Onboard lightning protection device and circuit structure thereof

Abstract

The utility model discloses an onboard lightning protection device and a circuit structure thereof, the onboard lightning protection device comprises a shell, a circuit board, a first discharge tube group, a second discharge tube group, a third discharge tube group and a tripping assembly, the first discharge tube group, the second discharge tube group and the third discharge tube group are arranged on the circuit board, and the first discharge tube group, the second discharge tube group and the third discharge tube group are respectively provided with a plurality of discharge tubes which are connected in series; the tripping assembly comprises a metal contact elastic piece and a reset piece. The metal contact elastic piece enables the first discharge tube set and the second discharge tube set to be connected in parallel and then is connected with the third discharge tube set in series. And the metal contact spring is connected with the first discharge tube group and the second discharge tube group in a low-temperature tin welding manner. The lightning protection device integrates the multi-stage discharge tube and the capacitor, improves the voltage resistance of the circuit, eliminates the residual voltage peak, and protects the equipment. The high-speed optocoupler enhances the response speed, and the rectifier bridge capacitor filter circuit ensures a stable direct-current power supply, so that stable operation of remote signaling communication of the lightning protection device is ensured.

Description

Technical Field

[0001] This utility model relates to the field of lightning protection facilities, and in particular to an onboard lightning arrester and its circuit structure. Background Technology

[0002] In modern power systems and electronic equipment, surge protectors play a crucial role, protecting equipment from damage caused by lightning strikes. Currently, microswitches are widely used as a key component of surge protectors. Microswitches, with their small size and fast response, play a vital role in surge protectors. However, some problems in the existing technology urgently need to be addressed.

[0003] First, the application of microswitches in surge protectors in existing technologies suffers from degraded remote signaling output. This means that over time and with increased usage, the remote signaling output performance of the microswitch gradually declines, affecting the normal operation of the surge protector. Furthermore, when two or more microswitches are used in series, the contact resistance increases exponentially with the number of switches, even reaching the hundreds of ohms level, severely impacting the conductivity and efficiency of the surge protector.

[0004] Secondly, microswitches are highly sensitive to soldering temperature during production. Excessively high soldering temperatures can easily damage the microswitches, increasing production costs and affecting product reliability and stability. When using terminals in the soldering tank, they must be placed in a +235℃ soldering tank at the specified speed, time, and depth. The terminals should not be loose, and the insulation distance should remain unchanged. When using terminals with a soldering iron, the recommended tip temperature should not exceed 320℃, and the soldering time should be controlled within 3 seconds.

[0005] Furthermore, the contact resistance of a microswitch is one of its important electrical performance parameters. Contact resistance varies with the contact force; it becomes more stable (decreases) when the contact force increases, and conversely, it becomes unstable (increases) when the contact force decreases. This indicates that the contact resistance of a microswitch has a direct impact on its performance, and the contact resistance issue in existing technologies limits the effectiveness of microswitches in surge protectors.

[0006] In summary, existing microswitches used as components of surge protectors suffer from problems such as degraded remote signaling output, increased contact resistance, and sensitivity to welding temperatures. These issues limit the performance and reliability of surge protectors. Therefore, it is necessary to develop a novel surge protector technology to overcome the limitations of existing technologies and improve the stability and efficiency of surge protectors. Utility Model Content

[0007] In view of this, the present invention addresses the deficiencies of existing technologies, and its main objective is to provide an onboard surge protector and its circuit structure. This surge protector integrates multi-stage discharge tubes and capacitors to improve circuit withstand voltage, eliminate residual voltage spikes, and protect equipment. High-speed optocouplers enhance response speed, and the rectifier bridge capacitor filter circuit ensures a stable DC power supply, guaranteeing stable operation of the surge protector's remote communication.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An onboard surge protector includes a housing, a circuit board, a first discharge tube group, a second discharge tube group, a third discharge tube group, and a tripping assembly mounted on the circuit board. The first, second, and third discharge tube groups each have multiple discharge tubes connected in series. The tripping assembly includes a metal contact spring and a reset element. The metal contact spring connects the first and second discharge tube groups in parallel and then connects them in series with the third discharge tube group. The connections between the metal contact spring and the first and second discharge tube groups are all low-temperature soldered connections.

[0010] As a preferred embodiment: the metal contact spring includes a first contact end, a second contact end, and an intermediate contact end, the first contact end, the second contact end, and the intermediate contact end are integrally connected to each other, and the first contact end and the second contact end are symmetrically located on both sides of the intermediate contact end; the connection between the first contact end and the first discharge tube group and the connection between the second contact end and the second discharge tube group are both low-temperature tin soldered connections; the intermediate contact end is fixedly connected to the third discharge tube group.

[0011] As a preferred embodiment: the housing is provided with two hook posts, and the reset member is two tension springs, one of which is connected between one hook post and the first contact end; the other tension spring is connected between the other hook post and the second contact end.

[0012] As a preferred embodiment: the metal contact spring is wavy, the middle contact end includes a pin fixing part and a contact part, the contact part is welded and fixed to the third discharge tube group, and the pin fixing part is inserted into the circuit board.

[0013] As a preferred embodiment: the circuit board is provided with a first electrode plate, a second electrode plate and a third electrode plate, the first electrode plate is connected to the rear end of the first discharge tube group, the second electrode plate is connected to the rear end of the second discharge tube group, the third electrode plate is connected to the rear end of the third discharge tube group, and the first electrode plate, the second electrode plate and the third electrode plate extend out of the housing; and the third electrode plate is connected to the ground terminal.

[0014] As a preferred embodiment, at least one capacitor is connected in parallel across the second to last discharge tubes in the first, second, and third discharge tube groups.

[0015] A circuit structure for use in the aforementioned onboard surge protector includes a first discharge diode group, a second discharge diode group, a third discharge diode group, a tripping assembly, a rectifier bridge, a filter capacitor, a high-speed optocoupler, and a remote signaling terminal. One end of the first discharge diode group is connected to the L terminal, and the other end is connected to the tripping assembly. One end of the second discharge diode group is connected to the N terminal, and the other end is connected to the tripping assembly. One end of the third discharge diode group is connected to the tripping assembly, and the other end is connected to the PE terminal. The rectifier bridge is connected to the remote signaling terminal through the filter capacitor and the high-speed optocoupler. One input terminal of the rectifier bridge is connected to the N terminal, and the other input terminal is connected to the first discharge diode group through the tripping assembly.

[0016] As a preferred embodiment, one input terminal of the rectifier bridge is connected to the N terminal via a first current-limiting resistor.

[0017] As a preferred embodiment, a second current-limiting resistor is connected between the filter capacitor and the high-speed optocoupler.

[0018] As a preferred embodiment, it also includes a third current-limiting resistor, which is connected in parallel with the first discharge tube group.

[0019] Compared with existing technologies, this invention has significant advantages and beneficial effects. Specifically, as shown in the above technical solution, by integrating the circuit board, the first discharge tube group, the second discharge tube group, the third discharge tube group, and the tripping assembly into a housing to form an onboard surge protector, this surge protector improves the circuit's withstand voltage through the cooperation of multiple discharge tubes and multiple capacitors. It also effectively eliminates residual voltage in the circuit, promptly fuses circuit connections, and protects electrical equipment. Furthermore, the high-speed optocoupler provides a faster response speed, improving the surge protector's response efficiency to surge voltages. The rectifier bridge capacitor filter circuit provides a more stable DC power supply, which is crucial for the stable operation of the surge protector. The capacitor filter smooths the pulsating DC voltage after rectification, reducing voltage fluctuations and thus providing a more stable and reliable power supply for the surge protector.

[0020] To more clearly illustrate the structural features and effects of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the plate-mounted surge protector of this utility model;

[0022] Figure 2 This is a three-dimensional schematic diagram of the plate-mounted surge protector of this utility model from another perspective.

[0023] Figure 3 This is an exploded perspective view of the plate-mounted surge protector of this utility model;

[0024] Figure 4 This is an exploded perspective view of the circuit board and base of this utility model;

[0025] Figure 5 This is an exploded perspective view of the circuit board and base of this utility model.

[0026] Figure 6 This is a three-dimensional structural diagram of the circuit board of this utility model;

[0027] Figure 7 This is a schematic diagram of the circuit structure principle of this utility model.

[0028] Explanation of reference numerals in the attached diagram:

[0029] 10. Housing; 11. Hook post; 12. Upper housing; 13. Base; 20. Circuit board; 21. First electrode plate; 22. Second electrode plate; 23. Third electrode plate; 30. First discharge tube group; 40. Second discharge tube group; 50. Third discharge tube group; 60. Tripping assembly; 61. Metal contact spring; 611. First contact end; 612. Second contact end; 613. Intermediate contact end; 614. Pin fixing part; 615. Contact part; 62. Reset component; 70. Discharge tube; 80. Capacitor; U1. Rectifier bridge; C. Filter capacitor; U2. High-speed optocoupler; YD. Remote signaling terminal; R1. First current limiting resistor; R2. Second current limiting resistor; R3. Third current limiting resistor. Detailed Implementation

[0030] This utility model is as follows Figures 1 to 7 As shown, an onboard surge protector and its circuit structure are disclosed. The onboard surge protector includes a housing 10, a circuit board 20, a first discharge tube group 30, a second discharge tube group 40, a third discharge tube group 50, and a tripping assembly 60 mounted on the circuit board 20, wherein:

[0031] The housing 10 includes an upper housing 12 and a base 13 installed at the lower end of the upper housing 12.

[0032] The first discharge tube group 30, the second discharge tube group 40, and the third discharge tube group 50 each have multiple discharge tubes 70 connected in series; the tripping assembly 60 includes a metal contact spring 61 and a reset member 62. The metal contact spring 61 connects the first discharge tube group 30 and the second discharge tube group 40 in parallel and then connects them in series with the third discharge tube group 50; and the connection between the metal contact spring 61 and the first discharge tube group 30 and the second discharge tube group 40 is a low-temperature tin solder connection. When the temperature reaches the low-temperature tin melting point, the connection will break to protect the electrical equipment connected in the circuit.

[0033] The metal contact spring 61 includes a first contact end 611, a second contact end 612, and an intermediate contact end 613. The first contact end 611, the second contact end 612, and the intermediate contact end 613 are integrally connected to each other, and the first contact end 611 and the second contact end 612 are symmetrically located on both sides of the intermediate contact end 613. The connection between the first contact end 611 and the first discharge tube group 30 and the connection between the second contact end 612 and the second discharge tube group 40 are both low-temperature tin soldered connections. The intermediate contact end 613 is fixedly connected to the third discharge tube group 50. The housing 10 is provided with two hook posts 11, and the reset member 62 is two tension springs, one of which is connected between one of the hook posts 11 and the first contact end 611; the other tension spring is connected between the other hook post 11 and the second contact end 612; the reset member 62 provides elastic tension for the first contact end 611 and the second contact end 612 to disengage from the third discharge tube group 50. When the low-temperature tin at the connection melts, the reset member 62 pulls the first contact end 611 and the second contact end 612 away from the third discharge tube group 50.

[0034] The metal contact spring 61 is wavy, which reduces space occupation and reduces the contact area at the connection between the first contact end 611 and the second contact end 612 and the third discharge tube 50, facilitating timely disconnection under the drive of the reset component. The intermediate contact end 613 includes a pin fixing part 614 and a contact part 615. The contact part 615 is welded and fixed to the third discharge tube group 50, and the pin fixing part 614 is inserted into the circuit board 20. The cooperation between the pin fixing part 614 and the contact part 615 improves the connection stability between the intermediate contact end 613 and the third discharge tube group 50.

[0035] The circuit board 20 is provided with a first electrode plate 21, a second electrode plate 22, and a third electrode plate 23. The first electrode plate 21 is connected to the rear end of the first discharge tube group 30, the second electrode plate 22 is connected to the rear end of the second discharge tube group 40, and the third electrode plate 23 is connected to the rear end of the third discharge tube group 50. The first electrode plate 21, the second electrode plate 22, and the third electrode plate 23 extend out of the housing 10 to be used for corresponding connection of the L terminal, N terminal, and PE terminal of the circuit. The first electrode plate 21 is connected to the L terminal, the second electrode plate 22 is connected to the N terminal, and the third electrode plate 23 is connected to the PE ground terminal.

[0036] In the first discharge tube group 30, the second discharge tube group 40 and the third discharge tube group 50, at least one capacitor 80 is connected in parallel across the second to last discharge tube 70. The surge voltage charges the capacitor 80. When the voltage reaches the breakdown voltage of the discharge tube 70, the discharge tubes 70 connected in parallel across the capacitor 80 are broken down step by step, forming a connection path to the third discharge tube group 50.

[0037] A circuit structure applied to the onboard surge protector includes a first discharge tube group 30, a second discharge tube group 40, a third discharge tube group 50, a tripping assembly 60, a rectifier bridge U1, a filter capacitor C, a high-speed optocoupler U2, and a remote signaling terminal YD. One end of the first discharge tube group 30 is connected to the L terminal, and the other end is connected to the tripping assembly 60. One end of the second discharge tube group 40 is connected to the N terminal, and the other end is connected to the tripping assembly 60. One end of the third discharge tube group 50 is connected to the tripping assembly 60, and the other end is connected to the PE terminal. The rectifier bridge U1 is connected to the remote signaling terminal YD through the filter capacitor C and the high-speed optocoupler U2. One input terminal of the rectifier bridge U1 is connected to the N terminal, and the other input terminal is connected to the first discharge tube group 30 through the tripping assembly 60.

[0038] One input terminal of the rectifier bridge U1 is connected to the N terminal through a first current-limiting resistor R1; a second current-limiting resistor R2 is connected between the filter capacitor C and the high-speed optocoupler U2; the circuit structure also includes a third current-limiting resistor R3, which is connected in parallel with the first discharge tube group 30.

[0039] The working principle of this onboard surge protector is as follows: When the voltage is normal, the trip assembly 60 remains connected. When the L and N terminals are connected to the power supply, the current flows from the L and N terminals through the third current-limiting resistor R3, the first current-limiting resistor R1, and then through the trip assembly 60 to the input terminal of the rectifier bridge U1, converting AC to DC. The current is then filtered by the filter capacitor C to provide a stable voltage for the high-speed optocoupler U2, and then reaches the high-speed optocoupler U2 through the second current-limiting resistor R2. The remote signaling terminal YD is connected, allowing signal transmission and indicating that the circuit is normal.

[0040] When a surge arrives from one side of the circuit, the first discharge tube 70 of the first discharge tube group 30 is broken down by high voltage, forming a circuit. This charges the capacitor 80 connected in parallel across the terminals of the subsequent discharge tubes 70. The subsequent discharge tubes 70 sequentially form circuits when the capacitors 80 connected in parallel across them reach their breakdown voltage. Finally, the circuit passes through the tripping assembly 60 to the third discharge tube group 50. The third discharge tube group 50 operates on the same principle as the first discharge tube group 30, and it eliminates residual voltage in the circuit. As the surge voltage flows, the connection point (low-temperature soldering) between the first discharge tube group 30 and the third discharge tube group 50 melts as the temperature rises. The reset component 62 pulls the first contact terminal 611 away from the third discharge tube group 50, disconnecting the first and third discharge tube groups 30 from each other. With the L and N terminals disconnected, the electrical equipment is protected. The remote signaling terminal YD disconnects, resulting in no signal transmission, indicating that the circuit has been damaged by the surge. This allows for real-time monitoring of the circuit status and timely response. Similarly, when a surge arrives from the other side of the circuit (the second discharge tube group), the principle is the same, and will not be elaborated here.

[0041] The key design feature of this invention lies in integrating a circuit board, a first discharge tube group, a second discharge tube group, a third discharge tube group, and a tripping assembly into a housing to form an onboard surge protector. This surge protector, through the cooperation of multiple discharge tubes and capacitors, improves the circuit's withstand voltage and effectively eliminates residual voltage in the circuit, promptly melting circuit connections to protect electrical equipment. Furthermore, the high-speed optocoupler provides a faster response speed, improving the surge protector's response efficiency to surge voltages. The rectifier bridge capacitor filter circuit provides a more stable DC power supply, crucial for the stable operation of the surge protector. The capacitor filter smooths the pulsating DC voltage after rectification, reducing voltage fluctuations and thus providing a more stable and reliable power supply for the surge protector.

[0042] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. An onboard surge protector, characterized in that: The device includes a housing, a circuit board, a first discharge tube group, a second discharge tube group, a third discharge tube group mounted on the circuit board, and a tripping assembly. The first, second, and third discharge tube groups each have multiple discharge tubes connected in series. The tripping assembly includes a metal contact spring and a reset component. The metal contact spring connects the first and second discharge tube groups in parallel and then connects them in series with the third discharge tube group. The metal contact spring is connected to the first and second discharge tube groups by low-temperature soldering.

2. The plate-mounted surge protector according to claim 1, characterized in that: The metal contact spring includes a first contact end, a second contact end, and an intermediate contact end. The first contact end, the second contact end, and the intermediate contact end are integrally connected to each other, and the first contact end and the second contact end are symmetrically located on both sides of the intermediate contact end. The connection between the first contact end and the first discharge tube group and the connection between the second contact end and the second discharge tube group are both low-temperature tin soldered connections. The intermediate contact end is fixedly connected to the third discharge tube group.

3. The plate-mounted surge protector according to claim 2, characterized in that: The housing is provided with two hook posts, and the reset member is two tension springs, one of which is connected between one of the hook posts and the first contact end; the other tension spring is connected between the other hook post and the second contact end.

4. The plate-mounted surge protector according to claim 2, characterized in that: The metal contact spring is wavy, and the middle contact end includes a pin fixing part and a contact part. The contact part is welded and fixed to the third discharge tube group, and the pin fixing part is inserted into the circuit board.

5. The plate-mounted surge protector according to claim 1, characterized in that: The circuit board is provided with a first electrode plate, a second electrode plate, and a third electrode plate. The first electrode plate is connected to the rear end of the first discharge tube group, the second electrode plate is connected to the rear end of the second discharge tube group, and the third electrode plate is connected to the rear end of the third discharge tube group. The first, second, and third electrode plates extend out of the housing, and the third electrode plate is connected to the ground terminal.

6. The on-board surge protector according to claim 1, characterized in that: Each of the second to last discharge tubes in the first, second, and third discharge tube groups has at least one capacitor connected in parallel across its terminals.

7. A circuit structure applied to the onboard surge protector as described in any one of claims 1-6, characterized in that: The device includes a first discharge tube group, a second discharge tube group, a third discharge tube group, a tripping assembly, a rectifier bridge, a filter capacitor, a high-speed optocoupler, and a remote signaling terminal. One end of the first discharge tube group is connected to the L terminal, and the other end is connected to the tripping assembly. One end of the second discharge tube group is connected to the N terminal, and the other end is connected to the tripping assembly. One end of the third discharge tube group is connected to the tripping assembly, and the other end is connected to the PE terminal. The rectifier bridge is connected to the remote signaling terminal through the filter capacitor and the high-speed optocoupler. One input terminal of the rectifier bridge is connected to the N terminal, and the other input terminal is connected to the first discharge tube group through the tripping assembly.

8. The circuit structure of the onboard surge protector according to claim 7, characterized in that: One of the input terminals of the rectifier bridge is connected to the N terminal through a first current-limiting resistor.

9. The circuit structure of the onboard surge protector according to claim 7, characterized in that: A second current-limiting resistor is connected between the filter capacitor and the high-speed optocoupler.

10. The circuit structure of the onboard surge protector according to claim 7, characterized in that: It also includes a third current-limiting resistor, which is connected in parallel with the first discharge tube group.

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