CN210016480U

CN210016480U - Network switch

Info

Publication number: CN210016480U
Application number: CN201920828978.5U
Authority: CN
Inventors: 姚虹伶; 姚婉玲
Original assignee: Guangzhou Xin Meng Da Mdt Infotech Ltd
Current assignee: Guangzhou Xin Meng Da Mdt Infotech Ltd
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2020-02-04
Anticipated expiration: 2029-05-31

Abstract

The utility model discloses a network switch, including physical layer network port, PD receive electric module, network switching module, singlechip and power module, the singlechip is connected with PD receive electric module, network switching module and power module respectively, physical layer network port is connected with PD receive electric module and network switching module respectively; the power module comprises a first capacitor, a direct-current power supply, a first diode, a first triode, a second capacitor, a second triode, a first resistor, a second resistor, a third triode, a third capacitor, a fourth resistor, a fifth resistor, a fourth triode, a second diode, a storage battery, a sixth resistor, a seventh resistor, an eighth resistor, a fifth triode and a voltage output end. The utility model discloses circuit structure is comparatively simple, the cost is lower, the security and the reliability of convenient maintenance, circuit are higher.

Description

Network switch

Technical Field

The utility model relates to a network communication equipment field, in particular to network switch.

Background

A network switch is a device that expands the network and provides more connection ports in a sub-network to connect more computers. With the development of the communication industry and the promotion of informatization of national economy, the network switch market is in a steady rising situation. The method has the characteristics of high cost performance, high flexibility, relative simplicity, easy realization and the like. Therefore, ethernet technology has become the most important lan networking technology today, and network switches have become the most popular switches. The power supply part of the traditional network switch uses more components, the circuit structure is complex, the hardware cost is high, and the maintenance is inconvenient. In addition, since the power supply portion of the conventional network switch lacks a corresponding circuit protection function, for example: the lack of a signal interference prevention function results in poor safety and reliability of the circuit.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a circuit structure is comparatively simple, the cost is lower, the security and the higher network switch of reliability of convenient maintenance, circuit are provided.

The utility model provides a technical scheme that its technical problem adopted is: the network switch is constructed and comprises a physical layer network port, a PD power receiving module, a network switching module, a single chip microcomputer and a power supply module, wherein the single chip microcomputer is respectively connected with the PD power receiving module, the network switching module and the power supply module;

the power supply module comprises a first capacitor, a direct current power supply, a first diode, a first triode, a second capacitor, a second triode, a first resistor, a second resistor, a third triode, a third capacitor, a fourth resistor, a fifth resistor, a fourth triode, a second diode, a storage battery, a sixth resistor, a seventh resistor, an eighth resistor, a fifth triode and a voltage output end, wherein one end of the first capacitor is respectively connected with the direct current power supply, the cathode of the first diode, one end of the third resistor, one end of the fourth resistor, one end of the seventh resistor, the anode of the second diode and one end of the sixth resistor, the anode of the first diode is respectively connected with the collector of the first triode and one end of the second capacitor, the other end of the second capacitor is respectively connected with the base of the second triode and one end of the first resistor, the base electrode of the first triode is connected with the collector electrode of the second triode, the emitting electrode of the second triode is respectively connected with one end of the second resistor, the other end of the third resistor, the base electrode of the third triode and the collector electrode of the fourth triode, the collector electrode of the third triode is connected with one end of the third capacitor, the other end of the third capacitor is respectively connected with the other end of the fourth resistor, one end of the fifth resistor and the base electrode of the fourth triode, the emitting electrode of the fourth triode is respectively connected with the other end of the fifth resistor, the cathode of the second diode and the anode of the storage battery, the other end of the seventh resistor is respectively connected with the base electrode of the fifth triode and one end of the eighth resistor, and the other end of the sixth resistor is respectively connected with the collector electrode of the fifth triode and one end of the voltage output end, the other end of the first capacitor is respectively connected with the emitting electrode of the first triode, the other end of the first resistor, the other end of the second resistor, the emitting electrode of the third triode, the negative electrode of the storage battery, the other end of the eighth resistor, the emitting electrode of the fifth triode and the other end of the voltage output end, and the capacitance value of the third capacitor is 180 pF.

Network switch in, power module still includes the fourth electric capacity, the one end of fourth electric capacity respectively with the projecting pole of second triode and the collecting electrode of fourth triode are connected, the other end of fourth electric capacity respectively with the one end of second resistance, the other end of third resistance and the base of third triode are connected, the capacitance value of fourth electric capacity is 240 pF.

In the network switch of the present invention, the power module further includes a third diode, an anode of the third diode is connected to the other end of the sixth resistor and one end of the voltage output terminal, a cathode of the third diode is connected to a collector of the fifth triode, and a model of the third diode is S-202T.

Network switch in, power module still includes the ninth resistance, the one end of ninth resistance with the projecting pole of second triode is connected, the other end of ninth resistance with the collecting electrode of fourth triode is connected, the resistance of ninth resistance is 28k omega.

Network switch in, first triode, third triode and fifth triode are NPN type triode, second triode and fourth triode are PNP type triode.

Implement the utility model discloses a network switch has following beneficial effect: the system is provided with a physical layer network port, a PD power receiving module, a network switching module, a singlechip and a power supply module; the power module comprises a first capacitor, a direct current power supply, a first diode, a first triode, a second capacitor, a second triode, a first resistor, a second resistor, a third triode, a third capacitor, a fourth resistor, a fifth resistor, a fourth triode, a second diode, a storage battery, a sixth resistor, a seventh resistor, an eighth resistor, a fifth triode and a voltage output end, the power module is compared with the power supply part of a traditional network switch, fewer components and parts are used, the hardware cost can be reduced, in addition, the third capacitor is used for preventing the interference between the third triode and the fourth triode, therefore, the circuit structure is simple, the cost is low, the maintenance is convenient, and 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 a network switch 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 network switch of the present invention, a schematic structural diagram of the network switch is shown in fig. 1. In fig. 1, the network switch includes a physical layer network port 1, a PD powered module 2, a network switching module 3, a single chip microcomputer 4, and a power module 5, where the single chip microcomputer 4 is connected to the PD powered module 2, the network switching module 3, and the power module 5, and the physical layer network port 1 is connected to the PD powered module 2 and the network switching module 3.

Specifically, the physical layer network port 1 is a standard RJ45 interface and is responsible for receiving and analyzing network data packets transmitted by a network cable, and transmitting the analyzed data to the network switching module 3, the network switching module 3 obtains key data in the analyzed data and transmits the key data to the single chip microcomputer 4 for calculation, the single chip microcomputer 4 returns a calculation result to the network switching module 3, and the network switching module 3 completes switching transmission of the network data packets according to the calculation result. The PD powered module 2 is a module in the existing PoE technology that receives power from PSE power supply equipment, and is controlled by the single chip 4 to transmit electric energy to the physical layer network port 1 to supply power to network cable connected terminal equipment.

Fig. 2 is a schematic circuit diagram of a power module in this embodiment, and in fig. 2, the power module 5 includes a first capacitor C1, a dc power VCC, a first diode D1, a first transistor Q1, a second capacitor C2, a second transistor Q2, a first resistor R1, a second resistor R2, a third resistor R3, a third transistor Q3, a third capacitor C3, a fourth resistor R4, a fifth resistor R5, a fourth transistor Q4, a second diode D2, a battery E, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a fifth transistor Q5, and a voltage output Vo.

Wherein, one end of the first capacitor C1 is connected to the dc power VCC, the cathode of the first diode D1, one end of the third resistor R3, one end of the fourth resistor R4, one end of the seventh resistor R7, the anode of the second diode D2 and one end of the sixth resistor R6, the anode of the first diode D1 is connected to the collector of the first transistor Q1 and one end of the second capacitor C2, the other end of the second capacitor C2 is connected to the base of the second transistor Q2 and one end of the first resistor R1, the base of the first transistor Q1 is connected to the collector of the second transistor Q2, the emitter of the second transistor Q2 is connected to one end of the second resistor R2, the other end of the third resistor R3, the base of the third transistor Q3 and the collector of the fourth transistor Q4, the collector of the third transistor Q3 is connected to one end of the third capacitor C56, the other end of the third capacitor C8269553 is connected to one end of the fourth resistor R4, One end of a fifth resistor R5 is connected to a base of the fourth triode Q4, an emitter of the fourth triode Q4 is connected to the other end of the fifth resistor R5, a cathode of the second diode D2 and an anode of the battery E, the other end of the seventh resistor R7 is connected to a base of the fifth triode Q5 and one end of the eighth resistor R8, the other end of the sixth resistor R6 is connected to a collector of the fifth triode Q5 and one end of the voltage output terminal Vo, the other end of the first capacitor C1 is connected to an emitter of the first triode Q1, the other end of the first resistor R1, the other end of the second resistor R2, an emitter of the third triode Q3, a cathode of the battery E, the other end of the eighth resistor R8, an emitter of the fifth triode Q5 and the other end of the voltage output terminal Vo.

This power module 5 compares with the power supply part of traditional network switch, has saved components and parts such as some resistances, inductance and diode, and the components and parts that use are less, can reduce the hardware cost like this, and in addition, third electric capacity C3 is coupling capacitance for prevent the interference between third triode Q3 and the fourth triode Q4, therefore the security and the reliability of circuit are higher. It should be noted that, in the present embodiment, the capacitance of the third capacitor C3 is 180 pF. Of course, in practical applications, the capacitance value of the third capacitor C3 may be adjusted accordingly, that is, the capacitance value of the third capacitor C3 may be increased or decreased accordingly.

The working principle of the power module 5 is as follows: charging the battery E. If the battery being charged is not fully charged. The voltage between the anode of the second diode D2 and the cathode of the battery E is also low due to the low terminal voltage, so that the voltage division on the loop of the seventh resistor R7 and the eighth resistor R8 is lower than the bias voltage of the fifth transistor Q5, so that the fifth transistor Q5 is turned off, and the power voltage is directly applied to the single chip microcomputer 4 through the sixth resistor R6 as the charging state indication.

In addition, the power supply supplies power to the emergency switching function circuit of the third triode Q3 and the fourth triode Q4 through the third resistor R3 and the fourth resistor R4, and the third resistor R3 makes the third triode Q3 biased to be on, but at this time, the electric potential value on the base electrode of the fourth triode Q4 is higher than the emitter electrode thereof, so that the fourth triode Q4 is also in an off state. Once the mains power is cut off, the third transistor Q3 is still turned on during the short period of discharging the original stored voltage of the first capacitor C1, so the charge of the rechargeable battery immediately turns on the emitter-collector of the fourth transistor Q4 due to the bias current generated by the emitter-base of the fourth transistor Q4, the collector-emitter loop of the third capacitor C3 and the collector-emitter loop of the third transistor Q3. Thus, the battery E immediately supplies power to the first transistor Q1-the second transistor Q2 through the emitter-collector of the fourth transistor Q4.

In this embodiment, the first transistor Q1, the third transistor Q3, and the fifth transistor Q5 are all NPN transistors, and the second transistor Q2 and the fourth transistor Q4 are all PNP transistors. Certainly, in practical applications, the first transistor Q1, the third transistor Q3, and the fifth transistor Q5 may also be PNP transistors, and the second transistor Q2 and the fourth transistor Q4 may also be NPN transistors, but the circuit structure may also be changed accordingly.

In this embodiment, the power module 5 further includes a fourth capacitor C4, one end of the fourth capacitor C4 is connected to the emitter of the second transistor Q2 and the collector of the fourth transistor Q4, respectively, and the other end of the fourth capacitor C4 is connected to one end of the second resistor R2, the other end of the third resistor R3, and the base of the third transistor Q3, respectively. The fourth capacitor C4 is a coupling capacitor for preventing interference between the second transistor Q2 and the third transistor Q3, so as to further enhance the safety and reliability of the circuit. It should be noted that, in the present embodiment, the capacitance of the fourth capacitor C4 is 240 pF. Of course, in practical applications, the capacitance value of the fourth capacitor C4 may be adjusted accordingly, that is, the capacitance value of the fourth capacitor C4 may be increased or decreased accordingly.

In this embodiment, the power module 5 further includes a third diode D3, an anode of the third diode D3 is connected to the other end of the sixth resistor R6 and one end of the voltage output terminal Vo, and a cathode of the third diode D3 is connected to a collector of the fifth triode Q5. The third diode D3 is a current-limiting diode, and is used for current-limiting protection of the collector current of the fifth transistor Q5, when the collector current of the fifth transistor Q5 is large, the collector current of the fifth transistor Q5 can be reduced by the third diode D3, so that the fifth transistor Q5 can be kept in a normal operating state, and the situation that components in the circuit are burnt out due to too large current is avoided, so that the safety and reliability of the circuit are further enhanced. It should be noted that in the present embodiment, the third diode D3 has a model number S-202T. 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 5 further includes a ninth resistor R9, one end of the ninth resistor R9 is connected to the emitter of the second transistor Q2, and the other end of the ninth resistor R9 is connected to the collector of the fourth transistor Q4. The ninth resistor R9 is a current limiting resistor for performing current limiting protection to further enhance the current limiting effect. It should be noted that, in the present embodiment, the resistance of the ninth resistor R9 is 28k Ω. Of course, in practical applications, the resistance of the ninth resistor R9 may be adjusted according to specific situations, that is, the resistance of the ninth resistor R9 may be increased or decreased according to specific situations.

In a word, in this embodiment, this power module 5 compares with the power supply part of traditional network switch, and its components and parts that use are less, and circuit structure is comparatively simple, and convenient maintenance can reduce the hardware cost like this, and in addition, is equipped with coupling capacitance in this power module 5, and therefore the security and the reliability of circuit are higher.

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 network switch is characterized by comprising a physical layer network port, a PD powered module, a network switching module, a single chip microcomputer and a power supply module, wherein the single chip microcomputer is respectively connected with the PD powered module, the network switching module and the power supply module;

2. The network switch of claim 1, wherein the power module further comprises a fourth capacitor, one end of the fourth capacitor is connected to the emitter of the second transistor and the collector of the fourth transistor, the other end of the fourth capacitor is connected to one end of the second resistor, the other end of the third resistor, and the base of the third transistor, and the capacitance of the fourth capacitor is 240 pF.

3. The network switch according to claim 2, wherein the power module further comprises a third diode, an anode of the third diode is connected to the other end of the sixth resistor and one end of the voltage output terminal, a cathode of the third diode is connected to a collector of the fifth triode, and the third diode is S-202T.

4. The network switch according to claim 3, wherein the power module further comprises a ninth resistor, one end of the ninth resistor is connected to the emitter of the second transistor, the other end of the ninth resistor is connected to the collector of the fourth transistor, and the resistance of the ninth resistor is 28k Ω.

5. The network switch of any of claims 1-4, wherein the first, third, and fifth transistors are NPN transistors, and the second and fourth transistors are PNP transistors.