Acoustic wave transducer high-power drive circuit

Abstract

The utility model discloses a high-power driving circuit of an acoustic transducer, which comprises a differential bridge, a translation amplifying circuit, an analog-to-digital conversion circuit, a microcontroller, a transducer driving circuit, a CAN (Controller Area Network) communication circuit, a power supply filter circuit, a power supply monitoring circuit and a high-temperature oscillation circuit which are electrically connected, the input end of the differential bridge is connected with a TEMP + pin and a TEMP-pin, the output end of the differential bridge is connected with the input end of the translation amplification circuit, the output end of the translation amplification circuit is connected with the input end of the analog-to-digital conversion circuit, analog signals can be quickly and accurately converted into digital signals through the analog-to-digital conversion circuit, the power state can be quickly and accurately obtained, and the reliability of the power supply can be improved. A traditional method of transmitting analog signals to the ground is replaced, and distortion and noise of the signals in the transmission process are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of acoustic wave well logging, in particular to a high-power driving circuit for an acoustic wave transducer. 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 transmits the entire acoustic wave train to the surface, where the surface logging system calculates the amplitude of the first wave. This method, which requires the acoustic wave signal to pass through the cable core during transmission, results in significant amplitude attenuation, a low signal-to-noise ratio, large errors in the measured acoustic wave amplitude, and severe acoustic signal distortion. Utility Model Content

[0005] In order to solve the above problem, the utility model provides a high-power driving circuit for an acoustic wave transducer to solve the problem.

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

[0007] A high-power drive circuit for an acoustic wave transducer includes an electrically connected differential bridge, a translation amplifier circuit, an analog-to-digital conversion circuit, a microcontroller, a transducer drive circuit, a CAN communication circuit, a power supply filter circuit, a power supply monitoring circuit, and a high-temperature oscillation circuit. The input end of the differential bridge is connected to a TEMP+ pin and a TEMP- pin, the output of the differential bridge is connected to the input of the translation amplifier circuit, and the output of the translation amplifier circuit is connected to the input of the analog-to-digital conversion circuit.

[0008] It is further configured as follows: the analog-to-digital conversion circuit includes a voltage reference circuit and a high-speed ADC, and the output of the voltage reference circuit is connected to the input of the high-speed ADC, the output of the translation amplifier circuit is connected to another input of the high-speed ADC, and the high-speed ADC and the microcontroller are connected via a bus.

[0009] It is further configured as follows: the transducer driving circuit is composed of a level conversion circuit, a pulse width protection circuit, an energy storage circuit, and a high-voltage driving circuit that are electrically connected.

[0010] It is further configured as follows: the microcontroller and the level conversion circuit are connected through an IO port, the output of the pulse width protection circuit is connected to the input of the level conversion circuit, the output of the energy storage circuit is connected to the input of the high-voltage drive circuit, and the output of the high-voltage drive circuit is provided with a FIR+ pin and a FIR- pin.

[0011] It is further configured as follows: the level conversion circuit is composed of a current limiting resistor R28 and a voltage converter U8.

[0012] It is further configured as follows: the pulse width protection circuit includes a monostable controller consisting of a CD74HC221 multivibrator U11A, a resistor R37, and a capacitor C14, and the pulse width is controlled to be output to the 2# and 15# pins of the voltage converter U8 through the 13# pin of the multivibrator U11A.

[0013] It is further configured as follows: the energy storage circuit is composed of a diode D1, a diode D2, a high-voltage tantalum capacitor C1, a high-voltage tantalum capacitor C2, a high-voltage tantalum capacitor C3, a balancing resistor R3, a balancing resistor R64, and a balancing resistor R65; the high-voltage power supply input HVIN is charged to the high-voltage tantalum capacitor C1, the high-voltage tantalum capacitor C2, and the high-voltage tantalum capacitor C3 through the cathode input of the diode D1, the balancing resistor R3, the balancing resistor R64, and the balancing resistor R65 are respectively connected in parallel to the high-voltage tantalum capacitor C1, the high-voltage tantalum capacitor C2, and the high-voltage tantalum capacitor C3, the anode pin of the diode D1 is connected to the anode pin of the diode D2, and the lead wire serves as the output OUT1 of the energy storage circuit, and the cathode pin of the diode D2 serves as the output loop OUT2 of the energy storage circuit.

[0014] It is further configured as follows: the high-voltage drive circuit is composed of an IGBT tube Q1, a resistor R1, a resistor R2, a capacitor C24, and a diode D3; the control signal IN is input through one end of the resistor R1, connected to the capacitor C24 and the resistor R2 through the other end of the resistor R1, and enters the pin G of the IGBT control after being divided by the resistors R1 and R2; the two pins of the diode D3 are respectively connected to the B pole and the S pole of the IGBT tube Q1.

[0015] It is further configured as follows: the CAN communication circuit includes an isolated power supply and an external CAN controller, wherein the isolated power supply is electrically connected to the external CAN controller and the microcontroller, and the external CAN controller is electrically connected to the microcontroller.

[0016] It is further configured as follows: the power supply filter circuit includes a high-voltage power supply and a low-voltage power supply connected to the voltage monitoring circuit, and the high-voltage power supply is electrically connected to the high-voltage drive circuit at the same time.

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

[0018] The utility model can quickly and accurately convert analog signals into digital signals through the analog-to-digital conversion circuit, quickly and accurately obtain the power status, replace the traditional method of transmitting analog signals to the ground, and reduce signal distortion and noise during transmission.

[0019] The transducer driver circuit, consisting of a level conversion circuit, a pulse width protection circuit, an energy storage circuit, and a high-voltage drive circuit, converts the microcontroller's control signal into a voltage suitable for driving the transducer. The energy storage circuit also stores and rapidly releases energy to achieve electroacoustic conversion. Furthermore, it includes protection mechanisms to prevent damage to the transducer from sudden voltage fluctuations or overcurrent, ensuring stable signal transmission and precise control in harsh environments, thereby guaranteeing efficient and reliable operation of the entire acoustic logging system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 This is a schematic diagram of an application scenario of the present utility model;

[0022] Figure 2 This is the internal connection principle diagram of the utility model;

[0023] Figure 3 This is a circuit diagram of the level conversion circuit and pulse width protection circuit of the utility model;

[0024] Figure 4 A circuit diagram of the energy storage circuit and high-voltage drive circuit of the utility model;

[0025] Figure 5 It is a schematic diagram of the appearance of the utility model. DETAILED DESCRIPTION

[0026] 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.

[0027] 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. Example

[0028] Reference Figure 1-Figure 5 , which is a high-power driving circuit for an acoustic wave transducer disclosed in the utility model, includes a differential bridge, a translation amplifier circuit, an analog-to-digital conversion circuit, a microcontroller, a transducer driving circuit, a CAN communication circuit, a power supply filtering circuit, a power supply monitoring circuit, and a high-temperature oscillation circuit.

[0029] The input end of the differential bridge is connected to the TEMP+ pin and the TEMP- pin, the output of the differential bridge is connected to the input of the translation amplifier circuit, and the output of the translation amplifier circuit is connected to the input of the analog-to-digital conversion circuit.

[0030] The analog-to-digital conversion circuit includes a voltage reference circuit and a high-speed ADC, wherein the output of the voltage reference circuit is connected to the input of the high-speed ADC, the output of the translation amplifier circuit is connected to another input of the high-speed ADC, and the high-speed ADC is connected to the microcontroller via a bus;

[0031] The transducer drive circuit is composed of an electrically connected level conversion circuit, a pulse width protection circuit, an energy storage circuit, and a high-voltage drive circuit;

[0032] The microcontroller and the level conversion circuit are connected through an IO port, the output of the pulse width protection circuit is connected to the input of the level conversion circuit, the output of the energy storage circuit is connected to the input of the high-voltage drive circuit, and the output of the high-voltage drive circuit is provided with a FIR+ pin and a FIR- pin;

[0033] Reference Figure 3 The level conversion circuit consists of a current-limiting resistor R28 and a CD40109 voltage converter U8. The control signal enters the IGBT control terminal through output pin 11 of voltage converter U8 and current-limiting resistor R28. The pulse width protection circuit includes a monostable controller consisting of a CD74HC221 multivibrator U11A, resistor R37, and capacitor C14. The pulse width control is output through pin 13 of multivibrator U11A to pins 2 and 15 of voltage converter U8.

[0034] Reference Figure 4The energy storage circuit consists of a diode D1, a diode D2, a high-voltage tantalum capacitor C1, a high-voltage tantalum capacitor C2, a high-voltage tantalum capacitor C3, a balancing resistor R3, a balancing resistor R64, and a balancing resistor R65; the high-voltage power supply input HVIN charges the high-voltage tantalum capacitor C1, the high-voltage tantalum capacitor C2, and the high-voltage tantalum capacitor C3 through the cathode input of the diode D1, and the balancing resistor R3, the balancing resistor R64, and the balancing resistor R65 are respectively connected in parallel at both ends of the high-voltage tantalum capacitor C1, the high-voltage tantalum capacitor C2, and the high-voltage tantalum capacitor C3 to balance the capacitor voltage. The anode pin of the diode D1 is connected to the anode pin of the diode D2, and the lead wire serves as the output OUT1 of the energy storage circuit, and the cathode pin of the diode D2 serves as the output loop OUT2 of the energy storage circuit. The high-voltage drive circuit consists of IGBT tube Q1, diode D1, resistor R1, resistor R2, capacitor C24, and diode D3. The control signal IN is input through one end of resistor R1, and connected to capacitor C24 and resistor R2 through the other end of resistor R1. After being divided by resistors R1 and R2, it enters the IGBT control pin G. The two pins of diode D3 are respectively connected to the B pole and S pole of IGBT tube Q1, thereby converting the control signal IN into a high-voltage control signal.

[0035] The CAN communication circuit includes an isolated power supply and an external CAN controller, wherein the isolated power supply is electrically connected to the external CAN controller and the microcontroller, and the external CAN controller is electrically connected to the microcontroller;

[0036] Furthermore, the CAN communication circuit is implemented using a high-temperature CAN communication chip with the model SN65HV diode D233SHKJ. The microcontroller uses a high-temperature ARM7 with the model SM470 resistor R1B1MHKPS as the processor, configured with 64K SARAM, built-in RAM and 1M flash memory, 60M main frequency, 16 / 32-bit RISC core to realize the module's analog-to-digital conversion, PWM control and data processing functions.

[0037] The power supply filter circuit includes a high-voltage power supply and a low-voltage power supply connected to the voltage monitoring circuit, and the high-voltage power supply is also electrically connected to the high-voltage driving circuit.

[0038] The working principle and beneficial effects of the utility model are as follows:

[0039] After being processed by the power filter circuit, the power supply directly powers the microcontroller. The microcontroller achieves data communication through a direct connection with the CAN communication circuit and interacts with the analog-to-digital conversion circuit to receive and process analog signals from the power monitoring circuit. Specifically, the high-speed ADC can quickly and accurately convert analog signals into digital signals, quickly and accurately obtaining the power status, replacing the traditional method of transmitting analog signals to the ground, reducing signal distortion and noise during transmission. At the same time, the microcontroller also directly controls the transducer drive circuit and adjusts the sound wave output, thereby improving signal quality, ultimately realizing a complete process from power input to sound wave output.

[0040] Furthermore, the transducer driver circuit, consisting of a level conversion circuit, a pulse width protection circuit, an energy storage circuit, and a high-voltage drive circuit, converts the microcontroller's control signal into a voltage suitable for driving the transducer. The energy storage circuit also stores and rapidly releases energy to achieve electroacoustic conversion. Furthermore, it includes protection mechanisms to prevent damage to the transducer from sudden voltage changes or overcurrent, ensuring stable signal transmission and precise control in harsh environments, thereby guaranteeing the efficient and reliable operation of the entire acoustic logging system.

[0041] 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 high-power driving circuit for an acoustic wave transducer, characterized in that: It includes an electrically connected differential bridge, a translation amplifier circuit, an analog-to-digital conversion circuit, a microcontroller, a transducer drive circuit, a CAN communication circuit, a power supply filter circuit, a power supply monitoring circuit, and a high-temperature oscillation circuit. The input end of the differential bridge is connected to the TEMP+ pin and the TEMP- pin, the output of the differential bridge is connected to the input of the translation amplifier circuit, and the output of the translation amplifier circuit is connected to the input of the analog-to-digital conversion circuit.

2. The high-power driving circuit for an acoustic wave transducer according to claim 1, characterized in that: The analog-to-digital conversion circuit includes a voltage reference circuit and a high-speed ADC, and the output of the voltage reference circuit is connected to the input of the high-speed ADC, the output of the translation amplifier circuit is connected to another input of the high-speed ADC, and the high-speed ADC is connected to the microcontroller via a bus.

3. A high-power driving circuit for an acoustic wave transducer according to claim 2, characterized in that: The transducer driving circuit is composed of a level conversion circuit, a pulse width protection circuit, an energy storage circuit, and a high-voltage driving circuit that are electrically connected.

4. A high-power driving circuit for an acoustic wave transducer according to claim 3, characterized in that: The microcontroller is connected to the level conversion circuit through an IO port, the output of the pulse width protection circuit is connected to the input of the level conversion circuit, the output of the energy storage circuit is connected to the input of the high-voltage drive circuit, and the output of the high-voltage drive circuit is provided with a FIR+ pin and a FIR- pin.

5. The high-power driving circuit for an acoustic wave transducer according to claim 3, characterized in that: The level conversion circuit consists of a current limiting resistor R28 and a voltage converter U8.

6. A high-power driving circuit for an acoustic wave transducer according to claim 5, characterized in that: The pulse width protection circuit includes a monostable controller composed of a CD74HC221 multivibrator U11A, a resistor R37, and a capacitor C14. The pulse width is controlled and output to the 2# and 15# pins of the voltage converter U8 through the 13# pin of the multivibrator U11A.

7. The high-power driving circuit for an acoustic wave transducer according to claim 6, characterized in that: The energy storage circuit is composed of a diode D1, a diode D2, a high-voltage tantalum capacitor C1, a high-voltage tantalum capacitor C2, a high-voltage tantalum capacitor C3, a balancing resistor R3, a balancing resistor R64, and a balancing resistor R65; the high-voltage power input HVIN is charged to the high-voltage tantalum capacitor C1, the high-voltage tantalum capacitor C2, and the high-voltage tantalum capacitor C3 through the cathode input of the diode D1, the balancing resistor R3, the balancing resistor R64, and the balancing resistor R65 are respectively connected in parallel to the high-voltage tantalum capacitor C1, the high-voltage tantalum capacitor C2, and the high-voltage tantalum capacitor C3. The anode pin of the diode D1 is connected to the anode pin of the diode D2, and the lead wire serves as the output OUT1 of the energy storage circuit. The cathode pin of the diode D2 serves as the output loop OUT2 of the energy storage circuit.

8. The high-power driving circuit for an acoustic wave transducer according to claim 7, characterized in that: The high-voltage drive circuit consists of an IGBT tube Q1, a resistor R1, a resistor R2, a capacitor C24, and a diode D3. The control signal IN is input through one end of the resistor R1, connected to the capacitor C24 and the resistor R2 through the other end of the resistor R1, and enters the pin G of the IGBT control after being divided by the resistors R1 and R2. The two pins of the diode D3 are respectively connected to the B pole and the S pole of the IGBT tube Q1.

9. The high-power driving circuit for an acoustic wave transducer according to claim 1, characterized in that: The CAN communication circuit includes an isolated power supply and an external CAN controller, wherein the isolated power supply is electrically connected to the external CAN controller and the microcontroller, and the external CAN controller is electrically connected to the microcontroller.

10. The high-power driving circuit for an acoustic wave transducer according to claim 1, characterized in that: The power supply filter circuit includes a high-voltage power supply and a low-voltage power supply connected to the voltage monitoring circuit, and the high-voltage power supply is also electrically connected to the high-voltage driving circuit.

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