Energy feedback type pulse special power supply topology circuit

Abstract

The invention discloses an energy feedback type pulse special power supply topology circuit, particularly relates to the technical field of power supply circuits, and is technically characterized in that a forward energy storage unit is used for outputting forward current to an external load coil and providing energy required by main compression for a field inversion configuration device; the current source unit is used for receiving and storing electric energy, providing bias current for an external load coil and creating bias conditions for the field inversion configuration device; the negative energy storage unit is used for outputting negative current to an external load coil and providing bias field energy for the field inversion configuration device; the charging unit is also used for charging the current source unit; the resonance unit is used for outputting resonance current to an external load coil and providing energy required by pre-ionization for the field inversion configuration device; the first bidirectional combination switch is used for controlling the on-off of the resonance unit; and the second bidirectional combination switch and the third bidirectional combination switch are used for controlling the positive on-off and negative on-off of the circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply circuits, and in particular to an energy feedback type pulse special power supply topology circuit. Background Art

[0002] The field inversion device is a type of magnetic inertial confinement fusion device. The working process of the device using angular pinch field inversion is usually as follows: first, the fuel gas is filled into the chamber, and the bias capacitor discharges to generate a reverse initial bias magnetic field in the chamber; secondly, the pre-ionization capacitor discharges to ionize the fuel gas in the bias magnetic field to generate initial plasma; thirdly, the main capacitor discharges, the current of the external poloidal field coil is rapidly reversed, and the reverse magnetic field drives the radial implosion of the plasma in the chamber; then, after the reverse magnetic field reaches its maximum value, a crowbar switch is used to isolate the capacitor and the poloidal field coil, and the coil current gradually decays under the action of damping, and magnetic reconnection occurs at both ends of the plasma to form a closed magnetic surface, forming an initial field inversion; finally, the field inversion shrinks axially under the action of the magnetic tension generated by the curvature of the magnetic field at both ends, and finally the plasma achieves axial and radial force balance and reaches a stable state; and the high-voltage power supply is used to provide working current for the θ-pinch coil; Conventional field inversion device high voltage power supply topology such as Figure 1 In the topology, L3 is the line inductance, L1 is the external load coil, and the power supply is divided into four branches, which are generated by timing coordination. Figure 2 The θ pinch coil current shown; the existing power supply working process is divided into four steps. In the first step, H1 is turned on, L2 and C3 provide bias field current, and the power supply works in the Bias stage; in the second step, H2 is turned on, C1 provides resonant current to pre-ionize the fuel gas, and the power supply works in the PI stage; in the third step, H3 is turned on, C2 provides the main compression current to quickly reverse the magnetic field, and the power supply works in the Main stage; in the fourth step, H4 is turned on, the current slowly decreases, and the Crowbar is turned on.

[0003] Therefore, the traditional topology has the following disadvantages: (1) In the current topology, H1, H2, H3, and H4 are all hydrogen thyristors. The advantage of hydrogen thyristors is that the voltage and current of a single tube are high, and they are suitable for narrow pulse applications. The disadvantage is that the control is complex, the control power is large, and the hydrogen thyristor is susceptible to electromagnetic interference and environmental influences. (2) When modeling the field inversion theory, the deflection magnetic field uses a constant; in actual applications, the deflection magnetic field should change slowly or remain unchanged to avoid affecting the fuel gas. However, the bias field current generation principle of the traditional topology is that L2, L1 and C3 resonate to produce a sine wave, and the rising slope of the sine wave will affect the gas state; (3) The time when the pre-ionization circuit is put into operation is 1 / 4 of the sine wave period of the deflection magnetic field. Once the half-wave of the sine wave is missed, or the beginning of the negative half-wave is missed, the pre-ionization branch cannot generate a stable oscillation waveform after being put into operation; (4) After the main compression phase, the field change should be as small as possible. In traditional topologies, the freewheeling loop is added to the circuit to prevent the circuit from oscillating violently. However, if the coil current drops rapidly through the freewheeling loop, additional effects will be introduced.

[0004] Therefore, the present invention aims to provide an energy feedback pulse special power supply topology circuit to solve the above-mentioned related problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the existing high-voltage power supply topology often causes an unstable deflection magnetic field when providing current to the θ-pinch coil of a field inversion device. The purpose is to provide an energy-feedback pulse special power supply topology circuit. The circuit outputs positive or negative current to an external load coil through a positive energy storage unit and a negative energy storage unit, providing the field inversion device with the energy required for the main compression stage and the bias field stage. The negative energy storage unit can also receive electrical energy fed back from the external load coil and the current source unit after power supply is completed. The current source receives electrical energy to provide a bias current to the external load coil to create a bias condition. A resonant current is output through a resonant unit, which combines with the bias current on the external load coil to form a biased resonant current, thereby providing the energy required for pre-ionization of the field inversion device. A first sequential combination switch facilitates on-off control of the resonant unit, and a second and third bidirectional combination switches work together to control the on-off direction of the circuit's current path. The current source unit also controls the rise time of the bias field.

[0006] The present invention is achieved through the following technical solutions: An energy feedback pulse special power supply topology circuit, the circuit includes: The forward energy storage unit is used to output a forward current to the external load coil, providing the energy required for the main compression of the field inversion device; The negative energy storage unit is used to output a negative current to the external load coil to provide bias field energy for the field inversion device; it is also used to charge the current source unit; A current source unit is used to receive and store electrical energy and provide a bias current to an external load coil to create a bias condition for a field inversion device; The resonance unit is used to output a resonance current to an external load coil to provide the field inversion device with the energy required for pre-ionization; A first bidirectional combination switch, used to control the on and off of the resonant unit; The second bidirectional combination switch and the third bidirectional combination switch are used to control the positive switching and negative switching of the circuit.

[0007] Furthermore, the first connection terminal of the current source unit is connected to the first external port, the second external port is connected to the first connection terminal of the second bidirectional combination switch, and the second connection terminal of the current source is connected to the first connection terminal of the third bidirectional combination switch; The second connection end of the third bidirectional combination switch is connected to the first connection end of the negative energy storage unit, and the second connection end of the negative energy storage unit is connected to the third connection end of the third bidirectional combination switch; The third connection terminal of the third bidirectional combination switch is also connected to the third connection terminal of the second bidirectional combination switch, and the third connection terminal of the second bidirectional combination switch is also connected to the second connection terminal of the forward energy storage unit; the first connection terminal of the forward energy storage unit is connected to the second connection terminal of the second bidirectional combination switch; The first connection end of the resonance unit is connected to the first external port, the second connection end of the resonance unit is connected to the first connection end of the first bidirectional combination switch, and the second connection end of the first bidirectional combination switch is connected to the first connection end of the third bidirectional combination switch.

[0008] Furthermore, the topology structure further includes: an energy consumption unit, which is used to consume residual energy after the current source unit works.

[0009] Furthermore, the energy consumption unit is connected in series between the second connection terminal of the third bidirectional combination switch and the first connection terminal of the negative energy storage unit.

[0010] Furthermore, the second bidirectional combination switch includes a second positive switch and a second negative switch; The second connection end of the second positive switch is connected to the first connection end of the second negative switch, and the connected connection end serves as the first connection end of the second bidirectional combination switch and is connected to the second external port; The first connection end of the second forward switch serves as the second connection end of the second bidirectional combination switch and is connected to the first connection end of the forward energy storage unit; The second connection end of the second negative switch serves as the third connection end of the second bidirectional combination switch and is connected to the second connection end of the positive energy storage unit and the third connection end of the third bidirectional combination switch.

[0011] Further, the third bidirectional combination switch includes a third negative switch and a third positive switch; The second connection terminal of the third negative switch is connected to the first connection terminal of the third positive switch, and the connected connection terminal serves as the first connection terminal of the third bidirectional combination switch and is connected to the second connection terminal of the current source unit; The first connection end of the third negative switch serves as the second connection end of the third bidirectional combination switch and is connected to the first connection end of the negative energy storage unit; The second connection end of the third positive switch serves as the third connection end of the third bidirectional combination switch and is connected to the second connection end of the negative energy storage unit and the third connection end of the second bidirectional combination switch.

[0012] Furthermore, the positive energy storage unit includes a positive energy storage capacitor, the first connection end of the positive energy storage capacitor is the first connection end of the positive energy storage unit, and is connected to the first connection end of the second positive switch; the second connection end of the positive energy storage capacitor is the second connection end of the positive energy storage unit, and is connected to the second connection end of the first negative switch.

[0013] Furthermore, the negative energy storage unit includes a negative energy storage capacitor, the first connection end of the negative energy storage capacitor is the first connection end of the negative energy storage unit, and is connected to the first connection end of the third negative switch; the second connection end of the negative energy storage capacitor is the second connection end of the negative energy storage unit, and is connected to the second connection end of the second negative unit.

[0014] Further, the first bidirectional combination switch includes a first positive switch and a first negative switch; The first connection end of the first forward switch is connected to the second connection end of the resonant unit, the second connection end of the first forward switch is connected to the first connection end of the first negative switch, and the second connection end of the first negative switch is connected to the first connection end of the third bidirectional combination switch.

[0015] Furthermore, the resonant unit includes a resonant capacitor, a first connection end of the resonant capacitor serves as the first connection end of the resonant unit and is connected to the first external port; a second connection end of the resonant capacitor serves as the second connection end of the resonant unit and is connected to the first connection end of the first forward switch.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: In the present invention, an energy feedback pulse special power supply topology circuit is provided, which outputs positive or negative current to the external load coil through the positive energy storage unit and the negative energy storage unit to provide the field inversion device with the energy required for the main compression stage and the bias field stage. At the same time, the negative energy storage unit can also receive the electric energy fed back by the external load coil and the current source unit after the power supply is completed; the bias current is provided to the external load coil by receiving electric energy through the current source to create a bias condition; the resonant current is output through the resonant unit, which is combined with the bias current on the external load coil to form a resonant current with a bias, thereby providing the field inversion device with the energy required for pre-ionization; the on-off of the resonant unit is conveniently controlled by the first sequence combination switch, and the on-off direction of the current path of the circuit is controlled by the joint action of the second bidirectional combination switch and the third bidirectional combination switch; and the rise time of the bias field is also controlled by the current source unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the examples. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be considered as limiting the scope. A person of ordinary skill in the art can also derive other relevant drawings based on these drawings without inventive effort. In the drawings: Figure 1 This is a schematic diagram of the high-voltage power supply topology circuit of a traditional field inversion device; Figure 2 Schematic diagram of coil current generated by the high voltage power supply topology circuit of the traditional field inversion device; Figure 3 This is a schematic diagram of module connections of an energy feedback pulse special power supply topology circuit in this embodiment; Figure 4 Schematic diagram of a circuit of an energy feedback pulse special power supply topology circuit in this embodiment; Figure 5 Schematic diagram of switch control timing of an energy feedback pulse special power supply topology circuit in this embodiment; Figure 6 This is an output current waveform diagram of an energy feedback pulse special power supply topology circuit in this embodiment; Figure 7 This is a current waveform diagram of a current source unit in an energy feedback pulse special power supply topology circuit in this embodiment; Figure 8 This is the output current waveform diagram of the resonant unit in this embodiment when the initial voltage is 1800V; Figure 9 : This is the output current waveform diagram of the resonant unit in this embodiment when the initial voltage is 1000V; Figure 10 Output current waveform diagram of a forward current pulse width of 187 μs provided to the forward energy storage capacitor in this embodiment; Figure 11 The output current waveform diagram of the forward energy storage capacitor in this embodiment provides a forward current pulse width of 87μs. DETAILED DESCRIPTION

[0018] The following description of exemplary embodiments of the present disclosure is made in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be appreciated by those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0019] In this disclosure, unless otherwise specified, the use of terms such as "first" and "second" to describe various elements is not intended to limit the positional relationship, temporal relationship, or importance relationship of these elements. Such terms are only used to distinguish one element from another. In some examples, the first element and the second element may refer to the same instance of the element, while in some cases, based on the context of the description, they may also refer to different instances.

[0020] The terms used in the descriptions of various examples in this disclosure are for the purpose of describing specific examples only and are not intended to be limiting. Unless the context clearly indicates otherwise, if the number of elements is not specifically limited, the element may be one or more. In addition, the term "and / or" used in this disclosure encompasses any one and all possible combinations of the listed items.

[0021] The present invention provides an energy-feedback pulse special power supply topology circuit, proposing a topology based on semiconductor devices to provide a specific waveform for the θ-pinch coil of a field inversion device. Through the current outputs of a positive energy storage unit, a negative energy storage unit, and a resonant unit, as well as the bias current provided by a current source unit, combined with the coordinated control of multiple switches, a specific current waveform is provided for the θ-pinch coil of the field inversion device (the current rapidly drops to a negative current of a certain value, then oscillates at the negative current peak, and after multiple oscillation wave heads, the current rapidly rises to a positive current of a certain value, then maintains a positive current flat top, and finally the current rapidly drops), thereby solving the problem of unstable deflection magnetic field in traditional topologies.

[0022] Example See also Figure 3 , Figure 3A schematic diagram of the module connection of an energy-feedback pulse special power supply topology circuit is given, wherein a positive energy storage unit is used to output a positive current to an external load coil to provide the field inversion device with the energy required for main compression; a negative energy storage unit is used to output a negative current to the external load coil to provide the field inversion device with bias field energy; and is also used to charge a current source unit; a current source unit is used to receive and store electrical energy and provide a bias current to the external load coil to create a bias condition for the field inversion device; a resonance unit is used to output a resonant current to the external load coil to provide the field inversion device with the energy required for pre-ionization; a first bidirectional combination switch is used to control the on / off of the resonance unit; and a second bidirectional combination switch and a third bidirectional combination switch are used to control the positive on / off and negative on / off of the circuit.

[0023] In which, the first connection terminal of the current source unit is connected to the first external port, the second external port is connected to the first connection terminal of the second bidirectional combination switch, and the second connection terminal of the current source is connected to the first connection terminal of the third bidirectional combination switch; the second connection terminal of the third bidirectional combination switch is connected to the first connection terminal of the negative energy storage unit, and the second connection terminal of the negative energy storage unit is connected to the third connection terminal of the third bidirectional combination switch; the third connection terminal of the third bidirectional combination switch is also connected to the third connection terminal of the second bidirectional combination switch, and the third connection terminal of the second bidirectional combination switch is also connected to the second connection terminal of the positive energy storage unit; the first connection terminal of the positive energy storage unit is connected to the second connection terminal of the second bidirectional combination switch; the first connection terminal of the resonant unit is connected to the first external port, the second connection terminal of the resonant unit is connected to the first connection terminal of the first bidirectional combination switch, and the second connection terminal of the first bidirectional combination switch is connected to the first connection terminal of the third bidirectional combination switch.

[0024] It should be noted that, in this embodiment, the external load coil specifically refers to the θ-pinch coil of the field inversion device, and the first external port and the second external port are respectively connected to the two ends of the θ-pinch coil; it should also be noted that before using this power supply topology, the positive energy storage unit, the negative energy storage unit and the resonant unit need to be charged in advance; at the same time, based on actual needs, the control timing of the first bidirectional combination switch, the second bidirectional combination switch and the third bidirectional combination switch are set. This technical content is a conventional technical means in this field and will not be elaborated on here; through the joint action of the second bidirectional combination switch and the third bidirectional combination switch, the positive current path and the negative current path of the circuit are turned on and off; at the same time, the current source unit adopts an energy storage inductor, which is charged by the negative energy storage unit when in use.

[0025] As a possible implementation, the first bidirectional combination switch includes a first forward switch and a first negative switch; the first connection end of the first positive switch is connected to the second connection end of the resonant unit, the second connection end of the first positive switch is connected to the first connection end of the first negative switch, and the second connection end of the first negative switch is connected to the first connection end of the third bidirectional combination switch.

[0026] It should be noted that, in this embodiment, the first forward switch and the first negative switch are generally opened and closed at the same time during operation. The first forward switch and the first negative switch work together to control the on and off of the resonant unit, and can further control the time of the resonant stage. The first forward switch is composed of an IGBT component Q1 and a freewheeling diode D1 connected in reverse parallel to the IGBT component Q1. The first negative switch is composed of an IGBT component Q2 and a freewheeling diode D2 connected in reverse parallel to the IGBT component Q2. Both of them can be used as fully-controlled switches, and other high-speed fully-controlled devices can also be used instead. No excessive restrictions are imposed here.

[0027] As a possible implementation, the resonant unit includes a resonant capacitor, and the first connection end of the resonant capacitor serves as the first connection end of the resonant unit and is connected to the first external port; the second connection end of the resonant capacitor serves as the second connection end of the resonant unit and is connected to the first connection end of the first forward switch.

[0028] It should be noted that, in this embodiment, the resonant unit is used to output current to the external load coil, thereby providing the field inversion device with the energy required for pre-ionization. At the same time, a varistor can be connected in parallel to the resonant capacitor according to actual conditions to limit the voltage of the resonant capacitor. At the same time, the frequency and amplitude of the oscillation waveform can be changed by changing the initial charging voltage of the resonant capacitor. For example, the resonant frequency is obtained by calculating the parameters of the energy storage inductor L2 and the resonant capacitor C1, see Figure 8 and Figure 9 As shown in FIG, two initial charging voltages of the resonant capacitor C1 are given, and it is clearly seen that the resonant amplitude changes after changing the resonant capacitor voltage.

[0029] As a possible implementation, the second bidirectional combination switch includes a second positive switch and a second negative switch; the second connection end of the second positive switch is connected to the first connection end of the second negative switch, and the connected connection end serves as the first connection end of the second bidirectional combination switch and is connected to the second external port; the first connection end of the second positive switch serves as the second connection end of the second bidirectional combination switch and is connected to the first connection end of the positive energy storage unit; the second connection end of the second negative switch serves as the third connection end of the second bidirectional combination switch and is connected to the second connection end of the positive energy storage unit and the third connection end of the third bidirectional combination switch; The third bidirectional combination switch includes a third negative switch and a third positive switch; the second connection end of the third negative switch is connected to the first connection end of the third positive switch, and the connected connection end serves as the first connection end of the third bidirectional combination switch and is connected to the second connection end of the current source unit; the first connection end of the third negative switch serves as the second connection end of the third bidirectional combination switch and is connected to the first connection end of the negative energy storage unit; the second connection end of the third positive switch serves as the third connection end of the third bidirectional combination switch and is connected to the second connection end of the negative energy storage unit and the third connection end of the second bidirectional combination switch.

[0030] It should be noted that, in this embodiment, the on-off direction of the circuit is controlled by the mutual cooperation between the second forward switch, the second negative switch, the third negative switch and the third forward switch; the second forward switch is composed of an IGBT component Q3 and a freewheeling diode D3 connected in reverse parallel to the IGBT component Q3, and the second negative switch is composed of an IGBT component Q4 and a freewheeling diode D4 connected in reverse parallel to the IGBT component Q4; the third negative switch is composed of an IGBT component Q6 and a freewheeling diode D6 connected in reverse parallel to the IGBT component Q6, and the third forward switch is composed of an IGBT component Q5 and a freewheeling diode D5 connected in reverse parallel to the IGBT component Q5. They can all be used as fully-controlled switches and can also be replaced by other high-speed fully-controlled devices, without making too many restrictions here.

[0031] At the same time, it should be noted that reverse parallel connection refers to reverse connection according to the current flow direction of the IGBT component and the freewheeling diode. This technology is a conventional technical means in this field and will not be elaborated here.

[0032] As a possible implementation, the positive energy storage unit includes a positive energy storage capacitor, the first connection end of the positive energy storage capacitor is the first connection end of the positive energy storage unit, and is connected to the first connection end of the second positive switch; the second connection end of the positive energy storage capacitor is the second connection end of the positive energy storage unit, and is connected to the second connection end of the first negative switch.

[0033] It should be noted that, in this embodiment, the forward energy storage capacitor stores electrical energy and is used to provide current to the θ-pinch coil after the circuit is turned on, thereby providing the field inversion device with the energy required for main compression; at the same time, a varistor can be connected in parallel to the forward energy storage capacitor according to actual conditions, in order to limit the voltage of the forward energy storage capacitor.

[0034] As a possible implementation, the negative energy storage unit includes a negative energy storage capacitor, the first connection end of the negative energy storage capacitor is the first connection end of the negative energy storage unit, and is connected to the first connection end of the third negative switch; the second connection end of the negative energy storage capacitor is the second connection end of the negative energy storage unit, and is connected to the second connection end of the second negative unit.

[0035] It should be noted that, in this embodiment, the negative energy storage capacitor stores electrical energy and is used to provide current to the θ-pinch coil after the circuit is turned on, thereby providing the energy required for the bias field for the field inversion device and charging the resonant unit during the rising phase of the bias field. At the same time, a varistor can be connected in parallel to the negative energy storage capacitor according to actual conditions to limit the voltage of the negative energy storage capacitor. The energy feedback of the current source unit and the θ-pinch coil may cause the negative energy storage capacitor to exceed the rated voltage.

[0036] As a possible implementation, the topology structure further includes: an energy consumption unit for consuming residual energy after the current source unit operates; wherein the energy consumption unit is connected in series between the second connection terminal of the third bidirectional combination switch and the first connection terminal of the negative energy storage unit.

[0037] It should be noted that, in this embodiment, the energy consumption unit is composed of a consumption resistor R1 and a diode D9 connected in parallel. By connecting the consumption resistor R1 and the diode D9 in parallel, the residual energy on the current source unit is consumed after a discharge cycle to avoid damage to the device. In other embodiments, the consumption unit can also consume the residual energy on the external coil at the same time.

[0038] Workflow: See Figure 4 As shown in the figure, a circuit diagram of an energy feedback pulse special power supply topology circuit is given. When in use, the power supply circuit is connected to the θ-pinch coil of the field inversion device (for example Figure 4 and set the switch control timing (for example Figure 5 shown); First, when time t1 is reached, IGBT components Q4 and Q6 are triggered respectively (see the switch control timing for details). Figure 5 The bias field rise sequence in the figure opens the negative current path, providing current to the θ-pinch coil L1 through the negative energy storage capacitor C3, while charging the energy storage inductor L2 (see Figure 7 As shown in the figure), bias conditions are created for the next resonant operation. At this time, the current path is C3-D9-Q6-L2-L1-Q4-C3. The current waveform of the input θ-pinch coil L1 is shown in the figure. Figure 6 The t1-t2 period in When the time t2 is reached, the IGBT component Q6 is turned off (see the switch control timing for details). Figure 5 The current path is L2-L1-Q4-D5-L2. The energy storage inductor L2 is used to provide the flat-top current of the bias phase for the θ-pinch coil L1. The current waveform of the input θ-pinch coil L1 is shown in Figure 6 The t2-t3 period in When the time t3 is reached, IGBT components Q5, Q1 and Q2 are triggered (see the switch control timing for details). Figure 5 Pre-ionization timing), the resonant current output by the resonant capacitor C1 is combined with the bias current output by the energy storage inductor L2 to form a biased resonant current waveform on the θ-pinch coil L1. At this time, there are three current paths, the first of which is L2-L1-Q4-D5-L2, the second is L2-C1-D1-Q2-L2, and the third is C1-L1-Q4-D5-D2-Q1-C1. The current waveform of the input θ-pinch coil L1 can be seen in Figure 6 The t3-t4 period in When time t4 is reached, IGBT components Q4, Q1 and Q2 are turned off, and IGBT component Q3 is triggered (see the switch control timing for details). Figure 5 Main compression timing diagram), open the forward current path, the forward energy storage capacitor C2 causes the current of L1 to reverse, the current path is C2-Q3-L1- L2-Q5-C2, the current waveform of the input θ-pinch coil L1 is shown in Figure 6 During the t4-t5 period, IGBT components Q3 and Q5 continue to be turned on. When the energy of the forward energy storage capacitor C2 is consumed, the current path becomes L2-Q5-D4-L1-L2. The current waveform of the input θ-pinch coil L1 is shown in Figure 2. Figure 6 The t5-t6 period in the At time t5, IGBT components Q3 and Q5 are turned off. At this time, the current path is L2-D6-R1-C3-D4-L1-L2. The energy on the energy storage inductor L2 and the θ-pinch coil L1 is fed back to the negative energy storage capacitor C3. The voltage of the negative energy storage capacitor C3 rises rapidly. After the consumption of the resistor R1, the energy injected into the negative energy storage capacitor C3 can be limited, which accelerates the current drop rate. The current waveform of the input θ-pinch coil is shown in Figure 2. Figure 6 The t6-t7 period.

[0039] Specifically, in this embodiment, the length of the t2-t3 period can be changed to control the bias current flat-top time, thereby providing a longer stable bias current; the length of the t4-t5 period can also be changed to control the stable current time after the main compression, thereby providing a longer stable current after the main compression; for example, see Figure 10-11 As shown, two forward current pulse widths provided by the forward energy storage capacitor C2 are given. It can be clearly seen that the forward current pulse width can control the stable current time after the main compression.

[0040] The above specific implementation methods further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific implementation methods of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An energy feedback pulse special power supply topology circuit, characterized in that: The circuit includes: The forward energy storage unit is used to output a forward current to the external load coil, providing the energy required for the main compression of the field inversion device; The negative energy storage unit is used to output a negative current to the external load coil to provide bias field energy for the field inversion device; it is also used to charge the current source unit; A current source unit is used to receive and store electrical energy and provide a bias current to an external load coil to create a bias condition for a field inversion device; The resonance unit is used to output a resonance current to an external load coil to provide the field inversion device with the energy required for pre-ionization; A first bidirectional combination switch, used to control the on and off of the resonant unit; The second bidirectional combination switch and the third bidirectional combination switch are used to control the positive switching and negative switching of the circuit.

2. An energy feedback pulse special power supply topology circuit according to claim 1, characterized in that: The first connection terminal of the current source unit is connected to the first external port, the second external port is connected to the first connection terminal of the second bidirectional combination switch, and the second connection terminal of the current source is connected to the first connection terminal of the third bidirectional combination switch; The second connection end of the third bidirectional combination switch is connected to the first connection end of the negative energy storage unit, and the second connection end of the negative energy storage unit is connected to the third connection end of the third bidirectional combination switch; The third connection terminal of the third bidirectional combination switch is also connected to the third connection terminal of the second bidirectional combination switch, and the third connection terminal of the second bidirectional combination switch is also connected to the second connection terminal of the forward energy storage unit; the first connection terminal of the forward energy storage unit is connected to the second connection terminal of the second bidirectional combination switch; The first connection end of the resonance unit is connected to the first external port, the second connection end of the resonance unit is connected to the first connection end of the first bidirectional combination switch, and the second connection end of the first bidirectional combination switch is connected to the first connection end of the third bidirectional combination switch.

3. An energy feedback pulse special power supply topology circuit according to claim 2, characterized in that: The first bidirectional combination switch includes a first positive switch and a first negative switch; The first connection end of the first forward switch is connected to the second connection end of the resonant unit, the second connection end of the first forward switch is connected to the first connection end of the first negative switch, and the second connection end of the first negative switch is connected to the first connection end of the third bidirectional combination switch.

4. An energy feedback pulse special power supply topology circuit according to claim 3, characterized in that: The resonant unit includes a resonant capacitor, a first connection end of the resonant capacitor serving as the first connection end of the resonant unit and connected to the first external port; a second connection end of the resonant capacitor serving as the second connection end of the resonant unit and connected to the first connection end of the first forward switch.

5. An energy feedback pulse special power supply topology circuit according to claim 2, characterized in that: The second bidirectional combination switch includes a second positive switch and a second negative switch; The second connection end of the second positive switch is connected to the first connection end of the second negative switch, and the connected connection end serves as the first connection end of the second bidirectional combination switch and is connected to the second external port; The first connection end of the second forward switch serves as the second connection end of the second bidirectional combination switch and is connected to the first connection end of the forward energy storage unit; The second connection end of the second negative switch serves as the third connection end of the second bidirectional combination switch and is connected to the second connection end of the positive energy storage unit and the third connection end of the third bidirectional combination switch.

6. An energy feedback pulse special power supply topology circuit according to claim 2, characterized in that: The third bidirectional combination switch includes a third negative switch and a third positive switch; The second connection terminal of the third negative switch is connected to the first connection terminal of the third positive switch, and the connected connection terminal serves as the first connection terminal of the third bidirectional combination switch and is connected to the second connection terminal of the current source unit; The first connection end of the third negative switch serves as the second connection end of the third bidirectional combination switch and is connected to the first connection end of the negative energy storage unit; The second connection end of the third positive switch serves as the third connection end of the third bidirectional combination switch and is connected to the second connection end of the negative energy storage unit and the third connection end of the second bidirectional combination switch.

7. An energy feedback pulse special power supply topology circuit according to claim 5, characterized in that: The positive energy storage unit includes a positive energy storage capacitor, the first connection end of the positive energy storage capacitor is the first connection end of the positive energy storage unit, and is connected to the first connection end of the second positive switch; the second connection end of the positive energy storage capacitor is the second connection end of the positive energy storage unit, and is connected to the second connection end of the first negative switch.

8. An energy feedback pulse special power supply topology circuit according to claim 6, characterized in that: The negative energy storage unit includes a negative energy storage capacitor, the first connection end of the negative energy storage capacitor is the first connection end of the negative energy storage unit, and is connected to the first connection end of the third negative switch; the second connection end of the negative energy storage capacitor is the second connection end of the negative energy storage unit, and is connected to the second connection end of the second negative unit.

9. An energy feedback pulse special power supply topology circuit according to claim 2, characterized in that: The topology structure further includes: an energy consumption unit, which is used to consume residual energy after the current source unit works.

10. An energy feedback pulse special power supply topology circuit according to claim 3, characterized in that: The energy consumption unit is connected in series between the second connection terminal of the third bidirectional combination switch and the first connection terminal of the negative energy storage unit.

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