CN219394413U - Communication link protection circuit and communication link - Google Patents
Communication link protection circuit and communication link Download PDFInfo
- Publication number
- CN219394413U CN219394413U CN202320311307.8U CN202320311307U CN219394413U CN 219394413 U CN219394413 U CN 219394413U CN 202320311307 U CN202320311307 U CN 202320311307U CN 219394413 U CN219394413 U CN 219394413U
- Authority
- CN
- China
- Prior art keywords
- communication link
- switching tube
- control end
- voltage
- switching device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The utility model relates to the field of communication links, and discloses a communication link protection circuit and a communication link, wherein the communication link protection circuit comprises: a switching device and a second switching tube; the first end of the switching device is connected with the communication link control end, the second end of the switching device is connected with the input end of the second switching tube, and when the voltage of the communication link control end is detected to be higher than the voltage threshold value, the switching device is conducted; the first end of the second switching tube is connected with the control end of the first switching tube of the ending circuit, and the second end of the second switching tube is grounded so as to switch off the first switching tube when the switching device is switched on. According to the method, the switching device is arranged at the control end of the communication link, when the voltage of the control end of the communication link is higher than the threshold value, the second switching tube is controlled to pull down the voltage of the control end of the first switching tube, so that the loop where the control end of the communication link is located is turned off, the loop where the control end is located and other devices in the communication link are prevented from being damaged due to overhigh voltage, and the stability and reliability of the communication link are improved.
Description
Technical Field
The present utility model relates to the field of communication links, and in particular, to a communication link protection circuit and a communication link.
Background
The first-line communication technology (N-ISDN) is developed based on telephone line, and can provide comprehensive services of voice, data, image, etc. on a common telephone line, so as to provide economical, high-speed, multifunctional, wide-coverage and simple-access communication means for society. Currently, the first-line communication technology is widely applied to the fields of automobiles and the like (for example, an electric vehicle battery management system (Battery Management System, BMS)).
Fig. 1 is a schematic diagram of a first-line communication link provided in an embodiment of the present application, as shown in fig. 1, a battery pack is connected to an electric vehicle controller through the first-line communication link to obtain a control signal. Fig. 2 is a circuit diagram of a line communication link according to an embodiment of the present application, as shown in fig. 2, where the link includes: the wake-up circuit and the end circuit, wherein, the output end (ONELINE RX MCU) of the wake-up link and the input end (ONELINE TX MCU) of the end circuit are connected with the controller, and the electric vehicle controller can be controlled to communicate with the battery management system in the battery pack through a line communication link by adjusting the voltage signal of the control end.
Because of the high voltage signal in the electric vehicle system, in the process of line assembly or test, the connecting terminal is connected incorrectly due to misoperation of workers or the connecting terminal quality is unqualified, so that the control end of the first-line communication link is short-circuited with the high voltage terminal. Meanwhile, under normal conditions, the control end can also have high and low level change, so that the communication link can not respond in time, and finally the communication link is damaged.
It can be seen how to provide a communication link protection circuit to prevent a short circuit between a wire communication link and a high voltage terminal from causing damage to the communication link, thereby improving the stability and reliability of the communication link.
Disclosure of Invention
The utility model aims to provide a communication link protection circuit which is used for preventing a communication link from being damaged due to the short circuit between a first-line communication link and a high-voltage terminal, so that the stability and the reliability of the communication link are improved.
In order to solve the above technical problem, the present application provides a communication link protection circuit applied to a wire communication link including a wake-up circuit and an end circuit, the protection circuit including:
a switching device and a second switching tube;
the first end of the switching device is connected with the control end of the communication link, the second end of the switching device is connected with the input end of the second switching tube, and when the voltage of the control end of the communication link is detected to be higher than a voltage threshold value, the switching device is conducted;
the first end of the second switching tube is connected with the control end of the first switching tube of the ending circuit, and the second end of the second switching tube is grounded so as to pull down the voltage of the control end of the first switching tube when the switching device is turned on, so that the first switching tube is turned off.
Preferably, the switching device is a zener diode.
Preferably, the communication link protection circuit further includes: a first resistor and a second resistor;
the first end of the first resistor is connected with the second end of the zener diode;
the second end of the first resistor and the first end of the second resistor are connected with the control end of the second switch tube.
Preferably, the method further comprises: the alarm circuit is connected with the controller and works when receiving an alarm signal sent by the controller; wherein the controller is a controller connected with the communication link.
Preferably, the alarm circuit comprises a buzzer and an indicator light.
Preferably, the switching device includes at least 2 zener diodes.
Preferably, the first switching tube and the second switching tube are triodes.
In order to solve the technical problem, the application also provides a communication link, which comprises the communication link protection circuit.
Preferably, the control end of the communication link is an anti-reverse plug.
The application provides a communication link protection circuit, is applied to a communication link including wake-up circuit and end circuit, and protection circuit includes: a switching device and a second switching tube; the first end of the switching device is connected with the communication link control end, the second end of the switching device is connected with the input end of the second switching tube, and when the voltage of the communication link control end is detected to be higher than the voltage threshold value, the switching device is conducted; the first end of the second switching tube is connected with the control end of the first switching tube of the ending circuit, and the second end of the second switching tube is grounded so as to pull down the voltage of the control end of the first switching tube when the switching device is turned on, so that the first switching tube is turned off. Therefore, according to the technical scheme provided by the application, the switching device is arranged at the control end of the communication link, when the voltage of the control end of the communication link is higher than the threshold value, the second switching tube is controlled to pull down the voltage of the control end of the first switching tube, so that the loop where the control end of the communication link is located is turned off, the loop where the control end is located and other devices in the communication link are prevented from being damaged due to overhigh voltage, and the stability and reliability of the communication link are improved.
In addition, the application also provides a communication link, comprising the communication link protection link, and the effects are the same as those of the communication link protection link.
Drawings
For a clearer description of embodiments of the present utility model, the drawings that are required to be used in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
Fig. 1 is a schematic diagram of a first-line communication link according to an embodiment of the present application;
FIG. 2 is a circuit diagram of a first-line communication link according to an embodiment of the present application;
fig. 3 is a block diagram of a communication link protection circuit according to an embodiment of the present application;
the reference numerals are as follows: 1 is a wake-up circuit, 2 is an end circuit, and 3 is a switching device.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by a person of ordinary skill in the art without making any inventive effort are within the scope of the present utility model.
The core of the utility model is to provide a communication link protection circuit to prevent the communication link from being damaged due to the short circuit between a first-line communication link and a high-voltage terminal, thereby improving the stability and the reliability of the communication link.
In order to better understand the aspects of the present utility model, the present utility model will be described in further detail with reference to the accompanying drawings and detailed description.
Fig. 3 is a block diagram of a communication link protection circuit according to an embodiment of the present application, and as shown in fig. 3, the protection circuit is applied to a line communication link including a wake-up circuit 1 and an end circuit 2, and includes: a switching device 3 and a second switching tube Q2; the first end of the switching device 3 is connected with the control end of the communication link, the second end of the switching device 3 is connected with the input end of the second switching tube Q2, and when the voltage of the control end is detected to be higher than a voltage threshold value, the switching device 3 is turned on;
the first end of the second switching tube Q2 is connected to the control end of the first switching tube Q1 of the ending circuit 2, and the second end of the second switching tube Q2 is grounded to pull the voltage of the control end of the first switching tube Q1 low when the switching device 3 is turned on, so that the first switching tube Q1 is turned off.
As shown in fig. 3, in the working process of the first-line communication link, when the communication link control end (COM end) is connected with the 5V power signal or the 12V power signal, the fourth switching tube Q4 and the third switching tube Q3 are both turned on, the output end ONELINE RX MCU port of the wake-up circuit 1 becomes high level, and the singlechip connected with the wake-up circuit 1 receives the wake-up signal, and at this time, the singlechip starts to send first-line protocol data. When the singlechip or other upper computers send a one-wire communication termination instruction, the input end ONELINE TX MCU port of the ending circuit 2 becomes high level, at this time, the fifth switching tube Q5 is turned on, the first switching tube Q1 is turned on, the control end (COM end) of the communication link is pulled down to low level, and the singlechip stops one-wire communication.
However, when the control terminal (COM terminal) of the communication link is connected to the high voltage signal, the communication link may not respond in time due to the high-low level change of the control terminal under normal conditions, which eventually leads to the communication link being damaged. Therefore, the communication link protection circuit provided in the present embodiment detects the voltage value at the communication link control terminal through the switching device 3. If the voltage value of the COM terminal is higher than the threshold value, the switching device 3 is turned on, the voltage of the control terminal of the second switching tube Q2 is raised, the second switching tube Q2 is turned on, the control terminal of the first switching tube Q1 is grounded, and the first switching tube Q1 is turned off, at this time, the voltage of the COM terminal cannot be pulled down, and the COM terminal can only output a high level, so that communication according to a one-wire communication protocol cannot be performed. Enabling the user to discover circuit faults as soon as possible.
It can be understood that the signals and the circuit results of the switching device 3 and the second switching tube Q2 are not limited in this embodiment, and only the task of pulling the voltage of the control terminal of the first switching tube Q1 down when the voltage of the COM terminal is higher than the threshold value needs to be completed.
The application provides a communication link protection circuit, is applied to a communication link including wake-up circuit and end circuit, and protection circuit includes: a switching device and a second switching tube; the first end of the switching device is connected with the communication link control end, the second end of the switching device is connected with the input end of the second switching tube, and when the voltage of the communication link control end is detected to be higher than the voltage threshold value, the switching device is conducted; the first end of the second switching tube is connected with the control end of the first switching tube of the ending circuit, and the second end of the second switching tube is grounded so as to pull down the voltage of the control end of the first switching tube when the switching device is turned on, so that the first switching tube is turned off. Therefore, according to the technical scheme provided by the application, the switching device is arranged at the control end of the communication link, when the voltage of the control end of the communication link is higher than the threshold value, the second switching tube is controlled to pull down the voltage of the control end of the first switching tube, so that the loop where the control end of the communication link is located is turned off, the loop where the control end is located and other devices in the communication link are prevented from being damaged due to overhigh voltage, and the stability and reliability of the communication link are improved.
As a preferred embodiment, a zener diode is used as the switching device 3 in order to reduce the circuit cost. The zener diode is also known as a zener diode. The diode with voltage stabilizing function is manufactured by utilizing the phenomenon that PN of the diode is in a junction reverse breakdown state, the current of the diode can be changed in a large range, and the voltage of the diode is basically unchanged. The diode is a semiconductor device having a very high resistance up to a critical reverse breakdown voltage. At this critical breakdown point, the reverse resistance decreases to a small value, in which the current increases while the voltage remains constant, and the zener diode is stepped according to the breakdown voltage, because of this characteristic, the zener diode is mainly used as a voltage regulator or voltage reference element. The zener diodes may be connected in series for use at higher voltages, with higher regulated voltages being obtained by the series connection.
In a specific implementation, a corresponding zener diode is selected as the switching device 3 according to the rated voltage value of the COM terminal, and when the voltage value of the COM terminal is greater than the breakdown voltage of the zener diode, the zener diode is broken down, and the second switching tube Q2 starts to operate, so as to play a role in protecting the communication link.
Further, the switching device 3 may be a single zener diode or a combination of a plurality of zener diodes. According to the maximum voltage value which can be borne by the COM terminal, the purpose of protecting the communication link can be achieved by changing the number of the voltage stabilizing diodes in the access circuit.
As a preferred embodiment, the second switching tube Q2 includes: the first resistor R1, the second resistor R2 and the second switching tube Q2; the first end of the first resistor R1 is connected with the second end of the zener diode; the second end of the first resistor R1 and the first end of the second resistor R2 are connected with the control end of the second switching tube Q2; the first end of the second switching tube Q2 is connected with the ending circuit 2, and the second end of the second switching tube Q2 and the second end of the second resistor R2 are grounded.
When the voltage value of the COM end is higher than the threshold value, the switching device 3 is turned on, the voltage of the control end of the second switching tube Q2 is raised, the second switching tube Q2 is turned on, the control end of the first switching tube Q1 is grounded, the first switching tube Q1 is turned off, at this time, the voltage of the COM end cannot be pulled down, and the COM end can only output a high-level signal. Further, the switching transistors mentioned in the present application are all triodes.
In order to enable a user to timely find out the fault condition of a first-line communication link, an alarm circuit can be added to the protection circuit, and the alarm circuit is connected with a controller, wherein the controller is a processor connected with the communication link;
when the voltage of the control end is not reduced in the first time threshold from the moment when the controller sends the communication ending signal, the controller controls the alarm circuit to work.
In an embodiment, when the controller sends the communication end signal, if the line communication link can work normally at this time, the voltage of the COM terminal is pulled down to a low level. Otherwise, the communication link protection circuit is in a working state, the voltage value of the COM port is larger than the rated voltage value, and the controller controls the alarm circuit to work so as to remind a user that the communication link has faults.
Further, the alarm circuit comprises a buzzer and an indicator lamp, and when the controller detects that the voltage of the control end is not reduced in the first time threshold, the indicator lamp is controlled to flash, and the buzzer is controlled to make sound.
In addition, the present application also provides a communication link, including: a switching device and a second switching tube; the first end of the switching device is connected with the communication link control end, the second end of the switching device is connected with the input end of the second switching tube, and when the voltage of the communication link control end is detected to be higher than the voltage threshold value, the switching device is conducted; the first end of the second switching tube is connected with the control end of the first switching tube of the ending circuit, and the second end of the second switching tube is grounded so as to pull down the voltage of the control end of the first switching tube when the switching device is turned on, so that the first switching tube is turned off. Therefore, according to the technical scheme provided by the application, the switching device is arranged at the control end of the communication link, when the voltage of the control end of the communication link is higher than the threshold value, the second switching tube is controlled to pull down the voltage of the control end of the first switching tube, so that the loop where the control end of the communication link is located is turned off, the loop where the control end is located and other devices in the communication link are prevented from being damaged due to overhigh voltage, and the stability and reliability of the communication link are improved. In a specific implementation, in order to further improve the safety and stability of the communication link, an anti-reverse plug may be further disposed at an interface between the control end and the external power supply.
The communication link protection circuit and the communication link provided by the utility model are described above in detail. In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following 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. Moreover, 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 phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (9)
1. A communication link protection circuit for a line communication link comprising a wake-up circuit (1) and an end circuit (2), the communication link protection circuit comprising:
a switching device (3) and a second switching tube;
the first end of the switching device (3) is connected with a communication link control end, the second end of the switching device (3) is connected with the control end of the second switching tube, and when the voltage of the communication link control end is detected to be higher than a voltage threshold value, the switching device (3) is turned on;
the first end of the second switching tube is connected with the control end of the first switching tube of the ending circuit (2), and the second end of the second switching tube is grounded so as to pull down the voltage of the control end of the first switching tube when the switching device (3) is turned on to turn off the first switching tube.
2. A communication link protection circuit according to claim 1, characterized in that the switching device (3) is a zener diode.
3. The communication link protection circuit of claim 2, wherein the communication link protection circuit further comprises: a first resistor and a second resistor;
the first end of the first resistor is connected with the second end of the zener diode;
the second end of the first resistor and the first end of the second resistor are connected with the control end of the second switch tube.
4. The communication link protection circuit of claim 1, further comprising: the alarm circuit is connected with the controller and works when receiving an alarm signal sent by the controller; wherein the controller is a controller connected with the communication link.
5. The communication link protection circuit of claim 4, wherein the alarm circuit comprises a buzzer and an indicator light.
6. A communication link protection circuit according to claim 2, characterized in that the switching device (3) comprises at least 2 zener diodes.
7. The communication link protection circuit of claim 1, wherein the first switching tube and the second switching tube are transistors.
8. A communication link comprising the communication link protection circuit of any one of claims 1 to 7.
9. The communication link of claim 8, wherein the control end of the communication link is a reverse plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320311307.8U CN219394413U (en) | 2023-02-24 | 2023-02-24 | Communication link protection circuit and communication link |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320311307.8U CN219394413U (en) | 2023-02-24 | 2023-02-24 | Communication link protection circuit and communication link |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219394413U true CN219394413U (en) | 2023-07-21 |
Family
ID=87195575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320311307.8U Active CN219394413U (en) | 2023-02-24 | 2023-02-24 | Communication link protection circuit and communication link |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219394413U (en) |
-
2023
- 2023-02-24 CN CN202320311307.8U patent/CN219394413U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105788556B (en) | A kind of overvoltage crowbar and method, liquid crystal display drive circuit | |
| US4661879A (en) | Overcurrent protection circuit for line circuits in a switching system | |
| CN111788752A (en) | Protection circuit, power supply system of hard disk device and vehicle-mounted device | |
| CN212751771U (en) | Protection circuit, power supply system of hard disk device and vehicle-mounted device | |
| CN215728409U (en) | Wide voltage input signal monitoring circuit with isolation filtering function | |
| CN111799759A (en) | Overcurrent protection circuit of vehicle-mounted ECU output power supply and control method thereof | |
| CN219394413U (en) | Communication link protection circuit and communication link | |
| CN109193834B (en) | Overvoltage protection device, method and system | |
| CN111628875B (en) | Ethernet power supply equipment port power supply state indicating circuit and power supply equipment | |
| CN214412262U (en) | Protection circuit, circuit board and protection system | |
| CN104660247A (en) | Two-way interface circuit | |
| CN209929946U (en) | Power supply protection circuit of Ethernet switch | |
| CN218549750U (en) | Wiegand interface protection circuit | |
| CN219843595U (en) | Isolated digital input detection circuit | |
| CN216697034U (en) | Input/output detection control system | |
| CN110518543A (en) | A kind of short-circuit protection circuit and power supply system | |
| CN221669545U (en) | Protection circuit for automobile central control | |
| CN217563310U (en) | Undervoltage protection circuit and power supply device | |
| CN221408436U (en) | Power supply reverse input protection circuit and power supply output circuit | |
| CN104160602A (en) | Method for remote control of a power converter module and a device therefor | |
| CN220935021U (en) | Mining power input overvoltage protection buffer circuit | |
| CN218068245U (en) | Power supply current detection circuit | |
| CN219918421U (en) | Electronic equipment | |
| CN212849825U (en) | Overvoltage and undervoltage protection circuit with automatic power-off of design voltage | |
| CN220190460U (en) | Interface protection circuit, interface protection device and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |