Deep sea underwater node power supply isolation protection and water leakage alarm circuit

Abstract

The invention belongs to the technical field of underwater sound equipment design and manufacturing, and particularly relates to a deep sea underwater node power supply isolation protection and water leakage alarm circuit. Comprising a protection circuit, two wires led out from one end of the protection circuit are respectively connected with an input cathode, namely a wire on a deep submarine cable cabin-penetrating piece, and the other end of the protection circuit is connected with a cathode of a power supply module; the humidity monitoring circuit is connected with a photoelectric conversion module through RS485 communication, the photoelectric conversion module is connected with an upper computer through a deep submarine cable optical fiber, and the power supply end of the humidity monitoring circuit and the power supply end of the photoelectric conversion module are both connected to the output end of the power supply module; a water leakage detection circuit; according to the invention, the humidity change in the electronic cabin in the deep sea environment can be effectively monitored, and the operation of the whole system is protected to the greatest extent. Through real-time monitoring and protection means, adverse effects caused by water seepage and humidity changes can be effectively prevented, and the efficiency and reliability of deep sea operation are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of design and manufacture of hydroacoustic equipment, and in particular relates to a power supply isolation protection and water leakage alarm circuit for a deep sea underwater node. Background Art

[0002] JHydroacoustic equipment is an important part of the development of deep-sea business, and plays a very important role in deepening marine engineering construction, promoting the development and utilization of deep-sea resources, etc. The acquisition and analysis of signals in hydroacoustic equipment is an important part and the key to achieving seabed detection. However, in the complex environment of the deep sea, the operating environment of the electronic cabin of the hydroacoustic acquisition equipment is complex, and it is easy to have condensation or micro-seepage leading to excessive humidity, causing the integrated circuit to be damp, the power supply circuit to short-circuit, and reduce the stability of signal and power transmission, and ultimately affect the operation of the entire system.

[0003] Although the current technology research on the water tightness of the electronic cabin is quite mature, water leakage still occurs, and the appearance of condensed water and micro-seepage will also lead to increased humidity. It is dangerous and complicated to operate in the sea area with a depth of 2,000 meters. If water seepage or leakage occurs, the staff cannot understand the changes in the cabin status in time, nor can they easily open the cabin for inspection. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art. The present invention provides a deep-sea underwater node power supply isolation protection and water leakage alarm circuit. 1. Design a protection circuit, and adopt sealing and glue filling measures for the equipment that needs power supply and the exposed points of the live parts in the cabin to achieve the effect of power supply isolation protection; 2. Reserve space in the cabin to add temperature and humidity data acquisition modules, transmission modules and electrode sheets. Water ingress in the cabin triggers the alarm system to understand the cabin status in real time.

[0005] In order to solve the above technical problems, the present invention provides a deep sea underwater node power supply isolation protection and water leakage alarm circuit, comprising:

[0006] A protection circuit, wherein two wires led out from one end of the protection circuit are respectively connected to the input negative electrode, i.e., the wire on the deep-sea cable through-cabin component, and the other end is connected to the negative electrode of the power module;

[0007] A humidity monitoring circuit, wherein the humidity monitoring circuit is connected to a photoelectric conversion module via RS485 communication, the photoelectric conversion module is connected to a host computer via a deep-sea cable optical fiber, and the power supply ends of the humidity monitoring circuit and the photoelectric conversion module are both connected to the output end of the power supply module;

[0008] The water leakage detection circuit comprises: a J302 connector, two I / O ports, a resistor R318, a resistor R319, a resistor R324 and a MOS tube AO3402; the J302 connector is connected to an electrode sheet, a terminal 1 of the J302 connector is connected to one end of the resistor R324 and a gate end of the MOS tube AO3402, a drain end of the MOS tube AO3402 is connected to the other end of the resistor R324 and is grounded GND, a source end of the MOS tube AO3402 is connected to one end of the resistor R319 and a node Leak2, the other end of the resistor R319 is connected to one of the I / O ports, a terminal 2 of the J302 connector is connected to one end of the resistor R318, the other end of the resistor R318 is connected to another I / O port, a 3.3V voltage is provided to the two I / O ports through a host computer, and an output voltage is read from the node Leak2 through a collection system.

[0009] Preferably, the protection circuit uses a glass tube fuse. When the current increases due to water ingress into the underwater node electronic compartment, the fuse of the protection circuit can be blown out in time, thereby realizing power supply isolation protection of the underwater node electronic compartment.

[0010] Preferably, the humidity monitoring circuit adopts a high-precision humidity sensor, specifically a DC6V-36V temperature and humidity transmitter supporting RS485 communication and standard Modbus RTU protocol.

[0011] Preferably, the electronic compartment of the underwater node also includes a desiccant for maintaining the humidity in the compartment at a low value.

[0012] Preferably, the electrode sheet is installed at the lowest position in the electronic cabin of the underwater node, and the electrode sheet includes: a circuit substrate, a plurality of pads 1 and a plurality of pads 2; a plurality of pads 1 and a plurality of pads 2 are linearly and evenly arranged on the circuit substrate in an alternating manner, and the plurality of pads 1 and the plurality of pads 2 are respectively connected to the two wires of the J302 connector, and the two wires of the J302 connector are not interconnected, and the pads 1 and the pads 2 are not interconnected.

[0013] Preferably, the power module is a DC power module, whose input voltage is 375V and output voltage is 24V.

[0014] Preferably, it also includes a 110V switching power supply, a 110V to 375V slow-start circuit, three resistors and three air switches; the host computer is connected to the 110V switching power supply, the output positive and negative poles of the 110V switching power supply are connected to the input positive and negative poles of the 110V to 375V slow-start circuit, the output positive pole of the 110V to 375V slow-start circuit is connected to the input positive pole of three parallel DC power modules, the output negative pole of the 110V to 375V slow-start circuit is connected to the input negative pole of the three parallel DC power modules, and the output negative pole of the 110V to 375V slow-start circuit and the input negative pole of the three parallel DC power modules also include resistors and fuses connected in series in sequence, an air switch is connected between the input positive and negative poles of each DC power module, and the output ends of the three parallel DC power modules are respectively connected to three loads.

[0015] Preferably, the resistance values ​​of the resistors connected in series to the three DC power modules are 11Ω, 16Ω and 21Ω respectively.

[0016] Preferably, the specification of the fuse is a 1A fuse.

[0017] Preferably, the circuit board modules in the electronic compartment of the underwater node are integrally potted with thermal conductive adhesive, and the thermal conductive adhesive is a mixture of two types of adhesives, coolTherm SC-320LVH and coolTherm SC-320LVH HARDEN.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The humidity monitoring system of the present invention has a light structure, is easy to install, has a wide power supply voltage range, has good reliability and stability, has low power consumption, and the total power consumption does not exceed 5W. It can effectively monitor the humidity changes in the cabin and improve the efficiency of deep-sea operations.

[0020] 2. The electrode sheet of the present invention has a compact structure and is sensitive to reaction, and a reduction in insulation will immediately trigger an alarm.

[0021] 3. The protection circuit and glue filling measures of the present invention are simple, reliable and low-cost, ensuring that the node works normally when micro-seepage and condensation water appear in the electronic cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a connection diagram of the protection circuit of the present invention in the actual node electronic compartment.

[0023] Figure 2 It is a circuit connection diagram of the humidity sensor of the present invention in the actual node electronic cabin.

[0024] Figure 3 It is a circuit connection diagram of the electrode sheet of the present invention.

[0025] Figure 4 It is the external circuit diagram of the electrode sheet of the present invention.

[0026] Figure 5 It is a diagram of the interface for recording data of the host computer of the present invention.

[0027] Figure 6 It is a schematic diagram of a semi-physical simulation system for simulating underwater power supply according to the present invention.

[0028] Figure 7 It is the voltage value measured by the 11Ω resistor of the present invention.

[0029] Figure 8 It is the voltage value measured by the 6Ω resistor of the present invention.

[0030] Fig. 9 This is a diagram of the data uploading interface of the humidity sensor of the present invention.

[0031] Fig.10 This is a diagram of the humidity sensor uploading data interface captured during the change process of the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0033] The embodiment of the present invention specifically provides a deep sea underwater node power supply isolation protection and water leakage alarm circuit, including:

[0034] like Figure 1 As shown, a protection circuit, two wires led out from one end of the protection circuit are respectively connected to the input negative electrode, that is, the wire on the deep-sea cable through the cabin component, and the other end is connected to the negative electrode of the power module;

[0035] like Figure 2As shown, the humidity monitoring circuit is connected to the photoelectric conversion module through RS485 communication, and the photoelectric conversion module is connected to the host computer through the deep-sea cable optical fiber. The power supply ends of the humidity monitoring circuit and the photoelectric conversion module are connected to the output end of the power module; the photoelectric conversion module adopts a photoelectric transmission board: it supports RS485 to optical fiber communication, which is similar to a network switch. It mainly receives the real-time upload data of the humidity sensor through RS485, converts it into an optical signal and uploads it in real time. Combined with the optical fiber in the deep-sea cable, the humidity data is uploaded to the host computer. Alarm system: The host computer receives the humidity data in the cabin and sets the humidity threshold. If the humidity in the cabin exceeds the threshold, an alarm will be issued to notify the staff that water has entered the cabin. Due to the relatively high air humidity at the seaside, the humidity of the electronic cabin is consistent with the air humidity after the cabin is sealed, and the appearance of condensed water will cause the humidity to change rapidly, which will affect the judgment of the staff. Therefore, adding appropriate desiccant in the cabin to maintain the humidity in the cabin at a low value can absorb the water vapor brought by the condensed water on the one hand; on the other hand, if the humidity rises faster, it is directly judged as water entering the cabin.

[0036] like Figure 4 As shown, the water leakage detection circuit includes: a J302 connector, two I / O ports, a resistor R318, a resistor R319, a resistor R324 and a MOS tube AO3402; the J302 connector is connected to the electrode sheet, the terminal 1 of the J302 connector is connected to one end of the resistor R324 and the gate end of the MOS tube AO3402, the drain end of the MOS tube AO3402 is connected to the other end of the resistor R324 and is grounded GND, the source end of the MOS tube AO3402 is connected to one end of the resistor R319 and the node Leak2, the other end of the resistor R319 is connected to one of the I / O ports, the terminal 2 of the J302 connector is connected to one end of the resistor R318, the other end of the resistor R318 is connected to another I / O port, a 3.3V voltage is provided to the two I / O ports through the host computer, and the output voltage is read from the node Leak2 through the acquisition system.

[0037] Connect the two wires from the electrode to the I / O ports of the acquisition system, add MOS tube AO3402 in between, and provide 3.3V voltage to the two I / O ports through the host computer. Under normal working conditions, the acquisition system reads 3.3V from Leak2 and uploads instruction 019B to the host computer to indicate a normal state; when water leaks in the node cabin, the insulation of the electrode is reduced after it becomes wet, and a short circuit occurs at 1 / 2 of the interface. The acquisition system reads 0V from Leak2 and uploads instruction 009A to the host computer to indicate an abnormal state, triggering a water leak alarm. Figure 5 The instructions for normal and abnormal states recorded by the host computer.

[0038] The protection circuit adopts a glass tube fuse. When the current increases due to water ingress into the underwater node electronic cabin, the fuse of the protection circuit can be blown out in time, thereby realizing the power supply isolation protection of the underwater node electronic cabin. The present invention proposes to design a high-efficiency overcurrent protection circuit based on a fuse. The circuit reasonably designs the layout and parameter selection of the fuse, cooperates with the power supply line and power supply module in the electronic cabin, ensures that in the event of a short circuit, the power supply is cut off in time at the moment of current increase, ensures the operation of the system, and has good response speed and reliability.

[0039] The humidity monitoring circuit adopts a high-precision humidity sensor, which can detect the humidity changes of the environment in real time and accurately. Specifically, a DC6V-36V temperature and humidity transmitter that supports RS485 communication and standard Modbus RTU protocol is selected. The humidity sensor has high sensitivity, good stability, and full-range automatic temperature compensation. The selected chip has low power consumption, high reliability, strong anti-interference ability, and a humidity measurement range of 0-100%. RS485 communication and standard Modbus RTU protocol are adopted. The temperature and humidity sensor is equipped with a photoelectric conversion module to transmit the humidity information to the host computer through the submarine cable optical fiber, and the real-time humidity data on the host computer is observed to achieve the purpose of real-time monitoring.

[0040] The electronic cabin of the underwater node also includes a desiccant for maintaining the humidity in the cabin at a low value.

[0041] like Figure 3 As shown, the electrode sheet is installed at the lowest position in the electronic cabin of the underwater node, and the electrode sheet includes: a circuit substrate, a plurality of pads 1 and a plurality of pads 2; a plurality of pads 1 and a plurality of pads 2 are linearly and staggered in sequence at equal intervals on the circuit substrate, and the plurality of pads 1 and a plurality of pads 2 are respectively connected to the two wires of the J302 connector, and the two wires of the J302 connector are not interconnected, and the pads 1 and the pads 2 are not interconnected. The pads 1 or pads 2 at the above intervals are interconnected, and are respectively interconnected with the two wires of the connector, and the two wires are not interconnected, and the insulation value of adjacent pads is high and they are completely disconnected. When there is water leakage in the cabin, since the electrode sheet is at the lowest position, the electrode sheet will get wet at the first time, resulting in a decrease in the insulation between the wires led out of the electrode sheet.

[0042] The power supply module is a DC power supply module, whose input voltage is 375V and output voltage is 24V.

[0043] like Figure 6As shown, it also includes a 110V switching power supply, a 110V to 375V slow start circuit, three resistors and three air switches; the host computer is connected to the 110V switching power supply, the output positive and negative poles of the 110V switching power supply are connected to the input positive and negative poles of the 110V to 375V slow start circuit, the output positive pole of the 110V to 375V slow start circuit is connected to the input positive pole of three parallel DC power modules, the output negative pole of the 110V to 375V slow start circuit is connected to the input negative pole of the three parallel DC power modules, and the output negative pole of the 110V to 375V slow start circuit and the input negative pole of the three parallel DC power modules also include resistors and fuses connected in series in sequence, an air switch is connected between the input positive and negative poles of each DC power module, and the output ends of the three parallel DC power modules are respectively connected to three loads.

[0044] The resistance values ​​of the resistors connected in series to the three DC power modules are 11Ω, 16Ω and 21Ω respectively.

[0045] The specification of the fuse is 1A fuse.

[0046] The circuit board modules in the electronic cabin of the underwater node are all integrally filled with thermal conductive glue, and the thermal conductive glue is a mixture of two glues of model coolTherm SC-320LVH and coolTherm SC-320LVH HARDEN.

[0047] The following test data are also included:

[0048] 1. Protection circuit test

[0049] The protection circuit is tested with glass tube fuses, and a specific circuit board installation fuse is designed. Based on the current project, an underwater power supply semi-physical simulation system is built to test the starting current peak; by simulating branch short-circuit conditions, the fault isolation is tested to provide a basis for selecting fuse specifications for branch short-circuit isolation modules. Figure 6 It is a schematic diagram of building a semi-physical simulation system for simulating underwater power supply.

[0050] according to Figure 6 When the system power is turned on, the voltage across the 11Ω resistor is displayed on an oscilloscope. Figure 7 As shown, the voltage surges to a maximum of 17V, corresponding to a current of 1.55A; after repeated power-on tests, the starting current is between 1.45A and 1.8A.

[0051] Adjust the resistance value to 6Ω, such as Figure 8As shown, the voltage surges up to 10V, corresponding to a current of 1.67A, and the first peak pulse duration above 5V is less than 5ms. A 1A fast-blow fuse is connected to the circuit, and the power is started several times, but the fuse does not blow. It is preliminarily judged that the pulse time of the instantaneous current at startup is too short to blow the fuse.

[0052] Considering that the fuse breaking specification is as far away from the starting current peak as possible, the overcurrent protection point is designed to be increased. Figure 6 connect.

[0053] Connect a 2A fuse. After a short circuit, the fuse does not blow. The phenomenon is the same as above. The power supply output current jumps between 0 and 2A, and the fuse cannot be blown.

[0054] Connect a 1.5A fuse and short-circuit the DC module input at the first node, the second node, and the third node respectively. Test 5 times, and it did not blow once and blew 4 times, indicating that it is in a critical state.

[0055] Connect a 1A fuse and short-circuit the DC module input at the first node, second node, and third node respectively. Test 5 times and the fuse blows all 5 times.

[0056] After the fuse was blown, the output voltage of the 110V to 375V boost module was normal and the overcurrent protection was not activated. This means that when a branch short circuit occurs, the fuse will blow first, thus achieving the purpose of branch isolation.

[0057] There is a difference between the equivalent resistance simulated in the laboratory and the actual resistance characteristics. The final selection requires on-site testing to make a final decision. Indoor tests have proved that this method is reliable in the application of circuit protection.

[0058] 2. Humidity detection test

[0059] The humidity sensor is tested with the photoelectric transmission board. The host computer is used to observe whether the data can be read normally. Figure 2 connect. Fig. 9 It is the humidity data read by the host computer interface.

[0060] The upper computer can display the humidity data accurately, with an accuracy of 10 -1 Then the humidity sensor is brought close to the water surface, and the host computer observes obvious changes in humidity data. Fig.10 The screenshots are taken during the change process. The experiment proves that this method can monitor the humidity change in the environment in real time.

[0061] In summary, the deep-sea underwater node power supply isolation protection and water leakage alarm technology provided by the present invention can effectively monitor the humidity changes in the electronic cabin in the deep-sea environment and protect the operation of the entire system to the greatest extent. Through real-time monitoring and protection means, it can effectively prevent the adverse effects caused by water seepage and humidity changes, and improve the efficiency and reliability of deep-sea operations.

[0062] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A deep sea underwater node power supply isolation protection and water leakage alarm circuit, characterized in that: include: A protection circuit, wherein two wires led out from one end of the protection circuit are respectively connected to the input negative electrode, i.e., the wire on the deep-sea cable through-cabin component, and the other end is connected to the negative electrode of the power module; A humidity monitoring circuit, wherein the humidity monitoring circuit is connected to the photoelectric conversion module via RS485 communication, the photoelectric conversion module is connected to the host computer via a deep-sea cable optical fiber, and the power supply ends of the humidity monitoring circuit and the photoelectric conversion module are both connected to the output end of the power supply module; The water leakage detection circuit comprises: a J302 connector, two I / O ports, a resistor R318, a resistor R319, a resistor R324 and a MOS tube AO3402; the J302 connector is connected to an electrode sheet, a terminal 1 of the J302 connector is connected to one end of the resistor R324 and a gate end of the MOS tube AO3402, a drain end of the MOS tube AO3402 is connected to the other end of the resistor R324 and is grounded GND, a source end of the MOS tube AO3402 is connected to one end of the resistor R319 and a node Leak2, the other end of the resistor R319 is connected to one of the I / O ports, a terminal 2 of the J302 connector is connected to one end of the resistor R318, the other end of the resistor R318 is connected to another I / O port, a 3.3V voltage is provided to the two I / O ports through a host computer, and an output voltage is read from the node Leak2 through a collection system.

2. A deep sea underwater node power supply isolation protection and water leakage alarm circuit as claimed in claim 1, characterized in that: The protection circuit adopts a glass tube fuse. When the current increases due to water ingress into the underwater node electronic cabin, the fuse of the protection circuit can be burned out in time, thereby realizing power supply isolation protection of the underwater node electronic cabin.

3. A deep sea underwater node power supply isolation protection and water leakage alarm circuit as claimed in claim 1, characterized in that: The humidity monitoring circuit adopts a high-precision humidity sensor, specifically a DC6V-36V temperature and humidity transmitter that supports RS485 communication and standard Modbus RTU protocol.

4. A deep sea underwater node power supply isolation protection and water leakage alarm circuit as claimed in claim 1, characterized in that: The electronic cabin of the underwater node also includes a desiccant for maintaining the humidity in the cabin at a low value.

5. A deep sea underwater node power supply isolation protection and water leakage alarm circuit as claimed in claim 1, characterized in that: The electrode sheet is installed at the lowest position in the electronic cabin of the underwater node, and the electrode sheet includes: a circuit substrate, a plurality of pads 1 and a plurality of pads 2; a plurality of pads 1 and a plurality of pads 2 are linearly and evenly arranged on the circuit substrate in an alternating manner, and the plurality of pads 1 and the plurality of pads 2 are respectively connected to the two wires of the J302 connector, and the two wires of the J302 connector are not interconnected, and the pads 1 and the pads 2 are not interconnected.

6. A deep sea underwater node power supply isolation protection and water leakage alarm circuit as claimed in claim 1, characterized in that: The power supply module is a DC power supply module, whose input voltage is 375V and output voltage is 24V.

7. A deep sea underwater node power supply isolation protection and water leakage alarm circuit as claimed in claim 1, characterized in that: It also includes a 110V switching power supply, a 110V to 375V slow start circuit, three resistors and three air switches; the host computer is connected to the 110V switching power supply, the output positive and negative poles of the 110V switching power supply are connected to the input positive and negative poles of the 110V to 375V slow start circuit, the output positive pole of the 110V to 375V slow start circuit is connected to the input positive pole of three parallel DC power modules, the output negative pole of the 110V to 375V slow start circuit is connected to the input negative pole of the three parallel DC power modules, and the output negative pole of the 110V to 375V slow start circuit and the input negative pole of the three parallel DC power modules also include resistors and fuses connected in series in sequence, an air switch is connected between the input positive and negative poles of each DC power module, and the output ends of the three parallel DC power modules are respectively connected to three loads.

8. A deep sea underwater node power supply isolation protection and water leakage alarm circuit as described in claim 7, characterized in that: The resistance values ​​of the resistors connected in series to the three DC power modules are 11Ω, 16Ω and 21Ω respectively.

9. A deep sea underwater node power supply isolation protection and water leakage alarm circuit as claimed in claim 7, characterized in that: The specification of the fuse is 1A fuse.

10. A deep sea underwater node power supply isolation protection and water leakage alarm circuit as claimed in any one of claims 1 to 9, characterized in that: The circuit board modules in the electronic cabin of the underwater node are all integrally filled with thermal conductive glue, and the thermal conductive glue is a mixture of two glues of model coolTherm SC-320LVH and coolTherm SC-320LVH HARDEN.

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