Field inversion device solid-state pulsed power system and timing control method thereof

Abstract

The application discloses a solid-state pulse power supply system of a field-reversed configuration device and a timing control method thereof. The solid-state pulse power supply system comprises a multiplexed load coil, and bias branches, ionization branches, anti-field branches and steady-state branches connected in parallel to both ends of the coil. Solid-state switching elements are used as main switches of the branches, and natural freewheeling is achieved by using diodes or bidirectional structures in the branches, so that independent freewheeling branches are completely cancelled. Meanwhile, the application is matched with a microsecond-level timing control method, a virtual impedance is formed by turning on the steady-state branches in advance to excite a reactance device, and pure physical series voltage division protection is realized. The application realizes full timing multiplexing of the coil function, reduces system stray inductance, volume and cost, can support kHz-level repetitive frequency operation, and significantly improves the reliability and stability of the field-reversed configuration device.

Description

Technical Field

[0001] This invention belongs to the field of pulse power technology, specifically relating to a solid-state pulse power supply system for a field inversion device and its timing control method. Background Technology

[0002] Field-Reversed Configuration (FRC) is a compact magnetic confinement fusion device configuration with an extremely high plasma pressure-to-magnetic pressure ratio (β value) and a simple coil structure, considered one of the potential pathways to fusion energy. The operation of a FRC device relies on a complex time-series magnetic field waveform: First, a certain amount of neutral gas is injected into the vacuum chamber, while the coil is discharged to apply an initial bias magnetic field. This initial bias magnetic field aims to create a suitable plasma environment. When the bias magnetic field reaches its maximum value, the coil is discharged again to generate a high-frequency oscillating magnetic field within the vacuum chamber. This high-frequency oscillating magnetic field ionizes the gas in the vacuum chamber and freezes the initial bias magnetic field; plasma gradually forms under the influence of the magnetic field through this process. Subsequently, the current in the coil rises rapidly, causing the main magnetic field to reverse rapidly, and the magnetic flux coupled to the internal plasma completes magnetic reconnection at the ends. This magnetic reconnection process forms a more stable and compact plasma. Throughout the entire operation of the device, a steady-state magnetic field is applied along its axis. In the anti-field configuration device, the axial steady-state magnetic field is not only the triggering condition for configuration formation and the physical basis for particle confinement, but also the key medium for stability control, shape adjustment and external energy coupling. The precise design and active control of its spatiotemporal distribution directly determine the plasma parameters and fusion performance of the anti-field configuration.

[0003] As field inversion configuration research progresses towards quasi-steady-state operation and high repetition frequency, traditional power supply technology has become a bottleneck restricting the improvement of device performance. For example... Figure 3 As shown, traditional field-reverse configuration power supply systems mainly use gas discharge switches (such as hydrogen thyratrons, ignition tubes, spark gap switches, etc.) as the main switching elements, and employ multiple independent coils and independent freewheeling branches. These traditional solutions have many significant and intertwined technical defects, which severely restrict the engineering process:

[0004] 1) Insufficient trigger synchronization accuracy is a fatal weakness of multi-switch parallel systems. Power supplies for field-reversing devices typically employ a multi-switch parallel topology to distribute peak currents ranging from tens to hundreds of kiloamperes. Traditional switches exhibit trigger jitter as high as 20-100 nanoseconds (hydrogen thyristors) or even 100-500 nanoseconds (ignition tubes). This time dispersion leads to significant differences in the conduction times of each parallel switch. The first switch to conduct is forced to bear the transient inrush current, causing severe current unevenness. Individual switches are highly susceptible to premature failure due to overcurrent, leading to cascading failures.

[0005] 2) Repetition frequency and lifespan are significant bottlenecks. Traditional switches are limited by gas ionization recovery time, electrode heat capacity, and material erosion rate, with typical repetition frequencies of only 0.1-10 Hz and electrical lifespans of only 10³-10⁻¹⁰. 5 The cycle is repeated. For example, after each discharge, a hydrogen thyratron requires several milliseconds to tens of milliseconds for the hydrogen inside to deionize and regain its pressure resistance; the ignition tube is limited by the kinetics of mercury vapor condensation and re-evaporation, resulting in an even lower repetition frequency. This low repetition characteristic makes it impossible for the device to achieve stable engineering operation, and the limited mechanical life means frequent maintenance downtime.

[0006] 3) High maintenance complexity and strong environmental sensitivity. The hydrogen thyratron is extremely sensitive to operating temperature; changes in hydrogen pressure inside the tube significantly affect the breakdown voltage and conduction characteristics. Furthermore, the cathode oxide coating gradually evaporates during frequent discharges, causing ignition voltage drift. The ignition tube must be installed strictly vertically to prevent uneven distribution of liquid mercury, and the evaporation and condensation process of mercury is greatly affected by temperature, requiring regular maintenance of the ignition electrode. The electrodes of the spark gap switch undergo continuous changes in spacing and morphology after severe arc erosion, leading to unstable breakdown voltage.

[0007] 4) Independent freewheeling branches and unidirectional switching topologies lead to system complexity. In traditional topologies, independent freewheeling branches increase system size, weight, and stray inductance. Simultaneously, unidirectional switching topologies struggle to meet the oscillating current requirements of the pre-ionization phase, limiting the optimization of ionization heating modes.

[0008] 5) Using independent coils to generate a steady-state magnetic field has structural defects. The scheme of having separate bias coils, anti-field coils, and steady-state coils requires multiple independent power supply systems, cooling circuits, and mechanical support structures, which increases the size, weight, and cost of the system. Moreover, the continuous energy consumption of the independent steady-state coils is extremely significant.

[0009] Therefore, there is an urgent need for a solid-state pulse power supply solution with high reliability, high repetition frequency, and compact structure to overcome the above-mentioned shortcomings of existing technologies. Summary of the Invention

[0010] The purpose of this invention is to provide a solid-state pulse power supply system based on semiconductor switches for field inversion configuration devices and its timing control method. By replacing all components with solid-state components, eliminating the freewheeling branch, and reusing coil functions, the pulse power supply system achieves high reliability, high repetition frequency, and compact structure.

[0011] To achieve the above objectives, the present invention proposes a solid-state pulse power supply system for a field inversion configuration device, comprising a load coil, a bias branch, an ionization branch, an inversion branch, and a steady-state branch. The load coil is a multiplexed coil, and the four branches—the bias branch, the ionization branch, the inversion branch, and the steady-state branch—are connected in parallel to each other and then connected to the two ends of the load coil.

[0012] The bias branch, ionization branch, reverse field branch and steady-state branch each include at least a solid-state switching element and a capacitor element connected in series, wherein the solid-state switching element in the ionization branch is a bidirectional solid-state switching element.

[0013] The capacitors in the bias branch, the reverse field branch, and the steady-state branch are all connected in parallel with unidirectional conductive elements in opposite directions.

[0014] The bias branch and the steady-state branch are also connected in series with reactive components;

[0015] The solid-state pulse power supply system has no independent freewheeling branch; the freewheeling path is naturally formed by utilizing the bidirectional structure of the unidirectional conductive element or the bidirectional solid-state switching element.

[0016] In one embodiment, the specific structural configuration of the bias branch is as follows:

[0017] The solid-state switching element, capacitor element, unidirectional conductive element, and reactance element in the bias branch are specifically a bias branch semiconductor switch, a bias branch capacitor, a bias branch diode, and a bias branch reactor, respectively. The bias branch reactor, bias branch semiconductor switch, and bias branch capacitor are connected in series in sequence, and the bias branch diode is connected in parallel across the two ends of the bias branch capacitor. The bias branch is used to apply an initial bias magnetic field to the load coil.

[0018] In one embodiment, the ionization branch is specifically configured as follows:

[0019] The bidirectional solid-state switching element and the capacitor element in the ionization branch are specifically a bidirectional semiconductor switching unit and an ionization branch capacitor, respectively. The capacitance value of the ionization branch capacitor is configured to form a high-frequency LC oscillation with the load coil.

[0020] The bidirectional semiconductor switch unit consists of two semiconductor switches connected in reverse parallel, or a single semiconductor switch plus a diode connected in reverse parallel.

[0021] In one embodiment, the specific structural configuration of the steady-state branch is as follows:

[0022] The solid-state switching element, capacitor element, unidirectional conductive element, and reactance element in the steady-state branch are specifically a steady-state branch semiconductor switch, a steady-state branch capacitor, a steady-state branch diode, and a steady-state branch reactor, respectively; the steady-state branch reactor, the steady-state branch semiconductor switch, and the steady-state branch capacitor are connected in series in sequence, and the steady-state branch diode is connected in parallel across the steady-state branch capacitor;

[0023] The steady-state branch is used to continuously apply an axial steady-state magnetic field to the load coil.

[0024] In one embodiment, the specific structural configuration of the reverse field branch is as follows:

[0025] The solid-state switching element, capacitor element, and unidirectional conductive element in the reverse field branch are specifically a reverse field branch semiconductor switch, a reverse field branch capacitor, and a reverse field branch diode, respectively. The reverse field branch semiconductor switch and the reverse field branch capacitor are connected in series, and the reverse field branch diode is connected in parallel across the two ends of the reverse field branch capacitor.

[0026] The reverse field branch is used to generate a rapidly reversing magnetic field on the load coil.

[0027] In one embodiment, at least one of the bias branch, ionization branch, reverse field branch, and steady-state branch has a saturated reactor or magnetic switch connected in series in the solid-state switching element circuit.

[0028] In one embodiment, the solid-state switching element is any one or a combination of a pulse thyristor, an insulated gate bipolar transistor, an integrated gate commutated thyristor, or a gate turn-off thyristor.

[0029] This invention also proposes a timing control method for the solid-state pulse power supply system described above, comprising the following steps:

[0030] Before the ionization branch is turned on, the solid-state switching element in the steady-state branch is turned on at a preset time, so that the reactive element in the steady-state branch establishes current in advance to form virtual impedance;

[0031] When the ionization branch or bias branch generates a rapidly changing current, a voltage is induced by the reactive element of the steady-state branch. This induced voltage forms a series voltage divider relationship with the voltage borne by the solid-state switching element of the steady-state branch, thereby reducing the voltage stress on the solid-state switching element of the steady-state branch.

[0032] In one embodiment, the preset time is a time window on the order of microseconds.

[0033] In one embodiment, the system achieves coil function multiplexing through seamless connection of the current waveforms of each branch, and the specific discharge timing includes:

[0034] During the application of a steady-state magnetic field:

[0035] The bias branch is switched on to discharge the load coil to apply an initial bias magnetic field;

[0036] When the bias magnetic field reaches its maximum value, the ionization branch is activated to discharge the load coil to generate a high-frequency oscillating magnetic field.

[0037] Then the reverse field branch is activated, causing the current in the load coil to rise rapidly in order to achieve rapid reversal of the main magnetic field;

[0038] Throughout the operation of the device: a steady-state magnetic field is applied axially to the load coil by conducting a steady-state branch.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1) Simplified system topology: The independent freewheeling branch is eliminated, and the freewheeling path is naturally formed by the reverse parallel diodes or bidirectional structure of each branch. This design not only eliminates the bypass switch and its control system, significantly reducing the size and weight of the power supply, but also significantly reduces stray inductance, thereby effectively improving the current rise rate and waveform quality.

[0041] 2) Extended lifespan and enhanced reliability: Replacing traditional gas switches with all-semiconductor switches eliminates mechanical wear and gas leakage issues, extending their lifespan by 3-4 orders of magnitude compared to gas switches, and supporting 10... 8 More than one pulse discharge.

[0042] 3) Increased frequency: Solid-state characteristics make it unrestricted by gas recovery time, supporting kHz-level repetition frequencies, providing a solid technical foundation for the quasi-steady-state operation and continuous plasma maintenance of field inversion devices.

[0043] 4) Cost optimization: By using a coil reuse strategy, functions are superimposed in the time dimension, eliminating the need for independent steady-state coils and their associated power supply systems. This not only reduces the number of magnet coils and further lowers the overall cost of the device, but also greatly simplifies the physical structure of the device and improves space utilization.

[0044] 5) Improved control precision: By utilizing the low jitter performance of semiconductor switches, nanosecond-level timing precision can be achieved, supporting complex magnetic field waveform optimization and plasma control. Attached Figure Description

[0045] Figure 1 This is a topology diagram of a solid-state pulse power supply system based on a semiconductor switch field inversion configuration device according to an embodiment of the present invention;

[0046] Figure 2This is the current waveform in the load coil under coil multiplexing conditions;

[0047] Figure 3 This is a topology diagram of a power supply system using gas switches;

[0048] Figure 4 A schematic diagram comparing system topologies using two different bidirectional switching units for the ionization branch.

[0049] Figure Labels

[0050] Bias branch-1, Ionization branch-2, Reverse field branch-3, Steady-state branch-4, Load coil-5, Bias branch reactor-11, Bias branch semiconductor switch-12, Bias branch capacitor-13, Bias branch diode-14, Bidirectional semiconductor switch unit-21, Ionization branch capacitor-22, Reverse field branch semiconductor switch-31, Reverse field branch capacitor-32, Reverse field branch diode-33, Steady-state branch reactor-41, Steady-state branch semiconductor switch-42, Steady-state branch capacitor-43, Steady-state branch diode-44. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0052] like Figure 1 As shown, this embodiment provides a solid-state pulsed power supply system for a field inversion device. This system changes the traditional spatially decoupled multi-coil architecture, employing a unique and multiplexed load coil 5 as the discharge core. Through seamless connection of the current waveforms of each branch, it ensures that the axial magnetic field at the coil center has no abrupt changes or zero points during timing transitions, maintaining the macroscopic stability of the plasma. Current adjustments at each time point in the circuit ensure a stable axial magnetic field within the device. In terms of hardware architecture, this multiplexing strategy completely eliminates the need for traditional independent steady-state coils, significantly reducing the number of magnet coils, lowering the overall cost of the power system, greatly simplifying the physical structure of the device, and significantly improving space utilization. The coil function multiplexing strategy of this embodiment, by replacing spatial hardware stacking with temporal-dimensional functional superposition, effectively improves the physical performance, engineering economy, and operational reliability of the field inversion device.

[0053] In this embodiment, the system consists of four parallel branches: bias branch 1, ionization branch 2, anti-field branch 3, and steady-state branch 4. These four branches work together to produce the specific magnetic field waveform required by the field inversion device. These four branches are directly connected in parallel to the two ends of the load coil. Bias branch 1, ionization branch 2, anti-field branch 3, and steady-state branch 4 each include at least a solid-state switching element and a capacitor element connected in series. The solid-state switching element in ionization branch 2 is a bidirectional solid-state switching element. A unidirectional conductive element is connected in reverse parallel across the capacitor elements in bias branch 1, anti-field branch 3, and steady-state branch 4. Bias branch 1 and steady-state branch 4 also each have a reactance element connected in series. In this embodiment, the solid-state switching element is preferably a semiconductor switch, the capacitor element is preferably a metallized film capacitor, the reactance element is preferably an air-core reactor, and the unidirectional conductive element is preferably a diode.

[0054] To address the issue of complex systems caused by independent freewheeling branches in traditional inverted field power supply systems, this system does not use independent freewheeling branches. Instead, it utilizes the reverse parallel diodes or bidirectional structures of each branch to naturally form freewheeling paths.

[0055] This embodiment replaces the underlying switching devices with solid-state components. The main switches for all four branches utilize high-power semiconductor switches, replacing the hydrogen thyristors or igniters used in traditional solutions, overcoming their short lifespan and large trigger jitter. In the field-reversed configuration, the use of semiconductor switches to replace traditional hydrogen thyristors, igniters, or spark gap switches, while simultaneously eliminating the original freewheeling branch, significantly simplifies the system topology and comprehensively improves operational performance. Currently, semiconductor switches can achieve on-state currents of hundreds of kiloamperes and turn-on times of several microseconds. Their silicon wafer area and junction temperature tolerance far exceed those of traditional hydrogen thyristors; a single switch can handle the current load that would otherwise require multiple switches in parallel, greatly reducing the workload of later maintenance and the complexity of the system. In traditional field-reversed power supply topologies, the freewheeling branch is typically composed of a dedicated bypass switch, used to provide a low-impedance freewheeling path when the coil current needs to decrease rapidly, preventing dangerous overvoltages in the coil inductance and ensuring the precise timing of the magnetic field reversal configuration. This branch not only increases the size, weight and cost of the system, but its multi-switch parallel structure also introduces additional triggering synchronization problems and points of failure.

[0056] The systemic benefits of topology simplification are multifaceted. First, hardware complexity is significantly reduced. Eliminating the switches, triggering systems, and current-sharing inductors of the freewheeling branch reduces the size and weight of the power cabinet, simplifies the stacked busbar design, and effectively suppresses stray inductance, thereby improving current rise rate and waveform quality. Second, control timing is refined. Traditional solutions require precise coordination of the main switch triggering, bypass switch triggering, and current transfer timing, involving multiple microsecond-level time windows in the control logic. In contrast, this single-stage structure only needs to control the turn-on time of the semiconductor switch, naturally achieving freewheeling through matching load parameters and charging voltage, significantly reducing the hardware and software overhead of the control system. Third, reliability is improved. The reduction in the number of components directly lowers the probability of system failure, eliminating current distribution conflicts and component overload risks caused by asynchronous triggering between the freewheeling and main branches.

[0057] Furthermore, the bidirectional solid-state switching element and the capacitor element in the ionization branch 2 are specifically a bidirectional semiconductor switching unit 21 and an ionization branch capacitor 22, respectively. The bidirectional semiconductor switching unit 21 consists of two semiconductor switches connected in reverse parallel, or a single semiconductor switch plus a diode connected in reverse parallel. Figure 4 The diagram illustrates a system topology using two different bidirectional switching units in the ionization branch. The capacitance of the ionization branch capacitor is configured to generate high-frequency LC oscillation with the load coil. Ionization branch 2 is used to generate high-frequency LC oscillation with the load coil 5 to handle positive and negative high-frequency oscillating currents. The current in the switch of this branch is also positive and negative high-frequency oscillating, so a bidirectional switch with a small-capacity capacitor in series is used to generate high-frequency LC oscillation with the coil. This bidirectional switching structure solves the problem that traditional unidirectional switches cannot handle alternating oscillating currents, meets the conduction requirements of positive and negative high-frequency oscillating currents, and enables the successful application of semiconductor switching technology in the pre-ionization system of a field-reversing configuration device.

[0058] The bias branch 1 includes a bias branch reactor 11, a bias branch semiconductor switch 12, and a bias branch capacitor 13 connected in series, with a bias branch diode 14 connected in parallel across the bias branch capacitor 13. The bias branch 1 is used to generate a reverse magnetic field, which is a crucial prerequisite for reversing the magnetic field direction. In this embodiment, by connecting the reactor in series with the branch, the inductance of this branch is increased, thereby increasing the discharge time of this branch. This allows the bias magnetic field to decay slowly, creating a time synchronization with the subsequent rapid reverse field process. Simultaneously, the diode connected in parallel across the capacitor prevents the capacitor from experiencing reverse voltage during discharge in other branches, avoiding aging or damage to the electrolytic or film capacitors due to reverse voltage and increasing the capacitor's lifespan.

[0059] The steady-state branch 4 includes a steady-state branch reactor 41, a steady-state branch semiconductor switch 42, and a steady-state branch capacitor 43 connected in series, with a steady-state branch diode 44 connected in reverse parallel across the steady-state branch capacitor. The steady-state branch is used to maintain the magnetic field after the reverse field, enabling coil reuse and replacing the steady-state coil. Specifically, the steady-state branch works in conjunction with the bias branch, ionization branch, and reverse field branch to achieve full-time multiplexing of the bias magnetic field, ionization magnetic field, reverse field magnetic field, and axial steady-state magnetic field on the load coil through timing control. The reactor connected in series on the steady-state branch has a dual function: firstly, it extends the discharge time, achieving millisecond-level maintenance of the steady-state magnetic field; secondly, it provides voltage clamping protection; and thirdly, when other branches discharge rapidly, the reactor limits the rate of change of current (di / dt), reducing the peak pulse voltage across the switch of this branch.

[0060] The reverse-field branch 3 includes a reverse-field branch semiconductor switch 31 and a reverse-field branch capacitor 32 connected in series, with a reverse-field branch diode 33 connected in reverse parallel across the capacitor. The reverse-field branch diode is used to provide reverse voltage protection and provide a freewheeling path to extend the capacitor discharge time.

[0061] The diodes connected in parallel across the capacitors in the bias, steady-state, and reverse-field branches described above will all naturally conduct when the capacitor discharges and the reverse voltage is about to be established, thus controlling the freewheeling current in the main circuit inductor. The main functions of the diodes connected in parallel with the capacitors in the reverse-field and steady-state branches include:

[0062] 1) Reverse voltage protection: Prevents the capacitor in this branch from being reverse-charged when other branches discharge;

[0063] 2) Extending discharge time: The diode provides a freewheeling path, making the capacitor discharge more smoothly;

[0064] 3) Cost optimization: By extending the discharge time, smaller capacity capacitors or lower voltage rating switching devices can be selected, reducing the overall power supply cost.

[0065] Furthermore, at least one branch of the system has a saturated reactor or magnetic switch connected in series in the circuit containing the solid-state switching element. Even further, the solid-state switching element is a semiconductor switch.

[0066] It should be understood that although semiconductor switches possess large current capacity, their tolerance for the initial current rise rate (di / dt) during turn-on is limited. Excessively high di / dt can lead to localized overheating and permanent failure of the device. In applications of field-reversing devices, the initial di / dt of the capacitor bank discharging the coil can reach tens of kA / μs. A saturated reactor or magnetic switch must be connected in series in the thyristor circuit. Utilizing the saturation characteristics of the magnetic core, a high impedance is provided to limit di / dt during the initial turn-on phase. Once the current is established, the magnetic core saturates and transitions to low impedance, avoiding the introduction of excessive additional inductance into the main discharge circuit. The design of this saturated reactor must be precisely matched to the thyristor's di / dt rating, the rate of rise of the trigger current, and the load inductance; this is a necessary measure to ensure the safe operation of the device.

[0067] Furthermore, the semiconductor switch can be any one or a combination of pulse thyristors, insulated gate bipolar transistors (IGBTs), integrated gate commutated thyristors (IGCTs), or gate turn-off thyristors (GTOs). Replacing traditional switches with semiconductor switches significantly improves system reliability and maintainability. The high current capacity and solid-state characteristics of semiconductor switches give them a lifespan far exceeding that of gas switches, supporting higher repetition frequencies and laying the foundation for quasi-steady-state operation in field-reversible configurations.

[0068] This invention also proposes a timing control method for the system described above, as follows:

[0069] Within a microsecond-level time window before the ionization branch is turned on, the solid-state switch of the steady-state branch is triggered in advance, causing a preset current to be established in the reactor of the steady-state branch, thereby forming a virtual impedance in the branch. In this embodiment, preferably, the solid-state switch of the steady-state branch is triggered in advance within 5 to 15 microseconds before the ionization branch is turned on.

[0070] When the ionization branch or bias branch is turned on and generates a rapidly changing current (di / dt), this changing current induces an induced voltage on the steady-state branch reactor. This induced voltage forms a series voltage divider relationship with the voltage borne by the steady-state branch solid-state switch, thereby using the virtual impedance to share the voltage stress on the switching device.

[0071] By adjusting the time window for early conduction, precise timing control can be achieved, allowing the induced voltage of the reactor to share part of the total voltage, thus realizing active protection at a purely physical level.

[0072] Furthermore, the above system achieves coil function multiplexing through seamless connection of the current waveforms of each branch. The specific discharge sequence includes:

[0073] During the application of a steady-state magnetic field: the bias branch is turned on to discharge the load coil to apply an initial bias magnetic field; when the bias magnetic field reaches its maximum value, the ionization branch is turned on to discharge the load coil to generate a high-frequency oscillating magnetic field; then the reverse field branch is turned on to make the current in the load coil rise rapidly to achieve rapid reversal of the main magnetic field.

[0074] Throughout the operation of the device, a steady-state magnetic field is applied axially to the load coil through a steady-state branch.

[0075] By controlling the conduction time of each branch, a current-carrying capacity can ultimately be generated within the load coil, such as... Figure 2 The magnetic field waveform shown can meet the requirements of the field inversion device for the magnetic field. Figure 2 This provides direct evidence that the technical solution of this application can indeed generate the required complex waveforms, and that the waveforms can be seamlessly connected to each other, ensuring that the central axial magnetic field has no abrupt changes or zero points during the time-series conversion process.

[0076] The embodiments described above are merely further illustrations of the present invention and are not intended to limit the present invention in any other way. The present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding modifications and changes based on the present invention, but all such modifications and changes should fall within the protection scope of the present invention.

Claims

1. A solid-state pulsed power supply system for a field-reversing configuration device, comprising a load coil, a bias branch, an ionization branch, a field-reversing branch, and a steady-state branch, characterized in that, The load coil is a multiplexed coil. The four branches, namely the bias branch, ionization branch, reverse field branch and steady-state branch, are connected in parallel to each other and then connected to the two ends of the load coil. Each of the bias branch, ionization branch, reverse field branch and steady-state branch includes at least a solid-state switching element and a capacitor element connected in series. The solid-state switching element in the ionization branch is a bidirectional solid-state switching element. The bias branch, the reverse field branch, and the steady-state branch all have unidirectional conductive elements connected in parallel across their capacitors. The bias branch and the steady-state branch are also connected in series with reactive elements, which are reactors. The solid-state pulse power supply system does not have an independent freewheeling branch, but instead utilizes the bidirectional structure of the unidirectional conductive element or the bidirectional solid-state switching element to naturally form a freewheeling path.

2. The solid-state pulse power supply system according to claim 1, characterized in that, The specific structural configuration of the bias branch is as follows: The solid-state switching element, capacitor element, unidirectional conductive element, and reactance element in the bias branch are specifically a bias branch semiconductor switch, a bias branch capacitor, a bias branch diode, and a bias branch reactor, respectively. The bias branch reactor, the bias branch semiconductor switch, and the bias branch capacitor are connected in series in sequence, and the bias branch diode is connected in parallel across the two ends of the bias branch capacitor. The bias branch is used to apply an initial bias magnetic field to the load coil.

3. The solid-state pulse power supply system according to claim 1, characterized in that, The specific structural configuration of the ionization branch is as follows: The bidirectional solid-state switching element and the capacitor element in the ionization branch are specifically a bidirectional semiconductor switching unit and an ionization branch capacitor, respectively. The capacitance value of the ionization branch capacitor is configured to form a high-frequency LC oscillation with the load coil. The bidirectional semiconductor switch unit consists of two semiconductor switches connected in reverse parallel, or a single semiconductor switch plus a diode connected in reverse parallel.

4. The solid-state pulse power supply system according to claim 1, characterized in that, The specific structural configuration of the steady-state branch is as follows: The solid-state switching element, capacitor element, unidirectional conductive element, and reactance element in the steady-state branch are specifically a steady-state branch semiconductor switch, a steady-state branch capacitor, a steady-state branch diode, and a steady-state branch reactor, respectively. The steady-state branch reactor, steady-state branch semiconductor switch, and steady-state branch capacitor are connected in series in sequence, and the steady-state branch diode is connected in parallel across the steady-state branch capacitor. The steady-state branch is used to continuously apply an axial steady-state magnetic field to the load coil.

5. The solid-state pulse power supply system according to claim 1, characterized in that, The specific structural configuration of the reverse field branch is as follows: The solid-state switching element, capacitor element, and unidirectional conductive element in the reverse field branch are specifically a reverse field branch semiconductor switch, a reverse field branch capacitor, and a reverse field branch diode, respectively. The reverse field branch semiconductor switch and the reverse field branch capacitor are connected in series, and the reverse field branch diode is connected in parallel across the two ends of the reverse field branch capacitor. The reverse field branch is used to generate a rapidly reversing magnetic field on the load coil.

6. The solid-state pulse power supply system according to claim 1, characterized in that, Among the bias branch, ionization branch, reverse field branch and steady-state branch, at least one branch has a saturated reactor or magnetic switch connected in series in the solid-state switching element circuit.

7. The solid-state pulse power supply system according to claim 1, characterized in that, The solid-state switching element is any one or a combination of a pulse thyristor, an insulated gate bipolar transistor, an integrated gate commutated thyristor, or a gate turn-off thyristor.

8. A timing control method applied to the solid-state pulsed power supply system according to any one of claims 1 to 7, characterized in that, Includes the following steps: Before the ionization branch is turned on, the solid-state switching element in the steady-state branch is turned on at a preset time, so that the reactive element in the steady-state branch establishes current in advance to form virtual impedance; When the ionization branch or bias branch generates a rapidly changing current, a voltage is induced by the reactive element of the steady-state branch. This induced voltage forms a series voltage divider relationship with the voltage borne by the solid-state switching element of the steady-state branch, thereby using the virtual impedance to share the voltage stress on the solid-state switching element of the steady-state branch.

9. The timing control method according to claim 8, characterized in that, The preset time is a sub-microsecond time window.

10. The timing control method according to claim 8, characterized in that, The system achieves coil function multiplexing through seamless connection of current waveforms in each branch. The specific discharge timing includes: During the application of a steady-state magnetic field: The bias branch is switched on to discharge the load coil to apply an initial bias magnetic field; When the bias magnetic field reaches its maximum value, the ionization branch is activated to discharge the load coil to generate a high-frequency oscillating magnetic field. Then the reverse field branch is activated, causing the current in the load coil to rise rapidly in order to achieve rapid reversal of the main magnetic field; Throughout the operation of the device: a steady-state magnetic field is applied axially to the load coil by controlling the conduction of the steady-state branch.

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