CN117713758A - Unipolar repetitive pulse magnetic field system - Google Patents
Unipolar repetitive pulse magnetic field system Download PDFInfo
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- CN117713758A CN117713758A CN202311845309.6A CN202311845309A CN117713758A CN 117713758 A CN117713758 A CN 117713758A CN 202311845309 A CN202311845309 A CN 202311845309A CN 117713758 A CN117713758 A CN 117713758A
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- 230000003252 repetitive effect Effects 0.000 title claims abstract description 17
- 238000007600 charging Methods 0.000 claims abstract description 101
- 239000003990 capacitor Substances 0.000 claims abstract description 90
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- 238000007599 discharging Methods 0.000 claims abstract description 30
- 238000010277 constant-current charging Methods 0.000 claims abstract description 8
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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 discloses a unipolar repetitive pulse magnetic field system. The system comprises: the primary energy supply circuit, the charging system, the charging polarity conversion circuit, the discharging circuit and the magnet are sequentially connected; the primary energy supply circuit provides electric energy; the charging system carries out constant current charging on the subsequent circuit; the charging polarity conversion circuit is a thyristor bridge circuit and is connected with the discharging circuit through a capacitor, the charging polarity conversion circuit selectively triggers a thyristor switch according to the polarity of the capacitor, converts the charging polarity of the thyristor bridge circuit and charges the capacitor to a positive polarity voltage preset value or a negative polarity voltage preset value; the discharging circuit is a thyristor bridge circuit, selectively triggers a thyristor switch according to the polarity of a capacitor, and discharges the positive/negative polarity of a magnet by the capacitor to generate a unipolar repeated pulse magnetic field. The high-inductance pulse magnet is applied to the occasion of high voltage and high current, and the effects of improving the energy utilization rate and the repetition frequency and reducing the system cost are achieved.
Description
Technical Field
The invention belongs to the technical field of a pulse strong magnetic field, and particularly relates to a unipolar repeated pulse magnetic field system.
Background
The pulsed high-intensity magnetic field technology has been widely used in numerous discipline fields including solid state physics, chemistry, medicine, plasma science, and high energy physics, among others, at the brand angle in modern basic scientific research. In order to meet the scientific research requirements of various discipline fields, the pulse strong magnetic field technology develops a plurality of branches, including a flat-top pulse strong magnetic field, a long pulse width pulse strong magnetic field, a high field strength pulse strong magnetic field, a repeated pulse strong magnetic field and the like. In particular, the repeated pulse strong magnetic field technology refers to the generation of a pulse strong magnetic field at a certain repetition frequency, and is widely applied to the scientific research and modern industrial fields such as neutron scattering, magnetic refrigeration and the like due to the dual advantages of high magnetic field strength and adjustable repetition frequency.
The pulse power supply generally adopts a capacitive power supply, and stores energy in the form of electric field energy through a high-voltage capacitor charging device, so that the pulse power supply has the characteristic of high-efficiency energy storage. Compared with the traditional single pulse, the repeated pulse technology is more complex to realize, longer working time and higher working frequency are needed, and therefore, higher requirements are put on the charging power of a power supply, the heat dissipation efficiency of a magnet and the stability of a system. During the generation of the repeated pulsed strong magnetic field, joule heat of the magnet and the circuit causes energy losses, however, it is difficult to recover these lost energies in a very short time due to the power limitation of the primary energy source device, thereby limiting the frequency of the repeated pulses.
In order to reduce the power requirements of the charging device, researchers in the united states, japan and china currently use energy feed branches connected across the capacitor, consisting of diodes and energy feed inductors, for the recycling of energy. In this circuit topology, the values of the magnet inductance and the energy feedback inductance should be comparable in order to effectively achieve energy feedback. If the feed inductance value is set too large, this will result in an increase in the loss of energy on the feed inductance coil, thereby reducing the energy utilization. If the energy feedback inductance value is too small, the energy feedback function cannot be realized. Therefore, in order to avoid excessive energy loss on the energy feedback inductor, the energy feedback inductance value should be kept within a moderate range, which also limits the magnet inductance value, and the scheme is mainly applicable to small-inductance pulse magnets to generate a short-pulse magnetic field. Aiming at the problems, a learner adopts an IGBT full-bridge circuit to realize energy feedback, but the withstand voltage level and the current-resisting level of the IGBT are low, and a plurality of IGBTs are often required to be connected in series to work in a large-voltage occasion, so that the cost is increased.
Therefore, the short pulse magnetic field generating circuit adopting the energy feedback branch in the prior art is limited by the energy feedback inductance value, is only suitable for small-inductance pulse magnets, and adopts an IGBT full-bridge circuit to carry out energy feedback, thereby having higher cost.
Disclosure of Invention
Aiming at the defects of the related art, the invention aims to provide a unipolar repetitive pulse magnetic field system, and aims to solve the problems that the prior art is limited by an energy feedback inductance value, is only suitable for small-inductance pulse magnets and has higher cost by adopting an IGBT full-bridge circuit.
To achieve the above object, the present invention provides a unipolar repetitive pulse magnetic field system comprising: the primary energy supply circuit, the charging system, the charging polarity conversion circuit, the discharging circuit and the magnet are sequentially connected;
the primary energy supply circuit is used for providing electric energy;
the charging system comprises an LC resonance circuit and is used for carrying out constant-current charging on a subsequent circuit;
the charging polarity conversion circuit is a thyristor bridge circuit and passes through a capacitor C O The charge polarity conversion circuit is connected with the discharge circuit and is used for converting the charge polarity according to the capacitor C O Selectively triggering a positive polarity thyristor switch or a negative polarity thyristor switch, converting the charging polarity of the thyristor bridge circuit, and connecting a capacitor C O Charged to the preset positive voltage U m Or negative polarity voltage preset value-U m ；
The discharging circuit is a thyristor bridge circuit and is used for controlling the capacitor C O Selectively triggering the thyristor switch to realize the capacitance C O Discharging the magnet positively, or, capacitance C O The magnet is negatively discharged to generate a single-polarity repeated pulse magnetic field.
Optionally, the positive polarity thyristor switch in the charging polarity conversion circuit includes a first thyristor T 1 And a third thyristor T 3 The negative polarity thyristor switch comprises a second thyristor T 2 And a fourth thyristor T 4 The method comprises the steps of carrying out a first treatment on the surface of the First thyristor T 1 Cathode of (c) and second thyristor T 2 Is connected with the anode of the first thyristor T 1 Anode and fourth thyristor T 4 Anode connection of the second thyristor T 2 Cathode and third gate of (C)Tube T 3 Cathode connection of fourth thyristor T 4 Cathode and third thyristor T 3 Is connected with the anode of the battery;
capacitor C O Is connected with one end of a first thyristor T 1 The other end is connected with a fourth thyristor T 4 Is connected with the cathode of the battery;
the charging polarity conversion circuit is a capacitor C O Positive polarity charging process: a first thyristor T triggering the charge polarity conversion circuit 1 And a third thyristor T 3 The charging system charges the capacitor C O Charged to a positive voltage preset value U m ；
The charging polarity conversion circuit is a capacitor C O Negative polarity charging process: a third thyristor T triggering the charge polarity switching circuit 2 And a fourth thyristor T 4 The charging system charges the capacitor C O Charging to negative polarity voltage preset value-U m 。
Optionally, the discharging circuit comprises a thyristor bridge circuit formed by four thyristors, and a fifth thyristor T 5 Cathode and sixth thyristor T 6 Cathode connection of fifth thyristor T 5 Anode and eighth thyristor T 8 Cathode connection of a sixth thyristor T 6 Anode and seventh thyristor T 7 Cathode connection of eighth thyristor T 8 Anode and seventh thyristor T 7 Is connected with the anode of the battery;
capacitor C O One end of the fifth thyristor T 5 The other end is connected with a sixth thyristor T 6 Is connected with the anode of the battery; one end of the magnet is connected with a fifth thyristor T 5 The other end is connected with an eighth thyristor T 8 Is connected with the anode of the battery;
capacitor C O And performing a positive polarity discharge process through the discharge circuit: a fifth thyristor T triggering the discharge circuit 5 And a seventh thyristor T 7 Make the capacitor C O Discharging the magnet to generate a pulse strong magnetic field;
capacitor C O And carrying out a negative polarity discharging process through the discharging circuit: triggering the dischargeSixth thyristor T of an electrical circuit 6 And an eighth thyristor T 8 Make the capacitor C O The magnet is discharged to generate a pulsed strong magnetic field.
Optionally, during positive polarity discharge, a current I follows the magnet L Attenuation of the current I of the magnet L Counter capacitor C O Reverse charging to form back pressure-U C0 Subsequently, the charging system and the charging polarity switching circuit pair capacitor C O Charging until reaching negative polarity voltage preset value-U m ；
During discharge of negative polarity, current I follows the magnet L Attenuation of the current I of the magnet L Counter capacitor C O Reverse charging to form back pressure U C0 The charging system and the charging polarity conversion circuit pair capacitor C O Charging until reaching the preset positive voltage U m 。
Optionally, the capacitor C O The positive polarity discharge and the negative polarity discharge are alternately performed at uniform intervals, and the magnets generate uniformly spaced magnet currents of a single polarity and generate repeated pulse magnetic fields of the single polarity.
Optionally, the charging system comprises four insulated gate bipolar transistors, four diodes and an LC oscillating circuit; four insulated gate bipolar transistors form a first switch matrix, and four diodes form a second switch matrix; the LC oscillating circuit is connected with the first switch matrix and is connected with the second switch matrix through a transformer;
in the first switch matrix, a first insulated gate bipolar transistor Q 1 Collector of (d) and fourth insulated gate bipolar transistor Q 4 Is connected with the collector of the first insulated gate bipolar transistor Q 1 Emitter of (c) and second insulated gate bipolar transistor Q 2 Collector connection of second insulated gate bipolar transistor Q 2 Emitter and third insulated gate bipolar transistor Q 3 Emitter connection of a fourth insulated gate bipolar transistor Q 4 Emitter and third insulated gate bipolar transistor Q 3 Is connected with the collector electrode;
one end of the LC oscillating circuit is connected with the first insulated gate bipolar transistorBody tube Q 1 The other end is connected with the fourth insulated gate bipolar transistor Q 4 Emitter connection of (a);
in the second switching matrix, a first diode D 1 Positive electrode of (D) and second diode D 2 Cathode of first diode D 1 Cathode of (D) and fourth diode D 4 Is connected with the negative pole of the second diode D 2 Positive electrode of (D) and third diode D 3 A fourth diode D 4 Positive electrode of (D) and third diode D 3 Is connected with the negative electrode of the battery;
the primary side of the transformer is connected with the LC oscillating circuit, and one end of the secondary side of the transformer is connected with a first diode D 1 Is connected with the positive electrode of the third diode D 3 Is connected to the negative electrode of the battery.
Optionally, the primary energy supply circuit is a storage battery or a rectifying and filtering power supply.
By the above technical scheme, compared with the prior art, the invention can obtain the following
The beneficial effects are that:
1. the embodiment of the invention provides a unipolar repetitive pulse magnetic field system, wherein a charging polarity conversion circuit and a discharging circuit both adopt a thyristor full-bridge circuit and are based on a capacitor C O Selectively triggering the thyristor switch to realize the capacitance C O Charged with positive/negative polarity of (C) and pass through capacitor C O The magnetic body is subjected to unipolar repeated discharge to generate unipolar repeated pulse magnetic fields, so that the energy is repeatedly utilized; compared with the traditional topology adopting an energy feedback branch, the embodiment of the invention uses the thyristor bridge circuit to replace the energy feedback inductor to recycle energy, shortens the energy recycling time, can be applied to a pulse magnet with large inductance, and improves the energy utilization rate and the repetition frequency.
2. The full-bridge topology of the IGBT is adopted, the full-bridge topology is limited by withstand voltage and current resistance of the IGBT, multiple modules are required to be connected in series and parallel in a large-voltage and large-current occasion, the reliability of the circuit is low, the problems of voltage sharing, current sharing and synchronous conduction are considered, and the embodiment of the invention uses a thyristor bridge circuit, has a simple and reliable structure, is high in withstand voltage and current resistance level, can be applied to a large-voltage and large-current occasion, and is lower in cost.
Drawings
FIG. 1 is a diagram of a repetitive pulse system with energy feed branches;
FIG. 2 is a schematic diagram of a unipolar repetitive pulse magnetic field system according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a unipolar repeating pulse magnetic field system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a charging system and a charging polarity conversion circuit of a unipolar repetitive pulse magnetic field system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a discharge circuit of a unipolar repetitive pulse magnetic field system according to an embodiment of the present invention;
fig. 6 is a waveform diagram of the generation of a unipolar repeating pulse magnetic field system provided by an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The description of the contents of the above embodiment will be given below in connection with a preferred embodiment.
In the prior art, as shown in the equivalent circuit diagram of the repetitive pulse system shown in fig. 1, the process of generating the repetitive pulse can be described as: the charging system firstly passes through the energy feedback inductance L 1 To capacitor bank C 1 Charging to preset voltage, and triggering the thyristor switch T 1 The capacitor is discharged to the pulse magnet to generate a pulse strong magnetic field. With magnet current I 1 Begins to decay, a small portion of the magnet current is directed to capacitance C 1 The reverse charge forms a certain back voltage to force the diode D 1 The electric conduction is carried out,most of the magnet current I 2 The capacitor will be charged through the energy feed inductance, achieving energy recovery and reversing the polarity of the voltage on the capacitor. However, in this circuit topology, the values of the magnet inductance and the energy feedback inductance should be comparable in order to effectively achieve energy feedback. If the feed inductance value is set too large, this will result in an increase in the loss of energy on the feed inductance coil, thereby reducing the energy utilization. If the energy feedback inductance value is too small, the energy feedback function cannot be realized. Therefore, in order to avoid excessive energy loss on the energy feedback inductor, the energy feedback inductance value should be kept within a moderate range, which also limits the magnet inductance value, and the scheme is mainly applicable to small-inductance pulse magnets to generate a short-pulse magnetic field.
In order to solve the problems in the prior art, as shown in fig. 2 and 3, an embodiment of the present invention provides a unipolar repetitive pulse magnetic field system, including: the primary energy supply circuit, the charging system, the charging polarity conversion circuit, the discharging circuit and the magnet are sequentially connected;
the primary energy supply circuit is used for providing electric energy;
the charging system comprises an LC resonance circuit and is used for carrying out constant-current charging on a subsequent circuit;
the charging polarity conversion circuit is a thyristor bridge circuit and passes through a capacitor C O The charge polarity conversion circuit is connected with the discharge circuit and is used for converting the charge polarity according to the capacitor C O Selectively triggering a positive polarity thyristor switch or a negative polarity thyristor switch, converting the charging polarity of the thyristor bridge circuit, and connecting a capacitor C O Charged to the preset positive voltage U m Or negative polarity voltage preset value-U m ；
The discharging circuit is a thyristor bridge circuit and is used for controlling the capacitor C O Selectively triggering the thyristor switch to realize the capacitance C O Discharging the magnet positively, or, capacitance C O The magnet is negatively discharged to generate a single-polarity repeated pulse magnetic field.
The primary energy supply circuit is a storage battery or a rectifying and filtering power supply.
The input end of the charging system is connected with the output end of the primary energy supply circuit, the output end of the charging system is connected with the input end of the charging polarity conversion circuit, the charging system is used for providing a constant current charging function, the output end of the charging polarity conversion circuit is connected with the input end of the discharging circuit, and the charging polarity conversion circuit is used for charging the capacitor to a set value according to the polarity of the capacitor to charge the capacitor C O Charged to the preset positive voltage U m Or negative polarity voltage preset value-U m The method comprises the steps of carrying out a first treatment on the surface of the The output end of the discharging circuit is connected to the magnet, and the discharging circuit is used for providing forward current for the magnet according to the polarity of the capacitor to generate a unipolar repeated pulse magnetic field.
As shown in fig. 4, the charging system is composed of a primary energy device and an LC resonance circuit, wherein the primary energy device can use a storage battery or a rectifying and filtering power supply to supply power to the charging system, and the LC resonance circuit controls four insulated gate bipolar transistors Q 1 ～Q 4 And the first switch matrix is formed, so that the constant current charging function is realized.
Specifically, the charging system comprises four insulated gate bipolar transistors, four diodes and an LC oscillating circuit; four insulated gate bipolar transistors form a first switch matrix, and four diodes form a second switch matrix; the LC oscillating circuit is connected with the first switch matrix and is connected with the second switch matrix through a transformer;
in the first switch matrix, a first insulated gate bipolar transistor Q 1 Collector of (d) and fourth insulated gate bipolar transistor Q 4 Is connected with the collector of the first insulated gate bipolar transistor Q 1 Emitter of (c) and second insulated gate bipolar transistor Q 2 Collector connection of second insulated gate bipolar transistor Q 2 Emitter and third insulated gate bipolar transistor Q 3 Emitter connection of a fourth insulated gate bipolar transistor Q 4 Emitter and third insulated gate bipolar transistor Q 3 Is connected with the collector electrode;
one end of the LC oscillating circuit is connected with the first insulated gate bipolar transistor Q 1 Is connected with the emitter of the fourthInsulated gate bipolar transistor Q 4 Emitter connection of (a);
in the second switching matrix, a first diode D 1 Positive electrode of (D) and second diode D 2 Cathode of first diode D 1 Cathode of (D) and fourth diode D 4 Is connected with the negative pole of the second diode D 2 Positive electrode of (D) and third diode D 3 A fourth diode D 4 Positive electrode of (D) and third diode D 3 Is connected with the negative electrode of the battery;
the primary side of the transformer is connected with the LC oscillating circuit, and one end of the secondary side of the transformer is connected with a first diode D 1 Is connected with the positive electrode of the fourth diode D 4 Is connected to the negative electrode of the battery.
Optionally, the positive polarity thyristor switch in the charging polarity conversion circuit includes a first thyristor T 1 And a third thyristor T 3 The negative polarity thyristor switch comprises a second thyristor T 2 And a fourth thyristor T 4 The method comprises the steps of carrying out a first treatment on the surface of the First thyristor T 1 Cathode of (c) and second thyristor T 2 Is connected with the anode of the first thyristor T 1 Anode and fourth thyristor T 4 Anode connection of the second thyristor T 2 Cathode and third thyristor T 3 Cathode connection of fourth thyristor T 4 Cathode and third thyristor T 3 Is connected with the anode of the battery;
capacitor C O Is connected with one end of a first thyristor T 1 The other end is connected with a fourth thyristor T 4 Is connected with the cathode of the battery;
the charging polarity conversion circuit is a capacitor C O Positive polarity charging process: a first thyristor T triggering the charge polarity conversion circuit 1 And a third thyristor T 3 The charging system charges the capacitor C O Charged to a positive voltage preset value U m ；
The charging polarity conversion circuit is a capacitor C O Negative polarity charging process: a third thyristor T triggering the charge polarity switching circuit 2 And a fourth thyristor T 4 The charging system charges the capacitor C O Charged to the negative electrodeSex voltage preset value-U m 。
Optionally, the discharging circuit comprises a thyristor bridge circuit formed by four thyristors, and a fifth thyristor T 5 Cathode and sixth thyristor T 6 Cathode connection of fifth thyristor T 5 Anode and eighth thyristor T 8 Cathode connection of a sixth thyristor T 6 Anode and seventh thyristor T 7 Cathode connection of eighth thyristor T 8 Anode and seventh thyristor T 7 Is connected with the anode of the battery;
capacitor C O One end of the fifth thyristor T 5 The other end is connected with a sixth thyristor T 6 Is connected with the anode of the battery; one end of the magnet is connected with a fifth thyristor T 5 The other end is connected with an eighth thyristor T 8 Is connected with the anode of the battery;
capacitor C O And performing a positive polarity discharge process through the discharge circuit: a fifth thyristor T triggering the discharge circuit 5 And a seventh thyristor T 7 Make the capacitor C O Discharging the magnet to generate a pulse strong magnetic field;
capacitor C O And carrying out a negative polarity discharging process through the discharging circuit: a sixth thyristor T triggering the discharge circuit 6 And an eighth thyristor T 8 Make the capacitor C O The magnet is discharged to generate a pulsed strong magnetic field.
Optionally, during positive polarity discharge, a current I follows the magnet L Attenuation of the current I of the magnet L Counter capacitor C O Reverse charging to form back pressure-U C0 Subsequently, the charging system and the charging polarity switching circuit pair capacitor C O Charging until reaching negative polarity voltage preset value-U m ；
During discharge of negative polarity, current I follows the magnet L Attenuation of the current I of the magnet L Counter capacitor C O Reverse charging to form back pressure U C0 The charging system and the charging polarity conversion circuit pair capacitor C O Charging until reaching the preset positive voltage U m 。
The operation of the unipolar repetitive pulse magnetic field system described above will be described with reference to fig. 4, 5 and 6:
(1) Positive polarity charging process of the discharge capacitor:
thyristor switch T through triggering charging polarity conversion circuit 1 、T 3 The capacitor C is supplemented by combining the constant current charging function provided by the charging system O Energy lost during discharge, from U C0 Charging to a preset voltage U Cm 。
(2) Positive polarity discharge process of the discharge capacitor:
after positive polarity charging is completed, the capacitor voltage is U Cm By triggering the thyristor switch T of the discharge circuit 5 、T 7 Make the capacitor C O The magnet is discharged, generating a single pulse of intense magnetic field. At magnet current I L After reaching the peak value, the magnet begins to decay, and the magnet current directly corresponds to C O Reverse charging until the magnet current I L Attenuation is 0, thyristor switch T 5 、T 7 Cut-off, the reverse charging is finished, the capacitance voltage is-U C0 。
(3) And the negative polarity charging process of the discharge capacitor:
after the positive polarity discharge process is completed, capacitor voltage-U C0 Thyristor switch T through triggering charging polarity conversion circuit 2 、T 4 The capacitor C is supplemented by combining the constant current charging function provided by the charging system O Energy lost during discharge, from-U C0 Charging to a preset voltage-U Cm 。
(4) The negative polarity discharging process of the discharging capacitor:
after the negative polarity charge is completed, the capacitor voltage is-U Cm By triggering the thyristor switch T of the discharge circuit 6 、T 8 Make the capacitor C O The magnet is discharged, generating a single pulse of intense magnetic field. At magnet current I L After reaching the peak value, the magnet begins to decay, and the magnet current directly corresponds to C O Reverse charging until the magnet current I L Attenuation is 0, thyristor switch T 6 、T 8 Cut-off, the reverse charging is finished at the moment, and the capacitance voltage is U C0 。
Since the directions of the magnet currents in the positive polarity discharge process and the negative polarity discharge process are the same, the generated pulse magnetic field is unipolar, and the processes (1) to (4) are repeated, a unipolar repeated pulse strong magnetic field can be generated, as shown in fig. 6.
Optionally, the capacitor C O The positive polarity discharge and the negative polarity discharge are alternately performed at uniform intervals, and the magnets generate uniformly spaced magnet currents of a single polarity and generate repeated pulse magnetic fields of the single polarity.
The above steps are repeated in sequence: discharge capacitor C O Positive polarity charge and discharge capacitor C O Positive polarity discharge process, discharge capacitor C O Negative polarity charge process and discharge capacitor C O The negative polarity discharge process can produce uniformly spaced unipolar magnet currents, i.e., produce a unipolar repeating pulsed high magnetic field, as shown in fig. 6.
The embodiment of the invention provides a unipolar repeated pulse magnetic field system, a charging polarity conversion circuit and a discharging circuit adopt a thyristor full-bridge circuit, and the system is characterized in that the system is based on a capacitor C O Selectively triggering the thyristor switch to realize the capacitance C O Charged with positive/negative polarity of (C) and pass through capacitor C O The magnetic body is subjected to unipolar repeated discharge to generate unipolar repeated pulse magnetic fields, so that the energy recycling is realized. The full-bridge type IGBT power supply circuit solves the problems that in the prior art, the full-bridge type IGBT power supply circuit is limited by the energy feedback inductance value, is only suitable for small-inductance pulse magnets, is limited by the withstand voltage and the current resistance of the IGBT, and needs multiple modules to be connected in series and parallel in a large-voltage and large-current occasion, the circuit reliability is low, and the voltage-sharing current-sharing and synchronous conduction are needed to be considered.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. A unipolar repeating pulsed magnetic field system, comprising: the primary energy supply circuit, the charging system, the charging polarity conversion circuit, the discharging circuit and the magnet are sequentially connected;
the primary energy supply circuit is used for providing electric energy;
the charging system comprises an LC resonance circuit and is used for carrying out constant-current charging on a subsequent circuit;
the charging polarity conversion circuit is a thyristor bridge circuit and passes through a capacitor C O The charge polarity conversion circuit is connected with the discharge circuit and is used for converting the charge polarity according to the capacitor C O Selectively triggering a positive polarity thyristor switch or a negative polarity thyristor switch, converting the charging polarity of the thyristor bridge circuit, and connecting a capacitor C O Charged to the preset positive voltage U m Or negative polarity voltage preset value-U m ；
The discharging circuit is a thyristor bridge circuit and is used for controlling the capacitor C O Selectively triggering the thyristor switch to realize the capacitance C O Discharging the magnet positively, or, capacitance C O The magnet is negatively discharged to generate a single-polarity repeated pulse magnetic field.
2. The unipolar repeating pulsed magnetic field system of claim 1, wherein the positive polarity thyristor switch in the charge polarity switching circuit comprises a first thyristor T 1 And a third thyristor T 3 The negative polarity thyristor switch comprises a second thyristor T 2 And a fourth thyristor T 4 The method comprises the steps of carrying out a first treatment on the surface of the First thyristor T 1 Cathode of (c) and second thyristor T 2 Is connected with the anode of the first thyristor T 1 Anode and fourth thyristor T 4 Anode connection of the second thyristor T 2 Cathode and third thyristor T 3 Cathode connection of fourth thyristor T 4 Cathode and third thyristor T 3 Is connected with the anode of the battery;
capacitor C O Is connected with the first end ofThyristor T 1 The other end is connected with a fourth thyristor T 4 Is connected with the cathode of the battery;
the charging polarity conversion circuit is a capacitor C O Positive polarity charging process: a first thyristor T triggering the charge polarity conversion circuit 1 And a third thyristor T 3 The charging system charges the capacitor C O Charged to a positive voltage preset value U m ；
The charging polarity conversion circuit is a capacitor C O Negative polarity charging process: a third thyristor T triggering the charge polarity switching circuit 2 And a fourth thyristor T 4 The charging system charges the capacitor C O Charging to negative polarity voltage preset value-U m 。
3. The unipolar repetitive pulse magnetic field system of claim 1, wherein the discharge circuit includes a thyristor bridge circuit of four thyristors, a fifth thyristor T 5 Cathode and sixth thyristor T 6 Cathode connection of fifth thyristor T 5 Anode and eighth thyristor T 8 Cathode connection of a sixth thyristor T 6 Anode and seventh thyristor T 7 Cathode connection of eighth thyristor T 8 Anode and seventh thyristor T 7 Is connected with the anode of the battery;
capacitor C O One end of the fifth thyristor T 5 The other end is connected with a sixth thyristor T 6 Is connected with the anode of the battery; one end of the magnet is connected with a fifth thyristor T 5 The other end is connected with an eighth thyristor T 8 Is connected with the anode of the battery;
capacitor C O And performing a positive polarity discharge process through the discharge circuit: a fifth thyristor T triggering the discharge circuit 5 And a seventh thyristor T 7 Make the capacitor C O Discharging the magnet to generate a pulse strong magnetic field;
capacitor C O And carrying out a negative polarity discharging process through the discharging circuit: a sixth thyristor T triggering the discharge circuit 6 And an eighth thyristor T 8 Make the capacitor C O The magnet is discharged to generate a pulsed strong magnetic field.
4. The unipolar repeating pulsed magnetic field system of claim 3, wherein during positive polarity discharge, current I follows the magnet L Attenuation of the current I of the magnet L Counter capacitor C O Reverse charging to form back pressure-U C0 The charging system and the charging polarity conversion circuit pair capacitor C O Charging until reaching negative polarity voltage preset value-U m ；
During discharge of negative polarity, current I follows the magnet L Attenuation of the current I of the magnet L Counter capacitor C O Reverse charging to form back pressure U C0 The charging system and the charging polarity conversion circuit pair capacitor C O Charging until reaching the preset positive voltage U m 。
5. The unipolar repetitive pulse magnetic field system of claim 3, wherein the capacitance C O The positive polarity discharge and the negative polarity discharge are alternately performed at uniform intervals, and the magnets generate uniformly spaced magnet currents of a single polarity and generate repeated pulse magnetic fields of the single polarity.
6. The unipolar repetitive pulse magnetic field system of claim 1, wherein the charging system includes four insulated gate bipolar transistors, four diodes, and an LC tank circuit; four insulated gate bipolar transistors form a first switch matrix, and four diodes form a second switch matrix; the LC oscillating circuit is connected with the first switch matrix and is connected with the second switch matrix through a transformer;
in the first switch matrix, a first insulated gate bipolar transistor Q 1 Collector of (d) and fourth insulated gate bipolar transistor Q 4 Is connected with the collector of the first insulated gate bipolar transistor Q 1 Emitter of (c) and second insulated gate bipolar transistor Q 2 Collector connection of second insulated gate bipolar transistor Q 2 Emitter and third insulator of (2)Edge gate bipolar transistor Q 3 Emitter connection of a fourth insulated gate bipolar transistor Q 4 Emitter and third insulated gate bipolar transistor Q 3 Is connected with the collector electrode;
one end of the LC oscillating circuit is connected with the first insulated gate bipolar transistor Q 1 The other end is connected with the fourth insulated gate bipolar transistor Q 4 Emitter connection of (a);
in the second switching matrix, a first diode D 1 Positive electrode of (D) and second diode D 2 Cathode of first diode D 1 Cathode of (D) and fourth diode D 4 Is connected with the negative pole of the second diode D 2 Positive electrode of (D) and third diode D 3 A fourth diode D 4 Positive electrode of (D) and third diode D 3 Is connected with the negative electrode of the battery;
the primary side of the transformer is connected with the LC oscillating circuit, and one end of the secondary side of the transformer is connected with a first diode D 1 Is connected with the positive electrode of the third diode D 3 Is connected to the negative electrode of the battery.
7. The unipolar repeating pulsed magnetic field system of claim 1, wherein the primary energy supply circuit is a battery or a rectified and filtered power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311845309.6A CN117713758A (en) | 2023-12-28 | 2023-12-28 | Unipolar repetitive pulse magnetic field system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311845309.6A CN117713758A (en) | 2023-12-28 | 2023-12-28 | Unipolar repetitive pulse magnetic field system |
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| CN202311845309.6A Pending CN117713758A (en) | 2023-12-28 | 2023-12-28 | Unipolar repetitive pulse magnetic field system |
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