CN210578465U

CN210578465U - Pulse strong magnetic field generator with recoverable energy

Info

Publication number: CN210578465U
Application number: CN201921865885.6U
Authority: CN
Inventors: 彭涛; 李亮; 江山; 王爽
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-05-19
Anticipated expiration: 2029-11-04

Abstract

The utility model discloses a recoverable pulse high-intensity magnetic field produces device of energy belongs to high-intensity magnetic field technical field. The device comprises a main discharging loop, a transformer discharging loop, a follow current loop and a charging loop; the main discharge loop comprises a first energy storage element, a first switch, a first one-way conduction element and a magnet coil which are connected in series; the charging loop comprises a second energy storage element, a primary coil of the transduction transformer, a second switch and a second one-way conduction element which are connected in series; the transformer discharging loop and the follow current loop are connected in parallel at two ends of the first energy storage element; the transformer discharging loop comprises a secondary side coil of the transduction transformer and a third one-way conduction element which are connected in series, and the follow current loop comprises a third switch and a fourth one-way conduction element which are connected in series. The utility model discloses a coupling effect of transduction transformer has realized the energy recuperation of the strong magnetic field of pulse production in-process, has the characteristics that reduce the magnet and generate heat, energy reuse.

Description

Pulse strong magnetic field generator with recoverable energy

Technical Field

The utility model belongs to the technical field of high-intensity magnetic field, more specifically relates to a recoverable pulse high-intensity magnetic field produces device of energy.

Background

The pulse strong magnetic field is one of the most effective tools in modern scientific experiments, and provides a lot of scientific opportunities for generating new technologies and proposing new concepts. The pulse high-intensity magnetic field is a magnetic field formed by instantly releasing large energy to a magnet coil to generate pulse current in space, so that different magnetic field waveforms can be obtained by adopting different treatment modes for energy in the process of generating the pulse high-intensity magnetic field, and further different influences can be generated on test results.

In electromagnetic forming application, the waveform of the magnetic field directly influences induced eddy current in a formed test piece, and the forming effect of a forming mode taking electromagnetic force formed by interaction of the induced eddy current in the test piece and a pulse strong magnetic field in space as driving force is directly influenced. At present, capacitors are used at home and abroad as power supplies to discharge to coils to obtain a pulse current waveform with a large change rate, and the current waveform is an attenuation oscillation waveform, as shown by a dotted line in fig. 1. However, the magnitude of the induced eddy current mainly depends on the rising phase of the pulse current, and the damping oscillation phase of the current rather enhances the rebound and wrinkling degree of the test piece. In Wuhan's national laboratory of high-intensity pulsed magnetic field, the follow current loop is added to the circuit to solve the above problem, but at the same time, the pulse width of the current waveform is increased, as shown by a dotted line in FIG. 1, the heating of the magnet coil is aggravated in the first oscillation period of the current, and the performance of the magnet is reduced.

Under the condition of not changing the waveform of the pulse magnetic field, the recovery and the reutilization of electromagnetic energy are key technologies for realizing the repetitive pulse strong magnetic field. The repetitive pulse high-intensity magnetic field is used as an extremely important experimental condition in modern scientific research and is widely applied to basic scientific research such as neutron diffraction, magnetization and the like. Energy feedback inductance is introduced into the power supply topological structure design in the national pulsed high-intensity magnetic field laboratory, and although energy recycling is realized and a 2Hz repeated pulsed high-intensity magnetic field is generated, the problems that the magnetic load inductance is limited by the energy feedback inductance and the magnetic field repetition frequency is limited by the charging power still exist. Therefore, the Wuhan national pulsed high-intensity magnetic field laboratory realizes the 50Hz high-frequency repeated pulsed high-intensity magnetic field by using a plurality of sets of power supply devices in parallel and adopting a mode of controlling a discharge time sequence, but the repeated pulse times are limited by the configuration number of the power supply devices, and the relative manufacturing cost is higher.

Generally, the conventional pulse high-intensity magnetic field generating device has the defects of single energy processing mode, large energy consumption, low utilization efficiency and poor economical efficiency. In different applications, different disadvantages also exist: in the electromagnetic forming technology, the phenomenon of rebounding and wrinkling of a test piece in the forming process is aggravated in the current waveform generated by the conventional device; in the technique of the repetitive pulse strong magnetic field, the number of repetitive pulses is limited by the configuration number of power supplies, and the construction cost is high.

The utility model provides a recoverable pulse high-intensity magnetic field produces device can eliminate the shock stage of electric current wave form under the circumstances of the rising stage of not changing the electric current wave form and pulse width, applies to the resilience and the phenomenon of corrugating that electromagnetic forming technique can improve the test piece. Meanwhile, the device realizes energy recovery in the process of forming the pulse magnetic field waveform, and is expected to solve the technical problem that the number of repeated pulses is limited by the configuration number of power supply devices.

Disclosure of Invention

To the above defect of prior art or improve the demand, the utility model provides a recoverable pulse high-intensity magnetic field produces device of energy aims at solving the energy recovery problem in the current pulse high-intensity magnetic field, reduces energy loss to improve the pulse magnetic field waveform.

In order to achieve the purpose, the utility model provides a pulse strong magnetic field generating device with recoverable energy, which comprises a main discharging loop, a transformer discharging loop, a follow current loop and a charging loop;

the main discharge circuit comprises a first energy storage element (C1), a first switch (S1), a first one-way conduction element (D1) and a magnet coil which are connected in series;

the charging loop comprises a second energy storage element (C2), a primary coil of the transduction transformer, a second switch (S2) and a second one-way conduction element (D2) which are connected in series;

the transformer discharging loop and the follow current loop are connected in parallel to two ends of the first energy storage element (C1); wherein the transformer discharge circuit comprises a series connection of a secondary winding of the transduction transformer and a third unidirectional conductive element (D3), and the freewheeling circuit comprises a series connection of a third switch (S3) and a fourth unidirectional conductive element (D4).

Further, the energy storage element is a capacitor, and the unidirectional conducting element is a diode.

Further, after the first energy storage element (C1) starts to discharge, the discharge current flows through the magnet coil and then flows back to the first energy storage element (C1) to charge the first energy storage element in a reverse direction; after the first-time discharging is finished, the reverse discharging current of the first energy storage element (C1) passes through the transformer discharging loop to perform reverse discharging on the secondary coil of the transformer; at this time, the inductive current is generated in the charging loop by the transducer transformer coupling, and the second energy storage element (C2) is charged.

The utility model discloses an energy recovery under the strong magnetic field of pulse has been realized to the transduction transformer, has the advantage that reduces the loss, promotes energy utilization, reduces magnet coil and generate heat, has unique advantage in many application occasions simultaneously:

in the technical field of electromagnetic forming, compared with other circuit structures, the utility model has the advantages that the waveform of the magnetic coil in the current rising stage is kept unchanged, the size of the induced eddy current cannot be influenced, meanwhile, the rebound and wrinkling conditions of the test piece are improved because the current oscillation attenuation stage does not exist, the calorific value of the magnetic coil is reduced, and the performance of the magnetic coil is ensured;

in the intense magnetic field of repetitive pulse, the utility model discloses owing to adopt two power supplies to discharge to single magnet, improved the problem that magnetic field repetition frequency received the time limit of charging, carry out energy recuperation simultaneously, the repetitive pulse number of times will no longer be subject to power supply unit's configuration number.

Drawings

FIG. 1 is a schematic diagram comparing waveforms of different magnetic field devices in electromagnetic forming.

Fig. 2 is a schematic structural diagram of an energy-recoverable pulsed high-intensity magnetic field generating device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in 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. 2 shows an energy-recoverable pulsed high-intensity magnetic field generating device provided by an embodiment of the present invention, and for convenience of explanation, only the circuit part related to the present invention is shown.

The device comprises a main discharging loop, a transformer discharging loop, a follow current loop and a charging loop;

a first capacitor C1, a first switch S1, a first diode D1 and a magnet coil are sequentially connected in series in the main discharge loop, and the inductance and the internal resistance of the magnet coil are respectively marked as L and R1;

the charging loop comprises a second capacitor C2, a primary coil of the transduction transformer, a second switch S2 and a second diode D2 which are sequentially connected in series, and the charging loop is coupled with the main discharging loop through the transduction transformer;

the transformer discharging loop and the follow current loop are connected in parallel at two ends of the first capacitor C1; the transformer discharging loop comprises a secondary side coil of the transduction transformer and a third diode D3 which are sequentially connected in series, and the freewheeling loop comprises a third switch S3 and a fourth diode D4 which are sequentially connected in series.

The capacitor can be replaced by other energy storage elements for realizing the same function to be used as a power supply, and the diode can be replaced by other one-way conduction elements for realizing the same function.

The utility model discloses an in the embodiment, under the condition of afterflow circuit disconnection, first electric capacity discharges to magnet coil through main discharge circuit, produces pulsed magnetic field waveform, discharges to the transduction transformer after first electric capacity reverse charging accomplishes afterwards, and at this moment, the afterflow circuit switches on, and the transformer discharge circuit will realize the process to energy recuperation to the charging of second electric capacity through the transduction transformer. The utility model discloses an energy recuperation under the high magnetic field of pulse is realized to the coupling effect of transduction transformer, provides new thinking for electromagnetic forming and repetitive pulse electromagnetic system design.

In an embodiment of the present invention, a magnetic field generating method based on the pulse high-intensity magnetic field generating device with recoverable energy includes the following steps:

a preparation stage: the first capacitor C1 is charged to a predetermined voltage level, which depends on the desired magnetic field strength.

And (3) a discharging stage: the first switch S1 and the second switch S2 are closed, the first capacitor C1 starts discharging, the current passes through the first switch S1, the first diode D1 and the magnet coil in sequence to generate a pulse magnetic field, and the discharging current returns to the first capacitor C1 after flowing through the magnet coil to reversely charge the first capacitor C1. After the first discharge is completed, the reverse discharge current of the first capacitor C1 passes through the transformer discharge circuit to reversely discharge the secondary coil of the transformer, and the reverse discharge current no longer passes through the magnet coil due to the action of the first diode D1, and at this time, the third switch S3 of the freewheeling circuit is turned on.

A charging stage: when the secondary coil of the transformer is reversely discharged, the induced current passes through the primary coil of the transduction transformer, the second diode D2 and the second switch S2 to charge the second capacitor C2 through the coupling effect of the transduction transformer until the charging process is finished, and the solid line waveform shown in fig. 1 is generated.

Fig. 1 shows magnet coil current waveform among the current electromagnetic system, the utility model discloses in the embodiment of the voltage waveform that charges behind magnet coil current waveform and energy recuperation to second electric capacity C2, it can be seen from the picture, compare among the current electromagnetic system, the electric current that flows through magnet coil does not have the decay and vibrates the part, and the pulse width of current waveform also does not take place obvious increase, consequently can apply to among the electromagnetic forming technique, change the current waveform among the magnet coil, and then improve the phenomenon that test piece kick-backed and corrugate among the electromagnetic forming process among the current device, reduce magnet coil's generating heat simultaneously, prolong its life.

The utility model discloses realize recovery and reuse of energy, can be applied to and optimize the repetitive pulse and produce the device. In the implementation mode of the repetitive pulse high-intensity magnetic field proposed by the Wuhan national pulsed high-intensity magnetic field laboratory, the frequency of the generated repetitive pulses is high but the number of the repetitive pulses depends on the number of power supply devices, and one power supply device can only generate one single pulse waveform in one experiment, so that the problem of limited continuity of the high-frequency repetitive pulses exists. The utility model provides a recoverable pulse high-intensity magnetic field device of energy can realize the energy recovery between the different power and utilize the mutual coordination between the different electric capacity to retrieve the energy, is expected to solve the waveform continuity problem among the above-mentioned device to improve the repetitive pulse frequency and break through the problem that the repetitive pulse number is subject to power supply unit configuration number.

It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims

1. A pulse high-intensity magnetic field generating device with recoverable energy is characterized by comprising a main discharging loop, a transformer discharging loop, a follow current loop and a charging loop;

the transformer discharging loop and the follow current loop are connected in parallel to two ends of the first energy storage element (C1); wherein the transformer discharge circuit comprises a secondary winding of the transduction transformer and a third unidirectional conductive element (D3) connected in series.

2. The apparatus of claim 1, wherein the freewheel circuit includes a third switch (S3) and a fourth one-way conducting element (D4) connected in series.

3. The apparatus according to claim 2, wherein said energy storage element is a capacitor.

4. The apparatus of claim 2, wherein said unidirectional conducting element is a diode.

5. The apparatus according to claim 2, wherein after the first energy storage element (C1) starts to discharge, the discharge current flows through the magnet coil and then flows back to the first energy storage element (C1) to charge it reversely; after the first-time discharging is finished, the reverse discharging current of the first energy storage element (C1) passes through the transformer discharging loop to perform reverse discharging on the secondary coil of the transformer; at this time, the second energy storage element (C2) is charged by a transducer transformer coupling, which generates an induced current in the charging loop.