CN114780467B - Control circuit and logging instrument - Google Patents
Control circuit and logging instrument Download PDFInfo
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- CN114780467B CN114780467B CN202210385590.9A CN202210385590A CN114780467B CN 114780467 B CN114780467 B CN 114780467B CN 202210385590 A CN202210385590 A CN 202210385590A CN 114780467 B CN114780467 B CN 114780467B
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
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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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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M9/00—Parallel/series conversion or vice versa
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0002—Serial port, e.g. RS232C
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0004—Parallel ports, e.g. centronics
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/38—Universal adapter
- G06F2213/3852—Converter between protocols
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Abstract
The application relates to the technical field of logging instruments, in particular to a control circuit and a logging instrument, wherein the control circuit comprises a main control unit, a first signal conversion unit, a signal transmission unit and a second signal conversion unit; the main control unit is used for outputting a serial control instruction to the first signal conversion unit; the first signal conversion unit is connected with the main control unit and is used for converting the serial control instruction into an electric signal; the signal transmission unit is used for transmitting an electric signal to the second signal conversion unit, and comprises a first transformer and a second transformer, wherein a primary coil of the first transformer is connected with the first signal conversion unit, and a secondary coil of the first transformer is connected with a primary coil of the second transformer through a twisted pair; the second signal conversion unit is connected with a secondary coil of the second transformer and used for converting the electric signals into serial control instructions to control the logging instrument. By the mode, the anti-interference capability of the main control unit can be enhanced, and the working stability of the logging instrument is improved.
Description
Technical Field
The application relates to the technical field of logging instruments, in particular to a control circuit and a logging instrument.
Background
In the existing logging instrument, the main control unit and the switch of the logging instrument are respectively located at different positions of the logging instrument, and are directly connected through a plurality of wires with shielding layers for data transmission, and because the wires pass through a longer path inside the instrument, the wires are required to be connected with each other through a multi-stage connecting plug.
Because the working voltage of the main control unit is lower than the working voltage when the logging instrument switch is conducted, the main control unit is easily affected by the high voltage when the switch is conducted when the logging instrument switch is conducted to generate faults or damage.
Disclosure of Invention
In view of the above problems, the application provides a control circuit and a logging instrument, which can enhance the anti-interference capability of a main control unit, improve the working stability of the logging instrument and reduce the overall electric installation difficulty of the instrument.
According to one aspect of the present application, there is provided a control circuit for a logging tool, comprising a main control unit, a first signal conversion unit, a signal transmission unit and a second signal conversion unit; the main control unit is used for outputting a serial control instruction to the first signal conversion unit; the first signal conversion unit is connected with the main control unit and is used for converting the serial control instruction into an electric signal; the signal transmission unit is used for transmitting an electric signal to the second signal conversion unit, and comprises a first transformer and a second transformer, wherein a primary coil of the first transformer is connected with the first signal conversion unit, and a secondary coil of the first transformer is connected with a primary coil of the second transformer through a twisted pair; the second signal conversion unit is connected with a secondary coil of the second transformer and used for converting the electric signals into serial control instructions to control the logging instrument.
In the control circuit provided by the application, the control instructions are transmitted between the main control unit and the second signal conversion unit through the twisted pair, and compared with the transducer control circuit on the logging instrument, the main control unit can be connected with the excitation control circuit of the transducer through the twisted pair, and as the electric wave radiated by one wire in the twisted pair in the transmission process can be counteracted by the electric wave emitted by the other wire, the anti-interference capability of a signal transmission medium between the main control unit and the switch can be effectively enhanced, the two ends of the twisted pair are respectively connected with the secondary coil of the first transformer and the primary coil of the second transformer, and the signal transmission path between the main control unit and the switch is physically isolated through the first transformer and the second transformer, so that the anti-interference capability of the main control unit is further improved. Because the twisted pair can only transmit common electric signals and cannot transmit logic electric signals (namely serial control instructions) sent by the main control unit, the primary coil of the first transformer is connected with the main control unit through the first signal conversion unit, so that the serial control instructions sent by the main control unit are converted into electric signals and are sequentially transmitted through the first transformer, the twisted pair and the second transformer, the secondary coil of the second transformer is connected with the second signal conversion unit, and the electric signals output by the second transformer are converted into serial control instructions, so that the control of a logging instrument switch is realized.
In an alternative, an interface protector is provided on the twisted pair. When the switch is a transducer switch of the logging instrument, an interface protector is arranged on the twisted pair wire in order to protect a chip in the main control unit from being damaged by high-voltage induced electricity or strong interference signals, so that anti-interference protection is carried out on signals transmitted on the twisted pair wire.
In an alternative manner, the serial control instructions include a serial clock instruction, a serial data instruction, and a trigger instruction; the control circuit also comprises a signal amplitude conversion unit, a trigger unit and a logic processing unit; the signal amplitude conversion unit is connected with the second signal conversion unit and is used for converting the serial clock instruction, the serial data instruction and the trigger instruction from the first level amplitude to the second level amplitude; the trigger unit is connected with the signal amplitude conversion unit and is used for generating a conduction duration instruction according to the trigger instruction of the second level amplitude; the logic processing unit is respectively connected with the signal amplitude conversion unit and the trigger unit and is used for generating a preset conduction time control instruction according to the serial clock instruction, the serial data instruction and the conduction time instruction of the second level amplitude and conducting control of the preset time on a switch on the logging instrument. In consideration of different working voltages between the logic processing unit and the second signal conversion unit, the signal amplitude conversion unit is connected between the logic processing unit and the second signal conversion unit, so that an instruction output by the second signal conversion unit can be smoothly input to the logic processing unit for processing, and the triggering unit is connected between the signal amplitude conversion unit and the logic processing unit, so that the triggering unit generates a conduction duration instruction according to a triggering instruction of a second level amplitude input by the signal amplitude conversion unit and outputs the conduction duration instruction to the logic processing unit, and further, the logic processing unit processes a serial clock instruction, a serial data instruction and a conduction duration instruction of the second level amplitude and generates a preset conduction duration control instruction, so that conduction control of a switch for a preset duration is realized.
In an optional manner, the second signal conversion unit and the logic processing unit are connected in parallel to two ends of the power supply, and the voltage conversion unit is connected in series in a branch where the second signal conversion unit is located, and the voltage conversion unit is used for converting voltages at two ends of the second signal conversion unit into working voltages of the second signal conversion unit. The second signal conversion unit and the logic processing unit are connected in parallel with the two ends of the same power supply, so that the second signal conversion unit and the logic processing unit share the same power supply, and the voltage conversion unit is connected in series in the branch where the second signal conversion unit is located, thereby simplifying the circuit structure, reducing the circuit faults, saving the area of a circuit board and reducing the production cost.
In an optional manner, the control circuit further includes a driving buffer unit, and the driving buffer unit is connected between the signal amplitude conversion unit and the logic processing unit and between the signal amplitude conversion unit and the trigger unit, and is used for driving and enhancing the serial clock instruction, the serial data instruction and the trigger instruction of the second level amplitude. The drive buffer unit is connected between the signal amplitude conversion unit and the logic processing unit and between the signal amplitude conversion unit and the trigger unit, so that the drive enhancement of the serial clock instruction, the serial data instruction and the trigger instruction of the second level amplitude is realized, and the anti-interference capability of the instruction signal is further improved.
In an alternative mode, the control circuit further includes a serial-parallel conversion unit, and the serial-parallel conversion unit is connected between the signal amplitude conversion unit and the logic processing unit, and is used for converting the serial clock instruction and the serial data instruction of the second level amplitude into multiple parallel control instructions and outputting the multiple parallel control instructions to the logic processing unit. The serial-parallel conversion unit is connected between the signal amplitude conversion unit and the logic processing unit, so that serial data transmitted by the signal amplitude conversion unit can be converted into multi-path parallel data, and control over a plurality of switches is further realized.
In an optional manner, the logic processing unit includes an and gate module, and the and gate module is configured to generate a plurality of paths of preset conduction duration control instructions according to the plurality of paths of parallel control instructions and the conduction duration instruction, so as to perform conduction control of preset durations on a plurality of switches on the logging instrument. The logic processing unit is set as the AND gate module to realize the AND operation of the multipath parallel control instructions and the on-time instructions, so that the control instructions with the preset on-time can be output to a plurality of switches on the logging instrument, and the control of the on-time of the plurality of switches is realized.
In an optional manner, the triggering unit comprises a monostable triggering module, and the monostable triggering module is used for generating a plurality of conduction time length instructions with different time lengths according to the triggering instruction of the second level amplitude; the AND gate module is used for generating a plurality of preset conduction time length control instructions with different conduction time lengths according to the plurality of parallel control instructions and the plurality of conduction time length instructions with different conduction time lengths so as to respectively conduct conduction control on the plurality of switches on the logging instrument with different preset time lengths. By setting the triggering unit as a monostable triggering module, the method realizes that the conduction time length instructions with different time lengths are output to the AND gate module, and further realizes that the conduction control of a plurality of switches on the logging instrument with different preset time lengths is respectively carried out.
In an optional mode, the control circuit further comprises a plurality of switch control modules, the switch control modules are connected with the and gate modules, the switch control modules are further connected with the switches on the logging instrument in a one-to-one correspondence mode, and the switch control modules are used for controlling the switches on the logging instrument correspondingly connected with the switch control modules to be conducted according to preset duration according to preset conduction duration control instructions sent by the and gate modules. The AND gate module is connected with a plurality of switches on the logging instrument in a one-to-one correspondence manner through a plurality of switch control modules, so that conduction control of different durations is respectively carried out on different switches on the logging instrument, and for the cable acoustic logging instrument, conduction excitation time of different transmitting transducers on the logging instrument can be respectively controlled, thereby meeting the working requirements.
According to another aspect of the application there is provided a logging tool comprising a control circuit as in any of the above.
The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic diagram of a control circuit according to an embodiment of the present application;
Fig. 2 is a schematic circuit diagram of a signal transmission unit and a second signal conversion unit in a control circuit according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a control circuit according to another embodiment of the present application;
fig. 4 is a schematic circuit diagram of a signal amplitude conversion unit in a control circuit according to an embodiment of the present application;
fig. 5 is a schematic circuit diagram of a circuit structure between a second signal conversion unit and a logic processing unit in the control circuit according to the embodiment of the present application;
fig. 6 is a schematic circuit diagram of a voltage conversion unit in a control circuit according to an embodiment of the present application;
Fig. 7 is a schematic circuit diagram of a driving buffer unit in a control circuit according to an embodiment of the present application;
Fig. 8 is a schematic circuit diagram of a serial-parallel conversion unit in a control circuit according to an embodiment of the present application;
Fig. 9 is a schematic circuit structure diagram of a control circuit provided by an embodiment of the present application between an and gate module and a switch control module;
fig. 10 is a schematic circuit diagram of a monostable trigger module in a control circuit according to an embodiment of the present application.
Reference numerals in the specific embodiments are as follows:
the device comprises a control circuit 100, a main control unit 110, a first signal conversion unit 120, a signal transmission unit 130, a first transformer 131, a twisted pair 132, an interface protector 1321, a second transformer 133, a second signal conversion unit 140, a signal amplitude conversion unit 150, a trigger unit 160, a monostable trigger module 161, a logic processing unit 170, an AND gate module 171, a voltage conversion unit 180, a driving buffer unit 190, a serial-parallel conversion unit 200 and a switch control module 210;
And a switch 500.
Detailed Description
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.
In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In describing embodiments of the present application, the term "plurality" refers to more than two (including two).
In the description of embodiments of the present application, the term "connected" refers to electrical connection unless specifically stated and defined otherwise; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.
The main control unit and the switch on the logging instrument are respectively located at different positions, for example, in the cable acoustic logging instrument, the main control unit and the excitation control circuit of the transducer are respectively arranged at different positions inside the instrument, and the main control unit and the excitation control circuit of the transducer are generally directly connected through four single-core wires with shielding layers to transmit control data.
The working voltage of the circuit where the main control unit is located is generally 3.3V, the working voltage of the excitation control circuit is generally 15V, and the excitation control circuit needs to directly control a 400V high-voltage emission switch, so that when the excitation control circuit controls the transducer to be excited and conducted, a high-voltage high-current pulse can be generated, the high-voltage high-current pulse can become strong interference noise, and a logic chip (such as a singlechip, an FPGA (Field Programmable GATE ARRAY, field programmable gate array)) and the like running according to a program in the main control unit can cause the conditions of program run or logic failure and the like, so that the logging instrument cannot work normally.
And 4 single-core wires are longer in the inside route of logging instrument, therefore need connect through a plurality of connectors, and the processing of shielding layer and welding technology requirement to wire joint department are higher in the logging instrument manufacturing process, and improper operation then very easily leads to the signal to ground short circuit scheduling problem in the circuit, causes the logging instrument reliability to too much transmission control wire also can cause the inside pencil of logging instrument numerous, walk the complicated scheduling problem.
Based on the above-mentioned problems, the present application provides a control circuit for a logging tool, wherein a control command is transmitted between a main control unit and a second signal conversion unit through twisted pair, compared with a transducer control circuit on the logging tool, the main control unit can be connected with an excitation control circuit of the transducer through twisted pair, and because the electric wave radiated by one wire in the twisted pair in the transmission process can be counteracted by the electric wave emitted by the other wire, the anti-interference capability of a signal transmission medium between the main control unit and the logging tool can be effectively enhanced, two ends of the twisted pair are respectively connected with a secondary coil of a first transformer and a primary coil of a second transformer, the signal transmission path between the main control unit and the logging tool is physically isolated through the first transformer and the second transformer, the anti-interference capability of the main control unit is further improved, and because the twisted pair can only transmit common electric signals, and can not transmit logic electric signals (i.e. serial control commands) emitted by the main control unit, so that the serial control commands emitted by the main control unit are converted into electric signals through the first signal conversion unit, and sequentially pass through the first transformer, the second transformer and the second transformer, and the second transformer are smoothly connected with the second transformer, thereby realizing the control of the logging tool.
In accordance with one aspect of the present application, a control circuit for a logging tool is provided, and referring specifically to fig. 1, a schematic block diagram of a control circuit 100 according to an embodiment of the present application is shown. As shown in the figure, the control circuit 100 includes: the device includes a main control unit 110, a first signal conversion unit 120, a signal transmission unit 130, and a second signal conversion unit 140. The main control unit 110 is configured to output a serial control instruction to the first signal conversion unit 120, the first signal conversion unit 120 is connected to the main control unit 110, and is configured to convert the serial control instruction into an electrical signal, and the signal transmission unit 130 is configured to transmit the electrical signal to the second signal conversion unit 140. The signal transmission unit 130 includes a first transformer 131 and a second transformer 133, the primary winding of the first transformer 131 is connected to the first signal conversion unit 120, the secondary winding of the first transformer 131 is connected to the primary winding of the second transformer 133 through a twisted pair 132, and the second signal conversion unit 140 is connected to the secondary winding of the second transformer 133 for converting an electrical signal into a serial control command to control a logging instrument (for example, may be a switch 500 on the logging instrument shown in fig. 1).
The main control unit generally adopts a microprocessor, which is a central processing unit composed of one or a few large-scale integrated circuits, and the circuits execute the functions of the control unit and the arithmetic logic unit. The microprocessor can complete the operations of fetching instructions, executing instructions, exchanging information with an external memory and a logic component, and the like, and generally controls the workflow of the whole logging instrument and the processing of data.
Referring to fig. 2 specifically, a circuit structure of a second transformer and a circuit structure of the second signal conversion unit 140 in the control circuit 100 of an embodiment are shown in the fig. 2, an electrical signal output by a secondary coil of the first transformer 131 sequentially passes through the twisted pair 132 and the second transformer 133 to reach the second signal conversion unit 140, the second signal conversion unit 140 may employ an interface control chip LTC6820, and the second signal conversion unit 140 converts the electrical signal into a serial control command and outputs the serial control command to the switch 500 of the logging instrument, so as to realize control of the switch 500. H1 and H2 in fig. 2 are wire holes that are plugged or soldered with two wires, respectively, to form twisted pair 132.
It can be understood that, for the first signal conversion unit 120, the signal conversion manner is exactly opposite, and the serial control instruction output by the main control unit 110 is converted into an electrical signal and transmitted to the first transformer 131, so that the circuit structure of the first signal conversion unit 120 is connected to the circuit structure of the second signal conversion unit 140 in the same manner, and the data transmission direction is opposite, and the circuit structure of the first signal conversion unit 120 is not illustrated here.
The twisted pair 132 has a simple structure, more stable transmission performance than a plurality of wires shielded by a single core, occupies only two cores of plugs, and is simple to manufacture and low in production cost.
In the control circuit 100 provided by the present application, the control command is transmitted between the main control unit 110 and the second signal conversion unit 140 through the twisted pair 132, and compared with the transducer control circuit on the logging instrument, the main control unit 110 can be connected with the excitation control circuit of the transducer through the twisted pair 132, and because the electric wave radiated by one wire in the twisted pair 132 in the transmission process can be offset by the electric wave emitted by the other wire, the anti-interference capability of the signal transmission medium between the main control unit 110 and the switch 500 can be effectively enhanced, the two ends of the twisted pair 132 are respectively connected with the secondary coil of the first transformer 131 and the primary coil of the second transformer 133, and the signal transmission path between the main control unit 110 and the switch 500 is physically isolated through the first transformer 131 and the second transformer 133, so that the anti-interference capability of the main control unit 110 is further improved. Because the twisted pair 132 can only transmit a common electrical signal and cannot transmit a logic electrical signal (i.e., a serial control command) sent by the main control unit 110, the primary coil of the first transformer 131 is connected with the main control unit 110 through the first signal conversion unit 120, so that the serial control command sent by the main control unit 110 is converted into an electrical signal and is smoothly sent through the first transformer 131, the twisted pair 132 and the second transformer 133 in sequence, and the secondary coil of the second transformer 133 is connected with the second signal conversion unit 140, so that the electrical signal output by the second transformer 133 is converted into a serial control command, and the control of the switch 500 of the logging instrument is realized.
In order to improve the anti-interference capability of the twisted pair, the present application further proposes an embodiment, and with continued reference to fig. 2, an interface protector 1321 is disposed on the twisted pair 132.
In particular, the interface protector 1321 may be an antistatic (electro-STATIC DISCHARGE, ESD) protection device or a port electromagnetic compatibility (Electro Magnetic Compatibility, EMC) protection device.
When the switch 500 is a transducer switch of a logging tool, in order to protect a chip in the main control unit from being damaged by high-voltage induced electricity or strong interference signals, an interface protector 1321 is provided on the twisted pair 132, so as to perform anti-interference protection on signals transmitted on the twisted pair 132.
In order to realize the conduction control of the switch 500 for a preset period of time, the present application further proposes an embodiment, and particularly referring to fig. 3, a schematic diagram of a modular structure of the control circuit 100 according to another embodiment is shown. As shown in the figure, the serial control instruction includes a serial clock instruction, a serial data instruction, and a trigger instruction. The control circuit 100 further includes a signal amplitude conversion unit 150, a trigger unit 160, and a logic processing unit 170, where the signal amplitude conversion unit 150 is connected to the second signal conversion unit 140, and is configured to convert the serial clock instruction, the serial data instruction, and the trigger instruction from a first level amplitude to a second level amplitude. The trigger unit 160 is connected to the signal amplitude conversion unit 150, and is configured to generate a conduction duration instruction according to the trigger instruction of the second level amplitude. The logic processing unit 170 is connected to the signal amplitude conversion unit 150 and the trigger unit 160, and is configured to generate a preset on-duration control instruction according to the serial clock instruction, the high-level serial data instruction, and the on-duration instruction of the second level amplitude, and perform on-control on the switch 500 on the logging instrument for a preset duration.
The logic processing unit 170 may be a logic chip, such as an and gate, etc. Since the level amplitude of the serial clock command, the serial data command and the trigger command output by the second signal conversion unit is generally +5v, and the level amplitude of the receivable command of the logic processing unit 170 is generally +15v, in order that the logic processing unit 170 can normally receive the serial clock command and the serial data command output by the second signal conversion unit 140 and the on-time command output by the trigger unit 160, the signal amplitude conversion unit 150 is connected between the second signal conversion unit 140 and the logic processing unit 170 and between the second signal conversion unit 140 and the trigger unit 160, so that the level amplitude of the serial clock command, the serial data command and the trigger command output by the second signal conversion unit 140 is converted from +5v to +15v by the signal amplitude conversion unit 150, so that the logic processing unit 170 can normally receive the serial clock command, the serial data command and the on-time command converted by the trigger command by the trigger unit 160, thereby realizing the on-control of the preset duration of the switch 500 on the logging instrument.
Referring to fig. 2 again, and further referring to fig. 4, the circuit structure of the signal amplitude conversion unit 150 provided in an embodiment is shown in fig. 4, the signal amplitude conversion unit 150 may employ a level conversion chip CD4504, a signal input port of the signal amplitude conversion unit 150 is connected to the second signal conversion unit 140, an output port of the signal amplitude conversion unit 150 is connected to the logic processing unit 170 and the trigger unit 160, the signal amplitude conversion unit 150 converts a serial clock instruction (CLK instruction in fig. 2 and 4) and a serial DATA instruction (DATA instruction in fig. 2 and 4) of a first level amplitude input by the second signal conversion unit 140 into a serial clock instruction (HLV CLK instruction in fig. 4) and a serial DATA instruction (HLV DATA instruction in fig. 4) of a second level amplitude respectively, and outputs the serial clock instruction (HLV DATA instruction in fig. 4) and the serial DATA instruction to the logic processing unit 170, and the signal amplitude conversion unit 150 converts a trigger instruction (TRIG instruction in fig. 2 and 4) of a first level amplitude input by the second signal conversion unit 140 into a trigger instruction (TRIG instruction in fig. 4) of a second level amplitude, and outputs the trigger instruction to the trigger unit 160, so that the logic processing unit 170 can change the level of the output level instruction smoothly.
It should be noted that, in the specific embodiment shown in fig. 4, since the working voltage of the second signal conversion unit 140 is +5v and the working voltage of the logic processing unit 170 is +15v, the signal amplitude conversion unit 150 is configured to convert the command signal with the first level amplitude of +5v into the command signal with the second level amplitude of +15v, and in other embodiments, the first level amplitude and the second level amplitude converted by the signal amplitude conversion unit 150 may be adjusted accordingly according to the specific working voltages of the second signal conversion unit 140 and the logic processing unit 170, so that the command signal sent by the second signal conversion unit 140 may be input to the logic processing unit 170 for processing after the level adjustment of the signal amplitude conversion unit 150.
In consideration of the difference in operating voltage between the logic processing unit 170 and the second signal conversion unit 140, the signal amplitude conversion unit 150 is connected between the logic processing unit 170 and the second signal conversion unit 140, so that an instruction output by the second signal conversion unit 140 can be smoothly input to the logic processing unit 170 for processing, and the trigger unit 160 is connected between the signal amplitude conversion unit 150 and the logic processing unit 170, so that the trigger unit 160 generates a conduction duration instruction according to a trigger instruction of a second level amplitude input by the signal amplitude conversion unit 150 and outputs the conduction duration instruction to the logic processing unit 170, and further, the logic processing unit 170 processes a serial clock instruction, a serial data instruction and the conduction duration instruction of the second level amplitude and generates a preset conduction duration control instruction, so as to realize conduction control of the switch 500 for a preset duration.
In order to optimize the circuit structure, the present application further proposes an embodiment, referring to fig. 5, which shows a circuit structure of the control circuit 100 in which the second signal conversion unit 140 is connected in parallel to the logic processing unit 170. As shown in the figure, the second signal conversion unit 140 and the logic processing unit 170 are connected in parallel to two ends of the power supply U, and a voltage conversion unit 180 is connected in series in a branch where the second signal conversion unit 140 is located, where the voltage conversion unit 180 is configured to convert voltages at two ends of the second signal conversion unit 140 into working voltages of the second signal conversion unit 140.
As shown in fig. 5, the operating voltage of the logic processing unit 170 is generally 15V, and the operating voltage of the second signal converting unit 140 is generally 5V, so that the logic processing unit 170 and the second signal converting unit 140 can be powered by one power source, by connecting the logic processing unit 170 and the second signal converting unit 140 in parallel to two ends of one power source U of 15V voltage, the logic processing unit 170 can be operated normally first, and by connecting the voltage converting unit 180 in series to one end of the branch circuit where the second signal converting unit 140 is located near the positive electrode of the power source U, the voltage across the second signal converting unit 140 is converted into 5V, so that the second signal converting unit 140 can be operated normally.
Specifically, referring to fig. 6, a circuit structure of a voltage conversion unit 180 in the control circuit 100 according to an embodiment is shown, where the voltage conversion unit 180 may use a linear buck chip TPS7B8150 to complete buck conversion, so as to convert +15v voltage to +5v voltage. It should be noted that, when the working voltages of the second signal conversion unit 140 and the logic processing unit 170 are other values, the voltage conversion unit 180 may be adaptively adjusted to achieve that the second signal conversion unit 140 and the logic processing unit 170 may be connected in parallel to the same power supply to perform the work.
By connecting the second signal conversion unit 140 and the logic processing unit 170 in parallel to two ends of the same power supply U and connecting the voltage conversion unit 180 in series in the branch where the second signal conversion unit 140 is located, the second signal conversion unit 140 and the logic processing unit 170 share the same power supply, which not only simplifies the circuit structure, reduces the failure rate of the circuit, but also saves the area of the circuit board and reduces the production cost.
In order to drive and enhance the serial clock command, the serial data command, and the trigger command with the second level amplitude, referring to fig. 3 again, the control circuit 100 further includes a driving buffer unit 190, the driving buffer unit 190 is connected between the signal amplitude conversion unit 150 and the logic processing unit 170, and between the signal amplitude conversion unit 150 and the trigger unit 160, and the driving buffer unit 190 is used for driving and enhancing the high-level serial clock command, the high-level serial data command, and the high-level trigger command with the second level amplitude.
Referring to fig. 7 specifically, a circuit structure of a driving buffer unit 190 in the control circuit 100 of an embodiment is shown, as shown in the figure, the driving buffer unit 190 may use a driving buffer chip CD4503, the driving buffer unit 190 performs driving enhancement on a serial clock instruction (HLV CLK instruction in the figure) and a serial DATA instruction (HLV DATA instruction in the figure) with a second level amplitude input by the signal amplitude conversion unit 150 to form a serial clock instruction (SER CLK instruction in the figure) after driving enhancement and a serial DATA instruction (SER DATA instruction in the figure) after driving enhancement, and outputs the serial clock instruction (SER DATA instruction in the figure) to the logic processing unit 170, and the driving buffer unit 190 further performs driving enhancement on a trigger instruction (tri trigger instruction in the figure) with a second level amplitude input by the signal amplitude conversion unit 150 to form a trigger instruction (FIRE trigger instruction after driving enhancement and outputs the trigger instruction to the trigger unit 160.
By connecting the driving buffer unit 190 between the signal amplitude conversion unit 150 and the logic processing unit 170 and between the signal amplitude conversion unit 150 and the trigger unit 160, the driving enhancement of the serial clock instruction, the serial data instruction and the trigger instruction with the second level amplitude is realized, so that the anti-interference capability of the instruction signal is further improved.
Considering that the plurality of switches 500 on the logging tool is generally plural, for example, the transducer switch on the logging tool is generally plural, and the serial data signal is transmitted by the signal amplitude conversion unit 150, and the serial data signal can only control a single switch, based on this, in order to realize the on control of the plurality of switches, the present application further proposes an embodiment, referring to fig. 3 again, the control circuit 100 further includes a serial-to-parallel conversion unit 200, where the serial-to-parallel conversion unit 200 is connected between the signal amplitude conversion unit 150 and the logic processing unit 170, and the serial-to-parallel conversion unit 200 is used for converting the serial clock command and the serial data command of the second level amplitude into the multiple parallel control command and outputting the multiple parallel control command to the logic processing unit 170.
Specifically, referring to fig. 8, a circuit structure of the serial-parallel conversion unit 200 in the control circuit 100 provided in an embodiment is shown, as shown in the figure, the serial-parallel conversion unit 200 may employ a serial-parallel conversion chip CD4094, so as to convert a serial clock instruction (HLV CLK instruction in the figure) and a serial DATA instruction (HLV DATA instruction in the figure) of a second level amplitude input by the signal amplitude conversion unit 150 into multiple parallel control instructions (for example, FIRE TRIG Q, FIRE TRIG Q, FIRE TRIG Q3, FIRE TRIG Q4 in the figure, FIRE TRIG Q, FIRE TRIG Q, etc. of course) and output the multiple parallel control instructions to the logic processing unit 170, so that the logic processing unit 170 processes the parallel control instructions and then controls the multiple switches 500.
As shown in fig. 3, for the embodiment in which the driving buffer unit 190 is connected between the signal amplitude conversion unit 150 and the logic processing unit 170, the serial-parallel conversion unit 200 is connected between the driving buffer unit 190 and the logic processing unit 170, thereby converting the serial clock instruction and the serial data instruction, which are driven to be enhanced by the driving buffer unit 190, into a multi-path parallel control instruction.
By connecting the serial-parallel conversion unit 200 between the signal amplitude conversion unit 150 and the logic processing unit 170, the serial data transmitted through the signal amplitude conversion unit 150 can be converted into multiple parallel data, thereby realizing control of the plurality of switches 500.
Further, referring to fig. 9, a circuit structure of the control circuit 100 according to an embodiment is shown when the logic processing unit 170 is an and gate module 171. In some embodiments of the present application, the logic processing unit 170 includes an and gate module 171, where the and gate module 171 is configured to generate a plurality of preset on-duration control commands according to the plurality of parallel control commands and the on-duration command, so as to perform on-control on the plurality of switches 500 on the logging tool for a preset duration.
In fig. 9, H3, H4, H5, and H6 are wiring holes, and are used to connect with different switches 500, respectively, so as to realize conduction control of different switches 500.
As shown in fig. 9, the and Gate module 171 may use the operation chip CD4093, and the and Gate module 171 performs and operation on the multiple parallel control instructions (FIRE TRIG Q a, FIRE TRIG Q, FIRE TRIG Q3, FIRE TRIG Q) input by the serial-parallel conversion unit 200 and the on-time instructions (FIRE trig_dip and FIRE trig_monono instructions) input by the trigger unit 160, so as to generate multiple preset on-time control instructions (gate_ X, gate _ Y, gate _a and gate_b instructions) to perform on control on the multiple switches 500 on the logging tool for a preset time period.
By setting the logic processing unit 170 as the and gate module 171, the and operation of the multipath parallel control instruction and the on-time instruction is realized, and then the control instruction with the preset on-time can be output to the plurality of switches 500 on the logging instrument, so that the control of the on-time of the plurality of switches 500 is realized.
Further, please continue to refer to fig. 9, and further referring to fig. 10, fig. 10 shows a circuit structure of the monostable trigger module 161 as the trigger unit 160 in the control circuit 100 according to an embodiment. In some embodiments of the present application, the triggering unit includes a monostable triggering module 161, where the monostable triggering module 161 is configured to generate a plurality of on-duration instructions with different durations according to the triggering instruction with the second level amplitude. The and gate module 171 is configured to generate a plurality of preset conduction duration control instructions with different conduction durations according to the plurality of parallel control instructions and the plurality of conduction duration instructions with different conduction durations, so as to respectively perform conduction control on the plurality of switches 500 on the logging instrument with different preset durations.
As shown in fig. 9 and 10, the monostable trigger module 161 may employ a monostable trigger chip CD14538, and the monostable trigger module 161 may output the on-duration instructions (FIRE tri_monono and FIRE TRIG DIP instructions in fig. 10) with different durations by performing different processing on the trigger instruction (HLV tri instruction in fig. 10) with the second level amplitude input by the signal amplitude conversion unit 150, and the parallel control instructions (FIRE TRIG Q1, FIRE TRIG Q2, FIRE TRIG Q3 and FIRE TRIG Q instructions in fig. 9) with different durations through the and operation of the and Gate module 171, so as to generate preset on-duration control instructions (gate_ X, gate _ Y, gate _a and gate_b instructions in fig. 9) with different multiplexing on-duration, and output the on-duration instructions (FIRE tri_monono and FIRE TRIG DIP instructions in fig. 9) to the switches 500 of the logging instrument through the wiring holes H1, H2, H3 and H4, respectively, thereby implementing on-control of the switches 500 with different preset durations.
It will be appreciated that for the embodiment in which the drive buffer unit 190 is connected between the signal amplitude conversion unit 150 and the logic processing unit 170, as shown in fig. 3, the monostable trigger module 161 is connected between the drive buffer unit 190 and the logic processing unit 170, so as to process the trigger instruction that is driven to be enhanced by the drive buffer unit 190 into a plurality of on-duration instructions of different durations.
For a cable acoustic tool, there are typically multiple types of transducers in the tool, and the time of on-excitation for the different transducers is also different. Based on this, by setting the trigger unit 160 as the monostable trigger module 161, the on-time instructions with different time durations are output to the and gate module 171, so that on-control of the plurality of switches 500 on the logging instrument with different preset time durations is realized.
Referring to fig. 9 again, the control circuit 100 further includes a plurality of switch control modules 210, where the switch control modules 210 are connected to the and gate module 171, the switch control modules 210 are further connected to the plurality of switches 500 on the logging tool in a one-to-one correspondence manner, and the switch control modules 210 are configured to control the switches 500 on the logging tool connected to the switch control modules 210 in a corresponding manner according to a preset on duration control instruction sent by the and gate module 171.
Specifically, the plurality of switch control modules 210 shown in fig. 9 are connected to the plurality of switches 500 on the logging tool in a one-to-one correspondence through the wiring holes H3, H4, H5, and H6 in the circuit structure thereof.
As shown in fig. 9, when the parallel control command FIRE TRIG Q input by the serial-parallel conversion unit 200 and the on-time command FIRE trig_dip input by the monostable trigger module 161 are and operated by the and Gate module 171, a low-level gate_x command is output to the switch control module 210 at the upper left in the figure, the MOS transistor Q1 is turned on, the wire hole H3 is turned on with the upper +15v power, and the switch 500 connected to the wire hole H3 is turned on. When the parallel control instruction FIRE TRIG Q input by the serial-parallel conversion unit 200 and the on-duration instruction FIRE trig_dip input by the monostable trigger module 161 are subjected to and operation by the and Gate module 171, a high-level gate_x instruction is output to the switch control module 210 at the upper left in the figure, the MOS transistor Q2 is turned on, the wire hole H3 is grounded from the lower side, and the switch 500 connected to the wire hole H3 is turned off.
The and gate module 171 is connected with the switches 500 on the logging instrument in a one-to-one correspondence manner through the switch control modules 210, so that conduction control of different durations is respectively carried out on different switches 500 on the logging instrument, and for the cable acoustic logging instrument, conduction excitation time of different transducers on the logging instrument can be respectively controlled, and the working requirements are met.
Referring to fig. 3 and 9, in an embodiment of the present application, a main control unit 110 in a control circuit 100 is connected to a switch 500 on a logging tool through a first signal conversion unit 120, a signal transmission unit 130, a second signal conversion unit 140, a signal amplitude conversion unit 150, a driving buffer unit 190, a serial-parallel conversion unit 200, a logic processing unit 170 and a switch control module 210, which are sequentially connected, and a trigger unit 160 is further connected between the driving buffer unit 190 and the logic processing unit 170, wherein the trigger unit 160 is a monostable trigger module 161, and the logic processing unit 170 is an and gate module 171.
Specifically, referring to fig. 9, taking the upper left switch control module 210 as an example, when the parallel control instruction (FIRE TRIG Q in the figure) input by the serial-parallel conversion unit 200 and the on-time instruction (FIRE trig_dip instruction) input by the trigger unit 160 in the and Gate module 171 are both high-level signal instructions, the and Gate module 171 performs the and operation on the high-level FIRE TRIG Q instruction and the high-level FIRE trig_dip instruction, and then outputs the low-level gate_x instruction to the switch control module 210, and at this time, the MOS transistor Q1 is turned on, and the switch 500 connected to the wire hole H3 is connected to +15v voltage conduction. When at least one of the command FIRE TRIG Q from the serial-parallel conversion unit 200 and the FIRE trig_dip command from the trigger unit 160 in the and Gate module 171 is a low level signal, the and Gate module 171 outputs a high level gate_x command to the switch control module 210, and at this time, the MOS transistor Q2 is turned on, and the switch 500 connected to the wire hole H3 is turned off. Thereby, the on or off control of the corresponding switch 500 is realized by controlling the parallel control instruction input by the serial-parallel conversion unit 200 and the on-time instruction input by the trigger unit 160 to be a high-level signal instruction or a low-level signal instruction.
For a specific description of the on-time, referring to fig. 10, in the monostable trigger module 161, the outputted FIRE trig_monono instruction is a high-level signal instruction or a low-level signal instruction is determined by the resistor R18 and the capacitor C7, specifically, when the capacitor C7 is charged, in the process that the charge amount stored in the capacitor C7 is increased from 0 to a preset threshold, the FIRE trig_monono instruction outputted by the monostable trigger module 161 is a high-level signal instruction, and after the charge amount stored in the capacitor C7 reaches the preset threshold, the FIRE trig_monono instruction outputted by the monostable trigger module 161 is converted into a low-level signal instruction, so that the adjustment of the time required for increasing the charge amount stored in the capacitor C7 from 0 to the preset threshold is realized by adjusting the resistance value of the resistor R18 or the preset threshold, and further, the control of the duration of the FIRE trig_monono instruction outputted by the monostable trigger module 161 to be the high-level signal instruction is realized. Similarly, the output duration of the FIRE TRIG_DIP command as a high signal command is determined by R19 and C8.
According to another aspect of the embodiment of the present application, there is also provided a logging tool including the control circuit 100 of any of the above embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; while the application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (9)
1. The control circuit is used for a logging instrument and is characterized by comprising a main control unit, a first signal conversion unit, a signal transmission unit, a second signal conversion unit, a signal amplitude conversion unit, a trigger unit and a logic processing unit;
The main control unit is used for outputting a serial control instruction to the first signal conversion unit; the serial control instruction comprises a serial clock instruction, a serial data instruction and a trigger instruction;
The first signal conversion unit is connected with the main control unit and is used for converting the serial control instruction into an electric signal;
the signal transmission unit is used for transmitting the electric signal to the second signal conversion unit, the signal transmission unit comprises a first transformer and a second transformer, a primary coil of the first transformer is connected with the first signal conversion unit, and a secondary coil of the first transformer is connected with a primary coil of the second transformer through a twisted pair;
The second signal conversion unit is connected with a secondary coil of the second transformer and is used for converting the electric signal into the serial control instruction so as to control the logging instrument;
The signal amplitude conversion unit is connected with the second signal conversion unit and is used for converting the serial clock instruction, the serial data instruction and the trigger instruction from a first level amplitude to a second level amplitude;
The trigger unit is connected with the signal amplitude conversion unit and is used for generating a conduction duration instruction according to the trigger instruction of the second level amplitude;
the logic processing unit is respectively connected with the signal amplitude conversion unit and the trigger unit and is used for generating a preset conduction duration control instruction according to the serial clock instruction, the serial data instruction and the conduction duration instruction of the second level amplitude and conducting control of preset duration on a switch on the logging instrument.
2. The control circuit of claim 1, wherein an interface protector is provided on the twisted pair.
3. The control circuit according to claim 1, wherein the second signal conversion unit and the logic processing unit are connected in parallel to two ends of a power supply, and a voltage conversion unit is connected in series in a branch where the second signal conversion unit is located, and the voltage conversion unit is configured to convert voltages at two ends of the second signal conversion unit into working voltages of the second signal conversion unit.
4. The control circuit of claim 1, further comprising a drive buffer unit coupled between the signal amplitude conversion unit and the logic processing unit and between the signal amplitude conversion unit and the trigger unit, the drive buffer unit configured to drive enhance the serial clock instruction, the serial data instruction, and the trigger instruction of the second level amplitude.
5. The control circuit according to any one of claims 1, 3 to 4, further comprising a serial-to-parallel conversion unit connected between the signal amplitude conversion unit and the logic processing unit, the serial-to-parallel conversion unit being configured to convert the serial clock instruction and the serial data instruction of the second level amplitude into a multiplexed parallel control instruction and output the multiplexed parallel control instruction to the logic processing unit.
6. The control circuit of claim 5, wherein the logic processing unit comprises an and gate module configured to generate a plurality of the preset on-duration control commands according to the plurality of the parallel control commands and the on-duration command, so as to perform on-control of the plurality of switches on the logging tool for a preset duration.
7. The control circuit of claim 6, wherein the trigger unit comprises a monostable trigger module for generating a plurality of the on-time instructions of different durations from the trigger instruction of the second level magnitude;
The AND gate module is used for generating the control instructions of the preset conduction time lengths with different multi-path conduction time lengths according to the multi-path parallel control instructions and the conduction time length instructions with different time lengths so as to respectively conduct conduction control of the switches on the logging instrument with different preset time lengths.
8. The control circuit of claim 7, further comprising a plurality of switch control modules, wherein the switch control modules are connected with the and gate modules, the switch control modules are further used for being respectively connected with the switches on the logging tool in a one-to-one correspondence manner, and the switch control modules are used for controlling the switches on the logging tool, which are correspondingly connected with the switch control modules, to be turned on according to the preset on-time control instruction sent by the and gate modules.
9. A logging tool comprising a control circuit according to any one of claims 1-8.
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| CN214221166U (en) * | 2020-10-12 | 2021-09-17 | 西安石油大学 | An automatic gain adjustment device and system for single-core cable logging data transmission |
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| GB2401295B (en) * | 2003-04-28 | 2005-07-13 | Schlumberger Holdings | Redundant systems for downhole permanent installations |
| US8908779B2 (en) * | 2011-04-29 | 2014-12-09 | Linear Technology Corporation | Isolated communications interface |
| US10774597B2 (en) * | 2018-04-26 | 2020-09-15 | Halliburton Energy Services, Inc. | Downhole tool using a unified electronic interface |
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| US6369718B1 (en) * | 1998-05-22 | 2002-04-09 | Schlumberger Technology Corporation | Oil well monitoring and control system communication network |
| CN209787732U (en) * | 2019-01-24 | 2019-12-13 | 上海润京能源科技有限公司 | Anti-electromagnetic interference device |
| CN110671098A (en) * | 2019-09-25 | 2020-01-10 | 中国科学院地质与地球物理研究所 | A single-core bus circuit device under drilling while drilling |
| CN214221166U (en) * | 2020-10-12 | 2021-09-17 | 西安石油大学 | An automatic gain adjustment device and system for single-core cable logging data transmission |
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