Self-contained output parameter adjustable magnetic field generating device and method thereof

Abstract

This invention discloses a self-contained magnetic field generator with adjustable output parameters and its method. The magnetic field generator comprises a main control unit, a battery unit, a shielding structure unit, and a Helmholtz unit. The main control unit and battery unit are enclosed within the shielding structure unit, effectively suppressing interference from these components on the stable magnetic field generated by the generator, thus improving the accuracy of the generator's parameter output. While meeting preset output value requirements, the generator can receive commands from an external calibration controller via the RS-232 interface reserved in the MCU control unit, enabling magnetic field output modes such as steady-state output, sine wave output, square wave output, and triangular wave output to suit different application scenarios. Through its structured design, powered by a rechargeable battery, and with integrated cabling for all functional units, this invention is suitable for outdoor applications without requiring extensive transportation, assembly, or external auxiliary equipment.

Description

Technical Field

[0001] This invention relates to the field of space magnetic field generating devices, and more specifically, to a self-contained magnetic field generating device and method with adjustable output parameters. Background Technology

[0002] Generating a known and controllable stable magnetic field environment within a specific spatial region is widely used in the operational status and performance parameter calibration scenarios of geophysical magnetic field information measurement devices. The use of programmable control for output magnetic field information is of great significance for the operational status and performance parameter calibration of magnetic field information measurement devices.

[0003] In related technologies, a stable magnetic field environment is typically generated within a specific spatial area using separate modules such as a Helmholtz coil, transmission cable, signal generator, and power supply. The physical parameters of the spatial magnetic field are then manually controlled by adjusting the output parameters of the signal generator. Because these are general-purpose devices with separate functional modules, they are usually designed for fixed or laboratory use. Furthermore, geophysical magnetic field information measurement operations are typically located in relatively remote areas or marine environments far from land. This imposes certain limitations on the use of magnetic field generating devices in specific locations and certain operational environments. Use in outdoor scenarios increases the complexity of equipment handling, debugging, and control, and the interface and accessory requirements for equipment connections are quite cumbersome. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing magnetic field generating devices that are too complex for outdoor and other work scenarios, and that are cumbersome to transport, debug, and control, and to provide a self-contained magnetic field generating device with adjustable output parameters.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A self-contained magnetic field generator with adjustable output parameters, the device comprising a main control unit, a battery unit, a shielding structure unit, and a Helmholtz unit;

[0007] The Helmholtz unit comprises two sets of skeleton structures and coil structures. In each set of skeleton and coil structures, the skeleton structure serves as the support carrier for the coil structure. The skeleton structure has grooves for circumferentially winding the coil structure, and the coil structure is continuously wound on the skeleton structure through the grooves. The two sets of skeleton structures and coil structures are coaxially arranged in a parallel and spaced manner to form a Helmholtz coil structure. The two skeleton structures are connected as one unit by several tubular shielding structure units, and all shielding structure units are evenly distributed at equal angles along the circumferential direction.

[0008] Both the main control unit and the battery unit are encapsulated in the inner cavity of the shielding structure unit, which shields the interfering magnetic signals generated by the battery unit and the main control unit.

[0009] The battery unit is used to provide operating power to the main control unit;

[0010] The main control unit includes a power supply unit, an MCU control unit, a reference voltage unit, a D / A unit, and a drive unit. The input terminal of the power supply unit is connected to the battery unit, and its output terminals are respectively connected to the MCU control unit, the reference voltage unit, the D / A unit, and the drive unit, providing suitable operating voltages for the MCU control unit, the reference voltage unit, the D / A unit, and the drive unit. The MCU control unit has a communication interface for connecting to an external calibration controller. The digital signal input terminal, the reference voltage input terminal, and the analog signal output terminal of the D / A unit are respectively connected to the MCU control unit, the reference voltage unit, and the drive unit. The drive unit connects to the two coil structures in the HOLM / Hertz unit, converting the analog signal output by the D / A unit into a drive signal and driving the two coil structures to generate a stable magnetic field environment.

[0011] Preferably, the battery unit is a rechargeable lithium-ion battery pack, which is fixed inside the shielding structure unit by a battery holder.

[0012] Preferably, the battery cell is designed to output a voltage of 7.4VDC.

[0013] Preferably, in addition to connecting the battery unit as a working power source, the power supply unit also has a reserved interface for connecting an external DC regulated power supply signal.

[0014] Preferably, the interface adopts a 5-24VCD wide voltage interface.

[0015] Preferably, the shielding structure unit is made of a soft magnetic material.

[0016] Preferably, the soft magnetic material is permalloy.

[0017] Preferably, the power supply unit outputs a 3.3V DC voltage.

[0018] Preferably, the input voltage of the reference voltage unit is 3.3V DC, and the reference voltage output to the D / A unit is 2.5V DC.

[0019] Preferably, there are three shielding structure units, which are evenly distributed along the circumference at a central angle of 120° to each other.

[0020] On the other hand, the present invention provides a control method for a magnetic field generator with adjustable self-capacitive output parameters according to any of the above-mentioned methods. The method is as follows: after starting and initializing the MCU control unit in the magnetic field generator, the serial port interrupt signal is monitored to obtain the message sent by the external calibration controller, and three working modes are executed according to different monitoring results: output preset value, set output parameters, and read set parameters.

[0021] a) If no serial port interrupt signal is detected, the output preset value working mode will be entered. This mode is a portable working mode for the self-contained magnetic field generator with adjustable output parameters that does not require external control. The MCU control unit will send the initial output parameters to the D / A unit in the form of digital signals so that the 50000nT steady magnetic field environment is generated inside the HOLM Hertz unit.

[0022] b) If a serial port interrupt signal is detected, and the control instruction parsed from the message conforming to the message specification is an output parameter setting instruction, then the device enters the output parameter setting working mode. In this mode, the self-capacitive output parameter adjustable magnetic field generator can control the output magnetic field environment to change in real time. Furthermore, this mode has multiple forms of magnetic field output instructions, including steady output, sine wave output, square wave output, and triangular wave output. The control logic for each magnetic field output instruction form is as follows:

[0023] In the steady output instruction mode, the MCU control unit loads the second setting value in the message, converts it into the corresponding digital signal output, controls the Helmholtz unit to generate a stable magnetic field output, and stores the second setting value in the register;

[0024] In the form of sinusoidal output instruction, the MCU control unit loads the period parameter, the first setting value and the second setting value in the message, and converts them into corresponding digital signal outputs. It controls the HOLM-Hertz unit to generate a periodic sinusoidal signal corresponding to the period parameter with the upper limit of the magnetic field being the first setting value and the lower limit being the second setting value, and stores the period parameter, the first setting value and the second setting value in the register.

[0025] In the form of square wave output command, the MCU control unit loads the period parameter, the first setting value and the second setting value in the message, and converts them into corresponding digital signal outputs. It controls the Helmholtz unit to generate a periodic square wave signal corresponding to the period parameter with the upper limit of the magnetic field being the first setting value and the lower limit being the second setting value, and stores the period parameter, the first setting value and the second setting value in the register.

[0026] In the form of triangular wave output command, the MCU control unit loads the period parameter, the first setting value and the second setting value in the message, and converts them into corresponding digital signal outputs. It controls the HOLM Hertz unit to generate a periodic triangular wave signal corresponding to the period parameter with the upper limit of the magnetic field being the first setting value and the lower limit being the second setting value, and stores the period parameter, the first setting value and the second setting value in the register.

[0027] c) If a serial port interrupt signal is detected, and the control instruction parsed from the message conforming to the message specification is a read setting parameter instruction, then the read setting parameter working mode is entered. In this mode, the self-contained magnetic field generator with adjustable output parameters packages the current output information according to the message specification and outputs it to the external calibration controller through the RS-232 communication protocol.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] This invention proposes a self-contained magnetic field generator with adjustable output parameters. Under the control of a calibration controller, the stable magnetic field generated within a specific spatial area can be programmably set. The generator itself is powered by a battery, and the main control unit and the various functional units within the battery unit are connected by cables and integrated into a shielded structural unit. This invention achieves portability and simplification of the magnetic field generator, improving its ease of carrying and operation. It requires no large amount of external equipment or complex transportation and assembly, making it suitable for outdoor use. Attached Figure Description

[0030] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used will be briefly introduced below. The drawings described below are only some embodiments of the present invention.

[0031] Figure 1 This is a schematic diagram of the structure of a self-contained magnetic field generator with adjustable output parameters according to the present invention.

[0032] Figure 2 This is a schematic diagram of the composition of a self-contained magnetic field generator with adjustable output parameters according to the present invention.

[0033] Figure 3 This invention relates to the message specifications and format of a self-contained magnetic field generator with adjustable output parameters.

[0034] Figure 4 This is a schematic diagram of the operation logic of the magnetic field generation control program for a self-contained magnetic field generator with adjustable output parameters according to the present invention.

[0035] The reference numerals in the figure are explained as follows:

[0036] 10: Main control unit, 20: Battery unit, 30: Power supply unit, 40: MCU control unit, 50: Reference voltage unit, 60: D / A unit, 70: Shielding structure unit, 80: Drive unit, 90: Holmhertz unit, 91: Frame structure, 92: Coil structure. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] The core of this invention is to provide a self-contained magnetic field generator with adjustable output parameters, which improves the portability of the magnetic field generator and reduces its complexity. Another key aspect of this invention is the provision of a serial port interface for receiving control commands from the magnetic field generator, which improves the portability of adjusting the magnetic field environment generated by the generator. This enhances the operability of the equipment and simplifies the adjustment of calibration parameters in geophysical magnetic field measurement operations or outdoor magnetic field calibration work.

[0039] The specific structure, principle, and working method of the self-contained adjustable output parameter magnetic field generator of the present invention will be described in detail below.

[0040] In a preferred embodiment of the present invention, a self-contained magnetic field generator with adjustable output parameters is provided. Figure 1 This is a schematic diagram of the structure of the self-contained, adjustable-output-parameter magnetic field generator. This device can be used to generate a stable magnetic field environment with adjustable parameters in a specific space environment. It has the advantages of simple structural design, portability, ease of operation, high safety, and high reliability. The specific components of the device can be divided into several parts: a main control unit 10, a battery unit 20, a shielding structure unit 70, and a Holmhertz unit 90.

[0041] The aforementioned Holmhertz unit 90 comprises two sets of skeleton structures 91 and coil structures 92. In each set of skeleton structures 91 and coil structures 92, the skeleton structure 91 serves as the supporting carrier for the coil structure 92. The skeleton structure 91 has grooves for circumferentially winding the coil structure 91, and the coil structure 91 is continuously wound onto the skeleton structure 91 through these grooves. The skeleton structure 92 can be made of a stable, non-deformable non-metallic material. The coil structure 91 has a fixed number of turns, and its initial magnetic field conversion coefficient is calibrated to a fixed value. After receiving the drive signal from the drive unit, the coil unit can generate the required magnetic field environment through electromagnetic induction. The number of turns wound in the coil unit needs to be designed and calculated to match the output signal of the MCU control unit in order to achieve the designed magnetic field environment generation function.

[0042] In order to generate a uniform magnetic field in a Helmholtz coil, the two sets of frame structures 91 and coil structures 92 need to be arranged coaxially in a parallel and spaced manner to form a Helmholtz coil structure.

[0043] In addition, the two skeleton structures 91 are connected as a whole by several tubular shielding structure units 70, all of which are evenly distributed at equal angles along the circumference. The shielding structure units 70 serve two purposes: firstly, to connect the two skeleton structures 91, making the entire magnetic field generating device a unified whole; secondly, to encapsulate the main control unit 10 and the battery unit 20, thereby shielding the interference magnetic signals generated by the battery unit 20 and the main control unit 10. Because the shielding structure unit 70 adopts a tubular structure with an internal cavity, both the main control unit 10 and the battery unit 20 in this invention need to be encapsulated within the cavity of the shielding structure unit 70. Encasing the main control unit 10 and the battery unit 20 within the shielding structure unit 70 effectively reduces the impact of their own magnetic interference on the device's performance. Furthermore, the integrated design of the shielding unit 70 and the support connection of the skeleton structure 92 further enhances the device's portability. The shielding structure units 70 can be made of soft magnetic materials, typically permalloy. The specific number of shielding structure units 70 can be adjusted according to actual needs. Figure 1 In the illustrated embodiment, three cylindrical shielding structure units 70 are provided, and the three shielding structure units 70 are evenly distributed along the circumference at a central angle of 120° to each other. The provision of shielding structure units 70 can greatly reduce the impact of interference signals on the magnetic field generating device, while effectively improving the compact design of the present invention and enhancing the portability and ease of use of the magnetic field generating device.

[0044] Figure 2This is a schematic diagram showing the connections of each unit in a self-contained, adjustable output parameter magnetic field generator according to the present invention. The battery unit 20 provides power to the main control unit 10. In this embodiment, the battery unit 20 uses a rechargeable lithium-ion battery pack, which is fixed inside the shielding structure unit 70 via a battery holder. The rechargeable lithium-ion battery pack can be designed with a universal USB interface as the charging interface, improving the portability of the magnetic field generator. The power supply unit 30 connects to the positive and negative terminals of the battery pack via two contacts, thereby introducing the battery pack voltage into the magnetic field generator to provide it with operating power. Furthermore, a switch can be installed at the positive terminal lead of the battery pack in the battery unit 20 to control the power-on and power-off operation of the magnetic field generator, improving the battery unit's efficiency and ensuring the magnetic field generator operates within a controllable time period.

[0045] See also Figure 2 As shown, the main control unit 10 includes a power supply unit 30, an MCU control unit 40, a reference voltage unit 50, a D / A unit 60, and a drive unit 80. The input terminal of the power supply unit 30 is connected to the battery unit 20, which provides DC power. In addition to connecting to the battery unit 30 as its operating power source, the input terminal of the power supply unit 30 also has a reserved interface for an external DC regulated power supply signal, allowing access to external DC power signals to ensure the effective operation of the magnetic field generator. The external DC regulated power supply signal of the power supply unit 30 uses a wide voltage input design, adaptable to various external power supply models, effectively expanding the power supply adaptability of the device. The output terminals of the power supply unit 30 are connected to the MCU control unit 40, the reference voltage unit 50, the D / A unit 60, and the drive unit 80, respectively, to provide suitable operating voltages for these components.

[0046] The MCU control unit 40 is equipped with a communication interface for connecting to an external calibration controller. The MCU control unit 40 can connect to the external calibration controller through this interface. The main control unit 10 communicates with the calibration controller via the RS-232 communication protocol conforming to the message specification, completing the external communication function of the self-contained adjustable output parameter magnetic field generator. The main control unit 10 adjusts the magnetic field parameters generated by the Helmholtz unit 90 through digital signals. The digital signal input terminal, reference voltage input terminal, and analog signal output terminal of the D / A unit 60 are respectively connected to the MCU control unit 40, the reference voltage unit 50, and the drive unit 80. The function of the reference voltage unit 50 is to receive the voltage signal from the power supply unit 30, generate a high-precision stable voltage signal, and provide it to the D / A unit 60 as the output reference voltage signal of the D / A unit 60, improving the accuracy of the output signal to meet the accuracy requirements of the magnetic field generated by the magnetic field generator. The drive unit 80 is connected to two coaxial parallel coil structures 92 in the Helmholtz unit 90 via cables, used to convert the analog signal output by the D / A unit 60 into a drive signal and drive the two coil structures 91 to generate a stable magnetic field environment. The drive unit receives the analog control signal output by the D / A converter, which can enhance the driving capability of the signal so as to drive the coil structure in the Holmhertz unit to generate a stable magnetic field environment.

[0047] Therefore, the working process of the main control unit 10 is as follows: the calibration controller sends message data packets to the MCU control unit 40 according to the RS-232 communication protocol. The MCU control unit 40 parses the data packets according to the message specifications to obtain the corresponding control commands, and then sends them to the D / A unit 60 in the form of digital signals. The D / A unit 60 is connected to the high-precision reference voltage unit 50. Under the digital signal control of the MCU control unit 40, it outputs a high-precision analog signal and converts it into a drive signal through the drive unit 80 before transmitting it to the coil structure 91, thereby generating the required stable magnetic field environment inside the HOLM-Hertz unit 90.

[0048] Since the main control unit 10 needs to be encapsulated inside the shielding structure unit 70, the main control unit 10 needs to adopt an integrated compact design, and the connecting cables of the battery unit 20 and the coil structure 92 can be soldered into the main control unit 10.

[0049] Furthermore, the specific voltage parameters of components such as battery unit 20, power supply unit 30, and reference voltage unit 50 need to be selected according to the power supply requirements of the specific electronic devices used in the device. In this embodiment of the invention, the battery unit 20 is designed to output a voltage of 7.4VDC. The external DC regulated power supply signal on the power supply unit 30 uses a 5-24VDC wide voltage interface, and the voltage output of the battery unit is converted internally to a 3.3VDC output voltage suitable for the magnetic field generator, thereby improving the stability of the output voltage information. The input voltage of the reference voltage unit 50 is 3.3V DC, and the reference voltage output to the D / A unit 60 is 2.5V DC.

[0050] In addition, the calibration controller and the MCU control unit 40 in this invention need to set up a corresponding communication protocol, specifying message specifications and formats. Figure 3 This invention relates to the message specifications and format of a self-contained magnetic field generator with adjustable output parameters. For example... Figure 3 As shown, an RS-232 communication protocol is provided for communication between a self-contained magnetic field generator with adjustable output parameters and an external calibration controller. The protocol message specifications are fixed, and the MCU control unit 40 parses the data packets according to the message specifications and performs logical control responses for setting and modifying magnetic field output parameters based on the control logic design. Under the premise of satisfying the preset value output function, the MCU control unit can receive commands from the external calibration controller through the reserved RS-232 interface to complete magnetic field output modes such as steady-state output, sine wave output, square wave output, and triangular wave output, adapting to different application scenarios.

[0051] In embodiments of the present invention, the above communication protocol can be designed according to the following steps:

[0052] The first step is to clarify the message specifications and format of the communication protocol. The protocol instruction packet includes a frame header, instruction code, instruction length, actual instruction, and frame tail. At the same time, the protocol also specifies the specific message format.

[0053] The second step, during development, involves parsing the received instruction packets according to the protocol specifications. Code is written to ensure that the self-contained, adjustable output parameter magnetic field generator does not parse instruction packets that do not conform to the protocol specifications, discarding them instead. For instruction packets that conform to the protocol specifications, the code should be able to interpret the meaning of each byte within the packet.

[0054] The third step is to write corresponding instruction judgment code based on the control instructions parsed from the instruction packet, enter the working mode specified by the communication protocol, send relevant control signals to the D / A unit and feed back the working status to the calibration controller;

[0055] The fourth step is to write instruction response code based on functional requirements, and execute control operations in the corresponding working mode according to control instructions. The specific control logic functions are as follows:

[0056] 1) Monitor the serial port data interface. If a control command is received, enter the command response working mode. If no control command is received, output according to the initial preset value.

[0057] 2) Set the output parameters of the self-contained adjustable magnetic field generator, write the output parameters into the flash memory that is not easy to erase, and convert the set parameters into D / A unit control commands and output them to the D / A unit.

[0058] 3) Package the current output settings information into a command packet that conforms to the message specification.

[0059] The fifth step is to write the return information code according to the communication protocol. After completing the output settings specified in the working mode, the setting results are generated into an instruction packet that conforms to the message specifications and format, and output through the serial port.

[0060] Based on the aforementioned communication protocol, portable functional calibration can be performed between the magnetic field generator and an external calibration controller. During calibration, the MCU control unit controls the output magnetic field value of the magnetic field generator, which has adjustable output parameters, depending on whether the calibration controller is connected. The MCU can be a Cortex-M core-based microprocessor, developed using C language based on the HAL library. The MCU control unit features low cost, low power consumption, high performance, multiple functions, stable operation, and convenient upgrade and maintenance. When the calibration controller is not connected, the MCU control unit outputs a preset value, controlling the D / A unit to output a steady signal applied to the HOMCH coil, generating a preset 50000nT steady magnetic field environment near the center of the HOMCH coil for portable functional calibration of the magnetic field measuring device. When connected to the calibration controller via a reserved RS-232 serial port, the MCU control unit receives calibration control command parameters and controls the D / A unit to output a corresponding signal applied to the HOMCH coil, generating a set magnetic field environment near the center of the HOMCH coil for portable functional calibration of the magnetic field measuring device.

[0061] Figure 4This is a schematic diagram of the program operation logic of the above-mentioned magnetic field generating device in this invention. After the self-contained adjustable output parameter magnetic field generating device powers on and the MCU control unit 40 completes the initialization settings, it listens for serial port interrupt signals. After the MCU control unit 40 detects the serial port interrupt, it parses the received interrupt signal. If the signal conforms to the message specification, it performs instruction parsing; if the signal does not conform to the message specification, it discards the interrupt signal to prevent false instructions from affecting the operation of the magnetic field generating device. Therefore, the self-contained adjustable output parameter magnetic field generating device includes working modes such as output preset value, setting output parameters, and reading setting parameters. In one embodiment of this invention, a specific control method for the above-mentioned self-contained adjustable output parameter magnetic field generating device is provided. The method is as follows: after starting and initializing the MCU control unit 40 in the magnetic field generating device, it monitors the serial port interrupt signal to obtain the message sent by the external calibration controller, and executes three working modes—output preset value, setting output parameters, and reading setting parameters—according to different monitoring results.

[0062] a) Output preset value working mode

[0063] If no serial port interrupt signal is detected, the output preset value working mode is entered. This mode is a portable working mode for the self-capable magnetic field generator with adjustable output parameters that does not require external control to work autonomously. The MCU control unit 40 sends the initial output parameters to the D / A unit 60 in the form of digital signals so that the 50000nT steady magnetic field environment is generated inside the HOLM Hertz unit 90.

[0064] b) Set output parameters and working mode

[0065] If a serial port interrupt signal is detected, and the control instruction parsed from a message conforming to the message specification is an output parameter setting instruction, then the device enters the output parameter setting working mode. In this mode, the self-capacitive output parameter adjustable magnetic field generator can control the output magnetic field environment to change in real time. Furthermore, according to the program logic control design, this mode has multiple forms of magnetic field output instructions, including steady output, sine wave output, square wave output, and triangular wave output. The control logic for each magnetic field output instruction form is as follows:

[0066] In the steady output instruction mode, the MCU control unit 40 loads the setting value 2 in the message and converts it into a corresponding digital signal output, controls the Helmholtz unit 90 to generate a stable magnetic field output, and stores the setting value 2 in the register;

[0067] In the form of sinusoidal output instruction, the MCU control unit 40 loads the period parameter, setting value 1 and setting value 2 in the message, and converts them into corresponding digital signal outputs. It controls the HOLM Hertz unit 90 to generate a periodic sinusoidal signal corresponding to the period parameter with the upper limit of the magnetic field being setting value 1 and the lower limit being setting value 2, and stores the period parameter, setting value 1 and setting value 2 in the designated register.

[0068] In the form of square wave output command, the MCU control unit 40 loads the period parameter, setting value 1 and setting value 2 in the message, and converts them into corresponding digital signal outputs. It controls the HOLM Hertz unit 90 to generate a periodic square wave signal corresponding to the period parameter with the upper limit of the magnetic field being setting value 1 and the lower limit being setting value 2, and stores the period parameter, setting value 1 and setting value 2 in the designated register.

[0069] In the form of triangular wave output command, the MCU control unit 40 loads the period parameter, setting value 1 and setting value 2 in the message, and converts them into corresponding digital signal outputs. It controls the HOLM Hertz unit 90 to generate a periodic triangular wave signal corresponding to the period parameter with the upper limit of the magnetic field being setting value 1 and the lower limit being setting value 2, and stores the period parameter, setting value 1 and setting value 2 in the designated register.

[0070] c) Read setting parameters for working mode

[0071] If a serial port interrupt signal is detected, and the control instruction parsed from the message conforming to the message specification is a read setting parameter instruction, then the device enters the read setting parameter working mode. In this mode, the self-contained magnetic field generator with adjustable output parameters packages the current output information according to the message specification and outputs it to the external calibration controller through the RS-232 communication protocol.

[0072] In summary, this invention improves the portability and simplifies the design of a stable magnetic field generator within a specific spatial region, enhances its maintainability, and reduces its complexity. Furthermore, by implementing a corresponding serial port control protocol, it elevates the ease of operation of the magnetic field generator, achieving concise control functionality.

[0073] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A self-contained magnetic field generator with adjustable output parameters, characterized in that, The device includes a main control unit (10), a battery unit (20), a shielding structure unit (70), and a Holmhertz unit (90). The Helmholtz unit (90) includes two sets of skeleton structures (91) and coil structures (92); in each set of skeleton structures (91) and coil structures (92), the skeleton structure (91) serves as the support carrier for the coil structure (92), and the skeleton structure (91) is provided with a circumferentially wound groove for the coil structure (91), and the coil structure (91) is continuously wound on the skeleton structure (91) through the groove; the two sets of skeleton structures (91) and coil structures (92) are arranged coaxially in a parallel and spaced manner to form a Helmholtz coil structure; the two skeleton structures (91) are connected to each other by a number of tubular shielding structure units (70), and all shielding structure units (70) are evenly distributed along the circumferential direction at equal angles; The main control unit (10) and the battery unit (20) are both encapsulated in the inner cavity of the shielding structure unit (70), and the shielding structure unit (70) shields the interference magnetic signals generated by the battery unit (20) and the main control unit (10); The battery unit (20) is used to provide operating power to the main control unit (10); The main control unit (10) includes a power supply unit (30), an MCU control unit (40), a reference voltage unit (50), a D / A unit (60), and a drive unit (80). The input terminal of the power supply unit (30) is connected to the battery unit (20), and its output terminal is connected to the MCU control unit (40), the reference voltage unit (50), the D / A unit (60), and the drive unit (80) respectively, for providing an appropriate working voltage for the MCU control unit (40), the reference voltage unit (50), the D / A unit (60), and the drive unit (80). The MCU control unit (40) is provided with a communication interface for connecting to an external calibration controller. The digital signal input terminal, the reference voltage input terminal, and the analog signal output terminal of the D / A unit (60) are connected to the MCU control unit (40), the reference voltage unit (50), and the drive unit (80) respectively. The drive unit (80) is connected to the two coil structures (92) in the HOLM Hertz unit (90), for converting the analog signal output by the D / A unit (60) into a drive signal and driving the two coil structures (91) to generate a stable magnetic field environment.

2. The self-contained magnetic field generator with adjustable output parameters according to claim 1, characterized in that, The battery unit (20) is a rechargeable lithium-ion battery pack, which is fixed inside the shielding structure unit (70) by a battery holder.

3. The self-contained magnetic field generator with adjustable output parameters according to claim 2, characterized in that, The battery cell (20) is designed to output a voltage of 7.4VDC.

4. The self-contained magnetic field generator with adjustable output parameters according to claim 1, characterized in that, In addition to connecting the battery unit (30) as a working power source, the power supply unit (30) also has a reserved external DC regulated power supply signal interface; the interface adopts a 5-24VCD wide voltage interface.

5. A self-contained magnetic field generator with adjustable output parameters according to claim 1, characterized in that, The shielding structure unit (70) is made of soft magnetic material.

6. A self-contained magnetic field generator with adjustable output parameters according to claim 5, characterized in that, The soft magnetic material is permalloy.

7. A self-contained magnetic field generator with adjustable output parameters according to claim 1, characterized in that, The power supply unit (30) outputs a voltage of 3.3V DC.

8. A self-contained magnetic field generator with adjustable output parameters according to claim 7, characterized in that, The input voltage of the reference voltage unit (50) is 3.3V DC, and the reference voltage output to the D / A unit (60) is 2.5V DC.

9. A self-contained magnetic field generator with adjustable output parameters according to claim 1, characterized in that, The shielding structure unit (70) consists of three units, which are evenly distributed along the circumference at a central angle of 120° to each other.

10. A control method for a self-contained magnetic field generator with adjustable output parameters according to any one of claims 1 to 9, characterized in that, After starting and initializing the MCU control unit (40) in the magnetic field generator, the serial port interrupt signal is monitored to obtain the message sent by the external calibration controller. Based on different monitoring results, three working modes are executed: output preset value, set output parameter, and read set parameter. a) If no serial port interrupt signal is detected, the output preset value working mode is entered. This mode is a portable working mode of the self-capable magnetic field generator with adjustable output parameters that does not require external control. The MCU control unit (40) sends the initial output parameters to the D / A unit (60) in the form of digital signals so that the 50000nT stable magnetic field environment is generated inside the HOLM Hertz unit (90). b) If a serial port interrupt signal is detected, and the control instruction parsed from the message conforming to the message specification is an output parameter setting instruction, then the device enters the output parameter setting working mode. In this mode, the self-capacitive output parameter adjustable magnetic field generator can control the output magnetic field environment to change in real time. Furthermore, this mode has multiple forms of magnetic field output instructions, including steady output, sine wave output, square wave output, and triangular wave output. The control logic for each magnetic field output instruction form is as follows: In the steady output instruction mode, the MCU control unit (40) loads the second setting value in the message and converts it into the corresponding digital signal output, controls the HOLM Hertz unit (90) to generate a stable magnetic field output, and stores the second setting value in the register; In the form of sinusoidal output instruction, the MCU control unit (40) loads the period parameter, the first setting value and the second setting value in the message, and converts them into corresponding digital signal outputs, controls the HOLM Hertz unit (90) to generate a periodic sinusoidal signal corresponding to the period parameter with the upper limit of the magnetic field being the first setting value and the lower limit being the second setting value, and stores the period parameter, the first setting value and the second setting value in the register; In the form of square wave output command, the MCU control unit (40) loads the period parameter, the first setting value and the second setting value in the message, and converts them into corresponding digital signal outputs, controls the HOLM Hertz unit (90) to generate a periodic square wave signal corresponding to the period parameter with the upper limit of the magnetic field being the first setting value and the lower limit being the second setting value, and stores the period parameter, the first setting value and the second setting value in the register; In the form of triangular wave output command, the MCU control unit (40) loads the period parameter, the first setting value and the second setting value in the message, and converts them into corresponding digital signal outputs, controls the HOLM Hertz unit (90) to generate a periodic triangular wave signal corresponding to the period parameter with the upper limit of the magnetic field being the first setting value and the lower limit being the second setting value, and stores the period parameter, the first setting value and the second setting value in the register; c) If a serial port interrupt signal is detected, and the control instruction parsed from the message conforming to the message specification is a read setting parameter instruction, then the read setting parameter working mode is entered. In this mode, the self-contained magnetic field generator with adjustable output parameters packages the current output information according to the message specification and outputs it to the external calibration controller through the RS-232 communication protocol.

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