Pulse power supply

Abstract

The utility model provides a pulse power supply which comprises an even number of pulse power units, every two pulse power units are arranged in a mirror symmetry mode, each pulse power unit comprises a direct current bus capacitor, a power electronic switch device, a follow current circuit, a laminated busbar and a first output copper bar, and the direct current bus capacitors are installed on the laminated busbar; the first end of the electronic power switch device is installed on the positive electrode bar of the laminated busbar, and the second end of the electronic power switch device is connected with the first output copper bar. The follow current circuit is installed close to the power electronic switching device and is connected between the negative electrode bar of the laminated busbar and the second end of the power electronic switching device, and the first output copper bar and the negative electrode bar of the laminated busbar are respectively connected with a load through a conductor. The length of the line between the power electronic switching device and the follow current circuit is greatly reduced, so that the parasitic inductance generated by the line is greatly reduced, and the peak voltage is further reduced.

Description

Technical Field

[0001] This application relates to the field of controlled nuclear fusion technology, specifically to a pulsed power supply. Background Technology

[0002] Pulsed power supplies often use power electronic switching devices as the main switch to supply power to the load. When these power electronic switching devices are turned off, the parasitic inductance of the turn-off circuit must be considered. This parasitic inductance generates a large turn-off spike voltage across the power electronic switching device, which may damage it. Therefore, existing technologies (such as photovoltaic inverters and UPS systems) aim to minimize the parasitic inductance of the power electronic switching device's turn-off circuit to ensure its safe and reliable operation.

[0003] Similarly, in the pulsed power supply of the magnet coil in a controlled nuclear fusion device, a large voltage spike is generated between the load and the power electronic switching device when the power electronic switching device is turned off due to the large parasitic inductance. In some cases, this can lead to damage to the power electronic switching device. Therefore, in order to protect the pulsed power supply of the magnet coil, the existing methods of reducing the parasitic inductance of the power electronic switching device's turn-off circuit cannot solve the problem of excessively high turn-off voltage spikes. Even if the parasitic inductance of the power electronic switching device's turn-off circuit is made very small, the phenomenon of excessively high turn-off voltage spikes and damage to the power electronic switching device can still occur.

[0004] Therefore, improving the safety of power electronic switching devices in the pulse power supply of the magnet coil in a controlled nuclear fusion device has become an urgent technical problem to be solved. Utility Model Content

[0005] This application provides a pulsed power supply that at least solves the technical problem in the related art of how to improve the safety of power electronic switching devices in the pulsed power supply of the magnet coil in a controlled nuclear fusion device.

[0006] This application provides a pulsed power supply, comprising: an even number of pulsed power units, with each pair of pulsed power units arranged in a mirror-symmetrical configuration. Each pulsed power unit includes: a DC bus capacitor, a power electronic switching device, a freewheeling circuit, a multilayer busbar, and a first output copper busbar. The DC bus capacitor is mounted on the multilayer busbar. The first terminal of the power electronic switching device is mounted on the positive terminal of the multilayer busbar, and the second terminal of the power electronic switching device is connected to the first output copper busbar. The freewheeling circuit is mounted close to the power electronic switching device and connected between the negative terminal of the multilayer busbar and the second terminal of the power electronic switching device. The first output copper busbar and the negative terminal of the multilayer busbar are respectively connected to a load via conductors.

[0007] In one embodiment, the freewheeling circuit and the power electronic switching device are spatially opposite each other.

[0008] In one embodiment, the freewheeling circuit is mounted on the side facing the negative terminal of the stacked busbar, and the power electronic switching device is mounted on the side facing the positive terminal of the stacked busbar.

[0009] In one embodiment, the freewheeling circuit includes at least one freewheeling resistor and at least one freewheeling diode, wherein the freewheeling resistor is connected in series with the freewheeling diode.

[0010] In one embodiment, the freewheeling resistor is mounted on the resistor support copper busbar, the freewheeling diode is mounted on the diode support copper busbar, and the resistor support copper busbar and the diode support copper busbar are sequentially mounted between the first output copper busbar and the stacked busbar.

[0011] In one embodiment, the resistor support copper busbar and the diode support copper busbar are arranged perpendicular to the stacked busbar.

[0012] In one embodiment, the freewheeling resistor is crimped between the resistor support copper busbar and the diode support copper busbar, and the freewheeling diode is crimped onto the diode support copper busbar.

[0013] In one embodiment, the resistor support copper busbar, the freewheeling resistor, the diode support copper busbar, and the freewheeling diode are stacked and pressed together by a pressing device.

[0014] In one embodiment, a first input copper busbar is further connected to the positive terminal of the stacked busbar, and a second input copper busbar is further connected to the negative terminal of the stacked busbar.

[0015] In one embodiment, a second output copper busbar is also connected to the negative terminal of the stacked busbar, and the first output copper busbar and the second output copper busbar are connected to the load.

[0016] This application has at least the following beneficial effects:

[0017] The pulse power supply in this application includes an even number of pulse power units, and every two pulse power units are arranged in a mirror symmetrical manner. The mirror arrangement of the pulse power units can ensure the static and dynamic current sharing performance of each power electronic switching device when multiple pulse power units constitute a pulse power supply. Meanwhile, in each pulse power unit, the first terminal of the power electronic switch is connected to the positive terminal of the laminated busbar, and the second terminal of the power electronic switch is connected to the first output copper busbar. The freewheeling circuit is installed close to the power electronic switch and connected between the negative terminal of the laminated busbar and the second terminal of the power electronic switch, which greatly reduces the line length between the power electronic switch and the freewheeling circuit, thereby greatly reducing the parasitic inductance generated by this part of the line. In addition, since the load is a magnetic coil with high inductance, the current in the line between the freewheeling circuit and the load remains unchanged or changes only slightly when the power electronic switch is turned off. Therefore, by setting the freewheeling circuit close to the power electronic switch and away from the load, the parasitic inductance generated in the line between the freewheeling circuit and the load is very small or even zero. Therefore, the generated spike pulse is small or even zero, effectively protecting the power electronic switch. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the circuit principle of an exemplary pulse power unit according to an embodiment of this application;

[0021] Figure 2 This is a schematic structural diagram of an exemplary pulse power unit according to an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of an exemplary pulse power unit according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of a mirror-symmetric structure of an exemplary pulse power supply according to an embodiment of this application;

[0024] Figure 5This is a schematic diagram of an exemplary pulse power supply structure having multiple pairs of mirror-symmetric pulse power units, according to an embodiment of this application. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, including a series of units, systems, products, or devices is not necessarily limited to those explicitly listed, but may include units, systems, products, or devices not explicitly listed.

[0027] Referring to the description in the background art, even after reducing the peak voltage of power electronic switching devices by using existing techniques to reduce the parasitic inductance of the power electronic switching device's turn-off circuit in the pulse power supply of the magnet coil, damage to the power electronic switching devices still occurs. To address this issue, the applicant's research revealed that existing methods for reducing parasitic inductance are often applied to power electronic devices such as uninterruptible power supplies (UPS) and photovoltaic inverters. While both the pulse power supply of the magnet coil and the aforementioned power electronic devices reduce the parasitic inductance of the power electronic switching device's turn-off circuit, they do not consider the parasitic inductance between the power electronic switching device and the load. This parasitic inductance between the power electronic switching device and the load has almost no effect on the aforementioned power electronic devices, but it has a significant impact on the pulse power supply of the magnet coil. Research has found that damage to the pulse power supply of the magnet coil is often caused by the parasitic inductance between the power electronic switching device and the load. The reason is:

[0028] In uninterruptible power supplies (UPS), photovoltaic inverters, and other similar devices, power electronic switching devices do not require a separate freewheeling circuit between the device and the load. If freewheeling is needed, the freewheeling diode integrated within the power electronic switching device is often used. At the instant the power electronic switching device is turned off, the current in the freewheeling loop between the load and the freewheeling diode remains almost constant. Therefore, the self-induced voltage generated by the parasitic inductance between the load and the freewheeling diode (power electronic switching device) at the instant the power electronic switching device is turned off is negligible. However, in the field of controlled nuclear fusion, pulsed power supplies power magnet coils. After discharging the magnet coil, the electrical energy within it needs to be released. In controlled nuclear fusion, the current drop rate of the magnet coil during energy release must be sufficiently high to generate a sufficient voltage across the coil to break down the plasma. Therefore, if… Figure 1 As shown, an additional freewheeling circuit needs to be connected in parallel across the load to provide freewheeling current to the magnet coil, in order to maximize the rate of current descent in the magnet coil. At the instant the power electronic switching device turns off, the line between the load and the freewheeling circuit (i.e.,...) Figure 1 The current in line B) remains almost constant, and the parasitic inductance in this line can be ignored. However, the current in the line between the freewheeling circuit and the power electronic switching device (i.e., Figure 1 The current changes extremely rapidly in line A). Furthermore, in existing technologies, to facilitate the installation of the freewheeling circuit, it is often installed near the magnet coil. However, the physical distance between the pulse power supply and the magnet coil is considerable (potentially tens of meters), leading to a significant increase in the distance between the freewheeling circuit and the power electronic switching device (i.e.,...). Figure 1 Line A) is relatively long. At the moment the power electronic switching device is turned off, the parasitic inductance on the line between the freewheeling circuit and the power electronic switching device is large, possibly reaching the microhenry level. This causes the power electronic switching device to generate a very large spike pulse at the moment of turn-off, which may damage the power electronic switching device.

[0029] Based on this, this application provides a pulsed power supply, such as... Figures 2 to 5 As shown, it includes an even number of pulse power units 100, with every two pulse power units 100 arranged in a mirror image; wherein, as Figure 3As shown, each pulse power unit 100 includes: a DC bus capacitor 10, a power electronic switching device 20, a freewheeling circuit 50, a multilayer busbar 30, and a first output copper busbar 41. The DC bus capacitor 10 is mounted on the multilayer busbar 30. The first terminal 21 of the power electronic switching device 20 is mounted on the positive terminal 31 of the multilayer busbar 30 and connected to it. The second terminal 22 of the power electronic switching device 20 is connected to the first output copper busbar 41. The freewheeling circuit 50 is mounted close to the power electronic switching device 20 and connected between the negative terminal 32 of the multilayer busbar 30 and the second terminal 22 of the power electronic switching device 20. The first output copper busbar 41 and the negative terminal 32 of the multilayer busbar 30 are respectively connected to the load through conductors.

[0030] In this embodiment, at least one pair of mirror-arranged pulse power units 100 constitute a pulse power supply, which can ensure the static and dynamic current sharing performance of each power electronic switching device 20 when multiple pulse power units 100 constitute a pulse power supply. Simultaneously, the first terminal 21 of the power electronic switching device 20 in each pulse power unit 100 is connected to the positive terminal 31 of the stacked busbar 30, and the second terminal 22 of the power electronic switching device 20 is connected to the first output copper busbar 41. The freewheeling circuit 50 is installed close to the power electronic switching device 20 and connected between the negative terminal 32 of the stacked busbar 30 and the second terminal 22 of the power electronic switching device 20, greatly reducing the line length between the power electronic switching device 20 and the freewheeling circuit 50, thereby greatly reducing the parasitic inductance generated by this part of the line. Furthermore, since the load is a magnetic coil with high inductance, at the instant the power electronic switching device 20 is turned off, the line between the freewheeling circuit 50 and the load (e.g., Figure 1 The current on line B) shown remains constant or changes only slightly. Therefore, by positioning the freewheeling circuit 50 close to the power electronic switching device 20 and away from the load, the parasitic inductance generated on the line between the freewheeling circuit 50 and the load is very small or even zero. As a result, the generated spike pulses are small or even zero, effectively protecting the power electronic switching device 20.

[0031] In one embodiment, the positive electrode array 31 and the negative electrode array 32 are stacked. The currents in the stacked positive electrode array 31 and negative electrode array 32 are of the same magnitude but opposite in direction, thus canceling out the magnetic field generated by the current, effectively reducing parasitic inductance, and effectively reducing the peak voltage between the DC bus capacitor 10 and the power electronic switching device 20 when the power electronic switching device 20 is turned off.

[0032] In one embodiment, the freewheeling circuit 50 and the power electronic switching device 20 are spatially opposite to each other. The line between the second terminal 22 of the power electronic switching device 20 and the freewheeling circuit 50 forms a relative stack with the freewheeling circuit 50. At the instant the power electronic switching device 20 is turned off, the line between the second terminal 22 of the power electronic switching device 20 and the freewheeling circuit 50 ( Figure 1 and Figure 2 The current on line A shown in the diagram ( Figure 2 Although the current Ia shown drops rapidly, it is still related to the current in the freewheeling circuit 50. Figure 2 The direction of the current Ib shown is opposite. The parasitic inductance generated by the current in the freewheeling circuit 50 is partially offset by the current in the line between the second terminal 22 of the power electronic switching device 20 and the freewheeling circuit 50. This can further reduce the parasitic inductance in this line and thus reduce the spike pulse when the power electronic switching device 20 is turned off.

[0033] In one embodiment, the freewheeling circuit 50 is installed on the side facing the negative terminal 32 of the stacked busbar 30, and the power electronic switching device 20 is installed on the side facing the positive terminal 31 of the stacked busbar 30. The positive terminal 31 and the negative terminal 32 are stacked to form the stacked busbar 30, and the DC bus capacitor 10 is installed on the stacked busbar 30. The power electronic switching device 20 and a first output copper busbar 41 are sequentially arranged at one end of the stacked busbar 30, and the power electronic switching device 20 is installed on the positive terminal 31, facing away from the negative terminal 32. There is a mounting space between the first output copper busbar 41 and the negative terminal 32 for installing the freewheeling circuit 50, which is installed within this space. The freewheeling circuit 50 is installed on the side of the power electronic switching device 20 facing the negative terminal 32.

[0034] In one embodiment, the freewheeling circuit 50 includes at least one freewheeling resistor 51 and at least one freewheeling diode 52, wherein the freewheeling resistor 51 and the freewheeling diode 52 are connected in series, the freewheeling resistor 51 is mounted on a resistor support copper busbar 53, and the freewheeling diode 52 is mounted on a diode support copper busbar 54. The resistor support copper busbar 53 and the diode support copper busbar 54 are sequentially installed between the first output copper busbar 41 and the negative terminal busbar 32, with one of the resistor support copper busbar 53 and the diode support copper busbar 54 connected to the first output copper busbar 41 and the other connected to the negative terminal busbar 32.

[0035] In one embodiment, the resistor support copper busbar 53 and the diode support copper busbar 54 are arranged perpendicular to the stacked busbar 30. The resistor support copper busbar 53 and the diode support copper busbar 54 are often sheet-like structures. To reduce the length of the freewheeling circuit 50, the resistor support copper busbar 53 and the diode support copper busbar 54 are arranged perpendicular to the stacked busbar 30. The length of the freewheeling circuit 50 is then the sum of the lengths of the freewheeling resistor 51 and the freewheeling diode 52, as well as the thicknesses of the resistor support copper busbar 53 and the diode support copper busbar 54. This significantly shortens the length of the freewheeling circuit 50, resulting in very small voltage spikes during the freewheeling phase.

[0036] In one embodiment, the freewheeling resistor 51 can be pressed onto the resistor support copper busbar 53, and the freewheeling diode 52 can be pressed onto the diode support copper busbar 54. The resistor support copper busbar 53, the freewheeling resistor 51, the diode support copper busbar 54, and the freewheeling diode 52 are stacked and pressed together by a pressing device and fixedly connected between the stacked busbar 30 and the first output copper busbar 41.

[0037] In one embodiment, a first input copper busbar is further connected to the positive terminal 31, and a second input copper busbar is further connected to the negative terminal 32. A second output copper busbar 42 is also connected to the negative terminal 32, and the first output copper busbar 41 and the second output copper busbar 42 are connected to the load.

[0038] In one embodiment, the number of series / parallel pulse power units 100 can be determined based on actual voltage and current output requirements. In this embodiment, there can be multiple pairs of mirror-symmetrical pulse power units. Multiple pairs of pulse power units can be fixedly mounted together using a mounting bracket.

[0039] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0040] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A pulsed power supply, characterized by, include: An even number of pulse power units, with every two pulse power units arranged in a mirror-symmetrical configuration, each pulse power unit comprising: DC bus capacitors, power electronic switching devices, freewheeling circuits, and laminated busbars and first output copper busbars, among which, The DC bus capacitor is mounted on the laminated busbar; the first terminal of the power electronic switch is mounted on the positive terminal of the laminated busbar, and the second terminal of the power electronic switch is connected to the first output copper busbar. The freewheeling circuit is installed close to the power electronic switching device and is connected between the negative terminal of the stacked busbar and the second terminal of the power electronic switching device. The first output copper busbar and the negative terminal of the stacked busbar are respectively connected to the load through conductors.

2. The pulsed power supply of claim 1, wherein, The freewheeling circuit and the power electronic switching device are spatially opposite to each other.

3. The pulsed power supply of claim 2, wherein, The freewheeling circuit is installed on the side facing the negative terminal of the stacked busbar, and the power electronic switching device is installed on the side facing the positive terminal of the stacked busbar.

4. The pulsed power supply of claim 1, wherein, The freewheeling circuit includes at least one freewheeling resistor and at least one freewheeling diode, wherein the freewheeling resistor and the freewheeling diode are connected in series.

5. The pulsed power supply of claim 4, wherein, The freewheeling resistor is mounted on the resistor support copper busbar, and the freewheeling diode is mounted on the diode support copper busbar. The resistor support copper busbar and the diode support copper busbar are sequentially installed between the first output copper busbar and the stacked busbar.

6. The pulsed power supply of claim 5, wherein, The resistor support copper busbar and the diode support copper busbar are arranged perpendicular to the stacked busbar.

7. A pulse power supply as claimed in claim 5 or 6, characterized in that, The freewheeling resistor is pressed between the resistor support copper busbar and the diode support copper busbar, and the freewheeling diode is pressed between the diode support copper busbar.

8. The pulsed power supply of claim 7, wherein, The resistor support copper busbar, the freewheeling resistor, the diode support copper busbar, and the freewheeling diode are stacked and pressed together by a pressing device.

9. The pulsed power supply of claim 1, wherein, The positive terminal of the stacked busbar is also connected to a first input copper busbar, and the negative terminal of the stacked busbar is also connected to a second input copper busbar.

10. The pulsed power supply of claim 1, wherein, A second output copper busbar is also connected to the negative terminal of the stacked busbar, and the first output copper busbar and the second output copper busbar are connected to the load.

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