CN220368722U - CAN bus communication circuit, CAN bus and system - Google Patents
CAN bus communication circuit, CAN bus and system Download PDFInfo
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- CN220368722U CN220368722U CN202322130205.9U CN202322130205U CN220368722U CN 220368722 U CN220368722 U CN 220368722U CN 202322130205 U CN202322130205 U CN 202322130205U CN 220368722 U CN220368722 U CN 220368722U
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Abstract
The utility model provides a CAN bus communication circuit, which comprises a CAN bus, wherein the CAN bus comprises a CANH signal line and a CANL signal line, two Bluetooth chips are respectively arranged at two ends of the CAN bus and used for receiving Bluetooth data packets and performing sub-packaging treatment, and two transceivers are respectively connected with one Bluetooth chip and then connected between the CANH signal line and the CANL signal line of the CAN bus and used for sequentially receiving and transmitting the data packets subjected to the sub-packaging treatment; the circuit carries Bluetooth into a CAN bus, and transmits signals received by the Bluetooth through the CAN bus after the signals are packetized, so that the circuit is compatible with two transmission modes of the Bluetooth and the CAN bus, and wireless transmission between equipment nodes CAN be realized through Bluetooth.
Description
Technical Field
The present utility model relates to the field of device communication technologies, and in particular, to a CAN bus communication circuit, a CAN bus, and a system.
Background
At present, in a CAN bus system, a device node and a device node CAN only communicate by physically accessing a CAN bus, as shown in fig. 1, and signal transmission between a plurality of device nodes or systems cannot be realized without physical connection.
Therefore, a method for implementing wireless transmission in a CAN bus system is needed to solve the problem of inconvenient communication between device nodes in the CAN bus system.
Disclosure of Invention
The utility model provides a CAN bus communication circuit, a CAN bus and a system, which aim to realize wireless transmission among equipment nodes by carrying Bluetooth into the CAN bus.
In a first aspect, the present utility model proposes a CAN bus communication circuit comprising:
the CAN bus comprises a CANH signal line and a CANL signal line;
the two Bluetooth chips are respectively arranged at two ends of the CAN bus and are used for receiving Bluetooth data packets and performing sub-packaging treatment;
and each transceiver is connected between the CANH signal line and the CANL signal line of the CAN bus after being respectively connected with one Bluetooth chip and is used for sequentially receiving and transmitting the data packets subjected to the subpackaging processing.
In one embodiment, the device further comprises two filter circuits, wherein each filter circuit is respectively connected between a CANH signal line and a CANL signal line which are connected with the transceiver and the CAN bus, and is used for performing filter processing on data packets transmitted through the CAN bus.
In one embodiment, the bluetooth chips include microcontrollers, each of which is connected to a transceiver through a serial peripheral interface of the microcontroller.
In one embodiment, each filter circuit comprises a first resistor, a second resistor and a filter capacitor, wherein one end of the first resistor is connected with the CANH signal line after being connected with the second resistor in series, the other end of the first resistor is connected with the CANL signal line, one end of the filter capacitor is connected with one end of the first resistor and one end of the second resistor which are connected, and the other end of the filter capacitor is grounded.
In one embodiment, the series resistance of the first resistor and the second resistor is 120 ohms.
In one embodiment, the capacitance of the filter capacitor is 4.7nF.
In one embodiment, the transceiver includes a register for storing the packetized data packets.
In one embodiment, the transceiver is further configured to detect a data transmission state of the CAN bus, and automatically enter a transmission state from a ready state for data reception when data transmission occurs.
In a second aspect, the present utility model also proposes a CAN bus comprising:
the connector is connected with the CANH signal line and the CANL signal line and is used for connecting two devices for signal communication through the CAN bus; the method comprises the steps of,
the CAN bus communication circuit of any one of the above.
In a third aspect, the present utility model also proposes a system for signal communication based on a CAN bus, comprising: the first device and the second device are in signal communication through the CAN bus, the third device and the fourth device are in signal communication through the CAN bus, and the first device and the second device are in signal communication with the third device and the fourth device through Bluetooth.
The utility model relates to a CAN bus communication circuit, which comprises a CAN bus, wherein the CAN bus comprises a CANH signal line and a CANL signal line, two Bluetooth chips are respectively arranged at two ends of the CAN bus and used for receiving Bluetooth data packets and performing sub-packaging treatment, and two transceivers are respectively connected with one Bluetooth chip and then connected between the CANH signal line and the CANL signal line of the CAN bus and used for sequentially receiving and transmitting the data packets subjected to the sub-packaging treatment; the circuit carries Bluetooth into a CAN bus, and transmits signals received by the Bluetooth through the CAN bus after the signals are packetized, so that the circuit is compatible with two transmission modes of the Bluetooth and the CAN bus, and wireless transmission between equipment nodes CAN be realized through Bluetooth.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments are briefly described below, and the drawings in the following description are only drawings corresponding to some embodiments of the present utility model.
FIG. 1 is a schematic diagram of a conventional CAN bus system according to one embodiment of the utility model;
FIG. 2 is a circuit diagram of a CAN bus communication circuit in one embodiment of the utility model;
fig. 3 is a schematic structural diagram of a system for signal communication based on a CAN bus according to one embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The terms of directions used in the present utility model, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are used for explaining and understanding the present utility model only with reference to the orientation of the drawings, and are not intended to limit the present utility model.
The words "first," "second," and the like in the terminology of the present utility model are used for descriptive purposes only and are not to be construed as indicating or implying relative importance and not as limiting the order of precedence.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 2, a CAN bus communication circuit of the present utility model, in one embodiment, includes:
CAN bus 10 including CANH signal lines and CANL signal lines;
two bluetooth chips 20 respectively arranged at two ends of the CAN bus 10 for receiving bluetooth data packets and performing packetizing processing;
and two transceivers 30, each transceiver 30 is connected between the CANH signal line and the CANL signal line of the CAN bus 10 after being connected with one bluetooth chip 20 respectively, and is used for sequentially receiving and transmitting data packets after being subjected to packetization processing.
Referring to fig. 3, the present utility model further proposes a system for signal communication based on a CAN bus, comprising: the first device and the second device are in signal communication with the third device and the fourth device through Bluetooth.
For example, when the first device needs to communicate with the third device, wireless communication is implemented through the bluetooth function in the CAN bus communication circuit, if the third device needs to transmit the bluetooth data packet to the fourth device after receiving the bluetooth data packet, the bluetooth chip 20 performs packet processing on the bluetooth data packet, and then the transceiver 30 performs transmission through the CAN bus 10, so as to implement a hybrid transmission mode of the signal communication system based on the CAN bus. The wireless transmission between the equipment nodes CAN be realized, and the data interaction between the equipment nodes in the system based on the CAN bus for signal communication is realized under the condition that the CAN bus is not required to be connected between every two equipment nodes.
The differential pressure between the CANH signal line and the CANL signal line of the CAN bus is 0V, which corresponds to signal logic 1 and is a recessive signal, and the differential pressure between the CANH signal line and the CANL signal line of the CAN bus is 2V, which corresponds to signal logic 0 and is a dominant signal.
The CAN bus transmission mode has limitation on the data length of each transmission, so when the Bluetooth data packet is transmitted through the CAN bus, the Bluetooth data packet is firstly subjected to subpackaging, specifically, a Bluetooth chip microcontroller is used for subpackaging the Bluetooth data packet, each Bluetooth chip is connected with a transceiver through a serial peripheral interface SPI of the microcontroller, and then the transceiver is used for sequentially receiving and transmitting, so that the transmission of the data packet on the CAN bus CAN be realized, and the Bluetooth and CAN bus transmission modes are compatible.
In one embodiment, the transceiver 30 includes a register for storing the packetized data packets, and the packetized data packets are sequentially stored in the register and sequentially read from the register for transmission or reception by the transceiver 30.
In one embodiment, the transceiver 30 is further configured to detect a data transmission state of the CAN bus 10, and automatically enter a transmission state from a ready state for data reception when data transmission occurs.
In one embodiment, the CAN bus communication circuit further includes two filter circuits 40, each filter circuit 40 is respectively connected between a CANH signal line and a CANL signal line connected to the transceiver 30 and the CAN bus 10, and is used for performing filtering processing on a data packet transmitted through the CAN bus 10.
In one embodiment, each filter circuit comprises a first resistor, a second resistor and a filter capacitor, wherein one end of the first resistor is connected with the CANH signal line after being connected with the second resistor in series, the other end of the first resistor is connected with the CANL signal line, one end of the filter capacitor is connected with one end of the first resistor and one end of the second resistor which are connected, and the other end of the filter capacitor is grounded.
Preferably, the series resistance of the first resistor and the second resistor is 120 ohms. This parameter is only a preferred embodiment and is not limiting of this embodiment.
Preferably, the capacitance value of the filter capacitor is 4.7nF. This parameter is only a preferred embodiment and is not limiting of this embodiment.
The filter circuit 40 can eliminate signal reflection and suppress interference, and the capacitor has the functions of improving the signal transmission speed and filtering noise to improve the stability of the signal.
According to the CAN bus communication circuit provided by the embodiment of the utility model, bluetooth is carried into the CAN bus, so that wireless transmission between system equipment nodes which are in signal communication based on the CAN bus is realized, the number of the CAN buses connected between the equipment nodes is reduced, and the signal communication between the nodes is simplified and simplified.
The embodiment of the utility model also provides a CAN bus, which comprises the following components: the connector is connected with the CANH signal line and the CANL signal line and is used for connecting two devices for signal communication through the CAN bus; and the CAN bus communication circuit according to any one of the above embodiments.
In summary, although the present utility model has been described with reference to the preferred embodiments, the scope of the utility model is not limited thereto, and any person skilled in the art who is skilled in the art should make equivalent substitutions or modifications according to the technical scheme of the present utility model within the scope of the present utility model.
Claims (10)
1. A CAN bus communication circuit, comprising:
the CAN bus comprises a CANH signal line and a CANL signal line;
the two Bluetooth chips are respectively arranged at two ends of the CAN bus and are used for receiving Bluetooth data packets and performing sub-packaging treatment;
and each transceiver is connected between the CANH signal line and the CANL signal line of the CAN bus after being respectively connected with one Bluetooth chip and is used for sequentially receiving and transmitting the data packets subjected to the subpackaging processing.
2. The CAN bus communication circuit of claim 1 further comprising two filter circuits, each filter circuit being connected between a CANH signal line and a CANL signal line of the transceiver connected to the CAN bus, respectively, for filtering data packets transmitted via the CAN bus.
3. The CAN bus communication circuit of claim 1, wherein the bluetooth chips comprise microcontrollers, each bluetooth chip being connected to a transceiver through a serial peripheral interface of the microcontroller.
4. The CAN bus communication circuit of claim 2, wherein each filter circuit includes a first resistor, a second resistor, and a filter capacitor, the first resistor is connected in series with the second resistor, and then connected at one end to the CANH signal line, and connected at the other end to the CANL signal line, and the filter capacitor is connected at one end to one end of the connection of the first resistor and the second resistor, and grounded at the other end.
5. The CAN bus communication circuit of claim 4, wherein the series resistance of the first resistor and the second resistor is 120 ohms.
6. The CAN bus communication circuit of claim 4, wherein the filter capacitor has a capacitance of 4.7nF.
7. The CAN bus communication circuit of claim 1, wherein the transceiver includes a register for storing the packetized data packets.
8. The CAN bus communication circuit of claim 1 wherein the transceiver is further configured to detect a data transfer state of the CAN bus, and automatically enter a transfer state from a ready state for data reception when a data transfer occurs.
9. A CAN bus, comprising:
the connector is connected with the CANH signal line and the CANL signal line and is used for connecting two devices for signal communication through the CAN bus; the method comprises the steps of,
the CAN bus communication circuit of any one of claims 1-8.
10. A system for signal communication based on a CAN bus, comprising: first equipment, second equipment, third equipment and fourth equipment based on CAN bus signal communication, first equipment and second equipment are through the CAN bus of claim 9 signal communication, third equipment and fourth equipment are through the CAN bus of claim 9 signal communication, signal communication is carried out between first equipment and second equipment and third equipment and fourth equipment through bluetooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322130205.9U CN220368722U (en) | 2023-08-08 | 2023-08-08 | CAN bus communication circuit, CAN bus and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322130205.9U CN220368722U (en) | 2023-08-08 | 2023-08-08 | CAN bus communication circuit, CAN bus and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220368722U true CN220368722U (en) | 2024-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322130205.9U Active CN220368722U (en) | 2023-08-08 | 2023-08-08 | CAN bus communication circuit, CAN bus and system |
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| Country | Link |
|---|---|
| CN (1) | CN220368722U (en) |
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2023
- 2023-08-08 CN CN202322130205.9U patent/CN220368722U/en active Active
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