Aviation transient electromagnetic constant-amplitude in-phase parallel transmitter system and control method thereof

Abstract

The invention provides an aviation transient electromagnetic constant-amplitude in-phase parallel transmitter system, and the system comprises a power management unit which is used for supplying power; the full-bridge inverter circuit unit comprises a plurality of MOSFET full-bridge inverter modules which are arranged in parallel, each MOSFET full-bridge inverter module sends out a constant-amplitude in-phase bipolar parallel current pulse to a transmitting load connected with the MOSFET full-bridge inverter module, so that each transmitting load generates a constant-amplitude in-phase electromagnetic field, and the constant-amplitude in-phase electromagnetic fields are superposed and jointly act on a to-be-detected target; the active self-adaptive voltage-adjustable double-clamping unit is connected with the full-bridge inverter circuit unit and is used for clamping the rising edge and the falling edge of each sub-pulse in the equal-amplitude in-phase bipolar parallel current pulse; the control unit is used for generating a PWM (Pulse Width Modulation) sequential logic control signal to control the full-bridge inverter circuit unit, so that each MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) full-bridge inverter module outputs a constant-amplitude in-phase bipolar parallel current pulse; and the detection unit is used for detecting the emission current, the clamping current and the clamping voltage respectively and feeding back detection results to the control unit.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electromagnetic detection, and in particular to an aviation transient electromagnetic equal-amplitude and same-phase parallel high-power transmitter system and a control method thereof. Background Art

[0002] Transient electromagnetic method is an important geophysical exploration technology. Especially when compared with frequency domain electromagnetic method, time domain electromagnetic method can achieve long-distance detection with simpler equipment due to its principle advantages. Airborne transient electromagnetic method (AEM) is widely used in engineering exploration, mineral exploration and geological mapping due to its high efficiency, low cost and good adaptability. The airborne transient electromagnetic detection system uses aircraft as a carrier and is mainly composed of an electromagnetic transmitter, a transmitting coil and a receiving system. The pulse current in the transmitting coil forms an alternating primary field; when the current is turned off, the primary field disappears quickly, and the underground conductor generates induced eddy currents, which excite an alternating secondary field that changes with time. The receiving system is responsible for capturing this information. Due to the different sizes and attenuation rates of the induced eddy currents caused by different physical properties of the underground, the secondary field can reflect the physical characteristics of the target. Analyzing the attenuation law of the secondary field helps to identify the distribution and related physical parameters of underground geological bodies with different electrical properties. The current electromagnetic pulse transmitter is the core of the airborne electromagnetic system and directly affects the detection performance. The transmitter needs to reach a current amplitude of hundreds to thousands of amperes and have high-frequency pulse repetition characteristics. To meet these requirements, the falling and rising edges of the current pulse must be fast and linear to reach a peak value of kiloamperes in a short time. However, the existing high-current electromagnetic pulse transmission system is generally a single transmitter with a multi-turn coil as the transmission load, and the transmission load can be equivalent to a circuit with a resistor and an inductor in series. Since the inductor has the characteristic of hindering the change of current, the rising and falling edges of the transmitter output current change exponentially, and it is impossible to quickly reach the peak current and shut down. In addition, the large voltage generated at the moment of opening and closing will test the voltage resistance performance of the components. Summary of the invention

[0003] In view of this, in order to at least partially solve at least one of the above-mentioned technical problems, the present disclosure provides an aviation transient electromagnetic equal-amplitude and in-phase parallel transmitter system and a control method thereof.

[0004] In order to achieve the above purpose, the technical solution of the present invention is as follows:

[0005] According to an embodiment of the present disclosure, an aviation transient electromagnetic equal-amplitude in-phase parallel transmitter system is provided, including a power management unit, a full-bridge inverter circuit unit, an active adaptive adjustable voltage dual clamp unit, a control unit, and a detection unit.

[0006] The power management unit is used for power supply; the full-bridge inverter circuit unit includes a plurality of MOSFET full-bridge inverter modules arranged in parallel, each MOSFET full-bridge inverter module sends an equal-amplitude in-phase bipolar parallel current pulse to its connected transmitting load, so that each transmitting load generates an equal-amplitude in-phase electromagnetic field, and each equal-amplitude in-phase electromagnetic field is superimposed and acts on the target to be measured; the active adaptive adjustable voltage dual clamping unit is connected to the full-bridge inverter circuit unit, and is used to clamp the rising edge and falling edge of each sub-pulse in the equal-amplitude in-phase bipolar parallel current pulse; the control unit is used to generate a PWM timing logic control signal to control the full-bridge inverter circuit unit, so that each MOSFET full-bridge inverter module outputs an equal-amplitude in-phase bipolar parallel current pulse; the detection unit is respectively connected to the control unit, the full-bridge inverter circuit unit, and the active adaptive adjustable voltage dual clamping unit, and is used to respectively realize the detection of the transmitting current, the clamping current, and the clamping voltage, and feed back the detection result to the control unit.

[0007] According to an embodiment of the present disclosure, the power management unit includes: a DC / DC main control circuit power supply module, which supplies power to the control unit; a DC / DC power supply module, which is used to provide an adjustable voltage for the full-bridge inverter circuit unit; and a DC / DC isolated drive circuit power supply module, which is used to provide the required voltage to the MOSFET driver.

[0008] According to an embodiment of the present disclosure, each of the MOSFET full-bridge inverter modules includes a first MOSFET power switch group and a second MOSFET power switch group. By controlling the first MOSFET power switch group and the second MOSFET power switch group to be alternately turned on, the current direction on the transmitting load is made to flow in a forward direction or a reverse direction, thereby realizing the generation of equal-amplitude and same-phase bipolar parallel current pulses.

[0009] According to an embodiment of the present disclosure, an active adaptive adjustable voltage double clamp module includes: an adjustable voltage high voltage power supply DC H ; High voltage capacitor bank, including multiple capacitors connected in parallel to an adjustable high voltage power supply DC H High-voltage capacitors at both ends; power diode D13, connected in series with an adjustable high-voltage power supply DC H The output circuit is used to prevent the energy of the high-voltage capacitor group from flowing back into the power supply and causing damage when the voltage of the high-voltage capacitor group is higher than the power supply voltage; the high-voltage capacitor discharge resistor R3 is connected in parallel on both sides of the high-voltage capacitor group to discharge the energy stored in the high-voltage capacitor group in time when the pulse current emission ends to avoid danger; and multiple clamping MOSFET power switches are respectively connected in series with each MOSFET full-bridge inverter module and then connected in parallel next to the high-voltage capacitor group.

[0010] According to an embodiment of the present disclosure, the adjustable high voltage power supply DC HThe control unit is connected to the control unit, and the control unit controls the adjustable high voltage power supply DC according to the transmission load parameters and the combined pulse parameters. H The output voltage of the adjustable high voltage DC power supply H The high-voltage capacitor is charged to a set constant voltage; the control unit controls multiple clamping MOSFET power switches to be turned on accurately for a set time at the rising edge of the equal-amplitude and in-phase bipolar parallel current pulse according to the combined pulse parameters to be emitted, so that the high-voltage capacitor group releases energy to the emission load through the MOSFET full-bridge inverter module at the rising edge of the current pulse, so that the current pulse is quickly established. The combined pulse parameters include the frequency, amplitude and width of the combined pulse.

[0011] According to the embodiments of the present disclosure, the high-voltage capacitor group absorbs the voltage spike generated by the emission load at the moment of shutdown, so that the current pulse drops rapidly and linearly.

[0012] According to the embodiments of the present disclosure, multiple clamping MOSFET power switches cooperate with a high-voltage capacitor group to achieve double clamping of pulse adjustable voltage and adjustable intervention time, thereby improving the quality of the transmitted waveform.

[0013] According to an embodiment of the present disclosure, the control unit includes: an adaptive adjustable voltage control module, which outputs a clamping voltage and a clamping time after calculation based on the real-time detection results collected by the detection unit, thereby clamping the rising and falling edges of the current pulse.

[0014] An embodiment of another aspect of the present disclosure provides a control method for the above-mentioned aviation transient electromagnetic equal-amplitude in-phase parallel transmitter system, including: charging a high-voltage capacitor group and providing the same voltage to multiple MOSFET full-bridge inverter modules; under the action of the power supply voltage, the multiple MOSFET full-bridge inverter modules emit equal-amplitude in-phase bipolar parallel current pulses to the connected transmitting loads, so that the superimposed electromagnetic field generated by the multiple parallel transmitting loads acts on the target to be measured; actively adaptively and adjustable double clamping is performed on the rising edge and falling edge of each sub-pulse in the equal-amplitude in-phase bipolar parallel current pulse; the equal-amplitude in-phase bipolar parallel current pulse, the power supply voltage, the clamping current, and the clamping voltage are detected; and different PWM timing logic control signals are emitted based on the detection results to achieve adjustment of the equal-amplitude in-phase bipolar current pulse.

[0015] The present invention discloses an aviation transient electromagnetic equal-amplitude and same-phase parallel transmitter system and its control method, which uses multiple equal-amplitude and same-phase low-power transmitters to connect multiple single-turn loads, and connects them in parallel in an active adaptive adjustable voltage dual constant voltage clamping circuit, which can alleviate the high instantaneous power demand when a single transmitter transmits a large current pulse, the large transmitting inductance of a single transmitting coil, the large instantaneous voltage when opening and closing, the pressure resistance test of components, and the current rising and falling edges are not fast enough and linear. The active adaptive adjustable voltage dual clamping technology used in the transmitter system can not only effectively clamp the high voltage of the falling edge of the current pulse at the moment when the transmitting power switch is turned off, but also allow the clamped power switch to reverse conduct at the moment when the transmitting power switch is closed, so that the high-voltage capacitor group can reversely charge the load, and realize the discharge of capacitor energy and the role of helping the current rising edge to increase quickly by controlling the opening time. The volume and weight of multiple low-power transmitters with multiple single-turn loads are smaller than that of a single high-power transmitter with a single multi-turn coil. In addition, the number of transmitters and loads in the parallel transmission system can be appropriately increased or decreased according to actual transmission requirements, which is more convenient for use in actual scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0017] Figure 1 It is a schematic diagram of an aviation transient electromagnetic equal-amplitude and in-phase parallel transmitter system according to an embodiment of the present disclosure.

[0018] Figure 2 It is a schematic diagram of an aviation transient electromagnetic equal-amplitude and in-phase parallel transmitter system according to another embodiment of the present disclosure.

[0019] Figure 3 The present invention is a flow chart of a control method for an aviation transient electromagnetic equal-amplitude and in-phase parallel transmitter system according to an embodiment of the present invention.

[0020] Figure 4 The diagram is a schematic diagram of the on-off control and key waveforms of the aviation transient electromagnetic equal-amplitude and in-phase parallel transmitter system according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0021] The present invention provides an aviation transient electromagnetic equal-amplitude and same-phase parallel transmitter system and its control method, which uses multiple equal-amplitude and same-phase low-power transmitters to connect a single-turn load respectively, and are connected in parallel in an active adaptive adjustable voltage dual constant voltage clamping circuit to form a parallel high-power transmission system to alleviate the high instantaneous power demand of a single transmitter, the large transmitting inductance of the original single multi-turn transmitting coil, the large instantaneous voltage when turned on and off, which tests the voltage resistance of components, and the technical problems such as the current rising edge and falling edge are not fast enough and linear enough. At the same time, the active adaptive adjustable voltage dual clamping technology used in the system can not only effectively clamp the falling edge of the current pulse at the moment when the power switch of the transmitting circuit is turned off, but also reverse conduct at the moment when the power switch of the transmitting circuit is closed, so that the high-voltage clamped capacitor can reversely charge the load, and the discharge of the capacitor energy and the role of helping the current rising edge to increase quickly can be achieved by controlling the opening time.

[0022] The disclosed aviation transient electromagnetic equal amplitude and same phase parallel transmitter system and its control method, aiming at the demand of aviation time domain electromagnetic detection pulse, proposes to connect a single turn load with multiple equal amplitude and same phase low power transmitters, and connect them in parallel in a feed type active constant voltage clamp circuit to form a parallel type high power transmission system, so as to alleviate the technical problems such as high instantaneous power demand of a single transmitter, large transmitting inductance of a single transmitting coil, large instantaneous voltage of opening and closing, test of voltage resistance of components, fast and linear rising and falling edges of current in traditional transmitting system. High-quality pulse transmission with fast establishment and fast linear decline is realized. In addition, unlike the traditional active constant voltage clamp technology, the active adaptive adjustable voltage dual clamp technology used in this system can not only effectively clamp the falling edge of the current pulse at the moment when the power switch of the transmitting circuit is turned off, but also reverse conduct at the moment when the power switch of the transmitting circuit is closed, so that the feeding capacitor of the constant voltage clamp circuit can reversely charge the load, and the discharge of capacitor energy and the role of helping the rising edge of the current to rise quickly are realized by controlling the opening time. In the process of realizing the present disclosure, it is necessary to: (1) design an active adaptive adjustable dual clamp module to actively clamp the rising and falling edges of the current in the equal-amplitude and same-phase parallel full-bridge inverter circuit; (2) require an active adaptive adjustable dual clamp module to accurately control the clamp voltage and clamp intervention time at the rising edge of each pulse for different amplitude pulses in the equal-amplitude and same-phase parallel full-bridge inverter circuit; (3) require accurate control of driving fast-off MOSFET to achieve stable output of the power inverter bridge; (4) accurately control the drive to achieve multi-channel emission current to achieve equal-amplitude and same-phase output of the parallel full-bridge inverter circuit; (5) accurately detect and feedback the real-time waveform of the emission current; (6) accurately detect and feedback the clamp current and clamp voltage; (7) adaptively control and adjust the size and intervention time of the clamp voltage according to the feedback emission current emission and clamp current waveforms. In response to the above problems, the purpose of the present invention is to design a system that can use an equal-amplitude, in-phase parallel full-bridge inverter circuit to transmit current pulses, perform active adaptive and adjustable double clamping on both the rising and falling edges of the current pulses, and have lower requirements on components, less loss, and higher efficiency than traditional transmitting systems.

[0023] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0024] In the embodiment of the present disclosure, an aviation transient electromagnetic equal amplitude and phase parallel transmitter system is provided, combined with Figure 1 and Figure 2 As shown, the transmitter system comprises:

[0025] A power management unit for supplying power;

[0026] The full-bridge inverter circuit unit includes one or more MOSFET full-bridge inverter modules arranged in parallel, each MOSFET full-bridge inverter module sends an equal-amplitude and same-phase bipolar parallel current pulse to the respective connected transmitting loads, so that each transmitting load generates an electromagnetic field of equal amplitude and same phase, and the electromagnetic fields of equal amplitude and same phase are superimposed and act on the target to be measured;

[0027] An active adaptive voltage-adjustable dual clamping unit, connected to the full-bridge inverter circuit unit, for clamping the rising edge and falling edge of each sub-pulse in the equal-amplitude and in-phase bipolar parallel current pulse;

[0028] A control unit, used for generating a PWM timing logic control signal to control the full-bridge inverter circuit unit, so that each MOSFET full-bridge inverter module outputs equal-amplitude and same-phase bipolar parallel current pulses; and

[0029] The detection unit is connected to the control unit, the full-bridge inverter circuit unit, and the active adaptive voltage-adjustable dual clamping unit respectively, and is used to detect the emission current, clamping current, and clamping voltage respectively, and feed back the detection results to the control unit.

[0030] According to an embodiment of the present disclosure, the power management unit includes:

[0031] DC / DC main control circuit power module, which supplies power to the control unit;

[0032] A DC / DC power supply module for providing an adjustable voltage for a full-bridge inverter circuit unit; and

[0033] The DC / DC isolated drive circuit power module is used to provide the required voltage to the MOSFET driver driving the active adaptive adjustable voltage double clamp unit.

[0034] According to the embodiment of the present disclosure, Figure 1 As shown, the full-bridge inverter circuit unit includes a MOSFET full-bridge inverter module connected to a transmitter load, such as Figure 2 The full-bridge inverter circuit unit shown includes two MOSFET full-bridge inverter modules arranged in parallel, each of which includes a first MOSFET power switch group and a second MOSFET power switch group. By controlling the first MOSFET power switch group and the second MOSFET power switch group to be turned on alternately, the current direction on the transmitting load is made to flow in a forward direction or a reverse direction, thereby realizing the generation of equal-amplitude in-phase bipolar parallel current pulses. Specifically, as Figure 1As shown, in the MOSFET full-bridge inverter module, the MOSFET power switch Q1 and the MOSFET power switch Q3 constitute a first MOSFET power switch group, and the MOSFET power switch Q2 and the MOSFET power switch Q4 constitute a second MOSFET power switch group.

[0035] like Figure 2 As shown, in the MOSFET full-bridge inverter module (which may be referred to as the first MOSFET full-bridge inverter module) located at the bottom of the figure, MOSFET power switch Q1 and MOSFET power switch Q4 constitute a first MOSFET power switch group, and MOSFET power switch Q2 and MOSFET power switch Q3 constitute a second MOSFET power switch group. The control unit may alternately control the first MOSFET power switch group or the second MOSFET power switch group to conduct, so that the current on the emission load (equivalent to RL1, L1, R1 in the figure) flows forward and reversely, thereby realizing the generation of bipolar parallel current pulses.

[0036] like Figure 2 As shown, in the MOSFET full-bridge inverter module (which may be referred to as the second MOSFET full-bridge inverter module) located above the diagram, MOSFET power switch Q5 and MOSFET power switch Q8 constitute a first MOSFET power switch group, and MOSFET power switch Q6 and MOSFET power switch Q7 constitute a second MOSFET power switch group. The control unit may alternately control the first MOSFET power switch group or the second MOSFET power switch group to conduct, allowing the current on another transmitting load (equivalent to RL2, L2, R2 in the diagram) to flow in the forward direction and the reverse direction, thereby realizing the generation of bipolar parallel current pulses.

[0037] Each MOSFET power switch contains a body diode. D1-D8 represent the body diodes inside the eight MOSFETs, which are not discrete components. When the first MOSFET power switch group or the second MOSFET power switch group is turned on, the body diodes D1-D8 are in a reverse cutoff state; when the first MOSFET power switch group or the second MOSFET power switch group is turned off, since the emission load is an inductive load, the current cannot change suddenly, and the body diodes D1-D8 are briefly in a conducting state to quickly release the energy on the emission load.

[0038] According to the embodiment of the present disclosure, Figure 1 and Figure 2 As shown, the active adaptive adjustable voltage dual clamp unit includes an adaptive clamp circuit and an adaptive clamp high voltage source: specifically, it includes:

[0039] Adjustable high voltage DC power supply H ;

[0040] A high voltage capacitor bank, comprising a plurality of capacitors connected in parallel to an adjustable high voltage power supply DC H High voltage capacitors at both ends (C1-Cn);

[0041] Power diode D13, connected in series with adjustable high voltage power supply DC H The output circuit is used to prevent the energy of the high-voltage capacitor bank from flowing back to the power supply and causing damage when the voltage is higher than the power supply voltage.

[0042] The high-voltage capacitor discharge resistor R3 is connected in parallel to both sides of the high-voltage capacitor group, and is used to discharge the energy stored in the high-voltage capacitor group in time when the pulse current emission ends to avoid danger; and

[0043] A plurality of clamped MOSFET power switches are respectively connected in series with each MOSFET full-bridge inverter module and then connected in parallel beside the high-voltage capacitor group.

[0044] According to the disclosed embodiment, the high-voltage capacitor group absorbs the voltage spike generated by the transmitting load at the moment of shutdown, so that the current pulse drops rapidly and linearly. Multiple clamping MOSFET power switches cooperate with the high-voltage capacitor group to achieve double clamping of pulse adjustable voltage and adjustable intervention time, thereby improving the quality of the transmitting waveform.

[0045] like Figure 1 As shown, a MOSFET power switch Q5 may also be included. Figure 2 As shown, it includes two MOSFET power switches Q9 and Q10, which are connected after the first MOSFET full-bridge inverter module and the second MOSFET full-bridge inverter module respectively. H One end is connected to the control module, and the control module controls the adjustable high voltage power supply DC according to the transmission load parameters and the combined pulse parameters. H Output voltage, adjustable high voltage DC power supply HCharge the high-voltage capacitor to a constant voltage. The control module controls Q9 and Q10 to precisely conduct for a period of time at the rising edge of the bipolar combined current pulse according to the parameters of the combined pulse to be transmitted (including the frequency, amplitude and width of the combined pulse), so that the high-voltage capacitor group C1-Cn releases energy to the transmitting load through the MOSFET equal-amplitude in-phase parallel full-bridge inverter module at the rising edge of the current pulse, so that the current pulse is quickly established; the high-voltage capacitor group C1-Cn absorbs the voltage spike generated by the transmitting load at the moment of shutdown, so that the current pulse drops rapidly and linearly. Q9, Q10 cooperate with C1-Cn to achieve dual clamping of pulse adjustable voltage and adjustable intervention time, greatly improving the quality of the transmitted waveform. The function of D13 is to prevent the energy from flowing back to the power supply when the voltage of the capacitor group C1-Cn is higher than the voltage of the power supply UC, causing damage. The function of the high-voltage capacitor discharge resistor R3 is to discharge the energy stored in the high-voltage capacitor group C1-Cn in time at the end of the transmission to avoid danger.

[0046] According to the embodiment of the present disclosure, Figure 1 , Figure 2 As shown, the detection unit includes: an emission current detection module, a clamping current detection module, and a clamping voltage detection module.

[0047] The current detection module is connected to the transmitting load and is used to detect the bipolar combined current pulse in the transmitting load; the clamping voltage detection module is connected to the active adaptive adjustable voltage dual clamping module and is used to detect the voltage of the above-mentioned high-voltage capacitor group; the clamping current detection module is connected to the active adaptive adjustable dual clamping module and is used to detect the current pulses flowing into and out of the high-voltage capacitor group. The current detection module includes a Hall current sensor, an operational amplifier, and a differential amplifier. The current value collected by the sensor is calculated and converted, and the signal is transmitted to the control module. The clamping voltage detection module includes: a voltage acquisition chip, a voltage follower, and an isolator. The clamping voltage is divided by a power resistor and then collected and converted by a voltage acquisition chip, and the signal is transmitted to the control module through a voltage follower and an isolator.

[0048] According to an embodiment of the present disclosure, the control unit includes: an adaptive adjustable voltage clamp control module, a power supply voltage control module, and a MOSFET drive signal control module.

[0049] The adaptive adjustable voltage control module calculates and outputs the clamping voltage and clamping time according to the real-time detection results collected by the detection unit, thereby clamping the rising and falling edges of the current pulse.

[0050] The adaptive adjustable voltage control module is connected to the detection unit, and outputs different control quantities according to the detection results, including adaptive clamping voltage control and adaptive clamping time control. Its core is the adaptive controller, which is based on the model adaptive control method. According to the real-time data collected by the current detection module, the clamping voltage detection module, and the clamping current detection module, it calculates and outputs the clamping voltage and clamping time to achieve active adaptive adjustable dual clamping of the emission current.

[0051] The adaptive adjustable voltage control module is connected to the detection unit and outputs different control quantities according to the detection results, including adaptive clamping voltage control and adaptive clamping time control. The adaptive adjustable clamping voltage control module acts on the adjustable voltage high voltage power supply DC based on the output of the adaptive control module. H , to adjust the clamping voltage; the adaptive clamping time control module acts on MOSFET Q9 and Q10 based on the control quantity output by the adaptive control module to adjust the clamping intervention time;

[0052] The power supply voltage control module acts on the DC / DC power supply modules of each parallel full-bridge inverter circuit based on the control quantity output by the main control module to ensure that the same power supply voltage is provided to each full-bridge inverter circuit;

[0053] The MOSFET drive signal control module generates PWM timing logic control signals with different duty cycles using FPGA.

[0054] The control unit may also include:

[0055] FPGA controller, used to generate PWM timing logic control signals, full-bridge inverter circuit power supply voltage regulation, adaptive clamping voltage regulation and clamping time control signals, used to control and receive GPS module signals and communicate with the MCU controller;

[0056] MCU controller, used to control the human-machine interactive display touch screen and indicator light and write data to the SD card, issue transmission parameters and instructions to the FPGA controller, and is also responsible for receiving temperature sensor data;

[0057] GPS module, used to determine the transmitter's location in real time;

[0058] SD card storage module, used to store current waveform data and GPS information;

[0059] Temperature detection module, real-time monitoring of the internal temperature of the transmitter to prevent the system from overheating;

[0060] A MOSFET driving module is connected to the control module, converts the control signal into a MOSFET power switch control signal with stronger driving capability, and realizes electrical isolation between the control module and the power switch in the MOSFET full-bridge inverter circuit;

[0061] The human-computer interactive display touch screen is used to display the launch parameters in real time, as well as to manually set the launch parameters and control the launch.

[0062] Another aspect of the present disclosure further provides a control method for the above-mentioned aviation transient electromagnetic equal-amplitude and in-phase parallel transmitter system, such as Figure 3 As shown, the control method includes:

[0063] Operation S1: charging the high-voltage capacitor bank and providing the same voltage to multiple MOSFET full-bridge inverter modules;

[0064] Operation S2: under the action of the supply voltage, multiple MOSFET full-bridge inverter modules send equal-amplitude and same-phase bipolar parallel current pulses to the connected transmitting loads, so that the superimposed electromagnetic field generated by the multiple parallel transmitting loads acts on the target to be measured;

[0065] Operation S3: performing active adaptive adjustable double clamping on the rising edge and the falling edge of each sub-pulse in the equal-amplitude and in-phase bipolar parallel current pulse;

[0066] Operation S4: detecting equal-amplitude and in-phase bipolar parallel current pulses, a supply voltage, a clamping current, and a clamping voltage; and

[0067] Operation S5: issuing different PWM timing logic control signals based on the detection result to adjust the equal-amplitude and in-phase bipolar current pulses.

[0068] Specifically, the high-voltage capacitor group is first charged with an adjustable high-voltage power supply, and the same voltage is provided to each power supply module of the parallel full-bridge inverter circuit; under the action of the power supply module supply voltage, current pulses of equal amplitude and phase are sent to the connected transmitting load, so that the combined electromagnetic field generated by the parallel transmitting load acts on the target to be measured; the rising edge and falling edge of each sub-pulse in the bipolar parallel current pulse are actively adaptively adjustable double clamped; the bipolar parallel current pulse, the power supply voltage, and the clamping current and clamping voltage used for clamping are detected; based on the detection results and the control of personnel, different timing logic control signals are sent to achieve the adjustment of the bipolar current pulse.

[0069] In the embodiment of the present disclosure, Figure 4 and Figure 1 , Figure 2As shown, S1 is the control signal of the first MOSFET power switch group, S2 is the control signal of the second MOSFET power switch group, and S3 is the control signal of the clamping MOSFET power switch group Q9 and Q10. 负载 (t) is the current pulse, I （max） is the maximum current of the full-bridge inverter circuit, U 负载 (t) is the voltage at the transmitting load, U （电源） The voltage provided by the DC / DC power supply module, U （钳位） is the clamping voltage, I 钳位 (t) is the clamping current next to the high-voltage capacitor group.

[0070] Before time t1 is the launch preparation stage, it is necessary to adjust the power supply voltage of the parallel full-bridge inverter circuit to the specified launch voltage in advance, adjust the adjustable high-voltage power supply of the active adaptive adjustable voltage dual clamp module to the set clamping voltage, and charge the high-voltage capacitor group C1-Cn.

[0071] At time t1, the forward large current pulse in the equal-amplitude in-phase bipolar parallel current pulse begins to be emitted. The S1 signal controls the first MOSFET power switch group to turn on, so that the current flows forward to the emission load, and the equal-amplitude in-phase current in the parallel full-bridge inverter circuit begins to rise. At the same time, the S3 signal controls the clamping MOSFET power switch group to turn on, so that the active adaptive adjustable dual clamp module performs high-voltage clamping on the rising edge. The high-voltage capacitor group and the adjustable high-voltage power supply simultaneously supply power to the emission load, and the equal-amplitude in-phase current rises rapidly and linearly. At this time, the current flowing through the clamping circuit is the sum of the currents of the two full-bridge inverter circuits -2I 发射 .

[0072] At t2, the S3 signal controls the clamping MOSFET power switch group to turn off, ending the rising edge clamping, and the equal-amplitude in-phase current begins to rise exponentially to the peak value of the positive large current pulse I （max） .

[0073] At t3, the S1 signal controls the first MOSFET power switch group to turn off, and the emission of the forward large current pulse begins to stop. At the same time, the second MOSFET power switch group and the clamping MOSFET power switch group are turned on by the body diode, and the active adaptive adjustable voltage double clamp module performs constant voltage clamping on the falling edge, and the equal amplitude and same phase current on the emission load is transmitted through the Figure 2 The body diodes D2, D3, D6, D7, D9, and D10 in the clamping circuit flow to the high-voltage capacitor group C1-Cn, which absorbs the excess energy on the transmitting load. The equal-amplitude and in-phase currents decrease rapidly and linearly. Because of the parallel connection, the current flowing through the clamping circuit is the sum of the currents of the two full-bridge inverter circuits, 2I （max） .

[0074] At t4, the current drops to 0, and the clamping current also drops to 0. The body diodes D2, D3, D6, D7, D9, and D10 are turned off, and the forward large current pulses of equal amplitude and same phase are transmitted.

[0075] During the time period t5 to t8, the emission reverse large current pulse in the equal-amplitude and in-phase bipolar parallel current pulse has a clamped MOSFET power switch group control process that is similar to that during the time period t1 to t4, except that the on-off control of the first MOSFET power switch group in the MOSFET parallel full-bridge inverter circuit is replaced by the on-off control of the second MOSFET power switch group, which will not be elaborated herein.

[0076] When the next cycle of equal-amplitude and in-phase positive and negative pulses arrives, the state of t1-t8 is repeated.

[0077] It should be noted that the MOSFET power switches in the full-bridge inverter circuit unit and the active adaptive adjustable voltage dual clamp unit can be replaced by IGBT power switches; the values ​​of components such as resistors and capacitors can also be changed within a small range to obtain current pulses and voltage values ​​that meet the needs of the scene at the time.

[0078] In summary, the present disclosure provides an aviation transient electromagnetic equal-amplitude, in-phase, parallel high-power transmitting system and control method to improve the problems in the prior art of aviation small electromagnetic transmitting systems, where a single transmitter is equipped with a multi-turn transmitting coil, resulting in large resistance and inductance, poor detection effect and low efficiency; to achieve rapid establishment of the rising edge of the transmitting current and rapid linear decline of the falling edge, to improve the problem that the traditional constant voltage clamping circuit cannot clamp the rising edge and falling edge of current pulses of different widths and amplitudes at the same time or the clamping effect is poor.

[0079] So far, the embodiments of the present disclosure have been described in detail in conjunction with the accompanying drawings. It should be noted that the implementation methods not shown or described in the drawings or the body of the specification are all forms known to ordinary technicians in the relevant technical field and are not described in detail. In addition, the above definitions of each element and method are not limited to the various specific structures, shapes or methods mentioned in the embodiments, and ordinary technicians in the field can simply change or replace them.

[0080] It should be noted that, in this document, unless otherwise specified, “a” element is not limited to a single element, but may include one or more elements.

[0081] In addition, in this document, unless otherwise specified, ordinal numbers such as "first" and "second" are only used to distinguish multiple components with the same name, and do not indicate that there is a hierarchy, level, execution order, or process order between them. A "first" component and a "second" component may appear together in the same component, or appear in different components. The presence of a component with a larger ordinal number does not necessarily indicate the presence of another component with a smaller ordinal number.

[0082] In this document, unless otherwise specified, the so-called feature A "or" or "and / or" (and / or) feature B means that A exists alone, B exists alone, or A and B exist at the same time; the so-called feature A "and" (and) or "and" (and) or "and" (and) feature B means that A and B exist at the same time; the so-called "include", "comprise", "have" and "contain" mean including but not limited to these.

[0083] In addition, in this document, the terms "upper", "lower", "left", "right", "front", "back", or "between" are only used to describe the relative positions between multiple elements, and can be extended to include translation, rotation, or mirroring. In addition, in this document, unless otherwise specified, "an element is on another element" or similar descriptions do not necessarily mean that the element contacts the other element.

[0084] In addition, unless the steps are specifically described or must occur in sequence, the order of the above steps is not limited to the above list, and can be changed or rearranged according to the required design. And the above embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments.

[0085] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. An aviation transient electromagnetic equal-amplitude in-phase parallel transmitter system, comprising: A power management unit for supplying power; The full-bridge inverter circuit unit includes a plurality of MOSFET full-bridge inverter modules arranged in parallel, each MOSFET full-bridge inverter module sends an equal-amplitude and same-phase bipolar parallel current pulse to a respective connected transmitting load, so that each transmitting load generates an electromagnetic field of equal amplitude and same phase, and each electromagnetic field of equal amplitude and same phase is superimposed and acts on the target to be measured; An active adaptive voltage-adjustable dual clamping unit, connected to the full-bridge inverter circuit unit, for clamping the rising edge and falling edge of each sub-pulse in the equal-amplitude and in-phase bipolar parallel current pulse; A control unit, used for generating a PWM timing logic control signal to control the full-bridge inverter circuit unit, so that each MOSFET full-bridge inverter module outputs equal-amplitude and same-phase bipolar parallel current pulses; as well as The detection unit is connected to the control unit, the full-bridge inverter circuit unit, and the active adaptive voltage-adjustable dual clamping unit respectively, and is used to detect the emission current, clamping current, and clamping voltage respectively, and feed back the detection results to the control unit.

2. The transmitter system according to claim 1, wherein the power management unit comprises: DC / DC main control circuit power module, which supplies power to the control unit; DC / DC power supply module, used for full-bridge inverter circuit unit to provide adjustable voltage; as well as DC / DC isolated drive circuit power module is used to provide the required voltage to the MOSFET driver.

3. According to the transmitter system of claim 1, each of the MOSFET full-bridge inverter modules includes a first MOSFET power switch group and a second MOSFET power switch group. By controlling the first MOSFET power switch group and the second MOSFET power switch group to be alternately turned on, the current direction on the transmitting load is made to flow in a forward direction or a reverse direction, thereby realizing the generation of equal-amplitude and in-phase bipolar parallel current pulses.

4. The transmitter system according to claim 1, wherein the active adaptive adjustable voltage double clamp module comprises: Adjustable high voltage DC power supply H ; A high voltage capacitor bank, comprising a plurality of capacitors connected in parallel to an adjustable high voltage power supply DC H High voltage capacitors at both ends; Power diode D13, connected in series with adjustable high voltage power supply DC H The output circuit is used to prevent the energy of the high-voltage capacitor bank from flowing back to the power supply and causing damage when the voltage is higher than the power supply voltage. The high-voltage capacitor discharge resistor R3 is connected in parallel to both sides of the high-voltage capacitor group, and is used to discharge the energy stored in the high-voltage capacitor group in time when the pulse current emission ends to avoid danger; and A plurality of clamped MOSFET power switches are respectively connected in series with each MOSFET full-bridge inverter module and then connected in parallel beside the high-voltage capacitor group.

5. The transmitter system according to claim 4, wherein the adjustable high voltage power supply DC H The control unit is connected to the control unit, and the control unit controls the adjustable high voltage power supply DC according to the transmission load parameters and the combined pulse parameters. H The output voltage of the adjustable high voltage DC power supply H The high-voltage capacitor is charged to a set constant voltage; the control unit controls multiple clamping MOSFET power switches to be turned on accurately for a set time at the rising edge of the equal-amplitude and in-phase bipolar parallel current pulse according to the combined pulse parameters to be emitted, so that the high-voltage capacitor group releases energy to the emission load through the MOSFET full-bridge inverter module at the rising edge of the current pulse, so that the current pulse is quickly established.

6. The transmitter system according to claim 4, wherein the high-voltage capacitor group absorbs the voltage spike generated by the transmitter load at the moment of shutdown, so that the current pulse drops rapidly and linearly.

7. The transmitter system according to claim 5, wherein the plurality of clamping MOSFET power switches cooperate with the high-voltage capacitor group to achieve double clamping of pulse adjustable voltage and adjustable intervention time, thereby improving the quality of the transmission waveform.

8. The transmitter system of claim 5, the combined pulse parameters comprising frequency, amplitude and width of the combined pulse.

9. The transmitter system according to claim 1, the control unit comprising: The adaptive adjustable voltage control module calculates and outputs the clamping voltage and clamping time based on the real-time detection results collected by the detection unit, thereby clamping the rising and falling edges of the current pulse.

10. A control method for the airborne transient electromagnetic equal-amplitude in-phase parallel transmitter system according to any one of claims 1 to 9, comprising: Charge the high-voltage capacitor bank and provide the same voltage to multiple MOSFET full-bridge inverter modules; Under the action of the supply voltage, multiple MOSFET full-bridge inverter modules send equal-amplitude and same-phase bipolar parallel current pulses to the connected transmitting loads, so that the superimposed electromagnetic field generated by the multiple parallel transmitting loads acts on the target to be measured; Active adaptive adjustable double clamping is performed on the rising edge and falling edge of each sub-pulse in the equal-amplitude and in-phase bipolar parallel current pulse; Detecting equal amplitude and same phase bipolar parallel current pulses, supply voltage, clamping current, and clamping voltage; as well as Different PWM timing logic control signals are issued based on the detection results to adjust the equal-amplitude and in-phase bipolar current pulses.

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