An integrated transformer power supply system for a multiphase plasma generating device

Abstract

This invention proposes an integrated transformer power supply system for a multiphase plasma generator, relating to the field of power supplies for high-power multiphase plasma generators. The system comprises a voltage and frequency control unit, an integrated transformer unit, and a plasma generator, all connected in sequence. By varying the wiring arrangement of the integrated transformer unit, a multiphase output power supply can be obtained to accommodate the varying frequency, voltage, voltage phase, and steep drop characteristics requirements of various multiphase plasma generators. This system offers high flexibility and wide applicability, achieving the necessary engineering requirements for high efficiency, durability, and easy maintenance.

Description

Technical Field

[0001] The present invention relates to the field of power supplies for high-power multiphase plasma generators, and in particular to an integrated transformer power supply system for a multiphase plasma generating device. Background Art

[0002] Thermal plasma, as a highly efficient energy source, has been widely applied in various fields. Due to its unique capabilities, such as high temperature, high enthalpy, enhanced reaction kinetics, and rapid reaction to form chemically non-equilibrium materials, as well as its ability to tailor the oxidizing or reducing atmosphere of chemical reactions to meet specific needs, thermal plasma has recently attracted significant attention.

[0003] The AC arc generated by an AC power supply is a type of thermal plasma. Its high energy efficiency stems primarily from the elimination of the AC-to-DC conversion step. However, existing single-phase or three-phase AC arcs exhibit intermittent discharge during polarity reversal and suffer from a relatively small discharge volume, limiting the further development of thermal plasmas. Consequently, multiphase AC arcs have been introduced. Generated between four, six, or even twelve or more electrodes, multiphase AC arcs offer high energy efficiency, a large plasma volume, and low gas flow rates. They are applicable to a wide range of fields, including graphene manufacturing, alkali-free glass microbead production, organic wastewater treatment, gas heating, and waste gas treatment. They are also widely used in thermal power generation, cement and building materials, chemicals, metallurgy, and mining.

[0004] As the core system in a plasma generator, a multiphase plasma integrated transformer power supply must ensure high efficiency, durability, and easy maintenance. However, existing multiphase plasma integrated transformer power supply systems require individual designs tailored to the specific needs of different multiphase plasma generators. For example, the output multiphase power supply is often 3-phase, 6-phase, 12-phase, or 24-phase, requiring a redesign for multiphase plasma generators requiring 9-phase, 15-phase, or similar phases. This results in a low overall system flexibility and prevents widespread application across different multiphase plasma generators. Summary of the Invention

[0005] The object of the present invention is to provide an integrated transformer power supply system for a multiphase plasma generator, which can obtain multiphase power supplies with different needs by changing the wiring method of the integrated transformer unit, thereby achieving the necessary conditions for practical engineering of high efficiency, durability, and easy maintenance.

[0006] The embodiment of the present invention is achieved as follows:

[0007] The present invention provides an integrated transformer power supply system for a multiphase plasma generating device, comprising a voltage and frequency control unit, an integrated transformer unit, and a plasma generator connected in sequence. The input end of the voltage and frequency control unit is used to connect to an external AC power supply. The plasma generator is used to generate multiphase plasma using the multiphase voltage output by the integrated transformer unit.

[0008] The integrated transformer unit comprises at least one set of main transformers. The primary side of the main transformer is connected in star shape and is connected to the voltage and frequency control unit. The secondary side of the main transformer is connected to the plasma generator.

[0009] In some embodiments of the present invention, the voltage and frequency control unit includes a voltage regulating circuit and an auxiliary transformer, wherein the input end of the voltage regulating circuit is used to be connected to an external AC power source, and the output end is connected to the primary side of the main transformer;

[0010] One end of the primary side of the auxiliary transformer is connected to the star point of the primary side of the main transformer, the other end of the primary side of the auxiliary transformer is grounded, one end of the secondary side of the auxiliary transformer is connected to the secondary side of the main transformer, and the other end of the secondary side of the auxiliary transformer is connected to the ignition electrode of the plasma generator and grounded.

[0011] In some embodiments of the present invention, both ends of the secondary side of the main transformer are respectively connected to the electrodes of the plasma generator, the midpoint tap of the secondary side of the main transformer is connected to one end of the secondary side of the auxiliary transformer, and the other end of the secondary side of the auxiliary transformer is connected to the ignition electrode of the plasma generator and grounded.

[0012] In some embodiments of the present invention, the output frequency of the auxiliary transformer is 2-4 times the output frequency of the main transformer.

[0013] In some embodiments of the present invention, the above-mentioned integrated transformer unit includes a first group of main transformers and a second group of main transformers, the primary side of the first group of main transformers adopts a star connection, the primary side of the second group of main transformers adopts a delta connection, and the secondary sides of the first group of main transformers and the second group of main transformers are connected to the plasma generator.

[0014] In some embodiments of the present invention, one end of the secondary side of the first group of main transformers and the second group of main transformers is connected to the electrode of the plasma generator, and the other end is grounded.

[0015] In some embodiments of the present invention, both ends of the secondary sides of the first and second main transformers are respectively connected to electrodes of the plasma generator, and the midpoint taps of the secondary sides of the first and second main transformers are grounded.

[0016] In some embodiments of the present invention, the number of turns of the primary side coil of the second set of main transformers is twice the number of turns of the primary side coil of the first set of main transformers. times.

[0017] In some embodiments of the present invention, n groups of main transformers with extended triangle connection on the primary side are further included, where n is an integer greater than or equal to 1.

[0018] In some embodiments of the present invention, the voltage and frequency regulating unit is a three-phase inverter.

[0019] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0020] An embodiment of the present invention provides an integrated transformer power supply system for a multiphase plasma generator, comprising a voltage and frequency control unit, an integrated transformer unit, and a plasma generator connected in sequence. The voltage and frequency control unit can be composed of a voltage regulator circuit and an auxiliary transformer, or a three-phase frequency converter, while the integrated transformer unit includes at least one main transformer with a star-connected primary side. When the auxiliary transformer uses a frequency tripler, its frequency is three times that of the main transformer. The high voltage output from the secondary side of the auxiliary transformer is superimposed with the voltage output of each single-phase transformer in any group of main transformers, and then serves as the multiphase power input for the plasma generator to prevent arc extinction caused by power supply zero crossing during AC arc generation, which affects stability. In this case, multiple groups of main transformers and auxiliary transformers form an n+1-phase integrated transformer power supply (n is a multiple of 3), capable of outputting multiphase power to meet different needs.

[0021] In addition, when the voltage and frequency control unit directly uses a three-phase inverter, its output end can be directly connected to the primary side of multiple groups of main transformers. By changing the connection method of the primary side of each group of main transformers, such as star connection, triangle connection, and extended triangle connection, different phase numbers with different phase differences can be obtained on the secondary side, and thus an integrated transformer power supply for a plasma generator with more than 9 phases, such as 12, 15, 18, 24... (phases that are multiples of 3) can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of an embodiment of an integrated transformer power supply system for a multiphase plasma generating device provided by the present invention;

[0024] Figure 2 A schematic structural diagram of another embodiment of an integrated transformer power supply system for a multiphase plasma generating device provided by the present invention;

[0025] Figure 3 A schematic diagram of the electrode arrangement of a plasma generator in one embodiment of an integrated transformer power supply system for a multiphase plasma generating device provided by the present invention;

[0026] Figure 4 A schematic structural diagram of an integrated transformer unit in one embodiment of an integrated transformer power supply system for a multiphase plasma generating device provided by the present invention;

[0027] Figure 5 This is a structural schematic diagram of an integrated transformer unit in another embodiment of an integrated transformer power supply system for a multiphase plasma generating device provided by the present invention.

[0028] Icons: 1. Voltage and frequency control unit; 2. Integrated transformer unit; 21. First set of main transformers; 22. Second set of main transformers; 3. Plasma generator; 31. Plasma generator housing; 32. Electrode; 33. Ignition electrode. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0031] Example

[0032] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features thereof may be combined with each other.

[0033] Please refer to Figure 1An embodiment of the present invention provides an integrated transformer power supply system for a multiphase plasma generating device, comprising a voltage and frequency control unit 1, an integrated transformer unit 2, and a plasma generator 3 connected in sequence. The input end of the voltage and frequency control unit 1 is used to connect to an external AC power supply. The plasma generator 3 is used to generate a multiphase plasma using the multiphase voltage output by the integrated transformer unit 2.

[0034] The integrated transformer unit 2 includes at least one set of main transformers. The primary side of the main transformer is connected in star connection and is connected to the voltage and frequency control unit 1 , and the secondary side of the main transformer is connected to the plasma generator 3 .

[0035] Furthermore, the voltage and frequency control unit 1 includes a voltage regulating circuit and an auxiliary transformer, wherein the input end of the voltage regulating circuit is used to connect to an external AC power source, and the output end is connected to the primary side of the main transformer;

[0036] One end of the primary side of the auxiliary transformer is connected to the star point of the primary side of the main transformer, the other end of the primary side of the auxiliary transformer is grounded, one end of the secondary side of the auxiliary transformer is connected to the secondary side of the main transformer, and the other end of the secondary side of the auxiliary transformer is connected to the ignition electrode 33 of the plasma generator 3 and grounded.

[0037] In the technical solution provided in this embodiment, a set of main transformers is composed of three single-phase transformers of identical specifications. For example, when the integrated transformer unit 2 includes a set of main transformers, the three single-phase transformers are single-phase transformer T1, single-phase transformer T2, and single-phase transformer T3. Their primary sides are connected in a star configuration and are connected to the voltage regulation circuit. Their secondary sides are used to output multi-phase power and are connected to the electrodes 32 of the plasma generator 3, thereby providing the plasma generator 3 with multi-phase power to generate an AC arc. However, during the discharge process of AC current, the current may cross zero twice within one cycle, which can cause unstable discharge and lead to "arc extinction." Therefore, an auxiliary transformer T4 can be used to mitigate this problem. Specifically, one end of the primary side of the auxiliary transformer T4 is connected to the star point of the primary side of the main transformer, and the other end is grounded. One end of the secondary side of the auxiliary transformer T4 is connected to the secondary sides of the single-phase transformers T1, T2, and T3, respectively, and the other end is connected to the ignition electrode 33 of the plasma generator 3 and grounded. The other ends of the secondary sides of the single-phase transformers T1, T2, and T3 serve as a three-phase power supply output to the plasma generator 3. In this case, the frequency of the auxiliary transformer T4 can be 2-4 times, and optimally 3 times, the frequency of the single-phase transformers T1, T2, and T3, respectively. There is a phase difference between the two, so that the high voltage output of its secondary side can be superimposed with the voltage output of any single-phase transformer and then used as the multi-phase power input of the plasma generator 3 to achieve the purpose of stable AC arc generation. In other words, the auxiliary transformer T4 effectively serves as an arc starter. Overall, single-phase transformers T1, T2, and T3, along with auxiliary transformer T4, form a "3+1 phase" self-ignition integrated transformer power supply, capable of outputting three-phase power. Furthermore, by increasing the number of main transformer groups, multi-phase outputs, such as 9-phase and 12-phase, can be achieved.

[0038] For example, the entire system can be powered by an external three-phase AC power source with a phase voltage of 220-2500V and a frequency of 50-5000Hz. The system's no-load output phase voltage can be 200V-120kV, and its loaded output phase voltage can be 50V-20kV. Furthermore, auxiliary transformer T4 can be a small single-phase transformer with steep dropout characteristics. Its capacity only needs to account for 10% of the total system capacity, and its primary voltage is 0.3 times the mains voltage of the main transformer.

[0039] Please refer to Figure 2 and Figure 3In some embodiments of the present invention, both ends of the secondary side of the main transformer are respectively connected to the electrodes 32 of the plasma generator 3, the midpoint tap of the secondary side of the main transformer is connected to one end of the secondary side of the auxiliary transformer, and the other end of the secondary side of the auxiliary transformer is connected to the ignition electrode 33 of the plasma generator 3 and grounded.

[0040] In the technical solution provided in this embodiment, one end of the secondary side of auxiliary transformer T4 is connected to the midpoint taps of single-phase transformers T1, T2, and T3, respectively, and the other end is connected to the ignition electrode 33 of plasma generator 3 and grounded. The ignition electrode 33 and plasma generator housing 31 are also connected together. At this point, both ends of single-phase transformers T1, T2, and T3 are connected to the electrode 32 of plasma generator 3, providing a six-phase power supply to plasma generator 3 for stable AC arc generation. Overall, single-phase transformers T1, T2, and T3, along with auxiliary transformer T4, can be considered to form a "6+1 phase" self-ignition integrated transformer power supply, capable of outputting six-phase power. Furthermore, by increasing the number of main transformer groups, multi-phase output, such as 12-phase or 24-phase, can be achieved.

[0041] Please refer to Figure 4 In some embodiments of the present invention, the voltage and frequency control unit 1 may directly adopt a three-phase frequency converter, and the integrated transformer unit 2 includes a first set of main transformers 21 and a second set of main transformers 22. The primary side of the first set of main transformers 21 adopts a star connection, and the primary side of the second set of main transformers 22 adopts a delta connection. The secondary sides of the first set of main transformers 21 and the second set of main transformers 22 are connected to the plasma generator 3.

[0042] Furthermore, one end of the secondary side of the first set of main transformers 21 and the second set of main transformers 22 is connected to the electrode 32 of the plasma generator 3 , and the other end is grounded.

[0043] In the technical solution provided in this embodiment, the voltage and frequency control unit 1 can directly utilize a three-phase inverter, which provides basic power to the integrated transformer unit 2, for example, three-phase AC power with an output phase voltage of 380V and a frequency of 3000Hz. For example, the integrated transformer unit 2 includes a first set of main transformers 21 and a second set of main transformers 22, totaling six single-phase transformers. The secondary side has a total of 12 terminals, designated 1-12. The primary side of the first set of main transformers 21 utilizes a star connection, while the primary side of the second set of main transformers 22 utilizes a delta connection. Secondary terminals 2, 4, 6, 8, 10, and 12 are short-circuited and grounded, and terminals 1, 3, 5, 7, 9, and 11 are connected as six-phase outputs to the electrodes 32 of the plasma generator 3 to generate a six-phase AC arc.

[0044] Please refer to Figure 5 In some embodiments of the present invention, both ends of the secondary sides of the first group of main transformers 21 and the second group of main transformers 22 are respectively connected to the electrodes 32 of the plasma generator 3, and the midpoint taps of the secondary sides of the first group of main transformers 21 and the second group of main transformers 22 are grounded.

[0045] In the technical solution provided in this embodiment, first, the primary side of the first group of main transformers 21 still adopts a star connection, and the primary side of the second group of main transformers 22 still adopts a delta connection. Then, by short-circuiting the midpoint taps of the six single-phase transformers and grounding them, terminals 1-12 are used as 12-phase outputs and connected to the electrodes 32 of the plasma generator 3 to generate a 12-phase AC arc.

[0046] In some embodiments of the present invention, the number of turns of the primary side coil of the second set of main transformers 22 is twice the number of turns of the primary side coil of the first set of main transformers 21. times.

[0047] In the technical solution provided in this embodiment, when the integrated transformer unit 2 includes two sets of main transformers, in order to avoid circulating current between the single-phase transformers and reduce efficiency, the number of turns of the primary side coil of the second set of main transformers 22 with a delta connection on the primary side can be set to be twice the number of turns of the primary side coil of the first set of main transformers 21 with a star connection on the primary side. times.

[0048] In some embodiments of the present invention, a main transformer adopts a Yanbian triangle connection on the primary side of the group, wherein n is an integer greater than or equal to 1.

[0049] Please refer to Figure 4 and Figure 5Two sets of main transformers (the first set of main transformers 21 uses a star connection on its primary side, and the second set of main transformers 22 uses a delta connection on its primary side) can already output 6-phase and 12-phase power. Adding another set of main transformers can produce a 9-phase high-voltage, medium-frequency output power supply. The primary side of this additional set of main transformers can adopt an extended delta connection to produce 9-phase output power with different phase differences on the secondary side. Furthermore, by adding n sets of main transformers with extended delta connections on their primary sides, multi-phase output power can be obtained on the secondary side, for example, 12, 15, 18, 24, etc. (phases in multiples of 3), to accommodate the different frequency, voltage, voltage phase, and steep drop characteristics requirements of different multi-phase plasma generators. By simply changing the wiring configuration, a multi-phase power supply can be obtained, offering high flexibility and wide applicability. Furthermore, each phase has a different phase difference: when one phase crosses zero, the other five phases do not. This means that each phase alternates through zero, ensuring arc continuity and stability.

[0050] In summary, the embodiment of the present application provides an integrated transformer power supply system for a multi-phase plasma generator, comprising a voltage and frequency control unit 1, an integrated transformer unit 2 and a plasma generator 3 connected in sequence, wherein the voltage and frequency control unit 1 can be composed of a voltage regulating circuit + an auxiliary transformer, or can be composed of a three-phase frequency converter, and the integrated transformer unit 2 includes at least one set of main transformers with a star connection on the primary side. When the auxiliary transformer adopts a tripler, its frequency is three times that of the main transformer. The high voltage output from the secondary side of the auxiliary transformer is used to superimpose the voltage output by each single-phase transformer in any group of main transformers, and then serves as the multi-phase power supply input of the plasma generator 3 to prevent arc extinguishing due to the power supply crossing the zero point during the generation of the AC arc, affecting stability. At this time, multiple groups of main transformers and auxiliary transformers constitute an n+1 phase integrated transformer power supply (n is a multiple of 3), which can output multi-phase power supplies with different needs.

[0051] In addition, when the voltage and frequency control unit 1 directly uses a three-phase inverter, its output end can be directly connected to the primary side of multiple groups of main transformers. By changing the connection method of the primary side of each group of main transformers, such as star connection, triangle connection, and extended triangle connection, different phase numbers with different phase differences can be obtained on the secondary side, and thus an integrated transformer power supply for the plasma generator 3 with more than 9 phases, such as 12, 15, 18, 24... (multiples of 3 phases) can be obtained.

[0052] Overall, this system consists of a basic power supply combined with multiple single-phase transformers. By integrating modular transformers and adopting various wiring methods, we can achieve multi-phase power supply for different needs, successfully achieving the necessary conditions for practical engineering with high efficiency, durability, and easy maintenance.

[0053] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

[0054] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present application is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An integrated transformer power supply system for a multiphase plasma generating device, characterized in that: It comprises a voltage and frequency control unit, an integrated transformer unit and a plasma generator connected in sequence, wherein the input end of the voltage and frequency control unit is used to be connected to an external AC power supply, and the plasma generator is used to generate multiphase plasma using the multiphase voltage output by the integrated transformer unit; The integrated transformer unit includes at least one set of main transformers, the primary side of the main transformer is connected in star connection and connected to the voltage and frequency control unit, and the secondary side of the main transformer is connected to the plasma generator; The voltage and frequency control unit includes a voltage regulating circuit and an auxiliary transformer, wherein the input end of the voltage regulating circuit is used to be connected to an external AC power supply, and the output end is connected to the primary side of the main transformer; One end of the primary side of the auxiliary transformer is connected to the star point of the primary side of the main transformer, the other end of the primary side of the auxiliary transformer is grounded, one end of the secondary side of the auxiliary transformer is connected to the secondary side of the main transformer, the other end of the secondary side of the auxiliary transformer is connected to the ignition electrode of the plasma generator and is grounded; The integrated transformer unit includes a first group of main transformers and a second group of main transformers. The primary side of the first group of main transformers adopts a star connection, and the primary side of the second group of main transformers adopts a delta connection. The secondary sides of the first group of main transformers and the second group of main transformers are connected to the plasma generator.

2. The integrated transformer power supply system for a multiphase plasma generating device according to claim 1, characterized in that: Both ends of the secondary side of the main transformer are respectively connected to the electrodes of the plasma generator, the midpoint tap of the secondary side of the main transformer is connected to one end of the secondary side of the auxiliary transformer, and the other end of the secondary side of the auxiliary transformer is connected to the ignition electrode of the plasma generator and grounded.

3. The integrated transformer power supply system for a multi-phase plasma generating device according to claim 1, characterized in that: The output frequency of the auxiliary transformer is 2-4 times the output frequency of the main transformer.

4. The integrated transformer power supply system for a multi-phase plasma generating device according to claim 1, characterized in that: One end of the secondary side of the first and second main transformers is connected to the electrode of the plasma generator, and the other end is grounded.

5. The integrated transformer power supply system for a multi-phase plasma generating device according to claim 1, characterized in that: Both ends of the secondary sides of the first and second main transformers are connected to the electrodes of the plasma generator, respectively. Midpoint taps of the secondary sides of the first and second main transformers are grounded.

6. The integrated transformer power supply system for a multi-phase plasma generating device according to claim 1, characterized in that: The number of turns of the primary side coil of the second group of main transformers is twice the number of turns of the primary side coil of the first group of main transformers. times.

7. The integrated transformer power supply system for a multi-phase plasma generating device according to claim 1, characterized in that: Also includes The primary side of the group adopts the main transformer of Yanbian triangle connection, in which, is an integer greater than or equal to 1.

8. The integrated transformer power supply system for a multi-phase plasma generating device according to claim 1, characterized in that: The voltage regulation and frequency control unit is a three-phase frequency converter.

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