CN218633336U - Multifunctional shipborne terminal with surge prevention function and capable of being upgraded remotely on line - Google Patents

Abstract

The utility model discloses a possess anti-surge, can long-range multi-functional shipborne terminal of upgrading on line, be applied to big dipper communication field. The utility model provides a possess prevent surge, but multi-functional shipborne terminal of long-range online upgrading, include: the device comprises an MCU, an RNSS module, an RDSS module, a serial port communication unit, a voltage converter and a surge protection circuit; the input end of the surge protection circuit is connected with an external power supply, and the output end of the surge protection circuit is connected with the voltage converter and used for reducing the surge voltage to a preset range and releasing surge current when the surge voltage is generated. The surge protection circuit can reduce surge voltage to the within range that does not harm the circuit under the condition that thunderstorm weather produced surge voltage to can release surge current, avoid the terminal to receive voltage too big and lead to the terminal to damage, promote the security at terminal, guarantee that shipborne terminal also can continuation work under adverse circumstances, reduce the cost of maintenance in later stage.

Description

Multifunctional shipborne terminal with surge prevention function and capable of being upgraded remotely on line

Technical Field

The utility model relates to a big dipper communication field especially relates to a possess prevent surge, can long-range multi-functional shipborne terminal of upgrading on line.

Background

With the prosperity and development of modern ship transportation industry, the development of ships combined with large-scale, intelligent and high-speed, people need to establish good communication and ship monitoring with ships to deal with the natural environment and various sudden artificial events. The Beidou satellite navigation system is a global positioning and communication system which is developed by China, is mature day by day, has the capability of covering the whole world, and is reflected in various scenes such as ocean transportation, road transportation and the like.

In the face of increasingly complex environments of the shipping industry, the shipping industry needs to be combined with the Beidou satellite navigation system, and a short message communication service of the Beidou satellite navigation system is utilized to become a good data transmission means. In present big dipper market, equipment that boats and ships combine big dipper satellite is with MCU as the core, carries on big dipper RDSS module and RNSS module, carries out information interaction through UART interface transmission big dipper agreement statement and other peripheral hardware. However, the equipment does not have the function of surge resistance, the surge resistance is weak when the equipment is sailed on the sea, the equipment is easily damaged due to surge voltage in thunderstorm weather, and the later maintenance cost is high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a but possess anti-surge, long-range online upgrade multi-functional shipborne terminal, under thunderstorm weather, can the anti-lightning for the terminal can resist the surge, has guaranteed that the terminal lasts the nature work under adverse circumstances such as thunderstorm, avoids shipborne terminal to produce and damages and lead to the cost of maintenance in later stage higher.

In order to solve the technical problem, the utility model provides an possess prevent the surge, can long-range online upgrade multi-functional shipborne terminal, should possess prevent the surge, can long-range online upgrade multi-functional shipborne terminal includes: the device comprises an MCU, an RNSS module, an RDSS module, a serial port communication unit, a voltage converter and a surge protection circuit;

the input end of the surge protection circuit is connected with an external power supply, and the output end of the surge protection circuit is connected with the voltage converter and used for reducing the surge voltage to a preset range and releasing surge current when the surge voltage is generated.

Preferably, the method further comprises the following steps: a protection circuit;

the input end of the protection circuit is connected with the output end of the surge protection circuit, and the output end of the protection circuit is connected with the voltage converter and used for disconnecting the protection circuit when the electric signal in the protection circuit does not meet the preset requirement.

Preferably, the protection circuit includes: an anti-reverse connection circuit;

the input end of the reverse connection preventing circuit is connected with the output end of the surge protection circuit, and the output end of the reverse connection preventing circuit is connected with the voltage converter and used for disconnecting the reverse connection preventing circuit when the positive pole and the negative pole of an external power supply are connected with the reverse connection preventing circuit mistakenly.

Preferably, the protection circuit further includes: an overvoltage and undervoltage protection circuit;

the input end of the overvoltage and undervoltage protection circuit is connected with the output end of the anti-reverse-connection circuit, and the output end of the overvoltage and undervoltage protection circuit is connected with the voltage converter and used for disconnecting the overvoltage and undervoltage protection circuit under the condition that the overvoltage and undervoltage protection circuit is overvoltage or undervoltage.

Preferably, the surge protection circuit includes: the gas discharge lamp comprises a first resistor, a gas discharge tube, a first diode and a first inductor;

the first end of the first resistor is connected with an external power supply and the first end of the first inductor, and the second end of the first resistor is connected with the first end of the gas discharge tube;

the second end of the gas discharge tube is connected with the second end of the first diode and the ground wire;

the second end of the first inductor is connected with the first end of the first diode, and the common end of the first inductor and the first diode is used as the output end of the surge protection circuit.

Preferably, the reverse connection preventing circuit includes: the first PMOS tube, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the ninth resistor, the second diode, the third diode, the fourth diode, the fifth diode, the first triode, the second triode and the first capacitor;

the drain electrode of the first PMOS tube is used as the input end of the reverse-connection preventing circuit and is connected with the anode of the second diode, the grid electrode of the first PMOS tube is connected with the first end of the second resistor and the second end of the third resistor, and the source electrode of the first PMOS tube is connected with the cathode of the second diode, the first end of the third resistor, the first end of the fourth resistor, the first end of the fifth resistor, the emitter of the first triode, the cathode of the fifth diode and the first end of the ninth resistor;

the common end of the first PMOS tube, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the first triode, the fifth diode and the ninth resistor is used as the output end of the anti-reverse-connection circuit;

the second end of the second resistor is grounded;

the second end of the fourth resistor is connected with the cathode of the third diode;

the anode of the third diode is connected with the first end of the first capacitor, the first end of the seventh resistor and the base of the second triode;

the second end of the first capacitor is connected with the second end of the seventh resistor, the emitting electrode of the second triode and the ground wire;

the second end of the fifth resistor is connected with the first end of the sixth resistor and the cathode of the fourth diode;

the anode of the fourth diode is grounded;

the second end of the sixth resistor is connected with the base electrode of the first triode;

a collector of the first triode is connected with an anode of the fifth diode, a second end of the ninth resistor and a first end of the eighth resistor;

and the second end of the eighth resistor is connected with the collector of the second triode.

Preferably, the overvoltage/undervoltage protection circuit comprises: the second PMOS tube, a sixth diode, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor;

the source electrode of the second PMOS tube is connected with the source electrode of the first PMOS tube, the cathode of the sixth diode, the first end of the third resistor, the first end of the fourth resistor, the first end of the fifth resistor, the emitter of the first triode, the cathode of the fifth diode and the first end of the ninth resistor, the grid electrode of the second PMOS tube is connected with the second end of the ninth resistor, the first end of the eighth resistor, the anode of the fifth diode and the collector of the first triode, and the drain electrode of the second PMOS tube is connected with the anode of the sixth diode, the first end of the second capacitor, the first end of the third capacitor, the first end of the fourth capacitor and the first end of the fifth capacitor;

the common end of the second PMOS tube, the sixth diode, the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor is used as the output end of the overvoltage and undervoltage protection circuit;

the second end of the second capacitor is connected with the second end of the third capacitor, the second end of the fourth capacitor, the second end of the fifth capacitor and the ground wire.

Preferably, the method further comprises the following steps: the 4G module and the Bluetooth module;

one end of the 4G module is connected with one end of the MCU through a UART interface, and the other end of the 4G module is connected with the voltage converter and used for remotely updating the shipborne terminal;

one end of the Bluetooth module is connected with one end of the MCU through the UART interface, and the other end of the Bluetooth module is connected with the voltage converter and used for updating the shipborne terminal.

Preferably, the method further comprises the following steps: the device comprises an acceleration sensor, a temperature sensor and a watchdog module;

one end of the acceleration sensor is connected with the voltage converter, and the other end of the acceleration sensor is connected with the MCU and used for receiving attitude information of the shipborne terminal;

one end of the temperature sensor is connected with the voltage converter, and the other end of the temperature sensor is connected with the MCU and used for acquiring temperature signals;

the watchdog module is connected with the MCU and used for preventing the program from running away to cause the shipborne terminal to crash.

Preferably, the method further comprises the following steps: a FLASH storage module;

the FLASH storage module is connected with the MCU and used for storing data information when no external power supply is accessed.

The utility model provides a possess prevent surge, can long-range online upgrade multi-functional shipborne terminal, this shipborne terminal includes: the device comprises an MCU, an RNSS module, an RDSS module, a serial port communication unit, a voltage converter and a surge protection circuit; the input end of the surge protection circuit is connected with an external power supply, and the output end of the surge protection circuit is connected with the voltage converter and used for reducing the surge voltage to a preset range and releasing surge current when the surge voltage is generated. The surge protection circuit can reduce surge voltage to the within range that does not harm the circuit under the condition that thunderstorm weather produced surge voltage to can release surge current, avoid the terminal to receive voltage too big and lead to the terminal to damage, promote the security at terminal, guarantee that shipborne terminal also can continuation work under adverse circumstances, reduce the cost of maintenance in later stage.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious to those skilled in the art that other drawings can be obtained based on these drawings without inventive work.

FIG. 1 is a schematic diagram of a host computer according to the present invention;

fig. 2 is a structural diagram of a multifunctional shipborne terminal which has surge protection and can be remotely upgraded on line, provided by the embodiment of the utility model;

FIG. 3 is a working schematic diagram of a Beidou system provided by the embodiment of the present invention;

fig. 4 is a structural diagram of a big dipper RDSS module provided by the embodiment of the present invention;

fig. 5 is a structural diagram of a power management unit provided by an embodiment of the present invention;

FIG. 6 is a circuit diagram of a circuit protection in a multifunctional shipborne terminal with surge protection and remote online upgrade provided by another embodiment of the present application;

fig. 7 is a structural diagram of a multifunctional shipborne terminal with surge protection and remote online upgrade according to another embodiment of the present invention;

fig. 8 is a structural diagram of a multifunctional shipborne terminal host with surge protection and remote online upgrade according to another embodiment of the present invention;

wherein the reference numbers are as follows:

the system comprises an MCU (microprogrammed control unit) 1, a power supply management unit 2, an RNSS (radio network subsystem) module 3, a serial port chip 4, a main control unit 5, an external power supply 9-36V 6, an overvoltage, undervoltage and reverse connection prevention and surge protection circuit 7, a DC-DC-5V 8, a DC-DC-12V 9, a DC-DC-3.8V 10, a 4G module 11, a DC-DC-3.3V 12, a Beidou function module 13, a Bluetooth module 14, an RNSS module 15, a watchdog 16, a FLASH17, an acceleration sensor 18, a GPS (global position system), a BDS (global position system) 20, an RDSS module 21, a temperature sensor 22, a notebook computer 23, a surge protection circuit 100, an external power supply 101 and a voltage converter 102.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment in the utility model, under the prerequisite that does not make creative work, all other embodiments that obtained of ordinary skilled person in the art all belong to the utility model discloses protection scope.

The Beidou satellite navigation system is a global positioning and communication system which is researched and developed by people in China, and becomes a satellite navigation system which is parallel to three satellite navigation systems, namely a GPS satellite navigation system, a GLONASS satellite navigation system and a Galileo satellite navigation system. The Beidou third-class system engineering is successfully built at present, a satellite navigation system has the capability of covering the global field, the Beidou satellite navigation system has the characteristic and the advantage of short message communication service, the Beidou system can inform a user of time and place, and can also send data through a satellite in a short message mode, and the satellite communication means is a good data transmission means in a region without public network coverage.

With the prosperity and development of the modern shipping industry, the shipping industry is gradually combined with the Beidou satellite navigation system, so that people can establish good communication with ships and monitor the ships, and can deal with various natural environments and various sudden artificial events. FIG. 1 is a schematic diagram of a host computer according to the present invention; as shown in fig. 1, in the existing beidou market, the beidou market mainly includes a power management Unit 2, a Micro Control Unit (MCU), a beidou Unit and a serial communication Unit, and with the MCU1 as a core, a beidou satellite Radio Navigation System (RNSS) module and a satellite Radio Determination System (RDSS) module are carried on, and information interaction is performed with other peripherals by transmitting beidou protocol statements through a UART interface.

It should be noted that the utility model provides a ship-borne terminal based on the Beidou No. three system engineering,

the core of the utility model is to provide a possess prevent the surge, can long-range online upgrade multi-functional shipborne terminal, through increase surge protection circuit in power management unit, external power source is connected to surge protection circuit's input, and the voltage converter among the power management unit is connected to surge protection circuit's output, when producing surge voltage, reduces surge voltage to the preset range in to the surge current of releasing, makes the utility model provides a shipborne terminal can resist 4KV thunderbolt, has greatly improved the security at this shipborne terminal.

In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.

The utility model provides a possess anti-surge, can long-range online upgrade multi-functional shipborne terminal, shipborne terminal carries on No. three satellite system of big dipper, and shipborne terminal includes: MCU1, RNSS module 3, RDSS module, serial communication unit, voltage converter and surge protection circuit. Fig. 2 is a structural diagram of a multifunctional shipborne terminal which has surge protection and can be remotely upgraded on line, provided by the embodiment of the utility model; as shown in fig. 2, an input terminal of the surge protection circuit 100 is connected to an external power source 101, and an output terminal of the surge protection circuit 100 is connected to a voltage converter 102, for reducing the surge voltage to a preset range and discharging the surge current when the surge voltage is generated.

In specific implementation, fig. 3 is a working schematic diagram of a beidou system provided by the embodiment of the present invention; as shown in fig. 3, the Beidou third-generation shipborne terminal can obtain accurate time by using a Beidou satellite, and simultaneously, the Beidou RDSS system is used for carrying out short message communication to transmit data to a data platform. Fig. 4 is a structural diagram of a big dipper RDSS module provided by the embodiment of the present invention; as shown in fig. 4, the antenna transmits the received Beidou satellite signal to the Beidou module through processing, the RDSS module in the Beidou module carries out low-noise amplification and down-conversion processing on the Beidou signal, the signal carrier frequency is reduced, and the internal baseband processing module and the positioning settlement module complete signal encryption, decryption and processing work. Where the LNA is a low noise amplifier, the LNA is operative to pick up extremely weak and indeterminate signals from the antenna, typically on the order of a few volts or less than-100 db, and amplify the signals to a more useful level, typically 0.5-1v.

Fig. 5 is a structural diagram of a power management unit provided by an embodiment of the present invention; as shown in figure 5, external power source is 9-36V, provides the power input scope that can supply the selection of on-board terminal in order to ensure the adaptation, because when the ship was sailed on the sea, thunderstorm weather often can appear, and produced surge voltage and lead to the damage of on-board equipment, based on this, the utility model provides an on-board terminal increases 4 grades of surge protection circuit 100 at the terminal interface, makes the terminal can resist 4KV thunderbolt, has greatly improved terminal equipment's security. The input end of the surge protection circuit 100 is connected with the external power supply 6 of 9-36V, the output end of the surge protection circuit 100 is connected with the voltage converter 102, the voltage output by the surge protection circuit 100 is input into the voltage converter 102, and the voltage converter 102 has various specifications, such as voltage converters DC-DC of 5V, 12V, 3.3V and 3.8V in FIG. 5. The voltage converted by the 5V voltage converter 102 is supplied to the RNSS module 15, the RDSS module, the bluetooth module 14, the watchdog 16 and the 3.3V voltage converter 102, the voltage converted by the 3.8V voltage converter 102 is supplied to the 4G module 11, and the voltage converted by the 3.3V voltage converter 102 is supplied to the MCU1, the serial chip 4 and the FLASH17.

The surge protection circuit 100 provided by the present embodiment includes: the gas discharge lamp comprises a first resistor, a gas discharge tube, a first diode and a first inductor; the first end of the first resistor is connected with an external power supply 6 and the first end of the first inductor, and the second end of the first resistor is connected with the first end of the gas discharge tube; the second end of the gas discharge tube is connected with the second end of the first diode and the ground wire; the second end of the first inductor is connected to the first end of the first diode, and the common end of the first inductor and the first diode serves as the output end of the surge protection circuit 100. FIG. 6 is a circuit diagram of a circuit protection in a multifunctional shipborne terminal with surge protection and remote online upgrade provided by another embodiment of the present application; as shown in fig. 6, the first resistor is R1 in the figure, correspondingly, the first inductor is L1 in the figure, the gas discharge tube is G1 in the figure, and the first diode is D1. The surge protection circuit 100 adopts a two-stage protection scheme, the first-stage protection scheme is R1 and G1 in the figure, a piezoresistor series ceramic Gas Discharge Tube (GDT) is adopted to absorb larger surge, the second stage adopts a Transient Voltage Suppressor (TVS) to further absorb the larger surge as D1 in the figure, the first inductor L1 is used as a decoupling device, inductors with matched power can be selected according to the current in the surge protection circuit 100, and two-stage circuits are mutually matched, so that the device of the ship-borne terminal can be better protected from being damaged by Voltage.

The voltage dependent resistor is a resistor with nonlinear volt-ampere characteristics, the resistance of the voltage dependent resistor changes with the change of voltage within a certain voltage range, and when the voltage in the surge protection circuit 100 is too large, the voltage dependent resistor performs voltage clamping to absorb redundant current so as to protect the circuit and other electronic devices in the circuit. However, the voltage dependent resistor absorbs large current in the circuit for a long time, so that the performance attenuation and aging of the voltage dependent resistor are easily caused, and the voltage dependent resistor has large parasitic capacitance, so that when the voltage dependent resistor is applied to the protection of an alternating current power supply system, excessive leakage current is often generated in a normal operation state, and the normal operation of the system is influenced due to the excessive leakage current, so that problems occur. In order to solve the problem, the piezoresistor and the gas discharge tube are connected in series, the gas discharge tube plays a role of a switch, the piezoresistor and the system can be separated under the normal work of the system, almost no leakage current flows in the piezoresistor, the voltage flowing through the piezoresistor is reduced, the leakage current cannot be increased, the aging phenomenon caused by the leakage current flowing through the piezoresistor for a long time is effectively slowed down, in addition, the piezoresistor and the gas discharge tube are connected in series for use, the output residual voltage can be reduced, the through-current capacity is improved, the service working time is prolonged, and the like.

The second stage in the surge protection circuit 100 adopts a transient suppressor TVS and a decoupling device, the TVS is a high-efficiency protection device, when two ends of the TVS are impacted by instantaneous high energy, the TVS can instantaneously convert self high-resistance characteristics into low-resistance characteristics, and absorb large current to clamp voltages at two ends of the TVS at a determined value, so that a rear circuit is prevented from being impacted by the instantaneous high energy, the circuit is protected from being safe, and the decoupling device can select an inductor with matched power according to the current of a line at the moment. Therefore, the surge protection circuit is provided with two stages of protection circuits which can be matched with each other to achieve a better protection effect.

It should be noted that the specific structure of the surge protection circuit 100 provided between the external power source 101 and the voltage converter 102 is not limited in this embodiment, and only needs to be satisfied that the surge protection circuit 100 can reduce the surge voltage and discharge the excessive surge current, and the surge protection circuit 100 provided with the varistor, the gas discharge tube, the transient suppression diode, and the first inductor is merely a preferred embodiment in this embodiment.

The utility model provides a but possess anti-surge, long-range online upgrade multi-functional shipborne terminal, this shipborne terminal includes: the device comprises an MCU1, an RNSS module 15, an RDSS module, a serial communication unit, a voltage converter 102 and a surge protection circuit 100; the input end of the surge protection circuit 100 is connected to an external power supply 101, and the output end of the surge protection circuit 100 is connected to a voltage converter 102, and is configured to reduce the surge voltage to a preset range and discharge a surge current when the surge voltage is generated. Surge protection circuit 100 can produce under the condition of surge voltage at thunderstorm weather, reduce surge voltage to the within range that does not harm the circuit to can release surge current, avoid the terminal to receive voltage too big and lead to the terminal to damage, promote the security at terminal, guarantee that shipborne terminal also can continuation work under adverse circumstances, reduce the cost of maintenance in later stage.

The above embodiment describes the surge protection circuit for lightning stroke resistance in detail, but has few choices for the ship-borne terminal power supply, and has a strict requirement on the input power supply range, and no overvoltage and undervoltage protection measures. On the basis of above-mentioned embodiment, as a preferred embodiment, the utility model provides a but possess anti-surge, long-range online upgrading multi-functional shipborne terminal still includes: and a protection circuit. As shown in fig. 5, a multi-level DC-DC voltage converter 102 is used for voltage reduction and a protection circuit is added in the previous stage.

The input end of the protection circuit is connected to the output end of the surge protection circuit 100, and the output end of the protection circuit is connected to the voltage converter 102, and is configured to disconnect the protection circuit when the electrical signal in the protection circuit does not meet the preset requirement. The terminal can be protected by the protection circuit so that the range of the input voltage is within a preset range.

As a possible implementation, the protection circuit includes: an anti-reverse connection circuit; an anti-reverse connection circuit is added at an input power supply to serve as a protection circuit, the input end of the anti-reverse connection circuit is connected with the output end of the surge protection circuit 100, and the output end of the anti-reverse connection circuit is connected with the voltage converter 102 and used for disconnecting the anti-reverse connection circuit when the positive pole and the negative pole of the external power supply 101 are connected with the anti-reverse connection circuit in an error mode, so that the shipborne terminal cannot be damaged due to the fact that the positive pole and the negative pole of the external power supply are connected reversely.

Since the protection circuit is added to the embodiment only on the basis of the above embodiment, and is used to disconnect the protection circuit when the electrical signal in the loop does not meet the preset requirement, the shipborne terminal is not affected, and the embodiment still has the working state of the shipborne terminal in the above embodiment, which is not described herein again.

It should be noted that the protection circuit in this embodiment includes an anti-reverse connection circuit only as a preferred embodiment, and in specific implementation, the specific structure of the protection circuit is not limited, and only the protection circuit needs to be automatically turned off when the positive electrode and the negative electrode of the power supply are connected incorrectly.

The above embodiment describes in detail the protection circuit and the reverse connection prevention circuit in the protection circuit, and on the basis of the above embodiment, as a preferred embodiment, the protection circuit further includes: overvoltage undervoltage protection circuit.

The input end of the overvoltage and undervoltage protection circuit is connected with the output end of the anti-reverse-connection circuit, and the output end of the overvoltage and undervoltage protection circuit is connected with the voltage converter 102 and used for disconnecting the overvoltage and undervoltage protection circuit under the condition that the overvoltage and undervoltage protection circuit is overvoltage or undervoltage.

In specific implementation, a protection circuit is arranged for protecting the shipborne terminal, and the protection circuit comprises an overvoltage and undervoltage protection circuit besides an anti-reverse connection circuit. The utility model provides an increased under-voltage overvoltage protection in the on-board terminal, be less than 9V and be higher than 36V when power supply unit, the terminal can protect automatically. The ship-borne terminal is greatly protected under the daily use condition by combining the reverse connection preventing circuit and the overvoltage and undervoltage protection circuit, the safety of the terminal is improved, and the damage rate of the terminal is reduced.

Since the overvoltage and undervoltage protection circuit is added on the basis of the above embodiment, when the overvoltage and undervoltage protection circuit is overvoltage or undervoltage, the overvoltage and undervoltage protection circuit is turned off, and the on-board terminal is not affected, the present embodiment still has the working state of the on-board terminal in the above embodiment, and details are not repeated here.

It should be noted that the protection circuit in this embodiment includes the overvoltage/undervoltage circuit only as a preferred embodiment, and in specific implementation, the specific structure of the overvoltage/undervoltage circuit is not limited, and it is only required to turn off the circuit when the input voltage is too large or too small.

In the above embodiment, an anti-reverse connection circuit is disposed between the surge protection circuit 100 and the voltage converter 102, and the protection terminal is described in detail, on the basis of the above embodiment, as a preferred embodiment, the anti-reverse connection circuit includes: the first PMOS tube, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the ninth resistor, the second diode, the third diode, the fourth diode, the fifth diode, the first triode, the second triode and the first capacitor; as shown in fig. 6, the first PMOS transistor is Q1 in fig. 6, and correspondingly, the second resistor is R2, the third resistor is R3, the fourth resistor is R4, the fifth resistor is R5, the sixth resistor is R6, the seventh resistor is R7, the eighth resistor is R8, the ninth resistor is R9, the second diode is D2, the third diode is D3, the fourth diode is D4, the fifth diode is D5, the first triode is T1, the second triode is T2, and the first capacitor is C1.

As shown in fig. 6, the anti-reverse connection circuit is specifically connected as follows:

the drain electrode of the first PMOS tube Q1 is used as the input end of an anti-reverse connection circuit and is connected with the anode of the second diode D2, the grid electrode of the first PMOS tube Q1 is connected with the first end of the second resistor R2 and the second end of the third resistor R3, and the source electrode of the first PMOS tube Q1 is connected with the cathode of the second diode D2, the first end of the third resistor R3, the first end of the fourth resistor R4, the first end of the fifth resistor R5, the emitter electrode of the first triode T1, the cathode of the fifth diode D5 and the first end of the ninth resistor R9; the common end of the first PMOS tube Q1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the first triode T1, the fifth diode D5 and the ninth resistor R9 is used as the output end of the reverse-connection preventing circuit;

the second end of the second resistor R2 is grounded; a second end of the fourth resistor R4 is connected to the cathode of the third diode D3; the anode of the third diode D3 is connected to the first end of the first capacitor C1, the first end of the seventh resistor R7 and the base of the second triode T2; the second end of the first capacitor C1 is connected with the second end of the seventh resistor R7, the emitting electrode of the second triode T2 and the ground wire; a second end of the fifth resistor R5 is connected to a first end of the sixth resistor R6 and a cathode of the fourth diode D4; the anode of the fourth diode D4 is grounded; the second end of the sixth resistor R6 is connected with the base electrode of the first triode T1; a collector of the first triode T1 is connected to an anode of the fifth diode D5, a second end of the ninth resistor R9, and a first end of the eighth resistor R8; a second end of the eighth resistor R8 is connected to the collector of the second transistor T2.

In specific implementation, when the power supply voltage is correctly connected, the power supply voltage firstly passes through the first PMOS tube, and due to the parasitic second diode D2 in the first PMOS tube, the Vgs voltage of the first PMOS tube is subtracted by the voltage drop voltage of the parasitic second diode D2 to be 0.7V, the absolute value of the voltage is greater than the conduction voltage of the first PMOS tube, and the first PMOS tube can be conducted. When the positive electrode and the negative electrode of the power voltage are reversely connected, the voltage of Vgs is larger than 0, the first PMOS tube cannot be conducted, and the second diode D2 parasitic in the first PMOS tube is also reversely cut off according to the unidirectional conductivity of the diodes, so that the current cannot form a loop, and the load is protected.

In this embodiment, a structure of an anti-reverse connection circuit is described, in which a first PMOS transistor Q1 is disposed in the anti-reverse connection circuit, so that when Vgs in the PMOS transistor reaches a conduction voltage, the PMOS transistor can be turned on, and when the positive and negative poles of a power supply are connected in a reverse direction, the anti-reverse connection circuit is turned off to protect other devices in the shipborne terminal.

The above embodiment describes in detail the specific structure and function of the anti-reverse connection circuit, and on the basis of the above embodiment, as a preferred embodiment, the overvoltage and undervoltage protection circuit includes: the second PMOS tube, a sixth diode, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor. As shown in fig. 6, the second PMOS transistor is Q2 in fig. 6, and correspondingly, the sixth diode is D6, the second capacitor is C2, the third capacitor is C3, the fourth capacitor is C4, and the fifth capacitor is C5.

As shown in fig. 6, the anti-reverse connection circuit is connected in the following specific manner:

a source electrode of the second PMOS transistor Q2 is connected to a source electrode of the first PMOS transistor, a cathode of the sixth diode D6, a first end of the third resistor R3, a first end of the fourth resistor R4, a first end of the fifth resistor R5, an emitter of the first triode T1, a cathode of the fifth diode D5, and a first end of the ninth resistor R5, a gate electrode of the second PMOS transistor Q2 is connected to a second end of the ninth resistor R9, a first end of the eighth resistor R8, an anode of the fifth diode D5, and a collector of the first triode T1, a drain electrode of the second PMOS transistor Q2 is connected to an anode of the sixth diode D6, a first end of the second capacitor C2, a first end of the third capacitor C3, a first end of the fourth capacitor C4, and a first end of the fifth capacitor C5;

the common end of the second PMOS tube Q2, a sixth diode D6, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a fifth capacitor C5 is used as the output end of the overvoltage and undervoltage protection circuit; the second end of the second capacitor C2 is connected to the second end of the third capacitor C3, the second end of the fourth capacitor C4, the second end of the fifth capacitor C5 and the ground line.

In specific implementation, due to the conduction of the sixth diode D6, vgs of the gate voltage of the second PMOS transistor Q2 is smaller than 0, the second PMOS transistor Q2 can be conducted, and the voltage can be normally output. When the voltage input by the external power supply is lower than 9V, the sixth diode D6 is not conducted, vgs is not smaller than 0, and the second PMOS tube Q2 is disconnected; when the voltage input by the external power supply is higher than 36V, the ship-borne terminal is protected by the voltage stabilizing tube of the PMOS tube at the front end, vgs is larger than 0, and at the moment, the second PMOS tube Q2 is also in a disconnected state until the overvoltage and undervoltage protection of the ship-borne terminal is completed.

In this embodiment, a structure of the reverse connection preventing circuit is described, in which a second PMOS transistor Q2 is disposed between the reverse connection preventing circuit and the voltage converting region, so that when Vgs in the PMOS transistor reaches a conducting voltage, the PMOS transistor can be conducted, and when a voltage provided by an external power supply is too large or too small, the circuit is disconnected to prevent a shipborne terminal from being damaged by a large voltage.

Above-mentioned embodiment has made detailed description to the anti-reverse connection circuit and the excessive pressure undervoltage protection circuit in surge protection circuit 100 and the protection circuit respectively, makes the utility model provides a shipborne terminal can resist the surge and protect shipborne terminal. On the basis of the above-mentioned embodiment, as a preferred embodiment, the utility model provides a shipborne terminal still includes: 4G module 11, bluetooth module 14.

The currently used shipborne equipment needs to be upgraded by using an independent serial port, the shipborne equipment does not have a remote upgrading function, and if the shipborne equipment needs to update a program, the shipborne equipment needs to be returned to a factory for upgrading. As a possible implementation, the utility model provides a shipborne terminal has increased 4G module 11 and bluetooth module 14 to the problem that equipment upgraded, can accomplish long-range upgrading through 4G module 11, and through bluetooth module 14's connection, can accomplish the upgrading at shipborne terminal through APP. Fig. 7 is a structural diagram of a multifunctional shipborne terminal with surge protection and remote online upgrade according to another embodiment of the present invention; as shown in fig. 7, one end of the 4G module 11 is connected to one end of the MCU1 through a UART interface, and the other end of the 4G module 11 is connected to the voltage converter 102 for remotely updating the onboard terminal; one end of the bluetooth module 14 is connected to one end of the MCU1 through the UART interface, and the other end of the bluetooth module 14 is connected to the voltage converter 102 for updating the onboard terminal.

In the embodiment, by adding the 4G module 11 and the Bluetooth module 14, the Bluetooth information or the 4G information can be received under the condition that the shipborne terminal normally works, real-time online upgrade is realized, the equipment does not need to be returned to a factory when the upgrade is needed, and in the subsequent release of a new version, an operator can upgrade the shipborne terminal at the background, so that the manual upgrade operation of the user is reduced, and convenience is brought to the user.

The above embodiment is directed to the problem of upgrading the onboard equipment, the 4G module 11 and the bluetooth module 14 are added for remotely updating the onboard equipment, and a detailed description is made herein, on the basis of the above embodiment, as a preferred embodiment, fig. 8 is a structural diagram of a multifunctional onboard terminal host with surge prevention and remote online upgrading functions provided by another embodiment of the present invention; as shown in fig. 7 and fig. 8, the utility model provides a shipborne terminal still includes: acceleration sensor 18, temperature sensor 22, watchdog 16.

In the embodiment, the monitoring function of the shipborne terminal is realized by arranging the acceleration sensor 18 and the temperature sensor 22, wherein one end of the acceleration sensor 18 is connected with the voltage converter 102, and the other end of the acceleration sensor 18 is connected with the MCU1 and is used for receiving the attitude information of the shipborne terminal; one end of the temperature sensor 22 is connected to the voltage converter 102, and the other end of the temperature sensor 22 is connected to the MCU1 for collecting temperature signals. The MCU1 circularly receives the information provided by the acceleration sensor 18 and judges whether the attitude of the shipborne terminal is normal or not, the MCU1 also acquires signals through the temperature sensor 22 to judge whether the temperature of the shipborne terminal is normal or not, and the state of the shipborne terminal is monitored in real time through judging the attitude information and the temperature information of the shipborne terminal.

In addition, the shipborne terminal provided by the embodiment is additionally provided with a watchdog 16, and the watchdog 16 is connected with the MCU1 and used for preventing the program from running away to cause the shipborne terminal to crash.

In the embodiment, the MCU1 is used for judging signals acquired by the added acceleration sensor 18 and the temperature sensor 22, so that the purpose of monitoring the state of the shipborne equipment in real time is achieved, and a watchdog 16 and an MCU1 real-time dog feeder are added in the shipborne terminal to prevent the shipborne terminal from crashing.

The above embodiment describes in detail the acceleration sensor 18, the temperature sensor 22 and the watchdog 16 added to the shipborne terminal, so as to implement the real-time monitoring function of the shipborne terminal. On the basis of the above embodiment, as a preferred embodiment, the multifunctional shipborne terminal with surge protection and capable of remote online upgrade provided by this embodiment further includes: and a FLASH storage module.

The FLASH storage module is connected with the MCU1 and is used for storing data information when no external power supply 101 is accessed, and loss of key information is avoided when power is off. As shown in fig. 8, the MCU1 is externally connected with the FLASH17, the MCU1 can read and write the FLASH17, and the key information can be saved in case of power failure.

In addition, the serial port interface communication of present shipborne equipment is more single, can not adapt to other all kinds of communication interfaces, to the serial ports problem, serial ports compatible 232, 485 and 422 communication have richened the diversification of interface, support multiple communication mode, can satisfy common interface on the market.

As shown in fig. 7, in this embodiment, the BDS20 and the GPS19 are connected to the MCU1, and the BDS20 and the GPS19 together form the RNSS module 15, so that the shipborne terminal supports a BDS B1/GPS L1 dual-mode operation, and an accurate positioning result is ensured.

It is right above the utility model provides a but possess prevent the surge, the multi-functional shipborne terminal of long-range online upgrade has carried out detailed introduction. The embodiments are described in a progressive mode in the specification, the emphasis of each embodiment is on the difference from the other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

It should also be noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. The utility model provides an possess prevent the surge, can long-range online upgrade multi-functional shipborne terminal which characterized in that, possess prevent the surge, can long-range online upgrade multi-functional shipborne terminal includes: the device comprises an MCU, an RNSS module, an RDSS module, a serial port communication unit, a voltage converter and a surge protection circuit;

the input end of the surge protection circuit is connected with an external power supply, and the output end of the surge protection circuit is connected with the voltage converter and used for reducing the surge voltage to a preset range and releasing surge current when the surge voltage is generated.

2. The shipborne terminal with surge protection and remote online upgrade functions as claimed in claim 1, further comprising: a protection circuit;

the input end of the protection circuit is connected with the output end of the surge protection circuit, and the output end of the protection circuit is connected with the voltage converter and used for disconnecting the protection circuit when the electric signal in the protection circuit does not meet the preset requirement.

3. The on-board ship terminal with surge protection and remote online upgrading functions as claimed in claim 2, wherein the protection circuit comprises: an anti-reverse connection circuit;

the input end of the reverse connection preventing circuit is connected with the output end of the surge protection circuit, and the output end of the reverse connection preventing circuit is connected with the voltage converter and used for disconnecting the reverse connection preventing circuit when the positive pole and the negative pole of the external power supply are connected into the reverse connection preventing circuit in a wrong mode.

4. The shipborne terminal with surge protection and remote online upgrade functions as claimed in claim 3, wherein the protection circuit further comprises: an overvoltage and undervoltage protection circuit;

the input end of the overvoltage and undervoltage protection circuit is connected with the output end of the reverse connection preventing circuit, and the output end of the overvoltage and undervoltage protection circuit is connected with the voltage converter and used for disconnecting the overvoltage and undervoltage protection circuit under the condition that the overvoltage and undervoltage protection circuit is overvoltage or undervoltage.

5. The shipborne terminal with surge protection and remote online upgrade functions as claimed in any one of claims 1 to 4, wherein the surge protection circuit comprises: the gas discharge lamp comprises a first resistor, a gas discharge tube, a first diode and a first inductor;

the first end of the first resistor is connected with the external power supply and the first end of the first inductor, and the second end of the first resistor is connected with the first end of the gas discharge tube;

the second end of the gas discharge tube is connected with the second end of the first diode and the ground wire;

the second end of the first inductor is connected with the first end of the first diode, and the common end of the first inductor and the first diode serves as the output end of the surge protection circuit.

6. The on-board ship terminal with surge protection and remote online upgrading functions as claimed in claim 4, wherein the reverse connection protection circuit comprises: the first PMOS tube, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the ninth resistor, the second diode, the third diode, the fourth diode, the fifth diode, the first triode, the second triode and the first capacitor;

the drain electrode of the first PMOS tube is used as the input end of the reverse-connection preventing circuit and is connected with the anode of the second diode, the grid electrode of the first PMOS tube is connected with the first end of the second resistor and the second end of the third resistor, and the source electrode of the first PMOS tube is connected with the cathode of the second diode, the first end of the third resistor, the first end of the fourth resistor, the first end of the fifth resistor, the emitter of the first triode, the cathode of the fifth diode and the first end of the ninth resistor;

the common end of the first PMOS tube, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the first triode, the fifth diode and the ninth resistor is used as the output end of the reverse connection preventing circuit;

the second end of the second resistor is grounded;

a second end of the fourth resistor is connected with a cathode of the third diode;

the anode of the third diode is connected with the first end of the first capacitor, the first end of the seventh resistor and the base electrode of the second triode;

the second end of the first capacitor is connected with the second end of the seventh resistor, the emitter of the second triode and the ground wire;

a second end of the fifth resistor is connected with a first end of the sixth resistor and a cathode of the fourth diode;

the anode of the fourth diode is grounded;

the second end of the sixth resistor is connected with the base electrode of the first triode;

a collector of the first triode is connected with an anode of the fifth diode, a second end of the ninth resistor and a first end of the eighth resistor;

and the second end of the eighth resistor is connected with the collector of the second triode.

7. The on-board ship terminal with surge protection and remote online upgrading functions as claimed in claim 6, wherein the overvoltage and undervoltage protection circuit comprises: the second PMOS tube, a sixth diode, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor;

a source electrode of the second PMOS transistor is connected to a source electrode of the first PMOS transistor, a cathode of the sixth diode, a first end of the third resistor, a first end of the fourth resistor, a first end of the fifth resistor, an emitter of the first triode, a cathode of the fifth diode, and a first end of the ninth resistor, a gate electrode of the second PMOS transistor is connected to a second end of the ninth resistor, a first end of the eighth resistor, an anode of the fifth diode, and a collector of the first triode, and a drain electrode of the second PMOS transistor is connected to an anode of the sixth diode, a first end of the second capacitor, a first end of the third capacitor, a first end of the fourth capacitor, and a first end of the fifth capacitor;

the common end of the second PMOS tube, the sixth diode, the second capacitor, the third capacitor, the fourth capacitor and the fifth capacitor is used as the output end of the overvoltage and undervoltage protection circuit;

and the second end of the second capacitor is connected with the second end of the third capacitor, the second end of the fourth capacitor, the second end of the fifth capacitor and the ground wire.

8. The shipborne terminal with surge protection and remote online upgrade functions as claimed in claim 7, further comprising: the 4G module and the Bluetooth module;

one end of the 4G module is connected with one end of the MCU through a UART interface, and the other end of the 4G module is connected with the voltage converter and used for remotely updating the shipborne terminal;

one end of the Bluetooth module is connected with one end of the MCU through a UART interface, and the other end of the Bluetooth module is connected with the voltage converter and used for updating the shipborne terminal.

9. The shipborne terminal with surge protection and remote online upgrade functions as claimed in claim 8, further comprising: the device comprises an acceleration sensor, a temperature sensor and a watchdog module;

one end of the acceleration sensor is connected with the voltage converter, and the other end of the acceleration sensor is connected with the MCU and used for receiving the attitude information of the shipborne terminal;

one end of the temperature sensor is connected with the voltage converter, and the other end of the temperature sensor is connected with the MCU and used for collecting temperature signals;

the watchdog module is connected with the MCU and used for preventing the program from running away to cause the shipborne terminal to crash.

10. The on-board terminal with surge protection and remote online upgrading functions as claimed in claim 9, further comprising: a FLASH storage module;

the FLASH storage module is connected with the MCU and is used for storing data information when the external power supply is not accessed.

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