An integrated overload protection leakage protection control circuit board

Abstract

The utility model discloses an integrated overload protection's electric leakage protection control circuit board, including the shell, the shell inner wall upper surface is rectangular distribution and is installed with the buckle lever, the shell is dismantled and is installed with the circuit board, and the circuit board upper surface one end is equipped with the protection component, and the circuit board lower surface center is welded with the main control chip, and the shell both sides are all set up and have the wire hole, and the circuit board upper surface is also rectangular distribution and is equipped with the buckle groove, and the circuit board is connected with the buckle lever buckle connection through the buckle groove and makes its installation in the shell. The utility model discloses quick response trouble problem that the circuit board occurred in the use process, can cut off the power supply when trouble occurs, improves the safety reliability.

Description

Technical Field

[0001] This utility model belongs to the field of circuit board technology, specifically relating to a leakage current protection control circuit board with integrated overload protection. Background Technology

[0002] In various electrical systems, leakage current and overload are common safety hazards. Leakage current can easily cause safety accidents, while overload can cause the circuit to overheat, leading to equipment damage or even fire.

[0003] Traditional leakage current protection and overload protection are often implemented by different devices or circuits, resulting in problems such as large size, high cost, and low reliability. Therefore, leakage current protection control circuit boards that integrate overload protection have emerged, which can integrate these two protection functions into a single circuit board to achieve comprehensive and efficient protection of electrical systems.

[0004] The main drawback of the protection structure of most circuit boards is that:

[0005] 1. Insufficient response speed and reliability, high risk of electric shock, slow response of circuit board protection structure, which easily leads to electric shock accidents;

[0006] 2. The heat dissipation effect is limited. After prolonged use, the circuit board temperature becomes too high, which leads to a decrease in component performance and even component burnout. Utility Model Content

[0007] The purpose of this invention is to provide a leakage current protection control circuit board with integrated overload protection, so as to solve the technical defects of existing control circuit boards, such as insufficient reliability of overload protection and poor heat dissipation leading to performance degradation.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A leakage current protection control circuit board with integrated overload protection includes a housing, with latching rods installed in a rectangular pattern on the upper surface of the inner wall of the housing, and a circuit board installed inside the housing. A protection component is provided at one end of the upper surface of the circuit board, and a main control chip is soldered to the center of the lower surface of the circuit board.

[0010] Both sides of the outer casing have wire holes for passing power cables and signal cables. The upper surface of the circuit board also has rectangular slots for locking. The circuit board is connected to the locking rod through the slots and is installed inside the casing.

[0011] As a preferred embodiment of this utility model, one end of the outer shell is provided with a socket, and an aluminum heat sink is inserted into the socket. The upper surface of the aluminum heat sink is provided with a fitting groove that matches the shape of the main control chip. The aluminum heat sink is inserted into the outer shell through the socket, so that the main control chip is embedded in the fitting groove and fits tightly. The upper surface of the aluminum heat sink is coated with thermal grease.

[0012] As a preferred embodiment of this utility model, a magnetic latching relay is installed at the center of the upper surface of the circuit board, the coil pins of the magnetic latching relay are soldered to the surface of the circuit board, and a thyristor is provided at the other end of the upper surface of the circuit board. The thyristor is connected in parallel with the magnetic latching relay, and the main control chip is connected to the protection components, the magnetic latching relay and the thyristor through the vias provided on the circuit board.

[0013] As a preferred embodiment of this utility model, the protection component includes a protection module, which includes a current detection unit and a leakage current detection unit. The current detection unit is a Hall sensor, and the leakage current detection unit is a zero-sequence current transformer. The protection module is soldered to the other end of the upper surface of the circuit board and connected to the main control chip through copper foil traces.

[0014] As a further embodiment of this utility model, the upper surface of the protection module is provided with two sets of grooves, in which plugs are inserted. A shielding plate is fixedly connected to the upper surface of the plugs. The shielding plate is made of conductive metal material and is covered with an insulating layer to shield external electromagnetic interference.

[0015] Compared with existing technologies, the leakage current protection control circuit board with integrated overload protection provided by this utility model has the following beneficial effects:

[0016] 1. This utility model can quickly respond to circuit board faults during use and can quickly cut off the power supply when a fault occurs, thereby improving safety and reliability;

[0017] 2. This utility model can effectively avoid the problem of component burnout caused by slow temperature drop, ensure reliability in the heat dissipation process, and extend its service life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only examples of embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of the aluminum heat sink in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the main control chip in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the magnetic latching relay in an embodiment of this utility model;

[0023] Figure 5 This is a schematic diagram of the protective component in an embodiment of the present invention.

[0024] Figure label:

[0025] 1. Outer shell; 101. Cable hole; 102. Clip rod; 103. Insertion hole; 104. Aluminum heat sink; 105. Fitting groove;

[0026] 2. Circuit board; 201. Clip slot;

[0027] 3. Main control chip; 301. Magnetic latching relay; 302. Silicon control unit (SCR);

[0028] 4. Protection components; 401. Protection module; 402. Shielding plate; 403. Insert block. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0030] In the description of the embodiments of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0031] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0032] See appendix Figures 1-5 As shown, an embodiment of the present invention provides a leakage protection control circuit board with integrated overload protection, including a housing 1. The upper surface of the inner wall of the housing 1 is provided with a rectangular arrangement of latching rods 102. A circuit board 2 is installed inside the housing 1. A protection component 4 is provided at one end of the upper surface of the circuit board 2. A main control chip 3 is soldered to the center of the lower surface of the circuit board 2.

[0033] Both sides of the outer casing 1 are provided with wire holes 101 for passing power cables and signal cables. The upper surface of the circuit board 2 is also provided with rectangularly distributed snap-fit ​​slots 201. The circuit board 2 is installed in the outer casing 1 by snap-fitting the snap-fit ​​slots 201 and the snap-fit ​​rod 102.

[0034] One end of the outer casing 1 has a socket 103, into which an aluminum heat sink 104 is inserted. The upper surface of the aluminum heat sink 104 has a fitting groove 105 that matches the shape of the main control chip 3. The aluminum heat sink 104 is inserted into the outer casing 1 through the socket 103, so that the main control chip 3 is embedded in the fitting groove 105 and fits tightly. Thermal grease is applied to the upper surface of the aluminum heat sink 104. A magnetic latching relay 301 is mounted at the center of the upper surface of the circuit board 2. The coil pins of the magnetic latching relay 301 are soldered to the surface of the circuit board 2. A thyristor 302 is provided at the other end of the upper surface of the circuit board 2. The thyristor 302 is connected in parallel with the magnetic latching relay 301. The main control chip 3 is connected to the protection component 4, the magnetic latching relay 301, and the thyristor 302 through a via provided in the circuit board 2.

[0035] To improve the performance of circuit board 2, when an overload or leakage occurs, the protection component 4 detects the signal and transmits the leakage and overload signals to the main control chip 3 via copper foil traces. The main control chip 3 analyzes the signal type and severity, prioritizing leakage. In the event of leakage, the main control chip 3 immediately triggers the thyristor 302 to quickly cut off the circuit and simultaneously drives the magnetic latching relay 301 to disconnect, physically isolating the faulty line and preventing electric shock risk. This also prevents reignition, effectively improving electrical safety and personnel safety. Subsequently, when handling overload, the main control chip 3 activates inverse time protection. After the timeout, the magnetic latching relay 301 is triggered to disconnect, preventing the line from overheating and catching fire. This provides effective protection and avoids the problem of slow leakage protection response leading to damage to circuit board 2. Furthermore, it is easy to install and maintain, and convenient to disassemble and repair, thereby reducing the incidence of safety accidents caused by electrical faults.

[0036] To further improve heat dissipation, the aluminum heat sink 104 is inserted into the socket 103 on one side of the housing 1, so that the aluminum heat sink 104 is attached to the surface of the main control chip 3 on the lower surface of the circuit board 2. The upper surface of the aluminum heat sink 104 is coated with thermal grease, which can effectively prevent the component from burning out due to slow temperature drop.

[0037] See appendix Figures 4 to 5As shown, the protection component 4 includes a protection module 401, which comprises a current detection unit and a leakage current detection unit. The current detection unit is a Hall sensor, and the leakage current detection unit is a zero-sequence current transformer. The protection module 401 is soldered to the other end of the upper surface of the circuit board 2 and connected to the main control chip 3 via copper foil traces. The upper surface of the protection module 401 has two sets of grooves, into which inserts 403 are inserted. A shielding plate 402 is fixedly connected to the upper surface of the inserts 403. The shielding plate 402 is made of conductive metal and covered with an insulating layer to shield against external electromagnetic interference. The Hall sensor and zero-sequence current transformer in the protection module 401 can be of the AllegroACS712ELCTR-30A-T type and TDKZCAT2035 0930, respectively, and the magnetic latching relay 301 is of the Omron G5R type.

[0038] To improve the overload and leakage protection capabilities of circuit board 2 during use, protection module 401 consists of a Hall sensor and a zero-sequence current transformer. The Hall sensor can provide overload protection for circuit board 2, while the zero-sequence current transformer in protection module 401 can provide leakage protection to ensure the safety of circuit board 2 during use. When a person comes into contact with a leakage device, the leakage current flows to the ground through the person. After the transformer detects the current difference, it triggers tripping to cut off the power supply, thereby preventing electric shock. Subsequently, continuous leakage caused by aging of the circuit or insulation damage may cause high temperature or electric arc. The transformer cuts off the power supply in time to avoid the fault from expanding, thereby improving the response speed and enhancing safe use.

[0039] To improve the signal's interference resistance, the shielding plate 402 installed on the protection module 401 can effectively reduce the harm caused by electromagnetic interference, reduce false triggering and false tripping, and ensure that the protection module 401 is not affected during use. The polyimide insulating layer on the surface of the shielding plate 402 can prevent the metal shielding layer from short-circuiting with other parts of the circuit board 2, and at the same time prevent users from touching conductive parts and causing risks.

[0040] It is worth noting that the main control chip 3 can be combined with a leakage protection chip to achieve highly reliable and low-cost integrated overload protection and leakage protection functions.

[0041] When an overload or leakage occurs, the protection component 4 detects the signal and transmits the leakage and overload signals to the main control chip 3 through copper foil traces. The main control chip 3 analyzes the signal type and severity, prioritizing leakage. In the event of leakage, the main control chip 3 immediately triggers the thyristor 302 to quickly cut off the circuit, and simultaneously drives the magnetic latching relay 301 to disconnect, physically isolating the faulty line to avoid the risk of electric shock and prevent reignition, effectively improving electrical safety and personnel safety. When handling overload, the main control chip 3 activates inverse time protection, triggering the magnetic latching relay 301 to disconnect after the timeout, preventing the line from overheating and catching fire. This provides effective protection and avoids the problem of slow leakage protection response leading to damage to the circuit board 2. Furthermore, it is easy to install and maintain, and convenient to disassemble and repair, thereby reducing the incidence of safety accidents caused by electrical faults.

[0042] In summary, this utility model embodiment provides a leakage current protection control circuit board with integrated overload protection. The overall structure can quickly respond to faults that occur on the circuit board during use. When a fault occurs, it can quickly cut off the power supply, improve safety and reliability, effectively avoid component burnout caused by slow temperature drop, ensure reliability during heat dissipation, and extend its service life.

[0043] The foregoing has shown and described the basic principles of the present invention. The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. The above embodiments and descriptions in the specification are only illustrative of the principles of the present invention. Any modifications, equivalent substitutions, and improvements made within the scope of the present invention without departing from the scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A leakage current protection control circuit board with integrated overload protection, comprising a housing (1), characterized in that: The upper surface of the inner wall of the outer shell (1) is equipped with buckle rods (102) arranged in a rectangular pattern. A circuit board (2) is installed inside the outer shell (1). A protective component (4) is provided at one end of the upper surface of the circuit board (2). A main control chip (3) is welded to the center of the lower surface of the circuit board (2). The outer casing (1) has wire holes (101) on both sides, through which power lines and signal lines are passed. The upper surface of the circuit board (2) is also provided with snap-fit ​​grooves (201) in a rectangular pattern. The circuit board (2) is connected to the snap-fit ​​rod (102) through the snap-fit ​​grooves (201) so that it is installed inside the outer casing (1).

2. The leakage current protection control circuit board with integrated overload protection according to claim 1, characterized in that: The outer casing (1) has a socket (103) at one end, and an aluminum heat sink (104) is inserted into the socket (103). The upper surface of the aluminum heat sink (104) has a fitting groove (105) that matches the shape of the main control chip (3). The aluminum heat sink (104) is inserted into the outer casing (1) through the socket (103), so that the main control chip (3) is embedded in the fitting groove (105) and fits tightly. The upper surface of the aluminum heat sink (104) is coated with thermal grease.

3. The leakage current protection control circuit board with integrated overload protection according to claim 1, characterized in that: A magnetic latching relay (301) is installed at the center of the upper surface of the circuit board (2). The coil pin of the magnetic latching relay (301) is soldered to the surface of the circuit board (2). A thyristor (302) is provided at the other end of the upper surface of the circuit board (2). The thyristor (302) is connected in parallel with the magnetic latching relay (301). The main control chip (3) is connected to the protection component (4), the magnetic latching relay (301), and the thyristor (302) through the vias provided on the circuit board (2).

4. The leakage current protection control circuit board with integrated overload protection according to claim 1, characterized in that: The protection component (4) includes a protection module (401), which includes a current detection unit and a leakage detection unit. The current detection unit is a Hall sensor, and the leakage detection unit is a zero-sequence current transformer. The protection module (401) is soldered to the other end of the upper surface of the circuit board (2) and connected to the main control chip (3) through copper foil traces.

5. A leakage current protection control circuit board with integrated overload protection according to claim 4, characterized in that: The upper surface of the protection module (401) is provided with two sets of grooves, and a plug (403) is inserted into the groove. A shielding plate (402) is fixedly connected to the upper surface of the plug (403). The shielding plate (402) is made of conductive metal material and is covered with an insulating layer to shield external electromagnetic interference.

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