Solid state circuit breaker with isolation function

Abstract

This invention discloses a solid-state circuit breaker with isolation function, including a base, an operating mechanism, a rotating shaft assembly, a stationary contact assembly, a moving contact assembly, a silicon carbide module, and a terminal block. The base has an open front and contains, from top to bottom, an upper cavity, a mechanism groove, a middle cavity, and a lower groove. The operating mechanism is installed in the mechanism groove, and the rotating shaft assembly is linked to it. The stationary contact assembly is fixed in the upper cavity. The moving contact assembly is installed on the rotating shaft assembly. The silicon carbide module is located in the middle cavity. The terminal block is placed in the lower groove. This invention, through a layered cavity design within the base, compactly arranges the components, significantly reducing the product size. The silicon carbide module is horizontally placed to form a compact layout with the contact system. The circuit board is stacked and mounted on a step. The microswitch is directly triggered by a lever, requiring no auxiliary parts. It has the advantages of small size, high integration, reliable isolation, and easy replacement of traditional circuit breakers.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, specifically to a hybrid solid-state circuit breaker with isolation function, mainly used in low-voltage power distribution systems to achieve rapid circuit disconnection, remote control and safety isolation. Background Technology

[0002] With the continuous improvement of electrical safety standards and the rapid development of new energy, transportation electrification, and industrial automation, higher performance requirements are being placed on low-voltage circuit breakers, a key protective device. The market generally expects circuit breakers to have faster breaking speeds, higher control precision, remote control capabilities, and better compatibility with industrial automation systems.

[0003] Traditional mechanical circuit breakers rely on the mechanical action of contacts to break circuits. Their breaking speed is relatively slow, and they inevitably generate electric arcs during the breaking process, requiring complex arc-extinguishing systems. This not only limits further improvements in breaking capacity but also affects electrical life and reliability. Especially in emerging applications such as DC systems or solid-state transformers, the operating time of traditional mechanical circuit breakers is insufficient to meet the requirements for rapid limiting of short-circuit currents.

[0004] Meanwhile, advancements in semiconductor device technology, particularly the maturation of wide-bandgap semiconductor materials such as silicon carbide (SiC), have provided a technological foundation for developing novel low-voltage solid-state circuit breakers (SSCBs). Solid-state circuit breakers utilize power semiconductor devices to connect and disconnect circuits, offering significant advantages such as arc-free operation, rapid response (microseconds), long lifespan, and no mechanical wear. They represent an ideal technological path for miniaturizing and intelligentizing circuit breakers.

[0005] However, most existing solid-state circuit breaker designs still have significant shortcomings in practical applications. These mainly manifest in the following ways: the overall product size is large, and the internal structure is not compact enough, resulting in significant differences in size and installation methods compared to traditional mechanical circuit breakers. This leads to numerous space constraints when directly replacing or upgrading solid-state circuit breakers in space-constrained scenarios such as existing distribution cabinets and terminal distribution boxes, hindering the large-scale promotion and application of solid-state circuit breakers. Therefore, how to design a compact, small-sized, and physically isolated hybrid solid-state circuit breaker to ensure maintenance safety has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide a solid-state circuit breaker with isolation function, thereby solving the problems of existing solid-state circuit breakers being large in size, having a loose internal structure, having significant differences in installation dimensions compared to conventional circuit breakers, and being difficult to replace in limited spaces.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A solid-state circuit breaker with isolation function includes a base, an operating mechanism, a rotating shaft assembly, a stationary contact assembly, a moving contact assembly, a silicon carbide module, and a terminal block. The base has an open front and, from top to bottom, is provided with an upper cavity, a mechanism groove, a middle cavity, and a lower groove. The operating mechanism is installed in the mechanism groove. The rotating shaft assembly is rotatably installed in the mechanism groove and is linked with the operating mechanism. The stationary contact assemblies are fixed in the upper cavity. The moving contact assembly is installed on the rotating shaft assembly and can separate from or contact the stationary contact assembly as the rotating shaft assembly rotates. The silicon carbide module is horizontally arranged in the middle cavity and forms a compact layout with the moving contact assembly in a layered and horizontally staggered manner. The terminal block is disposed in the lower groove.

[0008] Furthermore, there are two stationary contact assemblies, located on opposite sides of the upper cavity; the moving contact assembly includes a positive contact assembly and a negative contact assembly, which are respectively mounted at both ends of the rotating shaft assembly and correspond one-to-one with the two stationary contact assemblies; the silicon carbide module is horizontally positioned within the middle cavity, forming a compact, layered, and horizontally staggered layout with the positive and negative contact assemblies; the terminal block includes a positive terminal block and a terminal board, and the positive terminal block, positive contact assembly, and corresponding stationary contact assembly are connected in series to form a positive circuit; the terminal board, negative contact assembly, and corresponding stationary contact assembly are connected in series to form a negative circuit.

[0009] Furthermore, it also includes a current transformer, with the head of the positive contact assembly passing through a pre-set center hole on the current transformer.

[0010] Furthermore, steps are provided on both sides of the interior of the central cavity to support and arrange multiple circuit board modules in a stacked manner. The multiple circuit board modules include a voltage module and a main control module, a power module, and an energy absorption module that are sequentially installed on the steps from the front to the back. The silicon carbide module is located on the back of the energy absorption module. The voltage module is installed in the middle cavity of the upper cavity, and the middle cavity is located between the two stationary contact assemblies.

[0011] Furthermore, it also includes a cover plate, a silicon carbide control module, and a heat sink; the cover plate is locked to the back of the base; the silicon carbide control module and the heat sink are disposed between the cover plate and the base; the silicon carbide module is fixed to the heat sink and is inserted into the central cavity through a pre-set rectangular hole on the back of the base, and is confined to a pre-set groove surface on the back of the base.

[0012] Furthermore, it also includes a power tap; the power tap is installed on the energy absorption module; the power tap and the positive electrode contact assembly are locked to the silicon carbide control module by fasteners and are both electrically connected to the silicon carbide control module.

[0013] Furthermore, it also includes a face cover; the face cover is locked to the opening on the front of the base; a square hole and a round hole are provided on the front of the face cover, a square button cap is installed in the square hole, and a round button cap is installed in the round hole, and the round holes are arranged vertically on the right side of the face cover; a display and control module is fixed on the inner side of the face cover, and the square button cap and the round button cap are respectively installed on the buttons of the display and control module.

[0014] Furthermore, it also includes a micro switch fixed to the inside of the cover; the operating mechanism has a lever, the micro switch is disposed on the side of the lever, and when the lever rotates, its side wall directly contacts or disengages from the roller of the micro switch.

[0015] Furthermore, it also includes an arc-extinguishing chamber, a front partition, and a rear partition; the arc-extinguishing chamber is installed in the upper cavity and is arranged adjacent to the stationary contact assembly; upper slots are provided on both sides of the cavity for the stationary contact assembly in the upper cavity, and the front partition is installed in the upper slot (for separating the terminal of the stationary contact assembly connected to the external power supply from the interior of the base); at the same time, lower slots are provided on both sides of the cavity for installing the terminal block in the lower groove, and the rear partition is installed in the lower slot (for separating the terminal of the terminal block connected to the load from the interior of the base).

[0016] Furthermore, it also includes a handle, which is mounted on the operating mechanism for manually driving the rotating shaft assembly to achieve the isolation function, and the end of the handle extends out of the face cover from a preset hole on the face cover.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) By setting the upper cavity, mechanism groove, middle cavity and lower groove in the base from top to bottom, the stationary contact assembly, operating mechanism and rotating shaft assembly, silicon carbide module and terminal block are arranged in layers, so that the internal space of the circuit breaker is fully utilized, the overall volume of the product is greatly reduced, and it is convenient to directly replace the traditional circuit breaker in the existing distribution box cabinet.

[0018] (2) The silicon carbide module is placed horizontally and forms a small space layout with the contact system. Combined with the compact design of the positive contact assembly head passing through the current transformer, the space occupied by the main circuit is further compressed, while ensuring the reliability of the electrical connection.

[0019] (3) The stepped structure in the middle cavity is used to realize the stacked arrangement of the circuit board. The main control module, power supply module and energy absorption module are installed in sequence from the front to the back. The silicon carbide module is located on the back of the energy absorption module, so that the circuit board mounting position and the device arrangement position are independently separated, which improves the availability of the circuit board, simplifies the assembly process, and realizes a convenient installation method from front to back.

[0020] (4) The micro switch is directly set on the side of the lever of the operating mechanism. When the lever rotates, its side wall directly contacts or disengages from the roller of the micro switch. Signal triggering can be achieved without any auxiliary parts. The structure is simple and the response is reliable.

[0021] (5) The cover uses square button caps and round button caps, and the round holes are arranged vertically on the right side, which makes operation convenient and less prone to misoperation; at the same time, the difference in shape between the square holes and the round holes allows users to intuitively distinguish different function buttons, which improves the human-computer interaction experience.

[0022] (6) The manual handle is linked with the operating mechanism, which can forcibly disconnect the circuit under load when the electronic device is abnormal, providing reliable backup protection; at the same time, the whole machine is in a physically isolated state after the handle is opened, ensuring the safety of maintenance personnel. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the solid-state circuit breaker with isolation function described in this invention.

[0024] Figure 2 This is an exploded structural diagram of the solid-state circuit breaker with isolation function described in this invention.

[0025] Figure 3 This is a schematic diagram of the structure of the cover described in this invention.

[0026] Figure 4 This is a schematic diagram of the structure of the base described in this invention (the top left figure is the front view of the base, the top right figure is the rear view of the base, the bottom left figure is a perspective view of the base, and the bottom right figure is a perspective view of the base from another angle).

[0027] Figure 5 This is a schematic diagram of the moving contact assembly described in this invention.

[0028] Figure 6 This is a schematic diagram of the structure of the stationary contact assembly described in this invention.

[0029] Figure 7 This is a schematic diagram of the current transformer described in this invention.

[0030] Figure 8 This is a schematic diagram of the positive terminal block of the present invention.

[0031] Figure 9 This is a schematic diagram of the micro switch described in this invention.

[0032] Figure 10 This is a schematic diagram of the power tapping busbar described in this invention.

[0033] Figure 11 This is a schematic diagram of the display and control module described in this invention.

[0034] Figure 12 This is a schematic diagram of the structure of the heat sink described in this invention.

[0035] Figure 13 This is a schematic diagram of the main circuit current path described in this invention.

[0036] Figure 14 This is a schematic diagram of the internal module layout structure of the circuit breaker described in this invention.

[0037] Figure 15 This is a block diagram showing the connection relationships between the circuit boards of this invention.

[0038] Figure 16 This is a schematic diagram of the internal micro switch and lever mechanism of the present invention (the left image is a top view, and the right image is a perspective view).

[0039] Figure 17 This is a schematic diagram of the main circuit described in this invention.

[0040] As shown in the diagram: 100 - front cover; 101 - column position; 102 - mounting hole; 103 - square hole; 104 - round hole; 200 - square button cap; 300 - round button cap; 400 - micro switch; 401 - roller; 500 - display and control module; 501 - button; 600 - voltage module; 700 - main control module; 800 - power module; 900 - power supply bar; 901 - center through hole; 1000 - rear partition; 11 00-Current transformer; 1101-Center hole; 1200-Positive terminal block; 1201-Terminal block; 1300-Positive contact assembly; 1301-Head; 1302-Terminal block through hole; 1400-Silicon carbide module; 1500-Energy absorption module; 1600-Negative contact assembly; 1601-Terminal block; 1700-Operating mechanism; 1701-Lever; 1702-Bracket; 1800-Handle; 1900- 2000-Stabilized Contact Assembly; 2100-Arc Extinguishing Chamber; 2200-Front Partition; 2300-Screw One; 2400-Base; 2401-Upper Cavity; 2402-Mechanical Groove; 2403-Middle Cavity; 2404-Lower Groove; 2405-Intermediate Cavity; 2406-Rectangular Hole; 2407-Nut One; 2408-Nut Two; 2409-Nut Three; 2412-Nut 4; 2413-Embedded Nut 5; 2414-Embedded Nut 6; 2410-Mounting Hole; 2411-Groove Surface; 2415-Upper Slot; 2416-Lower Slot; 2417-Step; 2500-Screw 2; 2600-Silicon Carbide Control Module; 2700-Heat Dissipation Plate; 2701-Threaded Hole; 2800-Cover Plate; 2900-Screw 3; 3000-Screw 4; 3100-Screw 5; 3200-Screw 6. Detailed Implementation

[0041] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0043] In the description of this invention, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. It should be noted that the terms "comprising," "including," or any other variations are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Example 1

[0044] like Figures 1 to 16 As shown, this embodiment provides a solid-state circuit breaker with isolation function, which mainly includes a housing, an operating mechanism 1700, a rotating shaft assembly 1900, a stationary contact assembly 2000, a moving contact assembly, a silicon carbide module 1400, a terminal block, a handle 1800, a micro switch 400, and other circuit board modules.

[0045] like Figures 1 to 4 As shown, the housing serves to support and protect all its internal components, providing a mounting base and electrical isolation. The housing includes a faceplate 100, a base 2400, and a cover plate 2800. The base 2400 is an insulated housing with a front opening, serving as the overall mounting base. Its interior, from top to bottom, comprises an upper cavity 2401, a mechanism recess 2402, a middle cavity 2403, and a lower recess 2404 (see [reference]). Figure 4A rectangular hole 2406 communicating with the central cavity 2403 is provided on the back of the base 2400. Stepped steps 2417 are provided on both sides inside the central cavity 2403 to support and arrange multiple circuit board modules in a stacked manner. A front cover 100 is used to close the front opening of the base 2400, providing an operating interface and display window. The front cover 100 is locked to the front of the base 2400 by screws 2300. A square hole 103 and a round hole 104 are provided on the front of the front cover 100. A square button cap 200 is installed in the square hole 103, and a round button cap 300 is installed in the round hole 104. The round holes 104 are arranged vertically on the right side of the front cover 100. A cover plate 2800 is locked to the back of the base 2400 by screws 3000 to close the back of the base 2400 and protect the internal electronic components.

[0046] like Figure 16 As shown, the operating mechanism 1700 is installed in the mechanism groove 2402 of the base 2400 and is used to drive the rotating shaft assembly 1900 to rotate. The operating mechanism 1700 has a bracket 1702 and a lever 1701. The bracket 1702 serves as the support carrier for the operating mechanism 1700 and is locked to the base 2400 by screws 2300. The lever 1701 is rotatably mounted on the bracket 1702 and is used to drive the rotating shaft assembly 1900 to rotate. The signal output terminal of the micro switch 400 is connected to the switch input port of the main control module 700 through a wire to transmit the position status signal of the lever 1701 to the main control module 700 to determine the mechanical position of the operating mechanism.

[0047] like Figure 9 and Figure 16 As shown, the micro switch 400 is used to detect the position status of the operating mechanism 1700 and feeds back the rotation position signal of the lever 1701 to the main control module 700. The micro switch 400 is locked to the column position 101 inside the faceplate 100 by screws 3200 and is located on the side of the lever 1701. When the lever 1701 rotates, its side wall directly contacts or disengages from the roller 401 of the micro switch 400, thereby achieving signal triggering without any auxiliary parts.

[0048] like Figure 2 , Figure 13 as well as Figure 17 As shown, the rotating shaft assembly 1900 is rotatably mounted in the mechanism groove 2402 of the base 2400 and is linked with the operating mechanism 1700 (lever 1701) to carry the moving contact assembly and transmit the movement of the operating mechanism 1700.

[0049] like Figure 6 , Figure 13 as well as Figure 17As shown, the stationary contact assembly 2000 is used to cooperate with the moving contact assembly to form a separable mechanical contact, thereby achieving physical isolation of the circuit. There are two stationary contact assemblies 2000, which are respectively fixed to both sides of the upper cavity 2401 of the base 2400 by screws 2500.

[0050] like Figure 5 , Figure 13 as well as Figure 17 As shown, the moving contact assembly is used to contact or separate from the stationary contact assembly 2000 to complete the mechanical switching. The moving contact assembly includes a positive contact assembly 1300 and a negative contact assembly 1600. The positive contact assembly 1300 is installed at one end of the rotating shaft assembly 1900, and the negative contact assembly 1600 is installed at the other end of the rotating shaft assembly 1900, and each corresponds one-to-one with the two stationary contact assemblies 2000 (positions). The positive contact assembly 1300 has a conductive metal head 1301, a terminal block with a terminal block through-hole 1302, and a flexible wire connecting the two. The head 1301 of the positive contact assembly 1300 passes through the center hole 1101 of a current transformer 1100 and is mounted on one end of the rotating shaft assembly 1900, and can separate from or contact the corresponding stationary contact assembly 2000 as the rotating shaft assembly 1900 rotates. The terminal block with the terminal block through-hole 1302 is mounted on the inlet terminal of the silicon carbide module 1400. The negative contact assembly 1600 also has a conductive metal head, a terminal block 1601, and a flexible wire connecting the two. The head of the negative contact assembly 1600 is mounted on the other end of the rotating shaft assembly 1900 and can separate from or contact the corresponding stationary contact assembly 2000 as the rotating shaft assembly 1900 rotates. The positive contact assembly 1300 and the negative contact assembly 1600 are separated from or make contact with the corresponding stationary contact assembly 2000 as the rotating shaft assembly 1900 rotates.

[0051] like Figure 2 , Figure 13 as well as Figure 17 As shown, the silicon carbide module 1400 serves as the main circuit power semiconductor device, responsible for the rapid connection and disconnection of the circuit and normal current carrying. The silicon carbide module 1400 is horizontally positioned within the central cavity 2403 of the base 2400, forming a compact, layered, and horizontally staggered arrangement with the positive contact assembly 1300 and the negative contact assembly 1600. The silicon carbide module 1400 is secured to the threaded hole 2701 of the heat sink 2700 by screw three 2900, then inserted into the central cavity 2403 through the rectangular hole 2406 on the back of the base 2400, and confined to the groove surface 2411 of the base 2400. Finally, it is secured to the embedded nut four 2412 of the base 2400 by screw three 2900.

[0052] like Figure 8 , Figure 13 as well as Figure 17 As shown, the terminal block is used to connect an external power source and a load, forming the main circuit current path. The terminal block includes a positive terminal block 1200 and a terminal plate 1601. The terminal plate 1201 of the positive terminal block 1200 is installed into one side of the lower groove 2404 of the base 2400 (the terminal plate 1201 of the positive terminal block 1200 and its output terminal are electrically connected by a flexible wire), and the terminal plate 1601 is also installed into the other side of the lower groove 2404. Both are locked to the base 2400 by screws 2500. The positive terminal block 1200, the positive contact assembly 1300, and the corresponding stationary contact assembly 2000 are connected in series to form a positive circuit; the terminal plate 1601, the negative contact assembly 1600, and the corresponding stationary contact assembly 2000 are connected in series to form a negative circuit. The main circuit current path is as follows. Figure 13 As shown: After closing, the current enters the positive circuit from the positive input terminal at the top of the circuit breaker, first passing through the stationary contact assembly 2000 of the positive circuit, then through the positive contact assembly 1300, flowing through the current transformer 1100, then through the silicon carbide module 1400, to the positive terminal block 1200 at the bottom of the circuit breaker, then from the positive output terminal of the positive terminal block 1200 into the load, and then from the load back to the negative input terminal at the bottom of the circuit breaker, first passing through the terminal block 1601, then through the negative contact assembly 1600, then through the stationary contact assembly 2000 of the negative circuit, reaching the negative output terminal at the top of the circuit breaker, and finally returning to the power grid.

[0053] like Figure 1 and Figure 2As shown, the handle 1800 is used for manual operation, realizing manual opening and closing of the circuit breaker and isolation functions. The handle 1800 is mounted on the operating mechanism 1700, and the end of the handle 1800 extends out of the face cover 100 through a pre-set hole. When the handle 1800 is manually pushed, the handle 1800 drives the operating mechanism 1700, and the lever 1701 inside the operating mechanism 1700 rotates accordingly, thereby driving the rotating shaft assembly 1900 to rotate. When the handle 1800 is manually pushed to the closed position, it drives the lever 1701 to rotate and triggers the micro switch 400. The micro switch 400 feeds back a signal to the main control module 700, and the silicon carbide module 1400 meets the closing condition. At this time, pressing the circular button cap 300 on the panel can close the circuit breaker; pressing the other circular button cap 300 can open the circuit breaker. When the handle 1800 moves in the reverse direction to a certain angle, and the moving and stationary contacts have not yet disengaged, the signal of the microswitch 400 changes. The main control module 700 will then disconnect the silicon carbide module 1400 according to the software-set rules to ensure circuit safety. After the handle 1800 is opened, the entire machine is in a physically isolated state. If the silicon carbide module 1400 fails to disconnect normally due to an abnormality, the operator can forcibly drive the operating mechanism 1700 through the handle 1800 to mechanically separate the moving contact assembly from the stationary contact assembly 2000, thereby achieving circuit disconnection under load and providing backup protection.

[0054] like Figure 15 As shown, other circuit board modules include current transformer 1100, voltage module 600, main control module 700, energy absorption module 1500, display and control module 500, and silicon carbide control module 2600, etc.

[0055] like Figure 2 and Figure 7 As shown, the current transformer 1100 (through the central hole 1101 provided thereon) is sleeved on the head 1301 of the positive contact assembly 1300. The signal output terminal of the current transformer 1100 (current module) is connected to the current sampling port of the main control module 700 through a wire, which is used to transmit the collected main circuit current signal to the main control module 700 for overcurrent detection and protection judgment.

[0056] like Figure 2 As shown, the voltage module 600 is installed in the intermediate cavity 2405 of the upper cavity 2401 of the base 2400. The intermediate cavity 2405 is located between the two stationary contact assemblies 2000 and is locked to the embedded nut 2414 of the base 2400 by screw 2500. The two input terminals of the voltage module 600 are respectively connected in parallel to the positive and negative input terminals of the circuit breaker through wires. The output terminal of the voltage module 600 is connected to the voltage sampling port of the main control module 700 through wires to collect the voltage signal on the input side of the circuit breaker for voltage monitoring and protection by the main control module 700.

[0057] like Figure 2 As shown, the main control module 700 is locked to the base 2400 by screw 2500 and the embedded nut 2409. The main control module 700 has a built-in processor for receiving signals from the current transformer 1100, voltage module 600, micro switch 400, etc., and controlling the silicon carbide control module 2600 according to preset logic to realize intelligent opening and closing and protection.

[0058] like Figure 2 As shown, the power module 800 is locked to the base 2400 by screw 2500 and the embedded nut 2408, which is used to provide working power for the display and control module 500, the main control module 700, the silicon carbide control module 2600, etc.

[0059] like Figure 2 As shown, the energy absorption module 1500 is inserted into the central cavity 2403 from the front of the base 2400 and locked to the base 2400 by the embedded nut 2407. The energy absorption module 1500 is connected in parallel to both ends of the silicon carbide module 1400. It is connected to the input side and output side of the silicon carbide module 1400 respectively through the power take-off bus (900) to absorb the overvoltage (energy) generated by the stray inductance on the main line (or bus) when the silicon carbide module 1400 is turned off, thus protecting the silicon carbide module 1400.

[0060] like Figure 1 and Figure 11 As shown, the display and control module 500 has a built-in display screen for receiving and displaying information such as current, voltage, and fault status sent by the main control module 700 in real time. The display and control module 500 is locked to the mounting hole 102 of the faceplate 100 by screws 2500; square button caps 200 and round button caps 300 are respectively installed on the buttons 501 (there are several) of the display and control module 500. Users can use the square button caps 200 and round button caps 300 to set parameters (such as overcurrent threshold, opening and closing delay, etc.) and perform manual closing / opening operations.

[0061] like Figure 2As shown, the silicon carbide control module 2600 is located between the base 2400 and the cover plate 2800, and is locked to the base 2400 by screw 3100 and the embedded nut 2413. The silicon carbide control module 2600 is electrically connected to the silicon carbide module 1400 and is used to drive and control the conduction and shutdown of the silicon carbide module 1400. The signal input terminal of the silicon carbide control module 2600 is connected to the control signal output terminal of the main control module 700 through a ribbon cable. The drive output terminal of the silicon carbide control module 2600 is then connected to the control electrode of the silicon carbide module 1400 through a wire. The main control module 700 sends opening and closing commands to the silicon carbide control module 2600 according to preset logic, and the silicon carbide control module 2600 drives the silicon carbide module 1400 to conduction or shutdown accordingly.

[0062] The main control module 700, power supply module 800, and energy absorption module 1500 are sequentially mounted on step 2417 from the front to the back of the circuit breaker (from the cover 100 to the base 2400). The energy absorption module 1500 is located at the rear (closer to the back of the base 2400), and the silicon carbide module 1400 is located behind the energy absorption module 1500 (further rearward). The circuit board modules are electrically connected via ribbon cables and wires.

[0063] In addition, the solid-state circuit breaker also includes a power supply busbar 900, an arc-extinguishing chamber 2100, and a heat sink 2700.

[0064] like Figure 2 and Figure 10 As shown, the power tap 900 is mounted on the energy absorption module 1500 by screw 3100, and has a 901 on it. Screw 2900 passes through the central through hole 901 of the power tap 900 and the terminal block through hole 1302 of the positive contact assembly 1300 in sequence, locking the power tap 900 and the positive contact assembly 1300 onto the silicon carbide module 1400 (inlet terminal). One end of the power tap 900 is electrically connected to the terminal of the positive contact assembly 1300, and the other end is electrically connected to the inlet terminal of the silicon carbide module 1400, providing a current path for the energy absorption module 1500.

[0065] The arc-extinguishing chamber 2100 is installed in the upper cavity 2401 and is arranged adjacent to the stationary contact assembly 2000 (each stationary contact assembly 2000 and the corresponding moving contact assembly constitute a corresponding arc-extinguishing chamber 2100), which is used to extinguish any arcs that may be generated when the contact system is mechanically disconnected.

[0066] like Figure 2 and Figure 12As shown, the heat sink 2700 is fixed to the back of the base 2400 (located between the base 2400 and the cover plate 2800), and the silicon carbide module 1400 is locked onto the heat sink 2700 to provide a heat dissipation channel for the silicon carbide module 1400 and reduce its operating temperature.

[0067] like Figure 2 and Figure 4 As shown, upper slots 2415 are provided on both sides of the cavity for the stationary contact assembly 2000 within the upper cavity 2401. A front partition 2200 is installed within the upper slots 2415 to separate the terminals of the stationary contact assembly 2000 connected to the external power supply from the interior of the base 2400, thereby increasing the electrical safety distance. Lower slots 2416 are provided on both sides of the cavity for mounting the terminal block within the lower recess 2404. A rear partition 1000 is installed within the lower slots 2416 to separate the terminals of the terminal block connected to the load from the interior of the base 2400, thereby increasing the electrical safety distance.

[0068] This embodiment achieves miniaturization, high integration, and reliable isolation function of the circuit breaker through the layered cavity design of the base 2400, the horizontal compact layout of the silicon carbide module 1400, the stacked installation of each circuit board module (such as the main control module 700, the power supply module 800, and the energy absorption module 1500), and the direct triggering structure of the micro switch 400. Example 2

[0069] The difference between this embodiment and Embodiment 1 lies in the installation method of the silicon carbide module and the arrangement order of the circuit board.

[0070] In this embodiment, the silicon carbide module 1400 is not indirectly fixed via the heat sink 2700, but is directly connected to the silicon carbide control module 2600 via screws 2900 and then installed into the central cavity 2403. The heat sink 2700 is separately installed on the outer back of the base 2400 and contacts the silicon carbide module 1400 via a thermal pad. This structure is suitable for applications with lower heat dissipation requirements and can further reduce internal space requirements.

[0071] Meanwhile, the installation order of the main control module 700, power supply module 800, and energy absorption module 1500 is not fixed as "main control - power supply - absorption". Instead, it can be adjusted to a stacked order of "power supply - main control - absorption" according to electromagnetic compatibility requirements, as long as each module is still supported by the step 2417. In this embodiment, the power supply module 800 is located at the front (closest to the faceplate), the main control module 700 is in the middle, and the energy absorption module 1500 is located at the back.

[0072] All other unmentioned structures, connections, and working principles are the same as in Example 1. Example 3

[0073] The difference between this embodiment and Embodiment 1 lies in the installation position of the micro switch.

[0074] In this embodiment, the micro switch 400 is not fixed inside the faceplate 100, but is fixed on the side wall of the mechanism groove 2402 of the base 2400, located on the side of the lever 1701. A raised pressing part is provided on the lever 1701. When the lever 1701 rotates to a specific angle, the pressing part directly presses the roller 401 of the micro switch 400. This solution also achieves signal triggering without auxiliary parts and helps reduce wiring on the faceplate 100.

[0075] The remaining unmentioned structures and working principles are the same as in Example 1. Example 4

[0076] The difference between this embodiment and Embodiment 1 lies in the shape and arrangement of the button caps.

[0077] In this embodiment, the cover 100 has only two circular holes, and a circular button cap is installed in each of the two holes. One of the circular button caps has a raised dot or an annular groove on its top to distinguish the function. This simplified design is suitable for cost-sensitive scenarios where users are already familiar with the operating logic, while still achieving basic closing / opening control.

[0078] The remaining unmentioned structures and working principles are the same as in Example 1.

[0079] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0080] The scope of protection of this invention is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this invention shall fall within the scope of protection of this invention.

Claims

1. A solid-state circuit breaker with isolation function, comprising a base (2400), an operating mechanism (1700), a rotating shaft assembly (1900), a stationary contact assembly (2000), a moving contact assembly, a silicon carbide module (1400), and a terminal block; characterized in that: The base (2400) has an opening on the front and is provided with an upper cavity (2401), a mechanism groove (2402), a middle cavity (2403) and a lower groove (2404) inside the base (2400). The operating mechanism (1700) is installed in the mechanism groove (2402); The rotating shaft assembly (1900) is rotatably mounted in the operating mechanism (1700) and is linked with the operating mechanism (1700); The stationary contact assembly (2000) is fixed inside the upper cavity (2401); The moving contact assembly is mounted on the rotating shaft assembly (1900) and can separate from or contact the stationary contact assembly (2000) as the rotating shaft assembly (1900) rotates; The silicon carbide module (1400) is horizontally disposed within the central cavity (2403) and forms a compact layout with the moving contact assembly that is spatially layered and horizontally staggered. All the terminal blocks are placed in the lower groove (2404).

2. The solid-state circuit breaker with isolation function according to claim 1, characterized in that: The number of stationary contact assemblies (2000) is two, and they are respectively located on both sides inside the upper cavity (2401); The moving contact assembly includes a positive contact assembly (1300) and a negative contact assembly (1600). The positive contact assembly (1300) and the negative contact assembly (1600) are respectively installed at both ends of the rotating shaft assembly (1900) and correspond one-to-one with the two stationary contact assemblies (2000). The terminal block includes a positive terminal block (1200) and a terminal block (1601) that serves as a negative terminal block. The positive terminal block (1200), the positive contact assembly (1300), and the stationary contact assembly corresponding to the positive contact assembly (1300) are connected in series to form a positive circuit. The terminal block (1601), the negative contact assembly (1600), and the stationary contact assembly corresponding to the negative contact assembly (1600) are connected in series to form a negative circuit.

3. The solid-state circuit breaker with isolation function according to claim 2, characterized in that: It also includes a current transformer (1100), the head (1301) of the positive contact assembly (1300) passing through a pre-set center hole (1101) on the current transformer (1100).

4. The solid-state circuit breaker with isolation function according to claim 2, characterized in that: The middle cavity (2403) has steps (2417) on both sides inside, which are used to support and arrange multiple circuit board modules in a stacked manner. The multiple circuit board modules include a voltage module (600) and a main control module (700), a power supply module (800) and an energy absorption module 1500, which are installed sequentially on the steps (2417) from front to back. The silicon carbide module (1400) is located on the back of the energy absorption module 1500. The voltage module (600) is installed in the middle cavity 2405 of the upper cavity (2401). The middle cavity 2405 is located between two stationary contact assemblies.

5. The solid-state circuit breaker with isolation function according to claim 4, characterized in that: It also includes a cover plate (2800), a silicon carbide control module (2600), and a heat sink (2700); the cover plate (2800) is locked to the back of the base (2400); the silicon carbide control module (2600) and the heat sink (2700) are disposed between the cover plate (2800) and the base (2400); the silicon carbide module (1400) is fixed on the heat sink (2700), and passes through the rectangular hole (2406) preset on the back of the base (2400) and is inserted into the central cavity (2403), and is limited to the groove surface (2411) preset on the back of the base (2400).

6. The solid-state circuit breaker with isolation function according to claim 5, characterized in that: It also includes a power take-off block (900); the power take-off block (900) is installed on the energy absorption module (1500); the power take-off block (900) and the positive electrode contact assembly (1300) are fastened to the silicon carbide control module (2600) by fasteners and are both electrically connected to the silicon carbide control module (2600).

7. The solid-state circuit breaker with isolation function according to claim 1, characterized in that: It also includes a faceplate (100); the faceplate (100) is locked at the front opening of the base (2400); a square hole (103) and a round hole (104) are provided on the front of the faceplate (100), a square button cap (200) is installed in the square hole (103), a round button cap (300) is installed in the round hole (104), and the round hole (104) is arranged vertically on the right side of the faceplate (100); a display and control module (500) is fixed on the inside of the faceplate (100), and the square button cap (200) and the round button cap (300) are respectively installed on the button (501) of the display and control module (500).

8. The solid-state circuit breaker with isolation function according to claim 7, characterized in that: It also includes a micro switch (400) fixed inside the faceplate (100); the operating mechanism (1700) has a lever (1701), the micro switch (400) is disposed on the side of the lever (1701), and when the lever (1701) rotates, its side wall directly contacts or disengages from the roller (401) of the micro switch (400).

9. The solid-state circuit breaker with isolation function according to claim 7, characterized in that: It also includes an arc-extinguishing chamber (2100), a front partition (2200), and a rear partition (1000); the arc-extinguishing chamber (2100) is installed in the upper cavity (2401) and is arranged adjacent to the stationary contact assembly (2000); an upper slot (2415) is provided on both sides of the cavity for the stationary contact assembly (2000) in the upper cavity (2401), and the front partition (2200) is installed in the upper slot (2415); at the same time, a lower slot (2416) is provided on both sides of the cavity for installing the terminal block in the lower groove (2404), and the rear partition (1000) is installed in the lower slot (2416).

10. The solid-state circuit breaker with isolation function according to claim 7, characterized in that: It also includes a handle (1800), which is mounted on the operating mechanism (1700) for manually driving the rotating shaft assembly (1900) to rotate to achieve the isolation function, and the end of the handle (1800) extends out of the face cover (100) from a preset hole on the face cover (100).

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