CN210899210U

CN210899210U - Anti-interference CAN communication circuit

Info

Publication number: CN210899210U
Application number: CN202020221496.6U
Authority: CN
Inventors: 张顺顺; 梁记斌; 李倞
Original assignee: Shandong Chaoyue CNC Electronics Co Ltd
Current assignee: Shandong Chaoyue CNC Electronics Co Ltd
Priority date: 2020-02-28
Filing date: 2020-02-28
Publication date: 2020-06-30
Anticipated expiration: 2030-02-28

Abstract

An anti-interference CAN communication circuit is provided with a CAN transceiver I and a CAN transceiver II which provide two CAN transceiving circuits, wherein a capacitor I, a capacitor II, a capacitor III, a capacitor IV, a capacitor V and a capacitor VI are all filter capacitors, signal smoothness is improved, and the resistors are load resistors to ensure the use safety of a power isolation module. The power isolation module CAN improve the efficiency of constant-voltage input and non-constant-voltage output of the CAN communication circuit, so that the CAN communication circuit has high reliability and excellent particle characteristics, and the photoelectric isolation module CAN isolate an interference source in the CAN communication circuit from the CAN transceiver I and the CAN transceiver II, thereby improving the reliability and anti-interference performance of data communication of the CAN communication circuit.

Description

Anti-interference CAN communication circuit

Technical Field

The utility model relates to a CAN bus technical field, concretely relates to anti-interference CAN communication circuit.

Background

A Controller Area Network (CAN) bus is a serial communication protocol bus for real-time applications, which CAN use twisted pair wires to transmit signals, and is one of the most widely used field buses in the world. The CAN protocol is used for communication between various components in an automobile, thereby replacing expensive and bulky wiring harnesses. The robustness of the protocol extends its use to other automation and industrial applications. The features of the CAN protocol include serial data communication for integrity, real-time support, transmission rates up to 1Mb/s, and 11-bit addressing and error detection capabilities. The CAN bus uses serial data transmission mode, CAN operate on 40m twisted pair wires at the rate of 1Mb/s, CAN use optical cable connection, and the bus protocol supports multi-master controller on the bus. However, the existing CAN bus has poor interference resistance and is easily subjected to electronic interference.

Disclosure of Invention

The utility model discloses an overcome the not enough of above technique, provide an improve communication reliability and improve interference immunity's CAN communication circuit.

The utility model overcomes the technical scheme that its technical problem adopted is:

an interference resistant CAN communication circuit, comprising:

the photoelectric isolation module is grounded on GND1 pin and GND2 pin, VCC1 pin is respectively connected with 5V power supply and grounded through capacitor IV, INC pin is connected with RXD pin of CAN transceiver I, OUTA pin is connected with TXD pin of CAN transceiver I, IND pin is connected with RXD pin of CAN transceiver II, OUTB pin is connected with TXD pin of CAN transceiver II, and VCC pin is grounded through capacitor III;

a capacitor VI is connected in parallel between a Vin pin and a GND pin of the power isolation module, the Vin pin is connected to a 5V power supply, the GND pin is grounded, a Vout pin of the capacitor V is respectively connected to a VCC2 pin of the photoelectric isolation module, a VCC pin of the CAN transceiver I and a VCC pin of the CAN transceiver II, one end of the capacitor V is connected to the Vout pin of the power isolation module after the capacitor V is connected in parallel with the resistor, the other end of the capacitor V is connected to the GND pin of the power isolation module, and the GND pin of the power isolation module is grounded;

a GND pin and an RS pin of the CAN transceiver I are grounded, and a VCC pin of the CAN transceiver I is grounded through a capacitor I;

and the GND pin and the RS pin of the CAN transceiver II are grounded, and the VCC pin of the CAN transceiver II is grounded through a capacitor II.

Preferably, the CAN transceiver i is a TJA1051 type CAN transceiver.

Preferably, the CAN transceiver ii is a TJA1051 type CAN transceiver.

Preferably, the power isolation module is a ZY0505FS-1W power isolation module.

Preferably, the optoelectronic isolation module is an ISO7742FQDWQ1 type optoelectronic isolation module.

The utility model has the advantages that: the CAN transceiver I and the CAN transceiver II are arranged to provide two CAN transceiving circuits, the capacitor I, the capacitor II, the capacitor III, the capacitor IV, the capacitor V and the capacitor VI are all filter capacitors, signal smoothness is improved, and the resistor is a load resistor, so that the use safety of the power isolation module is ensured. The power isolation module CAN improve the efficiency of constant-voltage input and non-constant-voltage output of the CAN communication circuit, so that the CAN communication circuit has high reliability and excellent particle characteristics, and the photoelectric isolation module CAN isolate an interference source in the CAN communication circuit from the CAN transceiver I and the CAN transceiver II, thereby improving the reliability and anti-interference performance of data communication of the CAN communication circuit.

Drawings

FIG. 1 is a circuit diagram of the present invention;

in the figure, 1, a CAN transceiver I2, a CAN transceiver II 3, a power isolation module 4, a photoelectric isolation module 5, a capacitor I6, a capacitor II 7, a capacitor III 8, a capacitor IV 9, a resistor V9, a capacitor V11 and a capacitor VI.

Detailed Description

The present invention will be further explained with reference to fig. 1.

An interference resistant CAN communication circuit, comprising: the photoelectric isolation module 4 is grounded through a capacitor III 7, wherein a GND1 pin and a GND2 pin of the photoelectric isolation module are grounded, a VCC1 pin of the photoelectric isolation module is respectively connected with a 5V power supply and grounded through a capacitor IV 8, an INC pin of the photoelectric isolation module is connected with an RXD pin of a CAN transceiver I1, an OUTA pin of the photoelectric isolation module is connected with a TXD pin of the CAN transceiver I1, an IND pin of the photoelectric isolation module is connected with an RXD pin of a CAN transceiver II 2, an OUTB pin of the photoelectric isolation module is connected with a TXD pin of a CAN transceiver II 2; a capacitor VI 11 is connected in parallel between a Vin pin and a GND pin of the power isolation module 3, the Vin pin is connected to a 5V power supply, the GND pin is grounded, a Vout pin is respectively connected to a VCC2 pin of the photoelectric isolation module 4, a VCC pin of the CAN transceiver I1 and a VCC pin of the CAN transceiver II 2, one end of the capacitor V10 is connected to the Vout pin of the power isolation module 3 after being connected in parallel with a resistor 9, the other end of the capacitor V10 is connected to the GND pin of the power isolation module 3, and the GND pin of the power isolation module 3 is grounded; a GND pin and an RS pin of the CAN transceiver I1 are grounded, and a VCC pin of the CAN transceiver is grounded through a capacitor I5; and a GND pin and an RS pin of the CAN transceiver II 2 are grounded, and a VCC pin of the CAN transceiver II 2 is grounded through a capacitor II 6. The CAN transceiver I1 and the CAN transceiver II 2 are arranged to provide two CAN transceiver circuits, the capacitor I5, the capacitor II 6, the capacitor III 7, the capacitor IV 8, the capacitor V10 and the capacitor VI 11 are all filter capacitors, signal smoothness is improved, and the resistor 9 is a load resistor, so that the use safety of the power isolation module is ensured. The power isolation module 3 CAN improve the efficiency of constant-voltage input and non-constant-voltage output of the CAN communication circuit, so that the CAN communication circuit has high reliability and excellent particle characteristics, and the photoelectric isolation module 4 CAN isolate an interference source in the CAN communication circuit from the CAN transceiver I1 and the CAN transceiver II 2, thereby improving the reliability and anti-interference performance of data communication of the CAN communication circuit.

Further, the CAN transceiver i 1 is a TJA1051 type CAN transceiver. The TJA1051 type CAN transceiver has the capabilities of instant anti-interference, Radio Frequency Interference (RFI) reduction and thermal protection, and the current limiting circuit also provides a further protection function for the bus.

Further, the CAN transceiver II 2 adopts a TJA1051 type CAN transceiver. The TJA1051 type CAN transceiver has the capabilities of instant anti-interference, Radio Frequency Interference (RFI) reduction and thermal protection, and the current limiting circuit also provides a further protection function for the bus.

Furthermore, the power isolation module 3 adopts a model ZY0505FS-1W and adopts a power isolation module.

Further, the photoelectric isolation module 4 adopts an ISO7742FQDWQ1 type photoelectric isolation module.

The above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. An interference resistant CAN communication circuit, comprising:

the photoelectric isolation module (4) is grounded on GND1 pin and GND2 pin, VCC1 pin is respectively connected with a 5V power supply and grounded through a capacitor IV (8), INC pin is connected with RXD pin of the CAN transceiver I (1), OUTA pin is connected with TXD pin of the CAN transceiver I (1), IND pin is connected with RXD pin of the CAN transceiver II (2), OUTB pin is connected with TXD pin of the CAN transceiver II (2), and VCC pin is grounded through a capacitor III (7);

the device comprises a power isolation module (3), a capacitor VI (11) is connected in parallel between a Vin pin and a GND pin of the power isolation module (3), the Vin pin is connected to a 5V power supply, the GND pin is grounded, a Vout pin of the Vout pin is respectively connected to a VCC2 pin of a photoelectric isolation module (4), a VCC pin of a CAN transceiver I (1) and a VCC pin of a CAN transceiver II (2), one end of the capacitor V (10) is connected to a Vout pin of the power isolation module (3) after being connected in parallel with a resistor (9), the other end of the capacitor V (10) is connected to the GND pin of the power isolation module (3), and the GND pin of the power isolation module;

a GND pin and an RS pin of the CAN transceiver I (1) are grounded, and a VCC pin of the CAN transceiver I (1) is grounded through a capacitor I (5);

and the GND pin and the RS pin of the CAN transceiver II (2) are grounded, and the VCC pin of the CAN transceiver II is grounded through a capacitor II (6).

2. The anti-jam CAN communication circuit of claim 1 further comprising: the CAN transceiver I (1) adopts a TJA1051 type CAN transceiver.

3. The anti-jam CAN communication circuit of claim 1 further comprising: and the CAN transceiver II (2) adopts a TJA1051 type CAN transceiver.

4. The anti-jam CAN communication circuit of claim 1 further comprising: the power isolation module (3) adopts a ZY0505FS-1W type power isolation module.

5. The anti-jam CAN communication circuit of claim 1 further comprising: the photoelectric isolation module (4) adopts an ISO7742FQDWQ1 type photoelectric isolation module.