External superconducting magnet power supply

Abstract

The utility model relates to the technical field of magnet power supplies, and discloses an external superconducting magnet power supply, which comprises a plurality of power supply modules connected in parallel, the input end of each power supply module is electrically connected with a power grid, the output end of each power supply module is electrically connected with an external superconducting magnet, and the plurality of power supply modules connected in parallel are used for jointly supplying power to the external superconducting magnet; wherein the power supply module comprises a switching power supply sub-module which is electrically connected with a power grid and is used for converting alternating current of a first voltage level input by the power grid into high-frequency alternating current of a third voltage level; and the linear adjusting tube is electrically connected with the switching power supply sub-module and the outer superconducting magnet, and is used for converting the direct current of the third voltage level into direct current of a fourth voltage level and inputting the direct current of the fourth voltage level into the outer superconducting magnet. According to the utility model, through the switching power supply sub-module and the linear adjusting tube, the power factor and the energy utilization rate can be improved, the harmonic wave is small, the power grid is not polluted, and the stability of the output voltage is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to magnet power supply technical field, concretely relates to a kind of outer superconductive magnet power supply. BACKGROUND

[0002] Steady-state high magnetic field experimental device (China's Steady High Magnetic Field Facility, SHMFF for short) is a strong magnetic field extreme experimental condition facility for multidisciplinary experimental research needs, wherein, hybrid magnet is widely used in strong magnetic field extreme experimental condition facility as the magnet capable of generating the highest steady-state magnetic field. Hybrid magnet is a device composed of inner water-cooled magnet and outer superconducting magnet. Its principle is to use the characteristic that the resistance of outer superconducting magnet disappears in low temperature environment, generate a huge magnetic field through powerful current, and combine the cooling system of water-cooled magnet to ensure that the outer superconducting magnet can work in the best state. This combination enables the hybrid magnet to generate extremely high steady-state magnetic field.

[0003] In related technologies, the outer superconducting magnet needs a high-stability power supply, and most power supplies use thyristor rectifiers to adjust the output voltage by controlling the conduction angle. However, the power factor of thyristor rectifiers is low, resulting in low energy utilization rate and larger odd harmonics, which not only pollutes the power grid but also directly causes output voltage distortion. SUMMARY

[0004] Therefore, the utility model provides an outer superconducting magnet power supply to solve the technical problems of low energy utilization rate, power grid pollution and output voltage distortion caused by the use of thyristor rectifiers in related technologies.

[0005] In a first aspect, the utility model embodiment provides an outer superconducting magnet power supply, comprising: a plurality of parallel power supply modules, the input end of each power supply module is electrically connected with the power grid, and the output end of each power supply module is electrically connected with the outer superconducting magnet, and the plurality of parallel power supply modules are used to supply power to the outer superconducting magnet together.

[0006] The power supply module comprises:

[0007] The switching power supply submodule is electrically connected with the power grid and is used to convert the first voltage level alternating current input by the power grid into high-frequency alternating current of the third voltage level.

[0008] The linear regulating tube is electrically connected with the switching power supply submodule and the outer superconducting magnet respectively and is used to convert the third voltage level direct current into fourth voltage level direct current input to the outer superconducting magnet.

[0009] In an optional embodiment, the switching power supply submodule comprises:

[0010] a rectifier bridge, electrically connected with the power grid, for converting the first voltage level AC power input from the power grid into a second voltage level DC power;

[0011] a high frequency inverter, electrically connected with the rectifier bridge, for converting the second voltage level DC power into a second voltage level high frequency AC power;

[0012] a high frequency transformer, electrically connected with the high frequency inverter, for converting the second voltage level high frequency AC power into a third voltage level high frequency AC power;

[0013] a synchronous rectifier tube, electrically connected with the high frequency transformer and the linear regulator tube respectively, for converting the third voltage level high frequency AC power into a third voltage level high frequency DC power input to the linear regulator tube.

[0014] In an alternative embodiment, the power supply module further comprises:

[0015] a control board, electrically connected with the switching power supply sub-module and the linear regulator tube respectively, for performing PI regulation on the output voltage values of the switching power supply sub-module and the linear regulator tube according to given values, so as to make the linear regulator tube output the voltage value required by the outer superconducting magnet.

[0016] In an alternative embodiment, the control board is further configured to adjust the gate voltage of the linear regulator tube according to different excitation stages of the outer superconducting magnet, so as to change the working state of the linear regulator tube.

[0017] In an alternative embodiment, the control board is further electrically connected with the synchronous rectifier tube, and is configured to control the conduction state of the synchronous rectifier tube according to different excitation stages of the outer superconducting magnet.

[0018] In an alternative embodiment, the switching power supply sub-module further comprises:

[0019] an EMI filter unit, electrically connected between the power grid and the rectifier bridge, for suppressing electromagnetic interference generated in the first voltage level AC power input from the power grid;

[0020] an LC filter circuit, electrically connected between the rectifier bridge and the high frequency inverter, for filtering out harmonics in the second voltage level DC power output by the rectifier bridge.

[0021] In an alternative embodiment, the high frequency inverter is an IGBT phase-shifted full-bridge inverter.

[0022] In an alternative embodiment, the linear regulation tube comprises a plurality of linear MOS tubes connected in parallel between the synchronous rectifier tube and the outer superconducting magnet.

[0023] The utility model has the advantages of the following beneficial effects:

[0024] The utility model discloses a switching power supply submodule, which can realize voltage conversion through switching operation of electronic devices, so that the switching power supply has small power consumption in the conversion process, thereby improving the efficiency, and the switching power supply submodule adopts a power factor correction mode, has high power factor and high energy utilization rate.

[0025] In addition, the switching power supply submodule and the linear regulation tube are electrically connected, and when facing rapid response load changes, the linear regulation tube can provide stable output voltage and current, and the switching power supply submodule provides efficient power conversion in light load, and the two are connected in series, so that the response speed of the system can be improved while stability is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0027] Figure 1 It is a structure schematic view of the outer superconducting magnet power supply according to the utility model embodiment;

[0028] Figure 2 It is a structure schematic view of the power supply module according to the utility model embodiment. BRIEF DESCRIPTION OF DRAWINGS

[0030] 100, outer superconducting magnet power supply;200, power supply module;201, switching power supply submodule;2011, rectifier bridge;2012, high-frequency inverter;2013, high-frequency transformer;2014, synchronous rectifier tube;2015, EMI filter unit;2016, LC filter circuit;202, linear regulation tube. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0032] The steady high magnetic field facility (SHMFF) is a strong magnetic field extreme experimental condition facility for multidisciplinary experimental research needs, wherein the hybrid magnet is widely used in the strong magnetic field extreme experimental condition facility as a magnet capable of generating the highest steady magnetic field. The hybrid magnet is a device composed of an inner water-cooled magnet and an outer superconducting magnet. The principle is to use the characteristic that the resistance of the outer superconducting magnet disappears in a low-temperature environment to generate a huge magnetic field through a strong current, and to combine the cooling system of the water-cooled magnet to ensure that the outer superconducting magnet can work in the best state. This combination enables the hybrid magnet to generate an extremely high steady magnetic field.

[0033] In the related art, the outer superconducting magnet requires a high-stability power supply, and most power supplies use thyristor rectifiers to adjust the output voltage by controlling the conduction angle. However, the power factor of the thyristor rectifier is low, resulting in low energy utilization and larger odd harmonics, which not only pollutes the power grid but also directly causes the output voltage to be distorted.

[0034] Therefore, the utility model discloses a switching power supply submodule and a linear regulator tube, which can improve the power factor and energy utilization, and have small harmonics, thereby not only polluting the power grid but also ensuring the stability of the output voltage.

[0035] Figure 1 is a structural schematic view of the outer superconducting magnet power supply according to the embodiments of the utility model, Figure 2 is a structural schematic view of the power supply module according to the embodiments of the utility model (omitting the control board), as Figure 1 and Figure 2 The utility model discloses an outer superconducting magnet power supply 100, which comprises: a plurality of parallel power supply modules 200, the input end of each power supply module 200 is electrically connected with a power grid, the output end of each power supply module 200 is electrically connected with an outer superconducting magnet, and the plurality of parallel power supply modules 200 are used for collectively supplying power to the outer superconducting magnet.

[0036] The power supply module 200 comprises a switching power supply submodule 201 and a linear regulator tube 202.

[0037] Specifically, the switching power supply submodule 201 is electrically connected with the power grid, and the switching power supply submodule 201 is used for converting the alternating current of the first voltage level input by the power grid into high-frequency alternating current of the third voltage level; the linear regulator tube 202 is electrically connected with the switching power supply submodule and the outer superconducting magnet respectively, and the linear regulator tube 202 is used for converting the direct current of the third voltage level into direct current of the fourth voltage level and inputting the direct current of the fourth voltage level to the outer superconducting magnet.

[0038] The utility model discloses a switching power supply submodule can be realized voltage conversion through the switching operation of electronic device, make switching power supply in the conversion process power dissipation is smaller, thereby improved efficiency, and switching power supply submodule adopts power factor correction mode, and power factor is high, and energy utilization rate is high.

[0039] In addition, the utility model discloses that switching power supply submodule is connected with linear regulator tube 202 electricity, when facing the quick response load change, linear regulator tube 202 can provide stable output voltage and electric current, plus switching power supply submodule 201 provides high -efficient electric energy conversion when light load, the series connection of two, can guarantee stability while improving the response speed of system. And, the direct current of switching power supply submodule output will superimpose greater ripple, and linear regulator tube 202 ripple is small, through the series connection use of two, can reduce the ripple and noise of whole to some extent, improve the purity of power supply.

[0040] In some optional embodiments, the switching power supply submodule 201 includes: a rectifier bridge 2011, a high-frequency inverter 2012, a high-frequency transformer 2013, and a synchronous rectifier tube 2014.

[0041] Specifically, the rectifier bridge 2011 is electrically connected with the power grid, and the rectifier bridge 2011 is used for converting the alternating current of the first voltage level input by the power grid into direct current of the second voltage level; the high-frequency inverter 2012 is electrically connected with the rectifier bridge 2011, and the high-frequency inverter 2012 is used for converting the direct current of the second voltage level into high-frequency alternating current of the second voltage level; the high-frequency transformer 2013 is electrically connected with the high-frequency inverter, and the high-frequency transformer 2013 is used for converting the high-frequency alternating current of the second voltage level into high-frequency alternating current of the third voltage level; the synchronous rectifier tube 2014 is electrically connected with the high-frequency transformer 2013 and the linear regulator tube 202 respectively, and the synchronous rectifier tube 2014 is used for converting the high-frequency alternating current of the third voltage level into high-frequency direct current of the third voltage level and inputting the high-frequency direct current of the third voltage level to the linear regulator tube 202.

[0042] The utility model discloses a switching power supply submodule 201 adopts switching device to carry out energy conversion, can realize high -efficient energy conversion, saves energy and reduces heat loss simultaneously, has good load adaptability and stability, can keep output voltage stable under different load conditions, because high -frequency switching circuit is adopted, the volume of switching power supply submodule is relatively small, is suitable in the scene of limited space, such as portable equipment and embedded system etc., through the on and off of control switching device, the input electric energy carries out high -efficient conversion, can convert the grid ac voltage into stable DC voltage, satisfies the demand of various outer superconducting magnet to different voltage and current, has good voltage stabilizing function, can keep the relative stability of output voltage under the condition that input voltage fluctuation or load changes, ensures the reliable operation of equipment.

[0043] In some optional embodiments, the power supply module 200 further comprises a control board.

[0044] The control board is electrically connected with the switching power supply submodule 201 and the linear regulator 202 respectively, and is used for performing PI regulation on the output voltage values of the switching power supply submodule 201 and the linear regulator 202 according to a given value, so as to make the linear regulator 202 output a voltage value required by the outer superconducting magnet.

[0045] The PI regulation adjusts the output voltage value of the linear regulator 202 through two links of proportion (P) and integration (I), so as to make it conform to the given value (set value).

[0046] In some optional embodiments, the control board is further used for adjusting the gate voltage of the linear regulator 202 according to different excitation stages of the outer superconducting magnet, so as to change the working state of the linear regulator.

[0047] Specifically, the control board can make the linear regulator 202 work in an amplification zone or a saturation zone by adjusting the gate voltage of the linear regulator 202. Since the load is the outer superconducting magnet, when the outer superconducting magnet is in an excitation stage and a steady state, the control board adjusts the gate voltage of the linear regulator 202 to be greater than a threshold voltage and greater than the sum of a drain voltage and the threshold voltage, so that the linear regulator 202 enters a saturated conduction state, i.e., the saturation zone, can make the output voltage be in a stable state, and reduce circuit fluctuations caused by parameter changes; when the outer superconducting magnet is in a magnet demagnetization stage, because a large amount of energy is stored in the outer superconducting magnet, the control board adjusts the gate voltage of the linear regulator 202 to be greater than the threshold voltage and less than the sum of the drain voltage and the threshold voltage, so that the linear regulator 202 enters a linear zone, and the output current thereof has a linear relationship with the input voltage, which can allow the energy in the outer superconducting magnet to be slowly discharged.

[0048] In addition, since the outer superconducting magnet power supply is a plurality of parallel power supply modules, each module has a linear adjustment tube and a control board, which further stabilizes the output voltage, and the outer superconducting magnet is magnetized and discharged by high-power energy.

[0049] In some optional embodiments, the control board is also electrically connected with the synchronous rectifier tube 2014, and the control board is used to control the conduction state of the synchronous rectifier tube 2014 according to different excitation stages of the outer superconducting magnet.

[0050] As shown in Figure 2 The synchronous rectifier tube 2014 includes a group of MOS tubes Q3-x and MOS tubes Q5-x, where x is N, and there are N groups in total. Specifically, when the outer superconducting magnet is in the excitation stage and the steady state, the control board controls the synchronous rectifier tube 2014 to be fully conductive, that is, each group of MOS tubes Q3-x and MOS tubes Q5-x is in a conductive state, so that the current can pass quickly; when the outer superconducting magnet is in the magnet demagnetization stage, the control board controls the synchronous rectifier tube 2014 to be alternately conductive, that is, each group of MOS tubes Q3-x and MOS tubes Q5-x is in a conductive state at each moment.

[0051] In some optional embodiments, the switching power supply submodule 201 further includes an EMI filter unit 2015 and an LC filter circuit 2016.

[0052] Specifically, the EMI filter unit 2015 is electrically connected between the power grid and the rectifier bridge 2011, and the EMI filter unit 2015 is used to suppress electromagnetic interference generated in the first voltage level alternating current input by the power grid. The LC filter circuit 2016 is electrically connected between the rectifier bridge 2011 and the high-frequency inverter 2012, and the LC filter circuit 2016 is used to filter out harmonics in the second voltage level direct current output by the rectifier bridge.

[0053] The utility model discloses through EMI filter unit and LC filter circuit, further filter out the noise interference in power supply, improve the stability of output voltage.

[0054] In an optional embodiment, the high-frequency inverter 2012 is an IGBT phase-shifted full-bridge inverter.

[0055] Among them, the switching speed of IGBT is fast, usually between tens of nanoseconds to several microseconds, while the switching speed of the thyristor rectifier in the related art is slow, usually between several microseconds to tens of microseconds, and the IGBT can control the size and direction of the current by changing the gate voltage, realizing bidirectional control and higher flexibility.

[0056] In an optional embodiment, the linear adjustment tube includes a plurality of linear MOS tubes (corresponding Figure 2Q4-1-Q4-x) in parallel between the synchronous rectifier 2014 and the outer superconducting magnet.

[0057] Wherein, the utility model discloses a plurality of linear MOS pipe parallel, can when the load changes or input voltage changes, through the shunt keeps the stability of load voltage, thereby improves the stability and reliability of entire power supply.

[0058] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. An external superconducting magnet power supply, characterized by, The application relates to a power supply system for an outer superconducting magnet. The power supply system comprises: a plurality of parallel power supply modules, each of which is electrically connected with a power grid and each of which is electrically connected with an outer superconducting magnet, and the plurality of parallel power supply modules are used for jointly supplying power to the outer superconducting magnet; wherein the power supply module comprises: a switching power supply sub-module which is electrically connected with the power grid and is used for converting alternating current of a first voltage level input by the power grid into high-frequency alternating current of a third voltage level; 2. The power supply of claim 1, wherein a linear regulating tube which is electrically connected with the switching power supply sub-module and the outer superconducting magnet and is used for converting direct current of the third voltage level into direct current of a fourth voltage level and inputting the direct current of the fourth voltage level into the outer superconducting magnet. The switching power supply sub-module comprises: a rectifier bridge which is electrically connected with the power grid and is used for converting alternating current of the first voltage level input by the power grid into direct current of a second voltage level; a high-frequency inverter which is electrically connected with the rectifier bridge and is used for converting direct current of the second voltage level into high-frequency alternating current of the second voltage level; a high-frequency transformer which is electrically connected with the high-frequency inverter and is used for converting high-frequency alternating current of the second voltage level into high-frequency alternating current of the third voltage level; 3. The power supply of claim 2, wherein a synchronous rectifier tube which is electrically connected with the high-frequency transformer and the linear regulating tube and is used for converting high-frequency alternating current of the third voltage level into high-frequency direct current of the third voltage level and inputting the high-frequency direct current of the third voltage level into the linear regulating tube. The power supply module further comprises:

4. The power supply of claim 3, wherein, a control panel which is electrically connected with the switching power supply sub-module and the linear regulating tube and is used for performing PI regulation on output voltage values of the switching power supply sub-module and the linear regulating tube according to given values so as to make the linear regulating tube output voltage values required by the outer superconducting magnet.

5. The power supply of claim 3, wherein, The control panel is further used for adjusting gate voltage of the linear regulating tube according to different excitation stages of the outer superconducting magnet so as to change the working state of the linear regulating tube.

6. The power supply of claim 2, wherein, The control panel is further electrically connected with the synchronous rectifier tube and is used for controlling the conduction state of the synchronous rectifier tube according to different excitation stages of the outer superconducting magnet. The switching power supply sub-module further comprises: an EMI filter unit which is electrically connected between the power grid and the rectifier bridge and is used for suppressing electromagnetic interference generated in alternating current of the first voltage level input by the power grid; 7. The power supply of claim 2, wherein an LC filter circuit which is electrically connected between the rectifier bridge and the high-frequency inverter and is used for filtering out harmonics in direct current of the second voltage level output by the rectifier bridge.

8. The power supply of claim 2, wherein, The high-frequency inverter is an IGBT phase-shifted full-bridge inverter. The linear regulating tube comprises a plurality of linear MOS tubes which are connected in parallel between the synchronous rectifier tube and the outer superconducting magnet.

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