CN213693991U

CN213693991U - Adapter for converting Ethernet interface into CAN bus interface

Info

Publication number: CN213693991U
Application number: CN202023205710.8U
Authority: CN
Inventors: 尹叶丹
Original assignee: Wuhan Jiyang Photoelectric Technology Co ltd
Current assignee: Wuhan Jiyang Photoelectric Technology Co ltd
Priority date: 2020-12-26
Filing date: 2020-12-26
Publication date: 2021-07-13
Anticipated expiration: 2030-12-26

Abstract

The utility model provides an adapter of ethernet interface to CAN bus interface, through setting up the matching circuit, make network transformer and ethernet interface impedance match, the common mode noise interference signal of filtering improves the stability of signal, strengthens the interference killing feature of adapter; by arranging the first filter circuit and the second filter circuit, common-mode noise interference signals are filtered, the stability of the signals is further improved, and the anti-interference capability of the adapter is enhanced; by setting a reset interface which is used as an interface for restoring the initial parameters of the adapter, the wiring state of the reset interface is manually controlled, and when the reset interface is grounded, the MCU chip restores the internal parameters to the initial parameters; the power supply conversion module and the isolation circuit are arranged to provide an isolation power supply for the photoelectric isolation module, so that the power supply isolation of the photoelectric isolation module is realized, the isolation characteristic of the photoelectric isolation module is improved, and the stability of signals in the protocol conversion process of the adapter is further improved.

Description

Adapter for converting Ethernet interface into CAN bus interface

Technical Field

The utility model relates to a data conversion, industrial control technical field especially relate to ethernet interface changes CAN bus interface's adapter.

Background

The appearance of a CAN (controller area network) field bus provides powerful technical support for realizing real-time and reliable data communication among nodes of a distributed control system. The security and network survivability of the industrial Ethernet are also improved to a great extent, so that the industrial Ethernet is widely applied to the field of industrial control. At present, computers are widely applied to various control fields, a common connection port of the computer is Ethernet, and the computer can be involved in various control systems as long as the interface standards are unified and necessary software is installed. Therefore, in order to improve efficiency, it is necessary to adopt technical means to realize the integration of a computer into a CAN network through an ethernet interface, and combine the long-distance transmission performance of the ethernet with the speciality of the CAN to combine the advantages.

Although the network transformer is arranged in the existing adapter for converting the Ethernet interface into the CAN bus interface to enhance the anti-interference capability of the adapter, the network transformer cannot completely filter common-mode noise interference signals because a large number of common-mode noise interference signals exist in the protocol conversion process, and finally the signals in the protocol conversion process are unstable.

Therefore, in order to solve the above problem, the utility model provides an adapter of ethernet interface commentaries on classics CAN bus interface through setting up filter circuit, and complete filtering common mode noise interference signal improves the stability of signal, and the interference killing feature of adapter is strong.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an adapter of ethernet interface commentaries on classics CAN bus interface, through setting up filter circuit, the stability of signal is improved to complete filtering common mode noise interference signal, and the interference killing feature of adapter is strong.

The technical scheme of the utility model is realized like this: the utility model provides an adapter for converting an Ethernet interface into a CAN bus interface, which comprises an MCU chip, an Ethernet interface, a network transformer, an Ethernet controller, a CAN communication module, a CAN bus signal interface, a first filter circuit and a second filter circuit;

the signal interface of the Ethernet interface is electrically connected with the input end of a network transformer, the output end of the network transformer is respectively electrically connected with the input end of an Ethernet controller, the input end of a first filter circuit and the input end of a second filter circuit, the output end of the first filter circuit and the output end of the second filter circuit are both grounded, the output end of the Ethernet controller is electrically connected with the I/O port of an MCU chip, and the I/O port of the MCU chip is electrically connected with a CAN bus signal interface through a CAN communication module.

On the basis of the above technical solution, preferably, the first filter circuit includes a resistor R3, a resistor R5, and a capacitor C5;

the output end of the network transformer is electrically connected with one end of the resistor R3 and one end of the resistor R5 respectively, the other end of the resistor R3 and the other end of the resistor R5 are both electrically connected with one end of the capacitor C5, and the other end of the capacitor C5 is grounded.

On the basis of the above technical solution, preferably, the mobile terminal further comprises a matching circuit;

the input end of the matching circuit is electrically connected with the pin of the Ethernet interface and the center tap of the network transformer respectively, and the output end of the matching circuit is grounded.

Still further preferably, the matching circuit includes resistors R7-R10 and a capacitor C29;

the pins of the ethernet interface are electrically connected to one end of a resistor R9 and one end of a resistor R10, respectively, the center tap of the network transformer is electrically connected to one end of a resistor R8 and one end of a resistor R7, respectively, the other end of a resistor R7, the other end of a resistor R8, the other end of a resistor R9 and the other end of a resistor R10 are electrically connected to one end of a capacitor C29, and the other end of the capacitor C29 is grounded.

On the basis of the above technical scheme, preferably, the CAN communication module includes a first CAN communication module and a second CAN communication module;

the I/O port of the MCU chip is electrically connected with the input end of the first CAN communication module and the input end of the second CAN communication module respectively, and the output end of the first CAN communication module and the output end of the second CAN communication module are electrically connected with the CAN bus signal interface.

Still further preferably, the first CAN communication module further comprises a CAN controller, a CAN bus transceiver and a photoelectric isolation module;

the I/O port of the MCU chip is electrically connected with the CAN bus signal interface through the CAN controller, the photoelectric isolation module and the CAN bus transceiver which are connected in sequence.

Still further preferably, the device further comprises a power input interface;

the power input interface comprises a power interface and a reset interface;

the external power supply supplies power to each functional module in the adapter through the power interface, and the I/O port of the MCU chip is electrically connected with the reset interface.

Still further preferably, the power supply further comprises a power supply conversion module and an isolation circuit;

the external power supply is electrically connected with the input end of the power supply conversion module through the power interface, the output end of the power supply conversion module is electrically connected with the power end of the MCU chip, the power end of the Ethernet controller, the power end of the CAN controller, the first power end of the photoelectric isolation module and the input end of the isolation circuit respectively, and the output end of the isolation circuit is electrically connected with the second power end of the photoelectric isolation module and the power end of the CAN bus transceiver respectively.

The utility model discloses an adapter that ethernet interface changes CAN bus interface has following beneficial effect for prior art:

(1) by arranging the matching circuit, the impedance of the network transformer is matched with that of the Ethernet interface, common-mode noise interference signals are filtered, the stability of the signals is improved, and the anti-interference capability of the adapter is enhanced;

(2) by arranging the first filter circuit and the second filter circuit, common-mode noise interference signals are filtered, the stability of the signals is further improved, and the anti-interference capability of the adapter is enhanced;

(3) by setting a reset interface which is used as an interface for restoring the initial parameters of the adapter, the wiring state of the reset interface is manually controlled, and when the reset interface is grounded, the MCU chip restores the internal parameters to the initial parameters;

(4) by arranging the photoelectric isolation module, signal isolation is carried out between the CAN controller and the CAN bus transceiver, so that the risk that the internal circuit of the adapter is damaged by spike voltage in the data transmission process due to electromagnetic interference is eliminated;

(5) the power supply conversion module and the isolation circuit are arranged to provide an isolation power supply for the photoelectric isolation module, so that the power supply isolation of the photoelectric isolation module is realized, the isolation characteristic of the photoelectric isolation module is improved, and the stability of signals in the protocol conversion process of the adapter is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a system structure diagram of the adapter for converting Ethernet interface to CAN bus interface according to the present invention;

fig. 2 is a circuit diagram of the ethernet interface, the network transformer, the matching circuit, the first filter circuit and the second filter circuit in the adapter for converting the ethernet interface into the CAN bus interface of the present invention;

fig. 3 is a circuit diagram of an ethernet controller and an MCU chip in the adapter for converting the ethernet interface into the CAN bus interface according to the present invention;

fig. 4 is a circuit diagram of a CAN communication module in the adapter for converting the ethernet interface into the CAN bus interface of the present invention;

fig. 5 is a circuit diagram of the power input interface and the CAN bus signal interface in the adapter for converting the ethernet interface into the CAN bus interface of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in fig. 1, the utility model discloses an adapter of ethernet interface to CAN bus interface, it includes MCU chip, ethernet interface, network transformer, ethernet controller, CAN communication module, CAN bus signal interface, matching circuit, first filter circuit, second filter circuit, power input interface, power conversion module and isolating circuit.

And the Ethernet interface is used as an interface for connecting the MCU chip and the host and used as a data input end for converting the Ethernet interface-CAN. In this embodiment, the signal interface of the ethernet interface is electrically connected to the input terminal of the network transformer, and the pin of the ethernet interface is electrically connected to the input terminal of the matching circuit. As shown in fig. 2, the ethernet interface of the present embodiment is a standard RJ45 ethernet interface, and

pins

1, 2, 3, and 6 of the RJ45 ethernet interface are signal interfaces of the ethernet interface;

pins

4, 5, 6 and 8 are empty pins of the Ethernet interface;

pins

1 and 2 of the RJ45 ethernet interface serve as ETH _ TX + pins;

pins

3 and 6 serve as ETH _ RX-pins.

The network transformer has two functions, namely, the first function is used for signal level coupling and signal enhancement, so that the data transmission distance of the adapter is longer, and the second function is used for isolating the adapter from the outside and enhancing the anti-interference capability of the adapter. In this embodiment, an input terminal of the network transformer is electrically connected to the signal interface of the ethernet interface, a center tap of the network transformer is electrically connected to an input terminal of the matching circuit, and an output terminal of the network transformer is electrically connected to an input terminal of the ethernet controller, an input terminal of the first filter circuit, and an input terminal of the second filter circuit, respectively. Preferably, as shown in fig. 2, the network transformer is an H1102 network transformer;

pins

15, 10, 2 and 7 of the H1102 are respectively used as central taps of the network transformer;

pins

15 and 10 are center taps connected to the input of the matching circuit;

pins

9, 11, 14 and 16 of the H1102 are input ends of the network transformer;

pins

1, 3, 6, 8 of H1102 are the output terminals of the network transformer.

And the matching circuit is used for matching the impedance of the network transformer and the Ethernet interface, filtering common-mode noise interference signals, improving the stability of the signals and enhancing the anti-interference capability of the adapter. In this embodiment, the input terminal of the matching circuit is electrically connected to the pin of the ethernet interface and the center tap of the network transformer, respectively, and the output terminal of the matching circuit is grounded. Preferably, as shown in fig. 2, the matching circuit includes resistors R7-R10, a capacitor C29; the pins of the ethernet interface are electrically connected to one end of a resistor R9 and one end of a resistor R10, respectively, the center tap of the network transformer is electrically connected to one end of a resistor R8 and one end of a resistor R7, respectively, the other end of a resistor R7, the other end of a resistor R8, the other end of a resistor R9 and the other end of a resistor R10 are electrically connected to one end of a capacitor C29, and the other end of the capacitor C29 is grounded. The resistors R7-R10 are used for impedance matching of the network transformer and the Ethernet interface, and the capacitor C29 is used for providing a backflow path for common-mode noise interference signals, filtering the common-mode noise interference signals, improving the stability of the signals and enhancing the anti-interference capability of the adapter.

Because the signals output by the Ethernet interface are a pair of differential signals, the differential signals have a large number of common-mode noise interference signals in the transmission process, and the common-mode noise interference signals cannot be completely filtered by a network transformer, so that the signals in the protocol conversion process are unstable; therefore, in order to solve the above problem, in this embodiment, a first filter circuit and a second filter circuit are provided to filter out common mode noise interference signals, so as to further improve the stability of the signals and enhance the anti-interference capability of the adapter. In this embodiment, the input terminal of the first filter circuit and the input terminal of the second filter circuit are both electrically connected to the output terminal of the network transformer, and the output terminal of the first filter circuit and the output terminal of the second filter circuit are both grounded. In this embodiment, the structures and the operating principles of the first filter circuit and the second filter circuit are the same, so only the circuit structure of the first filter circuit is described here, and the circuit structure of the second filter circuit is not described in detail. Preferably, as shown in fig. 2, the first filter circuit includes a resistor R3, a resistor R5, and a capacitor C5; the output end of the network transformer is electrically connected with one end of the resistor R3 and one end of the resistor R5 respectively, the other end of the resistor R3 and the other end of the resistor R5 are both electrically connected with one end of the capacitor C5, and the other end of the capacitor C5 is grounded. On one hand, the resistor R3 and the resistor R5 are used as pull-down resistors, so that output signals of the network transformer are more stable; on the other hand, the capacitors and the capacitor C5 form an RC filter circuit to filter the common mode noise interference signals.

And the Ethernet controller controls the sending and receiving of the Ethernet data and the parameter configuration, and realizes the full duplex communication of the Ethernet data. In this embodiment, the input terminal of the ethernet controller is electrically connected to the output terminal of the network transformer, and the output terminal of the ethernet controller is electrically connected to the I/O port of the MCU chip. In this embodiment, no improvement of the internal algorithm of the ethernet controller is involved, and therefore, the internal algorithm of the ethernet controller is not described again here. Preferably, as shown in fig. 3, the ethernet controller is implemented using an RTL8019AS chip.

The MCU chip is a main controller chip of the adapter for converting the Ethernet interface into the CAN bus interface, receives the Ethernet protocol data transmitted by the host through the Ethernet interface, converts the Ethernet protocol data into CAN protocol data according to the standard protocol converted from the Ethernet interface to the CAN, and transmits the CAN protocol data to the CAN communication module. In this embodiment, the I/O port of the MCU chip is electrically connected to the output terminal of the ethernet controller, the I/O port of the MCU chip is electrically connected to the CAN bus signal interface through the CAN communication module, and the power end of the MCU chip is electrically connected to the output terminal of the power conversion module. The ethernet interface-CAN conversion algorithm belongs to a standard protocol and also belongs to the prior art, and in the embodiment, the improvement on a software algorithm is not involved, and the embodiment mainly protects the interface type and the hardware structure of the adapter. Preferably, as shown in FIG. 3, the MCU chip is a C8051F340/1/4/5 series chip; the REGIN pin is a power supply end of the MCU chip; and the P3.3 pin is an I/O port for connecting the MCU chip with the reset interface.

And the CAN communication module is used for receiving the control signal from the MCU chip, configuring the data transmission of the adapter according to the control signal, converting the communication data output by the I/O port of the MCU chip and outputting CAN differential data to the CAN bus signal interface. In this embodiment, the I/O port of the MCU chip is electrically connected to the CAN bus signal interface through the CAN communication module. Preferably, in this embodiment, the CAN communication module includes a first CAN communication module and a second CAN communication module.

The first CAN communication module and the second CAN communication module are respectively used for receiving control signals from the MCU chip and respectively used for configuring two different CAN transmission rates, so that two terminal devices with different transmission rates CAN be accessed by using an adapter of which one Ethernet interface is converted into a CAN bus interface, and the applicability of the adapter is improved; and on the other hand, the communication data output by the I/O port of the MCU chip are respectively converted and processed, and CAN differential data are output to the corresponding CAN bus signal interface. In this embodiment, the input end of the first CAN communication module and the input end of the second CAN communication module are electrically connected to the I/O port of the MCU chip, and the output end of the first CAN communication module and the output end of the second CAN communication module are electrically connected to the CAN bus signal interface. Preferably, in this embodiment, the first CAN communication module and the second CAN communication module have the same structure and operation principle, and therefore, only the structure and operation principle of the first CAN communication module will be described herein. Preferably, as shown in fig. 1, the first CAN communication module includes a CAN controller, a CAN bus transceiver, and a photoelectric isolation module.

And the CAN controller receives the control signal from the MCU chip, performs parameter setting on data transmission of the adapter according to the control signal, and converts the communication data signal output by the MCU chip into a CAN signal to be input to the photoelectric isolation module. In this embodiment, the I/O port of the MCU chip is electrically connected to the CAN bus interface through the CAN controller, the optoelectronic isolation module, and the CAN bus transceiver, which are connected in sequence. In this embodiment, the improvement of the internal algorithm and the structure of the CAN controller is not involved, so the internal algorithm and the structure of the CAN controller are not described again; preferably, a SJA1000 chip as shown in fig. 4 is used.

And the photoelectric isolation module is used for carrying out signal isolation between the CAN controller and the CAN bus transceiver, and eliminating the risk that the internal circuit of the adapter is damaged by spike voltage in the data transmission process due to electromagnetic interference. In this embodiment, the I/O port of the MCU chip is electrically connected to the CAN bus interface through the CAN controller, the optoelectronic isolation module, and the CAN bus transceiver connected in sequence, the first power end of the optoelectronic isolation module is electrically connected to the output terminal of the power conversion module, and the second power end of the optoelectronic isolation module is electrically connected to the output terminal of the isolation circuit. In this embodiment, the improvement of the structure of the optoelectronic isolation module is not involved, and therefore, the circuit structure of the optoelectronic isolation module is not described again. Preferably, the optoelectronic isolation module is an optical coupler 6N317 as shown in fig. 4; as shown in fig. 4, the optoelectronic isolation module includes two optical couplers 6N317 respectively serving as couplers of transmitting and receiving light of CAN bus data, which are respectively denoted by U9 and U10, wherein the 8 th pin of U10 is a first power supply terminal of the optoelectronic isolation module, and the 8 th pin of U9 is a second power supply terminal of the optoelectronic isolation module.

And the CAN bus transceiver is used for converting the CAN signals output by the photoelectric isolation module and outputting CAN differential data to the CAN bus signal interface. In the embodiment, an I/O port of the MCU chip is electrically connected with an input end of the CAN bus transceiver through the CAN controller and the photoelectric isolation module which are connected in sequence, an output end of the CAN bus transceiver is electrically connected with the CAN bus signal interface, and a power supply end of the CAN bus transceiver is electrically connected with an output end of the isolation circuit; the output end of the CAN bus transceiver corresponds to the output end of the first CAN communication module. Preferably, as shown in fig. 4, the CAN bus transceiver is 82c 250.

And the CAN bus signal interface provides a CAN interface for the adapter. In this embodiment, the CAN bus signal interface is electrically connected to the output end of the second CAN communication module and the output end of the CAN bus transceiver respectively. Preferably, as shown in fig. 4, a10 pin connection terminal is selected as a CAN bus signal interface; pins 1 and 2 of a10 pin wiring terminal are electrically connected with the output end of the CAN bus transceiver;

pins

7 and 8 of the 10pin wiring terminal are electrically connected with the output end of the second CAN communication module.

And the power input interface provides a power interface and a reset interface for the adapter. The reset interface is used as an interface for recovering the initial parameters of the adapter, the wiring state of the reset interface is manually controlled, and when the reset interface is grounded, the MCU chip recovers the internal parameters to the initial parameters. The MCU chip restores the internal parameters to the initial parameters, which belongs to the conventional technical means in the field, and the technical solution of this embodiment is clear and complete for those skilled in the art, and those skilled in the art can implement the technical solution of this embodiment based on the content described in this embodiment and the prior art without any doubt. In this embodiment, the external power source is electrically connected to the input terminal of the power conversion module through the power interface, and the reset interface is electrically connected to the I/O port of the MCU chip. As shown in fig. 4, a 7pin connection terminal is selected as a power input interface; pins 3 and 4 of the 7pin wiring terminal are used as power interfaces; the pin 5 of the 7pin connecting terminal is used as a reset interface.

The power supply conversion module is used for stabilizing the voltage output by an external power supply and outputting the stable voltage to provide working voltage for the MCU chip, the Ethernet controller, the CAN controller, the photoelectric isolation module and the isolation circuit, and the requirement of the adapter on the external power supply is reduced by setting the power supply conversion module, so that the applicability of the adapter is improved; the isolation circuit is used for providing working voltage for the photoelectric isolation module and the CAN bus transceiver, filtering power supply ripple interference signals in a power supply by using the isolation circuit and improving the anti-interference capability of the adapter; the power supply conversion module and the isolation circuit are arranged to provide an isolation power supply for the photoelectric isolation module, so that the power supply isolation of the photoelectric isolation module is realized, the isolation characteristic of the photoelectric isolation module is improved, and the stability of signals in the protocol conversion process of the adapter is further improved. In this embodiment, the improvement of the power conversion module and the isolation circuit structure is not involved, so the circuit structures of the power conversion module and the isolation circuit are not described herein, and preferably, the power conversion module may be a voltage stabilization chip 7805; the isolation circuit can be selected from DC 0505-1W. As shown in fig. 4, +5V is the voltage output by the power conversion module; +5V1 is the voltage of the isolation circuit output. In this embodiment, the external power source is electrically connected to the input terminal of the power conversion module through the power interface, the output terminal of the power conversion module is electrically connected to the power source terminal of the MCU chip, the power source terminal of the ethernet controller, the power source terminal of the CAN controller, the first power source terminal of the optoelectronic isolation module, and the input terminal of the isolation circuit, and the output terminal of the isolation circuit is electrically connected to the second power source terminal of the optoelectronic isolation module and the power source terminal of the CAN bus transceiver.

Because first CAN communication module is the same with second CAN communication module's theory of operation, only introduce here when carrying out data transmission through first communication module and terminal equipment the utility model discloses a concrete theory of operation: the external power supply outputs voltage to the power supply conversion module through the power supply interface to perform voltage stabilization processing, and outputs the stable voltage to provide working voltage for the MCU chip, the Ethernet controller, the CAN controller, the photoelectric isolation module and the isolation circuit; when the reset interface is grounded, the MCU chip controls the adapter to restore the internal parameters to the initial parameters; after the adapter is powered on, when the host computer performs writing operation, the host computer transmits the Ethernet data to the network transformer through the Ethernet interface, the network transformer performs enhancement and isolation processing on the Ethernet data and inputs the isolated Ethernet data to the Ethernet controller, the Ethernet controller controls the sending, receiving and parameter configuration of the Ethernet data and inputs the Ethernet data to the MCU chip, the MCU chip converts the Ethernet data into CAN data and transmits the CAN data to the CAN controller, the CAN controller performs parameter configuration and inputs the CAN data to the photoelectric isolation module for signal isolation, the photoelectric isolation module inputs the CAN data to the CAN bus transceiver, and the CAN bus transceiver converts CAN signals output by the photoelectric isolation module into CAN differential signals and inputs the CAN differential signals to the terminal equipment through the CAN bus signal interface;

when the host computer reads, the terminal device inputs CAN differential data to the CAN bus transceiver through the CAN bus signal interface for conversion processing, the CAN bus transceiver outputs CAN data to the photoelectric isolation module for signal isolation, the photoelectric isolation module inputs the isolated CAN data to the CAN controller, the CAN controller performs parameter configuration and inputs the CAN data to the MCU chip, the MCU chip converts the CAN data into Ethernet data and inputs the Ethernet data to the Ethernet controller to control the transmission, reception and parameter configuration of the Ethernet data, and inputs the Ethernet data to the network transformer for enhancement and isolation processing, and the network transformer inputs the processed Ethernet data to the host computer through the Ethernet interface; meanwhile, the matching circuit, the first filter circuit and the second filter circuit filter common-mode noise interference signals in the Ethernet data transmission process.

The utility model has the advantages that: by arranging the matching circuit, the impedance of the network transformer is matched with that of the Ethernet interface, common-mode noise interference signals are filtered, the stability of the signals is improved, and the anti-interference capability of the adapter is enhanced;

by arranging the first filter circuit and the second filter circuit, common-mode noise interference signals are filtered, the stability of the signals is further improved, and the anti-interference capability of the adapter is enhanced;

by setting a reset interface which is used as an interface for restoring the initial parameters of the adapter, the wiring state of the reset interface is manually controlled, and when the reset interface is grounded, the MCU chip restores the internal parameters to the initial parameters;

by arranging the photoelectric isolation module, signal isolation is carried out between the CAN controller and the CAN bus transceiver, so that the risk that the internal circuit of the adapter is damaged by spike voltage in the data transmission process due to electromagnetic interference is eliminated;

the power supply conversion module and the isolation circuit are arranged to provide an isolation power supply for the photoelectric isolation module, so that the power supply isolation of the photoelectric isolation module is realized, the isolation characteristic of the photoelectric isolation module is improved, and the stability of signals in the protocol conversion process of the adapter is further improved.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Ethernet interface changes CAN bus interface's adapter, and it includes MCU chip, Ethernet interface, network transformer, ethernet controller, CAN communication module and CAN bus signal interface, its characterized in that: the filter also comprises a first filter circuit and a second filter circuit;

the signal interface of the Ethernet interface is electrically connected with the input end of the network transformer, the output end of the network transformer is electrically connected with the input end of the Ethernet controller, the input end of the first filter circuit and the input end of the second filter circuit respectively, the output end of the first filter circuit and the output end of the second filter circuit are both grounded, the output end of the Ethernet controller is electrically connected with the I/O port of the MCU chip, and the I/O port of the MCU chip is electrically connected with the CAN bus signal interface through the CAN communication module.

2. The adapter for converting an ethernet interface to a CAN bus interface of claim 1, wherein: the first filter circuit comprises a resistor R3, a resistor R5 and a capacitor C5;

3. The adapter for converting an ethernet interface to a CAN bus interface of claim 1, wherein: also includes a matching circuit;

4. The adapter for converting an ethernet interface to a CAN bus interface of claim 3, wherein: the matching circuit comprises resistors R7-R10 and a capacitor C29;

the pins of the Ethernet interface are electrically connected with one end of a resistor R9 and one end of a resistor R10 respectively, the center tap of the network transformer is electrically connected with one end of a resistor R8 and one end of a resistor R7 respectively, the other end of the resistor R7, the other end of the resistor R8, the other end of the resistor R9 and the other end of the resistor R10 are electrically connected with one end of a capacitor C29, and the other end of the capacitor C29 is grounded.

5. The adapter for converting an ethernet interface into a CAN bus interface according to any of claims 1 to 4, wherein: the CAN communication module comprises a first CAN communication module and a second CAN communication module;

6. The adapter for converting an ethernet interface to a CAN bus interface of claim 5, wherein: the first CAN communication module also comprises a CAN controller, a CAN bus transceiver and a photoelectric isolation module;

7. The adapter for converting an ethernet interface to a CAN bus interface of claim 6, wherein: the power supply also comprises a power supply input interface;

the power input interface comprises a power interface and a reset interface;

8. The adapter for converting an ethernet interface to a CAN bus interface of claim 7, wherein: the power supply conversion module and the isolation circuit are also included;