CN111921097A - Pulse power supply for rail-kicking magnet - Google Patents
Pulse power supply for rail-kicking magnet Download PDFInfo
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- CN111921097A CN111921097A CN202010682865.6A CN202010682865A CN111921097A CN 111921097 A CN111921097 A CN 111921097A CN 202010682865 A CN202010682865 A CN 202010682865A CN 111921097 A CN111921097 A CN 111921097A
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1048—Monitoring, verifying, controlling systems and methods
- A61N5/1064—Monitoring, verifying, controlling systems and methods for adjusting radiation treatment in response to monitoring
- A61N5/1065—Beam adjustment
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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
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N2005/1085—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy characterised by the type of particles applied to the patient
- A61N2005/1087—Ions; Protons
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N2005/1092—Details
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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
- H02M1/0012—Control circuits using digital or numerical techniques
Abstract
The invention discloses a pulse power supply for a rail kicking magnet, which comprises: the power supply comprises a high-voltage power supply module, a low-voltage power supply module, a power conversion unit and a digital controller module; the power conversion unit comprises a switching tube and a diode and is used for controlling energy to flow between the kicking track magnet and the energy storage capacitor in order; one end of the digital controller module receives an external trigger control signal, one end of the digital controller module is connected with the power conversion unit, and the other end of the digital controller module samples an output current signal; the waveform of the output current of the pulse power supply is controlled by an external trigger signal, the rising edge of the trigger signal is an up-flow command, the falling edge of the trigger signal is a down-flow command, and a digital controller module drives a switching device in the power conversion unit so as to realize high-voltage rapid up-flow, low-voltage steady flow and reduction of output current ripples. Therefore, the waveform of the output current of the power supply can be trapezoidal wave, the repetition frequency can reach kilohertz, and the power supply can work in a direct current mode.
Description
Technical Field
The invention belongs to the field of pulse power supplies in proton heavy ion therapy, and particularly relates to a pulse power supply for a kicking rail magnet.
Background
In proton treatment apparatuses based on a cyclotron, a point scan technique is generally used as a scanning mode of a treatment terminal. The 250MeV continuous beam proton beam led out from the cyclotron is changed into a proton beam with the fixed energy from 70MeV to 240MeV continuous energy adjustable through an energy selection section, and then enters a treatment room through a corresponding beam transport line. During treatment with pen beam spot scanning, the proton beam needs to be driven into the patient for several milliseconds before switching to the next irradiation spot. During spot-to-spot and energy switching, a fast beam switch is required to reduce unnecessary radiation dose, and to be able to operate in dc mode to provide a fast safety interlock for the treatment system in case of failure. To achieve this function, there are generally two ways: the first is an electrostatic deflection plate scheme, which adopts an electrostatic deflection plate arranged in the first circle at the center of the cyclotron and kicks the proton beam out of the cyclotron before the proton beam is accelerated to high-energy particles; the second is a fast-kicking magnet scheme, which applies a kicking magnet system installed behind an accelerator to quickly deflect proton beams with fixed beam energy into a downstream Faraday cup. In the proton treatment system of the university of science and technology in Huazhong, a kicking magnet system is used as a main beam deflection mode, and an electrostatic deflection plate scheme is used as an alternative mode and a redundant design.
In the field of accelerators, a kicking magnet pulse power supply generally comprises: a cocker magnet pulse power supply, a convex rail magnet pulse power supply, a cutting magnet sine wave pulse power supply and the like are injected/extracted. The existing power supply scheme of the kicking track magnet can output trapezoidal waves or sine waves with repetition frequency up to kilohertz, but the power supply scheme is difficult to output trapezoidal waves with repetition frequency up to kilohertz and can work in a direct current mode.
Disclosure of Invention
Aiming at the defects and improvement requirements of the prior art, the invention provides a pulse power supply of a kicking magnet, aiming at realizing that the waveform of the output current of the power supply is trapezoidal wave, the repetition frequency can reach kilohertz, and the power supply can work in a direct current mode.
In order to achieve the above object, the present invention provides a pulsed power supply for a kicking rail magnet, comprising:
the high-voltage power supply module and the low-voltage power supply module are used for converting the alternating-current voltage signal into a direct-current voltage signal;
the power conversion unit comprises a switching tube and a diode; the high-voltage power supply module and the low-voltage power supply module are connected with the power conversion unit;
the first end of the digital controller module receives an external trigger control signal, the second end of the digital controller module is connected with the power conversion unit, and the third end of the digital controller module samples a current signal output by the track kicking magnet;
when the rising edge of the external trigger control signal is detected, the digital controller module controls the on and off of a switch tube in the power conversion unit to enable the high-voltage power supply module to work, so that the rail kicking magnet is enabled to rise current; when the output current signal is detected to reach a preset value, the low-voltage power supply module works to maintain the output current signal unchanged; when the falling edge of the external trigger control signal is detected, the high-voltage power supply module and the low-voltage power supply module do not work, and the energy in the rail kicking magnet charges the energy storage capacitor until the output current signal is reduced to zero.
Further, still include: and the output filter modules are used for forming high-damping oscillation with the kickrail magnet after the output current signal is reduced to zero.
Further, the output filter module is an LCR filter.
Further, the power conversion unit comprises three groups of IGBT switching tubes G1, G2, G3 and three groups of diodes D1, D2, D3; each group of IGBT switching tubes at least comprises one IGBT switching tube, and each group of diodes at least comprises one diode;
the second end of the digital controller module is connected with the power conversion unit, outputs two switching signals and one PWM driving signal, the ports for outputting the two switching signals are respectively connected with the grids of IGBT switching tubes G1 and G3, and the port for outputting the one PWM driving signal is connected with the grid of the IGBT switching tube G2;
when the rising edge of the external trigger control signal is detected, the IGBT switching tube G1 and the IGBT switching tube G3 are opened; when the output current signal is detected to reach a preset value, the IGBT switching tube G1 is closed, the IGBT switching tube G3 is opened, and the IGBT switching tube G2 is controlled by a PWM signal in a closed loop mode; when the falling edge of the external trigger control signal is detected, the IGBT switch tube G1, the IGBT switch tube G2 and the IGBT switch tube G3 are all closed.
Further, each group of IGBT switching tubes G1, G2 and G3 is respectively provided with a buffer circuit.
Furthermore, the high-voltage power supply module and the low-voltage power supply module are respectively connected with the high-voltage energy storage capacitor module and the low-voltage energy storage capacitor module in parallel, and the energy storage capacitor module is formed by connecting one or more energy storage capacitors in parallel.
Further, the high voltage power module and the low voltage power module include a transformer, a rectifier, and a filter circuit.
Further, the filter circuit is an LC filter, and is configured to filter a high-frequency voltage ripple present in a dc voltage signal output by the rectifier.
Furthermore, the digital controller module comprises an FPGA core control chip, a voltage sampling unit, a trigger signal receiving port and a direct current sensor.
Further, the direct current sensor is a zero-flux direct current sensor based on a fluxgate technology.
Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained:
(1) the digital controller module receives an external optical fiber trigger signal and samples an output current signal, the waveform of the output current of the pulse power supply is controlled by the external trigger signal, the rising edge of the trigger signal is an up-flow command, the falling edge of the trigger signal is a down-flow command, and the pulse length of the current signal is determined by the pulse width of the trigger signal; meanwhile, the digital controller module outputs Pulse Width Modulation (PWM) waves and switching signals to drive a switching device in the power conversion unit so as to realize high-voltage rapid current rise and low-voltage current stabilization and reduce output current ripples. Therefore, the waveform of the output current of the power supply can be trapezoidal wave, the repetition frequency can reach kilohertz, and the power supply can work in a direct current mode.
(2) The invention also comprises a group of output filter modules which are used for reducing the high-frequency voltage jitter of the output voltage signal and forming a high-damping oscillation with the kicking track magnet after the output current is reduced to zero, thereby reducing the current stabilization time.
(3) According to the invention, the IGBT is used as a current switch, so that the voltage resistance is stronger, and the repetition frequency can reach kilohertz according to the specific application requirements; in addition, a plurality of IGBT switch tubes and a plurality of diodes used in the invention can be connected in parallel to realize large current output, so that the amplitude of the output current is multiple times of that of a single IGBT switch tube.
Drawings
FIG. 1 is a schematic diagram of a pulsed power supply for a kicking magnet according to the present invention;
FIG. 2 is a timing logic diagram of the external trigger control signal and the switch tube according to an embodiment of the present invention;
fig. 3 is a circuit configuration diagram of an output filter according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an external trigger control signal before filtering and a corresponding output current waveform according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a filtered external trigger control signal and a corresponding output current waveform according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic diagram of a pulsed power supply for a kicking magnet according to the present invention. The kicking magnet is used for beam current fast switching in a power supply point switching process and an energy switching process in a proton treatment device point scanning process; can work in a direct current mode, and provides a safety interlock for the treatment device in an emergency; the rail kicking magnet is a main load of a pulse power supply and can be equivalently connected in series with a resistor and an inductor; the pulse power supply scheme of the track kicking magnet in the invention is to use high voltage current rise to increase the current rise speed of the track kicking magnet and use low voltage current stabilization to reduce the output current ripple.
The pulse power supply of the rail kicking magnet comprises:
the pre-stage voltage-stabilized power supply comprises a high-voltage power supply module and a low-voltage power supply module, and converts an alternating-current voltage signal of an external power grid into a required direct-current voltage signal; the preceding stage voltage-stabilized power supply comprises a transformer, a rectifier and a filter circuit; the filter circuit is an LC filter and is used for filtering high-frequency voltage ripples existing in the direct-current voltage signal output by the rectifier.
The power conversion unit comprises three groups of IGBT switching tubes G1, G2, G3 and three groups of diodes D1, D2 and D3, wherein each group of IGBT switching tubes at least comprises one IGBT switching tube, and each group of diodes at least comprises one diode;
and one end of the digital controller module is used for receiving an external trigger signal, one end of the digital controller module is connected with the power conversion module to output two paths of pulse control signals and one path of PWM (pulse-width modulation) driving signal, and the other end of the digital controller module is used for sampling an output current signal of a power supply.
In this embodiment, the output dc voltage of the high voltage power module is 400V, and the output dc voltage of the low voltage power module is 13V; the pulse magnet load can be equivalent to an inductive load L of 60 muHMAnd a 4.1m omega resistive load RMThe series connection of (1); the digital controller module is the most important part for controlling the pulse power supply of the kicking rail magnetAnd the system is developed based on FPGA and is used for receiving an external optical fiber trigger signal, performing current waveform control and current closed-loop PI operation, outputting a Pulse Width Modulation (PWM) wave and a switching device in a switching signal driving circuit, and providing local/remote control and corresponding hardware interlocking protection for a pulse power supply of a kicking rail magnet.
As shown in fig. 2, which is a timing logic diagram of an external trigger control signal and a switching tube provided in an embodiment of the present invention, the external trigger control signal of a pulse power supply is an optical fiber pulse signal, a rising edge of the external trigger control signal is an up-flow command, a falling edge of the external trigger control signal is a down-flow command, and a length of a current pulse is determined by a pulse width of the external control signal; according to the current control process, the whole current pulse process can be divided into an up-flow stage, a steady-flow stage and a down-flow stage.
In the current rising stage, the digital controller module turns on IGBT switching tubes G1 and G3, the high-voltage power supply module enables the kicking magnet to quickly rise, and current flows through CHG1, kicking-rail magnet, G3; when the current reaches a preset value, G1 is turned off, then the power supply enters a steady-current stage, an IGBT switching tube G2 is controlled by a PWM signal in a closed-loop mode, and the current is equivalent to a Buck circuit; in the current reduction stage, all the IGBT switching tubes G1, G2 and G3 are closed, current passes through the kicking rail magnet, so that energy in the form of a magnetic field is stored, and only unidirectional current can pass through the kicking rail magnet, so that the energy in the kicking rail magnet after the switching tubes are switched off charges the high-voltage energy storage capacitor through the diode D3 until the current is reduced to 0. After the current drops to 0, the output filter and the kicking magnet form a high damping oscillation, consuming the energy stored in the output filter capacitor.
In this embodiment, the duration of the current is determined by the pulse width of the external trigger control signal, and when the pulse width is infinite, the power supply operates in the dc mode.
In the rising current phase, the on time of the switching tube G1 is:
in the formula，LMInductance of magnet for kicking rail, VHIs a high voltage level, I0Is a current preset value. In the process of installation and debugging, the on-time of the switching tube G1 is adjusted according to the actual load condition so as to reduce the rising current overshoot of the output current.
In the steady-current stage, the duty ratio of the PI parameter of the switching device G2 starts from a certain fixed value to reduce the transition time from the current rising state to the steady-current stage and reduce the drift of the current.
In the embodiment, the high-voltage energy storage capacitor is equivalent to provide an energy pool for a rear switching circuit, so that the voltage stability of the voltage-stabilized source is improved on one hand, and the operation efficiency of the power supply is improved on the other hand; in the current rising and current falling stages, the voltage change in the high-voltage energy storage capacitor is controlled within a certain range, and the high-voltage energy storage capacitor meets the following requirements:
here, Δ V is a high-voltage direct-current voltage variation range. In this example, the value of the energy storage capacitor connected in parallel with the high voltage power supply module is 20 mF.
In this embodiment, the diode D2 is an isolation diode, which is used to protect the low voltage module during the current step-up.
In this embodiment, the optical fiber trigger interface is a multimode ST interface.
In the present embodiment, the dc current sensor is a zero-flux current sensor based on the fluxgate technology, and the current sensor used in the present example is ITN 600-subltab manufactured by LEM corporation.
In this embodiment, the two output ends of the dc current sensor are connected to a sampling resistor, the value of the sampling resistor is in the range of 0-25 Ω, in this example, VPR series low temperature drift non-inductive resistor manufactured by wegian corporation is used, and the value of the sampling resistor is 5 Ω.
In this embodiment, two ends of the sampling unit of the digital controller module are connected in parallel to the sampling resistor of the dc current sensor.
In the embodiment, the IGBT switching tubes G1, G2 and G3 are formed by connecting two 1200V/600A IGBT switching devices in parallel; the IGBT switching tubes G1 and G3 are connected with the switch control signal of the digital controller, and the IGBT switching tube G2 is connected with the PWM signal of the digital controller; the switching frequency of the PWM switching signal is 20 kHz.
In addition, the system also comprises a group of output filter modules which are used for reducing the high-frequency voltage jitter of the output voltage signal and forming a high-damping oscillation with the load after the output current reaches zero.
In this embodiment, the output filter module is a set of LCR filters, and two ends of each of the LCR filters are connected to the power output terminals.
As shown in fig. 3, which is a schematic diagram of an output filter, in this embodiment, the inductance value of the output filter is generally smaller than one tenth of the inductance of the load pulse magnet, and in this embodiment, the inductance is 2 μ H; r1 and C1 are generally small in value, the purpose is to form a low-pass filter circuit with filter inductance, high-frequency voltage jitter caused by the turn-on/turn-off process of IGBT switching tubes G1, G2 and G3 and diodes D1, D2 and D3 is reduced, in the example, R1 is 1 omega, and C1 is 0.47 mu H; r2 and C2 have larger values, form high-damping oscillation with a load pulse magnet after the current is reduced to zero, and reduce the current stabilization time, wherein R2 is 10 omega in the example, and C2 is 1 muH.
As shown in fig. 4, for the output voltage waveform and the output current waveform of the non-output filter in this example, the output voltage waveform has a problem of high frequency voltage oscillation under the condition of no output filter, which makes it difficult to meet the design requirement of power supply electromagnetic compatibility.
As shown in fig. 5, for the current waveform and the voltage waveform of the present example including the complete output filter, it can be seen from the test results that the voltage oscillation disappears, the output current is 510A, and the current rise time is about 61 μ s. It can be seen from the figure that, in the current rising process, the current rises linearly, after the current reaches the target value, the pulse power supply enters the steady-state stage quickly, and the current hardly overshoots; in the steady flow stage, the initial value of the PI regulator is a fixed value, so that the rapid conversion from the current rising process to the steady flow process can be realized, and the output current has no drift; after the current drops to zero, the load and the output filter form a high damping oscillation, which takes approximately 30 μ s to reduce the current to zero. Output voltage seamlessly switches among a plurality of levels in the whole process, so that the output of output current is fast and stable, compared with the traditional BUMP, kisker or kicking rail magnet power supply, the waveform of the output current is similar to trapezoidal waves, and the output current can always work in a direct current state.
In this embodiment, the output filter resistor is a non-inductive power resistor and is mounted on a water-cooling plate to reduce the temperature of the filter resistor during high-frequency operation.
It should be noted that the number of the switching power supply modules, the voltage values, and the number of the switching tubes are only used for illustrating the present embodiment, and the present disclosure is not limited thereto, and any person skilled in the art may adapt the present disclosure without departing from the technical idea of the present disclosure without departing from the protection scope of the present disclosure.
The invention relates to a pulse power supply for kicking a rail magnet, which is based on a scheme of high-voltage current rise and low-voltage current stabilization, and the pulse power supply obtained by the method has the following characteristics: the output current waveform is a trapezoidal wave-like pulse current, the working frequency is 0-1kHz, the bottom width and the top width of the current waveform can be freely controlled, and the current waveform can work in a direct current state; the trigger pulse is an optical fiber signal, the rising edge of the trigger signal is an up-flow command, the falling edge of the trigger signal is a down-flow command, and the length of the current pulse is determined by the pulse width of the trigger signal; the IGBT is used as a current switch, so that the voltage resistance is stronger, and the repetition frequency can reach kilohertz according to the specific application requirements. In addition, a plurality of IGBT switch tubes and a plurality of diodes used in the invention can be connected in parallel to realize large current output, so that the amplitude of the output current is multiple times of that of a single IGBT switch tube.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A pulse power supply for a track magnet, comprising:
the high-voltage power supply module and the low-voltage power supply module are used for converting the alternating-current voltage signal into a direct-current voltage signal;
the power conversion unit comprises a switching tube and a diode; the high-voltage power supply module and the low-voltage power supply module are connected with the power conversion unit;
the first end of the digital controller module receives an external trigger control signal, the second end of the digital controller module is connected with the power conversion unit, and the third end of the digital controller module samples a current signal output by the track kicking magnet;
when the rising edge of the external trigger control signal is detected, the digital controller module controls the on and off of a switch tube in the power conversion unit to enable the high-voltage power supply module to work, so that the rail kicking magnet is enabled to rise current; when the output current signal is detected to reach a preset value, the low-voltage power supply module works to maintain the output current signal unchanged; when the falling edge of the external trigger control signal is detected, the high-voltage power supply module and the low-voltage power supply module do not work, and the energy in the rail kicking magnet charges the energy storage capacitor until the output current signal is reduced to zero.
2. The pulsed power supply of claim 1, further comprising: and the output filter modules are used for forming high-damping oscillation with the kickrail magnet after the output current signal is reduced to zero.
3. The pulsed power supply of claim 2, wherein the output filter module is an LCR filter.
4. The pulse power supply of any one of claims 1 to 3, wherein the power conversion unit comprises three sets of IGBT switching tubes G1, G2, G3 and three sets of diodes D1, D2, D3; each group of IGBT switching tubes at least comprises one IGBT switching tube, and each group of diodes at least comprises one diode;
the second end of the digital controller module is connected with the power conversion unit, outputs two switching signals and one PWM driving signal, the ports for outputting the two switching signals are respectively connected with the grids of IGBT switching tubes G1 and G3, and the port for outputting the one PWM driving signal is connected with the grid of the IGBT switching tube G2;
when the rising edge of the external trigger control signal is detected, the IGBT switching tube G1 and the IGBT switching tube G3 are opened; when the output current signal is detected to reach a preset value, the IGBT switching tube G1 is closed, the IGBT switching tube G3 is opened, and the IGBT switching tube G2 is controlled by a PWM signal in a closed loop mode; when the falling edge of the external trigger control signal is detected, the IGBT switch tube G1, the IGBT switch tube G2 and the IGBT switch tube G3 are all closed.
5. The pulse power supply according to claim 4, wherein each group of IGBT switching tubes G1, G2 and G3 is provided with a buffer circuit respectively.
6. The pulse power supply according to claim 1, wherein the high voltage power supply module and the low voltage power supply module are respectively connected in parallel with a high voltage energy storage capacitor module and a low voltage energy storage capacitor module, and the energy storage capacitor module is composed of one or more energy storage capacitors connected in parallel.
7. The pulsed power supply of claim 1, wherein the high voltage power supply module and the low voltage power supply module comprise a transformer, a rectifier, and a filter circuit.
8. The pulse power supply according to claim 7, wherein said filter circuit is an LC filter for filtering out high frequency voltage ripples present in the dc voltage signal output from said rectifier.
9. The pulsed power supply of claim 1, wherein the digital controller module comprises an FPGA core control chip, a voltage sampling unit, a trigger signal receiving port, and a dc current sensor.
10. The pulsed power supply of claim 9, wherein the dc current sensor is a zero flux dc current sensor based on fluxgate technology.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113884959A (en) * | 2021-09-06 | 2022-01-04 | 中国科学院合肥物质科学研究院 | Flat-top-wave-like pulse high-intensity magnetic field generating device and method |
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