Fireproof current limiting protector

Abstract

This utility model claims protection for a fire-resistant current-limiting protector, which includes a housing with a circuit cavity inside. An IGBT power module, a main board, and a neutral wire are housed within the circuit cavity. Both ends of the IGBT power module extend outside the circuit cavity via conductive busbars, forming the live wire inlet and outlet on the housing. Similarly, both ends of the neutral wire extend outside the circuit cavity via conductive busbars, forming the neutral wire inlet and outlet on the housing. The live wire inlet is located above the live wire outlet, and the neutral wire inlet is located above the neutral wire outlet. The main board is connected to the conductive busbars on the IGBT power module via a circuit transformer and is used to measure the current on the conductive busbars. The main board is also connected to the IGBT power module via a driver chip and is used to control the on / off state of the IGBT power module. This application uses an IGBT power module instead of the existing MOSFET as a switch for short-circuit current-limiting protection, achieving a response speed in the microsecond range.

Description

Technical Field

[0001] This utility model relates to the field of electrical fire protection technology, specifically a fire-resistant current limiting protector. Background Technology

[0002] Fire-resistant current-limiting protectors are widely used in shopping malls, warehouses, hotels, and other places, serving as effective devices for protecting people's lives and property. Traditional electrical fire-resistant current-limiting protectors use MOSFETs for switching control, but MOSFETs are complex to weld, have poor heat dissipation, and slow response speeds. Therefore, how to improve the overall effectiveness of fire-resistant current-limiting protectors is the technical problem that this application aims to solve. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model proposes a fireproof current limiting protector that uses an IGBT power module as a switch to achieve rapid on / off switching. The top-in, bottom-out connection method makes the protector easier to use, and the top-in, bottom-out fan cooling cavity improves heat dissipation.

[0004] The technical solution of this utility model is as follows: A fire-resistant current limiting protector includes a housing with a circuit cavity inside. An IGBT power module, a main board, and a neutral wire are disposed inside the circuit cavity. The two ends of the IGBT power module extend to the outside of the circuit cavity through conductive bars, thereby forming an inlet and an outlet of the live wire on the housing. The two ends of the neutral wire extend to the outside of the circuit cavity through conductive bars, thereby forming an inlet and an outlet of the neutral wire on the housing. The inlet of the live wire is located above the outlet of the live wire, and the inlet of the neutral wire is located above the outlet of the neutral wire. The motherboard is connected to the busbar on the IGBT power module via a circuit transformer to measure the current on the busbar. The motherboard is also connected to the IGBT power module via a driver chip to control the switching on and off of the IGBT power module.

[0005] In summary, the above technical solution has the following beneficial effects: Existing current limiting protectors use MOSFETs for switching control, with a response speed in the millisecond range. This application uses IGBT power modules to replace the existing MOSFETs as switches for short-circuit current limiting protection, achieving a response speed in the microsecond range. The fireproof current limiting protector is designed with an appropriate installation structure based on the IGBT power module and adopts a top-in, bottom-out wiring method, separating the input and output ends at a greater distance, thereby avoiding accidental contact due to loose wires. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the housing of a fireproof current limiting protector; Figure 2 This is a schematic diagram of the circuit cavity of a fireproof current limiting protector; Figure 3 A schematic diagram of an IGBT power module for a fire-resistant current limiting protector; Figure 4 This is a schematic diagram of the heat sink component of a fireproof current limiting protector.

[0007] Reference numerals: 10, housing; 11, circuit cavity; 12, partition; 13, heat dissipation cavity; 14, heat dissipation vent; 15, mounting hole; 20, IGBT power module; 30, main board; 40, neutral wire; 50, conductor bar; 60, fan; 70, heat sink; 71, heat sink block; 72, heat sink fin; 80, terminal block; 81, fixing screw; 82, movable screw. Detailed Implementation

[0008] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0009] A fire-resistant current-limiting protector includes a housing 10, within which a circuit cavity 11 is formed. An IGBT power module 20, a main board 30, and a neutral conductor 40 are disposed within the circuit cavity 11. Both ends of the IGBT power module 20 extend outside the circuit cavity 11 via conductive busbars 50, thus forming a live wire inlet and outlet on the housing 10. Similarly, both ends of the neutral conductor 40 extend outside the circuit cavity 11 via conductive busbars 50, forming a neutral wire inlet and outlet on the housing 10. The live wire inlet is located above the live wire outlet, and the neutral wire inlet is located above the neutral wire outlet. The main board 30 is connected to the conductive busbars 50 on the IGBT power module 20 via a circuit transformer and is used to measure the current on the conductive busbars 50. The main board 30 is also connected to the IGBT power module 20 via a driver chip and is used to control the on / off state of the IGBT power module 20. Existing current limiting protectors use MOSFETs for switching control, with a response speed in the millisecond range. This application uses an IGBT power module 20 to replace the existing MOSFETs as switches for short-circuit current limiting protection, achieving a response speed in the microsecond range. The fireproof current limiting protector is designed with an appropriate installation structure based on the IGBT power module 20 and adopts a top-in, bottom-out wiring method, separating the input and output ends at a distance to avoid accidental contact due to loose wires.

[0010] The IGBT power module 20 is a power module composed of insulated-gate bipolar transistors (IGBTs). Since the IGBT module has a MOSFET structure, the gate of the IGBT is electrically isolated from the emitter through an oxide film. The IGBT power module 20 features voltage-controlled operation, high input impedance, low drive power, simple control circuitry, low switching losses, fast switching speed, high operating frequency, large component capacity, and good heat dissipation. Its integrated module package allows for quick connection to the motherboard 30 via a connector, thereby improving installation efficiency.

[0011] The housing 10 is equipped with an interactive panel connected to the motherboard 30, including input buttons and a display interface. The motherboard collects the current passing through the busbar 50 through a current transformer to determine whether it exceeds a preset current value. If it exceeds the preset current value, it indicates an open circuit, and then controls the IGBT power module 20 to disconnect via the drive module.

[0012] The housing 10 also has a heat dissipation cavity 13, which is located behind the circuit cavity 11. The heat dissipation cavity 13 and the circuit cavity 11 are separated by a partition 12, and the IGBT power module 20 is mounted in contact with the partition 12. A fan 60 and a heat sink 70 are installed inside the heat dissipation cavity 13. The heat sink 70 is mounted in contact with the partition 12. Both the upper and lower ends of the heat dissipation cavity 13 have heat dissipation vents 14 that communicate with the outside. The fan 60 drives the airflow inside the heat dissipation cavity 13 through the two heat dissipation vents 14. The IGBT power module 20 and the heat sink 70 are respectively located on both sides of the partition 12, so that the heat of the IGBT power module 20 can be quickly conducted to the heat sink 70. The fan 60 allows air to enter from one heat dissipation vent 14 and exit from the other heat dissipation vent 14, thereby carrying away the heat on the heat sink 70 and cooling the IGBT power module 20.

[0013] The heat dissipation cavity 13 has two heat dissipation vents 14, one at the top and one at the bottom. The heat dissipation component 70 includes a heat dissipation block 71 and several heat dissipation fins 72. The heat dissipation block 71 is attached to the partition plate 12, and the heat dissipation fins 72 are arranged at equal intervals on the heat dissipation block 71. The panels of each heat dissipation fin 72 extend vertically. There are heat dissipation gaps between each heat dissipation fin 72 to allow airflow. Each heat dissipation gap is vertical. The fan 60 is located at one heat dissipation vent 14 and blows air to the other heat dissipation vent 14. This allows the air entering through the heat dissipation vent 14 to pass through the heat dissipation gaps and then exit through the other heat dissipation vent 14. This increases the contact area between the air and the heat dissipation fins 72, thereby better dissipating heat from the IGBT power module 20 through the heat dissipation component 70.

[0014] The live wire input terminal formed by the IGBT power module 20 is above the live wire output terminal, and the neutral wire input terminal formed by the neutral conductor 40 is above the neutral wire output terminal. The existing fire protection device of this application adopts a top-in, bottom-out wiring mode, which separates the input and output terminals at a greater distance from the housing 10, thereby providing better isolation between the input and output terminals and enhancing safety.

[0015] The housing 10 is provided with a corresponding terminal block 80 at each inlet and outlet end. The conductive busbars 50 at the inlet and outlet ends are fixed to the terminal block 80 by fixing screws 81 and movable screws 82, respectively. The fixing screws 81 are used to fix the conductive busbars 50 and the terminal block 80, and the movable screws 82 are used to connect the external guide and the conductive busbars 50.

[0016] The IGBT power module 20 has three modules, each used to connect to one of the three live wires of a three-phase AC power supply.

[0017] Multiple fans 60 are provided. Preferably, three fans 60 are provided, each corresponding to one of the three IGBT power modules 20, and the three fans 60 and the three IGBT power modules 20 are aligned one-to-one.

[0018] The upper and lower edges of the housing 10 are provided with mounting holes 15 for screws to be fixed to the wall.

[0019] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A fireproof current limiter protector, characterized by, The device includes a housing (10), a circuit cavity (11) is provided inside the housing (10), an IGBT power module (20), a motherboard (30) and a neutral wire (40) are provided inside the circuit cavity (11), the two ends of the IGBT power module (20) extend to the outside of the circuit cavity (11) through conductive bus (50) respectively, thereby forming the live wire inlet and outlet on the housing (10), the two ends of the neutral wire (40) extend to the outside of the circuit cavity (11) through conductive bus (50) respectively, thereby forming the neutral wire inlet and outlet on the housing (10), the live wire inlet is located above the live wire outlet, and the neutral wire inlet is located above the neutral wire outlet; The motherboard (30) is connected to the busbar (50) on the IGBT power module (20) via a circuit transformer and is used to measure the current on the busbar (50). The motherboard (30) is connected to the IGBT power module (20) via a driver chip and is used to control the on / off state of the IGBT power module (20).

2. The fireproof current limiter protector according to claim 1, wherein, The housing (10) is also provided with a heat dissipation cavity (13), which is located behind the circuit cavity (11). The heat dissipation cavity (13) and the circuit cavity (11) are separated by a partition (12), and the IGBT power module (20) is attached to the partition (12). The heat dissipation cavity (13) is equipped with a fan (60) and a heat sink (70). The heat sink (70) is attached to the partition (12). The upper and lower ends of the heat dissipation cavity (13) are provided with heat dissipation ports (14) that communicate with the outside. The fan (60) drives the air circulation in the heat dissipation cavity (13) through the two heat dissipation ports (14).

3. The fire protective current limiter of claim 2, wherein, The heat dissipation cavity (13) has two heat dissipation ports (14), one on top and one on the bottom. The heat dissipation component (70) includes a heat dissipation block (71) and several heat dissipation fins (72). The heat dissipation block (71) is attached to the partition plate (12). Each heat dissipation fin (72) is arranged at equal intervals on the heat dissipation block (71). The panel of each heat dissipation fin (72) extends in the vertical direction.

4. The fire protective current limiter of claim 1, wherein, The live wire input terminal formed by the IGBT power module (20) is above the live wire output terminal, and the neutral wire input terminal formed by the neutral wire (40) is above the neutral wire output terminal.

5. A fire protection current limiter according to any one of claims 1 to 4, wherein The housing (10) is provided with a corresponding terminal block (80) at each inlet and outlet end. The conductive busbars (50) at the inlet and outlet ends are fixed to the terminal block (80) by fixing screws (81) and movable screws (82), respectively. The fixing screws (81) are used to fix the conductive busbars (50) and the terminal block (80), and the movable screws (82) are used to connect the external guide and the conductive busbars (50).

6. A fire protective current limiting protector according to any one of claims 1 to 4, wherein, The IGBT power module (20) is provided in three parts, which are used to connect the three live wires of the three-phase AC power.

7. The fire protective current limiter of claim 2, wherein, The fan (60) is provided in multiple units.

8. A fire protective current limiting protector according to any one of claims 1 to 4, wherein, The upper and lower edges of the housing (10) are provided with mounting holes (15) for screws to be fixed to the wall.

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