CN215646785U - CAN transmitting-receiving isolating device - Google Patents
CAN transmitting-receiving isolating device Download PDFInfo
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- CN215646785U CN215646785U CN202120594103.0U CN202120594103U CN215646785U CN 215646785 U CN215646785 U CN 215646785U CN 202120594103 U CN202120594103 U CN 202120594103U CN 215646785 U CN215646785 U CN 215646785U
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Abstract
The utility model provides a CAN transmitting and receiving isolating device, comprising: a DC power supply for outputting a first DC voltage; the input end of the isolation power supply is connected with the output end of the direct current power supply and is used for converting the first direct current voltage into a second direct current voltage; the power input end of the CAN bus controller is connected with a direct-current power supply; the first power input end of the CAN bus transceiver is connected with the output end of the direct-current power supply, the second power input end of the CAN bus transceiver is connected with the output end of the isolation power supply, and the receiving port and the transmitting port of the CAN bus transceiver are respectively connected with the output end of the CAN bus controller. The beneficial effects are that: compared with the prior art, the utility model has simple circuit connection and strong practicability, reduces the mutual influence among the modules through the mutual isolation among the modules, realizes the reduction of the electromagnetic radiation of the modules, greatly increases the electromagnetic anti-interference capability and further ensures the stability of data transmission.
Description
Technical Field
The utility model relates to the technical field of communication, in particular to a CAN transmitting and receiving isolating device.
Background
With the gradual development of the internet of things technology, the CAN protocol has become one of the most widely used field buses in the market and is also one of the field buses with the most development potential, because the CAN protocol has the advantages of real-time performance and reliability of data transmission.
In the actual application environment of the CAN protocol, industrial equipment often receives electromagnetic interference, and the modules of the equipment also have mutual interference, which is very easy to cause damage to the CAN transceiver. Therefore, a CAN transceiver isolator is proposed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides a CAN transmitting and receiving isolating device, which comprises:
a DC power supply for outputting a first DC voltage;
the input end of the isolation power supply is connected with the output end of the direct current power supply and is used for converting the first direct current voltage into a second direct current voltage;
the power input end of the CAN bus controller is connected with the direct-current power supply;
the first power input end of the CAN bus transceiver is connected with the output end of the direct-current power supply, the second power input end of the CAN bus transceiver is connected with the output end of the isolation power supply, and the receiving port and the sending port of the CAN bus transceiver are respectively connected with the output end of the CAN bus controller.
Preferably, the isolation power supply and the CAN bus transceiver are arranged in a shielding shell.
Preferably, the input end of the shielding power supply comprises a VCC input end and a GND input end, and a first filter capacitor is connected between the VCC input end and the GND input end.
Preferably, a second filter capacitor is connected between the VCC input terminal and the shielding shell.
Preferably, a third filter capacitor is connected between the GND input end and the shielding shell.
Preferably, the output end of the shielding power supply comprises a VCC output end and a GND output end, and a fourth filter capacitor is connected between the VCC output end and the GND output end.
Preferably, the input terminal of the dc power supply is connected to an external voltage through a first common mode inductor.
Preferably, a voltage dependent resistor is connected between the input ends of the first common mode inductor, and a fifth filter capacitor is connected between the output ends of the first common mode inductor.
Preferably, the output end of the CAN bus transceiver is connected to the CAN bus through a second common mode inductor.
Preferably, a sixth filter capacitor is connected between the output ends of the second common mode inductors.
The technical scheme has the following advantages or beneficial effects: compared with the prior art, the utility model has simple circuit connection and strong practicability, reduces the mutual influence among the modules through the mutual isolation among the modules, realizes the reduction of the electromagnetic radiation of the modules, greatly increases the electromagnetic anti-interference capability and further ensures the stability of data transmission.
Drawings
Fig. 1 is a schematic structural diagram of a CAN transceiver isolator according to a preferred embodiment of the present invention.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments. The present invention is not limited to the embodiment, and other embodiments may be included in the scope of the present invention as long as the gist of the present invention is satisfied.
In a preferred embodiment of the present invention, based on the above problems in the prior art, there is provided a CAN transceiver isolator as shown in fig. 1, including:
a DC power supply 1 for outputting a first DC voltage;
the input end of the isolation power supply 2 is connected with the output end of the direct current power supply 1 and is used for converting the first direct current voltage into a second direct current voltage;
a CAN bus controller 3, the power input end is connected with the DC power supply 1;
a CAN bus transceiver 4, the output of DC power supply 1 is connected to CAN bus transceiver 4's first power input end, and the output of isolation power supply 2 is connected to CAN bus transceiver 4's second power input end, and CAN bus transceiver 4's receiving port and transmission port connect CAN bus controller 3's output respectively.
A specific embodiment is now provided to further explain and explain the present technical solution:
the direct current power supply 1 is used for providing a stable first direct current voltage, the input end of the isolation power supply 2 converts the received first direct current voltage into a stable second direct current voltage, and the isolation power supply 2 is used for power supply isolation, so that the electromagnetic interference among devices is reduced; a second power input end of the CAN transceiver is connected to the output end of the isolation power supply 2, CAN receive a second direct-current voltage output by the isolation power supply 2, and is used as a driving voltage of a CAN (Controller Area Network) bus transceiver 2; because the receiving port and the sending port of the CAN bus transceiver 4 are respectively connected with the output end of the CAN bus controller 3, the receiving end of the electrified CAN bus transceiver 4 CAN receive the data information processed by the CAN bus controller 3, process and convert the received data information and further forward the data information, thereby realizing the data interaction with the CAN bus controller 3, isolating the output end of the CAN bus controller 3 from the output end and the input end of the CAN bus transceiver 4 to prevent the damage of electromagnetic radiation to the device and further enhancing the electromagnetic interference resistance of the utility model.
In the preferred embodiment of the present invention, the isolated power supply 2 and the CAN bus transceiver 4 are disposed in a shielded housing.
Specifically, in the present embodiment, the shielding casing is used to isolate the isolated power supply 2 and the CAN bus transceiver 4 from the dc power supply 1 and the CAN bus controller 3, so as to reduce the interference of the generated electromagnetic radiation to the isolated power supply 2 and the CAN bus transceiver 4.
In the preferred embodiment of the present invention, the input terminal of the shielding power supply includes a VCC input terminal and a GND input terminal, and a first filter capacitor C1 is connected between the VCC input terminal and the GND input terminal.
In a preferred embodiment, the output terminal of the shielding power supply includes a VCC output terminal and a GND output terminal, and a fourth filter capacitor C4 is connected between the VCC output terminal and the GND output terminal.
Specifically, in the embodiment, the first filter capacitor C1 and the fourth filter capacitor C4 are used for filtering out ac components in the rectifying circuit, so that the output current of the isolated power supply 2 is smoother and more stable.
In the preferred embodiment of the present invention, a second filter capacitor C2 is connected between the VCC input terminal and the shielding housing.
In the preferred embodiment of the present invention, a third filter capacitor C3 is connected between the GND input terminal and the shielding shell.
Specifically, in the present embodiment, the second filter capacitor C2 and the third filter capacitor C3 are connected to enhance the electromagnetic shielding effect of the housing, so as to reduce the electromagnetic radiation emission thereof from interfering with the devices in the housing.
In the preferred embodiment of the present invention, the input terminal of the dc power supply 1 is connected to an external voltage through a first common mode inductor L1.
Specifically, in the present embodiment, an external voltage is used to power devices in the circuit, and is connected through the first common-mode inductor L1 to suppress the emission of electromagnetic waves generated from the outside, so as to reduce the interference of external electromagnetic waves.
In the preferred embodiment of the present invention, a voltage dependent resistor is connected between the input terminals of the first common mode inductor L1, and a fifth filter capacitor C5 is connected between the output terminals of the first common mode inductor L1.
Specifically, in this embodiment, a voltage dependent resistor is connected to prevent the circuit from being damaged by a lightning surge, so as to protect the circuit, and the fifth filter capacitor C5 is used to cooperate with the first common mode inductor L1 to reduce the electromagnetic interference signal transmitted via the external voltage.
In the preferred embodiment of the present invention, the output terminal of the CAN bus transceiver 4 is connected to the CAN bus through a second common mode inductor L2.
Specifically, in this embodiment, the second common-mode inductor L2 is connected to the CAN bus, so that interference of the electromagnetic signal to the CAN bus CAN be prevented.
In the preferred embodiment of the present invention, a sixth filter capacitor C6 is connected between the output terminals of the second common mode inductor L2.
Specifically, in the present embodiment, the common mode inductor L2 is used to filter out electromagnetic noise in the circuit, and prevent electromagnetic radiation from affecting the CAN bus.
Compared with the prior art, the data transmission circuit is simple in circuit connection and high in practicability, mutual influence among modules is reduced through mutual isolation among the modules, electromagnetic radiation is reduced, electromagnetic anti-interference capacity is greatly improved, and data transmission stability is guaranteed.
While the utility model has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model.
Claims (10)
1. A CAN transceiver isolator, comprising:
a DC power supply for outputting a first DC voltage;
the input end of the isolation power supply is connected with the output end of the direct current power supply and is used for converting the first direct current voltage into a second direct current voltage;
the power input end of the CAN bus controller is connected with the direct-current power supply;
the first power input end of the CAN bus transceiver is connected with the output end of the direct-current power supply, the second power input end of the CAN bus transceiver is connected with the output end of the isolation power supply, and the receiving port and the sending port of the CAN bus transceiver are respectively connected with the output end of the CAN bus controller.
2. The CAN transceiver isolator of claim 1, wherein said isolated power supply and said CAN bus transceiver are disposed within a shielded housing.
3. The CAN transceiver isolator of claim 2, wherein the input terminals of the isolated power supply comprise a VCC input terminal and a GND input terminal, and a first filter capacitor is connected between the VCC input terminal and the GND input terminal.
4. The CAN transceiver isolator of claim 3, wherein a second filter capacitor is coupled between said VCC input terminal and said shielded housing.
5. The CAN transmit-receive isolation device of claim 3, wherein a third filter capacitor is connected between the GND input terminal and the shielding shell.
6. The CAN transceiver isolator of claim 2, wherein the output of the isolated power supply comprises a VCC output and a GND output, and a fourth filter capacitor is connected between the VCC output and the GND output.
7. The CAN transceiver isolator of claim 1, wherein the input of the dc power supply is coupled to an external voltage through a first common mode inductor.
8. The CAN transceiver isolator of claim 7, wherein a voltage dependent resistor is connected between the input terminals of the first common mode inductor, and a fifth filter capacitor is connected between the output terminals of the first common mode inductor.
9. The CAN transceiver isolator of claim 1 wherein the output of said CAN bus transceiver is coupled to the CAN bus through a second common mode inductor.
10. The CAN transceiver isolator of claim 9, wherein a sixth filter capacitor is connected between the output terminals of the second common mode inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120594103.0U CN215646785U (en) | 2021-03-23 | 2021-03-23 | CAN transmitting-receiving isolating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120594103.0U CN215646785U (en) | 2021-03-23 | 2021-03-23 | CAN transmitting-receiving isolating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215646785U true CN215646785U (en) | 2022-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120594103.0U Active CN215646785U (en) | 2021-03-23 | 2021-03-23 | CAN transmitting-receiving isolating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215646785U (en) |
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2021
- 2021-03-23 CN CN202120594103.0U patent/CN215646785U/en active Active
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