Self-cooled high-speed solid-state switching power device and power cabinet based on press-fit thyristors

Abstract

This utility model relates to a self-cooled high-speed solid-state switching power device and power cabinet based on a press-fit thyristor, including a power device frame, a press-fit thyristor unit, a control and protection unit, an internal cable tray unit, and an energy harvesting cable unit. The press-fit thyristor unit is fixed inside the power device frame. Input and output are achieved through internal connection groups on both sides of the power device frame. Internal insulators are fixed on the power device frame, and the internal connection groups are connected to the power device frame through the internal insulators. The control and protection unit is fixed inside the power device frame and connected to the press-fit thyristor unit. The internal cable tray unit is located at the bottom of the power device frame. The energy harvesting cable unit is located at the front of the power device frame. The advantages are: highly integrated and modular structural design, reducing the footprint of the power unit.

Description

Technical Field

[0001] This utility model belongs to the field of power electronics technology, and in particular relates to a self-cooled high-speed solid-state switching power device and power cabinet based on a press-fit thyristor. Background Technology

[0002] Solid-state high-speed switches are contactless switching devices based on press-fit thyristors. Compared to traditional mechanical switches, they effectively suppress the rate of change of fault current through the rapid switching capability of power electronic devices, preventing damage to load equipment due to overcurrent, while eliminating the risk of arcing and significantly improving system safety. Furthermore, solid-state switches support remote communication and intelligent control, and have broad application prospects in fields such as renewable energy grid connection and pulse power systems.

[0003] However, existing solid-state switching technology still faces many challenges. Under short-duration, low-current conditions, traditional solid-state switches often rely on forced air cooling or liquid cooling, requiring additional fans or pumps, resulting in bulky devices, complex maintenance, and difficulty adapting to high-dust or vibration environments. For example, patent application CN202123100679.6 discloses a solid-state switch structure for a power electronic transformer that uses air cooling. Furthermore, the heat dissipation structure design of existing self-cooled solid-state switches often fails to fully utilize natural convection, leading to insufficient heat dissipation efficiency and affecting the long-term reliability of the devices. In terms of structural design, traditional power cabinets often use fixed installations (such as bolted connections), making power unit replacement difficult. Moreover, the lack of optimized heat dissipation airflow and electromagnetic shielding designs not only affects heat dissipation performance but may also cause connections to loosen due to mechanical vibration, reducing system stability and hindering long-distance transportation.

[0004] To address the aforementioned issues, there is an urgent need for a highly integrated self-cooled solid-state switching power device and power cabinet. This device needs to achieve efficient heat dissipation under short-time current conditions through a coupling design between press-fit thyristor units and natural convection cooling, enabling fanless operation. Simultaneously, it should employ a modular structure to support rapid replacement of power units and optimize the mechanical-thermal synergy design of the cabinet, ensuring heat dissipation efficiency while improving overall mechanical strength. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, the purpose of this utility model is to provide a self-cooled high-speed solid-state switching power device and power cabinet based on press-fit thyristors with high integration and modular structure. Under short-time current conditions, natural cooling is achieved without a fan through the coupling design of press-fit thyristor units and natural convection heat dissipation. The high-speed solid-state switching power cabinet has a highly compact structure, and the modular structure inside the cabinet supports the rapid replacement of individual power units, while ensuring heat dissipation efficiency and strengthening the mechanical strength of the entire cabinet.

[0006] To achieve the above objectives, this utility model employs the following technical solution:

[0007] A self-cooled high-speed solid-state switching power device based on a press-fit thyristor includes a power device frame, a press-fit thyristor unit, a control and protection unit, an internal cable tray unit, and an energy harvesting cable unit.

[0008] The press-fit thyristor unit is fixed inside the power device frame. The power device frame is connected to the power device frame via the internal connection group of the unit. The internal insulator of the unit is fixed on the power device frame. The internal connection group of the unit is connected to the power device frame via the internal insulator of the unit.

[0009] The control and protection unit is fixed inside the power device frame and is connected to the press-fit thyristor unit;

[0010] Internal cable tray units are located at the bottom of the power device frame for fiber optic connections;

[0011] The power harvesting cable unit is located at the front of the power device frame and is connected to the control and protection unit via a pulse signal line.

[0012] The press-fit thyristor unit includes a thyristor module, a solid aluminum block heat sink, an end plate, and a clamping plate. The thyristor module and the solid aluminum block heat sink are stacked together in an alternating manner, and the thyristor module is provided with solid aluminum block heat sinks on both sides. The end plate and the clamping plate form a frame structure. The end plate is used to clamp the two ends of the thyristor module and the solid aluminum block heat sink, and the clamping plate is used to clamp the two sides of the thyristor module and the solid aluminum block heat sink.

[0013] The control and protection unit includes a control and protection unit base plate, a capacitor, a resistor, and a control board. The capacitor, resistor, and control board are fixed on the control and protection unit base plate.

[0014] The power harvesting cable unit includes a power harvesting cable unit base plate, a pulse transformer, and a pulse line holder; the pulse transformer and the pulse line holder are fixedly connected to the power harvesting cable unit base plate.

[0015] The power device frame is made of sheet metal parts, and reinforcing beams are fixedly connected to the power device frame laterally.

[0016] A self-cooled high-speed solid-state switch power cabinet based on a press-fit thyristor includes a cabinet body and a front door. The power device is installed inside the cabinet body. The front part of the cabinet body is hinged to the front door. An air filter is installed on the front door. An insulator support plate is installed at the rear of the cabinet body. The top of the cabinet body is provided with an optical fiber duct and a lifting ring. The bottom of the cabinet body is provided with a primary cable inlet and a secondary cable inlet.

[0017] It also includes input / output bars and input / output bar insulators. The insulator support plate is provided with mounting holes. The input / output bar insulators are fixedly connected to the insulator support plate through the mounting holes. The input / output bars are fixedly connected to the input / output bar insulators. The input / output bars pass through the top and bottom of the cabinet. The power device is connected to the input / output bars.

[0018] It also includes a modular installation frame and unit support feet. Several unit support feet are welded to the side of the cabinet, and a modular installation frame is fixed on the unit support feet. Slide rails are installed between the modular installation frames, and the power device is installed on the modular installation frame through the slide rails.

[0019] The bottom of the cabinet is equipped with a power supply unit, which is connected to the power device via a cable.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1) The self-cooled high-speed solid-state switching power device based on press-fit thyristors has a highly integrated and modular structural design, which reduces the footprint of the power unit.

[0022] 2) Under short-time current conditions, natural cooling is achieved without a fan by using a press-fit thyristor unit coupled with natural convection heat dissipation design, thereby reducing the impact of dust, vibration and noise.

[0023] 3) The self-cooled high-speed solid-state switch power cabinet based on press-fit thyristors has a highly compact structure and a modular internal structure. The power devices can be quickly installed in the cabinet through the slide rails, supporting modular replacement, convenient maintenance, reducing downtime, and strengthening the mechanical strength of the entire cabinet while ensuring heat dissipation efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a self-cooled high-speed solid-state switching power device based on a press-fit thyristor.

[0025] Figure 2 This is a schematic diagram of the structure of a press-fit thyristor unit.

[0026] Figure 3 This is a schematic diagram of the control and protection unit.

[0027] Figure 4 This is a structural schematic diagram of the power harvesting cable unit.

[0028] Figure 5 This is a structural diagram of the cabinet.

[0029] Figure 6 It is a layout diagram of the internal components of the cabinet.

[0030] Figure 7 This is a schematic diagram showing the connection between the modular installation frame and the slide rail.

[0031] In the diagram: 1. Power unit frame; 2. Press-fit thyristor unit; 3. Internal connection bar of the unit; 4. Internal insulator of the unit; 5. Control and protection unit; 6. Internal cable tray unit; 7. Power extraction cable unit; 8. Reinforcing beam; 21. Thyristor module; 22. Solid aluminum block heat sink; 23. End plate; 24. Clamping plate; 25. Fastening device; 26. Interconnecting copper busbar; 51. Control and protection unit base plate; 52. Capacitor; 53. Resistor; 54. Control board; 71. Power extraction cable. 72. Power cable unit base plate; 73. Pulse transformer; 100. Pulse line holder; 101. Cabinet; 102. Unit support foot; 103. Front cabinet door; 104. Air filter; 105. Insulator support plate; 106. Fiber optic cable tray; 107. Lifting ring; 108. Primary cable inlet; 109. Secondary cable inlet; 200. Input / output bar; 300. Input / output bar insulator; 400. Modular mounting frame; 500. Slide rail; 600. Power supply unit. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0033] Example 1

[0034] See Figure 1 A self-cooled high-speed solid-state switching power device based on a press-fit thyristor includes a power device frame 1, a press-fit thyristor unit 2, a control and protection unit 5, an internal cable tray unit 6, and an energy harvesting cable unit 7.

[0035] The power unit frame 1 provides structural support and mechanical strength for the entire power unit. The press-fit thyristor unit 2 is fixed inside the power unit frame 1. Input and output are achieved through internal connection groups 3 on both sides of the power unit frame 1. Internal insulators 4 are fixed to the power unit frame 1, and the internal connection groups 3 are connected to the input and output terminals of the power unit frame 1 through the internal insulators 4. The press-fit thyristor unit 2 provides the core current control capability for the entire power unit.

[0036] The control and protection unit 5 is fixed inside the power device frame 1. The control and protection unit 5 is connected to the press-fit thyristor unit 2, providing core control and safety assurance capabilities for the entire power device.

[0037] The internal cable tray unit 6 is located at the bottom of the power device frame 1 and is used for optical fiber connection, providing effective shielding and protection for the optical fiber of the control system.

[0038] The power extraction cable unit 7 is located at the front of the power device frame 1, and is connected to the control and protection unit 5 via a pulse signal line. Through autonomous high-voltage energy extraction, isolated power supply, and high-speed signal transmission, the power extraction cable unit 7 enables the solid-state switch to provide power and control in environments without external power supply and under high electromagnetic interference.

[0039] See Figure 2 The press-fit thyristor unit 2 includes a thyristor module 21, a solid aluminum block heat sink 22, an end plate 23, and a clamping plate 24. The thyristor module 21 and the solid aluminum block heat sink 22 are stacked together in an alternating manner, with solid aluminum block heat sinks 22 on both sides of the thyristor module 21, forming a series of press-fit thyristor modules. The end plate 23 and the clamping plate 24 form a frame structure with fasteners. Axial pressure is applied by the fastening device 25 and bolts to ensure that the contact surfaces of the thyristor module 21 and the solid aluminum block heat sink 22 are tightly fitted, pressing and fixing the thyristor module 21 and the solid aluminum block heat sink 22 onto the frame structure. The end plate 23 is used to clamp the two ends of the thyristor module 21 and the solid aluminum block heat sink 22, and the clamping plate 24 is used to clamp the two sides of the thyristor module 21 and the solid aluminum block heat sink 22. The solid aluminum block heat sink 22 is mainly made of solid aluminum, utilizing the high thermal conductivity of aluminum to achieve uniform heat dissipation, eliminating the need for additional fans or liquid cooling systems, thus reducing energy consumption and noise. The thyristor module 21 is tightly fitted to the solid aluminum block heat sink 22, reducing thermal resistance, improving heat dissipation efficiency, avoiding the aging problem of the weld layer in traditional welded thyristors, and extending service life. The positive and negative strings of press-fit thyristor modules are connected by interconnecting copper busbars 26; the assembled press-fit thyristor unit 2 is fixed to the power device frame 1.

[0040] See Figure 3 The control and protection unit 5 includes a control and protection unit base plate 51, a capacitor 52, a resistor 53, and a control board 54. The capacitor 52, resistor 53, and control board 54 are fixed on the control and protection unit base plate 51. The control boards 54 are arranged in a row, and the capacitor 52 is positioned between the resistor 53 and the control board 54. The capacitor 52, resistor 53, and control board 54 are arranged in a specific order. Figure 3 The layout shown is designed to minimize dimensions while ensuring electrical safety distances, ensuring a compact structure and rapid response and protection (such as overvoltage and overcurrent protection). The control and protection unit base plate 51 provides support. The control and protection unit 5 is bolted to the power device frame 1.

[0041] See Figure 4The power harvesting cable unit 7 includes a power harvesting cable unit base plate 71, a pulse transformer 72, and a pulse line retainer 73. The pulse transformer 72 and the pulse line retainer 73 are fixedly connected to the power harvesting cable unit base plate 71. The pulse transformer 72 is arranged in a straight line, and the pulse line retainers 73 are set on the outer sides of both ends to fix the power harvesting cable. The power harvesting cable unit base plate 71 provides support for the pulse transformer 72 and the pulse line retainer 73. The power harvesting cable unit 7 is connected to the power device frame 1 by bolts. In addition, the power harvesting cable unit 7 also acts as a reinforcing beam 8, improving the rigidity and mechanical strength of the entire power device.

[0042] See Figure 1 The power unit frame 1 is constructed from sheet metal parts and consists of two frame structures. A reinforcing beam 8 is fixedly connected between the two frame structures to enhance the overall rigidity of the power unit. The reinforcing beam 8 can be fixed to the top of the power unit frame 1 to improve the overall mechanical strength of the power unit and resist vibration and deformation during transportation or operation.

[0043] Example 2

[0044] See Figure 5 , Figure 6 A self-cooled high-speed solid-state switchgear based on press-fit thyristors includes a cabinet 100 and a front door 102. Both the cabinet 100 and the front door 102 are formed by bending and welding cold-rolled steel plates and have a powder-coated surface. The power device is installed inside the cabinet 100. The front of the cabinet 100 is hinged to the front door 102, and an air filter 103 is installed on the front door 102 to ensure efficient heat dissipation inside the cabinet. The air filter 103 has a detachable structure for easy disassembly and cleaning. Ambient cold air enters from the bottom of the cabinet 100 through the air filter 103, and the cold air comes into full contact with and cools the solid aluminum block heat sink 22. The heated air is naturally cooled through heat exchange with the walls of the cabinet 100. An insulator support plate 104 is installed at the rear of the cabinet 100 to support the input / output bar 200. The top of the cabinet 100 is equipped with an optical fiber cable tray 105 and a lifting ring 106, which enables the cabinet 100 to be transported quickly. The bottom of the cabinet 100 is equipped with a primary cable inlet hole 107 and a secondary cable inlet hole 108. The inner wall of the hole is covered with a rubber sealing ring to effectively protect the optical fiber and cable, and to allow the optical fiber, primary cable and secondary cable to be routed separately to prevent line interference.

[0045] See Figure 6 An insulator support plate 104 is installed at the rear of the cabinet 100. The insulator support plate 104 has mounting holes. The input / output bar insulator 300 is fixedly connected to the insulator support plate 104 through the mounting holes. The input / output bar 200 is fixedly connected to the input / output bar insulator 300. The input / output bar 200 passes through the top and bottom of the cabinet 100. The power device is connected to the input / output bar 200.

[0046] See Figures 5-7 The cabinet 100 has several unit support legs 101 welded to both sides. Modular mounting frames 400, made of resin, are fixed to the unit support legs 101. The modular mounting frames 400 are arranged equidistantly from top to bottom inside the cabinet 100. Three-phase power devices are mounted on the modular mounting frames 400, effectively reducing the distance between the three-phase power devices while meeting strength requirements, resulting in a compact structure. A slide rail 500 is installed between each phase of the modular mounting frame 400. The power devices are mounted on the modular mounting frames 400 via the slide rails 500. Besides effectively supporting the power devices, the slide rails 500 also enhance the stability of the modular mounting frames 400. Three such... Figure 1 The power unit is installed inside the cabinet 100 via a slide rail 500. The power unit module can be horizontally pushed into the front of the cabinet 100 via the slide rail 500 and connected to the input / output row 200 at the rear of the cabinet 100. The power harvesting unit 600 is connected to the power unit via a cable and is installed at the bottom of the cabinet 100, effectively utilizing the space of the cabinet 100.

[0047] This utility model features a highly integrated and modular structural design, reducing the footprint of the power unit. Under short-time current conditions, natural cooling is achieved without a fan through the coupling design of the press-fit thyristor unit 2 and natural cooling, reducing the impact of dust, vibration, and noise. The power cabinet has a highly compact structure, and the modular structure inside the cabinet allows for quick replacement of individual power units, while ensuring heat dissipation efficiency and strengthening the overall mechanical strength of the cabinet.

[0048] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0049] Through the above specific embodiments, those skilled in the art can easily implement this utility model. However, it should be understood that this utility model is not limited to the specific embodiments described above. Based on the disclosed embodiments, those skilled in the art can arbitrarily combine different technical features to achieve different technical solutions. Due to space limitations and for the sake of brevity, not all of these combined solutions have been described. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A self-cooled high-speed solid-state switching power device based on a press-fit thyristor, characterized in that, It includes a power device frame, a press-fit thyristor unit, a control and protection unit, an internal cable tray unit, and an energy harvesting cable unit; The press-fit thyristor unit is fixed inside the power device frame. The power device frame is connected to the power device frame via the internal connection group of the unit. The internal insulator of the unit is fixed on the power device frame. The internal connection group of the unit is connected to the power device frame via the internal insulator of the unit. The control and protection unit is fixed inside the power device frame and is connected to the press-fit thyristor unit; Internal cable tray units are located at the bottom of the power device frame for fiber optic connections; The power harvesting cable unit is located at the front of the power device frame and is connected to the control and protection unit via a pulse signal line.

2. A self-cooled high speed solid state switching power device based on crimped thyristor as claimed in claim 1, wherein, The press-fit thyristor unit includes a thyristor module, a solid aluminum block heat sink, an end plate, and a clamping plate. The thyristor module and the solid aluminum block heat sink are stacked together in an alternating manner, and the thyristor module is provided with solid aluminum block heat sinks on both sides. The end plate and the clamping plate form a frame structure. The end plate is used to clamp the two ends of the thyristor module and the solid aluminum block heat sink, and the clamping plate is used to clamp the two sides of the thyristor module and the solid aluminum block heat sink.

3. A self-cooled high speed solid state switching power device based on crimped thyristor as claimed in claim 1, wherein, The control and protection unit includes a control and protection unit base plate, a capacitor, a resistor, and a control board. The capacitor, resistor, and control board are fixed on the control and protection unit base plate.

4. A self-cooled high speed solid state switching power device based on crimped thyristor as claimed in claim 1, wherein, The power harvesting cable unit includes a power harvesting cable unit base plate, a pulse transformer, and a pulse line holder; the pulse transformer and the pulse line holder are fixedly connected to the power harvesting cable unit base plate.

5. The self-cooled high-speed solid-state switching power device based on a press-fit thyristor according to claim 1, characterized in that, The power device frame is made of sheet metal parts, and reinforcing beams are fixedly connected to the power device frame laterally.

6. A self-cooled high speed solid state switching power cabinet based on crimped thyristors, characterized in that, The device includes a self-cooled high-speed solid-state switching power device based on a press-fit thyristor as described in any one of claims 1-5, a cabinet, and a front cabinet door. The power device is installed inside the cabinet, the front of the cabinet is hinged to the front cabinet door, an air filter is installed on the front cabinet door, and an insulator support plate is installed at the rear of the cabinet. The top of the cabinet is provided with an optical fiber duct and a lifting ring, and the bottom of the cabinet is provided with a primary cable inlet and a secondary cable inlet.

7. A self-cooled high speed solid state switching power cabinet based on crimped thyristors according to claim 6, characterized in that, It also includes input / output bars and input / output bar insulators. The insulator support plate is provided with mounting holes. The input / output bar insulators are fixedly connected to the insulator support plate through the mounting holes. The input / output bars are fixedly connected to the input / output bar insulators. The input / output bars pass through the top and bottom of the cabinet. The power device is connected to the input / output bars.

8. A self-cooled high speed solid state switching power cabinet based on crimped thyristors according to claim 6, characterized in that, It also includes a modular installation frame and unit support feet. Several unit support feet are welded to the side of the cabinet, and a modular installation frame is fixed on the unit support feet. Slide rails are installed between the modular installation frames, and the power device is installed on the modular installation frame through the slide rails.

9. A self-cooled high speed solid state switching power cabinet based on crimped thyristors as claimed in claim 6, wherein, The bottom of the cabinet is equipped with a power supply unit, which is connected to the power device via a cable.

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