CN111800278B - Network switcher - Google Patents
Network switcher Download PDFInfo
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- CN111800278B CN111800278B CN202010631628.7A CN202010631628A CN111800278B CN 111800278 B CN111800278 B CN 111800278B CN 202010631628 A CN202010631628 A CN 202010631628A CN 111800278 B CN111800278 B CN 111800278B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
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Abstract
The invention relates to a network switch, comprising: the intelligent control device comprises a reverser module, a relay, a network input end, a first network output end and a second network output end, wherein the input end of the reverser module is used for inputting a switching control signal, the first output end of the reverser module is connected with a power supply through a control coil of the relay, the network input end is connected with the first network output end and the second network output end through a contact of the relay, the reverser module has the function of reversing signals, the reliability of the switching control signal can be improved through the signal reversing function of the reverser module, the reliable switching of the relay is ensured, the contact of the relay acts under the function of the switching control signal, the network input end can be selectively connected with the first network output end and the second network output end, the reliable automatic switching of a network interface is realized, the intelligent degree is higher, and the increasingly high requirements of people on intelligent control are met.
Description
Technical Field
The present invention relates to a network switch.
Background
With the advancement of technology, networks are called as a virtual platform for information transmission, information reception and information sharing, and are one of the important tools for information communication of current people. In order to ensure the reliability of network communication, network switching is generally required by a network switch, however, the existing network switch is generally finished through manual operation, so that the intelligent control system is not intelligent enough, and cannot meet the increasing requirements of people on intelligent control.
Disclosure of Invention
The invention aims to provide a network switcher, which is used for solving the problem that the switching mode of the existing network switcher is low in intelligent degree.
In order to solve the problems, the invention adopts the following technical scheme:
a network switch, comprising: the switching control circuit comprises an inverter module, a relay, a network input end, a first network output end and a second network output end, wherein the input end of the inverter module is used for inputting a switching control signal, the first output end of the inverter module is connected with one end of a control coil of the relay, and the other end of the control coil of the relay is used for being connected with a power supply; the network input end is connected with the movable contact of the relay, the first fixed contact of the relay is connected with the first network output end, and the second fixed contact of the relay is connected with the second network output end.
Preferably, the network switcher further comprises a switching control signal input branch circuit, the switching control signal input branch circuit comprises a first PNP switching tube, a switching control signal input end, a first pull-up resistor and a first pull-down resistor, the control end of the first PNP switching tube is connected with the switching control signal input end, the switching control signal input end is used for inputting the switching control signal, the control end of the first PNP switching tube is connected with one end of the first pull-up resistor, and the other end of the first pull-up resistor is used for being connected with the power supply; the input end of the first PNP switch tube is used for being connected with the power supply, the output end of the first PNP switch tube is grounded through the first pull-down resistor, and the output end of the first PNP switch tube is connected with the input end of the inverter module.
Preferably, the switching control signal input branch further includes a first capacitor, a control end of the first PNP switching tube is connected to one end of the first capacitor, and the other end of the first capacitor is connected to the power supply.
Preferably, the network switcher further comprises a first indicator light control module and a second indicator light control module;
the first indicator light control module comprises a first indicator light control branch, one end of the first indicator light control branch is connected with the second output end of the reverser module, the other end of the first indicator light control branch is used for grounding, and a first indicator light is arranged on the first indicator light control branch in series;
the second indicator light control module comprises a second PNP switch tube and a second indicator light control branch, the control end of the second PNP switch tube is connected with the third output end of the reverser module, the control end of the second PNP switch tube is connected with one end of a second pull-up resistor, the other end of the second pull-up resistor is used for being connected with the power supply, the input end of the second PNP switch tube is used for being connected with the power supply, the output end of the second PNP switch tube is connected with one end of the second indicator light control branch, the other end of the second indicator light control branch is grounded, and a second indicator light is arranged on the second indicator light control branch in series.
Preferably, the inverter module is a composite transistor array ULN2003, the composite transistor array ULN2003 includes seven input pins and seven output pins, the seven input pins are input pin IN1, input pin IN2, input pin IN3, input pin IN4, input pin IN5, input pin IN6 and input pin IN7, the seven output pins are output pin OUT1, output pin OUT2, output pin OUT3, output pin OUT4, output pin OUT5, output pin OUT6 and output pin OUT7, the output end of the first PNP switch tube is connected with the input pin IN1, input pin IN2, input pin IN3, input pin IN4, input pin IN5, input pin IN6 and input pin IN7 of the composite transistor array ULN2003, the first output end of the inverter module includes output pin OUT1, output pin OUT2 and output pin OUT3, the second output end of the inverter module is output pin OUT6, and the third output end of the inverter module is output pin OUT7.
Preferably, the first indicator light control branch is further provided with a first current limiting resistor in series, and the second indicator light control branch is further provided with a second current limiting resistor in series.
Preferably, the network switcher further comprises a voltage stabilizing branch, one end of the voltage stabilizing branch is connected with the power supply, the other end of the voltage stabilizing branch is grounded, and a voltage stabilizer is arranged on the voltage stabilizing branch.
The beneficial effects of the invention are as follows: the switching control signal is input to the input end of the inverter module, the inverter module has the function of reversing the signal, namely if the switching control signal is in a low level, the output end of the inverter module outputs a high level signal, if the switching control signal is in a high level, the output end of the inverter module outputs a low level signal, the reliability of the switching control signal can be improved to a certain extent through the signal reversing function of the inverter module, and the reliable switching of the relay is ensured; under the action of the switching control signal, the movable contact of the relay can be selectively communicated with the first fixed contact or the second fixed contact, so that reliable switching of the network interface is realized. Therefore, the network switcher can realize automatic switching of the network interface according to the switching control signal, has higher intelligent degree, meets the higher and higher requirements of people on intelligent control, has a simpler and faster control mode, can realize network switching in a short time, and ensures stable communication. In addition, the switching control signal and the network signal are isolated through the relay, so that the physical complete isolation is realized, the network communication interference is not caused, the interference to other external equipment is not caused, and the normal connection between the network input end and a certain network output end can be realized even if the power supply is not connected.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the following briefly describes the drawings that are required to be used in the embodiments:
FIG. 1 is a schematic diagram of the overall structure of a network switch;
FIG. 2 is a circuit diagram of a switching control signal input branch, an inverter module, and a relay control coil;
FIG. 3 is a circuit diagram of a first indicator light control module;
FIG. 4 is a circuit diagram of a second indicator light control module;
FIG. 5 is a circuit diagram of a voltage stabilizing branch;
fig. 6 is a structural diagram of the network interface IN;
FIG. 7 is a block diagram of a relay contact;
fig. 8 is a structural diagram of the network interface a and the network interface B.
Detailed Description
As shown in fig. 1, the present embodiment provides a network switch, including: inverter module 101, relay, network input 104, first network output 105, and second network output 106. The relay comprises a control coil 102 and a contact module 103. The input end of the inverter module 101 is used for inputting a switching control signal, the first output end of the inverter module 101 is connected with one end of the control coil 102, and the other end of the control coil 102 is used for being connected with the power supply VCC. The network input 104 is connected to the movable contact of the contact module 103, the first stationary contact of the contact module 103 is connected to the first network output 105, and the second stationary contact of the contact module 103 is connected to the second network output 106. It should be understood that the voltage of the power supply VCC is set by actual needs.
The inverter module 101 has the function of inverting the signal, i.e. if the switching control signal is low, the output terminal of the inverter module 101 outputs a high signal, and if the switching control signal is high, the output terminal of the inverter module 101 outputs a low signal. As a specific embodiment, the inverter module 101 is a composite transistor array ULN2003, where the composite transistor array ULN2003 is a high voltage and high current composite transistor array, and is composed of seven silicon NPN composite transistors, each pair of darlington is connected in series with a base resistor of 2.7K, and can be directly connected to TTL and CMOS circuits at an operating voltage of 5V, so that data that originally needs to be processed by a standard logic buffer can be directly processed. As shown IN fig. 2, the composite transistor array ULN2003 (i.e., the composite transistor array IC 3) includes seven input pins, i.e., the input pin IN1, the input pin IN2, the input pin IN3, the input pin IN4, the input pin IN5, the input pin IN6, and the input pin IN7, and seven output pins, i.e., the output pin OUT1, the output pin OUT2, the output pin OUT3, the output pin OUT4, the output pin OUT5, the output pin OUT6, and the output pin OUT7, respectively. The other pins of the composite transistor array ULN2003 are not described in detail.
In this embodiment, the network switch further includes a switching control signal input branch, as shown in fig. 2, where the switching control signal input branch includes a first PNP switch tube (specifically, a PNP transistor Q1 in fig. 2), a switching control signal input end (a switching control signal input end IO in fig. 2), a first pull-up resistor (a resistor R3 in fig. 2), and a first pull-down resistor (a resistor R4 in fig. 2), a control end of the PNP transistor Q1 is connected to the switching control signal input end IO, the switching control signal input end IO is used for inputting a switching control signal, a control end of the PNP transistor Q1 is connected to one end of the resistor R3, and another end of the resistor R3 is connected to the power supply VCC. As a specific embodiment, the control terminal of the PNP transistor Q1 is connected to the switching control signal input terminal IO through the resistor R2, and the control terminal of the PNP transistor Q1 is further connected to the power supply VCC through the first capacitor (i.e., the capacitor C3). The input end of the PNP triode Q1 is connected with a power supply VCC, the output end of the PNP triode Q1 is grounded through a resistor R4, and the output end of the PNP triode Q1 is connected with the input end of the inverter module 101. Since the complex transistor array ULN2003 includes input pin IN1, input pin IN2, input pin IN3, input pin IN4, input pin IN5, input pin IN6, and input pin IN7, the output terminal of the PNP transistor Q1 is connected to input pin IN1, input pin IN2, input pin IN3, input pin IN4, input pin IN5, input pin IN6, and input pin IN7. IN addition, IN the present embodiment, resistors are disposed between the output end of the PNP transistor Q1 and the seven input pins, wherein a resistor R10 is disposed between the output end of the PNP transistor Q1 and the input pin IN1, the input pin IN2, the input pin IN3 and the input pin IN4, and a resistor R11 is disposed between the output end of the PNP transistor Q1 and the input pin IN5, the input pin IN6 and the input pin IN7, as shown IN fig. 2.
RL2C, RL C and RL3C in fig. 2 represent control coils of a relay, and then output pin OUT1, output pin OUT2 and output pin OUT3 of composite transistor array ULN2003 are respectively connected to one ends of control coil RL2C, control coil RL1C and control coil RL3C, and the other ends of control coil RL2C, control coil RL1C and control coil RL3C are connected to power supply VCC.
In this embodiment, the network switch further includes a first indicator light control module and a second indicator light control module. The first indicator light control module includes a first indicator light control branch, as shown in fig. 3, one end of the first indicator light control branch is connected to the second output end of the inverter module 101 (i.e. the output pin OUT6 of the composite transistor array ULN 2003), the other end of the first indicator light control branch is grounded, and a first indicator light (indicator light LED-a in fig. 3) is serially arranged on the first indicator light control branch. As a specific implementation manner, the first indicator light control branch can be further provided with a current limiting resistor R6 in series, so as to reduce the current on the first indicator light control branch and avoid burning out the indicator light LED-a due to high current.
As shown in fig. 4, the second indicator light control module includes a second PNP switching tube and a second indicator light control branch, where the second PNP switching tube is a PNP transistor Q2 in fig. 4. The control terminal of PNP transistor Q2 is connected to the third output terminal of inverter module 101 (i.e., output pin OUT7 of composite transistor array ULN 2003). The control end of the PNP triode Q2 is connected with one end of a second pull-up resistor (namely a resistor R7), and the other end of the resistor R7 is connected with a power supply VCC. As a specific embodiment, the control terminal of PNP transistor Q2 is connected to output pin OUT7 of composite transistor array ULN2003 through resistor R5. The input end of the PNP triode Q2 is connected with a power supply VCC, the output end of the PNP triode Q2 is connected with one end of a second indicator lamp control branch, and the other end of the second indicator lamp control branch is grounded. A second indicator light (indicator light LED-B in fig. 4) is arranged in series on the second indicator light control branch. In addition, as shown in fig. 4, the second indicator light control branch is further provided with a current limiting resistor R9 in series. As a specific embodiment, the output end of the PNP triode Q2 is further connected to one end of a shunt branch, the other end of the shunt branch is grounded, and the shunt branch is serially provided with a resistor R8.
In order to ensure the stability of the power supply VCC, the network switch further includes a voltage stabilizing branch, one end of the voltage stabilizing branch is connected to the power supply VCC, and the other end of the voltage stabilizing branch is grounded, as shown in fig. 5, where a voltage stabilizer CE1 is disposed on the voltage stabilizing branch, where the voltage stabilizer CE1 may be a voltage stabilizing capacitor or a voltage stabilizing tube.
It should be understood that the electrical parameters of the various components in the network switch are set by the actual situation.
The specific types of the network input 104, the first network output 105 and the second network output 106 are not limited, such as RS485 communication interface, RS232 communication interface, etc., and different types of network communication interfaces may have different numbers of pins and different functions. In this embodiment, the network input terminal 104, the first network output terminal 105 and the second network output terminal 106 each have a signal pin and a signal pin.
As shown IN fig. 6, the network input end 104 is a network interface IN, the signaling pin of the network interface IN is a signaling pin CT2P, the signal receiving pin is a signal receiving pin CT2N, the signal receiving pin CT2P corresponds to the signal receiving pin TDP, the signal receiving pin CT1P and the signal receiving pin TDN, and the signal receiving pin CT2N corresponds to the signal receiving pin RDP, the signal receiving pin CT1N and the signal receiving pin RDN.
Accordingly, in fig. 7, the contact modules RL1A and RL1B correspond to the control coil RL1C, the contact modules RL2A and RL2B correspond to the control coil RL2C, and the contact modules RL3A and RL3B correspond to the control coil RL3C.
In fig. 8, the first network output 105 is a network interface a, and the second network output 106 is a network interface B. The signaling pin of the network interface A is a signaling pin CT2AP, the signal receiving pin is a signal receiving pin CT2AN, the pins TDAP, CT1AP and TDAN correspond to the signal receiving pin CT2AP, and the pins RDAP, CT1AN and RDAN correspond to the signal receiving pin CT2 AN. The signaling pin of the network interface B is a signaling pin CT2BP, the signal receiving pin is a signal receiving pin CT2BN, the pins TDBP, CT1BP and TDBN correspond to the signaling pin CT2BP, and the pins RDBP, CT1BN and RDBN correspond to the signal receiving pin CT2 BN.
The connection relationship among the network interface IN, the network interface a, and the network interface B is shown IN fig. 7. It should be understood that the connection manner of other pins IN the network interface IN, the network interface a and the network interface B belongs to the conventional technology, and will not be described again.
When the switching control signal is at a high level, the control end of the PNP triode Q1 is a high level signal, the PNP triode Q1 is disconnected, the input pin of the composite transistor array ULN2003 inputs a low level signal, and since the composite transistor array ULN2003 has a signal reversing function, the output pin of the composite transistor array ULN2003 outputs a high level signal, no current is flowing IN the control coil RL1C, the control coil RL2C and the control coil RL3C, and the control coil RL1C, the control coil RL2C and the control coil RL3C are all switched to the contact corresponding to the network interface a, that is, the network interface IN is communicated with the network interface a, meanwhile, the first indicator lamp control branch is provided with current, the indicator lamp LED-a is lighted, the PNP triode Q2 is disconnected due to the fact that the control end is the high level signal, the branch where the indicator lamp LED-B is located is not provided with current, and the indicator lamp LED-B is not lighted.
When the switching control signal is at a low level, the control end of the PNP triode Q1 is a low level signal, the PNP triode Q1 is turned on, the input pin of the composite transistor array ULN2003 inputs a high level signal, and since the composite transistor array ULN2003 has a signal inversion function, the output pin of the composite transistor array ULN2003 outputs a low level signal, currents are IN the control coil RL1C, the control coil RL2C and the control coil RL3C, the control coil RL1C, the control coil RL2C and the control coil RL3C are all switched to the contacts corresponding to the network interface B, that is, the network interface IN is communicated with the network interface B, meanwhile, no current is IN the control branch of the first indicator lamp, the indicator lamp LED-a is not lighted, the PNP triode Q2 is turned on due to the fact that the control end is the low level signal, the current is IN the branch where the indicator lamp LED-B is located, and the indicator lamp LED-B is lighted.
The above description of the technical solution of the network switch protected by the present application in connection with a specific circuit structure should be understood that the present application is not limited to the specific circuit structure given above, and equivalent substitutions for circuit structures are all within the protection scope of the present application.
Claims (6)
1. A network switch, comprising: the switching control circuit comprises an inverter module, a relay, a network input end, a first network output end and a second network output end, wherein the input end of the inverter module is used for inputting a switching control signal, the first output end of the inverter module is connected with one end of a control coil of the relay, and the other end of the control coil of the relay is used for being connected with a power supply; the network input end is connected with the movable contact of the relay, the first fixed contact of the relay is connected with the first network output end, and the second fixed contact of the relay is connected with the second network output end;
the network switcher further comprises a switching control signal input branch circuit, wherein the switching control signal input branch circuit comprises a first PNP switching tube, a switching control signal input end, a first pull-up resistor and a first pull-down resistor, the control end of the first PNP switching tube is connected with the switching control signal input end, the switching control signal input end is used for inputting the switching control signal, the control end of the first PNP switching tube is connected with one end of the first pull-up resistor, and the other end of the first pull-up resistor is used for being connected with the power supply; the input end of the first PNP switch tube is used for being connected with the power supply, the output end of the first PNP switch tube is grounded through the first pull-down resistor, and the output end of the first PNP switch tube is connected with the input end of the inverter module.
2. The network switch of claim 1, wherein the switching control signal input branch further comprises a first capacitor, a control terminal of the first PNP switch tube is connected to one terminal of the first capacitor, and the other terminal of the first capacitor is connected to the power supply.
3. The network switch of claim 1 or 2, further comprising a first indicator light control module and a second indicator light control module;
the first indicator light control module comprises a first indicator light control branch, one end of the first indicator light control branch is connected with the second output end of the reverser module, the other end of the first indicator light control branch is used for grounding, and a first indicator light is arranged on the first indicator light control branch in series;
the second indicator light control module comprises a second PNP switch tube and a second indicator light control branch, the control end of the second PNP switch tube is connected with the third output end of the reverser module, the control end of the second PNP switch tube is connected with one end of a second pull-up resistor, the other end of the second pull-up resistor is used for being connected with the power supply, the input end of the second PNP switch tube is used for being connected with the power supply, the output end of the second PNP switch tube is connected with one end of the second indicator light control branch, the other end of the second indicator light control branch is grounded, and a second indicator light is arranged on the second indicator light control branch in series.
4. The network switch of claim 3, wherein the inverter module is a complex transistor array ULN2003, the complex transistor array ULN2003 includes seven input pins IN1, IN2, IN3, IN4, IN5, IN6, and IN7, the seven output pins are output pin OUT1, output pin OUT2, output pin OUT3, output pin OUT4, output pin OUT5, output pin OUT6, and output pin OUT7, respectively, the output terminal of the first PNP switch is connected to the input pin IN1, input pin IN2, input pin IN3, input pin IN4, input pin IN5, input pin IN6, and input pin IN7 of the complex transistor array ULN2003, the first output terminal of the inverter module includes output pin OUT1, output pin OUT2, and output pin OUT3, the second output terminal of the inverter module is output pin OUT6, and the third output terminal of the inverter module is output pin 7.
5. A network switch as claimed in claim 3, wherein the first pilot control branch is further provided with a first current limiting resistor in series, and the second pilot control branch is further provided with a second current limiting resistor in series.
6. The network switch of claim 1, further comprising a voltage stabilizing branch, wherein one end of the voltage stabilizing branch is connected to the power supply, the other end of the voltage stabilizing branch is grounded, and a voltage stabilizer is disposed on the voltage stabilizing branch.
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| CN202010631628.7A CN111800278B (en) | 2020-07-03 | 2020-07-03 | Network switcher |
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| CN202010631628.7A CN111800278B (en) | 2020-07-03 | 2020-07-03 | Network switcher |
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| CN111800278B true CN111800278B (en) | 2023-04-25 |
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