Short circuit prevention circuit device

Abstract

The utility model provides an anti-short circuit device comprising a main body assembly which comprises a circuit board, an HDMI interface, a TVS diode, a self-recovery fuse, a temperature sensor and a microcontroller. The HDMI interface, the TVS diode, the self-recovery fuse, the temperature sensor and the microcontroller are all installed on the upper surface of the circuit board. According to the utility model, when short circuit occurs, the self-recovery fuse cuts off a current path by rapidly increasing resistance and timely limits the damage of abnormal current to equipment, and the TVS diode rapidly absorbs surge voltage at the moment of short circuit at a nanosecond-level response speed and clamps the voltage in a safe range, thereby effectively protecting power supply and signal pins of the HDMI interface and improving the reliability of the HDMI interface. Compared with the prior art, not only is the short circuit risk caused by mistakenly inserting the Type-C line into the HDMI interface reduced, but also faults such as element burning and chip breakdown can be reduced, the safety and reliability of equipment are remarkably improved, the maintenance cost is reduced, and meanwhile, heat in the device can be quickly discharged in cooperation with the heat dissipation assembly.

Description

Technical Field

[0001] This utility model relates to a circuit device, specifically a short-circuit protection circuit device, belonging to the technical field of short-circuit protection devices. Background Technology

[0002] The pin definitions and functions of HDMI and Type-C interfaces are completely different. HDMI interfaces are primarily used for transmitting high-definition video and audio signals, and their gold fingers correspond to different signal channels, power, and ground pins. Type-C interfaces are more universal and can be used for charging, data transfer, video output, and other functions. When a Type-C cable is plugged into an HDMI interface, some pins of the HDMI interface may form unexpected circuit connections through the pins of the Type-C cable. If these connections cause power pins to conduct with signal pins or ground pins that should not be directly connected, a short circuit will occur.

[0003] If an HDMI port short-circuits due to a mis-insertion of a Type-C port, it will first directly impact the related hardware. The abnormal current generated by the short circuit may burn out the internal circuit components of the HDMI port, and may even further affect the motherboard or other connecting components, causing the device to malfunction, resulting in problems such as a black screen or no signal output. Furthermore, a short circuit can also pose safety hazards. Abnormal current may not only damage the equipment, but may also cause overheating, smoke, or even fire, threatening the personal safety and property of users. Therefore, a short-circuit protection circuit device is proposed. Utility Model Content

[0004] In view of this, the present invention provides a short-circuit protection device to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial option.

[0005] The technical solution of this utility model embodiment is implemented as follows: a short-circuit protection circuit device includes a main component, the main component including a circuit board, an HDMI interface, a TVS diode, a self-resetting fuse, a temperature sensor and a microcontroller;

[0006] The HDMI interface, TVS diode, resettable fuse, temperature sensor, and microcontroller are all mounted on the top surface of the circuit board.

[0007] The pins of the HDMI interface are connected in series with a self-resetting fuse and in parallel with a TVS diode via a circuit board.

[0008] A heat dissipation assembly is provided on the top of the circuit board. The heat dissipation assembly includes a protective cover, two side plates, a through slot, and a cooling fan.

[0009] The two side plates are symmetrically fixed to the lower surface of the protective cover, the through slots are equidistantly opened inside the side plates, and the cooling fan is installed inside the protective cover.

[0010] More preferably, the lower surfaces of the two side plates are symmetrically attached to the upper surface of the circuit board, and the lower surfaces of the side plates are symmetrically provided with connection holes.

[0011] More preferably, a connecting screw is provided inside the connecting hole.

[0012] More preferably, the upper surface of the circuit board has symmetrically formed mounting holes, the positions of which correspond to the positions of the connection holes.

[0013] More preferably, the connecting screw is located inside the mounting hole.

[0014] More preferably, a protective net is fixedly connected to the upper surface of the protective cover.

[0015] More preferably, the position of the protective net corresponds to the position of the cooling fan.

[0016] More preferably, the TVS diode, resettable fuse, temperature sensor, and microcontroller are all located below the protective cover.

[0017] The present invention has the following advantages due to the adoption of the above technical solution:

[0018] This invention achieves short-circuit protection through the combination of a self-resetting fuse and a TVS diode. In the event of a short circuit, the self-resetting fuse quickly increases its resistance to cut off the current path, effectively limiting the damage of abnormal current to the equipment. It also automatically recovers after the fault is cleared, eliminating the need for manual replacement. Meanwhile, the TVS diode rapidly absorbs the surge voltage at the moment of the short circuit, clamping the voltage within a safe range and effectively protecting the power supply and signal pins of the HDMI interface. The combination of the self-resetting fuse and the TVS diode not only reduces the risk of short circuits caused by incorrect insertion of a Type-C cable into the HDMI interface but also reduces component burnout and chip breakdown, significantly improving the safety and reliability of the equipment. It also extends the equipment's lifespan, reduces maintenance costs, and, in conjunction with a heat dissipation component, quickly dissipates heat from inside the device.

[0019] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an overall structural diagram of the present invention;

[0022] Figure 2 This is an exploded view of the structure of this utility model;

[0023] Figure 3 This is a structural diagram of the heat dissipation component of this utility model;

[0024] Figure 4 This is an exploded view of the heat dissipation component structure of this utility model.

[0025] Reference numerals: 101, Main component; 11, Circuit board; 12, HDMI interface; 13, TVS diode; 14, Self-resetting fuse; 15, Temperature sensor; 16, Microcontroller; 17, Mounting hole; 301, Heat dissipation component; 31, Protective cover; 32, Side plate; 33, Through slot; 34, Protective mesh; 35, Cooling fan; 36, Connecting screw; 37, Connecting hole. Detailed Implementation

[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0027] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0028] like Figures 1-4 As shown, this utility model embodiment provides a short-circuit protection circuit device, including a main component 101, which includes a circuit board 11, an HDMI interface 12, a TVS diode 13, a self-resetting fuse 14, a temperature sensor 15, and a microcontroller 16.

[0029] The HDMI interface 12, TVS diode 13, self-resetting fuse 14, temperature sensor 15 and microcontroller 16 are all mounted on the upper surface of the circuit board 11.

[0030] The pins of the HDMI interface 12 are connected in series with a self-resetting fuse 14 and in parallel with a TVS diode 13 via the circuit board 11.

[0031] With the above design, when the Type-C plug is mistakenly inserted into the HDMI interface 12, the power supply can be cut off by the self-resetting fuse 14 and the voltage can be clamped by the TVS diode 13, which minimizes the damage of short circuit and plays a role in preventing short circuit.

[0032] Short-circuit protection is achieved through the cooperation of the self-resetting fuse 14 and the TVS diode 13. In the event of a short circuit, the self-resetting fuse 14 quickly increases its resistance to cut off the current path, thereby limiting the damage of abnormal current to the equipment. It can also automatically recover after the fault is cleared without manual replacement. Meanwhile, the TVS diode 13 quickly absorbs the surge voltage at the moment of the short circuit and clamps the voltage within a safe range, effectively protecting the power supply and signal pins of the HDMI interface 12. The two complement each other, which not only reduces the risk of short circuit caused by the incorrect insertion of the Type-C cable into the HDMI interface 12, but also reduces the risk of component burnout and chip breakdown, significantly improving the safety and reliability of the equipment, while extending the service life of the equipment and reducing maintenance costs.

[0033] A heat dissipation assembly 301 is provided on the top of the circuit board 11. The heat dissipation assembly 301 includes a protective cover 31, two side plates 32, a through slot 33 and a cooling fan 35.

[0034] Two side plates 32 are symmetrically fixed to the lower surface of the protective cover 31. Through slots 33 are equidistantly opened inside the side plates 32, and cooling fans 35 are installed inside the protective cover 31.

[0035] When the self-resetting fuse 14 and TVS diode 13 are working, they will generate a certain amount of heat. The temperature sensor 15 can monitor the temperature. When the rated value is reached, the microcontroller 16 controls the cooling fan 35 to work. When the cooling fan 35 is working, air flows from all sides to the bottom of the protective cover 31 and then is discharged from the top of the protective cover 31, thereby accelerating the air flow speed and achieving the effect of heat dissipation and cooling.

[0036] The signal terminals of temperature sensor 15 and cooling fan 35 are both connected to the signal terminals of microcontroller 16; the model of temperature sensor 15 is TMP75BIDR, and the microcontroller 16 is a single-chip microcomputer, model STM32F101VBT6.

[0037] In this invention, the HDMI interface 12, TVS diode 13, self-resetting fuse 14, temperature sensor 15, microcontroller 16 and cooling fan 35 are all existing technologies, so their internal structure, working principle and connection control method will not be described in detail.

[0038] In one embodiment, the lower surfaces of the two side plates 32 are symmetrically attached to the upper surface of the circuit board 11. The lower surfaces of the side plates 32 are symmetrically provided with connection holes 37, and connection screws 36 are provided inside the connection holes 37. The upper surface of the circuit board 11 is symmetrically provided with mounting holes 17, and the positions of the mounting holes 17 correspond to the positions of the connection holes 37. The connection screws 36 are located inside the mounting holes 17. When the device is installed as a whole, the circuit board 11 is installed inside the electronic device by means of the connection screws 36. At the same time, the connection screws 36 can fix the position of the side plates 32.

[0039] In one embodiment, a protective net 34 is fixedly connected to the upper surface of the protective cover 31. The position of the protective net 34 corresponds to the position of the cooling fan 35. The protective net 34 can protect the cooling fan 35 and prevent the cooling fan 35 from being damaged during transportation or use.

[0040] In one embodiment, the TVS diode 13, the self-resetting fuse 14, the temperature sensor 15, and the microcontroller 16 are all located below the protective cover 31. The protective cover 31 and the two side plates 32 can form a protective shield structure, thereby protecting the electronic components on the surface of the circuit board 11.

[0041] When this utility model is in operation: when the Type-C plug is mistakenly inserted into the HDMI interface 12, the self-resetting fuse 14 cuts off the power supply and the TVS diode 13 clamps the voltage, thereby minimizing the damage of short circuits and avoiding safety hazards caused by short circuits.

[0042] Meanwhile, the temperature sensor 15 monitors the temperature inside the device. When the temperature reaches the rated value, the microcontroller 16 controls the cooling fan 35 to work. When the cooling fan 35 works, air flows into the lower part of the protective cover 31 from all sides and then is discharged from the top of the protective cover 31, thereby accelerating the air flow speed and achieving the effect of heat dissipation and cooling.

[0043] Compared to existing technologies, this invention achieves short-circuit protection through the cooperation of a self-resetting fuse 14 and a TVS diode 13. In the event of a short circuit, the self-resetting fuse 14 quickly increases its resistance to cut off the current path, thereby limiting the damage of abnormal current to the equipment. It can also automatically recover after the fault is cleared without manual replacement. Meanwhile, the TVS diode 13 quickly absorbs the surge voltage at the moment of the short circuit, clamping the voltage within a safe range and effectively protecting the power supply and signal pins of the HDMI interface 12. At the same time, in conjunction with the heat dissipation component 301, the heat inside the device can be quickly dissipated.

[0044] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A short-circuit protection device, comprising a main component (101), characterized in that: The main component (101) includes a circuit board (11), an HDMI interface (12), a TVS diode (13), a self-resetting fuse (14), a temperature sensor (15), and a microcontroller (16). The HDMI interface (12), TVS diode (13), resettable fuse (14), temperature sensor (15), and microcontroller (16) are all mounted on the upper surface of the circuit board (11). The pins of the HDMI interface (12) are connected in series with the self-resetting fuse (14) and in parallel with the TVS diode (13) through the circuit board (11). A heat dissipation assembly (301) is provided above the circuit board (11). The heat dissipation assembly (301) includes a protective cover (31), two side plates (32), a through slot (33), and a heat dissipation fan (35). The two side plates (32) are symmetrically fixed to the lower surface of the protective cover (31), the through slots (33) are equidistantly opened inside the side plates (32), and the cooling fan (35) is installed inside the protective cover (31).

2. The short-circuit protection device according to claim 1, characterized in that: The lower surfaces of the two side plates (32) are symmetrically attached to the upper surface of the circuit board (11), and the lower surfaces of the side plates (32) are symmetrically provided with connection holes (37).

3. The short-circuit protection device according to claim 2, characterized in that: A connecting screw (36) is provided inside the connecting hole (37).

4. A short-circuit protection device according to claim 3, characterized in that: The upper surface of the circuit board (11) is symmetrically provided with mounting holes (17), and the position of the mounting holes (17) corresponds to the position of the connecting holes (37).

5. A short-circuit protection device according to claim 4, characterized in that: The connecting screw (36) is located inside the mounting hole (17).

6. The short-circuit protection device according to claim 1, characterized in that: A protective net (34) is fixedly connected to the upper surface of the protective cover (31).

7. A short-circuit protection device according to claim 6, characterized in that: The position of the protective net (34) corresponds to the position of the cooling fan (35).

8. A short-circuit protection device according to claim 1, characterized in that: The TVS diode (13), the self-resetting fuse (14), the temperature sensor (15), and the microcontroller (16) are all located below the protective cover (31).

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