CN110905490A - FPGA-based multi-pole while-drilling acoustic logging instrument excitation method and device - Google Patents
FPGA-based multi-pole while-drilling acoustic logging instrument excitation method and device Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 28
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- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/14—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves
- E21B47/16—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling using acoustic waves through the drill string or casing, e.g. by torsional acoustic waves
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Abstract
The invention belongs to a while-drilling acoustic logging technology, and particularly relates to a Field Programmable Gate Array (FPGA) -based multi-pole while-drilling acoustic logging instrument excitation method and device. The device comprises: the upper control machine is used for sending out a control command; the excitation circuit is used for analyzing a control command sent by the upper computer, generating a low-voltage excitation signal according to the analyzed control command after delaying for a certain time, and converting the low-voltage excitation signal into a high-voltage excitation signal to drive the transducer to generate a sound wave signal; and the transducer is used for converting the received high-voltage excitation electric signal into an outwardly radiated sound wave signal. And the upper control machine is respectively connected with the energy converter through an excitation circuit. The device can work under the resonance frequency of the monopole transducer and the quadrupole transducer, the radiated monopole and quadrupole acoustic signals have high precision and stronger energy, and the excitation mode is flexible and controllable.
Description
Technical Field
The invention belongs to a while-drilling acoustic logging technology, and particularly relates to a Field Programmable Gate Array (FPGA) -based multi-pole while-drilling acoustic logging instrument excitation method and device.
Background
As oil and gas exploration and development advance to complex reservoirs, horizontal wells and highly deviated wells are more widely applied, in order to control well tracks and enable drill bits to drill along the direction of the reservoirs, horizontal well logging and geosteering drilling are required, and cable logging instruments are time-consuming and labor-consuming and cannot be applied to unconventional well conditions. The acoustic logging while drilling technology can measure the longitudinal and transverse wave speeds of the stratum in the drilling process, indirectly obtain the pressure and geomechanical parameters of the stratum, realize the purposes of reservoir lithology identification, stratum overpressure detection, geosteering drilling and the like, and becomes an essential technical means for unconventional oil and gas exploitation. Compared with the conventional cable acoustic logging instrument, the acoustic logging-while-drilling instrument is greatly interfered by drilling tool noise, drilling fluid circulating noise and drill collar waves in the operation process, and the high-performance acoustic transmitting system can effectively improve the signal-to-noise ratio.
The acoustic wave transmitting system is one of the core structures of acoustic logging while drilling, and mainly comprises an exciting circuit and a transmitting transducer, wherein during logging operation, the exciting circuit generates a high-voltage pulse signal with certain frequency to drive the transducer to radiate an acoustic wave signal to a stratum, and the energy and frequency components of the signal directly influence whether an acquisition end can receive an effective stratum signal. For the current transmitting system of the acoustic logging while drilling instrument, the transmitting system mainly works in a monopole mode and a quadrupole mode. The monopole mode is used for measuring longitudinal and transverse wave information of a hard formation, the quadrupole mode is used for measuring transverse waves of a soft formation, and the drill collar waves in the quadrupole mode are weaker, so that the influence of direct waves of the drill collar is reduced.
Along with the continuous advance of China in the field of unconventional oil and gas field exploration, the importance of the acoustic logging-while-drilling instrument is increasingly prominent in the face of unconventional reservoirs with more complex geological environments, and an acoustic transmitting system which aims at high signal-to-noise ratio and diversification of the working modes of the instrument is a technical difficulty. The conventional acoustic wave while drilling instrument only has a monopole mode, and some instruments also realize a primary quadrupole mode by changing the phase of an excitation voltage. However, if the monopole transducer is made to realize quadrupole mode vibration under low frequency conditions, the quadrupole mode realized in this way is forced to vibrate instead of free vibration, and since the monopole transducer resonant frequency is about 13KHz and the quadrupole mode is operated near 3KHz, which is not at the monopole transducer resonant frequency, the excited quadrupole acoustic signal is weaker and the main frequency signal is still at the monopole mode frequency, resulting in unsatisfactory logging effect. While-drilling acoustic logging usually needs to control four tile-shaped transducers with 90-degree open angles to work, which requires that excitation signals have strict time sequence consistency, while a main control chip of a conventional while-drilling acoustic emission system adopts serial time sequence main control chips such as a DSP (digital signal processor), an ARM (advanced RISC machine) and the like, which causes time sequence errors of the excitation signals of the transducers, and external interfaces of the chips are not rich in a parallel time sequence chip FPGA (field programmable gate array), so that peripheral circuits are complicated, the volume of a circuit board is increased, and in order to realize positive and negative high-voltage excitation, a push-pull amplification circuit is usually adopted to synthesize positive and negative high voltages through a tap transformer, so that the volume of an excitation transformer is larger. And the conventional excitation circuit does not adopt an effective high-low voltage isolation technology, and the whole circuit board is easy to be punctured after the high-voltage module goes wrong, so that the whole transmitting system is paralyzed. Therefore, the safe and efficient multipole acoustic wave emission while drilling system has great practical significance.
Disclosure of Invention
In order to solve the problems, the invention aims to provide an FPGA-based multi-pole acoustic logging-while-drilling instrument transmitting system which realizes parallel time sequence control of excitation signals and adopts an isolation transformer to carry out high-voltage and low-voltage isolation technology, can efficiently work in a single-pole mode and a four-pole mode by adopting a mode of combining a monopole transducer and a quadrupole transducer, has continuously adjustable frequency, adjustable transmitting intervals and pulse number, and can freely switch the working mode according to actual needs.
The technical scheme of the invention is as follows: an FPGA-based multipole acoustic logging while drilling instrument stimulation device, the device comprising:
the upper control machine is used for sending out a control command;
the excitation circuit is used for analyzing a control command sent by the upper computer, generating a low-voltage excitation signal according to the analyzed control command after delaying for a certain time, and converting the low-voltage excitation signal into a high-voltage excitation signal to drive the transducer to generate a sound wave signal;
and the transducer group is used for converting the received high-voltage excitation electric signal into an outwardly radiated sound wave signal.
And the upper control machine is respectively connected with the energy converter through an excitation circuit.
Further, the transducer groups include a monopole mode transducer group and a quadrupole mode transducer group; the monopole mode transducer group comprises 4 monopole transducers, and the quadrupole mode transducer group comprises 4 quadrupole transducers;
and each monopole transducer of the monopole mode transducer group and each quadrupole transducer of the quadrupole mode transducer group are connected with the upper control machine through an excitation circuit.
Further, each monopole transducer of the monopole mode transducer group has the same excitation voltage phase; the excitation voltages between adjacent 2 groups of four-pole mode transducer groups are in opposite phase.
Further, the operating frequency of the monopole transducer is as follows: 10KHz-15 KHz; the working frequency of the quadrupole transducer is 2KHz-4KHz, the monopole transducer is suitable for hard strata, and the quadrupole transducer is suitable for soft strata.
Further, the excitation circuit comprises a control chip, a driving chip, a power amplification circuit, an energy storage capacitor, a high-voltage power supply and 2 isolation transformers;
the control chip is connected with one end of each of 2 isolation transformers through the driving chip, the other end of each of 2 isolation transformers is connected with the energy converter through a power amplification circuit, and the energy storage capacitor is connected with the power amplification circuit after being connected with the high-voltage power supply in parallel.
Further, the high-voltage power supply adopts a F M P10-15S400 chip which can provide 80V-450V continuously adjustable direct current high voltage; the driving chip is MCP 1407; the control chip adopts a parallel time sequence FPGA chip.
Further, the power amplifying circuit is an H bridge, and the H bridge comprises a step-up transformer and four same MOS tubes;
the four MOS tubes are alternately conducted and cut off pairwise, the primary two ends of the step-up transformer are respectively connected to the D poles of the two MOS tubes at the lower end of the H bridge, and the secondary of the step-up transformer is connected with the positive pole and the negative pole of the energy converter.
Another object of the present invention is to provide an excitation method of the excitation device, which specifically includes the following steps:
s1) the master control machine sends a master command to each excitation circuit,
s2) the excitation circuit generates a low-voltage excitation signal after delaying for 90-120 mus according to the received master control command, the low-voltage excitation signal is sent to the high-voltage module to generate a high-voltage excitation signal after passing through the isolation transformer,
s3) the transducer receives high-voltage excitation and then radiates sound wave signals with high consistency outwards, different main control commands are configured, and the working modes can be switched freely.
Further, the master command in S1) includes: excitation channel, frequency, transmission interval and number of pulses.
Further, the step S2) includes the following steps:
s2.1) the control chip generates a low-voltage control signal after analyzing the master control command and sends the low-voltage control signal to the driving chip, and the driving chip converts the low-voltage control signal into a driving signal;
and S2.2) transmitting the driving signal to an amplifying circuit through an isolation transformer for power amplification, controlling the discharge of a high-voltage power supply, controlling the H bridge to be controlled by a control signal, conducting alternately, generating a high-voltage excitation signal through a step-up transformer, and transmitting the high-voltage excitation signal to the transducer.
Further, the parameters of the step-up transformer are as follows: primary inductance: 863 muH-2.2 mH, secondary inductance 55mH-220mH, transformation ratio 1: 8-1:10. Ferrite, magnetic flux of 1.5T-2.0T, magnetic core size: the inner diameter is 12-20mm, the outer diameter is 48-38mm, and the height is 12-16 mm.
Further, S3) the excitation circuit can excite the transducers in parallel without time difference, the generated excitation signals ensure that the four groups of transducers radiate sound wave signals simultaneously, and the peak-to-peak value of the excitation voltage can reach 2000V.
The invention has the beneficial effects that: due to the adoption of the technical scheme, the invention has the following characteristics:
1. the device can work under the resonance frequency of a monopole transducer and a quadrupole transducer, the radiated monopole and quadrupole acoustic signals have high precision and stronger energy, and the excitation mode is flexible and controllable.
2. The master control chip of the excitation circuit adopts an FPGA chip with parallel time sequence, excitation signals have high consistency, time errors caused by traditional serial time sequence chips such as ARM, DSP and the like are greatly reduced, the excitation signals adopt pulse square waves and are amplified by MCP1407 to drive MOS tubes, and the circuit structure is simpler.
3. And an isolation transformer is adopted to isolate high voltage and low voltage, so that the safety of the system is guaranteed.
4. The power amplifying circuit adopts an H-bridge circuit consisting of four MOS tubes, works alternately in pairs, and can realize positive and negative high-voltage excitation by using a single-ended transformer.
Drawings
FIG. 1 is a schematic structural diagram of an excitation device of a multipole acoustic logging-while-drilling instrument based on an FPGA.
Fig. 2 is a schematic diagram of the excitation circuit of the present invention.
FIG. 3 is a schematic diagram of waveforms of FPGA control signals, (a)12KHz low-voltage control signals, and (b)3KHz low-voltage control signals.
FIG. 4 is a schematic diagram of the excitation waveforms of the transducer of the present invention, (a) being a monopole mode excitation waveform; (b) a quadrupole mode excitation waveform.
The specific implementation mode is as follows:
the technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, the excitation device for the Field Programmable Gate Array (FPGA) -based multi-pole acoustic logging while drilling instrument uses an excitation circuit with parallel time sequence control excitation signals and high and low voltage isolation technology by using an isolation transformer, so that an energy transducer group radiates acoustic signals with high consistency outwards, and different master control commands are configured, thereby freely switching the working modes.
The device comprises:
the upper control machine is used for sending out a control command;
the excitation circuit is used for analyzing the control command sent by the upper control machine, generating a low-voltage excitation signal according to the analyzed control command after delaying for a certain time, and converting the low-voltage excitation signal into a high-voltage excitation signal to drive the transducer to generate an acoustic signal;
the transducer group is used for converting the received high-voltage excitation electric signal into an outward radiated sound wave signal;
the upper control machine is respectively connected with the transducer groups through excitation circuits;
the transducers comprise a monopole mode transducer group and a quadrupole mode transducer group; the monopole mode transducer group comprises 4 monopole transducers, and the quadrupole mode transducer group comprises 4 quadrupole transducers;
and each monopole transducer of the monopole mode transducer group and each quadrupole transducer of the quadrupole mode transducer group are connected with the upper control machine through an excitation circuit.
Each monopole transducer of the monopole mode transducer group has the same excitation voltage phase; the excitation voltages between adjacent 2 groups of four-pole mode transducer groups are in opposite phase.
The working frequency of the monopole transducer is as follows: 10KHz-15 KHz; the working frequency of the quadrupole transducer is 2KHz-4KHz, the monopole transducer is suitable for hard strata, and the quadrupole transducer is suitable for soft strata.
As shown in fig. 2, the excitation circuit includes a control chip, a driving chip, a power amplification circuit, an energy storage capacitor, a high voltage power supply, and 2 isolation transformers;
the control chip is connected with one end of each of 2 isolation transformers through the driving chip, the other end of each of 2 isolation transformers is connected with the energy converter through a power amplification circuit, and the energy storage capacitor is connected with the power amplification circuit after being connected with the high-voltage power supply in parallel.
The high-voltage power supply adopts a F M P10-15S400 chip which can provide 80V-450V continuously adjustable direct-current high voltage; the driving chip is MCP 1407; the control chip adopts a parallel time sequence FPGA chip.
The power amplification circuit is an H bridge, and the H bridge comprises a step-up transformer and four same MOS tubes;
the four MOS tubes are alternately conducted and cut off pairwise, the primary two ends of the step-up transformer are respectively connected to the D poles of the two MOS tubes at the lower end of the H bridge, and the secondary of the step-up transformer is connected with the positive pole and the negative pole of the energy converter.
Another object of the present invention is to provide an excitation method of the excitation device, the method specifically includes the following steps:
s1) the master control machine sends a master command to each excitation circuit,
s2) the excitation circuit generates a low-voltage excitation signal after delaying for 90-120 mus according to the received master control command, the low-voltage excitation signal is sent to the high-voltage module to generate a high-voltage excitation signal after passing through the isolation transformer,
s3) the transducer receives high-voltage excitation and then radiates sound wave signals with high consistency outwards, different main control commands are configured, and the working modes can be switched freely.
Further, the master command in S1) includes: excitation channel, frequency, transmission interval and number of pulses.
The S2) concrete steps are:
s2.1) the control chip generates a low-voltage control signal after analyzing the master control command and sends the low-voltage control signal to the driving chip, and the driving chip converts the low-voltage control signal into a driving signal;
and S2.2) transmitting the driving signal to an amplifying circuit through an isolation transformer for power amplification, controlling the discharge of a high-voltage power supply, controlling the H bridge to be controlled by a control signal, conducting alternately, generating a high-voltage excitation signal through a step-up transformer, and transmitting the high-voltage excitation signal to the transducer.
S3), the excitation circuit can excite the transducers in parallel without time difference, the generated excitation signals ensure that the four groups of transducers radiate sound wave signals simultaneously, and the peak-to-peak value of the excitation voltage can reach 2000V.
Example (b):
a multipolar while-drilling acoustic logging instrument exciting device based on FPGA is connected in a mode shown in figure 1:
firstly, the upper computer sends a master control command, which comprises: excitation channel (monopole mode or quadrupole mode), frequency, transmission interval, number of pulses. The FPGA main control chip generates a 3.3V low-voltage control signal and transmits the low-voltage control signal to the MOS tube driving chip MCP1407 to be converted into a 15V MOS tube driving signal after delaying for 100 mu s, the isolation transformer is connected between the driving chip MCP1407 and the MOS tube in series, the 15V driving signal is transmitted to the MOS tube G pole driving MOS tube through the isolation transformer to be amplified, the high-voltage power supply is controlled to discharge, the H bridge is controlled by the control signal to be alternately conducted, and a peak-to-peak 2000V high-voltage excitation signal is generated through the transmitting transformer and transmitted to the transducer.
The energy converter is excited by high voltage and then radiates sound wave signals outwards, different master control commands are configured, so that the working modes can be switched freely, the FPGA is a parallel time sequence chip, the four paths of excitation circuits can excite the energy converter in parallel without time difference, the generated excitation signals have high consistency, the sound wave signals radiated by the four energy converters at the same time are guaranteed, and the measuring error of an instrument is greatly reduced.
The excitation circuit schematic is shown in fig. 2:
the FPGA chip receives a master control command sent by an upper computer and outputs four paths of low-voltage pulse square wave signals according to different mode selections, if a single-pole sub mode is selected, then the signals are generated (TXA _ H1, TXA _ H2, TXA _ L1 and TXA _ L2), and if a single-pole sub mode is selected, the signals are generated (TXA _ H1, TXB _ H2, TXB _ L1 and TXB _ L2), TXA _ H1 and TXA _ H2 control two MOS tubes 1 and 2 at the upper end of an H bridge 1, TXA _ L1 and TXA _ L2 control two MOS tubes 3 and 4 at the lower end of the H bridge, TXB _ H1 and TXB _ H2 control two MOS tubes 5 and 6 at the upper end of the H bridge 2, and the signals are generated (TXB _ H3, 4, TXB _ H3 and TXB _ H588 control two MOS tubes at the lower end of the H2. The 3.3V low-voltage signal is transmitted to the MOS tube driving chip MCP1407 to be changed into a 15V signal, the isolation transformer is connected between the driving chip MCP1407 and the MOS tube in series, and the MOS tube is driven to amplify power after being transmitted by the isolation transformer. The high-voltage power supply adopts F mu P10-15S400, the chip can provide 80V-450V continuously adjustable direct-current high voltage to supply power to the energy storage capacitor, and the MOS tube is conducted and cut off to control the discharge of the high-voltage power supply. The power amplification circuit adopts an H bridge and consists of four same MOS tubes, the model selects SPB17N80C3, and taking a single-pole transducer excitation mode as an example, firstly, the MOS1 is conducted with the MOS4, the MOS2 and the MOS3 are cut off, then, the MOS2 and the MOS3 are conducted, the MOS1 is cut off with the MOS4, the four MOS tubes are conducted and cut off alternately in pairs, the primary two ends of the step-up transformer are respectively connected with the D poles of the two MOS tubes at the lower end of the H bridge, and the secondary connected transducer generates a positive and negative 2000V high-voltage excitation signal to drive the transducer to work.
As shown in fig. 3, the monopole transducer resonant frequency is 12KHz and the quadrupole transducer resonant frequency is 3KHz in this embodiment, so that low voltage control signals are generated by the FPGA at their resonant frequencies, respectively, and in the monopole mode, for example, during high levels of the TXA _ H1 and TXA _ L1 signals, MOS transistor 1 and MOS transistor 4 of the H-bridge 1 are turned on and MOS transistor 2 and MOS transistor 3 are turned off, and during high levels of the TXA _ H2 and TXA _ L2 signals, MOS transistor 2 and MOS transistor 3 of the H-bridge are turned on and MOS transistor 1 and MOS transistor 4 are turned off, and the signal logic of the quadrupole mode is the same.
The final excitation waveform is shown in fig. 4, and the peak-to-peak value of the excitation voltage of the acoustic logging-while-drilling instrument excitation system of the invention basically reaches 2000V in both a monopole mode and a quadrupole mode.
The excitation method and device for the multipole acoustic logging-while-drilling instrument based on the FPGA are described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in this specification and the appended claims, certain terms are used to refer to particular components, and various names may be used by a manufacturer of hardware to refer to a same component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. The Field Programmable Gate Array (FPGA) -based multi-pole while-drilling acoustic logging instrument exciting device is characterized in that an exciting circuit with parallel time sequence control exciting signals and a high-voltage and low-voltage isolation technology by adopting an isolation transformer is utilized, so that an energy transducer group radiates acoustic signals with high consistency outwards, different main control commands are configured, and the working modes can be freely switched.
2. The tool stimulation apparatus of claim 1, wherein the apparatus comprises:
the upper control machine is used for sending out a control command;
the excitation circuit is used for analyzing the control command sent by the upper control machine, generating a low-voltage excitation signal according to the analyzed control command after delaying for a certain time, and converting the low-voltage excitation signal into a high-voltage excitation signal to drive the transducer to generate an acoustic signal;
the transducer group is used for converting the received high-voltage excitation electric signal into an outward radiated sound wave signal;
the upper control machine is respectively connected with the transducer groups through excitation circuits;
the transducers comprise a monopole mode transducer group and a quadrupole mode transducer group; the monopole mode transducer group comprises 4 monopole transducers, and the quadrupole mode transducer group comprises 4 quadrupole transducers;
and each monopole transducer of the monopole mode transducer group and each quadrupole transducer of the quadrupole mode transducer group are connected with the upper control machine through an excitation circuit.
3. The excitation device of claim 2, wherein each monopole transducer excitation voltage of the monopole mode transducer group is the same phase; the excitation voltages between adjacent 2 groups of four-pole mode transducer groups are in opposite phase.
4. Excitation device according to claim 3, characterized in that the operating frequency of the monopole transducer is: 10KHz-15 KHz; the working frequency of the quadrupole transducer is 2KHz-4KHz, the monopole transducer is suitable for hard strata, and the quadrupole transducer is suitable for soft strata.
5. The excitation device according to claim 4, wherein the excitation circuit comprises a control chip, a driving chip, a power amplification circuit, an energy storage capacitor, a high-voltage power supply and 2 isolation transformers;
the control chip is connected with one end of each of 2 isolation transformers through the driving chip, the other end of each of 2 isolation transformers is connected with the energy converter through a power amplification circuit, and the energy storage capacitor is connected with the high-voltage power supply in parallel and then connected with the power amplification circuit in series.
6. The excitation device as claimed in claim 5, wherein the high voltage power supply adopts F M P10-15S400 chip, the F M P10-15S400 chip provides 80V-450V continuously adjustable DC high voltage; the driving chip is MCP 1407; the control chip is a parallel time sequence FPGA chip.
7. The excitation device according to claim 5, wherein the power amplification circuit is an H-bridge, and the H-bridge comprises a step-up transformer and four identical MOS tubes;
the four MOS tubes are alternately conducted and cut off pairwise, the primary two ends of the step-up transformer are respectively connected to the D poles of the two MOS tubes at the lower end of the H bridge, and the secondary of the step-up transformer is connected with the positive and the negative of the energy converter.
8. Method for actuating a device according to any of claims 1 to 7, characterized in that it comprises in particular the following steps:
s1) the master control machine sends a master command to each excitation circuit,
s2) the excitation circuit generates a low-voltage excitation signal after delaying for 90-120 mus according to the received master control command, the low-voltage excitation signal is sent to the high-voltage module to generate a high-voltage excitation signal after passing through the isolation transformer,
s3) the transducer receives high-voltage excitation and then radiates sound wave signals with high consistency outwards, different main control commands are configured, and the working modes can be switched freely.
9. The excitation method according to claim 7, wherein the step S2) is specifically:
s2.1) the control chip generates a low-voltage control signal after analyzing the master control command and sends the low-voltage control signal to the driving chip, and the low-voltage control signal of the driving chip is converted into a driving signal;
and S2.2) transmitting the driving signal to an amplifying circuit through an isolation transformer for power amplification, controlling the discharge of a high-voltage power supply, controlling the H bridge to be controlled by a control signal, conducting alternately, generating a high-voltage excitation signal through a step-up transformer, and transmitting the high-voltage excitation signal to the transducer.
10. The excitation method as claimed in claim 8, wherein S3) the excitation circuit is capable of exciting the transducers in parallel without time difference, generating the excitation signals to ensure the acoustic signals radiated by the four sets of transducers simultaneously, and the peak-to-peak value of the excitation voltage is up to 2000V.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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