CN110718352A - Device and method for generating repetitive pulse high-intensity magnetic field - Google Patents
Device and method for generating repetitive pulse high-intensity magnetic field Download PDFInfo
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- CN110718352A CN110718352A CN201911057408.1A CN201911057408A CN110718352A CN 110718352 A CN110718352 A CN 110718352A CN 201911057408 A CN201911057408 A CN 201911057408A CN 110718352 A CN110718352 A CN 110718352A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/20—Electromagnets; Actuators including electromagnets without armatures
- H01F7/202—Electromagnets for high magnetic field strength
- H01F7/204—Circuits for energising or de-energising
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
- H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
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Abstract
The invention provides a device and a method for generating a repetitive pulse high-intensity magnetic field, belonging to the field of high-intensity magnetic fields. The device comprises a magnet coil and a plurality of independent power supply units, wherein the independent power supply units are connected to two ends of the magnet coil in parallel; each power supply unit comprises an energy supply element, a follow current loop and an electric switch, wherein the follow current loop is connected with the energy supply element in parallel and then connected with the electric switch in series; the follow current loop comprises a follow current resistor and a one-way conduction element which are connected in series. The invention adopts the scheme that a plurality of sets of power supplies discharge a single magnet, can generate a repetitive pulse strong magnetic field by controlling the connection mode of a plurality of power supply units and a magnet coil and the discharge time sequence of an electric switch, and has the advantages of simple circuit topology and control system, diversified magnetic field waveforms, and random controllability of the polarity, the magnetic field intensity and the repetitive frequency of the magnetic field.
Description
Technical Field
The invention belongs to the technical field of strong magnetic fields, and particularly relates to a device and a method for generating a repetitive pulse strong magnetic field.
Background
Strong magnetic fields are used in modern scientific research to provide extremely important experimental conditions. The high magnetic field is generally provided by a permanent magnet or superconducting magnet system internationally, however, the permanent magnet system must adopt a mechanical motion mode to realize the magnetic field alternation of a magnetic refrigeration material, and the superconducting magnet system has the problems of low-temperature operation condition, quench limitation, high manufacturing cost and the like.
The pulse magnetic field is a magnetic field generated in a space by pulse current passing through a magnet coil, the direction of the current passing through the coil determines the polarity of the waveform of the magnetic field, and the pulse current is intermittently and repeatedly passed through the magnet coil to generate a repetitive pulse magnetic field. Compared with a permanent magnet or a superconducting magnet, the repeated pulse magnetic field system can control the existence of a magnetic field in a power-on mode, has the advantages of avoiding the mechanical reciprocating motion of the permanent magnet, and meanwhile, has lower manufacturing cost and higher achievable field intensity compared with the superconducting magnet system, and obtains extensive research. Wherein the magnetic field intensity, the magnetic field stability and the magnetic field waveform repetition frequency are key experimental parameters.
The current repetitive pulse electromagnetic system generally designs a power supply topology to control a large current waveform under a high voltage to generate a repetitive pulse magnetic field waveform. For example, the Wuhan national pulse laboratory uses an alternating current capacitor as a power supply, and controls a bidirectional anti-parallel thyristor to realize a repetitive pulse high-intensity magnetic field with positive and negative polarities in single discharge and 3T of magnetic field intensity. The system achieves the maximum energy utilization rate theoretically, but is limited by the power of a charger, the field intensity is not high, the waveform repetition frequency of a magnetic field is limited by the charging time of the power supply, and the polarity of the magnetic field can only be generated by positive and negative alternation. For another example, aiming at the repetitive pulse high-intensity magnetic field waveform required in scientific experiments such as neutron diffraction, magnetization and the like, the national laboratory of America takes a pulse generator as a power supply, provides two paths of current inputs, and is matched with the power supply input by taking a bidirectional antiparallel thyristor as a control switch, so that the bipolar repetitive pulse high-intensity magnetic field of 2Hz is realized. However, the system has complex equipment control, a plurality of system components and is not suitable for a large-inductance magnet due to the existence of energy-feeding inductance in the circuit.
Generally, the repetitive pulse high-intensity magnetic field device in the world currently has the following defects: (1) the power supply topology or the control system is complex, and the construction cost is high; (2) the application range of the magnet inductance in the electromagnetic device is limited by the energy-feeding inductance, and the generated magnetic field intensity is relatively low; (3) a set of power supply is adopted, the magnetic field intensity is limited by the power of a charger, and the repetition frequency is limited by the charging time of the power supply; (4) the waveform of the repeated pulse magnetic field is single.
Disclosure of Invention
Aiming at the defects of the existing scheme, the invention provides a device and a method for generating a repetitive pulse strong magnetic field, which realize the repetitive pulse magnetic field by adopting the scheme that a plurality of sets of power supplies discharge a single magnet, and aims to solve the technical problems that the topology and the control system of the existing system are complicated, the application range of the magnet inductor in an electromagnetic device is limited by energy feeding inductance, the magnetic field intensity is limited by power supply power, the repetitive frequency is limited by power supply charging time and the waveform of the repetitive magnetic field is single.
The invention provides a repetitive pulse high-intensity magnetic field generating device, which comprises a magnet coil and a plurality of independent power supply units, wherein the independent power supply units are connected in parallel at two ends of the magnet coil;
each power supply unit comprises an energy supply element, a follow current loop and an electric switch, wherein the follow current loop is connected with the energy supply element in parallel and then connected with the electric switch in series; the follow current loop comprises a follow current resistor and a one-way conduction element which are connected in series.
Further, the energy supply element is a capacitor, the unidirectional conducting element is a diode, and the electrical switch is a controllable thyristor.
The invention also provides a strong magnetic field generating method based on the repetitive pulse strong magnetic field generating device, which comprises the following steps:
(1) immersing the magnet coil in liquid nitrogen for cooling, and monitoring the cooling process of the magnet by measuring the change of the resistance value of the magnet;
(2) connecting the positive and negative poles of the plurality of power supply units with the wiring terminal of the magnet coil according to the polarity of a preset magnetic field waveform, and charging the energy supply element in each power supply unit to a preset voltage;
(3) the plurality of power supply units sequentially discharge the magnet coils according to a preset discharge timing.
Furthermore, after each discharge is finished, the resistance value change of the magnet coil caused by heat generation is monitored, and the preset voltage of each power supply unit is adjusted accordingly.
Further, in the step (2), the preset voltage is determined according to the magnetic field intensity required by the waveform.
Further, in the step (3), the discharge timing is set according to a magnetic field frequency required for a waveform.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, by arranging a plurality of independent power supply units, on one hand, the process of supplementing power supply energy in the discharging process can be avoided, so that the waveform frequency of the magnetic field is not limited by the charging time, and the magnetic field strength is not limited by the power of a charger; on the other hand, the polarity, the magnetic field intensity and the repetition frequency of the magnetic field waveform are controllable arbitrarily, and the magnetic field waveform is diversified;
(2) each power supply unit has the same composition, simple and reliable structure and no need of a complex control system;
(3) the power supply unit does not need to use energy feedback inductor, so the application range of the magnet inductor is not limited by the energy feedback inductor, and higher magnetic field intensity can be generated.
Drawings
FIG. 1 is a schematic circuit diagram of a repetitive pulse high-intensity magnetic field generating device.
FIG. 2 is a single polarity repetitive pulse high magnetic field simulation waveform.
FIGS. 3(a) and (b) show the waveforms of the single-polarity stepped repetitive pulse high-intensity magnetic field simulation.
FIG. 4 is a bipolar repetitive pulse high-intensity magnetic field simulation waveform.
Fig. 5(a) and (b) show bipolar stepped repetitive pulse high-intensity magnetic field simulation waveforms.
FIGS. 6(a) and (b) are multi-pattern repetitive pulse high-intensity magnetic field simulation waveforms.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 shows a repetitive pulse high-intensity magnetic field generating apparatus provided by an embodiment of the present invention, and for convenience of explanation, only the parts related to the embodiment of the present invention are shown.
A repetitive pulse high-intensity magnetic field generator comprises a magnet coil and multiple independent power supply units CM1、……CMNL, R are the inductance and the internal resistance of the magnet coil, respectively, the plurality of independent power supply units are all connected in parallel at two ends of the magnet coil;
wherein the basic composition of each power supply unit is the same, with the first power supply unit CM1For example, comprises a power supply element C1Freewheel circuit and electrical switch S1Said free-wheeling circuit and said energizing element C1Connected in parallel and then connected with the electrical switch S1Are connected in series; the follow current loop comprises follow current resistors R connected in seriesd1And a one-way conduction element D1。
Preferably, the energizing element C1Is a capacitor, a one-way conduction element D1Is a diode, an electrical switch S1Is a controllable thyristor.
In the prior art, because the power supply part of the repetitive pulse electromagnetic system only comprises a single energy supply element, for example, only one capacitor is arranged, and after the capacitor is discharged, the capacitor needs to be charged again immediately to perform next discharging. According to the invention, by arranging the plurality of independent power supply units, all the capacitors are fully charged before discharging, so that on one hand, the process of supplementing power supply energy in the discharging process can be avoided, the waveform frequency of a magnetic field is not limited by charging time, and the magnetic field strength is not limited by the power of a charger; on the other hand, the polarity, the magnetic field strength and the repetition frequency of the magnetic field waveform are arbitrarily controllable, and the magnetic field waveform is diversified. Moreover, each power supply unit has the same composition and is formed by combining conventional pulse power supplies, a power supply system does not need to be specially designed, the structure is simple and reliable, and a complex control system is not needed; further, no energy-feedback inductor is used in the power supply unit, so the applicable range of the magnet inductor is not limited by the energy-feedback inductor.
In an embodiment of the present invention, the magnetic field generating method based on the above repetitive pulse high-intensity magnetic field generating device includes the following steps:
(1) the magnet coils were immersed in liquid nitrogen to cool to 77K and the cooling process of the magnets was monitored by measuring the change in resistance of the magnets.
(2) And connecting the positive and negative poles of the plurality of power supply units with the terminal of the magnet coil according to the polarity of a preset magnetic field waveform, and charging the capacitor in each power supply unit to a set voltage.
The polarity of the magnetic field waveform depends on the power supply direction of the energy supply element, and when the positive and negative poles of the capacitor module are reversed or the power supply and the terminal ends of the magnet coil are reversed, the polarity of the waveform is changed accordingly. Further, the magnetic field intensity depends on the magnitude of the set voltage, and the magnetic field frequency is controlled by the discharge timing.
In an embodiment of the invention, the charging voltage and the triggering time of the capacitors in each power supply unit are determined using the simulink module simulation of matlab, based on the frequency of the repetitive pulses, the magnetic field strength and the polarity of the magnetic field waveform, in combination with the existing configuration of the capacitor module and the magnet coil parameters.
(3) And controlling the electrical switch to sequentially discharge the magnet coil according to a preset discharge time sequence.
If the connection directions of the power supply units and the terminals of the magnet coil are consistent, a single-polarity repetitive pulse high-intensity magnetic field waveform as shown in FIG. 2 is generated; on the basis, the preset voltage of each power supply module is adjusted, so that a unipolar step type pulse high-intensity magnetic field waveform as shown in fig. 3 is generated.
If the connection mode of the power supply units and the magnet coil terminals is in alternate direction connection (namely, positive connection-negative connection- … …), a bipolar high-frequency repetitive pulse high-intensity magnetic field waveform as shown in fig. 4 is generated, and on the basis of the bipolar high-frequency repetitive pulse high-intensity magnetic field waveform, the preset voltage of each power supply module is adjusted, so that a bipolar step type pulse high-intensity magnetic field waveform as shown in fig. 5 is generated.
If the connection direction of the plurality of power supply units and the terminal of the magnet coil is arbitrary and the discharge time is controlled as required, a variety of repetitive pulse high-intensity magnetic field waveforms of arbitrary polarity and frequency can be generated, which is exemplified by the waveform of the repetitive pulse high-intensity magnetic field of fig. 6.
And (3) adjusting: after each discharge, the resistance value change of the magnet coil caused by heat generation is monitored, and the set voltage of each power supply is adjusted accordingly.
Considering that the resistance of the magnet coil changes due to the heating of the magnet, in order to avoid the influence of the resistance change on the pulse current and the magnetic field intensity, the resistance value change of the magnet coil after each discharge due to the heating is monitored, then the set voltage of each power supply is adjusted, and the preset repetitive pulse high-intensity magnetic field waveform can be realized more accurately.
In the embodiment of the invention, a plurality of power supply units which are connected in parallel with two ends of the magnet coil are connected with the terminals of the magnet coil according to the preset waveform polarity of the magnetic field, and then the electric switch is controlled to discharge according to the discharge time sequence, so that the repetitive pulse strong magnetic field with the waveform intensity, polarity and frequency randomly changed can be generated. The repetitive pulse strong magnetic field generating device provided by the invention has the characteristics of simple and reliable power supply topology, simple control of an electromagnetic system, arbitrary controllability of the waveform intensity, the polarity and the frequency of a magnetic field, no limitation of the charging time of a power supply on the frequency of the magnetic field, no limitation of the field intensity of the magnetic field by the charging power and the like.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A repetitive pulse strong magnetic field generating device is characterized by comprising a magnet coil and a plurality of independent power supply units, wherein the independent power supply units are connected in parallel at two ends of the magnet coil;
each power supply unit comprises an energy supply element, a follow current loop and an electric switch, wherein the follow current loop is connected with the energy supply element in parallel and then connected with the electric switch in series; the follow current loop comprises a follow current resistor and a one-way conduction element which are connected in series.
2. The repetitive pulse high intensity magnetic field generating device of claim 1, wherein said energizing element is a capacitor.
3. The repetitive pulse high intensity magnetic field generating device of claim 1, wherein said one-way conductive element is a diode.
4. The repetitive pulsed high intensity magnetic field generating device of claim 1, wherein said electrical switch is a controllable thyristor.
5. The method for generating a high intensity magnetic field according to any one of claims 1 to 4, comprising the steps of:
(1) immersing the magnet coil in liquid nitrogen for cooling, and monitoring the cooling process of the magnet by measuring the change of the resistance value of the magnet;
(2) connecting the positive and negative poles of the plurality of power supply units with the wiring terminal of the magnet coil according to the polarity of a preset magnetic field waveform, and charging the energy supply element in each power supply unit to a preset voltage;
(3) and controlling the electrical switch to sequentially discharge the magnet coil according to a preset discharge time sequence.
6. The strong magnetic field generating method according to claim 5, wherein after each discharge is completed, a change in resistance value of the magnet coil due to heat generation is monitored, and the preset voltage of each power supply unit is adjusted accordingly.
7. The strong magnetic field generating method according to claim 5, wherein in said step (2), said preset voltage is determined according to a magnetic field intensity required for a waveform.
8. The strong magnetic field generating method according to claim 5, wherein in said step (3), said discharge timing is set according to a magnetic field frequency required for a waveform.
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| CN201911057408.1A CN110718352A (en) | 2019-10-31 | 2019-10-31 | Device and method for generating repetitive pulse high-intensity magnetic field |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111416544A (en) * | 2020-03-18 | 2020-07-14 | 华中科技大学 | Flat-top pulse high-intensity magnetic field generating device |
| CN112865471A (en) * | 2021-01-13 | 2021-05-28 | 华中科技大学 | Teaching instrument for converting electromagnetic energy into kinetic energy |
| CN113794363A (en) * | 2021-08-18 | 2021-12-14 | 华中科技大学 | Flat-top magnetic field topological circuit and control method thereof |
| CN114512297A (en) * | 2022-01-17 | 2022-05-17 | 华中科技大学 | Magnetic gain switch and method based on flat-top pulse magnetic field |
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2019
- 2019-10-31 CN CN201911057408.1A patent/CN110718352A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111416544A (en) * | 2020-03-18 | 2020-07-14 | 华中科技大学 | Flat-top pulse high-intensity magnetic field generating device |
| CN112865471A (en) * | 2021-01-13 | 2021-05-28 | 华中科技大学 | Teaching instrument for converting electromagnetic energy into kinetic energy |
| CN112865471B (en) * | 2021-01-13 | 2022-05-17 | 华中科技大学 | Teaching instrument for converting electromagnetic energy into kinetic energy |
| CN113794363A (en) * | 2021-08-18 | 2021-12-14 | 华中科技大学 | Flat-top magnetic field topological circuit and control method thereof |
| CN113794363B (en) * | 2021-08-18 | 2024-05-14 | 华中科技大学 | Flat-top magnetic field topology circuit and control method thereof |
| CN114512297A (en) * | 2022-01-17 | 2022-05-17 | 华中科技大学 | Magnetic gain switch and method based on flat-top pulse magnetic field |
| CN114512297B (en) * | 2022-01-17 | 2022-12-02 | 华中科技大学 | Magnetic gain switch and method based on flat-top pulse magnetic field |
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