CN116614018A - Heavy frequency flat-top pulse magnetic field generating device - Google Patents
Heavy frequency flat-top pulse magnetic field generating device Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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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 heavy frequency flat-top pulse magnetic field generating device, which comprises: main circuit comprising full bridge unit and parallel connectionnA phase half-bridge unit, wherein two bridge arms in the full-bridge circuit pass throughmThe series branch of the strip energy storage capacitor and the converter switch are connected,mthe series branches are connected in parallel to form an energy storage capacitor bank; the detection circuit is used for collecting the terminal voltage of the energy storage capacitor, the current of the magnet and the current of each filter inductor in each series branch and feeding the terminal voltage, the current of the magnet and the current of each filter inductor back to the control circuit; control circuit for setting target magnetic field waveform parameter, magnet fault threshold, operation mode and operation modeCompleting the generation of the target reference waveform and the judgment of the operation mode, and 2nPWM control signal of +4 way DC control switchmThe control signal of the circuit converting switch is configured in a corresponding mode, and closed-loop adjustment is performed according to the acquisition value of the detection circuit. The invention can generate fast rising high-frequency, high-stability, heavy-frequency flat-top pulse strong magnetic field.
Description
Technical Field
The invention belongs to the technical field of pulse power, and particularly relates to a heavy frequency flat-top pulse magnetic field generating device.
Background
In the current pulsed high magnetic field research, the main development directions include: higher magnetic field intensity, longer magnetic field pulse width time, higher magnetic field repetition frequency, lower flat-top magnetic field ripple coefficient and the like.
Most of the current pulsed high-intensity magnetic field experiment systems are single experiment systems and end with a single peak or a single flat top. The heavy frequency flat-top pulse magnetic field is a system for continuously and repeatedly providing a controllable waveform strong magnetic field, so that the system has wider application prospect and adaptability in industrial application, comprises a plurality of scientific research fields such as air dust removal, sewage treatment, terahertz sources, neutron diffraction, magnetic refrigeration and the like and industrial production fields, and can greatly improve the test efficiency.
In order to generate a high-intensity magnetic field, the power supply is generally a high-voltage capacitor group power supply, a storage battery power supply, a pulse generator and a power grid type power supply. The high-voltage capacitor group has the advantages that the output power is not limited, the advantage of high voltage can be utilized to enable the current of the magnet to rise rapidly, but the output voltage of the high-voltage capacitor group is uncontrollable, and the output voltage drops rapidly in the discharging process, so that the flat top is difficult to keep in the discharging process; the storage battery power supply has the advantages of high energy storage and no ripple wave, but the storage battery has low output power and long magnetic field rising time. The pulse generator-rectifier type power supply contains low-frequency ripple waves, is high in price and large in volume, and is not beneficial to miniaturization development; the power grid type power supply has no intermediate energy storage link, so that the required high instantaneous power can generate great impact on the power grid and even influence the stability of the power grid, thereby limiting the application of the power grid type power supply in a high-strength magnetic field.
Therefore, how to combine the advantages of various types of power supplies to generate a fast-rising high-frequency high-stability heavy-frequency flat-top pulse strong magnetic field is one of the key points of the current research.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a heavy frequency flat-top pulse magnetic field generating device which can generate a fast-rising high-frequency high-stability heavy frequency flat-top pulse strong magnetic field.
To achieve the above object, in a first aspect, the present invention provides a device for generating a repeated frequency flat-top pulsed magnetic field, comprising:
main circuit comprising full bridge unit and parallel connectionnThe input end of each phase of half-bridge unit is connected with the positive pole and the negative pole of the low-voltage direct-current power supply, the midpoint of a bridge arm of each phase of half-bridge unit is connected with the midpoint of one bridge arm of the full-bridge unit through a filter inductor, the midpoint of the other bridge arm of the full-bridge unit is connected with one end of a magnet, and the other end of the magnet is connected with the negative pole of the low-voltage direct-current power supply; and two bridge arms in the full-bridge circuit pass throughmThe series branch of the strip energy storage capacitor and the converter switch are connected,mthe series branches are connected in parallel to form an energy storage capacitor bank;
the detection circuit is used for collecting the terminal voltage of the energy storage capacitor, the current of the magnet and the current of each filter inductor in each series branch and feeding the terminal voltage, the current of the magnet and the current of each filter inductor back to the control circuit;
the control circuit is used for completing the generation of a target reference waveform and the judgment of the running mode according to the set target magnetic field waveform parameter, the magnet fault threshold, the running mode and the running mode, and performing closed-loop adjustment according to the acquisition value of the detection circuit; if the operation mode is a manual operation mode, configuring 2 in the main circuit according to the operation modenPWM control signal of +4 way DC control switchmThe control signal of the circuit converter switch automatically switches the operation mode through the timer and the acquisition value of the detection circuit if the operation mode is an automatic operation mode;
wherein, two direct current control switches in each phase half-bridge unit and two bridge arms of the full-bridge unitPWM control signals of the DC control switches are complementary, and the phase angles of the PWM control signals of the DC control switches in each phase half-bridge circuit are respectively 0 ° 、360 ° /n、…、360 ° (n-1)/nThe method comprises the steps of carrying out a first treatment on the surface of the The operation mode comprises a capacitor charging mode and a magnet discharging mode, wherein the capacitor charging mode is divided into a magnet charging stage, a capacitor charging stage and a magnet energy discharging stage, and the magnet repetition frequency mode is divided into a magnet current rising stage, a magnet current flat-top stage and a magnet current falling stage.
The invention provides a heavy frequency flat-top pulse magnetic field generating device, which adoptsnThe structures of the phase half-bridge unit and the full-bridge unit realize voltage rising and falling by using a low-voltage direct current power supply, realize controllable high voltage by using an energy storage capacitor bank, effectively reduce the volume of the power supply, realize compact miniaturization of the device and flexible and controllable output of magnetic field waveforms, thereby generating a multi-parameter adjustable, steep rising edge and high-stability heavy frequency flat-top pulse magnetic field, improving the flexibility of the pulse magnetic field and providing experimental conditions of multi-dimensional heavy frequency flat-top pulse magnetic field waveforms.
In one embodiment, one of the bridge arms of the full bridge circuit comprises a series connection of upper bridge arm DC control switchesS 5 And lower bridge arm direct current control switchS 6 The other bridge arm of the full-bridge circuit comprises a series connection upper bridge arm direct current control switchS 7 And lower bridge arm direct current control switchS 8 ；nThe upper bridge arm direct current control switches in the phase half bridge units are respectivelyS 1A 、S 2A 、…、S nA ，nThe lower bridge arm direct current control switches in the phase half bridge units are respectivelyS 1B 、S 2B 、…、S nB And (3) withnThe filter inductances correspondingly connected with the bridge arm midpoints of the phase half-bridge units are respectivelyL 1 、L 2 、…、L n ；
Wherein, during a magnet charging phase in the capacitor charging mode, the control circuit controlsnDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA And in a full-bridge unitDC control switchS 5 、S 7 Conducting to enable the low-voltage direct-current power supply to supply energy to each filter inductor and the magnet, and pumping and storing energy for the voltage of the energy storage capacitor bank;
during a capacitor charging phase in a capacitor charging mode, a control circuit controlsnDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA And a DC control switch in a full bridge unitS 5 、S 8 Conducting to make low-voltage DC power supply and filter inductanceL 1 、L 2 、…、L n And the energy stored by the magnet inductor charges the energy storage capacitor bank together to realize the voltage rising of the energy storage capacitor bank, and the energy is stored for the rapid rising of the current in the magnet repetition frequency mode;
during the magnet discharging phase in the capacitor charging mode, the control circuit controlsnDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA Direct current control switch in turn-off and full-bridge unitS 5 、S 8 On, when the DC control switch in the full bridge unitS 6 、S 7 When the internal freewheeling diode of (1) receives back voltage and is cut off, the low-voltage direct-current power supply stops supplying power to the filter inductorL 1 、L 2 、…、L n And the remaining energy stored by the magnet inductance is fully charged to the storage capacitor bank.
In one of the embodiments of the present invention,mthe energy storage capacitors in the serial branches are respectivelyC 1 、C 2 、…、C m ，mThe converter switches in the serial branches are respectivelyS c1 、S c2 、…、S cm ；
The energy storage capacitor bank adopts a sequential charging mode, and the sequential charging mode is as follows: first, a converter switch is turned onS c1 Switch-off converter switchS c2 、S c3 、…、S cm The low-voltage direct-current power supply is led to the energy storage capacitorC 1 Charging methodThe energy storage capacitor is detected by the detection circuitC 1 After the voltage reaches the threshold value, the converter switch is turned offS c1 Conduction converter switchS c2 The above process is repeated to make the detection circuit detect the energy storage capacitorC 2 And the voltage is analogized to finish the charging of the energy storage capacitor bank.
In one embodiment, the control circuit controls the commutation switch during a magnet current ramp-up phase in the magnet repetition frequency modeS c1 、S c2 、…、S cm The electric conduction is carried out,nDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA DC control switch in conducting and full bridge unitS 6 、S 7 DC control switch in conducting and full bridge unitS 5 、S 8 The internal freewheeling diode of the energy storage capacitor bank is subjected to back pressure cutoff, the energy storage capacitor bank and the low-voltage direct current power supply are in equivalent series discharge and cooperatively supply power to the magnet, and the optimal transient characteristic of the hysteresis controller is utilized to enable the current of the magnet to rise rapidly by utilizing the high-voltage high-power output of the energy storage capacitor bank;
the control circuit maintains the commutation switch during a magnet current plateau phase in a magnet repetition frequency modeS c1 、S c2 、…、S cm DC control switch in conducting and full bridge unitS 6 、S 8 DC control switch in conducting and full bridge unitS 5 、S 7 The internal freewheeling diode of (1) is subjected to back-pressure cutoff, and only the low-voltage direct current power supply supplies power to the magnet to induce current in each phasei p1 、i p2 、…、i pn PI controller with strong tracking ability is used for state feedback quantity by changingnDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA Duty cycle of PWM control signal versus magnet currenti m Negative feedback control is performed to maintain the average voltage of the magnet asR m i m ，R m Is the resistance value of the magnet resistor, singlyThe bit is omega;
the control circuit maintains the commutation switch during a magnet current ramp down phase in a magnet repetition frequency modeS c1 、S c2 、…、S cm The electric conduction is carried out,nDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA DC control switch in turn-off full bridge unitS 5 、S 8 DC control switch in conducting and full bridge unitS 6 、S 7 The internal freewheeling diode of the capacitor is subjected to back pressure and cut off, and the magnet energy is fed back to the energy storage capacitor bank for charging, so that the energy is quickly recovered.
In one embodiment, the inductance values of the filter inductors are equal to each otherL p The capacitance values of all the energy storage capacitors in the energy storage capacitor bank are equal, and the unit is H.
In one embodiment, the magnet current is at the magnet current rise phasei m The expression of (2) is:
（1）
in the method, in the process of the invention,u c the voltage of the energy storage capacitor bank is expressed as V;Cthe capacity value of the energy storage capacitor bank is F; damping factorThe method comprises the steps of carrying out a first treatment on the surface of the Equivalent inductance->，L m The inductance value of the magnet inductance is H; equivalent internal resistance，R p The internal resistance of each filter inductor is shown as omega; resonant angular frequency of device in heavy frequency operation modeDamping oscillation angular frequency of device in heavy frequency operation mode +.>；t m For magnet currenti m The unit of rise time is s; phase angle of the device in the repetition frequency mode of operation +.>；U s The voltage of the low-voltage direct-current power supply is expressed as V;
capacity value of energy storage capacitor groupCThe expression of (2) is:
（2）
according to the formulas (1) and (2), the current rise time of the magnet and the required target magnet currenti m The unit is A, and the capacitance value of each energy storage capacitor in the energy storage capacitor bank is determinedC P The unit is F.
In one embodiment, the control circuit includes a PC and a controller, where the PC is configured to set a target waveform parameter and a magnet fault threshold, set a control instruction of an operation mode and an operation mode, and send the control instruction to the controller; the controller is used for completing the generation of a target reference waveform and the judgment of an operation mode according to a control instruction issued by the PC, and performing closed-loop adjustment according to the acquisition value of the detection circuit; if the manual operation mode is judged, configuring 2 according to the operation mode instructionnPWM control signal of +4 way DC control switchmA control signal of the circuit-switching switch; if the automatic operation mode is judged, the operation mode is automatically switched through the timer and the acquisition value of the detection circuit.
In one embodiment, the target magnetic field waveform parameters include magnetic field rise time, amplitude, frequency, duty cycle, magnet cooling time, and total duration, and the magnet fault threshold includes a magnet over-voltage point and an over-current point.
In one embodiment, the detection circuit includes a voltage sensor VT for sensing the voltage in each series branch and a current sensor CTThe current sensor CT is used for collecting the current of the magnet and the filter inductanceL 1 、L 2 、…、L n Is set in the above-described range).
In a second aspect, the invention provides an application of the heavy frequency flat-top pulse magnetic field generating device, and the heavy frequency flat-top pulse magnetic field generating device is used in the fields of terahertz sources and neutron diffraction.
Drawings
FIG. 1 is a schematic diagram of a heavy frequency flat-top pulse magnetic field generating device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a device for generating a dual-frequency flat-top pulsed magnetic field according to an embodiment of the present invention;
FIG. 3 is a waveform diagram of capacitor charge mode magnet current versus storage capacitor bank voltage according to an embodiment of the present invention;
fig. 4 is a waveform diagram of a magnet current versus a voltage of a storage capacitor bank for a magnet in a frequency-multiplexed mode according to 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 order to generate a fast-rising high-frequency high-stability heavy-frequency flat-top pulse strong magnetic field, the invention provides a heavy-frequency flat-top pulse magnetic field generating device which is used for scientific experiments such as terahertz sources, neutron diffraction and the like to provide more comprehensive magnetic field conditions, and the heavy-frequency flat-top pulse magnetic field generating device comprises a main circuit, a detection circuit and a control circuit as shown in figure 1.
Wherein the main circuit comprises a full-bridge unit and a parallel connectionnThe input end of each phase half-bridge unit is connected with the positive pole and the negative pole of the low-voltage direct-current power supply, the midpoint of the bridge arm of each phase half-bridge unit is connected with the midpoint of one bridge arm of the full-bridge unit through a filter inductor, and the midpoint of the other bridge arm of the full-bridge unit is connected with one end of the magnetThe other end of the magnet is connected with the negative electrode of the low-voltage direct-current power supply; and two bridge arms in the full-bridge circuit pass throughmThe series branch of the strip energy storage capacitor and the converter switch are connected,mthe series branches are connected in parallel to form a storage capacitor group.
It should be noted that, the full-bridge unit provided in this embodiment is a full-bridge structure commonly used in the art, and includes two parallel bridge arms, i.e., a left bridge arm and a right bridge arm, each of which includes an upper dc control switch and a lower dc control switch connected in series, i.e., the left bridge arm includes an upper dc control switch connected in seriesS 5 And a lower DC control switchS 6 The right bridge arm comprises an upper direct current control switch connected in seriesS 7 And a lower DC control switchS 8 . The half-bridge unit of each phase provided in this embodiment is a half-bridge structure commonly used in the art, and includes an upper bridge arm and a lower bridge arm connected in series, where each bridge arm adopts a direct current control switch, as shown in fig. 1, for the first phasejPhase half bridge unitj=1,2,…,n) The upper bridge arm adopts a direct current control switchS jA The lower bridge arm adopts a direct current control switchS jB . Preferably, the dc control switch provided in this embodiment is composed of a switching tube and a diode antiparallel to the switching tube.
In the main circuit provided in this embodiment, the connection relationship of each component is:
positive pole of low-voltage DC power supply and DC control switchS 1A 、S 2A 、…、S nA The negative pole of the low-voltage DC power supply is respectively connected with the DC control switchS 1B 、S 2B 、…、S nB Is connected with the emitter of the (C); 2nDirect current control switchS 1A 、S 1B 、S 2A 、S 2B 、…、S nA 、S nB ) Together formnA phase half bridge unit; DC control switchS 1A Emitter, direct current control switch of (c)S 1B Collector and filter inductance of (c)L 1 Is connected to a point (node a); likewise, direct current control switchS 2A Emitter, direct current control switch of (c)S 2B Collector and filter inductance of (c)L 2 Is connected to a point; direct current control switchS nA Emitter, direct current control switch of (c)S nB Collector and filter inductance of (c)L n Is connected to a point; filtering inductanceL 1 、L 2 、…、L n And the other end of (c) is connected to a point.
In full bridge units, dc-controlled switchesS 5 Emitter, direct current control switch of (c)S 6 Collector and filter inductance of (c)L 1 、L 2 、…、L n Is connected to one end of the switchS 7 Emitter, direct current control switch of (c)S 8 Is connected to a point at one end of the collector and magnet; the two bridge arms of the full-bridge unit are connected by a storage capacitor bank, and the storage capacitor bank consists ofmEach series branch comprises an energy storage capacitor and a converter switch which are connected in series. In the storage capacitor bank, the storage capacitorC 1 One end of (2) a converter switchS c1 Is connected with the collector electrode of the same energy storage capacitorC 2 One end of (2) and a converter switchS c2 Is connected to the energy storage capacitorC m One end of (2) and a converter switchS cm Is connected with the collector electrode; energy storage capacitorC 1 、C 2 、…、C m Another end of (a) DC control switchS 5 Collector, dc control switch of (c)S 7 Is connected to a point (node b); converter switchS c1 、S c2 、…、S cm Emitter and DC control switch of (C)S 6 Emitter, direct current control switch of (c)S 8 Is connected to a point (node c).
The detection circuit provided by the embodiment is used for collecting the terminal voltage of the energy storage capacitor, the current of the magnet and the current of each filter inductor in each series branch and feeding the terminal voltage, the current of the magnet and the current of each filter inductor back to the control circuit.
Specifically, the detection circuit provided in the present embodiment may employ a voltage sensor VT and a current sensor CT. Wherein, the current sensor CT is used for collecting the filter inductanceL 1 、L 2 、…、L n Is (1) the current of the (a)i p1 、i p2 、…、i pn Magnet output currenti m The unit is A, and the voltage sensor VT is used for collecting the energy storage capacitorC 1 、C 2 、…、C m Terminal voltage of (2)u c1 、u c2 、…、u cm The unit is V, and the acquired analog signals are conditioned and then transmitted to a control circuit.
The control circuit provided by the embodiment is used for completing the generation of the target reference waveform and the judgment of the running mode according to the set target magnetic field waveform parameter, the set magnet fault threshold, the set running mode and the set running mode, and performing closed-loop adjustment according to the acquisition value of the detection circuit; if the operation mode is a manual operation mode, configuring 2 in the main circuit according to the operation modenPWM control signal of +4 way DC control switchmAnd if the operation mode is an automatic operation mode, the control signal of the circuit current-converting switch automatically switches the operation mode through the timer and the acquisition value of the detection circuit.
Wherein 2 isnThe PWM control signal is used for corresponding controlnDC control switch in phase half-bridge unitS 1A 、S 1B 、S 2A 、S 2B 、…、S nA 、S nB 4-way PWM control signal is used for correspondingly controlling the direct current control switch in the full-bridge unitS 5 、S 6 、S 7 、S 8 Is arranged on the upper surface of the substrate,mthe circuit commutation signal is used for correspondingly controlling the commutation switch in the energy storage capacitor bankS c1 、S c2 、…、S cm Is formed on the substrate.
The working principle and the control method of the heavy frequency flat-top pulse magnetic field generating device provided by the embodiment are as follows:
the main circuit is formed by a full bridgeUnit and method for manufacturing the samenThe phase half-bridge units are formed, a low-voltage direct-current power supply is connected to the input end of each phase half-bridge unit, and a direct-current control switch (the direct-current control switch of the first phase is that of each phase half-bridge unitS 1A 、S 1B The DC control switch of the second phase isS 2A 、S 2B The third phase DC control switch isS 3A 、S 3B To the firstnThe phase being dc-controlledS nA 、S nB ) Adopts complementary control to PWM control signals of the control circuit; second, DC control switchS 1A 、S 2A 、…、S nA The phase angles of PWM control signals of (2) are respectively 0 ° 、360 ° /n、…、360 ° (n-1)/nThe method comprises the steps of carrying out a first treatment on the surface of the Likewise, direct current control switchS 1B 、S 2B 、…、S nB The phase angles of PWM control signals of (2) are respectively 0 ° 、360 ° /n、…、360 ° (n-1)/n. DC control switch in full bridge unitS 5 、S 6 Adopts complementary control to PWM control signals of the control circuit; likewise, direct current control switchS 7 、S 8 Adopts complementary control to the PWM control signal of (c).
The working process of the heavy frequency flat-top pulse magnetic field generating device provided by the embodiment is divided into a capacitor charging mode and a magnet heavy frequency mode. The capacitor charging mode is divided into a magnet charging stage, a capacitor charging stage and a magnet energy discharging stage, and the magnet repetition frequency mode is divided into a magnet current rising stage, a magnet current flat-top stage and a magnet current falling stage, and is controlled in stages by setting a state flag bit.
(1) Magnet charging stage, control circuit controlsnDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA DC control switch in conducting and full bridge unitS 5 、S 7 Conducting to make low voltage DC power supply to filter inductanceL 1 、L 2 、…、L n And the magnet is powered to storeThe capacitor bank voltage pumps up to store energy; in order to realize the current sharing of each phase of half-bridge unit, the element stress is reduced to the greatest extent, and the inductance values of each filter inductor are set to be equal and are allL p The unit is H.
(2) Capacitor charging stage, control circuit controlsnDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA DC control switch in conducting and full bridge unitS 5 、S 8 Conducting to make low-voltage DC power supply and filter inductanceL 1 、L 2 、…、L n And the energy stored by the magnet inductor is charged to the energy storage capacitor bank together, the voltage boost of the energy storage capacitor bank can be realized through the modes (1) and (2), and the energy is stored for the rapid rise charge of the current in the magnet repetition frequency mode.
Further, the voltage of each storage capacitor in the storage capacitor banku ci （i=1, 2 …, m) is:
in the method, in the process of the invention,U s the voltage of the low-voltage direct-current power supply is expressed as V; damping factorThe method comprises the steps of carrying out a first treatment on the surface of the Equivalent inductance，L m The inductance value of the magnet inductance is H; equivalent internal resistance->，R m Is the resistance value of the resistance of the magnet,R p the internal resistance of each filter inductor is shown as omega; first, theiThe resonance angular frequency of the device in the charging mode of operation of the energy storage capacitor>，C i To store energyThe first capacitor in the capacitor bankiThe capacitance of each energy storage capacitor; first, theiThe damping oscillation angular frequency of the device in the charging mode of operation of the energy storage capacitor>The method comprises the steps of carrying out a first treatment on the surface of the First, theiPhase angle of the device in the charging mode of operation of the energy storage capacitor>；t ci Is the firstiThe voltage rising time of the charging of the energy storage capacitors is s;Dis the time duty cycle of phase (1) within one switching cycle. The voltage of each energy storage capacitor can be deduced according to the aboveu ci The minimum time required to rise to maximum.
(3) Magnet energy release stage, control circuit controlnDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA DC control switch in turn-off full bridge unitS 5 、S 8 Conduction, direct current control switchS 6 、S 7 The internal freewheeling diode of (1) receives the back-voltage cut-off, the low-voltage DC power supply stops supplying power, and the filter inductorL 1 、L 2 、…、L n And the remaining energy stored by the magnet inductance is fully charged to the storage capacitor bank.
In order to increase the resonant frequency, so as to achieve a faster charging speed and a higher charging voltage and reduce the heating of the magnet, the embodiment adopts a parallel connection mode of a plurality of energy storage capacitors to charge in turn, and for the design object of the embodiment, the energy storage capacitor bank adoptsmThe energy storage capacitors are connected in parallel and are sequentially connected in pairsC 1 、C 2 、…、C m And (5) charging. Specifically, the sequential charging mode is as follows: first, a converter switch is turned onS c1 Switch-off converter switchS c2 、S c3 、…、S cm The low-voltage direct-current power supply is led to the energy storage capacitorC 1 Charging, detecting the energy storage capacitor at the voltage sensor VTC 1 Voltage arrival atAfter the threshold value, the converter switch is turned offS c1 Conduction converter switchS c2 The above process is repeated, so that the voltage sensor VT detects the energy storage capacitorC 2 And the voltage is analogized to finish the charging of the energy storage capacitor bank.
And after the capacitor charging mode is completed, cooling the magnet, and entering a magnet weight frequency conversion mode.
(4) In the magnet current rising stage, a control circuit controls a converter switchS c1 、S c2 、…、S cm The electric conduction is carried out,nDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA DC control switch in conducting and full bridge unitS 6 、S 7 Conduction, direct current control switchS 5 、S 8 The internal freewheeling diode of the energy storage capacitor bank is subjected to back pressure cutoff, the energy storage capacitor bank and the low-voltage direct current power supply are in equivalent series connection for discharging, the energy storage capacitor bank and the low-voltage direct current power supply are cooperated for supplying power to the magnet, and the optimal transient characteristic of the hysteresis controller is utilized for enabling the current of the magnet to rise rapidly by utilizing the high-voltage high-power output of the energy storage capacitor bank.
In the present embodiment, the magnet current rises in the magnet current rising stagei m The expression of (2) is
In the resonant angular frequency of the device in the repetition frequency operation mode，CFor the capacitance of the storage capacitor bank, the unit is F, the damping oscillation angular frequency of the device in the heavy frequency operation mode is +.>，t m For magnet currenti m In s, phase angle of the device in the repetition frequency mode of operation +.>Other variables can be found in the foregoing.
Capacity value of energy storage capacitor groupCThe expression of (2) is:
according to the above magnet currenti m Capacity value of energy storage capacitor bankCCan be determined by the current rise time requirement of the magnet and the required target magnet currenti m Solving the voltages of the energy storage capacitor groups needed by different target magnetic fieldsu c Capacitance of energy storage capacitor bankC。
Further, according to the capacitance series-parallel formula, the capacitance value of the energy storage capacitor bank can be obtainedCThe relation with the capacitance value of each energy storage capacitor is as follows:
in the formula, in order to minimize the current flowing through the magnet in the charging process and improve the resonant frequency, the capacitance of each energy storage capacitor in the energy storage capacitor bank can be set to be the same, and then the capacitance of each energy storage capacitorC P =C/m。
(5) Magnet current flat-top stage, control circuit keeps the commutation switchS c1 、S c2 、…、S cm DC control switch in conducting and full bridge unitS 6 、S 8 Conduction, direct current control switchS 5 、S 7 The internal freewheeling diode of (1) is subjected to back-voltage cutoff and is powered by the low-voltage DC power supply to filter the inductance currenti p1 、i p2 、…、i pn The PI controller with strong tracking ability is used for the state feedback quantity (obtained by CT detection of a current sensor) by changingnDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA Duty cycle of PWM control signal versus magnet currenti m The negative feedback control is performed so that the negative feedback control is performed,maintaining the average voltage of the magnet atR m i m 。
(6) In the magnet current falling stage, the control circuit keeps the converter switchS c1 、S c2 、…、S cm The electric conduction is carried out,nDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA DC control switch in turn-off full bridge unitS 5 、S 8 Conduction, direct current control switchS 6 、S 7 The internal freewheeling diode of the capacitor is subjected to back pressure and cut off, the magnet energy is fed back to the energy storage capacitor bank for charging, the energy is quickly recovered, and the magnet voltage is-u c 。
Specifically, the control circuit provided in this embodiment may employ a controller and a PC, which are used to set parameters of the target magnetic field waveform, perform closed-loop adjustment on the output current, and monitor and determine abnormal conditions of overcurrent and overvoltage of the magnet. The PC is used for setting target waveform parameters (magnetic field rise time, amplitude, frequency, duty ratio, magnet cooling time and total duration) and magnet fault thresholds (overvoltage points and overcurrent points), setting control instructions of an operation mode (manual operation mode and automatic operation mode) and an operation mode (capacitor charging mode and magnet discharging mode), and sending the control instructions to the controller; the controller is used for completing the generation of a target reference waveform and the judgment of an operation mode according to a control instruction issued by the PC, and performing closed-loop adjustment according to the acquisition value of the detection circuit; if the manual operation mode is judged, configuring PWM control signals of 2n+4 paths of direct current control switches and control signals of m paths of converter switches according to the operation mode instruction; if the automatic operation mode is judged, the operation mode is automatically switched through the timer and the acquisition value of the detection circuit.
The heavy frequency flat-top pulse magnetic field generating device provided by the embodiment adoptsnThe structures of the phase half-bridge unit and the full-bridge unit realize voltage rising and falling by using a low-voltage direct current power supply, and charge the energy storage capacitor by using the full-bridge unit, so that the voltage of the energy storage capacitor can be pumped up to realize controllable high voltage, thereby controlling the rising time of a magnetic field,the rapid rise of the pulse magnetic field and the rapid recovery of energy are ensured; by means ofnThe phase half-bridge unit and the mixed current closed-loop control mode (hysteresis control and PI control in a magnet repetition frequency mode) can realize the flexibility of outputting magnetic field waveforms and high stability during a flat top period; secondly, in order to realize the quick energy storage of the energy storage capacitor bank, an RLC series resonance type charging mode is adopted in a capacitor bank charging mode, a mode that a plurality of energy storage capacitors are connected in parallel is adopted, the energy storage capacitor bank is controlled to charge in sequence and discharge cooperatively, and therefore the resonance frequency can be improved, the charging speed is higher, the charging current is smaller, the charging voltage is higher, the heating of a magnet is reduced, and the experimental efficiency is improved.
For a more clear description of the invention, the following description will be made with reference to specific examples:
as shown in FIG. 2, the heavy frequency flat-top pulse magnetic field generating device provided by the embodiment comprises a 4-phase half-bridge unitn=4) and by 4 series branchesm=4) energy storage capacitor bank formed in parallel, selected dc control switchS 1A 、S 1B 、S 2A 、S 2B 、S 3A 、S 3B 、S 4A 、S 4B Model FZ900R12KE4 module, maximum withstand voltage of collector-emitter is 1200V, continuous collector current 900A, and the required model is consistent, and meets withstand voltage>1200V, maximum continuous collector current>900A, the on-resistance is low, other models can be adopted, and no fixing requirement exists. DC control switchS 5 、S 6 、S 7 、S 8 Model FZ3600R17HP4 module, maximum withstand voltage 1700V of collector-emitter, continuous collector current 3600A, and consistent model requirements and meeting withstand voltage>1200V, maximum continuous collector current>3500A, low on-resistance, other types can be used without fixing requirement.
Converter switchS 1 、S 2 、S 3 、S 4 Model is FF1200R17IP5P module, single module is connected into bidirectional IGBT, maximum withstand voltage of collector-emitter is 1700V, continuous collector current is 1200A, the model is required to be consistent,and meet the pressure resistance>1200V, maximum continuous collector current>1200A can be conducted in two directions, the on-resistance is low, other models can be adopted, and no fixing requirement exists. Energy storage capacitorC 1 、C 2 、C 3 、C 4 For film capacitors (nominal parameters 1320 VDC/1 mF, model B25620B1108K 323), the model is required to be consistent; filtering inductanceL 1 、L 2 、L 3 、L 4 The inductance of the iron-silicon-aluminum magnetic ring is 100 mu H.
The magnet is used to convert the circuit current into a magnetic field. The electrical parameters of the magnet selected in this embodiment are: the inductance value is 320 mu H, and the resistance value is 10mΩ at 25 ℃. The coil field current specific constant was 3.4T/kA, i.e., a 3.4T field was generated per 1kA current. The magnet parameters have no fixed requirements, and the requirements can be met through simulation and experiments. Collecting filtering inductance current of each phasei p1 、i p2 、i p3 、i p4 A closed loop Hall current sensor with rated measurement current of 1000A is adopted as the current sensor CT, and T60404-P4640-X100 with model number of SPECIFICATION is selected; collecting magnet currenti m A closed loop Hall current sensor with rated measurement current of 3500A is adopted for the current sensor CT; the voltage sensor VT adopts sampling resistor voltage division to collect the voltage of the end of the energy storage capacitor; and the collected current and voltage are sent to a controller for real-time control.
The controller has the functions of: the flexible configuration of the related parameters of the magnetic field waveform is realized; control DC control switchS 1A 、S 1B 、S 2A 、S 2B 、S 3A 、S 3B 、S 4A 、S 4B 、S 5 、S 6 、S 7 、S 8 Converter switchS 1 、S 2 、S 3 、S 4 Is turned on and off; collecting signals of a current sensor CT and a voltage sensor VT, and performing closed-loop control according to the collected signals; realizing fault judgment of the device and ensuring safe and reliable operation of the device. The controller used in this embodiment is a DSP controller of TMS320F 28377D.
By adopting the configuration parameters, the waveform peak value (B) m ) The adjustable precision is 100mT, the frequency (1/T) range is continuously adjustable, and the magnetic field duty cycle (D) is continuously adjustable. The total duration of the pulse magnetic field application, the number of pulse continuous actions and the cooling time of the pulse group are adjustable. The reference current of the magnet is set to be 3kA, the corresponding pulse magnetic field is 3 multiplied by 3.4T=10.2T, the magnetic field frequency is 200Hz within the rising time of the magnetic field of 1ms, the duty ratio D=50% in each period is continuously acted for 5 pulse magnetic field periods, and the cooling time is 30 s. The resulting capacitor charge mode magnet current and storage capacitor voltage waveforms are shown in fig. 3. Correspondingly, the magnet current and the voltage waveforms of the energy storage capacitor in the magnet frequency-resetting mode are shown in fig. 4, and are consistent with the working modes. Therefore, the heavy frequency flat-top pulse magnetic field generating device provided by the invention can realize a pulse magnetic field with high frequency (200 Hz), steep pulse edge (less than or equal to 1 ms), flexible waveform configuration output and peak strength up to 10T.
The invention provides a heavy frequency flat-top pulse magnetic field generating device, which adoptsnThe structures of the phase half-bridge unit and the full-bridge unit realize voltage rising and falling by using a low-voltage direct current power supply, realize controllable high voltage by using an energy storage capacitor bank, effectively reduce the volume of the power supply, realize compact miniaturization of the device and flexible and controllable output of magnetic field waveforms, thereby generating a multi-parameter adjustable, steep rising edge and high-stability heavy frequency flat-top pulse magnetic field, improving the flexibility of the pulse magnetic field and providing experimental conditions of multi-dimensional heavy frequency flat-top pulse magnetic field waveforms.
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 (10)
1. A heavy frequency flat top pulsed magnetic field generating device, comprising:
main circuit comprising full bridge unitAnd in parallel withnThe input end of each phase of half-bridge unit is connected with the positive pole and the negative pole of the low-voltage direct-current power supply, the midpoint of a bridge arm of each phase of half-bridge unit is connected with the midpoint of one bridge arm of the full-bridge unit through a filter inductor, the midpoint of the other bridge arm of the full-bridge unit is connected with one end of a magnet, and the other end of the magnet is connected with the negative pole of the low-voltage direct-current power supply; and two bridge arms in the full-bridge circuit pass throughmThe series branch of the strip energy storage capacitor and the converter switch are connected,mthe series branches are connected in parallel to form an energy storage capacitor bank;
the detection circuit is used for collecting the terminal voltage of the energy storage capacitor, the current of the magnet and the current of each filter inductor in each series branch and feeding the terminal voltage, the current of the magnet and the current of each filter inductor back to the control circuit;
the control circuit is used for completing the generation of a target reference waveform and the judgment of the running mode according to the set target magnetic field waveform parameter, the magnet fault threshold, the running mode and the running mode, and performing closed-loop adjustment according to the acquisition value of the detection circuit; if the operation mode is a manual operation mode, configuring 2 in the main circuit according to the operation modenPWM control signal of +4 way DC control switchmThe control signal of the circuit converter switch automatically switches the operation mode through the timer and the acquisition value of the detection circuit if the operation mode is an automatic operation mode;
wherein PWM control signals of the two DC control switches in each phase half-bridge unit and the two DC control switches in each bridge arm of the full-bridge unit are complementary, and the phase angles of the PWM control signals of the DC control switches in each phase half-bridge circuit are respectively 0 ° 、360 ° /n、…、360 ° (n-1)/nThe method comprises the steps of carrying out a first treatment on the surface of the The operation mode comprises a capacitor charging mode and a magnet discharging mode, wherein the capacitor charging mode is divided into a magnet charging stage, a capacitor charging stage and a magnet energy discharging stage, and the magnet repetition frequency mode is divided into a magnet current rising stage, a magnet current flat-top stage and a magnet current falling stage.
2. The apparatus of claim 1, wherein one of the full-bridge circuits comprisesThe bridge arm comprises upper bridge arm direct current control switches connected in seriesS 5 And lower bridge arm direct current control switchS 6 The other bridge arm of the full-bridge circuit comprises a series connection upper bridge arm direct current control switchS 7 And lower bridge arm direct current control switchS 8 ；nThe upper bridge arm direct current control switches in the phase half bridge units are respectivelyS 1A 、S 2A 、…、S nA ，nThe lower bridge arm direct current control switches in the phase half bridge units are respectivelyS 1B 、S 2B 、…、S nB And (3) withnThe filter inductances correspondingly connected with the bridge arm midpoints of the phase half-bridge units are respectivelyL 1 、L 2 、…、L n ；
Wherein, during a magnet charging phase in the capacitor charging mode, the control circuit controlsnDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA And a DC control switch in a full bridge unitS 5 、S 7 Conducting to enable the low-voltage direct-current power supply to supply energy to each filter inductor and the magnet, and pumping and storing energy for the voltage of the energy storage capacitor bank;
during a capacitor charging phase in a capacitor charging mode, a control circuit controlsnDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA And a DC control switch in a full bridge unitS 5 、S 8 Conducting to make low-voltage DC power supply and filter inductanceL 1 、L 2 、…、L n And the energy stored by the magnet inductor charges the energy storage capacitor bank together to realize the voltage rising of the energy storage capacitor bank, and the energy is stored for the rapid rising of the current in the magnet repetition frequency mode;
during the magnet discharging phase in the capacitor charging mode, the control circuit controlsnDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA Direct current control switch in turn-off and full-bridge unitS 5 、S 8 Conducting, when allDC control switch in bridge unitS 6 、S 7 When the internal freewheeling diode of (1) receives back voltage and is cut off, the low-voltage direct-current power supply stops supplying power to the filter inductorL 1 、L 2 、…、L n And the remaining energy stored by the magnet inductance is fully charged to the storage capacitor bank.
3. The device for generating a repeated frequency flat-top pulsed magnetic field according to claim 2, wherein,mthe energy storage capacitors in the serial branches are respectivelyC 1 、C 2 、…、C m ，mThe converter switches in the serial branches are respectivelyS c1 、S c2 、…、S cm ；
The energy storage capacitor bank adopts a sequential charging mode, and the sequential charging mode is as follows: first, a converter switch is turned onS c1 Switch-off converter switchS c2 、S c3 、…、S cm The low-voltage direct-current power supply is led to the energy storage capacitorC 1 Charging, detecting the energy storage capacitor in the detection circuitC 1 After the voltage reaches the threshold value, the converter switch is turned offS c1 Conduction converter switchS c2 The above process is repeated to make the detection circuit detect the energy storage capacitorC 2 And the voltage is analogized to finish the charging of the energy storage capacitor bank.
4. The device for generating a repeated frequency flat-top pulsed magnetic field according to claim 3, wherein,
the control circuit controls the commutation switch during the magnet current rising phase in the magnet repetition frequency modeS c1 、S c2 、…、S cm The electric conduction is carried out,nDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA DC control switch in conducting and full bridge unitS 6 、S 7 DC control switch in conducting and full bridge unitS 5 、S 8 The internal freewheeling diode of the energy storage capacitor bank is subjected to back pressure cutoff, the energy storage capacitor bank and the low-voltage direct current power supply are in equivalent series discharge and cooperatively supply power to the magnet, and the optimal transient characteristic of the hysteresis controller is utilized to enable the current of the magnet to rise rapidly by utilizing the high-voltage high-power output of the energy storage capacitor bank;
the control circuit maintains the commutation switch during a magnet current plateau phase in a magnet repetition frequency modeS c1 、S c2 、…、S cm DC control switch in conducting and full bridge unitS 6 、S 8 DC control switch in conducting and full bridge unitS 5 、S 7 The internal freewheeling diode of (1) is subjected to back-pressure cutoff, and only the low-voltage direct current power supply supplies power to the magnet to induce current in each phasei p1 、i p2 、…、i pn PI controller with strong tracking ability is used for state feedback quantity by changingnDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA Duty cycle of PWM control signal versus magnet currenti m Negative feedback control is performed to maintain the average voltage of the magnet asR m i m ，R m The resistance value of the magnet resistor;
the control circuit maintains the commutation switch during a magnet current ramp down phase in a magnet repetition frequency modeS c1 、S c2 、…、S cm The electric conduction is carried out,nDC control switch in phase half-bridge unitS 1A 、S 2A 、…、S nA DC control switch in turn-off full bridge unitS 5 、S 8 DC control switch in conducting and full bridge unitS 6 、S 7 The internal freewheeling diode of the capacitor is subjected to back pressure and cut off, and the magnet energy is fed back to the energy storage capacitor bank for charging, so that the energy is quickly recovered.
5. The device of claim 4, wherein the inductance of each filter inductor is equal to each otherL p And the capacitance values of all the energy storage capacitors in the energy storage capacitor bank are equal.
6. The apparatus of claim 5, wherein the magnet current is increased during a magnet current ramp-up phasei m The expression of (2) is:
（1）
in the method, in the process of the invention,u c is the voltage of the storage capacitor bank;Cthe capacitance value of the energy storage capacitor bank; damping factorThe method comprises the steps of carrying out a first treatment on the surface of the Equivalent inductance->，L m The inductance value is the inductance value of the magnet; equivalent internal resistance->，R p Internal resistance of each filter inductor; resonance angular frequency of the device in the repetition frequency mode of operation +.>Damping oscillation angular frequency of device in heavy frequency operation mode；t m For magnet currenti m Rise time of (2); phase angle of the device in the repetition frequency mode of operation +.>；U s Is the voltage of the low-voltage direct current power supply;
capacity value of energy storage capacitor groupCThe expression of (2) is:
（2）
according to the formulas (1) and (2), the current rise time of the magnet and the required target magnet currenti m Determining the capacitance value of each energy storage capacitor in the energy storage capacitor bankC P 。
7. The device of claim 1, wherein the control circuit comprises a PC and a controller, wherein the PC is configured to set a target waveform parameter and a magnet fault threshold, set a control command of an operation mode and an operation mode, and send the control command to the controller; the controller is used for completing the generation of a target reference waveform and the judgment of an operation mode according to a control instruction issued by the PC, and performing closed-loop adjustment according to the acquisition value of the detection circuit; if the manual operation mode is judged, configuring 2 according to the operation mode instructionnPWM control signal of +4 way DC control switchmA control signal of the circuit-switching switch; if the automatic operation mode is judged, the operation mode is automatically switched through the timer and the acquisition value of the detection circuit.
8. The heavy frequency flat top pulsed magnetic field generating device of claim 1 or 7, wherein the target magnetic field waveform parameters comprise magnetic field rise time, amplitude, frequency, duty cycle, magnet cooling time, and total duration, and the magnet fault threshold comprises a magnet over-voltage point and an over-current point.
9. The device of claim 1, wherein the detection circuit comprises a voltage sensor VT for detecting voltages across the storage capacitors in each series branch, and a current sensor CT for detecting a current of the magnet and a filter inductanceL 1 、L 2 、…、L n Is set in the above-described range).
10. Use of a heavy frequency flat top pulsed magnetic field generating device according to any one of claims 1-9, characterized in that the heavy frequency flat top pulsed magnetic field generating device is used in the fields of terahertz sources and neutron diffraction.
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