CN219123927U - Protection circuit and CAN port - Google Patents
Protection circuit and CAN port Download PDFInfo
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- CN219123927U CN219123927U CN202222907787.2U CN202222907787U CN219123927U CN 219123927 U CN219123927 U CN 219123927U CN 202222907787 U CN202222907787 U CN 202222907787U CN 219123927 U CN219123927 U CN 219123927U
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Abstract
The application provides a protection circuit and a CAN port. The protection circuit is connected between the CAN signal bus and the CAN port circuit, and at least comprises a first protection circuit and a second protection circuit, wherein the input end of the first protection circuit is connected with the CAN signal bus, and the output end of the first protection circuit is grounded and used for absorbing static electricity and surge energy; the second protection circuit is connected in series between the connection point of the first protection circuit and the CAN signal bus and the CAN port circuit and is used for isolating surge energy. The protection circuit CAN reduce the probability of damaging the CAN port circuit by surge energy.
Description
Technical Field
The present disclosure relates to the field of communications systems, and in particular, to a protection circuit and a CAN port.
Background
The controller area network (Controller Area Network, CAN) communication technology belongs to a bus type serial communication network, adopts a differential type communication mode, has the characteristics of reliability, real-time, flexibility, good anti-interference performance and the like, and is widely applied to industries such as industrial control, new energy and the like.
However, the CAN signal has the conditions of frequent plugging, long-distance wiring and long-distance wiring parallel to the high-voltage signal, and at this time, the CAN port circuit is damaged by Electrical Overstress (EOS) energy, and if the protection is improper, the damage CAN be caused.
Disclosure of Invention
The utility model provides a protection circuit and CAN port CAN reduce the probability that CAN port circuit damaged.
In order to solve the technical problems, one technical scheme adopted by the application is as follows: providing a protection circuit connected between a CAN signal bus and a CAN port circuit, wherein the protection circuit at least comprises a first protection circuit and a second protection circuit, the input end of the first protection circuit is connected with the CAN signal bus, and the output end of the first protection circuit is grounded and used for absorbing static electricity and surge energy; the second protection circuit is connected in series between the connection point of the first protection circuit and the CAN signal bus and the CAN port circuit and is used for isolating surge energy.
In order to solve the technical problems, another technical scheme adopted by the application is as follows: a CAN port is provided that includes the protection circuit described above.
The beneficial effects of this application are: the protection circuit between access CAN signal bus and CAN port circuit that this application provided, through setting up first protection circuit and second protection circuit, and first protection circuit's input and CAN signal bus connection, its output ground connection, second protection circuit concatenates between the tie point of first protection circuit and CAN signal bus and CAN port circuit. Through the mode, when the surge energy caused by overhigh voltage or current passes through the first protection circuit, the first protection circuit CAN absorb most static electricity and the surge energy so as to reduce the static electricity and the surge energy, and when the surge energy attenuated by the first protection circuit passes through the second protection circuit, the second protection circuit CAN prevent the surge energy from directly being connected into the CAN port circuit in series, so that the surge energy entering the CAN port circuit is further reduced, and the probability that the residual surge energy damages the CAN port circuit is reduced.
Drawings
For a clearer description of the technical solutions in the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a schematic diagram of an embodiment of a protection circuit provided herein;
FIG. 2 is a schematic diagram of an embodiment of the first protection circuit in the embodiment of FIG. 1;
FIG. 3 is a schematic diagram of an embodiment of the first protection sub-circuit in the embodiment of FIG. 2;
FIG. 4 is a schematic diagram of another embodiment of the first guard sub-circuit in the embodiment of FIG. 2;
FIG. 5 is a schematic diagram of an embodiment of a second protection circuit in the embodiment of FIG. 1;
FIG. 6 is a schematic diagram of an embodiment of a second guard sub-circuit in the embodiment of FIG. 5;
FIG. 7 is a schematic diagram of another embodiment of the second guard sub-circuit in the embodiment of FIG. 5;
FIG. 8 is a schematic diagram of another embodiment of a protection circuit provided herein;
FIG. 9 is a schematic diagram of an embodiment of a third protection circuit in the embodiment of FIG. 8;
FIG. 10 is a schematic diagram of an embodiment of a third guard sub-circuit in the embodiment of FIG. 9;
FIG. 11 is a schematic diagram of a further embodiment of the protection circuit provided herein;
fig. 12 is a schematic structural diagram of an embodiment of a CAN port provided in the present application.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
It should be noted that, in the embodiment of the present application, directional indications (such as up, down, left, right, front, and rear … …) are referred to, and the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a protection circuit provided in the present application. As shown in fig. 1, the present application provides a protection circuit 100 connected between a CAN signal bus and a CAN port circuit 200, where the protection circuit 100 includes at least a first protection circuit 120 and a second protection circuit 110. The input end of the first protection circuit 120 is connected to the CAN signal bus, and the output end thereof is grounded for absorbing static electricity and surge energy. The second protection circuit 110 is connected in series between the connection point of the first protection circuit 120 and the CAN signal bus and the CAN port circuit 200, and is used for isolating surge energy. Wherein CAN port circuit 200 may include a CAN signal transceiver.
Electrical overstress is a common cause of damage to components and is manifested by a large amount of thermal energy generated by over-voltage or over-current, which causes the internal temperature of the component to be too high, thereby damaging the component. The voltage and current exceeding the stable values, namely surge energy, cause the internal temperature of the component to be too high, thereby damaging the component. When the protection circuit 100 works, when surge energy caused by overvoltage or overcurrent passes through the first protection circuit 120, the first protection circuit 120 CAN absorb most static electricity and the surge energy so as to reduce the static electricity and the surge energy, and when the surge energy attenuated by the first protection circuit 120 passes through the second protection circuit 110, the second protection circuit 110 CAN prevent the surge energy from directly being connected into the CAN port circuit 200 in series, so that the surge energy entering the CAN port circuit 200 is further reduced, and the probability that the residual surge energy damages the CAN port circuit 200 is reduced.
The protection circuit 100 connected between the CAN signal bus and the CAN port circuit 200 is provided with the first protection circuit 120 and the second protection circuit 110, the input end of the first protection circuit 120 is connected with the CAN signal bus, the output end of the first protection circuit is grounded, and the second protection circuit 110 is connected between the connection point of the first protection circuit 120 and the CAN signal bus and the CAN port circuit 200 in series. In this way, when the surge energy caused by the excessively high voltage or current passes through the first protection circuit 120, the first protection circuit 120 CAN absorb most of the static electricity and the surge energy, so as to reduce the static electricity and the surge energy, and when the surge energy attenuated by the first protection circuit 120 passes through the second protection circuit 110, the second protection circuit 110 CAN prevent the surge energy from directly being connected into the CAN port circuit 200, so that the surge energy entering the CAN port circuit 200 is further reduced, and the probability of damaging the CAN port circuit 200 by the residual surge energy is reduced.
Optionally, referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of the first protection circuit in the embodiment of fig. 1. The CAN signal bus includes a dominant line can_h and a recessive line can_l, as shown in fig. 2, the first protection circuit 120 includes at least two first protection sub-circuits 121, an input end of one first protection sub-circuit 121 is connected to the dominant line can_h in the CAN signal bus, an output end of the first protection sub-circuit is grounded, and the first protection sub-circuit 121 electrically connected to the dominant line can_h in the CAN signal bus CAN receive static and surge energy flowing through the dominant line can_h. The input end of the other first protection sub-circuit 121 is connected to the recessive line can_l in the CAN signal bus, and the output end thereof is grounded, so that the first protection sub-circuit 121 electrically connected to the recessive line can_l in the CAN signal bus CAN receive the static electricity and surge energy flowing through the recessive line can_l. The first protection circuit 120 may further include 4, 6, etc. first protection sub-circuits 121, and in the same connection manner as described above, the first protection sub-circuits with equal number are set on the dominant line can_h and the recessive line can_l in the CAN signal bus.
The first protection circuit 120 of this embodiment, through setting at least two first protection sub-circuits 121, is connected to the dominant line can_h in the CAN signal bus and the recessive line can_l in the CAN signal bus respectively, when the surge energy flows through the recessive line can_l or the dominant line can_h, or when the surge energy flows through the recessive line can_l and the dominant line can_h at the same time, the first protection sub-circuits 121 CAN absorb the static and the surge energy on any one or two signal lines, so as to reduce the surge energy entering the later protection circuit.
Optionally, the first protection subcircuit 121 includes a high power transient suppression diode (refer to fig. 3), a first end of which may be connected to the dominant line can_h, or a first end of which is connected to the recessive line can_l, and a second end of which is grounded. The high-power transient suppression diode is a diode type high-efficiency protection device, and can be used for protecting the high-power transient suppression diode at 10 ℃ when surge, static discharge and other voltages occur, namely when the two poles of the high-power transient suppression diode are impacted by reverse transient high energy -12 The second-order speed changes the high resistance between the two poles into low resistance, absorbs the surge energy of thousands of watts, clamps the voltage between the two poles at a preset value, effectively protects the precise components in the electronic circuit from being damaged by surge pulse, plays a role in high-power transient suppression of the diodeAnd (5) suppressing the state voltage.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of the first protection sub-circuit in the embodiment of fig. 2. As shown in fig. 3, the output of the first high power transient suppression diode 1211 is connected to a dominant line can_h in the CAN signal bus, the output of which is grounded. The output of the second high power transient suppression diode 1212 is connected to a recessive line can_l in the CAN signal bus, the output of which is grounded.
The first protection sub-circuit 121 of the embodiment CAN quickly absorb the surge energy by setting a high-power transient suppression diode, reduce the surge energy from entering the post-stage circuit, and reduce the damage of the CAN signal circuit.
Optionally, the first protection sub-circuit 121 may further include a semiconductor discharge tube (refer to fig. 4), where a first end of the semiconductor discharge tube is connected to a second end of the high power transient suppression diode, and a second end of the semiconductor discharge tube is grounded. When the surge voltage exceeds the turning voltage, the semiconductor discharge tube discharges, and the surge energy is directly discharged to the ground, and when the current of the semiconductor discharge tube is lower than the maintaining current, the semiconductor discharge tube ends the discharge.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of the first protection sub-circuit in the embodiment of fig. 2. As shown in fig. 4, a first end of the first semiconductor discharge tube 1221 is connected to a second end of the first high power transient suppression diode 1211, and a second end of the first semiconductor discharge tube 1221 is grounded; a first terminal of a second semiconductor discharge tube 1222 is connected to a second terminal of a second high power transient suppression diode 1212, the second terminal of the second semiconductor discharge tube 1222 being grounded.
The first protection sub-circuit 121 of the present embodiment is configured to absorb most of static electricity and surge energy that is strung in from the CAN signal bus by arranging a high-power transient suppression diode and a semiconductor discharge tube in series. The semiconductor discharge tube has small junction capacitance, strong surge energy absorption capability, high response speed and low residual voltage, and even if the follow current problem exists, the semiconductor discharge tube is combined with the high-power transient suppression diode, so that the influence of the follow current characteristic of the semiconductor discharge diode on circuit transmission CAN be prevented, the junction capacitance is reduced, the influence of CAN signal transmission is reduced, the low residual voltage characteristic is maintained, and the protection of a later-stage protection circuit is facilitated.
Alternatively, in other embodiments of the first protection sub-circuit 121, a semiconductor discharge tube or diode array (or rectifier bridge), and a high-power transient suppression diode or varistor may be included in combination. Or the first guard sub-circuit 121 may include a gas discharge tube.
Optionally, referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of the second protection circuit 110 in the embodiment of fig. 1. As shown in fig. 5, the second protection circuit 110 includes at least two second protection sub-circuits 111, wherein one second protection sub-circuit 111 is connected in series between the connection point of the first protection sub-circuit 121 and the dominant line can_h and the CAN port circuit 200 to isolate the surge energy on the dominant line can_h. The other second protection sub-circuit 111 is connected in series between the connection point of the first protection sub-circuit 121 and the recessive line can_l and the CAN port circuit 200 to isolate the surge energy on the recessive line can_l. The second protection circuit 110 may further include 4, 6, etc. second protection sub-circuits 111, and in the same connection manner as described above, the second protection sub-circuits with equal number are set on the dominant line can_h and the recessive line can_l in the CAN signal bus.
The second protection circuit 110 of this embodiment is provided with at least two second protection sub-circuits 111, and the second protection sub-circuits 111 are respectively connected in series between the node where the first protection circuit 120 is connected with the dominant line can_h and the CAN port circuit 200, and between the node where the first protection circuit 120 is connected with the recessive line can_l and the CAN port circuit 200, when the surge energy attenuated by the first protection circuit 120 is connected in series with the recessive line can_l or the dominant line can_h, or when the surge energy flows through the recessive line can_l and the dominant line can_h at the same time, the second protection sub-circuits 111 CAN absorb the surge energy on any one or two signal lines, so as to isolate the surge energy entering the post protection circuit.
Optionally, the second protection sub-circuit 111 includes a transient blocking unit (refer to fig. 6), an input end of the transient blocking unit is connected to a connection point of the first protection sub-circuit 121 and the dominant line can_h, or an input end of the transient blocking unit is connected to a connection point of the first protection sub-circuit 121 and the recessive line can_l, and an output end of the transient blocking unit is grounded. The transient blocking unit has high response speed, becomes a high-resistance state after response, plays a decoupling role in the circuit, and prevents large-energy surge from directly entering the later-stage circuit in series.
Referring to fig. 6, fig. 6 is a schematic diagram illustrating an embodiment of a second protection sub-circuit in the embodiment of fig. 5. As shown in fig. 6, an input terminal of the first transient blocking unit 1111 is connected to a connection point of the first protection sub-circuit 121 and the dominant line can_h, and an output terminal of the first transient blocking unit 1111 is grounded. An input end of the second transient blocking unit 1112 is connected to a connection point of the first protection sub-circuit 121 and the recessive line can_l, and an output end of the second transient blocking unit 1112 is grounded.
The second protection sub-circuit 111 of the embodiment sets the transient blocking unit, when the surge energy attenuated by the first protection circuit 120 is connected in series to the transient blocking unit, the transient blocking unit becomes a high-resistance state, and prevents a large energy surge from being directly connected in series to the later-stage circuit, so that damage of the surge energy to the CAN port circuit 200 is reduced; further, the transient blocking unit plays a decoupling role, and prevents current impact formed in the power supply circuit from influencing the normal operation of the network when the current of the front circuit network and the back circuit network changes.
Optionally, the second protection circuit 110 further includes a capacitor (refer to fig. 7), one end of which is connected to the input terminal of the transient blocking unit, and the other end of which is connected to the output terminal of the transient blocking unit. Referring to fig. 7, fig. 7 is a schematic diagram illustrating a structure of another embodiment of the second protection sub-circuit 111 in the embodiment of fig. 5. As shown in fig. 7, one end of the first capacitor 1121 is connected to the input terminal of the first transient blocking unit 1111, and the other end thereof is connected to the output terminal of the first transient blocking unit 1111. One end of the second capacitor 1122 is connected to the input terminal of the second transient blocking unit 1112, and the other end is connected to the output terminal of the second transient blocking unit 1112.
The second protection sub-circuit 111 of the embodiment can block the damage of low-frequency high-energy surge to the subsequent stage and can absorb high-frequency electrostatic residual energy by arranging a capacitor connected in parallel with the transient blocking unit; further, the capacitor can also keep the voltage balance at two ends of the transient blocking unit, and plays a role in protecting the transient blocking unit.
Alternatively, other embodiments of the second guard sub-circuit 111 may include a positive temperature coefficient thermistor to absorb surge energy.
Optionally, referring to fig. 8, fig. 8 is a schematic structural diagram of another embodiment of the protection circuit provided in the present application. As shown in fig. 8, the protection circuit 100 further includes a third protection circuit 130, where an input end of the third protection circuit 130 is connected to a signal bus between the second protection circuit 110 and the CAN port circuit 200, and an output end thereof is grounded for absorbing static electricity and surge energy.
The protection circuit 100 of the present embodiment further includes a third protection circuit 130, where an input end of the third protection circuit 130 is connected to a signal bus between the second protection circuit 110 and the CAN port circuit 200, and an output end thereof is grounded. By the above method, the third protection circuit 130 is configured to further reduce damage of the CAN port circuit 200 caused by the surge energy due to residual static electricity and the surge energy after being attenuated by the first protection circuit 120 and the second protection circuit 110.
Optionally, referring to fig. 9, fig. 9 is a schematic structural diagram of an embodiment of the third protection circuit in the embodiment of fig. 8. As shown in fig. 9, the CAN signal bus includes a dominant line can_h and a recessive line can_l; the third protection circuit 130 includes at least two third protection sub-circuits 131, wherein an input end of one third protection sub-circuit 131 is connected to the dominant line can_h, and an output end thereof is grounded. The input end of the other third protection subcircuit 131 is connected to the recessive line can_l, and the output end thereof is grounded.
The third protection circuit 130 of this embodiment is provided with at least two third protection sub-circuits 131, so that when the surge energy attenuated by the first protection circuit 120 and the second protection circuit 110 is serially connected into the recessive line can_l or the dominant line can_h, or simultaneously flows through the recessive line can_l and the dominant line can_h, the third protection sub-circuits 131 CAN absorb the surge energy on any one or two signal lines, thereby further absorbing residual static electricity and the surge energy, and further reducing the damage of the surge energy and static electricity to the CAN port circuit 200.
Optionally, the third protection sub-circuit 131 includes a low-power transient suppression diode, an input terminal of the low-power transient suppression diode is connected between the dominant line can_h and the CAN port circuit 200, or an input terminal of the low-power transient suppression diode is connected between the recessive line can_l and the CAN port circuit 200, and an output terminal thereof is grounded. Referring to fig. 10, fig. 10 is a schematic diagram illustrating an embodiment of a third protection sub-circuit in the embodiment of fig. 9. As shown in fig. 10, a first end of the first low power transient suppression diode 1311 is connected between the dominant line can_h and the CAN port circuit 200, and a second end of the first low power transient suppression diode 1311 is grounded. A first end of the second low power transient suppression diode 1312 is connected between the dominant line can_l and the CAN port circuit 200, and a second end of the second low power transient suppression diode 1312 is grounded.
The third protection sub-circuit 131 of the present embodiment CAN further reduce the damage of the surge energy to the CAN port circuit 200 by providing a low-power transient suppression diode to absorb the residual surge energy and static electricity.
Referring to fig. 11, fig. 11 is a schematic structural diagram of a protection circuit according to another embodiment of the present application. As shown in fig. 11, the CAN signal bus includes a dominant line can_h and a recessive line can_l, and the dominant line can_h and the CAN port circuit 200 are respectively provided with: a first end of the first high-power transient suppression diode 1211 is connected to the dominant line can_h, a second end of the first high-power transient suppression diode is connected to the first end of the first semiconductor discharge tube 1221, and a second end of the first semiconductor discharge tube 1221 is grounded; the first transient blocking unit 1111 is disposed in parallel with the first capacitor 1121, and a first end of the first transient blocking unit 1111 is connected to a connection point where the first high power transient suppression diode 1211 is connected to the dominant line can_h, a second end of the first transient blocking unit 1111 is connected to the CAN port circuit, and a second end of the first transient blocking unit 1111 is connected to a first end of the first low power transient suppression diode 1311, and a second end of the first low power transient suppression diode 1311 is grounded. The recessive lines can_l and CAN port circuits 200 are respectively provided with: a first end of the second high-power transient suppression diode 1212 is connected to the dominant line can_l, a second end thereof is connected to a first end of the second semiconductor discharge tube 1222, and a second end of the second semiconductor discharge tube 1222 is grounded; the second transient blocking unit 1112 is arranged in parallel with the second capacitor 1122, and a first end of the second transient blocking unit 1112 is connected to a connection point where the second high power transient suppression diode 1212 is connected to the dominant line can_l, a second end of the second transient blocking unit 1112 is connected to the CAN port circuit, and a second end of the second transient blocking unit 1112 is connected to a first end of the second low power transient suppression diode 1312, and a second end of the second low power transient suppression diode 1312 is grounded.
The present application further proposes a CAN port, referring to fig. 12, fig. 12 is a schematic structural diagram of an embodiment of the CAN port proposed in the present application. As shown in fig. 12, the CAN port 300 includes a protection circuit 310, wherein the protection circuit 310 may be any of the protection circuits of the above embodiments. The CAN port also includes a CAN signal transceiver, and the protection circuit 310 may be used to reduce damage to the CAN signal transceiver from surge energy and static electricity.
The foregoing is only the embodiments of the present application, and not the patent scope of the present application is limited by the foregoing description, but all equivalent structures or equivalent processes using the contents of the present application and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the patent protection scope of the present application.
Claims (11)
1. A protection circuit, wherein the protection circuit is connected between a CAN signal bus and a CAN port circuit, the protection circuit at least comprising:
the input end of the first protection circuit is connected with the CAN signal bus, and the output end of the first protection circuit is grounded and used for absorbing static electricity and surge energy;
the second protection circuit is connected in series between the connection point of the first protection circuit and the CAN signal bus and the CAN port circuit and is used for isolating surge energy.
2. The protection circuit of claim 1, wherein the CAN signal bus comprises a dominant line and a recessive line;
the first protection circuit comprises at least two first protection sub-circuits, wherein the input end of one first protection sub-circuit is connected with the dominant line, and the output end of the first protection sub-circuit is grounded to receive static electricity and surge energy of the dominant line;
the input end of the other first protection subcircuit is connected with the hidden line, and the output end of the other first protection subcircuit is grounded to receive static electricity and surge energy of the hidden line.
3. The protection circuit of claim 2, wherein the first protection sub-circuit comprises:
a high power transient suppression diode, a first end of which is connected to either the dominant line or the recessive line, respectively, and a second end of which is grounded.
4. The protection circuit of claim 3, wherein the first protection sub-circuit further comprises:
and the first end of the semiconductor discharge tube is connected with the second end of the transient suppression diode, and the second end of the semiconductor discharge tube is grounded.
5. The protection circuit of claim 2, wherein the second protection circuit comprises at least two second protection subcircuits, one of the second protection subcircuits being connected in series between a connection point of the first protection subcircuit and the dominant line and the CAN port circuit to isolate surge energy on the dominant line;
the other second protection subcircuit is connected in series between the connection point of the other first protection subcircuit and the hidden line and the CAN port circuit so as to isolate surge energy on the hidden line.
6. The protection circuit of claim 5, wherein the second protection sub-circuit comprises:
and the input end of the transient blocking unit is connected with the connection point of the first protection subcircuit and the dominant line or the recessive line, and the output end of the transient blocking unit is connected with the port circuit.
7. The protection circuit of claim 6, wherein the second protection circuit further comprises:
one end of the capacitor is connected with the input end of the transient blocking unit, and the other end of the capacitor is connected with the output end of the transient blocking unit.
8. The protection circuit of claim 1, further comprising:
and the input end of the third protection circuit is connected with the signal bus between the second protection circuit and the CAN port circuit, and the output end of the third protection circuit is grounded and is used for absorbing static electricity and surge energy.
9. The protection circuit of claim 8, wherein the CAN signal bus comprises a dominant line and a recessive line; the third protection circuit comprises at least two third protection subcircuits, the input end of one third protection subcircuit is connected with the dominant line, and the output end of the third protection subcircuit is grounded;
the input end of the other third protection subcircuit is connected with the hidden line, and the output end of the third protection subcircuit is grounded.
10. The protection circuit of claim 9, wherein the third protection sub-circuit comprises: the input end of the low-power transient suppression diode is connected between the dominant line and the CAN port circuit, or the input end of the low-power transient suppression diode is connected between the recessive line and the CAN port circuit, and the output end of the low-power transient suppression diode is grounded.
11. A CAN port, comprising:
the protection circuit of any one of claims 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222907787.2U CN219123927U (en) | 2022-10-28 | 2022-10-28 | Protection circuit and CAN port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222907787.2U CN219123927U (en) | 2022-10-28 | 2022-10-28 | Protection circuit and CAN port |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219123927U true CN219123927U (en) | 2023-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222907787.2U Active CN219123927U (en) | 2022-10-28 | 2022-10-28 | Protection circuit and CAN port |
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| Country | Link |
|---|---|
| CN (1) | CN219123927U (en) |
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2022
- 2022-10-28 CN CN202222907787.2U patent/CN219123927U/en active Active
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