344814B (en) | 2024-05-10 |
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