Direct-current bus overvoltage protection device

Abstract

The utility model relates to the technical field of bus protection, in particular to a DC bus overvoltage protection device, which comprises a protection main body, and is characterized in that the outer surface of the protection main body is fixedly connected with a bus interface, the front surface of the protection main body is fixedly connected with a voltage detector, the top of the voltage detector is fixedly connected with a transmission line, and the transmission line is fixedly connected with a power supply. The end, away from the voltage detector, of the transmission line is fixedly connected with a digital signal processor, the end, away from the bus interface, of the protection body is fixedly connected with a protection unit, a bus is connected, the voltage detector can detect the voltage of the bus in real time, and voltage information is transmitted to the digital signal processor. Once an overvoltage condition is detected, a control instruction is sent out according to pre-compiled program logic, and the protection unit is controlled to cut off the current.

Description

Technical Field

[0001] This utility model relates to the field of busbar protection technology, specifically a DC busbar overvoltage protection device. Background Technology

[0002] A DC bus is a conductor that collects and distributes DC power in a DC power supply system or an electrical system containing DC links. It acts like an energy "highway," connecting various DC power sources (such as battery packs and rectifiers) and numerous DC loads (such as DC motors and electronic devices). Through the DC bus, the DC power generated by the power source can be efficiently transmitted to each load, enabling multiple power sources to power the load together or achieving energy sharing among loads. It plays a crucial role in many fields, including industrial automation, renewable energy power generation systems, and electric vehicle charging infrastructure.

[0003] When providing overvoltage protection for a DC bus, the moving contact may bounce at the moment of contact with the stationary contact due to factors such as mechanical inertia and elastic deformation. The moving contact may come into contact with and separate from the stationary contact multiple times before closing stably. Contact bounce can cause the circuit to be switched on and off multiple times in a short period of time, generating an electric arc and aggravating the burning of the contact. Utility Model Content

[0004] The purpose of this invention is to provide a DC bus overvoltage protection device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: it includes a protection body, a bus interface is fixedly connected to the outer surface of the protection body, a voltage detector is fixedly connected to the front of the protection body, a transmission line is fixedly connected to the top of the voltage detector, a digital signal processor is fixedly connected to the end of the transmission line away from the voltage detector, and a protection unit is fixedly connected to the end of the protection body away from the bus interface.

[0006] The protection unit includes an outer casing, an iron core fixedly connected to the top of the inner wall of the outer casing, a coil sleeved on the outer surface of the iron core, a wire fixedly connected to the outer surface of the coil, the end of the wire away from the coil being fixedly connected to the outer surface of a digital signal processor, a support plate fixedly connected to the bottom of the inner wall of the outer casing, a circuit board fixedly connected to the inner wall of the support plate, an anti-bounce mechanism fixedly connected to the top of the circuit board, a second wire fixedly connected to the outer surface of the circuit board, and an output terminal fixedly connected to the end of the circuit board away from the second wire.

[0007] Preferably, the outer surface of the outer casing is fixedly connected to the end of the protective body away from the busbar interface, and the end of the second wire away from the circuit board is fixedly connected to the outer surface of the protective body.

[0008] Preferably, the anti-bounce mechanism includes a stationary contact plate, with baffles symmetrically arranged on the top of the stationary contact plate, a frame plate fixedly connected to the top of the circuit board, a telescopic spring fixedly connected to the top of the frame plate, an armature fixedly connected to the bottom of the telescopic spring, a movable contact plate fixedly connected to the bottom of the armature, and a limit mechanism fixedly connected to the inner wall of the armature.

[0009] Preferably, the limiting mechanism includes a support rod, a sliding plate is slidably connected to the outer surface of the support rod, a miniature cylinder is fixedly connected to the bottom of the sliding plate, a base plate is fixedly connected to the bottom of the miniature cylinder, and a limiting plate is fixedly connected to the top of the sliding plate.

[0010] Preferably, the bottom of the stationary contact plate is fixedly connected to the top of the circuit board, and the bottom of the support rod is fixedly connected to the inner wall of the armature.

[0011] Compared with the prior art, the beneficial effects of this utility model are: when the armature is attracted, the moving contact plate may bounce at the moment of contact with the stationary contact plate due to mechanical inertia, elastic deformation and other factors. That is to say, the moving contact may come into contact with and separate from the stationary contact multiple times before closing stably. The limiting mechanism will prevent the moving contact plate from separating at the moment of contact with the stationary contact plate, thereby preventing the bouncing phenomenon. Attached Figure Description

[0012] Figure 1 This is the front view of the present utility model.

[0013] Figure 2 This is a cross-sectional view of the present invention.

[0014] Figure 3 This is a schematic diagram of the protection unit structure of this utility model.

[0015] Figure 4 This is a partial structural schematic diagram of the protection unit of this utility model.

[0016] Figure 5 This is a schematic diagram of the anti-bounce mechanism of this utility model.

[0017] Figure 6 This is a schematic diagram of the limiting mechanism of this utility model.

[0018] In the diagram: 1. Protective body; 2. Busbar interface; 3. Voltage detector; 4. Transmission line; 5. Protective shell; 6. Digital signal processor; 7. Protection unit; 71. Outer shell; 72. Iron core; 73. Coil; 74. Wire 1; 75. Support plate 1; 76. Circuit board; 77. Anti-bounce mechanism; 78. Wire 2; 79. Output end; 771. Stationary contact plate; 772. Frame plate; 773. Telescopic spring; 774. Armature; 775. Baffle plate; 776. Moving contact plate; 777. Limiting mechanism; 7771. Support rod; 7772. Sliding plate; 7773. Miniature cylinder; 7774. Base plate; 7775. Limiting plate. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1 to 6 This utility model provides a technical solution:

[0021] The device includes a protection body 1, a bus interface 2 fixedly connected to the outer surface of the protection body 1, a voltage detector 3 fixedly connected to the front of the protection body 1, a transmission line 4 fixedly connected to the top of the voltage detector 3, a protective shell 5 fixedly connected to the top of the protection body 1, a digital signal processor 6 fixedly connected to the end of the transmission line 4 away from the voltage detector 3, and a protection unit 7 fixedly connected to the end of the protection body 1 away from the bus interface 2.

[0022] When this utility model is in operation, the bus needs to be connected to the bus interface 2. The voltage detector 3 will detect the voltage of the bus in real time and transmit the voltage information to the digital signal processor 6. Once an overvoltage situation is detected, a control command will be issued according to the pre-written program logic, and the protection unit 7 will be controlled to cut off the current.

[0023] The protection unit 7 includes an outer casing 71, an iron core 72 fixedly connected to the top of the inner wall of the outer casing 71, a coil 73 sleeved on the outer surface of the iron core 72, a wire 74 fixedly connected to the outer surface of the coil 73, the end of the wire 74 away from the coil 73 fixedly connected to the outer surface of the digital signal processor 6, a support plate 75 fixedly connected to the bottom of the inner wall of the outer casing 71, a circuit board 76 fixedly connected to the inner wall of the support plate 75, an anti-bounce mechanism 77 fixedly connected to the top of the circuit board 76, a wire 78 fixedly connected to the outer surface of the circuit board 76, and an output terminal 79 fixedly connected to the end of the circuit board 76 away from the wire 78.

[0024] Current enters the circuit board 76 through wire 2 78 and flows from the circuit board 76 to the output terminal 79. When it is necessary to cut off the current, the anti-bounce mechanism 77 will block the current.

[0025] The outer surface of the outer casing 71 is fixedly connected to the end of the protective body 1 away from the busbar interface 2, and the end of the second wire 78 away from the circuit board 76 is fixedly connected to the outer surface of the protective body 1.

[0026] The anti-bounce mechanism 77 includes a stationary contact plate 771, with a stop plate 775 symmetrically arranged on the top of the stationary contact plate 771. A frame plate 772 is fixedly connected to the top of the circuit board 76. A telescopic spring 773 is fixedly connected to the top of the frame plate 772. An armature 774 is fixedly connected to the bottom of the telescopic spring 773. A movable contact plate 776 is fixedly connected to the bottom of the armature 774. A limit mechanism 777 is fixedly connected to the inner wall of the armature 774.

[0027] When the DC bus voltage exceeds the set threshold, a control signal is sent to the coil 73. This signal is usually a DC current of sufficient strength to enable the coil 73 to generate a sufficient magnetic field. The current in the coil 73 generates a magnetic field, which attracts the armature 774 and compresses the telescopic spring 773. The movement of the armature 774 causes the moving contact 776 connected to it to separate from the original stationary contact 771, thereby blocking the current.

[0028] The limiting mechanism 777 includes a support rod 7771, a sliding plate 7772 slidably connected to the outer surface of the support rod 7771, a micro cylinder 7773 fixedly connected to the bottom of the sliding plate 7772, a base plate 7774 fixedly connected to the bottom of the micro cylinder 7773, and a limiting plate 7775 fixedly connected to the top of the sliding plate 7772.

[0029] After the voltage is restored, the magnetic field generated by coil 73 disappears, and armature 774 moves downward. At this time, the telescopic rod is in the extended state. Then, during the subsequent movement of armature 774, base plate 7774 will contact circuit board 76 and cause sliding plate 7772 to move upward first, and finally drive the top of limit plate 7775 to abut the bottom of stop plate 775. Thus, the mechanical inertia and elastic deformation of telescopic spring 773 will cause moving contact plate 776 to contact and separate from stationary contact plate 771 multiple times before it is stably closed.

[0030] The bottom of the stationary contact plate 771 is fixedly connected to the top of the circuit board 76, and the bottom of the support rod 7771 is fixedly connected to the inner wall of the armature 774.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A DC bus overvoltage protection device, comprising a protection body (1), characterized in that: The outer surface of the protection body (1) is fixedly connected to a bus interface (2), the front of the protection body (1) is fixedly connected to a voltage detector (3), the top of the voltage detector (3) is fixedly connected to a transmission line (4), the top of the protection body (1) is fixedly connected to a protective shell (5), the end of the transmission line (4) away from the voltage detector (3) is fixedly connected to a digital signal processor (6), and the end of the protection body (1) away from the bus interface (2) is fixedly connected to a protection unit (7). The protection unit (7) includes an outer casing (71), an iron core (72) is fixedly connected to the top of the inner wall of the outer casing (71), a coil (73) is sleeved on the outer surface of the iron core (72), a wire (74) is fixedly connected to the outer surface of the coil (73), and the end of the wire (74) away from the coil (73) is fixedly connected to the outer surface of the digital signal processor (6). A support plate (75) is fixedly connected to the bottom of the inner wall of the outer casing (71), a circuit board (76) is fixedly connected to the inner wall of the support plate (75), an anti-bounce mechanism (77) is fixedly connected to the top of the circuit board (76), a wire (78) is fixedly connected to the outer surface of the circuit board (76), and an output terminal (79) is fixedly connected to the end of the circuit board (76) away from the wire (78).

2. The DC bus overvoltage protection device according to claim 1, characterized in that: The outer surface of the outer casing (71) is fixedly connected to the end of the protective body (1) away from the busbar interface (2), and the end of the second wire (78) away from the circuit board (76) is fixedly connected to the outer surface of the protective body (1).

3. The DC bus overvoltage protection device according to claim 1, characterized in that: The anti-bounce mechanism (77) includes a stationary contact plate (771), with a stop plate (775) symmetrically arranged on the top of the stationary contact plate (771), a frame plate (772) fixedly connected to the top of the circuit board (76), a telescopic spring (773) fixedly connected to the top of the frame plate (772), an armature (774) fixedly connected to the bottom of the telescopic spring (773), a moving contact plate (776) fixedly connected to the bottom of the armature (774), and a limit mechanism (777) fixedly connected to the inner wall of the armature (774).

4. A DC bus overvoltage protection device according to claim 3, characterized in that: The limiting mechanism (777) includes a support rod (7771), a sliding plate (7772) is slidably connected to the outer surface of the support rod (7771), a miniature cylinder (7773) is fixedly connected to the bottom of the sliding plate (7772), a base plate (7774) is fixedly connected to the bottom of the miniature cylinder (7773), and a limiting plate (7775) is fixedly connected to the top of the sliding plate (7772).

5. A DC bus overvoltage protection device according to claim 4, characterized in that: The bottom of the static contact plate (771) is fixedly connected to the top of the circuit board (76), and the bottom of the support rod (7771) is fixedly connected to the inner wall of the armature (774).

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