CN210112052U

CN210112052U - Fire wall

Info

Publication number: CN210112052U
Application number: CN201921448699.2U
Authority: CN
Inventors: 盖聪
Original assignee: Hainan Yueying Technology Co Ltd
Current assignee: Hainan Yueying Technology Co Ltd
Priority date: 2019-09-02
Filing date: 2019-09-02
Publication date: 2020-02-21
Anticipated expiration: 2029-09-02

Abstract

The utility model discloses a firewall, which comprises a microprocessor, a memory, a Flash, a network port, an electric port, an optical port, a RS422 interface, a network logic isolation module, a dynamic port detection module, an alarm module, a state detection module and a power module, wherein the microprocessor is respectively connected with the memory, the Flash, the network port, the electric port, the optical port, the RS422 interface, the network logic isolation module, the dynamic port detection module, the alarm module, the state detection module and the power module; the power module comprises a rectifier bridge, a first capacitor, a first resistor, a fourth resistor, a first triode, a second resistor, a third resistor, a relay, a photoelectric conversion device, a first diode, a battery, a second diode and a voltage output end, wherein one input end of the rectifier bridge is connected with one end of 220V alternating current, and the other input end of the rectifier bridge is connected with the other end of the 220V alternating current. The utility model discloses the security and the reliability of circuit are higher.

Description

Fire wall

Technical Field

The utility model relates to a communication equipment field, in particular to prevent hot wall.

Background

The firewall is a protection barrier which is formed by combining software and hardware equipment and is constructed on the interfaces between an internal network and an external network and between a private network and a public network, is an image saying for a method for obtaining security, is a combination of computer hardware and software, and ensures that a security gateway is established between Internet and Intranet so as to protect the internal network from being invaded by illegal users, and mainly comprises 4 parts of service access rules, verification tools, packet filtering and application gateways, and is software or hardware positioned between a computer and a network connected with the firewall. All network traffic and data packets flowing into and out of the computer pass through the firewall. The power supply part of the conventional firewall lacks the corresponding circuit protection function, for example: the safety and reliability of the circuit are poor due to the lack of the current-limiting protection function.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to prior art's above-mentioned defect, provide the security of a circuit and the higher hot wall that prevents of reliability.

The utility model provides a technical scheme that its technical problem adopted is: the firewall comprises a microprocessor, a memory, a Flash interface, a network port, an electric port, an optical port, an RS422 interface, a network logic isolation module, a dynamic port detection module, an alarm module, a state detection module and a power supply module, wherein the microprocessor is respectively connected with the memory, the Flash interface, the network port, the electric port, the optical port, the RS422 interface, the network logic isolation module, the dynamic port detection module, the alarm module, the state detection module and the power supply module;

the power module comprises a rectifier bridge, a first capacitor, a first resistor, a fourth resistor, a first triode, a second resistor, a third resistor, a relay, a photoelectric conversion device, a first diode, a battery, a second diode and a voltage output end, wherein one input end of the rectifier bridge is connected with one end of 220V alternating current, the other input end of the rectifier bridge is connected with the other end of the 220V alternating current, one output end of the rectifier bridge is respectively connected with one end of the first capacitor, one end of the first resistor and a collector electrode of the first triode, the other end of the first resistor is respectively connected with one end of the fourth resistor, a base electrode of the first triode and a collector electrode of the second triode, an emitter electrode of the first triode is respectively connected with one end of the second resistor and one end of a first contact of the relay, and the other end of the second resistor is respectively connected with a base electrode of the second triode and one end of the third resistor, one end of the photoelectric converter is connected with the anode of the first diode, the cathode of the first diode is respectively connected with one end of a second contact of the relay, the cathode of the second diode, the other end of the first contact of the relay and one end of the voltage output end, the other end of the second contact of the relay is connected with the anode of the battery, the anode of the second diode is connected with one end of a coil of the relay, the other output end of the rectifier bridge is respectively connected with the other end of the first capacitor, the other end of the fourth resistor, the emitter of the second triode, the other end of the third resistor, the other end of the photoelectric converter, the cathode of the battery, the other end of the coil of the relay and the other end of the voltage output end, and the resistance value of the fourth resistor is 30k omega.

In the fire-proof wall of the present invention, the power module further comprises a third diode, an anode of the third diode is connected to one end of the 220V alternating current, a cathode of the third diode is connected to an input terminal of the rectifier bridge, and a model of the third diode is S-352T.

Prevent in the hot wall, power module still includes fifth resistance, the one end of fifth resistance with the negative pole of first diode is connected, the other end of fifth resistance respectively with the other end of the first contact of relay and voltage output end's one end are connected, the resistance of fifth resistance is 52k omega.

In the fire-proof wall of the present invention, the first triode is an NPN-type triode.

In the fire-proof wall of the present invention, the second triode is an NPN-type triode.

Implement the utility model discloses a prevent hot wall has following beneficial effect: the intelligent monitoring system is provided with a microprocessor, a memory, a Flash, a network port, an electric port, an optical port, an RS422 interface, a network logic isolation module, a dynamic port detection module, an alarm module, a state detection module and a power supply module; the power module comprises a rectifier bridge, a first capacitor, a first resistor, a fourth resistor, a first triode, a second resistor, a third resistor, a relay, a photoelectric conversion device, a first diode, a battery, a second diode and a voltage output end, and the fourth resistor is used for current-limiting protection, so that the safety and the reliability of the circuit are high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of the firewall according to the present invention;

fig. 2 is a schematic circuit diagram of the power supply module in the embodiment.

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 embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the embodiment of the firewall of the present invention, the schematic structural diagram of the firewall is shown in fig. 1. In fig. 1, the firewall includes a microprocessor 1, a memory 2, a Flash3, a network port 4, an electrical port 5, an optical port 6, an RS422 interface 7, a network logic isolation module 8, a dynamic port detection module 9, an alarm module 10, a state detection module 11, and a power supply module 12, where the microprocessor 1 is connected to the memory 2, the Flash3, the network port 4, the electrical port 5, the optical port 6, the RS422 interface 7, the network logic isolation module 8, the dynamic port detection module 9, the alarm module 10, the state detection module 11, and the power supply module 12, respectively.

The network logic isolation module 8 is used for network logic isolation, and the alarm module 10 provides access and audit of access logs, event logs and alarm logs.

The firewall has a regional isolation function, can realize data communication monitoring, limits unauthorized data communication, and can be controlled in an initial occurrence region once a network fault occurs, so that the normal operation of other regions cannot be influenced. In the test mode, all network data can pass through, only data which do not accord with the communication rule are alarmed, and no operation risk is brought to the industrial control system; in the operation mode, the direct transparent access can be realized without changing the industrial control field network topological structure and the host configuration, and the equipment deployment and implementation are very convenient and fast.

The microprocessor 1, the memory 2, the Flash3, the network port 4, the electrical port 5, the optical port 6, the RS422 interface 7, the network logic isolation module 8, the dynamic port detection module 9, the alarm module 10 and the state detection module 11 are all implemented by adopting the structure in the prior art, the working principle of the system is also the working principle in the prior art, and the mastiff is not described in detail here.

Fig. 2 is a schematic circuit diagram of a power module in this embodiment, in fig. 2, the power module 12 includes a rectifier bridge Z, a first capacitor C1, a first resistor R1, a fourth resistor R4, a first transistor Q1, a second transistor Q2, a second resistor R2, a third resistor R3, a relay, a photoelectric conversion device P, a first diode D1, a battery BAT, a second diode D2, and a voltage output Vo, wherein one input end of the rectifier bridge Z is connected to one end of 220V ac power, the other input end of the rectifier bridge Z is connected to the other end of the 220V ac power, one output end of the rectifier bridge Z is connected to one end of a first capacitor C1, one end of a first resistor R1, and a collector of a first transistor Q1, the other end of the first resistor R1 is connected to one end of a fourth resistor R4, a base of the first transistor Q1, and a collector of a second transistor Q2, an emitter of the first resistor Q1 is connected to a contact point of the second resistor R2 and a contact point of the relay 1-a contact point of the second transistor Q2, respectively The other end of the second resistor R2 is respectively connected with the base of the second triode Q2 and one end of the third resistor R3, one end of the photoelectric converter P is connected with the anode of the first diode D1, the cathode of the first diode D1 is respectively connected with one end of the second contact J-2 of the relay, the cathode of the second diode D2, the other end of the first contact J-1 of the relay and one end of the voltage output end Vo, the other end of the second contact J-2 of the relay is connected with the anode of the battery BAT, the anode of the second diode D2 is connected with one end of the coil J of the relay, the other output end of the rectifier bridge Z is respectively connected with the other end of the first capacitor C1, the other end of the fourth resistor R4, the emitter of the second triode Q2, the other end of the third resistor R3, the other end of the photoelectric converter P, the cathode of the battery BAT, the other end of the coil J of the relay, and the other end of the voltage output end Vo.

The fourth resistor R4 is a current limiting resistor for current limiting protection. The current limiting protection principle is as follows: when the current of the branch where the fourth resistor R4 is located is large, the current of the branch where the fourth resistor R4 is located can be reduced by the fourth resistor R4, so that the branch is kept in a normal operating state, and the components in the circuit are not burned out due to too large current, so that the safety and reliability of the circuit are high. It should be noted that, in the present embodiment, the resistance of the fourth resistor R4 is 30k Ω. Of course, in practical applications, the resistance of the fourth resistor R4 may be adjusted accordingly, that is, the resistance of the fourth resistor R4 may be increased or decreased accordingly.

The working principle of the power module 12 is as follows: under the condition of sufficient illumination in the daytime, the photoelectric conversion device P completes photoelectric conversion, electric energy is transmitted out through the first diode D1, so that the relay is electrified, the first contact J-1 of the relay is attracted, the second contact J-2 of the relay is disconnected, the battery BAT is charged and is simultaneously supplied to the microprocessor 1 for use, if the voltage of the battery BAT is insufficient in rainy days for a long time, the output voltage of the battery BAT is insufficient to break through the second diode D2, so that the relay is disconnected, the second contact J-2 of the relay is attracted, the 220V mains supply voltage enters the rectifier bridge Z for rectification, the direct current voltage output from one output end of the rectifier bridge Z enters a voltage protection circuit consisting of the first resistor R1, the second resistor R2, the first triode Q1 and the second triode Q2, the voltage divided by the first resistor R1 and the fourth resistor R4 under normal conditions is conducted by the first triode Q1, the power is supplied to the microprocessor 1 through the second contact J-2 of the relay, when under-voltage condition occurs, the voltage divided by the first resistor R1 and the fourth resistor R4 is not enough to enable the first triode Q1 to be conducted, the microprocessor 1 is protected from under-voltage damage, the second resistor R2, the third resistor R3 and the second triode Q2 form an over-voltage protection circuit, when the output voltage is higher than the set value, the voltage divided by the first resistor R1 and the second resistor R2 enables the second triode Q2 to be conducted, and therefore the purpose of over-voltage protection is achieved.

In this embodiment, the first transistor Q1 is an NPN transistor. The second transistor Q2 is an NPN transistor. Of course, in practical applications, the first transistor Q1 and the second transistor Q2 are both PNP transistors, but the circuit structure is changed accordingly.

In this embodiment, the power module 12 further includes a third diode D3, an anode of the third diode D3 is connected to one end of the 220V ac power, and a cathode of the third diode D3 is connected to one input end of the rectifier bridge Z. The third diode D3 is a current limiting diode for current limiting protection. The current limiting protection principle is as follows: when the current of the branch where the third diode D3 is located is large, the current of the branch where the third diode D3 is located can be reduced by the third diode D3, so that the branch can be kept in a normal operating state, and the components in the circuit cannot be burned out due to the large current, so as to further enhance the safety and reliability of the circuit. It should be noted that in the present embodiment, the third diode D3 has a model number of S-352T. Of course, in practical applications, the third diode D3 may also be another type of diode with similar functions.

In this embodiment, the power module 12 further includes a fifth resistor R5, one end of the fifth resistor R5 is connected to the cathode of the first diode D1, and the other end of the fifth resistor R5 is connected to the other end of the first contact J-1 of the relay and one end of the voltage output Vo, respectively. The fifth resistor R5 is a current limiting resistor for current limiting protection. The current limiting protection principle is as follows: when the current of the branch where the fifth resistor R5 is located is large, the current of the branch where the fifth resistor R5 is located can be reduced by the fifth resistor R5, so that the branch can be kept in a normal operating state, and the component in the circuit can not be burned out due to the large current, so that the safety and reliability of the circuit can be further enhanced. It should be noted that, in the present embodiment, the resistance of the fifth resistor R5 is 52k Ω. Of course, in practical applications, the resistance of the fifth resistor R5 may be adjusted according to specific situations, that is, the resistance of the fifth resistor R5 may be increased or decreased according to specific situations.

In short, in this embodiment, since the current-limiting diode is provided in the power module 12, the safety and reliability of the circuit are high.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A firewall is characterized by comprising a microprocessor, a memory, a Flash, a network port, an electric port, an optical port, an RS422 interface, a network logic isolation module, a dynamic port detection module, an alarm module, a state detection module and a power module, wherein the microprocessor is respectively connected with the memory, the Flash, the network port, the electric port, the optical port, the RS422 interface, the network logic isolation module, the dynamic port detection module, the alarm module, the state detection module and the power module;

2. The fire protection wall of claim 1, wherein the power module further comprises a third diode, an anode of the third diode is connected to one end of the 220V alternating current, a cathode of the third diode is connected to one input end of the rectifier bridge, and the third diode is S-352T in type.

3. The fire protection wall according to claim 2, wherein the power supply module further comprises a fifth resistor, one end of the fifth resistor is connected to the cathode of the first diode, the other end of the fifth resistor is connected to the other end of the first contact of the relay and one end of the voltage output terminal, respectively, and the resistance of the fifth resistor is 52k Ω.

4. The firewall according to any one of claims 1 to 3, wherein the first transistor is an NPN transistor.

5. The firewall according to any one of claims 1 to 3, wherein the second transistor is an NPN transistor.