Water entry detection system

Abstract

The invention discloses a water entry detection system, which comprises a power supply module used for providing stable voltage for a water entry detection system block; the sensing mechanism is provided with a body and an elastic water entry probe which are connected with the ground GND and the detection end of the water entry detection module respectively, and the elastic water entry probe is isolated from the body and used for conducting the water entry detection module by using water as a conducting medium between the body and the elastic water entry probe after water entry; the water entry detection module is used for generating a continuous square wave signal after being conducted and providing the continuous square wave signal to the main control module; and the main control module is used for determining whether the system enters water or not by circularly detecting the square wave signal. The complexity of the water entry detection circuit can be reduced, the power consumption of the circuit is reduced, and the size of the water entry device is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of fuzes, and in particular relates to a water entry detection system. Background Art

[0002] With the rapid development of science and technology, the modern battlefield environment has undergone tremendous changes, and the new military revolution has accelerated the transformation to the information battlefield. The future battlefield will be diversified, and future wars will shift more from land battles to sea battles and air battles. Compared with air threats, underwater threats are more deadly. Hydroacoustic countermeasure ammunition is a new type of anti-torpedo bomb developed to effectively counter torpedoes. It is composed of a large number of jamming bullets. The mother bomb contains a number of countermeasure bullets. Each bullet is equipped with high-energy explosives. The mother bomb is launched by a ship or a coastal turret, and the rocket booster is used to launch it to the predetermined sky to scatter the bullets. When the bullet enters the water, the induction system on the bullet controls the bullet to detonate at the right time and form a continuous explosion noise, thereby interfering with the torpedo sonar system, reducing or even destroying its target detection and identification capabilities.

[0003] A fuze is a device used in ammunition designed to detonate or apply a force to ignite, detonate, or deflagrate a charge under specific conditions.

[0004] The timely and continuous detonation of the underwater acoustic countermeasure ammunition bullet after entering the water requires high-precision circuit control. The fuze is required to control the controlled object in a timely manner according to environmental information, which is important for underwater acoustic countermeasure ammunition. Affected by its own working conditions, considering the water volume and power consumption, it is crucial to design the water entry detection circuit and structure in a miniaturized, simplified and low-power design. Summary of the invention

[0005] The object of the present invention is to provide a water ingress detection system to solve the problem of high power consumption of the water ingress detection circuit and the complexity of the water ingress detection circuit and structure, thereby reducing the volume of the water ingress detection device.

[0006] The technical solution to achieve the purpose of the present invention is:

[0007] A water intrusion detection system, comprising:

[0008] A power module is used to provide a stable voltage for the water intrusion detection system block;

[0009] The sensing mechanism is provided with a body and an elastic water entry probe respectively connected to the ground GND of the water entry detection module and the detection end, wherein the elastic water entry probe is isolated from the body and is used to use water as a conducting medium between the body and the elastic water entry probe after entering water, so that the water entry detection module is turned on;

[0010] The water intrusion detection module is used to generate a continuous square wave signal after being turned on and provide it to the main control module;

[0011] The main control module detects the square wave signal in a loop to determine whether the system has entered water.

[0012] Compared with the prior art, the present invention has the following significant advantages:

[0013] The water intrusion detection circuit and sensing mechanism provided in the embodiment of the present invention can provide high-precision water intrusion detection by connecting the water intrusion detection circuit and the sensing mechanism, using a battery to stably supply power through a power module, and inputting a signal into a main control chip; at the same time, the overall size is reduced, the volume of the water intrusion device is reduced, the mechanism is simplified through the coordination of the circuit and the mechanism, and the problem of high power consumption of the water intrusion detection circuit is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic block diagram of a water intrusion detection system provided by an embodiment of the present invention;

[0015] Figure 2 is a structural diagram of a sensing mechanism provided by an embodiment of the present invention;

[0016] Figure 3 is a side view of a sensing mechanism probe provided by an embodiment of the present invention;

[0017] Figure 4 is a cross-sectional view of a sensing mechanism probe provided by an embodiment of the present invention;

[0018] Figure 5 is a circuit diagram of a main control module and a power supply module provided in an embodiment of the present invention;

[0019] Figure 6 is a partial circuit diagram of a main control module provided by an embodiment of the present invention;

[0020] Figure 7 is a partial circuit diagram of a power module provided by an embodiment of the present invention;

[0021] Figure 8 is a circuit diagram of a water intrusion detection module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] Figure 1A schematic block diagram of a water intrusion detection system provided by an embodiment of the present invention, comprising a sensing mechanism 1, a main control module 2, a power supply module 3, and a water intrusion detection module 4;

[0024] Specifically, the water ingress detection module 4 is connected to the sensing mechanism 1. When the sensing mechanism 1 enters water, the water ingress detection module 4 generates a square wave signal. A pin of the main control chip U1 of the main control module 2 is connected to the output end of the water ingress detection module 4 to receive the square wave signal output by the water ingress detection module 4.

[0025] Figure 2 The structural diagram of the sensing mechanism provided in the embodiment of the present invention includes a body 11, a power board 12 (PCB board), a water ingress probe 13, and a rubber sealing ring 14. The body 11 is connected to the ground GND of the water ingress detection module 4 through the power board 12, the power board 12 is welded on the body 11, the water ingress probe 13 is welded on two welding points of the power board 12, and is isolated from the body 11, and the rubber sealing ring 14 is sleeved on the water ingress probe 13 to prevent the water ingress probe 13 from contacting and conducting with the body 11 in advance due to welding problems or misuse, thereby causing false triggering of water ingress detection.

[0026] Specifically, refer to Figure 3 , Figure 4 The water probe 13 includes a metal probe 131, a metal sleeve 132, and a spring 133. The metal probe 131 is installed in the metal sleeve 133 and can be extended and retracted relative to the metal sleeve 133. The spring 133 is supported below. The bottom of the spring 133 contacts the bottom of the metal sleeve 132 shell. The bottom of the metal sleeve 132 shell is welded to the power board 12 and connected to the water ingress detection module 4 through the internal wiring of the wiring board 12. In the normal state, the metal probe 131 is extended, and due to the limited position at the bottom, it will not be separated from the metal sleeve 132. When the sensing mechanism falls into water, the metal probe 131 will be compressed and retracted into the metal sleeve 132 by the spring 133 under overload impact, which acts as a buffer to prevent the probe from breaking under high impact and affecting the reliability of the sensing mechanism; after entering the water, the metal probe 131 extends out of the metal sleeve 132 to increase the contact area with water, and the water probe 13 is connected to the main body 11 through water to form a closed loop with the same electric potential, and a square wave signal is generated through the water entry detection module 4 to detect water entry.

[0027] It should be noted that the surfaces of the metal probe 131 and the metal sleeve 132 are gold-plated to enhance the conductivity of the sensing mechanism in water and improve the reliability of water entry detection.

[0028] Figure 5 is a circuit diagram of a main control module and a power supply module provided in an embodiment of the present invention, Figure 5 It includes a main control module 2 and a power supply module 3. Figure 6is a partial circuit diagram of the main control module 2 provided in an embodiment of the present invention, including capacitor C1, capacitor C2, passive crystal oscillator X1, and main control chip U1; Figure 5 , Figure 6 , the P3.1 pin and P3.2 pin of the main control chip U1 of the main control module 2 are TXD and RXD respectively, which are used for program burning and serial port communication. The clock source 21 includes a passive crystal oscillator X1 and capacitors C1 and C2. Capacitor C1 is connected to one end of the passive crystal oscillator X1, and capacitor C2 is connected to the other end of the passive crystal oscillator X1. The other ends of capacitors C1 and C2 are grounded GND together. Pins P1.6 and P1.7 of the main control chip U1 are respectively connected to the two ends of the clock source passive crystal oscillator X1 (21). The passive crystal oscillator X1 needs to be connected to the oscillation circuit inside the main control chip with the help of an external clock circuit to generate an oscillation signal. It cannot oscillate by itself. The two external capacitors C1 and C2 can fine-tune the clock frequency generated by the crystal oscillator. Pin 211 of the passive crystal oscillator X1 is connected to pin P1.6 of the main control chip U1, and pin 212 is connected to pin P1.7. The last pin is grounded GND. Among them, pin 211 and pin 212 are respectively connected to the input end and output end of the reverse amplifier inside the main control chip U1.

[0029] Specifically, the frequency of the passive crystal oscillator X1 is 24 MHz, and the capacitors C1 and C2 are load compensation capacitors with a capacitance of 18 pF.

[0030] Figure 7 This is a partial circuit diagram of the power module 3 provided in an embodiment of the present invention, including a battery BAT+, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a voltage regulator chip U2, and a resistor R18. Figure 5 , Figure 7, capacitor C3, capacitor C14, capacitor C15, capacitor C16, capacitor C21, capacitor C22, capacitor C23, capacitor C24, and capacitor C25 are connected in parallel and connected to the power input terminal 31 of the battery BAT+. The power input terminal 31 supplies power to the entire water ingress detection circuit. The capacitors C3, capacitor C14, capacitor C15, capacitor C16, capacitor C21, capacitor C22, capacitor C23, capacitor C24, and capacitor C25 are connected in parallel, and one end of the parallel connection is connected to the power input terminal 31, and the other end is grounded GND, which is used as an energy storage capacitor to prevent the circuit from being cut off due to water impact and high impact caused by the working environment, causing the main control chip U1 to reset. Further, the energy storage capacitor can compensate for about 10 0-200ms power off, one end of the energy storage capacitor and the power input terminal 31 are connected to the input terminal 323 of the voltage regulator chip U2, the other end of the energy storage capacitor and the ground terminal 321 of the voltage regulator chip U2 are grounded to GND, the output terminal 322 of the voltage regulator chip U2 outputs a 3.3V voltage, the voltage regulator chip U2 stabilizes the battery power supply to 3.3V and outputs it to the VCC power supply terminal 33 and the main control chip U2 power supply terminal 34, the main control chip U1 power supply terminal 34 is connected to the Vcc pin of the main control chip U1, the VCC power supply terminal 33 is connected to the water intrusion detection module 4, the capacitor C4 and the capacitor C5 are connected in parallel, and after parallel connection, one end is connected to the ADC pin of the main control chip U1 and the VCC power supply terminal 33, and the other end is grounded to GND, which is used as a filter capacitor to filter high-frequency interference. One end of the resistor R18 is connected to the Gnd pin of the main control chip U1, and the other end is connected to the ground GND. During the operation of the circuit, the ground potential increases, and the voltage difference between the ADC pin of the main control chip U1 and the GND terminal decreases, resulting in failure to provide sufficient normal operating voltage for the main control chip, and power-off reset. The resistor R18 can effectively prevent the increase in ground potential from affecting the Gnd terminal of the main control chip U1. It should be noted that the external reference power pin of the ADC of the main control chip U1 must not be floating, and must be connected to an external reference power supply or directly connected to VCC.

[0031] Figure 8 : is a circuit diagram of a water ingress detection module provided by an embodiment of the present invention, including a resistor R25, a resistor R26, a resistor R27, a resistor R28, a PNP transistor Q6, and a bidirectional TVS transient suppression diode DR1. Figure 7 , Figure 8The VCC power supply end 33 is connected to the resistor R25, one end of the resistor R26 and the emitter 42 of the PNP transistor Q6. The other end of the resistor R26 is connected to one end of the resistor R27 and the collector 41 of the PNP transistor Q6. The other end of the resistor R27 is the probe detection end DET+, which is connected to the probe 13 of the sensing mechanism 1. The other end of the resistor R25 is connected to the probe detection end DET+, and then connected to one end of the bidirectional TVS transient suppression diode DR1. The collector 43 of the PNP transistor Q6 is connected in series with the resistor R28 and is grounded together with the other end of the bidirectional TVS transient suppression diode DR1. The resistor R28 has the same function as the resistor R18. The P3.3 pin of the main control chip U1 is connected to the collector 43 of the PNP transistor Q6. The collector 43 of the PNP transistor Q6 is used to output a square wave signal, which is input into the main control chip U1 to detect whether the sensing mechanism 1 is immersed in water.

[0032] Furthermore, the bidirectional TVS transient suppression diode DR1 is a high-efficiency circuit protection device that can absorb instantaneous large pulse power in both positive and negative directions and clamp the voltage to a predetermined level. For the power supply plus TVS tube, especially for some exposed interfaces, when these interfaces are contact-discharged, static electricity can easily be connected to the power line, and the static electricity changes from the original common mode to the differential mode. At this time, a very high spike will be generated on the power supply, and many chips cannot withstand it, resulting in freezes, resets and other problems. For the electrostatic discharge that may be generated at the probe detection terminal DET+ and the ground terminal, a TVS tube can be connected in parallel to protect the VCC power supply terminal 33 from electrostatic discharge. The resistance value of the resistor R25 is in the megohm level, which cooperates with the TVS tube to limit the electrostatic discharge current.

[0033] It should be noted that the conduction condition of the PNP transistor Q6 is that the emitter potential is higher than the collector potential by 0.95V, the resistors R26 and R27 are used for voltage division, the VCC power supply terminal 33 outputs 3.3V, and the resistance ratio of the resistors R26 and R27 is 10. After the sensing mechanism enters the water, the voltage difference between the emitter 42 and the collector 43 of the PNP transistor Q6 is 3V, and the PNP transistor Q6 is turned on.

[0034] For example, before the sensing mechanism enters the water, the VCC power supply terminal 33 outputs 3.3V. At this time, the emitter 42 and the collector 43 of the PNP transistor Q6 have equal potentials, the voltage difference is 0, the PNP transistor Q6 is in the cut-off state, and the P3.3 pin of the main control chip U1 will not receive the square wave signal; the probe detection terminal DET+ is connected to the water probe 13 through the power board 12, and the body 11 is grounded. After the sensing mechanism enters the water, the water probe 13 uses water as a conductor and is connected to the body 11. At this time, it is equivalent to the probe detection terminal DET+ being connected to GND, and V The CC power supply terminal 33, resistors R26, resistors R27 and GND form a loop, resistors R26, resistors R27 divide the voltage, the voltage difference between the emitter 42 and the collector 43 of the PNP transistor Q6 is 3V, the PNP transistor Q6 is turned on, and the P3.3 pin of the main control chip U1 receives a square wave signal, and the main control chip determines that the sensing mechanism 1 has entered water. It should be noted that under the control of the setting program, it is set to cyclic detection, and the square wave signal is a continuous signal, which can realize continuous detection, and can improve the accuracy of water entry judgment of the water entry detection circuit.

[0035] It should be noted that the overall volume of the sensing mechanism 1 is about 10 cubic centimeters, the probe 13 is 2 mm high, the maximum radius of the bottom of the metal sleeve 132 is 4 mm, the structure is simple, the processing difficulty is relatively low, and the welding and assembly process is simple; the total board thickness of the PCB board and components of the water ingress detection circuit is about 6 mm, and the diameter of the circular PCB board is 25 mm, which realizes the miniaturization of the water ingress detection circuit and the sensing mechanism, and greatly reduces the volume of the water ingress equipment; the battery BAT+ has a capacity specification of 3.1V and a volume of about 1.5 square centimeters. After being powered by the battery, the operating voltage of the water ingress detection circuit is 3.3V, the operating current is 8mA~15mA, and the power consumption is relatively small. The battery BAT+ can provide the water ingress detection circuit with at least 3 rounds of operation at -27°C. This invention has low requirements on the power supply environment and power supply, and solves the problem of high power consumption of the water ingress detection circuit.

[0036] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A water entry detection system, characterized in that: include: A power module is used to provide a stable voltage for the water intrusion detection system block; The sensing mechanism is provided with a body and an elastic water entry probe respectively connected to the ground GND of the water entry detection module and the detection end, wherein the elastic water entry probe is isolated from the body and is used to use water as a conducting medium between the body and the elastic water entry probe after entering water, so that the water entry detection module is turned on; The water intrusion detection module is used to generate a continuous square wave signal after being turned on and provide it to the main control module; The main control module detects the square wave signal in a loop to determine whether the system is submerged in water.

2. The water intrusion detection system according to claim 1, characterized in that: The main body is provided with a power board, which is connected to the ground GND of the water ingress detection module, and the elastic water ingress probe is welded on the power board; The water ingress detection module includes resistor R25, resistor R26, resistor R27, resistor R28, PNP transistor Q6, and bidirectional TVS transient suppression diode DR1; one end of the resistor R25, resistor R26 and the emitter of the PNP transistor Q6 are connected to the power supply module, and the other end of the resistor R26 is connected to one end of the resistor R27 and the collector of the PNP transistor Q6; the other end of the resistor R27 is the probe detection end DET+, which is connected to the elastic water ingress probe; the other end of the resistor R25 is connected to the probe detection end DET+, and then connected to one end of the bidirectional TVS transient suppression diode DR1; the collector of the PNP transistor Q6 is connected in series with resistor R28 and then grounded together with the other end of the bidirectional TVS transient suppression diode DR1, and the collector of the PNP transistor Q6 is connected to the main control module.

3. The water intrusion detection system according to claim 1 or 2, characterized in that: The elastic water entry probe comprises a metal probe, a metal sleeve and a spring; The metal probe is arranged in the metal sleeve and can be extended and retracted relative to the metal sleeve but cannot be separated; a spring support is arranged below the metal probe, and the bottom of the spring contacts the bottom of the metal sleeve shell.

4. The water intrusion detection system according to claim 3, characterized in that: A limit stop is provided at the bottom of the metal probe so that the metal probe cannot be separated from the metal sleeve.

5. The water intrusion detection system according to claim 3, characterized in that: The surfaces of the metal probe and the metal sleeve are gold-plated.

6. The water intrusion detection system according to claim 1, characterized in that: The main control module includes capacitor C1, capacitor C2, passive crystal oscillator X1, and main control chip U1; capacitor C1 is connected to one end of the passive crystal oscillator X1, capacitor C2 is connected to the other end of the passive crystal oscillator X1, and the other ends of capacitor C1 and capacitor C2 are commonly grounded GND; pins P1.6 and P1.7 of the main control chip U1 are respectively connected to the two ends of the clock source passive crystal oscillator X1.

7. The water intrusion detection system according to claim 6, characterized in that: The frequency of the passive crystal oscillator X1 is 24 MHz, and the capacitances of the capacitors C1 and C2 are 18 pF.

8. The water intrusion detection system according to claim 1, characterized in that: The power module includes a battery BAT+, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C21, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25, a voltage stabilizing chip U2, and a resistor R18; The capacitors C3, C14, C15, C16, C21, C22, C23, C24 and C25 are connected in parallel, and one end of the parallel connection is connected to the power input end, and the other end is grounded GND, so as to be used as energy storage capacitors; one end of the energy storage capacitor and the power input end are connected to the input end of the voltage stabilizing chip U2, and the other end of the energy storage capacitor and the ground end of the voltage stabilizing chip U2 are grounded GND together; the voltage stabilizing chip outputs the battery power supply to the VCC power supply end and the main control module after stabilization, and the VCC power supply end is connected to the water ingress detection module; the capacitors C4 and C5 are connected in parallel, and one end of the parallel connection is connected to the main control module and the VCC power supply end, and the other end is grounded GND; one end of the resistor R18 is connected to the main control module, and the other end is grounded GND.

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