Sound wave signal processing main control circuit

Abstract

The utility model discloses a sound wave signal processing main control circuit comprising a magnetic positioning signal processing circuit, a high speed ADC, a microcontroller, an external CAN communication circuit, an internal CAN communication circuit, a power supply voltage stabilization filter circuit, a synchronous drive circuit, a microcontroller and a high temperature oscillation circuit which are electrically connected. According to the utility model, the high-speed ADC is adopted to carry out analog-to-digital conversion, sound wave signals can be captured at the highest sampling rate of 12Msps, and the real-time performance and integrity of the signals are ensured; through the internal and external CAN communication circuits, the device can realize high-speed and reliable data transmission, the synchronous signal driving circuit ensures time sequence synchronization of data acquisition and transmission, and the accuracy of signal processing is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of acoustic wave well logging, in particular to a main control circuit for acoustic wave signal processing. Background Art

[0002] Acoustic variable density logging is a type of acoustic logging. Its principle is to use the large difference in acoustic impedance between cement and mud (or water) to attenuate sound waves propagating along the casing axis, thereby reflecting the quality of the cement-casing and casing-formation bonds. Acoustic variable density logging evolved from acoustic amplitude logging. This method has played a positive role in oilfield exploration and development.

[0003] In the process of digital acoustic variable density logging, what we want to obtain is the full wave train information after the acoustic wave propagates in the formation. Through ground software digital signal processing, we can obtain waveform information such as casing wave, formation wave, direct wave, etc., and thus carry out cementing quality analysis.

[0004] However, the current acoustic amplitude logging method is to transmit the entire acoustic wave train to the ground, and the ground logging system calculates the amplitude of the first wave. Traditional digital acoustic amplitude logging instruments use a large number of small and medium-sized integrated components. The large number of components used makes the instrument longer, affecting the overall temperature resistance and performance of the digital acoustic logging instrument. In addition, signal acquisition and data transmission are completed by the same MCU, which has a heavy workload and limits the rate of signal acquisition and data transmission. Utility Model Content

[0005] In order to solve the above problem, the utility model provides a main control circuit for processing an acoustic wave signal to solve the problem.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] A main control circuit for processing an acoustic wave signal comprises an electrically connected magnetic positioning signal processing circuit, a high-speed ADC, a microcontroller, an external CAN communication circuit, an internal CAN communication circuit, a power supply voltage stabilizing and filtering circuit, a synchronous signal driving circuit, a microcontroller and a high-temperature oscillation circuit.

[0008] It is further configured that: the magnetic positioning signal processing circuit includes a differential amplifier, a prefilter, and a programmable amplifier circuit electrically connected in sequence.

[0009] It is further configured as follows: the differential amplifier includes an amplifier U1A, a capacitor C3, a resistor R1 and a resistor R5 connected to the capacitor C3, the resistor R5 is connected to the negative input 2# of the amplifier U1A, and the negative input 2# of the amplifier U1A is connected to the output pin 1# of the amplifier U1A through a resistor R9.

[0010] It is further configured as follows: the pre-filter includes a resistor R2 connected to the output pin 1# of the amplifier U1A, the other end of the resistor R2 is connected to the positive input 5# and output pin 7# of the amplifier U1B through a resistor R13 and a capacitor C4 respectively, the positive input 5# of the amplifier U1B is grounded through a capacitor C7, the negative input 6# of the amplifier U1B is grounded through a resistor R3, and the negative input 6# of the amplifier U1B is then connected to the output pin 7# of the amplifier U1B through a resistor R4.

[0011] It is further configured as follows: the programmable amplifier circuit includes a resistor R9 connected to the output pin 7# of the amplifier U1B, the other end of the resistor R9 is respectively connected to the input pin D of the digital switch U3 and the negative input 2# of the amplifier U1A, the IN pin of the digital switch U3 is directly connected to an IO port of the CPU, the output pins SA and SB of the digital switch U3 are respectively connected to the output pin 1# of the amplifier U1A through the resistor R4 and the resistor R5, the negative input 2# of the amplifier U1A is connected to the capacitor C4, and the other end of the capacitor C4 is connected to the output pin 1# of U1A.

[0012] It is further configured as follows: the external CAN communication circuit includes a magnetic coupler U10 and an external CAN controller U8, the transmitting pin CANTXB is pulled up by a pull-up resistor R28 and connected to the 3# pin of the magnetic coupler U10, the receiving pin CANRXB is pulled up by a pull-up resistor R25 and connected to the 2# pin of the magnetic coupler U10, the power pin 1# of the magnetic coupler U10 is connected to the +3V power supply, the ground pin 4# of the magnetic coupler U10 is connected to GND, the power pin 8# of the magnetic coupler U10 is connected to the isolated +F3V power supply, the ground pin 5# of the magnetic coupler U10 is connected to the ground FGND of the isolated power supply, the output pin 6#, input pin 7#, power pin 8#, and ground pin 5# of the magnetic coupler U10 are directly connected to the input pin 1#, output pin 4#, power pin 3#, and function pin 5# of the external CAN controller U8 respectively, the power pin 8#, 2# pin, and ground pin 5# of the magnetic coupler U10 are all connected to the ground FGND of the isolated power supply, and the output pin 6# and output pin 7# of the magnetic coupler U10 are connected to the external CAN bus.

[0013] It is further configured as follows: the internal CAN communication circuit includes an internal CAN controller U2, the transmitting pin CAN1TXB is pulled up by a pull-up resistor R6 and connected to the input pin 1# of the internal CAN controller U2, the receiving pin CAN1RXB is pulled up by a pull-up resistor R7 and connected to the 4# pin of the internal CAN controller U2, the power pin 3# of the internal CAN controller U2 is connected to the +3V power supply, the function pin 8#, ground pin 2#, and function pin 5# of the internal CAN controller U2 are all connected to GND, and the output pin 6# and output pin 7# of the internal CAN controller U2 are connected to the internal CAN bus.

[0014] It is further configured as follows: it also includes an isolated power supply for power supply, the isolated power supply includes a low-voltage linear regulator U7, the +5V power supply is connected to the ground FGND through capacitors C1 and C2 respectively, the +5V power supply and FGND are respectively connected to the input pin 6# and the ground pin 4# of the low-voltage linear regulator U7, the enable pin 3# of the low-voltage linear regulator U7 is also connected to the ground FGND, the resistor R27 is respectively connected to the output pin 7# and the reference pin 2# of the low-voltage linear regulator U7, the reference pin 2# of the low-voltage linear regulator U7 is grounded through resistor R28, and the output pin 7# of the low-voltage linear regulator U7 is connected to FGND through resistors C18 and C19.

[0015] It is further configured as follows: the synchronization signal driving circuit includes a driver U11 and an amplifier U12A, the synchronization signal IN of the microcontroller is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to the input pin 5# of the driver U11, the input pin 5# of the driver U11 is grounded to GND through the resistor R3, the input pin 5# of the driver U11 is connected to the negative electrode of the diode D2, the positive electrode of D2 is grounded to GND, the 2# and 7# of the driver U11 are connected to GND together, the output pin 12# of the driver U11 is connected to the positive input 3# of the amplifier U12A, and the negative input 2# of the amplifier U12A is directly connected to the output pin 1# of the amplifier U12A.

[0016] It is further configured as follows: the microcontroller uses a thick die circuit SM470R1B1MHKPS high temperature ARM7 as a processor, is configured with 64K SARAM, has built-in RAM and 1M flash memory.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are:

[0018] 1. The utility model adopts a high-speed ADC for analog-to-digital conversion, which can capture acoustic signals at a sampling rate of up to 12Msps, ensuring the real-time and integrity of the signal; through internal and external CAN communication circuits, the device can achieve high-speed and reliable data transmission, and the synchronous signal driving circuit ensures the timing synchronization of data acquisition and transmission, improving the accuracy of signal processing.

[0019] 2. By modularizing key functions such as magnetic positioning signal processing, high-speed ADC, and CAN communication, the number and volume of integrated components can be reduced, thereby reducing the size of the entire device and improving temperature resistance.

[0020] 3. Through the design of differential amplifier, pre-filter and programmable amplifier circuit, the signal amplification and filtering process is optimized and the signal distortion is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of an application scenario of the present utility model;

[0023] Figure 2 This is a schematic diagram of the internal connection principle of the circuit of the present utility model;

[0024] Figure 3 This is a circuit schematic diagram of the magnetic positioning signal processing circuit of the utility model;

[0025] Figure 4 This is the circuit schematic diagram of the external CAN communication circuit of the utility model;

[0026] Figure 5 This is the circuit schematic diagram of the internal CAN communication circuit of the utility model;

[0027] Figure 6 This is the circuit schematic diagram of the isolated power supply of the utility model;

[0028] Figure 7 This is a circuit schematic diagram of the synchronous signal driving circuit of the utility model;

[0029] Figure 8 It is a schematic diagram of the appearance of the utility model. DETAILED DESCRIPTION

[0030] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] Example

[0033] Reference Figures 1-8 , is a main control circuit for acoustic wave signal processing disclosed by the utility model, and the acoustic wave instrument is applied to the acoustic wave instrument. Specifically, the main control circuit for acoustic wave signal processing includes a magnetic positioning signal processing circuit, a high-speed ADC, a microcontroller, an external CAN communication circuit, an internal CAN communication circuit, a power supply voltage stabilization and filtering circuit, a synchronous signal driving circuit, a microcontroller and a high-temperature oscillation circuit.

[0034] Among them, the magnetic positioning signal processing circuit includes a differential amplifier, a prefilter, and a programmable amplifier circuit that are electrically connected in sequence; the CCL differential signal is output to the prefilter through the differential amplifier, and then output to the programmable amplifier circuit after filtering by the prefilter. The CCL gain programmable amplifier circuit adopts two gain levels.

[0035] Reference Figure 3 The magnetic positioning signal processing circuit includes an amplifier U1A and an amplifier U1B of model AD8634HFZ, a digital switch U3 of model DG419, a capacitor C3, a resistor R1, a resistor R5, a resistor R9, a resistor R2, a resistor R13, a capacitor C4, a capacitor C7, a resistor R3, and a resistor R4;

[0036] Specifically, the magnetic positioning signals CCL+ and CCL- pass through both ends of capacitor C3 and are then transmitted to the negative input 2# and positive input 3# of amplifier U1A through resistor R1 and resistor R5 respectively. The negative input 2# of amplifier U1A is connected to the output pin 1# of amplifier U1A through resistor R9, thereby forming a differential amplifier.

[0037] Output pin 1# of amplifier U1A is connected to resistor R2, and the other end of resistor R2 is connected to positive input 5# and output pin 7# of amplifier U1B through resistor R13 and capacitor C4 respectively. Positive input 5# of amplifier U1B is grounded through capacitor C7, and negative input 6# of amplifier U1B is grounded through resistor R3. Negative input 6# of amplifier U1B is then connected to output pin 7# of amplifier U1B through resistor R4, thus forming a pre-value filter.

[0038] Output pin 7# of amplifier U1B is connected to resistor R9, the other end of resistor R9 is respectively connected to input pin D of digital switch U3 and negative input 2# of amplifier U1A, the IN pin of digital switch U3 is directly connected to an IO port of CPU, output pins SA and SB of digital switch U3 are respectively connected to output pin 1# of amplifier U1A through resistor R4 and resistor R5, negative input 2# of amplifier U1A is connected to capacitor C4, the other end of capacitor C4 is connected to output pin 1# of U1A, thus forming a programmable amplifier circuit.

[0039] In this embodiment, the prefilter is a 20Hz second-order low-pass filter. The amplified voltage signal is connected to a high-speed ADC for analog-to-digital conversion. The high-speed ADC has a 12-bit bandwidth and a maximum sampling rate of 12Msps. The voltage reference used by the high-speed ADC consists of a high-precision, low-drift reference chip and a voltage divider resistor. This voltage reference circuit has a temperature drift of only 1ppm / °C.

[0040] Reference Figure 4 The external CAN communication circuit includes a magnetic coupler U10 of model ISO7221 and an external CAN controller U8 of model SN65HVD233SHKJ. The transmit pin CANTXB is pulled up by a pull-up resistor R28 and connected to the 3# pin of the magnetic coupler U10. The receive pin CANRXB is pulled up by a pull-up resistor R25 and connected to the 2# pin of the magnetic coupler U10. The power pin 1# of the magnetic coupler U10 is connected to the +3V power supply, the ground pin 4# of the magnetic coupler U10 is connected to GND, and the power pin 8# of the magnetic coupler U10 is connected to the isolation +F3 V power supply, the ground pin 5# of the magnetic coupler U10 is connected to the ground FGND of the isolated power supply, the output pin 6#, input pin 7#, power pin 8#, and ground pin 5# of the magnetic coupler U10 are directly connected to the input pin 1#, output pin 4#, power pin 3#, and function pin 5# of the external CAN controller U8 respectively, the power pin 8#, 2# pin, and ground pin 5# of the magnetic coupler U10 are all connected to the ground FGND of the isolated power supply, the output pin 6# and output pin 7# of the magnetic coupler U10 are connected to the external CAN bus, thus completing the external CAN communication circuit.

[0041] Reference Figure 5 The internal CAN communication circuit includes an internal CAN controller U2 with model SN65HVD233SHKJ. The transmit pin CAN1TXB is pulled up by the pull-up resistor R6 and connected to the input pin 1# of the internal CAN controller U2. The receive pin CAN1RXB is pulled up by the pull-up resistor R7 and connected to the 4# pin of the internal CAN controller U2. The power pin 3# of the internal CAN controller U2 is connected to the +3V power supply. The function pin 8#, ground pin 2#, and function pin 5# of the internal CAN controller U2 are all connected to GND. The output pin 6# and output pin 7# of the internal CAN controller U2 are connected to the internal CAN bus. The internal CAN communication circuit is now completed.

[0042] In this embodiment, the external CAN bus circuit (SN65HVD233SHKJ) is connected to the microcontroller via a magnetic coupler (ISO7221CH) to achieve electrical isolation. A 3.3V isolated power supply (TPS76901SHKJ) is also provided to power the CAN circuit. The internal CAN bus circuit (SN65HVD233SHKJ) is directly connected to the microcontroller.

[0043] Reference Figure 6 The isolated power supply includes a low-voltage linear regulator U7 with model TPS76901SHKJ. The +5V power supply is connected to the ground FGND of the CAN power supply through capacitors C1 and C2 respectively. The +5V power supply and FGND are respectively connected to the input pin 6# and the ground pin 4# of the low-voltage linear regulator U7. The enable pin 3# of the low-voltage linear regulator U7 is also connected to the ground FGND. The resistor R27 is respectively connected to the output pin 7# and the reference pin 2# of the low-voltage linear regulator U7. The reference pin 2# of the low-voltage linear regulator U7 is grounded through resistor R28. The output pin 7# of the low-voltage linear regulator U7 is connected to FGND through resistors C18 and C19. Finally, the output pin 7# of U7 outputs the +F3V power required by the external CAN communication circuit.

[0044] In this embodiment, the microcontroller uses the thick-die circuit SM470R1B1MHKPS high-temperature ARM7 processor, equipped with 64KB of SARAM, internal RAM, and 1MB of flash memory. It features a 60MHz clock speed, a 16 / 32-bit RISC core, and is capable of coordinating the massive data transmission and processing of two CAN buses. Multiple IO ports are also included to facilitate various peripheral configuration and data transmission.

[0045] Furthermore, the present invention also features a synchronization signal driver circuit. The microcontroller's I / O output is fed into a level converter (NCV1413) and then into a voltage follower (AD8634HFZ). This circuit provides a synchronization signal for synchronizing the timing of the transmitting transducer and the acoustic signal acquisition. The synchronization signal is TTL-level, and an accelerator reduces edge delay to less than 15ns.

[0046] Specifically, the synchronization signal driving circuit includes a driver U11 with model NCV1413 and an amplifier U12A of AD8634HFZ. The synchronization signal IN of the microcontroller is connected to the positive pole of the diode D1, the negative pole of the diode D1 is connected to the input pin 5# of the driver U11, the input pin 5# of the driver U11 is grounded to GND through the resistor R3, the input pin 5# of the driver U11 is connected to the negative pole of the diode D2, the positive pole of D2 is grounded to GND, the 2# and 7# of the driver U11 are connected to GND together, the output pin 12# of the driver U11 is connected to the positive input 3# of the amplifier U12A, the negative input 2# of the amplifier U12A is directly connected to the output pin 1# of the amplifier U12A, and the output pin 1# of the amplifier U12A outputs the synchronization signal processed by the synchronization signal driving circuit.

[0047] The working principle and beneficial effects of the utility model are as follows:

[0048] The power supply is output to the microcontroller after passing through the power supply voltage stabilizing and filtering circuit; the microcontroller controls the working mode and working parameters of the acoustic instrument by directly connecting to the internal CAN communication circuit; the microcontroller controls the transmission mode and working parameters of the transmitting module by directly connecting to the external CAN communication circuit; the microcontroller is directly connected to the synchronization signal driving circuit to provide a synchronization signal to the acoustic signal filtering circuit; the magnetic positioning signal is output to the microcontroller after passing through the magnetic positioning signal processing circuit controlled by the IO of the microcontroller, and the hardware synchronization effect is achieved through the synchronization signal driving circuit, assisting the two high-temperature CAN interface circuits to perform software-controlled internal and external communication time-sharing operations, making communication more efficient and achieving the effect of accurately controlling the acoustic wave emission and acquisition timing.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A main control circuit for processing an acoustic wave signal, characterized in that: It includes an electrically connected magnetic positioning signal processing circuit, a high-speed ADC, a microcontroller, an external CAN communication circuit, an internal CAN communication circuit, a power supply voltage stabilization and filtering circuit, a synchronization signal driving circuit, a microcontroller and a high-temperature oscillation circuit; the magnetic positioning signal processing circuit includes a differential amplifier, a prefilter, and a programmable amplifier circuit that are electrically connected in sequence; the programmable amplifier circuit includes a resistor R9 connected to the output pin 7# of the amplifier U1B, the other end of the resistor R9 is respectively connected to the input pin D of the digital switch U3 and the negative input 2# of the amplifier U1A, the IN pin of the digital switch U3 is directly connected to an IO port of the CPU, the output pins SA and SB of the digital switch U3 are respectively connected to the output pin 1# of the amplifier U1A through resistors R4 and R5, the negative input 2# of the amplifier U1A is connected to the capacitor C4, and the other end of the capacitor C4 is connected to the output pin 1# of U1A.

2. The main control circuit for processing an acoustic wave signal according to claim 1, characterized in that: The differential amplifier includes an amplifier U1A, a capacitor C3, resistors R1 and R5 connected to the capacitor C3, the resistor R5 is connected to the negative input 2# of the amplifier U1A, and the negative input 2# of the amplifier U1A is connected to the output pin 1# of the amplifier U1A through a resistor R9.

3. The main control circuit for processing acoustic wave signals according to claim 2, characterized in that: The pre-filter includes a resistor R2 connected to the output pin 1# of the amplifier U1A. The other end of the resistor R2 is connected to the positive input 5# and output pin 7# of the amplifier U1B through a resistor R13 and a capacitor C4 respectively. The positive input 5# of the amplifier U1B is grounded through a capacitor C7, and the negative input 6# of the amplifier U1B is grounded through a resistor R3. The negative input 6# of the amplifier U1B is then connected to the output pin 7# of the amplifier U1B through a resistor R4.

4. The main control circuit for processing an acoustic wave signal according to claim 1, characterized in that: The external CAN communication circuit includes a magnetic coupler U10 and an external CAN controller U8. The transmit pin CANTXB is pulled up by a pull-up resistor R28 and connected to pin 3# of the magnetic coupler U10. The receive pin CANRXB is pulled up by a pull-up resistor R25 and connected to pin 2# of the magnetic coupler U10. The power pin 1# of the magnetic coupler U10 is connected to the +3V power supply, the ground pin 4# of the magnetic coupler U10 is connected to GND, the power pin 8# of the magnetic coupler U10 is connected to the isolated +F3V power supply, and the ground pin 5# of the magnetic coupler U10 is connected to the ground FGND of the isolated power supply. The output pin 6#, input pin 7#, power pin 8#, and ground pin 5# of the magnetic coupler U10 are directly connected to the input pin 1#, output pin 4#, power pin 3#, and function pin 5# of the external CAN controller U8 respectively. The power pin 8#, pin 2#, and ground pin 5# of the magnetic coupler U10 are all connected to the ground FGND of the isolated power supply. The output pin 6# and output pin 7# of the magnetic coupler U10 are connected to the external CAN bus.

5. The main control circuit for processing acoustic wave signals according to claim 4, characterized in that: The internal CAN communication circuit includes an internal CAN controller U2, the transmitting pin CAN1TXB is pulled up by a pull-up resistor R6 and connected to the input pin 1# of the internal CAN controller U2, the receiving pin CAN1RXB is pulled up by a pull-up resistor R7 and connected to the 4# pin of the internal CAN controller U2, the power pin 3# of the internal CAN controller U2 is connected to the +3V power supply, the function pin 8#, ground pin 2#, and function pin 5# of the internal CAN controller U2 are all connected to GND, and the output pin 6# and output pin 7# of the internal CAN controller U2 are connected to the internal CAN bus.

6. The main control circuit for processing acoustic wave signals according to claim 5, characterized in that: It also includes an isolated power supply for power supply, which includes a low-voltage linear regulator U7. The +5V power supply is connected to the ground FGND through capacitors C1 and C2 respectively. The +5V power supply and FGND are respectively connected to the input pin 6# and the ground pin 4# of the low-voltage linear regulator U7. The enable pin 3# of the low-voltage linear regulator U7 is also connected to the ground FGND. The resistor R27 is respectively connected to the output pin 7# and the reference pin 2# of the low-voltage linear regulator U7. The reference pin 2# of the low-voltage linear regulator U7 is grounded through resistor R28. The output pin 7# of the low-voltage linear regulator U7 is connected to FGND through resistors C18 and C19.

7. The main control circuit for processing acoustic wave signals according to claim 1, characterized in that: The synchronization signal driving circuit includes a driver U11 and an amplifier U12A. The synchronization signal IN of the microcontroller is connected to the positive pole of the diode D1, the negative pole of the diode D1 is connected to the input pin 5# of the driver U11, the input pin 5# of the driver U11 is grounded to GND through the resistor R3, the input pin 5# of the driver U11 is connected to the negative pole of the diode D2, the positive pole of D2 is grounded to GND, the 2# and 7# of the driver U11 are connected to GND together, the output pin 12# of the driver U11 is connected to the positive input 3# of the amplifier U12A, and the negative input 2# of the amplifier U12A is directly connected to the output pin 1# of the amplifier U12A.

8. The main control circuit for processing acoustic wave signals according to claim 1, characterized in that: The microcontroller uses thick die circuit SM470R1B1MHKPS high temperature ARM7 as a processor, configured with 64K SARAM, built-in RAM and 1M flash memory.

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