A multi-channel protection circuit, a cable connector and a marine device

Abstract

The utility model provides a kind of multi-channel protection circuit, cable connector and marine equipment, the multi-channel protection circuit includes: sampling unit, first protection channel unit, second protection channel unit and output unit, the output end of sampling unit is connected with the input end of first protection channel unit and the input end of second protection channel unit respectively;The output end of first protection channel unit is connected with the first input end of output unit, and the output end of second protection channel unit is connected with the second input end of output unit;Sampling unit is used to export corresponding voltage signal according to sampling signal output;First protection channel unit is used to export first protection signal according to voltage signal and first protection threshold value;Second protection channel unit is used to export second protection signal according to voltage signal and second protection threshold value;Output unit is used to export control signal according to the first protection signal or second protection signal.The application improves the reliability of protection circuit.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, specifically to a multi-channel protection circuit, a cable connector, and marine equipment. Background Technology

[0002] In power electronics and industrial control systems, protection circuits are widely used to prevent equipment damage caused by abnormal operating conditions such as overvoltage, overcurrent, or short circuit.

[0003] In applications requiring high reliability, such as marine observation and underwater operations, cable connectors, as critical nodes for energy and signal transmission, directly impact the safe operation of the entire system due to their fault isolation capabilities. Sudden faults such as cable breakage or insulation failure can easily trigger a chain reaction if the faulty circuit cannot be quickly disconnected, leading to damage to the main control unit or paralysis of the sensor network. Existing technologies employ hardware protection circuits that directly compare the sampled signal with a fixed threshold using a comparator to determine if a fault has occurred, offering the advantage of fast response. However, the protection threshold of these hardware protection circuits is typically set by a resistor divider network, requiring pre-determined settings and lacking dynamic adjustment flexibility, making them unsuitable for complex marine environments. Utility Model Content

[0004] To address the problems in the prior art, this utility model provides a multi-channel protection circuit, a cable connector, and marine equipment.

[0005] In a first aspect, this utility model proposes a multi-channel protection circuit, including a sampling unit, a first protection channel unit, a second protection channel unit, and an output unit, wherein: The output terminal of the sampling unit is connected to the input terminal of the first protection channel unit and the input terminal of the second protection channel unit, respectively; the output terminal of the first protection channel unit is connected to the first input terminal of the output unit, and the output terminal of the second protection channel unit is connected to the second input terminal of the output unit. The sampling unit is used to output a corresponding voltage signal based on the sampling signal; the first protection channel unit is used to output a first protection signal based on the voltage signal and a first protection threshold; the second protection channel unit is used to output a second protection signal based on the voltage signal and a second protection threshold; the output unit is used to output a control signal based on the first protection signal or the second protection signal; wherein the first protection threshold is greater than the second protection threshold.

[0006] Furthermore, the first protection channel unit includes a first follower and a comparator, wherein: The input terminal of the first follower is connected to the output terminal of the sampling unit, the output terminal of the first follower is connected to the first input terminal of the comparator, the second input terminal of the comparator is used to input the first protection threshold, and the output terminal of the comparator is connected to the first input terminal of the output unit.

[0007] Furthermore, the second protection channel unit includes a second follower and a microcontroller, wherein: The input terminal of the second follower is connected to the output terminal of the sampling unit, and the output terminal of the second follower is connected to the sampling terminal of the microcontroller; the output terminal of the microcontroller is connected to the second input terminal of the output unit.

[0008] Furthermore, the first protection threshold and the second protection threshold are configured in the microcontroller, which is connected to the first protection channel unit and provides the first protection threshold to the first protection channel unit.

[0009] Furthermore, the microcontroller is a single-chip microcomputer based on the Cortex-M4 core.

[0010] Furthermore, the output unit employs an OR gate.

[0011] Furthermore, the sampling unit includes a first resistor, a second resistor, and a capacitor. The first end of the first resistor receives the sampling signal. The second end of the first resistor is connected to the input end of the first protection channel unit, the input end of the second protection channel unit, and the first end of the second resistor, respectively. The second end of the second resistor is grounded. The capacitor is connected in parallel with the second resistor.

[0012] Furthermore, the sampling unit includes an operational amplifier, a third resistor, a fourth resistor, and a fifth resistor, wherein: The inverting input of the operational amplifier receives the sampling signal. The non-inverting input of the operational amplifier is connected to the first terminal of the third resistor, and the second terminal of the third resistor is grounded. The first terminal of the fourth resistor is connected to the inverting input of the operational amplifier, and the second terminal of the fourth resistor is connected to the output terminal of the operational amplifier. The first terminal of the fifth resistor is connected to the output terminal of the operational amplifier, and the second terminal of the fifth resistor is grounded. The output terminal of the operational amplifier is connected to the input terminal of the first protection channel unit and the input terminal of the second protection channel unit, respectively.

[0013] Secondly, this utility model proposes a cable connector, including the multi-channel protection circuit described in any of the above embodiments, wherein the input terminal of the multi-channel protection circuit is connected to the cable, and the output terminal of the multi-channel protection circuit is connected to the power control circuit.

[0014] Thirdly, this utility model proposes a marine device including the cable connector described in the above embodiments.

[0015] The multi-channel protection circuit, cable connector, and marine equipment provided in this embodiment include a sampling unit, a first protection channel unit, a second protection channel unit, and an output unit. The output terminal of the sampling unit is connected to the input terminals of the first protection channel unit and the second protection channel unit, respectively. The output terminal of the first protection channel unit is connected to the first input terminal of the output unit, and the output terminal of the second protection channel unit is connected to the second input terminal of the output unit. The sampling unit is used to output a corresponding voltage signal based on the sampling signal. The first protection channel unit is used to output a first protection signal based on the voltage signal and a first protection threshold. The second protection channel unit is used to output a second protection signal based on the voltage signal and a second protection threshold. The output unit is used to output a control signal based on the first protection signal and the second protection signal. The first protection threshold is greater than the second protection threshold. Through a dual-channel collaborative protection mechanism, it is applicable to complex marine environments and improves the reliability of the protection circuit. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a multi-channel protection circuit provided in an embodiment of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the first protection channel unit provided in an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of the second protection channel unit provided in an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the sampling circuit provided in one embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the sampling circuit provided in another embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the structure of a multi-channel protection circuit provided in another embodiment of this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of this utility model and their descriptions are used to explain this utility model, but are not intended to limit this utility model. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0024] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of 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 units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.

[0025] To facilitate understanding of the technical solution provided in this application, the relevant content of the technical solution in this application will be explained below.

[0026] In marine observation systems, the main control chamber of marine equipment is connected to external devices such as sensors via cables. Due to the complexity of underwater conditions, cables are a vulnerable point. If a cable breaks, the exposed portion will directly contact seawater, potentially causing short circuits, overcurrent, and other abnormal conditions. Therefore, in the event of a short circuit, the main control chamber must promptly disconnect the faulty line to achieve electrical isolation of the faulty port, preventing the fault from spreading and affecting other units of the marine equipment, and ensuring that the main body of the marine equipment continues to operate normally and stably.

[0027] Existing circuit protection solutions are mainly divided into three categories: one is pure hardware protection circuits, which have the advantage of fast response speed, but the parameters cannot be configured after leaving the factory and the protection threshold cannot be adjusted; another is high-speed programmable protection circuits based on devices such as FPGAs, which have the advantages of fast response speed and programmable configuration after leaving the factory, but the overall cost is relatively high; and the third is programmable protection circuits based on microcontrollers, which have the advantages of low cost and flexible programming, but the protection response is slower than that of pure hardware protection circuits.

[0028] For cables used in marine equipment, there are transient, self-healing disturbances (such as contact with marine life or short-term overvoltage), and the cables have a relatively large thermal time constant, meaning short-term overloads will not cause damage. While pure hardware protection circuits offer fast response times, their fixed protection thresholds cannot prevent false tripping due to transient interference. Programmable protection circuits based on microcontrollers offer adjustable protection thresholds and can mitigate false tripping caused by transient interference through delayed power shutdown, but their slow response time poses a risk of failing to promptly disconnect faulty lines, potentially damaging the marine equipment. High-speed programmable protection circuits based on FPGAs are prohibitively expensive.

[0029] Therefore, this utility model embodiment provides a multi-channel protection circuit that avoids the high cost of using FPGA. Through hierarchical protection, it can not only avoid false tripping caused by instantaneous interference, but also cut off the faulty line in time when the cable actually fails, making it suitable for complex marine environments.

[0030] Figure 1 This is a schematic diagram of the structure of a multi-channel protection circuit provided in an embodiment of this utility model, as shown below. Figure 1 As shown, the multi-channel protection circuit provided in this embodiment of the present invention includes a sampling unit 1, a first protection channel unit 2, a second protection channel unit 3, and an output unit 4, wherein: The output terminal of sampling unit 1 is connected to the input terminal of the first protection channel unit 2 and the input terminal of the second protection channel unit 3, respectively; the output terminal of the first protection channel unit 2 is connected to the first input terminal of output unit 4, and the output terminal of the second protection channel unit 3 is connected to the second input terminal of output unit 4. Sampling unit 1 is used to output a corresponding voltage signal based on the sampled signal; first protection channel unit 2 is used to output a first protection signal based on the voltage signal and a first protection threshold; second protection channel unit 3 is used to output a second protection signal based on the voltage signal and a second protection threshold; output unit 4 is used to output a control signal based on the first protection signal and the second protection signal; wherein, the first protection threshold is greater than the second protection threshold.

[0031] Specifically, sampling unit 1 can be connected to a cable to obtain a sampling signal from the cable, then convert the sampling signal into a corresponding voltage signal, and then output the voltage signal corresponding to the sampling signal to the first protection channel unit 2 and the second protection channel unit 3.

[0032] The first protection channel unit 2 outputs a first protection signal based on the voltage signal and a first protection threshold, indicating a cable fault. The second protection channel unit 3 outputs a second protection signal based on the voltage signal and a second protection threshold, indicating a prolonged minor overload on the cable. The output unit 4 outputs a control signal based on either the first or second protection signal, triggering cable fault protection. The first protection threshold is greater than the second protection threshold, and the thresholds for triggering protection actions by the first protection channel unit 2 and the second protection channel unit 3 are different, achieving dual-channel collaborative protection.

[0033] The multi-channel protection circuit provided in this embodiment includes a sampling unit, a first protection channel unit, a second protection channel unit, and an output unit. The output terminal of the sampling unit is connected to the input terminals of the first protection channel unit and the second protection channel unit, respectively. The output terminal of the first protection channel unit is connected to the first input terminal of the output unit, and the output terminal of the second protection channel unit is connected to the second input terminal of the output unit. The sampling unit is used to output a corresponding voltage signal based on the sampled signal. The first protection channel unit is used to output a first protection signal based on the voltage signal and a first protection threshold. The second protection channel unit is used to output a second protection signal based on the voltage signal and a second protection threshold. The output unit is used to output a control signal based on the first protection signal and the second protection signal. The first protection threshold is greater than the second protection threshold. Through the dual-channel collaborative protection mechanism, it is applicable to complex marine environments and improves the reliability of the protection circuit.

[0034] Figure 2 This is a structural schematic diagram of the first protection channel unit provided in an embodiment of the present invention, as shown below. Figure 2 As shown, based on the above embodiments, the first protection channel unit 2 further includes a first follower A1 and a comparator U, wherein: The input terminal of the first follower A1 is connected to the output terminal of the sampling unit 1. The output terminal of the first follower A1 is connected to the first input terminal of the comparator U. The second input terminal of the comparator U is used to input the first protection threshold. The output terminal of the comparator U is connected to the first input terminal of the output unit.

[0035] Specifically, the first follower A1 can improve the reliability of the voltage signal and achieve voltage isolation between the preceding and following circuits. Comparator U compares the voltage signal with a first protection threshold. If the voltage signal is greater than the first protection threshold, the first protection signal output by comparator U is a high-level signal, used to shut off the power to the cable connection. If the voltage signal is less than or equal to the first protection threshold, the first protection signal output by comparator U is a low-level signal, and the power to the cable connection operates normally. The first follower A1 can be a voltage follower. The first protection threshold is set according to actual needs, and this embodiment of the invention does not impose limitations.

[0036] The first protection channel unit 2 includes a first follower A1 and a comparator U, which constitute a hardware protection circuit. It can quickly respond to cable faults and provide a high-level first protection signal in a timely manner after a cable fault, so as to avoid damage to marine equipment connected to the cable.

[0037] Figure 3 This is a schematic diagram of the structure of the second protection channel unit provided in an embodiment of the present invention, as shown below. Figure 3 As shown, based on the above embodiments, the second protection channel unit 3 further includes a second follower A2 and a microcontroller unit (MCU) M, wherein: The input terminal of the second follower A2 is connected to the output terminal of the sampling unit 1, and the output terminal of the second follower A1 is connected to the sampling terminal of the microcontroller M; the output terminal of the microcontroller M is connected to the second input terminal of the output unit 4.

[0038] Specifically, the second follower A2 can improve the reliability of the voltage signal and achieve voltage isolation between the preceding and following circuits. The sampling terminal of the microcontroller M performs analog-to-digital sampling on the voltage signal received from the output terminal of the second follower A2 to obtain the sampled voltage value. If the sampled voltage value is greater than the second protection threshold and the duration is longer than a preset duration, the second protection signal output by the microcontroller M is a high-level signal, used to shut off the power supply of the cable connection. If the sampled voltage value is less than or equal to the second protection threshold, the second protection signal output by the microcontroller M is a low-level signal, and the power supply of the cable connection operates normally. The sampling terminal of the microcontroller M can use an analog input interface, connected to the analog-to-digital converter inside the microcontroller M, to convert the input analog signal into a digital signal. The output terminal of the microcontroller M can use a general purpose input / output (GPIO) port. The second protection threshold and the preset duration are set according to actual needs, and this embodiment of the invention does not limit them. The second follower A2 can be a voltage follower.

[0039] The second protection channel unit 3 is a protection circuit with a microcontroller as its core. It can flexibly set the second protection threshold and preset duration to reduce false protection actions.

[0040] Based on the above embodiments, the first protection threshold and the second protection threshold are further configured in the microcontroller M. The microcontroller M is connected to the first protection channel unit 2 and provides the first protection threshold to the first protection channel unit 2.

[0041] For example, the microcontroller M outputs the first protection threshold to the first protection channel unit 2 through an analog output interface.

[0042] By providing a first protection threshold through the microcontroller M, the first protection threshold used by the multi-channel protection circuit for hardware protection can be adjusted according to actual needs after leaving the factory, thereby improving the applicability of the multi-channel protection circuit.

[0043] Building upon the above embodiments, the microcontroller further employs a Cortex-M4 core-based microcontroller. For example, the microcontroller uses the GD32F470 model.

[0044] Based on the above embodiments, the output unit 4 further adopts an OR gate.

[0045] An OR gate can output a high-level signal when either the first or second protection signal is high, triggering the protection action. When both the first and second protection signals are low, the OR gate will output a low-level signal and will not trigger the protection action.

[0046] Figure 4 This is a schematic diagram of the sampling circuit provided in one embodiment of the present invention, as shown below. Figure 4 As shown, based on the above embodiments, the sampling unit further includes a first resistor R1, a second resistor R2, and a capacitor C. The first end of the first resistor R1 receives the sampling signal. The second end of the second resistor R2 is connected to the input end of the first protection channel unit 2, the input end of the second protection channel unit 3, and the first end of the second resistor R2, respectively. The second end of the second resistor R2 is grounded. The capacitor C is connected in parallel with the second resistor R2.

[0047] In this design, the first resistor R1 and the second resistor R2 are connected in series to divide the voltage, ensuring that the output voltage of the sampled signal matches the voltage requirements of the subsequent first protection channel unit 2 and second protection channel unit 3. The capacitor C and the second resistor R2 are connected in parallel to form an RC low-pass filter, which filters out high-frequency noise and improves the stability of the sampled signal.

[0048] Figure 5 This is a schematic diagram of the sampling circuit provided in another embodiment of the present invention, as shown below. Figure 5 As shown, based on the above embodiments, the sampling unit 1 further includes an operational amplifier B, a third resistor R3, a fourth resistor R4, and a fifth resistor R5, wherein: The inverting input of operational amplifier B receives the sampling signal. The non-inverting input of operational amplifier B is connected to the first terminal of the third resistor R3, and the second terminal of the third resistor R3 is grounded. The first terminal of the fourth resistor R4 is connected to the inverting input of operational amplifier B, and the second terminal of the fourth resistor R4 is connected to the output terminal of operational amplifier B. The first terminal of the fifth resistor R5 is connected to the output terminal of operational amplifier B, and the second terminal of the fifth resistor R5 is grounded. The output terminal of operational amplifier B is connected to the input terminal of the first protection channel unit 2 and the input terminal of the second protection channel unit 3, respectively.

[0049] The sampled signal is a current signal, which is converted into a voltage signal by operational amplifier B. The fourth resistor R4 determines the current-to-voltage conversion ratio. R3 is used to counteract the influence of the op-amp input bias current. The fifth resistor R5 serves as the output load.

[0050] Figure 6 This is a schematic diagram of the structure of a multi-channel protection circuit provided in another embodiment of this utility model, as shown below. Figure 6 As shown, the multi-channel protection circuit provided in this embodiment of the present invention includes a sampling unit 1, a first protection channel unit 2, a second protection channel unit 3, and an output unit 4, wherein: The first protection channel unit 2 includes a first follower A1 and a comparator U; the second protection channel unit 3 includes a second follower A2 and a microcontroller M; the output unit 4 uses an OR gate; the sampling unit 1 can use... Figure 4 or Figure 5 The circuit structure shown can be selected according to actual needs.

[0051] Sampling unit 1 can be connected to a cable to obtain a sampling signal from the cable, then convert the sampling signal into a corresponding voltage signal, and then output the voltage signal corresponding to the sampling signal to the first protection channel unit 2 and the second protection channel unit 3. The input terminal of the first follower A1 is connected to the output terminal of the sampling unit 1. The output terminal of the first follower A1 is connected to the first input terminal of the comparator U. The second input terminal of the comparator U is connected to the analog output terminal of the microcontroller M, and receives the first protection threshold output by the analog output terminal of the microcontroller M. The output terminal of the comparator U is connected to the first output terminal of the output unit 4. The comparator U compares the first protection threshold with the sampled voltage signal and outputs the first protection signal to the output unit 4.

[0052] The input terminal of the second follower A2 is connected to the output terminal of the sampling unit 1, and the output terminal of the second follower A1 is connected to the sampling terminal of the microcontroller M; the output terminal of the microcontroller M is connected to the second input terminal of the output unit 4. The microcontroller M outputs a second protection signal to the output unit 4 based on the sampled voltage signal.

[0053] Output unit 4 outputs control signals based on the first protection signal and the second protection signal.

[0054] This utility model provides a cable connector, including the multi-channel protection circuit described in any of the above embodiments. The input terminal of the multi-channel protection circuit is connected to the cable, and the output terminal of the multi-channel protection circuit is connected to the power control circuit.

[0055] The power control circuit is used to disconnect or maintain the electrical connection between the cable and the power supply based on the control signal output from the output terminal of the multi-channel protection circuit. When the control signal received by the power control circuit is a high-level signal, it will control the power supply to be turned off; when the control signal received by the power control circuit is a low-level signal, it will not turn off the power supply.

[0056] This utility model provides a marine device including the cable connector described in the above embodiment.

[0057] Specifically, marine equipment can be connected to cables via cable connectors, and the cables can then power external devices such as sensors. Marine equipment includes, but is not limited to, marine buoys, seabed bases, and underwater equipment for earthquake testing systems.

[0058] The marine equipment provided in this embodiment of the invention employs a cable connector including the aforementioned multi-channel protection circuit. Through the dual-channel collaborative protection mechanism, it reduces false protection actions while maintaining a high protection response rate, achieving excellent protection performance while controlling the cost of the protection circuit. The main control chamber of the marine equipment can promptly disconnect faulty lines, achieving electrical isolation of faulty cables, effectively preventing the spread of faults to other units, and ensuring the continuous and stable operation of the marine equipment.

[0059] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0060] In the description of this specification, the references to terms such as "an embodiment," "a specific embodiment," "some embodiments," "for example," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A multi-channel protection circuit, characterized by, It includes a sampling unit, a first protection channel unit, a second protection channel unit, and an output unit, wherein: The output terminal of the sampling unit is connected to the input terminal of the first protection channel unit and the input terminal of the second protection channel unit, respectively; the output terminal of the first protection channel unit is connected to the first input terminal of the output unit, and the output terminal of the second protection channel unit is connected to the second input terminal of the output unit. The sampling unit is used to output a corresponding voltage signal based on the sampling signal; the first protection channel unit is used to output a first protection signal based on the voltage signal and a first protection threshold; the second protection channel unit is used to output a second protection signal based on the voltage signal and a second protection threshold; the output unit is used to output a control signal based on the first protection signal or the second protection signal; wherein the first protection threshold is greater than the second protection threshold.

2. The multi-channel protection circuit according to claim 1, characterized in that, The first protection channel unit includes a first follower and a comparator, wherein: The input terminal of the first follower is connected to the output terminal of the sampling unit, the output terminal of the first follower is connected to the first input terminal of the comparator, the second input terminal of the comparator is used to input the first protection threshold, and the output terminal of the comparator is connected to the first input terminal of the output unit.

3. The multi-channel protection circuit according to claim 1, characterized in that, The second protection channel unit includes a second follower and a microcontroller, wherein: The input terminal of the second follower is connected to the output terminal of the sampling unit, and the output terminal of the second follower is connected to the sampling terminal of the microcontroller; the output terminal of the microcontroller is connected to the second input terminal of the output unit.

4. The multi-channel protection circuit according to claim 3, characterized in that, The first protection threshold and the second protection threshold are configured in the microcontroller, which is connected to the first protection channel unit and provides the first protection threshold to the first protection channel unit.

5. The multi-channel protection circuit according to claim 3, characterized in that, The microcontroller is a single-chip microcomputer based on the Cortex-M4 core.

6. The multi-channel protection circuit according to claim 1, characterized in that, The output unit uses an OR gate.

7. The multi-channel protection circuit according to claim 1, characterized in that, The sampling unit includes a first resistor, a second resistor, and a capacitor. The first end of the first resistor receives the sampling signal. The second end of the first resistor is connected to the input end of the first protection channel unit, the input end of the second protection channel unit, and the first end of the second resistor, respectively. The second end of the second resistor is grounded. The capacitor is connected in parallel with the second resistor.

8. The multi-channel protection circuit according to claim 1, characterized in that, The sampling unit includes an operational amplifier, a third resistor, a fourth resistor, and a fifth resistor, wherein: The inverting input of the operational amplifier receives the sampling signal. The non-inverting input of the operational amplifier is connected to the first terminal of the third resistor, and the second terminal of the third resistor is grounded. The first terminal of the fourth resistor is connected to the inverting input of the operational amplifier, and the second terminal of the fourth resistor is connected to the output terminal of the operational amplifier. The first terminal of the fifth resistor is connected to the output terminal of the operational amplifier, and the second terminal of the fifth resistor is grounded. The output terminal of the operational amplifier is connected to the input terminal of the first protection channel unit and the input terminal of the second protection channel unit, respectively.

9. A cable connector, characterized in that, The circuit includes the multi-channel protection circuit according to any one of claims 1 to 8, wherein the input terminal of the multi-channel protection circuit is connected to a cable, and the output terminal of the multi-channel protection circuit is connected to a power control circuit.

10. A marine device, characterized in that, Includes the cable connector as described in claim 9.

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