High-power pulse electromagnetic sound source system with high repetition frequency and use method thereof

Abstract

The invention discloses a high-power pulse electromagnetic sound source system with high repetition frequency and a use method thereof, and the system mainly consists of an energy storage battery, a boost module, a distributed cascade Marx module, a control module, a full-bridge load module and a distributed electromagnetic transducer. The pulse sound source system has the advantages of various functions, strong interaction capability, high power, high repetition frequency, wide sound source propagation range, intelligence, reliability and the like, and provides technical support for pulse sound source research while ensuring portability and economy.

Description

Technical Field

[0001] The present invention relates to the fields of high-voltage pulse power technology and acoustics, and particularly to a high-power pulsed electromagnetic sound source system with a high repetition frequency and a method for using the same. Background Art

[0002] The ocean contains extremely rich strategic resources such as minerals, chemistry, and biology. Ocean development has become a strategic consensus in the world economic development. In the special environment of the ocean, only sound waves can carry information and transmit it over long distances. Underwater sound source technology has become an important scientific and technological foundation for ocean development. Underwater communication, ocean exploration, and resource development all rely on the development of underwater sound sources. The electromagnetic pulsed sound source is a type of underwater broadband sound source. By using a high-voltage pulse to excite a distributed electromagnetic transducer, a high-power pulsed wave can be generated by the transducer. The pulsed wave has a wide frequency band range, rich sound source information, and strong penetration ability, and has unique advantages in marine resource exploration and marine geological surveys. Therefore, studying electromagnetic pulsed sound source technology is of great significance for the development of the ocean cause.

[0003] The electromagnetic pulsed sound source is an electro-magnetic-mechanical-acoustic energy conversion system. The generation process of the electromagnetic sound source is mainly divided into two stages: The first stage is the conversion of electrical energy into mechanical energy. The pulse unit generates a high-power high-voltage pulse under artificial control, inputs electrical energy into the coil, forms a closed magnetic circuit inside the transducer, excites an alternating magnetic field, and under the action of the magnetic field, an electromagnetic force is generated on the armature, driving the vibration of the emission plate surface. The second stage is the conversion of mechanical energy into acoustic energy. The emission plate surface continuously vibrates, interacts with the surrounding water medium, and forms a pulsed sound wave to radiate sound field energy outward.

[0004] However, there is less research on underwater sound sources at home and abroad, especially on electromagnetic pulsed sound sources. Some solutions still use drive methods with low reliability such as gas spark switches and liquid switches. At the same time, the structure of the electromagnetic transducer is also relatively traditional, with high power consumption and a small propagation range. The Chinese invention patent with the publication number CN 102890928B discloses a pulsed electromagnetic sound source including a pulsed sound source housing, a pulsed capacitor, a trigger system, an emission unit, a first constant-current charging power supply, a second constant-current charging power supply, and a control circuit, which has advantages such as a high working voltage, a large discharge current, and a high sound source level. However, this invention uses a vacuum trigger tube as the discharge switch, which has disadvantages such as large pulse jitter, large power loss, limited service life, poor reliability, and inability to monitor the discharge situation. In addition, due to the inductive load characteristic of the electromagnetic transducer, during the pulsed discharge process, there will be a current tail of more than ten milliseconds or even dozens of milliseconds due to the inductive load characteristic, which will greatly affect the repetition frequency of the distributed electromagnetic transducer to emit waves, restricting the diversification of the sound source. In response to the above problems, the present invention will make a targeted optimization design. Summary of the Invention

[0005] To solve the above technical problems, the present invention proposes a high-repetition-frequency high-power pulsed electromagnetic sound source system and its usage method.

[0006] The object of the present invention is achieved by the following technical solutions:

[0007] A high-repetition-frequency high-power pulsed electromagnetic sound source system includes a distributed electromagnetic transducer, and three distributed E-type excitation stacks are uniformly installed along the axial direction inside the distributed electromagnetic transducer; the distributed E-type excitation stacks are electrically connected to a full-bridge load module, the full-bridge load module is electrically connected to a distributed cascaded Marx module, the distributed cascaded Marx module is electrically connected to a pulse synchronization drive circuit and a boost rectification circuit; the boost rectification circuit is electrically connected to a power supply and an inverter drive and protection circuit, and both the pulse synchronization drive circuit and the inverter drive and protection circuit are electrically connected to a control module;

[0008] The electric energy output by the power supply is boosted and rectified by the boost rectification circuit, and then cascaded and multiplied by the distributed cascaded Marx module to generate a high-voltage pulse. The high-voltage pulse is bipolarity-adjusted by the full-bridge load module and then acts on the three distributed E-type excitation stacks of the distributed electromagnetic transducer. The three distributed E-type excitation stacks respectively generate magnetic fields under pulse excitation, generate electromagnetic forces to drive the radiation plate to vibrate, and emit a sound field outward.

[0009] For further improvement, the control module includes a display screen, and the display screen is communicatively connected to a DSP+FPGA core control board; the DSP+FPGA core control board includes a DSP and an FPGA; the front end of the DSP is communicatively connected to the display screen to realize system start / stop, status display and intelligent adjustment of pulse parameters. The back end of the DSP controls the inverter drive and protection circuit and samples the output voltage and current signals to realize closed-loop control; the front end of the FPGA realizes UART communication with the DSP to transmit data information, and the back end is electrically connected to the pulse synchronization drive circuit to control the operation of the Marx pulse circuit in the corresponding distributed cascaded Marx module.

[0010] For further improvement, the distributed cascaded Marx module includes three Marx pulse circuits. One end of each of the three Marx pulse circuits is electrically connected to a distributed E-type excitation stack, and the other end is electrically connected to a pulse synchronization drive circuit.

[0011] For further improvement, the distributed electromagnetic transducer includes a cylindrical electromagnetic shielding housing. Inside the electromagnetic shielding housing, three E-shaped excitation stacks arranged in a triangular distribution are installed. Coils are wound around the E-shaped excitation stacks. An armature is located directly above the E-shaped excitation stack, and an air gap is formed between the E-shaped excitation stack and the armature. The top of the armature is fixed to the lower surface of the radiation plate. Under the bipolar pulse excitation provided by the full-bridge load module to the coil, the E-shaped excitation stack forms a closed magnetic circuit with the air gap and the armature respectively, generating an electromagnetic force to drive the vibration of the radiation plate surface. The vibrating plate radiates sound field energy to the outside. Its distributed excitation structure can reduce the inductance of the overall electromagnetic transducer, prevent the saturation of the E-shaped excitation stack, and while obtaining a greater electromagnetic force, reduce the current tailing.

[0012] The radiation plate is a metal sheet made of aluminum alloy and is fixed by rubber sealing;

[0013] The armature is stacked by silicon steel sheets;

[0014] The E-shaped excitation stack is stacked by multiple E-shaped silicon steel sheets, and the coil is wound around the silicon steel sheets in a clockwise direction.

[0015] For further improvement, the display screen is a capacitive touch HMI serial port screen, model TJC4827X343_011X, and is connected to the DSP through RS485 communication for monitoring and controlling the electromagnetic pulse sound source driving device. The display screen interface includes output status display, device start / stop button, pulse width and repetition frequency adjustment, and warning prompt;

[0016] The chip model of the DSP is TMS320f28379D, which has 800 MIPS, 2 CPUs, and 2 CLAs, and is connected to the display screen for communication to realize the intelligent control of the pulse sound source system, including a first communication unit, a data processing unit, and a sampling unit;

[0017] The first communication unit includes RS485 and RS232 interfaces, which communicate with the display screen and the FPGA respectively;

[0018] The sampling unit includes an internal ADC sampling module of the DSP, which is used to obtain the output feedback signals of the boost rectification circuit and the distributed cascaded Marx module as sampling signals and transfer the information to the data processing unit;

[0019] The data processing unit is used for the calculation and processing of the display screen control signal and the sampling signal.

[0020] For further improvement, the model of the FPGA is EP4CE10F17C8, which has 10k logic cells and 414kbit of embedded RAM resources. It receives the control signals generated by the DSP and realizes the driving and protection functions according to the instructions. It internally includes a second UART communication unit, a pulse signal generation unit, and an overcurrent protection unit;

[0021] The second UART communication unit includes an RS232 interface and realizes the communication between the FPGA and the DSP through a serial cable;

[0022] The pulse signal generation unit generates a delay signal based on DDS technology and cooperates with the DSP to realize the adjustment of signal parameters;

[0023] The overcurrent protection unit judges and processes the sampling data of the DSP to protect the Marx pulse generator from overcurrent and ensure the stable operation of the system;

[0024] The driving and protection circuit includes an inverter driving and protection circuit and a pulse synchronization driving circuit;

[0025] The inverter driving and protection circuit includes an IR2110S driving chip. The IR2110S driving chip amplifies the control signals generated by the DSP and acts on the full-bridge inverter circuit of the boost rectifier circuit to drive it to work normally;

[0026] The pulse synchronization driving circuit includes a power amplification circuit based on an IXDN609 chip. The power amplification circuit based on the IXDN609 chip is electrically connected to an opto-isolation circuit based on an FR50MHIR chip. The opto-isolation circuit based on the FR50MHIR chip is used for the conversion between TTL signals and fiber optic signals, enabling better electrical isolation between the control circuit and the Marx pulse circuit, suppressing electromagnetic interference, and ensuring the stability of the trigger signal. The power amplification circuit based on the IXDN609 chip is used to receive the driving signals generated by the FPGA, amplify the signals, and drive the Marx pulse generator to realize the distributed driving function.

[0027] For further improvement, the Marx pulse circuit includes a plurality of single-stage networks; each single-stage network includes a fast-recovery diode D1. The negative electrode of the fast-recovery diode D1 is electrically connected to one end of an energy storage capacitor C1 and the drain of a first MOS transistor S1. The source of the first MOS transistor S1 is electrically connected to the drain of a second MOS transistor S2, and the source of the second MOS transistor S2 is electrically connected to the other end of the energy storage capacitor. The negative electrode of the fast-recovery diode D1 of the previous single-stage network is electrically connected to the positive electrode of the fast-recovery diode D1 of the next single-stage network; the source of the first MOS transistor S1 of the previous single-stage network is electrically connected to the source of the second MOS transistor S2 of the next single-stage network. The plurality of single-stage networks are charged in parallel and discharged in series with voltage multiplication to provide pulsed energy for a single E-type excitation stack in the distributed electromagnetic transducer, and radiate pulsed sound sources.

[0028] For further improvement, there are three full-bridge load modules, and each of the three full-bridge load modules is electrically connected to a coil 4 on an E-type excitation stack 5; the full-bridge load module includes an eleventh IGBT transistor S11, a twelfth IGBT transistor S12, a thirteenth IGBT transistor S13, and a fourteenth IGBT transistor S14. The collector of the eleventh IGBT transistor S11 is electrically connected to the collector of the fourteenth IGBT transistor S14; the emitter of the eleventh IGBT transistor S11 is electrically connected to the collector of the twelfth IGBT transistor S12 and one end of the coil 4. The emitter of the twelfth IGBT transistor S12 is electrically connected to the emitter of the thirteenth IGBT transistor S13, and the collector of the thirteenth IGBT transistor S13 is electrically connected to the other end of the coil 4 and the emitter of the fourteenth IGBT transistor S14;

[0029] The full-bridge load module changes the output characteristics of the Marx pulse. The Marx pulse circuit outputs two consecutive pulses. When the first pulse is output, the eleventh IGBT transistor S11 and the thirteenth IGBT transistor S13 are turned on, and the twelfth IGBT transistor S12 and the fourteenth IGBT transistor S14 are turned off, and the full-bridge load module outputs a positive-polarity pulse; when the second pulse is output, the eleventh IGBT transistor S11 and the thirteenth IGBT transistor S13 are turned off when the first pulse is output, and the twelfth IGBT transistor S12 and the fourteenth IGBT transistor S14 are turned on, and the full-bridge load circuit outputs a negative-polarity pulse. The current waveform flowing through the distributed electromagnetic transducer is controlled by bipolar pulses, and the current tail of the inductive load is reduced, thereby controlling the sound source characteristics of the distributed electromagnetic transducer.

[0030] For further improvement, it further includes an auxiliary power supply system for supplying power to the control system.

[0031] A method for using the above high-repetition-frequency high-power pulsed electromagnetic sound source system, characterized by including the following steps:

[0032] Step 1: Place the distributed electromagnetic transducer in water, adjust the state of the distributed electromagnetic transducer, connect the interconnection end to the display screen of the control module through the RS485 communication interface, and power on through the energy storage battery and the auxiliary power supply system;

[0033] Step 2: Based on the information on the display screen, determine whether the high-repetition-frequency high-power pulsed electromagnetic sound source system is in the ready-to-fire state, and fill in the pulse width and pulse repetition frequency;

[0034] Step 3: Through the display screen, press the start button to start the device. The distributed cascaded Marx module generates pulsed energy with high voltage and large current to excite the distributed electromagnetic transducer, radiate the sound field outward, and generate an electromagnetic pulsed sound source;

[0035] Step 4: Press the stop button on the display screen to stop wave emission;

[0036] Step 5: Disconnect the power supply, disconnect the connection line between the device and the electromagnetic transducer, and disconnect the display screen interface.

[0037] The beneficial effects of the present invention are as follows:

[0038] 1. The present invention is a high-power electromagnetic pulsed sound source system with adjustable pulse width and pulse repetition frequency. The system is portable, has excellent performance, simple operation, strong human-computer interaction ability, high repetition frequency, and efficient, intelligent, and diverse control methods.

[0039] 2. Through the full-bridge load module and the distributed electromagnetic transducer design scheme, the present invention improves the phenomenon of the inductive load discharge tail of the transducer, increases the repetition frequency of the pulsed sound source, and improves the current waveform.

[0040] 3. The present invention is equipped with an electromagnetic shielding shell, which reduces electromagnetic interference from multiple aspects while improving the stability of the system, and can adapt to the application environment of the electromagnetic pulsed underwater sound source. Description of the Drawings

[0041] The present invention is further described with reference to the accompanying drawings, but the content in the drawings does not constitute any limitation to the present invention.

[0042] Figure 1 is a schematic diagram of the overall structure of a high-repetition-frequency high-power pulsed electromagnetic sound source system;

[0043] Figure 2 is the DSP+FPGA control flow chart.

[0044] Figure 3 is a schematic diagram of the pulse synchronous drive circuit structure.

[0045] Figure 4 is a schematic diagram of the inverter drive protection circuit.

[0046] Figure 5 It is a schematic diagram of the boost module circuit.

[0047] Figure 6 It is a schematic diagram of the Marx pulse generator topology.

[0048] Figure 7 It is a schematic diagram of the full-bridge load module.

[0049] Figure 8 It is a schematic diagram of the output waveform of the full-bridge load module.

[0050] Figure 9 They are the current and electromagnetic force waveforms of the distributed electromagnetic transducer.

[0051] Figure 10 It is a schematic diagram of the structure of the distributed electromagnetic transducer (single E-type excitation stack).

[0052] Figure 11 It is a top view structure diagram of the distributed electromagnetic transducer. Specific embodiments

[0053] In order to make the purpose, technical solutions and advantages of the invention clearer, the following further details the present invention in conjunction with the accompanying drawings and examples.

[0054] The following will describe the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0055] The present invention is a high-repetition-frequency high-power pulsed electromagnetic sound source system, and its structural block diagram is as Figure 1 shown. A high-repetition-frequency high-power pulsed electromagnetic sound source system is characterized by including: a display screen, a DSP+FPGA core control board, a drive and protection circuit, an inverter circuit, an LCC resonance circuit, a high-frequency transformer, a rectifier circuit, a Marx pulse circuit, an energy storage battery, a full-bridge load module, and a distributed electromagnetic transducer. The energy storage battery releases electrical energy, which is processed through inversion, resonance, transformer boosting, and rectification, and then outputs 400VDC direct current to charge the energy storage capacitor of the Marx pulse generator. Under the drive of the control module, a high-voltage pulse is generated and acts on the distributed electromagnetic transducer. The three E-type excitation stacks of the distributed electromagnetic transducer respectively excite magnetic fields, generate electromagnetic forces to drive the radiation plate to vibrate, interact with the surrounding water medium, and radiate sound fields outward. The core of the control module is the DSP+FPGA control board. The front end of the DSP is connected to the touch display screen to realize system start / stop, status display, and intelligent adjustment of pulse parameters. The back end of the DSP controls the drive protection circuit and samples the output voltage and current signals to realize closed-loop control; the front end of the FPGA communicates with the DSP through UART to transmit data information. At the same time, it is connected to the pulse synchronization drive circuit through an optocoupler transceiver, and outputs drive signals respectively to control the operation of the Marx pulse generator, and at the same time forms good electrical isolation to maintain the stability of the system output.

[0056] The display screen is a capacitive touch HMI serial screen, model number TJC4827X343_011X, which is connected to the DSP control board through RS485 communication mode and is used to monitor and control the electromagnetic pulse sound source driving device. The display screen interface includes output status display, device start / stop button, pulse width and repetition frequency adjustment, and warning prompt;

[0057] The DSP+FPGA control flow chart is as shown in Figure 2 shown. The built-in chip model of the DSP control board is TMS320f28379D, which has 800MIPS, 2 CPUs, and 2 CLAs, and is connected to the display screen to realize the intelligent control of the pulse sound source system, including a communication unit, a data processing unit, and a sampling unit. The communication unit includes RS485 and RS232 interfaces, which communicate with the display screen and FPGA respectively; the sampling unit includes internal ADC sampling of the DSP, which is used to obtain the output feedback signals of the boost module and Marx module and transfer the information to the data processing unit; the data processing unit is used to calculate and process the display screen control signal and sampling signal. After receiving the display screen signal, the DSP generates corresponding pulse trigger signals through analysis and processing, and cooperates with the display screen to realize the adjustment of control signal parameters;

[0058] The built-in chip model of the FPGA core control board is EP4CE10F17C8, which has 10k logic units and 414kbit embedded RAM resources. It internally includes a UART communication unit, a pulse signal generation unit, and an overcurrent protection unit. After receiving the DSP signal, the FPGA generates corresponding pulse trigger signals through analysis and processing. The signals are converted into optical signals by the optical fiber transmitter and transmitted to the drive circuit module, and finally realize the drive and protection functions of the MOSFET switch tube. The communication unit includes an RS232 interface, which realizes the communication between the FPGA and the DSP device through a serial cable; the pulse signal generation unit generates a delay signal based on DDS technology and cooperates with the DSP to realize the adjustment of signal parameters.

[0059] The pulse synchronization drive circuit is as shown in Figure 3 shown, including a power amplification circuit based on IXDN609 and an opto-isolation circuit based on FR50MHIR. It receives the trigger signal generated by the control circuit through optical fiber transmission, converts the optical signal into a TTL signal, and drives the MOSFET switch tube to conduct and turn off after being amplified by the IXDN609 chip to control the operation of the Marx pulse generator. Optical fiber transmission enables better electrical isolation between the control circuit and the pulse circuit, suppresses electromagnetic interference, and ensures the stability of the trigger signal.

[0060] The inverter drive and protection circuit is as follows Figure 4 shown, including two parts: drive and sampling. The drive chip uses IR2110S, with a peak pull / sink current capacity of 4A, bootstrap boost, input TTL level, and an SD output lockout, where SD is active high. Based on the IR2110S drive chip, it amplifies the control signal generated by the DSP+FPGA control board to drive the half-bridge inverter circuit of the boost module to operate normally; the sampling chip AMC1200B realizes dual-channel isolated signal sampling. This chip has an 8-fold fixed gain and an input voltage range of ±250mV. It is used to collect the output feedback signal of the boost module, condition the signal, and then transfer it to the DSP control board. The DSP protection module controls the cut-off of the signal to ensure the stable operation of the protection circuit.

[0061] The schematic diagram of the boost module circuit is as follows Figure 5 shown, including a half-bridge inverter circuit, an LCC resonant circuit, a high-frequency boost transformer, and a diode rectifier circuit, which is used for DC-DC boost conversion and provides a stable constant current output. The half-bridge inverter circuit converts the input low-voltage DC into a high-frequency square wave and transfers it to the subsequent resonant converter. The resonant converter has the characteristic that the resonant impedance changes with the operating frequency. According to the frequency of the AC square wave, it is converted into an approximately sinusoidal AC voltage with a corresponding gain, and at the same time, soft-switching technology is realized to reduce the loss generated by the switching tube.

[0062] The full-bridge conversion circuit includes four MOS transistors. The source and drain of every two MOS transistors are connected, and the two groups are connected in series to form a full-bridge inverter circuit for DC inversion; the LCC resonant conversion circuit consists of a resonant network composed of an inductor and two capacitors. The three are connected in series, and one of the capacitors is connected in parallel with the boost transformer for voltage resonant conversion; for the boost transformer, its core material is ferrite of PC40 material, and 0.5mm enameled wire is selected as the wire to wind the transformer winding; the diode rectifier circuit includes four diodes, and the series-parallel two-fold voltage rectifier circuit topology is selected. The two neutral points of the two groups are connected to the output end of the transformer for rectifying the output of the transformer;

[0063] The schematic diagram of the working state of the Marx pulse generator is as follows Figure 6As shown in the figure, a multi-stage series network composed of energy storage capacitors, fast recovery diodes, and MOS transistors is presented. Each device needs to have high voltage and current withstand properties. Each single-stage network includes a fast recovery diode D1. The negative electrode of the fast recovery diode D1 is electrically connected to one end of the energy storage capacitor C1 and the drain of the first MOS transistor S1. The source of the first MOS transistor S1 is electrically connected to the drain of the second MOS transistor S2. The source of the second MOS transistor S2 is electrically connected to the other end of the energy storage capacitor. Among them, the negative electrode of the fast recovery diode D1 of the previous single-stage network is electrically connected to the positive electrode of the fast recovery diode D1 of the next single-stage network. The source of the first MOS transistor S1 of the previous single-stage network is electrically connected to the source of the second MOS transistor S2 of the next single-stage network. The multiple single-stage networks are charged in parallel and discharged in series with voltage multiplication to provide pulsed energy for a single E-type excitation stack in a distributed electromagnetic transducer, radiating pulsed sound sources. The Marx pulse generator is characterized in that it provides pulsed energy for a single E-type excitation stack in a distributed electromagnetic transducer by charging the single-stage networks in parallel and discharging them in series with voltage multiplication, radiating pulsed sound sources. During charging, the main switch is turned off and the auxiliary switch is turned on. The power supply forms a parallel circuit through the diode and the auxiliary switch to charge the energy storage capacitor. During discharging, the main switch is turned on and the auxiliary switch is turned off. The energy storage capacitors at all levels form a series circuit with the load, thereby obtaining a high-amplitude pulsed voltage.

[0064] The circuit diagram of the full-bridge load module is as Figure 7 shown, and it is composed of four IGBTs and a distributed electromagnetic transducer. The schematic diagram of its output waveform is as Figure 8 shown. The previous-stage Marx pulse generator will generate two consecutive pulsed square waves. When the first square wave is generated, the S11 and S13 transistors in the full-bridge load circuit are turned on, and the S12 and S14 transistors are turned off. The current flowing through the distributed electromagnetic transducer gradually increases with the voltage excitation. When the second square wave is generated, the S11 and S13 transistors in the full-bridge load circuit are turned off, and the S12 and S14 transistors are turned on. Under the excitation of the reverse pulsed voltage, the current in the distributed electromagnetic transducer gradually decreases. This structure avoids the phenomenon of long-time current tailing under inductive load conditions. The current waveform and electromagnetic force waveform of the distributed electromagnetic transducer are as Figure 9 shown.

[0065] The schematic structural diagram of a single E-type excitation stack of the distributed electromagnetic transducer is as Figure 10 shown, including: 1 radiation plate, 2 armature, 3 air gap, 4 coil, and 5 E-type excitation stack. The Marx pulse generator provides pulsed energy to the coil. The three distributed E-type excitation stacks respectively form a closed magnetic circuit with the spatial air gap and the armature, causing changes in the field strength, generating electromagnetic force, driving the vibration of the radiation plate, and the vibrating plate radiates sound field energy to the outside.

[0066] The radiation plate is a thin metal sheet made of aluminum alloy and is fixed by rubber sealing; the armature is stacked by silicon steel sheets; the E-shaped excitation stack is stacked by multiple E-shaped silicon steel sheets. The coil is wound around the silicon steel sheets in a clockwise direction. After the excitation current increases to a certain value, magnetic saturation is reached inside, the permeability increases while the eddy current loss is relatively low, effectively improving the acoustic emission efficiency. Its distributed excitation structure can reduce the inductance of the overall electromagnetic transducer, prevent the saturation of the E-shaped excitation stack, obtain a greater electromagnetic force while reducing the current tailing, and enrich the characteristics of the pulsed sound source.

[0067] The auxiliary power supply system consists of an auxiliary power supply and is used to supply power to the control system.

[0068] The high-repetition-rate high-power pulsed electromagnetic sound source system is characterized in that: electrical energy is supplied to the energy storage capacitor of the Marx pulse generator through the pulse module. Under the control of the control module, cascade voltage multiplication is carried out to generate high-voltage pulse energy acting on the distributed electromagnetic transducer. The distributed electromagnetic transducer generates an outward-radiating pulsed sound field under the excitation of the pulse energy.

[0069] The high-repetition-rate high-power pulsed electromagnetic sound source system is equipped with an electromagnetic shielding shell, which can achieve the purpose of dust and water protection while resisting electromagnetic interference, and is convenient to carry.

[0070] Example scenario:

[0071] When driving an electromagnetic pulsed sound source, the driving device of the present invention can be adopted:

[0072] Step 1: Connect the output end of the present invention to the distributed electromagnetic transducer and place it in water (ocean), adjust the state of the electromagnetic transducer, connect the interconnection end to the display screen through the RS485 communication interface, connect the energy storage battery and the auxiliary power supply system, and power on the device.

[0073] Step 2: Judge whether the system is in the random emission state through the information on the display screen, and fill in parameters such as pulse width and pulse repetition frequency.

[0074] Step 3: Press the start button on the display screen to start the device. The pulse system generates pulsed energy of high voltage and large current to excite the distributed electromagnetic transducer, radiate an acoustic field outward, and generate an electromagnetic pulsed sound source.

[0075] Step 4: Press the stop button on the display screen to stop wave emission.

[0076] Step 5: Disconnect the power supply, disconnect the connection line between the device and the electromagnetic transducer, and disconnect the display screen interface. The example ends.

[0077] 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 the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A high-power pulse electromagnetic sound source system with a high repetition frequency, characterized in that: It comprises a distributed electromagnetic transducer, wherein three distributed E-type excitation stacks are evenly installed in the axial direction inside the distributed electromagnetic transducer; the distributed E-type excitation stack is electrically connected to a full-bridge load module, the full-bridge load module is electrically connected to a distributed cascade Marx module, the distributed cascade Marx module is electrically connected to a pulse synchronous drive circuit and a boost rectifier circuit; the boost rectifier circuit is electrically connected to a power supply and an inverter drive and protection circuit, and the pulse synchronous drive circuit and the inverter drive and protection circuit are both electrically connected to a control module; The power output from the power supply is boosted and rectified by the boost rectifier circuit and then cascaded and multiplied by the distributed cascade Marx modules to generate high-voltage pulses. The high-voltage pulses are bipolarly adjusted by the full-bridge load module and act on the three distributed E-type excitation stacks of the distributed electromagnetic transducer. The three distributed E-type excitation stacks excite the magnetic field respectively under the pulse excitation, generate electromagnetic force to drive the radiation plate to vibrate, and emit the sound field outward.

2. The high-power pulse electromagnetic sound source system with a high repetition frequency as claimed in claim 1, characterized in that: The control module includes a display screen, which is connected to a DSP+FPGA core control board in communication; the DSP+FPGA core control board includes a DSP and an FPGA; the DSP front end is connected to the display screen in communication to realize system start and stop, status display and intelligent adjustment of pulse parameters, and the DSP back end controls the inverter drive and protection circuit and samples the output voltage and current signals to realize closed-loop control; the FPGA front end realizes UART communication with the DSP to transmit data information, and the back end is electrically connected to a pulse synchronization drive circuit to control the operation of the Marx pulse circuit in the corresponding distributed cascade Marx module.

3. The high-power pulse electromagnetic sound source system with a high repetition frequency as claimed in claim 1, characterized in that: The distributed cascade Marx module comprises three Marx pulse circuits, each of the three Marx pulse circuits is electrically connected to a distributed E-type excitation stack, and the other end of each of the three Marx pulse circuits is electrically connected to a pulse synchronous drive circuit.

4. The high-power pulse electromagnetic sound source system with a high repetition frequency as claimed in claim 1, characterized in that: The distributed electromagnetic transducer comprises a cylindrical electromagnetic shielding shell, in which three E-type excitation stacks (5) arranged in a triangular distributed manner are installed, a coil (4) is wound on the E-type excitation stack (5), an armature (2) is located directly above the E-type excitation stack (5), an air gap (3) is formed between the armature (2) and the E-type excitation stack (5), and the top of the armature (2) is fixed to the lower surface of the radiation plate (1); when the full-bridge load module provides bipolar pulse excitation to the coil, the E-type excitation stack, the air gap and the armature respectively form a closed magnetic circuit, generate electromagnetic force, drive the vibration of the radiation plate surface, and the vibrating plate radiates sound field energy to the outside; its distributed excitation structure can reduce the overall inductance of the electromagnetic transducer, prevent the saturation of the E-type excitation stack, and reduce current tailing while obtaining a greater electromagnetic force; The radiation plate is a metal sheet made of aluminum alloy and is fixed by a rubber seal; The armature is made of stacked silicon steel sheets; The E-type excitation stack is formed by stacking a plurality of E-type silicon steel sheets, and the coil is wound around the silicon steel sheets in a clockwise direction.

5. The high-power pulse electromagnetic sound source system with a high repetition frequency as claimed in claim 2, characterized in that: The display screen is a capacitive touch HMI serial port screen, model TJC4827X343_011X, which is connected to the DSP via RS485 communication mode and is used to monitor and control the electromagnetic pulse sound source drive device. The display screen interface includes output status display, device start and stop buttons, pulse width and repetition frequency adjustment, and early warning prompts; The DSP chip model is TMS320f28379D, which has 800MIPS, 2 CPUs, 2 CLAs, and is connected to the display screen to realize the intelligent control of the pulse sound source system, including the first communication unit, the data processing unit and the sampling unit; The first communication unit includes RS485 and RS232 interfaces, which communicate with the display screen and FPGA respectively; The sampling unit includes a DSP internal ADC sampling module, which is used to obtain the output feedback signal of the boost rectifier circuit and the distributed cascade Marx module as a sampling signal, and transmit the information to the data processing unit; The data processing unit is used to calculate and process the display screen control signal and the sampling signal.

6. The high-power pulse electromagnetic sound source system with high repetition frequency as claimed in claim 2, characterized in that: The FPGA model is EP4CE10F17C8, which has 10k logic units and 414kbit embedded RAM resources. It receives control signals generated by DSP and implements driving and protection functions according to instructions. It contains a second UART communication unit, a pulse signal generation unit and an overcurrent protection unit. The second UART communication unit includes an RS232 interface, which realizes communication between the FPGA and the DSP through a serial port line; The pulse signal generating unit generates a delayed signal based on the DDS technology and cooperates with the DSP to adjust the signal parameters; The overcurrent protection unit performs overcurrent protection on the Marx pulse generator by judging and processing the DSP sampling data to ensure stable operation of the system; The driving and protection circuit comprises an inverter driving and protection circuit and a pulse synchronous driving circuit; The inverter drive and protection circuit includes an IR2110S driver chip, which amplifies the control signal generated by the DSP and acts on the full-bridge inverter circuit of the boost rectifier circuit to drive it to work normally; The pulse synchronous driving circuit includes a power amplifier circuit based on the IXDN609 chip, and the power amplifier circuit based on the IXDN609 chip is electrically connected to an optical coupler isolation circuit based on the FR50MHIR chip; the optical coupler isolation circuit based on the FR50MHIR chip is used for conversion between TTL signals and optical fiber signals, so that the control circuit and the Marx pulse circuit have better electrical isolation, suppress electromagnetic interference, and ensure the stability of the trigger signal; The power amplifier circuit based on the IXDN609 chip is used to receive the driving signal generated by the FPGA, amplify the signal and apply it to the Marx pulse generator to realize the distributed driving function.

7. The high-power pulse electromagnetic sound source system with a high repetition frequency as claimed in claim 2, characterized in that: The Marx pulse circuit comprises a plurality of single-stage networks; each single-stage network comprises a fast recovery diode (D1); the cathode of the fast recovery diode (D1) is electrically connected to one end of an energy storage capacitor (C1) and the drain of a first MOS tube (S1); the source of the first MOS tube (S1) is electrically connected to the drain of a second MOS tube (S2); the source of the second MOS tube (S2) is electrically connected to the other end of the energy storage capacitor; wherein the cathode of the fast recovery diode (D1) of the previous single-stage network is electrically connected to the anode of the fast recovery diode (D1) of the next single-stage network; the source of the first MOS tube (S1) of the previous single-stage network is electrically connected to the source of the second MOS tube (S2) of the next single-stage network; the plurality of single-stage networks are charged in parallel and discharged in series with a doubled voltage, so as to provide pulse energy for a single E-type excitation stack in a distributed electromagnetic transducer and radiate a pulse sound source.

8. The high-power pulse electromagnetic sound source system with a high repetition frequency as claimed in claim 4, characterized in that: There are three full-bridge load modules, each of which is electrically connected to a coil (4) on an E-type excitation stack (5); the full-bridge load modules include an eleventh IGBT tube (S11), a twelfth IGBT tube (S12), a thirteenth IGBT tube (S13) and a fourteenth IGBT tube (S14), wherein the collector of the eleventh IGBT tube (S11) is electrically connected to the collector of the fourteenth IGBT tube (S14); the emitter of the eleventh IGBT tube (S11) is electrically connected to the collector of the twelfth IGBT tube (S12) and one end of the coil (4), the emitter of the twelfth IGBT tube (S12) is electrically connected to the emitter of the thirteenth IGBT tube (S13), and the collector of the thirteenth IGBT tube (S13) is electrically connected to the other end of the coil (4) and the emitter of the fourteenth IGBT tube (S14); The full-bridge load module changes the Marx pulse output characteristics. The Marx pulse circuit outputs two continuous pulses. When the first pulse is output, the eleventh IGBT tube (S11) and the thirteenth IGBT tube (S13) are turned on, the twelfth IGBT tube (S12) and the fourteenth IGBT tube (S14) are turned off, and the full-bridge load module outputs a positive polarity pulse. When the second pulse is output, the eleventh IGBT tube (S11) and the thirteenth IGBT tube (S13) are turned off, the twelfth IGBT tube (S12) and the fourteenth IGBT tube (S14) are turned on, and the full-bridge load circuit outputs a negative polarity pulse. The current waveform flowing through the distributed electromagnetic transducer is controlled by bipolar pulses, the current tail of the inductive load is reduced, and the sound source characteristics of the distributed electromagnetic transducer are controlled.

9. The high-power pulse electromagnetic sound source system with a high repetition frequency as claimed in claim 4, characterized in that: It also includes an auxiliary power supply system for controlling the power supply of the system.

10. A method for using the high-power pulse electromagnetic sound source system with a high repetition frequency according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: Put the distributed electromagnetic transducer into water, adjust the state of the distributed electromagnetic transducer, connect the interconnection end to the display screen of the control module through the RS485 communication interface, and power it on through the energy storage battery and the auxiliary power supply system; Step 2: Use the information on the display screen to determine whether the high-power pulse electromagnetic sound source system with a high repetition frequency is in a random state, and fill in the pulse width and pulse repetition frequency; Step 3: Press the start button on the display screen to start the device. The distributed cascade Marx module generates high-voltage and high-current pulse energy to excite the distributed electromagnetic transducer, radiate the sound field outward, and generate an electromagnetic pulse sound source. Step 4: Press the stop button on the display screen to stop emitting waves; Step 5: Disconnect the power supply, disconnect the connection line between the device and the electromagnetic transducer, and disconnect the display interface.

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