Power line protection device

Abstract

The utility model relates to a power line protection device. The power line protection device comprises an input end, a high-voltage protection circuit, a surge protection circuit and an output end, the input end is connected with the output end and the surge protection circuit through the high-voltage protection circuit, the surge protection circuit is grounded, and the output end is connected with the high-voltage protection circuit. Wherein the surge protection circuit is used for performing surge protection on transient overvoltage and / or transient overcurrent in input voltage of the input end; and the high-voltage protection circuit is used for switching on or switching off the connection between the input end and the output end and the surge protection circuit in response to the voltage value and the continuous state of the input voltage. By adopting the device, the high-voltage protection capability of the electronic product can be improved.

Description

Technical Field

[0001] This application relates to the field of voltage protection technology, and in particular to a power line protection device. Background Technology

[0002] In today's electronic product application environments, various types of cables are often intertwined, including high-speed and low-speed signal lines, and high-voltage and low-voltage signal lines. When high-voltage power lines cross over with low-voltage lines, it often damages the ports connected to the low-voltage lines, causing short circuits. Traditional protective measures are mostly used for power ports and employ large surge protectors, which are not suitable for electronic products.

[0003] It is evident that current electronic products still suffer from low high-voltage protection capabilities. Utility Model Content

[0004] Therefore, it is necessary to provide a power line protection device that can improve high-voltage protection capabilities to address the aforementioned technical problems.

[0005] In a first aspect, this application provides a power line protection device, which includes an input terminal, a high-voltage protection circuit, a surge protection circuit, and an output terminal. The input terminal is connected to the output terminal and the surge protection circuit through the high-voltage protection circuit, respectively. The surge protection circuit is grounded, wherein:

[0006] The surge protection circuit is used to provide surge protection against transient overvoltage and / or transient overcurrent in the input voltage at the input terminal.

[0007] The high-voltage protection circuit is used to connect or disconnect the input terminal from the output terminal and the surge protection circuit in response to the voltage level and duration of the input voltage.

[0008] In one embodiment, the high-voltage protection circuit includes a high-voltage fuse unit.

[0009] The input terminal is connected to the surge protection circuit via the high-voltage fuse unit;

[0010] The high-voltage fuse unit is used to adjust the current flowing through it by adjusting its own resistance value in response to the input voltage at the input terminal.

[0011] In one embodiment, the high-voltage protection circuit further includes an input switch and a fuse detection circuit, wherein the input terminal is connected to the high-voltage fuse unit via the input switch;

[0012] The input switch is used to control the connection between the input terminal and the high-voltage fuse unit;

[0013] The fuse detection circuit is used to detect the resistance value of the high-voltage fuse unit and control the on or off of the input switch based on the resistance value.

[0014] In one embodiment, the input terminal is connected to the output terminal in sequence via the input terminal switch and the high-voltage fuse unit.

[0015] In one embodiment, the high-voltage protection circuit further includes a first output switch, and the input terminal is connected to the output terminal in sequence through the input switch, the high-voltage fuse unit and the first output switch;

[0016] The fuse detection circuit is also used to detect the resistance value of the high-voltage fuse unit and control the first output terminal switch to be turned on or off based on the resistance value.

[0017] In one embodiment, the fuse detection circuit is connected to an external terminal, and the fuse detection circuit is also used to detect the resistance value of the high-voltage fuse unit and send the resistance value to the external terminal;

[0018] The first output switch and the input switch are also used to turn on or off based on the control of the external terminal.

[0019] In one embodiment, the input terminal is connected to the output terminal via the input terminal switch.

[0020] In one embodiment, the high-voltage protection circuit further includes a second output switch, and the input terminal is connected to the output terminal via the input switch and the second output switch in sequence;

[0021] The fuse detection circuit is also used to detect the resistance value of the high-voltage fuse unit and control the second output terminal switch to be turned on or off based on the resistance value.

[0022] In one embodiment, the fuse detection circuit is connected to an external terminal, and the fuse detection circuit is also used to detect the resistance value of the high-voltage fuse unit and send the resistance value to the external terminal;

[0023] The second output switch and the input switch are also used to turn on or off based on the control of the external terminal.

[0024] In one embodiment, the surge protection circuit includes a surge protection chip, and the high-voltage fuse unit is soldered to the surge protection chip.

[0025] The aforementioned power line protection device provides surge protection against transient overvoltages and / or transient overcurrents in the input voltage through a surge protection circuit. The high-voltage protection circuit responds to the voltage level and duration of the input voltage by connecting or disconnecting the input terminal from the output terminal and the surge protection circuit. This allows the surge protection circuit to handle non-sustained surge impacts, while the high-voltage protection circuit provides protection against continuous high voltage. Consequently, it provides a low-cost and compact protection device for electronic products, preventing power line bridging and port damage, and improving high-voltage protection capabilities. Attached Figure Description

[0026] Figure 1 This is a structural block diagram of a power line protection device in one embodiment;

[0027] Figure 2 This is a structural block diagram of a power line protection device in another embodiment;

[0028] Figure 3 This is a structural block diagram of a power line protection device in another embodiment;

[0029] Figure 4 This is a structural block diagram of a power line protection device in another embodiment;

[0030] Figure 5 A surge waveform diagram for surge protection in traditional technologies;

[0031] Figure 6 This is a surge waveform diagram under power line conditions in one embodiment;

[0032] Figure 7 This is a structural block diagram of a power line protection device in another embodiment. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0034] Based on the embodiments provided in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, some design, manufacturing, or production modifications based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0035] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0036] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application means two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The terms “first,” “second,” “third,” etc., used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0037] In one embodiment, such as Figure 1 As shown, a power line protection device is provided, comprising an input terminal 1, a high-voltage protection circuit 2, a surge protection circuit 3, and an output terminal 4. The input terminal 1 is connected to the output terminal 4 and the surge protection circuit 3 via the high-voltage protection circuit 2. The surge protection circuit 3 is grounded.

[0038] Surge protection circuit 3 is used to provide surge protection against transient overvoltage and / or transient overcurrent in the input voltage of input terminal 1;

[0039] The high voltage protection circuit 2 is used to connect or disconnect the input terminal 1 from the output terminal 4 and the surge protection circuit 3 in response to the high or low voltage value and the continuous state of the input voltage.

[0040] Input terminal 1 can be connected to an external power source or signal source to receive electrical energy or signals entering the device.

[0041] High-voltage protection circuit 2 is used to detect the input voltage level and, if necessary, disconnect or isolate the circuit to prevent overvoltage damage to internal electronic components. High voltage can be a voltage exceeding a set safety threshold, or a voltage higher than the withstand range of the downstream circuit connected to the output terminal. For example, when a voltage exceeding the safety threshold is detected, the connection to input terminal 1 is disconnected, thereby protecting downstream circuits from high-voltage damage. It is understood that input terminal 1 is connected to output terminal 4 and surge protection circuit 3 via high-voltage protection circuit 2. Therefore, when the connection between high-voltage protection circuit 2 and input terminal 1 is disconnected, continuous high voltage will not be transmitted to surge protection circuit 3 and output terminal 4, thus preventing high-voltage damage to downstream circuits.

[0042] The high-voltage protection circuit 2 can be implemented in various ways. For example, the high-voltage protection circuit 2 may include a control component, a controllable switch, and a voltage sensor. The input terminal 1 is connected to the surge protection circuit 3 and the output terminal 4 via the controllable switch. When the voltage value returned by the voltage sensor is higher than a set threshold, the control component controls the controllable switch to open, thereby disconnecting the connection to the input terminal 1. In another example, the high-voltage protection circuit 2 may include a resettable overcurrent protection element. Under high voltage conditions, the current also increases and exceeds a set current value, automatically increasing the resistance to achieve a state equivalent to disconnection, thereby limiting the current flow. Other protection circuits that control disconnection under high voltage conditions are also possible; this embodiment is not limited to any particular type.

[0043] Surge protection circuit 3, also known as transient voltage suppression circuit, is used to absorb or divert brief but potentially harmful high-energy pulses, such as transient high-energy pulses caused by lightning strikes, to protect connected equipment from transient overvoltages. Surge protection circuit 3 can be implemented using existing surge protection chips and provides a fast response to transient overvoltage and overcurrent phenomena.

[0044] Input terminal 1 can be the side of the protection device that provides a processed and stable voltage or signal to the subsequent circuit or load.

[0045] In this embodiment, input terminal 1 is connected to output terminal 4 and surge protection circuit 3 through high voltage protection circuit 2. It can be understood that when the voltage is within the normal low voltage range, high voltage protection circuit 2 acts as a path to allow current to pass through. Transient voltage pulses can be absorbed or transferred to the ground by surge protection circuit 3. When high voltage is continuously input to input terminal 1, high voltage protection circuit 2 disconnects from input terminal 1, thereby avoiding damage to surge protection circuit 3 and subsequent circuits of output terminal 4 caused by continuous high voltage.

[0046] This embodiment provides a power line protection device that uses a surge protection circuit to protect against transient overvoltages and / or transient overcurrents in the input voltage. The high-voltage protection circuit responds to the voltage level and duration of the input voltage by connecting or disconnecting the input terminal from the output terminal and the surge protection circuit. This allows the surge protection circuit to handle non-sustained surge impacts, while the high-voltage protection circuit provides protection against continuous high voltage. Therefore, this provides a low-cost and compact protection device for electronic products, preventing power line bridging and port damage, and improving high-voltage protection capabilities.

[0047] In one embodiment, the high-voltage protection circuit includes a high-voltage fuse unit.

[0048] The input terminal is connected to the surge protection circuit via a high-voltage fuse unit;

[0049] The high-voltage fuse unit is used to adjust the current flowing through it by adjusting its own resistance value in response to the input voltage at the input terminal.

[0050] The high-voltage fuse unit is an overcurrent protection unit that automatically cuts off the circuit when an abnormally high current is detected. The input terminal is connected to the surge protection circuit via the high-voltage fuse unit. Furthermore, the high-voltage fuse unit dynamically adjusts its resistance value based on the input voltage, thereby controlling the current flowing through it. When the input voltage is within the normal range, the high-voltage fuse unit can maintain a low resistance state, allowing current to flow smoothly.

[0051] When the input voltage suddenly increases, such as due to power fluctuations or a fault, the high-voltage fuse increases its resistance as the voltage rises, thereby limiting the current input to the surge protection circuit and the output. When the voltage exceeds the safety threshold, the high-voltage fuse can protect the circuit from permanent damage by disconnecting the connection or adjusting the resistance to the maximum.

[0052] This embodiment provides a power line protection device that, by adjusting the resistance value in a timely manner, can effectively prevent the impact of instantaneous high voltage on low voltage circuits by the high-voltage fuse unit, providing an extra layer of protection; by quickly cutting off excessive current, it reduces the risk of overheating and potential fire caused by overload, thereby improving the high-voltage protection capability.

[0053] In one embodiment, the high-voltage protection circuit further includes an input switch and a fuse detection circuit, with the input terminal connected to the high-voltage fuse unit via the input switch;

[0054] The input switch is used to control the connection between the input terminal and the high-voltage fuse unit;

[0055] The fuse detection circuit is used to detect the resistance value of the high-voltage fuse unit and control the on or off of the input switch based on the resistance value.

[0056] The input switch is a controllable switch that can control the connection between the input terminal and the high-voltage fuse unit based on control commands. The input switch can be implemented using relays, IGBT transistors, MOSFETs, etc.

[0057] The fuse detection circuit is used to detect the resistance value of the high-voltage fuse unit to identify whether the high-voltage fuse unit has blown due to overload or whether the resistance value has increased abnormally. In this embodiment, the resistance of the high-voltage fuse unit increases with the increase of voltage. Therefore, the resistance value can be detected by the fuse detection circuit, and when the resistance value is greater than a preset resistance value, it means that the voltage has exceeded the preset voltage.

[0058] The fuse detection circuit controls the on / off state of the input switch based on the resistance value, thereby avoiding potential damage to other parts of the system, and can restart the circuit after the high-voltage fuse unit is restored.

[0059] This embodiment provides a power line protection device that, by introducing an input switch and a fuse detection circuit, enables the entire system to react immediately upon detecting a fuse unit failure, greatly improving safety performance. The fuse detection circuit allows for self-diagnosis, automatically adjusting the input switch's operation based on the fuse unit's status. Immediate power cut-off upon detecting fuse unit failure effectively prevents secondary damage caused by short circuits or other issues, protecting the entire power line protection device and its connected low-voltage circuits, thus enhancing high-voltage protection capabilities.

[0060] In one embodiment, the input terminal is connected to the output terminal in sequence via an input terminal switch and a high-voltage fuse unit.

[0061] The input switch and the high-voltage fuse unit can be connected in series, that is, the input terminal is connected to the output terminal in sequence through the input switch and the high-voltage fuse unit. On this basis, the surge protection device can be connected to the connection point between the high-voltage fuse unit and the output terminal.

[0062] At this point, the high-voltage fuse unit is connected to both the output terminal and the surge protection circuit, achieving a dual protection mechanism. This means that the input switch is placed before the high-voltage fuse unit, providing an additional layer of safety in case the fuse unit fails or needs replacement. Even if the fuse unit fails to respond promptly, the input switch can act as a last line of defense to prevent the fault from escalating.

[0063] This embodiment provides a power line protection device that enhances the protection capability of the internal components of the power line protection device and the connected low-voltage circuits by connecting the input terminal switch and the high-voltage fuse unit in series. It also improves the overall safety and reliability of the system, thereby enhancing the high-voltage protection capability.

[0064] In one embodiment, such as Figure 2 As shown, the high voltage protection circuit also includes a first output terminal switch 24. The input terminal 1 is connected to the output terminal 4 in sequence through the input terminal switch 22, the high voltage fuse unit 21 and the first output terminal switch 24.

[0065] The fuse detection circuit 23 is also used to detect the resistance value of the high-voltage fuse unit 21 and control the first output terminal switch 24 to be turned on or off based on the resistance value.

[0066] In this embodiment, the high-voltage fuse unit 21 is also connected to the output terminal 4 through a first output terminal switch 24, which is used to control whether the current can flow from the high-voltage fuse unit 21 to the output terminal 4.

[0067] The fuse detection circuit 23 is also used to control the first output switch 24 to be turned on or off based on the resistance value. In conjunction with the fuse detection circuit 23, the first output switch 24 can respond more precisely based on the state of the high-voltage fuse unit 21, ensuring that current is only allowed to flow when the high-voltage fuse unit 21 is operating normally. If the high-voltage fuse unit 21 blows due to overload or its resistance value increases abnormally, the fuse detection circuit 23 will immediately trigger the first output switch 24 to open, preventing current from continuing to flow to the output terminal 4, thereby protecting the downstream circuit from damage.

[0068] This embodiment provides a power line protection device that forms a triple protection mechanism through the combination of an input terminal switch, a high-voltage fuse unit, and a first output terminal switch. This can improve the overall safety of the system, react quickly when the fuse unit fails, reduce the impact time on the entire power line protection device, and improve the stability and reliability of the system, thereby enhancing the high-voltage protection capability.

[0069] In one embodiment, the fuse detection circuit is connected to an external terminal, and the fuse detection circuit is also used to detect the resistance value of the high-voltage fuse unit and send the resistance value to the external terminal.

[0070] The first output switch and input switch are also used to turn on or off based on control from an external terminal.

[0071] In this embodiment, the fuse detection circuit controls the on and off of the first output switch and the input switch through an external terminal. The fuse detection circuit can be connected to the external terminal through a communication interface, such as serial communication protocol, CAN bus, Ethernet, wireless communication protocol, etc., and transmit the resistance value information of the high voltage fuse unit in real time.

[0072] The external terminal can make further judgments based on historical resistance value statistics, set corresponding resistance thresholds, and control the first output terminal switch and input terminal switch to turn on or off when the resistance value exceeds the resistance threshold. Furthermore, the external terminal can be an electronic product connected to the subsequent circuit, or it can be a management terminal for the electronic product.

[0073] This embodiment provides a power line protection device that achieves a higher level of intelligent management by introducing an external terminal, including but not limited to functions such as remote monitoring, data analysis, automatic alarm, and remote control. This makes the system more intelligent and efficient, enabling many maintenance tasks to be completed without being close to the equipment, reducing the need for on-site operations, improving work efficiency, and thus achieving the effect of improving high-voltage protection capabilities.

[0074] In one embodiment, the input is connected to the output via an input switch.

[0075] In this embodiment, the high-voltage fuse unit is connected in series with the surge protection circuit, and the input terminal is directly connected to the output terminal through an input terminal switch. Alternatively, the high-voltage fuse unit can be connected in parallel with the output terminal to the input terminal switch.

[0076] This embodiment provides a power line protection device that reduces the number of components the current must pass through by connecting the input terminal directly to the output terminal via an input terminal switch, thereby reducing potential contact resistance and energy loss, improving transmission efficiency, and ultimately enhancing high-voltage protection capabilities.

[0077] In one embodiment, such as Figure 3 As shown, the high voltage protection circuit also includes a second output switch 25, and the input terminal is connected to the output terminal 4 via the input switch 22 and the second output switch 25 in sequence.

[0078] The fuse detection circuit 23 is also used to detect the resistance value of the high-voltage fuse unit 21 and control the second output switch 25 to turn on or off based on the resistance value.

[0079] The second output switch 25 and the high-voltage fuse unit 21 are respectively connected to the input switch 22. The input switch 22 is connected to the output terminal through the second output switch 25 and to the surge protection circuit 3 through the high-voltage fuse unit 21.

[0080] Under normal operating conditions, both input switch 22 and second output switch 25 are closed, allowing current to flow smoothly from input 1 to output 4. Furthermore, the high-voltage fuse unit 21 serves as a circuit, and the surge protection circuit 3 can absorb or transfer transient energy impacts.

[0081] When the voltage increases and remains high, the resistance value of the high-voltage fuse unit 21 also increases. The fuse detection circuit 23 detects the abnormal increase in the resistance value of the high-voltage fuse unit 21. If the resistance value is greater than the preset resistance value, a signal is sent to control the input terminal switch 22 and the second output terminal switch 25 to disconnect. By setting two switches, redundant protection measures can be achieved. Even if one of the switches fails, it can still ensure that the subsequent circuits are not damaged by high voltage.

[0082] The power line protection device provided in this embodiment provides an additional protection layer by introducing a second output terminal switch, which reduces the risk caused by single-point failure. The dual-switch mechanism ensures that even if one switch fails, the other switch can effectively cut off the current path, thereby improving the overall system reliability and achieving the effect of improving high-voltage protection capability.

[0083] In one embodiment, the fuse detection circuit is connected to an external terminal, and the fuse detection circuit is also used to detect the resistance value of the high-voltage fuse unit and send the resistance value to the external terminal.

[0084] The second output switch and input switch are also used to turn on or off based on control from an external terminal.

[0085] In this embodiment, the fuse detection circuit controls the on / off state of the second output switch and the input switch through an external terminal. The fuse detection circuit can be connected to the external terminal through a communication interface, such as a serial communication protocol, CAN bus, Ethernet, wireless communication protocol, etc., and transmit the resistance value information of the high-voltage fuse unit in real time.

[0086] The external terminal can make further judgments based on historical resistance value statistics, set corresponding resistance thresholds, and control the second output terminal switch and the input terminal switch to turn on or off when the resistance value exceeds the resistance threshold. Furthermore, the external terminal can be an electronic product connected to the subsequent circuit, or it can be a management terminal for the electronic product.

[0087] This embodiment provides a power line protection device that achieves a higher level of intelligent management by introducing an external terminal, including but not limited to functions such as remote monitoring, data analysis, automatic alarm, and remote control. This makes the system more intelligent and efficient, enabling many maintenance tasks to be completed without being close to the equipment, reducing the need for on-site operations, improving work efficiency, and thus achieving the effect of improving high-voltage protection capabilities.

[0088] In one embodiment, the surge protection circuit includes a surge protection chip, and a high-voltage fuse unit is soldered to the surge protection chip.

[0089] Surge protection chips can be integrated circuits specifically designed to absorb or transfer transient overvoltages, such as lightning strikes and power surges. They can integrate multiple protective components, such as TVS diodes, metal oxide rheostats, and gas discharge tubes. Surge protection chips can be implemented using existing surge protection chips.

[0090] The high-voltage fuse unit and the surge protection chip are connected by welding, or more specifically by spot welding, which can improve the electrical and mechanical stability between components and enhance the overall reliability and durability of the system.

[0091] This embodiment provides a power line protection device that combines a surge protection chip with a high-voltage fuse unit to achieve a dual protection mechanism for the system. At the same time, the high-voltage fuse unit can also prevent damage to the surge protection chip itself under excessive voltage conditions, thereby improving the durability of electronic products and power line protection devices and achieving the effect of improving high-voltage protection capabilities.

[0092] To more clearly illustrate the technical solution of this application, a detailed embodiment is also provided.

[0093] In one embodiment, a power line protection device is provided for surge protection scenarios involving multiple interwoven cables and power line splices in the mixed cables. Power line splices are common in cable laying projects. Regarding the surge problems caused by power line splices, the following situations usually exist: (1) During the cable interweaving process, there may be a situation where a low-frequency 50Hz power frequency signal is coupled to the signal line, thereby affecting the high-speed signal; (2) After directly splicing 220V high voltage, the high voltage is continuously applied to the high-speed signal line. Although it causes temporary interference, it can be solved by applying a shielding layer outside the signal line or adding other filtering measures. However, the direct application of high voltage is permanent damage, which will directly damage the signal line, causing the line to burn out, short circuit and fire, and other destructive problems.

[0094] In this embodiment, by separating the surge protection for power line overlaps from ordinary surge protection into a single protective device, it can be directly applied in practical applications to solve the problem of surge impact caused by continuous power line overlaps, achieving miniaturized port and routine protection. Figure 4As shown, the power line protection device includes: an input terminal, a high-voltage protection circuit, a surge protection circuit, and an output terminal. The high-voltage protection circuit includes an input terminal switch, a high-voltage fuse unit, a fuse detection circuit, and a third output terminal switch. The power input is the input terminal; the pre-stage switch is the input terminal switch; the post-stage switch is the third output terminal switch; and the output terminal connects to the subsequent circuit (low-voltage interface). The high-voltage fuse unit is a PTC (positive temperature coefficient thermistor).

[0095] The input terminal is connected to the output terminal in sequence via an input terminal switch and a third output terminal switch, and is also connected to the surge protection circuit in sequence via an input terminal switch and a high-voltage fuse unit. The surge protection circuit is grounded.

[0096] Surge protection circuits are used to protect against transient overvoltages and / or transient overcurrents in the input voltage at the input terminal.

[0097] The high-voltage protection circuit is used to connect or disconnect the input terminal from the output terminal and the surge protection circuit in response to the high / low voltage value and duration of the input voltage. The input terminal switch controls the connection or disconnection between the input terminal and the high-voltage fuse unit and the third output terminal switch. The high-voltage fuse unit can be a positive temperature coefficient thermistor, which adjusts its resistance value to regulate the current flowing through it in response to the input voltage. The fuse detection circuit detects the resistance value of the high-voltage fuse unit and controls the connection or disconnection of the input terminal switch based on this resistance value. The third output terminal switch controls the connection or disconnection between the input terminal switch and the output terminal.

[0098] The fuse detection circuit is connected to an external terminal. The fuse detection circuit is also used to detect the resistance value of the high-voltage fuse unit and send the resistance value to the external terminal. The third output switch and the input switch are also used to turn on or off based on the control of the external terminal.

[0099] In this embodiment, a temporary high-voltage continuous surge circuit is constructed to address the impact of a high-voltage continuous surge. A fuse detection circuit is used to detect any abnormal phenomena in this surge protection circuit where a high-voltage continuous surge is applied, and feeds back to the management terminal for early warning. Ordinary surge paths are protected by ordinary surge protection. A recoverable short-circuit protection PTC is connected in series with the ordinary surge protection for distribution. During normal surge injection, this part of the circuit operates, and the PTC provides the path for ordinary surge protection. After applying voltage after a power line connection, the PTC will fuse due to the continuous high voltage of the power line, causing an open circuit in the ordinary surge protection path. At this time, the power line protection path provides protection against the power line surge. Then, the fuse detection circuit transmits the abnormal problem to the management terminal, which then disconnects the third output switch and the input switch.

[0100] The surge protection described above can be adapted to the specific circuit. The fuse detection circuit needs to perform real-time monitoring, with a detection frequency at the microsecond level. By monitoring the PTC in real time, under abnormal voltage input conditions, the fuse detection circuit will control the switches before and after the power supply to ensure that the power input section does not experience a short circuit and that the entire downstream device, including chips and circuits, does not burn out, thus minimizing losses.

[0101] Furthermore, the power line protection device in this embodiment can be integrated into a three-terminal device, comprising four parts: a circuit switch, a PTC, a fuse detection circuit, and a surge protection circuit. The two ends of the front and rear stages are used for input / output circuits, while the other end is used to connect to the device's system ground or chassis ground. The PTC pins are connected to the surge protection chip wafer using a splicing method and micro-soldering for spot welding. This reduces the package size of the original PTC and protection device, thus reducing the overall size of the protection device and resulting in a new type of integrated power line protection surge protection device.

[0102] like Figure 5 The image shown is a surge waveform diagram for surge protection in traditional technologies, such as... Figure 6 The figure shown is a surge waveform diagram under power line conditions in this embodiment. The experimental results show that the power supply to the equipment is directly cut off after the power line is connected, thus providing a better protection scheme for downstream power equipment.

[0103] like Figure 7 The diagram shown is a device architecture diagram of a power line protection device in one embodiment. In the diagram, A, B and C are the pins of the device, A is the input terminal, B is the ground terminal, C is the output terminal, a and b are the input terminal switch and the third output terminal switch, respectively, c and d are the fuse detection circuit, and e is the protection integration part, which includes a high-voltage fuse unit and a surge protection chip, together forming a power line protection device.

[0104] This embodiment provides a power line protection device that, through a design that separates power lines from ordinary surge protection, achieves surge protection against power line overlaps in a mixed cable configuration. It provides surge protection for other low-voltage lines under a 50Hz power frequency voltage, with protection voltage levels ranging from at least 0.5 to 10kV and protection current levels reaching 5KA. It can be used for low-voltage protection ports, providing protection against continuous high-voltage surges, reducing equipment damage caused by power line overlaps, significantly lowering the probability of equipment damage due to surges, and reducing the risk of equipment burnout. It can be applied to various ports, including signal ports and low-voltage power ports, primarily in applications with complex cable interweaving and power line overlaps, extending the lifespan of electronic products in specific areas, reducing spontaneous combustion caused by power line overlaps, and improving product quality. It can be applied to both ordinary surge protection and surge protection for power line overlaps.

[0105] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0106] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A power line protection device, characterized by, The power line protection device comprises an input end, a high-voltage protection circuit, a surge protection circuit and an output end, the input end is connected with the output end and the surge protection circuit through the high-voltage protection circuit, and the surge protection circuit is grounded. The surge protection circuit is used for surge protection of transient overvoltage and / or transient overcurrent in the input voltage of the input end. The high-voltage protection circuit is used for turning on or off the connection between the input end and the output end and the surge protection circuit in response to the voltage value and the duration state of the input voltage.

2. The power line guard of claim 1, wherein, The high-voltage protection circuit comprises a high-voltage fuse unit, The input end is connected with the surge protection circuit through the high-voltage fuse unit. The high-voltage fuse unit is used for adjusting the current value flowing through itself by adjusting the resistance value of itself in response to the input voltage of the input end.

3. The power line guard of claim 2, wherein, The high-voltage protection circuit further comprises an input end switch and a fuse detection circuit, and the input end is connected with the high-voltage fuse unit through the input end switch. The input end switch is used for controlling the turn-on of the input end and the high-voltage fuse unit. The fuse detection circuit is used for detecting the resistance value of the high-voltage fuse unit and controlling the turn-on or turn-off of the input end switch based on the resistance value.

4. The power line guard of claim 3, wherein, The input end is connected with the output end through the input end switch and the high-voltage fuse unit in sequence.

5. The power line guard of claim 4, wherein, The high-voltage protection circuit further comprises a first output end switch, and the input end is connected with the output end through the input end switch, the high-voltage fuse unit and the first output end switch in sequence. The fuse detection circuit is further used for detecting the resistance value of the high-voltage fuse unit and controlling the turn-on or turn-off of the first output end switch based on the resistance value.

6. The power line guard of claim 5, wherein, The fuse detection circuit is connected with an external terminal, and the fuse detection circuit is further used for detecting the resistance value of the high-voltage fuse unit and sending the resistance value to the external terminal. The first output end switch and the input end switch are further used for turning on or off based on the control of the external terminal.

7. The power line guard of claim 3, wherein, The input end is connected with the output end through the input end switch.

8. The power line guard of claim 7, wherein, The high-voltage protection circuit further comprises a second output end switch, and the input end is connected with the output end through the input end switch and the second output end switch in sequence. The fuse detection circuit is further used for detecting the resistance value of the high-voltage fuse unit and controlling the turn-on or turn-off of the second output end switch based on the resistance value.

9. The power line guard of claim 8, wherein, The fuse detection circuit is connected with an external terminal, and the fuse detection circuit is further used for detecting the resistance value of the high-voltage fuse unit and sending the resistance value to the external terminal. The second output end switch and the input end switch are further used for turning on or off based on the control of the external terminal.

10. The power line guard of claim 2, wherein, The surge protection circuit comprises a surge protection chip, and the high-voltage fuse unit is welded with the surge protection chip.

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